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-rw-r--r--fs/ext4/Makefile2
-rw-r--r--fs/ext4/balloc.c247
-rw-r--r--fs/ext4/dir.c14
-rw-r--r--fs/ext4/extents.c481
-rw-r--r--fs/ext4/file.c23
-rw-r--r--fs/ext4/group.h8
-rw-r--r--fs/ext4/ialloc.c141
-rw-r--r--fs/ext4/inode.c360
-rw-r--r--fs/ext4/ioctl.c7
-rw-r--r--fs/ext4/mballoc.c4552
-rw-r--r--fs/ext4/migrate.c560
-rw-r--r--fs/ext4/namei.c135
-rw-r--r--fs/ext4/resize.c28
-rw-r--r--fs/ext4/super.c379
-rw-r--r--fs/ext4/xattr.c4
15 files changed, 6313 insertions, 628 deletions
diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile
index ae6e7e502ac..ac6fa8ca0a2 100644
--- a/fs/ext4/Makefile
+++ b/fs/ext4/Makefile
@@ -6,7 +6,7 @@ obj-$(CONFIG_EXT4DEV_FS) += ext4dev.o
ext4dev-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
- ext4_jbd2.o
+ ext4_jbd2.o migrate.o mballoc.o
ext4dev-$(CONFIG_EXT4DEV_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
ext4dev-$(CONFIG_EXT4DEV_FS_POSIX_ACL) += acl.o
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 71ee95e534f..ac75ea953d8 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -29,7 +29,7 @@
* Calculate the block group number and offset, given a block number
*/
void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
- unsigned long *blockgrpp, ext4_grpblk_t *offsetp)
+ ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp)
{
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ext4_grpblk_t offset;
@@ -46,7 +46,7 @@ void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
/* Initializes an uninitialized block bitmap if given, and returns the
* number of blocks free in the group. */
unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
- int block_group, struct ext4_group_desc *gdp)
+ ext4_group_t block_group, struct ext4_group_desc *gdp)
{
unsigned long start;
int bit, bit_max;
@@ -60,7 +60,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
* essentially implementing a per-group read-only flag. */
if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) {
ext4_error(sb, __FUNCTION__,
- "Checksum bad for group %u\n", block_group);
+ "Checksum bad for group %lu\n", block_group);
gdp->bg_free_blocks_count = 0;
gdp->bg_free_inodes_count = 0;
gdp->bg_itable_unused = 0;
@@ -153,7 +153,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
* group descriptor
*/
struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
- unsigned int block_group,
+ ext4_group_t block_group,
struct buffer_head ** bh)
{
unsigned long group_desc;
@@ -164,7 +164,7 @@ struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
if (block_group >= sbi->s_groups_count) {
ext4_error (sb, "ext4_get_group_desc",
"block_group >= groups_count - "
- "block_group = %d, groups_count = %lu",
+ "block_group = %lu, groups_count = %lu",
block_group, sbi->s_groups_count);
return NULL;
@@ -176,7 +176,7 @@ struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
if (!sbi->s_group_desc[group_desc]) {
ext4_error (sb, "ext4_get_group_desc",
"Group descriptor not loaded - "
- "block_group = %d, group_desc = %lu, desc = %lu",
+ "block_group = %lu, group_desc = %lu, desc = %lu",
block_group, group_desc, offset);
return NULL;
}
@@ -189,18 +189,70 @@ struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
return desc;
}
+static int ext4_valid_block_bitmap(struct super_block *sb,
+ struct ext4_group_desc *desc,
+ unsigned int block_group,
+ struct buffer_head *bh)
+{
+ ext4_grpblk_t offset;
+ ext4_grpblk_t next_zero_bit;
+ ext4_fsblk_t bitmap_blk;
+ ext4_fsblk_t group_first_block;
+
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
+ /* with FLEX_BG, the inode/block bitmaps and itable
+ * blocks may not be in the group at all
+ * so the bitmap validation will be skipped for those groups
+ * or it has to also read the block group where the bitmaps
+ * are located to verify they are set.
+ */
+ return 1;
+ }
+ group_first_block = ext4_group_first_block_no(sb, block_group);
+
+ /* check whether block bitmap block number is set */
+ bitmap_blk = ext4_block_bitmap(sb, desc);
+ offset = bitmap_blk - group_first_block;
+ if (!ext4_test_bit(offset, bh->b_data))
+ /* bad block bitmap */
+ goto err_out;
+
+ /* check whether the inode bitmap block number is set */
+ bitmap_blk = ext4_inode_bitmap(sb, desc);
+ offset = bitmap_blk - group_first_block;
+ if (!ext4_test_bit(offset, bh->b_data))
+ /* bad block bitmap */
+ goto err_out;
+
+ /* check whether the inode table block number is set */
+ bitmap_blk = ext4_inode_table(sb, desc);
+ offset = bitmap_blk - group_first_block;
+ next_zero_bit = ext4_find_next_zero_bit(bh->b_data,
+ offset + EXT4_SB(sb)->s_itb_per_group,
+ offset);
+ if (next_zero_bit >= offset + EXT4_SB(sb)->s_itb_per_group)
+ /* good bitmap for inode tables */
+ return 1;
+
+err_out:
+ ext4_error(sb, __FUNCTION__,
+ "Invalid block bitmap - "
+ "block_group = %d, block = %llu",
+ block_group, bitmap_blk);
+ return 0;
+}
/**
* read_block_bitmap()
* @sb: super block
* @block_group: given block group
*
- * Read the bitmap for a given block_group, reading into the specified
- * slot in the superblock's bitmap cache.
+ * Read the bitmap for a given block_group,and validate the
+ * bits for block/inode/inode tables are set in the bitmaps
*
* Return buffer_head on success or NULL in case of failure.
*/
struct buffer_head *
-read_block_bitmap(struct super_block *sb, unsigned int block_group)
+read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
{
struct ext4_group_desc * desc;
struct buffer_head * bh = NULL;
@@ -210,25 +262,36 @@ read_block_bitmap(struct super_block *sb, unsigned int block_group)
if (!desc)
return NULL;
bitmap_blk = ext4_block_bitmap(sb, desc);
+ bh = sb_getblk(sb, bitmap_blk);
+ if (unlikely(!bh)) {
+ ext4_error(sb, __FUNCTION__,
+ "Cannot read block bitmap - "
+ "block_group = %d, block_bitmap = %llu",
+ (int)block_group, (unsigned long long)bitmap_blk);
+ return NULL;
+ }
+ if (bh_uptodate_or_lock(bh))
+ return bh;
+
if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
- bh = sb_getblk(sb, bitmap_blk);
- if (!buffer_uptodate(bh)) {
- lock_buffer(bh);
- if (!buffer_uptodate(bh)) {
- ext4_init_block_bitmap(sb, bh, block_group,
- desc);
- set_buffer_uptodate(bh);
- }
- unlock_buffer(bh);
- }
- } else {
- bh = sb_bread(sb, bitmap_blk);
+ ext4_init_block_bitmap(sb, bh, block_group, desc);
+ set_buffer_uptodate(bh);
+ unlock_buffer(bh);
+ return bh;
}
- if (!bh)
- ext4_error (sb, __FUNCTION__,
+ if (bh_submit_read(bh) < 0) {
+ put_bh(bh);
+ ext4_error(sb, __FUNCTION__,
"Cannot read block bitmap - "
"block_group = %d, block_bitmap = %llu",
- block_group, bitmap_blk);
+ (int)block_group, (unsigned long long)bitmap_blk);
+ return NULL;
+ }
+ if (!ext4_valid_block_bitmap(sb, desc, block_group, bh)) {
+ put_bh(bh);
+ return NULL;
+ }
+
return bh;
}
/*
@@ -320,7 +383,7 @@ restart:
*/
static int
goal_in_my_reservation(struct ext4_reserve_window *rsv, ext4_grpblk_t grp_goal,
- unsigned int group, struct super_block * sb)
+ ext4_group_t group, struct super_block *sb)
{
ext4_fsblk_t group_first_block, group_last_block;
@@ -463,7 +526,7 @@ static inline int rsv_is_empty(struct ext4_reserve_window *rsv)
* when setting the reservation window size through ioctl before the file
* is open for write (needs block allocation).
*
- * Needs truncate_mutex protection prior to call this function.
+ * Needs down_write(i_data_sem) protection prior to call this function.
*/
void ext4_init_block_alloc_info(struct inode *inode)
{
@@ -514,6 +577,8 @@ void ext4_discard_reservation(struct inode *inode)
struct ext4_reserve_window_node *rsv;
spinlock_t *rsv_lock = &EXT4_SB(inode->i_sb)->s_rsv_window_lock;
+ ext4_mb_discard_inode_preallocations(inode);
+
if (!block_i)
return;
@@ -540,7 +605,7 @@ void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
{
struct buffer_head *bitmap_bh = NULL;
struct buffer_head *gd_bh;
- unsigned long block_group;
+ ext4_group_t block_group;
ext4_grpblk_t bit;
unsigned long i;
unsigned long overflow;
@@ -587,11 +652,13 @@ do_more:
in_range(ext4_inode_bitmap(sb, desc), block, count) ||
in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) ||
in_range(block + count - 1, ext4_inode_table(sb, desc),
- sbi->s_itb_per_group))
+ sbi->s_itb_per_group)) {
ext4_error (sb, "ext4_free_blocks",
"Freeing blocks in system zones - "
"Block = %llu, count = %lu",
block, count);
+ goto error_return;
+ }
/*
* We are about to start releasing blocks in the bitmap,
@@ -720,19 +787,29 @@ error_return:
* @inode: inode
* @block: start physical block to free
* @count: number of blocks to count
+ * @metadata: Are these metadata blocks
*/
void ext4_free_blocks(handle_t *handle, struct inode *inode,
- ext4_fsblk_t block, unsigned long count)
+ ext4_fsblk_t block, unsigned long count,
+ int metadata)
{
struct super_block * sb;
unsigned long dquot_freed_blocks;
+ /* this isn't the right place to decide whether block is metadata
+ * inode.c/extents.c knows better, but for safety ... */
+ if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode) ||
+ ext4_should_journal_data(inode))
+ metadata = 1;
+
sb = inode->i_sb;
- if (!sb) {
- printk ("ext4_free_blocks: nonexistent device");
- return;
- }
- ext4_free_blocks_sb(handle, sb, block, count, &dquot_freed_blocks);
+
+ if (!test_opt(sb, MBALLOC) || !EXT4_SB(sb)->s_group_info)
+ ext4_free_blocks_sb(handle, sb, block, count,
+ &dquot_freed_blocks);
+ else
+ ext4_mb_free_blocks(handle, inode, block, count,
+ metadata, &dquot_freed_blocks);
if (dquot_freed_blocks)
DQUOT_FREE_BLOCK(inode, dquot_freed_blocks);
return;
@@ -920,9 +997,10 @@ claim_block(spinlock_t *lock, ext4_grpblk_t block, struct buffer_head *bh)
* ext4_journal_release_buffer(), else we'll run out of credits.
*/
static ext4_grpblk_t
-ext4_try_to_allocate(struct super_block *sb, handle_t *handle, int group,
- struct buffer_head *bitmap_bh, ext4_grpblk_t grp_goal,
- unsigned long *count, struct ext4_reserve_window *my_rsv)
+ext4_try_to_allocate(struct super_block *sb, handle_t *handle,
+ ext4_group_t group, struct buffer_head *bitmap_bh,
+ ext4_grpblk_t grp_goal, unsigned long *count,
+ struct ext4_reserve_window *my_rsv)
{
ext4_fsblk_t group_first_block;
ext4_grpblk_t start, end;
@@ -1156,7 +1234,7 @@ static int find_next_reservable_window(
*/
static int alloc_new_reservation(struct ext4_reserve_window_node *my_rsv,
ext4_grpblk_t grp_goal, struct super_block *sb,
- unsigned int group, struct buffer_head *bitmap_bh)
+ ext4_group_t group, struct buffer_head *bitmap_bh)
{
struct ext4_reserve_window_node *search_head;
ext4_fsblk_t group_first_block, group_end_block, start_block;
@@ -1354,7 +1432,7 @@ static void try_to_extend_reservation(struct ext4_reserve_window_node *my_rsv,
*/
static ext4_grpblk_t
ext4_try_to_allocate_with_rsv(struct super_block *sb, handle_t *handle,
- unsigned int group, struct buffer_head *bitmap_bh,
+ ext4_group_t group, struct buffer_head *bitmap_bh,
ext4_grpblk_t grp_goal,
struct ext4_reserve_window_node * my_rsv,
unsigned long *count, int *errp)
@@ -1510,7 +1588,7 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
}
/**
- * ext4_new_blocks() -- core block(s) allocation function
+ * ext4_new_blocks_old() -- core block(s) allocation function
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
@@ -1523,17 +1601,17 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
* any specific goal block.
*
*/
-ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
+ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp)
{
struct buffer_head *bitmap_bh = NULL;
struct buffer_head *gdp_bh;
- unsigned long group_no;
- int goal_group;
+ ext4_group_t group_no;
+ ext4_group_t goal_group;
ext4_grpblk_t grp_target_blk; /* blockgroup relative goal block */
ext4_grpblk_t grp_alloc_blk; /* blockgroup-relative allocated block*/
ext4_fsblk_t ret_block; /* filesyetem-wide allocated block */
- int bgi; /* blockgroup iteration index */
+ ext4_group_t bgi; /* blockgroup iteration index */
int fatal = 0, err;
int performed_allocation = 0;
ext4_grpblk_t free_blocks; /* number of free blocks in a group */
@@ -1544,10 +1622,7 @@ ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
struct ext4_reserve_window_node *my_rsv = NULL;
struct ext4_block_alloc_info *block_i;
unsigned short windowsz = 0;
-#ifdef EXT4FS_DEBUG
- static int goal_hits, goal_attempts;
-#endif
- unsigned long ngroups;
+ ext4_group_t ngroups;
unsigned long num = *count;
*errp = -ENOSPC;
@@ -1567,7 +1642,7 @@ ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
sbi = EXT4_SB(sb);
es = EXT4_SB(sb)->s_es;
- ext4_debug("goal=%lu.\n", goal);
+ ext4_debug("goal=%llu.\n", goal);
/*
* Allocate a block from reservation only when
* filesystem is mounted with reservation(default,-o reservation), and
@@ -1677,7 +1752,7 @@ retry_alloc:
allocated:
- ext4_debug("using block group %d(%d)\n",
+ ext4_debug("using block group %lu(%d)\n",
group_no, gdp->bg_free_blocks_count);
BUFFER_TRACE(gdp_bh, "get_write_access");
@@ -1692,11 +1767,13 @@ allocated:
in_range(ret_block, ext4_inode_table(sb, gdp),
EXT4_SB(sb)->s_itb_per_group) ||
in_range(ret_block + num - 1, ext4_inode_table(sb, gdp),
- EXT4_SB(sb)->s_itb_per_group))
+ EXT4_SB(sb)->s_itb_per_group)) {
ext4_error(sb, "ext4_new_block",
"Allocating block in system zone - "
"blocks from %llu, length %lu",
ret_block, num);
+ goto out;
+ }
performed_allocation = 1;
@@ -1743,9 +1820,6 @@ allocated:
* list of some description. We don't know in advance whether
* the caller wants to use it as metadata or data.
*/
- ext4_debug("allocating block %lu. Goal hits %d of %d.\n",
- ret_block, goal_hits, goal_attempts);
-
spin_lock(sb_bgl_lock(sbi, group_no));
if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))
gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
@@ -1787,13 +1861,46 @@ out:
}
ext4_fsblk_t ext4_new_block(handle_t *handle, struct inode *inode,
- ext4_fsblk_t goal, int *errp)
+ ext4_fsblk_t goal, int *errp)
{
- unsigned long count = 1;
+ struct ext4_allocation_request ar;
+ ext4_fsblk_t ret;
- return ext4_new_blocks(handle, inode, goal, &count, errp);
+ if (!test_opt(inode->i_sb, MBALLOC)) {
+ unsigned long count = 1;
+ ret = ext4_new_blocks_old(handle, inode, goal, &count, errp);
+ return ret;
+ }
+
+ memset(&ar, 0, sizeof(ar));
+ ar.inode = inode;
+ ar.goal = goal;
+ ar.len = 1;
+ ret = ext4_mb_new_blocks(handle, &ar, errp);
+ return ret;
+}
+
+ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t goal, unsigned long *count, int *errp)
+{
+ struct ext4_allocation_request ar;
+ ext4_fsblk_t ret;
+
+ if (!test_opt(inode->i_sb, MBALLOC)) {
+ ret = ext4_new_blocks_old(handle, inode, goal, count, errp);
+ return ret;
+ }
+
+ memset(&ar, 0, sizeof(ar));
+ ar.inode = inode;
+ ar.goal = goal;
+ ar.len = *count;
+ ret = ext4_mb_new_blocks(handle, &ar, errp);
+ *count = ar.len;
+ return ret;
}
+
/**
* ext4_count_free_blocks() -- count filesystem free blocks
* @sb: superblock
@@ -1804,8 +1911,8 @@ ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb)
{
ext4_fsblk_t desc_count;
struct ext4_group_desc *gdp;
- int i;
- unsigned long ngroups = EXT4_SB(sb)->s_groups_count;
+ ext4_group_t i;
+ ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
#ifdef EXT4FS_DEBUG
struct ext4_super_block *es;
ext4_fsblk_t bitmap_count;
@@ -1829,14 +1936,14 @@ ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb)
continue;
x = ext4_count_free(bitmap_bh, sb->s_blocksize);
- printk("group %d: stored = %d, counted = %lu\n",
+ printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n",
i, le16_to_cpu(gdp->bg_free_blocks_count), x);
bitmap_count += x;
}
brelse(bitmap_bh);
printk("ext4_count_free_blocks: stored = %llu"
", computed = %llu, %llu\n",
- EXT4_FREE_BLOCKS_COUNT(es),
+ ext4_free_blocks_count(es),
desc_count, bitmap_count);
return bitmap_count;
#else
@@ -1853,7 +1960,7 @@ ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb)
#endif
}
-static inline int test_root(int a, int b)
+static inline int test_root(ext4_group_t a, int b)
{
int num = b;
@@ -1862,7 +1969,7 @@ static inline int test_root(int a, int b)
return num == a;
}
-static int ext4_group_sparse(int group)
+static int ext4_group_sparse(ext4_group_t group)
{
if (group <= 1)
return 1;
@@ -1880,7 +1987,7 @@ static int ext4_group_sparse(int group)
* Return the number of blocks used by the superblock (primary or backup)
* in this group. Currently this will be only 0 or 1.
*/
-int ext4_bg_has_super(struct super_block *sb, int group)
+int ext4_bg_has_super(struct super_block *sb, ext4_group_t group)
{
if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER) &&
@@ -1889,18 +1996,20 @@ int ext4_bg_has_super(struct super_block *sb, int group)
return 1;
}
-static unsigned long ext4_bg_num_gdb_meta(struct super_block *sb, int group)
+static unsigned long ext4_bg_num_gdb_meta(struct super_block *sb,
+ ext4_group_t group)
{
unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb);
- unsigned long first = metagroup * EXT4_DESC_PER_BLOCK(sb);
- unsigned long last = first + EXT4_DESC_PER_BLOCK(sb) - 1;
+ ext4_group_t first = metagroup * EXT4_DESC_PER_BLOCK(sb);
+ ext4_group_t last = first + EXT4_DESC_PER_BLOCK(sb) - 1;
if (group == first || group == first + 1 || group == last)
return 1;
return 0;
}
-static unsigned long ext4_bg_num_gdb_nometa(struct super_block *sb, int group)
+static unsigned long ext4_bg_num_gdb_nometa(struct super_block *sb,
+ ext4_group_t group)
{
if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER) &&
@@ -1918,7 +2027,7 @@ static unsigned long ext4_bg_num_gdb_nometa(struct super_block *sb, int group)
* (primary or backup) in this group. In the future there may be a
* different number of descriptor blocks in each group.
*/
-unsigned long ext4_bg_num_gdb(struct super_block *sb, int group)
+unsigned long ext4_bg_num_gdb(struct super_block *sb, ext4_group_t group)
{
unsigned long first_meta_bg =
le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg);
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index f612bef9831..33888bb5814 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -67,7 +67,7 @@ int ext4_check_dir_entry (const char * function, struct inode * dir,
unsigned long offset)
{
const char * error_msg = NULL;
- const int rlen = le16_to_cpu(de->rec_len);
+ const int rlen = ext4_rec_len_from_disk(de->rec_len);
if (rlen < EXT4_DIR_REC_LEN(1))
error_msg = "rec_len is smaller than minimal";
@@ -124,7 +124,7 @@ static int ext4_readdir(struct file * filp,
offset = filp->f_pos & (sb->s_blocksize - 1);
while (!error && !stored && filp->f_pos < inode->i_size) {
- unsigned long blk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb);
+ ext4_lblk_t blk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb);
struct buffer_head map_bh;
struct buffer_head *bh = NULL;
@@ -172,10 +172,10 @@ revalidate:
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
- if (le16_to_cpu(de->rec_len) <
- EXT4_DIR_REC_LEN(1))
+ if (ext4_rec_len_from_disk(de->rec_len)
+ < EXT4_DIR_REC_LEN(1))
break;
- i += le16_to_cpu(de->rec_len);
+ i += ext4_rec_len_from_disk(de->rec_len);
}
offset = i;
filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
@@ -197,7 +197,7 @@ revalidate:
ret = stored;
goto out;
}
- offset += le16_to_cpu(de->rec_len);
+ offset += ext4_rec_len_from_disk(de->rec_len);
if (le32_to_cpu(de->inode)) {
/* We might block in the next section
* if the data destination is
@@ -219,7 +219,7 @@ revalidate:
goto revalidate;
stored ++;
}
- filp->f_pos += le16_to_cpu(de->rec_len);
+ filp->f_pos += ext4_rec_len_from_disk(de->rec_len);
}
offset = 0;
brelse (bh);
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 85287742f2a..bc7081f1fbe 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -61,7 +61,7 @@ static ext4_fsblk_t ext_pblock(struct ext4_extent *ex)
* idx_pblock:
* combine low and high parts of a leaf physical block number into ext4_fsblk_t
*/
-static ext4_fsblk_t idx_pblock(struct ext4_extent_idx *ix)
+ext4_fsblk_t idx_pblock(struct ext4_extent_idx *ix)
{
ext4_fsblk_t block;
@@ -75,7 +75,7 @@ static ext4_fsblk_t idx_pblock(struct ext4_extent_idx *ix)
* stores a large physical block number into an extent struct,
* breaking it into parts
*/
-static void ext4_ext_store_pblock(struct ext4_extent *ex, ext4_fsblk_t pb)
+void ext4_ext_store_pblock(struct ext4_extent *ex, ext4_fsblk_t pb)
{
ex->ee_start_lo = cpu_to_le32((unsigned long) (pb & 0xffffffff));
ex->ee_start_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
@@ -144,7 +144,7 @@ static int ext4_ext_dirty(handle_t *handle, struct inode *inode,
static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
struct ext4_ext_path *path,
- ext4_fsblk_t block)
+ ext4_lblk_t block)
{
struct ext4_inode_info *ei = EXT4_I(inode);
ext4_fsblk_t bg_start;
@@ -367,13 +367,14 @@ static void ext4_ext_drop_refs(struct ext4_ext_path *path)
* the header must be checked before calling this
*/
static void
-ext4_ext_binsearch_idx(struct inode *inode, struct ext4_ext_path *path, int block)
+ext4_ext_binsearch_idx(struct inode *inode,
+ struct ext4_ext_path *path, ext4_lblk_t block)
{
struct ext4_extent_header *eh = path->p_hdr;
struct ext4_extent_idx *r, *l, *m;
- ext_debug("binsearch for %d(idx): ", block);
+ ext_debug("binsearch for %u(idx): ", block);
l = EXT_FIRST_INDEX(eh) + 1;
r = EXT_LAST_INDEX(eh);
@@ -425,7 +426,8 @@ ext4_ext_binsearch_idx(struct inode *inode, struct ext4_ext_path *path, int bloc
* the header must be checked before calling this
*/
static void
-ext4_ext_binsearch(struct inode *inode, struct ext4_ext_path *path, int block)
+ext4_ext_binsearch(struct inode *inode,
+ struct ext4_ext_path *path, ext4_lblk_t block)
{
struct ext4_extent_header *eh = path->p_hdr;
struct ext4_extent *r, *l, *m;
@@ -438,7 +440,7 @@ ext4_ext_binsearch(struct inode *inode, struct ext4_ext_path *path, int block)
return;
}
- ext_debug("binsearch for %d: ", block);
+ ext_debug("binsearch for %u: ", block);
l = EXT_FIRST_EXTENT(eh) + 1;
r = EXT_LAST_EXTENT(eh);
@@ -494,7 +496,8 @@ int ext4_ext_tree_init(handle_t *handle, struct inode *inode)
}
struct ext4_ext_path *
-ext4_ext_find_extent(struct inode *inode, int block, struct ext4_ext_path *path)
+ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
+ struct ext4_ext_path *path)
{
struct ext4_extent_header *eh;
struct buffer_head *bh;
@@ -763,7 +766,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
while (k--) {
oldblock = newblock;
newblock = ablocks[--a];
- bh = sb_getblk(inode->i_sb, (ext4_fsblk_t)newblock);
+ bh = sb_getblk(inode->i_sb, newblock);
if (!bh) {
err = -EIO;
goto cleanup;
@@ -783,9 +786,8 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
fidx->ei_block = border;
ext4_idx_store_pblock(fidx, oldblock);
- ext_debug("int.index at %d (block %llu): %lu -> %llu\n", i,
- newblock, (unsigned long) le32_to_cpu(border),
- oldblock);
+ ext_debug("int.index at %d (block %llu): %u -> %llu\n",
+ i, newblock, le32_to_cpu(border), oldblock);
/* copy indexes */
m = 0;
path[i].p_idx++;
@@ -851,7 +853,7 @@ cleanup:
for (i = 0; i < depth; i++) {
if (!ablocks[i])
continue;
- ext4_free_blocks(handle, inode, ablocks[i], 1);
+ ext4_free_blocks(handle, inode, ablocks[i], 1, 1);
}
}
kfree(ablocks);
@@ -979,8 +981,8 @@ repeat:
/* refill path */
ext4_ext_drop_refs(path);
path = ext4_ext_find_extent(inode,
- le32_to_cpu(newext->ee_block),
- path);
+ (ext4_lblk_t)le32_to_cpu(newext->ee_block),
+ path);
if (IS_ERR(path))
err = PTR_ERR(path);
} else {
@@ -992,8 +994,8 @@ repeat:
/* refill path */
ext4_ext_drop_refs(path);
path = ext4_ext_find_extent(inode,
- le32_to_cpu(newext->ee_block),
- path);
+ (ext4_lblk_t)le32_to_cpu(newext->ee_block),
+ path);
if (IS_ERR(path)) {
err = PTR_ERR(path);
goto out;
@@ -1015,13 +1017,157 @@ out:
}
/*
+ * search the closest allocated block to the left for *logical
+ * and returns it at @logical + it's physical address at @phys
+ * if *logical is the smallest allocated block, the function
+ * returns 0 at @phys
+ * return value contains 0 (success) or error code
+ */
+int
+ext4_ext_search_left(struct inode *inode, struct ext4_ext_path *path,
+ ext4_lblk_t *logical, ext4_fsblk_t *phys)
+{
+ struct ext4_extent_idx *ix;
+ struct ext4_extent *ex;
+ int depth, ee_len;
+
+ BUG_ON(path == NULL);
+ depth = path->p_depth;
+ *phys = 0;
+
+ if (depth == 0 && path->p_ext == NULL)
+ return 0;
+
+ /* usually extent in the path covers blocks smaller
+ * then *logical, but it can be that extent is the
+ * first one in the file */
+
+ ex = path[depth].p_ext;
+ ee_len = ext4_ext_get_actual_len(ex);
+ if (*logical < le32_to_cpu(ex->ee_block)) {
+ BUG_ON(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex);
+ while (--depth >= 0) {
+ ix = path[depth].p_idx;
+ BUG_ON(ix != EXT_FIRST_INDEX(path[depth].p_hdr));
+ }
+ return 0;
+ }
+
+ BUG_ON(*logical < (le32_to_cpu(ex->ee_block) + ee_len));
+
+ *logical = le32_to_cpu(ex->ee_block) + ee_len - 1;
+ *phys = ext_pblock(ex) + ee_len - 1;
+ return 0;
+}
+
+/*
+ * search the closest allocated block to the right for *logical
+ * and returns it at @logical + it's physical address at @phys
+ * if *logical is the smallest allocated block, the function
+ * returns 0 at @phys
+ * return value contains 0 (success) or error code
+ */
+int
+ext4_ext_search_right(struct inode *inode, struct ext4_ext_path *path,
+ ext4_lblk_t *logical, ext4_fsblk_t *phys)
+{
+ struct buffer_head *bh = NULL;
+ struct ext4_extent_header *eh;
+ struct ext4_extent_idx *ix;
+ struct ext4_extent *ex;
+ ext4_fsblk_t block;
+ int depth, ee_len;
+
+ BUG_ON(path == NULL);
+ depth = path->p_depth;
+ *phys = 0;
+
+ if (depth == 0 && path->p_ext == NULL)
+ return 0;
+
+ /* usually extent in the path covers blocks smaller
+ * then *logical, but it can be that extent is the
+ * first one in the file */
+
+ ex = path[depth].p_ext;
+ ee_len = ext4_ext_get_actual_len(ex);
+ if (*logical < le32_to_cpu(ex->ee_block)) {
+ BUG_ON(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex);
+ while (--depth >= 0) {
+ ix = path[depth].p_idx;
+ BUG_ON(ix != EXT_FIRST_INDEX(path[depth].p_hdr));
+ }
+ *logical = le32_to_cpu(ex->ee_block);
+ *phys = ext_pblock(ex);
+ return 0;
+ }
+
+ BUG_ON(*logical < (le32_to_cpu(ex->ee_block) + ee_len));
+
+ if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) {
+ /* next allocated block in this leaf */
+ ex++;
+ *logical = le32_to_cpu(ex->ee_block);
+ *phys = ext_pblock(ex);
+ return 0;
+ }
+
+ /* go up and search for index to the right */
+ while (--depth >= 0) {
+ ix = path[depth].p_idx;
+ if (ix != EXT_LAST_INDEX(path[depth].p_hdr))
+ break;
+ }
+
+ if (depth < 0) {
+ /* we've gone up to the root and
+ * found no index to the right */
+ return 0;
+ }
+
+ /* we've found index to the right, let's
+ * follow it and find the closest allocated
+ * block to the right */
+ ix++;
+ block = idx_pblock(ix);
+ while (++depth < path->p_depth) {
+ bh = sb_bread(inode->i_sb, block);
+ if (bh == NULL)
+ return -EIO;
+ eh = ext_block_hdr(bh);
+ if (ext4_ext_check_header(inode, eh, depth)) {
+ put_bh(bh);
+ return -EIO;
+ }
+ ix = EXT_FIRST_INDEX(eh);
+ block = idx_pblock(ix);
+ put_bh(bh);
+ }
+
+ bh = sb_bread(inode->i_sb, block);
+ if (bh == NULL)
+ return -EIO;
+ eh = ext_block_hdr(bh);
+ if (ext4_ext_check_header(inode, eh, path->p_depth - depth)) {
+ put_bh(bh);
+ return -EIO;
+ }
+ ex = EXT_FIRST_EXTENT(eh);
+ *logical = le32_to_cpu(ex->ee_block);
+ *phys = ext_pblock(ex);
+ put_bh(bh);
+ return 0;
+
+}
+
+/*
* ext4_ext_next_allocated_block:
* returns allocated block in subsequent extent or EXT_MAX_BLOCK.
* NOTE: it considers block number from index entry as
* allocated block. Thus, index entries have to be consistent
* with leaves.
*/
-static unsigned long
+static ext4_lblk_t
ext4_ext_next_allocated_block(struct ext4_ext_path *path)
{
int depth;
@@ -1054,7 +1200,7 @@ ext4_ext_next_allocated_block(struct ext4_ext_path *path)
* ext4_ext_next_leaf_block:
* returns first allocated block from next leaf or EXT_MAX_BLOCK
*/
-static unsigned ext4_ext_next_leaf_block(struct inode *inode,
+static ext4_lblk_t ext4_ext_next_leaf_block(struct inode *inode,
struct ext4_ext_path *path)
{
int depth;
@@ -1072,7 +1218,8 @@ static unsigned ext4_ext_next_leaf_block(struct inode *inode,
while (depth >= 0) {
if (path[depth].p_idx !=
EXT_LAST_INDEX(path[depth].p_hdr))
- return le32_to_cpu(path[depth].p_idx[1].ei_block);
+ return (ext4_lblk_t)
+ le32_to_cpu(path[depth].p_idx[1].ei_block);
depth--;
}
@@ -1085,7 +1232,7 @@ static unsigned ext4_ext_next_leaf_block(struct inode *inode,
* then we have to correct all indexes above.
* TODO: do we need to correct tree in all cases?
*/
-int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode,
+static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path)
{
struct ext4_extent_header *eh;
@@ -1171,7 +1318,7 @@ ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1,
if (ext1_ee_len + ext2_ee_len > max_len)
return 0;
#ifdef AGGRESSIVE_TEST
- if (le16_to_cpu(ex1->ee_len) >= 4)
+ if (ext1_ee_len >= 4)
return 0;
#endif
@@ -1239,7 +1386,7 @@ unsigned int ext4_ext_check_overlap(struct inode *inode,
struct ext4_extent *newext,
struct ext4_ext_path *path)
{
- unsigned long b1, b2;
+ ext4_lblk_t b1, b2;
unsigned int depth, len1;
unsigned int ret = 0;
@@ -1260,7 +1407,7 @@ unsigned int ext4_ext_check_overlap(struct inode *inode,
goto out;
}
- /* check for wrap through zero */
+ /* check for wrap through zero on extent logical start block*/
if (b1 + len1 < b1) {
len1 = EXT_MAX_BLOCK - b1;
newext->ee_len = cpu_to_le16(len1);
@@ -1290,7 +1437,8 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
struct ext4_extent *ex, *fex;
struct ext4_extent *nearex; /* nearest extent */
struct ext4_ext_path *npath = NULL;
- int depth, len, err, next;
+ int depth, len, err;
+ ext4_lblk_t next;
unsigned uninitialized = 0;
BUG_ON(ext4_ext_get_actual_len(newext) == 0);
@@ -1435,114 +1583,8 @@ cleanup:
return err;
}
-int ext4_ext_walk_space(struct inode *inode, unsigned long block,
- unsigned long num, ext_prepare_callback func,
- void *cbdata)
-{
- struct ext4_ext_path *path = NULL;
- struct ext4_ext_cache cbex;
- struct ext4_extent *ex;
- unsigned long next, start = 0, end = 0;
- unsigned long last = block + num;
- int depth, exists, err = 0;
-
- BUG_ON(func == NULL);
- BUG_ON(inode == NULL);
-
- while (block < last && block != EXT_MAX_BLOCK) {
- num = last - block;
- /* find extent for this block */
- path = ext4_ext_find_extent(inode, block, path);
- if (IS_ERR(path)) {
- err = PTR_ERR(path);
- path = NULL;
- break;
- }
-
- depth = ext_depth(inode);
- BUG_ON(path[depth].p_hdr == NULL);
- ex = path[depth].p_ext;
- next = ext4_ext_next_allocated_block(path);
-
- exists = 0;
- if (!ex) {
- /* there is no extent yet, so try to allocate
- * all requested space */
- start = block;
- end = block + num;
- } else if (le32_to_cpu(ex->ee_block) > block) {
- /* need to allocate space before found extent */
- start = block;
- end = le32_to_cpu(ex->ee_block);
- if (block + num < end)
- end = block + num;
- } else if (block >= le32_to_cpu(ex->ee_block)
- + ext4_ext_get_actual_len(ex)) {
- /* need to allocate space after found extent */
- start = block;
- end = block + num;
- if (end >= next)
- end = next;
- } else if (block >= le32_to_cpu(ex->ee_block)) {
- /*
- * some part of requested space is covered
- * by found extent
- */
- start = block;
- end = le32_to_cpu(ex->ee_block)
- + ext4_ext_get_actual_len(ex);
- if (block + num < end)
- end = block + num;
- exists = 1;
- } else {
- BUG();
- }
- BUG_ON(end <= start);
-
- if (!exists) {
- cbex.ec_block = start;
- cbex.ec_len = end - start;
- cbex.ec_start = 0;
- cbex.ec_type = EXT4_EXT_CACHE_GAP;
- } else {
- cbex.ec_block = le32_to_cpu(ex->ee_block);
- cbex.ec_len = ext4_ext_get_actual_len(ex);
- cbex.ec_start = ext_pblock(ex);
- cbex.ec_type = EXT4_EXT_CACHE_EXTENT;
- }
-
- BUG_ON(cbex.ec_len == 0);
- err = func(inode, path, &cbex, cbdata);
- ext4_ext_drop_refs(path);
-
- if (err < 0)
- break;
- if (err == EXT_REPEAT)
- continue;
- else if (err == EXT_BREAK) {
- err = 0;
- break;
- }
-
- if (ext_depth(inode) != depth) {
- /* depth was changed. we have to realloc path */
- kfree(path);
- path = NULL;
- }
-
- block = cbex.ec_block + cbex.ec_len;
- }
-
- if (path) {
- ext4_ext_drop_refs(path);
- kfree(path);
- }
-
- return err;
-}
-
static void
-ext4_ext_put_in_cache(struct inode *inode, __u32 block,
+ext4_ext_put_in_cache(struct inode *inode, ext4_lblk_t block,
__u32 len, ext4_fsblk_t start, int type)
{
struct ext4_ext_cache *cex;
@@ -1561,10 +1603,11 @@ ext4_ext_put_in_cache(struct inode *inode, __u32 block,
*/
static void
ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
- unsigned long block)
+ ext4_lblk_t block)
{
int depth = ext_depth(inode);
- unsigned long lblock, len;
+ unsigned long len;
+ ext4_lblk_t lblock;
struct ext4_extent *ex;
ex = path[depth].p_ext;
@@ -1576,32 +1619,34 @@ ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
} else if (block < le32_to_cpu(ex->ee_block)) {
lblock = block;
len = le32_to_cpu(ex->ee_block) - block;
- ext_debug("cache gap(before): %lu [%lu:%lu]",
- (unsigned long) block,
- (unsigned long) le32_to_cpu(ex->ee_block),
- (unsigned long) ext4_ext_get_actual_len(ex));
+ ext_debug("cache gap(before): %u [%u:%u]",
+ block,
+ le32_to_cpu(ex->ee_block),
+ ext4_ext_get_actual_len(ex));
} else if (block >= le32_to_cpu(ex->ee_block)
+ ext4_ext_get_actual_len(ex)) {
+ ext4_lblk_t next;
lblock = le32_to_cpu(ex->ee_block)
+ ext4_ext_get_actual_len(ex);
- len = ext4_ext_next_allocated_block(path);
- ext_debug("cache gap(after): [%lu:%lu] %lu",
- (unsigned long) le32_to_cpu(ex->ee_block),
- (unsigned long) ext4_ext_get_actual_len(ex),
- (unsigned long) block);
- BUG_ON(len == lblock);
- len = len - lblock;
+
+ next = ext4_ext_next_allocated_block(path);
+ ext_debug("cache gap(after): [%u:%u] %u",
+ le32_to_cpu(ex->ee_block),
+ ext4_ext_get_actual_len(ex),
+ block);
+ BUG_ON(next == lblock);
+ len = next - lblock;
} else {
lblock = len = 0;
BUG();
}
- ext_debug(" -> %lu:%lu\n", (unsigned long) lblock, len);
+ ext_debug(" -> %u:%lu\n", lblock, len);
ext4_ext_put_in_cache(inode, lblock, len, 0, EXT4_EXT_CACHE_GAP);
}
static int
-ext4_ext_in_cache(struct inode *inode, unsigned long block,
+ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
struct ext4_extent *ex)
{
struct ext4_ext_cache *cex;
@@ -1618,11 +1663,9 @@ ext4_ext_in_cache(struct inode *inode, unsigned long block,
ex->ee_block = cpu_to_le32(cex->ec_block);
ext4_ext_store_pblock(ex, cex->ec_start);
ex->ee_len = cpu_to_le16(cex->ec_len);
- ext_debug("%lu cached by %lu:%lu:%llu\n",
- (unsigned long) block,
- (unsigned long) cex->ec_block,
- (unsigned long) cex->ec_len,
- cex->ec_start);
+ ext_debug("%u cached by %u:%u:%llu\n",
+ block,
+ cex->ec_block, cex->ec_len, cex->ec_start);
return cex->ec_type;
}
@@ -1636,7 +1679,7 @@ ext4_ext_in_cache(struct inode *inode, unsigned long block,
* It's used in truncate case only, thus all requests are for
* last index in the block only.
*/
-int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
+static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path)
{
struct buffer_head *bh;
@@ -1657,7 +1700,7 @@ int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
ext_debug("index is empty, remove it, free block %llu\n", leaf);
bh = sb_find_get_block(inode->i_sb, leaf);
ext4_forget(handle, 1, inode, bh, leaf);
- ext4_free_blocks(handle, inode, leaf, 1);
+ ext4_free_blocks(handle, inode, leaf, 1, 1);
return err;
}
@@ -1666,7 +1709,7 @@ int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
* This routine returns max. credits that the extent tree can consume.
* It should be OK for low-performance paths like ->writepage()
* To allow many writing processes to fit into a single transaction,
- * the caller should calculate credits under truncate_mutex and
+ * the caller should calculate credits under i_data_sem and
* pass the actual path.
*/
int ext4_ext_calc_credits_for_insert(struct inode *inode,
@@ -1714,12 +1757,14 @@ int ext4_ext_calc_credits_for_insert(struct inode *inode,
static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
struct ext4_extent *ex,
- unsigned long from, unsigned long to)
+ ext4_lblk_t from, ext4_lblk_t to)
{
struct buffer_head *bh;
unsigned short ee_len = ext4_ext_get_actual_len(ex);
- int i;
+ int i, metadata = 0;
+ if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
+ metadata = 1;
#ifdef EXTENTS_STATS
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
@@ -1738,42 +1783,45 @@ static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
if (from >= le32_to_cpu(ex->ee_block)
&& to == le32_to_cpu(ex->ee_block) + ee_len - 1) {
/* tail removal */
- unsigned long num;
+ ext4_lblk_t num;
ext4_fsblk_t start;
+
num = le32_to_cpu(ex->ee_block) + ee_len - from;
start = ext_pblock(ex) + ee_len - num;
- ext_debug("free last %lu blocks starting %llu\n", num, start);
+ ext_debug("free last %u blocks starting %llu\n", num, start);
for (i = 0; i < num; i++) {
bh = sb_find_get_block(inode->i_sb, start + i);
ext4_forget(handle, 0, inode, bh, start + i);
}
- ext4_free_blocks(handle, inode, start, num);
+ ext4_free_blocks(handle, inode, start, num, metadata);
} else if (from == le32_to_cpu(ex->ee_block)
&& to <= le32_to_cpu(ex->ee_block) + ee_len - 1) {
- printk("strange request: removal %lu-%lu from %u:%u\n",
+ printk(KERN_INFO "strange request: removal %u-%u from %u:%u\n",
from, to, le32_to_cpu(ex->ee_block), ee_len);
} else {
- printk("strange request: removal(2) %lu-%lu from %u:%u\n",
- from, to, le32_to_cpu(ex->ee_block), ee_len);
+ printk(KERN_INFO "strange request: removal(2) "
+ "%u-%u from %u:%u\n",
+ from, to, le32_to_cpu(ex->ee_block), ee_len);
}
return 0;
}
static int
ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
- struct ext4_ext_path *path, unsigned long start)
+ struct ext4_ext_path *path, ext4_lblk_t start)
{
int err = 0, correct_index = 0;
int depth = ext_depth(inode), credits;
struct ext4_extent_header *eh;
- unsigned a, b, block, num;
- unsigned long ex_ee_block;
+ ext4_lblk_t a, b, block;
+ unsigned num;
+ ext4_lblk_t ex_ee_block;
unsigned short ex_ee_len;
unsigned uninitialized = 0;
struct ext4_extent *ex;
/* the header must be checked already in ext4_ext_remove_space() */
- ext_debug("truncate since %lu in leaf\n", start);
+ ext_debug("truncate since %u in leaf\n", start);
if (!path[depth].p_hdr)
path[depth].p_hdr = ext_block_hdr(path[depth].p_bh);
eh = path[depth].p_hdr;
@@ -1904,7 +1952,7 @@ ext4_ext_more_to_rm(struct ext4_ext_path *path)
return 1;
}
-int ext4_ext_remove_space(struct inode *inode, unsigned long start)
+static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start)
{
struct super_block *sb = inode->i_sb;
int depth = ext_depth(inode);
@@ -1912,7 +1960,7 @@ int ext4_ext_remove_space(struct inode *inode, unsigned long start)
handle_t *handle;
int i = 0, err = 0;
- ext_debug("truncate since %lu\n", start);
+ ext_debug("truncate since %u\n", start);
/* probably first extent we're gonna free will be last in block */
handle = ext4_journal_start(inode, depth + 1);
@@ -2094,17 +2142,19 @@ void ext4_ext_release(struct super_block *sb)
* b> Splits in two extents: Write is happening at either end of the extent
* c> Splits in three extents: Somone is writing in middle of the extent
*/
-int ext4_ext_convert_to_initialized(handle_t *handle, struct inode *inode,
- struct ext4_ext_path *path,
- ext4_fsblk_t iblock,
- unsigned long max_blocks)
+static int ext4_ext_convert_to_initialized(handle_t *handle,
+ struct inode *inode,
+ struct ext4_ext_path *path,
+ ext4_lblk_t iblock,
+ unsigned long max_blocks)
{
struct ext4_extent *ex, newex;
struct ext4_extent *ex1 = NULL;
struct ext4_extent *ex2 = NULL;
struct ext4_extent *ex3 = NULL;
struct ext4_extent_header *eh;
- unsigned int allocated, ee_block, ee_len, depth;
+ ext4_lblk_t ee_block;
+ unsigned int allocated, ee_len, depth;
ext4_fsblk_t newblock;
int err = 0;
int ret = 0;
@@ -2225,8 +2275,13 @@ out:
return err ? err : allocated;
}
+/*
+ * Need to be called with
+ * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block
+ * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem)
+ */
int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
- ext4_fsblk_t iblock,
+ ext4_lblk_t iblock,
unsigned long max_blocks, struct buffer_head *bh_result,
int create, int extend_disksize)
{
@@ -2236,11 +2291,11 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, newblock;
int err = 0, depth, ret;
unsigned long allocated = 0;
+ struct ext4_allocation_request ar;
__clear_bit(BH_New, &bh_result->b_state);
- ext_debug("blocks %d/%lu requested for inode %u\n", (int) iblock,
- max_blocks, (unsigned) inode->i_ino);
- mutex_lock(&EXT4_I(inode)->truncate_mutex);
+ ext_debug("blocks %u/%lu requested for inode %u\n",
+ iblock, max_blocks, inode->i_ino);
/* check in cache */
goal = ext4_ext_in_cache(inode, iblock, &newex);
@@ -2260,7 +2315,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
- le32_to_cpu(newex.ee_block)
+ ext_pblock(&newex);
/* number of remaining blocks in the extent */
- allocated = le16_to_cpu(newex.ee_len) -
+ allocated = ext4_ext_get_actual_len(&newex) -
(iblock - le32_to_cpu(newex.ee_block));
goto out;
} else {
@@ -2288,7 +2343,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ex = path[depth].p_ext;
if (ex) {
- unsigned long ee_block = le32_to_cpu(ex->ee_block);
+ ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
ext4_fsblk_t ee_start = ext_pblock(ex);
unsigned short ee_len;
@@ -2302,7 +2357,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
newblock = iblock - ee_block + ee_start;
/* number of remaining blocks in the extent */
allocated = ee_len - (iblock - ee_block);
- ext_debug("%d fit into %lu:%d -> %llu\n", (int) iblock,
+ ext_debug("%u fit into %lu:%d -> %llu\n", iblock,
ee_block, ee_len, newblock);
/* Do not put uninitialized extent in the cache */
@@ -2320,9 +2375,10 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ret = ext4_ext_convert_to_initialized(handle, inode,
path, iblock,
max_blocks);
- if (ret <= 0)
+ if (ret <= 0) {
+ err = ret;
goto out2;
- else
+ } else
allocated = ret;
goto outnew;
}
@@ -2347,8 +2403,15 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
if (S_ISREG(inode->i_mode) && (!EXT4_I(inode)->i_block_alloc_info))
ext4_init_block_alloc_info(inode);
- /* allocate new block */
- goal = ext4_ext_find_goal(inode, path, iblock);
+ /* find neighbour allocated blocks */
+ ar.lleft = iblock;
+ err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
+ if (err)
+ goto out2;
+ ar.lright = iblock;
+ err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright);
+ if (err)
+ goto out2;
/*
* See if request is beyond maximum number of blocks we can have in
@@ -2368,10 +2431,21 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
newex.ee_len = cpu_to_le16(max_blocks);
err = ext4_ext_check_overlap(inode, &newex, path);
if (err)
- allocated = le16_to_cpu(newex.ee_len);
+ allocated = ext4_ext_get_actual_len(&newex);
else
allocated = max_blocks;
- newblock = ext4_new_blocks(handle, inode, goal, &allocated, &err);
+
+ /* allocate new block */
+ ar.inode = inode;
+ ar.goal = ext4_ext_find_goal(inode, path, iblock);
+ ar.logical = iblock;
+ ar.len = allocated;
+ if (S_ISREG(inode->i_mode))
+ ar.flags = EXT4_MB_HINT_DATA;
+ else
+ /* disable in-core preallocation for non-regular files */
+ ar.flags = 0;
+ newblock = ext4_mb_new_blocks(handle, &ar, &err);
if (!newblock)
goto out2;
ext_debug("allocate new block: goal %llu, found %llu/%lu\n",
@@ -2379,14 +2453,17 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
/* try to insert new extent into found leaf and return */
ext4_ext_store_pblock(&newex, newblock);
- newex.ee_len = cpu_to_le16(allocated);
+ newex.ee_len = cpu_to_le16(ar.len);
if (create == EXT4_CREATE_UNINITIALIZED_EXT) /* Mark uninitialized */
ext4_ext_mark_uninitialized(&newex);
err = ext4_ext_insert_extent(handle, inode, path, &newex);
if (err) {
/* free data blocks we just allocated */
+ /* not a good idea to call discard here directly,
+ * but otherwise we'd need to call it every free() */
+ ext4_mb_discard_inode_preallocations(inode);
ext4_free_blocks(handle, inode, ext_pblock(&newex),
- le16_to_cpu(newex.ee_len));
+ ext4_ext_get_actual_len(&newex), 0);
goto out2;
}
@@ -2395,6 +2472,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
/* previous routine could use block we allocated */
newblock = ext_pblock(&newex);
+ allocated = ext4_ext_get_actual_len(&newex);
outnew:
__set_bit(BH_New, &bh_result->b_state);
@@ -2414,8 +2492,6 @@ out2:
ext4_ext_drop_refs(path);
kfree(path);
}
- mutex_unlock(&EXT4_I(inode)->truncate_mutex);
-
return err ? err : allocated;
}
@@ -2423,7 +2499,7 @@ void ext4_ext_truncate(struct inode * inode, struct page *page)
{
struct address_space *mapping = inode->i_mapping;
struct super_block *sb = inode->i_sb;
- unsigned long last_block;
+ ext4_lblk_t last_block;
handle_t *handle;
int err = 0;
@@ -2445,9 +2521,11 @@ void ext4_ext_truncate(struct inode * inode, struct page *page)
if (page)
ext4_block_truncate_page(handle, page, mapping, inode->i_size);
- mutex_lock(&EXT4_I(inode)->truncate_mutex);
+ down_write(&EXT4_I(inode)->i_data_sem);
ext4_ext_invalidate_cache(inode);
+ ext4_mb_discard_inode_preallocations(inode);
+
/*
* TODO: optimization is possible here.
* Probably we need not scan at all,
@@ -2481,7 +2559,7 @@ out_stop:
if (inode->i_nlink)
ext4_orphan_del(handle, inode);
- mutex_unlock(&EXT4_I(inode)->truncate_mutex);
+ up_write(&EXT4_I(inode)->i_data_sem);
ext4_journal_stop(handle);
}
@@ -2516,7 +2594,8 @@ int ext4_ext_writepage_trans_blocks(struct inode *inode, int num)
long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
{
handle_t *handle;
- ext4_fsblk_t block, max_blocks;
+ ext4_lblk_t block;
+ unsigned long max_blocks;
ext4_fsblk_t nblocks = 0;
int ret = 0;
int ret2 = 0;
@@ -2544,6 +2623,7 @@ long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
* modify 1 super block, 1 block bitmap and 1 group descriptor.
*/
credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + 3;
+ down_write((&EXT4_I(inode)->i_data_sem));
retry:
while (ret >= 0 && ret < max_blocks) {
block = block + ret;
@@ -2557,12 +2637,12 @@ retry:
ret = ext4_ext_get_blocks(handle, inode, block,
max_blocks, &map_bh,
EXT4_CREATE_UNINITIALIZED_EXT, 0);
- WARN_ON(!ret);
- if (!ret) {
+ WARN_ON(ret <= 0);
+ if (ret <= 0) {
ext4_error(inode->i_sb, "ext4_fallocate",
- "ext4_ext_get_blocks returned 0! inode#%lu"
- ", block=%llu, max_blocks=%llu",
- inode->i_ino, block, max_blocks);
+ "ext4_ext_get_blocks returned error: "
+ "inode#%lu, block=%u, max_blocks=%lu",
+ inode->i_ino, block, max_blocks);
ret = -EIO;
ext4_mark_inode_dirty(handle, inode);
ret2 = ext4_journal_stop(handle);
@@ -2600,6 +2680,7 @@ retry:
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
+ up_write((&EXT4_I(inode)->i_data_sem));
/*
* Time to update the file size.
* Update only when preallocation was requested beyond the file size.
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 1a81cd66d63..ac35ec58db5 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -37,9 +37,9 @@ static int ext4_release_file (struct inode * inode, struct file * filp)
if ((filp->f_mode & FMODE_WRITE) &&
(atomic_read(&inode->i_writecount) == 1))
{
- mutex_lock(&EXT4_I(inode)->truncate_mutex);
+ down_write(&EXT4_I(inode)->i_data_sem);
ext4_discard_reservation(inode);
- mutex_unlock(&EXT4_I(inode)->truncate_mutex);
+ up_write(&EXT4_I(inode)->i_data_sem);
}
if (is_dx(inode) && filp->private_data)
ext4_htree_free_dir_info(filp->private_data);
@@ -56,8 +56,25 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
ssize_t ret;
int err;
- ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
+ /*
+ * If we have encountered a bitmap-format file, the size limit
+ * is smaller than s_maxbytes, which is for extent-mapped files.
+ */
+
+ if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) {
+ struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+ size_t length = iov_length(iov, nr_segs);
+ if (pos > sbi->s_bitmap_maxbytes)
+ return -EFBIG;
+
+ if (pos + length > sbi->s_bitmap_maxbytes) {
+ nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
+ sbi->s_bitmap_maxbytes - pos);
+ }
+ }
+
+ ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
/*
* Skip flushing if there was an error, or if nothing was written.
*/
diff --git a/fs/ext4/group.h b/fs/ext4/group.h
index 1577910bb58..7eb0604e7ee 100644
--- a/fs/ext4/group.h
+++ b/fs/ext4/group.h
@@ -14,14 +14,16 @@ extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
struct ext4_group_desc *gdp);
struct buffer_head *read_block_bitmap(struct super_block *sb,
- unsigned int block_group);
+ ext4_group_t block_group);
extern unsigned ext4_init_block_bitmap(struct super_block *sb,
- struct buffer_head *bh, int group,
+ struct buffer_head *bh,
+ ext4_group_t group,
struct ext4_group_desc *desc);
#define ext4_free_blocks_after_init(sb, group, desc) \
ext4_init_block_bitmap(sb, NULL, group, desc)
extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
- struct buffer_head *bh, int group,
+ struct buffer_head *bh,
+ ext4_group_t group,
struct ext4_group_desc *desc);
extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
#endif /* _LINUX_EXT4_GROUP_H */
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index c61f37fd3f0..575b5215c80 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -64,8 +64,8 @@ void mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
}
/* Initializes an uninitialized inode bitmap */
-unsigned ext4_init_inode_bitmap(struct super_block *sb,
- struct buffer_head *bh, int block_group,
+unsigned ext4_init_inode_bitmap(struct super_block *sb, struct buffer_head *bh,
+ ext4_group_t block_group,
struct ext4_group_desc *gdp)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
@@ -75,7 +75,7 @@ unsigned ext4_init_inode_bitmap(struct super_block *sb,
/* If checksum is bad mark all blocks and inodes use to prevent
* allocation, essentially implementing a per-group read-only flag. */
if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) {
- ext4_error(sb, __FUNCTION__, "Checksum bad for group %u\n",
+ ext4_error(sb, __FUNCTION__, "Checksum bad for group %lu\n",
block_group);
gdp->bg_free_blocks_count = 0;
gdp->bg_free_inodes_count = 0;
@@ -98,7 +98,7 @@ unsigned ext4_init_inode_bitmap(struct super_block *sb,
* Return buffer_head of bitmap on success or NULL.
*/
static struct buffer_head *
-read_inode_bitmap(struct super_block * sb, unsigned long block_group)
+read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
{
struct ext4_group_desc *desc;
struct buffer_head *bh = NULL;
@@ -152,7 +152,7 @@ void ext4_free_inode (handle_t *handle, struct inode * inode)
unsigned long ino;
struct buffer_head *bitmap_bh = NULL;
struct buffer_head *bh2;
- unsigned long block_group;
+ ext4_group_t block_group;
unsigned long bit;
struct ext4_group_desc * gdp;
struct ext4_super_block * es;
@@ -260,12 +260,14 @@ error_return:
* For other inodes, search forward from the parent directory\'s block
* group to find a free inode.
*/
-static int find_group_dir(struct super_block *sb, struct inode *parent)
+static int find_group_dir(struct super_block *sb, struct inode *parent,
+ ext4_group_t *best_group)
{
- int ngroups = EXT4_SB(sb)->s_groups_count;
+ ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
unsigned int freei, avefreei;
struct ext4_group_desc *desc, *best_desc = NULL;
- int group, best_group = -1;
+ ext4_group_t group;
+ int ret = -1;
freei = percpu_counter_read_positive(&EXT4_SB(sb)->s_freeinodes_counter);
avefreei = freei / ngroups;
@@ -279,11 +281,12 @@ static int find_group_dir(struct super_block *sb, struct inode *parent)
if (!best_desc ||
(le16_to_cpu(desc->bg_free_blocks_count) >
le16_to_cpu(best_desc->bg_free_blocks_count))) {
- best_group = group;
+ *best_group = group;
best_desc = desc;
+ ret = 0;
}
}
- return best_group;
+ return ret;
}
/*
@@ -314,12 +317,13 @@ static int find_group_dir(struct super_block *sb, struct inode *parent)
#define INODE_COST 64
#define BLOCK_COST 256
-static int find_group_orlov(struct super_block *sb, struct inode *parent)
+static int find_group_orlov(struct super_block *sb, struct inode *parent,
+ ext4_group_t *group)
{
- int parent_group = EXT4_I(parent)->i_block_group;
+ ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
- int ngroups = sbi->s_groups_count;
+ ext4_group_t ngroups = sbi->s_groups_count;
int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
unsigned int freei, avefreei;
ext4_fsblk_t freeb, avefreeb;
@@ -327,7 +331,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
unsigned int ndirs;
int max_debt, max_dirs, min_inodes;
ext4_grpblk_t min_blocks;
- int group = -1, i;
+ ext4_group_t i;
struct ext4_group_desc *desc;
freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
@@ -340,13 +344,14 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
if ((parent == sb->s_root->d_inode) ||
(EXT4_I(parent)->i_flags & EXT4_TOPDIR_FL)) {
int best_ndir = inodes_per_group;
- int best_group = -1;
+ ext4_group_t grp;
+ int ret = -1;
- get_random_bytes(&group, sizeof(group));
- parent_group = (unsigned)group % ngroups;
+ get_random_bytes(&grp, sizeof(grp));
+ parent_group = (unsigned)grp % ngroups;
for (i = 0; i < ngroups; i++) {
- group = (parent_group + i) % ngroups;
- desc = ext4_get_group_desc (sb, group, NULL);
+ grp = (parent_group + i) % ngroups;
+ desc = ext4_get_group_desc(sb, grp, NULL);
if (!desc || !desc->bg_free_inodes_count)
continue;
if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
@@ -355,11 +360,12 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
continue;
if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
continue;
- best_group = group;
+ *group = grp;
+ ret = 0;
best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
}
- if (best_group >= 0)
- return best_group;
+ if (ret == 0)
+ return ret;
goto fallback;
}
@@ -380,8 +386,8 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
max_debt = 1;
for (i = 0; i < ngroups; i++) {
- group = (parent_group + i) % ngroups;
- desc = ext4_get_group_desc (sb, group, NULL);
+ *group = (parent_group + i) % ngroups;
+ desc = ext4_get_group_desc(sb, *group, NULL);
if (!desc || !desc->bg_free_inodes_count)
continue;
if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
@@ -390,17 +396,16 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
continue;
if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
continue;
- return group;
+ return 0;
}
fallback:
for (i = 0; i < ngroups; i++) {
- group = (parent_group + i) % ngroups;
- desc = ext4_get_group_desc (sb, group, NULL);
- if (!desc || !desc->bg_free_inodes_count)
- continue;
- if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
- return group;
+ *group = (parent_group + i) % ngroups;
+ desc = ext4_get_group_desc(sb, *group, NULL);
+ if (desc && desc->bg_free_inodes_count &&
+ le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
+ return 0;
}
if (avefreei) {
@@ -415,21 +420,22 @@ fallback:
return -1;
}
-static int find_group_other(struct super_block *sb, struct inode *parent)
+static int find_group_other(struct super_block *sb, struct inode *parent,
+ ext4_group_t *group)
{
- int parent_group = EXT4_I(parent)->i_block_group;
- int ngroups = EXT4_SB(sb)->s_groups_count;
+ ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
+ ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
struct ext4_group_desc *desc;
- int group, i;
+ ext4_group_t i;
/*
* Try to place the inode in its parent directory
*/
- group = parent_group;
- desc = ext4_get_group_desc (sb, group, NULL);
+ *group = parent_group;
+ desc = ext4_get_group_desc(sb, *group, NULL);
if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
le16_to_cpu(desc->bg_free_blocks_count))
- return group;
+ return 0;
/*
* We're going to place this inode in a different blockgroup from its
@@ -440,33 +446,33 @@ static int find_group_other(struct super_block *sb, struct inode *parent)
*
* So add our directory's i_ino into the starting point for the hash.
*/
- group = (group + parent->i_ino) % ngroups;
+ *group = (*group + parent->i_ino) % ngroups;
/*
* Use a quadratic hash to find a group with a free inode and some free
* blocks.
*/
for (i = 1; i < ngroups; i <<= 1) {
- group += i;
- if (group >= ngroups)
- group -= ngroups;
- desc = ext4_get_group_desc (sb, group, NULL);
+ *group += i;
+ if (*group >= ngroups)
+ *group -= ngroups;
+ desc = ext4_get_group_desc(sb, *group, NULL);
if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
le16_to_cpu(desc->bg_free_blocks_count))
- return group;
+ return 0;
}
/*
* That failed: try linear search for a free inode, even if that group
* has no free blocks.
*/
- group = parent_group;
+ *group = parent_group;
for (i = 0; i < ngroups; i++) {
- if (++group >= ngroups)
- group = 0;
- desc = ext4_get_group_desc (sb, group, NULL);
+ if (++*group >= ngroups)
+ *group = 0;
+ desc = ext4_get_group_desc(sb, *group, NULL);
if (desc && le16_to_cpu(desc->bg_free_inodes_count))
- return group;
+ return 0;
}
return -1;
@@ -487,16 +493,17 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode)
struct super_block *sb;
struct buffer_head *bitmap_bh = NULL;
struct buffer_head *bh2;
- int group;
+ ext4_group_t group = 0;
unsigned long ino = 0;
struct inode * inode;
struct ext4_group_desc * gdp = NULL;
struct ext4_super_block * es;
struct ext4_inode_info *ei;
struct ext4_sb_info *sbi;
- int err = 0;
+ int ret2, err = 0;
struct inode *ret;
- int i, free = 0;
+ ext4_group_t i;
+ int free = 0;
/* Cannot create files in a deleted directory */
if (!dir || !dir->i_nlink)
@@ -512,14 +519,14 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode)
es = sbi->s_es;
if (S_ISDIR(mode)) {
if (test_opt (sb, OLDALLOC))
- group = find_group_dir(sb, dir);
+ ret2 = find_group_dir(sb, dir, &group);
else
- group = find_group_orlov(sb, dir);
+ ret2 = find_group_orlov(sb, dir, &group);
} else
- group = find_group_other(sb, dir);
+ ret2 = find_group_other(sb, dir, &group);
err = -ENOSPC;
- if (group == -1)
+ if (ret2 == -1)
goto out;
for (i = 0; i < sbi->s_groups_count; i++) {
@@ -583,7 +590,7 @@ got:
ino > EXT4_INODES_PER_GROUP(sb)) {
ext4_error(sb, __FUNCTION__,
"reserved inode or inode > inodes count - "
- "block_group = %d, inode=%lu", group,
+ "block_group = %lu, inode=%lu", group,
ino + group * EXT4_INODES_PER_GROUP(sb));
err = -EIO;
goto fail;
@@ -702,7 +709,6 @@ got:
if (!S_ISDIR(mode))
ei->i_flags &= ~EXT4_DIRSYNC_FL;
ei->i_file_acl = 0;
- ei->i_dir_acl = 0;
ei->i_dtime = 0;
ei->i_block_alloc_info = NULL;
ei->i_block_group = group;
@@ -741,13 +747,10 @@ got:
if (test_opt(sb, EXTENTS)) {
EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
ext4_ext_tree_init(handle, inode);
- if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
- err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
- if (err) goto fail;
- EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS);
- BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "call ext4_journal_dirty_metadata");
- err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh);
- }
+ err = ext4_update_incompat_feature(handle, sb,
+ EXT4_FEATURE_INCOMPAT_EXTENTS);
+ if (err)
+ goto fail;
}
ext4_debug("allocating inode %lu\n", inode->i_ino);
@@ -777,7 +780,7 @@ fail_drop:
struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
{
unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
- unsigned long block_group;
+ ext4_group_t block_group;
int bit;
struct buffer_head *bitmap_bh = NULL;
struct inode *inode = NULL;
@@ -833,7 +836,7 @@ unsigned long ext4_count_free_inodes (struct super_block * sb)
{
unsigned long desc_count;
struct ext4_group_desc *gdp;
- int i;
+ ext4_group_t i;
#ifdef EXT4FS_DEBUG
struct ext4_super_block *es;
unsigned long bitmap_count, x;
@@ -854,7 +857,7 @@ unsigned long ext4_count_free_inodes (struct super_block * sb)
continue;
x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8);
- printk("group %d: stored = %d, counted = %lu\n",
+ printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n",
i, le16_to_cpu(gdp->bg_free_inodes_count), x);
bitmap_count += x;
}
@@ -879,7 +882,7 @@ unsigned long ext4_count_free_inodes (struct super_block * sb)
unsigned long ext4_count_dirs (struct super_block * sb)
{
unsigned long count = 0;
- int i;
+ ext4_group_t i;
for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
struct ext4_group_desc *gdp = ext4_get_group_desc (sb, i, NULL);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5489703d957..bb717cbb749 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -105,7 +105,7 @@ int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
*/
static unsigned long blocks_for_truncate(struct inode *inode)
{
- unsigned long needed;
+ ext4_lblk_t needed;
needed = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9);
@@ -243,13 +243,6 @@ static inline void add_chain(Indirect *p, struct buffer_head *bh, __le32 *v)
p->bh = bh;
}
-static int verify_chain(Indirect *from, Indirect *to)
-{
- while (from <= to && from->key == *from->p)
- from++;
- return (from > to);
-}
-
/**
* ext4_block_to_path - parse the block number into array of offsets
* @inode: inode in question (we are only interested in its superblock)
@@ -282,7 +275,8 @@ static int verify_chain(Indirect *from, Indirect *to)
*/
static int ext4_block_to_path(struct inode *inode,
- long i_block, int offsets[4], int *boundary)
+ ext4_lblk_t i_block,
+ ext4_lblk_t offsets[4], int *boundary)
{
int ptrs = EXT4_ADDR_PER_BLOCK(inode->i_sb);
int ptrs_bits = EXT4_ADDR_PER_BLOCK_BITS(inode->i_sb);
@@ -313,7 +307,10 @@ static int ext4_block_to_path(struct inode *inode,
offsets[n++] = i_block & (ptrs - 1);
final = ptrs;
} else {
- ext4_warning(inode->i_sb, "ext4_block_to_path", "block > big");
+ ext4_warning(inode->i_sb, "ext4_block_to_path",
+ "block %lu > max",
+ i_block + direct_blocks +
+ indirect_blocks + double_blocks);
}
if (boundary)
*boundary = final - 1 - (i_block & (ptrs - 1));
@@ -344,12 +341,14 @@ static int ext4_block_to_path(struct inode *inode,
* (pointer to last triple returned, *@err == 0)
* or when it gets an IO error reading an indirect block
* (ditto, *@err == -EIO)
- * or when it notices that chain had been changed while it was reading
- * (ditto, *@err == -EAGAIN)
* or when it reads all @depth-1 indirect blocks successfully and finds
* the whole chain, all way to the data (returns %NULL, *err == 0).
+ *
+ * Need to be called with
+ * down_read(&EXT4_I(inode)->i_data_sem)
*/
-static Indirect *ext4_get_branch(struct inode *inode, int depth, int *offsets,
+static Indirect *ext4_get_branch(struct inode *inode, int depth,
+ ext4_lblk_t *offsets,
Indirect chain[4], int *err)
{
struct super_block *sb = inode->i_sb;
@@ -365,9 +364,6 @@ static Indirect *ext4_get_branch(struct inode *inode, int depth, int *offsets,
bh = sb_bread(sb, le32_to_cpu(p->key));
if (!bh)
goto failure;
- /* Reader: pointers */
- if (!verify_chain(chain, p))
- goto changed;
add_chain(++p, bh, (__le32*)bh->b_data + *++offsets);
/* Reader: end */
if (!p->key)
@@ -375,10 +371,6 @@ static Indirect *ext4_get_branch(struct inode *inode, int depth, int *offsets,
}
return NULL;
-changed:
- brelse(bh);
- *err = -EAGAIN;
- goto no_block;
failure:
*err = -EIO;
no_block:
@@ -445,7 +437,7 @@ static ext4_fsblk_t ext4_find_near(struct inode *inode, Indirect *ind)
* stores it in *@goal and returns zero.
*/
-static ext4_fsblk_t ext4_find_goal(struct inode *inode, long block,
+static ext4_fsblk_t ext4_find_goal(struct inode *inode, ext4_lblk_t block,
Indirect chain[4], Indirect *partial)
{
struct ext4_block_alloc_info *block_i;
@@ -559,7 +551,7 @@ static int ext4_alloc_blocks(handle_t *handle, struct inode *inode,
return ret;
failed_out:
for (i = 0; i <index; i++)
- ext4_free_blocks(handle, inode, new_blocks[i], 1);
+ ext4_free_blocks(handle, inode, new_blocks[i], 1, 0);
return ret;
}
@@ -590,7 +582,7 @@ failed_out:
*/
static int ext4_alloc_branch(handle_t *handle, struct inode *inode,
int indirect_blks, int *blks, ext4_fsblk_t goal,
- int *offsets, Indirect *branch)
+ ext4_lblk_t *offsets, Indirect *branch)
{
int blocksize = inode->i_sb->s_blocksize;
int i, n = 0;
@@ -658,9 +650,9 @@ failed:
ext4_journal_forget(handle, branch[i].bh);
}
for (i = 0; i <indirect_blks; i++)
- ext4_free_blocks(handle, inode, new_blocks[i], 1);
+ ext4_free_blocks(handle, inode, new_blocks[i], 1, 0);
- ext4_free_blocks(handle, inode, new_blocks[i], num);
+ ext4_free_blocks(handle, inode, new_blocks[i], num, 0);
return err;
}
@@ -680,7 +672,7 @@ failed:
* chain to new block and return 0.
*/
static int ext4_splice_branch(handle_t *handle, struct inode *inode,
- long block, Indirect *where, int num, int blks)
+ ext4_lblk_t block, Indirect *where, int num, int blks)
{
int i;
int err = 0;
@@ -757,9 +749,10 @@ err_out:
for (i = 1; i <= num; i++) {
BUFFER_TRACE(where[i].bh, "call jbd2_journal_forget");
ext4_journal_forget(handle, where[i].bh);
- ext4_free_blocks(handle,inode,le32_to_cpu(where[i-1].key),1);
+ ext4_free_blocks(handle, inode,
+ le32_to_cpu(where[i-1].key), 1, 0);
}
- ext4_free_blocks(handle, inode, le32_to_cpu(where[num].key), blks);
+ ext4_free_blocks(handle, inode, le32_to_cpu(where[num].key), blks, 0);
return err;
}
@@ -782,14 +775,19 @@ err_out:
* return > 0, # of blocks mapped or allocated.
* return = 0, if plain lookup failed.
* return < 0, error case.
+ *
+ *
+ * Need to be called with
+ * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block
+ * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem)
*/
int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
- sector_t iblock, unsigned long maxblocks,
+ ext4_lblk_t iblock, unsigned long maxblocks,
struct buffer_head *bh_result,
int create, int extend_disksize)
{
int err = -EIO;
- int offsets[4];
+ ext4_lblk_t offsets[4];
Indirect chain[4];
Indirect *partial;
ext4_fsblk_t goal;
@@ -803,7 +801,8 @@ int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
J_ASSERT(!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL));
J_ASSERT(handle != NULL || create == 0);
- depth = ext4_block_to_path(inode,iblock,offsets,&blocks_to_boundary);
+ depth = ext4_block_to_path(inode, iblock, offsets,
+ &blocks_to_boundary);
if (depth == 0)
goto out;
@@ -819,18 +818,6 @@ int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
while (count < maxblocks && count <= blocks_to_boundary) {
ext4_fsblk_t blk;
- if (!verify_chain(chain, partial)) {
- /*
- * Indirect block might be removed by
- * truncate while we were reading it.
- * Handling of that case: forget what we've
- * got now. Flag the err as EAGAIN, so it
- * will reread.
- */
- err = -EAGAIN;
- count = 0;
- break;
- }
blk = le32_to_cpu(*(chain[depth-1].p + count));
if (blk == first_block + count)
@@ -838,44 +825,13 @@ int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
else
break;
}
- if (err != -EAGAIN)
- goto got_it;
+ goto got_it;
}
/* Next simple case - plain lookup or failed read of indirect block */
if (!create || err == -EIO)
goto cleanup;
- mutex_lock(&ei->truncate_mutex);
-
- /*
- * If the indirect block is missing while we are reading
- * the chain(ext4_get_branch() returns -EAGAIN err), or
- * if the chain has been changed after we grab the semaphore,
- * (either because another process truncated this branch, or
- * another get_block allocated this branch) re-grab the chain to see if
- * the request block has been allocated or not.
- *
- * Since we already block the truncate/other get_block
- * at this point, we will have the current copy of the chain when we
- * splice the branch into the tree.
- */
- if (err == -EAGAIN || !verify_chain(chain, partial)) {
- while (partial > chain) {
- brelse(partial->bh);
- partial--;
- }
- partial = ext4_get_branch(inode, depth, offsets, chain, &err);
- if (!partial) {
- count++;
- mutex_unlock(&ei->truncate_mutex);
- if (err)
- goto cleanup;
- clear_buffer_new(bh_result);
- goto got_it;
- }
- }
-
/*
* Okay, we need to do block allocation. Lazily initialize the block
* allocation info here if necessary
@@ -911,13 +867,12 @@ int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
err = ext4_splice_branch(handle, inode, iblock,
partial, indirect_blks, count);
/*
- * i_disksize growing is protected by truncate_mutex. Don't forget to
+ * i_disksize growing is protected by i_data_sem. Don't forget to
* protect it if you're about to implement concurrent
* ext4_get_block() -bzzz
*/
if (!err && extend_disksize && inode->i_size > ei->i_disksize)
ei->i_disksize = inode->i_size;
- mutex_unlock(&ei->truncate_mutex);
if (err)
goto cleanup;
@@ -942,6 +897,47 @@ out:
#define DIO_CREDITS (EXT4_RESERVE_TRANS_BLOCKS + 32)
+int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
+ unsigned long max_blocks, struct buffer_head *bh,
+ int create, int extend_disksize)
+{
+ int retval;
+ /*
+ * Try to see if we can get the block without requesting
+ * for new file system block.
+ */
+ down_read((&EXT4_I(inode)->i_data_sem));
+ if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
+ retval = ext4_ext_get_blocks(handle, inode, block, max_blocks,
+ bh, 0, 0);
+ } else {
+ retval = ext4_get_blocks_handle(handle,
+ inode, block, max_blocks, bh, 0, 0);
+ }
+ up_read((&EXT4_I(inode)->i_data_sem));
+ if (!create || (retval > 0))
+ return retval;
+
+ /*
+ * We need to allocate new blocks which will result
+ * in i_data update
+ */
+ down_write((&EXT4_I(inode)->i_data_sem));
+ /*
+ * We need to check for EXT4 here because migrate
+ * could have changed the inode type in between
+ */
+ if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
+ retval = ext4_ext_get_blocks(handle, inode, block, max_blocks,
+ bh, create, extend_disksize);
+ } else {
+ retval = ext4_get_blocks_handle(handle, inode, block,
+ max_blocks, bh, create, extend_disksize);
+ }
+ up_write((&EXT4_I(inode)->i_data_sem));
+ return retval;
+}
+
static int ext4_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
@@ -996,7 +992,7 @@ get_block:
* `handle' can be NULL if create is zero
*/
struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
- long block, int create, int *errp)
+ ext4_lblk_t block, int create, int *errp)
{
struct buffer_head dummy;
int fatal = 0, err;
@@ -1063,7 +1059,7 @@ err:
}
struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
- int block, int create, int *err)
+ ext4_lblk_t block, int create, int *err)
{
struct buffer_head * bh;
@@ -1446,7 +1442,7 @@ static int jbd2_journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh)
* ext4_file_write() -> generic_file_write() -> __alloc_pages() -> ...
*
* Same applies to ext4_get_block(). We will deadlock on various things like
- * lock_journal and i_truncate_mutex.
+ * lock_journal and i_data_sem
*
* Setting PF_MEMALLOC here doesn't work - too many internal memory
* allocations fail.
@@ -1828,7 +1824,8 @@ int ext4_block_truncate_page(handle_t *handle, struct page *page,
{
ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT;
unsigned offset = from & (PAGE_CACHE_SIZE-1);
- unsigned blocksize, iblock, length, pos;
+ unsigned blocksize, length, pos;
+ ext4_lblk_t iblock;
struct inode *inode = mapping->host;
struct buffer_head *bh;
int err = 0;
@@ -1964,7 +1961,7 @@ static inline int all_zeroes(__le32 *p, __le32 *q)
* (no partially truncated stuff there). */
static Indirect *ext4_find_shared(struct inode *inode, int depth,
- int offsets[4], Indirect chain[4], __le32 *top)
+ ext4_lblk_t offsets[4], Indirect chain[4], __le32 *top)
{
Indirect *partial, *p;
int k, err;
@@ -2048,15 +2045,15 @@ static void ext4_clear_blocks(handle_t *handle, struct inode *inode,
for (p = first; p < last; p++) {
u32 nr = le32_to_cpu(*p);
if (nr) {
- struct buffer_head *bh;
+ struct buffer_head *tbh;
*p = 0;
- bh = sb_find_get_block(inode->i_sb, nr);
- ext4_forget(handle, 0, inode, bh, nr);
+ tbh = sb_find_get_block(inode->i_sb, nr);
+ ext4_forget(handle, 0, inode, tbh, nr);
}
}
- ext4_free_blocks(handle, inode, block_to_free, count);
+ ext4_free_blocks(handle, inode, block_to_free, count, 0);
}
/**
@@ -2229,7 +2226,7 @@ static void ext4_free_branches(handle_t *handle, struct inode *inode,
ext4_journal_test_restart(handle, inode);
}
- ext4_free_blocks(handle, inode, nr, 1);
+ ext4_free_blocks(handle, inode, nr, 1, 1);
if (parent_bh) {
/*
@@ -2289,12 +2286,12 @@ void ext4_truncate(struct inode *inode)
__le32 *i_data = ei->i_data;
int addr_per_block = EXT4_ADDR_PER_BLOCK(inode->i_sb);
struct address_space *mapping = inode->i_mapping;
- int offsets[4];
+ ext4_lblk_t offsets[4];
Indirect chain[4];
Indirect *partial;
__le32 nr = 0;
int n;
- long last_block;
+ ext4_lblk_t last_block;
unsigned blocksize = inode->i_sb->s_blocksize;
struct page *page;
@@ -2320,8 +2317,10 @@ void ext4_truncate(struct inode *inode)
return;
}
- if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
- return ext4_ext_truncate(inode, page);
+ if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
+ ext4_ext_truncate(inode, page);
+ return;
+ }
handle = start_transaction(inode);
if (IS_ERR(handle)) {
@@ -2369,7 +2368,7 @@ void ext4_truncate(struct inode *inode)
* From here we block out all ext4_get_block() callers who want to
* modify the block allocation tree.
*/
- mutex_lock(&ei->truncate_mutex);
+ down_write(&ei->i_data_sem);
if (n == 1) { /* direct blocks */
ext4_free_data(handle, inode, NULL, i_data+offsets[0],
@@ -2433,7 +2432,7 @@ do_indirects:
ext4_discard_reservation(inode);
- mutex_unlock(&ei->truncate_mutex);
+ up_write(&ei->i_data_sem);
inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
ext4_mark_inode_dirty(handle, inode);
@@ -2460,7 +2459,8 @@ out_stop:
static ext4_fsblk_t ext4_get_inode_block(struct super_block *sb,
unsigned long ino, struct ext4_iloc *iloc)
{
- unsigned long desc, group_desc, block_group;
+ unsigned long desc, group_desc;
+ ext4_group_t block_group;
unsigned long offset;
ext4_fsblk_t block;
struct buffer_head *bh;
@@ -2547,7 +2547,7 @@ static int __ext4_get_inode_loc(struct inode *inode,
struct ext4_group_desc *desc;
int inodes_per_buffer;
int inode_offset, i;
- int block_group;
+ ext4_group_t block_group;
int start;
block_group = (inode->i_ino - 1) /
@@ -2660,6 +2660,28 @@ void ext4_get_inode_flags(struct ext4_inode_info *ei)
if (flags & S_DIRSYNC)
ei->i_flags |= EXT4_DIRSYNC_FL;
}
+static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
+ struct ext4_inode_info *ei)
+{
+ blkcnt_t i_blocks ;
+ struct inode *inode = &(ei->vfs_inode);
+ struct super_block *sb = inode->i_sb;
+
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
+ /* we are using combined 48 bit field */
+ i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 |
+ le32_to_cpu(raw_inode->i_blocks_lo);
+ if (ei->i_flags & EXT4_HUGE_FILE_FL) {
+ /* i_blocks represent file system block size */
+ return i_blocks << (inode->i_blkbits - 9);
+ } else {
+ return i_blocks;
+ }
+ } else {
+ return le32_to_cpu(raw_inode->i_blocks_lo);
+ }
+}
void ext4_read_inode(struct inode * inode)
{
@@ -2687,7 +2709,6 @@ void ext4_read_inode(struct inode * inode)
inode->i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16;
}
inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
- inode->i_size = le32_to_cpu(raw_inode->i_size);
ei->i_state = 0;
ei->i_dir_start_lookup = 0;
@@ -2709,19 +2730,15 @@ void ext4_read_inode(struct inode * inode)
* recovery code: that's fine, we're about to complete
* the process of deleting those. */
}
- inode->i_blocks = le32_to_cpu(raw_inode->i_blocks);
ei->i_flags = le32_to_cpu(raw_inode->i_flags);
- ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
+ inode->i_blocks = ext4_inode_blocks(raw_inode, ei);
+ ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo);
if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
- cpu_to_le32(EXT4_OS_HURD))
+ cpu_to_le32(EXT4_OS_HURD)) {
ei->i_file_acl |=
((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32;
- if (!S_ISREG(inode->i_mode)) {
- ei->i_dir_acl = le32_to_cpu(raw_inode->i_dir_acl);
- } else {
- inode->i_size |=
- ((__u64)le32_to_cpu(raw_inode->i_size_high)) << 32;
}
+ inode->i_size = ext4_isize(raw_inode);
ei->i_disksize = inode->i_size;
inode->i_generation = le32_to_cpu(raw_inode->i_generation);
ei->i_block_group = iloc.block_group;
@@ -2765,6 +2782,13 @@ void ext4_read_inode(struct inode * inode)
EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode);
EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode);
+ inode->i_version = le32_to_cpu(raw_inode->i_disk_version);
+ if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) {
+ if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi))
+ inode->i_version |=
+ (__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32;
+ }
+
if (S_ISREG(inode->i_mode)) {
inode->i_op = &ext4_file_inode_operations;
inode->i_fop = &ext4_file_operations;
@@ -2797,6 +2821,55 @@ bad_inode:
return;
}
+static int ext4_inode_blocks_set(handle_t *handle,
+ struct ext4_inode *raw_inode,
+ struct ext4_inode_info *ei)
+{
+ struct inode *inode = &(ei->vfs_inode);
+ u64 i_blocks = inode->i_blocks;
+ struct super_block *sb = inode->i_sb;
+ int err = 0;
+
+ if (i_blocks <= ~0U) {
+ /*
+ * i_blocks can be represnted in a 32 bit variable
+ * as multiple of 512 bytes
+ */
+ raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
+ raw_inode->i_blocks_high = 0;
+ ei->i_flags &= ~EXT4_HUGE_FILE_FL;
+ } else if (i_blocks <= 0xffffffffffffULL) {
+ /*
+ * i_blocks can be represented in a 48 bit variable
+ * as multiple of 512 bytes
+ */
+ err = ext4_update_rocompat_feature(handle, sb,
+ EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
+ if (err)
+ goto err_out;
+ /* i_block is stored in the split 48 bit fields */
+ raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
+ raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
+ ei->i_flags &= ~EXT4_HUGE_FILE_FL;
+ } else {
+ /*
+ * i_blocks should be represented in a 48 bit variable
+ * as multiple of file system block size
+ */
+ err = ext4_update_rocompat_feature(handle, sb,
+ EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
+ if (err)
+ goto err_out;
+ ei->i_flags |= EXT4_HUGE_FILE_FL;
+ /* i_block is stored in file system block size */
+ i_blocks = i_blocks >> (inode->i_blkbits - 9);
+ raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
+ raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
+ }
+err_out:
+ return err;
+}
+
/*
* Post the struct inode info into an on-disk inode location in the
* buffer-cache. This gobbles the caller's reference to the
@@ -2845,47 +2918,42 @@ static int ext4_do_update_inode(handle_t *handle,
raw_inode->i_gid_high = 0;
}
raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
- raw_inode->i_size = cpu_to_le32(ei->i_disksize);
EXT4_INODE_SET_XTIME(i_ctime, inode, raw_inode);
EXT4_INODE_SET_XTIME(i_mtime, inode, raw_inode);
EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode);
EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode);
- raw_inode->i_blocks = cpu_to_le32(inode->i_blocks);
+ if (ext4_inode_blocks_set(handle, raw_inode, ei))
+ goto out_brelse;
raw_inode->i_dtime = cpu_to_le32(ei->i_dtime);
raw_inode->i_flags = cpu_to_le32(ei->i_flags);
if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
cpu_to_le32(EXT4_OS_HURD))
raw_inode->i_file_acl_high =
cpu_to_le16(ei->i_file_acl >> 32);
- raw_inode->i_file_acl = cpu_to_le32(ei->i_file_acl);
- if (!S_ISREG(inode->i_mode)) {
- raw_inode->i_dir_acl = cpu_to_le32(ei->i_dir_acl);
- } else {
- raw_inode->i_size_high =
- cpu_to_le32(ei->i_disksize >> 32);
- if (ei->i_disksize > 0x7fffffffULL) {
- struct super_block *sb = inode->i_sb;
- if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
- EXT4_FEATURE_RO_COMPAT_LARGE_FILE) ||
- EXT4_SB(sb)->s_es->s_rev_level ==
- cpu_to_le32(EXT4_GOOD_OLD_REV)) {
- /* If this is the first large file
- * created, add a flag to the superblock.
- */
- err = ext4_journal_get_write_access(handle,
- EXT4_SB(sb)->s_sbh);
- if (err)
- goto out_brelse;
- ext4_update_dynamic_rev(sb);
- EXT4_SET_RO_COMPAT_FEATURE(sb,
+ raw_inode->i_file_acl_lo = cpu_to_le32(ei->i_file_acl);
+ ext4_isize_set(raw_inode, ei->i_disksize);
+ if (ei->i_disksize > 0x7fffffffULL) {
+ struct super_block *sb = inode->i_sb;
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_LARGE_FILE) ||
+ EXT4_SB(sb)->s_es->s_rev_level ==
+ cpu_to_le32(EXT4_GOOD_OLD_REV)) {
+ /* If this is the first large file
+ * created, add a flag to the superblock.
+ */
+ err = ext4_journal_get_write_access(handle,
+ EXT4_SB(sb)->s_sbh);
+ if (err)
+ goto out_brelse;
+ ext4_update_dynamic_rev(sb);
+ EXT4_SET_RO_COMPAT_FEATURE(sb,
EXT4_FEATURE_RO_COMPAT_LARGE_FILE);
- sb->s_dirt = 1;
- handle->h_sync = 1;
- err = ext4_journal_dirty_metadata(handle,
- EXT4_SB(sb)->s_sbh);
- }
+ sb->s_dirt = 1;
+ handle->h_sync = 1;
+ err = ext4_journal_dirty_metadata(handle,
+ EXT4_SB(sb)->s_sbh);
}
}
raw_inode->i_generation = cpu_to_le32(inode->i_generation);
@@ -2903,8 +2971,14 @@ static int ext4_do_update_inode(handle_t *handle,
} else for (block = 0; block < EXT4_N_BLOCKS; block++)
raw_inode->i_block[block] = ei->i_data[block];
- if (ei->i_extra_isize)
+ raw_inode->i_disk_version = cpu_to_le32(inode->i_version);
+ if (ei->i_extra_isize) {
+ if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi))
+ raw_inode->i_version_hi =
+ cpu_to_le32(inode->i_version >> 32);
raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize);
+ }
+
BUFFER_TRACE(bh, "call ext4_journal_dirty_metadata");
rc = ext4_journal_dirty_metadata(handle, bh);
@@ -3024,6 +3098,17 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
ext4_journal_stop(handle);
}
+ if (attr->ia_valid & ATTR_SIZE) {
+ if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) {
+ struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+
+ if (attr->ia_size > sbi->s_bitmap_maxbytes) {
+ error = -EFBIG;
+ goto err_out;
+ }
+ }
+ }
+
if (S_ISREG(inode->i_mode) &&
attr->ia_valid & ATTR_SIZE && attr->ia_size < inode->i_size) {
handle_t *handle;
@@ -3120,6 +3205,9 @@ int ext4_mark_iloc_dirty(handle_t *handle,
{
int err = 0;
+ if (test_opt(inode->i_sb, I_VERSION))
+ inode_inc_iversion(inode);
+
/* the do_update_inode consumes one bh->b_count */
get_bh(iloc->bh);
@@ -3158,8 +3246,10 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
* Expand an inode by new_extra_isize bytes.
* Returns 0 on success or negative error number on failure.
*/
-int ext4_expand_extra_isize(struct inode *inode, unsigned int new_extra_isize,
- struct ext4_iloc iloc, handle_t *handle)
+static int ext4_expand_extra_isize(struct inode *inode,
+ unsigned int new_extra_isize,
+ struct ext4_iloc iloc,
+ handle_t *handle)
{
struct ext4_inode *raw_inode;
struct ext4_xattr_ibody_header *header;
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index e7f894bdb42..2ed7c37f897 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -199,7 +199,7 @@ flags_err:
* need to allocate reservation structure for this inode
* before set the window size
*/
- mutex_lock(&ei->truncate_mutex);
+ down_write(&ei->i_data_sem);
if (!ei->i_block_alloc_info)
ext4_init_block_alloc_info(inode);
@@ -207,7 +207,7 @@ flags_err:
struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
rsv->rsv_goal_size = rsv_window_size;
}
- mutex_unlock(&ei->truncate_mutex);
+ up_write(&ei->i_data_sem);
return 0;
}
case EXT4_IOC_GROUP_EXTEND: {
@@ -254,6 +254,9 @@ flags_err:
return err;
}
+ case EXT4_IOC_MIGRATE:
+ return ext4_ext_migrate(inode, filp, cmd, arg);
+
default:
return -ENOTTY;
}
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
new file mode 100644
index 00000000000..76e5fedc0a0
--- /dev/null
+++ b/fs/ext4/mballoc.c
@@ -0,0 +1,4552 @@
+/*
+ * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
+ * Written by Alex Tomas <alex@clusterfs.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public Licens
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
+ */
+
+
+/*
+ * mballoc.c contains the multiblocks allocation routines
+ */
+
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/ext4_jbd2.h>
+#include <linux/ext4_fs.h>
+#include <linux/quotaops.h>
+#include <linux/buffer_head.h>
+#include <linux/module.h>
+#include <linux/swap.h>
+#include <linux/proc_fs.h>
+#include <linux/pagemap.h>
+#include <linux/seq_file.h>
+#include <linux/version.h>
+#include "group.h"
+
+/*
+ * MUSTDO:
+ * - test ext4_ext_search_left() and ext4_ext_search_right()
+ * - search for metadata in few groups
+ *
+ * TODO v4:
+ * - normalization should take into account whether file is still open
+ * - discard preallocations if no free space left (policy?)
+ * - don't normalize tails
+ * - quota
+ * - reservation for superuser
+ *
+ * TODO v3:
+ * - bitmap read-ahead (proposed by Oleg Drokin aka green)
+ * - track min/max extents in each group for better group selection
+ * - mb_mark_used() may allocate chunk right after splitting buddy
+ * - tree of groups sorted by number of free blocks
+ * - error handling
+ */
+
+/*
+ * The allocation request involve request for multiple number of blocks
+ * near to the goal(block) value specified.
+ *
+ * During initialization phase of the allocator we decide to use the group
+ * preallocation or inode preallocation depending on the size file. The
+ * size of the file could be the resulting file size we would have after
+ * allocation or the current file size which ever is larger. If the size is
+ * less that sbi->s_mb_stream_request we select the group
+ * preallocation. The default value of s_mb_stream_request is 16
+ * blocks. This can also be tuned via
+ * /proc/fs/ext4/<partition>/stream_req. The value is represented in terms
+ * of number of blocks.
+ *
+ * The main motivation for having small file use group preallocation is to
+ * ensure that we have small file closer in the disk.
+ *
+ * First stage the allocator looks at the inode prealloc list
+ * ext4_inode_info->i_prealloc_list contain list of prealloc spaces for
+ * this particular inode. The inode prealloc space is represented as:
+ *
+ * pa_lstart -> the logical start block for this prealloc space
+ * pa_pstart -> the physical start block for this prealloc space
+ * pa_len -> lenght for this prealloc space
+ * pa_free -> free space available in this prealloc space
+ *
+ * The inode preallocation space is used looking at the _logical_ start
+ * block. If only the logical file block falls within the range of prealloc
+ * space we will consume the particular prealloc space. This make sure that
+ * that the we have contiguous physical blocks representing the file blocks
+ *
+ * The important thing to be noted in case of inode prealloc space is that
+ * we don't modify the values associated to inode prealloc space except
+ * pa_free.
+ *
+ * If we are not able to find blocks in the inode prealloc space and if we
+ * have the group allocation flag set then we look at the locality group
+ * prealloc space. These are per CPU prealloc list repreasented as
+ *
+ * ext4_sb_info.s_locality_groups[smp_processor_id()]
+ *
+ * The reason for having a per cpu locality group is to reduce the contention
+ * between CPUs. It is possible to get scheduled at this point.
+ *
+ * The locality group prealloc space is used looking at whether we have
+ * enough free space (pa_free) withing the prealloc space.
+ *
+ * If we can't allocate blocks via inode prealloc or/and locality group
+ * prealloc then we look at the buddy cache. The buddy cache is represented
+ * by ext4_sb_info.s_buddy_cache (struct inode) whose file offset gets
+ * mapped to the buddy and bitmap information regarding different
+ * groups. The buddy information is attached to buddy cache inode so that
+ * we can access them through the page cache. The information regarding
+ * each group is loaded via ext4_mb_load_buddy. The information involve
+ * block bitmap and buddy information. The information are stored in the
+ * inode as:
+ *
+ * { page }
+ * [ group 0 buddy][ group 0 bitmap] [group 1][ group 1]...
+ *
+ *
+ * one block each for bitmap and buddy information. So for each group we
+ * take up 2 blocks. A page can contain blocks_per_page (PAGE_CACHE_SIZE /
+ * blocksize) blocks. So it can have information regarding groups_per_page
+ * which is blocks_per_page/2
+ *
+ * The buddy cache inode is not stored on disk. The inode is thrown
+ * away when the filesystem is unmounted.
+ *
+ * We look for count number of blocks in the buddy cache. If we were able
+ * to locate that many free blocks we return with additional information
+ * regarding rest of the contiguous physical block available
+ *
+ * Before allocating blocks via buddy cache we normalize the request
+ * blocks. This ensure we ask for more blocks that we needed. The extra
+ * blocks that we get after allocation is added to the respective prealloc
+ * list. In case of inode preallocation we follow a list of heuristics
+ * based on file size. This can be found in ext4_mb_normalize_request. If
+ * we are doing a group prealloc we try to normalize the request to
+ * sbi->s_mb_group_prealloc. Default value of s_mb_group_prealloc is set to
+ * 512 blocks. This can be tuned via
+ * /proc/fs/ext4/<partition/group_prealloc. The value is represented in
+ * terms of number of blocks. If we have mounted the file system with -O
+ * stripe=<value> option the group prealloc request is normalized to the
+ * stripe value (sbi->s_stripe)
+ *
+ * The regular allocator(using the buddy cache) support few tunables.
+ *
+ * /proc/fs/ext4/<partition>/min_to_scan
+ * /proc/fs/ext4/<partition>/max_to_scan
+ * /proc/fs/ext4/<partition>/order2_req
+ *
+ * The regular allocator use buddy scan only if the request len is power of
+ * 2 blocks and the order of allocation is >= sbi->s_mb_order2_reqs. The
+ * value of s_mb_order2_reqs can be tuned via
+ * /proc/fs/ext4/<partition>/order2_req. If the request len is equal to
+ * stripe size (sbi->s_stripe), we try to search for contigous block in
+ * stripe size. This should result in better allocation on RAID setup. If
+ * not we search in the specific group using bitmap for best extents. The
+ * tunable min_to_scan and max_to_scan controll the behaviour here.
+ * min_to_scan indicate how long the mballoc __must__ look for a best
+ * extent and max_to_scanindicate how long the mballoc __can__ look for a
+ * best extent in the found extents. Searching for the blocks starts with
+ * the group specified as the goal value in allocation context via
+ * ac_g_ex. Each group is first checked based on the criteria whether it
+ * can used for allocation. ext4_mb_good_group explains how the groups are
+ * checked.
+ *
+ * Both the prealloc space are getting populated as above. So for the first
+ * request we will hit the buddy cache which will result in this prealloc
+ * space getting filled. The prealloc space is then later used for the
+ * subsequent request.
+ */
+
+/*
+ * mballoc operates on the following data:
+ * - on-disk bitmap
+ * - in-core buddy (actually includes buddy and bitmap)
+ * - preallocation descriptors (PAs)
+ *
+ * there are two types of preallocations:
+ * - inode
+ * assiged to specific inode and can be used for this inode only.
+ * it describes part of inode's space preallocated to specific
+ * physical blocks. any block from that preallocated can be used
+ * independent. the descriptor just tracks number of blocks left
+ * unused. so, before taking some block from descriptor, one must
+ * make sure corresponded logical block isn't allocated yet. this
+ * also means that freeing any block within descriptor's range
+ * must discard all preallocated blocks.
+ * - locality group
+ * assigned to specific locality group which does not translate to
+ * permanent set of inodes: inode can join and leave group. space
+ * from this type of preallocation can be used for any inode. thus
+ * it's consumed from the beginning to the end.
+ *
+ * relation between them can be expressed as:
+ * in-core buddy = on-disk bitmap + preallocation descriptors
+ *
+ * this mean blocks mballoc considers used are:
+ * - allocated blocks (persistent)
+ * - preallocated blocks (non-persistent)
+ *
+ * consistency in mballoc world means that at any time a block is either
+ * free or used in ALL structures. notice: "any time" should not be read
+ * literally -- time is discrete and delimited by locks.
+ *
+ * to keep it simple, we don't use block numbers, instead we count number of
+ * blocks: how many blocks marked used/free in on-disk bitmap, buddy and PA.
+ *
+ * all operations can be expressed as:
+ * - init buddy: buddy = on-disk + PAs
+ * - new PA: buddy += N; PA = N
+ * - use inode PA: on-disk += N; PA -= N
+ * - discard inode PA buddy -= on-disk - PA; PA = 0
+ * - use locality group PA on-disk += N; PA -= N
+ * - discard locality group PA buddy -= PA; PA = 0
+ * note: 'buddy -= on-disk - PA' is used to show that on-disk bitmap
+ * is used in real operation because we can't know actual used
+ * bits from PA, only from on-disk bitmap
+ *
+ * if we follow this strict logic, then all operations above should be atomic.
+ * given some of them can block, we'd have to use something like semaphores
+ * killing performance on high-end SMP hardware. let's try to relax it using
+ * the following knowledge:
+ * 1) if buddy is referenced, it's already initialized
+ * 2) while block is used in buddy and the buddy is referenced,
+ * nobody can re-allocate that block
+ * 3) we work on bitmaps and '+' actually means 'set bits'. if on-disk has
+ * bit set and PA claims same block, it's OK. IOW, one can set bit in
+ * on-disk bitmap if buddy has same bit set or/and PA covers corresponded
+ * block
+ *
+ * so, now we're building a concurrency table:
+ * - init buddy vs.
+ * - new PA
+ * blocks for PA are allocated in the buddy, buddy must be referenced
+ * until PA is linked to allocation group to avoid concurrent buddy init
+ * - use inode PA
+ * we need to make sure that either on-disk bitmap or PA has uptodate data
+ * given (3) we care that PA-=N operation doesn't interfere with init
+ * - discard inode PA
+ * the simplest way would be to have buddy initialized by the discard
+ * - use locality group PA
+ * again PA-=N must be serialized with init
+ * - discard locality group PA
+ * the simplest way would be to have buddy initialized by the discard
+ * - new PA vs.
+ * - use inode PA
+ * i_data_sem serializes them
+ * - discard inode PA
+ * discard process must wait until PA isn't used by another process
+ * - use locality group PA
+ * some mutex should serialize them
+ * - discard locality group PA
+ * discard process must wait until PA isn't used by another process
+ * - use inode PA
+ * - use inode PA
+ * i_data_sem or another mutex should serializes them
+ * - discard inode PA
+ * discard process must wait until PA isn't used by another process
+ * - use locality group PA
+ * nothing wrong here -- they're different PAs covering different blocks
+ * - discard locality group PA
+ * discard process must wait until PA isn't used by another process
+ *
+ * now we're ready to make few consequences:
+ * - PA is referenced and while it is no discard is possible
+ * - PA is referenced until block isn't marked in on-disk bitmap
+ * - PA changes only after on-disk bitmap
+ * - discard must not compete with init. either init is done before
+ * any discard or they're serialized somehow
+ * - buddy init as sum of on-disk bitmap and PAs is done atomically
+ *
+ * a special case when we've used PA to emptiness. no need to modify buddy
+ * in this case, but we should care about concurrent init
+ *
+ */
+
+ /*
+ * Logic in few words:
+ *
+ * - allocation:
+ * load group
+ * find blocks
+ * mark bits in on-disk bitmap
+ * release group
+ *
+ * - use preallocation:
+ * find proper PA (per-inode or group)
+ * load group
+ * mark bits in on-disk bitmap
+ * release group
+ * release PA
+ *
+ * - free:
+ * load group
+ * mark bits in on-disk bitmap
+ * release group
+ *
+ * - discard preallocations in group:
+ * mark PAs deleted
+ * move them onto local list
+ * load on-disk bitmap
+ * load group
+ * remove PA from object (inode or locality group)
+ * mark free blocks in-core
+ *
+ * - discard inode's preallocations:
+ */
+
+/*
+ * Locking rules
+ *
+ * Locks:
+ * - bitlock on a group (group)
+ * - object (inode/locality) (object)
+ * - per-pa lock (pa)
+ *
+ * Paths:
+ * - new pa
+ * object
+ * group
+ *
+ * - find and use pa:
+ * pa
+ *
+ * - release consumed pa:
+ * pa
+ * group
+ * object
+ *
+ * - generate in-core bitmap:
+ * group
+ * pa
+ *
+ * - discard all for given object (inode, locality group):
+ * object
+ * pa
+ * group
+ *
+ * - discard all for given group:
+ * group
+ * pa
+ * group
+ * object
+ *
+ */
+
+/*
+ * with AGGRESSIVE_CHECK allocator runs consistency checks over
+ * structures. these checks slow things down a lot
+ */
+#define AGGRESSIVE_CHECK__
+
+/*
+ * with DOUBLE_CHECK defined mballoc creates persistent in-core
+ * bitmaps, maintains and uses them to check for double allocations
+ */
+#define DOUBLE_CHECK__
+
+/*
+ */
+#define MB_DEBUG__
+#ifdef MB_DEBUG
+#define mb_debug(fmt, a...) printk(fmt, ##a)
+#else
+#define mb_debug(fmt, a...)
+#endif
+
+/*
+ * with EXT4_MB_HISTORY mballoc stores last N allocations in memory
+ * and you can monitor it in /proc/fs/ext4/<dev>/mb_history
+ */
+#define EXT4_MB_HISTORY
+#define EXT4_MB_HISTORY_ALLOC 1 /* allocation */
+#define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */
+#define EXT4_MB_HISTORY_DISCARD 4 /* preallocation discarded */
+#define EXT4_MB_HISTORY_FREE 8 /* free */
+
+#define EXT4_MB_HISTORY_DEFAULT (EXT4_MB_HISTORY_ALLOC | \
+ EXT4_MB_HISTORY_PREALLOC)
+
+/*
+ * How long mballoc can look for a best extent (in found extents)
+ */
+#define MB_DEFAULT_MAX_TO_SCAN 200
+
+/*
+ * How long mballoc must look for a best extent
+ */
+#define MB_DEFAULT_MIN_TO_SCAN 10
+
+/*
+ * How many groups mballoc will scan looking for the best chunk
+ */
+#define MB_DEFAULT_MAX_GROUPS_TO_SCAN 5
+
+/*
+ * with 'ext4_mb_stats' allocator will collect stats that will be
+ * shown at umount. The collecting costs though!
+ */
+#define MB_DEFAULT_STATS 1
+
+/*
+ * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served
+ * by the stream allocator, which purpose is to pack requests
+ * as close each to other as possible to produce smooth I/O traffic
+ * We use locality group prealloc space for stream request.
+ * We can tune the same via /proc/fs/ext4/<parition>/stream_req
+ */
+#define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */
+
+/*
+ * for which requests use 2^N search using buddies
+ */
+#define MB_DEFAULT_ORDER2_REQS 2
+
+/*
+ * default group prealloc size 512 blocks
+ */
+#define MB_DEFAULT_GROUP_PREALLOC 512
+
+static struct kmem_cache *ext4_pspace_cachep;
+
+#ifdef EXT4_BB_MAX_BLOCKS
+#undef EXT4_BB_MAX_BLOCKS
+#endif
+#define EXT4_BB_MAX_BLOCKS 30
+
+struct ext4_free_metadata {
+ ext4_group_t group;
+ unsigned short num;
+ ext4_grpblk_t blocks[EXT4_BB_MAX_BLOCKS];
+ struct list_head list;
+};
+
+struct ext4_group_info {
+ unsigned long bb_state;
+ unsigned long bb_tid;
+ struct ext4_free_metadata *bb_md_cur;
+ unsigned short bb_first_free;
+ unsigned short bb_free;
+ unsigned short bb_fragments;
+ struct list_head bb_prealloc_list;
+#ifdef DOUBLE_CHECK
+ void *bb_bitmap;
+#endif
+ unsigned short bb_counters[];
+};
+
+#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
+#define EXT4_GROUP_INFO_LOCKED_BIT 1
+
+#define EXT4_MB_GRP_NEED_INIT(grp) \
+ (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
+
+
+struct ext4_prealloc_space {
+ struct list_head pa_inode_list;
+ struct list_head pa_group_list;
+ union {
+ struct list_head pa_tmp_list;
+ struct rcu_head pa_rcu;
+ } u;
+ spinlock_t pa_lock;
+ atomic_t pa_count;
+ unsigned pa_deleted;
+ ext4_fsblk_t pa_pstart; /* phys. block */
+ ext4_lblk_t pa_lstart; /* log. block */
+ unsigned short pa_len; /* len of preallocated chunk */
+ unsigned short pa_free; /* how many blocks are free */
+ unsigned short pa_linear; /* consumed in one direction
+ * strictly, for grp prealloc */
+ spinlock_t *pa_obj_lock;
+ struct inode *pa_inode; /* hack, for history only */
+};
+
+
+struct ext4_free_extent {
+ ext4_lblk_t fe_logical;
+ ext4_grpblk_t fe_start;
+ ext4_group_t fe_group;
+ int fe_len;
+};
+
+/*
+ * Locality group:
+ * we try to group all related changes together
+ * so that writeback can flush/allocate them together as well
+ */
+struct ext4_locality_group {
+ /* for allocator */
+ struct mutex lg_mutex; /* to serialize allocates */
+ struct list_head lg_prealloc_list;/* list of preallocations */
+ spinlock_t lg_prealloc_lock;
+};
+
+struct ext4_allocation_context {
+ struct inode *ac_inode;
+ struct super_block *ac_sb;
+
+ /* original request */
+ struct ext4_free_extent ac_o_ex;
+
+ /* goal request (after normalization) */
+ struct ext4_free_extent ac_g_ex;
+
+ /* the best found extent */
+ struct ext4_free_extent ac_b_ex;
+
+ /* copy of the bext found extent taken before preallocation efforts */
+ struct ext4_free_extent ac_f_ex;
+
+ /* number of iterations done. we have to track to limit searching */
+ unsigned long ac_ex_scanned;
+ __u16 ac_groups_scanned;
+ __u16 ac_found;
+ __u16 ac_tail;
+ __u16 ac_buddy;
+ __u16 ac_flags; /* allocation hints */
+ __u8 ac_status;
+ __u8 ac_criteria;
+ __u8 ac_repeats;
+ __u8 ac_2order; /* if request is to allocate 2^N blocks and
+ * N > 0, the field stores N, otherwise 0 */
+ __u8 ac_op; /* operation, for history only */
+ struct page *ac_bitmap_page;
+ struct page *ac_buddy_page;
+ struct ext4_prealloc_space *ac_pa;
+ struct ext4_locality_group *ac_lg;
+};
+
+#define AC_STATUS_CONTINUE 1
+#define AC_STATUS_FOUND 2
+#define AC_STATUS_BREAK 3
+
+struct ext4_mb_history {
+ struct ext4_free_extent orig; /* orig allocation */
+ struct ext4_free_extent goal; /* goal allocation */
+ struct ext4_free_extent result; /* result allocation */
+ unsigned pid;
+ unsigned ino;
+ __u16 found; /* how many extents have been found */
+ __u16 groups; /* how many groups have been scanned */
+ __u16 tail; /* what tail broke some buddy */
+ __u16 buddy; /* buddy the tail ^^^ broke */
+ __u16 flags;
+ __u8 cr:3; /* which phase the result extent was found at */
+ __u8 op:4;
+ __u8 merged:1;
+};
+
+struct ext4_buddy {
+ struct page *bd_buddy_page;
+ void *bd_buddy;
+ struct page *bd_bitmap_page;
+ void *bd_bitmap;
+ struct ext4_group_info *bd_info;
+ struct super_block *bd_sb;
+ __u16 bd_blkbits;
+ ext4_group_t bd_group;
+};
+#define EXT4_MB_BITMAP(e4b) ((e4b)->bd_bitmap)
+#define EXT4_MB_BUDDY(e4b) ((e4b)->bd_buddy)
+
+#ifndef EXT4_MB_HISTORY
+static inline void ext4_mb_store_history(struct ext4_allocation_context *ac)
+{
+ return;
+}
+#else
+static void ext4_mb_store_history(struct ext4_allocation_context *ac);
+#endif
+
+#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
+
+static struct proc_dir_entry *proc_root_ext4;
+struct buffer_head *read_block_bitmap(struct super_block *, ext4_group_t);
+ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t goal, unsigned long *count, int *errp);
+
+static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
+ ext4_group_t group);
+static void ext4_mb_poll_new_transaction(struct super_block *, handle_t *);
+static void ext4_mb_free_committed_blocks(struct super_block *);
+static void ext4_mb_return_to_preallocation(struct inode *inode,
+ struct ext4_buddy *e4b, sector_t block,
+ int count);
+static void ext4_mb_put_pa(struct ext4_allocation_context *,
+ struct super_block *, struct ext4_prealloc_space *pa);
+static int ext4_mb_init_per_dev_proc(struct super_block *sb);
+static int ext4_mb_destroy_per_dev_proc(struct super_block *sb);
+
+
+static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
+{
+ struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
+
+ bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
+}
+
+static inline void ext4_unlock_group(struct super_block *sb,
+ ext4_group_t group)
+{
+ struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
+
+ bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
+}
+
+static inline int ext4_is_group_locked(struct super_block *sb,
+ ext4_group_t group)
+{
+ struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
+
+ return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
+ &(grinfo->bb_state));
+}
+
+static ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
+ struct ext4_free_extent *fex)
+{
+ ext4_fsblk_t block;
+
+ block = (ext4_fsblk_t) fex->fe_group * EXT4_BLOCKS_PER_GROUP(sb)
+ + fex->fe_start
+ + le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
+ return block;
+}
+
+#if BITS_PER_LONG == 64
+#define mb_correct_addr_and_bit(bit, addr) \
+{ \
+ bit += ((unsigned long) addr & 7UL) << 3; \
+ addr = (void *) ((unsigned long) addr & ~7UL); \
+}
+#elif BITS_PER_LONG == 32
+#define mb_correct_addr_and_bit(bit, addr) \
+{ \
+ bit += ((unsigned long) addr & 3UL) << 3; \
+ addr = (void *) ((unsigned long) addr & ~3UL); \
+}
+#else
+#error "how many bits you are?!"
+#endif
+
+static inline int mb_test_bit(int bit, void *addr)
+{
+ /*
+ * ext4_test_bit on architecture like powerpc
+ * needs unsigned long aligned address
+ */
+ mb_correct_addr_and_bit(bit, addr);
+ return ext4_test_bit(bit, addr);
+}
+
+static inline void mb_set_bit(int bit, void *addr)
+{
+ mb_correct_addr_and_bit(bit, addr);
+ ext4_set_bit(bit, addr);
+}
+
+static inline void mb_set_bit_atomic(spinlock_t *lock, int bit, void *addr)
+{
+ mb_correct_addr_and_bit(bit, addr);
+ ext4_set_bit_atomic(lock, bit, addr);
+}
+
+static inline void mb_clear_bit(int bit, void *addr)
+{
+ mb_correct_addr_and_bit(bit, addr);
+ ext4_clear_bit(bit, addr);
+}
+
+static inline void mb_clear_bit_atomic(spinlock_t *lock, int bit, void *addr)
+{
+ mb_correct_addr_and_bit(bit, addr);
+ ext4_clear_bit_atomic(lock, bit, addr);
+}
+
+static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max)
+{
+ char *bb;
+
+ /* FIXME!! is this needed */
+ BUG_ON(EXT4_MB_BITMAP(e4b) == EXT4_MB_BUDDY(e4b));
+ BUG_ON(max == NULL);
+
+ if (order > e4b->bd_blkbits + 1) {
+ *max = 0;
+ return NULL;
+ }
+
+ /* at order 0 we see each particular block */
+ *max = 1 << (e4b->bd_blkbits + 3);
+ if (order == 0)
+ return EXT4_MB_BITMAP(e4b);
+
+ bb = EXT4_MB_BUDDY(e4b) + EXT4_SB(e4b->bd_sb)->s_mb_offsets[order];
+ *max = EXT4_SB(e4b->bd_sb)->s_mb_maxs[order];
+
+ return bb;
+}
+
+#ifdef DOUBLE_CHECK
+static void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b,
+ int first, int count)
+{
+ int i;
+ struct super_block *sb = e4b->bd_sb;
+
+ if (unlikely(e4b->bd_info->bb_bitmap == NULL))
+ return;
+ BUG_ON(!ext4_is_group_locked(sb, e4b->bd_group));
+ for (i = 0; i < count; i++) {
+ if (!mb_test_bit(first + i, e4b->bd_info->bb_bitmap)) {
+ ext4_fsblk_t blocknr;
+ blocknr = e4b->bd_group * EXT4_BLOCKS_PER_GROUP(sb);
+ blocknr += first + i;
+ blocknr +=
+ le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
+
+ ext4_error(sb, __FUNCTION__, "double-free of inode"
+ " %lu's block %llu(bit %u in group %lu)\n",
+ inode ? inode->i_ino : 0, blocknr,
+ first + i, e4b->bd_group);
+ }
+ mb_clear_bit(first + i, e4b->bd_info->bb_bitmap);
+ }
+}
+
+static void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count)
+{
+ int i;
+
+ if (unlikely(e4b->bd_info->bb_bitmap == NULL))
+ return;
+ BUG_ON(!ext4_is_group_locked(e4b->bd_sb, e4b->bd_group));
+ for (i = 0; i < count; i++) {
+ BUG_ON(mb_test_bit(first + i, e4b->bd_info->bb_bitmap));
+ mb_set_bit(first + i, e4b->bd_info->bb_bitmap);
+ }
+}
+
+static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
+{
+ if (memcmp(e4b->bd_info->bb_bitmap, bitmap, e4b->bd_sb->s_blocksize)) {
+ unsigned char *b1, *b2;
+ int i;
+ b1 = (unsigned char *) e4b->bd_info->bb_bitmap;
+ b2 = (unsigned char *) bitmap;
+ for (i = 0; i < e4b->bd_sb->s_blocksize; i++) {
+ if (b1[i] != b2[i]) {
+ printk("corruption in group %lu at byte %u(%u):"
+ " %x in copy != %x on disk/prealloc\n",
+ e4b->bd_group, i, i * 8, b1[i], b2[i]);
+ BUG();
+ }
+ }
+ }
+}
+
+#else
+static inline void mb_free_blocks_double(struct inode *inode,
+ struct ext4_buddy *e4b, int first, int count)
+{
+ return;
+}
+static inline void mb_mark_used_double(struct ext4_buddy *e4b,
+ int first, int count)
+{
+ return;
+}
+static inline void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
+{
+ return;
+}
+#endif
+
+#ifdef AGGRESSIVE_CHECK
+
+#define MB_CHECK_ASSERT(assert) \
+do { \
+ if (!(assert)) { \
+ printk(KERN_EMERG \
+ "Assertion failure in %s() at %s:%d: \"%s\"\n", \
+ function, file, line, # assert); \
+ BUG(); \
+ } \
+} while (0)
+
+static int __mb_check_buddy(struct ext4_buddy *e4b, char *file,
+ const char *function, int line)
+{
+ struct super_block *sb = e4b->bd_sb;
+ int order = e4b->bd_blkbits + 1;
+ int max;
+ int max2;
+ int i;
+ int j;
+ int k;
+ int count;
+ struct ext4_group_info *grp;
+ int fragments = 0;
+ int fstart;
+ struct list_head *cur;
+ void *buddy;
+ void *buddy2;
+
+ if (!test_opt(sb, MBALLOC))
+ return 0;
+
+ {
+ static int mb_check_counter;
+ if (mb_check_counter++ % 100 != 0)
+ return 0;
+ }
+
+ while (order > 1) {
+ buddy = mb_find_buddy(e4b, order, &max);
+ MB_CHECK_ASSERT(buddy);
+ buddy2 = mb_find_buddy(e4b, order - 1, &max2);
+ MB_CHECK_ASSERT(buddy2);
+ MB_CHECK_ASSERT(buddy != buddy2);
+ MB_CHECK_ASSERT(max * 2 == max2);
+
+ count = 0;
+ for (i = 0; i < max; i++) {
+
+ if (mb_test_bit(i, buddy)) {
+ /* only single bit in buddy2 may be 1 */
+ if (!mb_test_bit(i << 1, buddy2)) {
+ MB_CHECK_ASSERT(
+ mb_test_bit((i<<1)+1, buddy2));
+ } else if (!mb_test_bit((i << 1) + 1, buddy2)) {
+ MB_CHECK_ASSERT(
+ mb_test_bit(i << 1, buddy2));
+ }
+ continue;
+ }
+
+ /* both bits in buddy2 must be 0 */
+ MB_CHECK_ASSERT(mb_test_bit(i << 1, buddy2));
+ MB_CHECK_ASSERT(mb_test_bit((i << 1) + 1, buddy2));
+
+ for (j = 0; j < (1 << order); j++) {
+ k = (i * (1 << order)) + j;
+ MB_CHECK_ASSERT(
+ !mb_test_bit(k, EXT4_MB_BITMAP(e4b)));
+ }
+ count++;
+ }
+ MB_CHECK_ASSERT(e4b->bd_info->bb_counters[order] == count);
+ order--;
+ }
+
+ fstart = -1;
+ buddy = mb_find_buddy(e4b, 0, &max);
+ for (i = 0; i < max; i++) {
+ if (!mb_test_bit(i, buddy)) {
+ MB_CHECK_ASSERT(i >= e4b->bd_info->bb_first_free);
+ if (fstart == -1) {
+ fragments++;
+ fstart = i;
+ }
+ continue;
+ }
+ fstart = -1;
+ /* check used bits only */
+ for (j = 0; j < e4b->bd_blkbits + 1; j++) {
+ buddy2 = mb_find_buddy(e4b, j, &max2);
+ k = i >> j;
+ MB_CHECK_ASSERT(k < max2);
+ MB_CHECK_ASSERT(mb_test_bit(k, buddy2));
+ }
+ }
+ MB_CHECK_ASSERT(!EXT4_MB_GRP_NEED_INIT(e4b->bd_info));
+ MB_CHECK_ASSERT(e4b->bd_info->bb_fragments == fragments);
+
+ grp = ext4_get_group_info(sb, e4b->bd_group);
+ buddy = mb_find_buddy(e4b, 0, &max);
+ list_for_each(cur, &grp->bb_prealloc_list) {
+ ext4_group_t groupnr;
+ struct ext4_prealloc_space *pa;
+ pa = list_entry(cur, struct ext4_prealloc_space, group_list);
+ ext4_get_group_no_and_offset(sb, pa->pstart, &groupnr, &k);
+ MB_CHECK_ASSERT(groupnr == e4b->bd_group);
+ for (i = 0; i < pa->len; i++)
+ MB_CHECK_ASSERT(mb_test_bit(k + i, buddy));
+ }
+ return 0;
+}
+#undef MB_CHECK_ASSERT
+#define mb_check_buddy(e4b) __mb_check_buddy(e4b, \
+ __FILE__, __FUNCTION__, __LINE__)
+#else
+#define mb_check_buddy(e4b)
+#endif
+
+/* FIXME!! need more doc */
+static void ext4_mb_mark_free_simple(struct super_block *sb,
+ void *buddy, unsigned first, int len,
+ struct ext4_group_info *grp)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ unsigned short min;
+ unsigned short max;
+ unsigned short chunk;
+ unsigned short border;
+
+ BUG_ON(len >= EXT4_BLOCKS_PER_GROUP(sb));
+
+ border = 2 << sb->s_blocksize_bits;
+
+ while (len > 0) {
+ /* find how many blocks can be covered since this position */
+ max = ffs(first | border) - 1;
+
+ /* find how many blocks of power 2 we need to mark */
+ min = fls(len) - 1;
+
+ if (max < min)
+ min = max;
+ chunk = 1 << min;
+
+ /* mark multiblock chunks only */
+ grp->bb_counters[min]++;
+ if (min > 0)
+ mb_clear_bit(first >> min,
+ buddy + sbi->s_mb_offsets[min]);
+
+ len -= chunk;
+ first += chunk;
+ }
+}
+
+static void ext4_mb_generate_buddy(struct super_block *sb,
+ void *buddy, void *bitmap, ext4_group_t group)
+{
+ struct ext4_group_info *grp = ext4_get_group_info(sb, group);
+ unsigned short max = EXT4_BLOCKS_PER_GROUP(sb);
+ unsigned short i = 0;
+ unsigned short first;
+ unsigned short len;
+ unsigned free = 0;
+ unsigned fragments = 0;
+ unsigned long long period = get_cycles();
+
+ /* initialize buddy from bitmap which is aggregation
+ * of on-disk bitmap and preallocations */
+ i = ext4_find_next_zero_bit(bitmap, max, 0);
+ grp->bb_first_free = i;
+ while (i < max) {
+ fragments++;
+ first = i;
+ i = ext4_find_next_bit(bitmap, max, i);
+ len = i - first;
+ free += len;
+ if (len > 1)
+ ext4_mb_mark_free_simple(sb, buddy, first, len, grp);
+ else
+ grp->bb_counters[0]++;
+ if (i < max)
+ i = ext4_find_next_zero_bit(bitmap, max, i);
+ }
+ grp->bb_fragments = fragments;
+
+ if (free != grp->bb_free) {
+ printk(KERN_DEBUG
+ "EXT4-fs: group %lu: %u blocks in bitmap, %u in gd\n",
+ group, free, grp->bb_free);
+ grp->bb_free = free;
+ }
+
+ clear_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state));
+
+ period = get_cycles() - period;
+ spin_lock(&EXT4_SB(sb)->s_bal_lock);
+ EXT4_SB(sb)->s_mb_buddies_generated++;
+ EXT4_SB(sb)->s_mb_generation_time += period;
+ spin_unlock(&EXT4_SB(sb)->s_bal_lock);
+}
+
+/* The buddy information is attached the buddy cache inode
+ * for convenience. The information regarding each group
+ * is loaded via ext4_mb_load_buddy. The information involve
+ * block bitmap and buddy information. The information are
+ * stored in the inode as
+ *
+ * { page }
+ * [ group 0 buddy][ group 0 bitmap] [group 1][ group 1]...
+ *
+ *
+ * one block each for bitmap and buddy information.
+ * So for each group we take up 2 blocks. A page can
+ * contain blocks_per_page (PAGE_CACHE_SIZE / blocksize) blocks.
+ * So it can have information regarding groups_per_page which
+ * is blocks_per_page/2
+ */
+
+static int ext4_mb_init_cache(struct page *page, char *incore)
+{
+ int blocksize;
+ int blocks_per_page;
+ int groups_per_page;
+ int err = 0;
+ int i;
+ ext4_group_t first_group;
+ int first_block;
+ struct super_block *sb;
+ struct buffer_head *bhs;
+ struct buffer_head **bh;
+ struct inode *inode;
+ char *data;
+ char *bitmap;
+
+ mb_debug("init page %lu\n", page->index);
+
+ inode = page->mapping->host;
+ sb = inode->i_sb;
+ blocksize = 1 << inode->i_blkbits;
+ blocks_per_page = PAGE_CACHE_SIZE / blocksize;
+
+ groups_per_page = blocks_per_page >> 1;
+ if (groups_per_page == 0)
+ groups_per_page = 1;
+
+ /* allocate buffer_heads to read bitmaps */
+ if (groups_per_page > 1) {
+ err = -ENOMEM;
+ i = sizeof(struct buffer_head *) * groups_per_page;
+ bh = kzalloc(i, GFP_NOFS);
+ if (bh == NULL)
+ goto out;
+ } else
+ bh = &bhs;
+
+ first_group = page->index * blocks_per_page / 2;
+
+ /* read all groups the page covers into the cache */
+ for (i = 0; i < groups_per_page; i++) {
+ struct ext4_group_desc *desc;
+
+ if (first_group + i >= EXT4_SB(sb)->s_groups_count)
+ break;
+
+ err = -EIO;
+ desc = ext4_get_group_desc(sb, first_group + i, NULL);
+ if (desc == NULL)
+ goto out;
+
+ err = -ENOMEM;
+ bh[i] = sb_getblk(sb, ext4_block_bitmap(sb, desc));
+ if (bh[i] == NULL)
+ goto out;
+
+ if (bh_uptodate_or_lock(bh[i]))
+ continue;
+
+ if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
+ ext4_init_block_bitmap(sb, bh[i],
+ first_group + i, desc);
+ set_buffer_uptodate(bh[i]);
+ unlock_buffer(bh[i]);
+ continue;
+ }
+ get_bh(bh[i]);
+ bh[i]->b_end_io = end_buffer_read_sync;
+ submit_bh(READ, bh[i]);
+ mb_debug("read bitmap for group %lu\n", first_group + i);
+ }
+
+ /* wait for I/O completion */
+ for (i = 0; i < groups_per_page && bh[i]; i++)
+ wait_on_buffer(bh[i]);
+
+ err = -EIO;
+ for (i = 0; i < groups_per_page && bh[i]; i++)
+ if (!buffer_uptodate(bh[i]))
+ goto out;
+
+ first_block = page->index * blocks_per_page;
+ for (i = 0; i < blocks_per_page; i++) {
+ int group;
+ struct ext4_group_info *grinfo;
+
+ group = (first_block + i) >> 1;
+ if (group >= EXT4_SB(sb)->s_groups_count)
+ break;
+
+ /*
+ * data carry information regarding this
+ * particular group in the format specified
+ * above
+ *
+ */
+ data = page_address(page) + (i * blocksize);
+ bitmap = bh[group - first_group]->b_data;
+
+ /*
+ * We place the buddy block and bitmap block
+ * close together
+ */
+ if ((first_block + i) & 1) {
+ /* this is block of buddy */
+ BUG_ON(incore == NULL);
+ mb_debug("put buddy for group %u in page %lu/%x\n",
+ group, page->index, i * blocksize);
+ memset(data, 0xff, blocksize);
+ grinfo = ext4_get_group_info(sb, group);
+ grinfo->bb_fragments = 0;
+ memset(grinfo->bb_counters, 0,
+ sizeof(unsigned short)*(sb->s_blocksize_bits+2));
+ /*
+ * incore got set to the group block bitmap below
+ */
+ ext4_mb_generate_buddy(sb, data, incore, group);
+ incore = NULL;
+ } else {
+ /* this is block of bitmap */
+ BUG_ON(incore != NULL);
+ mb_debug("put bitmap for group %u in page %lu/%x\n",
+ group, page->index, i * blocksize);
+
+ /* see comments in ext4_mb_put_pa() */
+ ext4_lock_group(sb, group);
+ memcpy(data, bitmap, blocksize);
+
+ /* mark all preallocated blks used in in-core bitmap */
+ ext4_mb_generate_from_pa(sb, data, group);
+ ext4_unlock_group(sb, group);
+
+ /* set incore so that the buddy information can be
+ * generated using this
+ */
+ incore = data;
+ }
+ }
+ SetPageUptodate(page);
+
+out:
+ if (bh) {
+ for (i = 0; i < groups_per_page && bh[i]; i++)
+ brelse(bh[i]);
+ if (bh != &bhs)
+ kfree(bh);
+ }
+ return err;
+}
+
+static int ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
+ struct ext4_buddy *e4b)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct inode *inode = sbi->s_buddy_cache;
+ int blocks_per_page;
+ int block;
+ int pnum;
+ int poff;
+ struct page *page;
+
+ mb_debug("load group %lu\n", group);
+
+ blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
+
+ e4b->bd_blkbits = sb->s_blocksize_bits;
+ e4b->bd_info = ext4_get_group_info(sb, group);
+ e4b->bd_sb = sb;
+ e4b->bd_group = group;
+ e4b->bd_buddy_page = NULL;
+ e4b->bd_bitmap_page = NULL;
+
+ /*
+ * the buddy cache inode stores the block bitmap
+ * and buddy information in consecutive blocks.
+ * So for each group we need two blocks.
+ */
+ block = group * 2;
+ pnum = block / blocks_per_page;
+ poff = block % blocks_per_page;
+
+ /* we could use find_or_create_page(), but it locks page
+ * what we'd like to avoid in fast path ... */
+ page = find_get_page(inode->i_mapping, pnum);
+ if (page == NULL || !PageUptodate(page)) {
+ if (page)
+ page_cache_release(page);
+ page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
+ if (page) {
+ BUG_ON(page->mapping != inode->i_mapping);
+ if (!PageUptodate(page)) {
+ ext4_mb_init_cache(page, NULL);
+ mb_cmp_bitmaps(e4b, page_address(page) +
+ (poff * sb->s_blocksize));
+ }
+ unlock_page(page);
+ }
+ }
+ if (page == NULL || !PageUptodate(page))
+ goto err;
+ e4b->bd_bitmap_page = page;
+ e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize);
+ mark_page_accessed(page);
+
+ block++;
+ pnum = block / blocks_per_page;
+ poff = block % blocks_per_page;
+
+ page = find_get_page(inode->i_mapping, pnum);
+ if (page == NULL || !PageUptodate(page)) {
+ if (page)
+ page_cache_release(page);
+ page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
+ if (page) {
+ BUG_ON(page->mapping != inode->i_mapping);
+ if (!PageUptodate(page))
+ ext4_mb_init_cache(page, e4b->bd_bitmap);
+
+ unlock_page(page);
+ }
+ }
+ if (page == NULL || !PageUptodate(page))
+ goto err;
+ e4b->bd_buddy_page = page;
+ e4b->bd_buddy = page_address(page) + (poff * sb->s_blocksize);
+ mark_page_accessed(page);
+
+ BUG_ON(e4b->bd_bitmap_page == NULL);
+ BUG_ON(e4b->bd_buddy_page == NULL);
+
+ return 0;
+
+err:
+ if (e4b->bd_bitmap_page)
+ page_cache_release(e4b->bd_bitmap_page);
+ if (e4b->bd_buddy_page)
+ page_cache_release(e4b->bd_buddy_page);
+ e4b->bd_buddy = NULL;
+ e4b->bd_bitmap = NULL;
+ return -EIO;
+}
+
+static void ext4_mb_release_desc(struct ext4_buddy *e4b)
+{
+ if (e4b->bd_bitmap_page)
+ page_cache_release(e4b->bd_bitmap_page);
+ if (e4b->bd_buddy_page)
+ page_cache_release(e4b->bd_buddy_page);
+}
+
+
+static int mb_find_order_for_block(struct ext4_buddy *e4b, int block)
+{
+ int order = 1;
+ void *bb;
+
+ BUG_ON(EXT4_MB_BITMAP(e4b) == EXT4_MB_BUDDY(e4b));
+ BUG_ON(block >= (1 << (e4b->bd_blkbits + 3)));
+
+ bb = EXT4_MB_BUDDY(e4b);
+ while (order <= e4b->bd_blkbits + 1) {
+ block = block >> 1;
+ if (!mb_test_bit(block, bb)) {
+ /* this block is part of buddy of order 'order' */
+ return order;
+ }
+ bb += 1 << (e4b->bd_blkbits - order);
+ order++;
+ }
+ return 0;
+}
+
+static void mb_clear_bits(spinlock_t *lock, void *bm, int cur, int len)
+{
+ __u32 *addr;
+
+ len = cur + len;
+ while (cur < len) {
+ if ((cur & 31) == 0 && (len - cur) >= 32) {
+ /* fast path: clear whole word at once */
+ addr = bm + (cur >> 3);
+ *addr = 0;
+ cur += 32;
+ continue;
+ }
+ mb_clear_bit_atomic(lock, cur, bm);
+ cur++;
+ }
+}
+
+static void mb_set_bits(spinlock_t *lock, void *bm, int cur, int len)
+{
+ __u32 *addr;
+
+ len = cur + len;
+ while (cur < len) {
+ if ((cur & 31) == 0 && (len - cur) >= 32) {
+ /* fast path: set whole word at once */
+ addr = bm + (cur >> 3);
+ *addr = 0xffffffff;
+ cur += 32;
+ continue;
+ }
+ mb_set_bit_atomic(lock, cur, bm);
+ cur++;
+ }
+}
+
+static int mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
+ int first, int count)
+{
+ int block = 0;
+ int max = 0;
+ int order;
+ void *buddy;
+ void *buddy2;
+ struct super_block *sb = e4b->bd_sb;
+
+ BUG_ON(first + count > (sb->s_blocksize << 3));
+ BUG_ON(!ext4_is_group_locked(sb, e4b->bd_group));
+ mb_check_buddy(e4b);
+ mb_free_blocks_double(inode, e4b, first, count);
+
+ e4b->bd_info->bb_free += count;
+ if (first < e4b->bd_info->bb_first_free)
+ e4b->bd_info->bb_first_free = first;
+
+ /* let's maintain fragments counter */
+ if (first != 0)
+ block = !mb_test_bit(first - 1, EXT4_MB_BITMAP(e4b));
+ if (first + count < EXT4_SB(sb)->s_mb_maxs[0])
+ max = !mb_test_bit(first + count, EXT4_MB_BITMAP(e4b));
+ if (block && max)
+ e4b->bd_info->bb_fragments--;
+ else if (!block && !max)
+ e4b->bd_info->bb_fragments++;
+
+ /* let's maintain buddy itself */
+ while (count-- > 0) {
+ block = first++;
+ order = 0;
+
+ if (!mb_test_bit(block, EXT4_MB_BITMAP(e4b))) {
+ ext4_fsblk_t blocknr;
+ blocknr = e4b->bd_group * EXT4_BLOCKS_PER_GROUP(sb);
+ blocknr += block;
+ blocknr +=
+ le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
+
+ ext4_error(sb, __FUNCTION__, "double-free of inode"
+ " %lu's block %llu(bit %u in group %lu)\n",
+ inode ? inode->i_ino : 0, blocknr, block,
+ e4b->bd_group);
+ }
+ mb_clear_bit(block, EXT4_MB_BITMAP(e4b));
+ e4b->bd_info->bb_counters[order]++;
+
+ /* start of the buddy */
+ buddy = mb_find_buddy(e4b, order, &max);
+
+ do {
+ block &= ~1UL;
+ if (mb_test_bit(block, buddy) ||
+ mb_test_bit(block + 1, buddy))
+ break;
+
+ /* both the buddies are free, try to coalesce them */
+ buddy2 = mb_find_buddy(e4b, order + 1, &max);
+
+ if (!buddy2)
+ break;
+
+ if (order > 0) {
+ /* for special purposes, we don't set
+ * free bits in bitmap */
+ mb_set_bit(block, buddy);
+ mb_set_bit(block + 1, buddy);
+ }
+ e4b->bd_info->bb_counters[order]--;
+ e4b->bd_info->bb_counters[order]--;
+
+ block = block >> 1;
+ order++;
+ e4b->bd_info->bb_counters[order]++;
+
+ mb_clear_bit(block, buddy2);
+ buddy = buddy2;
+ } while (1);
+ }
+ mb_check_buddy(e4b);
+
+ return 0;
+}
+
+static int mb_find_extent(struct ext4_buddy *e4b, int order, int block,
+ int needed, struct ext4_free_extent *ex)
+{
+ int next = block;
+ int max;
+ int ord;
+ void *buddy;
+
+ BUG_ON(!ext4_is_group_locked(e4b->bd_sb, e4b->bd_group));
+ BUG_ON(ex == NULL);
+
+ buddy = mb_find_buddy(e4b, order, &max);
+ BUG_ON(buddy == NULL);
+ BUG_ON(block >= max);
+ if (mb_test_bit(block, buddy)) {
+ ex->fe_len = 0;
+ ex->fe_start = 0;
+ ex->fe_group = 0;
+ return 0;
+ }
+
+ /* FIXME dorp order completely ? */
+ if (likely(order == 0)) {
+ /* find actual order */
+ order = mb_find_order_for_block(e4b, block);
+ block = block >> order;
+ }
+
+ ex->fe_len = 1 << order;
+ ex->fe_start = block << order;
+ ex->fe_group = e4b->bd_group;
+
+ /* calc difference from given start */
+ next = next - ex->fe_start;
+ ex->fe_len -= next;
+ ex->fe_start += next;
+
+ while (needed > ex->fe_len &&
+ (buddy = mb_find_buddy(e4b, order, &max))) {
+
+ if (block + 1 >= max)
+ break;
+
+ next = (block + 1) * (1 << order);
+ if (mb_test_bit(next, EXT4_MB_BITMAP(e4b)))
+ break;
+
+ ord = mb_find_order_for_block(e4b, next);
+
+ order = ord;
+ block = next >> order;
+ ex->fe_len += 1 << order;
+ }
+
+ BUG_ON(ex->fe_start + ex->fe_len > (1 << (e4b->bd_blkbits + 3)));
+ return ex->fe_len;
+}
+
+static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex)
+{
+ int ord;
+ int mlen = 0;
+ int max = 0;
+ int cur;
+ int start = ex->fe_start;
+ int len = ex->fe_len;
+ unsigned ret = 0;
+ int len0 = len;
+ void *buddy;
+
+ BUG_ON(start + len > (e4b->bd_sb->s_blocksize << 3));
+ BUG_ON(e4b->bd_group != ex->fe_group);
+ BUG_ON(!ext4_is_group_locked(e4b->bd_sb, e4b->bd_group));
+ mb_check_buddy(e4b);
+ mb_mark_used_double(e4b, start, len);
+
+ e4b->bd_info->bb_free -= len;
+ if (e4b->bd_info->bb_first_free == start)
+ e4b->bd_info->bb_first_free += len;
+
+ /* let's maintain fragments counter */
+ if (start != 0)
+ mlen = !mb_test_bit(start - 1, EXT4_MB_BITMAP(e4b));
+ if (start + len < EXT4_SB(e4b->bd_sb)->s_mb_maxs[0])
+ max = !mb_test_bit(start + len, EXT4_MB_BITMAP(e4b));
+ if (mlen && max)
+ e4b->bd_info->bb_fragments++;
+ else if (!mlen && !max)
+ e4b->bd_info->bb_fragments--;
+
+ /* let's maintain buddy itself */
+ while (len) {
+ ord = mb_find_order_for_block(e4b, start);
+
+ if (((start >> ord) << ord) == start && len >= (1 << ord)) {
+ /* the whole chunk may be allocated at once! */
+ mlen = 1 << ord;
+ buddy = mb_find_buddy(e4b, ord, &max);
+ BUG_ON((start >> ord) >= max);
+ mb_set_bit(start >> ord, buddy);
+ e4b->bd_info->bb_counters[ord]--;
+ start += mlen;
+ len -= mlen;
+ BUG_ON(len < 0);
+ continue;
+ }
+
+ /* store for history */
+ if (ret == 0)
+ ret = len | (ord << 16);
+
+ /* we have to split large buddy */
+ BUG_ON(ord <= 0);
+ buddy = mb_find_buddy(e4b, ord, &max);
+ mb_set_bit(start >> ord, buddy);
+ e4b->bd_info->bb_counters[ord]--;
+
+ ord--;
+ cur = (start >> ord) & ~1U;
+ buddy = mb_find_buddy(e4b, ord, &max);
+ mb_clear_bit(cur, buddy);
+ mb_clear_bit(cur + 1, buddy);
+ e4b->bd_info->bb_counters[ord]++;
+ e4b->bd_info->bb_counters[ord]++;
+ }
+
+ mb_set_bits(sb_bgl_lock(EXT4_SB(e4b->bd_sb), ex->fe_group),
+ EXT4_MB_BITMAP(e4b), ex->fe_start, len0);
+ mb_check_buddy(e4b);
+
+ return ret;
+}
+
+/*
+ * Must be called under group lock!
+ */
+static void ext4_mb_use_best_found(struct ext4_allocation_context *ac,
+ struct ext4_buddy *e4b)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
+ int ret;
+
+ BUG_ON(ac->ac_b_ex.fe_group != e4b->bd_group);
+ BUG_ON(ac->ac_status == AC_STATUS_FOUND);
+
+ ac->ac_b_ex.fe_len = min(ac->ac_b_ex.fe_len, ac->ac_g_ex.fe_len);
+ ac->ac_b_ex.fe_logical = ac->ac_g_ex.fe_logical;
+ ret = mb_mark_used(e4b, &ac->ac_b_ex);
+
+ /* preallocation can change ac_b_ex, thus we store actually
+ * allocated blocks for history */
+ ac->ac_f_ex = ac->ac_b_ex;
+
+ ac->ac_status = AC_STATUS_FOUND;
+ ac->ac_tail = ret & 0xffff;
+ ac->ac_buddy = ret >> 16;
+
+ /* XXXXXXX: SUCH A HORRIBLE **CK */
+ /*FIXME!! Why ? */
+ ac->ac_bitmap_page = e4b->bd_bitmap_page;
+ get_page(ac->ac_bitmap_page);
+ ac->ac_buddy_page = e4b->bd_buddy_page;
+ get_page(ac->ac_buddy_page);
+
+ /* store last allocated for subsequent stream allocation */
+ if ((ac->ac_flags & EXT4_MB_HINT_DATA)) {
+ spin_lock(&sbi->s_md_lock);
+ sbi->s_mb_last_group = ac->ac_f_ex.fe_group;
+ sbi->s_mb_last_start = ac->ac_f_ex.fe_start;
+ spin_unlock(&sbi->s_md_lock);
+ }
+}
+
+/*
+ * regular allocator, for general purposes allocation
+ */
+
+static void ext4_mb_check_limits(struct ext4_allocation_context *ac,
+ struct ext4_buddy *e4b,
+ int finish_group)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
+ struct ext4_free_extent *bex = &ac->ac_b_ex;
+ struct ext4_free_extent *gex = &ac->ac_g_ex;
+ struct ext4_free_extent ex;
+ int max;
+
+ /*
+ * We don't want to scan for a whole year
+ */
+ if (ac->ac_found > sbi->s_mb_max_to_scan &&
+ !(ac->ac_flags & EXT4_MB_HINT_FIRST)) {
+ ac->ac_status = AC_STATUS_BREAK;
+ return;
+ }
+
+ /*
+ * Haven't found good chunk so far, let's continue
+ */
+ if (bex->fe_len < gex->fe_len)
+ return;
+
+ if ((finish_group || ac->ac_found > sbi->s_mb_min_to_scan)
+ && bex->fe_group == e4b->bd_group) {
+ /* recheck chunk's availability - we don't know
+ * when it was found (within this lock-unlock
+ * period or not) */
+ max = mb_find_extent(e4b, 0, bex->fe_start, gex->fe_len, &ex);
+ if (max >= gex->fe_len) {
+ ext4_mb_use_best_found(ac, e4b);
+ return;
+ }
+ }
+}
+
+/*
+ * The routine checks whether found extent is good enough. If it is,
+ * then the extent gets marked used and flag is set to the context
+ * to stop scanning. Otherwise, the extent is compared with the
+ * previous found extent and if new one is better, then it's stored
+ * in the context. Later, the best found extent will be used, if
+ * mballoc can't find good enough extent.
+ *
+ * FIXME: real allocation policy is to be designed yet!
+ */
+static void ext4_mb_measure_extent(struct ext4_allocation_context *ac,
+ struct ext4_free_extent *ex,
+ struct ext4_buddy *e4b)
+{
+ struct ext4_free_extent *bex = &ac->ac_b_ex;
+ struct ext4_free_extent *gex = &ac->ac_g_ex;
+
+ BUG_ON(ex->fe_len <= 0);
+ BUG_ON(ex->fe_len >= EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
+ BUG_ON(ex->fe_start >= EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
+ BUG_ON(ac->ac_status != AC_STATUS_CONTINUE);
+
+ ac->ac_found++;
+
+ /*
+ * The special case - take what you catch first
+ */
+ if (unlikely(ac->ac_flags & EXT4_MB_HINT_FIRST)) {
+ *bex = *ex;
+ ext4_mb_use_best_found(ac, e4b);
+ return;
+ }
+
+ /*
+ * Let's check whether the chuck is good enough
+ */
+ if (ex->fe_len == gex->fe_len) {
+ *bex = *ex;
+ ext4_mb_use_best_found(ac, e4b);
+ return;
+ }
+
+ /*
+ * If this is first found extent, just store it in the context
+ */
+ if (bex->fe_len == 0) {
+ *bex = *ex;
+ return;
+ }
+
+ /*
+ * If new found extent is better, store it in the context
+ */
+ if (bex->fe_len < gex->fe_len) {
+ /* if the request isn't satisfied, any found extent
+ * larger than previous best one is better */
+ if (ex->fe_len > bex->fe_len)
+ *bex = *ex;
+ } else if (ex->fe_len > gex->fe_len) {
+ /* if the request is satisfied, then we try to find
+ * an extent that still satisfy the request, but is
+ * smaller than previous one */
+ if (ex->fe_len < bex->fe_len)
+ *bex = *ex;
+ }
+
+ ext4_mb_check_limits(ac, e4b, 0);
+}
+
+static int ext4_mb_try_best_found(struct ext4_allocation_context *ac,
+ struct ext4_buddy *e4b)
+{
+ struct ext4_free_extent ex = ac->ac_b_ex;
+ ext4_group_t group = ex.fe_group;
+ int max;
+ int err;
+
+ BUG_ON(ex.fe_len <= 0);
+ err = ext4_mb_load_buddy(ac->ac_sb, group, e4b);
+ if (err)
+ return err;
+
+ ext4_lock_group(ac->ac_sb, group);
+ max = mb_find_extent(e4b, 0, ex.fe_start, ex.fe_len, &ex);
+
+ if (max > 0) {
+ ac->ac_b_ex = ex;
+ ext4_mb_use_best_found(ac, e4b);
+ }
+
+ ext4_unlock_group(ac->ac_sb, group);
+ ext4_mb_release_desc(e4b);
+
+ return 0;
+}
+
+static int ext4_mb_find_by_goal(struct ext4_allocation_context *ac,
+ struct ext4_buddy *e4b)
+{
+ ext4_group_t group = ac->ac_g_ex.fe_group;
+ int max;
+ int err;
+ struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
+ struct ext4_super_block *es = sbi->s_es;
+ struct ext4_free_extent ex;
+
+ if (!(ac->ac_flags & EXT4_MB_HINT_TRY_GOAL))
+ return 0;
+
+ err = ext4_mb_load_buddy(ac->ac_sb, group, e4b);
+ if (err)
+ return err;
+
+ ext4_lock_group(ac->ac_sb, group);
+ max = mb_find_extent(e4b, 0, ac->ac_g_ex.fe_start,
+ ac->ac_g_ex.fe_len, &ex);
+
+ if (max >= ac->ac_g_ex.fe_len && ac->ac_g_ex.fe_len == sbi->s_stripe) {
+ ext4_fsblk_t start;
+
+ start = (e4b->bd_group * EXT4_BLOCKS_PER_GROUP(ac->ac_sb)) +
+ ex.fe_start + le32_to_cpu(es->s_first_data_block);
+ /* use do_div to get remainder (would be 64-bit modulo) */
+ if (do_div(start, sbi->s_stripe) == 0) {
+ ac->ac_found++;
+ ac->ac_b_ex = ex;
+ ext4_mb_use_best_found(ac, e4b);
+ }
+ } else if (max >= ac->ac_g_ex.fe_len) {
+ BUG_ON(ex.fe_len <= 0);
+ BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group);
+ BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start);
+ ac->ac_found++;
+ ac->ac_b_ex = ex;
+ ext4_mb_use_best_found(ac, e4b);
+ } else if (max > 0 && (ac->ac_flags & EXT4_MB_HINT_MERGE)) {
+ /* Sometimes, caller may want to merge even small
+ * number of blocks to an existing extent */
+ BUG_ON(ex.fe_len <= 0);
+ BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group);
+ BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start);
+ ac->ac_found++;
+ ac->ac_b_ex = ex;
+ ext4_mb_use_best_found(ac, e4b);
+ }
+ ext4_unlock_group(ac->ac_sb, group);
+ ext4_mb_release_desc(e4b);
+
+ return 0;
+}
+
+/*
+ * The routine scans buddy structures (not bitmap!) from given order
+ * to max order and tries to find big enough chunk to satisfy the req
+ */
+static void ext4_mb_simple_scan_group(struct ext4_allocation_context *ac,
+ struct ext4_buddy *e4b)
+{
+ struct super_block *sb = ac->ac_sb;
+ struct ext4_group_info *grp = e4b->bd_info;
+ void *buddy;
+ int i;
+ int k;
+ int max;
+
+ BUG_ON(ac->ac_2order <= 0);
+ for (i = ac->ac_2order; i <= sb->s_blocksize_bits + 1; i++) {
+ if (grp->bb_counters[i] == 0)
+ continue;
+
+ buddy = mb_find_buddy(e4b, i, &max);
+ BUG_ON(buddy == NULL);
+
+ k = ext4_find_next_zero_bit(buddy, max, 0);
+ BUG_ON(k >= max);
+
+ ac->ac_found++;
+
+ ac->ac_b_ex.fe_len = 1 << i;
+ ac->ac_b_ex.fe_start = k << i;
+ ac->ac_b_ex.fe_group = e4b->bd_group;
+
+ ext4_mb_use_best_found(ac, e4b);
+
+ BUG_ON(ac->ac_b_ex.fe_len != ac->ac_g_ex.fe_len);
+
+ if (EXT4_SB(sb)->s_mb_stats)
+ atomic_inc(&EXT4_SB(sb)->s_bal_2orders);
+
+ break;
+ }
+}
+
+/*
+ * The routine scans the group and measures all found extents.
+ * In order to optimize scanning, caller must pass number of
+ * free blocks in the group, so the routine can know upper limit.
+ */
+static void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
+ struct ext4_buddy *e4b)
+{
+ struct super_block *sb = ac->ac_sb;
+ void *bitmap = EXT4_MB_BITMAP(e4b);
+ struct ext4_free_extent ex;
+ int i;
+ int free;
+
+ free = e4b->bd_info->bb_free;
+ BUG_ON(free <= 0);
+
+ i = e4b->bd_info->bb_first_free;
+
+ while (free && ac->ac_status == AC_STATUS_CONTINUE) {
+ i = ext4_find_next_zero_bit(bitmap,
+ EXT4_BLOCKS_PER_GROUP(sb), i);
+ if (i >= EXT4_BLOCKS_PER_GROUP(sb)) {
+ BUG_ON(free != 0);
+ break;
+ }
+
+ mb_find_extent(e4b, 0, i, ac->ac_g_ex.fe_len, &ex);
+ BUG_ON(ex.fe_len <= 0);
+ BUG_ON(free < ex.fe_len);
+
+ ext4_mb_measure_extent(ac, &ex, e4b);
+
+ i += ex.fe_len;
+ free -= ex.fe_len;
+ }
+
+ ext4_mb_check_limits(ac, e4b, 1);
+}
+
+/*
+ * This is a special case for storages like raid5
+ * we try to find stripe-aligned chunks for stripe-size requests
+ * XXX should do so at least for multiples of stripe size as well
+ */
+static void ext4_mb_scan_aligned(struct ext4_allocation_context *ac,
+ struct ext4_buddy *e4b)
+{
+ struct super_block *sb = ac->ac_sb;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ void *bitmap = EXT4_MB_BITMAP(e4b);
+ struct ext4_free_extent ex;
+ ext4_fsblk_t first_group_block;
+ ext4_fsblk_t a;
+ ext4_grpblk_t i;
+ int max;
+
+ BUG_ON(sbi->s_stripe == 0);
+
+ /* find first stripe-aligned block in group */
+ first_group_block = e4b->bd_group * EXT4_BLOCKS_PER_GROUP(sb)
+ + le32_to_cpu(sbi->s_es->s_first_data_block);
+ a = first_group_block + sbi->s_stripe - 1;
+ do_div(a, sbi->s_stripe);
+ i = (a * sbi->s_stripe) - first_group_block;
+
+ while (i < EXT4_BLOCKS_PER_GROUP(sb)) {
+ if (!mb_test_bit(i, bitmap)) {
+ max = mb_find_extent(e4b, 0, i, sbi->s_stripe, &ex);
+ if (max >= sbi->s_stripe) {
+ ac->ac_found++;
+ ac->ac_b_ex = ex;
+ ext4_mb_use_best_found(ac, e4b);
+ break;
+ }
+ }
+ i += sbi->s_stripe;
+ }
+}
+
+static int ext4_mb_good_group(struct ext4_allocation_context *ac,
+ ext4_group_t group, int cr)
+{
+ unsigned free, fragments;
+ unsigned i, bits;
+ struct ext4_group_desc *desc;
+ struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group);
+
+ BUG_ON(cr < 0 || cr >= 4);
+ BUG_ON(EXT4_MB_GRP_NEED_INIT(grp));
+
+ free = grp->bb_free;
+ fragments = grp->bb_fragments;
+ if (free == 0)
+ return 0;
+ if (fragments == 0)
+ return 0;
+
+ switch (cr) {
+ case 0:
+ BUG_ON(ac->ac_2order == 0);
+ /* If this group is uninitialized, skip it initially */
+ desc = ext4_get_group_desc(ac->ac_sb, group, NULL);
+ if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))
+ return 0;
+
+ bits = ac->ac_sb->s_blocksize_bits + 1;
+ for (i = ac->ac_2order; i <= bits; i++)
+ if (grp->bb_counters[i] > 0)
+ return 1;
+ break;
+ case 1:
+ if ((free / fragments) >= ac->ac_g_ex.fe_len)
+ return 1;
+ break;
+ case 2:
+ if (free >= ac->ac_g_ex.fe_len)
+ return 1;
+ break;
+ case 3:
+ return 1;
+ default:
+ BUG();
+ }
+
+ return 0;
+}
+
+static int ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
+{
+ ext4_group_t group;
+ ext4_group_t i;
+ int cr;
+ int err = 0;
+ int bsbits;
+ struct ext4_sb_info *sbi;
+ struct super_block *sb;
+ struct ext4_buddy e4b;
+ loff_t size, isize;
+
+ sb = ac->ac_sb;
+ sbi = EXT4_SB(sb);
+ BUG_ON(ac->ac_status == AC_STATUS_FOUND);
+
+ /* first, try the goal */
+ err = ext4_mb_find_by_goal(ac, &e4b);
+ if (err || ac->ac_status == AC_STATUS_FOUND)
+ goto out;
+
+ if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY))
+ goto out;
+
+ /*
+ * ac->ac2_order is set only if the fe_len is a power of 2
+ * if ac2_order is set we also set criteria to 0 so that we
+ * try exact allocation using buddy.
+ */
+ i = fls(ac->ac_g_ex.fe_len);
+ ac->ac_2order = 0;
+ /*
+ * We search using buddy data only if the order of the request
+ * is greater than equal to the sbi_s_mb_order2_reqs
+ * You can tune it via /proc/fs/ext4/<partition>/order2_req
+ */
+ if (i >= sbi->s_mb_order2_reqs) {
+ /*
+ * This should tell if fe_len is exactly power of 2
+ */
+ if ((ac->ac_g_ex.fe_len & (~(1 << (i - 1)))) == 0)
+ ac->ac_2order = i - 1;
+ }
+
+ bsbits = ac->ac_sb->s_blocksize_bits;
+ /* if stream allocation is enabled, use global goal */
+ size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
+ isize = i_size_read(ac->ac_inode) >> bsbits;
+ if (size < isize)
+ size = isize;
+
+ if (size < sbi->s_mb_stream_request &&
+ (ac->ac_flags & EXT4_MB_HINT_DATA)) {
+ /* TBD: may be hot point */
+ spin_lock(&sbi->s_md_lock);
+ ac->ac_g_ex.fe_group = sbi->s_mb_last_group;
+ ac->ac_g_ex.fe_start = sbi->s_mb_last_start;
+ spin_unlock(&sbi->s_md_lock);
+ }
+
+ /* searching for the right group start from the goal value specified */
+ group = ac->ac_g_ex.fe_group;
+
+ /* Let's just scan groups to find more-less suitable blocks */
+ cr = ac->ac_2order ? 0 : 1;
+ /*
+ * cr == 0 try to get exact allocation,
+ * cr == 3 try to get anything
+ */
+repeat:
+ for (; cr < 4 && ac->ac_status == AC_STATUS_CONTINUE; cr++) {
+ ac->ac_criteria = cr;
+ for (i = 0; i < EXT4_SB(sb)->s_groups_count; group++, i++) {
+ struct ext4_group_info *grp;
+ struct ext4_group_desc *desc;
+
+ if (group == EXT4_SB(sb)->s_groups_count)
+ group = 0;
+
+ /* quick check to skip empty groups */
+ grp = ext4_get_group_info(ac->ac_sb, group);
+ if (grp->bb_free == 0)
+ continue;
+
+ /*
+ * if the group is already init we check whether it is
+ * a good group and if not we don't load the buddy
+ */
+ if (EXT4_MB_GRP_NEED_INIT(grp)) {
+ /*
+ * we need full data about the group
+ * to make a good selection
+ */
+ err = ext4_mb_load_buddy(sb, group, &e4b);
+ if (err)
+ goto out;
+ ext4_mb_release_desc(&e4b);
+ }
+
+ /*
+ * If the particular group doesn't satisfy our
+ * criteria we continue with the next group
+ */
+ if (!ext4_mb_good_group(ac, group, cr))
+ continue;
+
+ err = ext4_mb_load_buddy(sb, group, &e4b);
+ if (err)
+ goto out;
+
+ ext4_lock_group(sb, group);
+ if (!ext4_mb_good_group(ac, group, cr)) {
+ /* someone did allocation from this group */
+ ext4_unlock_group(sb, group);
+ ext4_mb_release_desc(&e4b);
+ continue;
+ }
+
+ ac->ac_groups_scanned++;
+ desc = ext4_get_group_desc(sb, group, NULL);
+ if (cr == 0 || (desc->bg_flags &
+ cpu_to_le16(EXT4_BG_BLOCK_UNINIT) &&
+ ac->ac_2order != 0))
+ ext4_mb_simple_scan_group(ac, &e4b);
+ else if (cr == 1 &&
+ ac->ac_g_ex.fe_len == sbi->s_stripe)
+ ext4_mb_scan_aligned(ac, &e4b);
+ else
+ ext4_mb_complex_scan_group(ac, &e4b);
+
+ ext4_unlock_group(sb, group);
+ ext4_mb_release_desc(&e4b);
+
+ if (ac->ac_status != AC_STATUS_CONTINUE)
+ break;
+ }
+ }
+
+ if (ac->ac_b_ex.fe_len > 0 && ac->ac_status != AC_STATUS_FOUND &&
+ !(ac->ac_flags & EXT4_MB_HINT_FIRST)) {
+ /*
+ * We've been searching too long. Let's try to allocate
+ * the best chunk we've found so far
+ */
+
+ ext4_mb_try_best_found(ac, &e4b);
+ if (ac->ac_status != AC_STATUS_FOUND) {
+ /*
+ * Someone more lucky has already allocated it.
+ * The only thing we can do is just take first
+ * found block(s)
+ printk(KERN_DEBUG "EXT4-fs: someone won our chunk\n");
+ */
+ ac->ac_b_ex.fe_group = 0;
+ ac->ac_b_ex.fe_start = 0;
+ ac->ac_b_ex.fe_len = 0;
+ ac->ac_status = AC_STATUS_CONTINUE;
+ ac->ac_flags |= EXT4_MB_HINT_FIRST;
+ cr = 3;
+ atomic_inc(&sbi->s_mb_lost_chunks);
+ goto repeat;
+ }
+ }
+out:
+ return err;
+}
+
+#ifdef EXT4_MB_HISTORY
+struct ext4_mb_proc_session {
+ struct ext4_mb_history *history;
+ struct super_block *sb;
+ int start;
+ int max;
+};
+
+static void *ext4_mb_history_skip_empty(struct ext4_mb_proc_session *s,
+ struct ext4_mb_history *hs,
+ int first)
+{
+ if (hs == s->history + s->max)
+ hs = s->history;
+ if (!first && hs == s->history + s->start)
+ return NULL;
+ while (hs->orig.fe_len == 0) {
+ hs++;
+ if (hs == s->history + s->max)
+ hs = s->history;
+ if (hs == s->history + s->start)
+ return NULL;
+ }
+ return hs;
+}
+
+static void *ext4_mb_seq_history_start(struct seq_file *seq, loff_t *pos)
+{
+ struct ext4_mb_proc_session *s = seq->private;
+ struct ext4_mb_history *hs;
+ int l = *pos;
+
+ if (l == 0)
+ return SEQ_START_TOKEN;
+ hs = ext4_mb_history_skip_empty(s, s->history + s->start, 1);
+ if (!hs)
+ return NULL;
+ while (--l && (hs = ext4_mb_history_skip_empty(s, ++hs, 0)) != NULL);
+ return hs;
+}
+
+static void *ext4_mb_seq_history_next(struct seq_file *seq, void *v,
+ loff_t *pos)
+{
+ struct ext4_mb_proc_session *s = seq->private;
+ struct ext4_mb_history *hs = v;
+
+ ++*pos;
+ if (v == SEQ_START_TOKEN)
+ return ext4_mb_history_skip_empty(s, s->history + s->start, 1);
+ else
+ return ext4_mb_history_skip_empty(s, ++hs, 0);
+}
+
+static int ext4_mb_seq_history_show(struct seq_file *seq, void *v)
+{
+ char buf[25], buf2[25], buf3[25], *fmt;
+ struct ext4_mb_history *hs = v;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(seq, "%-5s %-8s %-23s %-23s %-23s %-5s "
+ "%-5s %-2s %-5s %-5s %-5s %-6s\n",
+ "pid", "inode", "original", "goal", "result", "found",
+ "grps", "cr", "flags", "merge", "tail", "broken");
+ return 0;
+ }
+
+ if (hs->op == EXT4_MB_HISTORY_ALLOC) {
+ fmt = "%-5u %-8u %-23s %-23s %-23s %-5u %-5u %-2u "
+ "%-5u %-5s %-5u %-6u\n";
+ sprintf(buf2, "%lu/%d/%u@%u", hs->result.fe_group,
+ hs->result.fe_start, hs->result.fe_len,
+ hs->result.fe_logical);
+ sprintf(buf, "%lu/%d/%u@%u", hs->orig.fe_group,
+ hs->orig.fe_start, hs->orig.fe_len,
+ hs->orig.fe_logical);
+ sprintf(buf3, "%lu/%d/%u@%u", hs->goal.fe_group,
+ hs->goal.fe_start, hs->goal.fe_len,
+ hs->goal.fe_logical);
+ seq_printf(seq, fmt, hs->pid, hs->ino, buf, buf3, buf2,
+ hs->found, hs->groups, hs->cr, hs->flags,
+ hs->merged ? "M" : "", hs->tail,
+ hs->buddy ? 1 << hs->buddy : 0);
+ } else if (hs->op == EXT4_MB_HISTORY_PREALLOC) {
+ fmt = "%-5u %-8u %-23s %-23s %-23s\n";
+ sprintf(buf2, "%lu/%d/%u@%u", hs->result.fe_group,
+ hs->result.fe_start, hs->result.fe_len,
+ hs->result.fe_logical);
+ sprintf(buf, "%lu/%d/%u@%u", hs->orig.fe_group,
+ hs->orig.fe_start, hs->orig.fe_len,
+ hs->orig.fe_logical);
+ seq_printf(seq, fmt, hs->pid, hs->ino, buf, "", buf2);
+ } else if (hs->op == EXT4_MB_HISTORY_DISCARD) {
+ sprintf(buf2, "%lu/%d/%u", hs->result.fe_group,
+ hs->result.fe_start, hs->result.fe_len);
+ seq_printf(seq, "%-5u %-8u %-23s discard\n",
+ hs->pid, hs->ino, buf2);
+ } else if (hs->op == EXT4_MB_HISTORY_FREE) {
+ sprintf(buf2, "%lu/%d/%u", hs->result.fe_group,
+ hs->result.fe_start, hs->result.fe_len);
+ seq_printf(seq, "%-5u %-8u %-23s free\n",
+ hs->pid, hs->ino, buf2);
+ }
+ return 0;
+}
+
+static void ext4_mb_seq_history_stop(struct seq_file *seq, void *v)
+{
+}
+
+static struct seq_operations ext4_mb_seq_history_ops = {
+ .start = ext4_mb_seq_history_start,
+ .next = ext4_mb_seq_history_next,
+ .stop = ext4_mb_seq_history_stop,
+ .show = ext4_mb_seq_history_show,
+};
+
+static int ext4_mb_seq_history_open(struct inode *inode, struct file *file)
+{
+ struct super_block *sb = PDE(inode)->data;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_mb_proc_session *s;
+ int rc;
+ int size;
+
+ s = kmalloc(sizeof(*s), GFP_KERNEL);
+ if (s == NULL)
+ return -ENOMEM;
+ s->sb = sb;
+ size = sizeof(struct ext4_mb_history) * sbi->s_mb_history_max;
+ s->history = kmalloc(size, GFP_KERNEL);
+ if (s->history == NULL) {
+ kfree(s);
+ return -ENOMEM;
+ }
+
+ spin_lock(&sbi->s_mb_history_lock);
+ memcpy(s->history, sbi->s_mb_history, size);
+ s->max = sbi->s_mb_history_max;
+ s->start = sbi->s_mb_history_cur % s->max;
+ spin_unlock(&sbi->s_mb_history_lock);
+
+ rc = seq_open(file, &ext4_mb_seq_history_ops);
+ if (rc == 0) {
+ struct seq_file *m = (struct seq_file *)file->private_data;
+ m->private = s;
+ } else {
+ kfree(s->history);
+ kfree(s);
+ }
+ return rc;
+
+}
+
+static int ext4_mb_seq_history_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = (struct seq_file *)file->private_data;
+ struct ext4_mb_proc_session *s = seq->private;
+ kfree(s->history);
+ kfree(s);
+ return seq_release(inode, file);
+}
+
+static ssize_t ext4_mb_seq_history_write(struct file *file,
+ const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *seq = (struct seq_file *)file->private_data;
+ struct ext4_mb_proc_session *s = seq->private;
+ struct super_block *sb = s->sb;
+ char str[32];
+ int value;
+
+ if (count >= sizeof(str)) {
+ printk(KERN_ERR "EXT4-fs: %s string too long, max %u bytes\n",
+ "mb_history", (int)sizeof(str));
+ return -EOVERFLOW;
+ }
+
+ if (copy_from_user(str, buffer, count))
+ return -EFAULT;
+
+ value = simple_strtol(str, NULL, 0);
+ if (value < 0)
+ return -ERANGE;
+ EXT4_SB(sb)->s_mb_history_filter = value;
+
+ return count;
+}
+
+static struct file_operations ext4_mb_seq_history_fops = {
+ .owner = THIS_MODULE,
+ .open = ext4_mb_seq_history_open,
+ .read = seq_read,
+ .write = ext4_mb_seq_history_write,
+ .llseek = seq_lseek,
+ .release = ext4_mb_seq_history_release,
+};
+
+static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos)
+{
+ struct super_block *sb = seq->private;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ ext4_group_t group;
+
+ if (*pos < 0 || *pos >= sbi->s_groups_count)
+ return NULL;
+
+ group = *pos + 1;
+ return (void *) group;
+}
+
+static void *ext4_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct super_block *sb = seq->private;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ ext4_group_t group;
+
+ ++*pos;
+ if (*pos < 0 || *pos >= sbi->s_groups_count)
+ return NULL;
+ group = *pos + 1;
+ return (void *) group;;
+}
+
+static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
+{
+ struct super_block *sb = seq->private;
+ long group = (long) v;
+ int i;
+ int err;
+ struct ext4_buddy e4b;
+ struct sg {
+ struct ext4_group_info info;
+ unsigned short counters[16];
+ } sg;
+
+ group--;
+ if (group == 0)
+ seq_printf(seq, "#%-5s: %-5s %-5s %-5s "
+ "[ %-5s %-5s %-5s %-5s %-5s %-5s %-5s "
+ "%-5s %-5s %-5s %-5s %-5s %-5s %-5s ]\n",
+ "group", "free", "frags", "first",
+ "2^0", "2^1", "2^2", "2^3", "2^4", "2^5", "2^6",
+ "2^7", "2^8", "2^9", "2^10", "2^11", "2^12", "2^13");
+
+ i = (sb->s_blocksize_bits + 2) * sizeof(sg.info.bb_counters[0]) +
+ sizeof(struct ext4_group_info);
+ err = ext4_mb_load_buddy(sb, group, &e4b);
+ if (err) {
+ seq_printf(seq, "#%-5lu: I/O error\n", group);
+ return 0;
+ }
+ ext4_lock_group(sb, group);
+ memcpy(&sg, ext4_get_group_info(sb, group), i);
+ ext4_unlock_group(sb, group);
+ ext4_mb_release_desc(&e4b);
+
+ seq_printf(seq, "#%-5lu: %-5u %-5u %-5u [", group, sg.info.bb_free,
+ sg.info.bb_fragments, sg.info.bb_first_free);
+ for (i = 0; i <= 13; i++)
+ seq_printf(seq, " %-5u", i <= sb->s_blocksize_bits + 1 ?
+ sg.info.bb_counters[i] : 0);
+ seq_printf(seq, " ]\n");
+
+ return 0;
+}
+
+static void ext4_mb_seq_groups_stop(struct seq_file *seq, void *v)
+{
+}
+
+static struct seq_operations ext4_mb_seq_groups_ops = {
+ .start = ext4_mb_seq_groups_start,
+ .next = ext4_mb_seq_groups_next,
+ .stop = ext4_mb_seq_groups_stop,
+ .show = ext4_mb_seq_groups_show,
+};
+
+static int ext4_mb_seq_groups_open(struct inode *inode, struct file *file)
+{
+ struct super_block *sb = PDE(inode)->data;
+ int rc;
+
+ rc = seq_open(file, &ext4_mb_seq_groups_ops);
+ if (rc == 0) {
+ struct seq_file *m = (struct seq_file *)file->private_data;
+ m->private = sb;
+ }
+ return rc;
+
+}
+
+static struct file_operations ext4_mb_seq_groups_fops = {
+ .owner = THIS_MODULE,
+ .open = ext4_mb_seq_groups_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static void ext4_mb_history_release(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+ remove_proc_entry("mb_groups", sbi->s_mb_proc);
+ remove_proc_entry("mb_history", sbi->s_mb_proc);
+
+ kfree(sbi->s_mb_history);
+}
+
+static void ext4_mb_history_init(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ int i;
+
+ if (sbi->s_mb_proc != NULL) {
+ struct proc_dir_entry *p;
+ p = create_proc_entry("mb_history", S_IRUGO, sbi->s_mb_proc);
+ if (p) {
+ p->proc_fops = &ext4_mb_seq_history_fops;
+ p->data = sb;
+ }
+ p = create_proc_entry("mb_groups", S_IRUGO, sbi->s_mb_proc);
+ if (p) {
+ p->proc_fops = &ext4_mb_seq_groups_fops;
+ p->data = sb;
+ }
+ }
+
+ sbi->s_mb_history_max = 1000;
+ sbi->s_mb_history_cur = 0;
+ spin_lock_init(&sbi->s_mb_history_lock);
+ i = sbi->s_mb_history_max * sizeof(struct ext4_mb_history);
+ sbi->s_mb_history = kmalloc(i, GFP_KERNEL);
+ if (likely(sbi->s_mb_history != NULL))
+ memset(sbi->s_mb_history, 0, i);
+ /* if we can't allocate history, then we simple won't use it */
+}
+
+static void ext4_mb_store_history(struct ext4_allocation_context *ac)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
+ struct ext4_mb_history h;
+
+ if (unlikely(sbi->s_mb_history == NULL))
+ return;
+
+ if (!(ac->ac_op & sbi->s_mb_history_filter))
+ return;
+
+ h.op = ac->ac_op;
+ h.pid = current->pid;
+ h.ino = ac->ac_inode ? ac->ac_inode->i_ino : 0;
+ h.orig = ac->ac_o_ex;
+ h.result = ac->ac_b_ex;
+ h.flags = ac->ac_flags;
+ h.found = ac->ac_found;
+ h.groups = ac->ac_groups_scanned;
+ h.cr = ac->ac_criteria;
+ h.tail = ac->ac_tail;
+ h.buddy = ac->ac_buddy;
+ h.merged = 0;
+ if (ac->ac_op == EXT4_MB_HISTORY_ALLOC) {
+ if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start &&
+ ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group)
+ h.merged = 1;
+ h.goal = ac->ac_g_ex;
+ h.result = ac->ac_f_ex;
+ }
+
+ spin_lock(&sbi->s_mb_history_lock);
+ memcpy(sbi->s_mb_history + sbi->s_mb_history_cur, &h, sizeof(h));
+ if (++sbi->s_mb_history_cur >= sbi->s_mb_history_max)
+ sbi->s_mb_history_cur = 0;
+ spin_unlock(&sbi->s_mb_history_lock);
+}
+
+#else
+#define ext4_mb_history_release(sb)
+#define ext4_mb_history_init(sb)
+#endif
+
+static int ext4_mb_init_backend(struct super_block *sb)
+{
+ ext4_group_t i;
+ int j, len, metalen;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ int num_meta_group_infos =
+ (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) >>
+ EXT4_DESC_PER_BLOCK_BITS(sb);
+ struct ext4_group_info **meta_group_info;
+
+ /* An 8TB filesystem with 64-bit pointers requires a 4096 byte
+ * kmalloc. A 128kb malloc should suffice for a 256TB filesystem.
+ * So a two level scheme suffices for now. */
+ sbi->s_group_info = kmalloc(sizeof(*sbi->s_group_info) *
+ num_meta_group_infos, GFP_KERNEL);
+ if (sbi->s_group_info == NULL) {
+ printk(KERN_ERR "EXT4-fs: can't allocate buddy meta group\n");
+ return -ENOMEM;
+ }
+ sbi->s_buddy_cache = new_inode(sb);
+ if (sbi->s_buddy_cache == NULL) {
+ printk(KERN_ERR "EXT4-fs: can't get new inode\n");
+ goto err_freesgi;
+ }
+ EXT4_I(sbi->s_buddy_cache)->i_disksize = 0;
+
+ metalen = sizeof(*meta_group_info) << EXT4_DESC_PER_BLOCK_BITS(sb);
+ for (i = 0; i < num_meta_group_infos; i++) {
+ if ((i + 1) == num_meta_group_infos)
+ metalen = sizeof(*meta_group_info) *
+ (sbi->s_groups_count -
+ (i << EXT4_DESC_PER_BLOCK_BITS(sb)));
+ meta_group_info = kmalloc(metalen, GFP_KERNEL);
+ if (meta_group_info == NULL) {
+ printk(KERN_ERR "EXT4-fs: can't allocate mem for a "
+ "buddy group\n");
+ goto err_freemeta;
+ }
+ sbi->s_group_info[i] = meta_group_info;
+ }
+
+ /*
+ * calculate needed size. if change bb_counters size,
+ * don't forget about ext4_mb_generate_buddy()
+ */
+ len = sizeof(struct ext4_group_info);
+ len += sizeof(unsigned short) * (sb->s_blocksize_bits + 2);
+ for (i = 0; i < sbi->s_groups_count; i++) {
+ struct ext4_group_desc *desc;
+
+ meta_group_info =
+ sbi->s_group_info[i >> EXT4_DESC_PER_BLOCK_BITS(sb)];
+ j = i & (EXT4_DESC_PER_BLOCK(sb) - 1);
+
+ meta_group_info[j] = kzalloc(len, GFP_KERNEL);
+ if (meta_group_info[j] == NULL) {
+ printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n");
+ i--;
+ goto err_freebuddy;
+ }
+ desc = ext4_get_group_desc(sb, i, NULL);
+ if (desc == NULL) {
+ printk(KERN_ERR
+ "EXT4-fs: can't read descriptor %lu\n", i);
+ goto err_freebuddy;
+ }
+ memset(meta_group_info[j], 0, len);
+ set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT,
+ &(meta_group_info[j]->bb_state));
+
+ /*
+ * initialize bb_free to be able to skip
+ * empty groups without initialization
+ */
+ if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
+ meta_group_info[j]->bb_free =
+ ext4_free_blocks_after_init(sb, i, desc);
+ } else {
+ meta_group_info[j]->bb_free =
+ le16_to_cpu(desc->bg_free_blocks_count);
+ }
+
+ INIT_LIST_HEAD(&meta_group_info[j]->bb_prealloc_list);
+
+#ifdef DOUBLE_CHECK
+ {
+ struct buffer_head *bh;
+ meta_group_info[j]->bb_bitmap =
+ kmalloc(sb->s_blocksize, GFP_KERNEL);
+ BUG_ON(meta_group_info[j]->bb_bitmap == NULL);
+ bh = read_block_bitmap(sb, i);
+ BUG_ON(bh == NULL);
+ memcpy(meta_group_info[j]->bb_bitmap, bh->b_data,
+ sb->s_blocksize);
+ put_bh(bh);
+ }
+#endif
+
+ }
+
+ return 0;
+
+err_freebuddy:
+ while (i >= 0) {
+ kfree(ext4_get_group_info(sb, i));
+ i--;
+ }
+ i = num_meta_group_infos;
+err_freemeta:
+ while (--i >= 0)
+ kfree(sbi->s_group_info[i]);
+ iput(sbi->s_buddy_cache);
+err_freesgi:
+ kfree(sbi->s_group_info);
+ return -ENOMEM;
+}
+
+int ext4_mb_init(struct super_block *sb, int needs_recovery)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ unsigned i;
+ unsigned offset;
+ unsigned max;
+
+ if (!test_opt(sb, MBALLOC))
+ return 0;
+
+ i = (sb->s_blocksize_bits + 2) * sizeof(unsigned short);
+
+ sbi->s_mb_offsets = kmalloc(i, GFP_KERNEL);
+ if (sbi->s_mb_offsets == NULL) {
+ clear_opt(sbi->s_mount_opt, MBALLOC);
+ return -ENOMEM;
+ }
+ sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL);
+ if (sbi->s_mb_maxs == NULL) {
+ clear_opt(sbi->s_mount_opt, MBALLOC);
+ kfree(sbi->s_mb_maxs);
+ return -ENOMEM;
+ }
+
+ /* order 0 is regular bitmap */
+ sbi->s_mb_maxs[0] = sb->s_blocksize << 3;
+ sbi->s_mb_offsets[0] = 0;
+
+ i = 1;
+ offset = 0;
+ max = sb->s_blocksize << 2;
+ do {
+ sbi->s_mb_offsets[i] = offset;
+ sbi->s_mb_maxs[i] = max;
+ offset += 1 << (sb->s_blocksize_bits - i);
+ max = max >> 1;
+ i++;
+ } while (i <= sb->s_blocksize_bits + 1);
+
+ /* init file for buddy data */
+ i = ext4_mb_init_backend(sb);
+ if (i) {
+ clear_opt(sbi->s_mount_opt, MBALLOC);
+ kfree(sbi->s_mb_offsets);
+ kfree(sbi->s_mb_maxs);
+ return i;
+ }
+
+ spin_lock_init(&sbi->s_md_lock);
+ INIT_LIST_HEAD(&sbi->s_active_transaction);
+ INIT_LIST_HEAD(&sbi->s_closed_transaction);
+ INIT_LIST_HEAD(&sbi->s_committed_transaction);
+ spin_lock_init(&sbi->s_bal_lock);
+
+ sbi->s_mb_max_to_scan = MB_DEFAULT_MAX_TO_SCAN;
+ sbi->s_mb_min_to_scan = MB_DEFAULT_MIN_TO_SCAN;
+ sbi->s_mb_stats = MB_DEFAULT_STATS;
+ sbi->s_mb_stream_request = MB_DEFAULT_STREAM_THRESHOLD;
+ sbi->s_mb_order2_reqs = MB_DEFAULT_ORDER2_REQS;
+ sbi->s_mb_history_filter = EXT4_MB_HISTORY_DEFAULT;
+ sbi->s_mb_group_prealloc = MB_DEFAULT_GROUP_PREALLOC;
+
+ i = sizeof(struct ext4_locality_group) * NR_CPUS;
+ sbi->s_locality_groups = kmalloc(i, GFP_KERNEL);
+ if (sbi->s_locality_groups == NULL) {
+ clear_opt(sbi->s_mount_opt, MBALLOC);
+ kfree(sbi->s_mb_offsets);
+ kfree(sbi->s_mb_maxs);
+ return -ENOMEM;
+ }
+ for (i = 0; i < NR_CPUS; i++) {
+ struct ext4_locality_group *lg;
+ lg = &sbi->s_locality_groups[i];
+ mutex_init(&lg->lg_mutex);
+ INIT_LIST_HEAD(&lg->lg_prealloc_list);
+ spin_lock_init(&lg->lg_prealloc_lock);
+ }
+
+ ext4_mb_init_per_dev_proc(sb);
+ ext4_mb_history_init(sb);
+
+ printk("EXT4-fs: mballoc enabled\n");
+ return 0;
+}
+
+/* need to called with ext4 group lock (ext4_lock_group) */
+static void ext4_mb_cleanup_pa(struct ext4_group_info *grp)
+{
+ struct ext4_prealloc_space *pa;
+ struct list_head *cur, *tmp;
+ int count = 0;
+
+ list_for_each_safe(cur, tmp, &grp->bb_prealloc_list) {
+ pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list);
+ list_del(&pa->pa_group_list);
+ count++;
+ kfree(pa);
+ }
+ if (count)
+ mb_debug("mballoc: %u PAs left\n", count);
+
+}
+
+int ext4_mb_release(struct super_block *sb)
+{
+ ext4_group_t i;
+ int num_meta_group_infos;
+ struct ext4_group_info *grinfo;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+ if (!test_opt(sb, MBALLOC))
+ return 0;
+
+ /* release freed, non-committed blocks */
+ spin_lock(&sbi->s_md_lock);
+ list_splice_init(&sbi->s_closed_transaction,
+ &sbi->s_committed_transaction);
+ list_splice_init(&sbi->s_active_transaction,
+ &sbi->s_committed_transaction);
+ spin_unlock(&sbi->s_md_lock);
+ ext4_mb_free_committed_blocks(sb);
+
+ if (sbi->s_group_info) {
+ for (i = 0; i < sbi->s_groups_count; i++) {
+ grinfo = ext4_get_group_info(sb, i);
+#ifdef DOUBLE_CHECK
+ kfree(grinfo->bb_bitmap);
+#endif
+ ext4_lock_group(sb, i);
+ ext4_mb_cleanup_pa(grinfo);
+ ext4_unlock_group(sb, i);
+ kfree(grinfo);
+ }
+ num_meta_group_infos = (sbi->s_groups_count +
+ EXT4_DESC_PER_BLOCK(sb) - 1) >>
+ EXT4_DESC_PER_BLOCK_BITS(sb);
+ for (i = 0; i < num_meta_group_infos; i++)
+ kfree(sbi->s_group_info[i]);
+ kfree(sbi->s_group_info);
+ }
+ kfree(sbi->s_mb_offsets);
+ kfree(sbi->s_mb_maxs);
+ if (sbi->s_buddy_cache)
+ iput(sbi->s_buddy_cache);
+ if (sbi->s_mb_stats) {
+ printk(KERN_INFO
+ "EXT4-fs: mballoc: %u blocks %u reqs (%u success)\n",
+ atomic_read(&sbi->s_bal_allocated),
+ atomic_read(&sbi->s_bal_reqs),
+ atomic_read(&sbi->s_bal_success));
+ printk(KERN_INFO
+ "EXT4-fs: mballoc: %u extents scanned, %u goal hits, "
+ "%u 2^N hits, %u breaks, %u lost\n",
+ atomic_read(&sbi->s_bal_ex_scanned),
+ atomic_read(&sbi->s_bal_goals),
+ atomic_read(&sbi->s_bal_2orders),
+ atomic_read(&sbi->s_bal_breaks),
+ atomic_read(&sbi->s_mb_lost_chunks));
+ printk(KERN_INFO
+ "EXT4-fs: mballoc: %lu generated and it took %Lu\n",
+ sbi->s_mb_buddies_generated++,
+ sbi->s_mb_generation_time);
+ printk(KERN_INFO
+ "EXT4-fs: mballoc: %u preallocated, %u discarded\n",
+ atomic_read(&sbi->s_mb_preallocated),
+ atomic_read(&sbi->s_mb_discarded));
+ }
+
+ kfree(sbi->s_locality_groups);
+
+ ext4_mb_history_release(sb);
+ ext4_mb_destroy_per_dev_proc(sb);
+
+ return 0;
+}
+
+static void ext4_mb_free_committed_blocks(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ int err;
+ int i;
+ int count = 0;
+ int count2 = 0;
+ struct ext4_free_metadata *md;
+ struct ext4_buddy e4b;
+
+ if (list_empty(&sbi->s_committed_transaction))
+ return;
+
+ /* there is committed blocks to be freed yet */
+ do {
+ /* get next array of blocks */
+ md = NULL;
+ spin_lock(&sbi->s_md_lock);
+ if (!list_empty(&sbi->s_committed_transaction)) {
+ md = list_entry(sbi->s_committed_transaction.next,
+ struct ext4_free_metadata, list);
+ list_del(&md->list);
+ }
+ spin_unlock(&sbi->s_md_lock);
+
+ if (md == NULL)
+ break;
+
+ mb_debug("gonna free %u blocks in group %lu (0x%p):",
+ md->num, md->group, md);
+
+ err = ext4_mb_load_buddy(sb, md->group, &e4b);
+ /* we expect to find existing buddy because it's pinned */
+ BUG_ON(err != 0);
+
+ /* there are blocks to put in buddy to make them really free */
+ count += md->num;
+ count2++;
+ ext4_lock_group(sb, md->group);
+ for (i = 0; i < md->num; i++) {
+ mb_debug(" %u", md->blocks[i]);
+ err = mb_free_blocks(NULL, &e4b, md->blocks[i], 1);
+ BUG_ON(err != 0);
+ }
+ mb_debug("\n");
+ ext4_unlock_group(sb, md->group);
+
+ /* balance refcounts from ext4_mb_free_metadata() */
+ page_cache_release(e4b.bd_buddy_page);
+ page_cache_release(e4b.bd_bitmap_page);
+
+ kfree(md);
+ ext4_mb_release_desc(&e4b);
+
+ } while (md);
+
+ mb_debug("freed %u blocks in %u structures\n", count, count2);
+}
+
+#define EXT4_ROOT "ext4"
+#define EXT4_MB_STATS_NAME "stats"
+#define EXT4_MB_MAX_TO_SCAN_NAME "max_to_scan"
+#define EXT4_MB_MIN_TO_SCAN_NAME "min_to_scan"
+#define EXT4_MB_ORDER2_REQ "order2_req"
+#define EXT4_MB_STREAM_REQ "stream_req"
+#define EXT4_MB_GROUP_PREALLOC "group_prealloc"
+
+
+
+#define MB_PROC_VALUE_READ(name) \
+static int ext4_mb_read_##name(char *page, char **start, \
+ off_t off, int count, int *eof, void *data) \
+{ \
+ struct ext4_sb_info *sbi = data; \
+ int len; \
+ *eof = 1; \
+ if (off != 0) \
+ return 0; \
+ len = sprintf(page, "%ld\n", sbi->s_mb_##name); \
+ *start = page; \
+ return len; \
+}
+
+#define MB_PROC_VALUE_WRITE(name) \
+static int ext4_mb_write_##name(struct file *file, \
+ const char __user *buf, unsigned long cnt, void *data) \
+{ \
+ struct ext4_sb_info *sbi = data; \
+ char str[32]; \
+ long value; \
+ if (cnt >= sizeof(str)) \
+ return -EINVAL; \
+ if (copy_from_user(str, buf, cnt)) \
+ return -EFAULT; \
+ value = simple_strtol(str, NULL, 0); \
+ if (value <= 0) \
+ return -ERANGE; \
+ sbi->s_mb_##name = value; \
+ return cnt; \
+}
+
+MB_PROC_VALUE_READ(stats);
+MB_PROC_VALUE_WRITE(stats);
+MB_PROC_VALUE_READ(max_to_scan);
+MB_PROC_VALUE_WRITE(max_to_scan);
+MB_PROC_VALUE_READ(min_to_scan);
+MB_PROC_VALUE_WRITE(min_to_scan);
+MB_PROC_VALUE_READ(order2_reqs);
+MB_PROC_VALUE_WRITE(order2_reqs);
+MB_PROC_VALUE_READ(stream_request);
+MB_PROC_VALUE_WRITE(stream_request);
+MB_PROC_VALUE_READ(group_prealloc);
+MB_PROC_VALUE_WRITE(group_prealloc);
+
+#define MB_PROC_HANDLER(name, var) \
+do { \
+ proc = create_proc_entry(name, mode, sbi->s_mb_proc); \
+ if (proc == NULL) { \
+ printk(KERN_ERR "EXT4-fs: can't to create %s\n", name); \
+ goto err_out; \
+ } \
+ proc->data = sbi; \
+ proc->read_proc = ext4_mb_read_##var ; \
+ proc->write_proc = ext4_mb_write_##var; \
+} while (0)
+
+static int ext4_mb_init_per_dev_proc(struct super_block *sb)
+{
+ mode_t mode = S_IFREG | S_IRUGO | S_IWUSR;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct proc_dir_entry *proc;
+ char devname[64];
+
+ snprintf(devname, sizeof(devname) - 1, "%s",
+ bdevname(sb->s_bdev, devname));
+ sbi->s_mb_proc = proc_mkdir(devname, proc_root_ext4);
+
+ MB_PROC_HANDLER(EXT4_MB_STATS_NAME, stats);
+ MB_PROC_HANDLER(EXT4_MB_MAX_TO_SCAN_NAME, max_to_scan);
+ MB_PROC_HANDLER(EXT4_MB_MIN_TO_SCAN_NAME, min_to_scan);
+ MB_PROC_HANDLER(EXT4_MB_ORDER2_REQ, order2_reqs);
+ MB_PROC_HANDLER(EXT4_MB_STREAM_REQ, stream_request);
+ MB_PROC_HANDLER(EXT4_MB_GROUP_PREALLOC, group_prealloc);
+
+ return 0;
+
+err_out:
+ printk(KERN_ERR "EXT4-fs: Unable to create %s\n", devname);
+ remove_proc_entry(EXT4_MB_GROUP_PREALLOC, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_STREAM_REQ, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_ORDER2_REQ, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_MIN_TO_SCAN_NAME, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_MAX_TO_SCAN_NAME, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_STATS_NAME, sbi->s_mb_proc);
+ remove_proc_entry(devname, proc_root_ext4);
+ sbi->s_mb_proc = NULL;
+
+ return -ENOMEM;
+}
+
+static int ext4_mb_destroy_per_dev_proc(struct super_block *sb)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ char devname[64];
+
+ if (sbi->s_mb_proc == NULL)
+ return -EINVAL;
+
+ snprintf(devname, sizeof(devname) - 1, "%s",
+ bdevname(sb->s_bdev, devname));
+ remove_proc_entry(EXT4_MB_GROUP_PREALLOC, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_STREAM_REQ, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_ORDER2_REQ, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_MIN_TO_SCAN_NAME, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_MAX_TO_SCAN_NAME, sbi->s_mb_proc);
+ remove_proc_entry(EXT4_MB_STATS_NAME, sbi->s_mb_proc);
+ remove_proc_entry(devname, proc_root_ext4);
+
+ return 0;
+}
+
+int __init init_ext4_mballoc(void)
+{
+ ext4_pspace_cachep =
+ kmem_cache_create("ext4_prealloc_space",
+ sizeof(struct ext4_prealloc_space),
+ 0, SLAB_RECLAIM_ACCOUNT, NULL);
+ if (ext4_pspace_cachep == NULL)
+ return -ENOMEM;
+
+#ifdef CONFIG_PROC_FS
+ proc_root_ext4 = proc_mkdir(EXT4_ROOT, proc_root_fs);
+ if (proc_root_ext4 == NULL)
+ printk(KERN_ERR "EXT4-fs: Unable to create %s\n", EXT4_ROOT);
+#endif
+
+ return 0;
+}
+
+void exit_ext4_mballoc(void)
+{
+ /* XXX: synchronize_rcu(); */
+ kmem_cache_destroy(ext4_pspace_cachep);
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry(EXT4_ROOT, proc_root_fs);
+#endif
+}
+
+
+/*
+ * Check quota and mark choosed space (ac->ac_b_ex) non-free in bitmaps
+ * Returns 0 if success or error code
+ */
+static int ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
+ handle_t *handle)
+{
+ struct buffer_head *bitmap_bh = NULL;
+ struct ext4_super_block *es;
+ struct ext4_group_desc *gdp;
+ struct buffer_head *gdp_bh;
+ struct ext4_sb_info *sbi;
+ struct super_block *sb;
+ ext4_fsblk_t block;
+ int err;
+
+ BUG_ON(ac->ac_status != AC_STATUS_FOUND);
+ BUG_ON(ac->ac_b_ex.fe_len <= 0);
+
+ sb = ac->ac_sb;
+ sbi = EXT4_SB(sb);
+ es = sbi->s_es;
+
+ ext4_debug("using block group %lu(%d)\n", ac->ac_b_ex.fe_group,
+ gdp->bg_free_blocks_count);
+
+ err = -EIO;
+ bitmap_bh = read_block_bitmap(sb, ac->ac_b_ex.fe_group);
+ if (!bitmap_bh)
+ goto out_err;
+
+ err = ext4_journal_get_write_access(handle, bitmap_bh);
+ if (err)
+ goto out_err;
+
+ err = -EIO;
+ gdp = ext4_get_group_desc(sb, ac->ac_b_ex.fe_group, &gdp_bh);
+ if (!gdp)
+ goto out_err;
+
+ err = ext4_journal_get_write_access(handle, gdp_bh);
+ if (err)
+ goto out_err;
+
+ block = ac->ac_b_ex.fe_group * EXT4_BLOCKS_PER_GROUP(sb)
+ + ac->ac_b_ex.fe_start
+ + le32_to_cpu(es->s_first_data_block);
+
+ if (block == ext4_block_bitmap(sb, gdp) ||
+ block == ext4_inode_bitmap(sb, gdp) ||
+ in_range(block, ext4_inode_table(sb, gdp),
+ EXT4_SB(sb)->s_itb_per_group)) {
+
+ ext4_error(sb, __FUNCTION__,
+ "Allocating block in system zone - block = %llu",
+ block);
+ }
+#ifdef AGGRESSIVE_CHECK
+ {
+ int i;
+ for (i = 0; i < ac->ac_b_ex.fe_len; i++) {
+ BUG_ON(mb_test_bit(ac->ac_b_ex.fe_start + i,
+ bitmap_bh->b_data));
+ }
+ }
+#endif
+ mb_set_bits(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group), bitmap_bh->b_data,
+ ac->ac_b_ex.fe_start, ac->ac_b_ex.fe_len);
+
+ spin_lock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
+ if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
+ gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
+ gdp->bg_free_blocks_count =
+ cpu_to_le16(ext4_free_blocks_after_init(sb,
+ ac->ac_b_ex.fe_group,
+ gdp));
+ }
+ gdp->bg_free_blocks_count =
+ cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count)
+ - ac->ac_b_ex.fe_len);
+ gdp->bg_checksum = ext4_group_desc_csum(sbi, ac->ac_b_ex.fe_group, gdp);
+ spin_unlock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
+ percpu_counter_sub(&sbi->s_freeblocks_counter, ac->ac_b_ex.fe_len);
+
+ err = ext4_journal_dirty_metadata(handle, bitmap_bh);
+ if (err)
+ goto out_err;
+ err = ext4_journal_dirty_metadata(handle, gdp_bh);
+
+out_err:
+ sb->s_dirt = 1;
+ put_bh(bitmap_bh);
+ return err;
+}
+
+/*
+ * here we normalize request for locality group
+ * Group request are normalized to s_strip size if we set the same via mount
+ * option. If not we set it to s_mb_group_prealloc which can be configured via
+ * /proc/fs/ext4/<partition>/group_prealloc
+ *
+ * XXX: should we try to preallocate more than the group has now?
+ */
+static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac)
+{
+ struct super_block *sb = ac->ac_sb;
+ struct ext4_locality_group *lg = ac->ac_lg;
+
+ BUG_ON(lg == NULL);
+ if (EXT4_SB(sb)->s_stripe)
+ ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_stripe;
+ else
+ ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc;
+ mb_debug("#%u: goal %lu blocks for locality group\n",
+ current->pid, ac->ac_g_ex.fe_len);
+}
+
+/*
+ * Normalization means making request better in terms of
+ * size and alignment
+ */
+static void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
+ struct ext4_allocation_request *ar)
+{
+ int bsbits, max;
+ ext4_lblk_t end;
+ struct list_head *cur;
+ loff_t size, orig_size, start_off;
+ ext4_lblk_t start, orig_start;
+ struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
+
+ /* do normalize only data requests, metadata requests
+ do not need preallocation */
+ if (!(ac->ac_flags & EXT4_MB_HINT_DATA))
+ return;
+
+ /* sometime caller may want exact blocks */
+ if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY))
+ return;
+
+ /* caller may indicate that preallocation isn't
+ * required (it's a tail, for example) */
+ if (ac->ac_flags & EXT4_MB_HINT_NOPREALLOC)
+ return;
+
+ if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) {
+ ext4_mb_normalize_group_request(ac);
+ return ;
+ }
+
+ bsbits = ac->ac_sb->s_blocksize_bits;
+
+ /* first, let's learn actual file size
+ * given current request is allocated */
+ size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
+ size = size << bsbits;
+ if (size < i_size_read(ac->ac_inode))
+ size = i_size_read(ac->ac_inode);
+
+ /* max available blocks in a free group */
+ max = EXT4_BLOCKS_PER_GROUP(ac->ac_sb) - 1 - 1 -
+ EXT4_SB(ac->ac_sb)->s_itb_per_group;
+
+#define NRL_CHECK_SIZE(req, size, max,bits) \
+ (req <= (size) || max <= ((size) >> bits))
+
+ /* first, try to predict filesize */
+ /* XXX: should this table be tunable? */
+ start_off = 0;
+ if (size <= 16 * 1024) {
+ size = 16 * 1024;
+ } else if (size <= 32 * 1024) {
+ size = 32 * 1024;
+ } else if (size <= 64 * 1024) {
+ size = 64 * 1024;
+ } else if (size <= 128 * 1024) {
+ size = 128 * 1024;
+ } else if (size <= 256 * 1024) {
+ size = 256 * 1024;
+ } else if (size <= 512 * 1024) {
+ size = 512 * 1024;
+ } else if (size <= 1024 * 1024) {
+ size = 1024 * 1024;
+ } else if (NRL_CHECK_SIZE(size, 4 * 1024 * 1024, max, bsbits)) {
+ start_off = ((loff_t)ac->ac_o_ex.fe_logical >>
+ (20 - bsbits)) << 20;
+ size = 1024 * 1024;
+ } else if (NRL_CHECK_SIZE(size, 8 * 1024 * 1024, max, bsbits)) {
+ start_off = ((loff_t)ac->ac_o_ex.fe_logical >>
+ (22 - bsbits)) << 22;
+ size = 4 * 1024 * 1024;
+ } else if (NRL_CHECK_SIZE(ac->ac_o_ex.fe_len,
+ (8<<20)>>bsbits, max, bsbits)) {
+ start_off = ((loff_t)ac->ac_o_ex.fe_logical >>
+ (23 - bsbits)) << 23;
+ size = 8 * 1024 * 1024;
+ } else {
+ start_off = (loff_t)ac->ac_o_ex.fe_logical << bsbits;
+ size = ac->ac_o_ex.fe_len << bsbits;
+ }
+ orig_size = size = size >> bsbits;
+ orig_start = start = start_off >> bsbits;
+
+ /* don't cover already allocated blocks in selected range */
+ if (ar->pleft && start <= ar->lleft) {
+ size -= ar->lleft + 1 - start;
+ start = ar->lleft + 1;
+ }
+ if (ar->pright && start + size - 1 >= ar->lright)
+ size -= start + size - ar->lright;
+
+ end = start + size;
+
+ /* check we don't cross already preallocated blocks */
+ rcu_read_lock();
+ list_for_each_rcu(cur, &ei->i_prealloc_list) {
+ struct ext4_prealloc_space *pa;
+ unsigned long pa_end;
+
+ pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
+
+ if (pa->pa_deleted)
+ continue;
+ spin_lock(&pa->pa_lock);
+ if (pa->pa_deleted) {
+ spin_unlock(&pa->pa_lock);
+ continue;
+ }
+
+ pa_end = pa->pa_lstart + pa->pa_len;
+
+ /* PA must not overlap original request */
+ BUG_ON(!(ac->ac_o_ex.fe_logical >= pa_end ||
+ ac->ac_o_ex.fe_logical < pa->pa_lstart));
+
+ /* skip PA normalized request doesn't overlap with */
+ if (pa->pa_lstart >= end) {
+ spin_unlock(&pa->pa_lock);
+ continue;
+ }
+ if (pa_end <= start) {
+ spin_unlock(&pa->pa_lock);
+ continue;
+ }
+ BUG_ON(pa->pa_lstart <= start && pa_end >= end);
+
+ if (pa_end <= ac->ac_o_ex.fe_logical) {
+ BUG_ON(pa_end < start);
+ start = pa_end;
+ }
+
+ if (pa->pa_lstart > ac->ac_o_ex.fe_logical) {
+ BUG_ON(pa->pa_lstart > end);
+ end = pa->pa_lstart;
+ }
+ spin_unlock(&pa->pa_lock);
+ }
+ rcu_read_unlock();
+ size = end - start;
+
+ /* XXX: extra loop to check we really don't overlap preallocations */
+ rcu_read_lock();
+ list_for_each_rcu(cur, &ei->i_prealloc_list) {
+ struct ext4_prealloc_space *pa;
+ unsigned long pa_end;
+ pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
+ spin_lock(&pa->pa_lock);
+ if (pa->pa_deleted == 0) {
+ pa_end = pa->pa_lstart + pa->pa_len;
+ BUG_ON(!(start >= pa_end || end <= pa->pa_lstart));
+ }
+ spin_unlock(&pa->pa_lock);
+ }
+ rcu_read_unlock();
+
+ if (start + size <= ac->ac_o_ex.fe_logical &&
+ start > ac->ac_o_ex.fe_logical) {
+ printk(KERN_ERR "start %lu, size %lu, fe_logical %lu\n",
+ (unsigned long) start, (unsigned long) size,
+ (unsigned long) ac->ac_o_ex.fe_logical);
+ }
+ BUG_ON(start + size <= ac->ac_o_ex.fe_logical &&
+ start > ac->ac_o_ex.fe_logical);
+ BUG_ON(size <= 0 || size >= EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
+
+ /* now prepare goal request */
+
+ /* XXX: is it better to align blocks WRT to logical
+ * placement or satisfy big request as is */
+ ac->ac_g_ex.fe_logical = start;
+ ac->ac_g_ex.fe_len = size;
+
+ /* define goal start in order to merge */
+ if (ar->pright && (ar->lright == (start + size))) {
+ /* merge to the right */
+ ext4_get_group_no_and_offset(ac->ac_sb, ar->pright - size,
+ &ac->ac_f_ex.fe_group,
+ &ac->ac_f_ex.fe_start);
+ ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL;
+ }
+ if (ar->pleft && (ar->lleft + 1 == start)) {
+ /* merge to the left */
+ ext4_get_group_no_and_offset(ac->ac_sb, ar->pleft + 1,
+ &ac->ac_f_ex.fe_group,
+ &ac->ac_f_ex.fe_start);
+ ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL;
+ }
+
+ mb_debug("goal: %u(was %u) blocks at %u\n", (unsigned) size,
+ (unsigned) orig_size, (unsigned) start);
+}
+
+static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
+
+ if (sbi->s_mb_stats && ac->ac_g_ex.fe_len > 1) {
+ atomic_inc(&sbi->s_bal_reqs);
+ atomic_add(ac->ac_b_ex.fe_len, &sbi->s_bal_allocated);
+ if (ac->ac_o_ex.fe_len >= ac->ac_g_ex.fe_len)
+ atomic_inc(&sbi->s_bal_success);
+ atomic_add(ac->ac_found, &sbi->s_bal_ex_scanned);
+ if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start &&
+ ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group)
+ atomic_inc(&sbi->s_bal_goals);
+ if (ac->ac_found > sbi->s_mb_max_to_scan)
+ atomic_inc(&sbi->s_bal_breaks);
+ }
+
+ ext4_mb_store_history(ac);
+}
+
+/*
+ * use blocks preallocated to inode
+ */
+static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac,
+ struct ext4_prealloc_space *pa)
+{
+ ext4_fsblk_t start;
+ ext4_fsblk_t end;
+ int len;
+
+ /* found preallocated blocks, use them */
+ start = pa->pa_pstart + (ac->ac_o_ex.fe_logical - pa->pa_lstart);
+ end = min(pa->pa_pstart + pa->pa_len, start + ac->ac_o_ex.fe_len);
+ len = end - start;
+ ext4_get_group_no_and_offset(ac->ac_sb, start, &ac->ac_b_ex.fe_group,
+ &ac->ac_b_ex.fe_start);
+ ac->ac_b_ex.fe_len = len;
+ ac->ac_status = AC_STATUS_FOUND;
+ ac->ac_pa = pa;
+
+ BUG_ON(start < pa->pa_pstart);
+ BUG_ON(start + len > pa->pa_pstart + pa->pa_len);
+ BUG_ON(pa->pa_free < len);
+ pa->pa_free -= len;
+
+ mb_debug("use %llu/%lu from inode pa %p\n", start, len, pa);
+}
+
+/*
+ * use blocks preallocated to locality group
+ */
+static void ext4_mb_use_group_pa(struct ext4_allocation_context *ac,
+ struct ext4_prealloc_space *pa)
+{
+ unsigned len = ac->ac_o_ex.fe_len;
+
+ ext4_get_group_no_and_offset(ac->ac_sb, pa->pa_pstart,
+ &ac->ac_b_ex.fe_group,
+ &ac->ac_b_ex.fe_start);
+ ac->ac_b_ex.fe_len = len;
+ ac->ac_status = AC_STATUS_FOUND;
+ ac->ac_pa = pa;
+
+ /* we don't correct pa_pstart or pa_plen here to avoid
+ * possible race when tte group is being loaded concurrently
+ * instead we correct pa later, after blocks are marked
+ * in on-disk bitmap -- see ext4_mb_release_context() */
+ /*
+ * FIXME!! but the other CPUs can look at this particular
+ * pa and think that it have enought free blocks if we
+ * don't update pa_free here right ?
+ */
+ mb_debug("use %u/%u from group pa %p\n", pa->pa_lstart-len, len, pa);
+}
+
+/*
+ * search goal blocks in preallocated space
+ */
+static int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
+{
+ struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
+ struct ext4_locality_group *lg;
+ struct ext4_prealloc_space *pa;
+ struct list_head *cur;
+
+ /* only data can be preallocated */
+ if (!(ac->ac_flags & EXT4_MB_HINT_DATA))
+ return 0;
+
+ /* first, try per-file preallocation */
+ rcu_read_lock();
+ list_for_each_rcu(cur, &ei->i_prealloc_list) {
+ pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
+
+ /* all fields in this condition don't change,
+ * so we can skip locking for them */
+ if (ac->ac_o_ex.fe_logical < pa->pa_lstart ||
+ ac->ac_o_ex.fe_logical >= pa->pa_lstart + pa->pa_len)
+ continue;
+
+ /* found preallocated blocks, use them */
+ spin_lock(&pa->pa_lock);
+ if (pa->pa_deleted == 0 && pa->pa_free) {
+ atomic_inc(&pa->pa_count);
+ ext4_mb_use_inode_pa(ac, pa);
+ spin_unlock(&pa->pa_lock);
+ ac->ac_criteria = 10;
+ rcu_read_unlock();
+ return 1;
+ }
+ spin_unlock(&pa->pa_lock);
+ }
+ rcu_read_unlock();
+
+ /* can we use group allocation? */
+ if (!(ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC))
+ return 0;
+
+ /* inode may have no locality group for some reason */
+ lg = ac->ac_lg;
+ if (lg == NULL)
+ return 0;
+
+ rcu_read_lock();
+ list_for_each_rcu(cur, &lg->lg_prealloc_list) {
+ pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
+ spin_lock(&pa->pa_lock);
+ if (pa->pa_deleted == 0 && pa->pa_free >= ac->ac_o_ex.fe_len) {
+ atomic_inc(&pa->pa_count);
+ ext4_mb_use_group_pa(ac, pa);
+ spin_unlock(&pa->pa_lock);
+ ac->ac_criteria = 20;
+ rcu_read_unlock();
+ return 1;
+ }
+ spin_unlock(&pa->pa_lock);
+ }
+ rcu_read_unlock();
+
+ return 0;
+}
+
+/*
+ * the function goes through all preallocation in this group and marks them
+ * used in in-core bitmap. buddy must be generated from this bitmap
+ * Need to be called with ext4 group lock (ext4_lock_group)
+ */
+static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
+ ext4_group_t group)
+{
+ struct ext4_group_info *grp = ext4_get_group_info(sb, group);
+ struct ext4_prealloc_space *pa;
+ struct list_head *cur;
+ ext4_group_t groupnr;
+ ext4_grpblk_t start;
+ int preallocated = 0;
+ int count = 0;
+ int len;
+
+ /* all form of preallocation discards first load group,
+ * so the only competing code is preallocation use.
+ * we don't need any locking here
+ * notice we do NOT ignore preallocations with pa_deleted
+ * otherwise we could leave used blocks available for
+ * allocation in buddy when concurrent ext4_mb_put_pa()
+ * is dropping preallocation
+ */
+ list_for_each(cur, &grp->bb_prealloc_list) {
+ pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list);
+ spin_lock(&pa->pa_lock);
+ ext4_get_group_no_and_offset(sb, pa->pa_pstart,
+ &groupnr, &start);
+ len = pa->pa_len;
+ spin_unlock(&pa->pa_lock);
+ if (unlikely(len == 0))
+ continue;
+ BUG_ON(groupnr != group);
+ mb_set_bits(sb_bgl_lock(EXT4_SB(sb), group),
+ bitmap, start, len);
+ preallocated += len;
+ count++;
+ }
+ mb_debug("prellocated %u for group %lu\n", preallocated, group);
+}
+
+static void ext4_mb_pa_callback(struct rcu_head *head)
+{
+ struct ext4_prealloc_space *pa;
+ pa = container_of(head, struct ext4_prealloc_space, u.pa_rcu);
+ kmem_cache_free(ext4_pspace_cachep, pa);
+}
+
+/*
+ * drops a reference to preallocated space descriptor
+ * if this was the last reference and the space is consumed
+ */
+static void ext4_mb_put_pa(struct ext4_allocation_context *ac,
+ struct super_block *sb, struct ext4_prealloc_space *pa)
+{
+ unsigned long grp;
+
+ if (!atomic_dec_and_test(&pa->pa_count) || pa->pa_free != 0)
+ return;
+
+ /* in this short window concurrent discard can set pa_deleted */
+ spin_lock(&pa->pa_lock);
+ if (pa->pa_deleted == 1) {
+ spin_unlock(&pa->pa_lock);
+ return;
+ }
+
+ pa->pa_deleted = 1;
+ spin_unlock(&pa->pa_lock);
+
+ /* -1 is to protect from crossing allocation group */
+ ext4_get_group_no_and_offset(sb, pa->pa_pstart - 1, &grp, NULL);
+
+ /*
+ * possible race:
+ *
+ * P1 (buddy init) P2 (regular allocation)
+ * find block B in PA
+ * copy on-disk bitmap to buddy
+ * mark B in on-disk bitmap
+ * drop PA from group
+ * mark all PAs in buddy
+ *
+ * thus, P1 initializes buddy with B available. to prevent this
+ * we make "copy" and "mark all PAs" atomic and serialize "drop PA"
+ * against that pair
+ */
+ ext4_lock_group(sb, grp);
+ list_del(&pa->pa_group_list);
+ ext4_unlock_group(sb, grp);
+
+ spin_lock(pa->pa_obj_lock);
+ list_del_rcu(&pa->pa_inode_list);
+ spin_unlock(pa->pa_obj_lock);
+
+ call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback);
+}
+
+/*
+ * creates new preallocated space for given inode
+ */
+static int ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
+{
+ struct super_block *sb = ac->ac_sb;
+ struct ext4_prealloc_space *pa;
+ struct ext4_group_info *grp;
+ struct ext4_inode_info *ei;
+
+ /* preallocate only when found space is larger then requested */
+ BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len);
+ BUG_ON(ac->ac_status != AC_STATUS_FOUND);
+ BUG_ON(!S_ISREG(ac->ac_inode->i_mode));
+
+ pa = kmem_cache_alloc(ext4_pspace_cachep, GFP_NOFS);
+ if (pa == NULL)
+ return -ENOMEM;
+
+ if (ac->ac_b_ex.fe_len < ac->ac_g_ex.fe_len) {
+ int winl;
+ int wins;
+ int win;
+ int offs;
+
+ /* we can't allocate as much as normalizer wants.
+ * so, found space must get proper lstart
+ * to cover original request */
+ BUG_ON(ac->ac_g_ex.fe_logical > ac->ac_o_ex.fe_logical);
+ BUG_ON(ac->ac_g_ex.fe_len < ac->ac_o_ex.fe_len);
+
+ /* we're limited by original request in that
+ * logical block must be covered any way
+ * winl is window we can move our chunk within */
+ winl = ac->ac_o_ex.fe_logical - ac->ac_g_ex.fe_logical;
+
+ /* also, we should cover whole original request */
+ wins = ac->ac_b_ex.fe_len - ac->ac_o_ex.fe_len;
+
+ /* the smallest one defines real window */
+ win = min(winl, wins);
+
+ offs = ac->ac_o_ex.fe_logical % ac->ac_b_ex.fe_len;
+ if (offs && offs < win)
+ win = offs;
+
+ ac->ac_b_ex.fe_logical = ac->ac_o_ex.fe_logical - win;
+ BUG_ON(ac->ac_o_ex.fe_logical < ac->ac_b_ex.fe_logical);
+ BUG_ON(ac->ac_o_ex.fe_len > ac->ac_b_ex.fe_len);
+ }
+
+ /* preallocation can change ac_b_ex, thus we store actually
+ * allocated blocks for history */
+ ac->ac_f_ex = ac->ac_b_ex;
+
+ pa->pa_lstart = ac->ac_b_ex.fe_logical;
+ pa->pa_pstart = ext4_grp_offs_to_block(sb, &ac->ac_b_ex);
+ pa->pa_len = ac->ac_b_ex.fe_len;
+ pa->pa_free = pa->pa_len;
+ atomic_set(&pa->pa_count, 1);
+ spin_lock_init(&pa->pa_lock);
+ pa->pa_deleted = 0;
+ pa->pa_linear = 0;
+
+ mb_debug("new inode pa %p: %llu/%u for %u\n", pa,
+ pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+
+ ext4_mb_use_inode_pa(ac, pa);
+ atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated);
+
+ ei = EXT4_I(ac->ac_inode);
+ grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group);
+
+ pa->pa_obj_lock = &ei->i_prealloc_lock;
+ pa->pa_inode = ac->ac_inode;
+
+ ext4_lock_group(sb, ac->ac_b_ex.fe_group);
+ list_add(&pa->pa_group_list, &grp->bb_prealloc_list);
+ ext4_unlock_group(sb, ac->ac_b_ex.fe_group);
+
+ spin_lock(pa->pa_obj_lock);
+ list_add_rcu(&pa->pa_inode_list, &ei->i_prealloc_list);
+ spin_unlock(pa->pa_obj_lock);
+
+ return 0;
+}
+
+/*
+ * creates new preallocated space for locality group inodes belongs to
+ */
+static int ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
+{
+ struct super_block *sb = ac->ac_sb;
+ struct ext4_locality_group *lg;
+ struct ext4_prealloc_space *pa;
+ struct ext4_group_info *grp;
+
+ /* preallocate only when found space is larger then requested */
+ BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len);
+ BUG_ON(ac->ac_status != AC_STATUS_FOUND);
+ BUG_ON(!S_ISREG(ac->ac_inode->i_mode));
+
+ BUG_ON(ext4_pspace_cachep == NULL);
+ pa = kmem_cache_alloc(ext4_pspace_cachep, GFP_NOFS);
+ if (pa == NULL)
+ return -ENOMEM;
+
+ /* preallocation can change ac_b_ex, thus we store actually
+ * allocated blocks for history */
+ ac->ac_f_ex = ac->ac_b_ex;
+
+ pa->pa_pstart = ext4_grp_offs_to_block(sb, &ac->ac_b_ex);
+ pa->pa_lstart = pa->pa_pstart;
+ pa->pa_len = ac->ac_b_ex.fe_len;
+ pa->pa_free = pa->pa_len;
+ atomic_set(&pa->pa_count, 1);
+ spin_lock_init(&pa->pa_lock);
+ pa->pa_deleted = 0;
+ pa->pa_linear = 1;
+
+ mb_debug("new group pa %p: %llu/%u for %u\n", pa,
+ pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+
+ ext4_mb_use_group_pa(ac, pa);
+ atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated);
+
+ grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group);
+ lg = ac->ac_lg;
+ BUG_ON(lg == NULL);
+
+ pa->pa_obj_lock = &lg->lg_prealloc_lock;
+ pa->pa_inode = NULL;
+
+ ext4_lock_group(sb, ac->ac_b_ex.fe_group);
+ list_add(&pa->pa_group_list, &grp->bb_prealloc_list);
+ ext4_unlock_group(sb, ac->ac_b_ex.fe_group);
+
+ spin_lock(pa->pa_obj_lock);
+ list_add_tail_rcu(&pa->pa_inode_list, &lg->lg_prealloc_list);
+ spin_unlock(pa->pa_obj_lock);
+
+ return 0;
+}
+
+static int ext4_mb_new_preallocation(struct ext4_allocation_context *ac)
+{
+ int err;
+
+ if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC)
+ err = ext4_mb_new_group_pa(ac);
+ else
+ err = ext4_mb_new_inode_pa(ac);
+ return err;
+}
+
+/*
+ * finds all unused blocks in on-disk bitmap, frees them in
+ * in-core bitmap and buddy.
+ * @pa must be unlinked from inode and group lists, so that
+ * nobody else can find/use it.
+ * the caller MUST hold group/inode locks.
+ * TODO: optimize the case when there are no in-core structures yet
+ */
+static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
+ struct buffer_head *bitmap_bh,
+ struct ext4_prealloc_space *pa)
+{
+ struct ext4_allocation_context ac;
+ struct super_block *sb = e4b->bd_sb;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ unsigned long end;
+ unsigned long next;
+ ext4_group_t group;
+ ext4_grpblk_t bit;
+ sector_t start;
+ int err = 0;
+ int free = 0;
+
+ BUG_ON(pa->pa_deleted == 0);
+ ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
+ BUG_ON(group != e4b->bd_group && pa->pa_len != 0);
+ end = bit + pa->pa_len;
+
+ ac.ac_sb = sb;
+ ac.ac_inode = pa->pa_inode;
+ ac.ac_op = EXT4_MB_HISTORY_DISCARD;
+
+ while (bit < end) {
+ bit = ext4_find_next_zero_bit(bitmap_bh->b_data, end, bit);
+ if (bit >= end)
+ break;
+ next = ext4_find_next_bit(bitmap_bh->b_data, end, bit);
+ if (next > end)
+ next = end;
+ start = group * EXT4_BLOCKS_PER_GROUP(sb) + bit +
+ le32_to_cpu(sbi->s_es->s_first_data_block);
+ mb_debug(" free preallocated %u/%u in group %u\n",
+ (unsigned) start, (unsigned) next - bit,
+ (unsigned) group);
+ free += next - bit;
+
+ ac.ac_b_ex.fe_group = group;
+ ac.ac_b_ex.fe_start = bit;
+ ac.ac_b_ex.fe_len = next - bit;
+ ac.ac_b_ex.fe_logical = 0;
+ ext4_mb_store_history(&ac);
+
+ mb_free_blocks(pa->pa_inode, e4b, bit, next - bit);
+ bit = next + 1;
+ }
+ if (free != pa->pa_free) {
+ printk(KERN_ERR "pa %p: logic %lu, phys. %lu, len %lu\n",
+ pa, (unsigned long) pa->pa_lstart,
+ (unsigned long) pa->pa_pstart,
+ (unsigned long) pa->pa_len);
+ printk(KERN_ERR "free %u, pa_free %u\n", free, pa->pa_free);
+ }
+ BUG_ON(free != pa->pa_free);
+ atomic_add(free, &sbi->s_mb_discarded);
+
+ return err;
+}
+
+static int ext4_mb_release_group_pa(struct ext4_buddy *e4b,
+ struct ext4_prealloc_space *pa)
+{
+ struct ext4_allocation_context ac;
+ struct super_block *sb = e4b->bd_sb;
+ ext4_group_t group;
+ ext4_grpblk_t bit;
+
+ ac.ac_op = EXT4_MB_HISTORY_DISCARD;
+
+ BUG_ON(pa->pa_deleted == 0);
+ ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
+ BUG_ON(group != e4b->bd_group && pa->pa_len != 0);
+ mb_free_blocks(pa->pa_inode, e4b, bit, pa->pa_len);
+ atomic_add(pa->pa_len, &EXT4_SB(sb)->s_mb_discarded);
+
+ ac.ac_sb = sb;
+ ac.ac_inode = NULL;
+ ac.ac_b_ex.fe_group = group;
+ ac.ac_b_ex.fe_start = bit;
+ ac.ac_b_ex.fe_len = pa->pa_len;
+ ac.ac_b_ex.fe_logical = 0;
+ ext4_mb_store_history(&ac);
+
+ return 0;
+}
+
+/*
+ * releases all preallocations in given group
+ *
+ * first, we need to decide discard policy:
+ * - when do we discard
+ * 1) ENOSPC
+ * - how many do we discard
+ * 1) how many requested
+ */
+static int ext4_mb_discard_group_preallocations(struct super_block *sb,
+ ext4_group_t group, int needed)
+{
+ struct ext4_group_info *grp = ext4_get_group_info(sb, group);
+ struct buffer_head *bitmap_bh = NULL;
+ struct ext4_prealloc_space *pa, *tmp;
+ struct list_head list;
+ struct ext4_buddy e4b;
+ int err;
+ int busy = 0;
+ int free = 0;
+
+ mb_debug("discard preallocation for group %lu\n", group);
+
+ if (list_empty(&grp->bb_prealloc_list))
+ return 0;
+
+ bitmap_bh = read_block_bitmap(sb, group);
+ if (bitmap_bh == NULL) {
+ /* error handling here */
+ ext4_mb_release_desc(&e4b);
+ BUG_ON(bitmap_bh == NULL);
+ }
+
+ err = ext4_mb_load_buddy(sb, group, &e4b);
+ BUG_ON(err != 0); /* error handling here */
+
+ if (needed == 0)
+ needed = EXT4_BLOCKS_PER_GROUP(sb) + 1;
+
+ grp = ext4_get_group_info(sb, group);
+ INIT_LIST_HEAD(&list);
+
+repeat:
+ ext4_lock_group(sb, group);
+ list_for_each_entry_safe(pa, tmp,
+ &grp->bb_prealloc_list, pa_group_list) {
+ spin_lock(&pa->pa_lock);
+ if (atomic_read(&pa->pa_count)) {
+ spin_unlock(&pa->pa_lock);
+ busy = 1;
+ continue;
+ }
+ if (pa->pa_deleted) {
+ spin_unlock(&pa->pa_lock);
+ continue;
+ }
+
+ /* seems this one can be freed ... */
+ pa->pa_deleted = 1;
+
+ /* we can trust pa_free ... */
+ free += pa->pa_free;
+
+ spin_unlock(&pa->pa_lock);
+
+ list_del(&pa->pa_group_list);
+ list_add(&pa->u.pa_tmp_list, &list);
+ }
+
+ /* if we still need more blocks and some PAs were used, try again */
+ if (free < needed && busy) {
+ busy = 0;
+ ext4_unlock_group(sb, group);
+ /*
+ * Yield the CPU here so that we don't get soft lockup
+ * in non preempt case.
+ */
+ yield();
+ goto repeat;
+ }
+
+ /* found anything to free? */
+ if (list_empty(&list)) {
+ BUG_ON(free != 0);
+ goto out;
+ }
+
+ /* now free all selected PAs */
+ list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) {
+
+ /* remove from object (inode or locality group) */
+ spin_lock(pa->pa_obj_lock);
+ list_del_rcu(&pa->pa_inode_list);
+ spin_unlock(pa->pa_obj_lock);
+
+ if (pa->pa_linear)
+ ext4_mb_release_group_pa(&e4b, pa);
+ else
+ ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa);
+
+ list_del(&pa->u.pa_tmp_list);
+ call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback);
+ }
+
+out:
+ ext4_unlock_group(sb, group);
+ ext4_mb_release_desc(&e4b);
+ put_bh(bitmap_bh);
+ return free;
+}
+
+/*
+ * releases all non-used preallocated blocks for given inode
+ *
+ * It's important to discard preallocations under i_data_sem
+ * We don't want another block to be served from the prealloc
+ * space when we are discarding the inode prealloc space.
+ *
+ * FIXME!! Make sure it is valid at all the call sites
+ */
+void ext4_mb_discard_inode_preallocations(struct inode *inode)
+{
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ struct super_block *sb = inode->i_sb;
+ struct buffer_head *bitmap_bh = NULL;
+ struct ext4_prealloc_space *pa, *tmp;
+ ext4_group_t group = 0;
+ struct list_head list;
+ struct ext4_buddy e4b;
+ int err;
+
+ if (!test_opt(sb, MBALLOC) || !S_ISREG(inode->i_mode)) {
+ /*BUG_ON(!list_empty(&ei->i_prealloc_list));*/
+ return;
+ }
+
+ mb_debug("discard preallocation for inode %lu\n", inode->i_ino);
+
+ INIT_LIST_HEAD(&list);
+
+repeat:
+ /* first, collect all pa's in the inode */
+ spin_lock(&ei->i_prealloc_lock);
+ while (!list_empty(&ei->i_prealloc_list)) {
+ pa = list_entry(ei->i_prealloc_list.next,
+ struct ext4_prealloc_space, pa_inode_list);
+ BUG_ON(pa->pa_obj_lock != &ei->i_prealloc_lock);
+ spin_lock(&pa->pa_lock);
+ if (atomic_read(&pa->pa_count)) {
+ /* this shouldn't happen often - nobody should
+ * use preallocation while we're discarding it */
+ spin_unlock(&pa->pa_lock);
+ spin_unlock(&ei->i_prealloc_lock);
+ printk(KERN_ERR "uh-oh! used pa while discarding\n");
+ WARN_ON(1);
+ schedule_timeout_uninterruptible(HZ);
+ goto repeat;
+
+ }
+ if (pa->pa_deleted == 0) {
+ pa->pa_deleted = 1;
+ spin_unlock(&pa->pa_lock);
+ list_del_rcu(&pa->pa_inode_list);
+ list_add(&pa->u.pa_tmp_list, &list);
+ continue;
+ }
+
+ /* someone is deleting pa right now */
+ spin_unlock(&pa->pa_lock);
+ spin_unlock(&ei->i_prealloc_lock);
+
+ /* we have to wait here because pa_deleted
+ * doesn't mean pa is already unlinked from
+ * the list. as we might be called from
+ * ->clear_inode() the inode will get freed
+ * and concurrent thread which is unlinking
+ * pa from inode's list may access already
+ * freed memory, bad-bad-bad */
+
+ /* XXX: if this happens too often, we can
+ * add a flag to force wait only in case
+ * of ->clear_inode(), but not in case of
+ * regular truncate */
+ schedule_timeout_uninterruptible(HZ);
+ goto repeat;
+ }
+ spin_unlock(&ei->i_prealloc_lock);
+
+ list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) {
+ BUG_ON(pa->pa_linear != 0);
+ ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, NULL);
+
+ err = ext4_mb_load_buddy(sb, group, &e4b);
+ BUG_ON(err != 0); /* error handling here */
+
+ bitmap_bh = read_block_bitmap(sb, group);
+ if (bitmap_bh == NULL) {
+ /* error handling here */
+ ext4_mb_release_desc(&e4b);
+ BUG_ON(bitmap_bh == NULL);
+ }
+
+ ext4_lock_group(sb, group);
+ list_del(&pa->pa_group_list);
+ ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa);
+ ext4_unlock_group(sb, group);
+
+ ext4_mb_release_desc(&e4b);
+ put_bh(bitmap_bh);
+
+ list_del(&pa->u.pa_tmp_list);
+ call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback);
+ }
+}
+
+/*
+ * finds all preallocated spaces and return blocks being freed to them
+ * if preallocated space becomes full (no block is used from the space)
+ * then the function frees space in buddy
+ * XXX: at the moment, truncate (which is the only way to free blocks)
+ * discards all preallocations
+ */
+static void ext4_mb_return_to_preallocation(struct inode *inode,
+ struct ext4_buddy *e4b,
+ sector_t block, int count)
+{
+ BUG_ON(!list_empty(&EXT4_I(inode)->i_prealloc_list));
+}
+#ifdef MB_DEBUG
+static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
+{
+ struct super_block *sb = ac->ac_sb;
+ ext4_group_t i;
+
+ printk(KERN_ERR "EXT4-fs: Can't allocate:"
+ " Allocation context details:\n");
+ printk(KERN_ERR "EXT4-fs: status %d flags %d\n",
+ ac->ac_status, ac->ac_flags);
+ printk(KERN_ERR "EXT4-fs: orig %lu/%lu/%lu@%lu, goal %lu/%lu/%lu@%lu, "
+ "best %lu/%lu/%lu@%lu cr %d\n",
+ (unsigned long)ac->ac_o_ex.fe_group,
+ (unsigned long)ac->ac_o_ex.fe_start,
+ (unsigned long)ac->ac_o_ex.fe_len,
+ (unsigned long)ac->ac_o_ex.fe_logical,
+ (unsigned long)ac->ac_g_ex.fe_group,
+ (unsigned long)ac->ac_g_ex.fe_start,
+ (unsigned long)ac->ac_g_ex.fe_len,
+ (unsigned long)ac->ac_g_ex.fe_logical,
+ (unsigned long)ac->ac_b_ex.fe_group,
+ (unsigned long)ac->ac_b_ex.fe_start,
+ (unsigned long)ac->ac_b_ex.fe_len,
+ (unsigned long)ac->ac_b_ex.fe_logical,
+ (int)ac->ac_criteria);
+ printk(KERN_ERR "EXT4-fs: %lu scanned, %d found\n", ac->ac_ex_scanned,
+ ac->ac_found);
+ printk(KERN_ERR "EXT4-fs: groups: \n");
+ for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
+ struct ext4_group_info *grp = ext4_get_group_info(sb, i);
+ struct ext4_prealloc_space *pa;
+ ext4_grpblk_t start;
+ struct list_head *cur;
+ ext4_lock_group(sb, i);
+ list_for_each(cur, &grp->bb_prealloc_list) {
+ pa = list_entry(cur, struct ext4_prealloc_space,
+ pa_group_list);
+ spin_lock(&pa->pa_lock);
+ ext4_get_group_no_and_offset(sb, pa->pa_pstart,
+ NULL, &start);
+ spin_unlock(&pa->pa_lock);
+ printk(KERN_ERR "PA:%lu:%d:%u \n", i,
+ start, pa->pa_len);
+ }
+ ext4_lock_group(sb, i);
+
+ if (grp->bb_free == 0)
+ continue;
+ printk(KERN_ERR "%lu: %d/%d \n",
+ i, grp->bb_free, grp->bb_fragments);
+ }
+ printk(KERN_ERR "\n");
+}
+#else
+static inline void ext4_mb_show_ac(struct ext4_allocation_context *ac)
+{
+ return;
+}
+#endif
+
+/*
+ * We use locality group preallocation for small size file. The size of the
+ * file is determined by the current size or the resulting size after
+ * allocation which ever is larger
+ *
+ * One can tune this size via /proc/fs/ext4/<partition>/stream_req
+ */
+static void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
+ int bsbits = ac->ac_sb->s_blocksize_bits;
+ loff_t size, isize;
+
+ if (!(ac->ac_flags & EXT4_MB_HINT_DATA))
+ return;
+
+ size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
+ isize = i_size_read(ac->ac_inode) >> bsbits;
+ size = max(size, isize);
+
+ /* don't use group allocation for large files */
+ if (size >= sbi->s_mb_stream_request)
+ return;
+
+ if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY))
+ return;
+
+ BUG_ON(ac->ac_lg != NULL);
+ /*
+ * locality group prealloc space are per cpu. The reason for having
+ * per cpu locality group is to reduce the contention between block
+ * request from multiple CPUs.
+ */
+ ac->ac_lg = &sbi->s_locality_groups[get_cpu()];
+ put_cpu();
+
+ /* we're going to use group allocation */
+ ac->ac_flags |= EXT4_MB_HINT_GROUP_ALLOC;
+
+ /* serialize all allocations in the group */
+ mutex_lock(&ac->ac_lg->lg_mutex);
+}
+
+static int ext4_mb_initialize_context(struct ext4_allocation_context *ac,
+ struct ext4_allocation_request *ar)
+{
+ struct super_block *sb = ar->inode->i_sb;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ ext4_group_t group;
+ unsigned long len;
+ unsigned long goal;
+ ext4_grpblk_t block;
+
+ /* we can't allocate > group size */
+ len = ar->len;
+
+ /* just a dirty hack to filter too big requests */
+ if (len >= EXT4_BLOCKS_PER_GROUP(sb) - 10)
+ len = EXT4_BLOCKS_PER_GROUP(sb) - 10;
+
+ /* start searching from the goal */
+ goal = ar->goal;
+ if (goal < le32_to_cpu(es->s_first_data_block) ||
+ goal >= ext4_blocks_count(es))
+ goal = le32_to_cpu(es->s_first_data_block);
+ ext4_get_group_no_and_offset(sb, goal, &group, &block);
+
+ /* set up allocation goals */
+ ac->ac_b_ex.fe_logical = ar->logical;
+ ac->ac_b_ex.fe_group = 0;
+ ac->ac_b_ex.fe_start = 0;
+ ac->ac_b_ex.fe_len = 0;
+ ac->ac_status = AC_STATUS_CONTINUE;
+ ac->ac_groups_scanned = 0;
+ ac->ac_ex_scanned = 0;
+ ac->ac_found = 0;
+ ac->ac_sb = sb;
+ ac->ac_inode = ar->inode;
+ ac->ac_o_ex.fe_logical = ar->logical;
+ ac->ac_o_ex.fe_group = group;
+ ac->ac_o_ex.fe_start = block;
+ ac->ac_o_ex.fe_len = len;
+ ac->ac_g_ex.fe_logical = ar->logical;
+ ac->ac_g_ex.fe_group = group;
+ ac->ac_g_ex.fe_start = block;
+ ac->ac_g_ex.fe_len = len;
+ ac->ac_f_ex.fe_len = 0;
+ ac->ac_flags = ar->flags;
+ ac->ac_2order = 0;
+ ac->ac_criteria = 0;
+ ac->ac_pa = NULL;
+ ac->ac_bitmap_page = NULL;
+ ac->ac_buddy_page = NULL;
+ ac->ac_lg = NULL;
+
+ /* we have to define context: we'll we work with a file or
+ * locality group. this is a policy, actually */
+ ext4_mb_group_or_file(ac);
+
+ mb_debug("init ac: %u blocks @ %u, goal %u, flags %x, 2^%d, "
+ "left: %u/%u, right %u/%u to %swritable\n",
+ (unsigned) ar->len, (unsigned) ar->logical,
+ (unsigned) ar->goal, ac->ac_flags, ac->ac_2order,
+ (unsigned) ar->lleft, (unsigned) ar->pleft,
+ (unsigned) ar->lright, (unsigned) ar->pright,
+ atomic_read(&ar->inode->i_writecount) ? "" : "non-");
+ return 0;
+
+}
+
+/*
+ * release all resource we used in allocation
+ */
+static int ext4_mb_release_context(struct ext4_allocation_context *ac)
+{
+ if (ac->ac_pa) {
+ if (ac->ac_pa->pa_linear) {
+ /* see comment in ext4_mb_use_group_pa() */
+ spin_lock(&ac->ac_pa->pa_lock);
+ ac->ac_pa->pa_pstart += ac->ac_b_ex.fe_len;
+ ac->ac_pa->pa_lstart += ac->ac_b_ex.fe_len;
+ ac->ac_pa->pa_free -= ac->ac_b_ex.fe_len;
+ ac->ac_pa->pa_len -= ac->ac_b_ex.fe_len;
+ spin_unlock(&ac->ac_pa->pa_lock);
+ }
+ ext4_mb_put_pa(ac, ac->ac_sb, ac->ac_pa);
+ }
+ if (ac->ac_bitmap_page)
+ page_cache_release(ac->ac_bitmap_page);
+ if (ac->ac_buddy_page)
+ page_cache_release(ac->ac_buddy_page);
+ if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC)
+ mutex_unlock(&ac->ac_lg->lg_mutex);
+ ext4_mb_collect_stats(ac);
+ return 0;
+}
+
+static int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
+{
+ ext4_group_t i;
+ int ret;
+ int freed = 0;
+
+ for (i = 0; i < EXT4_SB(sb)->s_groups_count && needed > 0; i++) {
+ ret = ext4_mb_discard_group_preallocations(sb, i, needed);
+ freed += ret;
+ needed -= ret;
+ }
+
+ return freed;
+}
+
+/*
+ * Main entry point into mballoc to allocate blocks
+ * it tries to use preallocation first, then falls back
+ * to usual allocation
+ */
+ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
+ struct ext4_allocation_request *ar, int *errp)
+{
+ struct ext4_allocation_context ac;
+ struct ext4_sb_info *sbi;
+ struct super_block *sb;
+ ext4_fsblk_t block = 0;
+ int freed;
+ int inquota;
+
+ sb = ar->inode->i_sb;
+ sbi = EXT4_SB(sb);
+
+ if (!test_opt(sb, MBALLOC)) {
+ block = ext4_new_blocks_old(handle, ar->inode, ar->goal,
+ &(ar->len), errp);
+ return block;
+ }
+
+ while (ar->len && DQUOT_ALLOC_BLOCK(ar->inode, ar->len)) {
+ ar->flags |= EXT4_MB_HINT_NOPREALLOC;
+ ar->len--;
+ }
+ if (ar->len == 0) {
+ *errp = -EDQUOT;
+ return 0;
+ }
+ inquota = ar->len;
+
+ ext4_mb_poll_new_transaction(sb, handle);
+
+ *errp = ext4_mb_initialize_context(&ac, ar);
+ if (*errp) {
+ ar->len = 0;
+ goto out;
+ }
+
+ ac.ac_op = EXT4_MB_HISTORY_PREALLOC;
+ if (!ext4_mb_use_preallocated(&ac)) {
+
+ ac.ac_op = EXT4_MB_HISTORY_ALLOC;
+ ext4_mb_normalize_request(&ac, ar);
+
+repeat:
+ /* allocate space in core */
+ ext4_mb_regular_allocator(&ac);
+
+ /* as we've just preallocated more space than
+ * user requested orinally, we store allocated
+ * space in a special descriptor */
+ if (ac.ac_status == AC_STATUS_FOUND &&
+ ac.ac_o_ex.fe_len < ac.ac_b_ex.fe_len)
+ ext4_mb_new_preallocation(&ac);
+ }
+
+ if (likely(ac.ac_status == AC_STATUS_FOUND)) {
+ ext4_mb_mark_diskspace_used(&ac, handle);
+ *errp = 0;
+ block = ext4_grp_offs_to_block(sb, &ac.ac_b_ex);
+ ar->len = ac.ac_b_ex.fe_len;
+ } else {
+ freed = ext4_mb_discard_preallocations(sb, ac.ac_o_ex.fe_len);
+ if (freed)
+ goto repeat;
+ *errp = -ENOSPC;
+ ac.ac_b_ex.fe_len = 0;
+ ar->len = 0;
+ ext4_mb_show_ac(&ac);
+ }
+
+ ext4_mb_release_context(&ac);
+
+out:
+ if (ar->len < inquota)
+ DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
+
+ return block;
+}
+static void ext4_mb_poll_new_transaction(struct super_block *sb,
+ handle_t *handle)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+
+ if (sbi->s_last_transaction == handle->h_transaction->t_tid)
+ return;
+
+ /* new transaction! time to close last one and free blocks for
+ * committed transaction. we know that only transaction can be
+ * active, so previos transaction can be being logged and we
+ * know that transaction before previous is known to be already
+ * logged. this means that now we may free blocks freed in all
+ * transactions before previous one. hope I'm clear enough ... */
+
+ spin_lock(&sbi->s_md_lock);
+ if (sbi->s_last_transaction != handle->h_transaction->t_tid) {
+ mb_debug("new transaction %lu, old %lu\n",
+ (unsigned long) handle->h_transaction->t_tid,
+ (unsigned long) sbi->s_last_transaction);
+ list_splice_init(&sbi->s_closed_transaction,
+ &sbi->s_committed_transaction);
+ list_splice_init(&sbi->s_active_transaction,
+ &sbi->s_closed_transaction);
+ sbi->s_last_transaction = handle->h_transaction->t_tid;
+ }
+ spin_unlock(&sbi->s_md_lock);
+
+ ext4_mb_free_committed_blocks(sb);
+}
+
+static int ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
+ ext4_group_t group, ext4_grpblk_t block, int count)
+{
+ struct ext4_group_info *db = e4b->bd_info;
+ struct super_block *sb = e4b->bd_sb;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_free_metadata *md;
+ int i;
+
+ BUG_ON(e4b->bd_bitmap_page == NULL);
+ BUG_ON(e4b->bd_buddy_page == NULL);
+
+ ext4_lock_group(sb, group);
+ for (i = 0; i < count; i++) {
+ md = db->bb_md_cur;
+ if (md && db->bb_tid != handle->h_transaction->t_tid) {
+ db->bb_md_cur = NULL;
+ md = NULL;
+ }
+
+ if (md == NULL) {
+ ext4_unlock_group(sb, group);
+ md = kmalloc(sizeof(*md), GFP_NOFS);
+ if (md == NULL)
+ return -ENOMEM;
+ md->num = 0;
+ md->group = group;
+
+ ext4_lock_group(sb, group);
+ if (db->bb_md_cur == NULL) {
+ spin_lock(&sbi->s_md_lock);
+ list_add(&md->list, &sbi->s_active_transaction);
+ spin_unlock(&sbi->s_md_lock);
+ /* protect buddy cache from being freed,
+ * otherwise we'll refresh it from
+ * on-disk bitmap and lose not-yet-available
+ * blocks */
+ page_cache_get(e4b->bd_buddy_page);
+ page_cache_get(e4b->bd_bitmap_page);
+ db->bb_md_cur = md;
+ db->bb_tid = handle->h_transaction->t_tid;
+ mb_debug("new md 0x%p for group %lu\n",
+ md, md->group);
+ } else {
+ kfree(md);
+ md = db->bb_md_cur;
+ }
+ }
+
+ BUG_ON(md->num >= EXT4_BB_MAX_BLOCKS);
+ md->blocks[md->num] = block + i;
+ md->num++;
+ if (md->num == EXT4_BB_MAX_BLOCKS) {
+ /* no more space, put full container on a sb's list */
+ db->bb_md_cur = NULL;
+ }
+ }
+ ext4_unlock_group(sb, group);
+ return 0;
+}
+
+/*
+ * Main entry point into mballoc to free blocks
+ */
+void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
+ unsigned long block, unsigned long count,
+ int metadata, unsigned long *freed)
+{
+ struct buffer_head *bitmap_bh = 0;
+ struct super_block *sb = inode->i_sb;
+ struct ext4_allocation_context ac;
+ struct ext4_group_desc *gdp;
+ struct ext4_super_block *es;
+ unsigned long overflow;
+ ext4_grpblk_t bit;
+ struct buffer_head *gd_bh;
+ ext4_group_t block_group;
+ struct ext4_sb_info *sbi;
+ struct ext4_buddy e4b;
+ int err = 0;
+ int ret;
+
+ *freed = 0;
+
+ ext4_mb_poll_new_transaction(sb, handle);
+
+ sbi = EXT4_SB(sb);
+ es = EXT4_SB(sb)->s_es;
+ if (block < le32_to_cpu(es->s_first_data_block) ||
+ block + count < block ||
+ block + count > ext4_blocks_count(es)) {
+ ext4_error(sb, __FUNCTION__,
+ "Freeing blocks not in datazone - "
+ "block = %lu, count = %lu", block, count);
+ goto error_return;
+ }
+
+ ext4_debug("freeing block %lu\n", block);
+
+ ac.ac_op = EXT4_MB_HISTORY_FREE;
+ ac.ac_inode = inode;
+ ac.ac_sb = sb;
+
+do_more:
+ overflow = 0;
+ ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
+
+ /*
+ * Check to see if we are freeing blocks across a group
+ * boundary.
+ */
+ if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) {
+ overflow = bit + count - EXT4_BLOCKS_PER_GROUP(sb);
+ count -= overflow;
+ }
+ bitmap_bh = read_block_bitmap(sb, block_group);
+ if (!bitmap_bh)
+ goto error_return;
+ gdp = ext4_get_group_desc(sb, block_group, &gd_bh);
+ if (!gdp)
+ goto error_return;
+
+ if (in_range(ext4_block_bitmap(sb, gdp), block, count) ||
+ in_range(ext4_inode_bitmap(sb, gdp), block, count) ||
+ in_range(block, ext4_inode_table(sb, gdp),
+ EXT4_SB(sb)->s_itb_per_group) ||
+ in_range(block + count - 1, ext4_inode_table(sb, gdp),
+ EXT4_SB(sb)->s_itb_per_group)) {
+
+ ext4_error(sb, __FUNCTION__,
+ "Freeing blocks in system zone - "
+ "Block = %lu, count = %lu", block, count);
+ }
+
+ BUFFER_TRACE(bitmap_bh, "getting write access");
+ err = ext4_journal_get_write_access(handle, bitmap_bh);
+ if (err)
+ goto error_return;
+
+ /*
+ * We are about to modify some metadata. Call the journal APIs
+ * to unshare ->b_data if a currently-committing transaction is
+ * using it
+ */
+ BUFFER_TRACE(gd_bh, "get_write_access");
+ err = ext4_journal_get_write_access(handle, gd_bh);
+ if (err)
+ goto error_return;
+
+ err = ext4_mb_load_buddy(sb, block_group, &e4b);
+ if (err)
+ goto error_return;
+
+#ifdef AGGRESSIVE_CHECK
+ {
+ int i;
+ for (i = 0; i < count; i++)
+ BUG_ON(!mb_test_bit(bit + i, bitmap_bh->b_data));
+ }
+#endif
+ mb_clear_bits(sb_bgl_lock(sbi, block_group), bitmap_bh->b_data,
+ bit, count);
+
+ /* We dirtied the bitmap block */
+ BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
+ err = ext4_journal_dirty_metadata(handle, bitmap_bh);
+
+ ac.ac_b_ex.fe_group = block_group;
+ ac.ac_b_ex.fe_start = bit;
+ ac.ac_b_ex.fe_len = count;
+ ext4_mb_store_history(&ac);
+
+ if (metadata) {
+ /* blocks being freed are metadata. these blocks shouldn't
+ * be used until this transaction is committed */
+ ext4_mb_free_metadata(handle, &e4b, block_group, bit, count);
+ } else {
+ ext4_lock_group(sb, block_group);
+ err = mb_free_blocks(inode, &e4b, bit, count);
+ ext4_mb_return_to_preallocation(inode, &e4b, block, count);
+ ext4_unlock_group(sb, block_group);
+ BUG_ON(err != 0);
+ }
+
+ spin_lock(sb_bgl_lock(sbi, block_group));
+ gdp->bg_free_blocks_count =
+ cpu_to_le16(le16_to_cpu(gdp->bg_free_blocks_count) + count);
+ gdp->bg_checksum = ext4_group_desc_csum(sbi, block_group, gdp);
+ spin_unlock(sb_bgl_lock(sbi, block_group));
+ percpu_counter_add(&sbi->s_freeblocks_counter, count);
+
+ ext4_mb_release_desc(&e4b);
+
+ *freed += count;
+
+ /* And the group descriptor block */
+ BUFFER_TRACE(gd_bh, "dirtied group descriptor block");
+ ret = ext4_journal_dirty_metadata(handle, gd_bh);
+ if (!err)
+ err = ret;
+
+ if (overflow && !err) {
+ block += count;
+ count = overflow;
+ put_bh(bitmap_bh);
+ goto do_more;
+ }
+ sb->s_dirt = 1;
+error_return:
+ brelse(bitmap_bh);
+ ext4_std_error(sb, err);
+ return;
+}
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
new file mode 100644
index 00000000000..3ebc2332f52
--- /dev/null
+++ b/fs/ext4/migrate.c
@@ -0,0 +1,560 @@
+/*
+ * Copyright IBM Corporation, 2007
+ * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/ext4_jbd2.h>
+#include <linux/ext4_fs_extents.h>
+
+/*
+ * The contiguous blocks details which can be
+ * represented by a single extent
+ */
+struct list_blocks_struct {
+ ext4_lblk_t first_block, last_block;
+ ext4_fsblk_t first_pblock, last_pblock;
+};
+
+static int finish_range(handle_t *handle, struct inode *inode,
+ struct list_blocks_struct *lb)
+
+{
+ int retval = 0, needed;
+ struct ext4_extent newext;
+ struct ext4_ext_path *path;
+ if (lb->first_pblock == 0)
+ return 0;
+
+ /* Add the extent to temp inode*/
+ newext.ee_block = cpu_to_le32(lb->first_block);
+ newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
+ ext4_ext_store_pblock(&newext, lb->first_pblock);
+ path = ext4_ext_find_extent(inode, lb->first_block, NULL);
+
+ if (IS_ERR(path)) {
+ retval = PTR_ERR(path);
+ goto err_out;
+ }
+
+ /*
+ * Calculate the credit needed to inserting this extent
+ * Since we are doing this in loop we may accumalate extra
+ * credit. But below we try to not accumalate too much
+ * of them by restarting the journal.
+ */
+ needed = ext4_ext_calc_credits_for_insert(inode, path);
+
+ /*
+ * Make sure the credit we accumalated is not really high
+ */
+ if (needed && handle->h_buffer_credits >= EXT4_RESERVE_TRANS_BLOCKS) {
+ retval = ext4_journal_restart(handle, needed);
+ if (retval)
+ goto err_out;
+ }
+ if (needed) {
+ retval = ext4_journal_extend(handle, needed);
+ if (retval != 0) {
+ /*
+ * IF not able to extend the journal restart the journal
+ */
+ retval = ext4_journal_restart(handle, needed);
+ if (retval)
+ goto err_out;
+ }
+ }
+ retval = ext4_ext_insert_extent(handle, inode, path, &newext);
+err_out:
+ lb->first_pblock = 0;
+ return retval;
+}
+
+static int update_extent_range(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t pblock, ext4_lblk_t blk_num,
+ struct list_blocks_struct *lb)
+{
+ int retval;
+ /*
+ * See if we can add on to the existing range (if it exists)
+ */
+ if (lb->first_pblock &&
+ (lb->last_pblock+1 == pblock) &&
+ (lb->last_block+1 == blk_num)) {
+ lb->last_pblock = pblock;
+ lb->last_block = blk_num;
+ return 0;
+ }
+ /*
+ * Start a new range.
+ */
+ retval = finish_range(handle, inode, lb);
+ lb->first_pblock = lb->last_pblock = pblock;
+ lb->first_block = lb->last_block = blk_num;
+
+ return retval;
+}
+
+static int update_ind_extent_range(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
+ struct list_blocks_struct *lb)
+{
+ struct buffer_head *bh;
+ __le32 *i_data;
+ int i, retval = 0;
+ ext4_lblk_t blk_count = *blk_nump;
+ unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
+
+ if (!pblock) {
+ /* Only update the file block number */
+ *blk_nump += max_entries;
+ return 0;
+ }
+
+ bh = sb_bread(inode->i_sb, pblock);
+ if (!bh)
+ return -EIO;
+
+ i_data = (__le32 *)bh->b_data;
+ for (i = 0; i < max_entries; i++, blk_count++) {
+ if (i_data[i]) {
+ retval = update_extent_range(handle, inode,
+ le32_to_cpu(i_data[i]),
+ blk_count, lb);
+ if (retval)
+ break;
+ }
+ }
+
+ /* Update the file block number */
+ *blk_nump = blk_count;
+ put_bh(bh);
+ return retval;
+
+}
+
+static int update_dind_extent_range(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
+ struct list_blocks_struct *lb)
+{
+ struct buffer_head *bh;
+ __le32 *i_data;
+ int i, retval = 0;
+ ext4_lblk_t blk_count = *blk_nump;
+ unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
+
+ if (!pblock) {
+ /* Only update the file block number */
+ *blk_nump += max_entries * max_entries;
+ return 0;
+ }
+ bh = sb_bread(inode->i_sb, pblock);
+ if (!bh)
+ return -EIO;
+
+ i_data = (__le32 *)bh->b_data;
+ for (i = 0; i < max_entries; i++) {
+ if (i_data[i]) {
+ retval = update_ind_extent_range(handle, inode,
+ le32_to_cpu(i_data[i]),
+ &blk_count, lb);
+ if (retval)
+ break;
+ } else {
+ /* Only update the file block number */
+ blk_count += max_entries;
+ }
+ }
+
+ /* Update the file block number */
+ *blk_nump = blk_count;
+ put_bh(bh);
+ return retval;
+
+}
+
+static int update_tind_extent_range(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
+ struct list_blocks_struct *lb)
+{
+ struct buffer_head *bh;
+ __le32 *i_data;
+ int i, retval = 0;
+ ext4_lblk_t blk_count = *blk_nump;
+ unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
+
+ if (!pblock) {
+ /* Only update the file block number */
+ *blk_nump += max_entries * max_entries * max_entries;
+ return 0;
+ }
+ bh = sb_bread(inode->i_sb, pblock);
+ if (!bh)
+ return -EIO;
+
+ i_data = (__le32 *)bh->b_data;
+ for (i = 0; i < max_entries; i++) {
+ if (i_data[i]) {
+ retval = update_dind_extent_range(handle, inode,
+ le32_to_cpu(i_data[i]),
+ &blk_count, lb);
+ if (retval)
+ break;
+ } else
+ /* Only update the file block number */
+ blk_count += max_entries * max_entries;
+ }
+ /* Update the file block number */
+ *blk_nump = blk_count;
+ put_bh(bh);
+ return retval;
+
+}
+
+static int free_dind_blocks(handle_t *handle,
+ struct inode *inode, __le32 i_data)
+{
+ int i;
+ __le32 *tmp_idata;
+ struct buffer_head *bh;
+ unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
+
+ bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
+ if (!bh)
+ return -EIO;
+
+ tmp_idata = (__le32 *)bh->b_data;
+ for (i = 0; i < max_entries; i++) {
+ if (tmp_idata[i])
+ ext4_free_blocks(handle, inode,
+ le32_to_cpu(tmp_idata[i]), 1, 1);
+ }
+ put_bh(bh);
+ ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1);
+ return 0;
+}
+
+static int free_tind_blocks(handle_t *handle,
+ struct inode *inode, __le32 i_data)
+{
+ int i, retval = 0;
+ __le32 *tmp_idata;
+ struct buffer_head *bh;
+ unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
+
+ bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
+ if (!bh)
+ return -EIO;
+
+ tmp_idata = (__le32 *)bh->b_data;
+ for (i = 0; i < max_entries; i++) {
+ if (tmp_idata[i]) {
+ retval = free_dind_blocks(handle,
+ inode, tmp_idata[i]);
+ if (retval) {
+ put_bh(bh);
+ return retval;
+ }
+ }
+ }
+ put_bh(bh);
+ ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1);
+ return 0;
+}
+
+static int free_ind_block(handle_t *handle, struct inode *inode)
+{
+ int retval;
+ struct ext4_inode_info *ei = EXT4_I(inode);
+
+ if (ei->i_data[EXT4_IND_BLOCK])
+ ext4_free_blocks(handle, inode,
+ le32_to_cpu(ei->i_data[EXT4_IND_BLOCK]), 1, 1);
+
+ if (ei->i_data[EXT4_DIND_BLOCK]) {
+ retval = free_dind_blocks(handle, inode,
+ ei->i_data[EXT4_DIND_BLOCK]);
+ if (retval)
+ return retval;
+ }
+
+ if (ei->i_data[EXT4_TIND_BLOCK]) {
+ retval = free_tind_blocks(handle, inode,
+ ei->i_data[EXT4_TIND_BLOCK]);
+ if (retval)
+ return retval;
+ }
+ return 0;
+}
+
+static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
+ struct inode *tmp_inode, int retval)
+{
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
+
+ retval = free_ind_block(handle, inode);
+ if (retval)
+ goto err_out;
+
+ /*
+ * One credit accounted for writing the
+ * i_data field of the original inode
+ */
+ retval = ext4_journal_extend(handle, 1);
+ if (retval != 0) {
+ retval = ext4_journal_restart(handle, 1);
+ if (retval)
+ goto err_out;
+ }
+
+ /*
+ * We have the extent map build with the tmp inode.
+ * Now copy the i_data across
+ */
+ ei->i_flags |= EXT4_EXTENTS_FL;
+ memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
+
+ /*
+ * Update i_blocks with the new blocks that got
+ * allocated while adding extents for extent index
+ * blocks.
+ *
+ * While converting to extents we need not
+ * update the orignal inode i_blocks for extent blocks
+ * via quota APIs. The quota update happened via tmp_inode already.
+ */
+ spin_lock(&inode->i_lock);
+ inode->i_blocks += tmp_inode->i_blocks;
+ spin_unlock(&inode->i_lock);
+
+ ext4_mark_inode_dirty(handle, inode);
+err_out:
+ return retval;
+}
+
+static int free_ext_idx(handle_t *handle, struct inode *inode,
+ struct ext4_extent_idx *ix)
+{
+ int i, retval = 0;
+ ext4_fsblk_t block;
+ struct buffer_head *bh;
+ struct ext4_extent_header *eh;
+
+ block = idx_pblock(ix);
+ bh = sb_bread(inode->i_sb, block);
+ if (!bh)
+ return -EIO;
+
+ eh = (struct ext4_extent_header *)bh->b_data;
+ if (eh->eh_depth != 0) {
+ ix = EXT_FIRST_INDEX(eh);
+ for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
+ retval = free_ext_idx(handle, inode, ix);
+ if (retval)
+ break;
+ }
+ }
+ put_bh(bh);
+ ext4_free_blocks(handle, inode, block, 1, 1);
+ return retval;
+}
+
+/*
+ * Free the extent meta data blocks only
+ */
+static int free_ext_block(handle_t *handle, struct inode *inode)
+{
+ int i, retval = 0;
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
+ struct ext4_extent_idx *ix;
+ if (eh->eh_depth == 0)
+ /*
+ * No extra blocks allocated for extent meta data
+ */
+ return 0;
+ ix = EXT_FIRST_INDEX(eh);
+ for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
+ retval = free_ext_idx(handle, inode, ix);
+ if (retval)
+ return retval;
+ }
+ return retval;
+
+}
+
+int ext4_ext_migrate(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ handle_t *handle;
+ int retval = 0, i;
+ __le32 *i_data;
+ ext4_lblk_t blk_count = 0;
+ struct ext4_inode_info *ei;
+ struct inode *tmp_inode = NULL;
+ struct list_blocks_struct lb;
+ unsigned long max_entries;
+
+ if (!test_opt(inode->i_sb, EXTENTS))
+ /*
+ * if mounted with noextents we don't allow the migrate
+ */
+ return -EINVAL;
+
+ if ((EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
+ return -EINVAL;
+
+ down_write(&EXT4_I(inode)->i_data_sem);
+ handle = ext4_journal_start(inode,
+ EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
+ EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
+ 2 * EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)
+ + 1);
+ if (IS_ERR(handle)) {
+ retval = PTR_ERR(handle);
+ goto err_out;
+ }
+ tmp_inode = ext4_new_inode(handle,
+ inode->i_sb->s_root->d_inode,
+ S_IFREG);
+ if (IS_ERR(tmp_inode)) {
+ retval = -ENOMEM;
+ ext4_journal_stop(handle);
+ tmp_inode = NULL;
+ goto err_out;
+ }
+ i_size_write(tmp_inode, i_size_read(inode));
+ /*
+ * We don't want the inode to be reclaimed
+ * if we got interrupted in between. We have
+ * this tmp inode carrying reference to the
+ * data blocks of the original file. We set
+ * the i_nlink to zero at the last stage after
+ * switching the original file to extent format
+ */
+ tmp_inode->i_nlink = 1;
+
+ ext4_ext_tree_init(handle, tmp_inode);
+ ext4_orphan_add(handle, tmp_inode);
+ ext4_journal_stop(handle);
+
+ ei = EXT4_I(inode);
+ i_data = ei->i_data;
+ memset(&lb, 0, sizeof(lb));
+
+ /* 32 bit block address 4 bytes */
+ max_entries = inode->i_sb->s_blocksize >> 2;
+
+ /*
+ * start with one credit accounted for
+ * superblock modification.
+ *
+ * For the tmp_inode we already have commited the
+ * trascation that created the inode. Later as and
+ * when we add extents we extent the journal
+ */
+ handle = ext4_journal_start(inode, 1);
+ for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
+ if (i_data[i]) {
+ retval = update_extent_range(handle, tmp_inode,
+ le32_to_cpu(i_data[i]),
+ blk_count, &lb);
+ if (retval)
+ goto err_out;
+ }
+ }
+ if (i_data[EXT4_IND_BLOCK]) {
+ retval = update_ind_extent_range(handle, tmp_inode,
+ le32_to_cpu(i_data[EXT4_IND_BLOCK]),
+ &blk_count, &lb);
+ if (retval)
+ goto err_out;
+ } else
+ blk_count += max_entries;
+ if (i_data[EXT4_DIND_BLOCK]) {
+ retval = update_dind_extent_range(handle, tmp_inode,
+ le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
+ &blk_count, &lb);
+ if (retval)
+ goto err_out;
+ } else
+ blk_count += max_entries * max_entries;
+ if (i_data[EXT4_TIND_BLOCK]) {
+ retval = update_tind_extent_range(handle, tmp_inode,
+ le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
+ &blk_count, &lb);
+ if (retval)
+ goto err_out;
+ }
+ /*
+ * Build the last extent
+ */
+ retval = finish_range(handle, tmp_inode, &lb);
+err_out:
+ /*
+ * We are either freeing extent information or indirect
+ * blocks. During this we touch superblock, group descriptor
+ * and block bitmap. Later we mark the tmp_inode dirty
+ * via ext4_ext_tree_init. So allocate a credit of 4
+ * We may update quota (user and group).
+ *
+ * FIXME!! we may be touching bitmaps in different block groups.
+ */
+ if (ext4_journal_extend(handle,
+ 4 + 2*EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb)) != 0)
+ ext4_journal_restart(handle,
+ 4 + 2*EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb));
+ if (retval)
+ /*
+ * Failure case delete the extent information with the
+ * tmp_inode
+ */
+ free_ext_block(handle, tmp_inode);
+ else
+ retval = ext4_ext_swap_inode_data(handle, inode,
+ tmp_inode, retval);
+
+ /*
+ * Mark the tmp_inode as of size zero
+ */
+ i_size_write(tmp_inode, 0);
+
+ /*
+ * set the i_blocks count to zero
+ * so that the ext4_delete_inode does the
+ * right job
+ *
+ * We don't need to take the i_lock because
+ * the inode is not visible to user space.
+ */
+ tmp_inode->i_blocks = 0;
+
+ /* Reset the extent details */
+ ext4_ext_tree_init(handle, tmp_inode);
+
+ /*
+ * Set the i_nlink to zero so that
+ * generic_drop_inode really deletes the
+ * inode
+ */
+ tmp_inode->i_nlink = 0;
+
+ ext4_journal_stop(handle);
+
+ up_write(&EXT4_I(inode)->i_data_sem);
+
+ if (tmp_inode)
+ iput(tmp_inode);
+
+ return retval;
+}
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 94ee6f315dc..67b6d8a1cef 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -51,7 +51,7 @@
static struct buffer_head *ext4_append(handle_t *handle,
struct inode *inode,
- u32 *block, int *err)
+ ext4_lblk_t *block, int *err)
{
struct buffer_head *bh;
@@ -144,8 +144,8 @@ struct dx_map_entry
u16 size;
};
-static inline unsigned dx_get_block (struct dx_entry *entry);
-static void dx_set_block (struct dx_entry *entry, unsigned value);
+static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
+static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
static inline unsigned dx_get_hash (struct dx_entry *entry);
static void dx_set_hash (struct dx_entry *entry, unsigned value);
static unsigned dx_get_count (struct dx_entry *entries);
@@ -166,7 +166,8 @@ static void dx_sort_map(struct dx_map_entry *map, unsigned count);
static struct ext4_dir_entry_2 *dx_move_dirents (char *from, char *to,
struct dx_map_entry *offsets, int count);
static struct ext4_dir_entry_2* dx_pack_dirents (char *base, int size);
-static void dx_insert_block (struct dx_frame *frame, u32 hash, u32 block);
+static void dx_insert_block(struct dx_frame *frame,
+ u32 hash, ext4_lblk_t block);
static int ext4_htree_next_block(struct inode *dir, __u32 hash,
struct dx_frame *frame,
struct dx_frame *frames,
@@ -181,12 +182,12 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
* Mask them off for now.
*/
-static inline unsigned dx_get_block (struct dx_entry *entry)
+static inline ext4_lblk_t dx_get_block(struct dx_entry *entry)
{
return le32_to_cpu(entry->block) & 0x00ffffff;
}
-static inline void dx_set_block (struct dx_entry *entry, unsigned value)
+static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
{
entry->block = cpu_to_le32(value);
}
@@ -243,8 +244,8 @@ static void dx_show_index (char * label, struct dx_entry *entries)
int i, n = dx_get_count (entries);
printk("%s index ", label);
for (i = 0; i < n; i++) {
- printk("%x->%u ", i? dx_get_hash(entries + i) :
- 0, dx_get_block(entries + i));
+ printk("%x->%lu ", i? dx_get_hash(entries + i) :
+ 0, (unsigned long)dx_get_block(entries + i));
}
printk("\n");
}
@@ -280,7 +281,7 @@ static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext4_dir_ent
space += EXT4_DIR_REC_LEN(de->name_len);
names++;
}
- de = (struct ext4_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext4_next_entry(de);
}
printk("(%i)\n", names);
return (struct stats) { names, space, 1 };
@@ -297,7 +298,8 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
printk("%i indexed blocks...\n", count);
for (i = 0; i < count; i++, entries++)
{
- u32 block = dx_get_block(entries), hash = i? dx_get_hash(entries): 0;
+ ext4_lblk_t block = dx_get_block(entries);
+ ext4_lblk_t hash = i ? dx_get_hash(entries): 0;
u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
struct stats stats;
printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
@@ -551,7 +553,8 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash,
*/
static inline struct ext4_dir_entry_2 *ext4_next_entry(struct ext4_dir_entry_2 *p)
{
- return (struct ext4_dir_entry_2 *)((char*)p + le16_to_cpu(p->rec_len));
+ return (struct ext4_dir_entry_2 *)((char *)p +
+ ext4_rec_len_from_disk(p->rec_len));
}
/*
@@ -560,7 +563,7 @@ static inline struct ext4_dir_entry_2 *ext4_next_entry(struct ext4_dir_entry_2 *
* into the tree. If there is an error it is returned in err.
*/
static int htree_dirblock_to_tree(struct file *dir_file,
- struct inode *dir, int block,
+ struct inode *dir, ext4_lblk_t block,
struct dx_hash_info *hinfo,
__u32 start_hash, __u32 start_minor_hash)
{
@@ -568,7 +571,8 @@ static int htree_dirblock_to_tree(struct file *dir_file,
struct ext4_dir_entry_2 *de, *top;
int err, count = 0;
- dxtrace(printk("In htree dirblock_to_tree: block %d\n", block));
+ dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
+ (unsigned long)block));
if (!(bh = ext4_bread (NULL, dir, block, 0, &err)))
return err;
@@ -620,9 +624,9 @@ int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
struct ext4_dir_entry_2 *de;
struct dx_frame frames[2], *frame;
struct inode *dir;
- int block, err;
+ ext4_lblk_t block;
int count = 0;
- int ret;
+ int ret, err;
__u32 hashval;
dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash,
@@ -720,7 +724,7 @@ static int dx_make_map (struct ext4_dir_entry_2 *de, int size,
cond_resched();
}
/* XXX: do we need to check rec_len == 0 case? -Chris */
- de = (struct ext4_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext4_next_entry(de);
}
return count;
}
@@ -752,7 +756,7 @@ static void dx_sort_map (struct dx_map_entry *map, unsigned count)
} while(more);
}
-static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block)
+static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
{
struct dx_entry *entries = frame->entries;
struct dx_entry *old = frame->at, *new = old + 1;
@@ -820,7 +824,7 @@ static inline int search_dirblock(struct buffer_head * bh,
return 1;
}
/* prevent looping on a bad block */
- de_len = le16_to_cpu(de->rec_len);
+ de_len = ext4_rec_len_from_disk(de->rec_len);
if (de_len <= 0)
return -1;
offset += de_len;
@@ -847,23 +851,20 @@ static struct buffer_head * ext4_find_entry (struct dentry *dentry,
struct super_block * sb;
struct buffer_head * bh_use[NAMEI_RA_SIZE];
struct buffer_head * bh, *ret = NULL;
- unsigned long start, block, b;
+ ext4_lblk_t start, block, b;
int ra_max = 0; /* Number of bh's in the readahead
buffer, bh_use[] */
int ra_ptr = 0; /* Current index into readahead
buffer */
int num = 0;
- int nblocks, i, err;
+ ext4_lblk_t nblocks;
+ int i, err;
struct inode *dir = dentry->d_parent->d_inode;
int namelen;
- const u8 *name;
- unsigned blocksize;
*res_dir = NULL;
sb = dir->i_sb;
- blocksize = sb->s_blocksize;
namelen = dentry->d_name.len;
- name = dentry->d_name.name;
if (namelen > EXT4_NAME_LEN)
return NULL;
if (is_dx(dir)) {
@@ -914,7 +915,8 @@ restart:
if (!buffer_uptodate(bh)) {
/* read error, skip block & hope for the best */
ext4_error(sb, __FUNCTION__, "reading directory #%lu "
- "offset %lu", dir->i_ino, block);
+ "offset %lu", dir->i_ino,
+ (unsigned long)block);
brelse(bh);
goto next;
}
@@ -961,7 +963,7 @@ static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry,
struct dx_frame frames[2], *frame;
struct ext4_dir_entry_2 *de, *top;
struct buffer_head *bh;
- unsigned long block;
+ ext4_lblk_t block;
int retval;
int namelen = dentry->d_name.len;
const u8 *name = dentry->d_name.name;
@@ -1128,7 +1130,7 @@ dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
rec_len = EXT4_DIR_REC_LEN(de->name_len);
memcpy (to, de, rec_len);
((struct ext4_dir_entry_2 *) to)->rec_len =
- cpu_to_le16(rec_len);
+ ext4_rec_len_to_disk(rec_len);
de->inode = 0;
map++;
to += rec_len;
@@ -1147,13 +1149,12 @@ static struct ext4_dir_entry_2* dx_pack_dirents(char *base, int size)
prev = to = de;
while ((char*)de < base + size) {
- next = (struct ext4_dir_entry_2 *) ((char *) de +
- le16_to_cpu(de->rec_len));
+ next = ext4_next_entry(de);
if (de->inode && de->name_len) {
rec_len = EXT4_DIR_REC_LEN(de->name_len);
if (de > to)
memmove(to, de, rec_len);
- to->rec_len = cpu_to_le16(rec_len);
+ to->rec_len = ext4_rec_len_to_disk(rec_len);
prev = to;
to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
}
@@ -1174,7 +1175,7 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
unsigned blocksize = dir->i_sb->s_blocksize;
unsigned count, continued;
struct buffer_head *bh2;
- u32 newblock;
+ ext4_lblk_t newblock;
u32 hash2;
struct dx_map_entry *map;
char *data1 = (*bh)->b_data, *data2;
@@ -1221,14 +1222,15 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
split = count - move;
hash2 = map[split].hash;
continued = hash2 == map[split - 1].hash;
- dxtrace(printk("Split block %i at %x, %i/%i\n",
- dx_get_block(frame->at), hash2, split, count-split));
+ dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
+ (unsigned long)dx_get_block(frame->at),
+ hash2, split, count-split));
/* Fancy dance to stay within two buffers */
de2 = dx_move_dirents(data1, data2, map + split, count - split);
de = dx_pack_dirents(data1,blocksize);
- de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de);
- de2->rec_len = cpu_to_le16(data2 + blocksize - (char *) de2);
+ de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de);
+ de2->rec_len = ext4_rec_len_to_disk(data2 + blocksize - (char *) de2);
dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data1, blocksize, 1));
dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1));
@@ -1297,7 +1299,7 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
return -EEXIST;
}
nlen = EXT4_DIR_REC_LEN(de->name_len);
- rlen = le16_to_cpu(de->rec_len);
+ rlen = ext4_rec_len_from_disk(de->rec_len);
if ((de->inode? rlen - nlen: rlen) >= reclen)
break;
de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
@@ -1316,11 +1318,11 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
/* By now the buffer is marked for journaling */
nlen = EXT4_DIR_REC_LEN(de->name_len);
- rlen = le16_to_cpu(de->rec_len);
+ rlen = ext4_rec_len_from_disk(de->rec_len);
if (de->inode) {
struct ext4_dir_entry_2 *de1 = (struct ext4_dir_entry_2 *)((char *)de + nlen);
- de1->rec_len = cpu_to_le16(rlen - nlen);
- de->rec_len = cpu_to_le16(nlen);
+ de1->rec_len = ext4_rec_len_to_disk(rlen - nlen);
+ de->rec_len = ext4_rec_len_to_disk(nlen);
de = de1;
}
de->file_type = EXT4_FT_UNKNOWN;
@@ -1374,7 +1376,7 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
int retval;
unsigned blocksize;
struct dx_hash_info hinfo;
- u32 block;
+ ext4_lblk_t block;
struct fake_dirent *fde;
blocksize = dir->i_sb->s_blocksize;
@@ -1397,17 +1399,18 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
/* The 0th block becomes the root, move the dirents out */
fde = &root->dotdot;
- de = (struct ext4_dir_entry_2 *)((char *)fde + le16_to_cpu(fde->rec_len));
+ de = (struct ext4_dir_entry_2 *)((char *)fde +
+ ext4_rec_len_from_disk(fde->rec_len));
len = ((char *) root) + blocksize - (char *) de;
memcpy (data1, de, len);
de = (struct ext4_dir_entry_2 *) data1;
top = data1 + len;
- while ((char *)(de2=(void*)de+le16_to_cpu(de->rec_len)) < top)
+ while ((char *)(de2 = ext4_next_entry(de)) < top)
de = de2;
- de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de);
+ de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de);
/* Initialize the root; the dot dirents already exist */
de = (struct ext4_dir_entry_2 *) (&root->dotdot);
- de->rec_len = cpu_to_le16(blocksize - EXT4_DIR_REC_LEN(2));
+ de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2));
memset (&root->info, 0, sizeof(root->info));
root->info.info_length = sizeof(root->info);
root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
@@ -1454,7 +1457,7 @@ static int ext4_add_entry (handle_t *handle, struct dentry *dentry,
int retval;
int dx_fallback=0;
unsigned blocksize;
- u32 block, blocks;
+ ext4_lblk_t block, blocks;
sb = dir->i_sb;
blocksize = sb->s_blocksize;
@@ -1487,7 +1490,7 @@ static int ext4_add_entry (handle_t *handle, struct dentry *dentry,
return retval;
de = (struct ext4_dir_entry_2 *) bh->b_data;
de->inode = 0;
- de->rec_len = cpu_to_le16(blocksize);
+ de->rec_len = ext4_rec_len_to_disk(blocksize);
return add_dirent_to_buf(handle, dentry, inode, de, bh);
}
@@ -1531,7 +1534,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
dx_get_count(entries), dx_get_limit(entries)));
/* Need to split index? */
if (dx_get_count(entries) == dx_get_limit(entries)) {
- u32 newblock;
+ ext4_lblk_t newblock;
unsigned icount = dx_get_count(entries);
int levels = frame - frames;
struct dx_entry *entries2;
@@ -1550,7 +1553,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
goto cleanup;
node2 = (struct dx_node *)(bh2->b_data);
entries2 = node2->entries;
- node2->fake.rec_len = cpu_to_le16(sb->s_blocksize);
+ node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize);
node2->fake.inode = 0;
BUFFER_TRACE(frame->bh, "get_write_access");
err = ext4_journal_get_write_access(handle, frame->bh);
@@ -1648,9 +1651,9 @@ static int ext4_delete_entry (handle_t *handle,
BUFFER_TRACE(bh, "get_write_access");
ext4_journal_get_write_access(handle, bh);
if (pde)
- pde->rec_len =
- cpu_to_le16(le16_to_cpu(pde->rec_len) +
- le16_to_cpu(de->rec_len));
+ pde->rec_len = ext4_rec_len_to_disk(
+ ext4_rec_len_from_disk(pde->rec_len) +
+ ext4_rec_len_from_disk(de->rec_len));
else
de->inode = 0;
dir->i_version++;
@@ -1658,10 +1661,9 @@ static int ext4_delete_entry (handle_t *handle,
ext4_journal_dirty_metadata(handle, bh);
return 0;
}
- i += le16_to_cpu(de->rec_len);
+ i += ext4_rec_len_from_disk(de->rec_len);
pde = de;
- de = (struct ext4_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext4_next_entry(de);
}
return -ENOENT;
}
@@ -1824,13 +1826,13 @@ retry:
de = (struct ext4_dir_entry_2 *) dir_block->b_data;
de->inode = cpu_to_le32(inode->i_ino);
de->name_len = 1;
- de->rec_len = cpu_to_le16(EXT4_DIR_REC_LEN(de->name_len));
+ de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len));
strcpy (de->name, ".");
ext4_set_de_type(dir->i_sb, de, S_IFDIR);
- de = (struct ext4_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext4_next_entry(de);
de->inode = cpu_to_le32(dir->i_ino);
- de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize-EXT4_DIR_REC_LEN(1));
+ de->rec_len = ext4_rec_len_to_disk(inode->i_sb->s_blocksize -
+ EXT4_DIR_REC_LEN(1));
de->name_len = 2;
strcpy (de->name, "..");
ext4_set_de_type(dir->i_sb, de, S_IFDIR);
@@ -1882,8 +1884,7 @@ static int empty_dir (struct inode * inode)
return 1;
}
de = (struct ext4_dir_entry_2 *) bh->b_data;
- de1 = (struct ext4_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de1 = ext4_next_entry(de);
if (le32_to_cpu(de->inode) != inode->i_ino ||
!le32_to_cpu(de1->inode) ||
strcmp (".", de->name) ||
@@ -1894,9 +1895,9 @@ static int empty_dir (struct inode * inode)
brelse (bh);
return 1;
}
- offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
- de = (struct ext4_dir_entry_2 *)
- ((char *) de1 + le16_to_cpu(de1->rec_len));
+ offset = ext4_rec_len_from_disk(de->rec_len) +
+ ext4_rec_len_from_disk(de1->rec_len);
+ de = ext4_next_entry(de1);
while (offset < inode->i_size ) {
if (!bh ||
(void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
@@ -1925,9 +1926,8 @@ static int empty_dir (struct inode * inode)
brelse (bh);
return 0;
}
- offset += le16_to_cpu(de->rec_len);
- de = (struct ext4_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ offset += ext4_rec_len_from_disk(de->rec_len);
+ de = ext4_next_entry(de);
}
brelse (bh);
return 1;
@@ -2282,8 +2282,7 @@ retry:
}
#define PARENT_INO(buffer) \
- ((struct ext4_dir_entry_2 *) ((char *) buffer + \
- le16_to_cpu(((struct ext4_dir_entry_2 *) buffer)->rec_len)))->inode
+ (ext4_next_entry((struct ext4_dir_entry_2 *)(buffer))->inode)
/*
* Anybody can rename anything with this: the permission checks are left to the
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index bd8a52bb399..4fbba60816f 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -28,7 +28,7 @@ static int verify_group_input(struct super_block *sb,
struct ext4_super_block *es = sbi->s_es;
ext4_fsblk_t start = ext4_blocks_count(es);
ext4_fsblk_t end = start + input->blocks_count;
- unsigned group = input->group;
+ ext4_group_t group = input->group;
ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
unsigned overhead = ext4_bg_has_super(sb, group) ?
(1 + ext4_bg_num_gdb(sb, group) +
@@ -206,7 +206,7 @@ static int setup_new_group_blocks(struct super_block *sb,
}
if (ext4_bg_has_super(sb, input->group)) {
- ext4_debug("mark backup superblock %#04lx (+0)\n", start);
+ ext4_debug("mark backup superblock %#04llx (+0)\n", start);
ext4_set_bit(0, bh->b_data);
}
@@ -215,7 +215,7 @@ static int setup_new_group_blocks(struct super_block *sb,
i < gdblocks; i++, block++, bit++) {
struct buffer_head *gdb;
- ext4_debug("update backup group %#04lx (+%d)\n", block, bit);
+ ext4_debug("update backup group %#04llx (+%d)\n", block, bit);
if ((err = extend_or_restart_transaction(handle, 1, bh)))
goto exit_bh;
@@ -243,7 +243,7 @@ static int setup_new_group_blocks(struct super_block *sb,
i < reserved_gdb; i++, block++, bit++) {
struct buffer_head *gdb;
- ext4_debug("clear reserved block %#04lx (+%d)\n", block, bit);
+ ext4_debug("clear reserved block %#04llx (+%d)\n", block, bit);
if ((err = extend_or_restart_transaction(handle, 1, bh)))
goto exit_bh;
@@ -256,10 +256,10 @@ static int setup_new_group_blocks(struct super_block *sb,
ext4_set_bit(bit, bh->b_data);
brelse(gdb);
}
- ext4_debug("mark block bitmap %#04x (+%ld)\n", input->block_bitmap,
+ ext4_debug("mark block bitmap %#04llx (+%llu)\n", input->block_bitmap,
input->block_bitmap - start);
ext4_set_bit(input->block_bitmap - start, bh->b_data);
- ext4_debug("mark inode bitmap %#04x (+%ld)\n", input->inode_bitmap,
+ ext4_debug("mark inode bitmap %#04llx (+%llu)\n", input->inode_bitmap,
input->inode_bitmap - start);
ext4_set_bit(input->inode_bitmap - start, bh->b_data);
@@ -268,7 +268,7 @@ static int setup_new_group_blocks(struct super_block *sb,
i < sbi->s_itb_per_group; i++, bit++, block++) {
struct buffer_head *it;
- ext4_debug("clear inode block %#04lx (+%d)\n", block, bit);
+ ext4_debug("clear inode block %#04llx (+%d)\n", block, bit);
if ((err = extend_or_restart_transaction(handle, 1, bh)))
goto exit_bh;
@@ -291,7 +291,7 @@ static int setup_new_group_blocks(struct super_block *sb,
brelse(bh);
/* Mark unused entries in inode bitmap used */
- ext4_debug("clear inode bitmap %#04x (+%ld)\n",
+ ext4_debug("clear inode bitmap %#04llx (+%llu)\n",
input->inode_bitmap, input->inode_bitmap - start);
if (IS_ERR(bh = bclean(handle, sb, input->inode_bitmap))) {
err = PTR_ERR(bh);
@@ -357,7 +357,7 @@ static int verify_reserved_gdb(struct super_block *sb,
struct buffer_head *primary)
{
const ext4_fsblk_t blk = primary->b_blocknr;
- const unsigned long end = EXT4_SB(sb)->s_groups_count;
+ const ext4_group_t end = EXT4_SB(sb)->s_groups_count;
unsigned three = 1;
unsigned five = 5;
unsigned seven = 7;
@@ -656,12 +656,12 @@ static void update_backups(struct super_block *sb,
int blk_off, char *data, int size)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
- const unsigned long last = sbi->s_groups_count;
+ const ext4_group_t last = sbi->s_groups_count;
const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
unsigned three = 1;
unsigned five = 5;
unsigned seven = 7;
- unsigned group;
+ ext4_group_t group;
int rest = sb->s_blocksize - size;
handle_t *handle;
int err = 0, err2;
@@ -716,7 +716,7 @@ static void update_backups(struct super_block *sb,
exit_err:
if (err) {
ext4_warning(sb, __FUNCTION__,
- "can't update backup for group %d (err %d), "
+ "can't update backup for group %lu (err %d), "
"forcing fsck on next reboot", group, err);
sbi->s_mount_state &= ~EXT4_VALID_FS;
sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
@@ -952,7 +952,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
ext4_fsblk_t n_blocks_count)
{
ext4_fsblk_t o_blocks_count;
- unsigned long o_groups_count;
+ ext4_group_t o_groups_count;
ext4_grpblk_t last;
ext4_grpblk_t add;
struct buffer_head * bh;
@@ -1054,7 +1054,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh);
sb->s_dirt = 1;
unlock_super(sb);
- ext4_debug("freeing blocks %lu through %llu\n", o_blocks_count,
+ ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
o_blocks_count + add);
ext4_free_blocks_sb(handle, sb, o_blocks_count, add, &freed_blocks);
ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1ca0f546c46..055a0cd0168 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -373,6 +373,66 @@ void ext4_update_dynamic_rev(struct super_block *sb)
*/
}
+int ext4_update_compat_feature(handle_t *handle,
+ struct super_block *sb, __u32 compat)
+{
+ int err = 0;
+ if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
+ err = ext4_journal_get_write_access(handle,
+ EXT4_SB(sb)->s_sbh);
+ if (err)
+ return err;
+ EXT4_SET_COMPAT_FEATURE(sb, compat);
+ sb->s_dirt = 1;
+ handle->h_sync = 1;
+ BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
+ "call ext4_journal_dirty_met adata");
+ err = ext4_journal_dirty_metadata(handle,
+ EXT4_SB(sb)->s_sbh);
+ }
+ return err;
+}
+
+int ext4_update_rocompat_feature(handle_t *handle,
+ struct super_block *sb, __u32 rocompat)
+{
+ int err = 0;
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
+ err = ext4_journal_get_write_access(handle,
+ EXT4_SB(sb)->s_sbh);
+ if (err)
+ return err;
+ EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
+ sb->s_dirt = 1;
+ handle->h_sync = 1;
+ BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
+ "call ext4_journal_dirty_met adata");
+ err = ext4_journal_dirty_metadata(handle,
+ EXT4_SB(sb)->s_sbh);
+ }
+ return err;
+}
+
+int ext4_update_incompat_feature(handle_t *handle,
+ struct super_block *sb, __u32 incompat)
+{
+ int err = 0;
+ if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
+ err = ext4_journal_get_write_access(handle,
+ EXT4_SB(sb)->s_sbh);
+ if (err)
+ return err;
+ EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
+ sb->s_dirt = 1;
+ handle->h_sync = 1;
+ BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
+ "call ext4_journal_dirty_met adata");
+ err = ext4_journal_dirty_metadata(handle,
+ EXT4_SB(sb)->s_sbh);
+ }
+ return err;
+}
+
/*
* Open the external journal device
*/
@@ -443,6 +503,7 @@ static void ext4_put_super (struct super_block * sb)
struct ext4_super_block *es = sbi->s_es;
int i;
+ ext4_mb_release(sb);
ext4_ext_release(sb);
ext4_xattr_put_super(sb);
jbd2_journal_destroy(sbi->s_journal);
@@ -509,6 +570,8 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
ei->i_block_alloc_info = NULL;
ei->vfs_inode.i_version = 1;
memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
+ INIT_LIST_HEAD(&ei->i_prealloc_list);
+ spin_lock_init(&ei->i_prealloc_lock);
return &ei->vfs_inode;
}
@@ -533,7 +596,7 @@ static void init_once(struct kmem_cache *cachep, void *foo)
#ifdef CONFIG_EXT4DEV_FS_XATTR
init_rwsem(&ei->xattr_sem);
#endif
- mutex_init(&ei->truncate_mutex);
+ init_rwsem(&ei->i_data_sem);
inode_init_once(&ei->vfs_inode);
}
@@ -605,18 +668,20 @@ static inline void ext4_show_quota_options(struct seq_file *seq, struct super_bl
*/
static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
+ int def_errors;
+ unsigned long def_mount_opts;
struct super_block *sb = vfs->mnt_sb;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
- unsigned long def_mount_opts;
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
+ def_errors = le16_to_cpu(es->s_errors);
if (sbi->s_sb_block != 1)
seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
if (test_opt(sb, MINIX_DF))
seq_puts(seq, ",minixdf");
- if (test_opt(sb, GRPID))
+ if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
seq_puts(seq, ",grpid");
if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
seq_puts(seq, ",nogrpid");
@@ -628,34 +693,33 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
seq_printf(seq, ",resgid=%u", sbi->s_resgid);
}
- if (test_opt(sb, ERRORS_CONT)) {
- int def_errors = le16_to_cpu(es->s_errors);
-
+ if (test_opt(sb, ERRORS_RO)) {
if (def_errors == EXT4_ERRORS_PANIC ||
- def_errors == EXT4_ERRORS_RO) {
- seq_puts(seq, ",errors=continue");
+ def_errors == EXT4_ERRORS_CONTINUE) {
+ seq_puts(seq, ",errors=remount-ro");
}
}
- if (test_opt(sb, ERRORS_RO))
- seq_puts(seq, ",errors=remount-ro");
- if (test_opt(sb, ERRORS_PANIC))
+ if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
+ seq_puts(seq, ",errors=continue");
+ if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
seq_puts(seq, ",errors=panic");
- if (test_opt(sb, NO_UID32))
+ if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
seq_puts(seq, ",nouid32");
- if (test_opt(sb, DEBUG))
+ if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
seq_puts(seq, ",debug");
if (test_opt(sb, OLDALLOC))
seq_puts(seq, ",oldalloc");
-#ifdef CONFIG_EXT4_FS_XATTR
- if (test_opt(sb, XATTR_USER))
+#ifdef CONFIG_EXT4DEV_FS_XATTR
+ if (test_opt(sb, XATTR_USER) &&
+ !(def_mount_opts & EXT4_DEFM_XATTR_USER))
seq_puts(seq, ",user_xattr");
if (!test_opt(sb, XATTR_USER) &&
(def_mount_opts & EXT4_DEFM_XATTR_USER)) {
seq_puts(seq, ",nouser_xattr");
}
#endif
-#ifdef CONFIG_EXT4_FS_POSIX_ACL
- if (test_opt(sb, POSIX_ACL))
+#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+ if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
seq_puts(seq, ",acl");
if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
seq_puts(seq, ",noacl");
@@ -672,7 +736,17 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_puts(seq, ",nobh");
if (!test_opt(sb, EXTENTS))
seq_puts(seq, ",noextents");
+ if (!test_opt(sb, MBALLOC))
+ seq_puts(seq, ",nomballoc");
+ if (test_opt(sb, I_VERSION))
+ seq_puts(seq, ",i_version");
+ if (sbi->s_stripe)
+ seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
+ /*
+ * journal mode get enabled in different ways
+ * So just print the value even if we didn't specify it
+ */
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
seq_puts(seq, ",data=journal");
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
@@ -681,7 +755,6 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_puts(seq, ",data=writeback");
ext4_show_quota_options(seq, sb);
-
return 0;
}
@@ -809,11 +882,13 @@ enum {
Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
+ Opt_journal_checksum, Opt_journal_async_commit,
Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
- Opt_grpquota, Opt_extents, Opt_noextents,
+ Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
+ Opt_mballoc, Opt_nomballoc, Opt_stripe,
};
static match_table_t tokens = {
@@ -848,6 +923,8 @@ static match_table_t tokens = {
{Opt_journal_update, "journal=update"},
{Opt_journal_inum, "journal=%u"},
{Opt_journal_dev, "journal_dev=%u"},
+ {Opt_journal_checksum, "journal_checksum"},
+ {Opt_journal_async_commit, "journal_async_commit"},
{Opt_abort, "abort"},
{Opt_data_journal, "data=journal"},
{Opt_data_ordered, "data=ordered"},
@@ -865,6 +942,10 @@ static match_table_t tokens = {
{Opt_barrier, "barrier=%u"},
{Opt_extents, "extents"},
{Opt_noextents, "noextents"},
+ {Opt_i_version, "i_version"},
+ {Opt_mballoc, "mballoc"},
+ {Opt_nomballoc, "nomballoc"},
+ {Opt_stripe, "stripe=%u"},
{Opt_err, NULL},
{Opt_resize, "resize"},
};
@@ -1035,6 +1116,13 @@ static int parse_options (char *options, struct super_block *sb,
return 0;
*journal_devnum = option;
break;
+ case Opt_journal_checksum:
+ set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
+ break;
+ case Opt_journal_async_commit:
+ set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
+ set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
+ break;
case Opt_noload:
set_opt (sbi->s_mount_opt, NOLOAD);
break;
@@ -1203,6 +1291,23 @@ clear_qf_name:
case Opt_noextents:
clear_opt (sbi->s_mount_opt, EXTENTS);
break;
+ case Opt_i_version:
+ set_opt(sbi->s_mount_opt, I_VERSION);
+ sb->s_flags |= MS_I_VERSION;
+ break;
+ case Opt_mballoc:
+ set_opt(sbi->s_mount_opt, MBALLOC);
+ break;
+ case Opt_nomballoc:
+ clear_opt(sbi->s_mount_opt, MBALLOC);
+ break;
+ case Opt_stripe:
+ if (match_int(&args[0], &option))
+ return 0;
+ if (option < 0)
+ return 0;
+ sbi->s_stripe = option;
+ break;
default:
printk (KERN_ERR
"EXT4-fs: Unrecognized mount option \"%s\" "
@@ -1364,7 +1469,7 @@ static int ext4_check_descriptors (struct super_block * sb)
struct ext4_group_desc * gdp = NULL;
int desc_block = 0;
int flexbg_flag = 0;
- int i;
+ ext4_group_t i;
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
flexbg_flag = 1;
@@ -1386,7 +1491,7 @@ static int ext4_check_descriptors (struct super_block * sb)
if (block_bitmap < first_block || block_bitmap > last_block)
{
ext4_error (sb, "ext4_check_descriptors",
- "Block bitmap for group %d"
+ "Block bitmap for group %lu"
" not in group (block %llu)!",
i, block_bitmap);
return 0;
@@ -1395,7 +1500,7 @@ static int ext4_check_descriptors (struct super_block * sb)
if (inode_bitmap < first_block || inode_bitmap > last_block)
{
ext4_error (sb, "ext4_check_descriptors",
- "Inode bitmap for group %d"
+ "Inode bitmap for group %lu"
" not in group (block %llu)!",
i, inode_bitmap);
return 0;
@@ -1405,17 +1510,16 @@ static int ext4_check_descriptors (struct super_block * sb)
inode_table + sbi->s_itb_per_group - 1 > last_block)
{
ext4_error (sb, "ext4_check_descriptors",
- "Inode table for group %d"
+ "Inode table for group %lu"
" not in group (block %llu)!",
i, inode_table);
return 0;
}
if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
ext4_error(sb, __FUNCTION__,
- "Checksum for group %d failed (%u!=%u)\n", i,
- le16_to_cpu(ext4_group_desc_csum(sbi, i,
- gdp)),
- le16_to_cpu(gdp->bg_checksum));
+ "Checksum for group %lu failed (%u!=%u)\n",
+ i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
+ gdp)), le16_to_cpu(gdp->bg_checksum));
return 0;
}
if (!flexbg_flag)
@@ -1429,7 +1533,6 @@ static int ext4_check_descriptors (struct super_block * sb)
return 1;
}
-
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
* the superblock) which were deleted from all directories, but held open by
* a process at the time of a crash. We walk the list and try to delete these
@@ -1542,20 +1645,95 @@ static void ext4_orphan_cleanup (struct super_block * sb,
#endif
sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
+/*
+ * Maximal extent format file size.
+ * Resulting logical blkno at s_maxbytes must fit in our on-disk
+ * extent format containers, within a sector_t, and within i_blocks
+ * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
+ * so that won't be a limiting factor.
+ *
+ * Note, this does *not* consider any metadata overhead for vfs i_blocks.
+ */
+static loff_t ext4_max_size(int blkbits)
+{
+ loff_t res;
+ loff_t upper_limit = MAX_LFS_FILESIZE;
+
+ /* small i_blocks in vfs inode? */
+ if (sizeof(blkcnt_t) < sizeof(u64)) {
+ /*
+ * CONFIG_LSF is not enabled implies the inode
+ * i_block represent total blocks in 512 bytes
+ * 32 == size of vfs inode i_blocks * 8
+ */
+ upper_limit = (1LL << 32) - 1;
+
+ /* total blocks in file system block size */
+ upper_limit >>= (blkbits - 9);
+ upper_limit <<= blkbits;
+ }
+
+ /* 32-bit extent-start container, ee_block */
+ res = 1LL << 32;
+ res <<= blkbits;
+ res -= 1;
+
+ /* Sanity check against vm- & vfs- imposed limits */
+ if (res > upper_limit)
+ res = upper_limit;
+
+ return res;
+}
/*
- * Maximal file size. There is a direct, and {,double-,triple-}indirect
- * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
- * We need to be 1 filesystem block less than the 2^32 sector limit.
+ * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
+ * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
+ * We need to be 1 filesystem block less than the 2^48 sector limit.
*/
-static loff_t ext4_max_size(int bits)
+static loff_t ext4_max_bitmap_size(int bits)
{
loff_t res = EXT4_NDIR_BLOCKS;
- /* This constant is calculated to be the largest file size for a
- * dense, 4k-blocksize file such that the total number of
+ int meta_blocks;
+ loff_t upper_limit;
+ /* This is calculated to be the largest file size for a
+ * dense, bitmapped file such that the total number of
* sectors in the file, including data and all indirect blocks,
- * does not exceed 2^32. */
- const loff_t upper_limit = 0x1ff7fffd000LL;
+ * does not exceed 2^48 -1
+ * __u32 i_blocks_lo and _u16 i_blocks_high representing the
+ * total number of 512 bytes blocks of the file
+ */
+
+ if (sizeof(blkcnt_t) < sizeof(u64)) {
+ /*
+ * CONFIG_LSF is not enabled implies the inode
+ * i_block represent total blocks in 512 bytes
+ * 32 == size of vfs inode i_blocks * 8
+ */
+ upper_limit = (1LL << 32) - 1;
+
+ /* total blocks in file system block size */
+ upper_limit >>= (bits - 9);
+
+ } else {
+ /*
+ * We use 48 bit ext4_inode i_blocks
+ * With EXT4_HUGE_FILE_FL set the i_blocks
+ * represent total number of blocks in
+ * file system block size
+ */
+ upper_limit = (1LL << 48) - 1;
+
+ }
+
+ /* indirect blocks */
+ meta_blocks = 1;
+ /* double indirect blocks */
+ meta_blocks += 1 + (1LL << (bits-2));
+ /* tripple indirect blocks */
+ meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
+
+ upper_limit -= meta_blocks;
+ upper_limit <<= bits;
res += 1LL << (bits-2);
res += 1LL << (2*(bits-2));
@@ -1563,6 +1741,10 @@ static loff_t ext4_max_size(int bits)
res <<= bits;
if (res > upper_limit)
res = upper_limit;
+
+ if (res > MAX_LFS_FILESIZE)
+ res = MAX_LFS_FILESIZE;
+
return res;
}
@@ -1570,7 +1752,7 @@ static ext4_fsblk_t descriptor_loc(struct super_block *sb,
ext4_fsblk_t logical_sb_block, int nr)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
- unsigned long bg, first_meta_bg;
+ ext4_group_t bg, first_meta_bg;
int has_super = 0;
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
@@ -1584,8 +1766,39 @@ static ext4_fsblk_t descriptor_loc(struct super_block *sb,
return (has_super + ext4_group_first_block_no(sb, bg));
}
+/**
+ * ext4_get_stripe_size: Get the stripe size.
+ * @sbi: In memory super block info
+ *
+ * If we have specified it via mount option, then
+ * use the mount option value. If the value specified at mount time is
+ * greater than the blocks per group use the super block value.
+ * If the super block value is greater than blocks per group return 0.
+ * Allocator needs it be less than blocks per group.
+ *
+ */
+static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
+{
+ unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
+ unsigned long stripe_width =
+ le32_to_cpu(sbi->s_es->s_raid_stripe_width);
+
+ if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
+ return sbi->s_stripe;
+
+ if (stripe_width <= sbi->s_blocks_per_group)
+ return stripe_width;
+
+ if (stride <= sbi->s_blocks_per_group)
+ return stride;
+
+ return 0;
+}
static int ext4_fill_super (struct super_block *sb, void *data, int silent)
+ __releases(kernel_sem)
+ __acquires(kernel_sem)
+
{
struct buffer_head * bh;
struct ext4_super_block *es = NULL;
@@ -1599,7 +1812,6 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
unsigned long def_mount_opts;
struct inode *root;
int blocksize;
- int hblock;
int db_count;
int i;
int needs_recovery;
@@ -1624,6 +1836,11 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
goto out_fail;
}
+ if (!sb_set_blocksize(sb, blocksize)) {
+ printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
+ goto out_fail;
+ }
+
/*
* The ext4 superblock will not be buffer aligned for other than 1kB
* block sizes. We need to calculate the offset from buffer start.
@@ -1674,10 +1891,10 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
- else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
- set_opt(sbi->s_mount_opt, ERRORS_RO);
- else
+ else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
set_opt(sbi->s_mount_opt, ERRORS_CONT);
+ else
+ set_opt(sbi->s_mount_opt, ERRORS_RO);
sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
@@ -1689,6 +1906,11 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
* User -o noextents to turn it off
*/
set_opt(sbi->s_mount_opt, EXTENTS);
+ /*
+ * turn on mballoc feature by default in ext4 filesystem
+ * User -o nomballoc to turn it off
+ */
+ set_opt(sbi->s_mount_opt, MBALLOC);
if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
NULL, 0))
@@ -1723,6 +1945,19 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
sb->s_id, le32_to_cpu(features));
goto failed_mount;
}
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
+ /*
+ * Large file size enabled file system can only be
+ * mount if kernel is build with CONFIG_LSF
+ */
+ if (sizeof(root->i_blocks) < sizeof(u64) &&
+ !(sb->s_flags & MS_RDONLY)) {
+ printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
+ "files cannot be mounted read-write "
+ "without CONFIG_LSF.\n", sb->s_id);
+ goto failed_mount;
+ }
+ }
blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
if (blocksize < EXT4_MIN_BLOCK_SIZE ||
@@ -1733,20 +1968,16 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
goto failed_mount;
}
- hblock = bdev_hardsect_size(sb->s_bdev);
if (sb->s_blocksize != blocksize) {
- /*
- * Make sure the blocksize for the filesystem is larger
- * than the hardware sectorsize for the machine.
- */
- if (blocksize < hblock) {
- printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
- "device blocksize %d.\n", blocksize, hblock);
+
+ /* Validate the filesystem blocksize */
+ if (!sb_set_blocksize(sb, blocksize)) {
+ printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
+ blocksize);
goto failed_mount;
}
brelse (bh);
- sb_set_blocksize(sb, blocksize);
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
offset = do_div(logical_sb_block, blocksize);
bh = sb_bread(sb, logical_sb_block);
@@ -1764,6 +1995,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
}
}
+ sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
@@ -1838,6 +2070,17 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
goto cantfind_ext4;
+
+ /* ensure blocks_count calculation below doesn't sign-extend */
+ if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
+ le32_to_cpu(es->s_first_data_block) + 1) {
+ printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
+ "first data block %u, blocks per group %lu\n",
+ ext4_blocks_count(es),
+ le32_to_cpu(es->s_first_data_block),
+ EXT4_BLOCKS_PER_GROUP(sb));
+ goto failed_mount;
+ }
blocks_count = (ext4_blocks_count(es) -
le32_to_cpu(es->s_first_data_block) +
EXT4_BLOCKS_PER_GROUP(sb) - 1);
@@ -1900,6 +2143,8 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
sbi->s_rsv_window_head.rsv_goal_size = 0;
ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
+ sbi->s_stripe = ext4_get_stripe_size(sbi);
+
/*
* set up enough so that it can read an inode
*/
@@ -1944,6 +2189,21 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
goto failed_mount4;
}
+ if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
+ jbd2_journal_set_features(sbi->s_journal,
+ JBD2_FEATURE_COMPAT_CHECKSUM, 0,
+ JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
+ } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
+ jbd2_journal_set_features(sbi->s_journal,
+ JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
+ jbd2_journal_clear_features(sbi->s_journal, 0, 0,
+ JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
+ } else {
+ jbd2_journal_clear_features(sbi->s_journal,
+ JBD2_FEATURE_COMPAT_CHECKSUM, 0,
+ JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
+ }
+
/* We have now updated the journal if required, so we can
* validate the data journaling mode. */
switch (test_opt(sb, DATA_FLAGS)) {
@@ -2044,6 +2304,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
"writeback");
ext4_ext_init(sb);
+ ext4_mb_init(sb, needs_recovery);
lock_kernel();
return 0;
@@ -2673,7 +2934,7 @@ static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
if (test_opt(sb, MINIX_DF)) {
sbi->s_overhead_last = 0;
} else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
- unsigned long ngroups = sbi->s_groups_count, i;
+ ext4_group_t ngroups = sbi->s_groups_count, i;
ext4_fsblk_t overhead = 0;
smp_rmb();
@@ -2909,7 +3170,7 @@ static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off)
{
struct inode *inode = sb_dqopt(sb)->files[type];
- sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
+ ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
int err = 0;
int offset = off & (sb->s_blocksize - 1);
int tocopy;
@@ -2947,7 +3208,7 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
const char *data, size_t len, loff_t off)
{
struct inode *inode = sb_dqopt(sb)->files[type];
- sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
+ ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
int err = 0;
int offset = off & (sb->s_blocksize - 1);
int tocopy;
@@ -3002,7 +3263,6 @@ out:
i_size_write(inode, off+len-towrite);
EXT4_I(inode)->i_disksize = inode->i_size;
}
- inode->i_version++;
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
ext4_mark_inode_dirty(handle, inode);
mutex_unlock(&inode->i_mutex);
@@ -3027,9 +3287,15 @@ static struct file_system_type ext4dev_fs_type = {
static int __init init_ext4_fs(void)
{
- int err = init_ext4_xattr();
+ int err;
+
+ err = init_ext4_mballoc();
if (err)
return err;
+
+ err = init_ext4_xattr();
+ if (err)
+ goto out2;
err = init_inodecache();
if (err)
goto out1;
@@ -3041,6 +3307,8 @@ out:
destroy_inodecache();
out1:
exit_ext4_xattr();
+out2:
+ exit_ext4_mballoc();
return err;
}
@@ -3049,6 +3317,7 @@ static void __exit exit_ext4_fs(void)
unregister_filesystem(&ext4dev_fs_type);
destroy_inodecache();
exit_ext4_xattr();
+ exit_ext4_mballoc();
}
MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 86387302c2a..d7962139c01 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -480,7 +480,7 @@ ext4_xattr_release_block(handle_t *handle, struct inode *inode,
ea_bdebug(bh, "refcount now=0; freeing");
if (ce)
mb_cache_entry_free(ce);
- ext4_free_blocks(handle, inode, bh->b_blocknr, 1);
+ ext4_free_blocks(handle, inode, bh->b_blocknr, 1, 1);
get_bh(bh);
ext4_forget(handle, 1, inode, bh, bh->b_blocknr);
} else {
@@ -821,7 +821,7 @@ inserted:
new_bh = sb_getblk(sb, block);
if (!new_bh) {
getblk_failed:
- ext4_free_blocks(handle, inode, block, 1);
+ ext4_free_blocks(handle, inode, block, 1, 1);
error = -EIO;
goto cleanup;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-05 18:45:21 +0000