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-rw-r--r--fs/btrfs/btrfs_inode.h8
-rw-r--r--fs/btrfs/ctree.h17
-rw-r--r--fs/btrfs/extent-tree.c132
-rw-r--r--fs/btrfs/inode.c43
-rw-r--r--fs/btrfs/ioctl.c2
-rw-r--r--fs/btrfs/transaction.c2
-rw-r--r--fs/btrfs/transaction.h2
7 files changed, 88 insertions, 118 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 1b9ec1ab1f6..a8c9693b75a 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -28,11 +28,6 @@ struct btrfs_inode {
/* which subvolume this inode belongs to */
struct btrfs_root *root;
- /* the block group preferred for allocations. This pointer is buggy
- * and needs to be replaced with a bytenr instead
- */
- struct btrfs_block_group_cache *block_group;
-
/* key used to find this inode on disk. This is used by the code
* to read in roots of subvolumes
*/
@@ -115,6 +110,9 @@ struct btrfs_inode {
*/
u64 index_cnt;
+ /* the start of block group preferred for allocations. */
+ u64 block_group;
+
struct inode vfs_inode;
};
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 5b0c79d22c0..8733081d97a 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -653,6 +653,9 @@ struct btrfs_block_group_cache {
/* for block groups in the same raid type */
struct list_head list;
+
+ /* usage count */
+ atomic_t count;
};
struct btrfs_leaf_ref_tree {
@@ -1706,10 +1709,8 @@ int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
btrfs_fs_info *info,
u64 bytenr);
-struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
- struct btrfs_block_group_cache
- *hint, u64 search_start,
- int data, int owner);
+u64 btrfs_find_block_group(struct btrfs_root *root,
+ u64 search_start, u64 search_hint, int owner);
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u32 blocksize, u64 parent,
@@ -1770,6 +1771,7 @@ int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
u64 owner_objectid);
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
+int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
int btrfs_free_block_groups(struct btrfs_fs_info *info);
int btrfs_read_block_groups(struct btrfs_root *root);
int btrfs_make_block_group(struct btrfs_trans_handle *trans,
@@ -2019,10 +2021,9 @@ int btrfs_start_delalloc_inodes(struct btrfs_root *root);
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
int btrfs_writepages(struct address_space *mapping,
struct writeback_control *wbc);
-int btrfs_create_subvol_root(struct btrfs_root *new_root, struct dentry *dentry,
- struct btrfs_trans_handle *trans, u64 new_dirid,
- struct btrfs_block_group_cache *block_group);
-
+int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *new_root, struct dentry *dentry,
+ u64 new_dirid, u64 alloc_hint);
int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
size_t size, struct bio *bio, unsigned long bio_flags);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 673ff59c288..1cc89246ee2 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -53,10 +53,6 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root, int all);
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root, int all);
-static struct btrfs_block_group_cache *
-__btrfs_find_block_group(struct btrfs_root *root,
- struct btrfs_block_group_cache *hint,
- u64 search_start, int data, int owner);
static int pin_down_bytes(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, int is_data);
@@ -142,6 +138,8 @@ block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr,
break;
}
}
+ if (ret)
+ atomic_inc(&ret->count);
spin_unlock(&info->block_group_cache_lock);
return ret;
@@ -318,6 +316,12 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
return cache;
}
+static inline void put_block_group(struct btrfs_block_group_cache *cache)
+{
+ if (atomic_dec_and_test(&cache->count))
+ kfree(cache);
+}
+
static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
u64 flags)
{
@@ -341,54 +345,16 @@ static u64 div_factor(u64 num, int factor)
return num;
}
-static struct btrfs_block_group_cache *
-__btrfs_find_block_group(struct btrfs_root *root,
- struct btrfs_block_group_cache *hint,
- u64 search_start, int data, int owner)
+u64 btrfs_find_block_group(struct btrfs_root *root,
+ u64 search_start, u64 search_hint, int owner)
{
struct btrfs_block_group_cache *cache;
- struct btrfs_block_group_cache *found_group = NULL;
- struct btrfs_fs_info *info = root->fs_info;
u64 used;
- u64 last = 0;
- u64 free_check;
+ u64 last = max(search_hint, search_start);
+ u64 group_start = 0;
int full_search = 0;
- int factor = 10;
+ int factor = 9;
int wrapped = 0;
-
- if (data & BTRFS_BLOCK_GROUP_METADATA)
- factor = 9;
-
- if (search_start) {
- struct btrfs_block_group_cache *shint;
- shint = btrfs_lookup_first_block_group(info, search_start);
- if (shint && block_group_bits(shint, data)) {
- spin_lock(&shint->lock);
- used = btrfs_block_group_used(&shint->item);
- if (used + shint->pinned + shint->reserved <
- div_factor(shint->key.offset, factor)) {
- spin_unlock(&shint->lock);
- return shint;
- }
- spin_unlock(&shint->lock);
- }
- }
- if (hint && block_group_bits(hint, data)) {
- spin_lock(&hint->lock);
- used = btrfs_block_group_used(&hint->item);
- if (used + hint->pinned + hint->reserved <
- div_factor(hint->key.offset, factor)) {
- spin_unlock(&hint->lock);
- return hint;
- }
- spin_unlock(&hint->lock);
- last = hint->key.objectid + hint->key.offset;
- } else {
- if (hint)
- last = max(hint->key.objectid, search_start);
- else
- last = search_start;
- }
again:
while (1) {
cache = btrfs_lookup_first_block_group(root->fs_info, last);
@@ -399,16 +365,18 @@ again:
last = cache->key.objectid + cache->key.offset;
used = btrfs_block_group_used(&cache->item);
- if (block_group_bits(cache, data)) {
- free_check = div_factor(cache->key.offset, factor);
+ if ((full_search || !cache->ro) &&
+ block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) {
if (used + cache->pinned + cache->reserved <
- free_check) {
- found_group = cache;
+ div_factor(cache->key.offset, factor)) {
+ group_start = cache->key.objectid;
spin_unlock(&cache->lock);
+ put_block_group(cache);
goto found;
}
}
spin_unlock(&cache->lock);
+ put_block_group(cache);
cond_resched();
}
if (!wrapped) {
@@ -423,18 +391,7 @@ again:
goto again;
}
found:
- return found_group;
-}
-
-struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
- struct btrfs_block_group_cache
- *hint, u64 search_start,
- int data, int owner)
-{
-
- struct btrfs_block_group_cache *ret;
- ret = __btrfs_find_block_group(root, hint, search_start, data, owner);
- return ret;
+ return group_start;
}
/* simple helper to search for an existing extent at a given offset */
@@ -1809,6 +1766,19 @@ int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
return werr;
}
+int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr)
+{
+ struct btrfs_block_group_cache *block_group;
+ int readonly = 0;
+
+ block_group = btrfs_lookup_block_group(root->fs_info, bytenr);
+ if (!block_group || block_group->ro)
+ readonly = 1;
+ if (block_group)
+ put_block_group(block_group);
+ return readonly;
+}
+
static int update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
struct btrfs_space_info **space_info)
@@ -1995,10 +1965,10 @@ static int update_block_group(struct btrfs_trans_handle *trans,
int ret;
ret = btrfs_add_free_space(cache, bytenr,
num_bytes);
- if (ret)
- return -1;
+ WARN_ON(ret);
}
}
+ put_block_group(cache);
total -= num_bytes;
bytenr += num_bytes;
}
@@ -2008,12 +1978,16 @@ static int update_block_group(struct btrfs_trans_handle *trans,
static u64 first_logical_byte(struct btrfs_root *root, u64 search_start)
{
struct btrfs_block_group_cache *cache;
+ u64 bytenr;
cache = btrfs_lookup_first_block_group(root->fs_info, search_start);
if (!cache)
return 0;
- return cache->key.objectid;
+ bytenr = cache->key.objectid;
+ put_block_group(cache);
+
+ return bytenr;
}
int btrfs_update_pinned_extents(struct btrfs_root *root,
@@ -2055,6 +2029,7 @@ int btrfs_update_pinned_extents(struct btrfs_root *root,
if (cache->cached)
btrfs_add_free_space(cache, bytenr, len);
}
+ put_block_group(cache);
bytenr += len;
num -= len;
}
@@ -2085,6 +2060,7 @@ static int update_reserved_extents(struct btrfs_root *root,
}
spin_unlock(&cache->lock);
spin_unlock(&cache->space_info->lock);
+ put_block_group(cache);
bytenr += len;
num -= len;
}
@@ -2724,6 +2700,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
cache = btrfs_lookup_block_group(root->fs_info, bytenr);
BUG_ON(!cache);
btrfs_add_free_space(cache, bytenr, num_bytes);
+ put_block_group(cache);
update_reserved_extents(root, bytenr, num_bytes, 0);
return 0;
}
@@ -2928,6 +2905,8 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
}
new_group:
mutex_unlock(&block_group->alloc_mutex);
+ put_block_group(block_group);
+ block_group = NULL;
new_group_no_lock:
/* don't try to compare new allocations against the
* last allocation any more
@@ -2997,6 +2976,8 @@ loop_check:
block_group = list_entry(cur, struct btrfs_block_group_cache,
list);
+ atomic_inc(&block_group->count);
+
search_start = block_group->key.objectid;
cur = cur->next;
}
@@ -3004,7 +2985,7 @@ loop_check:
/* we found what we needed */
if (ins->objectid) {
if (!(data & BTRFS_BLOCK_GROUP_DATA))
- trans->block_group = block_group;
+ trans->block_group = block_group->key.objectid;
if (last_ptr)
*last_ptr = ins->objectid + ins->offset;
@@ -3015,6 +2996,8 @@ loop_check:
loop, allowed_chunk_alloc);
ret = -ENOSPC;
}
+ if (block_group)
+ put_block_group(block_group);
up_read(&space_info->groups_sem);
return ret;
@@ -3124,6 +3107,7 @@ int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len)
return -ENOSPC;
}
btrfs_add_free_space(cache, start, len);
+ put_block_group(cache);
update_reserved_extents(root, start, len, 0);
return 0;
}
@@ -3288,6 +3272,7 @@ int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans,
ret = btrfs_remove_free_space(block_group, ins->objectid,
ins->offset);
BUG_ON(ret);
+ put_block_group(block_group);
ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid,
ref_generation, owner, ins);
return ret;
@@ -5703,6 +5688,7 @@ next:
WARN_ON(block_group->reserved > 0);
WARN_ON(btrfs_block_group_used(&block_group->item) > 0);
spin_unlock(&block_group->lock);
+ put_block_group(block_group);
ret = 0;
out:
btrfs_free_path(path);
@@ -5763,6 +5749,8 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
down_write(&block_group->space_info->groups_sem);
list_del(&block_group->list);
up_write(&block_group->space_info->groups_sem);
+
+ WARN_ON(atomic_read(&block_group->count) != 1);
kfree(block_group);
spin_lock(&info->block_group_cache_lock);
@@ -5807,6 +5795,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
break;
}
+ atomic_set(&cache->count, 1);
spin_lock_init(&cache->lock);
mutex_init(&cache->alloc_mutex);
mutex_init(&cache->cache_mutex);
@@ -5861,11 +5850,12 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
cache->key.objectid = chunk_offset;
cache->key.offset = size;
+ cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
+ atomic_set(&cache->count, 1);
spin_lock_init(&cache->lock);
mutex_init(&cache->alloc_mutex);
mutex_init(&cache->cache_mutex);
INIT_LIST_HEAD(&cache->list);
- btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
btrfs_set_block_group_used(&cache->item, bytes_used);
btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
@@ -5926,10 +5916,8 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
spin_unlock(&block_group->space_info->lock);
block_group->space_info->full = 0;
- /*
- memset(shrink_block_group, 0, sizeof(*shrink_block_group));
- kfree(shrink_block_group);
- */
+ put_block_group(block_group);
+ put_block_group(block_group);
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 932d8c0b2c0..0a28b770631 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -989,7 +989,6 @@ next_slot:
if (extent_type == BTRFS_FILE_EXTENT_REG ||
extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
- struct btrfs_block_group_cache *block_group;
disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
extent_end = found_key.offset +
btrfs_file_extent_num_bytes(leaf, fi);
@@ -1007,9 +1006,7 @@ next_slot:
goto out_check;
if (btrfs_cross_ref_exist(trans, root, disk_bytenr))
goto out_check;
- block_group = btrfs_lookup_block_group(root->fs_info,
- disk_bytenr);
- if (!block_group || block_group->ro)
+ if (btrfs_extent_readonly(root, disk_bytenr))
goto out_check;
disk_bytenr += btrfs_file_extent_offset(leaf, fi);
nocow = 1;
@@ -1969,16 +1966,11 @@ void btrfs_read_locked_inode(struct inode *inode)
rdev = btrfs_inode_rdev(leaf, inode_item);
BTRFS_I(inode)->index_cnt = (u64)-1;
+ BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
- BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
- alloc_group_block);
- BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
- if (!BTRFS_I(inode)->block_group) {
- BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
- NULL, 0,
- BTRFS_BLOCK_GROUP_METADATA, 0);
- }
+ BTRFS_I(inode)->block_group = btrfs_find_block_group(root, 0,
+ alloc_group_block, 0);
btrfs_free_path(path);
inode_item = NULL;
@@ -2048,8 +2040,7 @@ static void fill_inode_item(struct btrfs_trans_handle *trans,
btrfs_set_inode_transid(leaf, item, trans->transid);
btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
- btrfs_set_inode_block_group(leaf, item,
- BTRFS_I(inode)->block_group->key.objectid);
+ btrfs_set_inode_block_group(leaf, item, BTRFS_I(inode)->block_group);
}
/*
@@ -3358,14 +3349,11 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct inode *dir,
const char *name, int name_len,
- u64 ref_objectid,
- u64 objectid,
- struct btrfs_block_group_cache *group,
- int mode, u64 *index)
+ u64 ref_objectid, u64 objectid,
+ u64 alloc_hint, int mode, u64 *index)
{
struct inode *inode;
struct btrfs_inode_item *inode_item;
- struct btrfs_block_group_cache *new_inode_group;
struct btrfs_key *location;
struct btrfs_path *path;
struct btrfs_inode_ref *ref;
@@ -3401,13 +3389,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
owner = 0;
else
owner = 1;
- new_inode_group = btrfs_find_block_group(root, group, 0,
- BTRFS_BLOCK_GROUP_METADATA, owner);
- if (!new_inode_group) {
- printk("find_block group failed\n");
- new_inode_group = group;
- }
- BTRFS_I(inode)->block_group = new_inode_group;
+ BTRFS_I(inode)->block_group =
+ btrfs_find_block_group(root, 0, alloc_hint, owner);
key[0].objectid = objectid;
btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
@@ -4366,16 +4349,16 @@ out:
/*
* create a new subvolume directory/inode (helper for the ioctl).
*/
-int btrfs_create_subvol_root(struct btrfs_root *new_root, struct dentry *dentry,
- struct btrfs_trans_handle *trans, u64 new_dirid,
- struct btrfs_block_group_cache *block_group)
+int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *new_root, struct dentry *dentry,
+ u64 new_dirid, u64 alloc_hint)
{
struct inode *inode;
int error;
u64 index = 0;
inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid,
- new_dirid, block_group, S_IFDIR | 0700, &index);
+ new_dirid, alloc_hint, S_IFDIR | 0700, &index);
if (IS_ERR(inode))
return PTR_ERR(inode);
inode->i_op = &btrfs_dir_inode_operations;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 69c4a07f586..5d67858ce99 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -173,7 +173,7 @@ static noinline int create_subvol(struct btrfs_root *root,
trans = btrfs_start_transaction(new_root, 1);
BUG_ON(!trans);
- ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid,
+ ret = btrfs_create_subvol_root(trans, new_root, dentry, new_dirid,
BTRFS_I(dir)->block_group);
if (ret)
goto fail;
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 47cd5fcad2c..4604178a43a 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -182,7 +182,7 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
h->transaction = root->fs_info->running_transaction;
h->blocks_reserved = num_blocks;
h->blocks_used = 0;
- h->block_group = NULL;
+ h->block_group = 0;
h->alloc_exclude_nr = 0;
h->alloc_exclude_start = 0;
root->fs_info->running_transaction->use_count++;
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 202c8be6c05..ffe7f639732 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -41,7 +41,7 @@ struct btrfs_trans_handle {
unsigned long blocks_reserved;
unsigned long blocks_used;
struct btrfs_transaction *transaction;
- struct btrfs_block_group_cache *block_group;
+ u64 block_group;
u64 alloc_exclude_start;
u64 alloc_exclude_nr;
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-19 01:39:05 +0000