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Diffstat (limited to 'fs/fat/inode.c')
-rw-r--r--fs/fat/inode.c97
1 files changed, 71 insertions, 26 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 31b7174176b..045738032a8 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -24,6 +24,7 @@
#include <linux/vfs.h>
#include <linux/parser.h>
#include <linux/uio.h>
+#include <linux/writeback.h>
#include <asm/unaligned.h>
#ifndef CONFIG_FAT_DEFAULT_IOCHARSET
@@ -50,14 +51,14 @@ static int fat_add_cluster(struct inode *inode)
return err;
}
-static int __fat_get_blocks(struct inode *inode, sector_t iblock,
- unsigned long *max_blocks,
- struct buffer_head *bh_result, int create)
+static inline int __fat_get_block(struct inode *inode, sector_t iblock,
+ unsigned long *max_blocks,
+ struct buffer_head *bh_result, int create)
{
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- sector_t phys;
unsigned long mapped_blocks;
+ sector_t phys;
int err, offset;
err = fat_bmap(inode, iblock, &phys, &mapped_blocks);
@@ -73,7 +74,7 @@ static int __fat_get_blocks(struct inode *inode, sector_t iblock,
if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) {
fat_fs_panic(sb, "corrupted file size (i_pos %lld, %lld)",
- MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private);
+ MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private);
return -EIO;
}
@@ -93,34 +94,29 @@ static int __fat_get_blocks(struct inode *inode, sector_t iblock,
err = fat_bmap(inode, iblock, &phys, &mapped_blocks);
if (err)
return err;
+
BUG_ON(!phys);
BUG_ON(*max_blocks != mapped_blocks);
set_buffer_new(bh_result);
map_bh(bh_result, sb, phys);
+
return 0;
}
-static int fat_get_blocks(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create)
+static int fat_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
{
struct super_block *sb = inode->i_sb;
- int err;
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
+ int err;
- err = __fat_get_blocks(inode, iblock, &max_blocks, bh_result, create);
+ err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create);
if (err)
return err;
bh_result->b_size = max_blocks << sb->s_blocksize_bits;
return 0;
}
-static int fat_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create)
-{
- unsigned long max_blocks = 1;
- return __fat_get_blocks(inode, iblock, &max_blocks, bh_result, create);
-}
-
static int fat_writepage(struct page *page, struct writeback_control *wbc)
{
return block_write_full_page(page, fat_get_block, wbc);
@@ -188,7 +184,7 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
* condition of fat_get_block() and ->truncate().
*/
return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
- offset, nr_segs, fat_get_blocks, NULL);
+ offset, nr_segs, fat_get_block, NULL);
}
static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
@@ -375,8 +371,6 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
inode->i_flags |= S_IMMUTABLE;
}
MSDOS_I(inode)->i_attrs = de->attr & ATTR_UNUSED;
- /* this is as close to the truth as we can get ... */
- inode->i_blksize = sbi->cluster_size;
inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
& ~((loff_t)sbi->cluster_size - 1)) >> 9;
inode->i_mtime.tv_sec =
@@ -528,8 +522,7 @@ static int __init fat_init_inodecache(void)
static void __exit fat_destroy_inodecache(void)
{
- if (kmem_cache_destroy(fat_inode_cachep))
- printk(KERN_INFO "fat_inode_cache: not all structures were freed\n");
+ kmem_cache_destroy(fat_inode_cachep);
}
static int fat_remount(struct super_block *sb, int *flags, char *data)
@@ -861,7 +854,7 @@ enum {
Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
- Opt_obsolate, Opt_err,
+ Opt_obsolate, Opt_flush, Opt_err,
};
static match_table_t fat_tokens = {
@@ -893,7 +886,8 @@ static match_table_t fat_tokens = {
{Opt_obsolate, "cvf_format=%20s"},
{Opt_obsolate, "cvf_options=%100s"},
{Opt_obsolate, "posix"},
- {Opt_err, NULL}
+ {Opt_flush, "flush"},
+ {Opt_err, NULL},
};
static match_table_t msdos_tokens = {
{Opt_nodots, "nodots"},
@@ -1034,6 +1028,9 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
return 0;
opts->codepage = option;
break;
+ case Opt_flush:
+ opts->flush = 1;
+ break;
/* msdos specific */
case Opt_dots:
@@ -1137,7 +1134,6 @@ static int fat_read_root(struct inode *inode)
MSDOS_I(inode)->i_start = 0;
inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry);
}
- inode->i_blksize = sbi->cluster_size;
inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
& ~((loff_t)sbi->cluster_size - 1)) >> 9;
MSDOS_I(inode)->i_logstart = 0;
@@ -1168,11 +1164,10 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
long error;
char buf[50];
- sbi = kmalloc(sizeof(struct msdos_sb_info), GFP_KERNEL);
+ sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_fs_info = sbi;
- memset(sbi, 0, sizeof(struct msdos_sb_info));
sb->s_flags |= MS_NODIRATIME;
sb->s_magic = MSDOS_SUPER_MAGIC;
@@ -1435,6 +1430,56 @@ out_fail:
EXPORT_SYMBOL_GPL(fat_fill_super);
+/*
+ * helper function for fat_flush_inodes. This writes both the inode
+ * and the file data blocks, waiting for in flight data blocks before
+ * the start of the call. It does not wait for any io started
+ * during the call
+ */
+static int writeback_inode(struct inode *inode)
+{
+
+ int ret;
+ struct address_space *mapping = inode->i_mapping;
+ struct writeback_control wbc = {
+ .sync_mode = WB_SYNC_NONE,
+ .nr_to_write = 0,
+ };
+ /* if we used WB_SYNC_ALL, sync_inode waits for the io for the
+ * inode to finish. So WB_SYNC_NONE is sent down to sync_inode
+ * and filemap_fdatawrite is used for the data blocks
+ */
+ ret = sync_inode(inode, &wbc);
+ if (!ret)
+ ret = filemap_fdatawrite(mapping);
+ return ret;
+}
+
+/*
+ * write data and metadata corresponding to i1 and i2. The io is
+ * started but we do not wait for any of it to finish.
+ *
+ * filemap_flush is used for the block device, so if there is a dirty
+ * page for a block already in flight, we will not wait and start the
+ * io over again
+ */
+int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2)
+{
+ int ret = 0;
+ if (!MSDOS_SB(sb)->options.flush)
+ return 0;
+ if (i1)
+ ret = writeback_inode(i1);
+ if (!ret && i2)
+ ret = writeback_inode(i2);
+ if (!ret && sb) {
+ struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
+ ret = filemap_flush(mapping);
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(fat_flush_inodes);
+
static int __init init_fat_fs(void)
{
int err;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-01-23 04:52:38 +0000