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vfs: Make sys_sync() use fsync_super() (version 4)

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It is unnecessarily fragile to have two places (fsync_super() and do_sync())
doing data integrity sync of the filesystem. Alter __fsync_super() to
accommodate needs of both callers and use it. So after this patch
__fsync_super() is the only place where we gather all the calls needed to
properly send all data on a filesystem to disk.

Nice bonus is that we get a complete livelock avoidance and write_supers()
is now only used for periodic writeback of superblocks.

sync_blockdevs() introduced a couple of patches ago is gone now.

[build fixes folded]

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jan Kara
2009-04-27 16:43:51 +02:00
committed by Al Viro
parent 429479f031
commit 5cee5815d1
7 changed files with 52 additions and 136 deletions
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16
fs/internal.h
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@ -25,6 +25,8 @@ static inline int sb_is_blkdev_sb(struct super_block *sb)
return sb == blockdev_superblock;
}
extern int __sync_blockdev(struct block_device *bdev, int wait);
#else
static inline void bdev_cache_init(void)
{
@ -34,6 +36,11 @@ static inline int sb_is_blkdev_sb(struct super_block *sb)
{
return 0;
}
static inline int __sync_blockdev(struct block_device *bdev, int wait)
{
return 0;
}
#endif
/*
@ -71,12 +78,3 @@ extern void chroot_fs_refs(struct path *, struct path *);
* file_table.c
*/
extern void mark_files_ro(struct super_block *);
/*
* super.c
*/
#ifdef CONFIG_BLOCK
extern void sync_blockdevs(void);
#else
static inline void sync_blockdevs(void) { }
#endif