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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
commit 5cee5815d1
7 changed files with 52 additions and 136 deletions
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2
include/linux/fs.h
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@ -1321,7 +1321,7 @@ struct super_block {
struct rw_semaphore s_umount;
struct mutex s_lock;
int s_count;
int s_need_sync_fs;
int s_need_sync;
atomic_t s_active;
#ifdef CONFIG_SECURITY
void *s_security;