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xfs: cleanup ->sync_fs 

Sort out ->sync_fs to not perform a superblock writeback for the wait = 0 case
as that is just an optional first pass and the superblock will be written back
properly in the next call with wait = 1.  Instead perform an opportunistic
quota writeback to have less work later.  Also remove the freeze special case
as we do a proper wait = 1 call in the freeze code anyway.

Also rename the function to xfs_fs_sync_fs to match the normal naming
convention, update comments and avoid calling into the laptop_mode logic on
an error.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2009-10-06 20:29:28 +00:00 committed by Alex Elder
parent c90b07e8dd
commit 69961a26b8
1 changed files with 18 additions and 18 deletions
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36
fs/xfs/linux-2.6/xfs_super.c
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@ -1148,7 +1148,7 @@ xfs_fs_put_super(
}
STATIC int
xfs_fs_sync_super(
xfs_fs_sync_fs(
struct super_block *sb,
int wait)
{
@ -1156,23 +1156,23 @@ xfs_fs_sync_super(
int error;
/*
* Treat a sync operation like a freeze. This is to work
* around a race in sync_inodes() which works in two phases
* - an asynchronous flush, which can write out an inode
* without waiting for file size updates to complete, and a
* synchronous flush, which wont do anything because the
* async flush removed the inode's dirty flag. Also
* sync_inodes() will not see any files that just have
* outstanding transactions to be flushed because we don't
* dirty the Linux inode until after the transaction I/O
* completes.
* Not much we can do for the first async pass. Writing out the
* superblock would be counter-productive as we are going to redirty
* when writing out other data and metadata (and writing out a single
* block is quite fast anyway).
*
* Try to asynchronously kick off quota syncing at least.
*/
if (wait || unlikely(sb->s_frozen == SB_FREEZE_WRITE))
error = xfs_quiesce_data(mp);
else
error = xfs_sync_fsdata(mp, 0);
if (!wait) {
xfs_qm_sync(mp, SYNC_TRYLOCK);
return 0;
}
if (unlikely(laptop_mode)) {
error = xfs_quiesce_data(mp);
if (error)
return -error;
if (laptop_mode) {
int prev_sync_seq = mp->m_sync_seq;
/*
@ -1191,7 +1191,7 @@ xfs_fs_sync_super(
mp->m_sync_seq != prev_sync_seq);
}
return -error;
return 0;
}
STATIC int
@ -1565,7 +1565,7 @@ static struct super_operations xfs_super_operations = {
.write_inode = xfs_fs_write_inode,
.clear_inode = xfs_fs_clear_inode,
.put_super = xfs_fs_put_super,
.sync_fs = xfs_fs_sync_super,
.sync_fs = xfs_fs_sync_fs,
.freeze_fs = xfs_fs_freeze,
.statfs = xfs_fs_statfs,
.remount_fs = xfs_fs_remount,