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[XFS] avoid race in sync_inodes() that can fail to write out all dirty data

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In xfs_fs_sync_super() treat a sync the same as a filesystem freeze. This
is needed to force the log to disk for inodes which are not marked dirty
in the Linux inode (the inodes are marked dirty on completion of the log
I/O) and so sync_inodes() will not flush them.

In xfs_fs_write_inode() a synchronous flush will not get an EAGAIN from
xfs_inode_flush() and if an asynchronous flush returns EAGAIN we should
pass it on to the caller. If we get an error while flushing the inode then
re-dirty it so we can try again later.

SGI-PV: 971670
SGI-Modid: xfs-linux-melb:xfs-kern:29860a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
This commit is contained in:
Lachlan McIlroy 2007-10-12 11:13:35 +10:00 committed by Tim Shimmin
parent c2cba57e83
commit e893bffd4c
1 changed files with 20 additions and 9 deletions
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29
fs/xfs/linux-2.6/xfs_super.c
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@ -410,13 +410,12 @@ xfs_fs_write_inode(
flags |= FLUSH_SYNC;
}
error = xfs_inode_flush(XFS_I(inode), flags);
if (error == EAGAIN) {
if (sync)
error = xfs_inode_flush(XFS_I(inode),
flags | FLUSH_LOG);
else
error = 0;
}
/*
* if we failed to write out the inode then mark
* it dirty again so we'll try again later.
*/
if (error)
mark_inode_dirty_sync(inode);
return -error;
}
@ -622,7 +621,19 @@ xfs_fs_sync_super(
int error;
int flags;
if (unlikely(sb->s_frozen == SB_FREEZE_WRITE)) {
/*
* 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.
*/
if (wait || unlikely(sb->s_frozen == SB_FREEZE_WRITE)) {
/*
* First stage of freeze - no more writers will make progress
* now we are here, so we flush delwri and delalloc buffers
@ -633,7 +644,7 @@ xfs_fs_sync_super(
*/
flags = SYNC_DATA_QUIESCE;
} else
flags = SYNC_FSDATA | (wait ? SYNC_WAIT : 0);
flags = SYNC_FSDATA;
error = xfs_sync(mp, flags);
sb->s_dirt = 0;