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xfs: prevent against ioend livelocks in xfs_file_fsync 

We need to take some locks to prevent new ioends from coming in when we wait
for all existing ones to go away.  Up to Linux 3.0 that was done using the
i_mutex held by the VFS fsync code, but now that we are called without
it we need to take care of it ourselves.  Use the I/O lock instead of
i_mutex just like we do in other places.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-07-26 15:07:11 +00:00 committed by Alex Elder
parent 34951f5cb7
commit d1166ec792
1 changed files with 2 additions and 0 deletions
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2
fs/xfs/linux-2.6/xfs_file.c
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@ -149,7 +149,9 @@ xfs_file_fsync(
xfs_iflags_clear(ip, XFS_ITRUNCATED);
xfs_ilock(ip, XFS_IOLOCK_SHARED);
xfs_ioend_wait(ip);
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
if (mp->m_flags & XFS_MOUNT_BARRIER) {
/*