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authorFelix Blyakher <felixb@sgi.com>2009-05-07 19:49:45 -0500
committerFelix Blyakher <felixb@sgi.com>2009-05-08 00:29:44 -0500
commitec91d1335f478c5cd089d82ffbf936075c5f24c8 (patch)
treea17f277b51ece8ffa9c5dae796372d7140c77a4c /fs/xfs
parent6321e3ed2acf3ee9643cdd403e1c88605d7944ba (diff)
downloadop-kernel-dev-ec91d1335f478c5cd089d82ffbf936075c5f24c8.zip
op-kernel-dev-ec91d1335f478c5cd089d82ffbf936075c5f24c8.tar.gz
xfs: fix double unlock in xfs_swap_extents()
Regreesion from commit ef8f7fc, which rearranged the code in xfs_swap_extents() leading to double unlock of xfs inode ilock. That resulted in xfs_fsr deadlocking itself on platforms, which don't handle double unlock of rw_semaphore nicely. It caused the count go negative, which represents the write holder, without really having one. ia64 is one of the platforms where deadlock was easily reproduced and the fix was tested. Signed-off-by: Eric Sandeen <sandeen@sandeen.net> Reviewed-by: Eric Sandeen <sandeen@sandeen.net> Signed-off-by: Felix Blyakher <felixb@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_dfrag.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c
index e6d839b..7465f9e 100644
--- a/fs/xfs/xfs_dfrag.c
+++ b/fs/xfs/xfs_dfrag.c
@@ -347,13 +347,15 @@ xfs_swap_extents(
error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
-out_unlock:
- xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
- xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
out:
kmem_free(tempifp);
return error;
+out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ goto out;
+
out_trans_cancel:
xfs_trans_cancel(tp, 0);
goto out_unlock;
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