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| author | Nathan Scott <nathans@bruce> | 2006-03-15 15:14:45 +1100 |
|---|---|---|
| committer | Nathan Scott <nathans@bruce> | 2006-03-15 15:14:45 +1100 |
| commit | 3fb962bde48c413bfa419ec4413037e87955dcb6 (patch) | |
| tree | ccce49b3fbdd8a3f38bbfd07a397092a3ae483b5 /kernel/extable.c | |
| parent | 3759fa9c55923f719ae944a3f8fbb029b36f759d (diff) | |
| download | blackbird-op-linux-3fb962bde48c413bfa419ec4413037e87955dcb6.tar.gz blackbird-op-linux-3fb962bde48c413bfa419ec4413037e87955dcb6.zip | |
Fix a direct I/O locking issue revealed by the new mutex code.
Affects only XFS (i.e. DIO_OWN_LOCKING case) - currently it is
not possible to get i_mutex locking correct when using DIO_OWN
direct I/O locking in a filesystem due to indeterminism in the
possible return code/lock/unlock combinations. This can cause
a direct read to attempt a double i_mutex unlock inside XFS.
We're now ensuring __blockdev_direct_IO always exits with the
inode i_mutex (still) held for a direct reader.
Tested with the three different locking modes (via direct block
device access, ext3 and XFS) - both reading and writing; cannot
find any regressions resulting from this change, and it clearly
fixes the mutex_unlock warning originally reported here:
http://marc.theaimsgroup.com/?l=linux-kernel&m=114189068126253&w=2
Signed-off-by: Nathan Scott <nathans@sgi.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/extable.c')
0 files changed, 0 insertions, 0 deletions
