xfs: prevent unwritten extent conversion from blocking I/O completion

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Unwritten extent conversion can recurse back into the filesystem due
to memory allocation. Memory reclaim requires I/O completions to be
processed to allow the callers to make progress. If the I/O
completion workqueue thread is doing the recursion, then we have a
deadlock situation.

Move unwritten extent completion into it's own workqueue so it
doesn't block I/O completions for normal delayed allocation or
overwrite data.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

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Dave Chinner 2009-04-06 18:42:11 +02:00 • committed by Christoph Hellwig

parent 705db3fd46

commit c626d174cf

3 changed files with 31 additions and 17 deletions

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38

fs/xfs/linux-2.6/xfs_aops.c

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1

fs/xfs/linux-2.6/xfs_aops.h

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9

fs/xfs/linux-2.6/xfs_buf.c

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