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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>
This commit is contained in:
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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fs/xfs/linux-2.6/xfs_aops.h
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@@ -19,6 +19,7 @@
#define __XFS_AOPS_H__
extern struct workqueue_struct *xfsdatad_workqueue;
extern struct workqueue_struct *xfsconvertd_workqueue;
extern mempool_t *xfs_ioend_pool;
/*