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xfs: I/O completion handlers must use NOFS allocations

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When completing I/O requests we must not allow the memory allocator to
recurse into the filesystem, as we might deadlock on waiting for the
I/O completion otherwise.  The only thing currently allocating normal
GFP_KERNEL memory is the allocation of the transaction structure for
the unwritten extent conversion.  Add a memflags argument to
_xfs_trans_alloc to allow controlling the allocator behaviour.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Thomas Neumann <tneumann@users.sourceforge.net>
Tested-by: Thomas Neumann <tneumann@users.sourceforge.net>
Reviewed-by: Alex Elder <aelder@sgi.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig
2009-10-19 04:00:03 +00:00
committed by Alex Elder
parent c56c9631cb
commit 80641dc66a
5 changed files with 15 additions and 7 deletions
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fs/xfs/xfs_fsops.c
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@@ -611,7 +611,7 @@ xfs_fs_log_dummy(
xfs_inode_t *ip;
int error;
tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
if (error) {
xfs_trans_cancel(tp, 0);