xfs: prevent recursion in xfs_buf_iorequest

If the b_iodone handler is run in calling context in xfs_buf_iorequest we
can run into a recursion where xfs_buf_iodone_callbacks keeps calling back
into xfs_buf_iorequest because an I/O error happened, which keeps calling
back into xfs_buf_iorequest.  This chain will usually not take long
because the filesystem gets shut down because of log I/O errors, but even
over a short time it can cause stack overflows if run on the same context.

As a short term workaround make sure we always call the iodone handler in
workqueue context.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2012-07-02 06:00:04 -04:00 committed by Ben Myers
parent aa292847b9
commit 40a9b7963d
1 changed files with 1 additions and 1 deletions

View File

@ -1243,7 +1243,7 @@ xfs_buf_iorequest(
*/
atomic_set(&bp->b_io_remaining, 1);
_xfs_buf_ioapply(bp);
_xfs_buf_ioend(bp, 0);
_xfs_buf_ioend(bp, 1);
xfs_buf_rele(bp);
}