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