Hack to not make the kernel crash when submitting multiple discard
requests that the blocl layer otherwise tries to merge.
Index: xfs/block/blk-core.c
===================================================================
--- xfs.orig/block/blk-core.c 2011-03-30 16:04:45.700659775 +0200
+++ xfs/block/blk-core.c 2011-03-30 16:04:59.775160021 +0200
@@ -1247,7 +1247,7 @@ static int __make_request(struct request
*/
blk_queue_bounce(q, &bio);
- if (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) {
+ if (bio->bi_rw & (REQ_FLUSH | REQ_FUA | REQ_DISCARD)) {
spin_lock_irq(q->queue_lock);
where = ELEVATOR_INSERT_FLUSH;
goto get_rq;
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