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List:       linux-xfs
Subject:    [PATCH 1/5] block: do not try to merge discard requests
From:       Christoph Hellwig <hch () infradead ! org>
Date:       2011-03-31 11:28:51
Message-ID: 20110331112952.144090797 () bombadil ! infradead ! org
[Download RAW message or body]

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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