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Subject[patch v2 2/6] blk: dont allow discard request merge temporarily
Didn't allow discard request merge temporarily, as SCSI layer isn't ready
for discard merge as Martin Petersen pointed out. This isn't fair for
non-scsi device, but looks this is the only way I can do currently.

We should have the same issue before, but maybe because discard merge is
very rare case. But now raid0/10 makes the merge quite possible, so we need
disable it explicitly.

Signed-off-by: Shaohua Li <shli@fusionio.com>
---
include/linux/blkdev.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/include/linux/blkdev.h
===================================================================
--- linux.orig/include/linux/blkdev.h 2012-03-14 09:20:06.787261188 +0800
+++ linux/include/linux/blkdev.h 2012-03-14 09:20:47.797261248 +0800
@@ -575,7 +575,7 @@ static inline void blk_clear_queue_full(
* it already be started by driver.
*/
#define RQ_NOMERGE_FLAGS \
- (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA)
+ (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA | REQ_DISCARD)
#define rq_mergeable(rq) \
(!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \
(((rq)->cmd_flags & REQ_DISCARD) || \


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