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linux-sg2042
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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: prevent merges of discard and write requests
This commit is contained in:
Linus Torvalds 2010-09-25 09:51:54 -07:00
parent e7553b19da f281fb5fe5
commit 56162badad
1 changed files with 12 additions and 0 deletions
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12
block/blk-merge.c
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@ -361,6 +361,18 @@ static int attempt_merge(struct request_queue *q, struct request *req,
if (!rq_mergeable(req) || !rq_mergeable(next))
return 0;
/*
* Don't merge file system requests and discard requests
*/
if ((req->cmd_flags & REQ_DISCARD) != (next->cmd_flags & REQ_DISCARD))
return 0;
/*
* Don't merge discard requests and secure discard requests
*/
if ((req->cmd_flags & REQ_SECURE) != (next->cmd_flags & REQ_SECURE))
return 0;
/*
* not contiguous
*/