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[PATCH] blk: fix merge bug in as-iosched

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as-iosched deals with aliased requests differently from other ioscheds.

It links together aliased requests using rq->queuelist instead of
spilling alises to dispatch queue like other ioscheds do.  Requests
linked in this way cannot be merged.

Unfortunately, generic q->last_merge handling patch didn't take this
into account and q->last_merge could be set to an aliased request
resulting in Badness, corrupt list and eventually panic.

This explicitly marks aliased requests to be unmergeable.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Tejun Heo 2005-10-29 18:18:42 +09:00 committed by Linus Torvalds
parent fc228a04a4
commit 47e627ce83
1 changed files with 1 additions and 0 deletions
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drivers/block/as-iosched.c
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@ -1344,6 +1344,7 @@ as_add_aliased_request(struct as_data *ad, struct as_rq *arq, struct as_rq *alia
* Don't want to have to handle merges.
*/
as_del_arq_hash(arq);
arq->request->flags |= REQ_NOMERGE;
}
/*