From: Tejun Heo <htejun@gmail.com>
Date: Sat, 29 Oct 2005 09:18:42 +0000 (+0900)
Subject: [PATCH] blk: fix merge bug in as-iosched
X-Git-Tag: v2.6.15-rc1~731^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=47e627ce83b6df9f4bb8e4b0a4dde1c5d7a4c929;p=pandora-kernel.git

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

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>
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