tree 44691c88d767418a57797e84253a4633825c0c98
parent 6f5d8aa6382eef2b26032c88656270bdae7f0c42
author Vasily Averin <vvs@sw.ru> 1193816004 +0100
committer Jens Axboe <axboe@carl.home.kernel.dk> 1193989645 +0100

dm: bounce_pfn limit added

Device mapper uses its own bounce_pfn that may differ from one on underlying
device. In that way dm can build incorrect requests that contain sg elements
greater than underlying device is able to handle.

This is the cause of slab corruption in i2o layer, occurred on i386 arch when
very long direct IO requests are addressed to dm-over-i2o device.

Signed-off-by: Vasily Averin <vvs@sw.ru>
Cc: <stable@kernel.org>
Cc: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>