tree dc6601c000fc21c80db3f6861ac117359649429a
parent 8dd2cb7e880d2f77fba53b523c99133ad5054cfd
author Shaohua Li <shli@kernel.org> 1355454951 +0800
committer Jens Axboe <axboe@kernel.dk> 1355514364 +0100

block: add plug for blkdev_issue_discard

Last post of this patch appears lost, so I resend this.

Now discard merge works, add plug for blkdev_issue_discard. This will help
discard request merge especially for raid0 case. In raid0, a big discard
request is split to small requests, and if correct plug is added, such small
requests can be merged in low layer.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>