tree b264a9cbd3a36016d312484dcad38f778122af49
parent 9e495db1a1f931e82c9edccd677dd171be5b85d2
author Tao Ma <tao.ma@oracle.com> 1277336637 +0800
committer Jens Axboe <jaxboe@fusionio.com> 1277360062 +0200

block: Don't count_vm_events for discard bio in submit_bio.

In submit_bio, we count vm events by check READ/WRITE.
But actually DISCARD_NOBARRIER also has the WRITE flag set.
It looks as if in blkdev_issue_discard, we also add a
page as the payload and the bio_has_data check isn't enough.
So add another check for discard bio.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>