tree ab241305b5ce3ea5ef3e76df7abe04b831cd9e34
parent 6b00769fe1502b4ad97bb327ef7ac971b208bfb5
author Tejun Heo <htejun@gmail.com> 1203417413 +0100
committer Jens Axboe <jens.axboe@oracle.com> 1203417413 +0100

block: implement request_queue->dma_drain_needed

Draining shouldn't be done for commands where overflow may indicate
data integrity issues.  Add dma_drain_needed callback to
request_queue.  Drain buffer is appened iff this function returns
non-zero.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>