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| author | Tejun Heo <htejun@gmail.com> | 2008-02-19 11:36:53 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-02-19 11:36:53 +0100 |
| commit | 2fb98e8414c42cb14698833aac640b143b9ade4f (patch) | |
| tree | ab241305b5ce3ea5ef3e76df7abe04b831cd9e34 /block/blk-merge.c | |
| parent | 6b00769fe1502b4ad97bb327ef7ac971b208bfb5 (diff) | |
| download | lwn-2fb98e8414c42cb14698833aac640b143b9ade4f.tar.gz lwn-2fb98e8414c42cb14698833aac640b143b9ade4f.zip | |
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>
Diffstat (limited to 'block/blk-merge.c')
| -rw-r--r-- | block/blk-merge.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index 39f2e077a014..bef1b4d0fc02 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -220,7 +220,7 @@ new_segment: bvprv = bvec; } /* segments in rq */ - if (q->dma_drain_size) { + if (q->dma_drain_size && q->dma_drain_needed(rq)) { sg->page_link &= ~0x02; sg = sg_next(sg); sg_set_page(sg, virt_to_page(q->dma_drain_buffer), |