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authorTejun Heo <htejun@gmail.com>2008-02-19 11:36:53 +0100
committerJens Axboe <jens.axboe@oracle.com>2008-02-19 11:36:53 +0100
commit2fb98e8414c42cb14698833aac640b143b9ade4f (patch)
treeab241305b5ce3ea5ef3e76df7abe04b831cd9e34 /block/blk-merge.c
parent6b00769fe1502b4ad97bb327ef7ac971b208bfb5 (diff)
downloadop-kernel-dev-2fb98e8414c42cb14698833aac640b143b9ade4f.zip
op-kernel-dev-2fb98e8414c42cb14698833aac640b143b9ade4f.tar.gz
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.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 39f2e07..bef1b4d 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),
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