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block: clear drain buffer if draining for write command
author
Tejun Heo
<htejun@gmail.com>
Tue, 19 Feb 2008 10:36:55 +0000
(11:36 +0100)
committer
Jens Axboe
<jens.axboe@oracle.com>
Tue, 19 Feb 2008 10:36:55 +0000
(11:36 +0100)
Clear drain buffer before chaining if the command in question is a
write.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
block/blk-merge.c
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diff --git
a/block/blk-merge.c
b/block/blk-merge.c
index
bef1b4d
..
7506c4f
100644
(file)
--- a/
block/blk-merge.c
+++ b/
block/blk-merge.c
@@
-221,6
+221,9
@@
new_segment:
} /* segments in rq */
if (q->dma_drain_size && q->dma_drain_needed(rq)) {
+ if (rq->cmd_flags & REQ_RW)
+ memset(q->dma_drain_buffer, 0, q->dma_drain_size);
+
sg->page_link &= ~0x02;
sg = sg_next(sg);
sg_set_page(sg, virt_to_page(q->dma_drain_buffer),