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block: implement request_queue->dma_drain_needed

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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>
This commit is contained in:
Tejun Heo
2008-02-19 11:36:53 +01:00
committed by Jens Axboe
parent 6b00769fe1
commit 2fb98e8414
3 changed files with 11 additions and 5 deletions
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block/blk-merge.c
+1 -1
View File
@@ -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),
block/blk-settings.c
+5 -2
View File
@@ -296,6 +296,7 @@ EXPORT_SYMBOL(blk_queue_stack_limits);
* blk_queue_dma_drain - Set up a drain buffer for excess dma.
*
* @q: the request queue for the device
* @dma_drain_needed: fn which returns non-zero if drain is necessary
* @buf: physically contiguous buffer
* @size: size of the buffer in bytes
*
@@ -315,14 +316,16 @@ EXPORT_SYMBOL(blk_queue_stack_limits);
* device can support otherwise there won't be room for the drain
* buffer.
*/
int blk_queue_dma_drain(struct request_queue *q, void *buf,
unsigned int size)
extern int blk_queue_dma_drain(struct request_queue *q,
dma_drain_needed_fn *dma_drain_needed,
void *buf, unsigned int size)
{
if (q->max_hw_segments < 2 || q->max_phys_segments < 2)
return -EINVAL;
/* make room for appending the drain */
--q->max_hw_segments;
--q->max_phys_segments;
q->dma_drain_needed = dma_drain_needed;
q->dma_drain_buffer = buf;
q->dma_drain_size = size;