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authorTejun Heo <htejun@gmail.com>2008-02-19 05:36:53 -0500
committerJens Axboe <jens.axboe@oracle.com>2008-02-19 05:36:53 -0500
commit2fb98e8414c42cb14698833aac640b143b9ade4f (patch)
treeab241305b5ce3ea5ef3e76df7abe04b831cd9e34 /include
parent6b00769fe1502b4ad97bb327ef7ac971b208bfb5 (diff)
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 'include')
-rw-r--r--include/linux/blkdev.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f1fe9fbf1c0e..6fe67d1939c2 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -259,6 +259,7 @@ struct bio_vec;
259typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *); 259typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *);
260typedef void (prepare_flush_fn) (struct request_queue *, struct request *); 260typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
261typedef void (softirq_done_fn)(struct request *); 261typedef void (softirq_done_fn)(struct request *);
262typedef int (dma_drain_needed_fn)(struct request *);
262 263
263enum blk_queue_state { 264enum blk_queue_state {
264 Queue_down, 265 Queue_down,
@@ -295,6 +296,7 @@ struct request_queue
295 merge_bvec_fn *merge_bvec_fn; 296 merge_bvec_fn *merge_bvec_fn;
296 prepare_flush_fn *prepare_flush_fn; 297 prepare_flush_fn *prepare_flush_fn;
297 softirq_done_fn *softirq_done_fn; 298 softirq_done_fn *softirq_done_fn;
299 dma_drain_needed_fn *dma_drain_needed;
298 300
299 /* 301 /*
300 * Dispatch queue sorting 302 * Dispatch queue sorting
@@ -699,8 +701,9 @@ extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short);
699extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 701extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
700extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); 702extern void blk_queue_hardsect_size(struct request_queue *, unsigned short);
701extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); 703extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
702extern int blk_queue_dma_drain(struct request_queue *q, void *buf, 704extern int blk_queue_dma_drain(struct request_queue *q,
703 unsigned int size); 705 dma_drain_needed_fn *dma_drain_needed,
706 void *buf, unsigned int size);
704extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 707extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
705extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); 708extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
706extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); 709extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);