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Diffstat (limited to 'block/blk-tag.c')
-rw-r--r--block/blk-tag.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/block/blk-tag.c b/block/blk-tag.c
index c260f7c30dda..2e5cfeb59333 100644
--- a/block/blk-tag.c
+++ b/block/blk-tag.c
@@ -336,7 +336,7 @@ EXPORT_SYMBOL(blk_queue_end_tag);
int blk_queue_start_tag(struct request_queue *q, struct request *rq)
{
struct blk_queue_tag *bqt = q->queue_tags;
- unsigned max_depth, offset;
+ unsigned max_depth;
int tag;
if (unlikely((rq->cmd_flags & REQ_QUEUED))) {
@@ -355,13 +355,16 @@ int blk_queue_start_tag(struct request_queue *q, struct request *rq)
* to starve sync IO on behalf of flooding async IO.
*/
max_depth = bqt->max_depth;
- if (rq_is_sync(rq))
- offset = 0;
- else
- offset = max_depth >> 2;
+ if (!rq_is_sync(rq) && max_depth > 1) {
+ max_depth -= 2;
+ if (!max_depth)
+ max_depth = 1;
+ if (q->in_flight[0] > max_depth)
+ return 1;
+ }
do {
- tag = find_next_zero_bit(bqt->tag_map, max_depth, offset);
+ tag = find_first_zero_bit(bqt->tag_map, max_depth);
if (tag >= max_depth)
return 1;