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blk-mq: fix waiting for reserved tags 

blk_mq_wait_for_tags() is only able to wait for "normal" tags,
not reserved tags. Pass in which one we should attempt to get
a tag for, so that waiting for reserved tags will work.

Reserved tags are used for internal commands, which are usually
serialized. Hence no waiting generally takes place, but we should
ensure that it actually works if users need that functionality.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2014-04-29 20:49:48 -06:00
parent bdcfa3e57c
commit 5810d903fa
3 changed files with 4 additions and 4 deletions
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4
block/blk-mq-tag.c
View File

@ -6,9 +6,9 @@
#include "blk-mq.h"
#include "blk-mq-tag.h"
void blk_mq_wait_for_tags(struct blk_mq_tags *tags)
void blk_mq_wait_for_tags(struct blk_mq_tags *tags, bool reserved)
{
int tag = blk_mq_get_tag(tags, __GFP_WAIT, false);
int tag = blk_mq_get_tag(tags, __GFP_WAIT, reserved);
blk_mq_put_tag(tags, tag);
}

2
block/blk-mq-tag.h
View File

@ -24,7 +24,7 @@ extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int r
extern void blk_mq_free_tags(struct blk_mq_tags *tags);
extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, gfp_t gfp, bool reserved);
extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags);
extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags, bool reserved);
extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag);
extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);

2
block/blk-mq.c
View File

@ -218,7 +218,7 @@ static struct request *blk_mq_alloc_request_pinned(struct request_queue *q,
break;
}
blk_mq_wait_for_tags(hctx->tags);
blk_mq_wait_for_tags(hctx->tags, reserved);
} while (1);
return rq;