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| author | Christoph Hellwig <hch@lst.de> | 2014-04-15 14:14:00 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-04-15 14:18:02 -0600 |
| commit | 24d2f90309b23f2cfe016b2aebc5f0d6e01c57fd (patch) | |
| tree | 10307829129eb8f96facbb89fefbba3c0032fb46 /block/blk-mq-tag.h | |
| parent | ed44832dea8a74f909e0187f350201402927f5e5 (diff) | |
| download | linux-stable-24d2f90309b23f2cfe016b2aebc5f0d6e01c57fd.tar.gz linux-stable-24d2f90309b23f2cfe016b2aebc5f0d6e01c57fd.tar.bz2 linux-stable-24d2f90309b23f2cfe016b2aebc5f0d6e01c57fd.zip | |
blk-mq: split out tag initialization, support shared tags
Add a new blk_mq_tag_set structure that gets set up before we initialize
the queue. A single blk_mq_tag_set structure can be shared by multiple
queues.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Modular export of blk_mq_{alloc,free}_tagset added by me.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq-tag.h')
| -rw-r--r-- | block/blk-mq-tag.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h index 947ba2c6148e..b602e3fa66ea 100644 --- a/block/blk-mq-tag.h +++ b/block/blk-mq-tag.h @@ -1,7 +1,24 @@ #ifndef INT_BLK_MQ_TAG_H #define INT_BLK_MQ_TAG_H -struct blk_mq_tags; +#include <linux/percpu_ida.h> + +/* + * Tag address space map. + */ +struct blk_mq_tags { + unsigned int nr_tags; + unsigned int nr_reserved_tags; + unsigned int nr_batch_move; + unsigned int nr_max_cache; + + struct percpu_ida free_tags; + struct percpu_ida reserved_tags; + + struct request **rqs; + struct list_head page_list; +}; + extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node); extern void blk_mq_free_tags(struct blk_mq_tags *tags); |