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block: allow specifying size for extra command data

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This mirrors the blk-mq capabilities to allocate extra drivers-specific
data behind struct request by setting a cmd_size field, as well as having
a constructor / destructor for it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
2017-01-27 09:51:45 -07:00
committed by Jens Axboe
parent 5ea708d15a
commit 6d247d7f71
4 changed files with 61 additions and 17 deletions
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7
include/linux/blkdev.h
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@@ -273,6 +273,8 @@ typedef void (softirq_done_fn)(struct request *);
typedef int (dma_drain_needed_fn)(struct request *);
typedef int (lld_busy_fn) (struct request_queue *q);
typedef int (bsg_job_fn) (struct bsg_job *);
typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
typedef void (exit_rq_fn)(struct request_queue *, struct request *);
enum blk_eh_timer_return {
BLK_EH_NOT_HANDLED,
@@ -408,6 +410,8 @@ struct request_queue {
rq_timed_out_fn *rq_timed_out_fn;
dma_drain_needed_fn *dma_drain_needed;
lld_busy_fn *lld_busy_fn;
init_rq_fn *init_rq_fn;
exit_rq_fn *exit_rq_fn;
const struct blk_mq_ops *mq_ops;
@@ -577,6 +581,9 @@ struct request_queue {
#endif
bool mq_sysfs_init_done;
size_t cmd_size;
void *rq_alloc_data;
};
#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */