blk_init_queue() allocates the request_queue structure and then initializes it as needed (request_fn, elevator, etc). Split initialization out to blk_init_allocated_queue_node. Introduce blk_init_allocated_queue wrapper function to model existing blk_init_queue and blk_init_queue_node interfaces. Export elv_register_queue to allow a newly added elevator to be registered with sysfs. Export elv_unregister_queue for symmetry. These changes allow DM to initialize a device's request_queue with more precision. In particular, DM no longer unconditionally initializes a full request_queue (elevator et al). It only does so for a request-based DM device.
Showing the changes to include/linux/blkdev.h (1 of 3 files). Show all
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| @@ -921,7 +921,12 @@ extern void blk_abort_queue(struct request_queue *); · 920 unmodified lines | |||
| 921 | */ | 921 | */ |
| 922 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, | 922 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
| 923 | spinlock_t *lock, int node_id); | 923 | spinlock_t *lock, int node_id); |
| 924 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, | ||
| 925 | request_fn_proc *, | ||
| 926 | spinlock_t *, int node_id); | ||
| 924 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); | 927 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
| 928 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, | ||
| 929 | request_fn_proc *, spinlock_t *); | ||
| 925 | extern void blk_cleanup_queue(struct request_queue *); | 930 | extern void blk_cleanup_queue(struct request_queue *); |
| 926 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | 931 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
| 927 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | 932 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |