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author | Mike Snitzer <snitzer@redhat.com> | 2010-05-11 06:57:42 (GMT) |
---|---|---|
committer | Jens Axboe <jens.axboe@oracle.com> | 2010-05-11 06:57:42 (GMT) |
commit | 01effb0dc1451fad55925873ffbfb88fa4eadce0 (patch) | |
tree | 40fc70111217d23bbb5453fe08214d28ed4c7713 /block/blk-core.c | |
parent | 0f3942a39ed768c967cb71ea0e9be7fc94112713 (diff) | |
download | linux-fsl-qoriq-01effb0dc1451fad55925873ffbfb88fa4eadce0.tar.xz |
block: allow initialization of previously allocated request_queue
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.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-core.c')
-rw-r--r-- | block/blk-core.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index e9a5ae2..3bc5579 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -572,6 +572,22 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) { struct request_queue *q = blk_alloc_queue_node(GFP_KERNEL, node_id); + return blk_init_allocated_queue_node(q, rfn, lock, node_id); +} +EXPORT_SYMBOL(blk_init_queue_node); + +struct request_queue * +blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn, + spinlock_t *lock) +{ + return blk_init_allocated_queue_node(q, rfn, lock, -1); +} +EXPORT_SYMBOL(blk_init_allocated_queue); + +struct request_queue * +blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn, + spinlock_t *lock, int node_id) +{ if (!q) return NULL; @@ -605,7 +621,7 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) blk_put_queue(q); return NULL; } -EXPORT_SYMBOL(blk_init_queue_node); +EXPORT_SYMBOL(blk_init_allocated_queue_node); int blk_get_queue(struct request_queue *q) { |