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| author | Mike Snitzer <snitzer@redhat.com> | 2010-05-11 10:57:42 +0400 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-05-11 10:57:42 +0400 |
| commit | 01effb0dc1451fad55925873ffbfb88fa4eadce0 (patch) | |
| tree | 40fc70111217d23bbb5453fe08214d28ed4c7713 /block/elevator.c | |
| parent | 0f3942a39ed768c967cb71ea0e9be7fc94112713 (diff) | |
| download | linux-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/elevator.c')
| -rw-r--r-- | block/elevator.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c index 5e734592bb40..6df2b5056b51 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -930,6 +930,7 @@ int elv_register_queue(struct request_queue *q) } return error; } +EXPORT_SYMBOL(elv_register_queue); static void __elv_unregister_queue(struct elevator_queue *e) { @@ -942,6 +943,7 @@ void elv_unregister_queue(struct request_queue *q) if (q) __elv_unregister_queue(q->elevator); } +EXPORT_SYMBOL(elv_unregister_queue); void elv_register(struct elevator_type *e) { |