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authorMike Snitzer <snitzer@redhat.com>2010-05-11 08:57:42 +0200
committerJens Axboe <jens.axboe@oracle.com>2010-05-11 08:57:42 +0200
commit01effb0dc1451fad55925873ffbfb88fa4eadce0 (patch)
tree40fc70111217d23bbb5453fe08214d28ed4c7713 /block/elevator.c
parent0f3942a39ed768c967cb71ea0e9be7fc94112713 (diff)
downloadop-kernel-dev-01effb0dc1451fad55925873ffbfb88fa4eadce0.zip
op-kernel-dev-01effb0dc1451fad55925873ffbfb88fa4eadce0.tar.gz
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.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 5e73459..6df2b50 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)
{
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