tree c2812f72384ee2f4e0d90f65844bdd91a370e8c5
parent 7fc2ba17e8bf9f218cac10cc2a3de613d9d9086d
author Shaohua Li <shli@kernel.org> 1381799103 +0800
committer Jens Axboe <axboe@kernel.dk> 1382698560 +0100

percpu_ida: add an API to return free tags

Add an API to return free tags, blk-mq-tag will use it.

Note, this just returns a snapshot of free tags number. blk-mq-tag has
two usages of it. One is for info output for diagnosis. The other is to
quickly check if there are free tags for request dispatch checking.
Neither requires very precise.

Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>