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authorShaohua Li <shli@kernel.org>2013-10-15 09:05:03 +0800
committerJens Axboe <axboe@kernel.dk>2013-10-25 11:56:00 +0100
commit1dddc01af0d42b21058e0cb9c1ca9e8d5204d9b0 (patch)
treec2812f72384ee2f4e0d90f65844bdd91a370e8c5 /block
parent7fc2ba17e8bf9f218cac10cc2a3de613d9d9086d (diff)
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>
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