aboutsummaryrefslogtreecommitdiff
path: root/block/blk-core.c
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2012-03-05 13:15:19 -0800
committerJens Axboe <axboe@kernel.dk>2012-03-06 21:27:23 +0100
commit03aa264ac15637b6f98374270bcdf31400965505 (patch)
tree6fa9ca54d3f775fba19123790f6655158034a1d8 /block/blk-core.c
parent4eef3049986e8397d5003916aed8cad6567a5e02 (diff)
blkcg: let blkcg core manage per-queue blkg list and counter
With the previous patch to move blkg list heads and counters to request_queue and blkg, logic to manage them in both policies are almost identical and can be moved to blkcg core. This patch moves blkg link logic into blkg_lookup_create(), implements common blkg unlink code in blkg_destroy(), and updates blkg_destory_all() so that it's policy specific and can skip root group. The updated blkg_destroy_all() is now used to both clear queue for bypassing and elv switching, and release all blkgs on q exit. This patch introduces a race window where policy [de]registration may race against queue blkg clearing. This can only be a problem on cfq unload and shouldn't be a real problem in practice (and we have many other places where this race already exists). Future patches will remove these unlikely races. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-core.c')
0 files changed, 0 insertions, 0 deletions