writeback, blkcg: propagate non-root blkcg congestion state
authorTejun Heo <tj@kernel.org>
Fri, 22 May 2015 21:13:43 +0000 (17:13 -0400)
committerJens Axboe <axboe@fb.com>
Tue, 2 Jun 2015 14:33:35 +0000 (08:33 -0600)
commit482cf79cdf6669667a914ffd4cbc57a762b55fef
treee4aa049aee0c6d643822fe1a56d404c65c25894d
parentd40f75a06dd675808eed385d490ba9468200b23f
writeback, blkcg: propagate non-root blkcg congestion state

Now that bdi layer can handle per-blkcg bdi_writeback_congested state,
blk_{set|clear}_congested() can propagate non-root blkcg congestion
state to them.

This can be easily achieved by disabling the root_rl tests in
blk_{set|clear}_congested().  Note that we still need those tests when
!CONFIG_CGROUP_WRITEBACK as otherwise we'll end up flipping root blkcg
wb's congestion state for events happening on other blkcgs.

v2: Updated for bdi_writeback_congested.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
block/blk-core.c