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| author | Tejun Heo <tj@kernel.org> | 2012-03-05 13:15:11 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-03-06 21:27:23 +0100 |
| commit | 7ee9c5620504906e98451dc9a1945b2b9e892cb8 (patch) | |
| tree | 1daf4d9fc8d03ebbc88ceedb7abeec46d8c71df3 /block/cfq-iosched.c | |
| parent | 92616b5b3a7c7fa8148df82e7ff6183056f2bfc8 (diff) | |
| download | lwn-7ee9c5620504906e98451dc9a1945b2b9e892cb8.tar.gz lwn-7ee9c5620504906e98451dc9a1945b2b9e892cb8.zip | |
blkcg: let blkio_group point to blkio_cgroup directly
Currently, blkg points to the associated blkcg via its css_id. This
unnecessarily complicates dereferencing blkcg. Let blkg hold a
reference to the associated blkcg and point directly to it and disable
css_id on blkio_subsys.
This change requires splitting blkiocg_destroy() into
blkiocg_pre_destroy() and blkiocg_destroy() so that all blkg's can be
destroyed and all the blkcg references held by them dropped during
cgroup removal.
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/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index f67d109eb974..9ef86fbfc9ae 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1133,6 +1133,10 @@ static void cfq_put_cfqg(struct cfq_group *cfqg) cfqg->ref--; if (cfqg->ref) return; + + /* release the extra blkcg reference this blkg has been holding */ + css_put(&cfqg->blkg.blkcg->css); + for_each_cfqg_st(cfqg, i, j, st) BUG_ON(!RB_EMPTY_ROOT(&st->rb)); free_percpu(cfqg->blkg.stats_cpu); |