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| author | Arianna Avanzini <avanzini.arianna@gmail.com> | 2015-07-07 03:08:15 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-07-07 07:48:51 -0600 |
| commit | a322baad1003798312741b0cb97bd2c7511ccf61 (patch) | |
| tree | a5ea63b7699e989d14b853fb1b691be4819386cb /block | |
| parent | 0762b23d23c1f23beab91a3af0fa89749b75f03c (diff) | |
| download | lwn-a322baad1003798312741b0cb97bd2c7511ccf61.tar.gz lwn-a322baad1003798312741b0cb97bd2c7511ccf61.zip | |
block/blk-cgroup.c: free per-blkcg data when freeing the blkcg
Currently, per-blkcg data is freed each time a policy is deactivated,
that is also upon scheduler switch. However, when switching from a
scheduler implementing a policy which requires per-blkcg data to
another one, that same policy might be active on other devices, and
therefore those same per-blkcg data could be still in use.
This commit lets per-blkcg data be freed when the blkcg is freed
instead of on policy deactivation.
Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
Reported-and-tested-by: Michael Kaminsky <kaminsky@cs.cmu.edu>
Fixes: e48453c3 ("block, cgroup: implement policy-specific per-blkcg data")
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-cgroup.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 9f97da52d006..5e2723f2c6a3 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -822,8 +822,13 @@ static void blkcg_css_free(struct cgroup_subsys_state *css) { struct blkcg *blkcg = css_to_blkcg(css); - if (blkcg != &blkcg_root) + if (blkcg != &blkcg_root) { + int i; + + for (i = 0; i < BLKCG_MAX_POLS; i++) + kfree(blkcg->pd[i]); kfree(blkcg); + } } static struct cgroup_subsys_state * @@ -1162,8 +1167,6 @@ void blkcg_deactivate_policy(struct request_queue *q, kfree(blkg->pd[pol->plid]); blkg->pd[pol->plid] = NULL; - kfree(blkg->blkcg->pd[pol->plid]); - blkg->blkcg->pd[pol->plid] = NULL; spin_unlock(&blkg->blkcg->lock); } |