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blkcg: make blkg_conf_prep() take @pol and return with queue lock held

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Add @pol to blkg_conf_prep() and let it return with queue lock held
(to be released by blkg_conf_finish()).  Note that @pol isn't used
yet.

This is to prepare for per-queue policy activation and doesn't cause
any visible difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2012-04-13 13:11:29 -07:00
committed by Jens Axboe
parent 8bd435b30e
commit da8b066262
4 changed files with 14 additions and 10 deletions
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block/blk-throttle.c
+1 -1
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@@ -993,7 +993,7 @@ static int tg_set_conf(struct cgroup *cgrp, struct cftype *cft, const char *buf,
struct throtl_grp *tg;
int ret;
ret = blkg_conf_prep(blkcg, buf, &ctx);
ret = blkg_conf_prep(blkcg, &blkio_policy_throtl, buf, &ctx);
if (ret)
return ret;