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| author | Tejun Heo <tj@kernel.org> | 2013-08-13 11:01:54 -0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-08-13 11:01:54 -0400 |
| commit | 35ef10da65d43211f4cd7e7822cbb3becdfc0ae1 (patch) | |
| tree | 93384946eba30c0de1621d5a5895ae64c1583730 /kernel/cgroup.c | |
| parent | 40e93b39cd5b6a347333a95152ce37deef37bbd0 (diff) | |
| download | lwn-35ef10da65d43211f4cd7e7822cbb3becdfc0ae1.tar.gz lwn-35ef10da65d43211f4cd7e7822cbb3becdfc0ae1.zip | |
cgroup: rename cgroup_subsys_state->dput_work and its callback function
css (cgroup_subsys_state) will become RCU protected and there will be
two stages which require punting to work item during release. To
prepare for using the work item for multiple times, rename
css->dput_work to css->destroy_work and css_dput_fn() to
css_free_work_fn() and move work item initialization from css init to
right before the actual usage.
This reorganization doesn't introduce any behavior change.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 49ad96ee08e1..0b280978f097 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -4259,10 +4259,10 @@ err: return ret; } -static void css_dput_fn(struct work_struct *work) +static void css_free_work_fn(struct work_struct *work) { struct cgroup_subsys_state *css = - container_of(work, struct cgroup_subsys_state, dput_work); + container_of(work, struct cgroup_subsys_state, destroy_work); cgroup_dput(css->cgroup); } @@ -4272,7 +4272,14 @@ static void css_release(struct percpu_ref *ref) struct cgroup_subsys_state *css = container_of(ref, struct cgroup_subsys_state, refcnt); - schedule_work(&css->dput_work); + /* + * css holds an extra ref to @cgrp->dentry which is put on the last + * css_put(). dput() requires process context, which css_put() may + * be called without. @css->destroy_work will be used to invoke + * dput() asynchronously from css_put(). + */ + INIT_WORK(&css->destroy_work, css_free_work_fn); + schedule_work(&css->destroy_work); } static void init_cgroup_css(struct cgroup_subsys_state *css, @@ -4287,14 +4294,6 @@ static void init_cgroup_css(struct cgroup_subsys_state *css, css->flags |= CSS_ROOT; BUG_ON(cgroup_css(cgrp, ss->subsys_id)); cgrp->subsys[ss->subsys_id] = css; - - /* - * css holds an extra ref to @cgrp->dentry which is put on the last - * css_put(). dput() requires process context, which css_put() may - * be called without. @css->dput_work will be used to invoke - * dput() asynchronously from css_put(). - */ - INIT_WORK(&css->dput_work, css_dput_fn); } /* invoke ->css_online() on a new CSS and mark it online if successful */ |