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| author | Tejun Heo <tj@kernel.org> | 2022-08-27 19:04:40 -1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-01 18:08:44 +0200 |
| commit | e2691f6b44ed2135bfd005ad5fbabac4f433a7a1 (patch) | |
| tree | a1f35cf32893a9f95c33930c00ca295aef701893 /kernel/cgroup/cgroup.c | |
| parent | 783bd07d095b722108725af11113795ee046ed0e (diff) | |
| download | linux-stable-e2691f6b44ed2135bfd005ad5fbabac4f433a7a1.tar.gz linux-stable-e2691f6b44ed2135bfd005ad5fbabac4f433a7a1.tar.bz2 linux-stable-e2691f6b44ed2135bfd005ad5fbabac4f433a7a1.zip | |
cgroup: Implement cgroup_file_show()
Add cgroup_file_show() which allows toggling visibility of a cgroup file
using the new kernfs_show(). This will be used to hide psi interface files
on cgroups where it's disabled.
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-10-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/cgroup/cgroup.c')
| -rw-r--r-- | kernel/cgroup/cgroup.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index ffaccd6373f1..217469a1ea29 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -4340,6 +4340,26 @@ void cgroup_file_notify(struct cgroup_file *cfile) } /** + * cgroup_file_show - show or hide a hidden cgroup file + * @cfile: target cgroup_file obtained by setting cftype->file_offset + * @show: whether to show or hide + */ +void cgroup_file_show(struct cgroup_file *cfile, bool show) +{ + struct kernfs_node *kn; + + spin_lock_irq(&cgroup_file_kn_lock); + kn = cfile->kn; + kernfs_get(kn); + spin_unlock_irq(&cgroup_file_kn_lock); + + if (kn) + kernfs_show(kn, show); + + kernfs_put(kn); +} + +/** * css_next_child - find the next child of a given css * @pos: the current position (%NULL to initiate traversal) * @parent: css whose children to walk |