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cgroup: minor updates around cgroup_clear_directory()

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* Rename it to cgroup_clear_dir() and make it take the pointer to the
  target cgroup instead of the the dentry.  This makes the function
  consistent with its counterpart - cgroup_populate_dir().

* Move cgroup_clear_directory() invocation from cgroup_d_remove_dir()
  to cgroup_remount() so that the function doesn't have to determine
  the cgroup pointer back from the dentry.  cgroup_d_remove_dir() now
  only deals with vfs, which is slightly cleaner.

This patch doesn't introduce any functional differences.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2013-06-28 16:24:10 -07:00
parent 9903883f1d
commit 8f89140ae4
1 changed files with 8 additions and 11 deletions
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19
kernel/cgroup.c
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@ -957,15 +957,14 @@ static void cgroup_rm_file(struct cgroup *cgrp, const struct cftype *cft)
}
/**
* cgroup_clear_directory - selective removal of base and subsystem files
* @dir: directory containing the files
* cgroup_clear_dir - selective removal of base and subsystem files
* @cgrp: target cgroup
* @base_files: true if the base files should be removed
* @subsys_mask: mask of the subsystem ids whose files should be removed
*/
static void cgroup_clear_directory(struct dentry *dir, bool base_files,
unsigned long subsys_mask)
static void cgroup_clear_dir(struct cgroup *cgrp, bool base_files,
unsigned long subsys_mask)
{
struct cgroup *cgrp = __d_cgrp(dir);
struct cgroup_subsys *ss;
for_each_root_subsys(cgrp->root, ss) {
@ -987,9 +986,6 @@ static void cgroup_clear_directory(struct dentry *dir, bool base_files,
static void cgroup_d_remove_dir(struct dentry *dentry)
{
struct dentry *parent;
struct cgroupfs_root *root = dentry->d_sb->s_fs_info;
cgroup_clear_directory(dentry, true, root->subsys_mask);
parent = dentry->d_parent;
spin_lock(&parent->d_lock);
@ -1376,7 +1372,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
* this before rebind_subsystems, since rebind_subsystems may
* change this hierarchy's subsys_list.
*/
cgroup_clear_directory(cgrp->dentry, false, removed_mask);
cgroup_clear_dir(cgrp, false, removed_mask);
ret = rebind_subsystems(root, added_mask, removed_mask);
if (ret) {
@ -4541,9 +4537,10 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
raw_spin_unlock(&release_list_lock);
/*
* Remove @cgrp directory. The removal puts the base ref but we
* aren't quite done with @cgrp yet, so hold onto it.
* Clear and remove @cgrp directory. The removal puts the base ref
* but we aren't quite done with @cgrp yet, so hold onto it.
*/
cgroup_clear_dir(cgrp, true, cgrp->root->subsys_mask);
dget(d);
cgroup_d_remove_dir(d);