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Commit 8f89140a authored by Tejun Heo's avatar Tejun Heo
Browse files

cgroup: minor updates around cgroup_clear_directory() 



* 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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent 9903883f

kernel/cgroup.c

+8 −11
Original line number Diff line number Diff line
@@ -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,

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);