Commit 0d19ea86 authored by Li Zefan's avatar Li Zefan Committed by Tejun Heo

cgroup: fix to allow mounting a hierarchy by name

If we mount a hierarchy with a specified name, the name is unique,
and we can use it to mount the hierarchy without specifying its
set of subsystem names. This feature is documented is
Documentation/cgroups/cgroups.txt section 2.3

Here's an example:

	# mount -t cgroup -o cpuset,name=myhier xxx /cgroup1
	# mount -t cgroup -o name=myhier xxx /cgroup2

But it was broken by commit 32a8cf23
(cgroup: make the mount options parsing more accurate)

This fixes the regression.
Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
parent 305f3c8b
...@@ -1193,10 +1193,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts) ...@@ -1193,10 +1193,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
/* /*
* If the 'all' option was specified select all the subsystems, * If the 'all' option was specified select all the subsystems,
* otherwise 'all, 'none' and a subsystem name options were not * otherwise if 'none', 'name=' and a subsystem name options
* specified, let's default to 'all' * were not specified, let's default to 'all'
*/ */
if (all_ss || (!all_ss && !one_ss && !opts->none)) { if (all_ss || (!one_ss && !opts->none && !opts->name)) {
for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) { for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
struct cgroup_subsys *ss = subsys[i]; struct cgroup_subsys *ss = subsys[i];
if (ss == NULL) if (ss == NULL)
......
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