cpuset: Minor cgroup2 interface updates

* Rename the partition file from "cpuset.sched.partition" to
  "cpuset.cpus.partition".

* When writing to the partition file, drop "0" and "1" and only accept
  "member" and "root".
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>

Documentation/admin-guide/cgroup-v2.rst

@@ -1708,15 +1708,15 @@ Cpuset Interface Files
 
 	Its value will be affected by memory nodes hotplug events.
 
-  cpuset.sched.partition
+  cpuset.cpus.partition
 	A read-write single value file which exists on non-root
 	cpuset-enabled cgroups.  This flag is owned by the parent cgroup
 	and is not delegatable.
 
         It accepts only the following input values when written to.
 
-        "root" or "1"   - a paritition root
-        "member" or "0" - a non-root member of a partition
+        "root"   - a paritition root
+        "member" - a non-root member of a partition
 
 	When set to be a partition root, the current cgroup is the
 	root of a new partition or scheduling domain that comprises

kernel/cgroup/cpuset.c

@@ -2468,11 +2468,11 @@ static ssize_t sched_partition_write(struct kernfs_open_file *of, char *buf,
 	buf = strstrip(buf);
 
 	/*
-	 * Convert "root"/"1" to 1, and convert "member"/"0" to 0.
+	 * Convert "root" to ENABLED, and convert "member" to DISABLED.
 	 */
-	if (!strcmp(buf, "root") || !strcmp(buf, "1"))
+	if (!strcmp(buf, "root"))
 		val = PRS_ENABLED;
-	else if (!strcmp(buf, "member") || !strcmp(buf, "0"))
+	else if (!strcmp(buf, "member"))
 		val = PRS_DISABLED;
 	else
 		return -EINVAL;
@@ -2631,7 +2631,7 @@ static struct cftype dfl_files[] = {
 	},
 
 	{
-		.name = "sched.partition",
+		.name = "cpus.partition",
 		.seq_show = sched_partition_show,
 		.write = sched_partition_write,
 		.private = FILE_PARTITION_ROOT,