ns: rename to __ns_ref

Make it easier to grep and rename to ns_count.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/namespace.c

@@ -6015,7 +6015,7 @@ struct mnt_namespace init_mnt_ns = {
 	.ns.inum	= PROC_MNT_INIT_INO,
 	.ns.ops		= &mntns_operations,
 	.user_ns	= &init_user_ns,
-	.ns.count	= REFCOUNT_INIT(1),
+	.ns.__ns_ref	= REFCOUNT_INIT(1),
 	.passive	= REFCOUNT_INIT(1),
 	.mounts		= RB_ROOT,
 	.poll		= __WAIT_QUEUE_HEAD_INITIALIZER(init_mnt_ns.poll),

include/linux/ns_common.h

@@ -29,7 +29,7 @@ struct ns_common {
 	struct dentry *stashed;
 	const struct proc_ns_operations *ops;
 	unsigned int inum;
-	refcount_t count;
+	refcount_t __ns_ref; /* do not use directly */
 	union {
 		struct {
 			u64 ns_id;
@@ -93,19 +93,19 @@ void __ns_common_free(struct ns_common *ns);
 
 static __always_inline __must_check bool __ns_ref_put(struct ns_common *ns)
 {
-	return refcount_dec_and_test(&ns->count);
+	return refcount_dec_and_test(&ns->__ns_ref);
 }
 
 static __always_inline __must_check bool __ns_ref_get(struct ns_common *ns)
 {
-	return refcount_inc_not_zero(&ns->count);
+	return refcount_inc_not_zero(&ns->__ns_ref);
 }
 
-#define ns_ref_read(__ns) refcount_read(&to_ns_common((__ns))->count)
-#define ns_ref_inc(__ns) refcount_inc(&to_ns_common((__ns))->count)
+#define ns_ref_read(__ns) refcount_read(&to_ns_common((__ns))->__ns_ref)
+#define ns_ref_inc(__ns) refcount_inc(&to_ns_common((__ns))->__ns_ref)
 #define ns_ref_get(__ns) __ns_ref_get(to_ns_common((__ns)))
 #define ns_ref_put(__ns) __ns_ref_put(to_ns_common((__ns)))
 #define ns_ref_put_and_lock(__ns, __lock) \
-	refcount_dec_and_lock(&to_ns_common((__ns))->count, (__lock))
+	refcount_dec_and_lock(&to_ns_common((__ns))->__ns_ref, (__lock))
 
 #endif

init/version-timestamp.c

@@ -8,7 +8,7 @@
 #include <linux/utsname.h>
 
 struct uts_namespace init_uts_ns = {
-	.ns.count = REFCOUNT_INIT(2),
+	.ns.__ns_ref = REFCOUNT_INIT(2),
 	.name = {
 		.sysname	= UTS_SYSNAME,
 		.nodename	= UTS_NODENAME,

ipc/msgutil.c

@@ -27,7 +27,7 @@ DEFINE_SPINLOCK(mq_lock);
  * and not CONFIG_IPC_NS.
  */
 struct ipc_namespace init_ipc_ns = {
-	.ns.count = REFCOUNT_INIT(1),
+	.ns.__ns_ref = REFCOUNT_INIT(1),
 	.user_ns = &init_user_ns,
 	.ns.inum = PROC_IPC_INIT_INO,
 #ifdef CONFIG_IPC_NS

kernel/cgroup/cgroup.c

@@ -219,7 +219,7 @@ static bool have_favordynmods __ro_after_init = IS_ENABLED(CONFIG_CGROUP_FAVOR_D
 
 /* cgroup namespace for init task */
 struct cgroup_namespace init_cgroup_ns = {
-	.ns.count	= REFCOUNT_INIT(2),
+	.ns.__ns_ref	= REFCOUNT_INIT(2),
 	.user_ns	= &init_user_ns,
 	.ns.ops		= &cgroupns_operations,
 	.ns.inum	= PROC_CGROUP_INIT_INO,

kernel/nscommon.c

@@ -5,7 +5,7 @@
 
 int __ns_common_init(struct ns_common *ns, const struct proc_ns_operations *ops, int inum)
 {
-	refcount_set(&ns->count, 1);
+	refcount_set(&ns->__ns_ref, 1);
 	ns->stashed = NULL;
 	ns->ops = ops;
 	ns->ns_id = 0;

kernel/pid.c

@@ -71,7 +71,7 @@ static int pid_max_max = PID_MAX_LIMIT;
  * the scheme scales to up to 4 million PIDs, runtime.
  */
 struct pid_namespace init_pid_ns = {
-	.ns.count = REFCOUNT_INIT(2),
+	.ns.__ns_ref = REFCOUNT_INIT(2),
 	.idr = IDR_INIT(init_pid_ns.idr),
 	.pid_allocated = PIDNS_ADDING,
 	.level = 0,

kernel/time/namespace.c

@@ -480,7 +480,7 @@ const struct proc_ns_operations timens_for_children_operations = {
 };
 
 struct time_namespace init_time_ns = {
-	.ns.count	= REFCOUNT_INIT(3),
+	.ns.__ns_ref	= REFCOUNT_INIT(3),
 	.user_ns	= &init_user_ns,
 	.ns.inum	= PROC_TIME_INIT_INO,
 	.ns.ops		= &timens_operations,

kernel/user.c

@@ -65,7 +65,7 @@ struct user_namespace init_user_ns = {
 			.nr_extents = 1,
 		},
 	},
-	.ns.count = REFCOUNT_INIT(3),
+	.ns.__ns_ref = REFCOUNT_INIT(3),
 	.owner = GLOBAL_ROOT_UID,
 	.group = GLOBAL_ROOT_GID,
 	.ns.inum = PROC_USER_INIT_INO,