Merge tag 'vfs-7.3-rc1.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull mount updates from Christian Brauner:

 - Make the legacy mount API notify pollers of propagation changes.

   Changing propagation via change_mnt_propagation() or with
   MOVE_MOUNT_SET_GROUP update the propagation relationship of the
   target mount. But unlike mount_setattr() neither path touched the
   affected mount namespace. So pollers of /proc/<pid>/mountinfo were
   never woken.

 - Also remove a redundant panic() in mnt_init()

* tag 'vfs-7.3-rc1.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  mount: remove redundant panic() in mnt_init()
  fs/namespace: notify pollers of legacy propagation changes

1 files changed, 7 insertions, 3 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index 426ac9e4eece..3c382c2bdeec 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2908,6 +2908,9 @@ static int do_change_type(const struct path *path, int ms_flags)
 	for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL))
 		change_mnt_propagation(m, type);
 
+	guard(mount_locked_reader)();
+	touch_mnt_namespace(mnt->mnt_ns);
+
 	return 0;
 }
 
@@ -3481,6 +3484,10 @@ static int do_set_group(const struct path *from_path, const struct path *to_path
 		list_add(&to->mnt_share, &from->mnt_share);
 		set_mnt_shared(to);
 	}
+
+	guard(mount_locked_reader)();
+	touch_mnt_namespace(to->mnt_ns);
+
 	return 0;
 }
 
@@ -6263,9 +6270,6 @@ void __init mnt_init(void)
 				HASH_ZERO,
 				&mp_hash_shift, &mp_hash_mask, 0, 0);
 
-	if (!mount_hashtable || !mountpoint_hashtable)
-		panic("Failed to allocate mount hash table\n");
-
 	kernfs_init();
 
 	err = sysfs_init();