tmpfs: add support for multigrain timestamps

Enable multigrain timestamps, which should ensure that there is an
apparent change to the timestamp whenever it has been written after
being actively observed via getattr.

tmpfs only requires the FS_MGTIME flag.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Message-Id: <20230807-mgctime-v7-10-d1dec143a704@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index 142ead7..98cc4be 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4220,7 +4220,7 @@ static struct file_system_type shmem_fs_type = {
 #endif
        .kill_sb        = kill_litter_super,
 #ifdef CONFIG_SHMEM
-       .fs_flags       = FS_USERNS_MOUNT | FS_ALLOW_IDMAP,
+       .fs_flags       = FS_USERNS_MOUNT | FS_ALLOW_IDMAP | FS_MGTIME,
 #else
        .fs_flags       = FS_USERNS_MOUNT,
 #endif