From: Jeff Layton <jlayton@kernel.org>
Date: Wed, 2 Oct 2024 21:27:27 +0000 (-0400)
Subject: tmpfs: add support for multigrain timestamps
X-Git-Tag: v6.13-rc1~231^2~1^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=234d8895e3ad8ddb93d687d665086bd303901d87;p=thirdparty%2Fkernel%2Flinux.git

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: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # documentation bits
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20241002-mgtime-v10-12-d1c4717f5284@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/mm/shmem.c b/mm/shmem.c
index 5a77acf6ac6a6..5f17eaaa32e29 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4804,7 +4804,7 @@ static struct file_system_type shmem_fs_type = {
 	.parameters	= shmem_fs_parameters,
 #endif
 	.kill_sb	= kill_litter_super,
-	.fs_flags	= FS_USERNS_MOUNT | FS_ALLOW_IDMAP,
+	.fs_flags	= FS_USERNS_MOUNT | FS_ALLOW_IDMAP | FS_MGTIME,
 };
 
 void __init shmem_init(void)