From: Jeff Layton <jlayton@kernel.org>
Date: Mon, 7 Aug 2023 19:38:43 +0000 (-0400)
Subject: ext4: switch to multigrain timestamps
X-Git-Tag: v6.6-rc1~220^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0269b585868e59b6a2ecc6ea685d39310e4fc18b;p=thirdparty%2Fkernel%2Flinux.git

ext4: switch to 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.

For ext4, we only need to enable the FS_MGTIME flag.

Acked-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Message-Id: <20230807-mgctime-v7-12-d1dec143a704@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b54c70e1a74e7..cb1ff47af1561 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -7279,7 +7279,7 @@ static struct file_system_type ext4_fs_type = {
 	.init_fs_context	= ext4_init_fs_context,
 	.parameters		= ext4_param_specs,
 	.kill_sb		= kill_block_super,
-	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME,
 };
 MODULE_ALIAS_FS("ext4");