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Subject[PATCH RFC 9/9] 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.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
mm/shmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index c48239bfa646..6f5941bffa45 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4586,7 +4586,7 @@ 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
--
2.41.0

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