From: Xiubo Li <xiubli@redhat.com>
Date: Wed, 20 Apr 2022 13:13:02 +0800
Subject: ceph: disable updating the atime since cephfs won't maintain it
Git-commit: f7a2d0688a3b2bb4769402b4c962f54f7b0fc23c
Patch-mainline: v5.19-rc1
References: jsc#SES-1880

Since CephFS makes no attempt to maintain atime, we shouldn't
try to update it in mmap and generic read cases and ignore updating
it in direct and sync read cases.

And even we update it in mmap and generic read cases we will drop
it and won't sync it to MDS. And we are seeing the atime will be
updated and then dropped to the floor again and again.

URL: https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/VSJM7T4CS5TDRFF6XFPIYMHP75K73PZ6/
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Acked-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/addr.c  | 1 -
 fs/ceph/super.c | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index b6edcf89a429..69578cc3749d 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1777,7 +1777,6 @@ int ceph_mmap(struct file *file, struct vm_area_struct *vma)
 
 	if (!mapping->a_ops->readpage)
 		return -ENOEXEC;
-	file_accessed(file);
 	vma->vm_ops = &ceph_vmops;
 	return 0;
 }
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index e6987d295079..b73b4f75462c 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -1119,6 +1119,7 @@ static int ceph_set_super(struct super_block *s, struct fs_context *fc)
 	s->s_time_gran = 1;
 	s->s_time_min = 0;
 	s->s_time_max = U32_MAX;
+	s->s_flags |= SB_NODIRATIME | SB_NOATIME;
 
 	ret = set_anon_super_fc(s, fc);
 	if (ret != 0)