shmem: convert to simple_rename_timestamp

JIRA: https://issues.redhat.com/browse/RHEL-27743

This patch is a backport of the following upstream commit:
commit 944d0d9
Author: Jeff Layton <[email protected]>
Date:   Wed Jul 5 15:00:36 2023 -0400

    shmem: convert to simple_rename_timestamp

    A rename potentially involves updating 4 different inode timestamps.
    Convert to the new simple_rename_timestamp helper function.

    Signed-off-by: Jeff Layton <[email protected]>
    Reviewed-by: Jan Kara <[email protected]>
    Message-Id: <[email protected]>
    Signed-off-by: Christian Brauner <[email protected]>

Signed-off-by: Rafael Aquini <[email protected]>

Author: Rafael Aquini

mm/shmem.c

@@ -3402,9 +3402,7 @@ static int shmem_rename2(struct user_namespace *mnt_userns,
 
 	old_dir->i_size -= BOGO_DIRENT_SIZE;
 	new_dir->i_size += BOGO_DIRENT_SIZE;
-	old_dir->i_ctime = old_dir->i_mtime =
-	new_dir->i_ctime = new_dir->i_mtime =
-	inode->i_ctime = current_time(old_dir);
+	simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
 	inode_inc_iversion(old_dir);
 	inode_inc_iversion(new_dir);
 	return 0;