FAILED: patch "[PATCH] cifs: add missing parsing of backupuid" failed to apply to 5.13-stable tree

The patch below does not apply to the 5.13-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to [off-list ref].

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b946dbcfa4df80ec81b442964e07ad37000cc059 Mon Sep 17 00:00:00 2001
From: Ronnie Sahlberg <redacted>
Date: Wed, 28 Jul 2021 16:38:29 +1000
Subject: [PATCH] cifs: add missing parsing of backupuid

We lost parsing of backupuid in the switch to new mount API.
Add it back.

Signed-off-by: Ronnie Sahlberg <redacted>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Cc: <redacted> # v5.11+
Reported-by: Xiaoli Feng <redacted>
Signed-off-by: Steve French <redacted>

diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 9a59d7ff9a11..eed59bc1d913 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c

@@ -925,6 +925,13 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 		ctx->cred_uid = uid;
 		ctx->cruid_specified = true;
 		break;
+	case Opt_backupuid:
+		uid = make_kuid(current_user_ns(), result.uint_32);
+		if (!uid_valid(uid))
+			goto cifs_parse_mount_err;
+		ctx->backupuid = uid;
+		ctx->backupuid_specified = true;
+		break;
 	case Opt_backupgid:
 		gid = make_kgid(current_user_ns(), result.uint_32);
 		if (!gid_valid(gid))