linux-kernel - [PATCH 3.10 111/268] Fix regression which breaks DFS mounting

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Date:   Mon, 19 Jun 2017 20:30:10 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Sachin Prabhu <sprabhu@...hat.com>,
        Steve French <smfrench@...il.com>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 111/268] Fix regression which breaks DFS mounting

From: Sachin Prabhu <sprabhu@...hat.com>

commit d171356ff11ab1825e456dfb979755e01b3c54a1 upstream.

Patch a6b5058 results in -EREMOTE returned by is_path_accessible() in
cifs_mount() to be ignored which breaks DFS mounting.

Signed-off-by: Sachin Prabhu <sprabhu@...hat.com>
Reviewed-by: Aurelien Aptel <aaptel@...e.com>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 fs/cifs/connect.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index cbdc5b0..417ce0a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3622,15 +3622,16 @@ remote_path_check:
 			kfree(full_path);
 			goto mount_fail_check;
 		}
-
-		rc = cifs_are_all_path_components_accessible(server,
-							     xid, tcon, cifs_sb,
-							     full_path);
-		if (rc != 0) {
-			cifs_dbg(VFS, "cannot query dirs between root and final path, "
-				 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
-			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
-			rc = 0;
+		if (rc != -EREMOTE) {
+			rc = cifs_are_all_path_components_accessible(server,
+								     xid, tcon, cifs_sb,
+								     full_path);
+			if (rc != 0) {
+				cifs_dbg(VFS, "cannot query dirs between root and final path, "
+					 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
+				cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
+				rc = 0;
+			}
 		}
 		kfree(full_path);
 	}
-- 
2.8.0.rc2.1.gbe9624a