linux-kernel - [PATCH 3.12 201/235] Fix regression which breaks DFS mounting

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Message-Id: <f75bde091d91a839aabdd83cac9ad73e09f42429.1485514374.git.jslaby@suse.cz>
Date:   Fri, 27 Jan 2017 11:55:34 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Sachin Prabhu <sprabhu@...hat.com>,
        Steve French <smfrench@...il.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 201/235] Fix regression which breaks DFS mounting

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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: Jiri Slaby <jslaby@...e.cz>
---
 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 7491e8445458..bd54422a260d 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3629,15 +3629,16 @@ 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);
 	}
-- 
2.11.0