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Subject[PATCH 4.4 003/266] cifs: do not attempt cifs operation on smb2+ rename error
Date
From: Frank Sorenson <sorenson@redhat.com>

commit 652727bbe1b17993636346716ae5867627793647 upstream.

A path-based rename returning EBUSY will incorrectly try opening
the file with a cifs (NT Create AndX) operation on an smb2+ mount,
which causes the server to force a session close.

If the mount is smb2+, skip the fallback.

Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/cifs/inode.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1669,6 +1669,10 @@ cifs_do_rename(const unsigned int xid, s
if (rc == 0 || rc != -EBUSY)
goto do_rename_exit;

+ /* Don't fall back to using SMB on SMB 2+ mount */
+ if (server->vals->protocol_id != 0)
+ goto do_rename_exit;
+
/* open-file renames don't work across directories */
if (to_dentry->d_parent != from_dentry->d_parent)
goto do_rename_exit;

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