Commit 2c1b8615 authored by Steve French's avatar Steve French
Browse files

[CIFS] Add nodfs mount option 


Older samba server (eg. 3.0.24 from Debian etch) don't work correctly,
if DFS paths are used. Such server claim that they support DFS, but fail
to process some requests with DFS paths. Starting with Linux 2.6.26,
the cifs clients starts sending DFS paths in such situations, rendering
it unuseable with older samba servers.

The nodfs mount options forces a share to be used with non DFS paths,
even if the server claims, that it supports it.

Signed-off-by: default avatarMartin Koegler <mkoegler@auto.tuwien.ac.at>
Acked-by: default avatarJeff Layton <jlayton@redhat.com>
Acked-by: default avatarIgor Mammedov <niallain@gmail.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 7591103c

fs/cifs/README

+3 −0
Original line number Diff line number Diff line
@@ -463,6 +463,9 @@ A partial list of the supported mount options follows: 
		with cifs style mandatory byte range locks (and most

		cifs servers do not yet support requesting advisory

		byte range locks).

 nodfs          Disable DFS (global name space support) even if the

		server claims to support it.  This can help work around

		a problem with parsing of DFS paths with Samba 3.0.24 server.

 remount        remount the share (often used to change from ro to rw mounts

	        or vice versa)

 cifsacl        Report mode bits (e.g. on stat) based on the Windows ACL for

fs/cifs/connect.c

+9 −0
Original line number Diff line number Diff line
@@ -90,6 +90,7 @@ struct smb_vol { 
	bool nocase:1;     /* request case insensitive filenames */

	bool nobrl:1;      /* disable sending byte range locks to srv */

	bool seal:1;       /* request transport encryption on share */

	bool nodfs:1;

	unsigned int rsize;

	unsigned int wsize;

	unsigned int sockopt;
@@ -1218,6 +1219,8 @@ cifs_parse_mount_options(char *options, const char *devname, 
			vol->sfu_emul = 1;

		} else if (strnicmp(data, "nosfu", 5) == 0) {

			vol->sfu_emul = 0;

		} else if (strnicmp(data, "nodfs", 5) == 0) {

			vol->nodfs = 1;

		} else if (strnicmp(data, "posixpaths", 10) == 0) {

			vol->posix_paths = 1;

		} else if (strnicmp(data, "noposixpaths", 12) == 0) {
@@ -2197,6 +2200,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, 
						volume_info.UNC,

						tcon, cifs_sb->local_nls);

					cFYI(1, ("CIFS Tcon rc = %d", rc));

					if (volume_info.nodfs) {

						tcon->Flags &=

							~SMB_SHARE_IS_IN_DFS;

						cFYI(1, ("DFS disabled (%d)",

							tcon->Flags));

					}

				}

				if (!rc) {

					atomic_inc(&pSesInfo->inUse);

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