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[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: Martin Koegler <mkoegler@auto.tuwien.ac.at>
Acked-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2008-10-16 18:35:21 +00:00
parent 7591103c08
commit 2c1b861539
2 changed files with 12 additions and 0 deletions
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3
fs/cifs/README
View File

@ -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

9
fs/cifs/connect.c
View File

@ -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);