Access windows symbolic link from linux cifs

Question

I have created symbolic link of the mapped drive (DOS share) on Windows 7 computer 200.90.12.25. The symbolic link was created using mklink command. Trying to access this from Linux (Raspberry PI) using CIFS command, I get mount error(5): Input/output error. CIFS command and dmesg attached below.

I cannot access the DOS share from Linux because of NETBEUI. Line diagram shown below for reference.

CIFS command

sudo mount -t cifs -o user=username,guest,vers=2.0 //200.90.12.25/DOSA /home/pi/myNAS/myShare

dmesg (also on the Linux client)

[1027098.510573] FS-Cache: Duplicate cookie detected
[1027098.510583] FS-Cache: O-cookie c=c6d9fc6c [p=33027f2d fl=222 nc=2 na=1]
[1027098.510588] FS-Cache: O-cookie d=e8ce4e52 n=203d934d
[1027098.510592] FS-Cache: O-key=[8] '020001bd0a090c12'
[1027098.510606] FS-Cache: N-cookie c=435e27ec [p=33027f2d fl=2 nc=0 na=1]
[1027098.510611] FS-Cache: N-cookie d=e8ce4e52 n=9f19c9a0
[1027098.510614] FS-Cache: N-key=[8] '020001bd0a090c12'
[1027098.515854] CIFS VFS: cifs_mount failed w/return code = -5

As per the suggested comments, i have tried below commands. I got the same mount error(5): Input/output error

sudo mount -t cifs -o username=username,guest,vers=2.1,mfsymlinks //200.90.12.25/DOSA /home/pi/myNAS/myShare

mount.cifs

sudo mount.cifs //200.90.12.25/DOSA /home/pi/myNAS/myShare -o username=username,guest,domain=domain,mfsymlinks 

any alternative solution much appreciated.

Answer 1

Could you please clarify your question just a bit more, you said a windows symlink is what you are trying to mount? Was this created using the mklink command on windows? I'm not sure if it would be possible to use a windows lnk file as a location to mount if that is what you are referring to attempting to mount. You might consider something like what the above poster said:

sudo mount -t cifs -o username=username,guest,vers=2.1,mfsymlinks //200.90.12.25/DOSA /home/pi/myNAS/myShare

According to the man page:

mfsymlinks Enable support for Minshall+French symlinks (see http://wiki.samba.org/index.php/UNIX_Extensions#Minshall.2BFrench_symlinks). This option is ignored when specified together with the sfu option. Minshall+French symlinks are used even if the server supports the CIFS Unix Extensions.

Possible alternative:
I know this sounds like a horrid suggestion, but if you could put a ftpd on the dos box you could use this fuse extension to mount that as a writable filesystem. I have included a link to the sourceforge page below.

Curl FTP Filesystem

Answer 2

Have a look to the Microsoft documentation:
https://docs.microsoft.com/en-us/archive/blogs/josebda/windows-server-2012-r2-which-version-of-the-smb-protocol-smb-1-0-smb-2-0-smb-2-1-smb-3-0-or-smb-3-02-are-you-using

On Windows 7 you should use CIFS/SMB 2.1

I suggest you try this:

sudo mount -t cifs -o username=username,guest,vers=2.1 //200.90.12.25/DOSA /home/pi/myNAS/myShare

This seems to work for some people like mentioned here:
https://github.com/coreos/bugs/issues/2373