Samba: CIFS debugging

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In case you need to hunt nasty things with smbfs/cifs on the GNU/Linux-Samba side, it might be a good idea to enable CIFS debugging messages:

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echo 1 > /proc/fs/cifs/cifsFYI

You can then check status of mounted CIFS shares, like this:

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cat /proc/fs/cifs/DebugData

WARNING: Enabling this debug information can really (like "really!") fill up your logfiles!
On my system, I've recently had a 30 GB (!) "/var/log/kern.log" file, a 23 GB "/var/log/syslog" - and a 32 GB "/var/log/debug"
So be careful and don't enable this option for too long.

Additionally, here's a list of smbfs/cifs related threads, here in "Das-Werkstatt" forum:

• Samba: "error(11): Resource temporarily unavailable"
• Debian Lenny: Samba upgrade error "user" CIFS mounts broken
• Samba: mount error(12): Cannot allocate memory
• Samba: mount error 113 = No route to host
• Samba: "kernel BUG at fs/cifs/cifs_dfs_ref.c:274!"
• SMBFS: "mount error: permission denied or not superuser..."
• umount: This utility only unmounts cifs filesystems.
• Samba: "error(101): Network is unreachable"
• Samba mount failed: "CIFS VFS: No username specified"
• Samba mount failed: "CIFS VFS: cifs_mount failed w/return code = -22"
• Samba: Error connecting to socket. Return code -113
• mount: failed to parse mount options
• Resolve windows netbios names in fstab

And here are links to additional information:

• Why You Should Never Again Utter The Word, “CIFS” (by Stephen Foskett)
• What version of SMB2 am I using on my Windows file server? (by Jose Barreto)