[linux-cifs-client] CIFS regression in 2.6.26

[Jeff Layton]

On Mon, 4 Aug 2008 19:32:59 +0200
mkoegler at auto.tuwien.ac.at (Martin Koegler) wrote:

> Upgrading the kernel from 2.6.25 to 2.6.26 broke CIFS again. KDE
> refuses to start on a CIFS homedirectory now. Some testing showed, that
> fundamental operations are not working any more:
> 
> | $ls -l
> | total 4
> | -rwxrw-r--  1 user group 7 2008-08-04 19:01 xxx
> | lrwxrwxrwx  1 user group 3 2008-08-04 19:09 xxx2 -> xxx
> | $ln -s xxx xxx1 
> | ln: creating symbolic link `xxx1' to `xxx': No such file or directory
> | $ls -l
> | total 4
> | -rwxrw-r--  1 user group 7 2008-08-04 19:01 xxx
> | lrwxrwxrwx  1 user group 3 2008-08-04 19:09 xxx2 -> xxx
> | $touch xxx3
> | touch: setting times of `xxx3': No such file or directory
> | $ls -l
> | total 4
> | -rwxrw-r--  1 user group 11 2008-08-04 19:20 xxx
> | lrwxrwxrwx  1 user group  3 2008-08-04 19:09 xxx2 -> xxx
> | -rwxrw-r--  1 user group  0 2008-08-04 19:19 xxx3
> 
> Appending to xxx via "echo 'xxx' >> xxx seems to work, but editors
> like vi seem to refuse to save change to xxx. Creating new files is
> working.
> 
> New version: vanilla 2.6.26
> | $cat /proc/fs/cifs/DebugData 
> | Display Internal CIFS Data Structures for Debugging
> | ---------------------------------------------------
> | CIFS Version 1.53
> | Active VFS Requests: 0
> | Servers:
> | 1) Name: XXXX  Domain: XXXXXXX Mounts: 2 OS: Unix  
> |         NOS: Samba 3.0.24       Capability: 0x80f3fd
> |         SMB session status: 1   TCP status: 1
> |         Local Users To Server: 1 SecMode: 0x3 Req On Wire: 0
> | MIDs:
> | 
> | Shares:
> | 1) \\XXXXXXXXXXXX\XXXXXXXXXXX Uses: 1 Type: NTFS DevInfo: 0x0 Attributes: 0x2b
> | PathComponentMax: 255 Status: 1 type: 0 
> | 2) \\XXXXXXXXXXXX\XXXXXXXXXX Uses: 1 Type: NTFS DevInfo: 0x0 Attributes: 0x2b
> | PathComponentMax: 255 Status: 1 type: 0 
> | $cat /proc/fs/cifs/LinuxExtensionsEnabled 
> | 1
> | $uname -a
> | Linux XXXX 2.6.26 #1 SMP PREEMPT Thu Jul 31 00:39:25 CEST 2008 i686 GNU/Linux
> 
> Kernel-Options:
> | CONFIG_CIFS=m
> | # CONFIG_CIFS_STATS is not set
> | # CONFIG_CIFS_WEAK_PW_HASH is not set
> | CONFIG_CIFS_XATTR=y
> | CONFIG_CIFS_POSIX=y
> | # CONFIG_CIFS_DEBUG2 is not set
> | # CONFIG_CIFS_EXPERIMENTAL is not set
> 
> 2.6.26.1 contains the same CIFS sources as 2.6.26, so it should change nothing.
> 
> Old version: vanilla 2.6.25 +  PATCH: "[CIFS] Fix UNC path prefix on QueryUnixPathInfo to have correct slash"
> 
> Mount options in both cases:
> rw,mand,unc=\\XXXXXXXXXXX\XXXXXXXXXX,username=XXXXXX,posixpaths,serverino,rsize=16384,wsize=57344
> 
> mfg Martin Köler
> 

Sounds like problems constructing a proper pathname...

The mount options unfortunately don't show the prefixpath (if any).
What's the actual "devicename" that you're mounting? If you're mounting
a subdirectory of a share (for instance, //host/share/subdir), then
you may need to update your mount.cifs helper to something more
recent.
-- 
Jeff Layton <jlayton at redhat.com>