[Samba] strange permission denied problem

[Scott Lovenberg]

Yan Seiner wrote:
> I built an embedded box which uses mount.cifs to mount network 
> shares.    I've shipped several of these and all are working fine 
> except for one, which gives me permission denied on certain files:
>
> root at Mnemosyne:~/mnt/bgrp1/c/Ballance Group Folders/Scully/Client 
> Photos-Scully# cat "Office Pics 002.jpg" > /dev/null
> cat: Office Pics 002.jpg: Permission denied
> root at Mnemosyne:~/mnt/bgrp1/c/Ballance Group Folders/Scully/Client 
> Photos-Scully# cat "Iron & Concrete Table.jpg" > /dev/null
> root at Mnemosyne:~/mnt/bgrp1/c/Ballance Group Folders/Scully/Client 
> Photos-Scully#
>
> So only the Office Pics file gets a permission denied.
>
> root at Mnemosyne:~/mnt/bgrp1/c/Ballance Group Folders/Scully/Client 
> Photos-Scully# ls -al
> dr-xr-x---    1 root     root            0 Mar 28 14:22 .
> dr-xr-x---    1 root     root            0 Mar 27 17:35 ..
> -r--r-----    1 root     root       113826 Mar  3 16:26 Iron & 
> Concrete Table.jpg
> -r--r-----    1 root     root       744886 Feb 21 16:14 Nightstands.jpg
> -r--r-----    1 root     root       765452 Feb 15 19:09 Occhio Chair.jpg
> -r--r-----    1 root     root        90670 Mar 28 14:22 Office Pics 
> 002.jpg
>
> cat /proc/mounts  says:
> //bgrp1/c /tmp/mnt/bgrp1/c cifs 
> ro,mand,nodiratime,unc=\\bgrp1\c,username=root,domain=,rsize=4100,wsize=4100 
> 0 0
>
> and the mount line itself is
> mount.cifs "//$server/$wshare" /tmp/mnt/$server/$lshare -o 
> ip=$target,guest,ro,file_mode=0440,dir_mode=0550
>
> I can't for the life of me figure out why some files give me a 
> permission denied.  I have no physical access to the problem box; 
> here's what I know:
>
> ------------------------------------------+
> Looking up status of 192.168.0.2
>    BGRP1           <00> -         B <ACTIVE>
>    MSHOME          <00> - <GROUP> B <ACTIVE>
>    BGRP1           <20> -         B <ACTIVE>
>    MSHOME          <1e> - <GROUP> B <ACTIVE>
>    MSHOME          <1d> -         B <ACTIVE>
>    ..__MSBROWSE__. <01> - <GROUP> B <ACTIVE>
>
>    MAC Address = 00-19-DB-A6-43-23
>
> ------------------------------------------+
>
>    Sharename       Type      Comment
>    ---------       ----      -------
>    IPC$            IPC       Remote IPC
>    D$              Disk      Default share
>    C               Disk        Ballance Group Folders Disk        
> F               Disk        ADMIN$          Disk      Remote Admin
>    C$              Disk      Default share
>
>    Server               Comment
>    ---------            -------
>
>    Workgroup            Master
>
> How do I go about diagnosing this?
>
> Thanks,
>
> --Yan
>
Does 'lsof' show the file as opened and locked by chance?  I've seen 
something to this effect with a stale lock (had to reboot the server - 
although I'm sure there is a guru technique to blow away the entry in 
the open files table, and it's probably elegant too!)  In my case, it 
made the load increase, as it thought it was I/O blocked.  Are you 
seeing any outrageous load averages in 'uptime'?  I was in the hundreds, 
but the box was responding like it was at a 0.5 or so.