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@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@Mnemosyne:~/mnt/bgrp1/c/Ballance Group Folders/Scully/Client
Photos-Scully# cat "Iron & Concrete Table.jpg" > /dev/null
root@Mnemosyne:~/mnt/bgrp1/c/Ballance Group Folders/Scully/Client
Photos-Scully#
So only the Office Pics file gets a permission denied.
root@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
--
o__
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(_)\(_) ,>/'_ o__
Yan Seiner (_)\(_) ,>/'_ o__
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Who says engineers have to be pencil necked geeks? (_)\(_)
Help out my kids' school: http://www.seiner.com/blog/Travels/
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@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@Mnemosyne:~/mnt/bgrp1/c/Ballance Group Folders/Scully/Client > Photos-Scully# cat "Iron & Concrete Table.jpg" > /dev/null > root@Mnemosyne:~/mnt/bgrp1/c/Ballance Group Folders/Scully/Client > Photos-Scully# > > So only the Office Pics file gets a permission denied. > > root@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.