Hi, I'm Omar Walid Llorente and I am a systems administrator at the
Politechnical University of Madrid (UPM), Spain. I write you in the hope
you can help us manage a problem that have discovered recently about our
new datastore architecture in our teaching labs. We have created a
gluster distributed volume that we reexport with NFS to our lab clients
via intermediate servers.
First of all thanks for all your work and sorry if this isn't related
with your package, but I think it has a good chance. I'll try explain
myself as short as possible.
As introduced previously, we have a problem exporting with
nfs-kernel-server-1.2.8-6 (ubuntu based) a directory previously mounted
with gluster-3.7.4 via fuse mount.
The problem is quite simple to reproduce and always repeatable: if a
file has read-only permissions for owner and user wants to copy it,
permissions problem arises:
cdc@client:~$ rm -f kk.txt 444.txt; echo "prueba" > 444.txt; chmod 444
444.txt; cp -p 444.txt kk.txt; ls -ld 444.txt kk.txt
cp: failed to close ‘kk.txt’: Permission denied
-r--r--r-- 1 cdc admincdc 7 nov 3 2015 444.txt
-r--r--r-- 1 cdc admincdc 0 nov 3 2015 kk.txt
cdc@client:~$
If the file permissions are not read-only, there is no problem:
cdc@client:~$ rm -f kk.txt 644.txt; echo "prueba" > 644.txt; chmod 644
644.txt; cp -p 644.txt kk.txt; ls -ld 644.txt kk.txt
-rw-r--r-- 1 cdc admincdc 7 nov 3 2015 644.txt
-rw-r--r-- 1 cdc admincdc 7 nov 3 2015 kk.txt
cdc@client:~$
If we track it down with strace, the problem arises exactly when fsync()
is called from cp.
Of course, if we try this combination of commands in other directories
not mounted by nfs (local ones) or mounted with samba/cifs or even
mounted with nfs-ganesha (both fuse mounted with gluster), this doen't
happen. This problem doesn't happen either if the nfs-kernel-server
exports a directory not mounted with fuse (any local one).
Please, tell me if this is the right place to post the probem and where
is it if this is not. Let me know if we can help you any way to solve or
test it (we've developed a small program in c that shows exactly the
same behaviour).
Thanks again.
Omar
PS: Pointer to this email address came from:
http://wiki.linux-nfs.org/wiki/index.php/Reporting_bugs
ADDITIONAL INFO:
cdc@client:~$ uname -a
Linux l056 3.13.0-63-generic #103-Ubuntu SMP Fri Aug 14 21:43:30 UTC
2015 i686 i686 i686 GNU/Linux
cdc@client:~$
cdc@client:~$ mount | grep home
cuentas02:/home-3/cdc on /home/cdc type nfs
(rw,noatime,intr,fsc,nolock,rsize=262140,wsize=262140,addr=138.4.30.15)
cdc@client:~$
root@server-lab:~# uname -a
Linux cuentas02-lab.lab.dit.upm.es 3.13.0-63-generic #103-Ubuntu SMP Fri
Aug 14 21:42:59 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
root@server-lab:~#
root@server-lab:~# dpkg -l | grep nfs
ii libnfsidmap2:amd64 0.25-5 amd64 NFS
idmapping library
ii nfs-common 1:1.2.8-6ubuntu1.1 amd64 NFS support
files common to client and server
ii nfs-kernel-server 1:1.2.8-6ubuntu1.1 amd64
support for NFS kernel server
root@server-lab:~#
root@server-lab:~# exportfs -v
/home-3
138.4.30.0/23(rw,async,wdelay,insecure,no_root_squash,no_subtree_check,fsid=3,sec=sys,rw,no_root_squash,no_all_squash)
root@server-lab:~#
LOGS ON SERVER SIDE (glusterfs mount logs):
[2015-11-20 10:51:53.872656] I [io-stats.c:1014:io_stats_dump_fd]
0-home-lab-3: --- fd stats ---
[2015-11-20 10:51:53.872692] I [io-stats.c:1019:io_stats_dump_fd]
0-home-lab-3: Filename : /cdc/444.txt
[2015-11-20 10:51:53.872704] I [io-stats.c:1034:io_stats_dump_fd]
0-home-lab-3: BytesWritten : 7 bytes
[2015-11-20 10:51:53.872714] I [io-stats.c:1046:io_stats_dump_fd]
0-home-lab-3: Write 000004b+ : 1
[2015-11-20 10:51:53.874917] W [MSGID: 114031]
[client-rpc-fops.c:1298:client3_3_removexattr_cbk]
0-home-lab-3-client-0: remote operation failed [Permission denied]
[2015-11-20 10:51:53.874976] W [fuse-bridge.c:1230:fuse_err_cbk]
0-glusterfs-fuse: 63459954: REMOVEXATTR() /cdc/444.txt => -1 (Permission
denied)
[2015-11-20 10:51:53.881389] W [MSGID: 114031]
[client-rpc-fops.c:1298:client3_3_removexattr_cbk]
0-home-lab-3-client-3: remote operation failed [Permission denied]
[2015-11-20 10:51:53.881434] W [fuse-bridge.c:1230:fuse_err_cbk]
0-glusterfs-fuse: 63459961: REMOVEXATTR() /cdc/kk.txt => -1 (Permission
denied)
[2015-11-20 10:51:53.883072] W [fuse-bridge.c:1230:fuse_err_cbk]
0-glusterfs-fuse: 63459964: REMOVEXATTR() /cdc/kk.txt => -1 (Permission
denied)
[2015-11-20 10:51:53.883057] W [MSGID: 114031]
[client-rpc-fops.c:1298:client3_3_removexattr_cbk]
0-home-lab-3-client-3: remote operation failed [Permission denied]
[2015-11-20 10:51:53.884003] E [MSGID: 114031]
[client-rpc-fops.c:466:client3_3_open_cbk] 0-home-lab-3-client-3: remote
operation failed. Path: /cdc/kk.txt
(3175e0cd-8308-45b8-a4b0-699f6f8cf37f) [Permission denied]
[2015-11-20 10:51:53.884056] W [fuse-bridge.c:969:fuse_fd_cbk]
0-glusterfs-fuse: 63459965: OPEN() /cdc/kk.txt => -1 (Permission denied)
[2015-11-20 10:51:53.885619] W [MSGID: 114031]
[client-rpc-fops.c:1298:client3_3_removexattr_cbk]
0-home-lab-3-client-3: remote operation failed [Permission denied]
[2015-11-20 10:51:53.885664] W [fuse-bridge.c:1230:fuse_err_cbk]
0-glusterfs-fuse: 63459967: REMOVEXATTR() /cdc/kk.txt => -1 (Permission
denied)
[2015-11-20 10:51:53.887908] W [fuse-bridge.c:1230:fuse_err_cbk]
0-glusterfs-fuse: 63459971: REMOVEXATTR() /cdc/kk.txt => -1 (Permission
denied)
[2015-11-20 10:51:53.887891] W [MSGID: 114031]
[client-rpc-fops.c:1298:client3_3_removexattr_cbk]
0-home-lab-3-client-3: remote operation failed [Permission denied]
(NOTE: We have more gluster brick logs but we don't know if are relevant)
--
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Centro de Cálculo Depto. Ingeniería Sistemas Telemáticos
E-mail: omar@xxxxxxxxxx Universidad Politécnica de Madrid
Fax:(+34) 913367333 E.T.S. Ing. Telecomunicación
Tel:(+34) 915495700-Ext.3005 28040 Madrid (Spain)
Tel:(+34) 915495762-Ext.3005
Tel:(+34) 913367366-Ext.3005
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