[OpenAFS] CoW

[Mike Aldrich]

Hi,
I caught an instance of the CoW bug on Linux 7.1, OpenAFS 1.2.2:

[root@www06 tprender]# ls -la
<files>
[root@www06 tprender]# cp resinctl /afs/.reserveamericax/tools/bin/
[root@www06 tprender]# vos release tools
Could not lock the VLDB entry for the volume 536870918.
VLDB: no permission access for call
Error in vos release command.
VLDB: no permission access for call
[root@www06 tprender]# klog admin
Password:
[root@www06 tprender]# vos release tools
Released volume tools successfully
[root@www06 tprender]# cd /afs/reserveamericax/tools/bin/
[root@www06 bin]# ls
<files>
[root@www06 bin]# ls /afs/.reserveamericax/tools/bin/
<files>
[root@www06 bin]# vos release tools
Released volume tools successfully
[root@www06 bin]# ls
[root@www06 bin]# ls res*
restart
[root@www06 bin]# cd /afs/.reserveamericax/tools/bin/
[root@www06 bin]# ls
<files>
[root@www06 bin]# ls -la
<files>
[root@www06 bin]# chown bin.root resinctl
[root@www06 bin]# ls -la
[root@www06 bin]# vos release tools
Released volume tools successfully
[root@www06 bin]# klog admin
Password:
[root@www06 bin]# ls
<files>
[root@www06 bin]# rm resinctl
rm: remove `resinctl'? y
rm: cannot unlink `resinctl': Input/output error
[root@www06 bin]# pwd
/afs/.reserveamericax/tools/bin
[root@www06 bin]# ls -la
[root@www06 bin]# mv resinctl resin2.ctl
ls -la
mv: cannot move `resinctl' to `resin2.ctl': No such device
[root@www06 bin]# ls -la
ls: .: Connection timed out
[root@www06 bin]# ls
ls: .: Connection timed out
[root@www06 bin]# ls
ls: .: Connection timed out
[root@www06 bin]# ls
ls: .: Connection timed out
[root@www06 bin]#

This was done on a client machine (all running same version of AFS/Linux)=
=2E

=46rom the server logs:

[root@afsp logs]# grep Copy* *
FileLog.old:Fri Aug  9 10:56:42 2002 CopyOnWrite failed: volume 536870918=
 in=20
partition /vicepa  (tried reading 2048, read 0, wrote 0, errno 4) volume=20
needs salvage
[root@afsp logs]#

I salvaged the volume and was able to grab the files located in my 'lost'=
=20
directory from another client machine.

Thanks!
Mike