Bill Arlofski
2005-Mar-09 00:02 UTC
[Samba] AutoCad 2004, Samba 3.0.11 & file locking issues
Sorry for such a long post as my first to the list, but in an effort to forego a long back and forth question/answer session via email, I think if I post all the information that I currently have someone may be able to more quickly spot my issue. The server in question is a Gentoo server running Samba 3.0.11. The basic problem is that when person A opens an AutoCad file, person B is unable to open the file and is told (by an Autocad dialog box): "Cannot find the scpcified drawing file. Please verify that the network drive is available and the file exists" Now, this Samba server replaced an NT 4 server and the client says that in the past, when ever person b tried to open an already opened Autocad file, they would be allowed to open it in Read-only mode, which is exactly what they expect and want to happen. So, on to the troubleshooting: I had my client open an AutoCad file called A1_1 and here is what tdbdump showed for that file. (info on the .dwl file is further below) # tdbdump /var/cache/samba/locking.tdb | grep A1_1 data = "\01\00\00\004[3@set_kernel_oplock: got kernel oplock\AAa\00\00\07\9D\03\00!\00\00\00\96\01\02\00\B6\80,B\C9\A9\03\00\03\08\00\00\00\00\00\00\85\D6\0F\00\00\00\00\00\AF;\00\00/home/shared/projects/A1_1.dwl\00" data = "\01\00\00\00\DCY3@set_kernel_oplock: got kernel oplock\AAa\00\00\00\00\00\00\22\00\00\00\9F\01\02\00\B4\80,B\FF\E7\09\00\03\08\00\00\00\00\00\00\B3\B3\0A\00\00\00\00\00\1E;\00\00/home/shared/projects/A1_1.dwg\00" smbstatus shows: louis 25002 louis_laptop Mon Mar 7 08:25:49 2005 25002 DENY_WRITE 0x20196 WRONLY EXCLUSIVE+BATCH /home/shared/projects/A1_1.dwl MonMar 7 10:55:55 2005 25002 DENY_WRITE 0x2019f RDWR NONE /home/shared/projects/A1_1.dwg MonMar 7 10:55:53 2005 lsof -p 25002 | grep A1_1 shows: smbd 25002 louis 27uR REG 8,3 110753 701363 /home/shared/projects/A1_1.dwg smbd 25002 louis 61wR REG 8,3 52 1037957 /home/shared/projects/A1_1.dwl The .dwl file is a 'log file' that AutoCad uses to inform others that the file is opened and who it is opened by. Here are it's contents: louis LOUIS_LAPTOP Monday, March 07, 2005 11:02:28 AM If this user, Louis, tries to open this file again, Autocad tells him that "louis has this file open, would you like to open it as a read only file?" This is the correct functionality. This is how it's supposed to work when other network users attempt to open an AutoCad file that someone already had opened. And this is how it used to work on their NT Server. Instead, on the Samba server, when someone else on the network using AutoCad attempts to open that file, they get an error dialog of the nature "Cannot find the specified drawing file. Please verify that the network drive is available and the file exists" In another test, using Explorer, Louis was able to copy to his desktop an AutoCad drawing that was already in use by another user. I was initially thinking that we could over-ride samba's locking mechanisms for that share or something, but when he was able to copy an in-use file it started to look like an Autocad-specific issue rather than a Linux/Samba file locking issue. Any ideas that anyone can offer to help solve this would be appreciated. If this is strictly an AutoCad issue, I'd like to know for sure before we go to AutoCad with an issue. And again, if it is an AutoCad issue, why did everything work as expected on the NT server? Was NT ignoring AutoCad's file locking requests? Thanks again! - Bill Arlofski waa-samba@revpol.com
Gerald (Jerry) Carter
2005-Mar-12 15:00 UTC
[Samba] AutoCad 2004, Samba 3.0.11 & file locking issues
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Bill Arlofski wrote: | | Sorry for such a long post as my first to the list, but in an effort to | forego a long back and forth question/answer session via email, I think | if I post all the information that I currently have someone may be able | to more quickly spot my issue. | | The server in question is a Gentoo server running Samba 3.0.11. | | The basic problem is that when person A opens an AutoCad file, person B | is unable to open the file and is told (by an Autocad dialog box): | | "Cannot find the scpcified drawing file. Please verify that the network | drive is available and the file exists" | | Now, this Samba server replaced an NT 4 server and the client says that | in the past, when ever person b tried to open an already opened Autocad | file, they would be allowed to open it in Read-only mode, which is | exactly what they expect and want to happen. I think we actually need a raw network trace (tcpdump -w /tmp/dump.pcap -s 0 -i eth0 host <client ip>) and a level 10 smbd debug log You might want to test 3.0.12rc1 since jeremy just fixed an issue with pending modtimes that fixed issues with excel. cheers, jerry ====================================================================Alleviating the pain of Windows(tm) ------- http://www.samba.org GnuPG Key ----- http://www.plainjoe.org/gpg_public.asc "I never saved anything for the swim back." Ethan Hawk in Gattaca -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCMwP1IR7qMdg1EfYRAuljAJ4yBn8aj6jg2a289fvY0m46nxTOEgCfUm6u Pw/p55mI4uT7rgaZRJ+MzEk=kTMI -----END PGP SIGNATURE-----