Subj : CVS commit src/sbbs3/nope
To   : Deuce
From : Digital Man
Date : Mon Dec 27 2004 02:05 am

  Re: CVS commit src/sbbs3/nope
  By: Deuce to Digital Man on Sun Dec 26 2004 10:23 pm

 >   Re: CVS commit src/sbbs3/nope
 >   By: Digital Man to Deuce on Sun Dec 26 2004 02:58:00
 > 
 >  > Well SMB/CIFS has standardized, cross-platform, file and record locking, 
 >  > should (obviously) be supported by all smb/cifs clients and servers (e.g.
 >  > smbfs), regardless of the OS on which they're hosted.
 > 
 > Right... but for a *nix system to map calls to say lockf() to SMB/CIFS calls
 > it's just not possible because the lock semantics are different.  If for
 > example, you want an exclusive record lock in *nix, you MUST open with write
 > intent plus some other semantic weirdness... what I'm suggesting is that
 > although SMB/CIFS supports specific file/record locking, *nix itself does no
 > so you'd either need to use some platform-specific SMB/CIFS library in the
 > program or handle the SMB/CIFS stuff yourself to get correct bahaviour.

I'm not sure how to respond, because it does work on smbfs-Linux (when it's not
locking up).

 > Possibly the call deadlock response is caused by the fact that our lock()
 > implementation uses both flock() and fcntl() locks.  Not sure, I'd have to
 > experiment (after the holidays unfortunately)

I don't remember how we go onto this debate, but the fact remains that
cross-platform file and record locking has to be supported for mixed-OS
(Windows and *nix) Synchronet installations, and smbfs and cifs both supposedly
do this. My tests (when they work) confirm that files opened with
deny-all/write access on Win32 or records locked on Win32 cannot be
opened/read/written on smbfs-Linux and vice versa. If it didn't work, I'd get
data corruption. That has never been the problem with smbfs-Linux, just
system lock-ups. You seem to be insisting that this is impossible. If that's
the case then I should just give up now. :-(

                                                  digital man

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