On Tue, 2004-04-27 at 11:58, Brennaman, Molly Ms NSC wrote: > To Whom it May Concern: > I found this addresss on a website. I am a Linux novice with a > big job at hand. We are converting from VAX VMS to Linux and are > transferring files to a server. We have multiple users accessing > files on the server. How can we ensure that when A opens a file, that > A has a write-lock on the file so if B opens the same file - B only > has read access until A closes the file??? Any assistance would be > greatly appreciated. > > Molly First, this is a list for the logical volume manager in Linux, so you're probably asking this in the wrong place. You might try a more general red hat users forum or something. Most Linux filesystems, however, allow for advisory locking through the fcntl() system call. Advisory locks are like stoplights -- they only work if all programs respect them. You haven't said anything about how your users are accessing files, so it's tough to know whether the programs you're using respect (and set) fcntl locks (however most well written programs do). Some linux filesystems allow you to mount them with a -o mand option, which will enforce manditory locking. In any case, your software needs to set the correct flags to lock the files when opening them. See the fcntl(2) manpage for more info, and check the source code of your software (or check with the vendor) to find out whether it does fcntl locks. Hope this helps, Jeff _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
