(moving to gluster-devel) To write a safe and generically portable program, it would be good to not depend on telldir/seekdir cookie stability. However gluster takes special pain to provide cookies with safe transformation to keep telldir/seekdir cookies stable across closedir/opendir and even across server and client reboots. Most disk filesystems provide stable seekdir/telldir (maybe not all). I don't think NFS client gives stable cookies to applications (though it expects stable cookies from the server). However in the case of FUSE glusterfs + backend XFS or ext4, you do get stable cookies.
Avati On Sat, Apr 27, 2013 at 1:47 PM, Brian Candler <[email protected]> wrote: > On Fri, Apr 26, 2013 at 03:10:03PM -0700, Anand Avati wrote: > > You can do it just like any other filesystem (not specific to either > > FUSE or gluster) - getdents()/readdir() a small bunch, either retain > > the open file descriptor or remember the output of telldir() > > "Values returned by telldir() are good only for > the lifetime of the DIR pointer (e.g., dirp) from which they are > derived. > If the directory is closed and then reopened, prior values returned by > telldir() will no longer be valid." > > (OSX/BSD manpage) > > So you have to keep the open file descriptor anyway. >
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