[Gluster-devel] regressions due to 64-bit ext4 directory cookies

[Anand Avati]

On Wed, Feb 13, 2013 at 3:44 PM, Theodore Ts'o <tytso at mit.edu> wrote:
>
> I suspect this would seriously screw over Gluster, though, and this
> wouldn't be a solution for NFSv3, since NFS needs long-lived directory
> cookies, and not the short-lived cookies which is all POSIX/SuSv3
> guarantees.
>

Actually this would work just fine with Gluster. Except in the case of
gluster-NFS, the native client is only acting like a router/proxy of
syscalls to the backend system. A directory opened by an application will
have a matching directory fd opened on ext4, and readdir from an app will
be translated into readdir on the matching fd on ext4. So the
app-on-glusterfs and glusterfsd-on-ext4 are essentially "moving in tandem".
As long as the offs^H^H^H^H cookies do not overflow in the transformation,
Gluster would not have a problem.

However Gluster-NFS (and NFS in general, too) will break, as we
opendir/closedir potentially on every request.

Avati
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