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Re: [RFC PATCH 1/2] Union Mount: glibc readdir support
- From: Bharata B Rao <bharata at linux dot vnet dot ibm dot com>
- To: Ulrich Drepper <drepper at redhat dot com>
- Cc: bsn dot 0007 at gmail dot com, libc-alpha at sourceware dot org, Jan Blunck <jblunck at suse dot de>, Erez Zadok <ezk at cs dot sunysb dot edu>, linux-kernel at vger dot kernel dot org, linux-fsdevel at vger dot kernel dot org, viro at zeniv dot linux dot org dot uk, Christoph Hellwig <hch at lst dot de>, Mingming Cao <cmm at us dot ibm dot com>, Dave Hansen <haveblue at us dot ibm dot com>, Trond Myklebust <trond dot myklebust at fys dot uio dot no>, David Woodhouse <dwmw2 at infradead dot org>
- Date: Tue, 6 May 2008 09:51:17 +0530
- Subject: Re: [RFC PATCH 1/2] Union Mount: glibc readdir support
- References: <20080429133201.GA9938@localhost.localdomain> <20080429133346.GB9938@localhost.localdomain> <48195E69.3030701@redhat.com>
- Reply-to: bharata at linux dot vnet dot ibm dot com
On Wed, Apr 30, 2008 at 11:08:41PM -0700, Ulrich Drepper wrote:
>
> Before anything further is discussed I need to know how you expect to
> handle NFS? I don't see how, with a userlevel readdir implementation,
> you can support NFS.
At the client side, I don't see a problem with unioning NFS with other
FS. Kernel would still return all dirents of the union including those
from NFS and glibc readdir would be able to handle them appropriately.
Or am I missing something ?
At the server side, I can't see how NFS server could export a union.
I don't see how this could be sanely done with Union Mount. Erez, how
does Unionfs handle this ?
Is dis-allowing NFS-exporting of unions an option ?
Regards,
Bharata.