From: Bharata B Rao <bharata@linux.vnet.ibm.com>
To: Roland McGrath <roland@redhat.com>
Cc: libc-alpha@sourceware.org, Jan Blunck <jblunck@suse.de>,
Erez Zadok <ezk@cs.sunysb.edu>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
viro@zeniv.linux.org.uk, Christoph Hellwig <hch@lst.de>,
Ulrich Drepper <drepper@redhat.com>,
Mingming Cao <cmm@us.ibm.com>, Dave Hansen <haveblue@us.ibm.com>
Subject: Re: [RFC] Union mount readdir support in glibc
Date: Wed, 12 Mar 2008 09:58:58 +0530 [thread overview]
Message-ID: <20080312042858.GB16709@in.ibm.com> (raw)
In-Reply-To: <20080311080929.B076D26F991@magilla.localdomain>
On Tue, Mar 11, 2008 at 01:09:29AM -0700, Roland McGrath wrote:
>
> This really is the kernel filesystem's problem. It just doesn't make sense
> to expect userland to implement half of your directory semantics for you.
I agree that we are asking glibc to handle part of the union mount
semantics in readdir. But we have tried handling directory listing of
union entirely inside the kernel, but the results haven't been so good.
(http://lkml.org/lkml/2007/12/5/147). Recently Al Viro suggested that we
do this in the userland and he felt that is the only sane way of doing this.
Infact I had mentioned about this approach to Ulrich briefly during
FOSS.IN and he sounded positive to the idea of maintaining a dirent
cache for duplicate elimination as long as it doesn't slowdown normal
users.
Regards,
Bharata.
next prev parent reply other threads:[~2008-03-12 4:29 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-11 5:55 Bharata B Rao
2008-03-11 8:09 ` Roland McGrath
2008-03-11 12:49 ` Bharata B Rao
2008-03-12 4:28 ` Bharata B Rao [this message]
2008-03-14 3:53 ` Ulrich Drepper
2008-03-14 5:39 ` Al Viro
2008-03-14 7:13 ` Ulrich Drepper
2008-03-14 8:41 ` Miklos Szeredi
2008-03-14 17:53 ` Peter Staubach
2008-03-14 20:51 ` Miklos Szeredi
2008-03-14 20:58 ` Trond Myklebust
2008-03-14 15:07 ` Jan Blunck
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