From mboxrd@z Thu Jan  1 00:00:00 1970
From: hooanon05@yahoo.co.jp
Subject: Re: [RFC PATCH 0/2] Union Mount: Directory listing in glibc
Date: Thu, 01 May 2008 10:39:14 +0900
Message-ID: <7096.1209605954@jrobl>
References: Your message of "Wed, 30 Apr 2008 11:37:10 +0530." <c810d5090804292307y2884b169t5c27b50fb7c94c30@mail.gmail.com> <200804301635.m3UGZ7gn006259@agora.fsl.cs.sunysb.edu>
Cc: "NAGABHUSHAN BS" <bsn.0007@gmail.com>, libc-alpha@sourceware.org,
	"Jan Blunck" <jblunck@suse.de>, 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>,
	"Trond Myklebust" <trond.myklebust@fys.uio.no>,
	bharata@linux.vnet.ibm.com, "David Woodhouse" <dwmw2@infradead.org>
To: Erez Zadok <ezk@cs.sunysb.edu>
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Erez Zadok:
> Here's one idea:
> 
> 1. Your main data structure is a linear array of struct dirents.  You
	:::

All these points are very similar to the actual implementation in AUFS,
except 'Optimization 2: decide memory size by stat().'
- the size may not be enough for storing every dirent, it depends upon
  the filesystem's implementation.
- the size may be a block size which can be larger than page size even
  if it is a empty dir, also it depends upon the filesystem.


Junjiro Okajima