linux-kernel - Re: [RFC PATCH 0/2] Union Mount: Directory listing in glibc

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Message-ID: <7096.1209605954@jrobl>
Date:	Thu, 01 May 2008 10:39:14 +0900
From:	hooanon05@...oo.co.jp
To:	Erez Zadok <ezk@...sunysb.edu>
Cc:	"NAGABHUSHAN BS" <bsn.0007@...il.com>, libc-alpha@...rceware.org,
	"Jan Blunck" <jblunck@...e.de>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	"Christoph Hellwig" <hch@....de>,
	"Ulrich Drepper" <drepper@...hat.com>,
	"Mingming Cao" <cmm@...ibm.com>,
	"Dave Hansen" <haveblue@...ibm.com>,
	"Trond Myklebust" <trond.myklebust@....uio.no>,
	bharata@...ux.vnet.ibm.com, "David Woodhouse" <dwmw2@...radead.org>
Subject: Re: [RFC PATCH 0/2] Union Mount: Directory listing in glibc 


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
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