linux-kernel - Re: [RFC] Union Mount: Readdir approaches

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Date:	Mon, 10 Sep 2007 11:16:43 +0900
From:	hooanon05@...oo.co.jp
To:	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>
Cc:	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	hch@...radead.org, Jan Blunck <jblunck@...e.de>
Subject: Re: [RFC] Union Mount: Readdir approaches 


Hello Jeff,

"Josef 'Jeff' Sipek":
> Unless I missunderstood something, Unionfs uses the same approach. Even
> Unionfs's ODF branch does the same thing. The major difference is that we
> keep the cache in a file on a disk.

The approach unionfs-2.1.2 took differs from mine.
Major difference is,
- in this approach, the cache in struct file is the completed virtual
  disk block for the dir.
- readdir doesn't have to call vfs_readdir when the cache exists and is
  valid. simply calls filldir.
- it supports SEEK_END.


Junjiro Okajima
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