linux-kernel - Re: [PATCH v2] d_ino considered harmful

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Message-ID: <30568.1276797848@jrobl>
Date:	Fri, 18 Jun 2010 03:04:08 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	David Dillow <dillowda@...l.gov>
Cc:	Valerie Aurora <vaurora@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Jan Blunck <jblunck@...e.de>,
	Jamie Lokier <jamie@...reable.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Andreas Dilger <adilger@....com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2] d_ino considered harmful


David Dillow:
> For example, our main Lustre scratch space has over 285 million files in
> it, and using find -inum takes over 72 hours to walk the tree using
	:::
> Using ne2scan -- which uses libext2fs and combines the inode scan and
> the name lookup -- takes over 48 hours to generate a list of candidate
> files for the purge example. With an optimized inode scan and the custom
	:::

While I've never heard of ne2scan, I am interested in this simplified
problem such as "find the pathname(s) from an inum in a huge fs."
Is ne2scan essentially equivalent to "debugfs ncheck inum"?

About Valeris's patch, as long as "ls -i" is useful/helpful,
> +	/* Use of d_ino without st_dev is always buggy. */
is not true.


J. R. Okajima

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