linux-ext4 - Re: [RFC][PATCH 0/3] ext4 online defrag (ver 0.2)

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Message-ID: <20070119113351.GM5236@schatzie.adilger.int>
Date:	Fri, 19 Jan 2007 04:33:51 -0700
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Takashi Sato <sho@...s.nec.co.jp>
Cc:	Joel Becker <Joel.Becker@...cle.com>, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC][PATCH 0/3] ext4 online defrag (ver 0.2)

On Jan 19, 2007  14:19 +0900, Takashi Sato wrote:
> >>On Jan 16, 2007  21:03 +0900, sho@...s.nec.co.jp wrote:
> >>>1. Add new ioctl(EXT4_IOC_DEFRAG) which returns the first physical
> >>>   block number of the specified file.  With this ioctl, a command
> >>>   gets the specified directory's.
> >>
> >>Maybe I don't understand, but how is this different from the long-time
> >>FIBMAP ioctl?
> >
> >I can use FIBMAP instead of my new ioctl.
> >You are right.  I should have used FIBMAP ioctl...
> 
> I have to get the physical block number of the specified directory.
> But FIBMAP is available only for a regular file, not for a directory.
> So I will use my new ioctl.

Though it might make sense to implement FIBMAP for a directory, to keep
it consistent and allow user-space tools like "filefrag" to work on
directories also.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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