linux-ext4 - Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]

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Message-ID: <20100722171224.GA8630@merit.edu>
Date:	Thu, 22 Jul 2010 13:12:24 -0400
From:	Jim Rees <rees@...ch.edu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeremy Allison <jra@...ba.org>, Volker.Lendecke@...net.de,
	David Howells <dhowells@...hat.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make
 extended file stats available [ver #6]

Linus Torvalds wrote:

  I personally think that Unix ctime is insane. There is no real reason
  why "write()" should change mtime, but "chmod" changes ctime. It was
  just a random decision way back when...

I believe it was done that way so "dump" could backup just the inode and not
the data if only the inode had changed.  Full history here:

http://blog.plover.com/Unix/ctime.html
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