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Date:	Wed, 11 Nov 2009 02:42:39 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...IV.linux.org.uk>, mingo@...e.hu,
	Frederic Weisbecker <fweisbec@...il.com>,
	auke-jan.h.kok@...el.com
Subject: Re: [PATCH] vfs: Add a trace point in the mark_inode_dirty function

On 11/11/2009 01:34 AM, Arjan van de Ven wrote:
> Wu Fengguang<fengguang.wu@...el.com>  wrote:
>> Maybe this is enough for POWERTOP, however for general use, the dirty
>> type(data/metadata) and inode number may be valuable to some users?
>
> what can a user do with an inode number????

Inode numbers have always been visible to userspace...  IIRC, tar(1) 
uses the st_ino member of struct stat to detect hard links in certain 
cases.  ls(1) displays inode numbers with -i, find(1) looks for them 
with -inum, ...

	Jeff


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