linux-kernel - Re: [PATCH] vfs: Add a trace point in the mark_inode

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Date:	Wed, 11 Nov 2009 02:56:29 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Arjan van de Ven <arjan@...radead.org>,
	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>,
	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 02:45 AM, Ingo Molnar wrote:
>
> * Jeff Garzik<jeff@...zik.org>  wrote:
>
>> 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, ...
>
> Without an inode->vfs-name lookup/matching service it's of limited
> utility

Look in the quoted text for one such service...  :)

	Jeff


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