linux-kernel - Re: [PATCH] Add a pair of system calls to make extended file stats available [ver #3]

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Date:	Fri, 2 Jul 2010 09:49:52 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Michael Kerrisk <mtk.manpages@...il.com>
Cc:	David Howells <dhowells@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-ext4@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH] Add a pair of system calls to make extended file stats available [ver #3]

On 2010-07-01, at 23:36, Michael Kerrisk wrote:
> * Include information from the "inode_info" structure, most notably
> i_flags, but perhaps other info as well.

This one is actually pretty interesting, though instead of exporting the i_flags directly (the S_* flags), it would be much better to export the FS_*_FL values.  The FS_*_FL values (e.g. FS_IMMUTABLE_FL) are already exposed to userspace via FS_IOC_{GET,SET}FLAGS and are stored on disk in ext2/3/4, so are guaranteed never to change.  The S_* flags DO in fact change between kernel releases.

Cheers, Andreas

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