linux-kernel - 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: <alpine.LSU.2.01.1007221228260.6115@obet.zrqbmnf.qr>
Date:	Thu, 22 Jul 2010 12:35:03 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	David Howells <dhowells@...hat.com>
cc:	viro@...IV.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org, samba-technical@...ts.samba.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]


On Thursday 2010-07-15 04:17, David Howells wrote:
> (6) BSD stat compatibility: Including more fields from the BSD stat such as
>     creation time (st_btime) and inode generation number (st_gen) [Jeremy
>     Allison, Bernd Schubert].
>where st_btime is the file creation time, st_gen is the inode generation
>(i_generation), st_data_version is the data version number (i_version),
>st_inode_flags is the flags from FS_IOC_GETFLAGS plus some extras,
>request_mask and st_result_mask are bitmasks of data desired/provided and
>st_extra_results[] is where as-yet undefined fields are appended.

Linux already has a creation time field, it's called otime (there is no "b" in
"creation"), and you will find scattered fragments of that all over the kernel
(foremost, fs/jfs/, now btrfs, and I also notice sysvipc having something with
that name).

>	struct xstat_time {
>		unsigned long long	tv_sec, tv_nsec;
>	};

If it helps getting rid of the ugly suseconds_t in userspace ;-)
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