From: Rogier Wolff <R.E.Wolff@BitWizard.nl>
To: Oleg Drokin <green@namesys.com>
Cc: Rogier Wolff <R.E.Wolff@BitWizard.nl>,
Hans Reiser <reiser@namesys.com>,
linux-kernel@vger.kernel.org, Nikita Danilov <god@namesys.com>
Subject: Re: First impressions of reiserfs4
Date: Mon, 8 Sep 2003 10:56:41 +0200 [thread overview]
Message-ID: <20030908105639.B26722@bitwizard.nl> (raw)
In-Reply-To: <20030908081206.GA17718@namesys.com>
On Mon, Sep 08, 2003 at 12:12:06PM +0400, Oleg Drokin wrote:
> Hello!
>
> On Sun, Aug 31, 2003 at 07:14:19PM +0200, Rogier Wolff wrote:
>
> > Would it be possible to do something like: "pretend that there
> > are always 100 million inodes free", and then report sensible
> > numbers to "df -i"?
>
> This won't work. No sensible numbers would be there.
>
> > There is no installation program that will fail with: "Sorry,
> > you only have 100 million inodes free, this program will need
> > 132 million after installation", and it allows me a quick way
> > of counting the number of actual files on the disk....
>
> You cannot. statfs(2) only exports "Total number of inodes on disk" and
> "number of free inodes on disk" values for fs. df substracts one from another one
> to get "number of inodes in use".
So, you report "oids_in_use + 100M" as total and "100M" as free inodes
on disk. Voila!
We're using a Unix operating system which has a bunch of standard
interfaces. The fun about using those is that lots of stuff "just works"
even if it wasn't designed to do exactly what you are doing right
now. So even if "df" wasn't designed to work on NFS, it still works.
But now we're going to get a new "df" which grabs the sysfs info and
uses that. But it won't work on reiserfs5, as the interface changes
again.
Roger.
--
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
**** "Linux is like a wigwam - no windows, no gates, apache inside!" ****
next prev parent reply other threads:[~2003-09-08 8:56 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-30 11:33 First impressions of reiserfs4 Erik Hensema
2003-08-30 17:06 ` Hans Reiser
2003-08-31 17:14 ` Rogier Wolff
2003-09-08 8:12 ` Oleg Drokin
2003-09-08 8:56 ` Rogier Wolff [this message]
2003-09-08 9:08 ` Oleg Drokin
2003-09-08 9:33 ` Rogier Wolff
2003-09-08 9:48 ` Oleg Drokin
2003-09-08 10:05 ` Rogier Wolff
2003-09-08 10:17 ` Oleg Drokin
2003-09-08 12:59 ` Herbert Poetzl
2003-09-08 22:24 ` Mike Fedyk
2003-09-09 7:04 ` Oleg Drokin
2003-09-09 19:10 ` Mike Fedyk
2003-09-11 10:29 ` Oleg Drokin
2003-09-11 17:15 ` Reiser3/4 & Ext2/3 was: " Mike Fedyk
2003-09-11 17:27 ` Oleg Drokin
2003-09-11 22:50 ` Rogier Wolff
2003-09-12 1:20 ` Bernd Eckenfels
2003-09-12 4:48 ` Mike Fedyk
2003-10-01 21:06 ` Bernd Eckenfels
2003-10-02 6:36 ` Hans Reiser
2003-09-12 1:17 ` Bernd Eckenfels
2003-09-08 20:11 ` Andreas Dilger
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