From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hans Reiser <reiser@namesys.com>
Subject: Re: Possible bug with FIBMAP
Date: Sun, 27 Aug 2006 23:33:05 -0700
Message-ID: <44F28E21.6000801@namesys.com>
References: <200608271057.12684.un_brice@vleu.net>
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To: Brice Arnould <un_brice@vleu.net>
Cc: reiserfs-list@namesys.com, reiserfs-dev <reiserfs-dev@namesys.com>, Alexander Zarochentcev <zam@namesys.com>

zam, please review this unless vs is back.

What is the file size?  Is there anything special about the file (holes,
etc.)?

Thanks for finding what I assume is a bug.  (I wonder if this has been
sporadically affecting use of reiser4 with bootloaders.....)

Hans

Brice Arnould wrote:
> Hi
>
> Two users of a hack I wrote told me that
> http://vleu.net/shake/fb_r4.c (also attached with the mail)
> returned "FIBMAP=-22, FIGETBSZ=4096"
> on some of their files on reiser4 filesystems.
>
> Does this value of "-22" have a special meaning (would be strange), or is it a 
> bug in Reiser4 ?
> I can ask them for more details, if you want.
>
> Thanks
> Brice
>   
> ------------------------------------------------------------------------
>
> /*
>  * Non released test software, distributed under GPL-2 licence by
>  * Brice Arnould (c) 2006
>  * You shouldn't use it.
>  */
> #include <stdio.h>
> #include <assert.h>		// assert()
> #include <errno.h>		// errno
> #include <error.h>		// error()
> #include <sys/ioctl.h>		// ioctl()
> #include <linux/fs.h>		// FIBMAP, FIGETBSZ
> #include <sys/types.h>		// open()
> #include <sys/stat.h>		// open()
> #include <fcntl.h>		// open()
>
> int
> main (int argc, char **argv)
> {
>   int fd, blocksize, block = 0;
>   if (1 != argc)
>     error (1, 0, "usage : %s FILE", argv[0]);
>   fd = open (argv[1], O_RDONLY);
>   assert (0 < fd);
>   if (-1 == ioctl (fd, FIGETBSZ, &blocksize)
>       || -1 == ioctl (fd, FIBMAP, &block))
>     error (1, 0, "ioctl() failed, are you root ?\n");
>   printf ("FIBMAP=%i, FIGETBSZ=%i\n", block, blocksize);
>   close (fd);
> }
>