Re: Possible bug with FIBMAP

[Hans Reiser <reiser@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);
> }
>