Re: squashfs size in statfs

[H. Peter Anvin]

Phillip Lougher wrote:
> > >
> > Yes, because CRAM does it that way, and maybe zisofs does it too:
>
> Zisofs doesn't (H. Peter Anvin should know as he wrote it :-) ).
>
> root@pierrot:/# ls -la dir.iso
> -rw-r--r--  1 root root 366592 2006-06-16 22:41 dir.iso
> root@pierrot:/# mount -t iso9660 dir.iso /mnt -o loop
> root@pierrot:/# df /mnt
> Filesystem           1K-blocks      Used Available Use% Mounted on
> /dir.iso                   358       358         0 100% /mnt
> root@pierrot:/# ls -la /mnt
> total 13
> drwxr-xr-x   2 root root     2048 2006-06-16 22:41 .
> drwxr-xr-x  32 root root     4096 2006-06-16 22:56 ..
> -rw-r--r--   1 root root 51200000 2006-06-16 22:40 zero
>
> Statfs should return the size of the filesystem, not the amount of
> data the filesystem  represents.  In this respect the behaviour of
> Squashfs and Zisofs is correct.
>
> This is analogous to performing stat on a gzipped file.  The stat
> returns the size of the compressed file, not the uncompressed size.

A better analogy is it is like statting a sparse file on, say, an ext3 filesystem.  stat 
(ls -s) and statfs report the amount of storage consumed.

	-hpa

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/