Re: 'holey files' not holey enough.

From: Marc Mutz (Marc@Mutz.com)
Date: Fri Dec 01 2000 - 09:13:10 EST

Andreas Dilger wrote:
>
> Marc Mutz writes:
> > kernel 2.2.17, '/' being a 1k blocksize ext2fs:
> >
> > root@adam:/ > dd if=/dev/zero of=holed.file bs=1000 seek=5000 count=1000
> > 1000+0 records in
> > 1000+0 records out
> > root@adam:/ > ls -l holed.file
> > -rw-r--r-- 1 root root 6000000 Nov 29 23:33 holed.file
> > root@adam:/ > du -sh holed.file
> > 5.7M holed.file
>
> Strangely, I have 2.2.17 (TurboLinux patched), on a 1k filesystem and
> I have no problems. I have 1k, 2k, and 4k ext2 fs, all OK.
>
> What people who have the problem should be doing is:
> > ls -li holed.file # find inode number
> 10732 -rw-r--r-- 1 root root 6000000 Nov 29 16:17 holed.file
> > du -sk holed.file # see what "stat" thinks
> 983k holed.file

dito

> > debugfs /dev/XXX
> debugfs> stats # find out ext2 block size
> ...
> Block size = 1024, fragment size = 1024
> ...

dito

> Links: 1 Blockcount: 1966

dito

> TOTAL: 983

dito

> If what debugfs says doesn't match du, then it is du/libc/stat that is
> broken. If debugfs says the file actually has 6000000 bytes of data,
> then it is the filesystem that is broken.
>
$ du --version
du (GNU fileutils) 3.16
$ ls -l /lib/libc*
lrwxrwxrwx 1 root root 13 May 8 1999 /lib/libc.so.4 \
-> libc.so.4.7.6
-rwxr-xr-x 1 root root 634880 Apr 29 1996
/lib/libc.so.4.7.6
-rwxr-xr-x 1 root root 2478585 Dec 14 1998 /lib/libc.so.6
-rwxr-xr-x 1 root root 85699 Dec 14 1998
/lib/libcrypt.so.1
$ ldd /usr/bin/du
        libc.so.6 => /lib/libc.so.6 (0x40009000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)

all from SuSE 6.0 (I know, it's old...)

Marc 

-- 
Marc Mutz <Marc@Mutz.com>     http://EncryptionHOWTO.sourceforge.net/
University of Bielefeld, Dep. of Mathematics / Dep. of Physics

PGP-keyID's:   0xd46ce9ab (RSA), 0x7ae55b9e (DSS/DH)

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