'holey files' not holey enough.

From: Adam (adam@cfar.umd.edu)
Date: Wed Nov 29 2000 - 08:00:19 EST

Is this feature or bug?

First a test on 'stable' 2.2.x kernel:

        eax /tmp % uname -a
        Linux eax 2.2.17pre15 #1 Sat Aug 5 14:31:19 EDT 2000 i586 unknown

        eax /tmp % dd if=/dev/zero of=holed.file bs=1000 seek=5000 count=1000
        1000+0 records in
        1000+0 records out

        eax /tmp % ls -l holed.file
        -rw-rw-r-- 1 adam adam 6000000 Nov 29 08:57 holed.file

        eax /tmp % du -sh holed.file
        983k holed.file

Above holey file is as expected aproximately 1mb.
However, when I try on 'development' 2.4.x kernel

        [adam@pepsi /tmp]$ uname -a
        Linux pepsi 2.4.0-test7-packet #24 SMP Fri Sep 8 20:26:35 EDT 2000 i686

        [adam@pepsi /tmp]$ dd if=/dev/zero of=holed.file bs=1000 seek=5000 count=1000
        1000+0 records in
        1000+0 records out

        [adam@pepsi /tmp]$ ls -l holed.file
        -rw-rw-r-- 1 adam adam 6000000 Nov 29 08:52 holed.file

        [adam@pepsi /tmp]$ du -sh holed.file
        1.9M holed.file

The holey file is twice as big,

at almost 2mb instead of expected 1mb. 

-- 
Adam
http://www.eax.com	The Supreme Headquarters of the 32 bit registers

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