Date: Sun, 26 Jan 2003 16:42:10 -0800
From: David Ashley <dash@xdr.com>
Message-Id: <200301270042.h0R0gAd00829@dave.home>
To: aebr@win.tue.nl
Subject: Re: Serious filesystem bug in linux [nevermind]
Cc: linux-kernel@vger.kernel.org
Sender: linux-kernel-owner@vger.kernel.org

>On Sun, Jan 26, 2003 at 03:18:49PM -0800, David Ashley wrote:
>
>> -rw-r--r--    1 root     root     1965107636224 Jan 26 14:59 output1.iso
>
>You know about the Unix concept of files with holes?

No, but I can look into it. There is definitely some bug in my program
but I wouldn't expect this behaviour. So if I seek way the hell out
to nowhere, do a write, I'll have a file of the total amount I've skipped
over?

I just wrote a test program and it did exactly this. Thanks!

Here is the program
#define _LARGEFILE64_SOURCE
#include <fcntl.h>
#include <unistd.h>

main()
{
int fd;
char buff[32];
	fd=open("/tmp/crazybigfile",O_RDWR|O_CREAT|O_TRUNC|O_LARGEFILE,0644);
	lseek64(fd,1000000000000ll,SEEK_SET);
	write(fd,buff,32);
	close(fd);

}

Live and learn. Sorry for the alarm!

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