Hello Justin,
Justin Schoeman wrote:
>
> Eugene Kuznetsov wrote:
> >
> > Hello Justin,
> >
[...]
> > JS> 2) How do I get my files longer than 4GB? For some reason I cannot seem
> > JS> to get it right, even with programs that claim to support long file
> > JS> names! As far as I can see, compiling with -D_FILE_OFFSET_BITS=64
> > JS> should do the trick, and it does seem to work, if you "nm" the result,
> > JS> you can see it uses open64, rather than open, but all the read/write
> > JS> functions remain the same!
> >
> > It's a bit tricky. You should compile with -DLARGEFILE64_SOURCE, use
> > O_LARGEFILE when opening file, and make sure that you've got support
> > or large files in both kernel and filesystem ( you need kernel 2.4;
> > write to FAT32 partition, because AFAIK ext2 filesystem does not
> > support large files ).
>
> Ah - thanks. I forgot about the fs problem - apparently you must mount
> reiserfs partitions with "-o conv" to upgrade 3.5.x disk format to 3.6
> for large files (although you cannot then mount the partition under
> Linux 2.2.x again, but why would you want to ;-> ).
I have just compiled an application which in turn produced a file with a
size of 4.7 GB on an ext2 partition, it seems that is possible to
produce such large files also under ext2. I have kernel 2.4.5, what you
also need is a new glibc, I have used 2.2. I had to change the
application slightly in order to get such a large file, the following
way:
open(realfname,O_WRONLY|O_CREAT | O_LARGEFILE, 0644);
Then I also had to pass a few defines to the compiler (which is a gcc
2.95-2 in my case ;-):
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE
Last but not least there's also an article in the net regarding this
topic:
http://www.suse.de/~aj/linux_lfs.html
Ah, 2 more things. I believe the blocksize of my ext2 partition the file
was written on is 4 kB/block. And there was also an article in the
german i'x 8/2000 where some hints were given.
HtH
Gerd
>
> -justin
>
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