[Linux-NTFS-Dev] smbfs large file (2GB+) support problem

[Szakacsits S. <sz...@si...>]

On Tue, 23 Mar 2004, Anton Altaparmakov wrote:

> >   3) There are LFS (large file support = 2 GB+) problems with smbfs. 
> >      Details are here: 
> > 
> > 	http://sf.net/forum/forum.php?thread_id=1043909&forum_id=44085
> > 
> >      Kernel 2.6 and 2.4.25 should support smbfs LFS but it seems it's
> >      buggy. Apparently it sends a slightly wrong request then XP or samba
> >      3.0 do create (ftruncate) the large file but they answer with "wrong
> >      parameters" what smbfs interprets as EFBIG (File too large). 
> > 
> >      I would really appreciate if other people could also confirm this
> >      kernel bug (smbfs maintainer didn't answer). Just try to ntfsclone
> >      a 2GB+ NTFS image to a Windows share (using NTFS on the remote 
> >      Windows is a must) or a Samba 3.0 share using 2.4.25 or 2.6 kernel
> >      (using e.g. ntfsclone --metadata -o remote.img /dev/hda1 is also ok)
> 
> Sorry but I don't have any NTFS partitions of that size so I can't try
> it.  )-:

Of course you do have:

	# create a 5GB sparse NTFS image
	touch 5gb-ntfs.img
	mkntfs -Ff 5gb-ntfs.img 10000000

	# create another 10 GB sparse image using a unix fs
 	dd if=/dev/zero of=10gb-unixfs.img bs=1024 count=1 seek=10000000
	mkfs.{xfs,ext2,ext3,jfs,reiserfs,reiser4}
	
	# loop mount the 10gb-unixfs image. This will be exported by samba
	mount -o loop 10gb-unixfs.img /mnt/samba-export

	configure /mnt/samba-export to be exported by samba
	start samba 3.0+

	# mount the samba share
	mount -t smbfs 127.0.0.1:/samba-export /mnt/samba-remote

	# do the test
	ntfsclone --metadata -o /mnt/samba-remote/ntfs.img 5gb-ntfs.img

The 5 GB sparse file gets created on the remote share but the kernel says
it couldn't create it.

Well, this was the harder way to test smbfs LFS ;) A much easier is like

   1) mount an Windows share having NTFS or a samba 3.0+ share

   2) dd if=/dev/zero of=/mnt/remore-share/foo bs=1024 count=1 seek=10000000

Please remember, you need at least 2.4.25 or 2.6 kernel. Older doesn't
have smbfs LFS support. And apparently these newer neither.

Cheers,
	Szaka