FW: "attempt to access beyond end of device" on shared UDF volumes

[Peter Waechtler]

Am Donnerstag, 2. September 2004 21:06 schrieb Anthony Russello:
> > Hi,
> >
> > I am trying to track down an issue in which writes to a UDF
> > volume that is shared via samba result in the following error:
> >
> > <snip>
> > attempt to access beyond end of device
> > 0b:01: rw=1, want=1120061380, limit=34181760
> > </snip>
> >
> > The 'want=' value is usually different, and can also be zero
> > in some instances.
> >
> > The volume is an Iomega REV drive formatted using the UDF
> > filesystem.  Here are the specifications for my test system:
> >
> > kernel 2.4.26
> > applied the following patches:
> >   - patches-be.dvd.ram-20040816 (from
> > http://iomrrdtools.sourceforge.net/)
> >
> > samba version 3.0.5
> >
> > The error occurs when I copy a folder with subfolders from a
> > Windows XP (both SP1 and SP2) workstation to a samba share
> > that is linked to the mount point for the Iomega REV drive.
> >
> > It should be noted that I have not been able to reproduce
> > this issue when I connect to the same share using a linux
> > workstation (also running samba 3.0.5).  Also, this error
> > does not occur when I am copying files and folders locally on
> > the workstation with the REV drive.
> >
> > The fact that I cannot seem to reproduce the error by copying
> > files and folders locally has me thinking it might be related
> > to samba and XP writing to a samba share.
> >

Then copy it several times into different subdirs locally.
This way you can provoke that the blocklayer will hit blocks
outside of the block device more likely.
I bet that this has nothing to do with Samba - Samba runs in user space
and does not choose the blocks for the filesystem.

The block numbers look like an overflow in the UDF or blockdevice layers.