Bug#341888: Problem is gone in version 0.97-2

[Sven Joachim]

In the new grub package 0.97-2, I no longer see the dreadful message

Error 21: Selected disk does not exist

when running grub unter a 2.4 kernel.  AFICT, the only change that can be
responsible for this welcome change is the removal of the odirect.diff
patch, which was supposed to close #341888.  And in the manpage for open(2)
I found the following statement about a difference between 2.4 and 2.6
kernelswhich supports this conjecture:

	O_DIRECT
		Try to minimize  cache effects of the I/O to  and from this file.
		In general  this will  degrade performance, but  it is  useful in
		special  situations,  such  as  when applications  do  their  own
		caching.  File  I/O is done directly to/from  user space buffers.
		The I/O is  synchronous, i.e., at the completion  of a read(2) or
		write(2),  data is  guaranteed to  have been  transferred.  Under
		Linux 2.4  transfer sizes, and  the alignment of user  buffer and
		file offset  must all be multiples  of the logical  block size of
		the file system. Under Linux 2.6 alignment to 512-byte boundaries
		suffices.

So it seems that the odirect.diff patch introduced the problem, and since
it has been removed I'm closing this bug.