From: eric@tantalus.dell.com (Eric Youngdale) Subject: Re: 0.97pl4 breaks SCSI extended partition code Date: 9 Sep 1992 05:52:44 GMT
In article <1992Sep9.000644.1996@galileo.cc.rochester.edu> ctne_ltd@uhura.cc.rochester.edu (Chris Newbold) writes:
>Okay. This looks like a generic problem with the SCSI extended partition code.
>I have seen several senarios which result in the problems described above.
>
> 1. Adding the CD-ROM filesystem extentions did it for me.
> 2. Compiling the kernel under GCC v2.2.2d did it for some
> 3. Now, looks like pl4 has blown it in this case.
>
>I was trying to work with Eric (the author of the CD-ROM stuff) to find
>out what goes wrong, but my disk controller flaked out and I haven't
>had a machine for the last week...
I found another guinea pig, and it appears as if we are closing in
on the solution. What I do know is that make_request in ll_rw_blk.c returns
because it believes that the read is beyond the end of the partition.
Specifically, the problem shows up in the following segment:
count = bh->b_size >> 9;
sector = bh->b_blocknr * count;
if (blk_size[major])
if (blk_size[major][MINOR(bh->b_dev)] < (sector + count)>>1) {
bh->b_dirt = bh->b_uptodate = 0;
return;
}
As of yet, I do not know whether the blk_size array is incorrect or if sector
or count is corrupt, or whether we are not converting something somewhere.
I hope that within a day that we will have enough information to squash this
bug.
-Eric