Re: IDE from current bk tree, UDMA and two channels...

From: Alexander Viro (
Date: Thu Aug 01 2002 - 17:45:32 EST

On Thu, 1 Aug 2002, Linus Torvalds wrote:

> You probably saw this. Looks like blocksize has been buggered somehow.
> Apparently Petr has a 1kB blocksize optical device..

Yeah - with partition boundaries set not on a physical sector boundary ;-/

He's actually lucky that beginning of partition was not in the middle of
a physical sector...

Looks like we need
        a) accurate hardsect_size for these beasts (which is a problem
with current setup, since it's per-queue and not per-device; master and
slave can have different hardsect sizes).
        b) extra check in check_partitions() that would verify that
partition doesn't end in the middle of a sector (and round it down
if it does).

Basically, old code worked by accident on that setup - Petr had half-Kb
in the end of partition unaccessible and do_open() didn't notice that.
Now it does and tries to give such access. Disk is not happy...

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