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

From: Alexander Viro (
Date: Thu Aug 01 2002 - 17:39:37 EST

On Fri, 2 Aug 2002, Marcin Dalecki wrote:

> > I'd like to apologize to Ingo, his changes were completely innocent.
> > Problem was triggered by Al's 'block device size cleanups' (currently
> > cset 1.403.160.5 on bkbits).
> >
> > Before this change, my system was using 4KB block size when reading
> > from /dev/hdc1, because of blk_size[][] (which is in 1kB units) of this
> > partition was multiple of 2, and so i_size % 4096 was 0. But after
> > Al's change partition size is read from gendisk, and not from blk_size,
> > and gendisk partition size is in 512 bytes units: and, as you can
> > probably guess, now my partition had i_size % 4096 == 512, and so only
> > 512 byte block size was choosen. And with 512 bytes block size my
> > harddisk refuses to cooperate.


Let me see if I got it straight:

a) your disk doesn't work with half-Kb requests
b) you have a partition with odd number of sectors
c) hardsect_size is set to half-Kb
d) old code worked since it rounded size to multiple of kilobyte.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

This archive was generated by hypermail 2b29 : Wed Aug 07 2002 - 22:00:17 EST