[9055] in linux-scsi channel archive
Re: Problem with MO in 2.2.16
daemon@ATHENA.MIT.EDU (M G Berberich)
Thu Jun 22 05:44:34 2000
Date: Thu, 22 Jun 2000 11:40:20 +0200
From: M G Berberich <berberic@forwiss.uni-passau.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-scsi@vger.rutgers.edu
Message-ID: <20000622114019.A15553@finarfin.forwiss.uni-passau.de>
Mail-Followup-To: Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-scsi@vger.rutgers.edu
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Hello,
The code that causes the "reset" of the sector-size is in
'drivers/block/genhd.c'
/*
* The Linux code now honours the rules the MO people set and
* is 'DOS compatible' - sizes are scaled by the media block
* size not 512 bytes. The following is a backwards
* compatibility check. If a 1k or greater sectorsize disk
* (1024, 2048, etc) was created under a pre 2.2 kernel,
* the partition table wrongly used units of 512 instead of
* units of sectorsize (1024, 2048, etc.) The below check attempts
* to detect a partition table created under the older kernel, and
* if so detected, it will reset the a sector scale factor to 1 (i.e.
* no scaling).
*/
disk_number_of_sects =3D NR_SECTS((&hd->part[MINOR(dev)]));
for (i =3D 0; i < 4; i++) {
char buf[MAX_DISKNAME_LEN];
struct partition *q =3D &p[i];
printk(" %s: -bmg- first_sector=3D %d\n",=20
disk_name(hd, MINOR(dev), buf), first_sector);
printk(" %s: -bmg- start_sector=3D %d\n",=20
disk_name(hd, MINOR(dev), buf), START_SECT(q));
printk(" %s: -bmg- nr_sector=3D %d\n",=20
disk_name(hd, MINOR(dev), buf), NR_SECTS(q));
printk(" %s: -bmg- sector_size=3D %d\n",=20
disk_name(hd, MINOR(dev), buf), sector_size);
printk(" %s: -bmg- disk_number_of_sects=3D%d\n",=20
disk_name(hd, MINOR(dev), buf), disk_number_of_sects);
if (NR_SECTS(q)) {
if (((first_sector+(START_SECT(q)+NR_SECTS(q))*sector_size) >
(disk_number_of_sects+1)) &&
((first_sector+(START_SECT(q)+NR_SECTS(q)) <=3D
disk_number_of_sects))) {
printk(" %s: RESETTINGING SECTOR SCALE from %d to 1",
disk_name(hd, MINOR(dev), buf), sector_size);
sector_size=3D1;
break;
}
}
}
(the printk's with '-bmg-' are from me) It gives this output if I try
to mount a MO:
sda: -bmg- first_sector=3D 0
sda: -bmg- start_sector=3D 1
sda: -bmg- nr_sector=3D 1241087
sda: -bmg- sector_size=3D 4
sda: -bmg- disk_number_of_sects=3D1241408
sda: RESETTINGING SECTOR SCALE from 4 to 1 sda1
'nr_sector' and 'disk_number_of_sects' seems to be in 512 bytes
blocks, while the MO is 2048 bytes hardsectored, which corresponds
with the 'sector_size' of 4.
MfG
bmg
--=20
"Des is v=F6llig wurscht, was heut beschlos- | M G Berberich
sen wird: I bin sowieso dagegn!" | berberic@fmi.uni-passau.de
(SPD-Stadtrat Kurt Schindler; Regensburg) | www.fmi.uni-passau.de/~berberic
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