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scsi disk block descriptor v2 

The SCSI-2 documentation suggests, that although the block
descriptor is optional for an arbitrary SCSI-2 device (chapter 8.2.10,
http://ldkelley.com/SCSI2/SCSI2/SCSI2/SCSI2/SCSI2-08.html )
it is mandatory for a disk: chapters 9.1.2, 9.3.3
( http://ldkelley.com/SCSI2/SCSI2/SCSI2/SCSI2-09.html ) don't say
"optional" any more, just "The block descriptor in the MODE SENSE
data describes the block lengths that are used on the medium."

v2: limit the number of sectors reported in the block descriptor to 24 bits.

Signed-off-by: Artyom Tarasenko <atar4qemu@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Artyom Tarasenko 2009-10-13 23:46:24 +02:00 committed by Blue Swirl
parent 930f3fe11f
commit 6550f2e676
1 changed files with 21 additions and 1 deletions
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22
hw/scsi-disk.c
View File

@ -624,7 +624,9 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
{
uint8_t *p;
int page;
int dbd;
dbd = buf[1] & 0x8;
page = buf[2] & 0x3f;
DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
p = outbuf;
@ -635,6 +637,24 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
outbuf[2] = 0x80; /* Readonly. */
}
p += 4;
bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
if ((~dbd) & nb_sectors) {
nb_sectors /= s->cluster_size;
nb_sectors--;
if (nb_sectors > 0xffffff)
nb_sectors = 0xffffff;
outbuf[3] = 8; /* Block descriptor length */
p[0] = 0; /* media density code */
p[1] = (nb_sectors >> 16) & 0xff;
p[2] = (nb_sectors >> 8) & 0xff;
p[3] = nb_sectors & 0xff;
p[4] = 0; /* reserved */
p[5] = 0; /* bytes 5-7 are the sector size in bytes */
p[6] = s->cluster_size * 2;
p[7] = 0;
p += 8;
}
if (page == 4) {
int cylinders, heads, secs;