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scsi-disk: fix the block descriptor returned by the MODE SENSE command 

The block descriptor contains the number of blocks, not the highest LBA.
Real hard disks return 0 if the number of blocks exceed the maximum 0xFFFFFF.

SCSI-Spec:
http://ldkelley.com/SCSI2/SCSI2/SCSI2-08.html#8.3.3
"The number of blocks field specifies the number of logical blocks on the
medium to which the density code and block length fields apply. A value
of zero indicates that all of the remaining logical blocks of the logical
unit shall have the medium characteristics specified."

Signed-off-by: Bernhard Kohl <bernhard.kohl@nsn.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Bernhard Kohl 2010-08-31 14:08:25 +02:00 committed by Kevin Wolf
parent 282ab04eb1
commit 2488b74081
1 changed files with 1 additions and 2 deletions
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3
hw/scsi-disk.c
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@ -662,9 +662,8 @@ static int scsi_disk_emulate_mode_sense(SCSIRequest *req, uint8_t *outbuf)
outbuf[7] = 8; /* Block descriptor length */
}
nb_sectors /= s->cluster_size;
nb_sectors--;
if (nb_sectors > 0xffffff)
nb_sectors = 0xffffff;
nb_sectors = 0;
p[0] = 0; /* media density code */
p[1] = (nb_sectors >> 16) & 0xff;
p[2] = (nb_sectors >> 8) & 0xff;