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[Qemu-devel] [PATCH 4/4] scsi-disk: fix the block descriptor returned by
From: |
Bernhard Kohl |
Subject: |
[Qemu-devel] [PATCH 4/4] scsi-disk: fix the block descriptor returned by the MODE SENSE command |
Date: |
Mon, 2 Aug 2010 17:31:29 +0200 |
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 <address@hidden>
---
hw/scsi-disk.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 26f7345..519513c 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -642,9 +642,8 @@ static int scsi_disk_emulate_mode_sense(SCSIRequest *req,
uint8_t *outbuf)
else /* MODE_SENSE_10 */
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;
--
1.7.2