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scsi-disk: restruct emulation: READ_CAPACITY 

Move READ_CAPACITY emulation from scsi_send_command() to
scsi_disk_emulate_command().

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Gerd Hoffmann 2009-11-26 15:34:09 +01:00 committed by Anthony Liguori
parent c68b9f34c1
commit e7e25e3269
1 changed files with 27 additions and 28 deletions
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55
hw/scsi-disk.c
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@ -617,7 +617,9 @@ static int scsi_disk_emulate_mode_sense(SCSIRequest *req, uint8_t *outbuf)
static int scsi_disk_emulate_command(SCSIRequest *req, uint8_t *outbuf)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, req->dev);
BlockDriverState *bdrv = req->dev->dinfo->bdrv;
uint64_t nb_sectors;
int buflen = 0;
switch (req->cmd.buf[0]) {
@ -679,6 +681,30 @@ static int scsi_disk_emulate_command(SCSIRequest *req, uint8_t *outbuf)
case ALLOW_MEDIUM_REMOVAL:
bdrv_set_locked(bdrv, req->cmd.buf[4] & 1);
break;
case READ_CAPACITY:
/* The normal LEN field for this command is zero. */
memset(outbuf, 0, 8);
bdrv_get_geometry(bdrv, &nb_sectors);
if (!nb_sectors)
goto not_ready;
nb_sectors /= s->cluster_size;
/* Returned value is the address of the last sector. */
nb_sectors--;
/* Remember the new size for read/write sanity checking. */
s->max_lba = nb_sectors;
/* Clip to 2TB, instead of returning capacity modulo 2TB. */
if (nb_sectors > UINT32_MAX)
nb_sectors = UINT32_MAX;
outbuf[0] = (nb_sectors >> 24) & 0xff;
outbuf[1] = (nb_sectors >> 16) & 0xff;
outbuf[2] = (nb_sectors >> 8) & 0xff;
outbuf[3] = nb_sectors & 0xff;
outbuf[4] = 0;
outbuf[5] = 0;
outbuf[6] = s->cluster_size * 2;
outbuf[7] = 0;
buflen = 8;
break;
default:
goto illegal_request;
}
@ -792,6 +818,7 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
case RELEASE_10:
case START_STOP:
case ALLOW_MEDIUM_REMOVAL:
case READ_CAPACITY:
rc = scsi_disk_emulate_command(&r->req, outbuf);
if (rc > 0) {
r->iov.iov_len = rc;
@ -801,34 +828,6 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
return 0;
}
break;
case READ_CAPACITY:
DPRINTF("Read Capacity\n");
/* The normal LEN field for this command is zero. */
memset(outbuf, 0, 8);
bdrv_get_geometry(s->qdev.dinfo->bdrv, &nb_sectors);
nb_sectors /= s->cluster_size;
/* Returned value is the address of the last sector. */
if (nb_sectors) {
nb_sectors--;
/* Remember the new size for read/write sanity checking. */
s->max_lba = nb_sectors;
/* Clip to 2TB, instead of returning capacity modulo 2TB. */
if (nb_sectors > UINT32_MAX)
nb_sectors = UINT32_MAX;
outbuf[0] = (nb_sectors >> 24) & 0xff;
outbuf[1] = (nb_sectors >> 16) & 0xff;
outbuf[2] = (nb_sectors >> 8) & 0xff;
outbuf[3] = nb_sectors & 0xff;
outbuf[4] = 0;
outbuf[5] = 0;
outbuf[6] = s->cluster_size * 2;
outbuf[7] = 0;
r->iov.iov_len = 8;
} else {
scsi_command_complete(r, CHECK_CONDITION, NOT_READY);
return 0;
}
break;
case READ_6:
case READ_10:
case 0x88: