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scsi: simplify handling of the VPD page length field

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The last four bytes of the thin provisioning page were cut out.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-05-15 12:45:20 +02:00
parent 71ea2e0161
commit 8257939002
1 changed files with 7 additions and 8 deletions
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15
hw/scsi-disk.c
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@ -522,6 +522,7 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, req->dev);
int buflen = 0;
int start;
if (req->cmd.buf[1] & 0x1) {
/* Vital product data */
@ -530,14 +531,14 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
outbuf[buflen++] = s->qdev.type & 0x1f;
outbuf[buflen++] = page_code ; // this page
outbuf[buflen++] = 0x00;
outbuf[buflen++] = 0x00;
start = buflen;
switch (page_code) {
case 0x00: /* Supported page codes, mandatory */
{
int pages;
DPRINTF("Inquiry EVPD[Supported pages] "
"buffer size %zd\n", req->cmd.xfer);
pages = buflen++;
outbuf[buflen++] = 0x00; // list of supported pages (this page)
if (s->serial) {
outbuf[buflen++] = 0x80; // unit serial number
@ -547,7 +548,6 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
outbuf[buflen++] = 0xb0; // block limits
outbuf[buflen++] = 0xb2; // thin provisioning
}
outbuf[pages] = buflen - pages - 1; // number of pages
break;
}
case 0x80: /* Device serial number, optional */
@ -566,7 +566,6 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
DPRINTF("Inquiry EVPD[Serial number] "
"buffer size %zd\n", req->cmd.xfer);
outbuf[buflen++] = l;
memcpy(outbuf+buflen, s->serial, l);
buflen += l;
break;
@ -584,7 +583,6 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
DPRINTF("Inquiry EVPD[Device identification] "
"buffer size %zd\n", req->cmd.xfer);
outbuf[buflen++] = 4 + id_len;
outbuf[buflen++] = 0x2; // ASCII
outbuf[buflen++] = 0; // not officially assigned
outbuf[buflen++] = 0; // reserved
@ -609,8 +607,7 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
return -1;
}
/* required VPD size with unmap support */
outbuf[3] = buflen = 0x3c;
buflen = 0x40;
memset(outbuf + 4, 0, buflen - 4);
/* optimal transfer length granularity */
@ -632,7 +629,7 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
}
case 0xb2: /* thin provisioning */
{
outbuf[3] = buflen = 8;
buflen = 8;
outbuf[4] = 0;
outbuf[5] = 0x60; /* write_same 10/16 supported */
outbuf[6] = s->qdev.conf.discard_granularity ? 2 : 1;
@ -643,6 +640,8 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
return -1;
}
/* done with EVPD */
assert(buflen - start <= 255);
outbuf[start - 1] = buflen - start;
return buflen;
}