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scsi-generic: Merge block max xfer len in INQUIRY response

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The rationale is similar to the above mode sense response interception:
this is practically the only channel to communicate restraints from
elsewhere such as host and block driver.

The scsi bus we attach onto can have a larger max xfer len than what is
accepted by the host file system (guarding between the host scsi LUN and
QEMU), in which case the SG_IO we generate would get -EINVAL.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <1464243305-10661-3-git-send-email-famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Fam Zheng 2016-05-26 14:15:05 +08:00 committed by Paolo Bonzini
parent 8fdc7839e4
commit 063143d5b1
1 changed files with 12 additions and 0 deletions
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12
hw/scsi/scsi-generic.c
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@ -222,6 +222,18 @@ static void scsi_read_complete(void * opaque, int ret)
r->buf[3] |= 0x80;
}
}
if (s->type == TYPE_DISK &&
r->req.cmd.buf[0] == INQUIRY &&
r->req.cmd.buf[2] == 0xb0) {
uint32_t max_xfer_len = blk_get_max_transfer_length(s->conf.blk);
if (max_xfer_len) {
stl_be_p(&r->buf[8], max_xfer_len);
/* Also take care of the opt xfer len. */
if (ldl_be_p(&r->buf[12]) > max_xfer_len) {
stl_be_p(&r->buf[12], max_xfer_len);
}
}
}
scsi_req_data(&r->req, len);
scsi_req_unref(&r->req);
}