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block: Give nonzero result to blk_get_max_transfer_length()

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Making all callers special-case 0 as unlimited is awkward,
and we DO have a hard maximum of BDRV_REQUEST_MAX_SECTORS given
our current block layer API limits.

In the case of scsi, this means that we now always advertise a
limit to the guest, even in cases where the underlying layers
previously use 0 for no inherent limit beyond the block layer.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2016-06-23 16:37:12 -06:00 • committed by Kevin Wolf
parent efaf4781a9
commit 24ce9a2026
3 changed files with 11 additions and 11 deletions
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12
hw/scsi/scsi-generic.c
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@ -227,12 +227,12 @@ static void scsi_read_complete(void * opaque, int ret)
r->req.cmd.buf[2] == 0xb0) {
uint32_t max_xfer_len = blk_get_max_transfer_length(s->conf.blk) /
(s->blocksize / BDRV_SECTOR_SIZE);
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);
}
assert(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);