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scsi: support NDOB (no data-out buffer) for WRITE SAME commands

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A NDOB bit set to one specifies that the disk shall not transfer data
from the data-out buffer and shall process the command as if the data-out
buffer contained user data set to all zeroes.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-03-08 16:17:59 +01:00
parent 05b6cc4ae2
commit 4397a01847
3 changed files with 8 additions and 2 deletions
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2
hw/scsi/scsi-disk.c
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@ -1807,7 +1807,7 @@ static void scsi_disk_emulate_write_same(SCSIDiskReq *r, uint8_t *inbuf)
return;
}
if (buffer_is_zero(inbuf, s->qdev.blocksize)) {
if ((req->cmd.buf[1] & 0x1) || buffer_is_zero(inbuf, s->qdev.blocksize)) {
int flags = (req->cmd.buf[1] & 0x8) ? BDRV_REQ_MAY_UNMAP : 0;
/* The request is used as the AIO opaque value, so add a ref. */