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scsi-block: extract scsi_block_is_passthrough

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This will be used for both scsi_block_new_request and the scsi-block
implementation of parse_cdb.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-07-16 10:45:29 +02:00
parent ff34c32ccc
commit 592c3b289f
1 changed files with 26 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

38
hw/scsi/scsi-disk.c
View file

@ -2501,12 +2501,8 @@ static int scsi_block_initfn(SCSIDevice *dev)
return scsi_initfn(&s->qdev); return scsi_initfn(&s->qdev);
} }
static SCSIRequest *scsi_block_new_request(SCSIDevice *d, uint32_t tag, static bool scsi_block_is_passthrough(SCSIDiskState *s, uint8_t *buf)
uint32_t lun, uint8_t *buf,
void *hba_private)
{ {
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, d);
switch (buf[0]) { switch (buf[0]) {
case READ_6: case READ_6:
case READ_10: case READ_10:
@ -2523,9 +2519,9 @@ static SCSIRequest *scsi_block_new_request(SCSIDevice *d, uint32_t tag,
case WRITE_VERIFY_12: case WRITE_VERIFY_12:
case WRITE_VERIFY_16: case WRITE_VERIFY_16:
/* If we are not using O_DIRECT, we might read stale data from the /* If we are not using O_DIRECT, we might read stale data from the
* host cache if writes were made using other commands than these * host cache if writes were made using other commands than these
* ones (such as WRITE SAME or EXTENDED COPY, etc.). So, without * ones (such as WRITE SAME or EXTENDED COPY, etc.). So, without
* O_DIRECT everything must go through SG_IO. * O_DIRECT everything must go through SG_IO.
*/ */
if (!(bdrv_get_flags(s->qdev.conf.bs) & BDRV_O_NOCACHE)) { if (!(bdrv_get_flags(s->qdev.conf.bs) & BDRV_O_NOCACHE)) {
break; break;
@ -2542,13 +2538,31 @@ static SCSIRequest *scsi_block_new_request(SCSIDevice *d, uint32_t tag,
* just make scsi-block operate the same as scsi-generic for them. * just make scsi-block operate the same as scsi-generic for them.
*/ */
if (s->qdev.type != TYPE_ROM) { if (s->qdev.type != TYPE_ROM) {
return scsi_req_alloc(&scsi_disk_dma_reqops, &s->qdev, tag, lun, return false;
hba_private);
} }
break;
default:
break;
} }
return scsi_req_alloc(&scsi_generic_req_ops, &s->qdev, tag, lun, return true;
hba_private); }
static SCSIRequest *scsi_block_new_request(SCSIDevice *d, uint32_t tag,
uint32_t lun, uint8_t *buf,
void *hba_private)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, d);
if (scsi_block_is_passthrough(s, buf)) {
return scsi_req_alloc(&scsi_generic_req_ops, &s->qdev, tag, lun,
hba_private);
} else {
return scsi_req_alloc(&scsi_disk_dma_reqops, &s->qdev, tag, lun,
hba_private);
}
} }
#endif #endif