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scsi-disk: add need_fua_emulation to SCSIDiskClass

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scsi-block will be able to do FUA just by passing the request through
to the LUN (which is also more efficient); there is no need to emulate
it like we do for scsi-disk.

Add a new method to distinguish this.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-05-13 13:14:52 +02:00
parent fcaafb1001
commit 94f8ba1125
1 changed files with 7 additions and 2 deletions
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9
hw/scsi/scsi-disk.c
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@ -66,6 +66,7 @@ typedef struct SCSIDiskClass {
SCSIDeviceClass parent_class;
DMAIOFunc *dma_readv;
DMAIOFunc *dma_writev;
bool (*need_fua_emulation)(SCSICommand *cmd);
} SCSIDiskClass;
typedef struct SCSIDiskReq {
@ -75,6 +76,7 @@ typedef struct SCSIDiskReq {
uint32_t sector_count;
uint32_t buflen;
bool started;
bool need_fua_emulation;
struct iovec iov;
QEMUIOVector qiov;
BlockAcctCookie acct;
@ -236,7 +238,7 @@ static void scsi_write_do_fua(SCSIDiskReq *r)
goto done;
}
if (scsi_is_cmd_fua(&r->req.cmd)) {
if (r->need_fua_emulation) {
block_acct_start(blk_get_stats(s->qdev.conf.blk), &r->acct, 0,
BLOCK_ACCT_FLUSH);
r->req.aiocb = blk_aio_flush(s->qdev.conf.blk, scsi_aio_complete, r);
@ -413,7 +415,7 @@ static void scsi_read_data(SCSIRequest *req)
first = !r->started;
r->started = true;
if (first && scsi_is_cmd_fua(&r->req.cmd)) {
if (first && r->need_fua_emulation) {
block_acct_start(blk_get_stats(s->qdev.conf.blk), &r->acct, 0,
BLOCK_ACCT_FLUSH);
r->req.aiocb = blk_aio_flush(s->qdev.conf.blk, scsi_do_read_cb, r);
@ -2153,6 +2155,7 @@ static int32_t scsi_disk_dma_command(SCSIRequest *req, uint8_t *buf)
{
SCSIDiskReq *r = DO_UPCAST(SCSIDiskReq, req, req);
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, req->dev);
SCSIDiskClass *sdc = (SCSIDiskClass *) object_get_class(OBJECT(s));
uint32_t len;
uint8_t command;
@ -2211,6 +2214,7 @@ static int32_t scsi_disk_dma_command(SCSIRequest *req, uint8_t *buf)
scsi_check_condition(r, SENSE_CODE(LBA_OUT_OF_RANGE));
return 0;
}
r->need_fua_emulation = sdc->need_fua_emulation(&r->req.cmd);
if (r->sector_count == 0) {
scsi_req_complete(&r->req, GOOD);
}
@ -2700,6 +2704,7 @@ static void scsi_disk_base_class_initfn(ObjectClass *klass, void *data)
dc->reset = scsi_disk_reset;
sdc->dma_readv = scsi_dma_readv;
sdc->dma_writev = scsi_dma_writev;
sdc->need_fua_emulation = scsi_is_cmd_fua;
}
static const TypeInfo scsi_disk_base_info = {