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virtio-blk: Fill in VirtIOBlockReq.out in dataplane code

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VirtIOBlockReq is allocated in process_request, and freed in command
functions.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2014-06-11 12:11:49 +08:00 committed by Kevin Wolf
parent 827805a249
commit ab2e3cd2dc
1 changed files with 44 additions and 58 deletions
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102
hw/block/dataplane/virtio-blk.c
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@ -87,55 +87,49 @@ static void complete_rdwr(void *opaque, int ret)
g_slice_free(VirtIOBlockReq, req);
}
static void complete_request_early(VirtIOBlockDataPlane *s, VirtQueueElement *elem,
struct virtio_blk_inhdr *inhdr,
unsigned char status)
static void complete_request_early(VirtIOBlockReq *req, unsigned char status)
{
stb_p(&inhdr->status, status);
stb_p(&req->in->status, status);
vring_push(&s->vring, elem, sizeof(*inhdr));
notify_guest(s);
vring_push(&req->dev->dataplane->vring, req->elem, sizeof(*req->in));
notify_guest(req->dev->dataplane);
g_slice_free(VirtIOBlockReq, req);
}
/* Get disk serial number */
static void do_get_id_cmd(VirtIOBlockDataPlane *s,
struct iovec *iov, unsigned int iov_cnt,
VirtQueueElement *elem,
struct virtio_blk_inhdr *inhdr)
static void do_get_id_cmd(VirtIOBlockReq *req,
struct iovec *iov, unsigned int iov_cnt)
{
char id[VIRTIO_BLK_ID_BYTES];
/* Serial number not NUL-terminated when longer than buffer */
strncpy(id, s->blk->serial ? s->blk->serial : "", sizeof(id));
strncpy(id, req->dev->blk.serial ? req->dev->blk.serial : "", sizeof(id));
iov_from_buf(iov, iov_cnt, 0, id, sizeof(id));
complete_request_early(s, elem, inhdr, VIRTIO_BLK_S_OK);
complete_request_early(req, VIRTIO_BLK_S_OK);
}
static void do_rdwr_cmd(VirtIOBlockDataPlane *s, bool read,
struct iovec *iov, unsigned iov_cnt,
int64_t sector_num, VirtQueueElement *elem,
struct virtio_blk_inhdr *inhdr)
static void do_rdwr_cmd(bool read, VirtIOBlockReq *req,
struct iovec *iov, unsigned iov_cnt)
{
VirtIOBlock *dev = VIRTIO_BLK(s->vdev);
VirtIOBlockReq *req = g_slice_new0(VirtIOBlockReq);
QEMUIOVector *qiov;
int nb_sectors;
int64_t sector_num;
/* Fill in virtio block metadata needed for completion */
req->elem = elem;
req->dev = dev;
req->in = inhdr;
qemu_iovec_init_external(&req->qiov, iov, iov_cnt);
qiov = &req->qiov;
sector_num = req->out.sector * 512 / BDRV_SECTOR_SIZE;
nb_sectors = qiov->size / BDRV_SECTOR_SIZE;
if (read) {
bdrv_aio_readv(s->blk->conf.bs, sector_num, qiov, nb_sectors,
bdrv_aio_readv(req->dev->blk.conf.bs,
sector_num, qiov, nb_sectors,
complete_rdwr, req);
} else {
bdrv_aio_writev(s->blk->conf.bs, sector_num, qiov, nb_sectors,
bdrv_aio_writev(req->dev->blk.conf.bs,
sector_num, qiov, nb_sectors,
complete_rdwr, req);
}
}
@ -151,29 +145,21 @@ static void complete_flush(void *opaque, int ret)
status = VIRTIO_BLK_S_IOERR;
}
complete_request_early(req->dev->dataplane, req->elem, req->in, status);
g_slice_free(VirtIOBlockReq, req);
complete_request_early(req, status);
}
static void do_flush_cmd(VirtIOBlockDataPlane *s, VirtQueueElement *elem,
struct virtio_blk_inhdr *inhdr)
static void do_flush_cmd(VirtIOBlockReq *req)
{
VirtIOBlock *dev = VIRTIO_BLK(s->vdev);
VirtIOBlockReq *req = g_slice_new0(VirtIOBlockReq);
req->dev = dev;
req->elem = elem;
req->in = inhdr;
bdrv_aio_flush(s->blk->conf.bs, complete_flush, req);
bdrv_aio_flush(req->dev->blk.conf.bs, complete_flush, req);
}
static void do_scsi_cmd(VirtIOBlockDataPlane *s, VirtQueueElement *elem,
struct virtio_blk_inhdr *inhdr)
static void do_scsi_cmd(VirtIOBlockReq *req)
{
int status;
status = virtio_blk_handle_scsi_req(VIRTIO_BLK(s->vdev), elem);
complete_request_early(s, elem, inhdr, status);
status = virtio_blk_handle_scsi_req(req->dev, req->elem);
complete_request_early(req, status);
}
static int process_request(VirtIOBlockDataPlane *s, VirtQueueElement *elem)
@ -182,59 +168,59 @@ static int process_request(VirtIOBlockDataPlane *s, VirtQueueElement *elem)
struct iovec *in_iov = elem->in_sg;
unsigned out_num = elem->out_num;
unsigned in_num = elem->in_num;
struct virtio_blk_outhdr outhdr;
struct virtio_blk_inhdr *inhdr;
VirtIOBlockReq *req;
req = g_slice_new(VirtIOBlockReq);
req->dev = VIRTIO_BLK(s->vdev);
req->elem = elem;
/* Copy in outhdr */
if (unlikely(iov_to_buf(iov, out_num, 0, &outhdr,
sizeof(outhdr)) != sizeof(outhdr))) {
if (unlikely(iov_to_buf(iov, out_num, 0, &req->out,
sizeof(req->out)) != sizeof(req->out))) {
error_report("virtio-blk request outhdr too short");
g_slice_free(VirtIOBlockReq, req);
return -EFAULT;
}
iov_discard_front(&iov, &out_num, sizeof(outhdr));
iov_discard_front(&iov, &out_num, sizeof(req->out));
/* We are likely safe with the iov_len check, because inhdr is only 1 byte,
* but checking here in case the header gets bigger in the future. */
if (in_num < 1 || in_iov[in_num - 1].iov_len < sizeof(*inhdr)) {
if (in_num < 1 || in_iov[in_num - 1].iov_len < sizeof(*req->in)) {
error_report("virtio-blk request inhdr too short");
return -EFAULT;
}
/* Grab inhdr for later */
inhdr = (void *)in_iov[in_num - 1].iov_base
+ in_iov[in_num - 1].iov_len - sizeof(*inhdr);
req->in = (void *)in_iov[in_num - 1].iov_base
+ in_iov[in_num - 1].iov_len - sizeof(*req->in);
iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr));
/* TODO Linux sets the barrier bit even when not advertised! */
outhdr.type &= ~VIRTIO_BLK_T_BARRIER;
req->out.type &= ~VIRTIO_BLK_T_BARRIER;
switch (outhdr.type) {
switch (req->out.type) {
case VIRTIO_BLK_T_IN:
do_rdwr_cmd(s, true, in_iov, in_num,
outhdr.sector * 512 / BDRV_SECTOR_SIZE,
elem, inhdr);
do_rdwr_cmd(true, req, in_iov, in_num);
return 0;
case VIRTIO_BLK_T_OUT:
do_rdwr_cmd(s, false, iov, out_num,
outhdr.sector * 512 / BDRV_SECTOR_SIZE,
elem, inhdr);
do_rdwr_cmd(false, req, iov, out_num);
return 0;
case VIRTIO_BLK_T_SCSI_CMD:
do_scsi_cmd(s, elem, inhdr);
do_scsi_cmd(req);
return 0;
case VIRTIO_BLK_T_FLUSH:
do_flush_cmd(s, elem, inhdr);
do_flush_cmd(req);
return 0;
case VIRTIO_BLK_T_GET_ID:
do_get_id_cmd(s, in_iov, in_num, elem, inhdr);
do_get_id_cmd(req, in_iov, in_num);
return 0;
default:
error_report("virtio-blk unsupported request type %#x", outhdr.type);
error_report("virtio-blk unsupported request type %#x", req->out.type);
g_slice_free(VirtIOBlockReq, req);
return -EFAULT;
}
}