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dataplane: implement async flush

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Stop using the raw-posix file descriptor for synchronous
qemu_fdatasync().  Use bdrv_aio_flush() instead and drop the
VirtIOBlockDataPlane->fd field.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-05-08 16:34:57 +02:00
parent 0d6ecec252
commit 8d242f0ed5
1 changed files with 27 additions and 16 deletions
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43
hw/block/dataplane/virtio-blk.c
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@ -40,7 +40,6 @@ struct VirtIOBlockDataPlane {
bool stopping;
VirtIOBlkConf *blk;
int fd; /* image file descriptor */
VirtIODevice *vdev;
Vring vring; /* virtqueue vring */
@ -179,6 +178,32 @@ static void do_rdwr_cmd(VirtIOBlockDataPlane *s, bool read,
}
}
static void complete_flush(void *opaque, int ret)
{
VirtIOBlockRequest *req = opaque;
unsigned char status;
if (ret == 0) {
status = VIRTIO_BLK_S_OK;
} else {
status = VIRTIO_BLK_S_IOERR;
}
complete_request_early(req->s, req->elem, req->inhdr, status);
g_slice_free(VirtIOBlockRequest, req);
}
static void do_flush_cmd(VirtIOBlockDataPlane *s, VirtQueueElement *elem,
QEMUIOVector *inhdr)
{
VirtIOBlockRequest *req = g_slice_new(VirtIOBlockRequest);
req->s = s;
req->elem = elem;
req->inhdr = inhdr;
bdrv_aio_flush(s->blk->conf.bs, complete_flush, req);
}
static int process_request(VirtIOBlockDataPlane *s, VirtQueueElement *elem)
{
struct iovec *iov = elem->out_sg;
@ -232,12 +257,7 @@ static int process_request(VirtIOBlockDataPlane *s, VirtQueueElement *elem)
return 0;
case VIRTIO_BLK_T_FLUSH:
/* TODO fdsync not supported by Linux AIO, do it synchronously here! */
if (qemu_fdatasync(s->fd) < 0) {
complete_request_early(s, elem, inhdr, VIRTIO_BLK_S_IOERR);
} else {
complete_request_early(s, elem, inhdr, VIRTIO_BLK_S_OK);
}
do_flush_cmd(s, elem, inhdr);
return 0;
case VIRTIO_BLK_T_GET_ID:
@ -302,7 +322,6 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk,
Error **errp)
{
VirtIOBlockDataPlane *s;
int fd;
Error *local_err = NULL;
*dataplane = NULL;
@ -333,16 +352,8 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk,
return;
}
fd = raw_get_aio_fd(blk->conf.bs);
if (fd < 0) {
error_setg(errp, "drive is incompatible with x-data-plane, "
"use format=raw,cache=none,aio=native");
return;
}
s = g_new0(VirtIOBlockDataPlane, 1);
s->vdev = vdev;
s->fd = fd;
s->blk = blk;
if (blk->iothread) {