@@ -51,6 +51,7 @@
/module_block.h
/vscclient
/vhost-user-scsi
+/vhost-user-blk
/fsdev/virtfs-proxy-helper
*.[1-9]
*.a
@@ -270,6 +270,7 @@ dummy := $(call unnest-vars,, \
ivshmem-server-obj-y \
libvhost-user-obj-y \
vhost-user-scsi-obj-y \
+ vhost-user-blk-obj-y \
qga-vss-dll-obj-y \
block-obj-y \
block-obj-m \
@@ -478,6 +479,8 @@ ivshmem-server$(EXESUF): $(ivshmem-server-obj-y) $(COMMON_LDADDS)
endif
vhost-user-scsi$(EXESUF): $(vhost-user-scsi-obj-y)
$(call LINK, $^)
+vhost-user-blk$(EXESUF): $(vhost-user-blk-obj-y)
+ $(call LINK, $^)
module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
$(call quiet-command,$(PYTHON) $< $@ \
@@ -114,6 +114,8 @@ vhost-user-scsi.o-cflags := $(LIBISCSI_CFLAGS)
vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
vhost-user-scsi-obj-y += contrib/libvhost-user/libvhost-user.o
+vhost-user-blk-obj-y = contrib/vhost-user-blk/
+vhost-user-blk-obj-y += contrib/libvhost-user/libvhost-user.o
######################################################################
trace-events-subdirs =
new file mode 100644
@@ -0,0 +1 @@
+vhost-user-blk-obj-y = vhost-user-blk.o
new file mode 100644
@@ -0,0 +1,695 @@
+/*
+ * vhost-user-blk sample application
+ *
+ * Copyright IBM, Corp. 2007
+ * Copyright (c) 2016 Nutanix Inc. All rights reserved.
+ * Copyright (c) 2017 Intel Corporation. All rights reserved.
+ *
+ * Author:
+ * Anthony Liguori <aliguori@us.ibm.com>
+ * Felipe Franciosi <felipe@nutanix.com>
+ * Changpeng Liu <changpeng.liu@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 only.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/virtio/virtio-blk.h"
+#include "contrib/libvhost-user/libvhost-user.h"
+
+#include <glib.h>
+
+/* Small compat shim from glib 2.32 */
+#ifndef G_SOURCE_CONTINUE
+#define G_SOURCE_CONTINUE TRUE
+#endif
+#ifndef G_SOURCE_REMOVE
+#define G_SOURCE_REMOVE FALSE
+#endif
+
+/* 1 IO queue with 128 entries */
+#define VIRTIO_BLK_QUEUE_NUM 128
+/* And this is the final byte of request*/
+#define VIRTIO_BLK_S_OK 0
+#define VIRTIO_BLK_S_IOERR 1
+#define VIRTIO_BLK_S_UNSUPP 2
+
+struct vhost_blk_dev {
+ VuDev vu_dev;
+ int server_sock;
+ int blk_fd;
+ char *blk_name;
+ GMainLoop *loop;
+ GTree *fdmap; /* fd -> gsource context id */
+};
+
+struct vhost_blk_request {
+ VuVirtqElement *elem;
+ int64_t sector_num;
+ size_t size;
+ struct virtio_blk_inhdr *in;
+ struct virtio_blk_outhdr *out;
+ struct vhost_blk_dev *vdev_blk;
+ struct VuVirtq *vq;
+};
+
+/** refer util/iov.c **/
+static size_t vu_blk_iov_size(const struct iovec *iov,
+ const unsigned int iov_cnt)
+{
+ size_t len;
+ unsigned int i;
+
+ len = 0;
+ for (i = 0; i < iov_cnt; i++) {
+ len += iov[i].iov_len;
+ }
+ return len;
+}
+
+/** glib event loop integration for libvhost-user and misc callbacks **/
+
+QEMU_BUILD_BUG_ON((int)G_IO_IN != (int)VU_WATCH_IN);
+QEMU_BUILD_BUG_ON((int)G_IO_OUT != (int)VU_WATCH_OUT);
+QEMU_BUILD_BUG_ON((int)G_IO_PRI != (int)VU_WATCH_PRI);
+QEMU_BUILD_BUG_ON((int)G_IO_ERR != (int)VU_WATCH_ERR);
+QEMU_BUILD_BUG_ON((int)G_IO_HUP != (int)VU_WATCH_HUP);
+
+typedef struct vu_blk_gsrc {
+ GSource parent;
+ struct vhost_blk_dev *vdev_blk;
+ GPollFD gfd;
+ vu_watch_cb vu_cb;
+} vu_blk_gsrc_t;
+
+static gint vu_blk_fdmap_compare(gconstpointer a, gconstpointer b)
+{
+ return (b > a) - (b < a);
+}
+
+static gboolean vu_blk_gsrc_prepare(GSource *src, gint *timeout)
+{
+ assert(timeout);
+
+ *timeout = -1;
+ return FALSE;
+}
+
+static gboolean vu_blk_gsrc_check(GSource *src)
+{
+ vu_blk_gsrc_t *vu_blk_src = (vu_blk_gsrc_t *)src;
+
+ assert(vu_blk_src);
+
+ return vu_blk_src->gfd.revents & vu_blk_src->gfd.events;
+}
+
+static gboolean vu_blk_gsrc_dispatch(GSource *src,
+ GSourceFunc cb, gpointer data)
+{
+ struct vhost_blk_dev *vdev_blk;
+ vu_blk_gsrc_t *vu_blk_src = (vu_blk_gsrc_t *)src;
+
+ assert(vu_blk_src);
+ assert(!(vu_blk_src->vu_cb && cb));
+
+ vdev_blk = vu_blk_src->vdev_blk;
+
+ assert(vdev_blk);
+
+ if (cb) {
+ return cb(data);
+ }
+ if (vu_blk_src->vu_cb) {
+ vu_blk_src->vu_cb(&vdev_blk->vu_dev, vu_blk_src->gfd.revents, data);
+ }
+ return G_SOURCE_CONTINUE;
+}
+
+static GSourceFuncs vu_blk_gsrc_funcs = {
+ vu_blk_gsrc_prepare,
+ vu_blk_gsrc_check,
+ vu_blk_gsrc_dispatch,
+ NULL
+};
+
+static int vu_blk_gsrc_new(struct vhost_blk_dev *vdev_blk, int fd,
+ GIOCondition cond, vu_watch_cb vu_cb,
+ GSourceFunc gsrc_cb, gpointer data)
+{
+ GSource *vu_blk_gsrc;
+ vu_blk_gsrc_t *vu_blk_src;
+ guint id;
+
+ assert(vdev_blk);
+ assert(fd >= 0);
+ assert(vu_cb || gsrc_cb);
+ assert(!(vu_cb && gsrc_cb));
+
+ vu_blk_gsrc = g_source_new(&vu_blk_gsrc_funcs, sizeof(vu_blk_gsrc_t));
+ if (!vu_blk_gsrc) {
+ fprintf(stderr, "Error creating GSource for new watch\n");
+ return -1;
+ }
+ vu_blk_src = (vu_blk_gsrc_t *)vu_blk_gsrc;
+
+ vu_blk_src->vdev_blk = vdev_blk;
+ vu_blk_src->gfd.fd = fd;
+ vu_blk_src->gfd.events = cond;
+ vu_blk_src->vu_cb = vu_cb;
+
+ g_source_add_poll(vu_blk_gsrc, &vu_blk_src->gfd);
+ g_source_set_callback(vu_blk_gsrc, gsrc_cb, data, NULL);
+ id = g_source_attach(vu_blk_gsrc, NULL);
+ assert(id);
+ g_source_unref(vu_blk_gsrc);
+
+ g_tree_insert(vdev_blk->fdmap, (gpointer)(uintptr_t)fd,
+ (gpointer)(uintptr_t)id);
+
+ return 0;
+}
+
+static void vu_blk_panic_cb(VuDev *vu_dev, const char *buf)
+{
+ struct vhost_blk_dev *vdev_blk;
+
+ assert(vu_dev);
+
+ vdev_blk = (struct vhost_blk_dev *)((uintptr_t)vu_dev -
+ offsetof(struct vhost_blk_dev, vu_dev));
+
+ if (buf) {
+ fprintf(stderr, "vu_blk_panic_cb: %s\n", buf);
+ }
+
+ if (vdev_blk) {
+ assert(vdev_blk->loop);
+ g_main_loop_quit(vdev_blk->loop);
+ }
+}
+
+static void vu_blk_add_watch_cb(VuDev *vu_dev, int fd, int vu_evt,
+ vu_watch_cb cb, void *pvt) {
+ struct vhost_blk_dev *vdev_blk;
+ guint id;
+
+ assert(vu_dev);
+ assert(fd >= 0);
+ assert(cb);
+
+ vdev_blk = (struct vhost_blk_dev *)((uintptr_t)vu_dev -
+ offsetof(struct vhost_blk_dev, vu_dev));
+ if (!vdev_blk) {
+ vu_blk_panic_cb(vu_dev, NULL);
+ return;
+ }
+
+ id = (guint)(uintptr_t)g_tree_lookup(vdev_blk->fdmap,
+ (gpointer)(uintptr_t)fd);
+ if (id) {
+ GSource *vu_blk_src = g_main_context_find_source_by_id(NULL, id);
+ assert(vu_blk_src);
+ g_source_destroy(vu_blk_src);
+ (void)g_tree_remove(vdev_blk->fdmap, (gpointer)(uintptr_t)fd);
+ }
+
+ if (vu_blk_gsrc_new(vdev_blk, fd, vu_evt, cb, NULL, pvt)) {
+ vu_blk_panic_cb(vu_dev, NULL);
+ }
+}
+
+static void vu_blk_del_watch_cb(VuDev *vu_dev, int fd)
+{
+ struct vhost_blk_dev *vdev_blk;
+ guint id;
+
+ assert(vu_dev);
+ assert(fd >= 0);
+
+ vdev_blk = (struct vhost_blk_dev *)((uintptr_t)vu_dev -
+ offsetof(struct vhost_blk_dev, vu_dev));
+ if (!vdev_blk) {
+ vu_blk_panic_cb(vu_dev, NULL);
+ return;
+ }
+
+ id = (guint)(uintptr_t)g_tree_lookup(vdev_blk->fdmap,
+ (gpointer)(uintptr_t)fd);
+ if (id) {
+ GSource *vu_blk_src = g_main_context_find_source_by_id(NULL, id);
+ assert(vu_blk_src);
+ g_source_destroy(vu_blk_src);
+ (void)g_tree_remove(vdev_blk->fdmap, (gpointer)(uintptr_t)fd);
+ }
+}
+
+static void vu_blk_req_complete(struct vhost_blk_request *req)
+{
+ VuDev *vu_dev = &req->vdev_blk->vu_dev;
+
+ /* IO size with 1 extra status byte */
+ vu_queue_push(vu_dev, req->vq, req->elem,
+ req->size + 1);
+ vu_queue_notify(vu_dev, req->vq);
+
+ if (req->elem) {
+ free(req->elem);
+ }
+ if (req) {
+ free(req);
+ }
+}
+
+static int vu_blk_open(const char *file_name)
+{
+ int fd;
+
+ fd = open(file_name, O_RDWR | O_DIRECT);
+ if (fd < 0) {
+ fprintf(stderr, "Cannot open file %s, %s\n", file_name,
+ strerror(errno));
+ return -1;
+ }
+
+ return fd;
+}
+
+static void vu_blk_close(int fd)
+{
+ if (fd >= 0) {
+ close(fd);
+ }
+}
+
+static ssize_t
+vu_blk_readv(struct vhost_blk_request *req, struct iovec *iov, uint32_t iovcnt)
+{
+ struct vhost_blk_dev *vdev_blk = req->vdev_blk;
+ ssize_t rc;
+
+ req->size = vu_blk_iov_size(iov, iovcnt);
+ rc = preadv(vdev_blk->blk_fd, iov, iovcnt, req->sector_num * 512);
+ if (rc < 0) {
+ fprintf(stderr, "Block %s, Sector %"PRIu64", Size %lu Read Failed\n",
+ vdev_blk->blk_name, req->sector_num, req->size);
+ return -1;
+ }
+
+ return rc;
+}
+
+static ssize_t
+vu_blk_writev(struct vhost_blk_request *req, struct iovec *iov, uint32_t iovcnt)
+{
+ struct vhost_blk_dev *vdev_blk = req->vdev_blk;
+ ssize_t rc;
+
+ req->size = vu_blk_iov_size(iov, iovcnt);
+ rc = pwritev(vdev_blk->blk_fd, iov, iovcnt, req->sector_num * 512);
+ if (rc < 0) {
+ fprintf(stderr, "Block %s, Sector %"PRIu64", Size %lu Write Failed\n",
+ vdev_blk->blk_name, req->sector_num, req->size);
+ return -1;
+ }
+
+ return rc;
+}
+
+static void
+vu_blk_flush(struct vhost_blk_request *req)
+{
+ struct vhost_blk_dev *vdev_blk = req->vdev_blk;
+
+ if (vdev_blk->blk_fd) {
+ fsync(vdev_blk->blk_fd);
+ }
+}
+
+
+static int vu_virtio_blk_process_req(struct vhost_blk_dev *vdev_blk,
+ VuVirtq *vq)
+{
+ VuVirtqElement *elem;
+ uint32_t type;
+ unsigned in_num;
+ unsigned out_num;
+ struct vhost_blk_request *req;
+
+ elem = vu_queue_pop(&vdev_blk->vu_dev, vq, sizeof(VuVirtqElement));
+ if (!elem) {
+ return -1;
+ }
+
+ /* refer virtio_blk.c */
+ if (elem->out_num < 1 || elem->in_num < 1) {
+ fprintf(stderr, "Invalid descriptor\n");
+ return -1;
+ }
+
+ req = calloc(1, sizeof(*req));
+ assert(req);
+ req->vdev_blk = vdev_blk;
+ req->vq = vq;
+ req->elem = elem;
+
+ in_num = elem->in_num;
+ out_num = elem->out_num;
+
+ if (elem->out_sg[0].iov_len < sizeof(struct virtio_blk_outhdr)) {
+ fprintf(stderr, "Invalid outhdr size\n");
+ free(req);
+ return -1;
+ }
+ req->out = (struct virtio_blk_outhdr *)elem->out_sg[0].iov_base;
+ out_num--;
+
+ if (elem->in_sg[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) {
+ fprintf(stderr, "Invalid inhdr size\n");
+ free(req);
+ return -1;
+ }
+ req->in = (struct virtio_blk_inhdr *)elem->in_sg[in_num - 1].iov_base;
+ in_num--;
+
+ type = le32_to_cpu(req->out->type);
+ switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) {
+ case VIRTIO_BLK_T_IN: {
+ ssize_t ret = 0;
+ bool is_write = type & VIRTIO_BLK_T_OUT;
+ req->sector_num = le64_to_cpu(req->out->sector);
+ if (is_write) {
+ assert(out_num != 0);
+ ret = vu_blk_writev(req, &elem->out_sg[1], out_num);
+ } else {
+ assert(in_num != 0);
+ ret = vu_blk_readv(req, &elem->in_sg[0], in_num);
+ }
+ if (ret >= 0) {
+ req->in->status = VIRTIO_BLK_S_OK;
+ } else {
+ req->in->status = VIRTIO_BLK_S_IOERR;
+ }
+ vu_blk_req_complete(req);
+ break;
+ }
+ case VIRTIO_BLK_T_FLUSH: {
+ vu_blk_flush(req);
+ req->in->status = VIRTIO_BLK_S_OK;
+ vu_blk_req_complete(req);
+ break;
+ }
+ case VIRTIO_BLK_T_GET_ID: {
+ size_t size = MIN(vu_blk_iov_size(&elem->in_sg[0], in_num),
+ VIRTIO_BLK_ID_BYTES);
+ snprintf(elem->in_sg[0].iov_base, size, "%s", "vhost_user_blk");
+ req->in->status = VIRTIO_BLK_S_OK;
+ req->size = elem->in_sg[0].iov_len;
+ vu_blk_req_complete(req);
+ break;
+ }
+ default: {
+ req->in->status = VIRTIO_BLK_S_UNSUPP;
+ vu_blk_req_complete(req);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static void vu_blk_process_vq(VuDev *vu_dev, int idx)
+{
+ struct vhost_blk_dev *vdev_blk;
+ VuVirtq *vq;
+ int ret;
+
+ if ((idx < 0) || (idx >= VHOST_MAX_NR_VIRTQUEUE)) {
+ fprintf(stderr, "VQ Index out of range: %d\n", idx);
+ vu_blk_panic_cb(vu_dev, NULL);
+ return;
+ }
+
+
+ vdev_blk = (struct vhost_blk_dev *)((uintptr_t)vu_dev -
+ offsetof(struct vhost_blk_dev, vu_dev));
+ assert(vdev_blk);
+
+ vq = vu_get_queue(vu_dev, idx);
+ assert(vq);
+
+ while (1) {
+ ret = vu_virtio_blk_process_req(vdev_blk, vq);
+ if (ret) {
+ break;
+ }
+ }
+}
+
+static void vu_blk_queue_set_started(VuDev *vu_dev, int idx, bool started)
+{
+ VuVirtq *vq;
+
+ assert(vu_dev);
+
+ if ((idx < 0) || (idx >= VHOST_MAX_NR_VIRTQUEUE)) {
+ fprintf(stderr, "VQ Index out of range: %d\n", idx);
+ vu_blk_panic_cb(vu_dev, NULL);
+ return;
+ }
+
+ vq = vu_get_queue(vu_dev, idx);
+ vu_set_queue_handler(vu_dev, vq, started ? vu_blk_process_vq : NULL);
+}
+
+static uint64_t
+vu_blk_get_features(VuDev *dev)
+{
+ return 1ull << VIRTIO_BLK_F_SIZE_MAX |
+ 1ull << VIRTIO_BLK_F_SEG_MAX |
+ 1ull << VIRTIO_BLK_F_TOPOLOGY |
+ 1ull << VIRTIO_BLK_F_BLK_SIZE |
+ 1ull << VIRTIO_F_VERSION_1 |
+ 1ull << VHOST_USER_F_PROTOCOL_FEATURES;
+}
+
+static const VuDevIface vu_blk_iface = {
+ .get_features = vu_blk_get_features,
+ .queue_set_started = vu_blk_queue_set_started,
+};
+
+static gboolean vu_blk_vhost_cb(gpointer data)
+{
+ VuDev *vu_dev = (VuDev *)data;
+
+ assert(vu_dev);
+
+ if (!vu_dispatch(vu_dev) != 0) {
+ fprintf(stderr, "Error processing vhost message\n");
+ vu_blk_panic_cb(vu_dev, NULL);
+ return G_SOURCE_REMOVE;
+ }
+
+ return G_SOURCE_CONTINUE;
+}
+
+static int unix_sock_new(char *unix_fn)
+{
+ int sock;
+ struct sockaddr_un un;
+ size_t len;
+
+ assert(unix_fn);
+
+ sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (sock <= 0) {
+ perror("socket");
+ return -1;
+ }
+
+ un.sun_family = AF_UNIX;
+ (void)snprintf(un.sun_path, sizeof(un.sun_path), "%s", unix_fn);
+ len = sizeof(un.sun_family) + strlen(un.sun_path);
+
+ (void)unlink(unix_fn);
+ if (bind(sock, (struct sockaddr *)&un, len) < 0) {
+ perror("bind");
+ goto fail;
+ }
+
+ if (listen(sock, 1) < 0) {
+ perror("listen");
+ goto fail;
+ }
+
+ return sock;
+
+fail:
+ (void)close(sock);
+
+ return -1;
+}
+
+static int vdev_blk_run(struct vhost_blk_dev *vdev_blk)
+{
+ int cli_sock;
+ int ret = 0;
+
+ assert(vdev_blk);
+ assert(vdev_blk->server_sock >= 0);
+ assert(vdev_blk->loop);
+
+ cli_sock = accept(vdev_blk->server_sock, (void *)0, (void *)0);
+ if (cli_sock < 0) {
+ perror("accept");
+ return -1;
+ }
+
+ vu_init(&vdev_blk->vu_dev,
+ cli_sock,
+ vu_blk_panic_cb,
+ vu_blk_add_watch_cb,
+ vu_blk_del_watch_cb,
+ &vu_blk_iface);
+
+ if (vu_blk_gsrc_new(vdev_blk, cli_sock, G_IO_IN, NULL, vu_blk_vhost_cb,
+ &vdev_blk->vu_dev)) {
+ ret = -1;
+ goto out;
+ }
+
+ g_main_loop_run(vdev_blk->loop);
+
+out:
+ vu_deinit(&vdev_blk->vu_dev);
+ return ret;
+}
+
+static void vdev_blk_deinit(struct vhost_blk_dev *vdev_blk)
+{
+ if (!vdev_blk) {
+ return;
+ }
+
+ if (vdev_blk->server_sock >= 0) {
+ struct sockaddr_storage ss;
+ socklen_t sslen = sizeof(ss);
+
+ if (getsockname(vdev_blk->server_sock, (struct sockaddr *)&ss,
+ &sslen) == 0) {
+ struct sockaddr_un *su = (struct sockaddr_un *)&ss;
+ (void)unlink(su->sun_path);
+ }
+
+ (void)close(vdev_blk->server_sock);
+ vdev_blk->server_sock = -1;
+ }
+
+ if (vdev_blk->loop) {
+ g_main_loop_unref(vdev_blk->loop);
+ vdev_blk->loop = NULL;
+ }
+
+ if (vdev_blk->blk_fd) {
+ vu_blk_close(vdev_blk->blk_fd);
+ }
+}
+
+static struct vhost_blk_dev *
+vdev_blk_new(char *unix_fn, char *blk_file)
+{
+ struct vhost_blk_dev *vdev_blk = NULL;
+
+ vdev_blk = calloc(1, sizeof(struct vhost_blk_dev));
+ if (!vdev_blk) {
+ fprintf(stderr, "calloc: %s", strerror(errno));
+ return NULL;
+ }
+
+ vdev_blk->server_sock = unix_sock_new(unix_fn);
+ if (vdev_blk->server_sock < 0) {
+ goto err;
+ }
+
+ vdev_blk->loop = g_main_loop_new(NULL, FALSE);
+ if (!vdev_blk->loop) {
+ fprintf(stderr, "Error creating glib event loop");
+ goto err;
+ }
+
+ vdev_blk->fdmap = g_tree_new(vu_blk_fdmap_compare);
+ if (!vdev_blk->fdmap) {
+ fprintf(stderr, "Error creating glib tree for fdmap");
+ goto err;
+ }
+
+ vdev_blk->blk_fd = vu_blk_open(blk_file);
+ if (vdev_blk->blk_fd < 0) {
+ fprintf(stderr, "Error open block device %s\n", blk_file);
+ goto err;
+ }
+ vdev_blk->blk_name = blk_file;
+
+ return vdev_blk;
+
+err:
+ vdev_blk_deinit(vdev_blk);
+ free(vdev_blk);
+
+ return NULL;
+}
+
+int main(int argc, char **argv)
+{
+ int opt;
+ char *unix_socket = NULL;
+ char *blk_file = NULL;
+ struct vhost_blk_dev *vdev_blk = NULL;
+
+ while ((opt = getopt(argc, argv, "b:h:s:")) != -1) {
+ switch (opt) {
+ case 'b':
+ blk_file = strdup(optarg);
+ break;
+ case 's':
+ unix_socket = strdup(optarg);
+ break;
+ case 'h':
+ default:
+ printf("Usage: %s [-b block device or file, -s UNIX domain socket]"
+ " | [ -h ]\n", argv[0]);
+ break;
+ }
+ }
+
+ if (!unix_socket || !blk_file) {
+ printf("Usage: %s [-b block device or file, -s UNIX domain socket] |"
+ " [ -h ]\n", argv[0]);
+ return -1;
+ }
+
+ vdev_blk = vdev_blk_new(unix_socket, blk_file);
+ if (!vdev_blk) {
+ goto err;
+ }
+
+ if (vdev_blk_run(vdev_blk) != 0) {
+ goto err;
+ }
+
+err:
+ if (vdev_blk) {
+ vdev_blk_deinit(vdev_blk);
+ free(vdev_blk);
+ }
+ if (unix_socket) {
+ free(unix_socket);
+ }
+ if (blk_file) {
+ free(blk_file);
+ }
+
+ return 0;
+}
+
This commit introcudes a vhost-user-blk backend device, it uses UNIX domain socket to communicate with Qemu. The vhost-user-blk sample application should be used with Qemu vhost-user-blk-pci device. To use it, complie with: make vhost-user-blk and start like this: vhost-user-blk -b /dev/sdb -s /path/vhost.socket Signed-off-by: Changpeng Liu <changpeng.liu@intel.com> --- .gitignore | 1 + Makefile | 3 + Makefile.objs | 2 + contrib/vhost-user-blk/Makefile.objs | 1 + contrib/vhost-user-blk/vhost-user-blk.c | 695 ++++++++++++++++++++++++++++++++ 5 files changed, 702 insertions(+) create mode 100644 contrib/vhost-user-blk/Makefile.objs create mode 100644 contrib/vhost-user-blk/vhost-user-blk.c