vhost-user-blk could have played as vhost-user backend but it only supports raw
file and don't support VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES
operations on raw file (ioctl(fd, BLKDISCARD) is only valid for real
block device).
Kevin's qemu-storage-daemon will be used to replace this
tool after his patches are merged into the mainline QEMU.
Signed-off-by: Coiby Xu <coiby...@gmail.com>
---
Makefile | 4 +
configure | 3 +
qemu-vu.c | 252 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 259 insertions(+)
create mode 100644 qemu-vu.c
diff --git a/Makefile b/Makefile
index 9d4b224126..6da192222d 100644
--- a/Makefile
+++ b/Makefile
@@ -585,6 +585,10 @@ qemu-img.o: qemu-img-cmds.h
qemu-img$(EXESUF): qemu-img.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y)
$(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
qemu-nbd$(EXESUF): qemu-nbd.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y)
$(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
+
+ifdef CONFIG_LINUX
+qemu-vu$(EXESUF): qemu-vu.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y)
$(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
+endif
qemu-io$(EXESUF): qemu-io.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y)
$(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o $(COMMON_LDADDS)
diff --git a/configure b/configure
index fab6281eb7..53dd9fb88f 100755
--- a/configure
+++ b/configure
@@ -6318,6 +6318,9 @@ if test "$want_tools" = "yes" ; then
if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" ] ; then
tools="qemu-nbd\$(EXESUF) $tools"
fi
+ if [ "$linux" = "yes" ] ; then
+ tools="qemu-vu\$(EXESUF) $tools"
+ fi
if [ "$ivshmem" = "yes" ]; then
tools="ivshmem-client\$(EXESUF) ivshmem-server\$(EXESUF) $tools"
fi
diff --git a/qemu-vu.c b/qemu-vu.c
new file mode 100644
index 0000000000..3d2e4df5eb
--- /dev/null
+++ b/qemu-vu.c
@@ -0,0 +1,252 @@
+/*
+ * Copyright (C) 2020 Coiby Xu <coiby...@gmail.com>
+ *
+ * standone-alone vhost-user-blk device server backend
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include <getopt.h>
+#include <libgen.h>
+#include "block/export/vhost-user-blk-server.h"
+#include "block/block_int.h"
+#include "io/net-listener.h"
+#include "qapi/error.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qstring.h"
+#include "qemu/config-file.h"
+#include "qemu/cutils.h"
+#include "qemu/main-loop.h"
+#include "qemu/module.h"
+#include "qemu/option.h"
+#include "qemu-common.h"
+#include "qemu-version.h"
+#include "qom/object_interfaces.h"
+#include "sysemu/block-backend.h"
+#define QEMU_VU_OPT_CACHE 256
+#define QEMU_VU_OPT_AIO 257
+#define QEMU_VU_OBJ_ID "vu_disk"
+static QemuOptsList qemu_object_opts = {
+ .name = "object",
+ .implied_opt_name = "qom-type",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
+ .desc = {
+ { }
+ },
+};
+static char *srcpath;
+
+static void usage(const char *name)
+{
+ (printf) (
+"Usage: %s [OPTIONS] FILE\n"
+" or: %s -L [OPTIONS]\n"
+"QEMU Vhost-user Server Utility\n"
+"\n"
+" -h, --help display this help and exit\n"
+" -V, --version output version information and exit\n"
+"\n"
+"Connection properties:\n"
+" -k, --socket=PATH path to the unix socket\n"
+"\n"
+"General purpose options:\n"
+" -e, -- exit-panic When the panic callback is called, the program\n"
+" will exit. Useful for make check-qtest.\n"
+"\n"
+"Block device options:\n"
+" -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
+" -r, --read-only export read-only\n"
+" -n, --nocache disable host cache\n"
+" --cache=MODE set cache mode (none, writeback, ...)\n"
+" --aio=MODE set AIO mode (native or threads)\n"
+"\n"
+QEMU_HELP_BOTTOM "\n"
+ , name, name);
+}
+
+static void version(const char *name)
+{
+ printf(
+"%s " QEMU_FULL_VERSION "\n"
+"Written by Coiby Xu, based on qemu-nbd by Anthony Liguori\n"
+"\n"
+QEMU_COPYRIGHT "\n"
+"This is free software; see the source for copying conditions. There is NO\n"
+"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
+ , name);
+}
+
+static VuBlockDev *vu_block_device;
+
+static void vus_shutdown(void)
+{
+
+ Error *local_err = NULL;
+ job_cancel_sync_all();
+ bdrv_close_all();
+ user_creatable_del(QEMU_VU_OBJ_ID, &local_err);
+}
+
+int main(int argc, char **argv)
+{
+ BlockBackend *blk;
+ BlockDriverState *bs;
+ bool readonly = false;
+ char *sockpath = NULL;
+ const char *sopt = "hVrnvek:f:";
+ struct option lopt[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, 'V' },
+ { "exit-panic", no_argument, NULL, 'e' },
+ { "socket", required_argument, NULL, 'k' },
+ { "read-only", no_argument, NULL, 'r' },
+ { "nocache", no_argument, NULL, 'n' },
+ { "cache", required_argument, NULL, QEMU_VU_OPT_CACHE },
+ { "aio", required_argument, NULL, QEMU_VU_OPT_AIO },
+ { "format", required_argument, NULL, 'f' },
+ { NULL, 0, NULL, 0 }
+ };
+ int ch;
+ int opt_ind = 0;
+ int flags = BDRV_O_RDWR;
+ bool seen_cache = false;
+ bool seen_aio = false;
+ const char *fmt = NULL;
+ Error *local_err = NULL;
+ QDict *options = NULL;
+ bool writethrough = true;
+ bool exit_when_panic = false;
+
+ error_init(argv[0]);
+
+ module_call_init(MODULE_INIT_QOM);
+ qemu_init_exec_dir(argv[0]);
+
+ while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
+ switch (ch) {
+ case 'e':
+ exit_when_panic = true;
+ break;
+ case 'n':
+ optarg = (char *) "none";
+ /* fallthrough */
+ case QEMU_VU_OPT_CACHE:
+ if (seen_cache) {
+ error_report("-n and --cache can only be specified once");
+ exit(EXIT_FAILURE);
+ }
+ seen_cache = true;
+ if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) {
+ error_report("Invalid cache mode `%s'", optarg);
+ exit(EXIT_FAILURE);
+ }
+ break;
+ case QEMU_VU_OPT_AIO:
+ if (seen_aio) {
+ error_report("--aio can only be specified once");
+ exit(EXIT_FAILURE);
+ }
+ seen_aio = true;
+ if (!strcmp(optarg, "native")) {
+ flags |= BDRV_O_NATIVE_AIO;
+ } else if (!strcmp(optarg, "threads")) {
+ /* this is the default */
+ } else {
+ error_report("invalid aio mode `%s'", optarg);
+ exit(EXIT_FAILURE);
+ }
+ break;
+ case 'r':
+ readonly = true;
+ flags &= ~BDRV_O_RDWR;
+ break;
+ case 'k':
+ sockpath = optarg;
+ if (sockpath[0] != '/') {
+ error_report("socket path must be absolute");
+ exit(EXIT_FAILURE);
+ }
+ break;
+ case 'f':
+ fmt = optarg;
+ break;
+ case 'V':
+ version(argv[0]);
+ exit(0);
+ break;
+ case 'h':
+ usage(argv[0]);
+ exit(0);
+ break;
+ case '?':
+ error_report("Try `%s --help' for more information.", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ if ((argc - optind) != 1) {
+ error_report("Invalid number of arguments");
+ error_printf("Try `%s --help' for more information.\n", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+ if (qemu_init_main_loop(&local_err)) {
+ error_report_err(local_err);
+ exit(EXIT_FAILURE);
+ }
+ bdrv_init();
+
+ srcpath = argv[optind];
+ if (fmt) {
+ options = qdict_new();
+ qdict_put_str(options, "driver", fmt);
+ }
+ blk = blk_new_open(srcpath, NULL, options, flags, &local_err);
+
+ if (!blk) {
+ error_reportf_err(local_err, "Failed to blk_new_open '%s': ",
+ argv[optind]);
+ exit(EXIT_FAILURE);
+ }
+ bs = blk_bs(blk);
+
+ char buf[300];
+ snprintf(buf, 300, "%s,id=%s,node-name=%s,unix-socket=%s,writable=%s",
+ TYPE_VHOST_USER_BLK_SERVER, QEMU_VU_OBJ_ID,
bdrv_get_node_name(bs),
+ sockpath, !readonly ? "on" : "off");
+ /* While calling user_creatable_del, 'object' group is required */
+ qemu_add_opts(&qemu_object_opts);
+ QemuOpts *opts = qemu_opts_parse(&qemu_object_opts, buf, true, &local_err);
+ if (local_err) {
+ error_report_err(local_err);
+ goto error;
+ }
+
+ Object *obj = user_creatable_add_opts(opts, &local_err);
+
+ if (local_err) {
+ error_report_err(local_err);
+ goto error;
+ }
+
+ vu_block_device = VHOST_USER_BLK_SERVER(obj);
+ vu_block_device->exit_when_panic = exit_when_panic;
+
+ do {
+ main_loop_wait(false);
+ } while (!vu_block_device->exit_when_panic ||
!vu_block_device->vu_server->close);
+
+ error:
+ vus_shutdown();
+ exit(EXIT_SUCCESS);
+}
--
2.25.1
