@@ -11,6 +11,17 @@
#include "block/block_int.h"
#include "qemu/uri.h"
+#define MAX_PORTNUM_SIZE 6 /* max port num 65535 */
+
+#define GLUSTER_OPT_FILENAME "filename"
+#define GLUSTER_OPT_VOLNAME "volname"
+#define GLUSTER_OPT_IMAGE_PATH "image-path"
+#define GLUSTER_OPT_SERVER "server"
+#define GLUSTER_OPT_PORT "port"
+#define GLUSTER_OPT_TRANSPORT "transport"
+#define GLUSTER_OPT_READ_PATTERN "backup-volfile-servers."
+
+
typedef struct GlusterAIOCB {
int64_t size;
int ret;
@@ -26,7 +37,7 @@ typedef struct BDRVGlusterState {
typedef struct GlusterConf {
char *server;
- int port;
+ char *port;
char *volname;
char *image;
char *transport;
@@ -39,10 +50,65 @@ static void qemu_gluster_gconf_free(GlusterConf *gconf)
g_free(gconf->volname);
g_free(gconf->image);
g_free(gconf->transport);
+ g_free(gconf->port);
g_free(gconf);
}
}
+static QemuOptsList runtime_opts = {
+ .name = "gluster",
+ .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+ .desc = {
+ {
+ .name = GLUSTER_OPT_FILENAME,
+ .type = QEMU_OPT_STRING,
+ .help = "URL to the gluster image",
+ },
+ { /* end of list */ }
+ },
+};
+
+static QemuOptsList runtime_json_opts = {
+ .name = "gluster_json",
+ .head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head),
+ .desc = {
+ {
+ .name = GLUSTER_OPT_VOLNAME,
+ .type = QEMU_OPT_STRING,
+ .help = "name of gluster volume where our VM image resides",
+ },
+ {
+ .name = GLUSTER_OPT_IMAGE_PATH,
+ .type = QEMU_OPT_STRING,
+ .help = "absolute path to image file in gluster volume",
+ },
+ { /* end of list */ }
+ },
+};
+
+static QemuOptsList runtime_tuple_opts = {
+ .name = "gluster_tuple",
+ .head = QTAILQ_HEAD_INITIALIZER(runtime_tuple_opts.head),
+ .desc = {
+ {
+ .name = GLUSTER_OPT_SERVER,
+ .type = QEMU_OPT_STRING,
+ .help = "server address (hostname/ipv4/ipv6 addresses)",
+ },
+ {
+ .name = GLUSTER_OPT_PORT,
+ .type = QEMU_OPT_STRING,
+ .help = "port number on which glusterd is listening(default 24007)",
+ },
+ {
+ .name = GLUSTER_OPT_TRANSPORT,
+ .type = QEMU_OPT_STRING,
+ .help = "transport type used to connect to glusterd(default tcp)",
+ },
+ { /* end of list */ }
+ },
+};
+
static int parse_volume_options(GlusterConf *gconf, char *path)
{
char *p, *q;
@@ -105,6 +171,7 @@ static int parse_volume_options(GlusterConf *gconf, char *path)
* file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
* file=gluster+rdma://1.2.3.4:24007/testvol/a.img
*/
+
static int qemu_gluster_parseuri(GlusterConf *gconf, const char *filename)
{
URI *uri;
@@ -155,7 +222,8 @@ static int qemu_gluster_parseuri(GlusterConf *gconf, const char *filename)
gconf->server = g_strdup(qp->p[0].value);
} else {
gconf->server = g_strdup(uri->server ? uri->server : "localhost");
- gconf->port = uri->port;
+ gconf->port = g_malloc(MAX_PORTNUM_SIZE);
+ snprintf(gconf->port, MAX_PORTNUM_SIZE, "%d", uri->port);
}
out:
@@ -166,30 +234,25 @@ out:
return ret;
}
-static struct glfs *qemu_gluster_init(GlusterConf *gconf, const char *filename,
- Error **errp)
+static struct glfs *qemu_gluster_glfs_init(GlusterConf *gconf, int num_servers,
+ Error **errp)
{
struct glfs *glfs = NULL;
- int ret;
int old_errno;
-
- ret = qemu_gluster_parseuri(gconf, filename);
- if (ret < 0) {
- error_setg(errp, "Usage: file=gluster[+transport]://[server[:port]]/"
- "volname/image[?socket=...]");
- errno = -ret;
- goto out;
- }
+ int ret = 0;
+ int i = 0;
glfs = glfs_new(gconf->volname);
if (!glfs) {
goto out;
}
- ret = glfs_set_volfile_server(glfs, gconf->transport, gconf->server,
- gconf->port);
- if (ret < 0) {
- goto out;
+ for (i = 0; i < num_servers; i++) {
+ ret = glfs_set_volfile_server(glfs, gconf[i].transport, gconf[i].server,
+ atoi(gconf[i].port));
+ if (ret < 0) {
+ goto out;
+ }
}
/*
@@ -204,15 +267,12 @@ static struct glfs *qemu_gluster_init(GlusterConf *gconf, const char *filename,
ret = glfs_init(glfs);
if (ret) {
error_setg_errno(errp, errno,
- "Gluster connection failed for server=%s port=%d "
- "volume=%s image=%s transport=%s", gconf->server,
- gconf->port, gconf->volname, gconf->image,
- gconf->transport);
+ "Gluster connection failed for volname=%s image=%s",
+ gconf->volname, gconf->image);
/* glfs_init sometimes doesn't set errno although docs suggest that */
if (errno == 0)
errno = EINVAL;
-
goto out;
}
return glfs;
@@ -226,6 +286,273 @@ out:
return NULL;
}
+
+static struct glfs *qemu_gluster_init(GlusterConf *gconf, const char *filename,
+ Error **errp)
+{
+ struct glfs *glfs = NULL;
+ int ret;
+
+ ret = qemu_gluster_parseuri(gconf, filename);
+ if (ret < 0) {
+ error_setg(errp, "Usage: file=gluster[+transport]://[server[:port]]/"
+ "volname/image[?socket=...]");
+ errno = -ret;
+ goto out;
+ }
+
+ glfs = qemu_gluster_glfs_init(gconf, 1, errp);
+ if (!glfs) {
+ goto out;
+ }
+ return glfs;
+
+out:
+ return NULL;
+}
+
+/*
+*
+* Basic command line syntax looks like:
+*
+* Pattern I:
+* -drive driver=gluster,
+* volname=testvol,file.image-path=/path/a.raw,
+* backup-volfile-servers.0.server=1.2.3.4,
+* [backup-volfile-servers.0.port=24007,]
+* [backup-volfile-servers.0.transport=tcp,]
+* backup-volfile-servers.1.server=5.6.7.8,
+* [backup-volfile-servers.1.port=24008,]
+* [backup-volfile-servers.1.transport=rdma,] ...
+*
+* Pattern II:
+* 'json:{"driver":"qcow2","file":{"driver":"gluster",
+* "volname":"testvol","image-path":"/path/a.qcow2",
+* "backup-volfile-servers":[{tuple0},{tuple1}, ...{tupleN}]}}'
+*
+*
+* driver => 'gluster' (protocol name)
+* volname => name of gluster volume where our VM image resides
+* image-path => is the absolute path of image in gluster volume
+*
+* {tuple} => {"server":"1.2.3.4"[,"port":"24007","transport":"tcp"]}
+*
+* server => server address (hostname/ipv4/ipv6 addresses)
+* port => port number on which glusterd is listening. (default 24007)
+* tranport => transport type used to connect to gluster management daemon,
+* it can be tcp|rdma (default 'tcp')
+*
+*
+* Examples:
+* Pattern I:
+* -drive driver=qcow2,file.driver=gluster,
+* file.volname=testvol,file.image-path=/path/a.qcow2,
+* file.backup-volfile-servers.0.server=1.2.3.4,
+* file.backup-volfile-servers.0.port=24007,
+* file.backup-volfile-servers.0.transport=tcp,
+* file.backup-volfile-servers.1.server=5.6.7.8,
+* file.backup-volfile-servers.1.port=24008,
+* file.backup-volfile-servers.1.transport=rdma, ...
+*
+* -drive driver=qcow2,file.driver=gluster,
+* file.volname=testvol,file.image-path=/path/a.qcow2,
+* file.backup-volfile-servers.0.server=1.2.3.4,
+* file.backup-volfile-servers.1.server=5.6.7.8, ...
+*
+* -drive driver=qcow2,file.driver=gluster,
+* file.volname=testvol,file.image-path=/path/a.qcow2,
+* file.backup-volfile-servers.0.server=1.2.3.4,
+* file.backup-volfile-servers.0.port=24007,
+* file.backup-volfile-servers.1.server=5.6.7.8,
+* file.backup-volfile-servers.1.port=24008, ...
+*
+* -drive driver=qcow2,file.driver=gluster,
+* file.volname=testvol,file.image-path=/path/a.qcow2,
+* file.backup-volfile-servers.0.server=1.2.3.4,
+* file.backup-volfile-servers.0.transport=tcp,
+* file.backup-volfile-servers.1.server=5.6.7.8,
+* file.backup-volfile-servers.1.transport=rdma, ...
+*
+* Pattern II:
+* 'json:{"driver":"qcow2","file":{"driver":"gluster","volname":"testvol",
+* "image-path":"/path/a.qcow2","backup-volfile-servers":
+* [{"server":"1.2.3.4","port":"24007","transport":"tcp"},
+* {"server":"4.5.6.7","port":"24008","transport":"rdma"}, ...]}}'
+*
+* 'json:{"driver":"qcow2","file":{"driver":"gluster","volname":"testvol",
+* "image-path":"/path/a.qcow2","backup-volfile-servers":
+* [{"server":"1.2.3.4"},
+* {"server":"4.5.6.7"}, ...]}}'
+*
+*
+* 'json:{"driver":"qcow2","file":{"driver":"gluster","volname":"testvol",
+* "image-path":"/path/a.qcow2","backup-volfile-servers":
+* [{"server":"1.2.3.4","port":"24007"},
+* {"server":"4.5.6.7","port":"24008"}, ...]}}'
+*
+*
+* 'json:{"driver":"qcow2","file":{"driver":"gluster","volname":"testvol",
+* "image-path":"/path/a.qcow2","backup-volfile-servers":
+* [{"server":"1.2.3.4","transport":"tcp"},
+* {"server":"4.5.6.7","transport":"rdma"}, ...]}}'
+*
+* Just for better readability pattern II is kept as:
+* json:
+* {
+* "driver":"qcow2",
+* "file":{
+* "driver":"gluster",
+* "volname":"testvol",
+* "image-path":"/path/a.qcow2",
+* "backup-volfile-servers":[
+* {
+* "server":"1.2.3.4",
+* "port":"24007",
+* "transport":"tcp"
+* },
+* {
+* "server":"5.6.7.8",
+* "port":"24008",
+* "transport":"rdma"
+* }
+* ]
+* }
+* }
+*
+*/
+
+static int qemu_gluster_parseopts(GlusterConf **pgconf, QDict *options,
+ Error **errp)
+{
+ QemuOpts *opts;
+ GlusterConf *gconf = NULL;
+ QDict *backing_options;
+ Error *local_err = NULL;
+ char *str = NULL;
+ int num_servers = 0;
+ int ret = 0;
+ int i = 0;
+
+ /* parse options in dict */
+ opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort);
+ qemu_opts_absorb_qdict(opts, options, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+ num_servers = qdict_array_entries(options, GLUSTER_OPT_READ_PATTERN);
+ if (num_servers < 1) {
+ error_setg(&local_err, "\n\n ********* qemu_gluster: "
+ "please provide 'backup-volfile-server' option "
+ "with valid fields in array of tuples *********\n");
+ error_report_err(local_err);
+ goto out;
+ }
+
+ gconf = g_new0(GlusterConf, num_servers);
+
+ gconf->volname = (char *) qemu_opt_get(opts, GLUSTER_OPT_VOLNAME);
+ if (!gconf->volname) {
+ error_setg(&local_err, "\n\n ********* qemu_gluster: "
+ "please provide 'volname'option *********\n");
+ error_report_err(local_err);
+ goto out;
+ }
+ gconf->image = (char *) qemu_opt_get(opts, GLUSTER_OPT_IMAGE_PATH);
+ if (!gconf->image) {
+ error_setg(&local_err, "\n\n ********* qemu_gluster: "
+ "please provide 'image-path' option *********\n");
+ error_report_err(local_err);
+ goto out;
+ }
+ opts = qemu_opts_create(&runtime_tuple_opts, NULL, 0, &error_abort);
+ for (i = 0; i < num_servers; i++) {
+ if (i > 0) {
+ gconf[i].volname = gconf->volname;
+ gconf[i].image = gconf->image;
+ }
+ str = g_malloc(40);
+ snprintf(str, 40, GLUSTER_OPT_READ_PATTERN"%d.", i);
+ qdict_extract_subqdict(options, &backing_options, str);
+ g_free(str);
+ qemu_opts_absorb_qdict(opts, backing_options, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ goto out;
+ }
+ gconf[i].server = (char *) qemu_opt_get(opts, GLUSTER_OPT_SERVER);
+ if (!gconf[i].server) {
+ error_setg(&local_err, "\n\n ********* qemu_gluster: "
+ "backup-volfile-servers.{tuple.%d} requires 'server' "
+ "option *********\n", i);
+ error_report_err(local_err);
+ goto out;
+ }
+ gconf[i].transport = (char *) qemu_opt_get(opts, GLUSTER_OPT_TRANSPORT);
+ if (!gconf[i].transport) {
+ gconf[i].transport = (char *)"tcp";
+ }
+ gconf[i].port = (char *) qemu_opt_get(opts, GLUSTER_OPT_PORT);
+ if (!gconf[i].port) {
+ gconf[i].port = (char *)"24007";
+ }
+
+ /*
+ * reset current tuple opts to NULL, so that in case if the next tuple
+ * misses any of (server, tranport, port) options there is no chance of
+ * copying from current set.
+ */
+ qemu_opt_set(opts, GLUSTER_OPT_PORT, NULL, &error_abort);
+ qemu_opt_set(opts, GLUSTER_OPT_TRANSPORT, NULL, &error_abort);
+ qemu_opt_set(opts, GLUSTER_OPT_SERVER, NULL, &error_abort);
+ }
+ *pgconf = gconf;
+ return num_servers;
+
+out:
+ ret = -EINVAL;
+ errno = -ret;
+ qemu_opts_del(opts);
+ return ret;
+}
+
+static struct glfs *qemu_gluster_opts_init(GlusterConf **pgconf,
+ QDict *options, Error **errp)
+{
+ struct glfs *glfs = NULL;
+ int num_servers = 0;
+
+ num_servers = qemu_gluster_parseopts(pgconf, options, errp);
+ if (num_servers < 1) {
+ error_setg(errp, "\n"
+ "\n#Usage1:\n"
+ "-drive driver=qcow2,file.driver=gluster,"
+ "file.volname=testvol,file.image-path=/path/a.qcow2,"
+ "file.backup-volfile-servers.0.server=1.2.3.4,"
+ "[file.backup-volfile-servers.0.port=24007,]"
+ "[file.backup-volfile-servers.0.transport=tcp,]"
+ "file.backup-volfile-servers.1.server=5.6.7.8,"
+ "[file.backup-volfile-servers.1.port=24008,]"
+ "[file.backup-volfile-servers.1.transport=rdma,] ...\n"
+ "\n#Usage2:\n'json:{\"driver\":\"qcow2\",\"file\":"
+ "{\"driver\":\"gluster\",\"volname\":\""
+ "testvol\",\"image-path\":\"/path/a.qcow2\","
+ "\"backup-volfile-servers\":[{\"server\":\"1.2.3.4\","
+ "\"port\":\"24007\",\"transport\":\"tcp\"},"
+ "{\"server\":\"4.5.6.7\",\"port\":\"24007\","
+ "\"transport\":\"rdma\"}, ...]}}'\n");
+ goto out;
+ }
+ glfs = qemu_gluster_glfs_init(*pgconf, num_servers, errp);
+ if (!glfs) {
+ goto out;
+ }
+ return glfs;
+
+out:
+ return NULL;
+}
+
static void qemu_gluster_complete_aio(void *opaque)
{
GlusterAIOCB *acb = (GlusterAIOCB *)opaque;
@@ -254,20 +581,6 @@ static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
qemu_bh_schedule(acb->bh);
}
-/* TODO Convert to fine grained options */
-static QemuOptsList runtime_opts = {
- .name = "gluster",
- .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
- .desc = {
- {
- .name = "filename",
- .type = QEMU_OPT_STRING,
- .help = "URL to the gluster image",
- },
- { /* end of list */ }
- },
-};
-
static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags)
{
assert(open_flags != NULL);
@@ -291,11 +604,12 @@ static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
BDRVGlusterState *s = bs->opaque;
int open_flags = 0;
int ret = 0;
- GlusterConf *gconf = g_new0(GlusterConf, 1);
+ GlusterConf *gconf = NULL;
QemuOpts *opts;
Error *local_err = NULL;
- const char *filename;
+ const char *filename = NULL;
+ qdict_flatten(options);
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
@@ -305,8 +619,12 @@ static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
}
filename = qemu_opt_get(opts, "filename");
-
- s->glfs = qemu_gluster_init(gconf, filename, errp);
+ if (filename) {
+ gconf = g_new0(GlusterConf, 1);
+ s->glfs = qemu_gluster_init(gconf, filename, errp);
+ } else {
+ s->glfs = qemu_gluster_opts_init(&gconf, options, errp);
+ }
if (!s->glfs) {
ret = -errno;
goto out;
@@ -321,7 +639,11 @@ static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
out:
qemu_opts_del(opts);
- qemu_gluster_gconf_free(gconf);
+ if (filename) {
+ qemu_gluster_gconf_free(gconf);
+ } else {
+ g_free(gconf);
+ }
if (!ret) {
return ret;
}
@@ -339,7 +661,6 @@ typedef struct BDRVGlusterReopenState {
struct glfs_fd *fd;
} BDRVGlusterReopenState;
-
static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
BlockReopenQueue *queue, Error **errp)
{
@@ -401,7 +722,6 @@ static void qemu_gluster_reopen_commit(BDRVReopenState *state)
return;
}
-
static void qemu_gluster_reopen_abort(BDRVReopenState *state)
{
BDRVGlusterReopenState *reop_s = state->opaque;
@@ -718,7 +1038,7 @@ static BlockDriver bdrv_gluster = {
.format_name = "gluster",
.protocol_name = "gluster",
.instance_size = sizeof(BDRVGlusterState),
- .bdrv_needs_filename = true,
+ .bdrv_needs_filename = false,
.bdrv_file_open = qemu_gluster_open,
.bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
@@ -745,7 +1065,7 @@ static BlockDriver bdrv_gluster_tcp = {
.format_name = "gluster",
.protocol_name = "gluster+tcp",
.instance_size = sizeof(BDRVGlusterState),
- .bdrv_needs_filename = true,
+ .bdrv_needs_filename = false,
.bdrv_file_open = qemu_gluster_open,
.bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
@@ -799,7 +1119,7 @@ static BlockDriver bdrv_gluster_rdma = {
.format_name = "gluster",
.protocol_name = "gluster+rdma",
.instance_size = sizeof(BDRVGlusterState),
- .bdrv_needs_filename = true,
+ .bdrv_needs_filename = false,
.bdrv_file_open = qemu_gluster_open,
.bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
@@ -1382,7 +1382,7 @@
'data': [ 'archipelago', 'blkdebug', 'blkverify', 'bochs', 'cloop',
'dmg', 'file', 'ftp', 'ftps', 'host_cdrom', 'host_device',
'host_floppy', 'http', 'https', 'null-aio', 'null-co', 'parallels',
- 'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'tftp', 'vdi', 'vhdx',
+ 'qcow', 'qcow2', 'qed', 'quorum', 'gluster', 'raw', 'tftp', 'vdi', 'vhdx',
'vmdk', 'vpc', 'vvfat' ] }
##
@@ -1794,6 +1794,43 @@
'*read-pattern': 'QuorumReadPattern' } }
##
+# @GlusterTuplePattern
+#
+# Gluster tuple pattern
+#
+# @transport: #transport type used to connect to gluster management daemon
+# it can be tcp|rdma (default 'tcp')
+#
+# @port: port number on which glusterd is listening. (default 24007)
+#
+# @server: server address (hostname/ipv4/ipv6 addresses)
+#
+# Since: 2.4+
+##
+{ 'struct': 'GlusterTuplePattern',
+ 'data': { 'server': 'str',
+ 'transport': 'str',
+ 'port': 'str' } }
+
+##
+# @BlockdevOptionsGluster
+#
+# Driver specific block device options for Gluster
+#
+# @volname: name of gluster volume where our VM image resides
+#
+# @image-path: absolute path to image file in gluster volume
+#
+# @backup-volfile-servers: holds multiple tuples of {server, transport, port}
+#
+# Since: 2.4+
+##
+{ 'struct': 'BlockdevOptionsGluster',
+ 'data': { 'volname': 'str',
+ 'image-path': 'str',
+ 'backup-volfile-servers': [ 'GlusterTuplePattern' ] } }
+
+##
# @BlockdevOptions
#
# Options for creating a block device.
@@ -1814,6 +1851,7 @@
'ftp': 'BlockdevOptionsFile',
'ftps': 'BlockdevOptionsFile',
# TODO gluster: Wait for structured options
+ 'gluster': 'BlockdevOptionsGluster',
'host_cdrom': 'BlockdevOptionsFile',
'host_device':'BlockdevOptionsFile',
'host_floppy':'BlockdevOptionsFile',
This patch adds a way to specify multiple backup volfile servers to the gluster block backend of QEMU with tcp|rdma transport types and their port numbers. Problem: Currenly VM Image on gluster volume is specified like this: file=gluster[+tcp]://server1[:port]/testvol/a.img Assuming we have have three servers in trustred pool with replica 3 volume in action and unfortunately server1 (mentioned in the command above) went down for some reason, since the volume is replica 3 we now have other 2 servers active from which we can boot the VM. But currently there is no mechanism to pass the other 2 gluster server addresses to qemu. Solution: New way of specifying VM Image on gluster volume with backup volfile servers: (We still support old syntax to maintain backward compatibility) Basic command line syntax looks like: Pattern I: -drive driver=gluster, volname=testvol,file.image-path=/path/a.raw, backup-volfile-servers.0.server=1.2.3.4, [backup-volfile-servers.0.port=24007,] [backup-volfile-servers.0.transport=tcp,] backup-volfile-servers.1.server=5.6.7.8, [backup-volfile-servers.1.port=24008,] [backup-volfile-servers.1.transport=rdma,] ... Pattern II: 'json:{"driver":"qcow2","file":{"driver":"gluster", "volname":"testvol","image-path":"/path/a.qcow2", "backup-volfile-servers":[{tuple0},{tuple1}, ...{tupleN}]}}' driver => 'gluster' (protocol name) volname => name of gluster volume where our VM image resides image-path => is the absolute path of image in gluster volume {tuple} => {"server":"1.2.3.4"[,"port":"24007","transport":"tcp"]} server => server address (hostname/ipv4/ipv6 addresses) port => port number on which glusterd is listening. (default 24007) tranport => transport type used to connect to gluster management daemon, it can be tcp|rdma (default 'tcp') Examples: 1. -drive driver=qcow2,file.driver=gluster, file.volname=testvol,file.image-path=/path/a.qcow2, file.backup-volfile-servers.0.server=1.2.3.4, file.backup-volfile-servers.0.port=24007, file.backup-volfile-servers.0.transport=tcp, file.backup-volfile-servers.1.server=5.6.7.8, file.backup-volfile-servers.1.port=24008, file.backup-volfile-servers.1.transport=rdma 2. 'json:{"driver":"qcow2","file":{"driver":"gluster","volname":"testvol", "image-path":"/path/a.qcow2","backup-volfile-servers": [{"server":"1.2.3.4","port":"24007","transport":"tcp"}, {"server":"4.5.6.7","port":"24008","transport":"rdma"},] } }' This patch gives a mechanism to provide all the server addresses which are in replica set, so in case server1 is down VM can still boot from any of the active servers. This is equivalent to the backup-volfile-servers option supported by mount.glusterfs (FUSE way of mounting gluster volume) This patch depends on a recent fix in libgfapi raised as part of this work: http://review.gluster.org/#/c/12114/ (not merged yet) Credits: Sincere thanks to Kevin Wolf <kwolf@redhat.com> and "Deepak C Shetty" <deepakcs@redhat.com> for inputs and all their support v1: multiple server addresses but common port number and transport type pattern: URI syntax with query (?) delimitor syntax: file=gluster[+transport-type]://server1:24007/testvol/a.img\ ?backup-volfile-servers=server2&backup-volfile-servers=server3 v2: multiple server addresses each have their own port number, but all use common transport type pattern: URI syntax with query (?) delimiter syntax: file=gluster[+transport-type]://[server[:port]]/testvol/a.img\ [?backup-volfile-servers=server1[:port]\ &backup-volfile-servers=server2[:port]] v3: multiple server addresses each have their own port number and transport type pattern: changed to json syntax: 'json:{"driver":"qcow2","file":{"driver":"gluster","volname":"testvol", "image-path":"/path/a.qcow2","backup-volfile-servers": [{"server":"1.2.3.4","port":"24007","transport":"tcp"}, {"server":"4.5.6.7","port":"24008","transport":"rdma"},] } }' Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com> --- block/gluster.c | 412 +++++++++++++++++++++++++++++++++++++++++++++------ qapi/block-core.json | 40 ++++- 2 files changed, 405 insertions(+), 47 deletions(-)