block/gluster: add support for multiple gluster servers

This patch adds a way to specify multiple volfile servers to the gluster
block backend of QEMU with tcp|rdma transport types and their port numbers.

Problem:

Currently VM Image on gluster volume is specified like this:

file=gluster[+tcp]://host[:port]/testvol/a.img

Say we have three hosts in a trusted pool with replica 3 volume in action.
When the host mentioned in the command above goes down for some reason,
the other two hosts are still available. But there's currently no way
to tell QEMU about them.

Solution:

New way of specifying VM Image on gluster volume with volfile servers:
(We still support old syntax to maintain backward compatibility)

Basic command line syntax looks like:

Pattern I:
 -drive driver=gluster,
        volume=testvol,path=/path/a.raw,[debug=N,]
        server.0.type=tcp,
        server.0.host=1.2.3.4,
        server.0.port=24007,
        server.1.type=unix,
        server.1.socket=/path/socketfile

Pattern II:
 'json:{"driver":"qcow2","file":{"driver":"gluster",
       "volume":"testvol","path":"/path/a.qcow2",["debug":N,]
       "server":[{hostinfo_1}, ...{hostinfo_N}]}}'

   driver      => 'gluster' (protocol name)
   volume      => name of gluster volume where our VM image resides
   path        => absolute path of image in gluster volume
  [debug]      => libgfapi loglevel [(0 - 9) default 4 -> Error]

  {hostinfo}   => {{type:"tcp",host:"1.2.3.4"[,port=24007]},
                   {type:"unix",socket:"/path/sockfile"}}

   type        => transport type used to connect to gluster management daemon,
                  it can be tcp|unix
   host        => host address (hostname/ipv4/ipv6 addresses/socket path)
   port        => port number on which glusterd is listening.
   socket      => path to socket file

Examples:
1.
 -drive driver=qcow2,file.driver=gluster,
        file.volume=testvol,file.path=/path/a.qcow2,file.debug=9,
        file.server.0.type=tcp,
        file.server.0.host=1.2.3.4,
        file.server.0.port=24007,
        file.server.1.type=unix,
        file.server.1.socket=/var/run/glusterd.socket
2.
  'json:{"driver":"qcow2","file":{"driver":"gluster","volume":"testvol",
         "path":"/path/a.qcow2","debug":9,"server":
         [{"type":"tcp","host":"1.2.3.4","port":"24007"},
          {"type":"unix","socket":"/var/run/glusterd.socket"}
         ]}}'

This patch gives a mechanism to provide all the server addresses, which are in
replica set, so in case host1 is down VM can still boot from any of the
active hosts.

This is equivalent to the backup-volfile-servers option supported by
mount.glusterfs (FUSE way of mounting gluster volume)

credits: sincere thanks to all the supporters

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1468947453-5433-6-git-send-email-prasanna.kalever@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>

1 files changed, 357 insertions, 40 deletions

diff --git a/block/gluster.c b/block/gluster.c
index 80e68319ce..296bd9929e 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -11,15 +11,27 @@
 #include <glusterfs/api/glfs.h>
 #include "block/block_int.h"
 #include "qapi/error.h"
+#include "qapi/qmp/qerror.h"
 #include "qemu/uri.h"
 #include "qemu/error-report.h"
 
 #define GLUSTER_OPT_FILENAME        "filename"
+#define GLUSTER_OPT_VOLUME          "volume"
+#define GLUSTER_OPT_PATH            "path"
+#define GLUSTER_OPT_TYPE            "type"
+#define GLUSTER_OPT_SERVER_PATTERN  "server."
+#define GLUSTER_OPT_HOST            "host"
+#define GLUSTER_OPT_PORT            "port"
+#define GLUSTER_OPT_TO              "to"
+#define GLUSTER_OPT_IPV4            "ipv4"
+#define GLUSTER_OPT_IPV6            "ipv6"
+#define GLUSTER_OPT_SOCKET          "socket"
 #define GLUSTER_OPT_DEBUG           "debug"
 #define GLUSTER_DEFAULT_PORT        24007
 #define GLUSTER_DEBUG_DEFAULT       4
 #define GLUSTER_DEBUG_MAX           9
 
+#define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n"
 
 typedef struct GlusterAIOCB {
     int64_t size;
@@ -83,6 +95,92 @@ static QemuOptsList runtime_opts = {
     },
 };
 
+static QemuOptsList runtime_json_opts = {
+    .name = "gluster_json",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head),
+    .desc = {
+        {
+            .name = GLUSTER_OPT_VOLUME,
+            .type = QEMU_OPT_STRING,
+            .help = "name of gluster volume where VM image resides",
+        },
+        {
+            .name = GLUSTER_OPT_PATH,
+            .type = QEMU_OPT_STRING,
+            .help = "absolute path to image file in gluster volume",
+        },
+        {
+            .name = GLUSTER_OPT_DEBUG,
+            .type = QEMU_OPT_NUMBER,
+            .help = "Gluster log level, valid range is 0-9",
+        },
+        { /* end of list */ }
+    },
+};
+
+static QemuOptsList runtime_type_opts = {
+    .name = "gluster_type",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head),
+    .desc = {
+        {
+            .name = GLUSTER_OPT_TYPE,
+            .type = QEMU_OPT_STRING,
+            .help = "tcp|unix",
+        },
+        { /* end of list */ }
+    },
+};
+
+static QemuOptsList runtime_unix_opts = {
+    .name = "gluster_unix",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head),
+    .desc = {
+        {
+            .name = GLUSTER_OPT_SOCKET,
+            .type = QEMU_OPT_STRING,
+            .help = "socket file path)",
+        },
+        { /* end of list */ }
+    },
+};
+
+static QemuOptsList runtime_tcp_opts = {
+    .name = "gluster_tcp",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_tcp_opts.head),
+    .desc = {
+        {
+            .name = GLUSTER_OPT_TYPE,
+            .type = QEMU_OPT_STRING,
+            .help = "tcp|unix",
+        },
+        {
+            .name = GLUSTER_OPT_HOST,
+            .type = QEMU_OPT_STRING,
+            .help = "host address (hostname/ipv4/ipv6 addresses)",
+        },
+        {
+            .name = GLUSTER_OPT_PORT,
+            .type = QEMU_OPT_NUMBER,
+            .help = "port number on which glusterd is listening (default 24007)",
+        },
+        {
+            .name = "to",
+            .type = QEMU_OPT_NUMBER,
+            .help = "max port number, not supported by gluster",
+        },
+        {
+            .name = "ipv4",
+            .type = QEMU_OPT_BOOL,
+            .help = "ipv4 bool value, not supported by gluster",
+        },
+        {
+            .name = "ipv6",
+            .type = QEMU_OPT_BOOL,
+            .help = "ipv6 bool value, not supported by gluster",
+        },
+        { /* end of list */ }
+    },
+};
 
 static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path)
 {
@@ -155,7 +253,8 @@ static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf,
         return -EINVAL;
     }
 
-    gconf->server = gsconf = g_new0(GlusterServer, 1);
+    gconf->server = g_new0(GlusterServerList, 1);
+    gconf->server->value = gsconf = g_new0(GlusterServer, 1);
 
     /* transport */
     if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
@@ -212,39 +311,34 @@ out:
     return ret;
 }
 
-static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
-                                      const char *filename, Error **errp)
+static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf,
+                                           Error **errp)
 {
-    struct glfs *glfs = NULL;
+    struct glfs *glfs;
     int ret;
     int old_errno;
-
-    ret = qemu_gluster_parse_uri(gconf, filename);
-    if (ret < 0) {
-        error_setg(errp, "Invalid URI");
-        error_append_hint(errp, "Usage: file=gluster[+transport]://"
-                                "[host[:port]]/volume/path[?socket=...]\n");
-        errno = -ret;
-        goto out;
-    }
+    GlusterServerList *server;
 
     glfs = glfs_new(gconf->volume);
     if (!glfs) {
         goto out;
     }
 
-    if (gconf->server->type == GLUSTER_TRANSPORT_UNIX) {
-        ret = glfs_set_volfile_server(glfs,
-                                   GlusterTransport_lookup[gconf->server->type],
-                                   gconf->server->u.q_unix.path, 0);
-    } else {
-        ret = glfs_set_volfile_server(glfs,
-                                   GlusterTransport_lookup[gconf->server->type],
-                                   gconf->server->u.tcp.host,
-                                   atoi(gconf->server->u.tcp.port));
-    }
-    if (ret < 0) {
-        goto out;
+    for (server = gconf->server; server; server = server->next) {
+        if (server->value->type  == GLUSTER_TRANSPORT_UNIX) {
+            ret = glfs_set_volfile_server(glfs,
+                                   GlusterTransport_lookup[server->value->type],
+                                   server->value->u.q_unix.path, 0);
+        } else {
+            ret = glfs_set_volfile_server(glfs,
+                                   GlusterTransport_lookup[server->value->type],
+                                   server->value->u.tcp.host,
+                                   atoi(server->value->u.tcp.port));
+        }
+
+        if (ret < 0) {
+            goto out;
+        }
     }
 
     ret = glfs_set_logging(glfs, "-", gconf->debug_level);
@@ -254,18 +348,21 @@ static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
 
     ret = glfs_init(glfs);
     if (ret) {
-        if (gconf->server->type == GLUSTER_TRANSPORT_UNIX) {
-            error_setg(errp,
-                       "Gluster connection for volume %s, path %s failed on "
-                       "socket %s ", gconf->volume, gconf->path,
-                       gconf->server->u.q_unix.path);
-        } else {
-            error_setg(errp,
-                       "Gluster connection for volume %s, path %s failed on "
-                       "host  %s and port %s ", gconf->volume, gconf->path,
-                       gconf->server->u.tcp.host, gconf->server->u.tcp.port);
+        error_setg(errp, "Gluster connection for volume %s, path %s failed"
+                         " to connect", gconf->volume, gconf->path);
+        for (server = gconf->server; server; server = server->next) {
+            if (server->value->type  == GLUSTER_TRANSPORT_UNIX) {
+                error_append_hint(errp, "hint: failed on socket %s ",
+                                  server->value->u.q_unix.path);
+            } else {
+                error_append_hint(errp, "hint: failed on host %s and port %s ",
+                                  server->value->u.tcp.host,
+                                  server->value->u.tcp.port);
+            }
         }
 
+        error_append_hint(errp, "Please refer to gluster logs for more info\n");
+
         /* glfs_init sometimes doesn't set errno although docs suggest that */
         if (errno == 0) {
             errno = EINVAL;
@@ -284,6 +381,226 @@ out:
     return NULL;
 }
 
+static int qapi_enum_parse(const char *opt)
+{
+    int i;
+
+    if (!opt) {
+        return GLUSTER_TRANSPORT__MAX;
+    }
+
+    for (i = 0; i < GLUSTER_TRANSPORT__MAX; i++) {
+        if (!strcmp(opt, GlusterTransport_lookup[i])) {
+            return i;
+        }
+    }
+
+    return i;
+}
+
+/*
+ * Convert the json formatted command line into qapi.
+*/
+static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
+                                  QDict *options, Error **errp)
+{
+    QemuOpts *opts;
+    GlusterServer *gsconf;
+    GlusterServerList *curr = NULL;
+    QDict *backing_options = NULL;
+    Error *local_err = NULL;
+    char *str = NULL;
+    const char *ptr;
+    size_t num_servers;
+    int i;
+
+    /* create opts info from runtime_json_opts list */
+    opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (local_err) {
+        goto out;
+    }
+
+    num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN);
+    if (num_servers < 1) {
+        error_setg(&local_err, QERR_MISSING_PARAMETER, "server");
+        goto out;
+    }
+
+    ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME);
+    if (!ptr) {
+        error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME);
+        goto out;
+    }
+    gconf->volume = g_strdup(ptr);
+
+    ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
+    if (!ptr) {
+        error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH);
+        goto out;
+    }
+    gconf->path = g_strdup(ptr);
+    qemu_opts_del(opts);
+
+    for (i = 0; i < num_servers; i++) {
+        str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i);
+        qdict_extract_subqdict(options, &backing_options, str);
+
+        /* create opts info from runtime_type_opts list */
+        opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort);
+        qemu_opts_absorb_qdict(opts, backing_options, &local_err);
+        if (local_err) {
+            goto out;
+        }
+
+        ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE);
+        gsconf = g_new0(GlusterServer, 1);
+        gsconf->type = qapi_enum_parse(ptr);
+        if (!ptr) {
+            error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
+            error_append_hint(&local_err, GERR_INDEX_HINT, i);
+            goto out;
+
+        }
+        if (gsconf->type == GLUSTER_TRANSPORT__MAX) {
+            error_setg(&local_err, QERR_INVALID_PARAMETER_VALUE,
+                       GLUSTER_OPT_TYPE, "tcp or unix");
+            error_append_hint(&local_err, GERR_INDEX_HINT, i);
+            goto out;
+        }
+        qemu_opts_del(opts);
+
+        if (gsconf->type == GLUSTER_TRANSPORT_TCP) {
+            /* create opts info from runtime_tcp_opts list */
+            opts = qemu_opts_create(&runtime_tcp_opts, NULL, 0, &error_abort);
+            qemu_opts_absorb_qdict(opts, backing_options, &local_err);
+            if (local_err) {
+                goto out;
+            }
+
+            ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST);
+            if (!ptr) {
+                error_setg(&local_err, QERR_MISSING_PARAMETER,
+                           GLUSTER_OPT_HOST);
+                error_append_hint(&local_err, GERR_INDEX_HINT, i);
+                goto out;
+            }
+            gsconf->u.tcp.host = g_strdup(ptr);
+            ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT);
+            if (!ptr) {
+                error_setg(&local_err, QERR_MISSING_PARAMETER,
+                           GLUSTER_OPT_PORT);
+                error_append_hint(&local_err, GERR_INDEX_HINT, i);
+                goto out;
+            }
+            gsconf->u.tcp.port = g_strdup(ptr);
+
+            /* defend for unsupported fields in InetSocketAddress,
+             * i.e. @ipv4, @ipv6  and @to
+             */
+            ptr = qemu_opt_get(opts, GLUSTER_OPT_TO);
+            if (ptr) {
+                gsconf->u.tcp.has_to = true;
+            }
+            ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4);
+            if (ptr) {
+                gsconf->u.tcp.has_ipv4 = true;
+            }
+            ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6);
+            if (ptr) {
+                gsconf->u.tcp.has_ipv6 = true;
+            }
+            if (gsconf->u.tcp.has_to) {
+                error_setg(&local_err, "Parameter 'to' not supported");
+                goto out;
+            }
+            if (gsconf->u.tcp.has_ipv4 || gsconf->u.tcp.has_ipv6) {
+                error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported");
+                goto out;
+            }
+            qemu_opts_del(opts);
+        } else {
+            /* create opts info from runtime_unix_opts list */
+            opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort);
+            qemu_opts_absorb_qdict(opts, backing_options, &local_err);
+            if (local_err) {
+                goto out;
+            }
+
+            ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
+            if (!ptr) {
+                error_setg(&local_err, QERR_MISSING_PARAMETER,
+                           GLUSTER_OPT_SOCKET);
+                error_append_hint(&local_err, GERR_INDEX_HINT, i);
+                goto out;
+            }
+            gsconf->u.q_unix.path = g_strdup(ptr);
+            qemu_opts_del(opts);
+        }
+
+        if (gconf->server == NULL) {
+            gconf->server = g_new0(GlusterServerList, 1);
+            gconf->server->value = gsconf;
+            curr = gconf->server;
+        } else {
+            curr->next = g_new0(GlusterServerList, 1);
+            curr->next->value = gsconf;
+            curr = curr->next;
+        }
+
+        qdict_del(backing_options, str);
+        g_free(str);
+        str = NULL;
+    }
+
+    return 0;
+
+out:
+    error_propagate(errp, local_err);
+    qemu_opts_del(opts);
+    if (str) {
+        qdict_del(backing_options, str);
+        g_free(str);
+    }
+    errno = EINVAL;
+    return -errno;
+}
+
+static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
+                                      const char *filename,
+                                      QDict *options, Error **errp)
+{
+    int ret;
+    if (filename) {
+        ret = qemu_gluster_parse_uri(gconf, filename);
+        if (ret < 0) {
+            error_setg(errp, "invalid URI");
+            error_append_hint(errp, "Usage: file=gluster[+transport]://"
+                                    "[host[:port]]/volume/path[?socket=...]\n");
+            errno = -ret;
+            return NULL;
+        }
+    } else {
+        ret = qemu_gluster_parse_json(gconf, options, errp);
+        if (ret < 0) {
+            error_append_hint(errp, "Usage: "
+                             "-drive driver=qcow2,file.driver=gluster,"
+                             "file.volume=testvol,file.path=/path/a.qcow2"
+                             "[,file.debug=9],file.server.0.type=tcp,"
+                             "file.server.0.host=1.2.3.4,"
+                             "file.server.0.port=24007,"
+                             "file.server.1.transport=unix,"
+                             "file.server.1.socket=/var/run/glusterd.socket ..."
+                             "\n");
+            errno = -ret;
+            return NULL;
+        }
+
+    }
+
+    return qemu_gluster_glfs_init(gconf, errp);
+}
+
 static void qemu_gluster_complete_aio(void *opaque)
 {
     GlusterAIOCB *acb = (GlusterAIOCB *)opaque;
@@ -383,7 +700,7 @@ static int qemu_gluster_open(BlockDriverState *bs,  QDict *options,
     gconf = g_new0(BlockdevOptionsGluster, 1);
     gconf->debug_level = s->debug_level;
     gconf->has_debug_level = true;
-    s->glfs = qemu_gluster_init(gconf, filename, errp);
+    s->glfs = qemu_gluster_init(gconf, filename, options, errp);
     if (!s->glfs) {
         ret = -errno;
         goto out;
@@ -452,7 +769,7 @@ static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
     gconf = g_new0(BlockdevOptionsGluster, 1);
     gconf->debug_level = s->debug_level;
     gconf->has_debug_level = true;
-    reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, errp);
+    reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL, errp);
     if (reop_s->glfs == NULL) {
         ret = -errno;
         goto exit;
@@ -597,7 +914,7 @@ static int qemu_gluster_create(const char *filename,
     }
     gconf->has_debug_level = true;
 
-    glfs = qemu_gluster_init(gconf, filename, errp);
+    glfs = qemu_gluster_init(gconf, filename, NULL, errp);
     if (!glfs) {
         ret = -errno;
         goto out;
@@ -975,7 +1292,7 @@ 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,
@@ -1003,7 +1320,7 @@ 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,