block/gluster.c

   1 /*
   2  * GlusterFS backend for QEMU
   3  *
   4  * Copyright (C) 2012 Bharata B Rao <bharata@linux.vnet.ibm.com>
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  *
   9  */
  10 #include <glusterfs/api/glfs.h>
  11 #include "block/block_int.h"
  12 #include "qemu/uri.h"
  13
  14 typedef struct GlusterAIOCB {
  15     int64_t size;
  16     int ret;
  17     QEMUBH *bh;
  18     Coroutine *coroutine;
  19 } GlusterAIOCB;
  20
  21 typedef struct BDRVGlusterState {
  22     struct glfs *glfs;
  23     struct glfs_fd *fd;
  24 } BDRVGlusterState;
  25
  26 typedef struct GlusterConf {
  27     char *server;
  28     int port;
  29     char *volname;
  30     char *image;
  31     char *transport;
  32 } GlusterConf;
  33
  34 static void qemu_gluster_gconf_free(GlusterConf *gconf)
  35 {
  36     if (gconf) {
  37         g_free(gconf->server);
  38         g_free(gconf->volname);
  39         g_free(gconf->image);
  40         g_free(gconf->transport);
  41         g_free(gconf);
  42     }
  43 }
  44
  45 static int parse_volume_options(GlusterConf *gconf, char *path)
  46 {
  47     char *p, *q;
  48
  49     if (!path) {
  50         return -EINVAL;
  51     }
  52
  53     /* volume */
  54     p = q = path + strspn(path, "/");
  55     p += strcspn(p, "/");
  56     if (*p == '\0') {
  57         return -EINVAL;
  58     }
  59     gconf->volname = g_strndup(q, p - q);
  60
  61     /* image */
  62     p += strspn(p, "/");
  63     if (*p == '\0') {
  64         return -EINVAL;
  65     }
  66     gconf->image = g_strdup(p);
  67     return 0;
  68 }
  69
  70 /*
  71  * file=gluster[+transport]://[server[:port]]/volname/image[?socket=...]
  72  *
  73  * 'gluster' is the protocol.
  74  *
  75  * 'transport' specifies the transport type used to connect to gluster
  76  * management daemon (glusterd). Valid transport types are
  77  * tcp, unix and rdma. If a transport type isn't specified, then tcp
  78  * type is assumed.
  79  *
  80  * 'server' specifies the server where the volume file specification for
  81  * the given volume resides. This can be either hostname, ipv4 address
  82  * or ipv6 address. ipv6 address needs to be within square brackets [ ].
  83  * If transport type is 'unix', then 'server' field should not be specified.
  84  * The 'socket' field needs to be populated with the path to unix domain
  85  * socket.
  86  *
  87  * 'port' is the port number on which glusterd is listening. This is optional
  88  * and if not specified, QEMU will send 0 which will make gluster to use the
  89  * default port. If the transport type is unix, then 'port' should not be
  90  * specified.
  91  *
  92  * 'volname' is the name of the gluster volume which contains the VM image.
  93  *
  94  * 'image' is the path to the actual VM image that resides on gluster volume.
  95  *
  96  * Examples:
  97  *
  98  * file=gluster://1.2.3.4/testvol/a.img
  99  * file=gluster+tcp://1.2.3.4/testvol/a.img
 100  * file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img
 101  * file=gluster+tcp://[1:2:3:4:5:6:7:8]/testvol/dir/a.img
 102  * file=gluster+tcp://[1:2:3:4:5:6:7:8]:24007/testvol/dir/a.img
 103  * file=gluster+tcp://server.domain.com:24007/testvol/dir/a.img
 104  * file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
 105  * file=gluster+rdma://1.2.3.4:24007/testvol/a.img
 106  */
 107 static int qemu_gluster_parseuri(GlusterConf *gconf, const char *filename)
 108 {
 109     URI *uri;
 110     QueryParams *qp = NULL;
 111     bool is_unix = false;
 112     int ret = 0;
 113
 114     uri = uri_parse(filename);
 115     if (!uri) {
 116         return -EINVAL;
 117     }
 118
 119     /* transport */
 120     if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
 121         gconf->transport = g_strdup("tcp");
 122     } else if (!strcmp(uri->scheme, "gluster+tcp")) {
 123         gconf->transport = g_strdup("tcp");
 124     } else if (!strcmp(uri->scheme, "gluster+unix")) {
 125         gconf->transport = g_strdup("unix");
 126         is_unix = true;
 127     } else if (!strcmp(uri->scheme, "gluster+rdma")) {
 128         gconf->transport = g_strdup("rdma");
 129     } else {
 130         ret = -EINVAL;
 131         goto out;
 132     }
 133
 134     ret = parse_volume_options(gconf, uri->path);
 135     if (ret < 0) {
 136         goto out;
 137     }
 138
 139     qp = query_params_parse(uri->query);
 140     if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
 141         ret = -EINVAL;
 142         goto out;
 143     }
 144
 145     if (is_unix) {
 146         if (uri->server || uri->port) {
 147             ret = -EINVAL;
 148             goto out;
 149         }
 150         if (strcmp(qp->p[0].name, "socket")) {
 151             ret = -EINVAL;
 152             goto out;
 153         }
 154         gconf->server = g_strdup(qp->p[0].value);
 155     } else {
 156         gconf->server = g_strdup(uri->server ? uri->server : "localhost");
 157         gconf->port = uri->port;
 158     }
 159
 160 out:
 161     if (qp) {
 162         query_params_free(qp);
 163     }
 164     uri_free(uri);
 165     return ret;
 166 }
 167
 168 static struct glfs *qemu_gluster_init(GlusterConf *gconf, const char *filename,
 169                                       Error **errp)
 170 {
 171     struct glfs *glfs = NULL;
 172     int ret;
 173     int old_errno;
 174
 175     ret = qemu_gluster_parseuri(gconf, filename);
 176     if (ret < 0) {
 177         error_setg(errp, "Usage: file=gluster[+transport]://[server[:port]]/"
 178                    "volname/image[?socket=...]");
 179         errno = -ret;
 180         goto out;
 181     }
 182
 183     glfs = glfs_new(gconf->volname);
 184     if (!glfs) {
 185         goto out;
 186     }
 187
 188     ret = glfs_set_volfile_server(glfs, gconf->transport, gconf->server,
 189             gconf->port);
 190     if (ret < 0) {
 191         goto out;
 192     }
 193
 194     /*
 195      * TODO: Use GF_LOG_ERROR instead of hard code value of 4 here when
 196      * GlusterFS makes GF_LOG_* macros available to libgfapi users.
 197      */
 198     ret = glfs_set_logging(glfs, "-", 4);
 199     if (ret < 0) {
 200         goto out;
 201     }
 202
 203     ret = glfs_init(glfs);
 204     if (ret) {
 205         error_setg_errno(errp, errno,
 206                          "Gluster connection failed for server=%s port=%d "
 207                          "volume=%s image=%s transport=%s", gconf->server,
 208                          gconf->port, gconf->volname, gconf->image,
 209                          gconf->transport);
 210         goto out;
 211     }
 212     return glfs;
 213
 214 out:
 215     if (glfs) {
 216         old_errno = errno;
 217         glfs_fini(glfs);
 218         errno = old_errno;
 219     }
 220     return NULL;
 221 }
 222
 223 static void qemu_gluster_complete_aio(void *opaque)
 224 {
 225     GlusterAIOCB *acb = (GlusterAIOCB *)opaque;
 226
 227     qemu_bh_delete(acb->bh);
 228     acb->bh = NULL;
 229     qemu_coroutine_enter(acb->coroutine, NULL);
 230 }
 231
 232 /*
 233  * AIO callback routine called from GlusterFS thread.
 234  */
 235 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
 236 {
 237     GlusterAIOCB *acb = (GlusterAIOCB *)arg;
 238
 239     if (!ret || ret == acb->size) {
 240         acb->ret = 0; /* Success */
 241     } else if (ret < 0) {
 242         acb->ret = ret; /* Read/Write failed */
 243     } else {
 244         acb->ret = -EIO; /* Partial read/write - fail it */
 245     }
 246
 247     acb->bh = qemu_bh_new(qemu_gluster_complete_aio, acb);
 248     qemu_bh_schedule(acb->bh);
 249 }
 250
 251 /* TODO Convert to fine grained options */
 252 static QemuOptsList runtime_opts = {
 253     .name = "gluster",
 254     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 255     .desc = {
 256         {
 257             .name = "filename",
 258             .type = QEMU_OPT_STRING,
 259             .help = "URL to the gluster image",
 260         },
 261         { /* end of list */ }
 262     },
 263 };
 264
 265 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags)
 266 {
 267     assert(open_flags != NULL);
 268
 269     *open_flags |= O_BINARY;
 270
 271     if (bdrv_flags & BDRV_O_RDWR) {
 272         *open_flags |= O_RDWR;
 273     } else {
 274         *open_flags |= O_RDONLY;
 275     }
 276
 277     if ((bdrv_flags & BDRV_O_NOCACHE)) {
 278         *open_flags |= O_DIRECT;
 279     }
 280 }
 281
 282 static int qemu_gluster_open(BlockDriverState *bs,  QDict *options,
 283                              int bdrv_flags, Error **errp)
 284 {
 285     BDRVGlusterState *s = bs->opaque;
 286     int open_flags = 0;
 287     int ret = 0;
 288     GlusterConf *gconf = g_malloc0(sizeof(GlusterConf));
 289     QemuOpts *opts;
 290     Error *local_err = NULL;
 291     const char *filename;
 292
 293     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 294     qemu_opts_absorb_qdict(opts, options, &local_err);
 295     if (local_err) {
 296         error_propagate(errp, local_err);
 297         ret = -EINVAL;
 298         goto out;
 299     }
 300
 301     filename = qemu_opt_get(opts, "filename");
 302
 303     s->glfs = qemu_gluster_init(gconf, filename, errp);
 304     if (!s->glfs) {
 305         ret = -errno;
 306         goto out;
 307     }
 308
 309     qemu_gluster_parse_flags(bdrv_flags, &open_flags);
 310
 311     s->fd = glfs_open(s->glfs, gconf->image, open_flags);
 312     if (!s->fd) {
 313         ret = -errno;
 314     }
 315
 316 out:
 317     qemu_opts_del(opts);
 318     qemu_gluster_gconf_free(gconf);
 319     if (!ret) {
 320         return ret;
 321     }
 322     if (s->fd) {
 323         glfs_close(s->fd);
 324     }
 325     if (s->glfs) {
 326         glfs_fini(s->glfs);
 327     }
 328     return ret;
 329 }
 330
 331 typedef struct BDRVGlusterReopenState {
 332     struct glfs *glfs;
 333     struct glfs_fd *fd;
 334 } BDRVGlusterReopenState;
 335
 336
 337 static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
 338                                        BlockReopenQueue *queue, Error **errp)
 339 {
 340     int ret = 0;
 341     BDRVGlusterReopenState *reop_s;
 342     GlusterConf *gconf = NULL;
 343     int open_flags = 0;
 344
 345     assert(state != NULL);
 346     assert(state->bs != NULL);
 347
 348     state->opaque = g_malloc0(sizeof(BDRVGlusterReopenState));
 349     reop_s = state->opaque;
 350
 351     qemu_gluster_parse_flags(state->flags, &open_flags);
 352
 353     gconf = g_malloc0(sizeof(GlusterConf));
 354
 355     reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, errp);
 356     if (reop_s->glfs == NULL) {
 357         ret = -errno;
 358         goto exit;
 359     }
 360
 361     reop_s->fd = glfs_open(reop_s->glfs, gconf->image, open_flags);
 362     if (reop_s->fd == NULL) {
 363         /* reops->glfs will be cleaned up in _abort */
 364         ret = -errno;
 365         goto exit;
 366     }
 367
 368 exit:
 369     /* state->opaque will be freed in either the _abort or _commit */
 370     qemu_gluster_gconf_free(gconf);
 371     return ret;
 372 }
 373
 374 static void qemu_gluster_reopen_commit(BDRVReopenState *state)
 375 {
 376     BDRVGlusterReopenState *reop_s = state->opaque;
 377     BDRVGlusterState *s = state->bs->opaque;
 378
 379
 380     /* close the old */
 381     if (s->fd) {
 382         glfs_close(s->fd);
 383     }
 384     if (s->glfs) {
 385         glfs_fini(s->glfs);
 386     }
 387
 388     /* use the newly opened image / connection */
 389     s->fd         = reop_s->fd;
 390     s->glfs       = reop_s->glfs;
 391
 392     g_free(state->opaque);
 393     state->opaque = NULL;
 394
 395     return;
 396 }
 397
 398
 399 static void qemu_gluster_reopen_abort(BDRVReopenState *state)
 400 {
 401     BDRVGlusterReopenState *reop_s = state->opaque;
 402
 403     if (reop_s == NULL) {
 404         return;
 405     }
 406
 407     if (reop_s->fd) {
 408         glfs_close(reop_s->fd);
 409     }
 410
 411     if (reop_s->glfs) {
 412         glfs_fini(reop_s->glfs);
 413     }
 414
 415     g_free(state->opaque);
 416     state->opaque = NULL;
 417
 418     return;
 419 }
 420
 421 #ifdef CONFIG_GLUSTERFS_ZEROFILL
 422 static coroutine_fn int qemu_gluster_co_write_zeroes(BlockDriverState *bs,
 423         int64_t sector_num, int nb_sectors, BdrvRequestFlags flags)
 424 {
 425     int ret;
 426     GlusterAIOCB *acb = g_slice_new(GlusterAIOCB);
 427     BDRVGlusterState *s = bs->opaque;
 428     off_t size = nb_sectors * BDRV_SECTOR_SIZE;
 429     off_t offset = sector_num * BDRV_SECTOR_SIZE;
 430
 431     acb->size = size;
 432     acb->ret = 0;
 433     acb->coroutine = qemu_coroutine_self();
 434
 435     ret = glfs_zerofill_async(s->fd, offset, size, &gluster_finish_aiocb, acb);
 436     if (ret < 0) {
 437         ret = -errno;
 438         goto out;
 439     }
 440
 441     qemu_coroutine_yield();
 442     ret = acb->ret;
 443
 444 out:
 445     g_slice_free(GlusterAIOCB, acb);
 446     return ret;
 447 }
 448
 449 static inline bool gluster_supports_zerofill(void)
 450 {
 451     return 1;
 452 }
 453
 454 static inline int qemu_gluster_zerofill(struct glfs_fd *fd, int64_t offset,
 455         int64_t size)
 456 {
 457     return glfs_zerofill(fd, offset, size);
 458 }
 459
 460 #else
 461 static inline bool gluster_supports_zerofill(void)
 462 {
 463     return 0;
 464 }
 465
 466 static inline int qemu_gluster_zerofill(struct glfs_fd *fd, int64_t offset,
 467         int64_t size)
 468 {
 469     return 0;
 470 }
 471 #endif
 472
 473 static int qemu_gluster_create(const char *filename,
 474         QEMUOptionParameter *options, Error **errp)
 475 {
 476     struct glfs *glfs;
 477     struct glfs_fd *fd;
 478     int ret = 0;
 479     int prealloc = 0;
 480     int64_t total_size = 0;
 481     GlusterConf *gconf = g_malloc0(sizeof(GlusterConf));
 482
 483     glfs = qemu_gluster_init(gconf, filename, errp);
 484     if (!glfs) {
 485         ret = -EINVAL;
 486         goto out;
 487     }
 488
 489     while (options && options->name) {
 490         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 491             total_size = options->value.n / BDRV_SECTOR_SIZE;
 492         } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) {
 493             if (!options->value.s || !strcmp(options->value.s, "off")) {
 494                 prealloc = 0;
 495             } else if (!strcmp(options->value.s, "full") &&
 496                     gluster_supports_zerofill()) {
 497                 prealloc = 1;
 498             } else {
 499                 error_setg(errp, "Invalid preallocation mode: '%s'"
 500                     " or GlusterFS doesn't support zerofill API",
 501                            options->value.s);
 502                 ret = -EINVAL;
 503                 goto out;
 504             }
 505         }
 506         options++;
 507     }
 508
 509     fd = glfs_creat(glfs, gconf->image,
 510         O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR);
 511     if (!fd) {
 512         ret = -errno;
 513     } else {
 514         if (!glfs_ftruncate(fd, total_size * BDRV_SECTOR_SIZE)) {
 515             if (prealloc && qemu_gluster_zerofill(fd, 0,
 516                     total_size * BDRV_SECTOR_SIZE)) {
 517                 ret = -errno;
 518             }
 519         } else {
 520             ret = -errno;
 521         }
 522
 523         if (glfs_close(fd) != 0) {
 524             ret = -errno;
 525         }
 526     }
 527 out:
 528     qemu_gluster_gconf_free(gconf);
 529     if (glfs) {
 530         glfs_fini(glfs);
 531     }
 532     return ret;
 533 }
 534
 535 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs,
 536         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, int write)
 537 {
 538     int ret;
 539     GlusterAIOCB *acb = g_slice_new(GlusterAIOCB);
 540     BDRVGlusterState *s = bs->opaque;
 541     size_t size = nb_sectors * BDRV_SECTOR_SIZE;
 542     off_t offset = sector_num * BDRV_SECTOR_SIZE;
 543
 544     acb->size = size;
 545     acb->ret = 0;
 546     acb->coroutine = qemu_coroutine_self();
 547
 548     if (write) {
 549         ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0,
 550             &gluster_finish_aiocb, acb);
 551     } else {
 552         ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0,
 553             &gluster_finish_aiocb, acb);
 554     }
 555
 556     if (ret < 0) {
 557         ret = -errno;
 558         goto out;
 559     }
 560
 561     qemu_coroutine_yield();
 562     ret = acb->ret;
 563
 564 out:
 565     g_slice_free(GlusterAIOCB, acb);
 566     return ret;
 567 }
 568
 569 static int qemu_gluster_truncate(BlockDriverState *bs, int64_t offset)
 570 {
 571     int ret;
 572     BDRVGlusterState *s = bs->opaque;
 573
 574     ret = glfs_ftruncate(s->fd, offset);
 575     if (ret < 0) {
 576         return -errno;
 577     }
 578
 579     return 0;
 580 }
 581
 582 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs,
 583         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 584 {
 585     return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0);
 586 }
 587
 588 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs,
 589         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 590 {
 591     return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1);
 592 }
 593
 594 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs)
 595 {
 596     int ret;
 597     GlusterAIOCB *acb = g_slice_new(GlusterAIOCB);
 598     BDRVGlusterState *s = bs->opaque;
 599
 600     acb->size = 0;
 601     acb->ret = 0;
 602     acb->coroutine = qemu_coroutine_self();
 603
 604     ret = glfs_fsync_async(s->fd, &gluster_finish_aiocb, acb);
 605     if (ret < 0) {
 606         ret = -errno;
 607         goto out;
 608     }
 609
 610     qemu_coroutine_yield();
 611     ret = acb->ret;
 612
 613 out:
 614     g_slice_free(GlusterAIOCB, acb);
 615     return ret;
 616 }
 617
 618 #ifdef CONFIG_GLUSTERFS_DISCARD
 619 static coroutine_fn int qemu_gluster_co_discard(BlockDriverState *bs,
 620         int64_t sector_num, int nb_sectors)
 621 {
 622     int ret;
 623     GlusterAIOCB *acb = g_slice_new(GlusterAIOCB);
 624     BDRVGlusterState *s = bs->opaque;
 625     size_t size = nb_sectors * BDRV_SECTOR_SIZE;
 626     off_t offset = sector_num * BDRV_SECTOR_SIZE;
 627
 628     acb->size = 0;
 629     acb->ret = 0;
 630     acb->coroutine = qemu_coroutine_self();
 631
 632     ret = glfs_discard_async(s->fd, offset, size, &gluster_finish_aiocb, acb);
 633     if (ret < 0) {
 634         ret = -errno;
 635         goto out;
 636     }
 637
 638     qemu_coroutine_yield();
 639     ret = acb->ret;
 640
 641 out:
 642     g_slice_free(GlusterAIOCB, acb);
 643     return ret;
 644 }
 645 #endif
 646
 647 static int64_t qemu_gluster_getlength(BlockDriverState *bs)
 648 {
 649     BDRVGlusterState *s = bs->opaque;
 650     int64_t ret;
 651
 652     ret = glfs_lseek(s->fd, 0, SEEK_END);
 653     if (ret < 0) {
 654         return -errno;
 655     } else {
 656         return ret;
 657     }
 658 }
 659
 660 static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs)
 661 {
 662     BDRVGlusterState *s = bs->opaque;
 663     struct stat st;
 664     int ret;
 665
 666     ret = glfs_fstat(s->fd, &st);
 667     if (ret < 0) {
 668         return -errno;
 669     } else {
 670         return st.st_blocks * 512;
 671     }
 672 }
 673
 674 static void qemu_gluster_close(BlockDriverState *bs)
 675 {
 676     BDRVGlusterState *s = bs->opaque;
 677
 678     if (s->fd) {
 679         glfs_close(s->fd);
 680         s->fd = NULL;
 681     }
 682     glfs_fini(s->glfs);
 683 }
 684
 685 static int qemu_gluster_has_zero_init(BlockDriverState *bs)
 686 {
 687     /* GlusterFS volume could be backed by a block device */
 688     return 0;
 689 }
 690
 691 static QEMUOptionParameter qemu_gluster_create_options[] = {
 692     {
 693         .name = BLOCK_OPT_SIZE,
 694         .type = OPT_SIZE,
 695         .help = "Virtual disk size"
 696     },
 697     {
 698         .name = BLOCK_OPT_PREALLOC,
 699         .type = OPT_STRING,
 700         .help = "Preallocation mode (allowed values: off, full)"
 701     },
 702     { NULL }
 703 };
 704
 705 static BlockDriver bdrv_gluster = {
 706     .format_name                  = "gluster",
 707     .protocol_name                = "gluster",
 708     .instance_size                = sizeof(BDRVGlusterState),
 709     .bdrv_needs_filename          = true,
 710     .bdrv_file_open               = qemu_gluster_open,
 711     .bdrv_reopen_prepare          = qemu_gluster_reopen_prepare,
 712     .bdrv_reopen_commit           = qemu_gluster_reopen_commit,
 713     .bdrv_reopen_abort            = qemu_gluster_reopen_abort,
 714     .bdrv_close                   = qemu_gluster_close,
 715     .bdrv_create                  = qemu_gluster_create,
 716     .bdrv_getlength               = qemu_gluster_getlength,
 717     .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
 718     .bdrv_truncate                = qemu_gluster_truncate,
 719     .bdrv_co_readv                = qemu_gluster_co_readv,
 720     .bdrv_co_writev               = qemu_gluster_co_writev,
 721     .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
 722     .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
 723 #ifdef CONFIG_GLUSTERFS_DISCARD
 724     .bdrv_co_discard              = qemu_gluster_co_discard,
 725 #endif
 726 #ifdef CONFIG_GLUSTERFS_ZEROFILL
 727     .bdrv_co_write_zeroes         = qemu_gluster_co_write_zeroes,
 728 #endif
 729     .create_options               = qemu_gluster_create_options,
 730 };
 731
 732 static BlockDriver bdrv_gluster_tcp = {
 733     .format_name                  = "gluster",
 734     .protocol_name                = "gluster+tcp",
 735     .instance_size                = sizeof(BDRVGlusterState),
 736     .bdrv_needs_filename          = true,
 737     .bdrv_file_open               = qemu_gluster_open,
 738     .bdrv_reopen_prepare          = qemu_gluster_reopen_prepare,
 739     .bdrv_reopen_commit           = qemu_gluster_reopen_commit,
 740     .bdrv_reopen_abort            = qemu_gluster_reopen_abort,
 741     .bdrv_close                   = qemu_gluster_close,
 742     .bdrv_create                  = qemu_gluster_create,
 743     .bdrv_getlength               = qemu_gluster_getlength,
 744     .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
 745     .bdrv_truncate                = qemu_gluster_truncate,
 746     .bdrv_co_readv                = qemu_gluster_co_readv,
 747     .bdrv_co_writev               = qemu_gluster_co_writev,
 748     .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
 749     .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
 750 #ifdef CONFIG_GLUSTERFS_DISCARD
 751     .bdrv_co_discard              = qemu_gluster_co_discard,
 752 #endif
 753 #ifdef CONFIG_GLUSTERFS_ZEROFILL
 754     .bdrv_co_write_zeroes         = qemu_gluster_co_write_zeroes,
 755 #endif
 756     .create_options               = qemu_gluster_create_options,
 757 };
 758
 759 static BlockDriver bdrv_gluster_unix = {
 760     .format_name                  = "gluster",
 761     .protocol_name                = "gluster+unix",
 762     .instance_size                = sizeof(BDRVGlusterState),
 763     .bdrv_needs_filename          = true,
 764     .bdrv_file_open               = qemu_gluster_open,
 765     .bdrv_reopen_prepare          = qemu_gluster_reopen_prepare,
 766     .bdrv_reopen_commit           = qemu_gluster_reopen_commit,
 767     .bdrv_reopen_abort            = qemu_gluster_reopen_abort,
 768     .bdrv_close                   = qemu_gluster_close,
 769     .bdrv_create                  = qemu_gluster_create,
 770     .bdrv_getlength               = qemu_gluster_getlength,
 771     .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
 772     .bdrv_truncate                = qemu_gluster_truncate,
 773     .bdrv_co_readv                = qemu_gluster_co_readv,
 774     .bdrv_co_writev               = qemu_gluster_co_writev,
 775     .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
 776     .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
 777 #ifdef CONFIG_GLUSTERFS_DISCARD
 778     .bdrv_co_discard              = qemu_gluster_co_discard,
 779 #endif
 780 #ifdef CONFIG_GLUSTERFS_ZEROFILL
 781     .bdrv_co_write_zeroes         = qemu_gluster_co_write_zeroes,
 782 #endif
 783     .create_options               = qemu_gluster_create_options,
 784 };
 785
 786 static BlockDriver bdrv_gluster_rdma = {
 787     .format_name                  = "gluster",
 788     .protocol_name                = "gluster+rdma",
 789     .instance_size                = sizeof(BDRVGlusterState),
 790     .bdrv_needs_filename          = true,
 791     .bdrv_file_open               = qemu_gluster_open,
 792     .bdrv_reopen_prepare          = qemu_gluster_reopen_prepare,
 793     .bdrv_reopen_commit           = qemu_gluster_reopen_commit,
 794     .bdrv_reopen_abort            = qemu_gluster_reopen_abort,
 795     .bdrv_close                   = qemu_gluster_close,
 796     .bdrv_create                  = qemu_gluster_create,
 797     .bdrv_getlength               = qemu_gluster_getlength,
 798     .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
 799     .bdrv_truncate                = qemu_gluster_truncate,
 800     .bdrv_co_readv                = qemu_gluster_co_readv,
 801     .bdrv_co_writev               = qemu_gluster_co_writev,
 802     .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
 803     .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
 804 #ifdef CONFIG_GLUSTERFS_DISCARD
 805     .bdrv_co_discard              = qemu_gluster_co_discard,
 806 #endif
 807 #ifdef CONFIG_GLUSTERFS_ZEROFILL
 808     .bdrv_co_write_zeroes         = qemu_gluster_co_write_zeroes,
 809 #endif
 810     .create_options               = qemu_gluster_create_options,
 811 };
 812
 813 static void bdrv_gluster_init(void)
 814 {
 815     bdrv_register(&bdrv_gluster_rdma);
 816     bdrv_register(&bdrv_gluster_unix);
 817     bdrv_register(&bdrv_gluster_tcp);
 818     bdrv_register(&bdrv_gluster);
 819 }
 820
 821 block_init(bdrv_gluster_init);