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 "qemu/osdep.h" 11 #include <glusterfs/api/glfs.h> 12 #include "block/block_int.h" 13 #include "qapi/error.h" 14 #include "qapi/qmp/qerror.h" 15 #include "qemu/uri.h" 16 #include "qemu/error-report.h" 17 #include "qemu/cutils.h" 18 19 #define GLUSTER_OPT_FILENAME "filename" 20 #define GLUSTER_OPT_VOLUME "volume" 21 #define GLUSTER_OPT_PATH "path" 22 #define GLUSTER_OPT_TYPE "type" 23 #define GLUSTER_OPT_SERVER_PATTERN "server." 24 #define GLUSTER_OPT_HOST "host" 25 #define GLUSTER_OPT_PORT "port" 26 #define GLUSTER_OPT_TO "to" 27 #define GLUSTER_OPT_IPV4 "ipv4" 28 #define GLUSTER_OPT_IPV6 "ipv6" 29 #define GLUSTER_OPT_SOCKET "socket" 30 #define GLUSTER_OPT_DEBUG "debug" 31 #define GLUSTER_DEFAULT_PORT 24007 32 #define GLUSTER_DEBUG_DEFAULT 4 33 #define GLUSTER_DEBUG_MAX 9 34 #define GLUSTER_OPT_LOGFILE "logfile" 35 #define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */ 36 37 #define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n" 38 39 typedef struct GlusterAIOCB { 40 int64_t size; 41 int ret; 42 Coroutine *coroutine; 43 AioContext *aio_context; 44 } GlusterAIOCB; 45 46 typedef struct BDRVGlusterState { 47 struct glfs *glfs; 48 struct glfs_fd *fd; 49 char *logfile; 50 bool supports_seek_data; 51 int debug; 52 } BDRVGlusterState; 53 54 typedef struct BDRVGlusterReopenState { 55 struct glfs *glfs; 56 struct glfs_fd *fd; 57 } BDRVGlusterReopenState; 58 59 60 typedef struct GlfsPreopened { 61 char *volume; 62 glfs_t *fs; 63 int ref; 64 } GlfsPreopened; 65 66 typedef struct ListElement { 67 QLIST_ENTRY(ListElement) list; 68 GlfsPreopened saved; 69 } ListElement; 70 71 static QLIST_HEAD(glfs_list, ListElement) glfs_list; 72 73 static QemuOptsList qemu_gluster_create_opts = { 74 .name = "qemu-gluster-create-opts", 75 .head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head), 76 .desc = { 77 { 78 .name = BLOCK_OPT_SIZE, 79 .type = QEMU_OPT_SIZE, 80 .help = "Virtual disk size" 81 }, 82 { 83 .name = BLOCK_OPT_PREALLOC, 84 .type = QEMU_OPT_STRING, 85 .help = "Preallocation mode (allowed values: off, full)" 86 }, 87 { 88 .name = GLUSTER_OPT_DEBUG, 89 .type = QEMU_OPT_NUMBER, 90 .help = "Gluster log level, valid range is 0-9", 91 }, 92 { 93 .name = GLUSTER_OPT_LOGFILE, 94 .type = QEMU_OPT_STRING, 95 .help = "Logfile path of libgfapi", 96 }, 97 { /* end of list */ } 98 } 99 }; 100 101 static QemuOptsList runtime_opts = { 102 .name = "gluster", 103 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 104 .desc = { 105 { 106 .name = GLUSTER_OPT_FILENAME, 107 .type = QEMU_OPT_STRING, 108 .help = "URL to the gluster image", 109 }, 110 { 111 .name = GLUSTER_OPT_DEBUG, 112 .type = QEMU_OPT_NUMBER, 113 .help = "Gluster log level, valid range is 0-9", 114 }, 115 { 116 .name = GLUSTER_OPT_LOGFILE, 117 .type = QEMU_OPT_STRING, 118 .help = "Logfile path of libgfapi", 119 }, 120 { /* end of list */ } 121 }, 122 }; 123 124 static QemuOptsList runtime_json_opts = { 125 .name = "gluster_json", 126 .head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head), 127 .desc = { 128 { 129 .name = GLUSTER_OPT_VOLUME, 130 .type = QEMU_OPT_STRING, 131 .help = "name of gluster volume where VM image resides", 132 }, 133 { 134 .name = GLUSTER_OPT_PATH, 135 .type = QEMU_OPT_STRING, 136 .help = "absolute path to image file in gluster volume", 137 }, 138 { 139 .name = GLUSTER_OPT_DEBUG, 140 .type = QEMU_OPT_NUMBER, 141 .help = "Gluster log level, valid range is 0-9", 142 }, 143 { /* end of list */ } 144 }, 145 }; 146 147 static QemuOptsList runtime_type_opts = { 148 .name = "gluster_type", 149 .head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head), 150 .desc = { 151 { 152 .name = GLUSTER_OPT_TYPE, 153 .type = QEMU_OPT_STRING, 154 .help = "tcp|unix", 155 }, 156 { /* end of list */ } 157 }, 158 }; 159 160 static QemuOptsList runtime_unix_opts = { 161 .name = "gluster_unix", 162 .head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head), 163 .desc = { 164 { 165 .name = GLUSTER_OPT_SOCKET, 166 .type = QEMU_OPT_STRING, 167 .help = "socket file path)", 168 }, 169 { /* end of list */ } 170 }, 171 }; 172 173 static QemuOptsList runtime_tcp_opts = { 174 .name = "gluster_tcp", 175 .head = QTAILQ_HEAD_INITIALIZER(runtime_tcp_opts.head), 176 .desc = { 177 { 178 .name = GLUSTER_OPT_TYPE, 179 .type = QEMU_OPT_STRING, 180 .help = "tcp|unix", 181 }, 182 { 183 .name = GLUSTER_OPT_HOST, 184 .type = QEMU_OPT_STRING, 185 .help = "host address (hostname/ipv4/ipv6 addresses)", 186 }, 187 { 188 .name = GLUSTER_OPT_PORT, 189 .type = QEMU_OPT_STRING, 190 .help = "port number on which glusterd is listening (default 24007)", 191 }, 192 { 193 .name = "to", 194 .type = QEMU_OPT_NUMBER, 195 .help = "max port number, not supported by gluster", 196 }, 197 { 198 .name = "ipv4", 199 .type = QEMU_OPT_BOOL, 200 .help = "ipv4 bool value, not supported by gluster", 201 }, 202 { 203 .name = "ipv6", 204 .type = QEMU_OPT_BOOL, 205 .help = "ipv6 bool value, not supported by gluster", 206 }, 207 { /* end of list */ } 208 }, 209 }; 210 211 static void glfs_set_preopened(const char *volume, glfs_t *fs) 212 { 213 ListElement *entry = NULL; 214 215 entry = g_new(ListElement, 1); 216 217 entry->saved.volume = g_strdup(volume); 218 219 entry->saved.fs = fs; 220 entry->saved.ref = 1; 221 222 QLIST_INSERT_HEAD(&glfs_list, entry, list); 223 } 224 225 static glfs_t *glfs_find_preopened(const char *volume) 226 { 227 ListElement *entry = NULL; 228 229 QLIST_FOREACH(entry, &glfs_list, list) { 230 if (strcmp(entry->saved.volume, volume) == 0) { 231 entry->saved.ref++; 232 return entry->saved.fs; 233 } 234 } 235 236 return NULL; 237 } 238 239 static void glfs_clear_preopened(glfs_t *fs) 240 { 241 ListElement *entry = NULL; 242 ListElement *next; 243 244 if (fs == NULL) { 245 return; 246 } 247 248 QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) { 249 if (entry->saved.fs == fs) { 250 if (--entry->saved.ref) { 251 return; 252 } 253 254 QLIST_REMOVE(entry, list); 255 256 glfs_fini(entry->saved.fs); 257 g_free(entry->saved.volume); 258 g_free(entry); 259 } 260 } 261 } 262 263 static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path) 264 { 265 char *p, *q; 266 267 if (!path) { 268 return -EINVAL; 269 } 270 271 /* volume */ 272 p = q = path + strspn(path, "/"); 273 p += strcspn(p, "/"); 274 if (*p == '\0') { 275 return -EINVAL; 276 } 277 gconf->volume = g_strndup(q, p - q); 278 279 /* path */ 280 p += strspn(p, "/"); 281 if (*p == '\0') { 282 return -EINVAL; 283 } 284 gconf->path = g_strdup(p); 285 return 0; 286 } 287 288 /* 289 * file=gluster[+transport]://[host[:port]]/volume/path[?socket=...] 290 * 291 * 'gluster' is the protocol. 292 * 293 * 'transport' specifies the transport type used to connect to gluster 294 * management daemon (glusterd). Valid transport types are 295 * tcp or unix. If a transport type isn't specified, then tcp type is assumed. 296 * 297 * 'host' specifies the host where the volume file specification for 298 * the given volume resides. This can be either hostname or ipv4 address. 299 * If transport type is 'unix', then 'host' field should not be specified. 300 * The 'socket' field needs to be populated with the path to unix domain 301 * socket. 302 * 303 * 'port' is the port number on which glusterd is listening. This is optional 304 * and if not specified, QEMU will send 0 which will make gluster to use the 305 * default port. If the transport type is unix, then 'port' should not be 306 * specified. 307 * 308 * 'volume' is the name of the gluster volume which contains the VM image. 309 * 310 * 'path' is the path to the actual VM image that resides on gluster volume. 311 * 312 * Examples: 313 * 314 * file=gluster://1.2.3.4/testvol/a.img 315 * file=gluster+tcp://1.2.3.4/testvol/a.img 316 * file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img 317 * file=gluster+tcp://host.domain.com:24007/testvol/dir/a.img 318 * file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket 319 */ 320 static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf, 321 const char *filename) 322 { 323 GlusterServer *gsconf; 324 URI *uri; 325 QueryParams *qp = NULL; 326 bool is_unix = false; 327 int ret = 0; 328 329 uri = uri_parse(filename); 330 if (!uri) { 331 return -EINVAL; 332 } 333 334 gconf->server = g_new0(GlusterServerList, 1); 335 gconf->server->value = gsconf = g_new0(GlusterServer, 1); 336 337 /* transport */ 338 if (!uri->scheme || !strcmp(uri->scheme, "gluster")) { 339 gsconf->type = GLUSTER_TRANSPORT_TCP; 340 } else if (!strcmp(uri->scheme, "gluster+tcp")) { 341 gsconf->type = GLUSTER_TRANSPORT_TCP; 342 } else if (!strcmp(uri->scheme, "gluster+unix")) { 343 gsconf->type = GLUSTER_TRANSPORT_UNIX; 344 is_unix = true; 345 } else if (!strcmp(uri->scheme, "gluster+rdma")) { 346 gsconf->type = GLUSTER_TRANSPORT_TCP; 347 error_report("Warning: rdma feature is not supported, falling " 348 "back to tcp"); 349 } else { 350 ret = -EINVAL; 351 goto out; 352 } 353 354 ret = parse_volume_options(gconf, uri->path); 355 if (ret < 0) { 356 goto out; 357 } 358 359 qp = query_params_parse(uri->query); 360 if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { 361 ret = -EINVAL; 362 goto out; 363 } 364 365 if (is_unix) { 366 if (uri->server || uri->port) { 367 ret = -EINVAL; 368 goto out; 369 } 370 if (strcmp(qp->p[0].name, "socket")) { 371 ret = -EINVAL; 372 goto out; 373 } 374 gsconf->u.q_unix.path = g_strdup(qp->p[0].value); 375 } else { 376 gsconf->u.tcp.host = g_strdup(uri->server ? uri->server : "localhost"); 377 if (uri->port) { 378 gsconf->u.tcp.port = g_strdup_printf("%d", uri->port); 379 } else { 380 gsconf->u.tcp.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT); 381 } 382 } 383 384 out: 385 if (qp) { 386 query_params_free(qp); 387 } 388 uri_free(uri); 389 return ret; 390 } 391 392 static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf, 393 Error **errp) 394 { 395 struct glfs *glfs; 396 int ret; 397 int old_errno; 398 GlusterServerList *server; 399 unsigned long long port; 400 401 glfs = glfs_find_preopened(gconf->volume); 402 if (glfs) { 403 return glfs; 404 } 405 406 glfs = glfs_new(gconf->volume); 407 if (!glfs) { 408 goto out; 409 } 410 411 glfs_set_preopened(gconf->volume, glfs); 412 413 for (server = gconf->server; server; server = server->next) { 414 if (server->value->type == GLUSTER_TRANSPORT_UNIX) { 415 ret = glfs_set_volfile_server(glfs, 416 GlusterTransport_lookup[server->value->type], 417 server->value->u.q_unix.path, 0); 418 } else { 419 if (parse_uint_full(server->value->u.tcp.port, &port, 10) < 0 || 420 port > 65535) { 421 error_setg(errp, "'%s' is not a valid port number", 422 server->value->u.tcp.port); 423 errno = EINVAL; 424 goto out; 425 } 426 ret = glfs_set_volfile_server(glfs, 427 GlusterTransport_lookup[server->value->type], 428 server->value->u.tcp.host, 429 (int)port); 430 } 431 432 if (ret < 0) { 433 goto out; 434 } 435 } 436 437 ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug); 438 if (ret < 0) { 439 goto out; 440 } 441 442 ret = glfs_init(glfs); 443 if (ret) { 444 error_setg(errp, "Gluster connection for volume %s, path %s failed" 445 " to connect", gconf->volume, gconf->path); 446 for (server = gconf->server; server; server = server->next) { 447 if (server->value->type == GLUSTER_TRANSPORT_UNIX) { 448 error_append_hint(errp, "hint: failed on socket %s ", 449 server->value->u.q_unix.path); 450 } else { 451 error_append_hint(errp, "hint: failed on host %s and port %s ", 452 server->value->u.tcp.host, 453 server->value->u.tcp.port); 454 } 455 } 456 457 error_append_hint(errp, "Please refer to gluster logs for more info\n"); 458 459 /* glfs_init sometimes doesn't set errno although docs suggest that */ 460 if (errno == 0) { 461 errno = EINVAL; 462 } 463 464 goto out; 465 } 466 return glfs; 467 468 out: 469 if (glfs) { 470 old_errno = errno; 471 glfs_clear_preopened(glfs); 472 errno = old_errno; 473 } 474 return NULL; 475 } 476 477 static int qapi_enum_parse(const char *opt) 478 { 479 int i; 480 481 if (!opt) { 482 return GLUSTER_TRANSPORT__MAX; 483 } 484 485 for (i = 0; i < GLUSTER_TRANSPORT__MAX; i++) { 486 if (!strcmp(opt, GlusterTransport_lookup[i])) { 487 return i; 488 } 489 } 490 491 return i; 492 } 493 494 /* 495 * Convert the json formatted command line into qapi. 496 */ 497 static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf, 498 QDict *options, Error **errp) 499 { 500 QemuOpts *opts; 501 GlusterServer *gsconf; 502 GlusterServerList *curr = NULL; 503 QDict *backing_options = NULL; 504 Error *local_err = NULL; 505 char *str = NULL; 506 const char *ptr; 507 size_t num_servers; 508 int i; 509 510 /* create opts info from runtime_json_opts list */ 511 opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort); 512 qemu_opts_absorb_qdict(opts, options, &local_err); 513 if (local_err) { 514 goto out; 515 } 516 517 num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN); 518 if (num_servers < 1) { 519 error_setg(&local_err, QERR_MISSING_PARAMETER, "server"); 520 goto out; 521 } 522 523 ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME); 524 if (!ptr) { 525 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME); 526 goto out; 527 } 528 gconf->volume = g_strdup(ptr); 529 530 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH); 531 if (!ptr) { 532 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH); 533 goto out; 534 } 535 gconf->path = g_strdup(ptr); 536 qemu_opts_del(opts); 537 538 for (i = 0; i < num_servers; i++) { 539 str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i); 540 qdict_extract_subqdict(options, &backing_options, str); 541 542 /* create opts info from runtime_type_opts list */ 543 opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort); 544 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 545 if (local_err) { 546 goto out; 547 } 548 549 ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE); 550 gsconf = g_new0(GlusterServer, 1); 551 gsconf->type = qapi_enum_parse(ptr); 552 if (!ptr) { 553 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE); 554 error_append_hint(&local_err, GERR_INDEX_HINT, i); 555 goto out; 556 557 } 558 if (gsconf->type == GLUSTER_TRANSPORT__MAX) { 559 error_setg(&local_err, QERR_INVALID_PARAMETER_VALUE, 560 GLUSTER_OPT_TYPE, "tcp or unix"); 561 error_append_hint(&local_err, GERR_INDEX_HINT, i); 562 goto out; 563 } 564 qemu_opts_del(opts); 565 566 if (gsconf->type == GLUSTER_TRANSPORT_TCP) { 567 /* create opts info from runtime_tcp_opts list */ 568 opts = qemu_opts_create(&runtime_tcp_opts, NULL, 0, &error_abort); 569 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 570 if (local_err) { 571 goto out; 572 } 573 574 ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST); 575 if (!ptr) { 576 error_setg(&local_err, QERR_MISSING_PARAMETER, 577 GLUSTER_OPT_HOST); 578 error_append_hint(&local_err, GERR_INDEX_HINT, i); 579 goto out; 580 } 581 gsconf->u.tcp.host = g_strdup(ptr); 582 ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT); 583 if (!ptr) { 584 error_setg(&local_err, QERR_MISSING_PARAMETER, 585 GLUSTER_OPT_PORT); 586 error_append_hint(&local_err, GERR_INDEX_HINT, i); 587 goto out; 588 } 589 gsconf->u.tcp.port = g_strdup(ptr); 590 591 /* defend for unsupported fields in InetSocketAddress, 592 * i.e. @ipv4, @ipv6 and @to 593 */ 594 ptr = qemu_opt_get(opts, GLUSTER_OPT_TO); 595 if (ptr) { 596 gsconf->u.tcp.has_to = true; 597 } 598 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4); 599 if (ptr) { 600 gsconf->u.tcp.has_ipv4 = true; 601 } 602 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6); 603 if (ptr) { 604 gsconf->u.tcp.has_ipv6 = true; 605 } 606 if (gsconf->u.tcp.has_to) { 607 error_setg(&local_err, "Parameter 'to' not supported"); 608 goto out; 609 } 610 if (gsconf->u.tcp.has_ipv4 || gsconf->u.tcp.has_ipv6) { 611 error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported"); 612 goto out; 613 } 614 qemu_opts_del(opts); 615 } else { 616 /* create opts info from runtime_unix_opts list */ 617 opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort); 618 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 619 if (local_err) { 620 goto out; 621 } 622 623 ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET); 624 if (!ptr) { 625 error_setg(&local_err, QERR_MISSING_PARAMETER, 626 GLUSTER_OPT_SOCKET); 627 error_append_hint(&local_err, GERR_INDEX_HINT, i); 628 goto out; 629 } 630 gsconf->u.q_unix.path = g_strdup(ptr); 631 qemu_opts_del(opts); 632 } 633 634 if (gconf->server == NULL) { 635 gconf->server = g_new0(GlusterServerList, 1); 636 gconf->server->value = gsconf; 637 curr = gconf->server; 638 } else { 639 curr->next = g_new0(GlusterServerList, 1); 640 curr->next->value = gsconf; 641 curr = curr->next; 642 } 643 644 qdict_del(backing_options, str); 645 g_free(str); 646 str = NULL; 647 } 648 649 return 0; 650 651 out: 652 error_propagate(errp, local_err); 653 qemu_opts_del(opts); 654 if (str) { 655 qdict_del(backing_options, str); 656 g_free(str); 657 } 658 errno = EINVAL; 659 return -errno; 660 } 661 662 static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf, 663 const char *filename, 664 QDict *options, Error **errp) 665 { 666 int ret; 667 if (filename) { 668 ret = qemu_gluster_parse_uri(gconf, filename); 669 if (ret < 0) { 670 error_setg(errp, "invalid URI"); 671 error_append_hint(errp, "Usage: file=gluster[+transport]://" 672 "[host[:port]]volume/path[?socket=...]" 673 "[,file.debug=N]" 674 "[,file.logfile=/path/filename.log]\n"); 675 errno = -ret; 676 return NULL; 677 } 678 } else { 679 ret = qemu_gluster_parse_json(gconf, options, errp); 680 if (ret < 0) { 681 error_append_hint(errp, "Usage: " 682 "-drive driver=qcow2,file.driver=gluster," 683 "file.volume=testvol,file.path=/path/a.qcow2" 684 "[,file.debug=9]" 685 "[,file.logfile=/path/filename.log]," 686 "file.server.0.type=tcp," 687 "file.server.0.host=1.2.3.4," 688 "file.server.0.port=24007," 689 "file.server.1.transport=unix," 690 "file.server.1.socket=/var/run/glusterd.socket ..." 691 "\n"); 692 errno = -ret; 693 return NULL; 694 } 695 696 } 697 698 return qemu_gluster_glfs_init(gconf, errp); 699 } 700 701 static void qemu_gluster_complete_aio(void *opaque) 702 { 703 GlusterAIOCB *acb = (GlusterAIOCB *)opaque; 704 705 qemu_coroutine_enter(acb->coroutine); 706 } 707 708 /* 709 * AIO callback routine called from GlusterFS thread. 710 */ 711 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg) 712 { 713 GlusterAIOCB *acb = (GlusterAIOCB *)arg; 714 715 if (!ret || ret == acb->size) { 716 acb->ret = 0; /* Success */ 717 } else if (ret < 0) { 718 acb->ret = -errno; /* Read/Write failed */ 719 } else { 720 acb->ret = -EIO; /* Partial read/write - fail it */ 721 } 722 723 aio_bh_schedule_oneshot(acb->aio_context, qemu_gluster_complete_aio, acb); 724 } 725 726 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags) 727 { 728 assert(open_flags != NULL); 729 730 *open_flags |= O_BINARY; 731 732 if (bdrv_flags & BDRV_O_RDWR) { 733 *open_flags |= O_RDWR; 734 } else { 735 *open_flags |= O_RDONLY; 736 } 737 738 if ((bdrv_flags & BDRV_O_NOCACHE)) { 739 *open_flags |= O_DIRECT; 740 } 741 } 742 743 /* 744 * Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of 745 * gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used. 746 * - Corrected versions return -1 and set errno to EINVAL. 747 * - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set 748 * errno to ENXIO when SEEK_DATA is called with a position of EOF. 749 */ 750 static bool qemu_gluster_test_seek(struct glfs_fd *fd) 751 { 752 off_t ret = 0; 753 754 #if defined SEEK_HOLE && defined SEEK_DATA 755 off_t eof; 756 757 eof = glfs_lseek(fd, 0, SEEK_END); 758 if (eof < 0) { 759 /* this should never occur */ 760 return false; 761 } 762 763 /* this should always fail with ENXIO if SEEK_DATA is supported */ 764 ret = glfs_lseek(fd, eof, SEEK_DATA); 765 #endif 766 767 return (ret < 0) && (errno == ENXIO); 768 } 769 770 static int qemu_gluster_open(BlockDriverState *bs, QDict *options, 771 int bdrv_flags, Error **errp) 772 { 773 BDRVGlusterState *s = bs->opaque; 774 int open_flags = 0; 775 int ret = 0; 776 BlockdevOptionsGluster *gconf = NULL; 777 QemuOpts *opts; 778 Error *local_err = NULL; 779 const char *filename, *logfile; 780 781 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 782 qemu_opts_absorb_qdict(opts, options, &local_err); 783 if (local_err) { 784 error_propagate(errp, local_err); 785 ret = -EINVAL; 786 goto out; 787 } 788 789 filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME); 790 791 s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG, 792 GLUSTER_DEBUG_DEFAULT); 793 if (s->debug < 0) { 794 s->debug = 0; 795 } else if (s->debug > GLUSTER_DEBUG_MAX) { 796 s->debug = GLUSTER_DEBUG_MAX; 797 } 798 799 gconf = g_new0(BlockdevOptionsGluster, 1); 800 gconf->debug = s->debug; 801 gconf->has_debug = true; 802 803 logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE); 804 s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT); 805 806 gconf->logfile = g_strdup(s->logfile); 807 gconf->has_logfile = true; 808 809 s->glfs = qemu_gluster_init(gconf, filename, options, errp); 810 if (!s->glfs) { 811 ret = -errno; 812 goto out; 813 } 814 815 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT 816 /* Without this, if fsync fails for a recoverable reason (for instance, 817 * ENOSPC), gluster will dump its cache, preventing retries. This means 818 * almost certain data loss. Not all gluster versions support the 819 * 'resync-failed-syncs-after-fsync' key value, but there is no way to 820 * discover during runtime if it is supported (this api returns success for 821 * unknown key/value pairs) */ 822 ret = glfs_set_xlator_option(s->glfs, "*-write-behind", 823 "resync-failed-syncs-after-fsync", 824 "on"); 825 if (ret < 0) { 826 error_setg_errno(errp, errno, "Unable to set xlator key/value pair"); 827 ret = -errno; 828 goto out; 829 } 830 #endif 831 832 qemu_gluster_parse_flags(bdrv_flags, &open_flags); 833 834 s->fd = glfs_open(s->glfs, gconf->path, open_flags); 835 if (!s->fd) { 836 ret = -errno; 837 } 838 839 s->supports_seek_data = qemu_gluster_test_seek(s->fd); 840 841 out: 842 qemu_opts_del(opts); 843 qapi_free_BlockdevOptionsGluster(gconf); 844 if (!ret) { 845 return ret; 846 } 847 g_free(s->logfile); 848 if (s->fd) { 849 glfs_close(s->fd); 850 } 851 852 glfs_clear_preopened(s->glfs); 853 854 return ret; 855 } 856 857 static int qemu_gluster_reopen_prepare(BDRVReopenState *state, 858 BlockReopenQueue *queue, Error **errp) 859 { 860 int ret = 0; 861 BDRVGlusterState *s; 862 BDRVGlusterReopenState *reop_s; 863 BlockdevOptionsGluster *gconf; 864 int open_flags = 0; 865 866 assert(state != NULL); 867 assert(state->bs != NULL); 868 869 s = state->bs->opaque; 870 871 state->opaque = g_new0(BDRVGlusterReopenState, 1); 872 reop_s = state->opaque; 873 874 qemu_gluster_parse_flags(state->flags, &open_flags); 875 876 gconf = g_new0(BlockdevOptionsGluster, 1); 877 gconf->debug = s->debug; 878 gconf->has_debug = true; 879 gconf->logfile = g_strdup(s->logfile); 880 gconf->has_logfile = true; 881 reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL, errp); 882 if (reop_s->glfs == NULL) { 883 ret = -errno; 884 goto exit; 885 } 886 887 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT 888 ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind", 889 "resync-failed-syncs-after-fsync", "on"); 890 if (ret < 0) { 891 error_setg_errno(errp, errno, "Unable to set xlator key/value pair"); 892 ret = -errno; 893 goto exit; 894 } 895 #endif 896 897 reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags); 898 if (reop_s->fd == NULL) { 899 /* reops->glfs will be cleaned up in _abort */ 900 ret = -errno; 901 goto exit; 902 } 903 904 exit: 905 /* state->opaque will be freed in either the _abort or _commit */ 906 qapi_free_BlockdevOptionsGluster(gconf); 907 return ret; 908 } 909 910 static void qemu_gluster_reopen_commit(BDRVReopenState *state) 911 { 912 BDRVGlusterReopenState *reop_s = state->opaque; 913 BDRVGlusterState *s = state->bs->opaque; 914 915 916 /* close the old */ 917 if (s->fd) { 918 glfs_close(s->fd); 919 } 920 921 glfs_clear_preopened(s->glfs); 922 923 /* use the newly opened image / connection */ 924 s->fd = reop_s->fd; 925 s->glfs = reop_s->glfs; 926 927 g_free(state->opaque); 928 state->opaque = NULL; 929 930 return; 931 } 932 933 934 static void qemu_gluster_reopen_abort(BDRVReopenState *state) 935 { 936 BDRVGlusterReopenState *reop_s = state->opaque; 937 938 if (reop_s == NULL) { 939 return; 940 } 941 942 if (reop_s->fd) { 943 glfs_close(reop_s->fd); 944 } 945 946 glfs_clear_preopened(reop_s->glfs); 947 948 g_free(state->opaque); 949 state->opaque = NULL; 950 951 return; 952 } 953 954 #ifdef CONFIG_GLUSTERFS_ZEROFILL 955 static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs, 956 int64_t offset, 957 int size, 958 BdrvRequestFlags flags) 959 { 960 int ret; 961 GlusterAIOCB acb; 962 BDRVGlusterState *s = bs->opaque; 963 964 acb.size = size; 965 acb.ret = 0; 966 acb.coroutine = qemu_coroutine_self(); 967 acb.aio_context = bdrv_get_aio_context(bs); 968 969 ret = glfs_zerofill_async(s->fd, offset, size, gluster_finish_aiocb, &acb); 970 if (ret < 0) { 971 return -errno; 972 } 973 974 qemu_coroutine_yield(); 975 return acb.ret; 976 } 977 978 static inline bool gluster_supports_zerofill(void) 979 { 980 return 1; 981 } 982 983 static inline int qemu_gluster_zerofill(struct glfs_fd *fd, int64_t offset, 984 int64_t size) 985 { 986 return glfs_zerofill(fd, offset, size); 987 } 988 989 #else 990 static inline bool gluster_supports_zerofill(void) 991 { 992 return 0; 993 } 994 995 static inline int qemu_gluster_zerofill(struct glfs_fd *fd, int64_t offset, 996 int64_t size) 997 { 998 return 0; 999 } 1000 #endif 1001 1002 static int qemu_gluster_create(const char *filename, 1003 QemuOpts *opts, Error **errp) 1004 { 1005 BlockdevOptionsGluster *gconf; 1006 struct glfs *glfs; 1007 struct glfs_fd *fd; 1008 int ret = 0; 1009 int prealloc = 0; 1010 int64_t total_size = 0; 1011 char *tmp = NULL; 1012 1013 gconf = g_new0(BlockdevOptionsGluster, 1); 1014 gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG, 1015 GLUSTER_DEBUG_DEFAULT); 1016 if (gconf->debug < 0) { 1017 gconf->debug = 0; 1018 } else if (gconf->debug > GLUSTER_DEBUG_MAX) { 1019 gconf->debug = GLUSTER_DEBUG_MAX; 1020 } 1021 gconf->has_debug = true; 1022 1023 gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE); 1024 if (!gconf->logfile) { 1025 gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT); 1026 } 1027 gconf->has_logfile = true; 1028 1029 glfs = qemu_gluster_init(gconf, filename, NULL, errp); 1030 if (!glfs) { 1031 ret = -errno; 1032 goto out; 1033 } 1034 1035 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1036 BDRV_SECTOR_SIZE); 1037 1038 tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); 1039 if (!tmp || !strcmp(tmp, "off")) { 1040 prealloc = 0; 1041 } else if (!strcmp(tmp, "full") && gluster_supports_zerofill()) { 1042 prealloc = 1; 1043 } else { 1044 error_setg(errp, "Invalid preallocation mode: '%s'" 1045 " or GlusterFS doesn't support zerofill API", tmp); 1046 ret = -EINVAL; 1047 goto out; 1048 } 1049 1050 fd = glfs_creat(glfs, gconf->path, 1051 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR); 1052 if (!fd) { 1053 ret = -errno; 1054 } else { 1055 if (!glfs_ftruncate(fd, total_size)) { 1056 if (prealloc && qemu_gluster_zerofill(fd, 0, total_size)) { 1057 ret = -errno; 1058 } 1059 } else { 1060 ret = -errno; 1061 } 1062 1063 if (glfs_close(fd) != 0) { 1064 ret = -errno; 1065 } 1066 } 1067 out: 1068 g_free(tmp); 1069 qapi_free_BlockdevOptionsGluster(gconf); 1070 glfs_clear_preopened(glfs); 1071 return ret; 1072 } 1073 1074 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs, 1075 int64_t sector_num, int nb_sectors, 1076 QEMUIOVector *qiov, int write) 1077 { 1078 int ret; 1079 GlusterAIOCB acb; 1080 BDRVGlusterState *s = bs->opaque; 1081 size_t size = nb_sectors * BDRV_SECTOR_SIZE; 1082 off_t offset = sector_num * BDRV_SECTOR_SIZE; 1083 1084 acb.size = size; 1085 acb.ret = 0; 1086 acb.coroutine = qemu_coroutine_self(); 1087 acb.aio_context = bdrv_get_aio_context(bs); 1088 1089 if (write) { 1090 ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0, 1091 gluster_finish_aiocb, &acb); 1092 } else { 1093 ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0, 1094 gluster_finish_aiocb, &acb); 1095 } 1096 1097 if (ret < 0) { 1098 return -errno; 1099 } 1100 1101 qemu_coroutine_yield(); 1102 return acb.ret; 1103 } 1104 1105 static int qemu_gluster_truncate(BlockDriverState *bs, int64_t offset) 1106 { 1107 int ret; 1108 BDRVGlusterState *s = bs->opaque; 1109 1110 ret = glfs_ftruncate(s->fd, offset); 1111 if (ret < 0) { 1112 return -errno; 1113 } 1114 1115 return 0; 1116 } 1117 1118 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs, 1119 int64_t sector_num, 1120 int nb_sectors, 1121 QEMUIOVector *qiov) 1122 { 1123 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0); 1124 } 1125 1126 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs, 1127 int64_t sector_num, 1128 int nb_sectors, 1129 QEMUIOVector *qiov) 1130 { 1131 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1); 1132 } 1133 1134 static void qemu_gluster_close(BlockDriverState *bs) 1135 { 1136 BDRVGlusterState *s = bs->opaque; 1137 1138 g_free(s->logfile); 1139 if (s->fd) { 1140 glfs_close(s->fd); 1141 s->fd = NULL; 1142 } 1143 glfs_clear_preopened(s->glfs); 1144 } 1145 1146 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs) 1147 { 1148 int ret; 1149 GlusterAIOCB acb; 1150 BDRVGlusterState *s = bs->opaque; 1151 1152 acb.size = 0; 1153 acb.ret = 0; 1154 acb.coroutine = qemu_coroutine_self(); 1155 acb.aio_context = bdrv_get_aio_context(bs); 1156 1157 ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb); 1158 if (ret < 0) { 1159 ret = -errno; 1160 goto error; 1161 } 1162 1163 qemu_coroutine_yield(); 1164 if (acb.ret < 0) { 1165 ret = acb.ret; 1166 goto error; 1167 } 1168 1169 return acb.ret; 1170 1171 error: 1172 /* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache 1173 * after a fsync failure, so we have no way of allowing the guest to safely 1174 * continue. Gluster versions prior to 3.5.6 don't retain the cache 1175 * either, but will invalidate the fd on error, so this is again our only 1176 * option. 1177 * 1178 * The 'resync-failed-syncs-after-fsync' xlator option for the 1179 * write-behind cache will cause later gluster versions to retain its 1180 * cache after error, so long as the fd remains open. However, we 1181 * currently have no way of knowing if this option is supported. 1182 * 1183 * TODO: Once gluster provides a way for us to determine if the option 1184 * is supported, bypass the closure and setting drv to NULL. */ 1185 qemu_gluster_close(bs); 1186 bs->drv = NULL; 1187 return ret; 1188 } 1189 1190 #ifdef CONFIG_GLUSTERFS_DISCARD 1191 static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs, 1192 int64_t offset, int size) 1193 { 1194 int ret; 1195 GlusterAIOCB acb; 1196 BDRVGlusterState *s = bs->opaque; 1197 1198 acb.size = 0; 1199 acb.ret = 0; 1200 acb.coroutine = qemu_coroutine_self(); 1201 acb.aio_context = bdrv_get_aio_context(bs); 1202 1203 ret = glfs_discard_async(s->fd, offset, size, gluster_finish_aiocb, &acb); 1204 if (ret < 0) { 1205 return -errno; 1206 } 1207 1208 qemu_coroutine_yield(); 1209 return acb.ret; 1210 } 1211 #endif 1212 1213 static int64_t qemu_gluster_getlength(BlockDriverState *bs) 1214 { 1215 BDRVGlusterState *s = bs->opaque; 1216 int64_t ret; 1217 1218 ret = glfs_lseek(s->fd, 0, SEEK_END); 1219 if (ret < 0) { 1220 return -errno; 1221 } else { 1222 return ret; 1223 } 1224 } 1225 1226 static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs) 1227 { 1228 BDRVGlusterState *s = bs->opaque; 1229 struct stat st; 1230 int ret; 1231 1232 ret = glfs_fstat(s->fd, &st); 1233 if (ret < 0) { 1234 return -errno; 1235 } else { 1236 return st.st_blocks * 512; 1237 } 1238 } 1239 1240 static int qemu_gluster_has_zero_init(BlockDriverState *bs) 1241 { 1242 /* GlusterFS volume could be backed by a block device */ 1243 return 0; 1244 } 1245 1246 /* 1247 * Find allocation range in @bs around offset @start. 1248 * May change underlying file descriptor's file offset. 1249 * If @start is not in a hole, store @start in @data, and the 1250 * beginning of the next hole in @hole, and return 0. 1251 * If @start is in a non-trailing hole, store @start in @hole and the 1252 * beginning of the next non-hole in @data, and return 0. 1253 * If @start is in a trailing hole or beyond EOF, return -ENXIO. 1254 * If we can't find out, return a negative errno other than -ENXIO. 1255 * 1256 * (Shamefully copied from file-posix.c, only miniscule adaptions.) 1257 */ 1258 static int find_allocation(BlockDriverState *bs, off_t start, 1259 off_t *data, off_t *hole) 1260 { 1261 BDRVGlusterState *s = bs->opaque; 1262 1263 if (!s->supports_seek_data) { 1264 goto exit; 1265 } 1266 1267 #if defined SEEK_HOLE && defined SEEK_DATA 1268 off_t offs; 1269 1270 /* 1271 * SEEK_DATA cases: 1272 * D1. offs == start: start is in data 1273 * D2. offs > start: start is in a hole, next data at offs 1274 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole 1275 * or start is beyond EOF 1276 * If the latter happens, the file has been truncated behind 1277 * our back since we opened it. All bets are off then. 1278 * Treating like a trailing hole is simplest. 1279 * D4. offs < 0, errno != ENXIO: we learned nothing 1280 */ 1281 offs = glfs_lseek(s->fd, start, SEEK_DATA); 1282 if (offs < 0) { 1283 return -errno; /* D3 or D4 */ 1284 } 1285 assert(offs >= start); 1286 1287 if (offs > start) { 1288 /* D2: in hole, next data at offs */ 1289 *hole = start; 1290 *data = offs; 1291 return 0; 1292 } 1293 1294 /* D1: in data, end not yet known */ 1295 1296 /* 1297 * SEEK_HOLE cases: 1298 * H1. offs == start: start is in a hole 1299 * If this happens here, a hole has been dug behind our back 1300 * since the previous lseek(). 1301 * H2. offs > start: either start is in data, next hole at offs, 1302 * or start is in trailing hole, EOF at offs 1303 * Linux treats trailing holes like any other hole: offs == 1304 * start. Solaris seeks to EOF instead: offs > start (blech). 1305 * If that happens here, a hole has been dug behind our back 1306 * since the previous lseek(). 1307 * H3. offs < 0, errno = ENXIO: start is beyond EOF 1308 * If this happens, the file has been truncated behind our 1309 * back since we opened it. Treat it like a trailing hole. 1310 * H4. offs < 0, errno != ENXIO: we learned nothing 1311 * Pretend we know nothing at all, i.e. "forget" about D1. 1312 */ 1313 offs = glfs_lseek(s->fd, start, SEEK_HOLE); 1314 if (offs < 0) { 1315 return -errno; /* D1 and (H3 or H4) */ 1316 } 1317 assert(offs >= start); 1318 1319 if (offs > start) { 1320 /* 1321 * D1 and H2: either in data, next hole at offs, or it was in 1322 * data but is now in a trailing hole. In the latter case, 1323 * all bets are off. Treating it as if it there was data all 1324 * the way to EOF is safe, so simply do that. 1325 */ 1326 *data = start; 1327 *hole = offs; 1328 return 0; 1329 } 1330 1331 /* D1 and H1 */ 1332 return -EBUSY; 1333 #endif 1334 1335 exit: 1336 return -ENOTSUP; 1337 } 1338 1339 /* 1340 * Returns the allocation status of the specified sectors. 1341 * 1342 * If 'sector_num' is beyond the end of the disk image the return value is 0 1343 * and 'pnum' is set to 0. 1344 * 1345 * 'pnum' is set to the number of sectors (including and immediately following 1346 * the specified sector) that are known to be in the same 1347 * allocated/unallocated state. 1348 * 1349 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes 1350 * beyond the end of the disk image it will be clamped. 1351 * 1352 * (Based on raw_co_get_block_status() from file-posix.c.) 1353 */ 1354 static int64_t coroutine_fn qemu_gluster_co_get_block_status( 1355 BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum, 1356 BlockDriverState **file) 1357 { 1358 BDRVGlusterState *s = bs->opaque; 1359 off_t start, data = 0, hole = 0; 1360 int64_t total_size; 1361 int ret = -EINVAL; 1362 1363 if (!s->fd) { 1364 return ret; 1365 } 1366 1367 start = sector_num * BDRV_SECTOR_SIZE; 1368 total_size = bdrv_getlength(bs); 1369 if (total_size < 0) { 1370 return total_size; 1371 } else if (start >= total_size) { 1372 *pnum = 0; 1373 return 0; 1374 } else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) { 1375 nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE); 1376 } 1377 1378 ret = find_allocation(bs, start, &data, &hole); 1379 if (ret == -ENXIO) { 1380 /* Trailing hole */ 1381 *pnum = nb_sectors; 1382 ret = BDRV_BLOCK_ZERO; 1383 } else if (ret < 0) { 1384 /* No info available, so pretend there are no holes */ 1385 *pnum = nb_sectors; 1386 ret = BDRV_BLOCK_DATA; 1387 } else if (data == start) { 1388 /* On a data extent, compute sectors to the end of the extent, 1389 * possibly including a partial sector at EOF. */ 1390 *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE)); 1391 ret = BDRV_BLOCK_DATA; 1392 } else { 1393 /* On a hole, compute sectors to the beginning of the next extent. */ 1394 assert(hole == start); 1395 *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE); 1396 ret = BDRV_BLOCK_ZERO; 1397 } 1398 1399 *file = bs; 1400 1401 return ret | BDRV_BLOCK_OFFSET_VALID | start; 1402 } 1403 1404 1405 static BlockDriver bdrv_gluster = { 1406 .format_name = "gluster", 1407 .protocol_name = "gluster", 1408 .instance_size = sizeof(BDRVGlusterState), 1409 .bdrv_needs_filename = false, 1410 .bdrv_file_open = qemu_gluster_open, 1411 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1412 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1413 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1414 .bdrv_close = qemu_gluster_close, 1415 .bdrv_create = qemu_gluster_create, 1416 .bdrv_getlength = qemu_gluster_getlength, 1417 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1418 .bdrv_truncate = qemu_gluster_truncate, 1419 .bdrv_co_readv = qemu_gluster_co_readv, 1420 .bdrv_co_writev = qemu_gluster_co_writev, 1421 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1422 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1423 #ifdef CONFIG_GLUSTERFS_DISCARD 1424 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1425 #endif 1426 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1427 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1428 #endif 1429 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status, 1430 .create_opts = &qemu_gluster_create_opts, 1431 }; 1432 1433 static BlockDriver bdrv_gluster_tcp = { 1434 .format_name = "gluster", 1435 .protocol_name = "gluster+tcp", 1436 .instance_size = sizeof(BDRVGlusterState), 1437 .bdrv_needs_filename = false, 1438 .bdrv_file_open = qemu_gluster_open, 1439 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1440 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1441 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1442 .bdrv_close = qemu_gluster_close, 1443 .bdrv_create = qemu_gluster_create, 1444 .bdrv_getlength = qemu_gluster_getlength, 1445 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1446 .bdrv_truncate = qemu_gluster_truncate, 1447 .bdrv_co_readv = qemu_gluster_co_readv, 1448 .bdrv_co_writev = qemu_gluster_co_writev, 1449 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1450 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1451 #ifdef CONFIG_GLUSTERFS_DISCARD 1452 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1453 #endif 1454 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1455 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1456 #endif 1457 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status, 1458 .create_opts = &qemu_gluster_create_opts, 1459 }; 1460 1461 static BlockDriver bdrv_gluster_unix = { 1462 .format_name = "gluster", 1463 .protocol_name = "gluster+unix", 1464 .instance_size = sizeof(BDRVGlusterState), 1465 .bdrv_needs_filename = true, 1466 .bdrv_file_open = qemu_gluster_open, 1467 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1468 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1469 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1470 .bdrv_close = qemu_gluster_close, 1471 .bdrv_create = qemu_gluster_create, 1472 .bdrv_getlength = qemu_gluster_getlength, 1473 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1474 .bdrv_truncate = qemu_gluster_truncate, 1475 .bdrv_co_readv = qemu_gluster_co_readv, 1476 .bdrv_co_writev = qemu_gluster_co_writev, 1477 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1478 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1479 #ifdef CONFIG_GLUSTERFS_DISCARD 1480 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1481 #endif 1482 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1483 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1484 #endif 1485 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status, 1486 .create_opts = &qemu_gluster_create_opts, 1487 }; 1488 1489 /* rdma is deprecated (actually never supported for volfile fetch). 1490 * Let's maintain it for the protocol compatibility, to make sure things 1491 * won't break immediately. For now, gluster+rdma will fall back to gluster+tcp 1492 * protocol with a warning. 1493 * TODO: remove gluster+rdma interface support 1494 */ 1495 static BlockDriver bdrv_gluster_rdma = { 1496 .format_name = "gluster", 1497 .protocol_name = "gluster+rdma", 1498 .instance_size = sizeof(BDRVGlusterState), 1499 .bdrv_needs_filename = true, 1500 .bdrv_file_open = qemu_gluster_open, 1501 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1502 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1503 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1504 .bdrv_close = qemu_gluster_close, 1505 .bdrv_create = qemu_gluster_create, 1506 .bdrv_getlength = qemu_gluster_getlength, 1507 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1508 .bdrv_truncate = qemu_gluster_truncate, 1509 .bdrv_co_readv = qemu_gluster_co_readv, 1510 .bdrv_co_writev = qemu_gluster_co_writev, 1511 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1512 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1513 #ifdef CONFIG_GLUSTERFS_DISCARD 1514 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1515 #endif 1516 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1517 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1518 #endif 1519 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status, 1520 .create_opts = &qemu_gluster_create_opts, 1521 }; 1522 1523 static void bdrv_gluster_init(void) 1524 { 1525 bdrv_register(&bdrv_gluster_rdma); 1526 bdrv_register(&bdrv_gluster_unix); 1527 bdrv_register(&bdrv_gluster_tcp); 1528 bdrv_register(&bdrv_gluster); 1529 } 1530 1531 block_init(bdrv_gluster_init); 1532