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 = "inet|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_inet_opts = { 174 .name = "gluster_inet", 175 .head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head), 176 .desc = { 177 { 178 .name = GLUSTER_OPT_TYPE, 179 .type = QEMU_OPT_STRING, 180 .help = "inet|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 SocketAddress *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(SocketAddressList, 1); 335 gconf->server->value = gsconf = g_new0(SocketAddress, 1); 336 337 /* transport */ 338 if (!uri->scheme || !strcmp(uri->scheme, "gluster")) { 339 gsconf->type = SOCKET_ADDRESS_TYPE_INET; 340 } else if (!strcmp(uri->scheme, "gluster+tcp")) { 341 gsconf->type = SOCKET_ADDRESS_TYPE_INET; 342 } else if (!strcmp(uri->scheme, "gluster+unix")) { 343 gsconf->type = SOCKET_ADDRESS_TYPE_UNIX; 344 is_unix = true; 345 } else if (!strcmp(uri->scheme, "gluster+rdma")) { 346 gsconf->type = SOCKET_ADDRESS_TYPE_INET; 347 warn_report("rdma feature is not supported, falling back to tcp"); 348 } else { 349 ret = -EINVAL; 350 goto out; 351 } 352 353 ret = parse_volume_options(gconf, uri->path); 354 if (ret < 0) { 355 goto out; 356 } 357 358 qp = query_params_parse(uri->query); 359 if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { 360 ret = -EINVAL; 361 goto out; 362 } 363 364 if (is_unix) { 365 if (uri->server || uri->port) { 366 ret = -EINVAL; 367 goto out; 368 } 369 if (strcmp(qp->p[0].name, "socket")) { 370 ret = -EINVAL; 371 goto out; 372 } 373 gsconf->u.q_unix.path = g_strdup(qp->p[0].value); 374 } else { 375 gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost"); 376 if (uri->port) { 377 gsconf->u.inet.port = g_strdup_printf("%d", uri->port); 378 } else { 379 gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT); 380 } 381 } 382 383 out: 384 if (qp) { 385 query_params_free(qp); 386 } 387 uri_free(uri); 388 return ret; 389 } 390 391 static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf, 392 Error **errp) 393 { 394 struct glfs *glfs; 395 int ret; 396 int old_errno; 397 SocketAddressList *server; 398 unsigned long long port; 399 400 glfs = glfs_find_preopened(gconf->volume); 401 if (glfs) { 402 return glfs; 403 } 404 405 glfs = glfs_new(gconf->volume); 406 if (!glfs) { 407 goto out; 408 } 409 410 glfs_set_preopened(gconf->volume, glfs); 411 412 for (server = gconf->server; server; server = server->next) { 413 switch (server->value->type) { 414 case SOCKET_ADDRESS_TYPE_UNIX: 415 ret = glfs_set_volfile_server(glfs, "unix", 416 server->value->u.q_unix.path, 0); 417 break; 418 case SOCKET_ADDRESS_TYPE_INET: 419 if (parse_uint_full(server->value->u.inet.port, &port, 10) < 0 || 420 port > 65535) { 421 error_setg(errp, "'%s' is not a valid port number", 422 server->value->u.inet.port); 423 errno = EINVAL; 424 goto out; 425 } 426 ret = glfs_set_volfile_server(glfs, "tcp", 427 server->value->u.inet.host, 428 (int)port); 429 break; 430 case SOCKET_ADDRESS_TYPE_VSOCK: 431 case SOCKET_ADDRESS_TYPE_FD: 432 default: 433 abort(); 434 } 435 436 if (ret < 0) { 437 goto out; 438 } 439 } 440 441 ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug); 442 if (ret < 0) { 443 goto out; 444 } 445 446 ret = glfs_init(glfs); 447 if (ret) { 448 error_setg(errp, "Gluster connection for volume %s, path %s failed" 449 " to connect", gconf->volume, gconf->path); 450 for (server = gconf->server; server; server = server->next) { 451 if (server->value->type == SOCKET_ADDRESS_TYPE_UNIX) { 452 error_append_hint(errp, "hint: failed on socket %s ", 453 server->value->u.q_unix.path); 454 } else { 455 error_append_hint(errp, "hint: failed on host %s and port %s ", 456 server->value->u.inet.host, 457 server->value->u.inet.port); 458 } 459 } 460 461 error_append_hint(errp, "Please refer to gluster logs for more info\n"); 462 463 /* glfs_init sometimes doesn't set errno although docs suggest that */ 464 if (errno == 0) { 465 errno = EINVAL; 466 } 467 468 goto out; 469 } 470 return glfs; 471 472 out: 473 if (glfs) { 474 old_errno = errno; 475 glfs_clear_preopened(glfs); 476 errno = old_errno; 477 } 478 return NULL; 479 } 480 481 /* 482 * Convert the json formatted command line into qapi. 483 */ 484 static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf, 485 QDict *options, Error **errp) 486 { 487 QemuOpts *opts; 488 SocketAddress *gsconf = NULL; 489 SocketAddressList *curr = NULL; 490 QDict *backing_options = NULL; 491 Error *local_err = NULL; 492 char *str = NULL; 493 const char *ptr; 494 int i, type, num_servers; 495 496 /* create opts info from runtime_json_opts list */ 497 opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort); 498 qemu_opts_absorb_qdict(opts, options, &local_err); 499 if (local_err) { 500 goto out; 501 } 502 503 num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN); 504 if (num_servers < 1) { 505 error_setg(&local_err, QERR_MISSING_PARAMETER, "server"); 506 goto out; 507 } 508 509 ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME); 510 if (!ptr) { 511 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME); 512 goto out; 513 } 514 gconf->volume = g_strdup(ptr); 515 516 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH); 517 if (!ptr) { 518 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH); 519 goto out; 520 } 521 gconf->path = g_strdup(ptr); 522 qemu_opts_del(opts); 523 524 for (i = 0; i < num_servers; i++) { 525 str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i); 526 qdict_extract_subqdict(options, &backing_options, str); 527 528 /* create opts info from runtime_type_opts list */ 529 opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort); 530 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 531 if (local_err) { 532 goto out; 533 } 534 535 ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE); 536 if (!ptr) { 537 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE); 538 error_append_hint(&local_err, GERR_INDEX_HINT, i); 539 goto out; 540 541 } 542 gsconf = g_new0(SocketAddress, 1); 543 if (!strcmp(ptr, "tcp")) { 544 ptr = "inet"; /* accept legacy "tcp" */ 545 } 546 type = qapi_enum_parse(&SocketAddressType_lookup, ptr, -1, NULL); 547 if (type != SOCKET_ADDRESS_TYPE_INET 548 && type != SOCKET_ADDRESS_TYPE_UNIX) { 549 error_setg(&local_err, 550 "Parameter '%s' may be 'inet' or 'unix'", 551 GLUSTER_OPT_TYPE); 552 error_append_hint(&local_err, GERR_INDEX_HINT, i); 553 goto out; 554 } 555 gsconf->type = type; 556 qemu_opts_del(opts); 557 558 if (gsconf->type == SOCKET_ADDRESS_TYPE_INET) { 559 /* create opts info from runtime_inet_opts list */ 560 opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort); 561 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 562 if (local_err) { 563 goto out; 564 } 565 566 ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST); 567 if (!ptr) { 568 error_setg(&local_err, QERR_MISSING_PARAMETER, 569 GLUSTER_OPT_HOST); 570 error_append_hint(&local_err, GERR_INDEX_HINT, i); 571 goto out; 572 } 573 gsconf->u.inet.host = g_strdup(ptr); 574 ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT); 575 if (!ptr) { 576 error_setg(&local_err, QERR_MISSING_PARAMETER, 577 GLUSTER_OPT_PORT); 578 error_append_hint(&local_err, GERR_INDEX_HINT, i); 579 goto out; 580 } 581 gsconf->u.inet.port = g_strdup(ptr); 582 583 /* defend for unsupported fields in InetSocketAddress, 584 * i.e. @ipv4, @ipv6 and @to 585 */ 586 ptr = qemu_opt_get(opts, GLUSTER_OPT_TO); 587 if (ptr) { 588 gsconf->u.inet.has_to = true; 589 } 590 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4); 591 if (ptr) { 592 gsconf->u.inet.has_ipv4 = true; 593 } 594 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6); 595 if (ptr) { 596 gsconf->u.inet.has_ipv6 = true; 597 } 598 if (gsconf->u.inet.has_to) { 599 error_setg(&local_err, "Parameter 'to' not supported"); 600 goto out; 601 } 602 if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) { 603 error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported"); 604 goto out; 605 } 606 qemu_opts_del(opts); 607 } else { 608 /* create opts info from runtime_unix_opts list */ 609 opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort); 610 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 611 if (local_err) { 612 goto out; 613 } 614 615 ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET); 616 if (!ptr) { 617 error_setg(&local_err, QERR_MISSING_PARAMETER, 618 GLUSTER_OPT_SOCKET); 619 error_append_hint(&local_err, GERR_INDEX_HINT, i); 620 goto out; 621 } 622 gsconf->u.q_unix.path = g_strdup(ptr); 623 qemu_opts_del(opts); 624 } 625 626 if (gconf->server == NULL) { 627 gconf->server = g_new0(SocketAddressList, 1); 628 gconf->server->value = gsconf; 629 curr = gconf->server; 630 } else { 631 curr->next = g_new0(SocketAddressList, 1); 632 curr->next->value = gsconf; 633 curr = curr->next; 634 } 635 gsconf = NULL; 636 637 QDECREF(backing_options); 638 backing_options = NULL; 639 g_free(str); 640 str = NULL; 641 } 642 643 return 0; 644 645 out: 646 error_propagate(errp, local_err); 647 qapi_free_SocketAddress(gsconf); 648 qemu_opts_del(opts); 649 g_free(str); 650 QDECREF(backing_options); 651 errno = EINVAL; 652 return -errno; 653 } 654 655 static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf, 656 const char *filename, 657 QDict *options, Error **errp) 658 { 659 int ret; 660 if (filename) { 661 ret = qemu_gluster_parse_uri(gconf, filename); 662 if (ret < 0) { 663 error_setg(errp, "invalid URI"); 664 error_append_hint(errp, "Usage: file=gluster[+transport]://" 665 "[host[:port]]volume/path[?socket=...]" 666 "[,file.debug=N]" 667 "[,file.logfile=/path/filename.log]\n"); 668 errno = -ret; 669 return NULL; 670 } 671 } else { 672 ret = qemu_gluster_parse_json(gconf, options, errp); 673 if (ret < 0) { 674 error_append_hint(errp, "Usage: " 675 "-drive driver=qcow2,file.driver=gluster," 676 "file.volume=testvol,file.path=/path/a.qcow2" 677 "[,file.debug=9]" 678 "[,file.logfile=/path/filename.log]," 679 "file.server.0.type=inet," 680 "file.server.0.host=1.2.3.4," 681 "file.server.0.port=24007," 682 "file.server.1.transport=unix," 683 "file.server.1.socket=/var/run/glusterd.socket ..." 684 "\n"); 685 errno = -ret; 686 return NULL; 687 } 688 689 } 690 691 return qemu_gluster_glfs_init(gconf, errp); 692 } 693 694 /* 695 * AIO callback routine called from GlusterFS thread. 696 */ 697 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg) 698 { 699 GlusterAIOCB *acb = (GlusterAIOCB *)arg; 700 701 if (!ret || ret == acb->size) { 702 acb->ret = 0; /* Success */ 703 } else if (ret < 0) { 704 acb->ret = -errno; /* Read/Write failed */ 705 } else { 706 acb->ret = -EIO; /* Partial read/write - fail it */ 707 } 708 709 aio_co_schedule(acb->aio_context, acb->coroutine); 710 } 711 712 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags) 713 { 714 assert(open_flags != NULL); 715 716 *open_flags |= O_BINARY; 717 718 if (bdrv_flags & BDRV_O_RDWR) { 719 *open_flags |= O_RDWR; 720 } else { 721 *open_flags |= O_RDONLY; 722 } 723 724 if ((bdrv_flags & BDRV_O_NOCACHE)) { 725 *open_flags |= O_DIRECT; 726 } 727 } 728 729 /* 730 * Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of 731 * gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used. 732 * - Corrected versions return -1 and set errno to EINVAL. 733 * - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set 734 * errno to ENXIO when SEEK_DATA is called with a position of EOF. 735 */ 736 static bool qemu_gluster_test_seek(struct glfs_fd *fd) 737 { 738 off_t ret = 0; 739 740 #if defined SEEK_HOLE && defined SEEK_DATA 741 off_t eof; 742 743 eof = glfs_lseek(fd, 0, SEEK_END); 744 if (eof < 0) { 745 /* this should never occur */ 746 return false; 747 } 748 749 /* this should always fail with ENXIO if SEEK_DATA is supported */ 750 ret = glfs_lseek(fd, eof, SEEK_DATA); 751 #endif 752 753 return (ret < 0) && (errno == ENXIO); 754 } 755 756 static int qemu_gluster_open(BlockDriverState *bs, QDict *options, 757 int bdrv_flags, Error **errp) 758 { 759 BDRVGlusterState *s = bs->opaque; 760 int open_flags = 0; 761 int ret = 0; 762 BlockdevOptionsGluster *gconf = NULL; 763 QemuOpts *opts; 764 Error *local_err = NULL; 765 const char *filename, *logfile; 766 767 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 768 qemu_opts_absorb_qdict(opts, options, &local_err); 769 if (local_err) { 770 error_propagate(errp, local_err); 771 ret = -EINVAL; 772 goto out; 773 } 774 775 filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME); 776 777 s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG, 778 GLUSTER_DEBUG_DEFAULT); 779 if (s->debug < 0) { 780 s->debug = 0; 781 } else if (s->debug > GLUSTER_DEBUG_MAX) { 782 s->debug = GLUSTER_DEBUG_MAX; 783 } 784 785 gconf = g_new0(BlockdevOptionsGluster, 1); 786 gconf->debug = s->debug; 787 gconf->has_debug = true; 788 789 logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE); 790 s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT); 791 792 gconf->logfile = g_strdup(s->logfile); 793 gconf->has_logfile = true; 794 795 s->glfs = qemu_gluster_init(gconf, filename, options, errp); 796 if (!s->glfs) { 797 ret = -errno; 798 goto out; 799 } 800 801 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT 802 /* Without this, if fsync fails for a recoverable reason (for instance, 803 * ENOSPC), gluster will dump its cache, preventing retries. This means 804 * almost certain data loss. Not all gluster versions support the 805 * 'resync-failed-syncs-after-fsync' key value, but there is no way to 806 * discover during runtime if it is supported (this api returns success for 807 * unknown key/value pairs) */ 808 ret = glfs_set_xlator_option(s->glfs, "*-write-behind", 809 "resync-failed-syncs-after-fsync", 810 "on"); 811 if (ret < 0) { 812 error_setg_errno(errp, errno, "Unable to set xlator key/value pair"); 813 ret = -errno; 814 goto out; 815 } 816 #endif 817 818 qemu_gluster_parse_flags(bdrv_flags, &open_flags); 819 820 s->fd = glfs_open(s->glfs, gconf->path, open_flags); 821 if (!s->fd) { 822 ret = -errno; 823 } 824 825 s->supports_seek_data = qemu_gluster_test_seek(s->fd); 826 827 out: 828 qemu_opts_del(opts); 829 qapi_free_BlockdevOptionsGluster(gconf); 830 if (!ret) { 831 return ret; 832 } 833 g_free(s->logfile); 834 if (s->fd) { 835 glfs_close(s->fd); 836 } 837 838 glfs_clear_preopened(s->glfs); 839 840 return ret; 841 } 842 843 static int qemu_gluster_reopen_prepare(BDRVReopenState *state, 844 BlockReopenQueue *queue, Error **errp) 845 { 846 int ret = 0; 847 BDRVGlusterState *s; 848 BDRVGlusterReopenState *reop_s; 849 BlockdevOptionsGluster *gconf; 850 int open_flags = 0; 851 852 assert(state != NULL); 853 assert(state->bs != NULL); 854 855 s = state->bs->opaque; 856 857 state->opaque = g_new0(BDRVGlusterReopenState, 1); 858 reop_s = state->opaque; 859 860 qemu_gluster_parse_flags(state->flags, &open_flags); 861 862 gconf = g_new0(BlockdevOptionsGluster, 1); 863 gconf->debug = s->debug; 864 gconf->has_debug = true; 865 gconf->logfile = g_strdup(s->logfile); 866 gconf->has_logfile = true; 867 reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL, errp); 868 if (reop_s->glfs == NULL) { 869 ret = -errno; 870 goto exit; 871 } 872 873 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT 874 ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind", 875 "resync-failed-syncs-after-fsync", "on"); 876 if (ret < 0) { 877 error_setg_errno(errp, errno, "Unable to set xlator key/value pair"); 878 ret = -errno; 879 goto exit; 880 } 881 #endif 882 883 reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags); 884 if (reop_s->fd == NULL) { 885 /* reops->glfs will be cleaned up in _abort */ 886 ret = -errno; 887 goto exit; 888 } 889 890 exit: 891 /* state->opaque will be freed in either the _abort or _commit */ 892 qapi_free_BlockdevOptionsGluster(gconf); 893 return ret; 894 } 895 896 static void qemu_gluster_reopen_commit(BDRVReopenState *state) 897 { 898 BDRVGlusterReopenState *reop_s = state->opaque; 899 BDRVGlusterState *s = state->bs->opaque; 900 901 902 /* close the old */ 903 if (s->fd) { 904 glfs_close(s->fd); 905 } 906 907 glfs_clear_preopened(s->glfs); 908 909 /* use the newly opened image / connection */ 910 s->fd = reop_s->fd; 911 s->glfs = reop_s->glfs; 912 913 g_free(state->opaque); 914 state->opaque = NULL; 915 916 return; 917 } 918 919 920 static void qemu_gluster_reopen_abort(BDRVReopenState *state) 921 { 922 BDRVGlusterReopenState *reop_s = state->opaque; 923 924 if (reop_s == NULL) { 925 return; 926 } 927 928 if (reop_s->fd) { 929 glfs_close(reop_s->fd); 930 } 931 932 glfs_clear_preopened(reop_s->glfs); 933 934 g_free(state->opaque); 935 state->opaque = NULL; 936 937 return; 938 } 939 940 #ifdef CONFIG_GLUSTERFS_ZEROFILL 941 static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs, 942 int64_t offset, 943 int size, 944 BdrvRequestFlags flags) 945 { 946 int ret; 947 GlusterAIOCB acb; 948 BDRVGlusterState *s = bs->opaque; 949 950 acb.size = size; 951 acb.ret = 0; 952 acb.coroutine = qemu_coroutine_self(); 953 acb.aio_context = bdrv_get_aio_context(bs); 954 955 ret = glfs_zerofill_async(s->fd, offset, size, gluster_finish_aiocb, &acb); 956 if (ret < 0) { 957 return -errno; 958 } 959 960 qemu_coroutine_yield(); 961 return acb.ret; 962 } 963 #endif 964 965 static int qemu_gluster_create(const char *filename, 966 QemuOpts *opts, Error **errp) 967 { 968 BlockdevOptionsGluster *gconf; 969 struct glfs *glfs; 970 struct glfs_fd *fd; 971 int ret = 0; 972 PreallocMode prealloc; 973 int64_t total_size = 0; 974 char *tmp = NULL; 975 Error *local_err = NULL; 976 977 gconf = g_new0(BlockdevOptionsGluster, 1); 978 gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG, 979 GLUSTER_DEBUG_DEFAULT); 980 if (gconf->debug < 0) { 981 gconf->debug = 0; 982 } else if (gconf->debug > GLUSTER_DEBUG_MAX) { 983 gconf->debug = GLUSTER_DEBUG_MAX; 984 } 985 gconf->has_debug = true; 986 987 gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE); 988 if (!gconf->logfile) { 989 gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT); 990 } 991 gconf->has_logfile = true; 992 993 glfs = qemu_gluster_init(gconf, filename, NULL, errp); 994 if (!glfs) { 995 ret = -errno; 996 goto out; 997 } 998 999 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1000 BDRV_SECTOR_SIZE); 1001 1002 tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); 1003 prealloc = qapi_enum_parse(&PreallocMode_lookup, tmp, PREALLOC_MODE_OFF, 1004 &local_err); 1005 g_free(tmp); 1006 if (local_err) { 1007 error_propagate(errp, local_err); 1008 ret = -EINVAL; 1009 goto out; 1010 } 1011 1012 fd = glfs_creat(glfs, gconf->path, 1013 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR); 1014 if (!fd) { 1015 ret = -errno; 1016 goto out; 1017 } 1018 1019 switch (prealloc) { 1020 #ifdef CONFIG_GLUSTERFS_FALLOCATE 1021 case PREALLOC_MODE_FALLOC: 1022 if (glfs_fallocate(fd, 0, 0, total_size)) { 1023 error_setg(errp, "Could not preallocate data for the new file"); 1024 ret = -errno; 1025 } 1026 break; 1027 #endif /* CONFIG_GLUSTERFS_FALLOCATE */ 1028 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1029 case PREALLOC_MODE_FULL: 1030 if (!glfs_ftruncate(fd, total_size)) { 1031 if (glfs_zerofill(fd, 0, total_size)) { 1032 error_setg(errp, "Could not zerofill the new file"); 1033 ret = -errno; 1034 } 1035 } else { 1036 error_setg(errp, "Could not resize file"); 1037 ret = -errno; 1038 } 1039 break; 1040 #endif /* CONFIG_GLUSTERFS_ZEROFILL */ 1041 case PREALLOC_MODE_OFF: 1042 if (glfs_ftruncate(fd, total_size) != 0) { 1043 ret = -errno; 1044 error_setg(errp, "Could not resize file"); 1045 } 1046 break; 1047 default: 1048 ret = -EINVAL; 1049 error_setg(errp, "Unsupported preallocation mode: %s", 1050 PreallocMode_str(prealloc)); 1051 break; 1052 } 1053 1054 if (glfs_close(fd) != 0) { 1055 ret = -errno; 1056 } 1057 out: 1058 qapi_free_BlockdevOptionsGluster(gconf); 1059 glfs_clear_preopened(glfs); 1060 return ret; 1061 } 1062 1063 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs, 1064 int64_t sector_num, int nb_sectors, 1065 QEMUIOVector *qiov, int write) 1066 { 1067 int ret; 1068 GlusterAIOCB acb; 1069 BDRVGlusterState *s = bs->opaque; 1070 size_t size = nb_sectors * BDRV_SECTOR_SIZE; 1071 off_t offset = sector_num * BDRV_SECTOR_SIZE; 1072 1073 acb.size = size; 1074 acb.ret = 0; 1075 acb.coroutine = qemu_coroutine_self(); 1076 acb.aio_context = bdrv_get_aio_context(bs); 1077 1078 if (write) { 1079 ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0, 1080 gluster_finish_aiocb, &acb); 1081 } else { 1082 ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0, 1083 gluster_finish_aiocb, &acb); 1084 } 1085 1086 if (ret < 0) { 1087 return -errno; 1088 } 1089 1090 qemu_coroutine_yield(); 1091 return acb.ret; 1092 } 1093 1094 static int qemu_gluster_truncate(BlockDriverState *bs, int64_t offset, 1095 PreallocMode prealloc, Error **errp) 1096 { 1097 int ret; 1098 BDRVGlusterState *s = bs->opaque; 1099 1100 if (prealloc != PREALLOC_MODE_OFF) { 1101 error_setg(errp, "Unsupported preallocation mode '%s'", 1102 PreallocMode_str(prealloc)); 1103 return -ENOTSUP; 1104 } 1105 1106 ret = glfs_ftruncate(s->fd, offset); 1107 if (ret < 0) { 1108 ret = -errno; 1109 error_setg_errno(errp, -ret, "Failed to truncate file"); 1110 return ret; 1111 } 1112 1113 return 0; 1114 } 1115 1116 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs, 1117 int64_t sector_num, 1118 int nb_sectors, 1119 QEMUIOVector *qiov) 1120 { 1121 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0); 1122 } 1123 1124 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs, 1125 int64_t sector_num, 1126 int nb_sectors, 1127 QEMUIOVector *qiov) 1128 { 1129 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1); 1130 } 1131 1132 static void qemu_gluster_close(BlockDriverState *bs) 1133 { 1134 BDRVGlusterState *s = bs->opaque; 1135 1136 g_free(s->logfile); 1137 if (s->fd) { 1138 glfs_close(s->fd); 1139 s->fd = NULL; 1140 } 1141 glfs_clear_preopened(s->glfs); 1142 } 1143 1144 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs) 1145 { 1146 int ret; 1147 GlusterAIOCB acb; 1148 BDRVGlusterState *s = bs->opaque; 1149 1150 acb.size = 0; 1151 acb.ret = 0; 1152 acb.coroutine = qemu_coroutine_self(); 1153 acb.aio_context = bdrv_get_aio_context(bs); 1154 1155 ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb); 1156 if (ret < 0) { 1157 ret = -errno; 1158 goto error; 1159 } 1160 1161 qemu_coroutine_yield(); 1162 if (acb.ret < 0) { 1163 ret = acb.ret; 1164 goto error; 1165 } 1166 1167 return acb.ret; 1168 1169 error: 1170 /* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache 1171 * after a fsync failure, so we have no way of allowing the guest to safely 1172 * continue. Gluster versions prior to 3.5.6 don't retain the cache 1173 * either, but will invalidate the fd on error, so this is again our only 1174 * option. 1175 * 1176 * The 'resync-failed-syncs-after-fsync' xlator option for the 1177 * write-behind cache will cause later gluster versions to retain its 1178 * cache after error, so long as the fd remains open. However, we 1179 * currently have no way of knowing if this option is supported. 1180 * 1181 * TODO: Once gluster provides a way for us to determine if the option 1182 * is supported, bypass the closure and setting drv to NULL. */ 1183 qemu_gluster_close(bs); 1184 bs->drv = NULL; 1185 return ret; 1186 } 1187 1188 #ifdef CONFIG_GLUSTERFS_DISCARD 1189 static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs, 1190 int64_t offset, int size) 1191 { 1192 int ret; 1193 GlusterAIOCB acb; 1194 BDRVGlusterState *s = bs->opaque; 1195 1196 acb.size = 0; 1197 acb.ret = 0; 1198 acb.coroutine = qemu_coroutine_self(); 1199 acb.aio_context = bdrv_get_aio_context(bs); 1200 1201 ret = glfs_discard_async(s->fd, offset, size, gluster_finish_aiocb, &acb); 1202 if (ret < 0) { 1203 return -errno; 1204 } 1205 1206 qemu_coroutine_yield(); 1207 return acb.ret; 1208 } 1209 #endif 1210 1211 static int64_t qemu_gluster_getlength(BlockDriverState *bs) 1212 { 1213 BDRVGlusterState *s = bs->opaque; 1214 int64_t ret; 1215 1216 ret = glfs_lseek(s->fd, 0, SEEK_END); 1217 if (ret < 0) { 1218 return -errno; 1219 } else { 1220 return ret; 1221 } 1222 } 1223 1224 static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs) 1225 { 1226 BDRVGlusterState *s = bs->opaque; 1227 struct stat st; 1228 int ret; 1229 1230 ret = glfs_fstat(s->fd, &st); 1231 if (ret < 0) { 1232 return -errno; 1233 } else { 1234 return st.st_blocks * 512; 1235 } 1236 } 1237 1238 static int qemu_gluster_has_zero_init(BlockDriverState *bs) 1239 { 1240 /* GlusterFS volume could be backed by a block device */ 1241 return 0; 1242 } 1243 1244 /* 1245 * Find allocation range in @bs around offset @start. 1246 * May change underlying file descriptor's file offset. 1247 * If @start is not in a hole, store @start in @data, and the 1248 * beginning of the next hole in @hole, and return 0. 1249 * If @start is in a non-trailing hole, store @start in @hole and the 1250 * beginning of the next non-hole in @data, and return 0. 1251 * If @start is in a trailing hole or beyond EOF, return -ENXIO. 1252 * If we can't find out, return a negative errno other than -ENXIO. 1253 * 1254 * (Shamefully copied from file-posix.c, only miniscule adaptions.) 1255 */ 1256 static int find_allocation(BlockDriverState *bs, off_t start, 1257 off_t *data, off_t *hole) 1258 { 1259 BDRVGlusterState *s = bs->opaque; 1260 1261 if (!s->supports_seek_data) { 1262 goto exit; 1263 } 1264 1265 #if defined SEEK_HOLE && defined SEEK_DATA 1266 off_t offs; 1267 1268 /* 1269 * SEEK_DATA cases: 1270 * D1. offs == start: start is in data 1271 * D2. offs > start: start is in a hole, next data at offs 1272 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole 1273 * or start is beyond EOF 1274 * If the latter happens, the file has been truncated behind 1275 * our back since we opened it. All bets are off then. 1276 * Treating like a trailing hole is simplest. 1277 * D4. offs < 0, errno != ENXIO: we learned nothing 1278 */ 1279 offs = glfs_lseek(s->fd, start, SEEK_DATA); 1280 if (offs < 0) { 1281 return -errno; /* D3 or D4 */ 1282 } 1283 1284 if (offs < start) { 1285 /* This is not a valid return by lseek(). We are safe to just return 1286 * -EIO in this case, and we'll treat it like D4. Unfortunately some 1287 * versions of gluster server will return offs < start, so an assert 1288 * here will unnecessarily abort QEMU. */ 1289 return -EIO; 1290 } 1291 1292 if (offs > start) { 1293 /* D2: in hole, next data at offs */ 1294 *hole = start; 1295 *data = offs; 1296 return 0; 1297 } 1298 1299 /* D1: in data, end not yet known */ 1300 1301 /* 1302 * SEEK_HOLE cases: 1303 * H1. offs == start: start is in a hole 1304 * If this happens here, a hole has been dug behind our back 1305 * since the previous lseek(). 1306 * H2. offs > start: either start is in data, next hole at offs, 1307 * or start is in trailing hole, EOF at offs 1308 * Linux treats trailing holes like any other hole: offs == 1309 * start. Solaris seeks to EOF instead: offs > start (blech). 1310 * If that happens here, a hole has been dug behind our back 1311 * since the previous lseek(). 1312 * H3. offs < 0, errno = ENXIO: start is beyond EOF 1313 * If this happens, the file has been truncated behind our 1314 * back since we opened it. Treat it like a trailing hole. 1315 * H4. offs < 0, errno != ENXIO: we learned nothing 1316 * Pretend we know nothing at all, i.e. "forget" about D1. 1317 */ 1318 offs = glfs_lseek(s->fd, start, SEEK_HOLE); 1319 if (offs < 0) { 1320 return -errno; /* D1 and (H3 or H4) */ 1321 } 1322 1323 if (offs < start) { 1324 /* This is not a valid return by lseek(). We are safe to just return 1325 * -EIO in this case, and we'll treat it like H4. Unfortunately some 1326 * versions of gluster server will return offs < start, so an assert 1327 * here will unnecessarily abort QEMU. */ 1328 return -EIO; 1329 } 1330 1331 if (offs > start) { 1332 /* 1333 * D1 and H2: either in data, next hole at offs, or it was in 1334 * data but is now in a trailing hole. In the latter case, 1335 * all bets are off. Treating it as if it there was data all 1336 * the way to EOF is safe, so simply do that. 1337 */ 1338 *data = start; 1339 *hole = offs; 1340 return 0; 1341 } 1342 1343 /* D1 and H1 */ 1344 return -EBUSY; 1345 #endif 1346 1347 exit: 1348 return -ENOTSUP; 1349 } 1350 1351 /* 1352 * Returns the allocation status of the specified sectors. 1353 * 1354 * If 'sector_num' is beyond the end of the disk image the return value is 0 1355 * and 'pnum' is set to 0. 1356 * 1357 * 'pnum' is set to the number of sectors (including and immediately following 1358 * the specified sector) that are known to be in the same 1359 * allocated/unallocated state. 1360 * 1361 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes 1362 * beyond the end of the disk image it will be clamped. 1363 * 1364 * (Based on raw_co_get_block_status() from file-posix.c.) 1365 */ 1366 static int64_t coroutine_fn qemu_gluster_co_get_block_status( 1367 BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum, 1368 BlockDriverState **file) 1369 { 1370 BDRVGlusterState *s = bs->opaque; 1371 off_t start, data = 0, hole = 0; 1372 int64_t total_size; 1373 int ret = -EINVAL; 1374 1375 if (!s->fd) { 1376 return ret; 1377 } 1378 1379 start = sector_num * BDRV_SECTOR_SIZE; 1380 total_size = bdrv_getlength(bs); 1381 if (total_size < 0) { 1382 return total_size; 1383 } else if (start >= total_size) { 1384 *pnum = 0; 1385 return 0; 1386 } else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) { 1387 nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE); 1388 } 1389 1390 ret = find_allocation(bs, start, &data, &hole); 1391 if (ret == -ENXIO) { 1392 /* Trailing hole */ 1393 *pnum = nb_sectors; 1394 ret = BDRV_BLOCK_ZERO; 1395 } else if (ret < 0) { 1396 /* No info available, so pretend there are no holes */ 1397 *pnum = nb_sectors; 1398 ret = BDRV_BLOCK_DATA; 1399 } else if (data == start) { 1400 /* On a data extent, compute sectors to the end of the extent, 1401 * possibly including a partial sector at EOF. */ 1402 *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE)); 1403 ret = BDRV_BLOCK_DATA; 1404 } else { 1405 /* On a hole, compute sectors to the beginning of the next extent. */ 1406 assert(hole == start); 1407 *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE); 1408 ret = BDRV_BLOCK_ZERO; 1409 } 1410 1411 *file = bs; 1412 1413 return ret | BDRV_BLOCK_OFFSET_VALID | start; 1414 } 1415 1416 1417 static BlockDriver bdrv_gluster = { 1418 .format_name = "gluster", 1419 .protocol_name = "gluster", 1420 .instance_size = sizeof(BDRVGlusterState), 1421 .bdrv_needs_filename = false, 1422 .bdrv_file_open = qemu_gluster_open, 1423 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1424 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1425 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1426 .bdrv_close = qemu_gluster_close, 1427 .bdrv_create = qemu_gluster_create, 1428 .bdrv_getlength = qemu_gluster_getlength, 1429 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1430 .bdrv_truncate = qemu_gluster_truncate, 1431 .bdrv_co_readv = qemu_gluster_co_readv, 1432 .bdrv_co_writev = qemu_gluster_co_writev, 1433 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1434 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1435 #ifdef CONFIG_GLUSTERFS_DISCARD 1436 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1437 #endif 1438 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1439 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1440 #endif 1441 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status, 1442 .create_opts = &qemu_gluster_create_opts, 1443 }; 1444 1445 static BlockDriver bdrv_gluster_tcp = { 1446 .format_name = "gluster", 1447 .protocol_name = "gluster+tcp", 1448 .instance_size = sizeof(BDRVGlusterState), 1449 .bdrv_needs_filename = false, 1450 .bdrv_file_open = qemu_gluster_open, 1451 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1452 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1453 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1454 .bdrv_close = qemu_gluster_close, 1455 .bdrv_create = qemu_gluster_create, 1456 .bdrv_getlength = qemu_gluster_getlength, 1457 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1458 .bdrv_truncate = qemu_gluster_truncate, 1459 .bdrv_co_readv = qemu_gluster_co_readv, 1460 .bdrv_co_writev = qemu_gluster_co_writev, 1461 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1462 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1463 #ifdef CONFIG_GLUSTERFS_DISCARD 1464 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1465 #endif 1466 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1467 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1468 #endif 1469 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status, 1470 .create_opts = &qemu_gluster_create_opts, 1471 }; 1472 1473 static BlockDriver bdrv_gluster_unix = { 1474 .format_name = "gluster", 1475 .protocol_name = "gluster+unix", 1476 .instance_size = sizeof(BDRVGlusterState), 1477 .bdrv_needs_filename = true, 1478 .bdrv_file_open = qemu_gluster_open, 1479 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1480 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1481 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1482 .bdrv_close = qemu_gluster_close, 1483 .bdrv_create = qemu_gluster_create, 1484 .bdrv_getlength = qemu_gluster_getlength, 1485 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1486 .bdrv_truncate = qemu_gluster_truncate, 1487 .bdrv_co_readv = qemu_gluster_co_readv, 1488 .bdrv_co_writev = qemu_gluster_co_writev, 1489 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1490 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1491 #ifdef CONFIG_GLUSTERFS_DISCARD 1492 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1493 #endif 1494 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1495 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1496 #endif 1497 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status, 1498 .create_opts = &qemu_gluster_create_opts, 1499 }; 1500 1501 /* rdma is deprecated (actually never supported for volfile fetch). 1502 * Let's maintain it for the protocol compatibility, to make sure things 1503 * won't break immediately. For now, gluster+rdma will fall back to gluster+tcp 1504 * protocol with a warning. 1505 * TODO: remove gluster+rdma interface support 1506 */ 1507 static BlockDriver bdrv_gluster_rdma = { 1508 .format_name = "gluster", 1509 .protocol_name = "gluster+rdma", 1510 .instance_size = sizeof(BDRVGlusterState), 1511 .bdrv_needs_filename = true, 1512 .bdrv_file_open = qemu_gluster_open, 1513 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1514 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1515 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1516 .bdrv_close = qemu_gluster_close, 1517 .bdrv_create = qemu_gluster_create, 1518 .bdrv_getlength = qemu_gluster_getlength, 1519 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1520 .bdrv_truncate = qemu_gluster_truncate, 1521 .bdrv_co_readv = qemu_gluster_co_readv, 1522 .bdrv_co_writev = qemu_gluster_co_writev, 1523 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1524 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1525 #ifdef CONFIG_GLUSTERFS_DISCARD 1526 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1527 #endif 1528 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1529 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1530 #endif 1531 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status, 1532 .create_opts = &qemu_gluster_create_opts, 1533 }; 1534 1535 static void bdrv_gluster_init(void) 1536 { 1537 bdrv_register(&bdrv_gluster_rdma); 1538 bdrv_register(&bdrv_gluster_unix); 1539 bdrv_register(&bdrv_gluster_tcp); 1540 bdrv_register(&bdrv_gluster); 1541 } 1542 1543 block_init(bdrv_gluster_init); 1544