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 11 #include "qemu/osdep.h" 12 #include <glusterfs/api/glfs.h> 13 #include "block/block_int.h" 14 #include "block/qdict.h" 15 #include "qapi/error.h" 16 #include "qapi/qmp/qdict.h" 17 #include "qapi/qmp/qerror.h" 18 #include "qemu/uri.h" 19 #include "qemu/error-report.h" 20 #include "qemu/option.h" 21 #include "qemu/cutils.h" 22 23 #ifdef CONFIG_GLUSTERFS_FTRUNCATE_HAS_STAT 24 # define glfs_ftruncate(fd, offset) glfs_ftruncate(fd, offset, NULL, NULL) 25 #endif 26 27 #define GLUSTER_OPT_FILENAME "filename" 28 #define GLUSTER_OPT_VOLUME "volume" 29 #define GLUSTER_OPT_PATH "path" 30 #define GLUSTER_OPT_TYPE "type" 31 #define GLUSTER_OPT_SERVER_PATTERN "server." 32 #define GLUSTER_OPT_HOST "host" 33 #define GLUSTER_OPT_PORT "port" 34 #define GLUSTER_OPT_TO "to" 35 #define GLUSTER_OPT_IPV4 "ipv4" 36 #define GLUSTER_OPT_IPV6 "ipv6" 37 #define GLUSTER_OPT_SOCKET "socket" 38 #define GLUSTER_OPT_DEBUG "debug" 39 #define GLUSTER_DEFAULT_PORT 24007 40 #define GLUSTER_DEBUG_DEFAULT 4 41 #define GLUSTER_DEBUG_MAX 9 42 #define GLUSTER_OPT_LOGFILE "logfile" 43 #define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */ 44 45 #define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n" 46 47 typedef struct GlusterAIOCB { 48 int64_t size; 49 int ret; 50 Coroutine *coroutine; 51 AioContext *aio_context; 52 } GlusterAIOCB; 53 54 typedef struct BDRVGlusterState { 55 struct glfs *glfs; 56 struct glfs_fd *fd; 57 char *logfile; 58 bool supports_seek_data; 59 int debug; 60 } BDRVGlusterState; 61 62 typedef struct BDRVGlusterReopenState { 63 struct glfs *glfs; 64 struct glfs_fd *fd; 65 } BDRVGlusterReopenState; 66 67 68 typedef struct GlfsPreopened { 69 char *volume; 70 glfs_t *fs; 71 int ref; 72 } GlfsPreopened; 73 74 typedef struct ListElement { 75 QLIST_ENTRY(ListElement) list; 76 GlfsPreopened saved; 77 } ListElement; 78 79 static QLIST_HEAD(, ListElement) glfs_list; 80 81 static QemuOptsList qemu_gluster_create_opts = { 82 .name = "qemu-gluster-create-opts", 83 .head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head), 84 .desc = { 85 { 86 .name = BLOCK_OPT_SIZE, 87 .type = QEMU_OPT_SIZE, 88 .help = "Virtual disk size" 89 }, 90 { 91 .name = BLOCK_OPT_PREALLOC, 92 .type = QEMU_OPT_STRING, 93 .help = "Preallocation mode (allowed values: off, full)" 94 }, 95 { 96 .name = GLUSTER_OPT_DEBUG, 97 .type = QEMU_OPT_NUMBER, 98 .help = "Gluster log level, valid range is 0-9", 99 }, 100 { 101 .name = GLUSTER_OPT_LOGFILE, 102 .type = QEMU_OPT_STRING, 103 .help = "Logfile path of libgfapi", 104 }, 105 { /* end of list */ } 106 } 107 }; 108 109 static QemuOptsList runtime_opts = { 110 .name = "gluster", 111 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 112 .desc = { 113 { 114 .name = GLUSTER_OPT_FILENAME, 115 .type = QEMU_OPT_STRING, 116 .help = "URL to the gluster image", 117 }, 118 { 119 .name = GLUSTER_OPT_DEBUG, 120 .type = QEMU_OPT_NUMBER, 121 .help = "Gluster log level, valid range is 0-9", 122 }, 123 { 124 .name = GLUSTER_OPT_LOGFILE, 125 .type = QEMU_OPT_STRING, 126 .help = "Logfile path of libgfapi", 127 }, 128 { /* end of list */ } 129 }, 130 }; 131 132 static QemuOptsList runtime_json_opts = { 133 .name = "gluster_json", 134 .head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head), 135 .desc = { 136 { 137 .name = GLUSTER_OPT_VOLUME, 138 .type = QEMU_OPT_STRING, 139 .help = "name of gluster volume where VM image resides", 140 }, 141 { 142 .name = GLUSTER_OPT_PATH, 143 .type = QEMU_OPT_STRING, 144 .help = "absolute path to image file in gluster volume", 145 }, 146 { 147 .name = GLUSTER_OPT_DEBUG, 148 .type = QEMU_OPT_NUMBER, 149 .help = "Gluster log level, valid range is 0-9", 150 }, 151 { /* end of list */ } 152 }, 153 }; 154 155 static QemuOptsList runtime_type_opts = { 156 .name = "gluster_type", 157 .head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head), 158 .desc = { 159 { 160 .name = GLUSTER_OPT_TYPE, 161 .type = QEMU_OPT_STRING, 162 .help = "inet|unix", 163 }, 164 { /* end of list */ } 165 }, 166 }; 167 168 static QemuOptsList runtime_unix_opts = { 169 .name = "gluster_unix", 170 .head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head), 171 .desc = { 172 { 173 .name = GLUSTER_OPT_SOCKET, 174 .type = QEMU_OPT_STRING, 175 .help = "socket file path (legacy)", 176 }, 177 { 178 .name = GLUSTER_OPT_PATH, 179 .type = QEMU_OPT_STRING, 180 .help = "socket file path (QAPI)", 181 }, 182 { /* end of list */ } 183 }, 184 }; 185 186 static QemuOptsList runtime_inet_opts = { 187 .name = "gluster_inet", 188 .head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head), 189 .desc = { 190 { 191 .name = GLUSTER_OPT_TYPE, 192 .type = QEMU_OPT_STRING, 193 .help = "inet|unix", 194 }, 195 { 196 .name = GLUSTER_OPT_HOST, 197 .type = QEMU_OPT_STRING, 198 .help = "host address (hostname/ipv4/ipv6 addresses)", 199 }, 200 { 201 .name = GLUSTER_OPT_PORT, 202 .type = QEMU_OPT_STRING, 203 .help = "port number on which glusterd is listening (default 24007)", 204 }, 205 { 206 .name = "to", 207 .type = QEMU_OPT_NUMBER, 208 .help = "max port number, not supported by gluster", 209 }, 210 { 211 .name = "ipv4", 212 .type = QEMU_OPT_BOOL, 213 .help = "ipv4 bool value, not supported by gluster", 214 }, 215 { 216 .name = "ipv6", 217 .type = QEMU_OPT_BOOL, 218 .help = "ipv6 bool value, not supported by gluster", 219 }, 220 { /* end of list */ } 221 }, 222 }; 223 224 static void glfs_set_preopened(const char *volume, glfs_t *fs) 225 { 226 ListElement *entry = NULL; 227 228 entry = g_new(ListElement, 1); 229 230 entry->saved.volume = g_strdup(volume); 231 232 entry->saved.fs = fs; 233 entry->saved.ref = 1; 234 235 QLIST_INSERT_HEAD(&glfs_list, entry, list); 236 } 237 238 static glfs_t *glfs_find_preopened(const char *volume) 239 { 240 ListElement *entry = NULL; 241 242 QLIST_FOREACH(entry, &glfs_list, list) { 243 if (strcmp(entry->saved.volume, volume) == 0) { 244 entry->saved.ref++; 245 return entry->saved.fs; 246 } 247 } 248 249 return NULL; 250 } 251 252 static void glfs_clear_preopened(glfs_t *fs) 253 { 254 ListElement *entry = NULL; 255 ListElement *next; 256 257 if (fs == NULL) { 258 return; 259 } 260 261 QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) { 262 if (entry->saved.fs == fs) { 263 if (--entry->saved.ref) { 264 return; 265 } 266 267 QLIST_REMOVE(entry, list); 268 269 glfs_fini(entry->saved.fs); 270 g_free(entry->saved.volume); 271 g_free(entry); 272 } 273 } 274 } 275 276 static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path) 277 { 278 char *p, *q; 279 280 if (!path) { 281 return -EINVAL; 282 } 283 284 /* volume */ 285 p = q = path + strspn(path, "/"); 286 p += strcspn(p, "/"); 287 if (*p == '\0') { 288 return -EINVAL; 289 } 290 gconf->volume = g_strndup(q, p - q); 291 292 /* path */ 293 p += strspn(p, "/"); 294 if (*p == '\0') { 295 return -EINVAL; 296 } 297 gconf->path = g_strdup(p); 298 return 0; 299 } 300 301 /* 302 * file=gluster[+transport]://[host[:port]]/volume/path[?socket=...] 303 * 304 * 'gluster' is the protocol. 305 * 306 * 'transport' specifies the transport type used to connect to gluster 307 * management daemon (glusterd). Valid transport types are 308 * tcp or unix. If a transport type isn't specified, then tcp type is assumed. 309 * 310 * 'host' specifies the host where the volume file specification for 311 * the given volume resides. This can be either hostname or ipv4 address. 312 * If transport type is 'unix', then 'host' field should not be specified. 313 * The 'socket' field needs to be populated with the path to unix domain 314 * socket. 315 * 316 * 'port' is the port number on which glusterd is listening. This is optional 317 * and if not specified, QEMU will send 0 which will make gluster to use the 318 * default port. If the transport type is unix, then 'port' should not be 319 * specified. 320 * 321 * 'volume' is the name of the gluster volume which contains the VM image. 322 * 323 * 'path' is the path to the actual VM image that resides on gluster volume. 324 * 325 * Examples: 326 * 327 * file=gluster://1.2.3.4/testvol/a.img 328 * file=gluster+tcp://1.2.3.4/testvol/a.img 329 * file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img 330 * file=gluster+tcp://host.domain.com:24007/testvol/dir/a.img 331 * file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket 332 */ 333 static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf, 334 const char *filename) 335 { 336 SocketAddress *gsconf; 337 URI *uri; 338 QueryParams *qp = NULL; 339 bool is_unix = false; 340 int ret = 0; 341 342 uri = uri_parse(filename); 343 if (!uri) { 344 return -EINVAL; 345 } 346 347 gconf->server = g_new0(SocketAddressList, 1); 348 gconf->server->value = gsconf = g_new0(SocketAddress, 1); 349 350 /* transport */ 351 if (!uri->scheme || !strcmp(uri->scheme, "gluster")) { 352 gsconf->type = SOCKET_ADDRESS_TYPE_INET; 353 } else if (!strcmp(uri->scheme, "gluster+tcp")) { 354 gsconf->type = SOCKET_ADDRESS_TYPE_INET; 355 } else if (!strcmp(uri->scheme, "gluster+unix")) { 356 gsconf->type = SOCKET_ADDRESS_TYPE_UNIX; 357 is_unix = true; 358 } else if (!strcmp(uri->scheme, "gluster+rdma")) { 359 gsconf->type = SOCKET_ADDRESS_TYPE_INET; 360 warn_report("rdma feature is not supported, falling back to tcp"); 361 } else { 362 ret = -EINVAL; 363 goto out; 364 } 365 366 ret = parse_volume_options(gconf, uri->path); 367 if (ret < 0) { 368 goto out; 369 } 370 371 qp = query_params_parse(uri->query); 372 if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { 373 ret = -EINVAL; 374 goto out; 375 } 376 377 if (is_unix) { 378 if (uri->server || uri->port) { 379 ret = -EINVAL; 380 goto out; 381 } 382 if (strcmp(qp->p[0].name, "socket")) { 383 ret = -EINVAL; 384 goto out; 385 } 386 gsconf->u.q_unix.path = g_strdup(qp->p[0].value); 387 } else { 388 gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost"); 389 if (uri->port) { 390 gsconf->u.inet.port = g_strdup_printf("%d", uri->port); 391 } else { 392 gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT); 393 } 394 } 395 396 out: 397 if (qp) { 398 query_params_free(qp); 399 } 400 uri_free(uri); 401 return ret; 402 } 403 404 static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf, 405 Error **errp) 406 { 407 struct glfs *glfs; 408 int ret; 409 int old_errno; 410 SocketAddressList *server; 411 unsigned long long port; 412 413 glfs = glfs_find_preopened(gconf->volume); 414 if (glfs) { 415 return glfs; 416 } 417 418 glfs = glfs_new(gconf->volume); 419 if (!glfs) { 420 goto out; 421 } 422 423 glfs_set_preopened(gconf->volume, glfs); 424 425 for (server = gconf->server; server; server = server->next) { 426 switch (server->value->type) { 427 case SOCKET_ADDRESS_TYPE_UNIX: 428 ret = glfs_set_volfile_server(glfs, "unix", 429 server->value->u.q_unix.path, 0); 430 break; 431 case SOCKET_ADDRESS_TYPE_INET: 432 if (parse_uint_full(server->value->u.inet.port, &port, 10) < 0 || 433 port > 65535) { 434 error_setg(errp, "'%s' is not a valid port number", 435 server->value->u.inet.port); 436 errno = EINVAL; 437 goto out; 438 } 439 ret = glfs_set_volfile_server(glfs, "tcp", 440 server->value->u.inet.host, 441 (int)port); 442 break; 443 case SOCKET_ADDRESS_TYPE_VSOCK: 444 case SOCKET_ADDRESS_TYPE_FD: 445 default: 446 abort(); 447 } 448 449 if (ret < 0) { 450 goto out; 451 } 452 } 453 454 ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug); 455 if (ret < 0) { 456 goto out; 457 } 458 459 ret = glfs_init(glfs); 460 if (ret) { 461 error_setg(errp, "Gluster connection for volume %s, path %s failed" 462 " to connect", gconf->volume, gconf->path); 463 for (server = gconf->server; server; server = server->next) { 464 if (server->value->type == SOCKET_ADDRESS_TYPE_UNIX) { 465 error_append_hint(errp, "hint: failed on socket %s ", 466 server->value->u.q_unix.path); 467 } else { 468 error_append_hint(errp, "hint: failed on host %s and port %s ", 469 server->value->u.inet.host, 470 server->value->u.inet.port); 471 } 472 } 473 474 error_append_hint(errp, "Please refer to gluster logs for more info\n"); 475 476 /* glfs_init sometimes doesn't set errno although docs suggest that */ 477 if (errno == 0) { 478 errno = EINVAL; 479 } 480 481 goto out; 482 } 483 return glfs; 484 485 out: 486 if (glfs) { 487 old_errno = errno; 488 glfs_clear_preopened(glfs); 489 errno = old_errno; 490 } 491 return NULL; 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 SocketAddress *gsconf = NULL; 502 SocketAddressList *curr = NULL; 503 QDict *backing_options = NULL; 504 Error *local_err = NULL; 505 char *str = NULL; 506 const char *ptr; 507 int i, type, num_servers; 508 509 /* create opts info from runtime_json_opts list */ 510 opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort); 511 qemu_opts_absorb_qdict(opts, options, &local_err); 512 if (local_err) { 513 goto out; 514 } 515 516 num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN); 517 if (num_servers < 1) { 518 error_setg(&local_err, QERR_MISSING_PARAMETER, "server"); 519 goto out; 520 } 521 522 ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME); 523 if (!ptr) { 524 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME); 525 goto out; 526 } 527 gconf->volume = g_strdup(ptr); 528 529 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH); 530 if (!ptr) { 531 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH); 532 goto out; 533 } 534 gconf->path = g_strdup(ptr); 535 qemu_opts_del(opts); 536 537 for (i = 0; i < num_servers; i++) { 538 str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i); 539 qdict_extract_subqdict(options, &backing_options, str); 540 541 /* create opts info from runtime_type_opts list */ 542 opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort); 543 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 544 if (local_err) { 545 goto out; 546 } 547 548 ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE); 549 if (!ptr) { 550 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE); 551 error_append_hint(&local_err, GERR_INDEX_HINT, i); 552 goto out; 553 554 } 555 gsconf = g_new0(SocketAddress, 1); 556 if (!strcmp(ptr, "tcp")) { 557 ptr = "inet"; /* accept legacy "tcp" */ 558 } 559 type = qapi_enum_parse(&SocketAddressType_lookup, ptr, -1, NULL); 560 if (type != SOCKET_ADDRESS_TYPE_INET 561 && type != SOCKET_ADDRESS_TYPE_UNIX) { 562 error_setg(&local_err, 563 "Parameter '%s' may be 'inet' or 'unix'", 564 GLUSTER_OPT_TYPE); 565 error_append_hint(&local_err, GERR_INDEX_HINT, i); 566 goto out; 567 } 568 gsconf->type = type; 569 qemu_opts_del(opts); 570 571 if (gsconf->type == SOCKET_ADDRESS_TYPE_INET) { 572 /* create opts info from runtime_inet_opts list */ 573 opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort); 574 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 575 if (local_err) { 576 goto out; 577 } 578 579 ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST); 580 if (!ptr) { 581 error_setg(&local_err, QERR_MISSING_PARAMETER, 582 GLUSTER_OPT_HOST); 583 error_append_hint(&local_err, GERR_INDEX_HINT, i); 584 goto out; 585 } 586 gsconf->u.inet.host = g_strdup(ptr); 587 ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT); 588 if (!ptr) { 589 error_setg(&local_err, QERR_MISSING_PARAMETER, 590 GLUSTER_OPT_PORT); 591 error_append_hint(&local_err, GERR_INDEX_HINT, i); 592 goto out; 593 } 594 gsconf->u.inet.port = g_strdup(ptr); 595 596 /* defend for unsupported fields in InetSocketAddress, 597 * i.e. @ipv4, @ipv6 and @to 598 */ 599 ptr = qemu_opt_get(opts, GLUSTER_OPT_TO); 600 if (ptr) { 601 gsconf->u.inet.has_to = true; 602 } 603 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4); 604 if (ptr) { 605 gsconf->u.inet.has_ipv4 = true; 606 } 607 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6); 608 if (ptr) { 609 gsconf->u.inet.has_ipv6 = true; 610 } 611 if (gsconf->u.inet.has_to) { 612 error_setg(&local_err, "Parameter 'to' not supported"); 613 goto out; 614 } 615 if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) { 616 error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported"); 617 goto out; 618 } 619 qemu_opts_del(opts); 620 } else { 621 /* create opts info from runtime_unix_opts list */ 622 opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort); 623 qemu_opts_absorb_qdict(opts, backing_options, &local_err); 624 if (local_err) { 625 goto out; 626 } 627 628 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH); 629 if (!ptr) { 630 ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET); 631 } else if (qemu_opt_get(opts, GLUSTER_OPT_SOCKET)) { 632 error_setg(&local_err, 633 "Conflicting parameters 'path' and 'socket'"); 634 error_append_hint(&local_err, GERR_INDEX_HINT, i); 635 goto out; 636 } 637 if (!ptr) { 638 error_setg(&local_err, QERR_MISSING_PARAMETER, 639 GLUSTER_OPT_PATH); 640 error_append_hint(&local_err, GERR_INDEX_HINT, i); 641 goto out; 642 } 643 gsconf->u.q_unix.path = g_strdup(ptr); 644 qemu_opts_del(opts); 645 } 646 647 if (gconf->server == NULL) { 648 gconf->server = g_new0(SocketAddressList, 1); 649 gconf->server->value = gsconf; 650 curr = gconf->server; 651 } else { 652 curr->next = g_new0(SocketAddressList, 1); 653 curr->next->value = gsconf; 654 curr = curr->next; 655 } 656 gsconf = NULL; 657 658 qobject_unref(backing_options); 659 backing_options = NULL; 660 g_free(str); 661 str = NULL; 662 } 663 664 return 0; 665 666 out: 667 error_propagate(errp, local_err); 668 qapi_free_SocketAddress(gsconf); 669 qemu_opts_del(opts); 670 g_free(str); 671 qobject_unref(backing_options); 672 errno = EINVAL; 673 return -errno; 674 } 675 676 /* Converts options given in @filename and the @options QDict into the QAPI 677 * object @gconf. */ 678 static int qemu_gluster_parse(BlockdevOptionsGluster *gconf, 679 const char *filename, 680 QDict *options, Error **errp) 681 { 682 int ret; 683 if (filename) { 684 ret = qemu_gluster_parse_uri(gconf, filename); 685 if (ret < 0) { 686 error_setg(errp, "invalid URI %s", filename); 687 error_append_hint(errp, "Usage: file=gluster[+transport]://" 688 "[host[:port]]volume/path[?socket=...]" 689 "[,file.debug=N]" 690 "[,file.logfile=/path/filename.log]\n"); 691 return ret; 692 } 693 } else { 694 ret = qemu_gluster_parse_json(gconf, options, errp); 695 if (ret < 0) { 696 error_append_hint(errp, "Usage: " 697 "-drive driver=qcow2,file.driver=gluster," 698 "file.volume=testvol,file.path=/path/a.qcow2" 699 "[,file.debug=9]" 700 "[,file.logfile=/path/filename.log]," 701 "file.server.0.type=inet," 702 "file.server.0.host=1.2.3.4," 703 "file.server.0.port=24007," 704 "file.server.1.transport=unix," 705 "file.server.1.path=/var/run/glusterd.socket ..." 706 "\n"); 707 return ret; 708 } 709 } 710 711 return 0; 712 } 713 714 static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf, 715 const char *filename, 716 QDict *options, Error **errp) 717 { 718 int ret; 719 720 ret = qemu_gluster_parse(gconf, filename, options, errp); 721 if (ret < 0) { 722 errno = -ret; 723 return NULL; 724 } 725 726 return qemu_gluster_glfs_init(gconf, errp); 727 } 728 729 /* 730 * AIO callback routine called from GlusterFS thread. 731 */ 732 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, 733 #ifdef CONFIG_GLUSTERFS_IOCB_HAS_STAT 734 struct glfs_stat *pre, struct glfs_stat *post, 735 #endif 736 void *arg) 737 { 738 GlusterAIOCB *acb = (GlusterAIOCB *)arg; 739 740 if (!ret || ret == acb->size) { 741 acb->ret = 0; /* Success */ 742 } else if (ret < 0) { 743 acb->ret = -errno; /* Read/Write failed */ 744 } else { 745 acb->ret = -EIO; /* Partial read/write - fail it */ 746 } 747 748 aio_co_schedule(acb->aio_context, acb->coroutine); 749 } 750 751 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags) 752 { 753 assert(open_flags != NULL); 754 755 *open_flags |= O_BINARY; 756 757 if (bdrv_flags & BDRV_O_RDWR) { 758 *open_flags |= O_RDWR; 759 } else { 760 *open_flags |= O_RDONLY; 761 } 762 763 if ((bdrv_flags & BDRV_O_NOCACHE)) { 764 *open_flags |= O_DIRECT; 765 } 766 } 767 768 /* 769 * Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of 770 * gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used. 771 * - Corrected versions return -1 and set errno to EINVAL. 772 * - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set 773 * errno to ENXIO when SEEK_DATA is called with a position of EOF. 774 */ 775 static bool qemu_gluster_test_seek(struct glfs_fd *fd) 776 { 777 off_t ret = 0; 778 779 #if defined SEEK_HOLE && defined SEEK_DATA 780 off_t eof; 781 782 eof = glfs_lseek(fd, 0, SEEK_END); 783 if (eof < 0) { 784 /* this should never occur */ 785 return false; 786 } 787 788 /* this should always fail with ENXIO if SEEK_DATA is supported */ 789 ret = glfs_lseek(fd, eof, SEEK_DATA); 790 #endif 791 792 return (ret < 0) && (errno == ENXIO); 793 } 794 795 static int qemu_gluster_open(BlockDriverState *bs, QDict *options, 796 int bdrv_flags, Error **errp) 797 { 798 BDRVGlusterState *s = bs->opaque; 799 int open_flags = 0; 800 int ret = 0; 801 BlockdevOptionsGluster *gconf = NULL; 802 QemuOpts *opts; 803 Error *local_err = NULL; 804 const char *filename, *logfile; 805 806 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 807 qemu_opts_absorb_qdict(opts, options, &local_err); 808 if (local_err) { 809 error_propagate(errp, local_err); 810 ret = -EINVAL; 811 goto out; 812 } 813 814 filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME); 815 816 s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG, 817 GLUSTER_DEBUG_DEFAULT); 818 if (s->debug < 0) { 819 s->debug = 0; 820 } else if (s->debug > GLUSTER_DEBUG_MAX) { 821 s->debug = GLUSTER_DEBUG_MAX; 822 } 823 824 gconf = g_new0(BlockdevOptionsGluster, 1); 825 gconf->debug = s->debug; 826 gconf->has_debug = true; 827 828 logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE); 829 s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT); 830 831 gconf->logfile = g_strdup(s->logfile); 832 gconf->has_logfile = true; 833 834 s->glfs = qemu_gluster_init(gconf, filename, options, errp); 835 if (!s->glfs) { 836 ret = -errno; 837 goto out; 838 } 839 840 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT 841 /* Without this, if fsync fails for a recoverable reason (for instance, 842 * ENOSPC), gluster will dump its cache, preventing retries. This means 843 * almost certain data loss. Not all gluster versions support the 844 * 'resync-failed-syncs-after-fsync' key value, but there is no way to 845 * discover during runtime if it is supported (this api returns success for 846 * unknown key/value pairs) */ 847 ret = glfs_set_xlator_option(s->glfs, "*-write-behind", 848 "resync-failed-syncs-after-fsync", 849 "on"); 850 if (ret < 0) { 851 error_setg_errno(errp, errno, "Unable to set xlator key/value pair"); 852 ret = -errno; 853 goto out; 854 } 855 #endif 856 857 qemu_gluster_parse_flags(bdrv_flags, &open_flags); 858 859 s->fd = glfs_open(s->glfs, gconf->path, open_flags); 860 ret = s->fd ? 0 : -errno; 861 862 if (ret == -EACCES || ret == -EROFS) { 863 /* Try to degrade to read-only, but if it doesn't work, still use the 864 * normal error message. */ 865 if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) { 866 open_flags = (open_flags & ~O_RDWR) | O_RDONLY; 867 s->fd = glfs_open(s->glfs, gconf->path, open_flags); 868 ret = s->fd ? 0 : -errno; 869 } 870 } 871 872 s->supports_seek_data = qemu_gluster_test_seek(s->fd); 873 874 out: 875 qemu_opts_del(opts); 876 qapi_free_BlockdevOptionsGluster(gconf); 877 if (!ret) { 878 return ret; 879 } 880 g_free(s->logfile); 881 if (s->fd) { 882 glfs_close(s->fd); 883 } 884 885 glfs_clear_preopened(s->glfs); 886 887 return ret; 888 } 889 890 static int qemu_gluster_reopen_prepare(BDRVReopenState *state, 891 BlockReopenQueue *queue, Error **errp) 892 { 893 int ret = 0; 894 BDRVGlusterState *s; 895 BDRVGlusterReopenState *reop_s; 896 BlockdevOptionsGluster *gconf; 897 int open_flags = 0; 898 899 assert(state != NULL); 900 assert(state->bs != NULL); 901 902 s = state->bs->opaque; 903 904 state->opaque = g_new0(BDRVGlusterReopenState, 1); 905 reop_s = state->opaque; 906 907 qemu_gluster_parse_flags(state->flags, &open_flags); 908 909 gconf = g_new0(BlockdevOptionsGluster, 1); 910 gconf->debug = s->debug; 911 gconf->has_debug = true; 912 gconf->logfile = g_strdup(s->logfile); 913 gconf->has_logfile = true; 914 reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL, errp); 915 if (reop_s->glfs == NULL) { 916 ret = -errno; 917 goto exit; 918 } 919 920 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT 921 ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind", 922 "resync-failed-syncs-after-fsync", "on"); 923 if (ret < 0) { 924 error_setg_errno(errp, errno, "Unable to set xlator key/value pair"); 925 ret = -errno; 926 goto exit; 927 } 928 #endif 929 930 reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags); 931 if (reop_s->fd == NULL) { 932 /* reops->glfs will be cleaned up in _abort */ 933 ret = -errno; 934 goto exit; 935 } 936 937 exit: 938 /* state->opaque will be freed in either the _abort or _commit */ 939 qapi_free_BlockdevOptionsGluster(gconf); 940 return ret; 941 } 942 943 static void qemu_gluster_reopen_commit(BDRVReopenState *state) 944 { 945 BDRVGlusterReopenState *reop_s = state->opaque; 946 BDRVGlusterState *s = state->bs->opaque; 947 948 949 /* close the old */ 950 if (s->fd) { 951 glfs_close(s->fd); 952 } 953 954 glfs_clear_preopened(s->glfs); 955 956 /* use the newly opened image / connection */ 957 s->fd = reop_s->fd; 958 s->glfs = reop_s->glfs; 959 960 g_free(state->opaque); 961 state->opaque = NULL; 962 963 return; 964 } 965 966 967 static void qemu_gluster_reopen_abort(BDRVReopenState *state) 968 { 969 BDRVGlusterReopenState *reop_s = state->opaque; 970 971 if (reop_s == NULL) { 972 return; 973 } 974 975 if (reop_s->fd) { 976 glfs_close(reop_s->fd); 977 } 978 979 glfs_clear_preopened(reop_s->glfs); 980 981 g_free(state->opaque); 982 state->opaque = NULL; 983 984 return; 985 } 986 987 #ifdef CONFIG_GLUSTERFS_ZEROFILL 988 static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs, 989 int64_t offset, 990 int size, 991 BdrvRequestFlags flags) 992 { 993 int ret; 994 GlusterAIOCB acb; 995 BDRVGlusterState *s = bs->opaque; 996 997 acb.size = size; 998 acb.ret = 0; 999 acb.coroutine = qemu_coroutine_self(); 1000 acb.aio_context = bdrv_get_aio_context(bs); 1001 1002 ret = glfs_zerofill_async(s->fd, offset, size, gluster_finish_aiocb, &acb); 1003 if (ret < 0) { 1004 return -errno; 1005 } 1006 1007 qemu_coroutine_yield(); 1008 return acb.ret; 1009 } 1010 #endif 1011 1012 static int qemu_gluster_do_truncate(struct glfs_fd *fd, int64_t offset, 1013 PreallocMode prealloc, Error **errp) 1014 { 1015 int64_t current_length; 1016 1017 current_length = glfs_lseek(fd, 0, SEEK_END); 1018 if (current_length < 0) { 1019 error_setg_errno(errp, errno, "Failed to determine current size"); 1020 return -errno; 1021 } 1022 1023 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) { 1024 error_setg(errp, "Cannot use preallocation for shrinking files"); 1025 return -ENOTSUP; 1026 } 1027 1028 if (current_length == offset) { 1029 return 0; 1030 } 1031 1032 switch (prealloc) { 1033 #ifdef CONFIG_GLUSTERFS_FALLOCATE 1034 case PREALLOC_MODE_FALLOC: 1035 if (glfs_fallocate(fd, 0, current_length, offset - current_length)) { 1036 error_setg_errno(errp, errno, "Could not preallocate data"); 1037 return -errno; 1038 } 1039 break; 1040 #endif /* CONFIG_GLUSTERFS_FALLOCATE */ 1041 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1042 case PREALLOC_MODE_FULL: 1043 if (glfs_ftruncate(fd, offset)) { 1044 error_setg_errno(errp, errno, "Could not resize file"); 1045 return -errno; 1046 } 1047 if (glfs_zerofill(fd, current_length, offset - current_length)) { 1048 error_setg_errno(errp, errno, "Could not zerofill the new area"); 1049 return -errno; 1050 } 1051 break; 1052 #endif /* CONFIG_GLUSTERFS_ZEROFILL */ 1053 case PREALLOC_MODE_OFF: 1054 if (glfs_ftruncate(fd, offset)) { 1055 error_setg_errno(errp, errno, "Could not resize file"); 1056 return -errno; 1057 } 1058 break; 1059 default: 1060 error_setg(errp, "Unsupported preallocation mode: %s", 1061 PreallocMode_str(prealloc)); 1062 return -EINVAL; 1063 } 1064 1065 return 0; 1066 } 1067 1068 static int qemu_gluster_co_create(BlockdevCreateOptions *options, 1069 Error **errp) 1070 { 1071 BlockdevCreateOptionsGluster *opts = &options->u.gluster; 1072 struct glfs *glfs; 1073 struct glfs_fd *fd = NULL; 1074 int ret = 0; 1075 1076 assert(options->driver == BLOCKDEV_DRIVER_GLUSTER); 1077 1078 glfs = qemu_gluster_glfs_init(opts->location, errp); 1079 if (!glfs) { 1080 ret = -errno; 1081 goto out; 1082 } 1083 1084 fd = glfs_creat(glfs, opts->location->path, 1085 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR); 1086 if (!fd) { 1087 ret = -errno; 1088 goto out; 1089 } 1090 1091 ret = qemu_gluster_do_truncate(fd, opts->size, opts->preallocation, errp); 1092 1093 out: 1094 if (fd) { 1095 if (glfs_close(fd) != 0 && ret == 0) { 1096 ret = -errno; 1097 } 1098 } 1099 glfs_clear_preopened(glfs); 1100 return ret; 1101 } 1102 1103 static int coroutine_fn qemu_gluster_co_create_opts(const char *filename, 1104 QemuOpts *opts, 1105 Error **errp) 1106 { 1107 BlockdevCreateOptions *options; 1108 BlockdevCreateOptionsGluster *gopts; 1109 BlockdevOptionsGluster *gconf; 1110 char *tmp = NULL; 1111 Error *local_err = NULL; 1112 int ret; 1113 1114 options = g_new0(BlockdevCreateOptions, 1); 1115 options->driver = BLOCKDEV_DRIVER_GLUSTER; 1116 gopts = &options->u.gluster; 1117 1118 gconf = g_new0(BlockdevOptionsGluster, 1); 1119 gopts->location = gconf; 1120 1121 gopts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1122 BDRV_SECTOR_SIZE); 1123 1124 tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); 1125 gopts->preallocation = qapi_enum_parse(&PreallocMode_lookup, tmp, 1126 PREALLOC_MODE_OFF, &local_err); 1127 g_free(tmp); 1128 if (local_err) { 1129 error_propagate(errp, local_err); 1130 ret = -EINVAL; 1131 goto fail; 1132 } 1133 1134 gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG, 1135 GLUSTER_DEBUG_DEFAULT); 1136 if (gconf->debug < 0) { 1137 gconf->debug = 0; 1138 } else if (gconf->debug > GLUSTER_DEBUG_MAX) { 1139 gconf->debug = GLUSTER_DEBUG_MAX; 1140 } 1141 gconf->has_debug = true; 1142 1143 gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE); 1144 if (!gconf->logfile) { 1145 gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT); 1146 } 1147 gconf->has_logfile = true; 1148 1149 ret = qemu_gluster_parse(gconf, filename, NULL, errp); 1150 if (ret < 0) { 1151 goto fail; 1152 } 1153 1154 ret = qemu_gluster_co_create(options, errp); 1155 if (ret < 0) { 1156 goto fail; 1157 } 1158 1159 ret = 0; 1160 fail: 1161 qapi_free_BlockdevCreateOptions(options); 1162 return ret; 1163 } 1164 1165 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs, 1166 int64_t sector_num, int nb_sectors, 1167 QEMUIOVector *qiov, int write) 1168 { 1169 int ret; 1170 GlusterAIOCB acb; 1171 BDRVGlusterState *s = bs->opaque; 1172 size_t size = nb_sectors * BDRV_SECTOR_SIZE; 1173 off_t offset = sector_num * BDRV_SECTOR_SIZE; 1174 1175 acb.size = size; 1176 acb.ret = 0; 1177 acb.coroutine = qemu_coroutine_self(); 1178 acb.aio_context = bdrv_get_aio_context(bs); 1179 1180 if (write) { 1181 ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0, 1182 gluster_finish_aiocb, &acb); 1183 } else { 1184 ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0, 1185 gluster_finish_aiocb, &acb); 1186 } 1187 1188 if (ret < 0) { 1189 return -errno; 1190 } 1191 1192 qemu_coroutine_yield(); 1193 return acb.ret; 1194 } 1195 1196 static coroutine_fn int qemu_gluster_co_truncate(BlockDriverState *bs, 1197 int64_t offset, 1198 PreallocMode prealloc, 1199 Error **errp) 1200 { 1201 BDRVGlusterState *s = bs->opaque; 1202 return qemu_gluster_do_truncate(s->fd, offset, prealloc, errp); 1203 } 1204 1205 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs, 1206 int64_t sector_num, 1207 int nb_sectors, 1208 QEMUIOVector *qiov) 1209 { 1210 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0); 1211 } 1212 1213 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs, 1214 int64_t sector_num, 1215 int nb_sectors, 1216 QEMUIOVector *qiov, 1217 int flags) 1218 { 1219 assert(!flags); 1220 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1); 1221 } 1222 1223 static void qemu_gluster_close(BlockDriverState *bs) 1224 { 1225 BDRVGlusterState *s = bs->opaque; 1226 1227 g_free(s->logfile); 1228 if (s->fd) { 1229 glfs_close(s->fd); 1230 s->fd = NULL; 1231 } 1232 glfs_clear_preopened(s->glfs); 1233 } 1234 1235 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs) 1236 { 1237 int ret; 1238 GlusterAIOCB acb; 1239 BDRVGlusterState *s = bs->opaque; 1240 1241 acb.size = 0; 1242 acb.ret = 0; 1243 acb.coroutine = qemu_coroutine_self(); 1244 acb.aio_context = bdrv_get_aio_context(bs); 1245 1246 ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb); 1247 if (ret < 0) { 1248 ret = -errno; 1249 goto error; 1250 } 1251 1252 qemu_coroutine_yield(); 1253 if (acb.ret < 0) { 1254 ret = acb.ret; 1255 goto error; 1256 } 1257 1258 return acb.ret; 1259 1260 error: 1261 /* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache 1262 * after a fsync failure, so we have no way of allowing the guest to safely 1263 * continue. Gluster versions prior to 3.5.6 don't retain the cache 1264 * either, but will invalidate the fd on error, so this is again our only 1265 * option. 1266 * 1267 * The 'resync-failed-syncs-after-fsync' xlator option for the 1268 * write-behind cache will cause later gluster versions to retain its 1269 * cache after error, so long as the fd remains open. However, we 1270 * currently have no way of knowing if this option is supported. 1271 * 1272 * TODO: Once gluster provides a way for us to determine if the option 1273 * is supported, bypass the closure and setting drv to NULL. */ 1274 qemu_gluster_close(bs); 1275 bs->drv = NULL; 1276 return ret; 1277 } 1278 1279 #ifdef CONFIG_GLUSTERFS_DISCARD 1280 static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs, 1281 int64_t offset, int size) 1282 { 1283 int ret; 1284 GlusterAIOCB acb; 1285 BDRVGlusterState *s = bs->opaque; 1286 1287 acb.size = 0; 1288 acb.ret = 0; 1289 acb.coroutine = qemu_coroutine_self(); 1290 acb.aio_context = bdrv_get_aio_context(bs); 1291 1292 ret = glfs_discard_async(s->fd, offset, size, gluster_finish_aiocb, &acb); 1293 if (ret < 0) { 1294 return -errno; 1295 } 1296 1297 qemu_coroutine_yield(); 1298 return acb.ret; 1299 } 1300 #endif 1301 1302 static int64_t qemu_gluster_getlength(BlockDriverState *bs) 1303 { 1304 BDRVGlusterState *s = bs->opaque; 1305 int64_t ret; 1306 1307 ret = glfs_lseek(s->fd, 0, SEEK_END); 1308 if (ret < 0) { 1309 return -errno; 1310 } else { 1311 return ret; 1312 } 1313 } 1314 1315 static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs) 1316 { 1317 BDRVGlusterState *s = bs->opaque; 1318 struct stat st; 1319 int ret; 1320 1321 ret = glfs_fstat(s->fd, &st); 1322 if (ret < 0) { 1323 return -errno; 1324 } else { 1325 return st.st_blocks * 512; 1326 } 1327 } 1328 1329 static int qemu_gluster_has_zero_init(BlockDriverState *bs) 1330 { 1331 /* GlusterFS volume could be backed by a block device */ 1332 return 0; 1333 } 1334 1335 /* 1336 * Find allocation range in @bs around offset @start. 1337 * May change underlying file descriptor's file offset. 1338 * If @start is not in a hole, store @start in @data, and the 1339 * beginning of the next hole in @hole, and return 0. 1340 * If @start is in a non-trailing hole, store @start in @hole and the 1341 * beginning of the next non-hole in @data, and return 0. 1342 * If @start is in a trailing hole or beyond EOF, return -ENXIO. 1343 * If we can't find out, return a negative errno other than -ENXIO. 1344 * 1345 * (Shamefully copied from file-posix.c, only minuscule adaptions.) 1346 */ 1347 static int find_allocation(BlockDriverState *bs, off_t start, 1348 off_t *data, off_t *hole) 1349 { 1350 BDRVGlusterState *s = bs->opaque; 1351 1352 if (!s->supports_seek_data) { 1353 goto exit; 1354 } 1355 1356 #if defined SEEK_HOLE && defined SEEK_DATA 1357 off_t offs; 1358 1359 /* 1360 * SEEK_DATA cases: 1361 * D1. offs == start: start is in data 1362 * D2. offs > start: start is in a hole, next data at offs 1363 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole 1364 * or start is beyond EOF 1365 * If the latter happens, the file has been truncated behind 1366 * our back since we opened it. All bets are off then. 1367 * Treating like a trailing hole is simplest. 1368 * D4. offs < 0, errno != ENXIO: we learned nothing 1369 */ 1370 offs = glfs_lseek(s->fd, start, SEEK_DATA); 1371 if (offs < 0) { 1372 return -errno; /* D3 or D4 */ 1373 } 1374 1375 if (offs < start) { 1376 /* This is not a valid return by lseek(). We are safe to just return 1377 * -EIO in this case, and we'll treat it like D4. Unfortunately some 1378 * versions of gluster server will return offs < start, so an assert 1379 * here will unnecessarily abort QEMU. */ 1380 return -EIO; 1381 } 1382 1383 if (offs > start) { 1384 /* D2: in hole, next data at offs */ 1385 *hole = start; 1386 *data = offs; 1387 return 0; 1388 } 1389 1390 /* D1: in data, end not yet known */ 1391 1392 /* 1393 * SEEK_HOLE cases: 1394 * H1. offs == start: start is in a hole 1395 * If this happens here, a hole has been dug behind our back 1396 * since the previous lseek(). 1397 * H2. offs > start: either start is in data, next hole at offs, 1398 * or start is in trailing hole, EOF at offs 1399 * Linux treats trailing holes like any other hole: offs == 1400 * start. Solaris seeks to EOF instead: offs > start (blech). 1401 * If that happens here, a hole has been dug behind our back 1402 * since the previous lseek(). 1403 * H3. offs < 0, errno = ENXIO: start is beyond EOF 1404 * If this happens, the file has been truncated behind our 1405 * back since we opened it. Treat it like a trailing hole. 1406 * H4. offs < 0, errno != ENXIO: we learned nothing 1407 * Pretend we know nothing at all, i.e. "forget" about D1. 1408 */ 1409 offs = glfs_lseek(s->fd, start, SEEK_HOLE); 1410 if (offs < 0) { 1411 return -errno; /* D1 and (H3 or H4) */ 1412 } 1413 1414 if (offs < start) { 1415 /* This is not a valid return by lseek(). We are safe to just return 1416 * -EIO in this case, and we'll treat it like H4. Unfortunately some 1417 * versions of gluster server will return offs < start, so an assert 1418 * here will unnecessarily abort QEMU. */ 1419 return -EIO; 1420 } 1421 1422 if (offs > start) { 1423 /* 1424 * D1 and H2: either in data, next hole at offs, or it was in 1425 * data but is now in a trailing hole. In the latter case, 1426 * all bets are off. Treating it as if it there was data all 1427 * the way to EOF is safe, so simply do that. 1428 */ 1429 *data = start; 1430 *hole = offs; 1431 return 0; 1432 } 1433 1434 /* D1 and H1 */ 1435 return -EBUSY; 1436 #endif 1437 1438 exit: 1439 return -ENOTSUP; 1440 } 1441 1442 /* 1443 * Returns the allocation status of the specified offset. 1444 * 1445 * The block layer guarantees 'offset' and 'bytes' are within bounds. 1446 * 1447 * 'pnum' is set to the number of bytes (including and immediately following 1448 * the specified offset) that are known to be in the same 1449 * allocated/unallocated state. 1450 * 1451 * 'bytes' is the max value 'pnum' should be set to. 1452 * 1453 * (Based on raw_co_block_status() from file-posix.c.) 1454 */ 1455 static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs, 1456 bool want_zero, 1457 int64_t offset, 1458 int64_t bytes, 1459 int64_t *pnum, 1460 int64_t *map, 1461 BlockDriverState **file) 1462 { 1463 BDRVGlusterState *s = bs->opaque; 1464 off_t data = 0, hole = 0; 1465 int ret = -EINVAL; 1466 1467 if (!s->fd) { 1468 return ret; 1469 } 1470 1471 if (!want_zero) { 1472 *pnum = bytes; 1473 *map = offset; 1474 *file = bs; 1475 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 1476 } 1477 1478 ret = find_allocation(bs, offset, &data, &hole); 1479 if (ret == -ENXIO) { 1480 /* Trailing hole */ 1481 *pnum = bytes; 1482 ret = BDRV_BLOCK_ZERO; 1483 } else if (ret < 0) { 1484 /* No info available, so pretend there are no holes */ 1485 *pnum = bytes; 1486 ret = BDRV_BLOCK_DATA; 1487 } else if (data == offset) { 1488 /* On a data extent, compute bytes to the end of the extent, 1489 * possibly including a partial sector at EOF. */ 1490 *pnum = MIN(bytes, hole - offset); 1491 ret = BDRV_BLOCK_DATA; 1492 } else { 1493 /* On a hole, compute bytes to the beginning of the next extent. */ 1494 assert(hole == offset); 1495 *pnum = MIN(bytes, data - offset); 1496 ret = BDRV_BLOCK_ZERO; 1497 } 1498 1499 *map = offset; 1500 *file = bs; 1501 1502 return ret | BDRV_BLOCK_OFFSET_VALID; 1503 } 1504 1505 1506 static const char *const gluster_strong_open_opts[] = { 1507 GLUSTER_OPT_VOLUME, 1508 GLUSTER_OPT_PATH, 1509 GLUSTER_OPT_TYPE, 1510 GLUSTER_OPT_SERVER_PATTERN, 1511 GLUSTER_OPT_HOST, 1512 GLUSTER_OPT_PORT, 1513 GLUSTER_OPT_TO, 1514 GLUSTER_OPT_IPV4, 1515 GLUSTER_OPT_IPV6, 1516 GLUSTER_OPT_SOCKET, 1517 1518 NULL 1519 }; 1520 1521 static BlockDriver bdrv_gluster = { 1522 .format_name = "gluster", 1523 .protocol_name = "gluster", 1524 .instance_size = sizeof(BDRVGlusterState), 1525 .bdrv_needs_filename = false, 1526 .bdrv_file_open = qemu_gluster_open, 1527 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1528 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1529 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1530 .bdrv_close = qemu_gluster_close, 1531 .bdrv_co_create = qemu_gluster_co_create, 1532 .bdrv_co_create_opts = qemu_gluster_co_create_opts, 1533 .bdrv_getlength = qemu_gluster_getlength, 1534 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1535 .bdrv_co_truncate = qemu_gluster_co_truncate, 1536 .bdrv_co_readv = qemu_gluster_co_readv, 1537 .bdrv_co_writev = qemu_gluster_co_writev, 1538 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1539 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1540 #ifdef CONFIG_GLUSTERFS_DISCARD 1541 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1542 #endif 1543 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1544 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1545 #endif 1546 .bdrv_co_block_status = qemu_gluster_co_block_status, 1547 .create_opts = &qemu_gluster_create_opts, 1548 .strong_runtime_opts = gluster_strong_open_opts, 1549 }; 1550 1551 static BlockDriver bdrv_gluster_tcp = { 1552 .format_name = "gluster", 1553 .protocol_name = "gluster+tcp", 1554 .instance_size = sizeof(BDRVGlusterState), 1555 .bdrv_needs_filename = false, 1556 .bdrv_file_open = qemu_gluster_open, 1557 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1558 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1559 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1560 .bdrv_close = qemu_gluster_close, 1561 .bdrv_co_create = qemu_gluster_co_create, 1562 .bdrv_co_create_opts = qemu_gluster_co_create_opts, 1563 .bdrv_getlength = qemu_gluster_getlength, 1564 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1565 .bdrv_co_truncate = qemu_gluster_co_truncate, 1566 .bdrv_co_readv = qemu_gluster_co_readv, 1567 .bdrv_co_writev = qemu_gluster_co_writev, 1568 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1569 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1570 #ifdef CONFIG_GLUSTERFS_DISCARD 1571 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1572 #endif 1573 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1574 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1575 #endif 1576 .bdrv_co_block_status = qemu_gluster_co_block_status, 1577 .create_opts = &qemu_gluster_create_opts, 1578 .strong_runtime_opts = gluster_strong_open_opts, 1579 }; 1580 1581 static BlockDriver bdrv_gluster_unix = { 1582 .format_name = "gluster", 1583 .protocol_name = "gluster+unix", 1584 .instance_size = sizeof(BDRVGlusterState), 1585 .bdrv_needs_filename = true, 1586 .bdrv_file_open = qemu_gluster_open, 1587 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1588 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1589 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1590 .bdrv_close = qemu_gluster_close, 1591 .bdrv_co_create = qemu_gluster_co_create, 1592 .bdrv_co_create_opts = qemu_gluster_co_create_opts, 1593 .bdrv_getlength = qemu_gluster_getlength, 1594 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1595 .bdrv_co_truncate = qemu_gluster_co_truncate, 1596 .bdrv_co_readv = qemu_gluster_co_readv, 1597 .bdrv_co_writev = qemu_gluster_co_writev, 1598 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1599 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1600 #ifdef CONFIG_GLUSTERFS_DISCARD 1601 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1602 #endif 1603 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1604 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1605 #endif 1606 .bdrv_co_block_status = qemu_gluster_co_block_status, 1607 .create_opts = &qemu_gluster_create_opts, 1608 .strong_runtime_opts = gluster_strong_open_opts, 1609 }; 1610 1611 /* rdma is deprecated (actually never supported for volfile fetch). 1612 * Let's maintain it for the protocol compatibility, to make sure things 1613 * won't break immediately. For now, gluster+rdma will fall back to gluster+tcp 1614 * protocol with a warning. 1615 * TODO: remove gluster+rdma interface support 1616 */ 1617 static BlockDriver bdrv_gluster_rdma = { 1618 .format_name = "gluster", 1619 .protocol_name = "gluster+rdma", 1620 .instance_size = sizeof(BDRVGlusterState), 1621 .bdrv_needs_filename = true, 1622 .bdrv_file_open = qemu_gluster_open, 1623 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1624 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1625 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1626 .bdrv_close = qemu_gluster_close, 1627 .bdrv_co_create = qemu_gluster_co_create, 1628 .bdrv_co_create_opts = qemu_gluster_co_create_opts, 1629 .bdrv_getlength = qemu_gluster_getlength, 1630 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size, 1631 .bdrv_co_truncate = qemu_gluster_co_truncate, 1632 .bdrv_co_readv = qemu_gluster_co_readv, 1633 .bdrv_co_writev = qemu_gluster_co_writev, 1634 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1635 .bdrv_has_zero_init = qemu_gluster_has_zero_init, 1636 #ifdef CONFIG_GLUSTERFS_DISCARD 1637 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1638 #endif 1639 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1640 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1641 #endif 1642 .bdrv_co_block_status = qemu_gluster_co_block_status, 1643 .create_opts = &qemu_gluster_create_opts, 1644 .strong_runtime_opts = gluster_strong_open_opts, 1645 }; 1646 1647 static void bdrv_gluster_init(void) 1648 { 1649 bdrv_register(&bdrv_gluster_rdma); 1650 bdrv_register(&bdrv_gluster_unix); 1651 bdrv_register(&bdrv_gluster_tcp); 1652 bdrv_register(&bdrv_gluster); 1653 } 1654 1655 block_init(bdrv_gluster_init); 1656