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 "qemu/units.h" 13 #include <glusterfs/api/glfs.h> 14 #include "block/block-io.h" 15 #include "block/block_int.h" 16 #include "block/qdict.h" 17 #include "qapi/error.h" 18 #include "qapi/qmp/qdict.h" 19 #include "qapi/qmp/qerror.h" 20 #include "qemu/uri.h" 21 #include "qemu/error-report.h" 22 #include "qemu/module.h" 23 #include "qemu/option.h" 24 #include "qemu/cutils.h" 25 26 #ifdef CONFIG_GLUSTERFS_FTRUNCATE_HAS_STAT 27 # define glfs_ftruncate(fd, offset) glfs_ftruncate(fd, offset, NULL, NULL) 28 #endif 29 30 #define GLUSTER_OPT_FILENAME "filename" 31 #define GLUSTER_OPT_VOLUME "volume" 32 #define GLUSTER_OPT_PATH "path" 33 #define GLUSTER_OPT_TYPE "type" 34 #define GLUSTER_OPT_SERVER_PATTERN "server." 35 #define GLUSTER_OPT_HOST "host" 36 #define GLUSTER_OPT_PORT "port" 37 #define GLUSTER_OPT_TO "to" 38 #define GLUSTER_OPT_IPV4 "ipv4" 39 #define GLUSTER_OPT_IPV6 "ipv6" 40 #define GLUSTER_OPT_SOCKET "socket" 41 #define GLUSTER_OPT_DEBUG "debug" 42 #define GLUSTER_DEFAULT_PORT 24007 43 #define GLUSTER_DEBUG_DEFAULT 4 44 #define GLUSTER_DEBUG_MAX 9 45 #define GLUSTER_OPT_LOGFILE "logfile" 46 #define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */ 47 /* 48 * Several versions of GlusterFS (3.12? -> 6.0.1) fail when the transfer size 49 * is greater or equal to 1024 MiB, so we are limiting the transfer size to 512 50 * MiB to avoid this rare issue. 51 */ 52 #define GLUSTER_MAX_TRANSFER (512 * MiB) 53 54 #define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n" 55 56 typedef struct GlusterAIOCB { 57 int64_t size; 58 int ret; 59 Coroutine *coroutine; 60 AioContext *aio_context; 61 } GlusterAIOCB; 62 63 typedef struct BDRVGlusterState { 64 struct glfs *glfs; 65 struct glfs_fd *fd; 66 char *logfile; 67 bool supports_seek_data; 68 int debug; 69 } BDRVGlusterState; 70 71 typedef struct BDRVGlusterReopenState { 72 struct glfs *glfs; 73 struct glfs_fd *fd; 74 } BDRVGlusterReopenState; 75 76 77 typedef struct GlfsPreopened { 78 char *volume; 79 glfs_t *fs; 80 int ref; 81 } GlfsPreopened; 82 83 typedef struct ListElement { 84 QLIST_ENTRY(ListElement) list; 85 GlfsPreopened saved; 86 } ListElement; 87 88 static QLIST_HEAD(, ListElement) glfs_list; 89 90 static QemuOptsList qemu_gluster_create_opts = { 91 .name = "qemu-gluster-create-opts", 92 .head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head), 93 .desc = { 94 { 95 .name = BLOCK_OPT_SIZE, 96 .type = QEMU_OPT_SIZE, 97 .help = "Virtual disk size" 98 }, 99 { 100 .name = BLOCK_OPT_PREALLOC, 101 .type = QEMU_OPT_STRING, 102 .help = "Preallocation mode (allowed values: off" 103 #ifdef CONFIG_GLUSTERFS_FALLOCATE 104 ", falloc" 105 #endif 106 #ifdef CONFIG_GLUSTERFS_ZEROFILL 107 ", full" 108 #endif 109 ")" 110 }, 111 { 112 .name = GLUSTER_OPT_DEBUG, 113 .type = QEMU_OPT_NUMBER, 114 .help = "Gluster log level, valid range is 0-9", 115 }, 116 { 117 .name = GLUSTER_OPT_LOGFILE, 118 .type = QEMU_OPT_STRING, 119 .help = "Logfile path of libgfapi", 120 }, 121 { /* end of list */ } 122 } 123 }; 124 125 static QemuOptsList runtime_opts = { 126 .name = "gluster", 127 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 128 .desc = { 129 { 130 .name = GLUSTER_OPT_FILENAME, 131 .type = QEMU_OPT_STRING, 132 .help = "URL to the gluster image", 133 }, 134 { 135 .name = GLUSTER_OPT_DEBUG, 136 .type = QEMU_OPT_NUMBER, 137 .help = "Gluster log level, valid range is 0-9", 138 }, 139 { 140 .name = GLUSTER_OPT_LOGFILE, 141 .type = QEMU_OPT_STRING, 142 .help = "Logfile path of libgfapi", 143 }, 144 { /* end of list */ } 145 }, 146 }; 147 148 static QemuOptsList runtime_json_opts = { 149 .name = "gluster_json", 150 .head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head), 151 .desc = { 152 { 153 .name = GLUSTER_OPT_VOLUME, 154 .type = QEMU_OPT_STRING, 155 .help = "name of gluster volume where VM image resides", 156 }, 157 { 158 .name = GLUSTER_OPT_PATH, 159 .type = QEMU_OPT_STRING, 160 .help = "absolute path to image file in gluster volume", 161 }, 162 { 163 .name = GLUSTER_OPT_DEBUG, 164 .type = QEMU_OPT_NUMBER, 165 .help = "Gluster log level, valid range is 0-9", 166 }, 167 { /* end of list */ } 168 }, 169 }; 170 171 static QemuOptsList runtime_type_opts = { 172 .name = "gluster_type", 173 .head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head), 174 .desc = { 175 { 176 .name = GLUSTER_OPT_TYPE, 177 .type = QEMU_OPT_STRING, 178 .help = "inet|unix", 179 }, 180 { /* end of list */ } 181 }, 182 }; 183 184 static QemuOptsList runtime_unix_opts = { 185 .name = "gluster_unix", 186 .head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head), 187 .desc = { 188 { 189 .name = GLUSTER_OPT_SOCKET, 190 .type = QEMU_OPT_STRING, 191 .help = "socket file path (legacy)", 192 }, 193 { 194 .name = GLUSTER_OPT_PATH, 195 .type = QEMU_OPT_STRING, 196 .help = "socket file path (QAPI)", 197 }, 198 { /* end of list */ } 199 }, 200 }; 201 202 static QemuOptsList runtime_inet_opts = { 203 .name = "gluster_inet", 204 .head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head), 205 .desc = { 206 { 207 .name = GLUSTER_OPT_TYPE, 208 .type = QEMU_OPT_STRING, 209 .help = "inet|unix", 210 }, 211 { 212 .name = GLUSTER_OPT_HOST, 213 .type = QEMU_OPT_STRING, 214 .help = "host address (hostname/ipv4/ipv6 addresses)", 215 }, 216 { 217 .name = GLUSTER_OPT_PORT, 218 .type = QEMU_OPT_STRING, 219 .help = "port number on which glusterd is listening (default 24007)", 220 }, 221 { 222 .name = "to", 223 .type = QEMU_OPT_NUMBER, 224 .help = "max port number, not supported by gluster", 225 }, 226 { 227 .name = "ipv4", 228 .type = QEMU_OPT_BOOL, 229 .help = "ipv4 bool value, not supported by gluster", 230 }, 231 { 232 .name = "ipv6", 233 .type = QEMU_OPT_BOOL, 234 .help = "ipv6 bool value, not supported by gluster", 235 }, 236 { /* end of list */ } 237 }, 238 }; 239 240 static void glfs_set_preopened(const char *volume, glfs_t *fs) 241 { 242 ListElement *entry = NULL; 243 244 entry = g_new(ListElement, 1); 245 246 entry->saved.volume = g_strdup(volume); 247 248 entry->saved.fs = fs; 249 entry->saved.ref = 1; 250 251 QLIST_INSERT_HEAD(&glfs_list, entry, list); 252 } 253 254 static glfs_t *glfs_find_preopened(const char *volume) 255 { 256 ListElement *entry = NULL; 257 258 QLIST_FOREACH(entry, &glfs_list, list) { 259 if (strcmp(entry->saved.volume, volume) == 0) { 260 entry->saved.ref++; 261 return entry->saved.fs; 262 } 263 } 264 265 return NULL; 266 } 267 268 static void glfs_clear_preopened(glfs_t *fs) 269 { 270 ListElement *entry = NULL; 271 ListElement *next; 272 273 if (fs == NULL) { 274 return; 275 } 276 277 QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) { 278 if (entry->saved.fs == fs) { 279 if (--entry->saved.ref) { 280 return; 281 } 282 283 QLIST_REMOVE(entry, list); 284 285 glfs_fini(entry->saved.fs); 286 g_free(entry->saved.volume); 287 g_free(entry); 288 } 289 } 290 } 291 292 static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path) 293 { 294 char *p, *q; 295 296 if (!path) { 297 return -EINVAL; 298 } 299 300 /* volume */ 301 p = q = path + strspn(path, "/"); 302 p += strcspn(p, "/"); 303 if (*p == '\0') { 304 return -EINVAL; 305 } 306 gconf->volume = g_strndup(q, p - q); 307 308 /* path */ 309 p += strspn(p, "/"); 310 if (*p == '\0') { 311 return -EINVAL; 312 } 313 gconf->path = g_strdup(p); 314 return 0; 315 } 316 317 /* 318 * file=gluster[+transport]://[host[:port]]/volume/path[?socket=...] 319 * 320 * 'gluster' is the protocol. 321 * 322 * 'transport' specifies the transport type used to connect to gluster 323 * management daemon (glusterd). Valid transport types are 324 * tcp or unix. If a transport type isn't specified, then tcp type is assumed. 325 * 326 * 'host' specifies the host where the volume file specification for 327 * the given volume resides. This can be either hostname or ipv4 address. 328 * If transport type is 'unix', then 'host' field should not be specified. 329 * The 'socket' field needs to be populated with the path to unix domain 330 * socket. 331 * 332 * 'port' is the port number on which glusterd is listening. This is optional 333 * and if not specified, QEMU will send 0 which will make gluster to use the 334 * default port. If the transport type is unix, then 'port' should not be 335 * specified. 336 * 337 * 'volume' is the name of the gluster volume which contains the VM image. 338 * 339 * 'path' is the path to the actual VM image that resides on gluster volume. 340 * 341 * Examples: 342 * 343 * file=gluster://1.2.3.4/testvol/a.img 344 * file=gluster+tcp://1.2.3.4/testvol/a.img 345 * file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img 346 * file=gluster+tcp://host.domain.com:24007/testvol/dir/a.img 347 * file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket 348 */ 349 static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf, 350 const char *filename) 351 { 352 SocketAddress *gsconf; 353 URI *uri; 354 QueryParams *qp = NULL; 355 bool is_unix = false; 356 int ret = 0; 357 358 uri = uri_parse(filename); 359 if (!uri) { 360 return -EINVAL; 361 } 362 363 gsconf = g_new0(SocketAddress, 1); 364 QAPI_LIST_PREPEND(gconf->server, gsconf); 365 366 /* transport */ 367 if (!uri->scheme || !strcmp(uri->scheme, "gluster")) { 368 gsconf->type = SOCKET_ADDRESS_TYPE_INET; 369 } else if (!strcmp(uri->scheme, "gluster+tcp")) { 370 gsconf->type = SOCKET_ADDRESS_TYPE_INET; 371 } else if (!strcmp(uri->scheme, "gluster+unix")) { 372 gsconf->type = SOCKET_ADDRESS_TYPE_UNIX; 373 is_unix = true; 374 } else { 375 ret = -EINVAL; 376 goto out; 377 } 378 379 ret = parse_volume_options(gconf, uri->path); 380 if (ret < 0) { 381 goto out; 382 } 383 384 qp = query_params_parse(uri->query); 385 if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { 386 ret = -EINVAL; 387 goto out; 388 } 389 390 if (is_unix) { 391 if (uri->server || uri->port) { 392 ret = -EINVAL; 393 goto out; 394 } 395 if (strcmp(qp->p[0].name, "socket")) { 396 ret = -EINVAL; 397 goto out; 398 } 399 gsconf->u.q_unix.path = g_strdup(qp->p[0].value); 400 } else { 401 gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost"); 402 if (uri->port) { 403 gsconf->u.inet.port = g_strdup_printf("%d", uri->port); 404 } else { 405 gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT); 406 } 407 } 408 409 out: 410 if (qp) { 411 query_params_free(qp); 412 } 413 uri_free(uri); 414 return ret; 415 } 416 417 static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf, 418 Error **errp) 419 { 420 struct glfs *glfs; 421 int ret; 422 int old_errno; 423 SocketAddressList *server; 424 uint64_t port; 425 426 glfs = glfs_find_preopened(gconf->volume); 427 if (glfs) { 428 return glfs; 429 } 430 431 glfs = glfs_new(gconf->volume); 432 if (!glfs) { 433 goto out; 434 } 435 436 glfs_set_preopened(gconf->volume, glfs); 437 438 for (server = gconf->server; server; server = server->next) { 439 switch (server->value->type) { 440 case SOCKET_ADDRESS_TYPE_UNIX: 441 ret = glfs_set_volfile_server(glfs, "unix", 442 server->value->u.q_unix.path, 0); 443 break; 444 case SOCKET_ADDRESS_TYPE_INET: 445 if (parse_uint_full(server->value->u.inet.port, 10, &port) < 0 || 446 port > 65535) { 447 error_setg(errp, "'%s' is not a valid port number", 448 server->value->u.inet.port); 449 errno = EINVAL; 450 goto out; 451 } 452 ret = glfs_set_volfile_server(glfs, "tcp", 453 server->value->u.inet.host, 454 (int)port); 455 break; 456 case SOCKET_ADDRESS_TYPE_VSOCK: 457 case SOCKET_ADDRESS_TYPE_FD: 458 default: 459 abort(); 460 } 461 462 if (ret < 0) { 463 goto out; 464 } 465 } 466 467 ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug); 468 if (ret < 0) { 469 goto out; 470 } 471 472 ret = glfs_init(glfs); 473 if (ret) { 474 error_setg(errp, "Gluster connection for volume %s, path %s failed" 475 " to connect", gconf->volume, gconf->path); 476 for (server = gconf->server; server; server = server->next) { 477 if (server->value->type == SOCKET_ADDRESS_TYPE_UNIX) { 478 error_append_hint(errp, "hint: failed on socket %s ", 479 server->value->u.q_unix.path); 480 } else { 481 error_append_hint(errp, "hint: failed on host %s and port %s ", 482 server->value->u.inet.host, 483 server->value->u.inet.port); 484 } 485 } 486 487 error_append_hint(errp, "Please refer to gluster logs for more info\n"); 488 489 /* glfs_init sometimes doesn't set errno although docs suggest that */ 490 if (errno == 0) { 491 errno = EINVAL; 492 } 493 494 goto out; 495 } 496 return glfs; 497 498 out: 499 if (glfs) { 500 old_errno = errno; 501 glfs_clear_preopened(glfs); 502 errno = old_errno; 503 } 504 return NULL; 505 } 506 507 /* 508 * Convert the json formatted command line into qapi. 509 */ 510 static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf, 511 QDict *options, Error **errp) 512 { 513 QemuOpts *opts; 514 SocketAddress *gsconf = NULL; 515 SocketAddressList **tail; 516 QDict *backing_options = NULL; 517 Error *local_err = NULL; 518 char *str = NULL; 519 const char *ptr; 520 int i, type, num_servers; 521 522 /* create opts info from runtime_json_opts list */ 523 opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort); 524 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 525 goto out; 526 } 527 528 num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN); 529 if (num_servers < 1) { 530 error_setg(&local_err, QERR_MISSING_PARAMETER, "server"); 531 goto out; 532 } 533 534 ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME); 535 if (!ptr) { 536 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME); 537 goto out; 538 } 539 gconf->volume = g_strdup(ptr); 540 541 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH); 542 if (!ptr) { 543 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH); 544 goto out; 545 } 546 gconf->path = g_strdup(ptr); 547 qemu_opts_del(opts); 548 tail = &gconf->server; 549 550 for (i = 0; i < num_servers; i++) { 551 str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i); 552 qdict_extract_subqdict(options, &backing_options, str); 553 554 /* create opts info from runtime_type_opts list */ 555 opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort); 556 if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) { 557 goto out; 558 } 559 560 ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE); 561 if (!ptr) { 562 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE); 563 error_append_hint(&local_err, GERR_INDEX_HINT, i); 564 goto out; 565 566 } 567 gsconf = g_new0(SocketAddress, 1); 568 if (!strcmp(ptr, "tcp")) { 569 ptr = "inet"; /* accept legacy "tcp" */ 570 } 571 type = qapi_enum_parse(&SocketAddressType_lookup, ptr, -1, NULL); 572 if (type != SOCKET_ADDRESS_TYPE_INET 573 && type != SOCKET_ADDRESS_TYPE_UNIX) { 574 error_setg(&local_err, 575 "Parameter '%s' may be 'inet' or 'unix'", 576 GLUSTER_OPT_TYPE); 577 error_append_hint(&local_err, GERR_INDEX_HINT, i); 578 goto out; 579 } 580 gsconf->type = type; 581 qemu_opts_del(opts); 582 583 if (gsconf->type == SOCKET_ADDRESS_TYPE_INET) { 584 /* create opts info from runtime_inet_opts list */ 585 opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort); 586 if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) { 587 goto out; 588 } 589 590 ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST); 591 if (!ptr) { 592 error_setg(&local_err, QERR_MISSING_PARAMETER, 593 GLUSTER_OPT_HOST); 594 error_append_hint(&local_err, GERR_INDEX_HINT, i); 595 goto out; 596 } 597 gsconf->u.inet.host = g_strdup(ptr); 598 ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT); 599 if (!ptr) { 600 error_setg(&local_err, QERR_MISSING_PARAMETER, 601 GLUSTER_OPT_PORT); 602 error_append_hint(&local_err, GERR_INDEX_HINT, i); 603 goto out; 604 } 605 gsconf->u.inet.port = g_strdup(ptr); 606 607 /* defend for unsupported fields in InetSocketAddress, 608 * i.e. @ipv4, @ipv6 and @to 609 */ 610 ptr = qemu_opt_get(opts, GLUSTER_OPT_TO); 611 if (ptr) { 612 gsconf->u.inet.has_to = true; 613 } 614 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4); 615 if (ptr) { 616 gsconf->u.inet.has_ipv4 = true; 617 } 618 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6); 619 if (ptr) { 620 gsconf->u.inet.has_ipv6 = true; 621 } 622 if (gsconf->u.inet.has_to) { 623 error_setg(&local_err, "Parameter 'to' not supported"); 624 goto out; 625 } 626 if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) { 627 error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported"); 628 goto out; 629 } 630 qemu_opts_del(opts); 631 } else { 632 /* create opts info from runtime_unix_opts list */ 633 opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort); 634 if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) { 635 goto out; 636 } 637 638 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH); 639 if (!ptr) { 640 ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET); 641 } else if (qemu_opt_get(opts, GLUSTER_OPT_SOCKET)) { 642 error_setg(&local_err, 643 "Conflicting parameters 'path' and 'socket'"); 644 error_append_hint(&local_err, GERR_INDEX_HINT, i); 645 goto out; 646 } 647 if (!ptr) { 648 error_setg(&local_err, QERR_MISSING_PARAMETER, 649 GLUSTER_OPT_PATH); 650 error_append_hint(&local_err, GERR_INDEX_HINT, i); 651 goto out; 652 } 653 gsconf->u.q_unix.path = g_strdup(ptr); 654 qemu_opts_del(opts); 655 } 656 657 QAPI_LIST_APPEND(tail, gsconf); 658 gsconf = NULL; 659 660 qobject_unref(backing_options); 661 backing_options = NULL; 662 g_free(str); 663 str = NULL; 664 } 665 666 return 0; 667 668 out: 669 error_propagate(errp, local_err); 670 qapi_free_SocketAddress(gsconf); 671 qemu_opts_del(opts); 672 g_free(str); 673 qobject_unref(backing_options); 674 errno = EINVAL; 675 return -errno; 676 } 677 678 /* Converts options given in @filename and the @options QDict into the QAPI 679 * object @gconf. */ 680 static int qemu_gluster_parse(BlockdevOptionsGluster *gconf, 681 const char *filename, 682 QDict *options, Error **errp) 683 { 684 int ret; 685 if (filename) { 686 ret = qemu_gluster_parse_uri(gconf, filename); 687 if (ret < 0) { 688 error_setg(errp, "invalid URI %s", filename); 689 error_append_hint(errp, "Usage: file=gluster[+transport]://" 690 "[host[:port]]volume/path[?socket=...]" 691 "[,file.debug=N]" 692 "[,file.logfile=/path/filename.log]\n"); 693 return ret; 694 } 695 } else { 696 ret = qemu_gluster_parse_json(gconf, options, errp); 697 if (ret < 0) { 698 error_append_hint(errp, "Usage: " 699 "-drive driver=qcow2,file.driver=gluster," 700 "file.volume=testvol,file.path=/path/a.qcow2" 701 "[,file.debug=9]" 702 "[,file.logfile=/path/filename.log]," 703 "file.server.0.type=inet," 704 "file.server.0.host=1.2.3.4," 705 "file.server.0.port=24007," 706 "file.server.1.transport=unix," 707 "file.server.1.path=/var/run/glusterd.socket ..." 708 "\n"); 709 return ret; 710 } 711 } 712 713 return 0; 714 } 715 716 static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf, 717 const char *filename, 718 QDict *options, Error **errp) 719 { 720 int ret; 721 722 ret = qemu_gluster_parse(gconf, filename, options, errp); 723 if (ret < 0) { 724 errno = -ret; 725 return NULL; 726 } 727 728 return qemu_gluster_glfs_init(gconf, errp); 729 } 730 731 /* 732 * AIO callback routine called from GlusterFS thread. 733 */ 734 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, 735 #ifdef CONFIG_GLUSTERFS_IOCB_HAS_STAT 736 struct glfs_stat *pre, struct glfs_stat *post, 737 #endif 738 void *arg) 739 { 740 GlusterAIOCB *acb = (GlusterAIOCB *)arg; 741 742 if (!ret || ret == acb->size) { 743 acb->ret = 0; /* Success */ 744 } else if (ret < 0) { 745 acb->ret = -errno; /* Read/Write failed */ 746 } else { 747 acb->ret = -EIO; /* Partial read/write - fail it */ 748 } 749 750 aio_co_schedule(acb->aio_context, acb->coroutine); 751 } 752 753 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags) 754 { 755 assert(open_flags != NULL); 756 757 *open_flags |= O_BINARY; 758 759 if (bdrv_flags & BDRV_O_RDWR) { 760 *open_flags |= O_RDWR; 761 } else { 762 *open_flags |= O_RDONLY; 763 } 764 765 if ((bdrv_flags & BDRV_O_NOCACHE)) { 766 *open_flags |= O_DIRECT; 767 } 768 } 769 770 /* 771 * Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of 772 * gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used. 773 * - Corrected versions return -1 and set errno to EINVAL. 774 * - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set 775 * errno to ENXIO when SEEK_DATA is called with a position of EOF. 776 */ 777 static bool qemu_gluster_test_seek(struct glfs_fd *fd) 778 { 779 off_t ret = 0; 780 781 #if defined SEEK_HOLE && defined SEEK_DATA 782 off_t eof; 783 784 eof = glfs_lseek(fd, 0, SEEK_END); 785 if (eof < 0) { 786 /* this should never occur */ 787 return false; 788 } 789 790 /* this should always fail with ENXIO if SEEK_DATA is supported */ 791 ret = glfs_lseek(fd, eof, SEEK_DATA); 792 #endif 793 794 return (ret < 0) && (errno == ENXIO); 795 } 796 797 static int qemu_gluster_open(BlockDriverState *bs, QDict *options, 798 int bdrv_flags, Error **errp) 799 { 800 BDRVGlusterState *s = bs->opaque; 801 int open_flags = 0; 802 int ret = 0; 803 BlockdevOptionsGluster *gconf = NULL; 804 QemuOpts *opts; 805 const char *filename, *logfile; 806 807 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 808 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 809 ret = -EINVAL; 810 goto out; 811 } 812 813 filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME); 814 815 s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG, 816 GLUSTER_DEBUG_DEFAULT); 817 if (s->debug < 0) { 818 s->debug = 0; 819 } else if (s->debug > GLUSTER_DEBUG_MAX) { 820 s->debug = GLUSTER_DEBUG_MAX; 821 } 822 823 gconf = g_new0(BlockdevOptionsGluster, 1); 824 gconf->debug = s->debug; 825 gconf->has_debug = true; 826 827 logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE); 828 s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT); 829 830 gconf->logfile = g_strdup(s->logfile); 831 832 s->glfs = qemu_gluster_init(gconf, filename, options, errp); 833 if (!s->glfs) { 834 ret = -errno; 835 goto out; 836 } 837 838 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT 839 /* Without this, if fsync fails for a recoverable reason (for instance, 840 * ENOSPC), gluster will dump its cache, preventing retries. This means 841 * almost certain data loss. Not all gluster versions support the 842 * 'resync-failed-syncs-after-fsync' key value, but there is no way to 843 * discover during runtime if it is supported (this api returns success for 844 * unknown key/value pairs) */ 845 ret = glfs_set_xlator_option(s->glfs, "*-write-behind", 846 "resync-failed-syncs-after-fsync", 847 "on"); 848 if (ret < 0) { 849 error_setg_errno(errp, errno, "Unable to set xlator key/value pair"); 850 ret = -errno; 851 goto out; 852 } 853 #endif 854 855 qemu_gluster_parse_flags(bdrv_flags, &open_flags); 856 857 s->fd = glfs_open(s->glfs, gconf->path, open_flags); 858 ret = s->fd ? 0 : -errno; 859 860 if (ret == -EACCES || ret == -EROFS) { 861 /* Try to degrade to read-only, but if it doesn't work, still use the 862 * normal error message. */ 863 bdrv_graph_rdlock_main_loop(); 864 if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) { 865 open_flags = (open_flags & ~O_RDWR) | O_RDONLY; 866 s->fd = glfs_open(s->glfs, gconf->path, open_flags); 867 ret = s->fd ? 0 : -errno; 868 } 869 bdrv_graph_rdunlock_main_loop(); 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 void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp) 891 { 892 bs->bl.max_transfer = GLUSTER_MAX_TRANSFER; 893 bs->bl.max_pdiscard = MIN(SIZE_MAX, INT64_MAX); 894 } 895 896 static int qemu_gluster_reopen_prepare(BDRVReopenState *state, 897 BlockReopenQueue *queue, Error **errp) 898 { 899 int ret = 0; 900 BDRVGlusterState *s; 901 BDRVGlusterReopenState *reop_s; 902 BlockdevOptionsGluster *gconf; 903 int open_flags = 0; 904 905 assert(state != NULL); 906 assert(state->bs != NULL); 907 908 s = state->bs->opaque; 909 910 state->opaque = g_new0(BDRVGlusterReopenState, 1); 911 reop_s = state->opaque; 912 913 qemu_gluster_parse_flags(state->flags, &open_flags); 914 915 gconf = g_new0(BlockdevOptionsGluster, 1); 916 gconf->debug = s->debug; 917 gconf->has_debug = true; 918 gconf->logfile = g_strdup(s->logfile); 919 920 /* 921 * If 'state->bs->exact_filename' is empty, 'state->options' should contain 922 * the JSON parameters already parsed. 923 */ 924 if (state->bs->exact_filename[0] != '\0') { 925 reop_s->glfs = qemu_gluster_init(gconf, state->bs->exact_filename, NULL, 926 errp); 927 } else { 928 reop_s->glfs = qemu_gluster_init(gconf, NULL, state->options, errp); 929 } 930 if (reop_s->glfs == NULL) { 931 ret = -errno; 932 goto exit; 933 } 934 935 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT 936 ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind", 937 "resync-failed-syncs-after-fsync", "on"); 938 if (ret < 0) { 939 error_setg_errno(errp, errno, "Unable to set xlator key/value pair"); 940 ret = -errno; 941 goto exit; 942 } 943 #endif 944 945 reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags); 946 if (reop_s->fd == NULL) { 947 /* reops->glfs will be cleaned up in _abort */ 948 ret = -errno; 949 goto exit; 950 } 951 952 exit: 953 /* state->opaque will be freed in either the _abort or _commit */ 954 qapi_free_BlockdevOptionsGluster(gconf); 955 return ret; 956 } 957 958 static void qemu_gluster_reopen_commit(BDRVReopenState *state) 959 { 960 BDRVGlusterReopenState *reop_s = state->opaque; 961 BDRVGlusterState *s = state->bs->opaque; 962 963 964 /* close the old */ 965 if (s->fd) { 966 glfs_close(s->fd); 967 } 968 969 glfs_clear_preopened(s->glfs); 970 971 /* use the newly opened image / connection */ 972 s->fd = reop_s->fd; 973 s->glfs = reop_s->glfs; 974 975 g_free(state->opaque); 976 state->opaque = NULL; 977 978 return; 979 } 980 981 982 static void qemu_gluster_reopen_abort(BDRVReopenState *state) 983 { 984 BDRVGlusterReopenState *reop_s = state->opaque; 985 986 if (reop_s == NULL) { 987 return; 988 } 989 990 if (reop_s->fd) { 991 glfs_close(reop_s->fd); 992 } 993 994 glfs_clear_preopened(reop_s->glfs); 995 996 g_free(state->opaque); 997 state->opaque = NULL; 998 999 return; 1000 } 1001 1002 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1003 static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs, 1004 int64_t offset, 1005 int64_t bytes, 1006 BdrvRequestFlags flags) 1007 { 1008 int ret; 1009 GlusterAIOCB acb; 1010 BDRVGlusterState *s = bs->opaque; 1011 1012 acb.size = bytes; 1013 acb.ret = 0; 1014 acb.coroutine = qemu_coroutine_self(); 1015 acb.aio_context = bdrv_get_aio_context(bs); 1016 1017 ret = glfs_zerofill_async(s->fd, offset, bytes, gluster_finish_aiocb, &acb); 1018 if (ret < 0) { 1019 return -errno; 1020 } 1021 1022 qemu_coroutine_yield(); 1023 return acb.ret; 1024 } 1025 #endif 1026 1027 static int qemu_gluster_do_truncate(struct glfs_fd *fd, int64_t offset, 1028 PreallocMode prealloc, Error **errp) 1029 { 1030 int64_t current_length; 1031 1032 current_length = glfs_lseek(fd, 0, SEEK_END); 1033 if (current_length < 0) { 1034 error_setg_errno(errp, errno, "Failed to determine current size"); 1035 return -errno; 1036 } 1037 1038 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) { 1039 error_setg(errp, "Cannot use preallocation for shrinking files"); 1040 return -ENOTSUP; 1041 } 1042 1043 if (current_length == offset) { 1044 return 0; 1045 } 1046 1047 switch (prealloc) { 1048 #ifdef CONFIG_GLUSTERFS_FALLOCATE 1049 case PREALLOC_MODE_FALLOC: 1050 if (glfs_fallocate(fd, 0, current_length, offset - current_length)) { 1051 error_setg_errno(errp, errno, "Could not preallocate data"); 1052 return -errno; 1053 } 1054 break; 1055 #endif /* CONFIG_GLUSTERFS_FALLOCATE */ 1056 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1057 case PREALLOC_MODE_FULL: 1058 if (glfs_ftruncate(fd, offset)) { 1059 error_setg_errno(errp, errno, "Could not resize file"); 1060 return -errno; 1061 } 1062 if (glfs_zerofill(fd, current_length, offset - current_length)) { 1063 error_setg_errno(errp, errno, "Could not zerofill the new area"); 1064 return -errno; 1065 } 1066 break; 1067 #endif /* CONFIG_GLUSTERFS_ZEROFILL */ 1068 case PREALLOC_MODE_OFF: 1069 if (glfs_ftruncate(fd, offset)) { 1070 error_setg_errno(errp, errno, "Could not resize file"); 1071 return -errno; 1072 } 1073 break; 1074 default: 1075 error_setg(errp, "Unsupported preallocation mode: %s", 1076 PreallocMode_str(prealloc)); 1077 return -EINVAL; 1078 } 1079 1080 return 0; 1081 } 1082 1083 static int qemu_gluster_co_create(BlockdevCreateOptions *options, 1084 Error **errp) 1085 { 1086 BlockdevCreateOptionsGluster *opts = &options->u.gluster; 1087 struct glfs *glfs; 1088 struct glfs_fd *fd = NULL; 1089 int ret = 0; 1090 1091 assert(options->driver == BLOCKDEV_DRIVER_GLUSTER); 1092 1093 glfs = qemu_gluster_glfs_init(opts->location, errp); 1094 if (!glfs) { 1095 ret = -errno; 1096 goto out; 1097 } 1098 1099 fd = glfs_creat(glfs, opts->location->path, 1100 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR); 1101 if (!fd) { 1102 ret = -errno; 1103 goto out; 1104 } 1105 1106 ret = qemu_gluster_do_truncate(fd, opts->size, opts->preallocation, errp); 1107 1108 out: 1109 if (fd) { 1110 if (glfs_close(fd) != 0 && ret == 0) { 1111 ret = -errno; 1112 } 1113 } 1114 glfs_clear_preopened(glfs); 1115 return ret; 1116 } 1117 1118 static int coroutine_fn qemu_gluster_co_create_opts(BlockDriver *drv, 1119 const char *filename, 1120 QemuOpts *opts, 1121 Error **errp) 1122 { 1123 BlockdevCreateOptions *options; 1124 BlockdevCreateOptionsGluster *gopts; 1125 BlockdevOptionsGluster *gconf; 1126 char *tmp = NULL; 1127 Error *local_err = NULL; 1128 int ret; 1129 1130 options = g_new0(BlockdevCreateOptions, 1); 1131 options->driver = BLOCKDEV_DRIVER_GLUSTER; 1132 gopts = &options->u.gluster; 1133 1134 gconf = g_new0(BlockdevOptionsGluster, 1); 1135 gopts->location = gconf; 1136 1137 gopts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1138 BDRV_SECTOR_SIZE); 1139 1140 tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); 1141 gopts->preallocation = qapi_enum_parse(&PreallocMode_lookup, tmp, 1142 PREALLOC_MODE_OFF, &local_err); 1143 g_free(tmp); 1144 if (local_err) { 1145 error_propagate(errp, local_err); 1146 ret = -EINVAL; 1147 goto fail; 1148 } 1149 1150 gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG, 1151 GLUSTER_DEBUG_DEFAULT); 1152 if (gconf->debug < 0) { 1153 gconf->debug = 0; 1154 } else if (gconf->debug > GLUSTER_DEBUG_MAX) { 1155 gconf->debug = GLUSTER_DEBUG_MAX; 1156 } 1157 gconf->has_debug = true; 1158 1159 gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE); 1160 if (!gconf->logfile) { 1161 gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT); 1162 } 1163 1164 ret = qemu_gluster_parse(gconf, filename, NULL, errp); 1165 if (ret < 0) { 1166 goto fail; 1167 } 1168 1169 ret = qemu_gluster_co_create(options, errp); 1170 if (ret < 0) { 1171 goto fail; 1172 } 1173 1174 ret = 0; 1175 fail: 1176 qapi_free_BlockdevCreateOptions(options); 1177 return ret; 1178 } 1179 1180 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs, 1181 int64_t sector_num, int nb_sectors, 1182 QEMUIOVector *qiov, int write) 1183 { 1184 int ret; 1185 GlusterAIOCB acb; 1186 BDRVGlusterState *s = bs->opaque; 1187 size_t size = nb_sectors * BDRV_SECTOR_SIZE; 1188 off_t offset = sector_num * BDRV_SECTOR_SIZE; 1189 1190 acb.size = size; 1191 acb.ret = 0; 1192 acb.coroutine = qemu_coroutine_self(); 1193 acb.aio_context = bdrv_get_aio_context(bs); 1194 1195 if (write) { 1196 ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0, 1197 gluster_finish_aiocb, &acb); 1198 } else { 1199 ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0, 1200 gluster_finish_aiocb, &acb); 1201 } 1202 1203 if (ret < 0) { 1204 return -errno; 1205 } 1206 1207 qemu_coroutine_yield(); 1208 return acb.ret; 1209 } 1210 1211 static coroutine_fn int qemu_gluster_co_truncate(BlockDriverState *bs, 1212 int64_t offset, 1213 bool exact, 1214 PreallocMode prealloc, 1215 BdrvRequestFlags flags, 1216 Error **errp) 1217 { 1218 BDRVGlusterState *s = bs->opaque; 1219 return qemu_gluster_do_truncate(s->fd, offset, prealloc, errp); 1220 } 1221 1222 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs, 1223 int64_t sector_num, 1224 int nb_sectors, 1225 QEMUIOVector *qiov) 1226 { 1227 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0); 1228 } 1229 1230 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs, 1231 int64_t sector_num, 1232 int nb_sectors, 1233 QEMUIOVector *qiov, 1234 int flags) 1235 { 1236 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1); 1237 } 1238 1239 static void qemu_gluster_close(BlockDriverState *bs) 1240 { 1241 BDRVGlusterState *s = bs->opaque; 1242 1243 g_free(s->logfile); 1244 if (s->fd) { 1245 glfs_close(s->fd); 1246 s->fd = NULL; 1247 } 1248 glfs_clear_preopened(s->glfs); 1249 } 1250 1251 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs) 1252 { 1253 int ret; 1254 GlusterAIOCB acb; 1255 BDRVGlusterState *s = bs->opaque; 1256 1257 acb.size = 0; 1258 acb.ret = 0; 1259 acb.coroutine = qemu_coroutine_self(); 1260 acb.aio_context = bdrv_get_aio_context(bs); 1261 1262 ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb); 1263 if (ret < 0) { 1264 ret = -errno; 1265 goto error; 1266 } 1267 1268 qemu_coroutine_yield(); 1269 if (acb.ret < 0) { 1270 ret = acb.ret; 1271 goto error; 1272 } 1273 1274 return acb.ret; 1275 1276 error: 1277 /* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache 1278 * after a fsync failure, so we have no way of allowing the guest to safely 1279 * continue. Gluster versions prior to 3.5.6 don't retain the cache 1280 * either, but will invalidate the fd on error, so this is again our only 1281 * option. 1282 * 1283 * The 'resync-failed-syncs-after-fsync' xlator option for the 1284 * write-behind cache will cause later gluster versions to retain its 1285 * cache after error, so long as the fd remains open. However, we 1286 * currently have no way of knowing if this option is supported. 1287 * 1288 * TODO: Once gluster provides a way for us to determine if the option 1289 * is supported, bypass the closure and setting drv to NULL. */ 1290 qemu_gluster_close(bs); 1291 bs->drv = NULL; 1292 return ret; 1293 } 1294 1295 #ifdef CONFIG_GLUSTERFS_DISCARD 1296 static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs, 1297 int64_t offset, int64_t bytes) 1298 { 1299 int ret; 1300 GlusterAIOCB acb; 1301 BDRVGlusterState *s = bs->opaque; 1302 1303 assert(bytes <= SIZE_MAX); /* rely on max_pdiscard */ 1304 1305 acb.size = 0; 1306 acb.ret = 0; 1307 acb.coroutine = qemu_coroutine_self(); 1308 acb.aio_context = bdrv_get_aio_context(bs); 1309 1310 ret = glfs_discard_async(s->fd, offset, bytes, gluster_finish_aiocb, &acb); 1311 if (ret < 0) { 1312 return -errno; 1313 } 1314 1315 qemu_coroutine_yield(); 1316 return acb.ret; 1317 } 1318 #endif 1319 1320 static int64_t coroutine_fn qemu_gluster_co_getlength(BlockDriverState *bs) 1321 { 1322 BDRVGlusterState *s = bs->opaque; 1323 int64_t ret; 1324 1325 ret = glfs_lseek(s->fd, 0, SEEK_END); 1326 if (ret < 0) { 1327 return -errno; 1328 } else { 1329 return ret; 1330 } 1331 } 1332 1333 static int64_t coroutine_fn 1334 qemu_gluster_co_get_allocated_file_size(BlockDriverState *bs) 1335 { 1336 BDRVGlusterState *s = bs->opaque; 1337 struct stat st; 1338 int ret; 1339 1340 ret = glfs_fstat(s->fd, &st); 1341 if (ret < 0) { 1342 return -errno; 1343 } else { 1344 return st.st_blocks * 512; 1345 } 1346 } 1347 1348 /* 1349 * Find allocation range in @bs around offset @start. 1350 * May change underlying file descriptor's file offset. 1351 * If @start is not in a hole, store @start in @data, and the 1352 * beginning of the next hole in @hole, and return 0. 1353 * If @start is in a non-trailing hole, store @start in @hole and the 1354 * beginning of the next non-hole in @data, and return 0. 1355 * If @start is in a trailing hole or beyond EOF, return -ENXIO. 1356 * If we can't find out, return a negative errno other than -ENXIO. 1357 * 1358 * (Shamefully copied from file-posix.c, only minuscule adaptions.) 1359 */ 1360 static int find_allocation(BlockDriverState *bs, off_t start, 1361 off_t *data, off_t *hole) 1362 { 1363 BDRVGlusterState *s = bs->opaque; 1364 1365 if (!s->supports_seek_data) { 1366 goto exit; 1367 } 1368 1369 #if defined SEEK_HOLE && defined SEEK_DATA 1370 off_t offs; 1371 1372 /* 1373 * SEEK_DATA cases: 1374 * D1. offs == start: start is in data 1375 * D2. offs > start: start is in a hole, next data at offs 1376 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole 1377 * or start is beyond EOF 1378 * If the latter happens, the file has been truncated behind 1379 * our back since we opened it. All bets are off then. 1380 * Treating like a trailing hole is simplest. 1381 * D4. offs < 0, errno != ENXIO: we learned nothing 1382 */ 1383 offs = glfs_lseek(s->fd, start, SEEK_DATA); 1384 if (offs < 0) { 1385 return -errno; /* D3 or D4 */ 1386 } 1387 1388 if (offs < start) { 1389 /* This is not a valid return by lseek(). We are safe to just return 1390 * -EIO in this case, and we'll treat it like D4. Unfortunately some 1391 * versions of gluster server will return offs < start, so an assert 1392 * here will unnecessarily abort QEMU. */ 1393 return -EIO; 1394 } 1395 1396 if (offs > start) { 1397 /* D2: in hole, next data at offs */ 1398 *hole = start; 1399 *data = offs; 1400 return 0; 1401 } 1402 1403 /* D1: in data, end not yet known */ 1404 1405 /* 1406 * SEEK_HOLE cases: 1407 * H1. offs == start: start is in a hole 1408 * If this happens here, a hole has been dug behind our back 1409 * since the previous lseek(). 1410 * H2. offs > start: either start is in data, next hole at offs, 1411 * or start is in trailing hole, EOF at offs 1412 * Linux treats trailing holes like any other hole: offs == 1413 * start. Solaris seeks to EOF instead: offs > start (blech). 1414 * If that happens here, a hole has been dug behind our back 1415 * since the previous lseek(). 1416 * H3. offs < 0, errno = ENXIO: start is beyond EOF 1417 * If this happens, the file has been truncated behind our 1418 * back since we opened it. Treat it like a trailing hole. 1419 * H4. offs < 0, errno != ENXIO: we learned nothing 1420 * Pretend we know nothing at all, i.e. "forget" about D1. 1421 */ 1422 offs = glfs_lseek(s->fd, start, SEEK_HOLE); 1423 if (offs < 0) { 1424 return -errno; /* D1 and (H3 or H4) */ 1425 } 1426 1427 if (offs < start) { 1428 /* This is not a valid return by lseek(). We are safe to just return 1429 * -EIO in this case, and we'll treat it like H4. Unfortunately some 1430 * versions of gluster server will return offs < start, so an assert 1431 * here will unnecessarily abort QEMU. */ 1432 return -EIO; 1433 } 1434 1435 if (offs > start) { 1436 /* 1437 * D1 and H2: either in data, next hole at offs, or it was in 1438 * data but is now in a trailing hole. In the latter case, 1439 * all bets are off. Treating it as if it there was data all 1440 * the way to EOF is safe, so simply do that. 1441 */ 1442 *data = start; 1443 *hole = offs; 1444 return 0; 1445 } 1446 1447 /* D1 and H1 */ 1448 return -EBUSY; 1449 #endif 1450 1451 exit: 1452 return -ENOTSUP; 1453 } 1454 1455 /* 1456 * Returns the allocation status of the specified offset. 1457 * 1458 * The block layer guarantees 'offset' and 'bytes' are within bounds. 1459 * 1460 * 'pnum' is set to the number of bytes (including and immediately following 1461 * the specified offset) that are known to be in the same 1462 * allocated/unallocated state. 1463 * 1464 * 'bytes' is a soft cap for 'pnum'. If the information is free, 'pnum' may 1465 * well exceed it. 1466 * 1467 * (Based on raw_co_block_status() from file-posix.c.) 1468 */ 1469 static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs, 1470 bool want_zero, 1471 int64_t offset, 1472 int64_t bytes, 1473 int64_t *pnum, 1474 int64_t *map, 1475 BlockDriverState **file) 1476 { 1477 BDRVGlusterState *s = bs->opaque; 1478 off_t data = 0, hole = 0; 1479 int ret = -EINVAL; 1480 1481 assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment)); 1482 1483 if (!s->fd) { 1484 return ret; 1485 } 1486 1487 if (!want_zero) { 1488 *pnum = bytes; 1489 *map = offset; 1490 *file = bs; 1491 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 1492 } 1493 1494 ret = find_allocation(bs, offset, &data, &hole); 1495 if (ret == -ENXIO) { 1496 /* Trailing hole */ 1497 *pnum = bytes; 1498 ret = BDRV_BLOCK_ZERO; 1499 } else if (ret < 0) { 1500 /* No info available, so pretend there are no holes */ 1501 *pnum = bytes; 1502 ret = BDRV_BLOCK_DATA; 1503 } else if (data == offset) { 1504 /* On a data extent, compute bytes to the end of the extent, 1505 * possibly including a partial sector at EOF. */ 1506 *pnum = hole - offset; 1507 1508 /* 1509 * We are not allowed to return partial sectors, though, so 1510 * round up if necessary. 1511 */ 1512 if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) { 1513 int64_t file_length = qemu_gluster_co_getlength(bs); 1514 if (file_length > 0) { 1515 /* Ignore errors, this is just a safeguard */ 1516 assert(hole == file_length); 1517 } 1518 *pnum = ROUND_UP(*pnum, bs->bl.request_alignment); 1519 } 1520 1521 ret = BDRV_BLOCK_DATA; 1522 } else { 1523 /* On a hole, compute bytes to the beginning of the next extent. */ 1524 assert(hole == offset); 1525 *pnum = data - offset; 1526 ret = BDRV_BLOCK_ZERO; 1527 } 1528 1529 *map = offset; 1530 *file = bs; 1531 1532 return ret | BDRV_BLOCK_OFFSET_VALID; 1533 } 1534 1535 1536 static const char *const gluster_strong_open_opts[] = { 1537 GLUSTER_OPT_VOLUME, 1538 GLUSTER_OPT_PATH, 1539 GLUSTER_OPT_TYPE, 1540 GLUSTER_OPT_SERVER_PATTERN, 1541 GLUSTER_OPT_HOST, 1542 GLUSTER_OPT_PORT, 1543 GLUSTER_OPT_TO, 1544 GLUSTER_OPT_IPV4, 1545 GLUSTER_OPT_IPV6, 1546 GLUSTER_OPT_SOCKET, 1547 1548 NULL 1549 }; 1550 1551 static BlockDriver bdrv_gluster = { 1552 .format_name = "gluster", 1553 .protocol_name = "gluster", 1554 .instance_size = sizeof(BDRVGlusterState), 1555 .bdrv_file_open = qemu_gluster_open, 1556 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1557 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1558 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1559 .bdrv_close = qemu_gluster_close, 1560 .bdrv_co_create = qemu_gluster_co_create, 1561 .bdrv_co_create_opts = qemu_gluster_co_create_opts, 1562 .bdrv_co_getlength = qemu_gluster_co_getlength, 1563 .bdrv_co_get_allocated_file_size = qemu_gluster_co_get_allocated_file_size, 1564 .bdrv_co_truncate = qemu_gluster_co_truncate, 1565 .bdrv_co_readv = qemu_gluster_co_readv, 1566 .bdrv_co_writev = qemu_gluster_co_writev, 1567 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1568 #ifdef CONFIG_GLUSTERFS_DISCARD 1569 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1570 #endif 1571 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1572 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1573 #endif 1574 .bdrv_co_block_status = qemu_gluster_co_block_status, 1575 .bdrv_refresh_limits = qemu_gluster_refresh_limits, 1576 .create_opts = &qemu_gluster_create_opts, 1577 .strong_runtime_opts = gluster_strong_open_opts, 1578 }; 1579 1580 static BlockDriver bdrv_gluster_tcp = { 1581 .format_name = "gluster", 1582 .protocol_name = "gluster+tcp", 1583 .instance_size = sizeof(BDRVGlusterState), 1584 .bdrv_file_open = qemu_gluster_open, 1585 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1586 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1587 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1588 .bdrv_close = qemu_gluster_close, 1589 .bdrv_co_create = qemu_gluster_co_create, 1590 .bdrv_co_create_opts = qemu_gluster_co_create_opts, 1591 .bdrv_co_getlength = qemu_gluster_co_getlength, 1592 .bdrv_co_get_allocated_file_size = qemu_gluster_co_get_allocated_file_size, 1593 .bdrv_co_truncate = qemu_gluster_co_truncate, 1594 .bdrv_co_readv = qemu_gluster_co_readv, 1595 .bdrv_co_writev = qemu_gluster_co_writev, 1596 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1597 #ifdef CONFIG_GLUSTERFS_DISCARD 1598 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1599 #endif 1600 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1601 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1602 #endif 1603 .bdrv_co_block_status = qemu_gluster_co_block_status, 1604 .bdrv_refresh_limits = qemu_gluster_refresh_limits, 1605 .create_opts = &qemu_gluster_create_opts, 1606 .strong_runtime_opts = gluster_strong_open_opts, 1607 }; 1608 1609 static BlockDriver bdrv_gluster_unix = { 1610 .format_name = "gluster", 1611 .protocol_name = "gluster+unix", 1612 .instance_size = sizeof(BDRVGlusterState), 1613 .bdrv_file_open = qemu_gluster_open, 1614 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare, 1615 .bdrv_reopen_commit = qemu_gluster_reopen_commit, 1616 .bdrv_reopen_abort = qemu_gluster_reopen_abort, 1617 .bdrv_close = qemu_gluster_close, 1618 .bdrv_co_create = qemu_gluster_co_create, 1619 .bdrv_co_create_opts = qemu_gluster_co_create_opts, 1620 .bdrv_co_getlength = qemu_gluster_co_getlength, 1621 .bdrv_co_get_allocated_file_size = qemu_gluster_co_get_allocated_file_size, 1622 .bdrv_co_truncate = qemu_gluster_co_truncate, 1623 .bdrv_co_readv = qemu_gluster_co_readv, 1624 .bdrv_co_writev = qemu_gluster_co_writev, 1625 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk, 1626 #ifdef CONFIG_GLUSTERFS_DISCARD 1627 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard, 1628 #endif 1629 #ifdef CONFIG_GLUSTERFS_ZEROFILL 1630 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes, 1631 #endif 1632 .bdrv_co_block_status = qemu_gluster_co_block_status, 1633 .bdrv_refresh_limits = qemu_gluster_refresh_limits, 1634 .create_opts = &qemu_gluster_create_opts, 1635 .strong_runtime_opts = gluster_strong_open_opts, 1636 }; 1637 1638 static void bdrv_gluster_init(void) 1639 { 1640 bdrv_register(&bdrv_gluster_unix); 1641 bdrv_register(&bdrv_gluster_tcp); 1642 bdrv_register(&bdrv_gluster); 1643 } 1644 1645 block_init(bdrv_gluster_init); 1646