1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2013 by Delphix. All rights reserved. 24 * Copyright (c) 2013 Steven Hartland. All rights reserved. 25 */ 26 27 /* 28 * zhack is a debugging tool that can write changes to ZFS pool using libzpool 29 * for testing purposes. Altering pools with zhack is unsupported and may 30 * result in corrupted pools. 31 */ 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <ctype.h> 36 #include <sys/zfs_context.h> 37 #include <sys/spa.h> 38 #include <sys/spa_impl.h> 39 #include <sys/dmu.h> 40 #include <sys/zap.h> 41 #include <sys/zfs_znode.h> 42 #include <sys/dsl_synctask.h> 43 #include <sys/vdev.h> 44 #include <sys/fs/zfs.h> 45 #include <sys/dmu_objset.h> 46 #include <sys/dsl_pool.h> 47 #include <sys/zio_checksum.h> 48 #include <sys/zio_compress.h> 49 #include <sys/zfeature.h> 50 #include <sys/dmu_tx.h> 51 #undef ZFS_MAXNAMELEN 52 #undef verify 53 #include <libzfs.h> 54 55 extern boolean_t zfeature_checks_disable; 56 57 const char cmdname[] = "zhack"; 58 libzfs_handle_t *g_zfs; 59 static importargs_t g_importargs; 60 static char *g_pool; 61 static boolean_t g_readonly; 62 63 static void 64 usage(void) 65 { 66 (void) fprintf(stderr, 67 "Usage: %s [-c cachefile] [-d dir] <subcommand> <args> ...\n" 68 "where <subcommand> <args> is one of the following:\n" 69 "\n", cmdname); 70 71 (void) fprintf(stderr, 72 " feature stat <pool>\n" 73 " print information about enabled features\n" 74 " feature enable [-d desc] <pool> <feature>\n" 75 " add a new enabled feature to the pool\n" 76 " -d <desc> sets the feature's description\n" 77 " feature ref [-md] <pool> <feature>\n" 78 " change the refcount on the given feature\n" 79 " -d decrease instead of increase the refcount\n" 80 " -m add the feature to the label if increasing refcount\n" 81 "\n" 82 " <feature> : should be a feature guid\n"); 83 exit(1); 84 } 85 86 87 static void 88 fatal(spa_t *spa, void *tag, const char *fmt, ...) 89 { 90 va_list ap; 91 92 if (spa != NULL) { 93 spa_close(spa, tag); 94 (void) spa_export(g_pool, NULL, B_TRUE, B_FALSE); 95 } 96 97 va_start(ap, fmt); 98 (void) fprintf(stderr, "%s: ", cmdname); 99 (void) vfprintf(stderr, fmt, ap); 100 va_end(ap); 101 (void) fprintf(stderr, "\n"); 102 103 exit(1); 104 } 105 106 /* ARGSUSED */ 107 static int 108 space_delta_cb(dmu_object_type_t bonustype, void *data, 109 uint64_t *userp, uint64_t *groupp) 110 { 111 /* 112 * Is it a valid type of object to track? 113 */ 114 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA) 115 return (ENOENT); 116 (void) fprintf(stderr, "modifying object that needs user accounting"); 117 abort(); 118 /* NOTREACHED */ 119 } 120 121 /* 122 * Target is the dataset whose pool we want to open. 123 */ 124 static void 125 import_pool(const char *target, boolean_t readonly) 126 { 127 nvlist_t *config; 128 nvlist_t *pools; 129 int error; 130 char *sepp; 131 spa_t *spa; 132 nvpair_t *elem; 133 nvlist_t *props; 134 const char *name; 135 136 kernel_init(readonly ? FREAD : (FREAD | FWRITE)); 137 g_zfs = libzfs_init(); 138 ASSERT(g_zfs != NULL); 139 140 dmu_objset_register_type(DMU_OST_ZFS, space_delta_cb); 141 142 g_readonly = readonly; 143 144 /* 145 * If we only want readonly access, it's OK if we find 146 * a potentially-active (ie, imported into the kernel) pool from the 147 * default cachefile. 148 */ 149 if (readonly && spa_open(target, &spa, FTAG) == 0) { 150 spa_close(spa, FTAG); 151 return; 152 } 153 154 g_importargs.unique = B_TRUE; 155 g_importargs.can_be_active = readonly; 156 g_pool = strdup(target); 157 if ((sepp = strpbrk(g_pool, "/@")) != NULL) 158 *sepp = '\0'; 159 g_importargs.poolname = g_pool; 160 pools = zpool_search_import(g_zfs, &g_importargs); 161 162 if (nvlist_empty(pools)) { 163 if (!g_importargs.can_be_active) { 164 g_importargs.can_be_active = B_TRUE; 165 if (zpool_search_import(g_zfs, &g_importargs) != NULL || 166 spa_open(target, &spa, FTAG) == 0) { 167 fatal(spa, FTAG, "cannot import '%s': pool is " 168 "active; run " "\"zpool export %s\" " 169 "first\n", g_pool, g_pool); 170 } 171 } 172 173 fatal(NULL, FTAG, "cannot import '%s': no such pool " 174 "available\n", g_pool); 175 } 176 177 elem = nvlist_next_nvpair(pools, NULL); 178 name = nvpair_name(elem); 179 verify(nvpair_value_nvlist(elem, &config) == 0); 180 181 props = NULL; 182 if (readonly) { 183 verify(nvlist_alloc(&props, NV_UNIQUE_NAME, 0) == 0); 184 verify(nvlist_add_uint64(props, 185 zpool_prop_to_name(ZPOOL_PROP_READONLY), 1) == 0); 186 } 187 188 zfeature_checks_disable = B_TRUE; 189 error = spa_import(name, config, props, ZFS_IMPORT_NORMAL); 190 zfeature_checks_disable = B_FALSE; 191 if (error == EEXIST) 192 error = 0; 193 194 if (error) 195 fatal(NULL, FTAG, "can't import '%s': %s", name, 196 strerror(error)); 197 } 198 199 static void 200 zhack_spa_open(const char *target, boolean_t readonly, void *tag, spa_t **spa) 201 { 202 int err; 203 204 import_pool(target, readonly); 205 206 zfeature_checks_disable = B_TRUE; 207 err = spa_open(target, spa, tag); 208 zfeature_checks_disable = B_FALSE; 209 210 if (err != 0) 211 fatal(*spa, FTAG, "cannot open '%s': %s", target, 212 strerror(err)); 213 if (spa_version(*spa) < SPA_VERSION_FEATURES) { 214 fatal(*spa, FTAG, "'%s' has version %d, features not enabled", 215 target, (int)spa_version(*spa)); 216 } 217 } 218 219 static void 220 dump_obj(objset_t *os, uint64_t obj, const char *name) 221 { 222 zap_cursor_t zc; 223 zap_attribute_t za; 224 225 (void) printf("%s_obj:\n", name); 226 227 for (zap_cursor_init(&zc, os, obj); 228 zap_cursor_retrieve(&zc, &za) == 0; 229 zap_cursor_advance(&zc)) { 230 if (za.za_integer_length == 8) { 231 ASSERT(za.za_num_integers == 1); 232 (void) printf("\t%s = %llu\n", 233 za.za_name, (u_longlong_t)za.za_first_integer); 234 } else { 235 ASSERT(za.za_integer_length == 1); 236 char val[1024]; 237 VERIFY(zap_lookup(os, obj, za.za_name, 238 1, sizeof (val), val) == 0); 239 (void) printf("\t%s = %s\n", za.za_name, val); 240 } 241 } 242 zap_cursor_fini(&zc); 243 } 244 245 static void 246 dump_mos(spa_t *spa) 247 { 248 nvlist_t *nv = spa->spa_label_features; 249 250 (void) printf("label config:\n"); 251 for (nvpair_t *pair = nvlist_next_nvpair(nv, NULL); 252 pair != NULL; 253 pair = nvlist_next_nvpair(nv, pair)) { 254 (void) printf("\t%s\n", nvpair_name(pair)); 255 } 256 } 257 258 static void 259 zhack_do_feature_stat(int argc, char **argv) 260 { 261 spa_t *spa; 262 objset_t *os; 263 char *target; 264 265 argc--; 266 argv++; 267 268 if (argc < 1) { 269 (void) fprintf(stderr, "error: missing pool name\n"); 270 usage(); 271 } 272 target = argv[0]; 273 274 zhack_spa_open(target, B_TRUE, FTAG, &spa); 275 os = spa->spa_meta_objset; 276 277 dump_obj(os, spa->spa_feat_for_read_obj, "for_read"); 278 dump_obj(os, spa->spa_feat_for_write_obj, "for_write"); 279 dump_obj(os, spa->spa_feat_desc_obj, "descriptions"); 280 if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { 281 dump_obj(os, spa->spa_feat_enabled_txg_obj, "enabled_txg"); 282 } 283 dump_mos(spa); 284 285 spa_close(spa, FTAG); 286 } 287 288 static void 289 zhack_feature_enable_sync(void *arg, dmu_tx_t *tx) 290 { 291 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 292 zfeature_info_t *feature = arg; 293 294 feature_enable_sync(spa, feature, tx); 295 296 spa_history_log_internal(spa, "zhack enable feature", tx, 297 "guid=%s can_readonly=%u", 298 feature->fi_guid, feature->fi_can_readonly); 299 } 300 301 static void 302 zhack_do_feature_enable(int argc, char **argv) 303 { 304 char c; 305 char *desc, *target; 306 spa_t *spa; 307 objset_t *mos; 308 zfeature_info_t feature; 309 spa_feature_t nodeps[] = { SPA_FEATURE_NONE }; 310 311 /* 312 * Features are not added to the pool's label until their refcounts 313 * are incremented, so fi_mos can just be left as false for now. 314 */ 315 desc = NULL; 316 feature.fi_uname = "zhack"; 317 feature.fi_mos = B_FALSE; 318 feature.fi_can_readonly = B_FALSE; 319 feature.fi_activate_on_enable = B_FALSE; 320 feature.fi_depends = nodeps; 321 feature.fi_feature = SPA_FEATURE_NONE; 322 323 optind = 1; 324 while ((c = getopt(argc, argv, "rmd:")) != -1) { 325 switch (c) { 326 case 'r': 327 feature.fi_can_readonly = B_TRUE; 328 break; 329 case 'd': 330 desc = strdup(optarg); 331 break; 332 default: 333 usage(); 334 break; 335 } 336 } 337 338 if (desc == NULL) 339 desc = strdup("zhack injected"); 340 feature.fi_desc = desc; 341 342 argc -= optind; 343 argv += optind; 344 345 if (argc < 2) { 346 (void) fprintf(stderr, "error: missing feature or pool name\n"); 347 usage(); 348 } 349 target = argv[0]; 350 feature.fi_guid = argv[1]; 351 352 if (!zfeature_is_valid_guid(feature.fi_guid)) 353 fatal(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid); 354 355 zhack_spa_open(target, B_FALSE, FTAG, &spa); 356 mos = spa->spa_meta_objset; 357 358 if (zfeature_is_supported(feature.fi_guid)) 359 fatal(spa, FTAG, "'%s' is a real feature, will not enable"); 360 if (0 == zap_contains(mos, spa->spa_feat_desc_obj, feature.fi_guid)) 361 fatal(spa, FTAG, "feature already enabled: %s", 362 feature.fi_guid); 363 364 VERIFY0(dsl_sync_task(spa_name(spa), NULL, 365 zhack_feature_enable_sync, &feature, 5)); 366 367 spa_close(spa, FTAG); 368 369 free(desc); 370 } 371 372 static void 373 feature_incr_sync(void *arg, dmu_tx_t *tx) 374 { 375 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 376 zfeature_info_t *feature = arg; 377 uint64_t refcount; 378 379 VERIFY0(feature_get_refcount_from_disk(spa, feature, &refcount)); 380 feature_sync(spa, feature, refcount + 1, tx); 381 spa_history_log_internal(spa, "zhack feature incr", tx, 382 "guid=%s", feature->fi_guid); 383 } 384 385 static void 386 feature_decr_sync(void *arg, dmu_tx_t *tx) 387 { 388 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 389 zfeature_info_t *feature = arg; 390 uint64_t refcount; 391 392 VERIFY0(feature_get_refcount_from_disk(spa, feature, &refcount)); 393 feature_sync(spa, feature, refcount - 1, tx); 394 spa_history_log_internal(spa, "zhack feature decr", tx, 395 "guid=%s", feature->fi_guid); 396 } 397 398 static void 399 zhack_do_feature_ref(int argc, char **argv) 400 { 401 char c; 402 char *target; 403 boolean_t decr = B_FALSE; 404 spa_t *spa; 405 objset_t *mos; 406 zfeature_info_t feature; 407 spa_feature_t nodeps[] = { SPA_FEATURE_NONE }; 408 409 /* 410 * fi_desc does not matter here because it was written to disk 411 * when the feature was enabled, but we need to properly set the 412 * feature for read or write based on the information we read off 413 * disk later. 414 */ 415 feature.fi_uname = "zhack"; 416 feature.fi_mos = B_FALSE; 417 feature.fi_desc = NULL; 418 feature.fi_depends = nodeps; 419 feature.fi_feature = SPA_FEATURE_NONE; 420 421 optind = 1; 422 while ((c = getopt(argc, argv, "md")) != -1) { 423 switch (c) { 424 case 'm': 425 feature.fi_mos = B_TRUE; 426 break; 427 case 'd': 428 decr = B_TRUE; 429 break; 430 default: 431 usage(); 432 break; 433 } 434 } 435 argc -= optind; 436 argv += optind; 437 438 if (argc < 2) { 439 (void) fprintf(stderr, "error: missing feature or pool name\n"); 440 usage(); 441 } 442 target = argv[0]; 443 feature.fi_guid = argv[1]; 444 445 if (!zfeature_is_valid_guid(feature.fi_guid)) 446 fatal(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid); 447 448 zhack_spa_open(target, B_FALSE, FTAG, &spa); 449 mos = spa->spa_meta_objset; 450 451 if (zfeature_is_supported(feature.fi_guid)) { 452 fatal(spa, FTAG, 453 "'%s' is a real feature, will not change refcount"); 454 } 455 456 if (0 == zap_contains(mos, spa->spa_feat_for_read_obj, 457 feature.fi_guid)) { 458 feature.fi_can_readonly = B_FALSE; 459 } else if (0 == zap_contains(mos, spa->spa_feat_for_write_obj, 460 feature.fi_guid)) { 461 feature.fi_can_readonly = B_TRUE; 462 } else { 463 fatal(spa, FTAG, "feature is not enabled: %s", feature.fi_guid); 464 } 465 466 if (decr) { 467 uint64_t count; 468 if (feature_get_refcount_from_disk(spa, &feature, 469 &count) == 0 && count != 0) { 470 fatal(spa, FTAG, "feature refcount already 0: %s", 471 feature.fi_guid); 472 } 473 } 474 475 VERIFY0(dsl_sync_task(spa_name(spa), NULL, 476 decr ? feature_decr_sync : feature_incr_sync, &feature, 5)); 477 478 spa_close(spa, FTAG); 479 } 480 481 static int 482 zhack_do_feature(int argc, char **argv) 483 { 484 char *subcommand; 485 486 argc--; 487 argv++; 488 if (argc == 0) { 489 (void) fprintf(stderr, 490 "error: no feature operation specified\n"); 491 usage(); 492 } 493 494 subcommand = argv[0]; 495 if (strcmp(subcommand, "stat") == 0) { 496 zhack_do_feature_stat(argc, argv); 497 } else if (strcmp(subcommand, "enable") == 0) { 498 zhack_do_feature_enable(argc, argv); 499 } else if (strcmp(subcommand, "ref") == 0) { 500 zhack_do_feature_ref(argc, argv); 501 } else { 502 (void) fprintf(stderr, "error: unknown subcommand: %s\n", 503 subcommand); 504 usage(); 505 } 506 507 return (0); 508 } 509 510 #define MAX_NUM_PATHS 1024 511 512 int 513 main(int argc, char **argv) 514 { 515 extern void zfs_prop_init(void); 516 517 char *path[MAX_NUM_PATHS]; 518 const char *subcommand; 519 int rv = 0; 520 char c; 521 522 g_importargs.path = path; 523 524 dprintf_setup(&argc, argv); 525 zfs_prop_init(); 526 527 while ((c = getopt(argc, argv, "c:d:")) != -1) { 528 switch (c) { 529 case 'c': 530 g_importargs.cachefile = optarg; 531 break; 532 case 'd': 533 assert(g_importargs.paths < MAX_NUM_PATHS); 534 g_importargs.path[g_importargs.paths++] = optarg; 535 break; 536 default: 537 usage(); 538 break; 539 } 540 } 541 542 argc -= optind; 543 argv += optind; 544 optind = 1; 545 546 if (argc == 0) { 547 (void) fprintf(stderr, "error: no command specified\n"); 548 usage(); 549 } 550 551 subcommand = argv[0]; 552 553 if (strcmp(subcommand, "feature") == 0) { 554 rv = zhack_do_feature(argc, argv); 555 } else { 556 (void) fprintf(stderr, "error: unknown subcommand: %s\n", 557 subcommand); 558 usage(); 559 } 560 561 if (!g_readonly && spa_export(g_pool, NULL, B_TRUE, B_FALSE) != 0) { 562 fatal(NULL, FTAG, "pool export failed; " 563 "changes may not be committed to disk\n"); 564 } 565 566 libzfs_fini(g_zfs); 567 kernel_fini(); 568 569 return (rv); 570 } 571