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 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <libzfs.h> 29 30 #undef verify /* both libzfs.h and zfs_context.h want to define this */ 31 32 #include <sys/zfs_context.h> 33 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <stdarg.h> 37 #include <stddef.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <strings.h> 41 #include <sys/file.h> 42 #include <sys/mntent.h> 43 #include <sys/mnttab.h> 44 #include <sys/param.h> 45 #include <sys/stat.h> 46 47 #include <sys/dmu.h> 48 #include <sys/dmu_objset.h> 49 #include <sys/dnode.h> 50 #include <sys/vdev_impl.h> 51 52 #include <sys/mkdev.h> 53 54 #include "zinject.h" 55 56 extern void kernel_init(int); 57 extern void kernel_fini(void); 58 59 static int debug; 60 61 static void 62 ziprintf(const char *fmt, ...) 63 { 64 va_list ap; 65 66 if (!debug) 67 return; 68 69 va_start(ap, fmt); 70 (void) vprintf(fmt, ap); 71 va_end(ap); 72 } 73 74 /* 75 * Given a full path to a file, translate into a dataset name and a relative 76 * path within the dataset. 'dataset' must be at least MAXNAMELEN characters, 77 * and 'relpath' must be at least MAXPATHLEN characters. We also pass a stat64 78 * buffer, which we need later to get the object ID. 79 */ 80 static int 81 parse_pathname(const char *fullpath, char *dataset, char *relpath, 82 struct stat64 *statbuf) 83 { 84 struct extmnttab mp; 85 FILE *fp; 86 int match; 87 const char *rel; 88 89 if (fullpath[0] != '/') { 90 (void) fprintf(stderr, "invalid object '%s': must be full " 91 "path\n", fullpath); 92 usage(); 93 return (-1); 94 } 95 96 if (strlen(fullpath) >= MAXPATHLEN) { 97 (void) fprintf(stderr, "invalid object; pathname too long\n"); 98 return (-1); 99 } 100 101 if (stat64(fullpath, statbuf) != 0) { 102 (void) fprintf(stderr, "cannot open '%s': %s\n", 103 fullpath, strerror(errno)); 104 return (-1); 105 } 106 107 if ((fp = fopen(MNTTAB, "r")) == NULL) { 108 (void) fprintf(stderr, "cannot open /etc/mnttab\n"); 109 return (-1); 110 } 111 112 match = 0; 113 while (getextmntent(fp, &mp, sizeof (mp)) == 0) { 114 if (makedev(mp.mnt_major, mp.mnt_minor) == statbuf->st_dev) { 115 match = 1; 116 break; 117 } 118 } 119 120 if (!match) { 121 (void) fprintf(stderr, "cannot find mountpoint for '%s'\n", 122 fullpath); 123 return (-1); 124 } 125 126 if (strcmp(mp.mnt_fstype, MNTTYPE_ZFS) != 0) { 127 (void) fprintf(stderr, "invalid path '%s': not a ZFS " 128 "filesystem\n", fullpath); 129 return (-1); 130 } 131 132 if (strncmp(fullpath, mp.mnt_mountp, strlen(mp.mnt_mountp)) != 0) { 133 (void) fprintf(stderr, "invalid path '%s': mountpoint " 134 "doesn't match path\n", fullpath); 135 return (-1); 136 } 137 138 (void) strcpy(dataset, mp.mnt_special); 139 140 rel = fullpath + strlen(mp.mnt_mountp); 141 if (rel[0] == '/') 142 rel++; 143 (void) strcpy(relpath, rel); 144 145 return (0); 146 } 147 148 /* 149 * Convert from a (dataset, path) pair into a (objset, object) pair. Note that 150 * we grab the object number from the inode number, since looking this up via 151 * libzpool is a real pain. 152 */ 153 /* ARGSUSED */ 154 static int 155 object_from_path(const char *dataset, const char *path, struct stat64 *statbuf, 156 zinject_record_t *record) 157 { 158 objset_t *os; 159 int err; 160 161 /* 162 * Before doing any libzpool operations, call sync() to ensure that the 163 * on-disk state is consistent with the in-core state. 164 */ 165 sync(); 166 167 if ((err = dmu_objset_open(dataset, DMU_OST_ZFS, 168 DS_MODE_STANDARD | DS_MODE_READONLY, &os)) != 0) { 169 (void) fprintf(stderr, "cannot open dataset '%s': %s\n", 170 dataset, strerror(err)); 171 return (-1); 172 } 173 174 record->zi_objset = dmu_objset_id(os); 175 record->zi_object = statbuf->st_ino; 176 177 dmu_objset_close(os); 178 179 return (0); 180 } 181 182 /* 183 * Calculate the real range based on the type, level, and range given. 184 */ 185 static int 186 calculate_range(const char *dataset, err_type_t type, int level, char *range, 187 zinject_record_t *record) 188 { 189 objset_t *os = NULL; 190 dnode_t *dn = NULL; 191 int err; 192 int ret = -1; 193 194 /* 195 * Determine the numeric range from the string. 196 */ 197 if (range == NULL) { 198 /* 199 * If range is unspecified, set the range to [0,-1], which 200 * indicates that the whole object should be treated as an 201 * error. 202 */ 203 record->zi_start = 0; 204 record->zi_end = -1ULL; 205 } else { 206 char *end; 207 208 /* XXX add support for suffixes */ 209 record->zi_start = strtoull(range, &end, 10); 210 211 212 if (*end == '\0') 213 record->zi_end = record->zi_start + 1; 214 else if (*end == ',') 215 record->zi_end = strtoull(end + 1, &end, 10); 216 217 if (*end != '\0') { 218 (void) fprintf(stderr, "invalid range '%s': must be " 219 "a numeric range of the form 'start[,end]'\n", 220 range); 221 goto out; 222 } 223 } 224 225 switch (type) { 226 case TYPE_DATA: 227 break; 228 229 case TYPE_DNODE: 230 /* 231 * If this is a request to inject faults into the dnode, then we 232 * must translate the current (objset,object) pair into an 233 * offset within the metadnode for the objset. Specifying any 234 * kind of range with type 'dnode' is illegal. 235 */ 236 if (range != NULL) { 237 (void) fprintf(stderr, "range cannot be specified when " 238 "type is 'dnode'\n"); 239 goto out; 240 } 241 242 record->zi_start = record->zi_object * sizeof (dnode_phys_t); 243 record->zi_end = record->zi_start + sizeof (dnode_phys_t); 244 record->zi_object = 0; 245 break; 246 } 247 248 /* 249 * Get the dnode associated with object, so we can calculate the block 250 * size. 251 */ 252 if ((err = dmu_objset_open(dataset, DMU_OST_ANY, 253 DS_MODE_STANDARD | DS_MODE_READONLY, &os)) != 0) { 254 (void) fprintf(stderr, "cannot open dataset '%s': %s\n", 255 dataset, strerror(err)); 256 goto out; 257 } 258 259 if (record->zi_object == 0) { 260 dn = os->os->os_meta_dnode; 261 } else { 262 err = dnode_hold(os->os, record->zi_object, FTAG, &dn); 263 if (err != 0) { 264 (void) fprintf(stderr, "failed to hold dnode " 265 "for object %llu\n", 266 (u_longlong_t)record->zi_object); 267 goto out; 268 } 269 } 270 271 272 ziprintf("data shift: %d\n", (int)dn->dn_datablkshift); 273 ziprintf(" ind shift: %d\n", (int)dn->dn_indblkshift); 274 275 /* 276 * Translate range into block IDs. 277 */ 278 if (record->zi_start != 0 || record->zi_end != -1ULL) { 279 record->zi_start >>= dn->dn_datablkshift; 280 record->zi_end >>= dn->dn_datablkshift; 281 } 282 283 /* 284 * Check level, and then translate level 0 blkids into ranges 285 * appropriate for level of indirection. 286 */ 287 record->zi_level = level; 288 if (level > 0) { 289 ziprintf("level 0 blkid range: [%llu, %llu]\n", 290 record->zi_start, record->zi_end); 291 292 if (level >= dn->dn_nlevels) { 293 (void) fprintf(stderr, "level %d exceeds max level " 294 "of object (%d)\n", level, dn->dn_nlevels - 1); 295 goto out; 296 } 297 298 if (record->zi_start != 0 || record->zi_end != 0) { 299 int shift = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 300 301 for (; level > 0; level--) { 302 record->zi_start >>= shift; 303 record->zi_end >>= shift; 304 } 305 } 306 } 307 308 ret = 0; 309 out: 310 if (dn) { 311 if (dn != os->os->os_meta_dnode) 312 dnode_rele(dn, FTAG); 313 } 314 if (os) 315 dmu_objset_close(os); 316 317 return (ret); 318 } 319 320 int 321 translate_record(err_type_t type, const char *object, const char *range, 322 int level, zinject_record_t *record, char *poolname, char *dataset) 323 { 324 char path[MAXPATHLEN]; 325 char *slash; 326 struct stat64 statbuf; 327 int ret = -1; 328 329 kernel_init(FREAD); 330 331 debug = (getenv("ZINJECT_DEBUG") != NULL); 332 333 ziprintf("translating: %s\n", object); 334 335 if (MOS_TYPE(type)) { 336 /* 337 * MOS objects are treated specially. 338 */ 339 switch (type) { 340 case TYPE_MOS: 341 record->zi_type = 0; 342 break; 343 case TYPE_MOSDIR: 344 record->zi_type = DMU_OT_OBJECT_DIRECTORY; 345 break; 346 case TYPE_METASLAB: 347 record->zi_type = DMU_OT_OBJECT_ARRAY; 348 break; 349 case TYPE_CONFIG: 350 record->zi_type = DMU_OT_PACKED_NVLIST; 351 break; 352 case TYPE_BPLIST: 353 record->zi_type = DMU_OT_BPLIST; 354 break; 355 case TYPE_SPACEMAP: 356 record->zi_type = DMU_OT_SPACE_MAP; 357 break; 358 case TYPE_ERRLOG: 359 record->zi_type = DMU_OT_ERROR_LOG; 360 break; 361 } 362 363 dataset[0] = '\0'; 364 (void) strcpy(poolname, object); 365 return (0); 366 } 367 368 /* 369 * Convert a full path into a (dataset, file) pair. 370 */ 371 if (parse_pathname(object, dataset, path, &statbuf) != 0) 372 goto err; 373 374 ziprintf(" dataset: %s\n", dataset); 375 ziprintf(" path: %s\n", path); 376 377 /* 378 * Convert (dataset, file) into (objset, object) 379 */ 380 if (object_from_path(dataset, path, &statbuf, record) != 0) 381 goto err; 382 383 ziprintf("raw objset: %llu\n", record->zi_objset); 384 ziprintf("raw object: %llu\n", record->zi_object); 385 386 /* 387 * For the given object, calculate the real (type, level, range) 388 */ 389 if (calculate_range(dataset, type, level, (char *)range, record) != 0) 390 goto err; 391 392 ziprintf(" objset: %llu\n", record->zi_objset); 393 ziprintf(" object: %llu\n", record->zi_object); 394 if (record->zi_start == 0 && 395 record->zi_end == -1ULL) 396 ziprintf(" range: all\n"); 397 else 398 ziprintf(" range: [%llu, %llu]\n", record->zi_start, 399 record->zi_end); 400 401 /* 402 * Copy the pool name 403 */ 404 (void) strcpy(poolname, dataset); 405 if ((slash = strchr(poolname, '/')) != NULL) 406 *slash = '\0'; 407 408 ret = 0; 409 410 err: 411 kernel_fini(); 412 return (ret); 413 } 414 415 int 416 translate_raw(const char *str, zinject_record_t *record) 417 { 418 /* 419 * A raw bookmark of the form objset:object:level:blkid, where each 420 * number is a hexidecimal value. 421 */ 422 if (sscanf(str, "%llx:%llx:%x:%llx", (u_longlong_t *)&record->zi_objset, 423 (u_longlong_t *)&record->zi_object, &record->zi_level, 424 (u_longlong_t *)&record->zi_start) != 4) { 425 (void) fprintf(stderr, "bad raw spec '%s': must be of the form " 426 "'objset:object:level:blkid'\n", str); 427 return (-1); 428 } 429 430 record->zi_end = record->zi_start; 431 432 return (0); 433 } 434 435 int 436 translate_device(const char *pool, const char *device, err_type_t label_type, 437 zinject_record_t *record) 438 { 439 char *end; 440 zpool_handle_t *zhp; 441 nvlist_t *tgt; 442 boolean_t isspare, iscache; 443 444 /* 445 * Given a device name or GUID, create an appropriate injection record 446 * with zi_guid set. 447 */ 448 if ((zhp = zpool_open(g_zfs, pool)) == NULL) 449 return (-1); 450 451 record->zi_guid = strtoull(device, &end, 16); 452 if (record->zi_guid == 0 || *end != '\0') { 453 tgt = zpool_find_vdev(zhp, device, &isspare, &iscache); 454 455 if (tgt == NULL) { 456 (void) fprintf(stderr, "cannot find device '%s' in " 457 "pool '%s'\n", device, pool); 458 return (-1); 459 } 460 461 verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, 462 &record->zi_guid) == 0); 463 } 464 465 switch (label_type) { 466 case TYPE_LABEL_UBERBLOCK: 467 record->zi_start = offsetof(vdev_label_t, vl_uberblock[0]); 468 record->zi_end = record->zi_start + VDEV_UBERBLOCK_RING - 1; 469 break; 470 case TYPE_LABEL_NVLIST: 471 record->zi_start = offsetof(vdev_label_t, vl_vdev_phys); 472 record->zi_end = record->zi_start + VDEV_PHYS_SIZE - 1; 473 break; 474 } 475 return (0); 476 } 477