cmd/zinject/translate.c

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