usr/src/lib/libzfs/common/libzfs_status.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 /*
  23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright (c) 2012 by Delphix. All rights reserved.
  25  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  26  */
  27
  28 /*
  29  * This file contains the functions which analyze the status of a pool.  This
  30  * include both the status of an active pool, as well as the status exported
  31  * pools.  Returns one of the ZPOOL_STATUS_* defines describing the status of
  32  * the pool.  This status is independent (to a certain degree) from the state of
  33  * the pool.  A pool's state describes only whether or not it is capable of
  34  * providing the necessary fault tolerance for data.  The status describes the
  35  * overall status of devices.  A pool that is online can still have a device
  36  * that is experiencing errors.
  37  *
  38  * Only a subset of the possible faults can be detected using 'zpool status',
  39  * and not all possible errors correspond to a FMA message ID.  The explanation
  40  * is left up to the caller, depending on whether it is a live pool or an
  41  * import.
  42  */
  43
  44 #include <libzfs.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include "libzfs_impl.h"
  48 #include "zfeature_common.h"
  49
  50 /*
  51  * Message ID table.  This must be kept in sync with the ZPOOL_STATUS_* defines
  52  * in libzfs.h.  Note that there are some status results which go past the end
  53  * of this table, and hence have no associated message ID.
  54  */
  55 static char *zfs_msgid_table[] = {
  56         "ZFS-8000-14",
  57         "ZFS-8000-2Q",
  58         "ZFS-8000-3C",
  59         "ZFS-8000-4J",
  60         "ZFS-8000-5E",
  61         "ZFS-8000-6X",
  62         "ZFS-8000-72",
  63         "ZFS-8000-8A",
  64         "ZFS-8000-9P",
  65         "ZFS-8000-A5",
  66         "ZFS-8000-EY",
  67         "ZFS-8000-HC",
  68         "ZFS-8000-JQ",
  69         "ZFS-8000-K4",
  70 };
  71
  72 #define NMSGID  (sizeof (zfs_msgid_table) / sizeof (zfs_msgid_table[0]))
  73
  74 /* ARGSUSED */
  75 static int
  76 vdev_missing(uint64_t state, uint64_t aux, uint64_t errs)
  77 {
  78         return (state == VDEV_STATE_CANT_OPEN &&
  79             aux == VDEV_AUX_OPEN_FAILED);
  80 }
  81
  82 /* ARGSUSED */
  83 static int
  84 vdev_faulted(uint64_t state, uint64_t aux, uint64_t errs)
  85 {
  86         return (state == VDEV_STATE_FAULTED);
  87 }
  88
  89 /* ARGSUSED */
  90 static int
  91 vdev_errors(uint64_t state, uint64_t aux, uint64_t errs)
  92 {
  93         return (state == VDEV_STATE_DEGRADED || errs != 0);
  94 }
  95
  96 /* ARGSUSED */
  97 static int
  98 vdev_broken(uint64_t state, uint64_t aux, uint64_t errs)
  99 {
 100         return (state == VDEV_STATE_CANT_OPEN);
 101 }
 102
 103 /* ARGSUSED */
 104 static int
 105 vdev_offlined(uint64_t state, uint64_t aux, uint64_t errs)
 106 {
 107         return (state == VDEV_STATE_OFFLINE);
 108 }
 109
 110 /* ARGSUSED */
 111 static int
 112 vdev_removed(uint64_t state, uint64_t aux, uint64_t errs)
 113 {
 114         return (state == VDEV_STATE_REMOVED);
 115 }
 116
 117 /*
 118  * Detect if any leaf devices that have seen errors or could not be opened.
 119  */
 120 static boolean_t
 121 find_vdev_problem(nvlist_t *vdev, int (*func)(uint64_t, uint64_t, uint64_t))
 122 {
 123         nvlist_t **child;
 124         vdev_stat_t *vs;
 125         uint_t c, children;
 126         char *type;
 127
 128         /*
 129          * Ignore problems within a 'replacing' vdev, since we're presumably in
 130          * the process of repairing any such errors, and don't want to call them
 131          * out again.  We'll pick up the fact that a resilver is happening
 132          * later.
 133          */
 134         verify(nvlist_lookup_string(vdev, ZPOOL_CONFIG_TYPE, &type) == 0);
 135         if (strcmp(type, VDEV_TYPE_REPLACING) == 0)
 136                 return (B_FALSE);
 137
 138         if (nvlist_lookup_nvlist_array(vdev, ZPOOL_CONFIG_CHILDREN, &child,
 139             &children) == 0) {
 140                 for (c = 0; c < children; c++)
 141                         if (find_vdev_problem(child[c], func))
 142                                 return (B_TRUE);
 143         } else {
 144                 verify(nvlist_lookup_uint64_array(vdev, ZPOOL_CONFIG_VDEV_STATS,
 145                     (uint64_t **)&vs, &c) == 0);
 146
 147                 if (func(vs->vs_state, vs->vs_aux,
 148                     vs->vs_read_errors +
 149                     vs->vs_write_errors +
 150                     vs->vs_checksum_errors))
 151                         return (B_TRUE);
 152         }
 153
 154         /*
 155          * Check any L2 cache devs
 156          */
 157         if (nvlist_lookup_nvlist_array(vdev, ZPOOL_CONFIG_L2CACHE, &child,
 158             &children) == 0) {
 159                 for (c = 0; c < children; c++)
 160                         if (find_vdev_problem(child[c], func))
 161                                 return (B_TRUE);
 162         }
 163
 164         return (B_FALSE);
 165 }
 166
 167 /*
 168  * Active pool health status.
 169  *
 170  * To determine the status for a pool, we make several passes over the config,
 171  * picking the most egregious error we find.  In order of importance, we do the
 172  * following:
 173  *
 174  *      - Check for a complete and valid configuration
 175  *      - Look for any faulted or missing devices in a non-replicated config
 176  *      - Check for any data errors
 177  *      - Check for any faulted or missing devices in a replicated config
 178  *      - Look for any devices showing errors
 179  *      - Check for any resilvering devices
 180  *
 181  * There can obviously be multiple errors within a single pool, so this routine
 182  * only picks the most damaging of all the current errors to report.
 183  */
 184 static zpool_status_t
 185 check_status(nvlist_t *config, boolean_t isimport)
 186 {
 187         nvlist_t *nvroot;
 188         vdev_stat_t *vs;
 189         pool_scan_stat_t *ps = NULL;
 190         uint_t vsc, psc;
 191         uint64_t nerr;
 192         uint64_t version;
 193         uint64_t stateval;
 194         uint64_t suspended;
 195         uint64_t hostid = 0;
 196
 197         verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION,
 198             &version) == 0);
 199         verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
 200             &nvroot) == 0);
 201         verify(nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_VDEV_STATS,
 202             (uint64_t **)&vs, &vsc) == 0);
 203         verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
 204             &stateval) == 0);
 205
 206         /*
 207          * Currently resilvering a vdev
 208          */
 209         (void) nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_SCAN_STATS,
 210             (uint64_t **)&ps, &psc);
 211         if (ps && ps->pss_func == POOL_SCAN_RESILVER &&
 212             ps->pss_state == DSS_SCANNING)
 213                 return (ZPOOL_STATUS_RESILVERING);
 214
 215         /*
 216          * Pool last accessed by another system.
 217          */
 218         (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID, &hostid);
 219         if (hostid != 0 && (unsigned long)hostid != gethostid() &&
 220             stateval == POOL_STATE_ACTIVE)
 221                 return (ZPOOL_STATUS_HOSTID_MISMATCH);
 222
 223         /*
 224          * Newer on-disk version.
 225          */
 226         if (vs->vs_state == VDEV_STATE_CANT_OPEN &&
 227             vs->vs_aux == VDEV_AUX_VERSION_NEWER)
 228                 return (ZPOOL_STATUS_VERSION_NEWER);
 229
 230         /*
 231          * Unsupported feature(s).
 232          */
 233         if (vs->vs_state == VDEV_STATE_CANT_OPEN &&
 234             vs->vs_aux == VDEV_AUX_UNSUP_FEAT) {
 235                 nvlist_t *nvinfo;
 236
 237                 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO,
 238                     &nvinfo) == 0);
 239                 if (nvlist_exists(nvinfo, ZPOOL_CONFIG_CAN_RDONLY))
 240                         return (ZPOOL_STATUS_UNSUP_FEAT_WRITE);
 241                 return (ZPOOL_STATUS_UNSUP_FEAT_READ);
 242         }
 243
 244         /*
 245          * Check that the config is complete.
 246          */
 247         if (vs->vs_state == VDEV_STATE_CANT_OPEN &&
 248             vs->vs_aux == VDEV_AUX_BAD_GUID_SUM)
 249                 return (ZPOOL_STATUS_BAD_GUID_SUM);
 250
 251         /*
 252          * Check whether the pool has suspended due to failed I/O.
 253          */
 254         if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_SUSPENDED,
 255             &suspended) == 0) {
 256                 if (suspended == ZIO_FAILURE_MODE_CONTINUE)
 257                         return (ZPOOL_STATUS_IO_FAILURE_CONTINUE);
 258                 return (ZPOOL_STATUS_IO_FAILURE_WAIT);
 259         }
 260
 261         /*
 262          * Could not read a log.
 263          */
 264         if (vs->vs_state == VDEV_STATE_CANT_OPEN &&
 265             vs->vs_aux == VDEV_AUX_BAD_LOG) {
 266                 return (ZPOOL_STATUS_BAD_LOG);
 267         }
 268
 269         /*
 270          * Bad devices in non-replicated config.
 271          */
 272         if (vs->vs_state == VDEV_STATE_CANT_OPEN &&
 273             find_vdev_problem(nvroot, vdev_faulted))
 274                 return (ZPOOL_STATUS_FAULTED_DEV_NR);
 275
 276         if (vs->vs_state == VDEV_STATE_CANT_OPEN &&
 277             find_vdev_problem(nvroot, vdev_missing))
 278                 return (ZPOOL_STATUS_MISSING_DEV_NR);
 279
 280         if (vs->vs_state == VDEV_STATE_CANT_OPEN &&
 281             find_vdev_problem(nvroot, vdev_broken))
 282                 return (ZPOOL_STATUS_CORRUPT_LABEL_NR);
 283
 284         /*
 285          * Corrupted pool metadata
 286          */
 287         if (vs->vs_state == VDEV_STATE_CANT_OPEN &&
 288             vs->vs_aux == VDEV_AUX_CORRUPT_DATA)
 289                 return (ZPOOL_STATUS_CORRUPT_POOL);
 290
 291         /*
 292          * Persistent data errors.
 293          */
 294         if (!isimport) {
 295                 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_ERRCOUNT,
 296                     &nerr) == 0 && nerr != 0)
 297                         return (ZPOOL_STATUS_CORRUPT_DATA);
 298         }
 299
 300         /*
 301          * Missing devices in a replicated config.
 302          */
 303         if (find_vdev_problem(nvroot, vdev_faulted))
 304                 return (ZPOOL_STATUS_FAULTED_DEV_R);
 305         if (find_vdev_problem(nvroot, vdev_missing))
 306                 return (ZPOOL_STATUS_MISSING_DEV_R);
 307         if (find_vdev_problem(nvroot, vdev_broken))
 308                 return (ZPOOL_STATUS_CORRUPT_LABEL_R);
 309
 310         /*
 311          * Devices with errors
 312          */
 313         if (!isimport && find_vdev_problem(nvroot, vdev_errors))
 314                 return (ZPOOL_STATUS_FAILING_DEV);
 315
 316         /*
 317          * Offlined devices
 318          */
 319         if (find_vdev_problem(nvroot, vdev_offlined))
 320                 return (ZPOOL_STATUS_OFFLINE_DEV);
 321
 322         /*
 323          * Removed device
 324          */
 325         if (find_vdev_problem(nvroot, vdev_removed))
 326                 return (ZPOOL_STATUS_REMOVED_DEV);
 327
 328         /*
 329          * Outdated, but usable, version
 330          */
 331         if (SPA_VERSION_IS_SUPPORTED(version) && version != SPA_VERSION)
 332                 return (ZPOOL_STATUS_VERSION_OLDER);
 333
 334         /*
 335          * Usable pool with disabled features
 336          */
 337         if (version >= SPA_VERSION_FEATURES) {
 338                 int i;
 339                 nvlist_t *feat;
 340
 341                 if (isimport) {
 342                         feat = fnvlist_lookup_nvlist(config,
 343                             ZPOOL_CONFIG_LOAD_INFO);
 344                         feat = fnvlist_lookup_nvlist(feat,
 345                             ZPOOL_CONFIG_ENABLED_FEAT);
 346                 } else {
 347                         feat = fnvlist_lookup_nvlist(config,
 348                             ZPOOL_CONFIG_FEATURE_STATS);
 349                 }
 350
 351                 for (i = 0; i < SPA_FEATURES; i++) {
 352                         zfeature_info_t *fi = &spa_feature_table[i];
 353                         if (!nvlist_exists(feat, fi->fi_guid))
 354                                 return (ZPOOL_STATUS_FEAT_DISABLED);
 355                 }
 356         }
 357
 358         return (ZPOOL_STATUS_OK);
 359 }
 360
 361 zpool_status_t
 362 zpool_get_status(zpool_handle_t *zhp, char **msgid)
 363 {
 364         zpool_status_t ret = check_status(zhp->zpool_config, B_FALSE);
 365
 366         if (ret >= NMSGID)
 367                 *msgid = NULL;
 368         else
 369                 *msgid = zfs_msgid_table[ret];
 370
 371         return (ret);
 372 }
 373
 374 zpool_status_t
 375 zpool_import_status(nvlist_t *config, char **msgid)
 376 {
 377         zpool_status_t ret = check_status(config, B_TRUE);
 378
 379         if (ret >= NMSGID)
 380                 *msgid = NULL;
 381         else
 382                 *msgid = zfs_msgid_table[ret];
 383
 384         return (ret);
 385 }
 386
 387 static void
 388 dump_ddt_stat(const ddt_stat_t *dds, int h)
 389 {
 390         char refcnt[6];
 391         char blocks[6], lsize[6], psize[6], dsize[6];
 392         char ref_blocks[6], ref_lsize[6], ref_psize[6], ref_dsize[6];
 393
 394         if (dds == NULL || dds->dds_blocks == 0)
 395                 return;
 396
 397         if (h == -1)
 398                 (void) strcpy(refcnt, "Total");
 399         else
 400                 zfs_nicenum(1ULL << h, refcnt, sizeof (refcnt));
 401
 402         zfs_nicenum(dds->dds_blocks, blocks, sizeof (blocks));
 403         zfs_nicenum(dds->dds_lsize, lsize, sizeof (lsize));
 404         zfs_nicenum(dds->dds_psize, psize, sizeof (psize));
 405         zfs_nicenum(dds->dds_dsize, dsize, sizeof (dsize));
 406         zfs_nicenum(dds->dds_ref_blocks, ref_blocks, sizeof (ref_blocks));
 407         zfs_nicenum(dds->dds_ref_lsize, ref_lsize, sizeof (ref_lsize));
 408         zfs_nicenum(dds->dds_ref_psize, ref_psize, sizeof (ref_psize));
 409         zfs_nicenum(dds->dds_ref_dsize, ref_dsize, sizeof (ref_dsize));
 410
 411         (void) printf("%6s   %6s   %5s   %5s   %5s   %6s   %5s   %5s   %5s\n",
 412             refcnt,
 413             blocks, lsize, psize, dsize,
 414             ref_blocks, ref_lsize, ref_psize, ref_dsize);
 415 }
 416
 417 /*
 418  * Print the DDT histogram and the column totals.
 419  */
 420 void
 421 zpool_dump_ddt(const ddt_stat_t *dds_total, const ddt_histogram_t *ddh)
 422 {
 423         int h;
 424
 425         (void) printf("\n");
 426
 427         (void) printf("bucket   "
 428             "           allocated             "
 429             "          referenced          \n");
 430         (void) printf("______   "
 431             "______________________________   "
 432             "______________________________\n");
 433
 434         (void) printf("%6s   %6s   %5s   %5s   %5s   %6s   %5s   %5s   %5s\n",
 435             "refcnt",
 436             "blocks", "LSIZE", "PSIZE", "DSIZE",
 437             "blocks", "LSIZE", "PSIZE", "DSIZE");
 438
 439         (void) printf("%6s   %6s   %5s   %5s   %5s   %6s   %5s   %5s   %5s\n",
 440             "------",
 441             "------", "-----", "-----", "-----",
 442             "------", "-----", "-----", "-----");
 443
 444         for (h = 0; h < 64; h++)
 445                 dump_ddt_stat(&ddh->ddh_stat[h], h);
 446
 447         dump_ddt_stat(dds_total, -1);
 448
 449         (void) printf("\n");
 450 }