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