usr/src/common/zfs/zfs_comutil.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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2012 by Delphix. All rights reserved.
  24  */
  25
  26 /*
  27  * This file is intended for functions that ought to be common between user
  28  * land (libzfs) and the kernel. When many common routines need to be shared
  29  * then a separate file should to be created.
  30  */
  31
  32 #if defined(_KERNEL)
  33 #include <sys/systm.h>
  34 #else
  35 #include <string.h>
  36 #endif
  37
  38 #include <sys/types.h>
  39 #include <sys/fs/zfs.h>
  40 #include <sys/int_limits.h>
  41 #include <sys/nvpair.h>
  42 #include "zfs_comutil.h"
  43
  44 /*
  45  * Are there allocatable vdevs?
  46  */
  47 boolean_t
  48 zfs_allocatable_devs(nvlist_t *nv)
  49 {
  50         uint64_t is_log;
  51         uint_t c;
  52         nvlist_t **child;
  53         uint_t children;
  54
  55         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
  56             &child, &children) != 0) {
  57                 return (B_FALSE);
  58         }
  59         for (c = 0; c < children; c++) {
  60                 is_log = 0;
  61                 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
  62                     &is_log);
  63                 if (!is_log)
  64                         return (B_TRUE);
  65         }
  66         return (B_FALSE);
  67 }
  68
  69 void
  70 zpool_get_rewind_policy(nvlist_t *nvl, zpool_rewind_policy_t *zrpp)
  71 {
  72         nvlist_t *policy;
  73         nvpair_t *elem;
  74         char *nm;
  75
  76         /* Defaults */
  77         zrpp->zrp_request = ZPOOL_NO_REWIND;
  78         zrpp->zrp_maxmeta = 0;
  79         zrpp->zrp_maxdata = UINT64_MAX;
  80         zrpp->zrp_txg = UINT64_MAX;
  81
  82         if (nvl == NULL)
  83                 return;
  84
  85         elem = NULL;
  86         while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
  87                 nm = nvpair_name(elem);
  88                 if (strcmp(nm, ZPOOL_REWIND_POLICY) == 0) {
  89                         if (nvpair_value_nvlist(elem, &policy) == 0)
  90                                 zpool_get_rewind_policy(policy, zrpp);
  91                         return;
  92                 } else if (strcmp(nm, ZPOOL_REWIND_REQUEST) == 0) {
  93                         if (nvpair_value_uint32(elem, &zrpp->zrp_request) == 0)
  94                                 if (zrpp->zrp_request & ~ZPOOL_REWIND_POLICIES)
  95                                         zrpp->zrp_request = ZPOOL_NO_REWIND;
  96                 } else if (strcmp(nm, ZPOOL_REWIND_REQUEST_TXG) == 0) {
  97                         (void) nvpair_value_uint64(elem, &zrpp->zrp_txg);
  98                 } else if (strcmp(nm, ZPOOL_REWIND_META_THRESH) == 0) {
  99                         (void) nvpair_value_uint64(elem, &zrpp->zrp_maxmeta);
 100                 } else if (strcmp(nm, ZPOOL_REWIND_DATA_THRESH) == 0) {
 101                         (void) nvpair_value_uint64(elem, &zrpp->zrp_maxdata);
 102                 }
 103         }
 104         if (zrpp->zrp_request == 0)
 105                 zrpp->zrp_request = ZPOOL_NO_REWIND;
 106 }
 107
 108 typedef struct zfs_version_spa_map {
 109         int     version_zpl;
 110         int     version_spa;
 111 } zfs_version_spa_map_t;
 112
 113 /*
 114  * Keep this table in monotonically increasing version number order.
 115  */
 116 static zfs_version_spa_map_t zfs_version_table[] = {
 117         {ZPL_VERSION_INITIAL, SPA_VERSION_INITIAL},
 118         {ZPL_VERSION_DIRENT_TYPE, SPA_VERSION_INITIAL},
 119         {ZPL_VERSION_FUID, SPA_VERSION_FUID},
 120         {ZPL_VERSION_USERSPACE, SPA_VERSION_USERSPACE},
 121         {ZPL_VERSION_SA, SPA_VERSION_SA},
 122         {0, 0}
 123 };
 124
 125 /*
 126  * Return the max zpl version for a corresponding spa version
 127  * -1 is returned if no mapping exists.
 128  */
 129 int
 130 zfs_zpl_version_map(int spa_version)
 131 {
 132         int i;
 133         int version = -1;
 134
 135         for (i = 0; zfs_version_table[i].version_spa; i++) {
 136                 if (spa_version >= zfs_version_table[i].version_spa)
 137                         version = zfs_version_table[i].version_zpl;
 138         }
 139
 140         return (version);
 141 }
 142
 143 /*
 144  * Return the min spa version for a corresponding spa version
 145  * -1 is returned if no mapping exists.
 146  */
 147 int
 148 zfs_spa_version_map(int zpl_version)
 149 {
 150         int i;
 151         int version = -1;
 152
 153         for (i = 0; zfs_version_table[i].version_zpl; i++) {
 154                 if (zfs_version_table[i].version_zpl >= zpl_version)
 155                         return (zfs_version_table[i].version_spa);
 156         }
 157
 158         return (version);
 159 }
 160
 161 /*
 162  * This is the table of legacy internal event names; it should not be modified.
 163  * The internal events are now stored in the history log as strings.
 164  */
 165 const char *zfs_history_event_names[ZFS_NUM_LEGACY_HISTORY_EVENTS] = {
 166         "invalid event",
 167         "pool create",
 168         "vdev add",
 169         "pool remove",
 170         "pool destroy",
 171         "pool export",
 172         "pool import",
 173         "vdev attach",
 174         "vdev replace",
 175         "vdev detach",
 176         "vdev online",
 177         "vdev offline",
 178         "vdev upgrade",
 179         "pool clear",
 180         "pool scrub",
 181         "pool property set",
 182         "create",
 183         "clone",
 184         "destroy",
 185         "destroy_begin_sync",
 186         "inherit",
 187         "property set",
 188         "quota set",
 189         "permission update",
 190         "permission remove",
 191         "permission who remove",
 192         "promote",
 193         "receive",
 194         "rename",
 195         "reservation set",
 196         "replay_inc_sync",
 197         "replay_full_sync",
 198         "rollback",
 199         "snapshot",
 200         "filesystem version upgrade",
 201         "refquota set",
 202         "refreservation set",
 203         "pool scrub done",
 204         "user hold",
 205         "user release",
 206         "pool split",
 207 };