module/zcommon/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, 2017 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 be created.
  30  */
  31
  32 #if !defined(_KERNEL)
  33 #include <string.h>
  34 #endif
  35
  36 #include <sys/types.h>
  37 #include <sys/fs/zfs.h>
  38 #include <sys/nvpair.h>
  39 #include "zfs_comutil.h"
  40 #include <sys/zfs_ratelimit.h>
  41
  42 /*
  43  * Are there allocatable vdevs?
  44  */
  45 boolean_t
  46 zfs_allocatable_devs(nvlist_t *nv)
  47 {
  48         uint64_t is_log;
  49         uint_t c;
  50         nvlist_t **child;
  51         uint_t children;
  52
  53         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
  54             &child, &children) != 0) {
  55                 return (B_FALSE);
  56         }
  57         for (c = 0; c < children; c++) {
  58                 is_log = 0;
  59                 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
  60                     &is_log);
  61                 if (!is_log)
  62                         return (B_TRUE);
  63         }
  64         return (B_FALSE);
  65 }
  66
  67 /*
  68  * Are there special vdevs?
  69  */
  70 boolean_t
  71 zfs_special_devs(nvlist_t *nv, char *type)
  72 {
  73         char *bias;
  74         uint_t c;
  75         nvlist_t **child;
  76         uint_t children;
  77
  78         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
  79             &child, &children) != 0) {
  80                 return (B_FALSE);
  81         }
  82         for (c = 0; c < children; c++) {
  83                 if (nvlist_lookup_string(child[c], ZPOOL_CONFIG_ALLOCATION_BIAS,
  84                     &bias) == 0) {
  85                         if (strcmp(bias, VDEV_ALLOC_BIAS_SPECIAL) == 0 ||
  86                             strcmp(bias, VDEV_ALLOC_BIAS_DEDUP) == 0) {
  87                                 if (type != NULL && strcmp(bias, type) == 0) {
  88                                         return (B_TRUE);
  89                                 } else if (type == NULL) {
  90                                         return (B_TRUE);
  91                                 }
  92                         }
  93                 }
  94         }
  95         return (B_FALSE);
  96 }
  97
  98 void
  99 zpool_get_load_policy(nvlist_t *nvl, zpool_load_policy_t *zlpp)
 100 {
 101         nvlist_t *policy;
 102         nvpair_t *elem;
 103         char *nm;
 104
 105         /* Defaults */
 106         zlpp->zlp_rewind = ZPOOL_NO_REWIND;
 107         zlpp->zlp_maxmeta = 0;
 108         zlpp->zlp_maxdata = UINT64_MAX;
 109         zlpp->zlp_txg = UINT64_MAX;
 110
 111         if (nvl == NULL)
 112                 return;
 113
 114         elem = NULL;
 115         while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
 116                 nm = nvpair_name(elem);
 117                 if (strcmp(nm, ZPOOL_LOAD_POLICY) == 0) {
 118                         if (nvpair_value_nvlist(elem, &policy) == 0)
 119                                 zpool_get_load_policy(policy, zlpp);
 120                         return;
 121                 } else if (strcmp(nm, ZPOOL_LOAD_REWIND_POLICY) == 0) {
 122                         if (nvpair_value_uint32(elem, &zlpp->zlp_rewind) == 0)
 123                                 if (zlpp->zlp_rewind & ~ZPOOL_REWIND_POLICIES)
 124                                         zlpp->zlp_rewind = ZPOOL_NO_REWIND;
 125                 } else if (strcmp(nm, ZPOOL_LOAD_REQUEST_TXG) == 0) {
 126                         (void) nvpair_value_uint64(elem, &zlpp->zlp_txg);
 127                 } else if (strcmp(nm, ZPOOL_LOAD_META_THRESH) == 0) {
 128                         (void) nvpair_value_uint64(elem, &zlpp->zlp_maxmeta);
 129                 } else if (strcmp(nm, ZPOOL_LOAD_DATA_THRESH) == 0) {
 130                         (void) nvpair_value_uint64(elem, &zlpp->zlp_maxdata);
 131                 }
 132         }
 133         if (zlpp->zlp_rewind == 0)
 134                 zlpp->zlp_rewind = ZPOOL_NO_REWIND;
 135 }
 136
 137 typedef struct zfs_version_spa_map {
 138         int     version_zpl;
 139         int     version_spa;
 140 } zfs_version_spa_map_t;
 141
 142 /*
 143  * Keep this table in monotonically increasing version number order.
 144  */
 145 static zfs_version_spa_map_t zfs_version_table[] = {
 146         {ZPL_VERSION_INITIAL, SPA_VERSION_INITIAL},
 147         {ZPL_VERSION_DIRENT_TYPE, SPA_VERSION_INITIAL},
 148         {ZPL_VERSION_FUID, SPA_VERSION_FUID},
 149         {ZPL_VERSION_USERSPACE, SPA_VERSION_USERSPACE},
 150         {ZPL_VERSION_SA, SPA_VERSION_SA},
 151         {0, 0}
 152 };
 153
 154 /*
 155  * Return the max zpl version for a corresponding spa version
 156  * -1 is returned if no mapping exists.
 157  */
 158 int
 159 zfs_zpl_version_map(int spa_version)
 160 {
 161         int version = -1;
 162
 163         for (int i = 0; zfs_version_table[i].version_spa; i++)
 164                 if (spa_version >= zfs_version_table[i].version_spa)
 165                         version = zfs_version_table[i].version_zpl;
 166
 167         return (version);
 168 }
 169
 170 /*
 171  * Return the min spa version for a corresponding spa version
 172  * -1 is returned if no mapping exists.
 173  */
 174 int
 175 zfs_spa_version_map(int zpl_version)
 176 {
 177         for (int i = 0; zfs_version_table[i].version_zpl; i++)
 178                 if (zfs_version_table[i].version_zpl >= zpl_version)
 179                         return (zfs_version_table[i].version_spa);
 180
 181         return (-1);
 182 }
 183
 184 /*
 185  * This is the table of legacy internal event names; it should not be modified.
 186  * The internal events are now stored in the history log as strings.
 187  */
 188 const char *const zfs_history_event_names[ZFS_NUM_LEGACY_HISTORY_EVENTS] = {
 189         "invalid event",
 190         "pool create",
 191         "vdev add",
 192         "pool remove",
 193         "pool destroy",
 194         "pool export",
 195         "pool import",
 196         "vdev attach",
 197         "vdev replace",
 198         "vdev detach",
 199         "vdev online",
 200         "vdev offline",
 201         "vdev upgrade",
 202         "pool clear",
 203         "pool scrub",
 204         "pool property set",
 205         "create",
 206         "clone",
 207         "destroy",
 208         "destroy_begin_sync",
 209         "inherit",
 210         "property set",
 211         "quota set",
 212         "permission update",
 213         "permission remove",
 214         "permission who remove",
 215         "promote",
 216         "receive",
 217         "rename",
 218         "reservation set",
 219         "replay_inc_sync",
 220         "replay_full_sync",
 221         "rollback",
 222         "snapshot",
 223         "filesystem version upgrade",
 224         "refquota set",
 225         "refreservation set",
 226         "pool scrub done",
 227         "user hold",
 228         "user release",
 229         "pool split",
 230 };
 231
 232 boolean_t
 233 zfs_dataset_name_hidden(const char *name)
 234 {
 235         /*
 236          * Skip over datasets that are not visible in this zone,
 237          * internal datasets (which have a $ in their name), and
 238          * temporary datasets (which have a % in their name).
 239          */
 240         if (strpbrk(name, "$%") != NULL)
 241                 return (B_TRUE);
 242         if (!INGLOBALZONE(curproc) && !zone_dataset_visible(name, NULL))
 243                 return (B_TRUE);
 244         return (B_FALSE);
 245 }
 246
 247 #if defined(_KERNEL)
 248 EXPORT_SYMBOL(zfs_allocatable_devs);
 249 EXPORT_SYMBOL(zfs_special_devs);
 250 EXPORT_SYMBOL(zpool_get_load_policy);
 251 EXPORT_SYMBOL(zfs_zpl_version_map);
 252 EXPORT_SYMBOL(zfs_spa_version_map);
 253 EXPORT_SYMBOL(zfs_history_event_names);
 254 EXPORT_SYMBOL(zfs_dataset_name_hidden);
 255 #endif