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  */
  24
  25 /*
  26  * This file is intended for functions that ought to be common between user
  27  * land (libzfs) and the kernel. When many common routines need to be shared
  28  * then a separate file should to be created.
  29  */
  30
  31 #if defined(_KERNEL)
  32 #include <sys/systm.h>
  33 #else
  34 #include <string.h>
  35 #endif
  36
  37 #include <sys/types.h>
  38 #include <sys/fs/zfs.h>
  39 #include <sys/int_limits.h>
  40 #include <sys/nvpair.h>
  41 #include "zfs_comutil.h"
  42
  43 /*
  44  * Are there allocatable vdevs?
  45  */
  46 boolean_t
  47 zfs_allocatable_devs(nvlist_t *nv)
  48 {
  49         uint64_t is_log;
  50         uint_t c;
  51         nvlist_t **child;
  52         uint_t children;
  53
  54         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
  55             &child, &children) != 0) {
  56                 return (B_FALSE);
  57         }
  58         for (c = 0; c < children; c++) {
  59                 is_log = 0;
  60                 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
  61                     &is_log);
  62                 if (!is_log)
  63                         return (B_TRUE);
  64         }
  65         return (B_FALSE);
  66 }
  67
  68 void
  69 zpool_get_rewind_policy(nvlist_t *nvl, zpool_rewind_policy_t *zrpp)
  70 {
  71         nvlist_t *policy;
  72         nvpair_t *elem;
  73         char *nm;
  74
  75         /* Defaults */
  76         zrpp->zrp_request = ZPOOL_NO_REWIND;
  77         zrpp->zrp_maxmeta = 0;
  78         zrpp->zrp_maxdata = UINT64_MAX;
  79         zrpp->zrp_txg = UINT64_MAX;
  80
  81         if (nvl == NULL)
  82                 return;
  83
  84         elem = NULL;
  85         while ((elem = nvlist_next_nvpair(nvl, elem)) != NULL) {
  86                 nm = nvpair_name(elem);
  87                 if (strcmp(nm, ZPOOL_REWIND_POLICY) == 0) {
  88                         if (nvpair_value_nvlist(elem, &policy) == 0)
  89                                 zpool_get_rewind_policy(policy, zrpp);
  90                         return;
  91                 } else if (strcmp(nm, ZPOOL_REWIND_REQUEST) == 0) {
  92                         if (nvpair_value_uint32(elem, &zrpp->zrp_request) == 0)
  93                                 if (zrpp->zrp_request & ~ZPOOL_REWIND_POLICIES)
  94                                         zrpp->zrp_request = ZPOOL_NO_REWIND;
  95                 } else if (strcmp(nm, ZPOOL_REWIND_REQUEST_TXG) == 0) {
  96                         (void) nvpair_value_uint64(elem, &zrpp->zrp_txg);
  97                 } else if (strcmp(nm, ZPOOL_REWIND_META_THRESH) == 0) {
  98                         (void) nvpair_value_uint64(elem, &zrpp->zrp_maxmeta);
  99                 } else if (strcmp(nm, ZPOOL_REWIND_DATA_THRESH) == 0) {
 100                         (void) nvpair_value_uint64(elem, &zrpp->zrp_maxdata);
 101                 }
 102         }
 103         if (zrpp->zrp_request == 0)
 104                 zrpp->zrp_request = ZPOOL_NO_REWIND;
 105 }
 106
 107 typedef struct zfs_version_spa_map {
 108         int     version_zpl;
 109         int     version_spa;
 110 } zfs_version_spa_map_t;
 111
 112 /*
 113  * Keep this table in monotonically increasing version number order.
 114  */
 115 static zfs_version_spa_map_t zfs_version_table[] = {
 116         {ZPL_VERSION_INITIAL, SPA_VERSION_INITIAL},
 117         {ZPL_VERSION_DIRENT_TYPE, SPA_VERSION_INITIAL},
 118         {ZPL_VERSION_FUID, SPA_VERSION_FUID},
 119         {ZPL_VERSION_USERSPACE, SPA_VERSION_USERSPACE},
 120         {ZPL_VERSION_SA, SPA_VERSION_SA},
 121         {0, 0}
 122 };
 123
 124 /*
 125  * Return the max zpl version for a corresponding spa version
 126  * -1 is returned if no mapping exists.
 127  */
 128 int
 129 zfs_zpl_version_map(int spa_version)
 130 {
 131         int i;
 132         int version = -1;
 133
 134         for (i = 0; zfs_version_table[i].version_spa; i++) {
 135                 if (spa_version >= zfs_version_table[i].version_spa)
 136                         version = zfs_version_table[i].version_zpl;
 137         }
 138
 139         return (version);
 140 }
 141
 142 /*
 143  * Return the min spa version for a corresponding spa version
 144  * -1 is returned if no mapping exists.
 145  */
 146 int
 147 zfs_spa_version_map(int zpl_version)
 148 {
 149         int i;
 150         int version = -1;
 151
 152         for (i = 0; zfs_version_table[i].version_zpl; i++) {
 153                 if (zfs_version_table[i].version_zpl >= zpl_version)
 154                         return (zfs_version_table[i].version_spa);
 155         }
 156
 157         return (version);
 158 }
 159
 160 const char *zfs_history_event_names[LOG_END] = {
 161         "invalid event",
 162         "pool create",
 163         "vdev add",
 164         "pool remove",
 165         "pool destroy",
 166         "pool export",
 167         "pool import",
 168         "vdev attach",
 169         "vdev replace",
 170         "vdev detach",
 171         "vdev online",
 172         "vdev offline",
 173         "vdev upgrade",
 174         "pool clear",
 175         "pool scrub",
 176         "pool property set",
 177         "create",
 178         "clone",
 179         "destroy",
 180         "destroy_begin_sync",
 181         "inherit",
 182         "property set",
 183         "quota set",
 184         "permission update",
 185         "permission remove",
 186         "permission who remove",
 187         "promote",
 188         "receive",
 189         "rename",
 190         "reservation set",
 191         "replay_inc_sync",
 192         "replay_full_sync",
 193         "rollback",
 194         "snapshot",
 195         "filesystem version upgrade",
 196         "refquota set",
 197         "refreservation set",
 198         "pool scrub done",
 199         "user hold",
 200         "user release",
 201         "pool split",
 202 };
 203
 204 #if defined(_KERNEL) && defined(HAVE_SPL)
 205 EXPORT_SYMBOL(zfs_allocatable_devs);
 206 EXPORT_SYMBOL(zpool_get_rewind_policy);
 207 EXPORT_SYMBOL(zfs_zpl_version_map);
 208 EXPORT_SYMBOL(zfs_spa_version_map);
 209 EXPORT_SYMBOL(zfs_history_event_names);
 210 #endif