libzfs_config.c revision 168926
1168404Spjd/* 2168404Spjd * CDDL HEADER START 3168404Spjd * 4168404Spjd * The contents of this file are subject to the terms of the 5168404Spjd * Common Development and Distribution License (the "License"). 6168404Spjd * You may not use this file except in compliance with the License. 7168404Spjd * 8168404Spjd * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9168404Spjd * or http://www.opensolaris.org/os/licensing. 10168404Spjd * See the License for the specific language governing permissions 11168404Spjd * and limitations under the License. 12168404Spjd * 13168404Spjd * When distributing Covered Code, include this CDDL HEADER in each 14168404Spjd * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15168404Spjd * If applicable, add the following below this CDDL HEADER, with the 16168404Spjd * fields enclosed by brackets "[]" replaced with your own identifying 17168404Spjd * information: Portions Copyright [yyyy] [name of copyright owner] 18168404Spjd * 19168404Spjd * CDDL HEADER END 20168404Spjd */ 21168404Spjd/* 22168404Spjd * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23168404Spjd * Use is subject to license terms. 24168404Spjd */ 25168404Spjd 26168404Spjd#pragma ident "%Z%%M% %I% %E% SMI" 27168404Spjd 28168404Spjd/* 29168404Spjd * The pool configuration repository is stored in /etc/zfs/zpool.cache as a 30168404Spjd * single packed nvlist. While it would be nice to just read in this 31168404Spjd * file from userland, this wouldn't work from a local zone. So we have to have 32168404Spjd * a zpool ioctl to return the complete configuration for all pools. In the 33168404Spjd * global zone, this will be identical to reading the file and unpacking it in 34168404Spjd * userland. 35168404Spjd */ 36168404Spjd 37168404Spjd#include <errno.h> 38168404Spjd#include <sys/stat.h> 39168404Spjd#include <fcntl.h> 40168404Spjd#include <stddef.h> 41168404Spjd#include <string.h> 42168404Spjd#include <unistd.h> 43168404Spjd#include <libintl.h> 44168404Spjd#include <libuutil.h> 45168404Spjd 46168404Spjd#include "libzfs_impl.h" 47168404Spjd 48168404Spjdtypedef struct config_node { 49168404Spjd char *cn_name; 50168404Spjd nvlist_t *cn_config; 51168404Spjd uu_avl_node_t cn_avl; 52168404Spjd} config_node_t; 53168404Spjd 54168404Spjd/* ARGSUSED */ 55168404Spjdstatic int 56168404Spjdconfig_node_compare(const void *a, const void *b, void *unused) 57168404Spjd{ 58168404Spjd int ret; 59168404Spjd 60168404Spjd const config_node_t *ca = (config_node_t *)a; 61168404Spjd const config_node_t *cb = (config_node_t *)b; 62168404Spjd 63168404Spjd ret = strcmp(ca->cn_name, cb->cn_name); 64168404Spjd 65168404Spjd if (ret < 0) 66168404Spjd return (-1); 67168404Spjd else if (ret > 0) 68168404Spjd return (1); 69168404Spjd else 70168404Spjd return (0); 71168404Spjd} 72168404Spjd 73168404Spjdvoid 74168404Spjdnamespace_clear(libzfs_handle_t *hdl) 75168404Spjd{ 76168404Spjd if (hdl->libzfs_ns_avl) { 77168404Spjd config_node_t *cn; 78168926Spjd void *cookie = NULL; 79168404Spjd 80168926Spjd while ((cn = uu_avl_teardown(hdl->libzfs_ns_avl, 81168926Spjd &cookie)) != NULL) { 82168404Spjd nvlist_free(cn->cn_config); 83168404Spjd free(cn->cn_name); 84168404Spjd free(cn); 85168404Spjd } 86168404Spjd 87168404Spjd uu_avl_destroy(hdl->libzfs_ns_avl); 88168404Spjd hdl->libzfs_ns_avl = NULL; 89168404Spjd } 90168404Spjd 91168404Spjd if (hdl->libzfs_ns_avlpool) { 92168404Spjd uu_avl_pool_destroy(hdl->libzfs_ns_avlpool); 93168404Spjd hdl->libzfs_ns_avlpool = NULL; 94168404Spjd } 95168404Spjd} 96168404Spjd 97168404Spjd/* 98168404Spjd * Loads the pool namespace, or re-loads it if the cache has changed. 99168404Spjd */ 100168404Spjdstatic int 101168404Spjdnamespace_reload(libzfs_handle_t *hdl) 102168404Spjd{ 103168404Spjd nvlist_t *config; 104168404Spjd config_node_t *cn; 105168404Spjd nvpair_t *elem; 106168404Spjd zfs_cmd_t zc = { 0 }; 107168926Spjd void *cookie; 108168404Spjd 109168404Spjd if (hdl->libzfs_ns_gen == 0) { 110168404Spjd /* 111168404Spjd * This is the first time we've accessed the configuration 112168404Spjd * cache. Initialize the AVL tree and then fall through to the 113168404Spjd * common code. 114168404Spjd */ 115168404Spjd if ((hdl->libzfs_ns_avlpool = uu_avl_pool_create("config_pool", 116168404Spjd sizeof (config_node_t), 117168404Spjd offsetof(config_node_t, cn_avl), 118168404Spjd config_node_compare, UU_DEFAULT)) == NULL) 119168404Spjd return (no_memory(hdl)); 120168404Spjd 121168404Spjd if ((hdl->libzfs_ns_avl = uu_avl_create(hdl->libzfs_ns_avlpool, 122168404Spjd NULL, UU_DEFAULT)) == NULL) 123168404Spjd return (no_memory(hdl)); 124168404Spjd } 125168404Spjd 126168404Spjd if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) 127168404Spjd return (-1); 128168404Spjd 129168404Spjd for (;;) { 130168404Spjd zc.zc_cookie = hdl->libzfs_ns_gen; 131168404Spjd if (ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_CONFIGS, &zc) != 0) { 132168404Spjd switch (errno) { 133168404Spjd case EEXIST: 134168404Spjd /* 135168404Spjd * The namespace hasn't changed. 136168404Spjd */ 137168404Spjd zcmd_free_nvlists(&zc); 138168404Spjd return (0); 139168404Spjd 140168404Spjd case ENOMEM: 141168404Spjd if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 142168404Spjd zcmd_free_nvlists(&zc); 143168404Spjd return (-1); 144168404Spjd } 145168404Spjd break; 146168404Spjd 147168404Spjd default: 148168404Spjd zcmd_free_nvlists(&zc); 149168404Spjd return (zfs_standard_error(hdl, errno, 150168404Spjd dgettext(TEXT_DOMAIN, "failed to read " 151168404Spjd "pool configuration"))); 152168404Spjd } 153168404Spjd } else { 154168404Spjd hdl->libzfs_ns_gen = zc.zc_cookie; 155168404Spjd break; 156168404Spjd } 157168404Spjd } 158168404Spjd 159168404Spjd if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) { 160168404Spjd zcmd_free_nvlists(&zc); 161168404Spjd return (-1); 162168404Spjd } 163168404Spjd 164168404Spjd zcmd_free_nvlists(&zc); 165168404Spjd 166168404Spjd /* 167168404Spjd * Clear out any existing configuration information. 168168404Spjd */ 169168926Spjd cookie = NULL; 170168926Spjd while ((cn = uu_avl_teardown(hdl->libzfs_ns_avl, &cookie)) != NULL) { 171168404Spjd nvlist_free(cn->cn_config); 172168404Spjd free(cn->cn_name); 173168404Spjd free(cn); 174168404Spjd } 175168404Spjd 176168404Spjd elem = NULL; 177168404Spjd while ((elem = nvlist_next_nvpair(config, elem)) != NULL) { 178168404Spjd nvlist_t *child; 179168404Spjd uu_avl_index_t where; 180168404Spjd 181168404Spjd if ((cn = zfs_alloc(hdl, sizeof (config_node_t))) == NULL) { 182168404Spjd nvlist_free(config); 183168404Spjd return (-1); 184168404Spjd } 185168404Spjd 186168404Spjd if ((cn->cn_name = zfs_strdup(hdl, 187168404Spjd nvpair_name(elem))) == NULL) { 188168404Spjd free(cn); 189168404Spjd nvlist_free(config); 190168404Spjd return (-1); 191168404Spjd } 192168404Spjd 193168404Spjd verify(nvpair_value_nvlist(elem, &child) == 0); 194168404Spjd if (nvlist_dup(child, &cn->cn_config, 0) != 0) { 195168404Spjd free(cn->cn_name); 196168404Spjd free(cn); 197168404Spjd nvlist_free(config); 198168404Spjd return (no_memory(hdl)); 199168404Spjd } 200168404Spjd verify(uu_avl_find(hdl->libzfs_ns_avl, cn, NULL, &where) 201168404Spjd == NULL); 202168404Spjd 203168404Spjd uu_avl_insert(hdl->libzfs_ns_avl, cn, where); 204168404Spjd } 205168404Spjd 206168404Spjd nvlist_free(config); 207168404Spjd return (0); 208168404Spjd} 209168404Spjd 210168404Spjd/* 211168926Spjd * Retrieve the configuration for the given pool. The configuration is a nvlist 212168404Spjd * describing the vdevs, as well as the statistics associated with each one. 213168404Spjd */ 214168404Spjdnvlist_t * 215168404Spjdzpool_get_config(zpool_handle_t *zhp, nvlist_t **oldconfig) 216168404Spjd{ 217168404Spjd if (oldconfig) 218168404Spjd *oldconfig = zhp->zpool_old_config; 219168404Spjd return (zhp->zpool_config); 220168404Spjd} 221168404Spjd 222168404Spjd/* 223168404Spjd * Refresh the vdev statistics associated with the given pool. This is used in 224168404Spjd * iostat to show configuration changes and determine the delta from the last 225168404Spjd * time the function was called. This function can fail, in case the pool has 226168404Spjd * been destroyed. 227168404Spjd */ 228168404Spjdint 229168404Spjdzpool_refresh_stats(zpool_handle_t *zhp, boolean_t *missing) 230168404Spjd{ 231168404Spjd zfs_cmd_t zc = { 0 }; 232168404Spjd int error; 233168404Spjd nvlist_t *config; 234168404Spjd libzfs_handle_t *hdl = zhp->zpool_hdl; 235168404Spjd 236168404Spjd *missing = B_FALSE; 237168404Spjd (void) strcpy(zc.zc_name, zhp->zpool_name); 238168404Spjd 239168404Spjd if (zhp->zpool_config_size == 0) 240168404Spjd zhp->zpool_config_size = 1 << 16; 241168404Spjd 242168404Spjd if (zcmd_alloc_dst_nvlist(hdl, &zc, zhp->zpool_config_size) != 0) 243168404Spjd return (-1); 244168404Spjd 245168404Spjd for (;;) { 246168404Spjd if (ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_POOL_STATS, 247168404Spjd &zc) == 0) { 248168404Spjd /* 249168404Spjd * The real error is returned in the zc_cookie field. 250168404Spjd */ 251168404Spjd error = zc.zc_cookie; 252168404Spjd break; 253168404Spjd } 254168404Spjd 255168404Spjd if (errno == ENOMEM) { 256168404Spjd if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 257168404Spjd zcmd_free_nvlists(&zc); 258168404Spjd return (-1); 259168404Spjd } 260168404Spjd } else { 261168404Spjd zcmd_free_nvlists(&zc); 262168404Spjd if (errno == ENOENT || errno == EINVAL) 263168404Spjd *missing = B_TRUE; 264168404Spjd zhp->zpool_state = POOL_STATE_UNAVAIL; 265168404Spjd return (0); 266168404Spjd } 267168404Spjd } 268168404Spjd 269168404Spjd if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) { 270168404Spjd zcmd_free_nvlists(&zc); 271168404Spjd return (-1); 272168404Spjd } 273168404Spjd 274168404Spjd zcmd_free_nvlists(&zc); 275168404Spjd 276168404Spjd zhp->zpool_config_size = zc.zc_nvlist_dst_size; 277168404Spjd 278168404Spjd if (zhp->zpool_config != NULL) { 279168404Spjd uint64_t oldtxg, newtxg; 280168404Spjd 281168404Spjd verify(nvlist_lookup_uint64(zhp->zpool_config, 282168404Spjd ZPOOL_CONFIG_POOL_TXG, &oldtxg) == 0); 283168404Spjd verify(nvlist_lookup_uint64(config, 284168404Spjd ZPOOL_CONFIG_POOL_TXG, &newtxg) == 0); 285168404Spjd 286168404Spjd if (zhp->zpool_old_config != NULL) 287168404Spjd nvlist_free(zhp->zpool_old_config); 288168404Spjd 289168404Spjd if (oldtxg != newtxg) { 290168404Spjd nvlist_free(zhp->zpool_config); 291168404Spjd zhp->zpool_old_config = NULL; 292168404Spjd } else { 293168404Spjd zhp->zpool_old_config = zhp->zpool_config; 294168404Spjd } 295168404Spjd } 296168404Spjd 297168404Spjd zhp->zpool_config = config; 298168404Spjd if (error) 299168404Spjd zhp->zpool_state = POOL_STATE_UNAVAIL; 300168404Spjd else 301168404Spjd zhp->zpool_state = POOL_STATE_ACTIVE; 302168404Spjd 303168404Spjd return (0); 304168404Spjd} 305168404Spjd 306168404Spjd/* 307168404Spjd * Iterate over all pools in the system. 308168404Spjd */ 309168404Spjdint 310168404Spjdzpool_iter(libzfs_handle_t *hdl, zpool_iter_f func, void *data) 311168404Spjd{ 312168404Spjd config_node_t *cn; 313168404Spjd zpool_handle_t *zhp; 314168404Spjd int ret; 315168404Spjd 316168404Spjd if (namespace_reload(hdl) != 0) 317168404Spjd return (-1); 318168404Spjd 319168404Spjd for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL; 320168404Spjd cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) { 321168404Spjd 322168404Spjd if (zpool_open_silent(hdl, cn->cn_name, &zhp) != 0) 323168404Spjd return (-1); 324168404Spjd 325168404Spjd if (zhp == NULL) 326168404Spjd continue; 327168404Spjd 328168404Spjd if ((ret = func(zhp, data)) != 0) 329168404Spjd return (ret); 330168404Spjd } 331168404Spjd 332168404Spjd return (0); 333168404Spjd} 334168404Spjd 335168404Spjd/* 336168404Spjd * Iterate over root datasets, calling the given function for each. The zfs 337168404Spjd * handle passed each time must be explicitly closed by the callback. 338168404Spjd */ 339168404Spjdint 340168404Spjdzfs_iter_root(libzfs_handle_t *hdl, zfs_iter_f func, void *data) 341168404Spjd{ 342168404Spjd config_node_t *cn; 343168404Spjd zfs_handle_t *zhp; 344168404Spjd int ret; 345168404Spjd 346168404Spjd if (namespace_reload(hdl) != 0) 347168404Spjd return (-1); 348168404Spjd 349168404Spjd for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL; 350168404Spjd cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) { 351168404Spjd 352168404Spjd if ((zhp = make_dataset_handle(hdl, cn->cn_name)) == NULL) 353168404Spjd continue; 354168404Spjd 355168404Spjd if ((ret = func(zhp, data)) != 0) 356168404Spjd return (ret); 357168404Spjd } 358168404Spjd 359168404Spjd return (0); 360168404Spjd} 361