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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * The pool configuration repository is stored in /etc/zfs/zpool.cache as a 30 * single packed nvlist. While it would be nice to just read in this 31 * file from userland, this wouldn't work from a local zone. So we have to have 32 * a zpool ioctl to return the complete configuration for all pools. In the 33 * global zone, this will be identical to reading the file and unpacking it in 34 * userland. 35 */ 36 37 #include <errno.h> 38 #include <sys/stat.h> 39 #include <fcntl.h> 40 #include <stddef.h> 41 #include <string.h> 42 #include <unistd.h> 43 #include <libintl.h> 44 #include <libuutil.h> 45 46 #include "libzfs_impl.h" 47 48 typedef struct config_node { 49 char *cn_name; 50 nvlist_t *cn_config; 51 uu_avl_node_t cn_avl; 52 } config_node_t; 53 54 /* ARGSUSED */ 55 static int 56 config_node_compare(const void *a, const void *b, void *unused) 57 { 58 int ret; 59 60 const config_node_t *ca = (config_node_t *)a; 61 const config_node_t *cb = (config_node_t *)b; 62 63 ret = strcmp(ca->cn_name, cb->cn_name); 64 65 if (ret < 0) 66 return (-1); 67 else if (ret > 0) 68 return (1); 69 else 70 return (0); 71 } 72 73 void 74 namespace_clear(libzfs_handle_t *hdl) 75 { 76 if (hdl->libzfs_ns_avl) { 77 uu_avl_walk_t *walk; 78 config_node_t *cn; 79 80 if ((walk = uu_avl_walk_start(hdl->libzfs_ns_avl, 81 UU_WALK_ROBUST)) == NULL) 82 return; 83 84 while ((cn = uu_avl_walk_next(walk)) != NULL) { 85 uu_avl_remove(hdl->libzfs_ns_avl, cn); 86 nvlist_free(cn->cn_config); 87 free(cn->cn_name); 88 free(cn); 89 } 90 91 uu_avl_walk_end(walk); 92 93 uu_avl_destroy(hdl->libzfs_ns_avl); 94 hdl->libzfs_ns_avl = NULL; 95 } 96 97 if (hdl->libzfs_ns_avlpool) { 98 uu_avl_pool_destroy(hdl->libzfs_ns_avlpool); 99 hdl->libzfs_ns_avlpool = NULL; 100 } 101 } 102 103 /* 104 * Loads the pool namespace, or re-loads it if the cache has changed. 105 */ 106 static int 107 namespace_reload(libzfs_handle_t *hdl) 108 { 109 nvlist_t *config; 110 config_node_t *cn; 111 nvpair_t *elem; 112 zfs_cmd_t zc = { 0 }; 113 uu_avl_walk_t *walk; 114 115 if (hdl->libzfs_ns_gen == 0) { 116 /* 117 * This is the first time we've accessed the configuration 118 * cache. Initialize the AVL tree and then fall through to the 119 * common code. 120 */ 121 if ((hdl->libzfs_ns_avlpool = uu_avl_pool_create("config_pool", 122 sizeof (config_node_t), 123 offsetof(config_node_t, cn_avl), 124 config_node_compare, UU_DEFAULT)) == NULL) 125 return (no_memory(hdl)); 126 127 if ((hdl->libzfs_ns_avl = uu_avl_create(hdl->libzfs_ns_avlpool, 128 NULL, UU_DEFAULT)) == NULL) 129 return (no_memory(hdl)); 130 } 131 132 if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) 133 return (-1); 134 135 for (;;) { 136 zc.zc_cookie = hdl->libzfs_ns_gen; 137 if (ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_CONFIGS, &zc) != 0) { 138 switch (errno) { 139 case EEXIST: 140 /* 141 * The namespace hasn't changed. 142 */ 143 zcmd_free_nvlists(&zc); 144 return (0); 145 146 case ENOMEM: 147 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 148 zcmd_free_nvlists(&zc); 149 return (-1); 150 } 151 break; 152 153 default: 154 zcmd_free_nvlists(&zc); 155 return (zfs_standard_error(hdl, errno, 156 dgettext(TEXT_DOMAIN, "failed to read " 157 "pool configuration"))); 158 } 159 } else { 160 hdl->libzfs_ns_gen = zc.zc_cookie; 161 break; 162 } 163 } 164 165 if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) { 166 zcmd_free_nvlists(&zc); 167 return (-1); 168 } 169 170 zcmd_free_nvlists(&zc); 171 172 /* 173 * Clear out any existing configuration information. 174 */ 175 if ((walk = uu_avl_walk_start(hdl->libzfs_ns_avl, 176 UU_WALK_ROBUST)) == NULL) { 177 nvlist_free(config); 178 return (no_memory(hdl)); 179 } 180 181 while ((cn = uu_avl_walk_next(walk)) != NULL) { 182 uu_avl_remove(hdl->libzfs_ns_avl, cn); 183 nvlist_free(cn->cn_config); 184 free(cn->cn_name); 185 free(cn); 186 } 187 188 uu_avl_walk_end(walk); 189 190 elem = NULL; 191 while ((elem = nvlist_next_nvpair(config, elem)) != NULL) { 192 nvlist_t *child; 193 uu_avl_index_t where; 194 195 if ((cn = zfs_alloc(hdl, sizeof (config_node_t))) == NULL) { 196 nvlist_free(config); 197 return (-1); 198 } 199 200 if ((cn->cn_name = zfs_strdup(hdl, 201 nvpair_name(elem))) == NULL) { 202 free(cn); 203 nvlist_free(config); 204 return (-1); 205 } 206 207 verify(nvpair_value_nvlist(elem, &child) == 0); 208 if (nvlist_dup(child, &cn->cn_config, 0) != 0) { 209 free(cn->cn_name); 210 free(cn); 211 nvlist_free(config); 212 return (no_memory(hdl)); 213 } 214 verify(uu_avl_find(hdl->libzfs_ns_avl, cn, NULL, &where) 215 == NULL); 216 217 uu_avl_insert(hdl->libzfs_ns_avl, cn, where); 218 } 219 220 nvlist_free(config); 221 return (0); 222 } 223 224 /* 225 * Retrive the configuration for the given pool. The configuration is a nvlist 226 * describing the vdevs, as well as the statistics associated with each one. 227 */ 228 nvlist_t * 229 zpool_get_config(zpool_handle_t *zhp, nvlist_t **oldconfig) 230 { 231 if (oldconfig) 232 *oldconfig = zhp->zpool_old_config; 233 return (zhp->zpool_config); 234 } 235 236 /* 237 * Refresh the vdev statistics associated with the given pool. This is used in 238 * iostat to show configuration changes and determine the delta from the last 239 * time the function was called. This function can fail, in case the pool has 240 * been destroyed. 241 */ 242 int 243 zpool_refresh_stats(zpool_handle_t *zhp, boolean_t *missing) 244 { 245 zfs_cmd_t zc = { 0 }; 246 int error; 247 nvlist_t *config; 248 libzfs_handle_t *hdl = zhp->zpool_hdl; 249 250 *missing = B_FALSE; 251 (void) strcpy(zc.zc_name, zhp->zpool_name); 252 253 if (zhp->zpool_config_size == 0) 254 zhp->zpool_config_size = 1 << 16; 255 256 if (zcmd_alloc_dst_nvlist(hdl, &zc, zhp->zpool_config_size) != 0) 257 return (-1); 258 259 for (;;) { 260 if (ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_POOL_STATS, 261 &zc) == 0) { 262 /* 263 * The real error is returned in the zc_cookie field. 264 */ 265 error = zc.zc_cookie; 266 break; 267 } 268 269 if (errno == ENOMEM) { 270 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 271 zcmd_free_nvlists(&zc); 272 return (-1); 273 } 274 } else { 275 zcmd_free_nvlists(&zc); 276 if (errno == ENOENT || errno == EINVAL) 277 *missing = B_TRUE; 278 zhp->zpool_state = POOL_STATE_UNAVAIL; 279 return (0); 280 } 281 } 282 283 if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) { 284 zcmd_free_nvlists(&zc); 285 return (-1); 286 } 287 288 zcmd_free_nvlists(&zc); 289 290 zhp->zpool_config_size = zc.zc_nvlist_dst_size; 291 292 if (zhp->zpool_config != NULL) { 293 uint64_t oldtxg, newtxg; 294 295 verify(nvlist_lookup_uint64(zhp->zpool_config, 296 ZPOOL_CONFIG_POOL_TXG, &oldtxg) == 0); 297 verify(nvlist_lookup_uint64(config, 298 ZPOOL_CONFIG_POOL_TXG, &newtxg) == 0); 299 300 if (zhp->zpool_old_config != NULL) 301 nvlist_free(zhp->zpool_old_config); 302 303 if (oldtxg != newtxg) { 304 nvlist_free(zhp->zpool_config); 305 zhp->zpool_old_config = NULL; 306 } else { 307 zhp->zpool_old_config = zhp->zpool_config; 308 } 309 } 310 311 zhp->zpool_config = config; 312 if (error) 313 zhp->zpool_state = POOL_STATE_UNAVAIL; 314 else 315 zhp->zpool_state = POOL_STATE_ACTIVE; 316 317 return (0); 318 } 319 320 /* 321 * Iterate over all pools in the system. 322 */ 323 int 324 zpool_iter(libzfs_handle_t *hdl, zpool_iter_f func, void *data) 325 { 326 config_node_t *cn; 327 zpool_handle_t *zhp; 328 int ret; 329 330 if (namespace_reload(hdl) != 0) 331 return (-1); 332 333 for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL; 334 cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) { 335 336 if (zpool_open_silent(hdl, cn->cn_name, &zhp) != 0) 337 return (-1); 338 339 if (zhp == NULL) 340 continue; 341 342 if ((ret = func(zhp, data)) != 0) 343 return (ret); 344 } 345 346 return (0); 347 } 348 349 /* 350 * Iterate over root datasets, calling the given function for each. The zfs 351 * handle passed each time must be explicitly closed by the callback. 352 */ 353 int 354 zfs_iter_root(libzfs_handle_t *hdl, zfs_iter_f func, void *data) 355 { 356 config_node_t *cn; 357 zfs_handle_t *zhp; 358 int ret; 359 360 if (namespace_reload(hdl) != 0) 361 return (-1); 362 363 for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL; 364 cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) { 365 366 if ((zhp = make_dataset_handle(hdl, cn->cn_name)) == NULL) 367 continue; 368 369 if ((ret = func(zhp, data)) != 0) 370 return (ret); 371 } 372 373 return (0); 374 } 375