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34dc7c2f BB |
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 | /* | |
428870ff | 22 | * Copyright 2009 Sun Microsystems, Inc. All rights reserved. |
34dc7c2f BB |
23 | * Use is subject to license terms. |
24 | */ | |
25 | ||
34dc7c2f BB |
26 | /* |
27 | * The pool configuration repository is stored in /etc/zfs/zpool.cache as a | |
28 | * single packed nvlist. While it would be nice to just read in this | |
29 | * file from userland, this wouldn't work from a local zone. So we have to have | |
30 | * a zpool ioctl to return the complete configuration for all pools. In the | |
31 | * global zone, this will be identical to reading the file and unpacking it in | |
32 | * userland. | |
33 | */ | |
34 | ||
35 | #include <errno.h> | |
36 | #include <sys/stat.h> | |
37 | #include <fcntl.h> | |
38 | #include <stddef.h> | |
39 | #include <string.h> | |
40 | #include <unistd.h> | |
41 | #include <libintl.h> | |
42 | #include <libuutil.h> | |
43 | ||
44 | #include "libzfs_impl.h" | |
45 | ||
46 | typedef struct config_node { | |
47 | char *cn_name; | |
48 | nvlist_t *cn_config; | |
49 | uu_avl_node_t cn_avl; | |
50 | } config_node_t; | |
51 | ||
52 | /* ARGSUSED */ | |
53 | static int | |
54 | config_node_compare(const void *a, const void *b, void *unused) | |
55 | { | |
56 | int ret; | |
57 | ||
58 | const config_node_t *ca = (config_node_t *)a; | |
59 | const config_node_t *cb = (config_node_t *)b; | |
60 | ||
61 | ret = strcmp(ca->cn_name, cb->cn_name); | |
62 | ||
63 | if (ret < 0) | |
64 | return (-1); | |
65 | else if (ret > 0) | |
66 | return (1); | |
67 | else | |
68 | return (0); | |
69 | } | |
70 | ||
71 | void | |
72 | namespace_clear(libzfs_handle_t *hdl) | |
73 | { | |
74 | if (hdl->libzfs_ns_avl) { | |
75 | config_node_t *cn; | |
76 | void *cookie = NULL; | |
77 | ||
78 | while ((cn = uu_avl_teardown(hdl->libzfs_ns_avl, | |
79 | &cookie)) != NULL) { | |
80 | nvlist_free(cn->cn_config); | |
81 | free(cn->cn_name); | |
82 | free(cn); | |
83 | } | |
84 | ||
85 | uu_avl_destroy(hdl->libzfs_ns_avl); | |
86 | hdl->libzfs_ns_avl = NULL; | |
87 | } | |
88 | ||
89 | if (hdl->libzfs_ns_avlpool) { | |
90 | uu_avl_pool_destroy(hdl->libzfs_ns_avlpool); | |
91 | hdl->libzfs_ns_avlpool = NULL; | |
92 | } | |
93 | } | |
94 | ||
95 | /* | |
96 | * Loads the pool namespace, or re-loads it if the cache has changed. | |
97 | */ | |
98 | static int | |
99 | namespace_reload(libzfs_handle_t *hdl) | |
100 | { | |
101 | nvlist_t *config; | |
102 | config_node_t *cn; | |
103 | nvpair_t *elem; | |
2598c001 | 104 | zfs_cmd_t zc = { "\0", "\0", "\0", "\0", 0 }; |
34dc7c2f BB |
105 | void *cookie; |
106 | ||
107 | if (hdl->libzfs_ns_gen == 0) { | |
108 | /* | |
109 | * This is the first time we've accessed the configuration | |
110 | * cache. Initialize the AVL tree and then fall through to the | |
111 | * common code. | |
112 | */ | |
113 | if ((hdl->libzfs_ns_avlpool = uu_avl_pool_create("config_pool", | |
114 | sizeof (config_node_t), | |
115 | offsetof(config_node_t, cn_avl), | |
116 | config_node_compare, UU_DEFAULT)) == NULL) | |
117 | return (no_memory(hdl)); | |
118 | ||
119 | if ((hdl->libzfs_ns_avl = uu_avl_create(hdl->libzfs_ns_avlpool, | |
120 | NULL, UU_DEFAULT)) == NULL) | |
121 | return (no_memory(hdl)); | |
122 | } | |
123 | ||
124 | if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) | |
125 | return (-1); | |
126 | ||
127 | for (;;) { | |
128 | zc.zc_cookie = hdl->libzfs_ns_gen; | |
129 | if (ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_CONFIGS, &zc) != 0) { | |
130 | switch (errno) { | |
131 | case EEXIST: | |
132 | /* | |
133 | * The namespace hasn't changed. | |
134 | */ | |
135 | zcmd_free_nvlists(&zc); | |
136 | return (0); | |
137 | ||
138 | case ENOMEM: | |
139 | if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { | |
140 | zcmd_free_nvlists(&zc); | |
141 | return (-1); | |
142 | } | |
143 | break; | |
144 | ||
145 | default: | |
146 | zcmd_free_nvlists(&zc); | |
147 | return (zfs_standard_error(hdl, errno, | |
148 | dgettext(TEXT_DOMAIN, "failed to read " | |
149 | "pool configuration"))); | |
150 | } | |
151 | } else { | |
152 | hdl->libzfs_ns_gen = zc.zc_cookie; | |
153 | break; | |
154 | } | |
155 | } | |
156 | ||
157 | if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) { | |
158 | zcmd_free_nvlists(&zc); | |
159 | return (-1); | |
160 | } | |
161 | ||
162 | zcmd_free_nvlists(&zc); | |
163 | ||
164 | /* | |
165 | * Clear out any existing configuration information. | |
166 | */ | |
167 | cookie = NULL; | |
168 | while ((cn = uu_avl_teardown(hdl->libzfs_ns_avl, &cookie)) != NULL) { | |
169 | nvlist_free(cn->cn_config); | |
170 | free(cn->cn_name); | |
171 | free(cn); | |
172 | } | |
173 | ||
174 | elem = NULL; | |
175 | while ((elem = nvlist_next_nvpair(config, elem)) != NULL) { | |
176 | nvlist_t *child; | |
177 | uu_avl_index_t where; | |
178 | ||
179 | if ((cn = zfs_alloc(hdl, sizeof (config_node_t))) == NULL) { | |
180 | nvlist_free(config); | |
181 | return (-1); | |
182 | } | |
183 | ||
184 | if ((cn->cn_name = zfs_strdup(hdl, | |
185 | nvpair_name(elem))) == NULL) { | |
186 | free(cn); | |
187 | nvlist_free(config); | |
188 | return (-1); | |
189 | } | |
190 | ||
191 | verify(nvpair_value_nvlist(elem, &child) == 0); | |
192 | if (nvlist_dup(child, &cn->cn_config, 0) != 0) { | |
193 | free(cn->cn_name); | |
194 | free(cn); | |
195 | nvlist_free(config); | |
196 | return (no_memory(hdl)); | |
197 | } | |
198 | verify(uu_avl_find(hdl->libzfs_ns_avl, cn, NULL, &where) | |
199 | == NULL); | |
200 | ||
201 | uu_avl_insert(hdl->libzfs_ns_avl, cn, where); | |
202 | } | |
203 | ||
204 | nvlist_free(config); | |
205 | return (0); | |
206 | } | |
207 | ||
208 | /* | |
209 | * Retrieve the configuration for the given pool. The configuration is a nvlist | |
210 | * describing the vdevs, as well as the statistics associated with each one. | |
211 | */ | |
212 | nvlist_t * | |
213 | zpool_get_config(zpool_handle_t *zhp, nvlist_t **oldconfig) | |
214 | { | |
215 | if (oldconfig) | |
216 | *oldconfig = zhp->zpool_old_config; | |
217 | return (zhp->zpool_config); | |
218 | } | |
219 | ||
220 | /* | |
221 | * Refresh the vdev statistics associated with the given pool. This is used in | |
222 | * iostat to show configuration changes and determine the delta from the last | |
223 | * time the function was called. This function can fail, in case the pool has | |
224 | * been destroyed. | |
225 | */ | |
226 | int | |
227 | zpool_refresh_stats(zpool_handle_t *zhp, boolean_t *missing) | |
228 | { | |
2598c001 | 229 | zfs_cmd_t zc = { "\0", "\0", "\0", "\0", 0 }; |
34dc7c2f BB |
230 | int error; |
231 | nvlist_t *config; | |
232 | libzfs_handle_t *hdl = zhp->zpool_hdl; | |
233 | ||
234 | *missing = B_FALSE; | |
235 | (void) strcpy(zc.zc_name, zhp->zpool_name); | |
236 | ||
237 | if (zhp->zpool_config_size == 0) | |
238 | zhp->zpool_config_size = 1 << 16; | |
239 | ||
240 | if (zcmd_alloc_dst_nvlist(hdl, &zc, zhp->zpool_config_size) != 0) | |
241 | return (-1); | |
242 | ||
243 | for (;;) { | |
244 | if (ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_POOL_STATS, | |
245 | &zc) == 0) { | |
246 | /* | |
247 | * The real error is returned in the zc_cookie field. | |
248 | */ | |
249 | error = zc.zc_cookie; | |
250 | break; | |
251 | } | |
252 | ||
253 | if (errno == ENOMEM) { | |
254 | if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { | |
255 | zcmd_free_nvlists(&zc); | |
256 | return (-1); | |
257 | } | |
258 | } else { | |
259 | zcmd_free_nvlists(&zc); | |
260 | if (errno == ENOENT || errno == EINVAL) | |
261 | *missing = B_TRUE; | |
262 | zhp->zpool_state = POOL_STATE_UNAVAIL; | |
263 | return (0); | |
264 | } | |
265 | } | |
266 | ||
267 | if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) { | |
268 | zcmd_free_nvlists(&zc); | |
269 | return (-1); | |
270 | } | |
271 | ||
272 | zcmd_free_nvlists(&zc); | |
273 | ||
274 | zhp->zpool_config_size = zc.zc_nvlist_dst_size; | |
275 | ||
276 | if (zhp->zpool_config != NULL) { | |
277 | uint64_t oldtxg, newtxg; | |
278 | ||
279 | verify(nvlist_lookup_uint64(zhp->zpool_config, | |
280 | ZPOOL_CONFIG_POOL_TXG, &oldtxg) == 0); | |
281 | verify(nvlist_lookup_uint64(config, | |
282 | ZPOOL_CONFIG_POOL_TXG, &newtxg) == 0); | |
283 | ||
284 | if (zhp->zpool_old_config != NULL) | |
285 | nvlist_free(zhp->zpool_old_config); | |
286 | ||
287 | if (oldtxg != newtxg) { | |
288 | nvlist_free(zhp->zpool_config); | |
289 | zhp->zpool_old_config = NULL; | |
290 | } else { | |
291 | zhp->zpool_old_config = zhp->zpool_config; | |
292 | } | |
293 | } | |
294 | ||
295 | zhp->zpool_config = config; | |
296 | if (error) | |
297 | zhp->zpool_state = POOL_STATE_UNAVAIL; | |
298 | else | |
299 | zhp->zpool_state = POOL_STATE_ACTIVE; | |
300 | ||
301 | return (0); | |
302 | } | |
303 | ||
304 | /* | |
305 | * Iterate over all pools in the system. | |
306 | */ | |
307 | int | |
308 | zpool_iter(libzfs_handle_t *hdl, zpool_iter_f func, void *data) | |
309 | { | |
310 | config_node_t *cn; | |
311 | zpool_handle_t *zhp; | |
312 | int ret; | |
313 | ||
428870ff BB |
314 | /* |
315 | * If someone makes a recursive call to zpool_iter(), we want to avoid | |
316 | * refreshing the namespace because that will invalidate the parent | |
317 | * context. We allow recursive calls, but simply re-use the same | |
318 | * namespace AVL tree. | |
319 | */ | |
320 | if (!hdl->libzfs_pool_iter && namespace_reload(hdl) != 0) | |
34dc7c2f BB |
321 | return (-1); |
322 | ||
428870ff | 323 | hdl->libzfs_pool_iter++; |
34dc7c2f BB |
324 | for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL; |
325 | cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) { | |
326 | ||
428870ff BB |
327 | if (zpool_open_silent(hdl, cn->cn_name, &zhp) != 0) { |
328 | hdl->libzfs_pool_iter--; | |
34dc7c2f | 329 | return (-1); |
428870ff | 330 | } |
34dc7c2f BB |
331 | |
332 | if (zhp == NULL) | |
333 | continue; | |
334 | ||
428870ff BB |
335 | if ((ret = func(zhp, data)) != 0) { |
336 | hdl->libzfs_pool_iter--; | |
34dc7c2f | 337 | return (ret); |
428870ff | 338 | } |
34dc7c2f | 339 | } |
428870ff | 340 | hdl->libzfs_pool_iter--; |
34dc7c2f BB |
341 | |
342 | return (0); | |
343 | } | |
344 | ||
345 | /* | |
346 | * Iterate over root datasets, calling the given function for each. The zfs | |
347 | * handle passed each time must be explicitly closed by the callback. | |
348 | */ | |
349 | int | |
350 | zfs_iter_root(libzfs_handle_t *hdl, zfs_iter_f func, void *data) | |
351 | { | |
352 | config_node_t *cn; | |
353 | zfs_handle_t *zhp; | |
354 | int ret; | |
355 | ||
356 | if (namespace_reload(hdl) != 0) | |
357 | return (-1); | |
358 | ||
359 | for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL; | |
360 | cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) { | |
361 | ||
362 | if ((zhp = make_dataset_handle(hdl, cn->cn_name)) == NULL) | |
363 | continue; | |
364 | ||
365 | if ((ret = func(zhp, data)) != 0) | |
366 | return (ret); | |
367 | } | |
368 | ||
369 | return (0); | |
370 | } |