]>
Commit | Line | Data |
---|---|---|
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 | config_node_t *cn; | |
78 | void *cookie = NULL; | |
79 | ||
80 | while ((cn = uu_avl_teardown(hdl->libzfs_ns_avl, | |
81 | &cookie)) != NULL) { | |
82 | nvlist_free(cn->cn_config); | |
83 | free(cn->cn_name); | |
84 | free(cn); | |
85 | } | |
86 | ||
87 | uu_avl_destroy(hdl->libzfs_ns_avl); | |
88 | hdl->libzfs_ns_avl = NULL; | |
89 | } | |
90 | ||
91 | if (hdl->libzfs_ns_avlpool) { | |
92 | uu_avl_pool_destroy(hdl->libzfs_ns_avlpool); | |
93 | hdl->libzfs_ns_avlpool = NULL; | |
94 | } | |
95 | } | |
96 | ||
97 | /* | |
98 | * Loads the pool namespace, or re-loads it if the cache has changed. | |
99 | */ | |
100 | static int | |
101 | namespace_reload(libzfs_handle_t *hdl) | |
102 | { | |
103 | nvlist_t *config; | |
104 | config_node_t *cn; | |
105 | nvpair_t *elem; | |
106 | zfs_cmd_t zc = { 0 }; | |
107 | void *cookie; | |
108 | ||
109 | if (hdl->libzfs_ns_gen == 0) { | |
110 | /* | |
111 | * This is the first time we've accessed the configuration | |
112 | * cache. Initialize the AVL tree and then fall through to the | |
113 | * common code. | |
114 | */ | |
115 | if ((hdl->libzfs_ns_avlpool = uu_avl_pool_create("config_pool", | |
116 | sizeof (config_node_t), | |
117 | offsetof(config_node_t, cn_avl), | |
118 | config_node_compare, UU_DEFAULT)) == NULL) | |
119 | return (no_memory(hdl)); | |
120 | ||
121 | if ((hdl->libzfs_ns_avl = uu_avl_create(hdl->libzfs_ns_avlpool, | |
122 | NULL, UU_DEFAULT)) == NULL) | |
123 | return (no_memory(hdl)); | |
124 | } | |
125 | ||
126 | if (zcmd_alloc_dst_nvlist(hdl, &zc, 0) != 0) | |
127 | return (-1); | |
128 | ||
129 | for (;;) { | |
130 | zc.zc_cookie = hdl->libzfs_ns_gen; | |
131 | if (ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_CONFIGS, &zc) != 0) { | |
132 | switch (errno) { | |
133 | case EEXIST: | |
134 | /* | |
135 | * The namespace hasn't changed. | |
136 | */ | |
137 | zcmd_free_nvlists(&zc); | |
138 | return (0); | |
139 | ||
140 | case ENOMEM: | |
141 | if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { | |
142 | zcmd_free_nvlists(&zc); | |
143 | return (-1); | |
144 | } | |
145 | break; | |
146 | ||
147 | default: | |
148 | zcmd_free_nvlists(&zc); | |
149 | return (zfs_standard_error(hdl, errno, | |
150 | dgettext(TEXT_DOMAIN, "failed to read " | |
151 | "pool configuration"))); | |
152 | } | |
153 | } else { | |
154 | hdl->libzfs_ns_gen = zc.zc_cookie; | |
155 | break; | |
156 | } | |
157 | } | |
158 | ||
159 | if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) { | |
160 | zcmd_free_nvlists(&zc); | |
161 | return (-1); | |
162 | } | |
163 | ||
164 | zcmd_free_nvlists(&zc); | |
165 | ||
166 | /* | |
167 | * Clear out any existing configuration information. | |
168 | */ | |
169 | cookie = NULL; | |
170 | while ((cn = uu_avl_teardown(hdl->libzfs_ns_avl, &cookie)) != NULL) { | |
171 | nvlist_free(cn->cn_config); | |
172 | free(cn->cn_name); | |
173 | free(cn); | |
174 | } | |
175 | ||
176 | elem = NULL; | |
177 | while ((elem = nvlist_next_nvpair(config, elem)) != NULL) { | |
178 | nvlist_t *child; | |
179 | uu_avl_index_t where; | |
180 | ||
181 | if ((cn = zfs_alloc(hdl, sizeof (config_node_t))) == NULL) { | |
182 | nvlist_free(config); | |
183 | return (-1); | |
184 | } | |
185 | ||
186 | if ((cn->cn_name = zfs_strdup(hdl, | |
187 | nvpair_name(elem))) == NULL) { | |
188 | free(cn); | |
189 | nvlist_free(config); | |
190 | return (-1); | |
191 | } | |
192 | ||
193 | verify(nvpair_value_nvlist(elem, &child) == 0); | |
194 | if (nvlist_dup(child, &cn->cn_config, 0) != 0) { | |
195 | free(cn->cn_name); | |
196 | free(cn); | |
197 | nvlist_free(config); | |
198 | return (no_memory(hdl)); | |
199 | } | |
200 | verify(uu_avl_find(hdl->libzfs_ns_avl, cn, NULL, &where) | |
201 | == NULL); | |
202 | ||
203 | uu_avl_insert(hdl->libzfs_ns_avl, cn, where); | |
204 | } | |
205 | ||
206 | nvlist_free(config); | |
207 | return (0); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Retrieve the configuration for the given pool. The configuration is a nvlist | |
212 | * describing the vdevs, as well as the statistics associated with each one. | |
213 | */ | |
214 | nvlist_t * | |
215 | zpool_get_config(zpool_handle_t *zhp, nvlist_t **oldconfig) | |
216 | { | |
217 | if (oldconfig) | |
218 | *oldconfig = zhp->zpool_old_config; | |
219 | return (zhp->zpool_config); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Refresh the vdev statistics associated with the given pool. This is used in | |
224 | * iostat to show configuration changes and determine the delta from the last | |
225 | * time the function was called. This function can fail, in case the pool has | |
226 | * been destroyed. | |
227 | */ | |
228 | int | |
229 | zpool_refresh_stats(zpool_handle_t *zhp, boolean_t *missing) | |
230 | { | |
231 | zfs_cmd_t zc = { 0 }; | |
232 | int error; | |
233 | nvlist_t *config; | |
234 | libzfs_handle_t *hdl = zhp->zpool_hdl; | |
235 | ||
236 | *missing = B_FALSE; | |
237 | (void) strcpy(zc.zc_name, zhp->zpool_name); | |
238 | ||
239 | if (zhp->zpool_config_size == 0) | |
240 | zhp->zpool_config_size = 1 << 16; | |
241 | ||
242 | if (zcmd_alloc_dst_nvlist(hdl, &zc, zhp->zpool_config_size) != 0) | |
243 | return (-1); | |
244 | ||
245 | for (;;) { | |
246 | if (ioctl(zhp->zpool_hdl->libzfs_fd, ZFS_IOC_POOL_STATS, | |
247 | &zc) == 0) { | |
248 | /* | |
249 | * The real error is returned in the zc_cookie field. | |
250 | */ | |
251 | error = zc.zc_cookie; | |
252 | break; | |
253 | } | |
254 | ||
255 | if (errno == ENOMEM) { | |
256 | if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { | |
257 | zcmd_free_nvlists(&zc); | |
258 | return (-1); | |
259 | } | |
260 | } else { | |
261 | zcmd_free_nvlists(&zc); | |
262 | if (errno == ENOENT || errno == EINVAL) | |
263 | *missing = B_TRUE; | |
264 | zhp->zpool_state = POOL_STATE_UNAVAIL; | |
265 | return (0); | |
266 | } | |
267 | } | |
268 | ||
269 | if (zcmd_read_dst_nvlist(hdl, &zc, &config) != 0) { | |
270 | zcmd_free_nvlists(&zc); | |
271 | return (-1); | |
272 | } | |
273 | ||
274 | zcmd_free_nvlists(&zc); | |
275 | ||
276 | zhp->zpool_config_size = zc.zc_nvlist_dst_size; | |
277 | ||
278 | if (zhp->zpool_config != NULL) { | |
279 | uint64_t oldtxg, newtxg; | |
280 | ||
281 | verify(nvlist_lookup_uint64(zhp->zpool_config, | |
282 | ZPOOL_CONFIG_POOL_TXG, &oldtxg) == 0); | |
283 | verify(nvlist_lookup_uint64(config, | |
284 | ZPOOL_CONFIG_POOL_TXG, &newtxg) == 0); | |
285 | ||
286 | if (zhp->zpool_old_config != NULL) | |
287 | nvlist_free(zhp->zpool_old_config); | |
288 | ||
289 | if (oldtxg != newtxg) { | |
290 | nvlist_free(zhp->zpool_config); | |
291 | zhp->zpool_old_config = NULL; | |
292 | } else { | |
293 | zhp->zpool_old_config = zhp->zpool_config; | |
294 | } | |
295 | } | |
296 | ||
297 | zhp->zpool_config = config; | |
298 | if (error) | |
299 | zhp->zpool_state = POOL_STATE_UNAVAIL; | |
300 | else | |
301 | zhp->zpool_state = POOL_STATE_ACTIVE; | |
302 | ||
303 | return (0); | |
304 | } | |
305 | ||
306 | /* | |
307 | * Iterate over all pools in the system. | |
308 | */ | |
309 | int | |
310 | zpool_iter(libzfs_handle_t *hdl, zpool_iter_f func, void *data) | |
311 | { | |
312 | config_node_t *cn; | |
313 | zpool_handle_t *zhp; | |
314 | int ret; | |
315 | ||
316 | if (namespace_reload(hdl) != 0) | |
317 | return (-1); | |
318 | ||
319 | for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL; | |
320 | cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) { | |
321 | ||
322 | if (zpool_open_silent(hdl, cn->cn_name, &zhp) != 0) | |
323 | return (-1); | |
324 | ||
325 | if (zhp == NULL) | |
326 | continue; | |
327 | ||
328 | if ((ret = func(zhp, data)) != 0) | |
329 | return (ret); | |
330 | } | |
331 | ||
332 | return (0); | |
333 | } | |
334 | ||
335 | /* | |
336 | * Iterate over root datasets, calling the given function for each. The zfs | |
337 | * handle passed each time must be explicitly closed by the callback. | |
338 | */ | |
339 | int | |
340 | zfs_iter_root(libzfs_handle_t *hdl, zfs_iter_f func, void *data) | |
341 | { | |
342 | config_node_t *cn; | |
343 | zfs_handle_t *zhp; | |
344 | int ret; | |
345 | ||
346 | if (namespace_reload(hdl) != 0) | |
347 | return (-1); | |
348 | ||
349 | for (cn = uu_avl_first(hdl->libzfs_ns_avl); cn != NULL; | |
350 | cn = uu_avl_next(hdl->libzfs_ns_avl, cn)) { | |
351 | ||
352 | if ((zhp = make_dataset_handle(hdl, cn->cn_name)) == NULL) | |
353 | continue; | |
354 | ||
355 | if ((ret = func(zhp, data)) != 0) | |
356 | return (ret); | |
357 | } | |
358 | ||
359 | return (0); | |
360 | } |