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8907f444 CB |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Daniel Lezcano <daniel.lezcano at free.fr> | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
d38dd64a CB |
24 | #ifndef _GNU_SOURCE |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
3ef1df7c | 27 | #include <errno.h> |
8907f444 | 28 | #include <stdint.h> |
3d2ae1e2 | 29 | #include <stdio.h> |
8907f444 CB |
30 | #include <stdlib.h> |
31 | #include <string.h> | |
32 | #include <sys/mount.h> | |
3d2ae1e2 | 33 | #include <unistd.h> |
8907f444 | 34 | |
8907f444 CB |
35 | #include "config.h" |
36 | #include "log.h" | |
3ef1df7c | 37 | #include "parse.h" |
28d832c4 CB |
38 | #include "rsync.h" |
39 | #include "storage.h" | |
8907f444 | 40 | #include "utils.h" |
28d832c4 | 41 | #include "zfs.h" |
8907f444 | 42 | |
10bc1861 | 43 | lxc_log_define(zfs, lxc); |
8907f444 | 44 | |
3ef1df7c CB |
45 | struct zfs_args { |
46 | const char *dataset; | |
47 | const char *snapshot; | |
48 | const char *options; | |
49 | void *argv; | |
50 | }; | |
51 | ||
52 | int zfs_detect_exec_wrapper(void *data) | |
53 | { | |
54 | struct zfs_args *args = data; | |
55 | ||
56 | execlp("zfs", "zfs", "get", "type", "-H", "-o", "name", args->dataset, | |
57 | (char *)NULL); | |
58 | ||
59 | return -1; | |
60 | } | |
61 | ||
62 | int zfs_create_exec_wrapper(void *args) | |
63 | { | |
64 | struct zfs_args *zfs_args = args; | |
65 | ||
66 | execvp("zfs", zfs_args->argv); | |
67 | ||
68 | return -1; | |
69 | } | |
70 | ||
71 | int zfs_delete_exec_wrapper(void *args) | |
72 | { | |
73 | struct zfs_args *zfs_args = args; | |
74 | ||
75 | execlp("zfs", "zfs", "destroy", "-r", zfs_args->dataset, (char *)NULL); | |
76 | ||
77 | return -1; | |
78 | } | |
79 | ||
80 | int zfs_snapshot_exec_wrapper(void *args) | |
81 | { | |
82 | struct zfs_args *zfs_args = args; | |
83 | ||
84 | execlp("zfs", "zfs", "snapshot", "-r", zfs_args->snapshot, (char *)NULL); | |
85 | ||
86 | return -1; | |
87 | } | |
88 | ||
89 | int zfs_clone_exec_wrapper(void *args) | |
90 | { | |
91 | struct zfs_args *zfs_args = args; | |
92 | ||
93 | execlp("zfs", "zfs", "clone", "-p", "-o", "canmount=noauto", "-o", | |
94 | zfs_args->options, zfs_args->snapshot, zfs_args->dataset, | |
95 | (char *)NULL); | |
96 | ||
97 | return -1; | |
98 | } | |
99 | ||
100 | int zfs_get_parent_snapshot_exec_wrapper(void *args) | |
101 | { | |
102 | struct zfs_args *zfs_args = args; | |
103 | ||
104 | execlp("zfs", "zfs", "get", "origin", "-o", "value", "-H", | |
105 | zfs_args->dataset, (char *)NULL); | |
106 | ||
107 | return -1; | |
108 | } | |
8907f444 | 109 | |
3d2ae1e2 | 110 | static bool zfs_list_entry(const char *path, char *output, size_t inlen) |
8907f444 CB |
111 | { |
112 | struct lxc_popen_FILE *f; | |
3d2ae1e2 | 113 | bool found = false; |
8907f444 CB |
114 | |
115 | f = lxc_popen("zfs list 2> /dev/null"); | |
116 | if (f == NULL) { | |
117 | SYSERROR("popen failed"); | |
3d2ae1e2 | 118 | return false; |
8907f444 CB |
119 | } |
120 | ||
121 | while (fgets(output, inlen, f->f)) { | |
122 | if (strstr(output, path)) { | |
3d2ae1e2 | 123 | found = true; |
8907f444 CB |
124 | break; |
125 | } | |
126 | } | |
3d2ae1e2 | 127 | (void)lxc_pclose(f); |
8907f444 CB |
128 | |
129 | return found; | |
130 | } | |
131 | ||
3d2ae1e2 | 132 | bool zfs_detect(const char *path) |
8907f444 | 133 | { |
3ef1df7c CB |
134 | int ret; |
135 | char *dataset; | |
136 | struct zfs_args cmd_args = {0}; | |
137 | char cmd_output[MAXPATHLEN] = {0}; | |
138 | ||
f7ac4459 | 139 | if (!strncmp(path, "zfs:", 4)) |
3d2ae1e2 | 140 | return true; |
f7ac4459 | 141 | |
3ef1df7c CB |
142 | /* This is a legacy zfs setup where the rootfs path |
143 | * "<lxcpath>/<lxcname>/rootfs" is given. | |
144 | */ | |
145 | if (*path == '/') { | |
146 | bool found; | |
147 | char *output = malloc(LXC_LOG_BUFFER_SIZE); | |
148 | ||
149 | if (!output) { | |
150 | ERROR("out of memory"); | |
151 | return false; | |
152 | } | |
153 | ||
154 | found = zfs_list_entry(path, output, LXC_LOG_BUFFER_SIZE); | |
155 | free(output); | |
156 | return found; | |
157 | } | |
8907f444 | 158 | |
3ef1df7c CB |
159 | cmd_args.dataset = path; |
160 | ret = run_command(cmd_output, sizeof(cmd_output), | |
161 | zfs_detect_exec_wrapper, (void *)&cmd_args); | |
162 | if (ret < 0) { | |
163 | ERROR("Failed to detect zfs dataset \"%s\": %s", path, cmd_output); | |
3d2ae1e2 | 164 | return false; |
8907f444 CB |
165 | } |
166 | ||
3ef1df7c CB |
167 | if (cmd_output[0] == '\0') |
168 | return false; | |
8907f444 | 169 | |
3ef1df7c CB |
170 | /* remove any possible leading and trailing whitespace */ |
171 | dataset = cmd_output; | |
172 | dataset += lxc_char_left_gc(dataset, strlen(dataset)); | |
173 | dataset[lxc_char_right_gc(dataset, strlen(dataset))] = '\0'; | |
174 | ||
175 | if (strcmp(dataset, path)) | |
176 | return false; | |
177 | ||
178 | return true; | |
8907f444 CB |
179 | } |
180 | ||
10bc1861 | 181 | int zfs_mount(struct lxc_storage *bdev) |
8907f444 | 182 | { |
db46c213 | 183 | int ret; |
3ef1df7c | 184 | size_t oldlen, newlen, totallen; |
41dc7155 CB |
185 | char *mntdata, *tmp; |
186 | const char *src; | |
db46c213 | 187 | unsigned long mntflags; |
3ef1df7c | 188 | char cmd_output[MAXPATHLEN] = {0}; |
db46c213 | 189 | |
8907f444 CB |
190 | if (strcmp(bdev->type, "zfs")) |
191 | return -22; | |
192 | ||
193 | if (!bdev->src || !bdev->dest) | |
194 | return -22; | |
195 | ||
3ef1df7c CB |
196 | ret = parse_mntopts(bdev->mntopts, &mntflags, &mntdata); |
197 | if (ret < 0) { | |
198 | ERROR("Failed to parse mount options"); | |
8907f444 CB |
199 | free(mntdata); |
200 | return -22; | |
201 | } | |
202 | ||
3ef1df7c CB |
203 | /* This is a legacy zfs setup where the rootfs path |
204 | * "<lxcpath>/<lxcname>/rootfs" is given and we do a bind-mount. | |
205 | */ | |
db46c213 | 206 | src = lxc_storage_get_path(bdev->src, bdev->type); |
3ef1df7c CB |
207 | if (*src == '/') { |
208 | bool found; | |
209 | ||
210 | found = zfs_list_entry(src, cmd_output, sizeof(cmd_output)); | |
211 | if (!found) { | |
212 | ERROR("Failed to find zfs entry \"%s\"", src); | |
213 | return -1; | |
214 | } | |
215 | ||
216 | tmp = strchr(cmd_output, ' '); | |
217 | if (!tmp) { | |
218 | ERROR("Failed to detect zfs dataset associated with " | |
219 | "\"%s\"", src); | |
220 | return -1; | |
221 | } | |
222 | *tmp = '\0'; | |
223 | src = cmd_output; | |
224 | } | |
225 | ||
226 | /* ',' | |
227 | * + | |
228 | * strlen("zfsutil") | |
229 | * + | |
230 | * ',' | |
231 | * + | |
232 | * strlen(mntpoint=) | |
233 | * + | |
234 | * strlen(src) | |
235 | * + | |
236 | * '\0' | |
237 | */ | |
238 | newlen = 1 + 7 + 1 + 9 + strlen(src) + 1; | |
239 | oldlen = mntdata ? strlen(mntdata) : 0; | |
240 | totallen = (newlen + oldlen); | |
241 | tmp = realloc(mntdata, totallen); | |
242 | if (!tmp) { | |
243 | ERROR("Failed to reallocate memory"); | |
244 | free(mntdata); | |
245 | return -1; | |
246 | } | |
247 | mntdata = tmp; | |
248 | ||
249 | ret = snprintf((mntdata + oldlen), newlen, ",zfsutil,mntpoint=%s", src); | |
250 | if (ret < 0 || (size_t)ret >= newlen) { | |
251 | ERROR("Failed to create string"); | |
252 | free(mntdata); | |
253 | return -1; | |
254 | } | |
255 | ||
256 | ret = mount(src, bdev->dest, "zfs", mntflags, mntdata); | |
8907f444 | 257 | free(mntdata); |
3ef1df7c CB |
258 | if (ret < 0 && errno != EBUSY) { |
259 | SYSERROR("Failed to mount \"%s\" on \"%s\"", src, bdev->dest); | |
260 | return -1; | |
261 | } | |
8907f444 | 262 | |
3ef1df7c CB |
263 | TRACE("Mounted \"%s\" on \"%s\"", src, bdev->dest); |
264 | return 0; | |
8907f444 CB |
265 | } |
266 | ||
10bc1861 | 267 | int zfs_umount(struct lxc_storage *bdev) |
8907f444 | 268 | { |
3ef1df7c CB |
269 | int ret; |
270 | ||
8907f444 CB |
271 | if (strcmp(bdev->type, "zfs")) |
272 | return -22; | |
273 | ||
274 | if (!bdev->src || !bdev->dest) | |
275 | return -22; | |
276 | ||
3ef1df7c CB |
277 | ret = umount(bdev->dest); |
278 | if (ret < 0) | |
279 | SYSERROR("Failed to unmount \"%s\"", bdev->dest); | |
280 | else | |
281 | TRACE("Unmounted \"%s\"", bdev->dest); | |
282 | ||
283 | return ret; | |
8907f444 CB |
284 | } |
285 | ||
10bc1861 CB |
286 | bool zfs_copy(struct lxc_conf *conf, struct lxc_storage *orig, |
287 | struct lxc_storage *new, uint64_t newsize) | |
8907f444 | 288 | { |
8907f444 | 289 | int ret; |
3ef1df7c CB |
290 | char cmd_output[MAXPATHLEN], option[MAXPATHLEN]; |
291 | struct rsync_data data = {0, 0}; | |
292 | struct zfs_args cmd_args = {0}; | |
41dc7155 CB |
293 | const char *argv[] = {"zfs", /* 0 */ |
294 | "create", /* 1 */ | |
295 | "-o", "", /* 2, 3 */ | |
296 | "-o", "canmount=noauto", /* 4, 5 */ | |
297 | "-p", /* 6 */ | |
298 | "", /* 7 */ | |
299 | NULL}; | |
3ef1df7c CB |
300 | |
301 | /* mountpoint */ | |
302 | ret = snprintf(option, MAXPATHLEN, "mountpoint=%s", new->dest); | |
303 | if (ret < 0 || ret >= MAXPATHLEN) { | |
304 | ERROR("Failed to create string"); | |
305 | return false; | |
306 | } | |
307 | argv[3] = option; | |
308 | argv[7] = lxc_storage_get_path(new->src, new->type); | |
8907f444 | 309 | |
3ef1df7c CB |
310 | cmd_args.argv = argv; |
311 | ret = run_command(cmd_output, sizeof(cmd_output), | |
312 | zfs_create_exec_wrapper, (void *)&cmd_args); | |
313 | if (ret < 0) { | |
314 | ERROR("Failed to create zfs dataset \"%s\": %s", new->src, cmd_output); | |
315 | return false; | |
316 | } else if (cmd_output[0] != '\0') { | |
317 | INFO("Created zfs dataset \"%s\": %s", new->src, cmd_output); | |
8907f444 | 318 | } else { |
3ef1df7c | 319 | TRACE("Created zfs dataset \"%s\"", new->src); |
8907f444 CB |
320 | } |
321 | ||
3ef1df7c CB |
322 | ret = mkdir_p(new->dest, 0755); |
323 | if (ret < 0 && errno != EEXIST) { | |
324 | SYSERROR("Failed to create directory \"%s\"", new->dest); | |
325 | return false; | |
326 | } | |
8907f444 | 327 | |
3ef1df7c CB |
328 | data.orig = orig; |
329 | data.new = new; | |
330 | ret = run_command(cmd_output, sizeof(cmd_output), | |
17a367d8 | 331 | lxc_storage_rsync_exec_wrapper, (void *)&data); |
3ef1df7c CB |
332 | if (ret < 0) { |
333 | ERROR("Failed to rsync from \"%s\" into \"%s\": %s", orig->dest, | |
334 | new->dest, cmd_output); | |
335 | return false; | |
336 | } | |
337 | TRACE("Rsynced from \"%s\" to \"%s\"", orig->dest, new->dest); | |
8907f444 | 338 | |
3ef1df7c CB |
339 | return true; |
340 | } | |
8907f444 | 341 | |
3ef1df7c | 342 | /* create read-only snapshot and create a clone from it */ |
10bc1861 CB |
343 | bool zfs_snapshot(struct lxc_conf *conf, struct lxc_storage *orig, |
344 | struct lxc_storage *new, uint64_t newsize) | |
3ef1df7c CB |
345 | { |
346 | int ret; | |
347 | size_t snapshot_len, len; | |
41dc7155 CB |
348 | char *tmp, *snap_name, *snapshot; |
349 | const char *orig_src; | |
3ef1df7c CB |
350 | struct zfs_args cmd_args = {0}; |
351 | char cmd_output[MAXPATHLEN] = {0}, option[MAXPATHLEN]; | |
352 | ||
353 | orig_src = lxc_storage_get_path(orig->src, orig->type); | |
354 | if (*orig_src == '/') { | |
355 | bool found; | |
356 | ||
357 | found = zfs_list_entry(orig_src, cmd_output, sizeof(cmd_output)); | |
358 | if (!found) { | |
359 | ERROR("Failed to find zfs entry \"%s\"", orig_src); | |
360 | return false; | |
8907f444 | 361 | } |
8907f444 | 362 | |
3ef1df7c CB |
363 | tmp = strchr(cmd_output, ' '); |
364 | if (!tmp) { | |
365 | ERROR("Failed to detect zfs dataset associated with " | |
366 | "\"%s\"", orig_src); | |
367 | return false; | |
8907f444 | 368 | } |
3ef1df7c CB |
369 | *tmp = '\0'; |
370 | orig_src = cmd_output; | |
371 | } | |
372 | ||
373 | snapshot = strdup(orig_src); | |
374 | if (!snapshot) { | |
375 | ERROR("Failed to duplicate string \"%s\"", orig_src); | |
376 | return false; | |
377 | } | |
378 | ||
379 | snap_name = strrchr(new->src, '/'); | |
380 | if (!snap_name) { | |
381 | ERROR("Failed to detect \"/\" in \"%s\"", new->src); | |
382 | free(snapshot); | |
383 | return false; | |
384 | } | |
385 | snap_name++; | |
386 | ||
387 | /* strlen(snapshot) | |
388 | * + | |
389 | * @ | |
390 | * + | |
391 | * strlen(cname) | |
392 | * + | |
393 | * \0 | |
394 | */ | |
395 | snapshot_len = strlen(snapshot); | |
396 | len = snapshot_len + 1 + strlen(snap_name) + 1; | |
397 | tmp = realloc(snapshot, len); | |
398 | if (!tmp) { | |
399 | ERROR("Failed to reallocate memory"); | |
400 | free(snapshot); | |
401 | return false; | |
402 | } | |
403 | snapshot = tmp; | |
404 | ||
405 | len -= snapshot_len; | |
406 | ret = snprintf(snapshot + snapshot_len, len, "@%s", snap_name); | |
407 | if (ret < 0 || ret >= len) { | |
408 | ERROR("Failed to create string"); | |
409 | free(snapshot); | |
410 | return false; | |
8907f444 | 411 | } |
3ef1df7c CB |
412 | |
413 | cmd_args.snapshot = snapshot; | |
414 | ret = run_command(cmd_output, sizeof(cmd_output), | |
415 | zfs_snapshot_exec_wrapper, (void *)&cmd_args); | |
416 | if (ret < 0) { | |
417 | ERROR("Failed to create zfs snapshot \"%s\": %s", snapshot, cmd_output); | |
418 | free(snapshot); | |
419 | return false; | |
420 | } else if (cmd_output[0] != '\0') { | |
421 | INFO("Created zfs snapshot \"%s\": %s", snapshot, cmd_output); | |
422 | } else { | |
423 | TRACE("Created zfs snapshot \"%s\"", snapshot); | |
424 | } | |
425 | ||
426 | ret = snprintf(option, MAXPATHLEN, "mountpoint=%s", new->dest); | |
427 | if (ret < 0 || ret >= MAXPATHLEN) { | |
428 | ERROR("Failed to create string"); | |
429 | free(snapshot); | |
430 | return -1; | |
431 | } | |
432 | ||
433 | cmd_args.dataset = lxc_storage_get_path(new->src, new->type); | |
434 | cmd_args.snapshot = snapshot; | |
435 | cmd_args.options = option; | |
436 | ret = run_command(cmd_output, sizeof(cmd_output), | |
437 | zfs_clone_exec_wrapper, (void *)&cmd_args); | |
438 | if (ret < 0) | |
439 | ERROR("Failed to create zfs dataset \"%s\": %s", new->src, cmd_output); | |
440 | else if (cmd_output[0] != '\0') | |
441 | INFO("Created zfs dataset \"%s\": %s", new->src, cmd_output); | |
442 | else | |
443 | TRACE("Created zfs dataset \"%s\"", new->src); | |
444 | ||
445 | free(snapshot); | |
446 | return true; | |
8907f444 CB |
447 | } |
448 | ||
10bc1861 CB |
449 | int zfs_clonepaths(struct lxc_storage *orig, struct lxc_storage *new, |
450 | const char *oldname, const char *cname, const char *oldpath, | |
451 | const char *lxcpath, int snap, uint64_t newsize, | |
452 | struct lxc_conf *conf) | |
8907f444 | 453 | { |
3ef1df7c | 454 | int ret; |
41dc7155 CB |
455 | char *dataset, *tmp; |
456 | const char *orig_src; | |
3ef1df7c CB |
457 | size_t dataset_len, len; |
458 | char cmd_output[MAXPATHLEN] = {0}; | |
8907f444 CB |
459 | |
460 | if (!orig->src || !orig->dest) | |
461 | return -1; | |
462 | ||
463 | if (snap && strcmp(orig->type, "zfs")) { | |
3d2ae1e2 CB |
464 | ERROR("zfs snapshot from %s backing store is not supported", |
465 | orig->type); | |
8907f444 CB |
466 | return -1; |
467 | } | |
468 | ||
3ef1df7c CB |
469 | orig_src = lxc_storage_get_path(orig->src, orig->type); |
470 | if (!strcmp(orig->type, "zfs")) { | |
471 | size_t len; | |
472 | if (*orig_src == '/') { | |
473 | bool found; | |
474 | ||
475 | found = zfs_list_entry(orig_src, cmd_output, | |
476 | sizeof(cmd_output)); | |
477 | if (!found) { | |
478 | ERROR("Failed to find zfs entry \"%s\"", orig_src); | |
479 | return -1; | |
480 | } | |
481 | ||
482 | tmp = strchr(cmd_output, ' '); | |
483 | if (!tmp) { | |
484 | ERROR("Failed to detect zfs dataset associated " | |
485 | "with \"%s\"", orig_src); | |
486 | return -1; | |
487 | } | |
488 | *tmp = '\0'; | |
489 | orig_src = cmd_output; | |
490 | } | |
491 | ||
492 | tmp = strrchr(orig_src, '/'); | |
493 | if (!tmp) { | |
494 | ERROR("Failed to detect \"/\" in \"%s\"", orig_src); | |
495 | return -1; | |
496 | } | |
497 | ||
498 | len = tmp - orig_src; | |
499 | dataset = strndup(orig_src, len); | |
500 | if (!dataset) { | |
501 | ERROR("Failed to duplicate string \"%zu\" " | |
502 | "bytes of string \"%s\"", len, orig_src); | |
503 | return -1; | |
504 | } | |
505 | } else { | |
506 | tmp = (char *)lxc_global_config_value("lxc.bdev.zfs.root"); | |
507 | if (!tmp) { | |
508 | ERROR("The \"lxc.bdev.zfs.root\" property is not set"); | |
509 | return -1; | |
510 | } | |
511 | ||
512 | dataset = strdup(tmp); | |
513 | if (!dataset) { | |
514 | ERROR("Failed to duplicate string \"%s\"", tmp); | |
515 | return -1; | |
516 | } | |
517 | } | |
518 | ||
519 | /* strlen("zfs:") = 4 | |
520 | * + | |
521 | * strlen(dataset) | |
522 | * + | |
523 | * / = 1 | |
524 | * + | |
525 | * strlen(cname) | |
526 | * + | |
527 | * \0 | |
528 | */ | |
529 | dataset_len = strlen(dataset); | |
530 | len = 4 + dataset_len + 1 + strlen(cname) + 1; | |
531 | new->src = realloc(dataset, len); | |
532 | if (!new->src) { | |
533 | ERROR("Failed to reallocate memory"); | |
534 | free(dataset); | |
535 | return -1; | |
536 | } | |
537 | memmove(new->src + 4, new->src, dataset_len); | |
538 | memmove(new->src, "zfs:", 4); | |
539 | ||
540 | len -= dataset_len - 4; | |
541 | ret = snprintf(new->src + dataset_len + 4, len, "/%s", cname); | |
542 | if (ret < 0 || ret >= len) { | |
543 | ERROR("Failed to create string"); | |
8907f444 | 544 | return -1; |
3ef1df7c | 545 | } |
8907f444 | 546 | |
3ef1df7c CB |
547 | /* strlen(lxcpath) |
548 | * + | |
549 | * / | |
550 | * + | |
551 | * strlen(cname) | |
552 | * + | |
553 | * / | |
554 | * + | |
555 | * strlen("rootfs") | |
556 | * + | |
557 | * \0 | |
558 | */ | |
559 | len = strlen(lxcpath) + 1 + strlen(cname) + 1 + strlen("rootfs") + 1; | |
560 | new->dest = malloc(len); | |
561 | if (!new->dest) { | |
562 | ERROR("Failed to allocate memory"); | |
8907f444 | 563 | return -1; |
3ef1df7c | 564 | } |
8907f444 | 565 | |
3ef1df7c CB |
566 | ret = snprintf(new->dest, len, "%s/%s/rootfs", lxcpath, cname); |
567 | if (ret < 0 || ret >= len) { | |
568 | ERROR("Failed to create string \"%s/%s/rootfs\"", lxcpath, cname); | |
8907f444 | 569 | return -1; |
3ef1df7c | 570 | } |
8907f444 | 571 | |
3ef1df7c CB |
572 | ret = mkdir_p(new->dest, 0755); |
573 | if (ret < 0 && errno != EEXIST) { | |
574 | SYSERROR("Failed to create directory \"%s\"", new->dest); | |
575 | return -1; | |
576 | } | |
577 | ||
578 | return 0; | |
8907f444 CB |
579 | } |
580 | ||
10bc1861 | 581 | int zfs_destroy(struct lxc_storage *orig) |
8907f444 | 582 | { |
3ef1df7c | 583 | int ret; |
41dc7155 CB |
584 | char *dataset, *tmp; |
585 | const char *src; | |
3ef1df7c CB |
586 | bool found; |
587 | char *parent_snapshot = NULL; | |
588 | struct zfs_args cmd_args = {0}; | |
589 | char cmd_output[MAXPATHLEN] = {0}; | |
590 | ||
591 | src = lxc_storage_get_path(orig->src, orig->type); | |
592 | ||
593 | /* This is a legacy zfs setup where the rootfs path | |
594 | * "<lxcpath>/<lxcname>/rootfs" is given. | |
595 | */ | |
596 | if (*src == '/') { | |
597 | char *tmp; | |
598 | ||
599 | found = zfs_list_entry(src, cmd_output, sizeof(cmd_output)); | |
600 | if (!found) { | |
601 | ERROR("Failed to find zfs entry \"%s\"", orig->src); | |
602 | return -1; | |
603 | } | |
604 | ||
605 | tmp = strchr(cmd_output, ' '); | |
606 | if (!tmp) { | |
607 | ERROR("Failed to detect zfs dataset associated with " | |
608 | "\"%s\"", cmd_output); | |
609 | return -1; | |
610 | } | |
611 | *tmp = '\0'; | |
612 | dataset = cmd_output; | |
613 | } else { | |
614 | cmd_args.dataset = src; | |
615 | ret = run_command(cmd_output, sizeof(cmd_output), | |
616 | zfs_detect_exec_wrapper, (void *)&cmd_args); | |
617 | if (ret < 0) { | |
618 | ERROR("Failed to detect zfs dataset \"%s\": %s", src, | |
619 | cmd_output); | |
620 | return -1; | |
621 | } | |
622 | ||
623 | if (cmd_output[0] == '\0') { | |
624 | ERROR("Failed to detect zfs dataset \"%s\"", src); | |
625 | return -1; | |
626 | } | |
8907f444 | 627 | |
3ef1df7c CB |
628 | /* remove any possible leading and trailing whitespace */ |
629 | dataset = cmd_output; | |
630 | dataset += lxc_char_left_gc(dataset, strlen(dataset)); | |
631 | dataset[lxc_char_right_gc(dataset, strlen(dataset))] = '\0'; | |
632 | ||
633 | if (strcmp(dataset, src)) { | |
634 | ERROR("Detected dataset \"%s\" does not match expected " | |
635 | "dataset \"%s\"", dataset, src); | |
636 | return -1; | |
637 | } | |
638 | } | |
639 | ||
640 | cmd_args.dataset = strdup(dataset); | |
641 | if (!cmd_args.dataset) { | |
642 | ERROR("Failed to duplicate string \"%s\"", dataset); | |
8907f444 | 643 | return -1; |
3ef1df7c | 644 | } |
8907f444 | 645 | |
3ef1df7c CB |
646 | ret = run_command(cmd_output, sizeof(cmd_output), |
647 | zfs_get_parent_snapshot_exec_wrapper, | |
648 | (void *)&cmd_args); | |
649 | if (ret < 0) { | |
650 | ERROR("Failed to retrieve parent snapshot of zfs dataset " | |
651 | "\"%s\": %s", dataset, cmd_output); | |
652 | free((void *)cmd_args.dataset); | |
8907f444 | 653 | return -1; |
3ef1df7c CB |
654 | } else { |
655 | INFO("Retrieved parent snapshot of zfs dataset \"%s\": %s", src, | |
656 | cmd_output); | |
657 | } | |
658 | ||
659 | /* remove any possible leading and trailing whitespace */ | |
660 | tmp = cmd_output; | |
661 | tmp += lxc_char_left_gc(tmp, strlen(tmp)); | |
662 | tmp[lxc_char_right_gc(tmp, strlen(tmp))] = '\0'; | |
663 | ||
664 | /* check whether the dataset has a parent snapshot */ | |
665 | if (*tmp != '-' && *(tmp + 1) != '\0') { | |
666 | parent_snapshot = strdup(tmp); | |
667 | if (!parent_snapshot) { | |
668 | ERROR("Failed to duplicate string \"%s\"", tmp); | |
669 | free((void *)cmd_args.dataset); | |
670 | return -1; | |
671 | } | |
8907f444 CB |
672 | } |
673 | ||
3ef1df7c CB |
674 | /* delete dataset */ |
675 | ret = run_command(cmd_output, sizeof(cmd_output), | |
676 | zfs_delete_exec_wrapper, (void *)&cmd_args); | |
677 | if (ret < 0) { | |
678 | ERROR("Failed to delete zfs dataset \"%s\": %s", dataset, | |
679 | cmd_output); | |
680 | free((void *)cmd_args.dataset); | |
681 | free(parent_snapshot); | |
8907f444 | 682 | return -1; |
3ef1df7c CB |
683 | } else if (cmd_output[0] != '\0') { |
684 | INFO("Deleted zfs dataset \"%s\": %s", src, cmd_output); | |
685 | } else { | |
686 | INFO("Deleted zfs dataset \"%s\"", src); | |
687 | } | |
8907f444 | 688 | |
3ef1df7c | 689 | free((void *)cmd_args.dataset); |
8907f444 | 690 | |
3ef1df7c CB |
691 | /* Not a clone so nothing more to do. */ |
692 | if (!parent_snapshot) | |
693 | return 0; | |
db46c213 | 694 | |
3ef1df7c CB |
695 | /* delete parent snapshot */ |
696 | cmd_args.dataset = parent_snapshot; | |
697 | ret = run_command(cmd_output, sizeof(cmd_output), | |
698 | zfs_delete_exec_wrapper, (void *)&cmd_args); | |
699 | if (ret < 0) | |
700 | ERROR("Failed to delete zfs snapshot \"%s\": %s", dataset, cmd_output); | |
701 | else if (cmd_output[0] != '\0') | |
702 | INFO("Deleted zfs snapshot \"%s\": %s", src, cmd_output); | |
703 | else | |
704 | INFO("Deleted zfs snapshot \"%s\"", src); | |
db46c213 | 705 | |
3ef1df7c CB |
706 | free((void *)cmd_args.dataset); |
707 | return ret; | |
db46c213 CB |
708 | } |
709 | ||
10bc1861 | 710 | int zfs_create(struct lxc_storage *bdev, const char *dest, const char *n, |
3d2ae1e2 | 711 | struct bdev_specs *specs) |
8907f444 CB |
712 | { |
713 | const char *zfsroot; | |
8907f444 | 714 | int ret; |
db46c213 | 715 | size_t len; |
3ef1df7c CB |
716 | struct zfs_args cmd_args = {0}; |
717 | char cmd_output[MAXPATHLEN], option[MAXPATHLEN]; | |
41dc7155 CB |
718 | const char *argv[] = {"zfs", /* 0 */ |
719 | "create", /* 1 */ | |
720 | "-o", "", /* 2, 3 */ | |
721 | "-o", "canmount=noauto", /* 4, 5 */ | |
722 | "-p", /* 6 */ | |
723 | "", /* 7 */ | |
724 | NULL}; | |
8907f444 CB |
725 | |
726 | if (!specs || !specs->zfs.zfsroot) | |
727 | zfsroot = lxc_global_config_value("lxc.bdev.zfs.root"); | |
728 | else | |
729 | zfsroot = specs->zfs.zfsroot; | |
730 | ||
db46c213 CB |
731 | bdev->dest = strdup(dest); |
732 | if (!bdev->dest) { | |
3ef1df7c | 733 | ERROR("Failed to duplicate string \"%s\"", dest); |
8907f444 CB |
734 | return -1; |
735 | } | |
db46c213 | 736 | |
3ef1df7c | 737 | len = strlen(zfsroot) + 1 + strlen(n) + 1; |
db46c213 CB |
738 | /* strlen("zfs:") */ |
739 | len += 4; | |
740 | bdev->src = malloc(len); | |
3ef1df7c CB |
741 | if (!bdev->src) { |
742 | ERROR("Failed to allocate memory"); | |
8907f444 | 743 | return -1; |
3ef1df7c | 744 | } |
8907f444 | 745 | |
3ef1df7c CB |
746 | ret = snprintf(bdev->src, len, "zfs:%s/%s", zfsroot, n); |
747 | if (ret < 0 || ret >= len) { | |
748 | ERROR("Failed to create string"); | |
8907f444 | 749 | return -1; |
3ef1df7c CB |
750 | } |
751 | argv[7] = lxc_storage_get_path(bdev->src, bdev->type); | |
8907f444 | 752 | |
3ef1df7c CB |
753 | ret = snprintf(option, MAXPATHLEN, "mountpoint=%s", bdev->dest); |
754 | if (ret < 0 || ret >= MAXPATHLEN) { | |
755 | ERROR("Failed to create string"); | |
db46c213 | 756 | return -1; |
3ef1df7c CB |
757 | } |
758 | argv[3] = option; | |
8907f444 | 759 | |
3ef1df7c | 760 | cmd_args.argv = argv; |
db46c213 CB |
761 | ret = run_command(cmd_output, sizeof(cmd_output), |
762 | zfs_create_exec_wrapper, (void *)&cmd_args); | |
24f84f1e | 763 | if (ret < 0) { |
3ef1df7c | 764 | ERROR("Failed to create zfs dataset \"%s\": %s", bdev->src, cmd_output); |
24f84f1e CB |
765 | return -1; |
766 | } else if (cmd_output[0] != '\0') { | |
3ef1df7c | 767 | INFO("Created zfs dataset \"%s\": %s", bdev->src, cmd_output); |
24f84f1e | 768 | } else { |
3ef1df7c | 769 | TRACE("Created zfs dataset \"%s\"", bdev->src); |
24f84f1e | 770 | } |
3ef1df7c CB |
771 | |
772 | ret = mkdir_p(bdev->dest, 0755); | |
773 | if (ret < 0 && errno != EEXIST) { | |
774 | SYSERROR("Failed to create directory \"%s\"", bdev->dest); | |
775 | return -1; | |
776 | } | |
777 | ||
db46c213 | 778 | return ret; |
8907f444 | 779 | } |