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2b9cbd53 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 | ||
24 | #define _GNU_SOURCE | |
25 | #define __STDC_FORMAT_MACROS /* Required for PRIu64 to work. */ | |
26 | #include <inttypes.h> /* Required for PRIu64 to work. */ | |
27 | #include <stdint.h> | |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
31 | #include <unistd.h> | |
ce831b3b | 32 | #include <sys/sysmacros.h> |
23c9c64d | 33 | #include <sys/wait.h> |
2b9cbd53 CB |
34 | |
35 | #include "bdev.h" | |
af6824fc | 36 | #include "config.h" |
2b9cbd53 CB |
37 | #include "log.h" |
38 | #include "lxclvm.h" | |
f2d5a09d | 39 | #include "storage_utils.h" |
2b9cbd53 CB |
40 | #include "utils.h" |
41 | ||
af6824fc ST |
42 | /* major()/minor() */ |
43 | #ifdef MAJOR_IN_MKDEV | |
44 | # include <sys/mkdev.h> | |
45 | #endif | |
af6824fc | 46 | |
2b9cbd53 CB |
47 | lxc_log_define(lxclvm, lxc); |
48 | ||
49 | extern char *dir_new_path(char *src, const char *oldname, const char *name, | |
02b5e381 | 50 | const char *oldpath, const char *lxcpath); |
2b9cbd53 | 51 | |
02b5e381 CB |
52 | /* Path must be '/dev/$vg/$lv', $vg must be an existing VG, and $lv must not yet |
53 | * exist. This function will attempt to create /dev/$vg/$lv of size $size. If | |
54 | * thinpool is specified, we'll check for it's existence and if it's a valid | |
55 | * thin pool, and if so, we'll create the requested lv from that thin pool. | |
56 | */ | |
57 | static int do_lvm_create(const char *path, uint64_t size, const char *thinpool) | |
2b9cbd53 CB |
58 | { |
59 | int ret, pid, len; | |
60 | char sz[24], *pathdup, *vg, *lv, *tp = NULL; | |
61 | ||
62 | if ((pid = fork()) < 0) { | |
63 | SYSERROR("failed fork"); | |
64 | return -1; | |
65 | } | |
66 | if (pid > 0) | |
67 | return wait_for_pid(pid); | |
68 | ||
69 | // specify bytes to lvcreate | |
70 | ret = snprintf(sz, 24, "%"PRIu64"b", size); | |
71 | if (ret < 0 || ret >= 24) | |
72 | exit(EXIT_FAILURE); | |
73 | ||
74 | pathdup = strdup(path); | |
75 | if (!pathdup) | |
76 | exit(EXIT_FAILURE); | |
77 | ||
78 | lv = strrchr(pathdup, '/'); | |
79 | if (!lv) | |
80 | exit(EXIT_FAILURE); | |
81 | ||
82 | *lv = '\0'; | |
83 | lv++; | |
84 | ||
85 | vg = strrchr(pathdup, '/'); | |
86 | if (!vg) | |
87 | exit(EXIT_FAILURE); | |
88 | vg++; | |
89 | ||
90 | if (thinpool) { | |
91 | len = strlen(pathdup) + strlen(thinpool) + 2; | |
92 | tp = alloca(len); | |
93 | ||
94 | ret = snprintf(tp, len, "%s/%s", pathdup, thinpool); | |
95 | if (ret < 0 || ret >= len) | |
96 | exit(EXIT_FAILURE); | |
97 | ||
98 | ret = lvm_is_thin_pool(tp); | |
99 | INFO("got %d for thin pool at path: %s", ret, tp); | |
100 | if (ret < 0) | |
101 | exit(EXIT_FAILURE); | |
102 | ||
103 | if (!ret) | |
104 | tp = NULL; | |
105 | } | |
106 | ||
79816ab3 | 107 | (void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1); |
2b9cbd53 CB |
108 | if (!tp) |
109 | execlp("lvcreate", "lvcreate", "-L", sz, vg, "-n", lv, (char *)NULL); | |
110 | else | |
111 | execlp("lvcreate", "lvcreate", "--thinpool", tp, "-V", sz, vg, "-n", lv, (char *)NULL); | |
112 | ||
113 | SYSERROR("execlp"); | |
114 | exit(EXIT_FAILURE); | |
115 | } | |
116 | ||
117 | ||
118 | /* | |
119 | * Look at /sys/dev/block/maj:min/dm/uuid. If it contains the hardcoded LVM | |
120 | * prefix "LVM-", then this is an lvm2 LV | |
121 | */ | |
122 | int lvm_detect(const char *path) | |
123 | { | |
124 | char devp[MAXPATHLEN], buf[4]; | |
125 | FILE *fout; | |
126 | int ret; | |
127 | struct stat statbuf; | |
128 | ||
f7ac4459 CB |
129 | if (!strncmp(path, "lvm:", 4)) |
130 | return 1; | |
2b9cbd53 CB |
131 | |
132 | ret = stat(path, &statbuf); | |
133 | if (ret != 0) | |
134 | return 0; | |
135 | if (!S_ISBLK(statbuf.st_mode)) | |
136 | return 0; | |
137 | ||
138 | ret = snprintf(devp, MAXPATHLEN, "/sys/dev/block/%d:%d/dm/uuid", | |
139 | major(statbuf.st_rdev), minor(statbuf.st_rdev)); | |
140 | if (ret < 0 || ret >= MAXPATHLEN) { | |
141 | ERROR("lvm uuid pathname too long"); | |
142 | return 0; | |
143 | } | |
144 | fout = fopen(devp, "r"); | |
145 | if (!fout) | |
146 | return 0; | |
147 | ret = fread(buf, 1, 4, fout); | |
148 | fclose(fout); | |
149 | if (ret != 4 || strncmp(buf, "LVM-", 4) != 0) | |
150 | return 0; | |
151 | return 1; | |
152 | } | |
153 | ||
154 | int lvm_mount(struct bdev *bdev) | |
155 | { | |
11274f69 CB |
156 | char *src; |
157 | ||
2b9cbd53 CB |
158 | if (strcmp(bdev->type, "lvm")) |
159 | return -22; | |
11274f69 | 160 | |
2b9cbd53 CB |
161 | if (!bdev->src || !bdev->dest) |
162 | return -22; | |
11274f69 CB |
163 | |
164 | src = lxc_storage_get_path(bdev->src, bdev->type); | |
165 | ||
166 | /* If we might pass in data sometime, then we'll have to enrich | |
167 | * mount_unknown_fs(). | |
168 | */ | |
169 | return mount_unknown_fs(src, bdev->dest, bdev->mntopts); | |
2b9cbd53 CB |
170 | } |
171 | ||
172 | int lvm_umount(struct bdev *bdev) | |
173 | { | |
174 | if (strcmp(bdev->type, "lvm")) | |
175 | return -22; | |
11274f69 | 176 | |
2b9cbd53 CB |
177 | if (!bdev->src || !bdev->dest) |
178 | return -22; | |
11274f69 | 179 | |
2b9cbd53 CB |
180 | return umount(bdev->dest); |
181 | } | |
182 | ||
183 | int lvm_compare_lv_attr(const char *path, int pos, const char expected) | |
184 | { | |
185 | struct lxc_popen_FILE *f; | |
186 | int ret, len, status, start=0; | |
187 | char *cmd, output[12]; | |
188 | const char *lvscmd = "lvs --unbuffered --noheadings -o lv_attr %s 2>/dev/null"; | |
189 | ||
190 | len = strlen(lvscmd) + strlen(path) - 1; | |
191 | cmd = alloca(len); | |
192 | ||
193 | ret = snprintf(cmd, len, lvscmd, path); | |
194 | if (ret < 0 || ret >= len) | |
195 | return -1; | |
196 | ||
197 | f = lxc_popen(cmd); | |
198 | ||
199 | if (f == NULL) { | |
200 | SYSERROR("popen failed"); | |
201 | return -1; | |
202 | } | |
203 | ||
204 | ret = fgets(output, 12, f->f) == NULL; | |
205 | ||
206 | status = lxc_pclose(f); | |
207 | ||
208 | if (ret || WEXITSTATUS(status)) | |
209 | // Assume either vg or lvs do not exist, default | |
210 | // comparison to false. | |
211 | return 0; | |
212 | ||
213 | len = strlen(output); | |
214 | while(start < len && output[start] == ' ') start++; | |
215 | ||
216 | if (start + pos < len && output[start + pos] == expected) | |
217 | return 1; | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | int lvm_is_thin_volume(const char *path) | |
223 | { | |
224 | return lvm_compare_lv_attr(path, 6, 't'); | |
225 | } | |
226 | ||
227 | int lvm_is_thin_pool(const char *path) | |
228 | { | |
229 | return lvm_compare_lv_attr(path, 0, 't'); | |
230 | } | |
231 | ||
232 | int lvm_snapshot(const char *orig, const char *path, uint64_t size) | |
233 | { | |
234 | int ret, pid; | |
235 | char sz[24], *pathdup, *lv; | |
236 | ||
237 | if ((pid = fork()) < 0) { | |
238 | SYSERROR("failed fork"); | |
239 | return -1; | |
240 | } | |
241 | if (pid > 0) | |
242 | return wait_for_pid(pid); | |
243 | ||
244 | // specify bytes to lvcreate | |
245 | ret = snprintf(sz, 24, "%"PRIu64"b", size); | |
246 | if (ret < 0 || ret >= 24) | |
247 | exit(EXIT_FAILURE); | |
248 | ||
249 | pathdup = strdup(path); | |
250 | if (!pathdup) | |
251 | exit(EXIT_FAILURE); | |
252 | lv = strrchr(pathdup, '/'); | |
253 | if (!lv) { | |
254 | free(pathdup); | |
255 | exit(EXIT_FAILURE); | |
256 | } | |
257 | *lv = '\0'; | |
258 | lv++; | |
259 | ||
260 | // check if the original lv is backed by a thin pool, in which case we | |
261 | // cannot specify a size that's different from the original size. | |
262 | ret = lvm_is_thin_volume(orig); | |
263 | if (ret == -1) { | |
264 | free(pathdup); | |
265 | return -1; | |
266 | } | |
267 | ||
79816ab3 | 268 | (void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1); |
2b9cbd53 CB |
269 | if (!ret) { |
270 | ret = execlp("lvcreate", "lvcreate", "-s", "-L", sz, "-n", lv, orig, (char *)NULL); | |
271 | } else { | |
272 | ret = execlp("lvcreate", "lvcreate", "-s", "-n", lv, orig, (char *)NULL); | |
273 | } | |
274 | ||
275 | free(pathdup); | |
276 | exit(EXIT_FAILURE); | |
277 | } | |
278 | ||
279 | int lvm_clonepaths(struct bdev *orig, struct bdev *new, const char *oldname, | |
280 | const char *cname, const char *oldpath, const char *lxcpath, int snap, | |
281 | uint64_t newsize, struct lxc_conf *conf) | |
282 | { | |
283 | char fstype[100]; | |
284 | uint64_t size = newsize; | |
285 | int len, ret; | |
a5b18cb1 CB |
286 | const char *cmd_args[2]; |
287 | char cmd_output[MAXPATHLEN]; | |
2b9cbd53 CB |
288 | |
289 | if (!orig->src || !orig->dest) | |
290 | return -1; | |
291 | ||
292 | if (strcmp(orig->type, "lvm")) { | |
293 | const char *vg; | |
294 | ||
295 | if (snap) { | |
296 | ERROR("LVM snapshot from %s backing store is not supported", | |
297 | orig->type); | |
298 | return -1; | |
299 | } | |
300 | vg = lxc_global_config_value("lxc.bdev.lvm.vg"); | |
01e5fa07 CB |
301 | if (!vg) { |
302 | ERROR("The \"lxc.bdev.lvm.vg\" key is not set"); | |
303 | return -1; | |
304 | } | |
305 | ||
11274f69 CB |
306 | len = strlen("/dev/") + strlen(vg) + strlen(cname) + 4 + 2; |
307 | new->src = malloc(len); | |
505dd987 | 308 | if (!new->src) |
2b9cbd53 | 309 | return -1; |
11274f69 CB |
310 | |
311 | ret = snprintf(new->src, len, "lvm:/dev/%s/%s", vg, cname); | |
2b9cbd53 CB |
312 | if (ret < 0 || ret >= len) |
313 | return -1; | |
314 | } else { | |
315 | new->src = dir_new_path(orig->src, oldname, cname, oldpath, lxcpath); | |
316 | if (!new->src) | |
317 | return -1; | |
318 | } | |
319 | ||
320 | if (orig->mntopts) { | |
321 | new->mntopts = strdup(orig->mntopts); | |
322 | if (!new->mntopts) | |
323 | return -1; | |
324 | } | |
325 | ||
326 | len = strlen(lxcpath) + strlen(cname) + strlen("rootfs") + 3; | |
327 | new->dest = malloc(len); | |
328 | if (!new->dest) | |
329 | return -1; | |
330 | ret = snprintf(new->dest, len, "%s/%s/rootfs", lxcpath, cname); | |
331 | if (ret < 0 || ret >= len) | |
332 | return -1; | |
333 | if (mkdir_p(new->dest, 0755) < 0) | |
334 | return -1; | |
335 | ||
336 | if (is_blktype(orig)) { | |
337 | if (!newsize && blk_getsize(orig, &size) < 0) { | |
338 | ERROR("Error getting size of %s", orig->src); | |
339 | return -1; | |
340 | } | |
341 | if (detect_fs(orig, fstype, 100) < 0) { | |
342 | INFO("could not find fstype for %s, using ext3", orig->src); | |
343 | return -1; | |
344 | } | |
345 | } else { | |
346 | sprintf(fstype, "ext3"); | |
347 | if (!newsize) | |
348 | size = DEFAULT_FS_SIZE; | |
349 | } | |
350 | ||
351 | if (snap) { | |
11274f69 CB |
352 | char *newsrc, *origsrc; |
353 | ||
354 | origsrc = lxc_storage_get_path(orig->src, "lvm"); | |
355 | newsrc = lxc_storage_get_path(new->src, "lvm"); | |
356 | ||
357 | if (lvm_snapshot(origsrc, newsrc, size) < 0) { | |
2b9cbd53 CB |
358 | ERROR("could not create %s snapshot of %s", new->src, orig->src); |
359 | return -1; | |
360 | } | |
361 | } else { | |
11274f69 CB |
362 | char *src; |
363 | ||
364 | src = lxc_storage_get_path(new->src, "lvm"); | |
365 | if (do_lvm_create(src, size, lxc_global_config_value("lxc.bdev.lvm.thin_pool")) < 0) { | |
2b9cbd53 CB |
366 | ERROR("Error creating new lvm blockdev"); |
367 | return -1; | |
368 | } | |
a5b18cb1 CB |
369 | |
370 | cmd_args[0] = fstype; | |
11274f69 | 371 | cmd_args[1] = src; |
a5b18cb1 CB |
372 | // create an fs in the loopback file |
373 | ret = run_command(cmd_output, sizeof(cmd_output), | |
374 | do_mkfs_exec_wrapper, (void *)cmd_args); | |
375 | if (ret < 0) | |
2b9cbd53 | 376 | return -1; |
2b9cbd53 CB |
377 | } |
378 | ||
379 | return 0; | |
380 | } | |
381 | ||
382 | int lvm_destroy(struct bdev *orig) | |
383 | { | |
11274f69 CB |
384 | char *src; |
385 | ||
2b9cbd53 CB |
386 | pid_t pid; |
387 | ||
388 | if ((pid = fork()) < 0) | |
389 | return -1; | |
11274f69 | 390 | |
2b9cbd53 | 391 | if (!pid) { |
79816ab3 | 392 | (void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1); |
11274f69 CB |
393 | src = lxc_storage_get_path(orig->src, "lvm"); |
394 | execlp("lvremove", "lvremove", "-f", src, (char *)NULL); | |
2b9cbd53 CB |
395 | exit(EXIT_FAILURE); |
396 | } | |
11274f69 | 397 | |
2b9cbd53 CB |
398 | return wait_for_pid(pid); |
399 | } | |
400 | ||
401 | int lvm_create(struct bdev *bdev, const char *dest, const char *n, | |
402 | struct bdev_specs *specs) | |
403 | { | |
404 | const char *vg, *thinpool, *fstype, *lv = n; | |
405 | uint64_t sz; | |
406 | int ret, len; | |
a5b18cb1 CB |
407 | const char *cmd_args[2]; |
408 | char cmd_output[MAXPATHLEN]; | |
2b9cbd53 CB |
409 | |
410 | if (!specs) | |
411 | return -1; | |
412 | ||
413 | vg = specs->lvm.vg; | |
414 | if (!vg) | |
415 | vg = lxc_global_config_value("lxc.bdev.lvm.vg"); | |
416 | ||
417 | thinpool = specs->lvm.thinpool; | |
418 | if (!thinpool) | |
419 | thinpool = lxc_global_config_value("lxc.bdev.lvm.thin_pool"); | |
420 | ||
421 | /* /dev/$vg/$lv */ | |
422 | if (specs->lvm.lv) | |
423 | lv = specs->lvm.lv; | |
424 | ||
11274f69 | 425 | len = strlen(vg) + strlen(lv) + 4 + 7; |
2b9cbd53 CB |
426 | bdev->src = malloc(len); |
427 | if (!bdev->src) | |
428 | return -1; | |
429 | ||
11274f69 | 430 | ret = snprintf(bdev->src, len, "lvm:/dev/%s/%s", vg, lv); |
2b9cbd53 CB |
431 | if (ret < 0 || ret >= len) |
432 | return -1; | |
433 | ||
434 | // fssize is in bytes. | |
435 | sz = specs->fssize; | |
436 | if (!sz) | |
437 | sz = DEFAULT_FS_SIZE; | |
438 | ||
11274f69 | 439 | if (do_lvm_create(bdev->src + 4, sz, thinpool) < 0) { |
2b9cbd53 CB |
440 | ERROR("Error creating new lvm blockdev %s size %"PRIu64" bytes", bdev->src, sz); |
441 | return -1; | |
442 | } | |
443 | ||
444 | fstype = specs->fstype; | |
445 | if (!fstype) | |
446 | fstype = DEFAULT_FSTYPE; | |
a5b18cb1 CB |
447 | |
448 | cmd_args[0] = fstype; | |
11274f69 | 449 | cmd_args[1] = bdev->src + 4; |
a5b18cb1 CB |
450 | ret = run_command(cmd_output, sizeof(cmd_output), do_mkfs_exec_wrapper, |
451 | (void *)cmd_args); | |
452 | if (ret < 0) | |
2b9cbd53 | 453 | return -1; |
a5b18cb1 | 454 | |
2b9cbd53 CB |
455 | if (!(bdev->dest = strdup(dest))) |
456 | return -1; | |
457 | ||
458 | if (mkdir_p(bdev->dest, 0755) < 0) { | |
459 | ERROR("Error creating %s", bdev->dest); | |
460 | return -1; | |
461 | } | |
462 | ||
463 | return 0; | |
464 | } |