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btrfs-progs: format FREE_SPACE_TREE{,_VALID} nicely in dump-super
[btrfs-progs-unstable/devel.git] / cmds-filesystem.c
blob41623f3183a896c95366d824bcea87ed00d5356e
1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public
4 * License v2 as published by the Free Software Foundation.
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9 * General Public License for more details.
10 *
11 * You should have received a copy of the GNU General Public
12 * License along with this program; if not, write to the
13 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
14 * Boston, MA 021110-1307, USA.
15 */
16
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <string.h>
20 #include <unistd.h>
21 #include <sys/ioctl.h>
22 #include <errno.h>
23 #include <uuid/uuid.h>
24 #include <ctype.h>
25 #include <fcntl.h>
26 #include <ftw.h>
27 #include <mntent.h>
28 #include <linux/limits.h>
29 #include <getopt.h>
30
31 #include "kerncompat.h"
32 #include "ctree.h"
33 #include "ioctl.h"
34 #include "utils.h"
35 #include "volumes.h"
36 #include "commands.h"
37 #include "cmds-fi-usage.h"
38 #include "list_sort.h"
39 #include "disk-io.h"
40 #include "cmds-fi-du.h"
41
42 /*
43 * for btrfs fi show, we maintain a hash of fsids we've already printed.
44 * This way we don't print dups if a given FS is mounted more than once.
45 */
46 #define SEEN_FSID_HASH_SIZE 256
47
48 struct seen_fsid {
49 u8 fsid[BTRFS_FSID_SIZE];
50 struct seen_fsid *next;
51 };
52
53 static struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = {NULL,};
54
55 static int is_seen_fsid(u8 *fsid)
56 {
57 u8 hash = fsid[0];
58 int slot = hash % SEEN_FSID_HASH_SIZE;
59 struct seen_fsid *seen = seen_fsid_hash[slot];
60
61 while (seen) {
62 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
63 return 1;
64
65 seen = seen->next;
66 }
67
68 return 0;
69 }
70
71 static int add_seen_fsid(u8 *fsid)
72 {
73 u8 hash = fsid[0];
74 int slot = hash % SEEN_FSID_HASH_SIZE;
75 struct seen_fsid *seen = seen_fsid_hash[slot];
76 struct seen_fsid *alloc;
77
78 if (!seen)
79 goto insert;
80
81 while (1) {
82 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
83 return -EEXIST;
84
85 if (!seen->next)
86 break;
87
88 seen = seen->next;
89 }
90
91 insert:
92
93 alloc = malloc(sizeof(*alloc));
94 if (!alloc)
95 return -ENOMEM;
96
97 alloc->next = NULL;
98 memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
99
100 if (seen)
101 seen->next = alloc;
102 else
103 seen_fsid_hash[slot] = alloc;
104
105 return 0;
106 }
107
108 static void free_seen_fsid(void)
109 {
110 int slot;
111 struct seen_fsid *seen;
112 struct seen_fsid *next;
113
114 for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
115 seen = seen_fsid_hash[slot];
116 while (seen) {
117 next = seen->next;
118 free(seen);
119 seen = next;
120 }
121 seen_fsid_hash[slot] = NULL;
122 }
123 }
124
125 static const char * const filesystem_cmd_group_usage[] = {
126 "btrfs filesystem [<group>] <command> [<args>]",
127 NULL
128 };
129
130 static const char * const cmd_filesystem_df_usage[] = {
131 "btrfs filesystem df [options] <path>",
132 "Show space usage information for a mount point",
133 HELPINFO_UNITS_SHORT_LONG,
134 NULL
135 };
136
137 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
138 {
139 u64 count = 0;
140 int ret;
141 struct btrfs_ioctl_space_args *sargs;
142
143 sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
144 if (!sargs)
145 return -ENOMEM;
146
147 sargs->space_slots = 0;
148 sargs->total_spaces = 0;
149
150 ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
151 if (ret < 0) {
152 error("cannot get space info: %s\n", strerror(errno));
153 free(sargs);
154 return -errno;
155 }
156 /* This really should never happen */
157 if (!sargs->total_spaces) {
158 free(sargs);
159 return -ENOENT;
160 }
161 count = sargs->total_spaces;
162 free(sargs);
163
164 sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
165 (count * sizeof(struct btrfs_ioctl_space_info)));
166 if (!sargs)
167 return -ENOMEM;
168
169 sargs->space_slots = count;
170 sargs->total_spaces = 0;
171 ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
172 if (ret < 0) {
173 error("cannot get space info with %llu slots: %s",
174 count, strerror(errno));
175 free(sargs);
176 return -errno;
177 }
178 *sargs_ret = sargs;
179 return 0;
180 }
181
182 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
183 {
184 u64 i;
185 struct btrfs_ioctl_space_info *sp = sargs->spaces;
186
187 for (i = 0; i < sargs->total_spaces; i++, sp++) {
188 printf("%s, %s: total=%s, used=%s\n",
189 btrfs_group_type_str(sp->flags),
190 btrfs_group_profile_str(sp->flags),
191 pretty_size_mode(sp->total_bytes, unit_mode),
192 pretty_size_mode(sp->used_bytes, unit_mode));
193 }
194 }
195
196 static int cmd_filesystem_df(int argc, char **argv)
197 {
198 struct btrfs_ioctl_space_args *sargs = NULL;
199 int ret;
200 int fd;
201 char *path;
202 DIR *dirstream = NULL;
203 unsigned unit_mode;
204
205 unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
206
207 clean_args_no_options(argc, argv, cmd_filesystem_df_usage);
208
209 if (check_argc_exact(argc - optind, 1))
210 usage(cmd_filesystem_df_usage);
211
212 path = argv[optind];
213
214 fd = btrfs_open_dir(path, &dirstream, 1);
215 if (fd < 0)
216 return 1;
217
218 ret = get_df(fd, &sargs);
219
220 if (ret == 0) {
221 print_df(sargs, unit_mode);
222 free(sargs);
223 } else {
224 error("get_df failed %s", strerror(-ret));
225 }
226
227 close_file_or_dir(fd, dirstream);
228 return !!ret;
229 }
230
231 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
232 char *search)
233 {
234 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
235 int search_len = strlen(search);
236
237 search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
238 uuid_unparse(fsid, uuidbuf);
239 if (!strncmp(uuidbuf, search, search_len))
240 return 1;
241
242 if (*label && strcmp(label, search) == 0)
243 return 1;
244
245 if (strcmp(mnt, search) == 0)
246 return 1;
247
248 return 0;
249 }
250
251 static int uuid_search(struct btrfs_fs_devices *fs_devices, const char *search)
252 {
253 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
254 struct list_head *cur;
255 struct btrfs_device *device;
256 int search_len = strlen(search);
257
258 search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
259 uuid_unparse(fs_devices->fsid, uuidbuf);
260 if (!strncmp(uuidbuf, search, search_len))
261 return 1;
262
263 list_for_each(cur, &fs_devices->devices) {
264 device = list_entry(cur, struct btrfs_device, dev_list);
265 if ((device->label && strcmp(device->label, search) == 0) ||
266 strcmp(device->name, search) == 0)
267 return 1;
268 }
269 return 0;
270 }
271
272 /*
273 * Sort devices by devid, ascending
274 */
275 static int cmp_device_id(void *priv, struct list_head *a,
276 struct list_head *b)
277 {
278 const struct btrfs_device *da = list_entry(a, struct btrfs_device,
279 dev_list);
280 const struct btrfs_device *db = list_entry(b, struct btrfs_device,
281 dev_list);
282
283 return da->devid < db->devid ? -1 :
284 da->devid > db->devid ? 1 : 0;
285 }
286
287 static void splice_device_list(struct list_head *seed_devices,
288 struct list_head *all_devices)
289 {
290 struct btrfs_device *in_all, *next_all;
291 struct btrfs_device *in_seed, *next_seed;
292
293 list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
294 list_for_each_entry_safe(in_seed, next_seed, seed_devices,
295 dev_list) {
296 if (in_all->devid == in_seed->devid) {
297 /*
298 * When do dev replace in a sprout fs
299 * to a dev in its seed fs, the replacing
300 * dev will reside in the sprout fs and
301 * the replaced dev will still exist
302 * in the seed fs.
303 * So pick the latest one when showing
304 * the sprout fs.
305 */
306 if (in_all->generation
307 < in_seed->generation) {
308 list_del(&in_all->dev_list);
309 free(in_all);
310 } else if (in_all->generation
311 > in_seed->generation) {
312 list_del(&in_seed->dev_list);
313 free(in_seed);
314 }
315 break;
316 }
317 }
318 }
319
320 list_splice(seed_devices, all_devices);
321 }
322
323 static void print_devices(struct btrfs_fs_devices *fs_devices,
324 u64 *devs_found, unsigned unit_mode)
325 {
326 struct btrfs_device *device;
327 struct btrfs_fs_devices *cur_fs;
328 struct list_head *all_devices;
329
330 all_devices = &fs_devices->devices;
331 cur_fs = fs_devices->seed;
332 /* add all devices of seed fs to the fs to be printed */
333 while (cur_fs) {
334 splice_device_list(&cur_fs->devices, all_devices);
335 cur_fs = cur_fs->seed;
336 }
337
338 list_sort(NULL, all_devices, cmp_device_id);
339 list_for_each_entry(device, all_devices, dev_list) {
340 printf("\tdevid %4llu size %s used %s path %s\n",
341 (unsigned long long)device->devid,
342 pretty_size_mode(device->total_bytes, unit_mode),
343 pretty_size_mode(device->bytes_used, unit_mode),
344 device->name);
345
346 (*devs_found)++;
347 }
348 }
349
350 static void print_one_uuid(struct btrfs_fs_devices *fs_devices,
351 unsigned unit_mode)
352 {
353 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
354 struct btrfs_device *device;
355 u64 devs_found = 0;
356 u64 total;
357
358 if (add_seen_fsid(fs_devices->fsid))
359 return;
360
361 uuid_unparse(fs_devices->fsid, uuidbuf);
362 device = list_entry(fs_devices->devices.next, struct btrfs_device,
363 dev_list);
364 if (device->label && device->label[0])
365 printf("Label: '%s' ", device->label);
366 else
367 printf("Label: none ");
368
369 total = device->total_devs;
370 printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
371 (unsigned long long)total,
372 pretty_size_mode(device->super_bytes_used, unit_mode));
373
374 print_devices(fs_devices, &devs_found, unit_mode);
375
376 if (devs_found < total) {
377 printf("\t*** Some devices missing\n");
378 }
379 printf("\n");
380 }
381
382 /* adds up all the used spaces as reported by the space info ioctl
383 */
384 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
385 {
386 u64 ret = 0;
387 int i;
388 for (i = 0; i < si->total_spaces; i++)
389 ret += si->spaces[i].used_bytes;
390 return ret;
391 }
392
393 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
394 struct btrfs_ioctl_dev_info_args *dev_info,
395 struct btrfs_ioctl_space_args *space_info,
396 char *label, unsigned unit_mode)
397 {
398 int i;
399 int fd;
400 int missing = 0;
401 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
402 struct btrfs_ioctl_dev_info_args *tmp_dev_info;
403 int ret;
404
405 ret = add_seen_fsid(fs_info->fsid);
406 if (ret == -EEXIST)
407 return 0;
408 else if (ret)
409 return ret;
410
411 uuid_unparse(fs_info->fsid, uuidbuf);
412 if (label && *label)
413 printf("Label: '%s' ", label);
414 else
415 printf("Label: none ");
416
417 printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
418 fs_info->num_devices,
419 pretty_size_mode(calc_used_bytes(space_info),
420 unit_mode));
421
422 for (i = 0; i < fs_info->num_devices; i++) {
423 char *canonical_path;
424
425 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
426
427 /* Add check for missing devices even mounted */
428 fd = open((char *)tmp_dev_info->path, O_RDONLY);
429 if (fd < 0) {
430 missing = 1;
431 continue;
432 }
433 close(fd);
434 canonical_path = canonicalize_path((char *)tmp_dev_info->path);
435 printf("\tdevid %4llu size %s used %s path %s\n",
436 tmp_dev_info->devid,
437 pretty_size_mode(tmp_dev_info->total_bytes, unit_mode),
438 pretty_size_mode(tmp_dev_info->bytes_used, unit_mode),
439 canonical_path);
440
441 free(canonical_path);
442 }
443
444 if (missing)
445 printf("\t*** Some devices missing\n");
446 printf("\n");
447 return 0;
448 }
449
450 static int btrfs_scan_kernel(void *search, unsigned unit_mode)
451 {
452 int ret = 0, fd;
453 int found = 0;
454 FILE *f;
455 struct mntent *mnt;
456 struct btrfs_ioctl_fs_info_args fs_info_arg;
457 struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
458 struct btrfs_ioctl_space_args *space_info_arg = NULL;
459 char label[BTRFS_LABEL_SIZE];
460
461 f = setmntent("/proc/self/mounts", "r");
462 if (f == NULL)
463 return 1;
464
465 memset(label, 0, sizeof(label));
466 while ((mnt = getmntent(f)) != NULL) {
467 free(dev_info_arg);
468 dev_info_arg = NULL;
469 if (strcmp(mnt->mnt_type, "btrfs"))
470 continue;
471 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
472 &dev_info_arg);
473 if (ret)
474 goto out;
475
476 /* skip all fs already shown as mounted fs */
477 if (is_seen_fsid(fs_info_arg.fsid))
478 continue;
479
480 ret = get_label_mounted(mnt->mnt_dir, label);
481 /* provide backward kernel compatibility */
482 if (ret == -ENOTTY)
483 ret = get_label_unmounted(
484 (const char *)dev_info_arg->path, label);
485
486 if (ret)
487 goto out;
488
489 if (search && !match_search_item_kernel(fs_info_arg.fsid,
490 mnt->mnt_dir, label, search)) {
491 continue;
492 }
493
494 fd = open(mnt->mnt_dir, O_RDONLY);
495 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
496 print_one_fs(&fs_info_arg, dev_info_arg,
497 space_info_arg, label, unit_mode);
498 free(space_info_arg);
499 memset(label, 0, sizeof(label));
500 found = 1;
501 }
502 if (fd != -1)
503 close(fd);
504 }
505
506 out:
507 free(dev_info_arg);
508 endmntent(f);
509 return !found;
510 }
511
512 static int dev_to_fsid(const char *dev, __u8 *fsid)
513 {
514 struct btrfs_super_block *disk_super;
515 char buf[BTRFS_SUPER_INFO_SIZE];
516 int ret;
517 int fd;
518
519 fd = open(dev, O_RDONLY);
520 if (fd < 0) {
521 ret = -errno;
522 return ret;
523 }
524
525 disk_super = (struct btrfs_super_block *)buf;
526 ret = btrfs_read_dev_super(fd, disk_super,
527 BTRFS_SUPER_INFO_OFFSET, SBREAD_DEFAULT);
528 if (ret)
529 goto out;
530
531 memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
532 ret = 0;
533
534 out:
535 close(fd);
536 return ret;
537 }
538
539 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
540 {
541 struct btrfs_fs_devices *cur_seed, *next_seed;
542 struct btrfs_device *device;
543
544 while (!list_empty(&fs_devices->devices)) {
545 device = list_entry(fs_devices->devices.next,
546 struct btrfs_device, dev_list);
547 list_del(&device->dev_list);
548
549 free(device->name);
550 free(device->label);
551 free(device);
552 }
553
554 /* free seed fs chain */
555 cur_seed = fs_devices->seed;
556 fs_devices->seed = NULL;
557 while (cur_seed) {
558 next_seed = cur_seed->seed;
559 free(cur_seed);
560
561 cur_seed = next_seed;
562 }
563
564 list_del(&fs_devices->list);
565 free(fs_devices);
566 }
567
568 static int copy_device(struct btrfs_device *dst,
569 struct btrfs_device *src)
570 {
571 dst->devid = src->devid;
572 memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
573 if (src->name == NULL)
574 dst->name = NULL;
575 else {
576 dst->name = strdup(src->name);
577 if (!dst->name)
578 return -ENOMEM;
579 }
580 if (src->label == NULL)
581 dst->label = NULL;
582 else {
583 dst->label = strdup(src->label);
584 if (!dst->label) {
585 free(dst->name);
586 return -ENOMEM;
587 }
588 }
589 dst->total_devs = src->total_devs;
590 dst->super_bytes_used = src->super_bytes_used;
591 dst->total_bytes = src->total_bytes;
592 dst->bytes_used = src->bytes_used;
593 dst->generation = src->generation;
594
595 return 0;
596 }
597
598 static int copy_fs_devices(struct btrfs_fs_devices *dst,
599 struct btrfs_fs_devices *src)
600 {
601 struct btrfs_device *cur_dev, *dev_copy;
602 int ret = 0;
603
604 memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
605 INIT_LIST_HEAD(&dst->devices);
606 dst->seed = NULL;
607
608 list_for_each_entry(cur_dev, &src->devices, dev_list) {
609 dev_copy = malloc(sizeof(*dev_copy));
610 if (!dev_copy) {
611 ret = -ENOMEM;
612 break;
613 }
614
615 ret = copy_device(dev_copy, cur_dev);
616 if (ret) {
617 free(dev_copy);
618 break;
619 }
620
621 list_add(&dev_copy->dev_list, &dst->devices);
622 dev_copy->fs_devices = dst;
623 }
624
625 return ret;
626 }
627
628 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
629 struct btrfs_fs_devices *copy,
630 struct list_head *fs_uuids) {
631 struct btrfs_fs_devices *cur_fs;
632
633 list_for_each_entry(cur_fs, fs_uuids, list)
634 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
635 return copy_fs_devices(copy, cur_fs);
636
637 return 1;
638 }
639
640 static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
641 {
642 struct btrfs_device *device;
643 int dev_cnt_total, dev_cnt = 0;
644
645 device = list_first_entry(&fs_devices->devices, struct btrfs_device,
646 dev_list);
647
648 dev_cnt_total = device->total_devs;
649
650 list_for_each_entry(device, &fs_devices->devices, dev_list)
651 dev_cnt++;
652
653 return dev_cnt_total != dev_cnt;
654 }
655
656 static int search_umounted_fs_uuids(struct list_head *all_uuids,
657 char *search, int *found)
658 {
659 struct btrfs_fs_devices *cur_fs, *fs_copy;
660 struct list_head *fs_uuids;
661 int ret = 0;
662
663 fs_uuids = btrfs_scanned_uuids();
664
665 /*
666 * The fs_uuids list is global, and open_ctree_* will
667 * modify it, make a private copy here
668 */
669 list_for_each_entry(cur_fs, fs_uuids, list) {
670 /* don't bother handle all fs, if search target specified */
671 if (search) {
672 if (uuid_search(cur_fs, search) == 0)
673 continue;
674 if (found)
675 *found = 1;
676 }
677
678 /* skip all fs already shown as mounted fs */
679 if (is_seen_fsid(cur_fs->fsid))
680 continue;
681
682 fs_copy = calloc(1, sizeof(*fs_copy));
683 if (!fs_copy) {
684 ret = -ENOMEM;
685 goto out;
686 }
687
688 ret = copy_fs_devices(fs_copy, cur_fs);
689 if (ret) {
690 free(fs_copy);
691 goto out;
692 }
693
694 list_add(&fs_copy->list, all_uuids);
695 }
696
697 out:
698 return ret;
699 }
700
701 static int map_seed_devices(struct list_head *all_uuids)
702 {
703 struct btrfs_fs_devices *cur_fs, *cur_seed;
704 struct btrfs_fs_devices *seed_copy;
705 struct btrfs_fs_devices *opened_fs;
706 struct btrfs_device *device;
707 struct btrfs_fs_info *fs_info;
708 struct list_head *fs_uuids;
709 int ret = 0;
710
711 fs_uuids = btrfs_scanned_uuids();
712
713 list_for_each_entry(cur_fs, all_uuids, list) {
714 device = list_first_entry(&cur_fs->devices,
715 struct btrfs_device, dev_list);
716 if (!device)
717 continue;
718
719 /* skip fs without seeds */
720 if (!has_seed_devices(cur_fs))
721 continue;
722
723 /*
724 * open_ctree_* detects seed/sprout mapping
725 */
726 fs_info = open_ctree_fs_info(device->name, 0, 0, 0,
727 OPEN_CTREE_PARTIAL);
728 if (!fs_info)
729 continue;
730
731 /*
732 * copy the seed chain under the opened fs
733 */
734 opened_fs = fs_info->fs_devices;
735 cur_seed = cur_fs;
736 while (opened_fs->seed) {
737 seed_copy = malloc(sizeof(*seed_copy));
738 if (!seed_copy) {
739 ret = -ENOMEM;
740 goto fail_out;
741 }
742 ret = find_and_copy_seed(opened_fs->seed, seed_copy,
743 fs_uuids);
744 if (ret) {
745 free(seed_copy);
746 goto fail_out;
747 }
748
749 cur_seed->seed = seed_copy;
750
751 opened_fs = opened_fs->seed;
752 cur_seed = cur_seed->seed;
753 }
754
755 close_ctree(fs_info->chunk_root);
756 }
757
758 out:
759 return ret;
760 fail_out:
761 close_ctree(fs_info->chunk_root);
762 goto out;
763 }
764
765 static const char * const cmd_filesystem_show_usage[] = {
766 "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
767 "Show the structure of a filesystem",
768 "-d|--all-devices show only disks under /dev containing btrfs filesystem",
769 "-m|--mounted show only mounted btrfs",
770 HELPINFO_UNITS_LONG,
771 "If no argument is given, structure of all present filesystems is shown.",
772 NULL
773 };
774
775 static int cmd_filesystem_show(int argc, char **argv)
776 {
777 LIST_HEAD(all_uuids);
778 struct btrfs_fs_devices *fs_devices;
779 char *search = NULL;
780 int ret;
781 /* default, search both kernel and udev */
782 int where = -1;
783 int type = 0;
784 char mp[PATH_MAX];
785 char path[PATH_MAX];
786 __u8 fsid[BTRFS_FSID_SIZE];
787 char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
788 unsigned unit_mode;
789 int found = 0;
790
791 unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
792
793 while (1) {
794 int c;
795 static const struct option long_options[] = {
796 { "all-devices", no_argument, NULL, 'd'},
797 { "mounted", no_argument, NULL, 'm'},
798 { NULL, 0, NULL, 0 }
799 };
800
801 c = getopt_long(argc, argv, "dm", long_options, NULL);
802 if (c < 0)
803 break;
804 switch (c) {
805 case 'd':
806 where = BTRFS_SCAN_LBLKID;
807 break;
808 case 'm':
809 where = BTRFS_SCAN_MOUNTED;
810 break;
811 default:
812 usage(cmd_filesystem_show_usage);
813 }
814 }
815
816 if (check_argc_max(argc, optind + 1))
817 usage(cmd_filesystem_show_usage);
818
819 if (argc > optind) {
820 search = argv[optind];
821 if (*search == 0)
822 usage(cmd_filesystem_show_usage);
823 type = check_arg_type(search);
824
825 /*
826 * For search is a device:
827 * realpath do /dev/mapper/XX => /dev/dm-X
828 * which is required by BTRFS_SCAN_DEV
829 * For search is a mountpoint:
830 * realpath do /mnt/btrfs/ => /mnt/btrfs
831 * which shall be recognized by btrfs_scan_kernel()
832 */
833 if (realpath(search, path))
834 search = path;
835
836 /*
837 * Needs special handling if input arg is block dev And if
838 * input arg is mount-point just print it right away
839 */
840 if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
841 ret = get_btrfs_mount(search, mp, sizeof(mp));
842 if (!ret) {
843 /* given block dev is mounted */
844 search = mp;
845 type = BTRFS_ARG_MNTPOINT;
846 } else {
847 ret = dev_to_fsid(search, fsid);
848 if (ret) {
849 error("no btrfs on %s", search);
850 return 1;
851 }
852 uuid_unparse(fsid, uuid_buf);
853 search = uuid_buf;
854 type = BTRFS_ARG_UUID;
855 goto devs_only;
856 }
857 }
858 }
859
860 if (where == BTRFS_SCAN_LBLKID)
861 goto devs_only;
862
863 /* show mounted btrfs */
864 ret = btrfs_scan_kernel(search, unit_mode);
865 if (search && !ret) {
866 /* since search is found we are done */
867 goto out;
868 }
869
870 /* shows mounted only */
871 if (where == BTRFS_SCAN_MOUNTED)
872 goto out;
873
874 devs_only:
875 ret = btrfs_scan_devices();
876
877 if (ret) {
878 error("blkid device scan returned %d\n", ret);
879 return 1;
880 }
881
882 ret = search_umounted_fs_uuids(&all_uuids, search, &found);
883 if (ret < 0) {
884 error("searching target device returned error %d", ret);
885 return 1;
886 }
887
888 /*
889 * The seed/sprout mapping are not detected yet,
890 * do mapping build for all umounted fs
891 */
892 ret = map_seed_devices(&all_uuids);
893 if (ret) {
894 error("mapping seed devices returned error %d", ret);
895 return 1;
896 }
897
898 list_for_each_entry(fs_devices, &all_uuids, list)
899 print_one_uuid(fs_devices, unit_mode);
900
901 if (search && !found) {
902 error("not a valid btrfs filesystem: %s", search);
903 ret = 1;
904 }
905 while (!list_empty(&all_uuids)) {
906 fs_devices = list_entry(all_uuids.next,
907 struct btrfs_fs_devices, list);
908 free_fs_devices(fs_devices);
909 }
910 out:
911 free_seen_fsid();
912 return ret;
913 }
914
915 static const char * const cmd_filesystem_sync_usage[] = {
916 "btrfs filesystem sync <path>",
917 "Force a sync on a filesystem",
918 NULL
919 };
920
921 static int cmd_filesystem_sync(int argc, char **argv)
922 {
923 int fd, res, e;
924 char *path;
925 DIR *dirstream = NULL;
926
927 clean_args_no_options(argc, argv, cmd_filesystem_sync_usage);
928
929 if (check_argc_exact(argc - optind, 1))
930 usage(cmd_filesystem_sync_usage);
931
932 path = argv[optind];
933
934 fd = btrfs_open_dir(path, &dirstream, 1);
935 if (fd < 0)
936 return 1;
937
938 res = ioctl(fd, BTRFS_IOC_SYNC);
939 e = errno;
940 close_file_or_dir(fd, dirstream);
941 if( res < 0 ){
942 error("sync ioctl failed on '%s': %s", path, strerror(e));
943 return 1;
944 }
945
946 return 0;
947 }
948
949 static int parse_compress_type(char *s)
950 {
951 if (strcmp(optarg, "zlib") == 0)
952 return BTRFS_COMPRESS_ZLIB;
953 else if (strcmp(optarg, "lzo") == 0)
954 return BTRFS_COMPRESS_LZO;
955 else {
956 error("unknown compression type %s", s);
957 exit(1);
958 };
959 }
960
961 static const char * const cmd_filesystem_defrag_usage[] = {
962 "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
963 "Defragment a file or a directory",
964 "",
965 "-v be verbose",
966 "-r defragment files recursively",
967 "-c[zlib,lzo] compress the file while defragmenting",
968 "-f flush data to disk immediately after defragmenting",
969 "-s start defragment only from byte onward",
970 "-l len defragment only up to len bytes",
971 "-t size target extent size hint (default: 32M)",
972 NULL
973 };
974
975 static int do_defrag(int fd, int fancy_ioctl,
976 struct btrfs_ioctl_defrag_range_args *range)
977 {
978 int ret;
979
980 if (!fancy_ioctl)
981 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
982 else
983 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
984
985 return ret;
986 }
987
988 static int defrag_global_fancy_ioctl;
989 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
990 static int defrag_global_verbose;
991 static int defrag_global_errors;
992 static int defrag_callback(const char *fpath, const struct stat *sb,
993 int typeflag, struct FTW *ftwbuf)
994 {
995 int ret = 0;
996 int err = 0;
997 int fd = 0;
998
999 if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
1000 if (defrag_global_verbose)
1001 printf("%s\n", fpath);
1002 fd = open(fpath, O_RDWR);
1003 if (fd < 0) {
1004 err = errno;
1005 goto error;
1006 }
1007 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
1008 close(fd);
1009 if (ret && errno == ENOTTY && defrag_global_fancy_ioctl) {
1010 error("defrag range ioctl not "
1011 "supported in this kernel, please try "
1012 "without any options.");
1013 defrag_global_errors++;
1014 return ENOTTY;
1015 }
1016 if (ret) {
1017 err = errno;
1018 goto error;
1019 }
1020 }
1021 return 0;
1022
1023 error:
1024 error("defrag failed on %s: %s", fpath, strerror(err));
1025 defrag_global_errors++;
1026 return 0;
1027 }
1028
1029 static int cmd_filesystem_defrag(int argc, char **argv)
1030 {
1031 int fd;
1032 int flush = 0;
1033 u64 start = 0;
1034 u64 len = (u64)-1;
1035 u64 thresh;
1036 int i;
1037 int recursive = 0;
1038 int ret = 0;
1039 int e = 0;
1040 int compress_type = BTRFS_COMPRESS_NONE;
1041 DIR *dirstream;
1042
1043 /*
1044 * Kernel has a different default (256K) that is supposed to be safe,
1045 * but it does not defragment very well. The 32M will likely lead to
1046 * better results and is independent of the kernel default.
1047 */
1048 thresh = 32 * 1024 * 1024;
1049
1050 defrag_global_errors = 0;
1051 defrag_global_verbose = 0;
1052 defrag_global_errors = 0;
1053 defrag_global_fancy_ioctl = 0;
1054 while(1) {
1055 int c = getopt(argc, argv, "vrc::fs:l:t:");
1056 if (c < 0)
1057 break;
1058
1059 switch(c) {
1060 case 'c':
1061 compress_type = BTRFS_COMPRESS_ZLIB;
1062 if (optarg)
1063 compress_type = parse_compress_type(optarg);
1064 defrag_global_fancy_ioctl = 1;
1065 break;
1066 case 'f':
1067 flush = 1;
1068 defrag_global_fancy_ioctl = 1;
1069 break;
1070 case 'v':
1071 defrag_global_verbose = 1;
1072 break;
1073 case 's':
1074 start = parse_size(optarg);
1075 defrag_global_fancy_ioctl = 1;
1076 break;
1077 case 'l':
1078 len = parse_size(optarg);
1079 defrag_global_fancy_ioctl = 1;
1080 break;
1081 case 't':
1082 thresh = parse_size(optarg);
1083 if (thresh > (u32)-1) {
1084 warning(
1085 "target extent size %llu too big, trimmed to %u",
1086 thresh, (u32)-1);
1087 thresh = (u32)-1;
1088 }
1089 defrag_global_fancy_ioctl = 1;
1090 break;
1091 case 'r':
1092 recursive = 1;
1093 break;
1094 default:
1095 usage(cmd_filesystem_defrag_usage);
1096 }
1097 }
1098
1099 if (check_argc_min(argc - optind, 1))
1100 usage(cmd_filesystem_defrag_usage);
1101
1102 memset(&defrag_global_range, 0, sizeof(defrag_global_range));
1103 defrag_global_range.start = start;
1104 defrag_global_range.len = len;
1105 defrag_global_range.extent_thresh = (u32)thresh;
1106 if (compress_type) {
1107 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1108 defrag_global_range.compress_type = compress_type;
1109 }
1110 if (flush)
1111 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1112
1113 for (i = optind; i < argc; i++) {
1114 struct stat st;
1115
1116 dirstream = NULL;
1117 fd = open_file_or_dir(argv[i], &dirstream);
1118 if (fd < 0) {
1119 error("cannot open %s: %s\n", argv[i],
1120 strerror(errno));
1121 defrag_global_errors++;
1122 close_file_or_dir(fd, dirstream);
1123 continue;
1124 }
1125 if (fstat(fd, &st)) {
1126 error("failed to stat %s: %s",
1127 argv[i], strerror(errno));
1128 defrag_global_errors++;
1129 close_file_or_dir(fd, dirstream);
1130 continue;
1131 }
1132 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1133 error("%s is not a directory or a regular file\n",
1134 argv[i]);
1135 defrag_global_errors++;
1136 close_file_or_dir(fd, dirstream);
1137 continue;
1138 }
1139 if (recursive) {
1140 if (S_ISDIR(st.st_mode)) {
1141 ret = nftw(argv[i], defrag_callback, 10,
1142 FTW_MOUNT | FTW_PHYS);
1143 if (ret == ENOTTY)
1144 exit(1);
1145 /* errors are handled in the callback */
1146 ret = 0;
1147 } else {
1148 if (defrag_global_verbose)
1149 printf("%s\n", argv[i]);
1150 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1151 &defrag_global_range);
1152 e = errno;
1153 }
1154 } else {
1155 if (defrag_global_verbose)
1156 printf("%s\n", argv[i]);
1157 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1158 &defrag_global_range);
1159 e = errno;
1160 }
1161 close_file_or_dir(fd, dirstream);
1162 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1163 error("defrag range ioctl not "
1164 "supported in this kernel, please try "
1165 "without any options.");
1166 defrag_global_errors++;
1167 break;
1168 }
1169 if (ret) {
1170 error("defrag failed on %s: %s", argv[i], strerror(e));
1171 defrag_global_errors++;
1172 }
1173 }
1174 if (defrag_global_errors)
1175 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1176
1177 return !!defrag_global_errors;
1178 }
1179
1180 static const char * const cmd_filesystem_resize_usage[] = {
1181 "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1182 "Resize a filesystem",
1183 "If 'max' is passed, the filesystem will occupy all available space",
1184 "on the device 'devid'.",
1185 "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1186 NULL
1187 };
1188
1189 static int cmd_filesystem_resize(int argc, char **argv)
1190 {
1191 struct btrfs_ioctl_vol_args args;
1192 int fd, res, len, e;
1193 char *amount, *path;
1194 DIR *dirstream = NULL;
1195 struct stat st;
1196
1197 clean_args_no_options_relaxed(argc, argv, cmd_filesystem_resize_usage);
1198
1199 if (check_argc_exact(argc - optind, 2))
1200 usage(cmd_filesystem_resize_usage);
1201
1202 amount = argv[optind];
1203 path = argv[optind + 1];
1204
1205 len = strlen(amount);
1206 if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1207 error("resize value too long (%s)", amount);
1208 return 1;
1209 }
1210
1211 res = stat(path, &st);
1212 if (res < 0) {
1213 error("resize: cannot stat %s: %s", path, strerror(errno));
1214 return 1;
1215 }
1216 if (!S_ISDIR(st.st_mode)) {
1217 error("resize works on mounted filesystems and accepts only\n"
1218 "directories as argument. Passing file containing a btrfs image\n"
1219 "would resize the underlying filesystem instead of the image.\n");
1220 return 1;
1221 }
1222
1223 fd = btrfs_open_dir(path, &dirstream, 1);
1224 if (fd < 0)
1225 return 1;
1226
1227 printf("Resize '%s' of '%s'\n", path, amount);
1228 memset(&args, 0, sizeof(args));
1229 strncpy_null(args.name, amount);
1230 res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1231 e = errno;
1232 close_file_or_dir(fd, dirstream);
1233 if( res < 0 ){
1234 switch (e) {
1235 case EFBIG:
1236 error("unable to resize '%s': no enough free space",
1237 path);
1238 break;
1239 default:
1240 error("unable to resize '%s': %s", path, strerror(e));
1241 break;
1242 }
1243 return 1;
1244 } else if (res > 0) {
1245 const char *err_str = btrfs_err_str(res);
1246
1247 if (err_str) {
1248 error("resizing of '%s' failed: %s", path, err_str);
1249 } else {
1250 error("resizing of '%s' failed: unknown error %d",
1251 path, res);
1252 }
1253 return 1;
1254 }
1255 return 0;
1256 }
1257
1258 static const char * const cmd_filesystem_label_usage[] = {
1259 "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1260 "Get or change the label of a filesystem",
1261 "With one argument, get the label of filesystem on <device>.",
1262 "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1263 NULL
1264 };
1265
1266 static int cmd_filesystem_label(int argc, char **argv)
1267 {
1268 clean_args_no_options(argc, argv, cmd_filesystem_label_usage);
1269
1270 if (check_argc_min(argc - optind, 1) ||
1271 check_argc_max(argc - optind, 2))
1272 usage(cmd_filesystem_label_usage);
1273
1274 if (argc - optind > 1) {
1275 return set_label(argv[optind], argv[optind + 1]);
1276 } else {
1277 char label[BTRFS_LABEL_SIZE];
1278 int ret;
1279
1280 ret = get_label(argv[optind], label);
1281 if (!ret)
1282 fprintf(stdout, "%s\n", label);
1283
1284 return ret;
1285 }
1286 }
1287
1288 static const char filesystem_cmd_group_info[] =
1289 "overall filesystem tasks and information";
1290
1291 const struct cmd_group filesystem_cmd_group = {
1292 filesystem_cmd_group_usage, filesystem_cmd_group_info, {
1293 { "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
1294 { "du", cmd_filesystem_du, cmd_filesystem_du_usage, NULL, 0 },
1295 { "show", cmd_filesystem_show, cmd_filesystem_show_usage, NULL,
1296 0 },
1297 { "sync", cmd_filesystem_sync, cmd_filesystem_sync_usage, NULL,
1298 0 },
1299 { "defragment", cmd_filesystem_defrag,
1300 cmd_filesystem_defrag_usage, NULL, 0 },
1301 { "balance", cmd_balance, NULL, &balance_cmd_group,
1302 CMD_HIDDEN },
1303 { "resize", cmd_filesystem_resize, cmd_filesystem_resize_usage,
1304 NULL, 0 },
1305 { "label", cmd_filesystem_label, cmd_filesystem_label_usage,
1306 NULL, 0 },
1307 { "usage", cmd_filesystem_usage,
1308 cmd_filesystem_usage_usage, NULL, 0 },
1309
1310 NULL_CMD_STRUCT
1311 }
1312 };
1313
1314 int cmd_filesystem(int argc, char **argv)
1315 {
1316 return handle_command_group(&filesystem_cmd_group, argc, argv);
1317 }
(deprecated) Btrfs progs developments and patch integration