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btrfs-progs: convert: clean up blk_iterate_data handling wrt record_file_blocks
[btrfs-progs-unstable/devel.git] / cmds-filesystem.c
blobb93bb33028f2e360abd53a657eb9f579f6937dda
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
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 return seen ? 1 : 0;
62 }
63
64 static int add_seen_fsid(u8 *fsid)
65 {
66 u8 hash = fsid[0];
67 int slot = hash % SEEN_FSID_HASH_SIZE;
68 struct seen_fsid *seen = seen_fsid_hash[slot];
69 struct seen_fsid *alloc;
70
71 if (!seen)
72 goto insert;
73
74 while (1) {
75 if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
76 return -EEXIST;
77
78 if (!seen->next)
79 break;
80
81 seen = seen->next;
82 }
83
84 insert:
85
86 alloc = malloc(sizeof(*alloc));
87 if (!alloc)
88 return -ENOMEM;
89
90 alloc->next = NULL;
91 memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
92
93 if (seen)
94 seen->next = alloc;
95 else
96 seen_fsid_hash[slot] = alloc;
97
98 return 0;
99 }
100
101 static void free_seen_fsid(void)
102 {
103 int slot;
104 struct seen_fsid *seen;
105 struct seen_fsid *next;
106
107 for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
108 seen = seen_fsid_hash[slot];
109 while (seen) {
110 next = seen->next;
111 free(seen);
112 seen = next;
113 }
114 seen_fsid_hash[slot] = NULL;
115 }
116 }
117
118 static const char * const filesystem_cmd_group_usage[] = {
119 "btrfs filesystem [<group>] <command> [<args>]",
120 NULL
121 };
122
123 static const char * const cmd_filesystem_df_usage[] = {
124 "btrfs filesystem df [options] <path>",
125 "Show space usage information for a mount point",
126 "-b|--raw raw numbers in bytes",
127 "-h|--human-readable",
128 " human friendly numbers, base 1024 (default)",
129 "-H human friendly numbers, base 1000",
130 "--iec use 1024 as a base (KiB, MiB, GiB, TiB)",
131 "--si use 1000 as a base (kB, MB, GB, TB)",
132 "-k|--kbytes show sizes in KiB, or kB with --si",
133 "-m|--mbytes show sizes in MiB, or MB with --si",
134 "-g|--gbytes show sizes in GiB, or GB with --si",
135 "-t|--tbytes show sizes in TiB, or TB with --si",
136 NULL
137 };
138
139 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
140 {
141 u64 count = 0;
142 int ret, e;
143 struct btrfs_ioctl_space_args *sargs;
144
145 sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
146 if (!sargs)
147 return -ENOMEM;
148
149 sargs->space_slots = 0;
150 sargs->total_spaces = 0;
151
152 ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
153 e = errno;
154 if (ret) {
155 fprintf(stderr, "ERROR: couldn't get space info - %s\n",
156 strerror(e));
157 free(sargs);
158 return -e;
159 }
160 /* This really should never happen */
161 if (!sargs->total_spaces) {
162 free(sargs);
163 return -ENOENT;
164 }
165 count = sargs->total_spaces;
166 free(sargs);
167
168 sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
169 (count * sizeof(struct btrfs_ioctl_space_info)));
170 if (!sargs)
171 return -ENOMEM;
172
173 sargs->space_slots = count;
174 sargs->total_spaces = 0;
175 ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
176 e = errno;
177 if (ret) {
178 fprintf(stderr, "ERROR: get space info count %llu - %s\n",
179 count, strerror(e));
180 free(sargs);
181 return -e;
182 }
183 *sargs_ret = sargs;
184 return 0;
185 }
186
187 static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
188 {
189 u64 i;
190 struct btrfs_ioctl_space_info *sp = sargs->spaces;
191
192 for (i = 0; i < sargs->total_spaces; i++, sp++) {
193 printf("%s, %s: total=%s, used=%s\n",
194 btrfs_group_type_str(sp->flags),
195 btrfs_group_profile_str(sp->flags),
196 pretty_size_mode(sp->total_bytes, unit_mode),
197 pretty_size_mode(sp->used_bytes, unit_mode));
198 }
199 }
200
201 static int cmd_filesystem_df(int argc, char **argv)
202 {
203 struct btrfs_ioctl_space_args *sargs = NULL;
204 int ret;
205 int fd;
206 char *path;
207 DIR *dirstream = NULL;
208 unsigned unit_mode = UNITS_DEFAULT;
209
210 while (1) {
211 int c;
212 static const struct option long_options[] = {
213 { "raw", no_argument, NULL, 'b'},
214 { "kbytes", no_argument, NULL, 'k'},
215 { "mbytes", no_argument, NULL, 'm'},
216 { "gbytes", no_argument, NULL, 'g'},
217 { "tbytes", no_argument, NULL, 't'},
218 { "si", no_argument, NULL, GETOPT_VAL_SI},
219 { "iec", no_argument, NULL, GETOPT_VAL_IEC},
220 { "human-readable", no_argument, NULL,
221 GETOPT_VAL_HUMAN_READABLE},
222 { NULL, 0, NULL, 0 }
223 };
224
225 c = getopt_long(argc, argv, "bhHkmgt", long_options, NULL);
226 if (c < 0)
227 break;
228 switch (c) {
229 case 'b':
230 unit_mode = UNITS_RAW;
231 break;
232 case 'k':
233 units_set_base(&unit_mode, UNITS_KBYTES);
234 break;
235 case 'm':
236 units_set_base(&unit_mode, UNITS_MBYTES);
237 break;
238 case 'g':
239 units_set_base(&unit_mode, UNITS_GBYTES);
240 break;
241 case 't':
242 units_set_base(&unit_mode, UNITS_TBYTES);
243 break;
244 case GETOPT_VAL_HUMAN_READABLE:
245 case 'h':
246 unit_mode = UNITS_HUMAN_BINARY;
247 break;
248 case 'H':
249 unit_mode = UNITS_HUMAN_DECIMAL;
250 break;
251 case GETOPT_VAL_SI:
252 units_set_mode(&unit_mode, UNITS_DECIMAL);
253 break;
254 case GETOPT_VAL_IEC:
255 units_set_mode(&unit_mode, UNITS_BINARY);
256 break;
257 default:
258 usage(cmd_filesystem_df_usage);
259 }
260 }
261
262 if (check_argc_exact(argc, optind + 1))
263 usage(cmd_filesystem_df_usage);
264
265 path = argv[optind];
266
267 fd = open_file_or_dir(path, &dirstream);
268 if (fd < 0) {
269 fprintf(stderr, "ERROR: can't access '%s'\n", path);
270 return 1;
271 }
272 ret = get_df(fd, &sargs);
273
274 if (ret == 0) {
275 print_df(sargs, unit_mode);
276 free(sargs);
277 } else {
278 fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
279 }
280
281 close_file_or_dir(fd, dirstream);
282 return !!ret;
283 }
284
285 static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
286 char *search)
287 {
288 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
289 int search_len = strlen(search);
290
291 search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
292 uuid_unparse(fsid, uuidbuf);
293 if (!strncmp(uuidbuf, search, search_len))
294 return 1;
295
296 if (strlen(label) && strcmp(label, search) == 0)
297 return 1;
298
299 if (strcmp(mnt, search) == 0)
300 return 1;
301
302 return 0;
303 }
304
305 static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
306 {
307 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
308 struct list_head *cur;
309 struct btrfs_device *device;
310 int search_len = strlen(search);
311
312 search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
313 uuid_unparse(fs_devices->fsid, uuidbuf);
314 if (!strncmp(uuidbuf, search, search_len))
315 return 1;
316
317 list_for_each(cur, &fs_devices->devices) {
318 device = list_entry(cur, struct btrfs_device, dev_list);
319 if ((device->label && strcmp(device->label, search) == 0) ||
320 strcmp(device->name, search) == 0)
321 return 1;
322 }
323 return 0;
324 }
325
326 /*
327 * Sort devices by devid, ascending
328 */
329 static int cmp_device_id(void *priv, struct list_head *a,
330 struct list_head *b)
331 {
332 const struct btrfs_device *da = list_entry(a, struct btrfs_device,
333 dev_list);
334 const struct btrfs_device *db = list_entry(b, struct btrfs_device,
335 dev_list);
336
337 return da->devid < db->devid ? -1 :
338 da->devid > db->devid ? 1 : 0;
339 }
340
341 static void splice_device_list(struct list_head *seed_devices,
342 struct list_head *all_devices)
343 {
344 struct btrfs_device *in_all, *next_all;
345 struct btrfs_device *in_seed, *next_seed;
346
347 list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
348 list_for_each_entry_safe(in_seed, next_seed, seed_devices,
349 dev_list) {
350 if (in_all->devid == in_seed->devid) {
351 /*
352 * When do dev replace in a sprout fs
353 * to a dev in its seed fs, the replacing
354 * dev will reside in the sprout fs and
355 * the replaced dev will still exist
356 * in the seed fs.
357 * So pick the latest one when showing
358 * the sprout fs.
359 */
360 if (in_all->generation
361 < in_seed->generation) {
362 list_del(&in_all->dev_list);
363 free(in_all);
364 } else if (in_all->generation
365 > in_seed->generation) {
366 list_del(&in_seed->dev_list);
367 free(in_seed);
368 }
369 break;
370 }
371 }
372 }
373
374 list_splice(seed_devices, all_devices);
375 }
376
377 static void print_devices(struct btrfs_fs_devices *fs_devices,
378 u64 *devs_found)
379 {
380 struct btrfs_device *device;
381 struct btrfs_fs_devices *cur_fs;
382 struct list_head *all_devices;
383
384 all_devices = &fs_devices->devices;
385 cur_fs = fs_devices->seed;
386 /* add all devices of seed fs to the fs to be printed */
387 while (cur_fs) {
388 splice_device_list(&cur_fs->devices, all_devices);
389 cur_fs = cur_fs->seed;
390 }
391
392 list_sort(NULL, all_devices, cmp_device_id);
393 list_for_each_entry(device, all_devices, dev_list) {
394 printf("\tdevid %4llu size %s used %s path %s\n",
395 (unsigned long long)device->devid,
396 pretty_size(device->total_bytes),
397 pretty_size(device->bytes_used), device->name);
398
399 (*devs_found)++;
400 }
401 }
402
403 static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
404 {
405 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
406 struct btrfs_device *device;
407 u64 devs_found = 0;
408 u64 total;
409
410 if (add_seen_fsid(fs_devices->fsid))
411 return;
412
413 uuid_unparse(fs_devices->fsid, uuidbuf);
414 device = list_entry(fs_devices->devices.next, struct btrfs_device,
415 dev_list);
416 if (device->label && device->label[0])
417 printf("Label: '%s' ", device->label);
418 else
419 printf("Label: none ");
420
421 total = device->total_devs;
422 printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
423 (unsigned long long)total,
424 pretty_size(device->super_bytes_used));
425
426 print_devices(fs_devices, &devs_found);
427
428 if (devs_found < total) {
429 printf("\t*** Some devices missing\n");
430 }
431 printf("\n");
432 }
433
434 /* adds up all the used spaces as reported by the space info ioctl
435 */
436 static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
437 {
438 u64 ret = 0;
439 int i;
440 for (i = 0; i < si->total_spaces; i++)
441 ret += si->spaces[i].used_bytes;
442 return ret;
443 }
444
445 static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
446 struct btrfs_ioctl_dev_info_args *dev_info,
447 struct btrfs_ioctl_space_args *space_info,
448 char *label, char *path)
449 {
450 int i;
451 int fd;
452 int missing = 0;
453 char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
454 struct btrfs_ioctl_dev_info_args *tmp_dev_info;
455 int ret;
456
457 ret = add_seen_fsid(fs_info->fsid);
458 if (ret == -EEXIST)
459 return 0;
460 else if (ret)
461 return ret;
462
463 uuid_unparse(fs_info->fsid, uuidbuf);
464 if (label && strlen(label))
465 printf("Label: '%s' ", label);
466 else
467 printf("Label: none ");
468
469 printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
470 fs_info->num_devices,
471 pretty_size(calc_used_bytes(space_info)));
472
473 for (i = 0; i < fs_info->num_devices; i++) {
474 char *canonical_path;
475
476 tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
477
478 /* Add check for missing devices even mounted */
479 fd = open((char *)tmp_dev_info->path, O_RDONLY);
480 if (fd < 0) {
481 missing = 1;
482 continue;
483 }
484 close(fd);
485 canonical_path = canonicalize_path((char *)tmp_dev_info->path);
486 printf("\tdevid %4llu size %s used %s path %s\n",
487 tmp_dev_info->devid,
488 pretty_size(tmp_dev_info->total_bytes),
489 pretty_size(tmp_dev_info->bytes_used),
490 canonical_path);
491
492 free(canonical_path);
493 }
494
495 if (missing)
496 printf("\t*** Some devices missing\n");
497 printf("\n");
498 return 0;
499 }
500
501 static int btrfs_scan_kernel(void *search)
502 {
503 int ret = 0, fd;
504 int found = 0;
505 FILE *f;
506 struct mntent *mnt;
507 struct btrfs_ioctl_fs_info_args fs_info_arg;
508 struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
509 struct btrfs_ioctl_space_args *space_info_arg = NULL;
510 char label[BTRFS_LABEL_SIZE];
511
512 f = setmntent("/proc/self/mounts", "r");
513 if (f == NULL)
514 return 1;
515
516 memset(label, 0, sizeof(label));
517 while ((mnt = getmntent(f)) != NULL) {
518 if (strcmp(mnt->mnt_type, "btrfs"))
519 continue;
520 ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
521 &dev_info_arg);
522 if (ret) {
523 kfree(dev_info_arg);
524 goto out;
525 }
526
527 if (get_label_mounted(mnt->mnt_dir, label)) {
528 kfree(dev_info_arg);
529 goto out;
530 }
531 if (search && !match_search_item_kernel(fs_info_arg.fsid,
532 mnt->mnt_dir, label, search)) {
533 kfree(dev_info_arg);
534 continue;
535 }
536
537 fd = open(mnt->mnt_dir, O_RDONLY);
538 if ((fd != -1) && !get_df(fd, &space_info_arg)) {
539 print_one_fs(&fs_info_arg, dev_info_arg,
540 space_info_arg, label, mnt->mnt_dir);
541 kfree(space_info_arg);
542 memset(label, 0, sizeof(label));
543 found = 1;
544 }
545 if (fd != -1)
546 close(fd);
547 kfree(dev_info_arg);
548 }
549
550 out:
551 endmntent(f);
552 return !found;
553 }
554
555 static int dev_to_fsid(char *dev, __u8 *fsid)
556 {
557 struct btrfs_super_block *disk_super;
558 char *buf;
559 int ret;
560 int fd;
561
562 buf = malloc(4096);
563 if (!buf)
564 return -ENOMEM;
565
566 fd = open(dev, O_RDONLY);
567 if (fd < 0) {
568 ret = -errno;
569 free(buf);
570 return ret;
571 }
572
573 disk_super = (struct btrfs_super_block *)buf;
574 ret = btrfs_read_dev_super(fd, disk_super,
575 BTRFS_SUPER_INFO_OFFSET, 0);
576 if (ret)
577 goto out;
578
579 memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
580 ret = 0;
581
582 out:
583 close(fd);
584 free(buf);
585 return ret;
586 }
587
588 static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
589 {
590 struct btrfs_fs_devices *cur_seed, *next_seed;
591 struct btrfs_device *device;
592
593 while (!list_empty(&fs_devices->devices)) {
594 device = list_entry(fs_devices->devices.next,
595 struct btrfs_device, dev_list);
596 list_del(&device->dev_list);
597
598 free(device->name);
599 free(device->label);
600 free(device);
601 }
602
603 /* free seed fs chain */
604 cur_seed = fs_devices->seed;
605 fs_devices->seed = NULL;
606 while (cur_seed) {
607 next_seed = cur_seed->seed;
608 free(cur_seed);
609
610 cur_seed = next_seed;
611 }
612
613 list_del(&fs_devices->list);
614 free(fs_devices);
615 }
616
617 static int copy_device(struct btrfs_device *dst,
618 struct btrfs_device *src)
619 {
620 dst->devid = src->devid;
621 memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
622 if (src->name == NULL)
623 dst->name = NULL;
624 else {
625 dst->name = strdup(src->name);
626 if (!dst->name)
627 return -ENOMEM;
628 }
629 if (src->label == NULL)
630 dst->label = NULL;
631 else {
632 dst->label = strdup(src->label);
633 if (!dst->label) {
634 free(dst->name);
635 return -ENOMEM;
636 }
637 }
638 dst->total_devs = src->total_devs;
639 dst->super_bytes_used = src->super_bytes_used;
640 dst->total_bytes = src->total_bytes;
641 dst->bytes_used = src->bytes_used;
642 dst->generation = src->generation;
643
644 return 0;
645 }
646
647 static int copy_fs_devices(struct btrfs_fs_devices *dst,
648 struct btrfs_fs_devices *src)
649 {
650 struct btrfs_device *cur_dev, *dev_copy;
651 int ret = 0;
652
653 memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
654 INIT_LIST_HEAD(&dst->devices);
655 dst->seed = NULL;
656
657 list_for_each_entry(cur_dev, &src->devices, dev_list) {
658 dev_copy = malloc(sizeof(*dev_copy));
659 if (!dev_copy) {
660 ret = -ENOMEM;
661 break;
662 }
663
664 ret = copy_device(dev_copy, cur_dev);
665 if (ret) {
666 free(dev_copy);
667 break;
668 }
669
670 list_add(&dev_copy->dev_list, &dst->devices);
671 dev_copy->fs_devices = dst;
672 }
673
674 return ret;
675 }
676
677 static int find_and_copy_seed(struct btrfs_fs_devices *seed,
678 struct btrfs_fs_devices *copy,
679 struct list_head *fs_uuids) {
680 struct btrfs_fs_devices *cur_fs;
681
682 list_for_each_entry(cur_fs, fs_uuids, list)
683 if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
684 return copy_fs_devices(copy, cur_fs);
685
686 return 1;
687 }
688
689 static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
690 {
691 struct btrfs_device *device;
692 int dev_cnt_total, dev_cnt = 0;
693
694 device = list_first_entry(&fs_devices->devices, struct btrfs_device,
695 dev_list);
696
697 dev_cnt_total = device->total_devs;
698
699 list_for_each_entry(device, &fs_devices->devices, dev_list)
700 dev_cnt++;
701
702 return dev_cnt_total != dev_cnt;
703 }
704
705 static int search_umounted_fs_uuids(struct list_head *all_uuids,
706 char *search, int *found)
707 {
708 struct btrfs_fs_devices *cur_fs, *fs_copy;
709 struct list_head *fs_uuids;
710 int ret = 0;
711
712 fs_uuids = btrfs_scanned_uuids();
713
714 /*
715 * The fs_uuids list is global, and open_ctree_* will
716 * modify it, make a private copy here
717 */
718 list_for_each_entry(cur_fs, fs_uuids, list) {
719 /* don't bother handle all fs, if search target specified */
720 if (search) {
721 if (uuid_search(cur_fs, search) == 0)
722 continue;
723 if (found)
724 *found = 1;
725 }
726
727 /* skip all fs already shown as mounted fs */
728 if (is_seen_fsid(cur_fs->fsid))
729 continue;
730
731 fs_copy = malloc(sizeof(*fs_copy));
732 if (!fs_copy) {
733 ret = -ENOMEM;
734 goto out;
735 }
736
737 ret = copy_fs_devices(fs_copy, cur_fs);
738 if (ret) {
739 free(fs_copy);
740 goto out;
741 }
742
743 list_add(&fs_copy->list, all_uuids);
744 }
745
746 out:
747 return ret;
748 }
749
750 static int map_seed_devices(struct list_head *all_uuids)
751 {
752 struct btrfs_fs_devices *cur_fs, *cur_seed;
753 struct btrfs_fs_devices *seed_copy;
754 struct btrfs_fs_devices *opened_fs;
755 struct btrfs_device *device;
756 struct btrfs_fs_info *fs_info;
757 struct list_head *fs_uuids;
758 int ret = 0;
759
760 fs_uuids = btrfs_scanned_uuids();
761
762 list_for_each_entry(cur_fs, all_uuids, list) {
763 device = list_first_entry(&cur_fs->devices,
764 struct btrfs_device, dev_list);
765 if (!device)
766 continue;
767
768 /* skip fs without seeds */
769 if (!has_seed_devices(cur_fs))
770 continue;
771
772 /*
773 * open_ctree_* detects seed/sprout mapping
774 */
775 fs_info = open_ctree_fs_info(device->name, 0, 0,
776 OPEN_CTREE_PARTIAL);
777 if (!fs_info)
778 continue;
779
780 /*
781 * copy the seed chain under the opened fs
782 */
783 opened_fs = fs_info->fs_devices;
784 cur_seed = cur_fs;
785 while (opened_fs->seed) {
786 seed_copy = malloc(sizeof(*seed_copy));
787 if (!seed_copy) {
788 ret = -ENOMEM;
789 goto fail_out;
790 }
791 ret = find_and_copy_seed(opened_fs->seed, seed_copy,
792 fs_uuids);
793 if (ret) {
794 free(seed_copy);
795 goto fail_out;
796 }
797
798 cur_seed->seed = seed_copy;
799
800 opened_fs = opened_fs->seed;
801 cur_seed = cur_seed->seed;
802 }
803
804 close_ctree(fs_info->chunk_root);
805 }
806
807 out:
808 return ret;
809 fail_out:
810 close_ctree(fs_info->chunk_root);
811 goto out;
812 }
813
814 static const char * const cmd_show_usage[] = {
815 "btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
816 "Show the structure of a filesystem",
817 "-d|--all-devices show only disks under /dev containing btrfs filesystem",
818 "-m|--mounted show only mounted btrfs",
819 "If no argument is given, structure of all present filesystems is shown.",
820 NULL
821 };
822
823 static int cmd_show(int argc, char **argv)
824 {
825 LIST_HEAD(all_uuids);
826 struct btrfs_fs_devices *fs_devices;
827 char *search = NULL;
828 int ret;
829 /* default, search both kernel and udev */
830 int where = -1;
831 int type = 0;
832 char mp[BTRFS_PATH_NAME_MAX + 1];
833 char path[PATH_MAX];
834 __u8 fsid[BTRFS_FSID_SIZE];
835 char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
836 int found = 0;
837
838 while (1) {
839 int c;
840 static const struct option long_options[] = {
841 { "all-devices", no_argument, NULL, 'd'},
842 { "mounted", no_argument, NULL, 'm'},
843 { NULL, 0, NULL, 0 }
844 };
845
846 c = getopt_long(argc, argv, "dm", long_options, NULL);
847 if (c < 0)
848 break;
849 switch (c) {
850 case 'd':
851 where = BTRFS_SCAN_LBLKID;
852 break;
853 case 'm':
854 where = BTRFS_SCAN_MOUNTED;
855 break;
856 default:
857 usage(cmd_show_usage);
858 }
859 }
860
861 if (check_argc_max(argc, optind + 1))
862 usage(cmd_show_usage);
863
864 if (argc > optind) {
865 search = argv[optind];
866 if (strlen(search) == 0)
867 usage(cmd_show_usage);
868 type = check_arg_type(search);
869
870 /*
871 * For search is a device:
872 * realpath do /dev/mapper/XX => /dev/dm-X
873 * which is required by BTRFS_SCAN_DEV
874 * For search is a mountpoint:
875 * realpath do /mnt/btrfs/ => /mnt/btrfs
876 * which shall be recognized by btrfs_scan_kernel()
877 */
878 if (realpath(search, path))
879 search = path;
880
881 /*
882 * Needs special handling if input arg is block dev And if
883 * input arg is mount-point just print it right away
884 */
885 if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
886 ret = get_btrfs_mount(search, mp, sizeof(mp));
887 if (!ret) {
888 /* given block dev is mounted */
889 search = mp;
890 type = BTRFS_ARG_MNTPOINT;
891 } else {
892 ret = dev_to_fsid(search, fsid);
893 if (ret) {
894 fprintf(stderr,
895 "ERROR: No btrfs on %s\n",
896 search);
897 return 1;
898 }
899 uuid_unparse(fsid, uuid_buf);
900 search = uuid_buf;
901 type = BTRFS_ARG_UUID;
902 goto devs_only;
903 }
904 }
905 }
906
907 if (where == BTRFS_SCAN_LBLKID)
908 goto devs_only;
909
910 /* show mounted btrfs */
911 ret = btrfs_scan_kernel(search);
912 if (search && !ret) {
913 /* since search is found we are done */
914 goto out;
915 }
916
917 /* shows mounted only */
918 if (where == BTRFS_SCAN_MOUNTED)
919 goto out;
920
921 devs_only:
922 ret = btrfs_scan_lblkid();
923
924 if (ret) {
925 fprintf(stderr, "ERROR: %d while scanning\n", ret);
926 return 1;
927 }
928
929 ret = search_umounted_fs_uuids(&all_uuids, search, &found);
930 if (ret < 0) {
931 fprintf(stderr,
932 "ERROR: %d while searching target device\n", ret);
933 return 1;
934 }
935
936 /*
937 * The seed/sprout mapping are not detected yet,
938 * do mapping build for all umounted fs
939 */
940 ret = map_seed_devices(&all_uuids);
941 if (ret) {
942 fprintf(stderr,
943 "ERROR: %d while mapping seed devices\n", ret);
944 return 1;
945 }
946
947 list_for_each_entry(fs_devices, &all_uuids, list)
948 print_one_uuid(fs_devices);
949
950 if (search && !found)
951 ret = 1;
952
953 while (!list_empty(&all_uuids)) {
954 fs_devices = list_entry(all_uuids.next,
955 struct btrfs_fs_devices, list);
956 free_fs_devices(fs_devices);
957 }
958 out:
959 printf("%s\n", PACKAGE_STRING);
960 free_seen_fsid();
961 return ret;
962 }
963
964 static const char * const cmd_sync_usage[] = {
965 "btrfs filesystem sync <path>",
966 "Force a sync on a filesystem",
967 NULL
968 };
969
970 static int cmd_sync(int argc, char **argv)
971 {
972 int fd, res, e;
973 char *path;
974 DIR *dirstream = NULL;
975
976 if (check_argc_exact(argc, 2))
977 usage(cmd_sync_usage);
978
979 path = argv[1];
980
981 fd = open_file_or_dir(path, &dirstream);
982 if (fd < 0) {
983 fprintf(stderr, "ERROR: can't access '%s'\n", path);
984 return 1;
985 }
986
987 printf("FSSync '%s'\n", path);
988 res = ioctl(fd, BTRFS_IOC_SYNC);
989 e = errno;
990 close_file_or_dir(fd, dirstream);
991 if( res < 0 ){
992 fprintf(stderr, "ERROR: unable to fs-syncing '%s' - %s\n",
993 path, strerror(e));
994 return 1;
995 }
996
997 return 0;
998 }
999
1000 static int parse_compress_type(char *s)
1001 {
1002 if (strcmp(optarg, "zlib") == 0)
1003 return BTRFS_COMPRESS_ZLIB;
1004 else if (strcmp(optarg, "lzo") == 0)
1005 return BTRFS_COMPRESS_LZO;
1006 else {
1007 fprintf(stderr, "Unknown compress type %s\n", s);
1008 exit(1);
1009 };
1010 }
1011
1012 static const char * const cmd_defrag_usage[] = {
1013 "btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
1014 "Defragment a file or a directory",
1015 "",
1016 "-v be verbose",
1017 "-r defragment files recursively",
1018 "-c[zlib,lzo] compress the file while defragmenting",
1019 "-f flush data to disk immediately after defragmenting",
1020 "-s start defragment only from byte onward",
1021 "-l len defragment only up to len bytes",
1022 "-t size minimal size of file to be considered for defragmenting",
1023 NULL
1024 };
1025
1026 static int do_defrag(int fd, int fancy_ioctl,
1027 struct btrfs_ioctl_defrag_range_args *range)
1028 {
1029 int ret;
1030
1031 if (!fancy_ioctl)
1032 ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
1033 else
1034 ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
1035
1036 return ret;
1037 }
1038
1039 static int defrag_global_fancy_ioctl;
1040 static struct btrfs_ioctl_defrag_range_args defrag_global_range;
1041 static int defrag_global_verbose;
1042 static int defrag_global_errors;
1043 static int defrag_callback(const char *fpath, const struct stat *sb,
1044 int typeflag, struct FTW *ftwbuf)
1045 {
1046 int ret = 0;
1047 int e = 0;
1048 int fd = 0;
1049
1050 if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
1051 if (defrag_global_verbose)
1052 printf("%s\n", fpath);
1053 fd = open(fpath, O_RDWR);
1054 e = errno;
1055 if (fd < 0)
1056 goto error;
1057 ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
1058 e = errno;
1059 close(fd);
1060 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1061 fprintf(stderr, "ERROR: defrag range ioctl not "
1062 "supported in this kernel, please try "
1063 "without any options.\n");
1064 defrag_global_errors++;
1065 return ENOTTY;
1066 }
1067 if (ret)
1068 goto error;
1069 }
1070 return 0;
1071
1072 error:
1073 fprintf(stderr, "ERROR: defrag failed on %s - %s\n", fpath, strerror(e));
1074 defrag_global_errors++;
1075 return 0;
1076 }
1077
1078 static int cmd_defrag(int argc, char **argv)
1079 {
1080 int fd;
1081 int flush = 0;
1082 u64 start = 0;
1083 u64 len = (u64)-1;
1084 u32 thresh = 0;
1085 int i;
1086 int recursive = 0;
1087 int ret = 0;
1088 struct btrfs_ioctl_defrag_range_args range;
1089 int e = 0;
1090 int compress_type = BTRFS_COMPRESS_NONE;
1091 DIR *dirstream;
1092
1093 defrag_global_errors = 0;
1094 defrag_global_verbose = 0;
1095 defrag_global_errors = 0;
1096 defrag_global_fancy_ioctl = 0;
1097 optind = 1;
1098 while(1) {
1099 int c = getopt(argc, argv, "vrc::fs:l:t:");
1100 if (c < 0)
1101 break;
1102
1103 switch(c) {
1104 case 'c':
1105 compress_type = BTRFS_COMPRESS_ZLIB;
1106 if (optarg)
1107 compress_type = parse_compress_type(optarg);
1108 defrag_global_fancy_ioctl = 1;
1109 break;
1110 case 'f':
1111 flush = 1;
1112 defrag_global_fancy_ioctl = 1;
1113 break;
1114 case 'v':
1115 defrag_global_verbose = 1;
1116 break;
1117 case 's':
1118 start = parse_size(optarg);
1119 defrag_global_fancy_ioctl = 1;
1120 break;
1121 case 'l':
1122 len = parse_size(optarg);
1123 defrag_global_fancy_ioctl = 1;
1124 break;
1125 case 't':
1126 thresh = parse_size(optarg);
1127 defrag_global_fancy_ioctl = 1;
1128 break;
1129 case 'r':
1130 recursive = 1;
1131 break;
1132 default:
1133 usage(cmd_defrag_usage);
1134 }
1135 }
1136
1137 if (check_argc_min(argc - optind, 1))
1138 usage(cmd_defrag_usage);
1139
1140 memset(&defrag_global_range, 0, sizeof(range));
1141 defrag_global_range.start = start;
1142 defrag_global_range.len = len;
1143 defrag_global_range.extent_thresh = thresh;
1144 if (compress_type) {
1145 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
1146 defrag_global_range.compress_type = compress_type;
1147 }
1148 if (flush)
1149 defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
1150
1151 for (i = optind; i < argc; i++) {
1152 struct stat st;
1153
1154 dirstream = NULL;
1155 fd = open_file_or_dir(argv[i], &dirstream);
1156 if (fd < 0) {
1157 fprintf(stderr, "ERROR: failed to open %s - %s\n", argv[i],
1158 strerror(errno));
1159 defrag_global_errors++;
1160 close_file_or_dir(fd, dirstream);
1161 continue;
1162 }
1163 if (fstat(fd, &st)) {
1164 fprintf(stderr, "ERROR: failed to stat %s - %s\n",
1165 argv[i], strerror(errno));
1166 defrag_global_errors++;
1167 close_file_or_dir(fd, dirstream);
1168 continue;
1169 }
1170 if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
1171 fprintf(stderr,
1172 "ERROR: %s is not a directory or a regular file\n",
1173 argv[i]);
1174 defrag_global_errors++;
1175 close_file_or_dir(fd, dirstream);
1176 continue;
1177 }
1178 if (recursive) {
1179 if (S_ISDIR(st.st_mode)) {
1180 ret = nftw(argv[i], defrag_callback, 10,
1181 FTW_MOUNT | FTW_PHYS);
1182 if (ret == ENOTTY)
1183 exit(1);
1184 /* errors are handled in the callback */
1185 ret = 0;
1186 } else {
1187 if (defrag_global_verbose)
1188 printf("%s\n", argv[i]);
1189 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1190 &defrag_global_range);
1191 e = errno;
1192 }
1193 } else {
1194 if (defrag_global_verbose)
1195 printf("%s\n", argv[i]);
1196 ret = do_defrag(fd, defrag_global_fancy_ioctl,
1197 &defrag_global_range);
1198 e = errno;
1199 }
1200 close_file_or_dir(fd, dirstream);
1201 if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
1202 fprintf(stderr, "ERROR: defrag range ioctl not "
1203 "supported in this kernel, please try "
1204 "without any options.\n");
1205 defrag_global_errors++;
1206 break;
1207 }
1208 if (ret) {
1209 fprintf(stderr, "ERROR: defrag failed on %s - %s\n",
1210 argv[i], strerror(e));
1211 defrag_global_errors++;
1212 }
1213 }
1214 if (defrag_global_verbose)
1215 printf("%s\n", PACKAGE_STRING);
1216 if (defrag_global_errors)
1217 fprintf(stderr, "total %d failures\n", defrag_global_errors);
1218
1219 return !!defrag_global_errors;
1220 }
1221
1222 static const char * const cmd_resize_usage[] = {
1223 "btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
1224 "Resize a filesystem",
1225 "If 'max' is passed, the filesystem will occupy all available space",
1226 "on the device 'devid'.",
1227 "[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
1228 NULL
1229 };
1230
1231 static int cmd_resize(int argc, char **argv)
1232 {
1233 struct btrfs_ioctl_vol_args args;
1234 int fd, res, len, e;
1235 char *amount, *path;
1236 DIR *dirstream = NULL;
1237 struct stat st;
1238
1239 if (check_argc_exact(argc, 3))
1240 usage(cmd_resize_usage);
1241
1242 amount = argv[1];
1243 path = argv[2];
1244
1245 len = strlen(amount);
1246 if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
1247 fprintf(stderr, "ERROR: size value too long ('%s)\n",
1248 amount);
1249 return 1;
1250 }
1251
1252 res = stat(path, &st);
1253 if (res < 0) {
1254 fprintf(stderr, "ERROR: resize: cannot stat %s: %s\n",
1255 path, strerror(errno));
1256 return 1;
1257 }
1258 if (!S_ISDIR(st.st_mode)) {
1259 fprintf(stderr,
1260 "ERROR: resize works on mounted filesystems and accepts only\n"
1261 "directories as argument. Passing file containing a btrfs image\n"
1262 "would resize the underlying filesystem instead of the image.\n");
1263 return 1;
1264 }
1265
1266 fd = open_file_or_dir(path, &dirstream);
1267 if (fd < 0) {
1268 fprintf(stderr, "ERROR: can't access '%s'\n", path);
1269 return 1;
1270 }
1271
1272 printf("Resize '%s' of '%s'\n", path, amount);
1273 strncpy_null(args.name, amount);
1274 res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
1275 e = errno;
1276 close_file_or_dir(fd, dirstream);
1277 if( res < 0 ){
1278 fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
1279 path, strerror(e));
1280 return 1;
1281 } else if (res > 0) {
1282 const char *err_str = btrfs_err_str(res);
1283
1284 if (err_str) {
1285 fprintf(stderr, "ERROR: btrfs error resizing '%s' - %s\n",
1286 path, err_str);
1287 } else {
1288 fprintf(stderr,
1289 "ERROR: btrfs error resizing '%s' - unknown btrfs_err_code %d\n",
1290 path, res);
1291 }
1292 return 1;
1293 }
1294 return 0;
1295 }
1296
1297 static const char * const cmd_label_usage[] = {
1298 "btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
1299 "Get or change the label of a filesystem",
1300 "With one argument, get the label of filesystem on <device>.",
1301 "If <newlabel> is passed, set the filesystem label to <newlabel>.",
1302 NULL
1303 };
1304
1305 static int cmd_label(int argc, char **argv)
1306 {
1307 if (check_argc_min(argc, 2) || check_argc_max(argc, 3))
1308 usage(cmd_label_usage);
1309
1310 if (argc > 2) {
1311 return set_label(argv[1], argv[2]);
1312 } else {
1313 char label[BTRFS_LABEL_SIZE];
1314 int ret;
1315
1316 ret = get_label(argv[1], label);
1317 if (!ret)
1318 fprintf(stdout, "%s\n", label);
1319
1320 return ret;
1321 }
1322 }
1323
1324 const struct cmd_group filesystem_cmd_group = {
1325 filesystem_cmd_group_usage, NULL, {
1326 { "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
1327 { "show", cmd_show, cmd_show_usage, NULL, 0 },
1328 { "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
1329 { "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
1330 { "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
1331 { "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
1332 { "label", cmd_label, cmd_label_usage, NULL, 0 },
1333 { "usage", cmd_filesystem_usage,
1334 cmd_filesystem_usage_usage, NULL, 0 },
1335
1336 NULL_CMD_STRUCT
1337 }
1338 };
1339
1340 int cmd_filesystem(int argc, char **argv)
1341 {
1342 return handle_command_group(&filesystem_cmd_group, argc, argv);
1343 }
(deprecated) Btrfs progs developments and patch integration