2 * Copyright (C) 2007 Oracle. All rights reserved.
3 * Copyright (C) 2008 Morey Roof. All rights reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public
7 * License v2 as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public
15 * License along with this program; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 021110-1307, USA.
23 #include <sys/ioctl.h>
24 #include <sys/mount.h>
25 #include <sys/types.h>
27 #include <uuid/uuid.h>
32 #include <linux/loop.h>
33 #include <linux/major.h>
34 #include <linux/kdev_t.h>
36 #include <blkid/blkid.h>
38 #include <sys/statfs.h>
39 #include <linux/magic.h>
42 #include "kerncompat.h"
43 #include "radix-tree.h"
46 #include "transaction.h"
54 #define BLKDISCARD _IO(0x12,119)
57 static int btrfs_scan_done = 0;
59 static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
61 const char *get_argv0_buf(void)
66 void fixup_argv0(char **argv, const char *token)
68 int len = strlen(argv0_buf);
70 snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
74 void set_argv0(char **argv)
76 strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
77 argv0_buf[sizeof(argv0_buf) - 1] = 0;
80 int check_argc_exact(int nargs, int expected)
83 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
85 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
87 return nargs != expected;
90 int check_argc_min(int nargs, int expected)
92 if (nargs < expected) {
93 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
100 int check_argc_max(int nargs, int expected)
102 if (nargs > expected) {
103 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
112 * Discard the given range in one go
114 static int discard_range(int fd, u64 start, u64 len)
116 u64 range[2] = { start, len };
118 if (ioctl(fd, BLKDISCARD, &range) < 0)
124 * Discard blocks in the given range in 1G chunks, the process is interruptible
126 static int discard_blocks(int fd, u64 start, u64 len)
130 u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
133 ret = discard_range(fd, start, chunk_size);
143 static u64 reference_root_table[] = {
144 [1] = BTRFS_ROOT_TREE_OBJECTID,
145 [2] = BTRFS_EXTENT_TREE_OBJECTID,
146 [3] = BTRFS_CHUNK_TREE_OBJECTID,
147 [4] = BTRFS_DEV_TREE_OBJECTID,
148 [5] = BTRFS_FS_TREE_OBJECTID,
149 [6] = BTRFS_CSUM_TREE_OBJECTID,
152 int test_uuid_unique(char *fs_uuid)
155 blkid_dev_iterate iter = NULL;
156 blkid_dev dev = NULL;
157 blkid_cache cache = NULL;
159 if (blkid_get_cache(&cache, NULL) < 0) {
160 printf("ERROR: lblkid cache get failed\n");
163 blkid_probe_all(cache);
164 iter = blkid_dev_iterate_begin(cache);
165 blkid_dev_set_search(iter, "UUID", fs_uuid);
167 while (blkid_dev_next(iter, &dev) == 0) {
168 dev = blkid_verify(cache, dev);
175 blkid_dev_iterate_end(iter);
176 blkid_put_cache(cache);
182 * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
184 int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
186 struct btrfs_super_block super;
187 struct extent_buffer *buf;
188 struct btrfs_root_item root_item;
189 struct btrfs_disk_key disk_key;
190 struct btrfs_extent_item *extent_item;
191 struct btrfs_inode_item *inode_item;
192 struct btrfs_chunk *chunk;
193 struct btrfs_dev_item *dev_item;
194 struct btrfs_dev_extent *dev_extent;
195 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
205 int skinny_metadata = !!(cfg->features &
206 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
209 buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
213 first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
214 first_free &= ~((u64)cfg->sectorsize - 1);
216 memset(&super, 0, sizeof(super));
218 num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
219 if (cfg->fs_uuid && *cfg->fs_uuid) {
220 if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
221 fprintf(stderr, "could not parse UUID: %s\n",
226 if (!test_uuid_unique(cfg->fs_uuid)) {
227 fprintf(stderr, "non-unique UUID: %s\n", cfg->fs_uuid);
232 uuid_generate(super.fsid);
234 uuid_unparse(super.fsid, cfg->fs_uuid);
236 uuid_generate(super.dev_item.uuid);
237 uuid_generate(chunk_tree_uuid);
239 btrfs_set_super_bytenr(&super, cfg->blocks[0]);
240 btrfs_set_super_num_devices(&super, 1);
241 btrfs_set_super_magic(&super, BTRFS_MAGIC);
242 btrfs_set_super_generation(&super, 1);
243 btrfs_set_super_root(&super, cfg->blocks[1]);
244 btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
245 btrfs_set_super_total_bytes(&super, num_bytes);
246 btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
247 btrfs_set_super_sectorsize(&super, cfg->sectorsize);
248 btrfs_set_super_leafsize(&super, cfg->nodesize);
249 btrfs_set_super_nodesize(&super, cfg->nodesize);
250 btrfs_set_super_stripesize(&super, cfg->stripesize);
251 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
252 btrfs_set_super_chunk_root_generation(&super, 1);
253 btrfs_set_super_cache_generation(&super, -1);
254 btrfs_set_super_incompat_flags(&super, cfg->features);
256 strncpy(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
258 /* create the tree of root objects */
259 memset(buf->data, 0, cfg->nodesize);
260 buf->len = cfg->nodesize;
261 btrfs_set_header_bytenr(buf, cfg->blocks[1]);
262 btrfs_set_header_nritems(buf, 4);
263 btrfs_set_header_generation(buf, 1);
264 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
265 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
266 write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
269 write_extent_buffer(buf, chunk_tree_uuid,
270 btrfs_header_chunk_tree_uuid(buf),
273 /* create the items for the root tree */
274 memset(&root_item, 0, sizeof(root_item));
275 inode_item = &root_item.inode;
276 btrfs_set_stack_inode_generation(inode_item, 1);
277 btrfs_set_stack_inode_size(inode_item, 3);
278 btrfs_set_stack_inode_nlink(inode_item, 1);
279 btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
280 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
281 btrfs_set_root_refs(&root_item, 1);
282 btrfs_set_root_used(&root_item, cfg->nodesize);
283 btrfs_set_root_generation(&root_item, 1);
285 memset(&disk_key, 0, sizeof(disk_key));
286 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
287 btrfs_set_disk_key_offset(&disk_key, 0);
290 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
291 btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
292 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
293 btrfs_set_item_key(buf, &disk_key, nritems);
294 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
295 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
297 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
298 nritems), sizeof(root_item));
301 itemoff = itemoff - sizeof(root_item);
302 btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
303 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
304 btrfs_set_item_key(buf, &disk_key, nritems);
305 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
306 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
308 write_extent_buffer(buf, &root_item,
309 btrfs_item_ptr_offset(buf, nritems),
313 itemoff = itemoff - sizeof(root_item);
314 btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
315 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
316 btrfs_set_item_key(buf, &disk_key, nritems);
317 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
318 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
320 write_extent_buffer(buf, &root_item,
321 btrfs_item_ptr_offset(buf, nritems),
325 itemoff = itemoff - sizeof(root_item);
326 btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
327 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
328 btrfs_set_item_key(buf, &disk_key, nritems);
329 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
330 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
332 write_extent_buffer(buf, &root_item,
333 btrfs_item_ptr_offset(buf, nritems),
338 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
339 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
340 if (ret != cfg->nodesize) {
341 ret = (ret < 0 ? -errno : -EIO);
345 /* create the items for the extent tree */
346 memset(buf->data + sizeof(struct btrfs_header), 0,
347 cfg->nodesize - sizeof(struct btrfs_header));
349 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
350 for (i = 1; i < 7; i++) {
351 item_size = sizeof(struct btrfs_extent_item);
352 if (!skinny_metadata)
353 item_size += sizeof(struct btrfs_tree_block_info);
355 BUG_ON(cfg->blocks[i] < first_free);
356 BUG_ON(cfg->blocks[i] < cfg->blocks[i - 1]);
358 /* create extent item */
359 itemoff -= item_size;
360 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
361 if (skinny_metadata) {
362 btrfs_set_disk_key_type(&disk_key,
363 BTRFS_METADATA_ITEM_KEY);
364 btrfs_set_disk_key_offset(&disk_key, 0);
366 btrfs_set_disk_key_type(&disk_key,
367 BTRFS_EXTENT_ITEM_KEY);
368 btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
370 btrfs_set_item_key(buf, &disk_key, nritems);
371 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
373 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
375 extent_item = btrfs_item_ptr(buf, nritems,
376 struct btrfs_extent_item);
377 btrfs_set_extent_refs(buf, extent_item, 1);
378 btrfs_set_extent_generation(buf, extent_item, 1);
379 btrfs_set_extent_flags(buf, extent_item,
380 BTRFS_EXTENT_FLAG_TREE_BLOCK);
383 /* create extent ref */
384 ref_root = reference_root_table[i];
385 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
386 btrfs_set_disk_key_offset(&disk_key, ref_root);
387 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
388 btrfs_set_item_key(buf, &disk_key, nritems);
389 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
391 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
394 btrfs_set_header_bytenr(buf, cfg->blocks[2]);
395 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
396 btrfs_set_header_nritems(buf, nritems);
397 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
398 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
399 if (ret != cfg->nodesize) {
400 ret = (ret < 0 ? -errno : -EIO);
404 /* create the chunk tree */
405 memset(buf->data + sizeof(struct btrfs_header), 0,
406 cfg->nodesize - sizeof(struct btrfs_header));
408 item_size = sizeof(*dev_item);
409 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
411 /* first device 1 (there is no device 0) */
412 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
413 btrfs_set_disk_key_offset(&disk_key, 1);
414 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
415 btrfs_set_item_key(buf, &disk_key, nritems);
416 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
417 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
419 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
420 btrfs_set_device_id(buf, dev_item, 1);
421 btrfs_set_device_generation(buf, dev_item, 0);
422 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
423 btrfs_set_device_bytes_used(buf, dev_item,
424 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
425 btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
426 btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
427 btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
428 btrfs_set_device_type(buf, dev_item, 0);
430 write_extent_buffer(buf, super.dev_item.uuid,
431 (unsigned long)btrfs_device_uuid(dev_item),
433 write_extent_buffer(buf, super.fsid,
434 (unsigned long)btrfs_device_fsid(dev_item),
436 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
440 item_size = btrfs_chunk_item_size(1);
441 itemoff = itemoff - item_size;
443 /* then we have chunk 0 */
444 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
445 btrfs_set_disk_key_offset(&disk_key, 0);
446 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
447 btrfs_set_item_key(buf, &disk_key, nritems);
448 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
449 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
451 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
452 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
453 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
454 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
455 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
456 btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
457 btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
458 btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
459 btrfs_set_chunk_num_stripes(buf, chunk, 1);
460 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
461 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
464 write_extent_buffer(buf, super.dev_item.uuid,
465 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
468 /* copy the key for the chunk to the system array */
469 ptr = super.sys_chunk_array;
470 array_size = sizeof(disk_key);
472 memcpy(ptr, &disk_key, sizeof(disk_key));
473 ptr += sizeof(disk_key);
475 /* copy the chunk to the system array */
476 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
477 array_size += item_size;
479 btrfs_set_super_sys_array_size(&super, array_size);
481 btrfs_set_header_bytenr(buf, cfg->blocks[3]);
482 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
483 btrfs_set_header_nritems(buf, nritems);
484 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
485 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
486 if (ret != cfg->nodesize) {
487 ret = (ret < 0 ? -errno : -EIO);
491 /* create the device tree */
492 memset(buf->data + sizeof(struct btrfs_header), 0,
493 cfg->nodesize - sizeof(struct btrfs_header));
495 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
496 sizeof(struct btrfs_dev_extent);
498 btrfs_set_disk_key_objectid(&disk_key, 1);
499 btrfs_set_disk_key_offset(&disk_key, 0);
500 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
501 btrfs_set_item_key(buf, &disk_key, nritems);
502 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
503 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
504 sizeof(struct btrfs_dev_extent));
505 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
506 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
507 BTRFS_CHUNK_TREE_OBJECTID);
508 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
509 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
510 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
512 write_extent_buffer(buf, chunk_tree_uuid,
513 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
516 btrfs_set_dev_extent_length(buf, dev_extent,
517 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
520 btrfs_set_header_bytenr(buf, cfg->blocks[4]);
521 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
522 btrfs_set_header_nritems(buf, nritems);
523 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
524 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
525 if (ret != cfg->nodesize) {
526 ret = (ret < 0 ? -errno : -EIO);
530 /* create the FS root */
531 memset(buf->data + sizeof(struct btrfs_header), 0,
532 cfg->nodesize - sizeof(struct btrfs_header));
533 btrfs_set_header_bytenr(buf, cfg->blocks[5]);
534 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
535 btrfs_set_header_nritems(buf, 0);
536 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
537 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
538 if (ret != cfg->nodesize) {
539 ret = (ret < 0 ? -errno : -EIO);
542 /* finally create the csum root */
543 memset(buf->data + sizeof(struct btrfs_header), 0,
544 cfg->nodesize - sizeof(struct btrfs_header));
545 btrfs_set_header_bytenr(buf, cfg->blocks[6]);
546 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
547 btrfs_set_header_nritems(buf, 0);
548 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
549 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
550 if (ret != cfg->nodesize) {
551 ret = (ret < 0 ? -errno : -EIO);
555 /* and write out the super block */
556 BUG_ON(sizeof(super) > cfg->sectorsize);
557 memset(buf->data, 0, BTRFS_SUPER_INFO_SIZE);
558 memcpy(buf->data, &super, sizeof(super));
559 buf->len = BTRFS_SUPER_INFO_SIZE;
560 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
561 ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, cfg->blocks[0]);
562 if (ret != BTRFS_SUPER_INFO_SIZE) {
563 ret = (ret < 0 ? -errno : -EIO);
574 static const struct btrfs_fs_feature {
578 } mkfs_features[] = {
579 { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
580 "mixed data and metadata block groups" },
581 { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
582 "increased hardlink limit per file to 65536" },
583 { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
584 "raid56 extended format" },
585 { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
586 "reduced-size metadata extent refs" },
587 { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
588 "no explicit hole extents for files" },
589 /* Keep this one last */
590 { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
593 static int parse_one_fs_feature(const char *name, u64 *flags)
598 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
599 if (name[0] == '^' &&
600 !strcmp(mkfs_features[i].name, name + 1)) {
601 *flags &= ~ mkfs_features[i].flag;
603 } else if (!strcmp(mkfs_features[i].name, name)) {
604 *flags |= mkfs_features[i].flag;
612 void btrfs_parse_features_to_string(char *buf, u64 flags)
618 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
619 if (flags & mkfs_features[i].flag) {
622 strcat(buf, mkfs_features[i].name);
627 void btrfs_process_fs_features(u64 flags)
631 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
632 if (flags & mkfs_features[i].flag) {
633 printf("Turning ON incompat feature '%s': %s\n",
634 mkfs_features[i].name,
635 mkfs_features[i].desc);
640 void btrfs_list_all_fs_features(u64 mask_disallowed)
644 fprintf(stderr, "Filesystem features available:\n");
645 for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
646 char *is_default = "";
648 if (mkfs_features[i].flag & mask_disallowed)
650 if (mkfs_features[i].flag & BTRFS_MKFS_DEFAULT_FEATURES)
651 is_default = ", default";
652 fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
653 mkfs_features[i].name,
654 mkfs_features[i].desc,
655 mkfs_features[i].flag,
661 * Return NULL if all features were parsed fine, otherwise return the name of
662 * the first unparsed.
664 char* btrfs_parse_fs_features(char *namelist, u64 *flags)
667 char *save_ptr = NULL; /* Satisfy static checkers */
669 for (this_char = strtok_r(namelist, ",", &save_ptr);
671 this_char = strtok_r(NULL, ",", &save_ptr)) {
672 if (parse_one_fs_feature(this_char, flags))
679 u64 btrfs_device_size(int fd, struct stat *st)
682 if (S_ISREG(st->st_mode)) {
685 if (!S_ISBLK(st->st_mode)) {
688 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
694 static int zero_blocks(int fd, off_t start, size_t len)
696 char *buf = malloc(len);
703 written = pwrite(fd, buf, len, start);
710 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
712 /* don't write outside the device by clamping the region to the device size */
713 static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
715 off_t end = max(start, start + len);
718 /* and don't overwrite the disk labels on sparc */
719 start = max(start, 1024);
720 end = max(end, 1024);
723 start = min_t(u64, start, dev_size);
724 end = min_t(u64, end, dev_size);
726 return zero_blocks(fd, start, end - start);
729 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
730 struct btrfs_root *root, int fd, char *path,
731 u64 device_total_bytes, u32 io_width, u32 io_align,
734 struct btrfs_super_block *disk_super;
735 struct btrfs_super_block *super = root->fs_info->super_copy;
736 struct btrfs_device *device;
737 struct btrfs_dev_item *dev_item;
743 device_total_bytes = (device_total_bytes / sectorsize) * sectorsize;
745 device = kzalloc(sizeof(*device), GFP_NOFS);
748 buf = kzalloc(sectorsize, GFP_NOFS);
751 BUG_ON(sizeof(*disk_super) > sectorsize);
753 disk_super = (struct btrfs_super_block *)buf;
754 dev_item = &disk_super->dev_item;
756 uuid_generate(device->uuid);
759 device->io_width = io_width;
760 device->io_align = io_align;
761 device->sector_size = sectorsize;
763 device->writeable = 1;
764 device->total_bytes = device_total_bytes;
765 device->bytes_used = 0;
766 device->total_ios = 0;
767 device->dev_root = root->fs_info->dev_root;
768 device->name = strdup(path);
772 INIT_LIST_HEAD(&device->dev_list);
773 ret = btrfs_add_device(trans, root, device);
776 fs_total_bytes = btrfs_super_total_bytes(super) + device_total_bytes;
777 btrfs_set_super_total_bytes(super, fs_total_bytes);
779 num_devs = btrfs_super_num_devices(super) + 1;
780 btrfs_set_super_num_devices(super, num_devs);
782 memcpy(disk_super, super, sizeof(*disk_super));
784 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
785 btrfs_set_stack_device_id(dev_item, device->devid);
786 btrfs_set_stack_device_type(dev_item, device->type);
787 btrfs_set_stack_device_io_align(dev_item, device->io_align);
788 btrfs_set_stack_device_io_width(dev_item, device->io_width);
789 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
790 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
791 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
792 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
794 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
795 BUG_ON(ret != sectorsize);
798 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
799 device->fs_devices = root->fs_info->fs_devices;
808 static int btrfs_wipe_existing_sb(int fd)
810 const char *off = NULL;
815 blkid_probe pr = NULL;
817 pr = blkid_new_probe();
821 if (blkid_probe_set_device(pr, fd, 0, 0)) {
826 ret = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
828 ret = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
830 if (ret || len == 0 || off == NULL) {
832 * If lookup fails, the probe did not find any values, eg. for
833 * a file image or a loop device. Soft error.
839 offset = strtoll(off, NULL, 10);
840 if (len > sizeof(buf))
844 ret = pwrite(fd, buf, len, offset);
846 error("cannot wipe existing superblock: %s", strerror(errno));
848 } else if (ret != len) {
849 error("cannot wipe existing superblock: wrote %d of %zd", ret, len);
855 blkid_free_probe(pr);
859 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
860 u64 max_block_count, int discard)
866 ret = fstat(fd, &st);
868 error("unable to stat %s: %s", file, strerror(errno));
872 block_count = btrfs_device_size(fd, &st);
873 if (block_count == 0) {
874 error("unable to determine size of %s", file);
878 block_count = min(block_count, max_block_count);
882 * We intentionally ignore errors from the discard ioctl. It
883 * is not necessary for the mkfs functionality but just an
886 if (discard_range(fd, 0, 0) == 0) {
887 printf("Performing full device TRIM (%s) ...\n",
888 pretty_size(block_count));
889 discard_blocks(fd, 0, block_count);
893 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
894 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
895 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
896 BTRFS_SUPER_INFO_SIZE, block_count);
897 if (!ret && zero_end)
898 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
899 ZERO_DEV_BYTES, block_count);
902 error("failed to zero device '%s': %s", file, strerror(-ret));
906 ret = btrfs_wipe_existing_sb(fd);
908 error("cannot wipe superblocks on %s", file);
912 *block_count_ret = block_count;
916 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
917 struct btrfs_root *root, u64 objectid)
920 struct btrfs_inode_item inode_item;
921 time_t now = time(NULL);
923 memset(&inode_item, 0, sizeof(inode_item));
924 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
925 btrfs_set_stack_inode_size(&inode_item, 0);
926 btrfs_set_stack_inode_nlink(&inode_item, 1);
927 btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
928 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
929 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
930 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
931 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
932 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
933 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
934 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
935 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
936 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
938 if (root->fs_info->tree_root == root)
939 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
941 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
945 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
949 btrfs_set_root_dirid(&root->root_item, objectid);
956 * checks if a path is a block device node
957 * Returns negative errno on failure, otherwise
958 * returns 1 for blockdev, 0 for not-blockdev
960 int is_block_device(const char *path)
964 if (stat(path, &statbuf) < 0)
967 return !!S_ISBLK(statbuf.st_mode);
971 * check if given path is a mount point
972 * return 1 if yes. 0 if no. -1 for error
974 int is_mount_point(const char *path)
980 f = setmntent("/proc/self/mounts", "r");
984 while ((mnt = getmntent(f)) != NULL) {
985 if (strcmp(mnt->mnt_dir, path))
994 static int is_reg_file(const char *path)
998 if (stat(path, &statbuf) < 0)
1000 return S_ISREG(statbuf.st_mode);
1004 * This function checks if the given input parameter is
1006 * return <0 : some error in the given input
1007 * return BTRFS_ARG_UNKNOWN: unknown input
1008 * return BTRFS_ARG_UUID: given input is uuid
1009 * return BTRFS_ARG_MNTPOINT: given input is path
1010 * return BTRFS_ARG_REG: given input is regular file
1011 * return BTRFS_ARG_BLKDEV: given input is block device
1013 int check_arg_type(const char *input)
1016 char path[PATH_MAX];
1021 if (realpath(input, path)) {
1022 if (is_block_device(path) == 1)
1023 return BTRFS_ARG_BLKDEV;
1025 if (is_mount_point(path) == 1)
1026 return BTRFS_ARG_MNTPOINT;
1028 if (is_reg_file(path))
1029 return BTRFS_ARG_REG;
1031 return BTRFS_ARG_UNKNOWN;
1034 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
1035 !uuid_parse(input, uuid))
1036 return BTRFS_ARG_UUID;
1038 return BTRFS_ARG_UNKNOWN;
1042 * Find the mount point for a mounted device.
1043 * On success, returns 0 with mountpoint in *mp.
1044 * On failure, returns -errno (not mounted yields -EINVAL)
1045 * Is noisy on failures, expects to be given a mounted device.
1047 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
1052 ret = is_block_device(dev);
1055 error("not a block device: %s", dev);
1058 error("cannot check %s: %s", dev, strerror(-ret));
1063 fd = open(dev, O_RDONLY);
1066 error("cannot open %s: %s", dev, strerror(errno));
1070 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
1073 } else { /* mounted, all good */
1083 * Given a pathname, return a filehandle to:
1084 * the original pathname or,
1085 * if the pathname is a mounted btrfs device, to its mountpoint.
1087 * On error, return -1, errno should be set.
1089 int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
1094 if (is_block_device(path)) {
1095 ret = get_btrfs_mount(path, mp, sizeof(mp));
1097 /* not a mounted btrfs dev */
1098 error_on(verbose, "'%s' is not a mounted btrfs device",
1103 ret = open_file_or_dir(mp, dirstream);
1104 error_on(verbose && ret < 0, "can't access '%s': %s",
1105 path, strerror(errno));
1107 ret = btrfs_open_dir(path, dirstream, 1);
1114 * Do the following checks before calling open_file_or_dir():
1115 * 1: path is in a btrfs filesystem
1116 * 2: path is a directory
1118 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
1124 if (statfs(path, &stfs) != 0) {
1125 error_on(verbose, "cannot access '%s': %s", path,
1130 if (stfs.f_type != BTRFS_SUPER_MAGIC) {
1131 error_on(verbose, "not a btrfs filesystem: %s", path);
1135 if (stat(path, &st) != 0) {
1136 error_on(verbose, "cannot access '%s': %s", path,
1141 if (!S_ISDIR(st.st_mode)) {
1142 error_on(verbose, "not a directory: %s", path);
1146 ret = open_file_or_dir(path, dirstream);
1148 error_on(verbose, "cannot access '%s': %s", path,
1155 /* checks if a device is a loop device */
1156 static int is_loop_device (const char* device) {
1157 struct stat statbuf;
1159 if(stat(device, &statbuf) < 0)
1162 return (S_ISBLK(statbuf.st_mode) &&
1163 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
1167 * Takes a loop device path (e.g. /dev/loop0) and returns
1168 * the associated file (e.g. /images/my_btrfs.img) using
1171 static int resolve_loop_device_with_loopdev(const char* loop_dev, char* loop_file)
1175 struct loop_info64 lo64;
1177 fd = open(loop_dev, O_RDONLY | O_NONBLOCK);
1180 ret = ioctl(fd, LOOP_GET_STATUS64, &lo64);
1186 memcpy(loop_file, lo64.lo_file_name, sizeof(lo64.lo_file_name));
1187 loop_file[sizeof(lo64.lo_file_name)] = 0;
1195 /* Takes a loop device path (e.g. /dev/loop0) and returns
1196 * the associated file (e.g. /images/my_btrfs.img) */
1197 static int resolve_loop_device(const char* loop_dev, char* loop_file,
1204 char real_loop_dev[PATH_MAX];
1206 if (!realpath(loop_dev, real_loop_dev))
1208 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
1209 if (!(f = fopen(p, "r"))) {
1210 if (errno == ENOENT)
1212 * It's possibly a partitioned loop device, which is
1213 * resolvable with loopdev API.
1215 return resolve_loop_device_with_loopdev(loop_dev, loop_file);
1219 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
1220 ret = fscanf(f, fmt, loop_file);
1229 * Checks whether a and b are identical or device
1230 * files associated with the same block device
1232 static int is_same_blk_file(const char* a, const char* b)
1234 struct stat st_buf_a, st_buf_b;
1235 char real_a[PATH_MAX];
1236 char real_b[PATH_MAX];
1238 if (!realpath(a, real_a))
1239 strncpy_null(real_a, a);
1241 if (!realpath(b, real_b))
1242 strncpy_null(real_b, b);
1244 /* Identical path? */
1245 if (strcmp(real_a, real_b) == 0)
1248 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
1249 if (errno == ENOENT)
1254 /* Same blockdevice? */
1255 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
1256 st_buf_a.st_rdev == st_buf_b.st_rdev) {
1261 if (st_buf_a.st_dev == st_buf_b.st_dev &&
1262 st_buf_a.st_ino == st_buf_b.st_ino) {
1269 /* checks if a and b are identical or device
1270 * files associated with the same block device or
1271 * if one file is a loop device that uses the other
1274 static int is_same_loop_file(const char* a, const char* b)
1276 char res_a[PATH_MAX];
1277 char res_b[PATH_MAX];
1278 const char* final_a = NULL;
1279 const char* final_b = NULL;
1282 /* Resolve a if it is a loop device */
1283 if((ret = is_loop_device(a)) < 0) {
1288 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1299 /* Resolve b if it is a loop device */
1300 if ((ret = is_loop_device(b)) < 0) {
1305 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1316 return is_same_blk_file(final_a, final_b);
1319 /* Checks if a file exists and is a block or regular file*/
1320 static int is_existing_blk_or_reg_file(const char* filename)
1324 if(stat(filename, &st_buf) < 0) {
1331 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1334 /* Checks if a file is used (directly or indirectly via a loop device)
1335 * by a device in fs_devices
1337 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1341 struct list_head *head;
1342 struct list_head *cur;
1343 struct btrfs_device *device;
1345 head = &fs_devices->devices;
1346 list_for_each(cur, head) {
1347 device = list_entry(cur, struct btrfs_device, dev_list);
1349 if((ret = is_same_loop_file(device->name, file)))
1357 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1358 * Returns NULL on invalid input or malloc failure; Other failures
1359 * will be handled by the caller using the input pathame.
1361 char *canonicalize_dm_name(const char *ptname)
1365 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1367 if (!ptname || !*ptname)
1370 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1371 if (!(f = fopen(path, "r")))
1374 /* read <name>\n from sysfs */
1375 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1376 name[sz - 1] = '\0';
1377 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1379 if (access(path, F_OK) == 0)
1387 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1388 * to a device mapper pathname.
1389 * Returns NULL on invalid input or malloc failure; Other failures
1390 * will be handled by the caller using the input pathame.
1392 char *canonicalize_path(const char *path)
1394 char *canonical, *p;
1396 if (!path || !*path)
1399 canonical = realpath(path, NULL);
1401 return strdup(path);
1402 p = strrchr(canonical, '/');
1403 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1404 char *dm = canonicalize_dm_name(p + 1);
1415 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1416 * is safe to continue.
1418 int check_mounted(const char* file)
1423 fd = open(file, O_RDONLY);
1425 error("mount check: cannot open %s: %s", file,
1430 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1436 int check_mounted_where(int fd, const char *file, char *where, int size,
1437 struct btrfs_fs_devices **fs_dev_ret)
1442 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1446 /* scan the initial device */
1447 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1448 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1449 is_btrfs = (ret >= 0);
1451 /* scan other devices */
1452 if (is_btrfs && total_devs > 1) {
1453 ret = btrfs_scan_lblkid();
1458 /* iterate over the list of currently mountes filesystems */
1459 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1462 while ((mnt = getmntent (f)) != NULL) {
1464 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1467 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1469 /* ignore entries in the mount table that are not
1470 associated with a file*/
1471 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1472 goto out_mntloop_err;
1476 ret = is_same_loop_file(file, mnt->mnt_fsname);
1480 goto out_mntloop_err;
1485 /* Did we find an entry in mnt table? */
1486 if (mnt && size && where) {
1487 strncpy(where, mnt->mnt_dir, size);
1491 *fs_dev_ret = fs_devices_mnt;
1493 ret = (mnt != NULL);
1501 struct pending_dir {
1502 struct list_head list;
1503 char name[PATH_MAX];
1506 int btrfs_register_one_device(const char *fname)
1508 struct btrfs_ioctl_vol_args args;
1512 fd = open("/dev/btrfs-control", O_RDWR);
1515 "failed to open /dev/btrfs-control, skipping device registration: %s",
1519 memset(&args, 0, sizeof(args));
1520 strncpy_null(args.name, fname);
1521 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1523 error("device scan failed on '%s': %s", fname,
1532 * Register all devices in the fs_uuid list created in the user
1533 * space. Ensure btrfs_scan_lblkid() is called before this func.
1535 int btrfs_register_all_devices(void)
1539 struct btrfs_fs_devices *fs_devices;
1540 struct btrfs_device *device;
1541 struct list_head *all_uuids;
1543 all_uuids = btrfs_scanned_uuids();
1545 list_for_each_entry(fs_devices, all_uuids, list) {
1546 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1548 err = btrfs_register_one_device(device->name);
1558 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1561 struct btrfs_super_block *disk_super;
1565 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1570 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1571 if (ret != BTRFS_SUPER_INFO_SIZE)
1575 disk_super = (struct btrfs_super_block *)buf;
1576 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1579 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1589 * Note: this function uses a static per-thread buffer. Do not call this
1590 * function more than 10 times within one argument list!
1592 const char *pretty_size_mode(u64 size, unsigned mode)
1594 static __thread int ps_index = 0;
1595 static __thread char ps_array[10][32];
1598 ret = ps_array[ps_index];
1601 (void)pretty_size_snprintf(size, ret, 32, mode);
1606 static const char* unit_suffix_binary[] =
1607 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1608 static const char* unit_suffix_decimal[] =
1609 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1611 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1617 const char** suffix = NULL;
1623 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1624 snprintf(str, str_size, "%llu", size);
1628 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1631 suffix = unit_suffix_binary;
1632 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1635 suffix = unit_suffix_decimal;
1640 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1648 switch (unit_mode & UNITS_MODE_MASK) {
1649 case UNITS_TBYTES: base *= mult; num_divs++;
1650 case UNITS_GBYTES: base *= mult; num_divs++;
1651 case UNITS_MBYTES: base *= mult; num_divs++;
1652 case UNITS_KBYTES: num_divs++;
1659 while (size >= mult) {
1665 * If the value is smaller than base, we didn't do any
1666 * division, in that case, base should be 1, not original
1667 * base, or the unit will be wrong
1673 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1675 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1680 fraction = (float)last_size / base;
1682 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1686 * __strncpy__null - strncpy with null termination
1687 * @dest: the target array
1688 * @src: the source string
1689 * @n: maximum bytes to copy (size of *dest)
1691 * Like strncpy, but ensures destination is null-terminated.
1693 * Copies the string pointed to by src, including the terminating null
1694 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1695 * of n bytes. Then ensure that dest is null-terminated.
1697 char *__strncpy__null(char *dest, const char *src, size_t n)
1699 strncpy(dest, src, n);
1706 * Checks to make sure that the label matches our requirements.
1708 0 if everything is safe and usable
1709 -1 if the label is too long
1711 static int check_label(const char *input)
1713 int len = strlen(input);
1715 if (len > BTRFS_LABEL_SIZE - 1) {
1716 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1717 input, BTRFS_LABEL_SIZE - 1);
1724 static int set_label_unmounted(const char *dev, const char *label)
1726 struct btrfs_trans_handle *trans;
1727 struct btrfs_root *root;
1730 ret = check_mounted(dev);
1732 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1736 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1741 /* Open the super_block at the default location
1742 * and as read-write.
1744 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1745 if (!root) /* errors are printed by open_ctree() */
1748 trans = btrfs_start_transaction(root, 1);
1749 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1751 btrfs_commit_transaction(trans, root);
1753 /* Now we close it since we are done. */
1758 static int set_label_mounted(const char *mount_path, const char *labelp)
1761 char label[BTRFS_LABEL_SIZE];
1763 fd = open(mount_path, O_RDONLY | O_NOATIME);
1765 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1769 memset(label, 0, sizeof(label));
1770 strncpy(label, labelp, sizeof(label));
1771 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1772 fprintf(stderr, "ERROR: unable to set label %s\n",
1782 int get_label_unmounted(const char *dev, char *label)
1784 struct btrfs_root *root;
1787 ret = check_mounted(dev);
1789 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1793 /* Open the super_block at the default location
1796 root = open_ctree(dev, 0, 0);
1800 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1802 /* Now we close it since we are done. */
1808 * If a partition is mounted, try to get the filesystem label via its
1809 * mounted path rather than device. Return the corresponding error
1810 * the user specified the device path.
1812 int get_label_mounted(const char *mount_path, char *labelp)
1814 char label[BTRFS_LABEL_SIZE];
1818 fd = open(mount_path, O_RDONLY | O_NOATIME);
1820 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1824 memset(label, '\0', sizeof(label));
1825 ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
1827 if (errno != ENOTTY)
1828 fprintf(stderr, "ERROR: unable to get label %s\n",
1835 strncpy(labelp, label, sizeof(label));
1840 int get_label(const char *btrfs_dev, char *label)
1844 ret = is_existing_blk_or_reg_file(btrfs_dev);
1846 ret = get_label_mounted(btrfs_dev, label);
1848 ret = get_label_unmounted(btrfs_dev, label);
1853 int set_label(const char *btrfs_dev, const char *label)
1857 if (check_label(label))
1860 ret = is_existing_blk_or_reg_file(btrfs_dev);
1862 ret = set_label_mounted(btrfs_dev, label);
1864 ret = set_label_unmounted(btrfs_dev, label);
1870 * A not-so-good version fls64. No fascinating optimization since
1871 * no one except parse_size use it
1873 static int fls64(u64 x)
1877 for (i = 0; i <64; i++)
1878 if (x << i & (1ULL << 63))
1883 u64 parse_size(char *s)
1891 fprintf(stderr, "ERROR: Size value is empty\n");
1896 "ERROR: Size value '%s' is less equal than 0\n", s);
1899 ret = strtoull(s, &endptr, 10);
1901 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1904 if (endptr[0] && endptr[1]) {
1905 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1910 * strtoll returns LLONG_MAX when overflow, if this happens,
1911 * need to call strtoull to get the real size
1913 if (errno == ERANGE && ret == ULLONG_MAX) {
1915 "ERROR: Size value '%s' is too large for u64\n", s);
1919 c = tolower(endptr[0]);
1942 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1947 /* Check whether ret * mult overflow */
1948 if (fls64(ret) + fls64(mult) - 1 > 64) {
1950 "ERROR: Size value '%s' is too large for u64\n", s);
1957 u64 parse_qgroupid(const char *p)
1959 char *s = strchr(p, '/');
1960 const char *ptr_src_end = p + strlen(p);
1961 char *ptr_parse_end = NULL;
1970 /* Numeric format like '0/257' is the primary case */
1972 id = strtoull(p, &ptr_parse_end, 10);
1973 if (ptr_parse_end != ptr_src_end)
1977 level = strtoull(p, &ptr_parse_end, 10);
1978 if (ptr_parse_end != s)
1981 id = strtoull(s + 1, &ptr_parse_end, 10);
1982 if (ptr_parse_end != ptr_src_end)
1985 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
1988 /* Path format like subv at 'my_subvol' is the fallback case */
1989 ret = test_issubvolume(p);
1990 if (ret < 0 || !ret)
1992 fd = open(p, O_RDONLY);
1995 ret = lookup_ino_rootid(fd, &id);
2002 fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
2006 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
2012 ret = stat(fname, &st);
2016 if (S_ISDIR(st.st_mode)) {
2017 *dirstream = opendir(fname);
2020 fd = dirfd(*dirstream);
2021 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
2022 fd = open(fname, open_flags);
2025 * we set this on purpose, in case the caller output
2026 * strerror(errno) as success
2034 closedir(*dirstream);
2041 int open_file_or_dir(const char *fname, DIR **dirstream)
2043 return open_file_or_dir3(fname, dirstream, O_RDWR);
2046 void close_file_or_dir(int fd, DIR *dirstream)
2049 closedir(dirstream);
2054 int get_device_info(int fd, u64 devid,
2055 struct btrfs_ioctl_dev_info_args *di_args)
2059 di_args->devid = devid;
2060 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
2062 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
2063 return ret < 0 ? -errno : 0;
2066 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
2069 struct btrfs_dev_item *dev_item;
2070 char *buf = search_args->buf;
2072 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
2073 + sizeof(struct btrfs_dev_item));
2074 buf += sizeof(struct btrfs_ioctl_search_header);
2076 dev_item = (struct btrfs_dev_item *)buf;
2078 return btrfs_stack_device_id(dev_item);
2081 static int search_chunk_tree_for_fs_info(int fd,
2082 struct btrfs_ioctl_fs_info_args *fi_args)
2086 u64 start_devid = 1;
2087 struct btrfs_ioctl_search_args search_args;
2088 struct btrfs_ioctl_search_key *search_key = &search_args.key;
2090 fi_args->num_devices = 0;
2092 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
2093 / (sizeof(struct btrfs_ioctl_search_header)
2094 + sizeof(struct btrfs_dev_item));
2096 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
2097 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2098 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2099 search_key->min_type = BTRFS_DEV_ITEM_KEY;
2100 search_key->max_type = BTRFS_DEV_ITEM_KEY;
2101 search_key->min_transid = 0;
2102 search_key->max_transid = (u64)-1;
2103 search_key->nr_items = max_items;
2104 search_key->max_offset = (u64)-1;
2107 search_key->min_offset = start_devid;
2109 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
2113 fi_args->num_devices += (u64)search_key->nr_items;
2115 if (search_key->nr_items == max_items) {
2116 start_devid = find_max_device_id(&search_args,
2117 search_key->nr_items) + 1;
2121 /* get the lastest max_id to stay consistent with the num_devices */
2122 if (search_key->nr_items == 0)
2124 * last tree_search returns an empty buf, use the devid of
2125 * the last dev_item of the previous tree_search
2127 fi_args->max_id = start_devid - 1;
2129 fi_args->max_id = find_max_device_id(&search_args,
2130 search_key->nr_items);
2136 * For a given path, fill in the ioctl fs_ and info_ args.
2137 * If the path is a btrfs mountpoint, fill info for all devices.
2138 * If the path is a btrfs device, fill in only that device.
2140 * The path provided must be either on a mounted btrfs fs,
2141 * or be a mounted btrfs device.
2143 * Returns 0 on success, or a negative errno.
2145 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
2146 struct btrfs_ioctl_dev_info_args **di_ret)
2153 struct btrfs_fs_devices *fs_devices_mnt = NULL;
2154 struct btrfs_ioctl_dev_info_args *di_args;
2155 struct btrfs_ioctl_dev_info_args tmp;
2157 DIR *dirstream = NULL;
2159 memset(fi_args, 0, sizeof(*fi_args));
2161 if (is_block_device(path) == 1) {
2162 struct btrfs_super_block *disk_super;
2163 char buf[BTRFS_SUPER_INFO_SIZE];
2166 /* Ensure it's mounted, then set path to the mountpoint */
2167 fd = open(path, O_RDONLY);
2170 error("cannot open %s: %s", path, strerror(errno));
2173 ret = check_mounted_where(fd, path, mp, sizeof(mp),
2182 /* Only fill in this one device */
2183 fi_args->num_devices = 1;
2185 disk_super = (struct btrfs_super_block *)buf;
2186 ret = btrfs_read_dev_super(fd, disk_super,
2187 BTRFS_SUPER_INFO_OFFSET, 0);
2192 devid = btrfs_stack_device_id(&disk_super->dev_item);
2194 fi_args->max_id = devid;
2197 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
2201 /* at this point path must not be for a block device */
2202 fd = open_file_or_dir(path, &dirstream);
2208 /* fill in fi_args if not just a single device */
2209 if (fi_args->num_devices != 1) {
2210 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
2217 * The fs_args->num_devices does not include seed devices
2219 ret = search_chunk_tree_for_fs_info(fd, fi_args);
2224 * search_chunk_tree_for_fs_info() will lacks the devid 0
2225 * so manual probe for it here.
2227 ret = get_device_info(fd, 0, &tmp);
2229 fi_args->num_devices++;
2237 if (!fi_args->num_devices)
2240 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
2247 memcpy(di_args, &tmp, sizeof(tmp));
2248 for (; i <= fi_args->max_id; ++i) {
2249 ret = get_device_info(fd, i, &di_args[ndevs]);
2258 * only when the only dev we wanted to find is not there then
2259 * let any error be returned
2261 if (fi_args->num_devices != 1) {
2267 close_file_or_dir(fd, dirstream);
2271 #define isoctal(c) (((c) & ~7) == '0')
2273 static inline void translate(char *f, char *t)
2275 while (*f != '\0') {
2277 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
2278 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
2288 * Checks if the swap device.
2289 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2291 static int is_swap_device(const char *file)
2302 if (stat(file, &st_buf) < 0)
2304 if (S_ISBLK(st_buf.st_mode))
2305 dev = st_buf.st_rdev;
2306 else if (S_ISREG(st_buf.st_mode)) {
2307 dev = st_buf.st_dev;
2308 ino = st_buf.st_ino;
2312 if ((f = fopen("/proc/swaps", "r")) == NULL)
2315 /* skip the first line */
2316 if (fgets(tmp, sizeof(tmp), f) == NULL)
2319 while (fgets(tmp, sizeof(tmp), f) != NULL) {
2320 if ((cp = strchr(tmp, ' ')) != NULL)
2322 if ((cp = strchr(tmp, '\t')) != NULL)
2324 translate(tmp, buf);
2325 if (stat(buf, &st_buf) != 0)
2327 if (S_ISBLK(st_buf.st_mode)) {
2328 if (dev == st_buf.st_rdev) {
2332 } else if (S_ISREG(st_buf.st_mode)) {
2333 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
2347 * Check for existing filesystem or partition table on device.
2349 * 1 for existing fs or partition
2350 * 0 for nothing found
2351 * -1 for internal error
2358 blkid_probe pr = NULL;
2362 if (!device || !*device)
2365 ret = -1; /* will reset on success of all setup calls */
2367 pr = blkid_new_probe_from_filename(device);
2371 size = blkid_probe_get_size(pr);
2375 /* nothing to overwrite on a 0-length device */
2381 ret = blkid_probe_enable_partitions(pr, 1);
2385 ret = blkid_do_fullprobe(pr);
2390 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2391 * but we want the exact opposite, so reverse the return value here.
2393 * In addition print some useful diagnostics about what actually is
2401 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2403 "%s appears to contain an existing "
2404 "filesystem (%s).\n", device, type);
2405 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2407 "%s appears to contain a partition "
2408 "table (%s).\n", device, type);
2411 "%s appears to contain something weird "
2412 "according to blkid\n", device);
2418 blkid_free_probe(pr);
2421 "probe of %s failed, cannot detect "
2422 "existing filesystem.\n", device);
2426 static int group_profile_devs_min(u64 flag)
2428 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2429 case 0: /* single */
2430 case BTRFS_BLOCK_GROUP_DUP:
2432 case BTRFS_BLOCK_GROUP_RAID0:
2433 case BTRFS_BLOCK_GROUP_RAID1:
2434 case BTRFS_BLOCK_GROUP_RAID5:
2436 case BTRFS_BLOCK_GROUP_RAID6:
2438 case BTRFS_BLOCK_GROUP_RAID10:
2445 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2446 u64 dev_cnt, int mixed, int ssd)
2453 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2455 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2457 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2458 BTRFS_BLOCK_GROUP_RAID5;
2461 allowed |= BTRFS_BLOCK_GROUP_DUP;
2465 ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
2467 "ERROR: DUP is not allowed when FS has multiple devices\n");
2470 if (metadata_profile & ~allowed) {
2472 "ERROR: unable to create FS with metadata profile %s "
2473 "(have %llu devices but %d devices are required)\n",
2474 btrfs_group_profile_str(metadata_profile), dev_cnt,
2475 group_profile_devs_min(metadata_profile));
2478 if (data_profile & ~allowed) {
2480 "ERROR: unable to create FS with data profile %s "
2481 "(have %llu devices but %d devices are required)\n",
2482 btrfs_group_profile_str(data_profile), dev_cnt,
2483 group_profile_devs_min(data_profile));
2487 warning_on(!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP) && ssd,
2488 "DUP may not actually lead to 2 copies on the device, see manual page");
2493 int group_profile_max_safe_loss(u64 flags)
2495 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2496 case 0: /* single */
2497 case BTRFS_BLOCK_GROUP_DUP:
2498 case BTRFS_BLOCK_GROUP_RAID0:
2500 case BTRFS_BLOCK_GROUP_RAID1:
2501 case BTRFS_BLOCK_GROUP_RAID5:
2502 case BTRFS_BLOCK_GROUP_RAID10:
2504 case BTRFS_BLOCK_GROUP_RAID6:
2512 * Check if a device is suitable for btrfs
2514 * 1: something is wrong, an error is printed
2517 int test_dev_for_mkfs(char *file, int force_overwrite)
2522 ret = is_swap_device(file);
2524 fprintf(stderr, "ERROR: checking status of %s: %s\n", file,
2529 fprintf(stderr, "ERROR: %s is a swap device\n", file);
2532 if (!force_overwrite) {
2533 if (check_overwrite(file)) {
2534 fprintf(stderr, "Use the -f option to force overwrite.\n");
2538 ret = check_mounted(file);
2540 fprintf(stderr, "ERROR: checking mount status of %s: %s\n",
2541 file, strerror(-ret));
2545 fprintf(stderr, "ERROR: %s is mounted\n", file);
2548 /* check if the device is busy */
2549 fd = open(file, O_RDWR|O_EXCL);
2551 fprintf(stderr, "ERROR: unable to open %s: %s\n", file,
2555 if (fstat(fd, &st)) {
2556 fprintf(stderr, "ERROR: unable to stat %s: %s\n", file,
2561 if (!S_ISBLK(st.st_mode)) {
2562 fprintf(stderr, "ERROR: %s is not a block device\n", file);
2570 int btrfs_scan_lblkid(void)
2575 struct btrfs_fs_devices *tmp_devices;
2576 blkid_dev_iterate iter = NULL;
2577 blkid_dev dev = NULL;
2578 blkid_cache cache = NULL;
2579 char path[PATH_MAX];
2581 if (btrfs_scan_done)
2584 if (blkid_get_cache(&cache, NULL) < 0) {
2585 printf("ERROR: lblkid cache get failed\n");
2588 blkid_probe_all(cache);
2589 iter = blkid_dev_iterate_begin(cache);
2590 blkid_dev_set_search(iter, "TYPE", "btrfs");
2591 while (blkid_dev_next(iter, &dev) == 0) {
2592 dev = blkid_verify(cache, dev);
2595 /* if we are here its definitely a btrfs disk*/
2596 strncpy_null(path, blkid_dev_devname(dev));
2598 fd = open(path, O_RDONLY);
2600 printf("ERROR: could not open %s\n", path);
2603 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2604 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2606 printf("ERROR: could not scan %s\n", path);
2613 blkid_dev_iterate_end(iter);
2614 blkid_put_cache(cache);
2616 btrfs_scan_done = 1;
2621 int is_vol_small(char *file)
2628 fd = open(file, O_RDONLY);
2631 if (fstat(fd, &st) < 0) {
2636 size = btrfs_device_size(fd, &st);
2641 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2651 * This reads a line from the stdin and only returns non-zero if the
2652 * first whitespace delimited token is a case insensitive match with yes
2655 int ask_user(char *question)
2657 char buf[30] = {0,};
2658 char *saveptr = NULL;
2661 printf("%s [y/N]: ", question);
2663 return fgets(buf, sizeof(buf) - 1, stdin) &&
2664 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2665 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2670 * - file or directory return the containing tree root id
2671 * - subvolume return its own tree id
2672 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2673 * undefined and function returns -1
2675 int lookup_ino_rootid(int fd, u64 *rootid)
2677 struct btrfs_ioctl_ino_lookup_args args;
2680 memset(&args, 0, sizeof(args));
2682 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2684 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2686 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2691 *rootid = args.treeid;
2697 * return 0 if a btrfs mount point is found
2698 * return 1 if a mount point is found but not btrfs
2699 * return <0 if something goes wrong
2701 int find_mount_root(const char *path, char **mount_root)
2709 int longest_matchlen = 0;
2710 char *longest_match = NULL;
2712 fd = open(path, O_RDONLY | O_NOATIME);
2717 mnttab = setmntent("/proc/self/mounts", "r");
2721 while ((ent = getmntent(mnttab))) {
2722 len = strlen(ent->mnt_dir);
2723 if (strncmp(ent->mnt_dir, path, len) == 0) {
2724 /* match found and use the latest match */
2725 if (longest_matchlen <= len) {
2726 free(longest_match);
2727 longest_matchlen = len;
2728 longest_match = strdup(ent->mnt_dir);
2729 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2738 free(longest_match);
2743 *mount_root = realpath(longest_match, NULL);
2747 free(longest_match);
2751 int test_minimum_size(const char *file, u32 nodesize)
2754 struct stat statbuf;
2756 fd = open(file, O_RDONLY);
2759 if (stat(file, &statbuf) < 0) {
2763 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
2773 * Test if path is a directory
2775 * 0 - path exists but it is not a directory
2776 * 1 - path exists and it is a directory
2779 int test_isdir(const char *path)
2784 ret = stat(path, &st);
2788 return !!S_ISDIR(st.st_mode);
2791 void units_set_mode(unsigned *units, unsigned mode)
2793 unsigned base = *units & UNITS_MODE_MASK;
2795 *units = base | mode;
2798 void units_set_base(unsigned *units, unsigned base)
2800 unsigned mode = *units & ~UNITS_MODE_MASK;
2802 *units = base | mode;
2805 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2809 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2810 if (!path->nodes[level])
2812 if (path->slots[level] + 1 >=
2813 btrfs_header_nritems(path->nodes[level]))
2816 btrfs_item_key_to_cpu(path->nodes[level], key,
2817 path->slots[level] + 1);
2819 btrfs_node_key_to_cpu(path->nodes[level], key,
2820 path->slots[level] + 1);
2826 char* btrfs_group_type_str(u64 flag)
2828 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2829 BTRFS_SPACE_INFO_GLOBAL_RSV;
2831 switch (flag & mask) {
2832 case BTRFS_BLOCK_GROUP_DATA:
2834 case BTRFS_BLOCK_GROUP_SYSTEM:
2836 case BTRFS_BLOCK_GROUP_METADATA:
2838 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2839 return "Data+Metadata";
2840 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2841 return "GlobalReserve";
2847 char* btrfs_group_profile_str(u64 flag)
2849 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2852 case BTRFS_BLOCK_GROUP_RAID0:
2854 case BTRFS_BLOCK_GROUP_RAID1:
2856 case BTRFS_BLOCK_GROUP_RAID5:
2858 case BTRFS_BLOCK_GROUP_RAID6:
2860 case BTRFS_BLOCK_GROUP_DUP:
2862 case BTRFS_BLOCK_GROUP_RAID10:
2869 u64 disk_size(char *path)
2873 if (statfs(path, &sfs) < 0)
2876 return sfs.f_bsize * sfs.f_blocks;
2879 u64 get_partition_size(char *dev)
2882 int fd = open(dev, O_RDONLY);
2886 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2895 int btrfs_tree_search2_ioctl_supported(int fd)
2897 struct btrfs_ioctl_search_args_v2 *args2;
2898 struct btrfs_ioctl_search_key *sk;
2899 int args2_size = 1024;
2900 char args2_buf[args2_size];
2902 static int v2_supported = -1;
2904 if (v2_supported != -1)
2905 return v2_supported;
2907 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2911 * Search for the extent tree item in the root tree.
2913 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2914 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2915 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2916 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2917 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2919 sk->max_offset = (u64)-1;
2920 sk->min_transid = 0;
2921 sk->max_transid = (u64)-1;
2923 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2924 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2925 if (ret == -EOPNOTSUPP)
2932 return v2_supported;
2935 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
2937 if (nodesize < sectorsize) {
2939 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2940 nodesize, sectorsize);
2942 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2944 "ERROR: Illegal nodesize %u (larger than %u)\n",
2945 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2947 } else if (nodesize & (sectorsize - 1)) {
2949 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2950 nodesize, sectorsize);
2952 } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
2953 nodesize != sectorsize) {
2955 "ERROR: Illegal nodesize %u (not equal to %u for mixed block group)\n",
2956 nodesize, sectorsize);
2963 * Copy a path argument from SRC to DEST and check the SRC length if it's at
2964 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
2966 * The destination buffer is zero terminated.
2967 * Return < 0 for error, 0 otherwise.
2969 int arg_copy_path(char *dest, const char *src, int destlen)
2971 size_t len = strlen(src);
2973 if (len >= PATH_MAX || len >= destlen)
2974 return -ENAMETOOLONG;
2976 __strncpy__null(dest, src, destlen);
2981 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
2983 unsigned int unit_mode = UNITS_DEFAULT;
2987 for (arg_i = 0; arg_i < *argc; arg_i++) {
2988 if (!strcmp(argv[arg_i], "--"))
2991 if (!strcmp(argv[arg_i], "--raw")) {
2992 unit_mode = UNITS_RAW;
2996 if (!strcmp(argv[arg_i], "--human-readable")) {
2997 unit_mode = UNITS_HUMAN_BINARY;
3002 if (!strcmp(argv[arg_i], "--iec")) {
3003 units_set_mode(&unit_mode, UNITS_BINARY);
3007 if (!strcmp(argv[arg_i], "--si")) {
3008 units_set_mode(&unit_mode, UNITS_DECIMAL);
3013 if (!strcmp(argv[arg_i], "--kbytes")) {
3014 units_set_base(&unit_mode, UNITS_KBYTES);
3018 if (!strcmp(argv[arg_i], "--mbytes")) {
3019 units_set_base(&unit_mode, UNITS_MBYTES);
3023 if (!strcmp(argv[arg_i], "--gbytes")) {
3024 units_set_base(&unit_mode, UNITS_GBYTES);
3028 if (!strcmp(argv[arg_i], "--tbytes")) {
3029 units_set_base(&unit_mode, UNITS_TBYTES);
3037 if (!strcmp(argv[arg_i], "-b")) {
3038 unit_mode = UNITS_RAW;
3042 if (!strcmp(argv[arg_i], "-h")) {
3043 unit_mode = UNITS_HUMAN_BINARY;
3047 if (!strcmp(argv[arg_i], "-H")) {
3048 unit_mode = UNITS_HUMAN_DECIMAL;
3052 if (!strcmp(argv[arg_i], "-k")) {
3053 units_set_base(&unit_mode, UNITS_KBYTES);
3057 if (!strcmp(argv[arg_i], "-m")) {
3058 units_set_base(&unit_mode, UNITS_MBYTES);
3062 if (!strcmp(argv[arg_i], "-g")) {
3063 units_set_base(&unit_mode, UNITS_GBYTES);
3067 if (!strcmp(argv[arg_i], "-t")) {
3068 units_set_base(&unit_mode, UNITS_TBYTES);
3074 for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
3077 argv[arg_end] = argv[arg_i];
3086 int string_is_numerical(const char *str)
3088 if (!(*str >= '0' && *str <= '9'))
3090 while (*str >= '0' && *str <= '9')
3098 * Preprocess @argv with getopt_long to reorder options and consume the "--"
3100 * Unknown short and long options are reported, optionally the @usage is printed
3103 void clean_args_no_options(int argc, char *argv[], const char * const *usagestr)
3105 static const struct option long_options[] = {
3110 int c = getopt_long(argc, argv, "", long_options, NULL);
3123 /* Subvolume helper functions */
3125 * test if name is a correct subvolume name
3126 * this function return
3127 * 0-> name is not a correct subvolume name
3128 * 1-> name is a correct subvolume name
3130 int test_issubvolname(const char *name)
3132 return name[0] != '\0' && !strchr(name, '/') &&
3133 strcmp(name, ".") && strcmp(name, "..");
3137 * Test if path is a subvolume
3139 * 0 - path exists but it is not a subvolume
3140 * 1 - path exists and it is a subvolume
3143 int test_issubvolume(const char *path)
3149 res = stat(path, &st);
3153 if (st.st_ino != BTRFS_FIRST_FREE_OBJECTID || !S_ISDIR(st.st_mode))
3156 res = statfs(path, &stfs);
3160 return (int)stfs.f_type == BTRFS_SUPER_MAGIC;
3163 char *get_subvol_name(char *mnt, char *full_path)
3165 int len = strlen(mnt);
3169 if (mnt[len - 1] != '/')
3172 return full_path + len;
3179 * 1: Error; and error info printed to the terminal. Fixme.
3180 * 2: If the fullpath is root tree instead of subvol tree
3182 int get_subvol_info(char *fullpath, struct root_info *get_ri)
3189 char *svpath = NULL;
3190 DIR *dirstream1 = NULL;
3191 DIR *dirstream2 = NULL;
3193 ret = test_issubvolume(fullpath);
3197 error("not a subvolume: %s", fullpath);
3201 ret = find_mount_root(fullpath, &mnt);
3205 error("%s doesn't belong to btrfs mount point", fullpath);
3209 svpath = get_subvol_name(mnt, fullpath);
3211 fd = btrfs_open_dir(fullpath, &dirstream1, 1);
3215 ret = btrfs_list_get_path_rootid(fd, &sv_id);
3217 error("can't get rootid for '%s'", fullpath);
3221 mntfd = btrfs_open_dir(mnt, &dirstream2, 1);
3225 if (sv_id == BTRFS_FS_TREE_OBJECTID) {
3228 * So that caller may decide if thats an error or just fine.
3233 memset(get_ri, 0, sizeof(*get_ri));
3234 get_ri->root_id = sv_id;
3236 ret = btrfs_get_subvol(mntfd, get_ri);
3238 error("can't find '%s': %d", svpath, ret);
3241 close_file_or_dir(mntfd, dirstream2);
3242 close_file_or_dir(mntfd, dirstream1);