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 fprintf(stderr, "ERROR: cannot wipe existing superblock\n");
852 blkid_free_probe(pr);
856 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
857 u64 max_block_count, int discard)
863 ret = fstat(fd, &st);
865 fprintf(stderr, "unable to stat %s\n", file);
869 block_count = btrfs_device_size(fd, &st);
870 if (block_count == 0) {
871 fprintf(stderr, "unable to find %s size\n", file);
875 block_count = min(block_count, max_block_count);
879 * We intentionally ignore errors from the discard ioctl. It
880 * is not necessary for the mkfs functionality but just an
883 if (discard_range(fd, 0, 0) == 0) {
884 printf("Performing full device TRIM (%s) ...\n",
885 pretty_size(block_count));
886 discard_blocks(fd, 0, block_count);
890 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
891 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
892 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
893 BTRFS_SUPER_INFO_SIZE, block_count);
894 if (!ret && zero_end)
895 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
896 ZERO_DEV_BYTES, block_count);
899 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
900 file, strerror(-ret));
904 ret = btrfs_wipe_existing_sb(fd);
906 fprintf(stderr, "ERROR: cannot wipe superblocks on '%s'\n",
911 *block_count_ret = block_count;
915 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
916 struct btrfs_root *root, u64 objectid)
919 struct btrfs_inode_item inode_item;
920 time_t now = time(NULL);
922 memset(&inode_item, 0, sizeof(inode_item));
923 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
924 btrfs_set_stack_inode_size(&inode_item, 0);
925 btrfs_set_stack_inode_nlink(&inode_item, 1);
926 btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
927 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
928 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
929 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
930 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
931 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
932 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
933 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
934 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
935 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
937 if (root->fs_info->tree_root == root)
938 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
940 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
944 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
948 btrfs_set_root_dirid(&root->root_item, objectid);
955 * checks if a path is a block device node
956 * Returns negative errno on failure, otherwise
957 * returns 1 for blockdev, 0 for not-blockdev
959 int is_block_device(const char *path)
963 if (stat(path, &statbuf) < 0)
966 return !!S_ISBLK(statbuf.st_mode);
970 * check if given path is a mount point
971 * return 1 if yes. 0 if no. -1 for error
973 int is_mount_point(const char *path)
979 f = setmntent("/proc/self/mounts", "r");
983 while ((mnt = getmntent(f)) != NULL) {
984 if (strcmp(mnt->mnt_dir, path))
993 static int is_reg_file(const char *path)
997 if (stat(path, &statbuf) < 0)
999 return S_ISREG(statbuf.st_mode);
1003 * This function checks if the given input parameter is
1005 * return <0 : some error in the given input
1006 * return BTRFS_ARG_UNKNOWN: unknown input
1007 * return BTRFS_ARG_UUID: given input is uuid
1008 * return BTRFS_ARG_MNTPOINT: given input is path
1009 * return BTRFS_ARG_REG: given input is regular file
1010 * return BTRFS_ARG_BLKDEV: given input is block device
1012 int check_arg_type(const char *input)
1015 char path[PATH_MAX];
1020 if (realpath(input, path)) {
1021 if (is_block_device(path) == 1)
1022 return BTRFS_ARG_BLKDEV;
1024 if (is_mount_point(path) == 1)
1025 return BTRFS_ARG_MNTPOINT;
1027 if (is_reg_file(path))
1028 return BTRFS_ARG_REG;
1030 return BTRFS_ARG_UNKNOWN;
1033 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
1034 !uuid_parse(input, uuid))
1035 return BTRFS_ARG_UUID;
1037 return BTRFS_ARG_UNKNOWN;
1041 * Find the mount point for a mounted device.
1042 * On success, returns 0 with mountpoint in *mp.
1043 * On failure, returns -errno (not mounted yields -EINVAL)
1044 * Is noisy on failures, expects to be given a mounted device.
1046 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
1051 ret = is_block_device(dev);
1054 fprintf(stderr, "%s is not a block device\n", dev);
1057 fprintf(stderr, "Could not check %s: %s\n",
1058 dev, strerror(-ret));
1063 fd = open(dev, O_RDONLY);
1066 fprintf(stderr, "Could not open %s: %s\n", 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) {
1127 "ERROR: can't access '%s': %s\n",
1128 path, strerror(errno));
1132 if (stfs.f_type != BTRFS_SUPER_MAGIC) {
1135 "ERROR: not a btrfs filesystem: %s\n",
1140 if (stat(path, &st) != 0) {
1143 "ERROR: can't access '%s': %s\n",
1144 path, strerror(errno));
1148 if (!S_ISDIR(st.st_mode)) {
1151 "ERROR: not a directory: %s\n",
1156 ret = open_file_or_dir(path, dirstream);
1160 "ERROR: can't access '%s': %s\n",
1161 path, strerror(errno));
1167 /* checks if a device is a loop device */
1168 static int is_loop_device (const char* device) {
1169 struct stat statbuf;
1171 if(stat(device, &statbuf) < 0)
1174 return (S_ISBLK(statbuf.st_mode) &&
1175 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
1179 * Takes a loop device path (e.g. /dev/loop0) and returns
1180 * the associated file (e.g. /images/my_btrfs.img) using
1183 static int resolve_loop_device_with_loopdev(const char* loop_dev, char* loop_file)
1187 struct loop_info64 lo64;
1189 fd = open(loop_dev, O_RDONLY | O_NONBLOCK);
1192 ret = ioctl(fd, LOOP_GET_STATUS64, &lo64);
1198 memcpy(loop_file, lo64.lo_file_name, sizeof(lo64.lo_file_name));
1199 loop_file[sizeof(lo64.lo_file_name)] = 0;
1207 /* Takes a loop device path (e.g. /dev/loop0) and returns
1208 * the associated file (e.g. /images/my_btrfs.img) */
1209 static int resolve_loop_device(const char* loop_dev, char* loop_file,
1216 char real_loop_dev[PATH_MAX];
1218 if (!realpath(loop_dev, real_loop_dev))
1220 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
1221 if (!(f = fopen(p, "r"))) {
1222 if (errno == ENOENT)
1224 * It's possibly a partitioned loop device, which is
1225 * resolvable with loopdev API.
1227 return resolve_loop_device_with_loopdev(loop_dev, loop_file);
1231 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
1232 ret = fscanf(f, fmt, loop_file);
1241 * Checks whether a and b are identical or device
1242 * files associated with the same block device
1244 static int is_same_blk_file(const char* a, const char* b)
1246 struct stat st_buf_a, st_buf_b;
1247 char real_a[PATH_MAX];
1248 char real_b[PATH_MAX];
1250 if (!realpath(a, real_a))
1251 strncpy_null(real_a, a);
1253 if (!realpath(b, real_b))
1254 strncpy_null(real_b, b);
1256 /* Identical path? */
1257 if (strcmp(real_a, real_b) == 0)
1260 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
1261 if (errno == ENOENT)
1266 /* Same blockdevice? */
1267 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
1268 st_buf_a.st_rdev == st_buf_b.st_rdev) {
1273 if (st_buf_a.st_dev == st_buf_b.st_dev &&
1274 st_buf_a.st_ino == st_buf_b.st_ino) {
1281 /* checks if a and b are identical or device
1282 * files associated with the same block device or
1283 * if one file is a loop device that uses the other
1286 static int is_same_loop_file(const char* a, const char* b)
1288 char res_a[PATH_MAX];
1289 char res_b[PATH_MAX];
1290 const char* final_a = NULL;
1291 const char* final_b = NULL;
1294 /* Resolve a if it is a loop device */
1295 if((ret = is_loop_device(a)) < 0) {
1300 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1311 /* Resolve b if it is a loop device */
1312 if ((ret = is_loop_device(b)) < 0) {
1317 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1328 return is_same_blk_file(final_a, final_b);
1331 /* Checks if a file exists and is a block or regular file*/
1332 static int is_existing_blk_or_reg_file(const char* filename)
1336 if(stat(filename, &st_buf) < 0) {
1343 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1346 /* Checks if a file is used (directly or indirectly via a loop device)
1347 * by a device in fs_devices
1349 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1353 struct list_head *head;
1354 struct list_head *cur;
1355 struct btrfs_device *device;
1357 head = &fs_devices->devices;
1358 list_for_each(cur, head) {
1359 device = list_entry(cur, struct btrfs_device, dev_list);
1361 if((ret = is_same_loop_file(device->name, file)))
1369 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1370 * Returns NULL on invalid input or malloc failure; Other failures
1371 * will be handled by the caller using the input pathame.
1373 char *canonicalize_dm_name(const char *ptname)
1377 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1379 if (!ptname || !*ptname)
1382 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1383 if (!(f = fopen(path, "r")))
1386 /* read <name>\n from sysfs */
1387 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1388 name[sz - 1] = '\0';
1389 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1391 if (access(path, F_OK) == 0)
1399 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1400 * to a device mapper pathname.
1401 * Returns NULL on invalid input or malloc failure; Other failures
1402 * will be handled by the caller using the input pathame.
1404 char *canonicalize_path(const char *path)
1406 char *canonical, *p;
1408 if (!path || !*path)
1411 canonical = realpath(path, NULL);
1413 return strdup(path);
1414 p = strrchr(canonical, '/');
1415 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1416 char *dm = canonicalize_dm_name(p + 1);
1427 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1428 * is safe to continue.
1430 int check_mounted(const char* file)
1435 fd = open(file, O_RDONLY);
1437 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1441 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1447 int check_mounted_where(int fd, const char *file, char *where, int size,
1448 struct btrfs_fs_devices **fs_dev_ret)
1453 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1457 /* scan the initial device */
1458 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1459 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1460 is_btrfs = (ret >= 0);
1462 /* scan other devices */
1463 if (is_btrfs && total_devs > 1) {
1464 ret = btrfs_scan_lblkid();
1469 /* iterate over the list of currently mountes filesystems */
1470 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1473 while ((mnt = getmntent (f)) != NULL) {
1475 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1478 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1480 /* ignore entries in the mount table that are not
1481 associated with a file*/
1482 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1483 goto out_mntloop_err;
1487 ret = is_same_loop_file(file, mnt->mnt_fsname);
1491 goto out_mntloop_err;
1496 /* Did we find an entry in mnt table? */
1497 if (mnt && size && where) {
1498 strncpy(where, mnt->mnt_dir, size);
1502 *fs_dev_ret = fs_devices_mnt;
1504 ret = (mnt != NULL);
1512 struct pending_dir {
1513 struct list_head list;
1514 char name[PATH_MAX];
1517 int btrfs_register_one_device(const char *fname)
1519 struct btrfs_ioctl_vol_args args;
1523 fd = open("/dev/btrfs-control", O_RDWR);
1525 fprintf(stderr, "failed to open /dev/btrfs-control "
1526 "skipping device registration: %s\n",
1530 memset(&args, 0, sizeof(args));
1531 strncpy_null(args.name, fname);
1532 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1534 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1535 fname, strerror(errno));
1543 * Register all devices in the fs_uuid list created in the user
1544 * space. Ensure btrfs_scan_lblkid() is called before this func.
1546 int btrfs_register_all_devices(void)
1549 struct btrfs_fs_devices *fs_devices;
1550 struct btrfs_device *device;
1551 struct list_head *all_uuids;
1553 all_uuids = btrfs_scanned_uuids();
1555 list_for_each_entry(fs_devices, all_uuids, list) {
1556 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1557 if (*device->name) {
1558 err = btrfs_register_one_device(device->name);
1569 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1572 struct btrfs_super_block *disk_super;
1576 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1581 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1582 if (ret != BTRFS_SUPER_INFO_SIZE)
1586 disk_super = (struct btrfs_super_block *)buf;
1587 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1590 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1600 * Note: this function uses a static per-thread buffer. Do not call this
1601 * function more than 10 times within one argument list!
1603 const char *pretty_size_mode(u64 size, unsigned mode)
1605 static __thread int ps_index = 0;
1606 static __thread char ps_array[10][32];
1609 ret = ps_array[ps_index];
1612 (void)pretty_size_snprintf(size, ret, 32, mode);
1617 static const char* unit_suffix_binary[] =
1618 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1619 static const char* unit_suffix_decimal[] =
1620 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1622 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1628 const char** suffix = NULL;
1634 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1635 snprintf(str, str_size, "%llu", size);
1639 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1642 suffix = unit_suffix_binary;
1643 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1646 suffix = unit_suffix_decimal;
1651 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1659 switch (unit_mode & UNITS_MODE_MASK) {
1660 case UNITS_TBYTES: base *= mult; num_divs++;
1661 case UNITS_GBYTES: base *= mult; num_divs++;
1662 case UNITS_MBYTES: base *= mult; num_divs++;
1663 case UNITS_KBYTES: num_divs++;
1670 while (size >= mult) {
1676 * If the value is smaller than base, we didn't do any
1677 * division, in that case, base should be 1, not original
1678 * base, or the unit will be wrong
1684 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1686 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1691 fraction = (float)last_size / base;
1693 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1697 * __strncpy__null - strncpy with null termination
1698 * @dest: the target array
1699 * @src: the source string
1700 * @n: maximum bytes to copy (size of *dest)
1702 * Like strncpy, but ensures destination is null-terminated.
1704 * Copies the string pointed to by src, including the terminating null
1705 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1706 * of n bytes. Then ensure that dest is null-terminated.
1708 char *__strncpy__null(char *dest, const char *src, size_t n)
1710 strncpy(dest, src, n);
1717 * Checks to make sure that the label matches our requirements.
1719 0 if everything is safe and usable
1720 -1 if the label is too long
1722 static int check_label(const char *input)
1724 int len = strlen(input);
1726 if (len > BTRFS_LABEL_SIZE - 1) {
1727 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1728 input, BTRFS_LABEL_SIZE - 1);
1735 static int set_label_unmounted(const char *dev, const char *label)
1737 struct btrfs_trans_handle *trans;
1738 struct btrfs_root *root;
1741 ret = check_mounted(dev);
1743 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1747 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1752 /* Open the super_block at the default location
1753 * and as read-write.
1755 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1756 if (!root) /* errors are printed by open_ctree() */
1759 trans = btrfs_start_transaction(root, 1);
1760 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1762 btrfs_commit_transaction(trans, root);
1764 /* Now we close it since we are done. */
1769 static int set_label_mounted(const char *mount_path, const char *label)
1773 fd = open(mount_path, O_RDONLY | O_NOATIME);
1775 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1779 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1780 fprintf(stderr, "ERROR: unable to set label %s\n",
1790 int get_label_unmounted(const char *dev, char *label)
1792 struct btrfs_root *root;
1795 ret = check_mounted(dev);
1797 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1801 /* Open the super_block at the default location
1804 root = open_ctree(dev, 0, 0);
1808 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1810 /* Now we close it since we are done. */
1816 * If a partition is mounted, try to get the filesystem label via its
1817 * mounted path rather than device. Return the corresponding error
1818 * the user specified the device path.
1820 int get_label_mounted(const char *mount_path, char *labelp)
1822 char label[BTRFS_LABEL_SIZE];
1826 fd = open(mount_path, O_RDONLY | O_NOATIME);
1828 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1832 memset(label, '\0', sizeof(label));
1833 ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
1835 if (errno != ENOTTY)
1836 fprintf(stderr, "ERROR: unable to get label %s\n",
1843 strncpy(labelp, label, sizeof(label));
1848 int get_label(const char *btrfs_dev, char *label)
1852 ret = is_existing_blk_or_reg_file(btrfs_dev);
1854 ret = get_label_mounted(btrfs_dev, label);
1856 ret = get_label_unmounted(btrfs_dev, label);
1861 int set_label(const char *btrfs_dev, const char *label)
1865 if (check_label(label))
1868 ret = is_existing_blk_or_reg_file(btrfs_dev);
1870 ret = set_label_mounted(btrfs_dev, label);
1872 ret = set_label_unmounted(btrfs_dev, label);
1878 * Unsafe subvolume check.
1880 * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
1881 * btrfs mount point.
1882 * Must use together with other reliable method like btrfs ioctl.
1884 static int __is_subvol(const char *path)
1889 ret = lstat(path, &st);
1893 return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
1897 * A not-so-good version fls64. No fascinating optimization since
1898 * no one except parse_size use it
1900 static int fls64(u64 x)
1904 for (i = 0; i <64; i++)
1905 if (x << i & (1ULL << 63))
1910 u64 parse_size(char *s)
1918 fprintf(stderr, "ERROR: Size value is empty\n");
1923 "ERROR: Size value '%s' is less equal than 0\n", s);
1926 ret = strtoull(s, &endptr, 10);
1928 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1931 if (endptr[0] && endptr[1]) {
1932 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1937 * strtoll returns LLONG_MAX when overflow, if this happens,
1938 * need to call strtoull to get the real size
1940 if (errno == ERANGE && ret == ULLONG_MAX) {
1942 "ERROR: Size value '%s' is too large for u64\n", s);
1946 c = tolower(endptr[0]);
1969 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1974 /* Check whether ret * mult overflow */
1975 if (fls64(ret) + fls64(mult) - 1 > 64) {
1977 "ERROR: Size value '%s' is too large for u64\n", s);
1984 u64 parse_qgroupid(const char *p)
1986 char *s = strchr(p, '/');
1987 const char *ptr_src_end = p + strlen(p);
1988 char *ptr_parse_end = NULL;
1997 /* Numeric format like '0/257' is the primary case */
1999 id = strtoull(p, &ptr_parse_end, 10);
2000 if (ptr_parse_end != ptr_src_end)
2004 level = strtoull(p, &ptr_parse_end, 10);
2005 if (ptr_parse_end != s)
2008 id = strtoull(s + 1, &ptr_parse_end, 10);
2009 if (ptr_parse_end != ptr_src_end)
2012 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
2015 /* Path format like subv at 'my_subvol' is the fallback case */
2016 ret = __is_subvol(p);
2017 if (ret < 0 || !ret)
2019 fd = open(p, O_RDONLY);
2022 ret = lookup_ino_rootid(fd, &id);
2029 fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
2033 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
2039 ret = stat(fname, &st);
2043 if (S_ISDIR(st.st_mode)) {
2044 *dirstream = opendir(fname);
2047 fd = dirfd(*dirstream);
2048 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
2049 fd = open(fname, open_flags);
2052 * we set this on purpose, in case the caller output
2053 * strerror(errno) as success
2061 closedir(*dirstream);
2068 int open_file_or_dir(const char *fname, DIR **dirstream)
2070 return open_file_or_dir3(fname, dirstream, O_RDWR);
2073 void close_file_or_dir(int fd, DIR *dirstream)
2076 closedir(dirstream);
2081 int get_device_info(int fd, u64 devid,
2082 struct btrfs_ioctl_dev_info_args *di_args)
2086 di_args->devid = devid;
2087 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
2089 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
2090 return ret < 0 ? -errno : 0;
2093 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
2096 struct btrfs_dev_item *dev_item;
2097 char *buf = search_args->buf;
2099 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
2100 + sizeof(struct btrfs_dev_item));
2101 buf += sizeof(struct btrfs_ioctl_search_header);
2103 dev_item = (struct btrfs_dev_item *)buf;
2105 return btrfs_stack_device_id(dev_item);
2108 static int search_chunk_tree_for_fs_info(int fd,
2109 struct btrfs_ioctl_fs_info_args *fi_args)
2113 u64 start_devid = 1;
2114 struct btrfs_ioctl_search_args search_args;
2115 struct btrfs_ioctl_search_key *search_key = &search_args.key;
2117 fi_args->num_devices = 0;
2119 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
2120 / (sizeof(struct btrfs_ioctl_search_header)
2121 + sizeof(struct btrfs_dev_item));
2123 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
2124 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2125 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2126 search_key->min_type = BTRFS_DEV_ITEM_KEY;
2127 search_key->max_type = BTRFS_DEV_ITEM_KEY;
2128 search_key->min_transid = 0;
2129 search_key->max_transid = (u64)-1;
2130 search_key->nr_items = max_items;
2131 search_key->max_offset = (u64)-1;
2134 search_key->min_offset = start_devid;
2136 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
2140 fi_args->num_devices += (u64)search_key->nr_items;
2142 if (search_key->nr_items == max_items) {
2143 start_devid = find_max_device_id(&search_args,
2144 search_key->nr_items) + 1;
2148 /* get the lastest max_id to stay consistent with the num_devices */
2149 if (search_key->nr_items == 0)
2151 * last tree_search returns an empty buf, use the devid of
2152 * the last dev_item of the previous tree_search
2154 fi_args->max_id = start_devid - 1;
2156 fi_args->max_id = find_max_device_id(&search_args,
2157 search_key->nr_items);
2163 * For a given path, fill in the ioctl fs_ and info_ args.
2164 * If the path is a btrfs mountpoint, fill info for all devices.
2165 * If the path is a btrfs device, fill in only that device.
2167 * The path provided must be either on a mounted btrfs fs,
2168 * or be a mounted btrfs device.
2170 * Returns 0 on success, or a negative errno.
2172 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
2173 struct btrfs_ioctl_dev_info_args **di_ret)
2180 struct btrfs_fs_devices *fs_devices_mnt = NULL;
2181 struct btrfs_ioctl_dev_info_args *di_args;
2182 struct btrfs_ioctl_dev_info_args tmp;
2184 DIR *dirstream = NULL;
2186 memset(fi_args, 0, sizeof(*fi_args));
2188 if (is_block_device(path) == 1) {
2189 struct btrfs_super_block *disk_super;
2190 char buf[BTRFS_SUPER_INFO_SIZE];
2193 /* Ensure it's mounted, then set path to the mountpoint */
2194 fd = open(path, O_RDONLY);
2197 fprintf(stderr, "Couldn't open %s: %s\n",
2198 path, strerror(errno));
2201 ret = check_mounted_where(fd, path, mp, sizeof(mp),
2210 /* Only fill in this one device */
2211 fi_args->num_devices = 1;
2213 disk_super = (struct btrfs_super_block *)buf;
2214 ret = btrfs_read_dev_super(fd, disk_super,
2215 BTRFS_SUPER_INFO_OFFSET, 0);
2220 devid = btrfs_stack_device_id(&disk_super->dev_item);
2222 fi_args->max_id = devid;
2225 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
2229 /* at this point path must not be for a block device */
2230 fd = open_file_or_dir(path, &dirstream);
2236 /* fill in fi_args if not just a single device */
2237 if (fi_args->num_devices != 1) {
2238 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
2245 * The fs_args->num_devices does not include seed devices
2247 ret = search_chunk_tree_for_fs_info(fd, fi_args);
2252 * search_chunk_tree_for_fs_info() will lacks the devid 0
2253 * so manual probe for it here.
2255 ret = get_device_info(fd, 0, &tmp);
2257 fi_args->num_devices++;
2265 if (!fi_args->num_devices)
2268 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
2275 memcpy(di_args, &tmp, sizeof(tmp));
2276 for (; i <= fi_args->max_id; ++i) {
2277 ret = get_device_info(fd, i, &di_args[ndevs]);
2286 * only when the only dev we wanted to find is not there then
2287 * let any error be returned
2289 if (fi_args->num_devices != 1) {
2295 close_file_or_dir(fd, dirstream);
2299 #define isoctal(c) (((c) & ~7) == '0')
2301 static inline void translate(char *f, char *t)
2303 while (*f != '\0') {
2305 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
2306 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
2316 * Checks if the swap device.
2317 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2319 static int is_swap_device(const char *file)
2330 if (stat(file, &st_buf) < 0)
2332 if (S_ISBLK(st_buf.st_mode))
2333 dev = st_buf.st_rdev;
2334 else if (S_ISREG(st_buf.st_mode)) {
2335 dev = st_buf.st_dev;
2336 ino = st_buf.st_ino;
2340 if ((f = fopen("/proc/swaps", "r")) == NULL)
2343 /* skip the first line */
2344 if (fgets(tmp, sizeof(tmp), f) == NULL)
2347 while (fgets(tmp, sizeof(tmp), f) != NULL) {
2348 if ((cp = strchr(tmp, ' ')) != NULL)
2350 if ((cp = strchr(tmp, '\t')) != NULL)
2352 translate(tmp, buf);
2353 if (stat(buf, &st_buf) != 0)
2355 if (S_ISBLK(st_buf.st_mode)) {
2356 if (dev == st_buf.st_rdev) {
2360 } else if (S_ISREG(st_buf.st_mode)) {
2361 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
2375 * Check for existing filesystem or partition table on device.
2377 * 1 for existing fs or partition
2378 * 0 for nothing found
2379 * -1 for internal error
2386 blkid_probe pr = NULL;
2390 if (!device || !*device)
2393 ret = -1; /* will reset on success of all setup calls */
2395 pr = blkid_new_probe_from_filename(device);
2399 size = blkid_probe_get_size(pr);
2403 /* nothing to overwrite on a 0-length device */
2409 ret = blkid_probe_enable_partitions(pr, 1);
2413 ret = blkid_do_fullprobe(pr);
2418 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2419 * but we want the exact opposite, so reverse the return value here.
2421 * In addition print some useful diagnostics about what actually is
2429 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2431 "%s appears to contain an existing "
2432 "filesystem (%s).\n", device, type);
2433 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2435 "%s appears to contain a partition "
2436 "table (%s).\n", device, type);
2439 "%s appears to contain something weird "
2440 "according to blkid\n", device);
2446 blkid_free_probe(pr);
2449 "probe of %s failed, cannot detect "
2450 "existing filesystem.\n", device);
2454 static int group_profile_devs_min(u64 flag)
2456 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2457 case 0: /* single */
2458 case BTRFS_BLOCK_GROUP_DUP:
2460 case BTRFS_BLOCK_GROUP_RAID0:
2461 case BTRFS_BLOCK_GROUP_RAID1:
2462 case BTRFS_BLOCK_GROUP_RAID5:
2464 case BTRFS_BLOCK_GROUP_RAID6:
2466 case BTRFS_BLOCK_GROUP_RAID10:
2473 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2474 u64 dev_cnt, int mixed, int ssd)
2481 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2483 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2485 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2486 BTRFS_BLOCK_GROUP_RAID5;
2489 allowed |= BTRFS_BLOCK_GROUP_DUP;
2493 ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
2495 "ERROR: DUP is not allowed when FS has multiple devices\n");
2498 if (metadata_profile & ~allowed) {
2500 "ERROR: unable to create FS with metadata profile %s "
2501 "(have %llu devices but %d devices are required)\n",
2502 btrfs_group_profile_str(metadata_profile), dev_cnt,
2503 group_profile_devs_min(metadata_profile));
2506 if (data_profile & ~allowed) {
2508 "ERROR: unable to create FS with data profile %s "
2509 "(have %llu devices but %d devices are required)\n",
2510 btrfs_group_profile_str(data_profile), dev_cnt,
2511 group_profile_devs_min(data_profile));
2515 warning_on(!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP) && ssd,
2516 "DUP may not actually lead to 2 copies on the device, see manual page");
2521 int group_profile_max_safe_loss(u64 flags)
2523 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2524 case 0: /* single */
2525 case BTRFS_BLOCK_GROUP_DUP:
2526 case BTRFS_BLOCK_GROUP_RAID0:
2528 case BTRFS_BLOCK_GROUP_RAID1:
2529 case BTRFS_BLOCK_GROUP_RAID5:
2530 case BTRFS_BLOCK_GROUP_RAID10:
2532 case BTRFS_BLOCK_GROUP_RAID6:
2540 * Check if a device is suitable for btrfs
2542 * 1: something is wrong, an error is printed
2545 int test_dev_for_mkfs(char *file, int force_overwrite)
2550 ret = is_swap_device(file);
2552 fprintf(stderr, "ERROR: checking status of %s: %s\n", file,
2557 fprintf(stderr, "ERROR: %s is a swap device\n", file);
2560 if (!force_overwrite) {
2561 if (check_overwrite(file)) {
2562 fprintf(stderr, "Use the -f option to force overwrite.\n");
2566 ret = check_mounted(file);
2568 fprintf(stderr, "ERROR: checking mount status of %s: %s\n",
2569 file, strerror(-ret));
2573 fprintf(stderr, "ERROR: %s is mounted\n", file);
2576 /* check if the device is busy */
2577 fd = open(file, O_RDWR|O_EXCL);
2579 fprintf(stderr, "ERROR: unable to open %s: %s\n", file,
2583 if (fstat(fd, &st)) {
2584 fprintf(stderr, "ERROR: unable to stat %s: %s\n", file,
2589 if (!S_ISBLK(st.st_mode)) {
2590 fprintf(stderr, "ERROR: %s is not a block device\n", file);
2598 int btrfs_scan_lblkid(void)
2603 struct btrfs_fs_devices *tmp_devices;
2604 blkid_dev_iterate iter = NULL;
2605 blkid_dev dev = NULL;
2606 blkid_cache cache = NULL;
2607 char path[PATH_MAX];
2609 if (btrfs_scan_done)
2612 if (blkid_get_cache(&cache, NULL) < 0) {
2613 printf("ERROR: lblkid cache get failed\n");
2616 blkid_probe_all(cache);
2617 iter = blkid_dev_iterate_begin(cache);
2618 blkid_dev_set_search(iter, "TYPE", "btrfs");
2619 while (blkid_dev_next(iter, &dev) == 0) {
2620 dev = blkid_verify(cache, dev);
2623 /* if we are here its definitely a btrfs disk*/
2624 strncpy_null(path, blkid_dev_devname(dev));
2626 fd = open(path, O_RDONLY);
2628 printf("ERROR: could not open %s\n", path);
2631 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2632 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2634 printf("ERROR: could not scan %s\n", path);
2641 blkid_dev_iterate_end(iter);
2642 blkid_put_cache(cache);
2644 btrfs_scan_done = 1;
2649 int is_vol_small(char *file)
2656 fd = open(file, O_RDONLY);
2659 if (fstat(fd, &st) < 0) {
2664 size = btrfs_device_size(fd, &st);
2669 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2679 * This reads a line from the stdin and only returns non-zero if the
2680 * first whitespace delimited token is a case insensitive match with yes
2683 int ask_user(char *question)
2685 char buf[30] = {0,};
2686 char *saveptr = NULL;
2689 printf("%s [y/N]: ", question);
2691 return fgets(buf, sizeof(buf) - 1, stdin) &&
2692 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2693 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2698 * - file or directory return the containing tree root id
2699 * - subvolume return its own tree id
2700 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2701 * undefined and function returns -1
2703 int lookup_ino_rootid(int fd, u64 *rootid)
2705 struct btrfs_ioctl_ino_lookup_args args;
2708 memset(&args, 0, sizeof(args));
2710 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2712 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2714 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2719 *rootid = args.treeid;
2725 * return 0 if a btrfs mount point is found
2726 * return 1 if a mount point is found but not btrfs
2727 * return <0 if something goes wrong
2729 int find_mount_root(const char *path, char **mount_root)
2737 int longest_matchlen = 0;
2738 char *longest_match = NULL;
2740 fd = open(path, O_RDONLY | O_NOATIME);
2745 mnttab = setmntent("/proc/self/mounts", "r");
2749 while ((ent = getmntent(mnttab))) {
2750 len = strlen(ent->mnt_dir);
2751 if (strncmp(ent->mnt_dir, path, len) == 0) {
2752 /* match found and use the latest match */
2753 if (longest_matchlen <= len) {
2754 free(longest_match);
2755 longest_matchlen = len;
2756 longest_match = strdup(ent->mnt_dir);
2757 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2766 free(longest_match);
2771 *mount_root = realpath(longest_match, NULL);
2775 free(longest_match);
2779 int test_minimum_size(const char *file, u32 nodesize)
2782 struct stat statbuf;
2784 fd = open(file, O_RDONLY);
2787 if (stat(file, &statbuf) < 0) {
2791 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
2800 * test if name is a correct subvolume name
2801 * this function return
2802 * 0-> name is not a correct subvolume name
2803 * 1-> name is a correct subvolume name
2805 int test_issubvolname(const char *name)
2807 return name[0] != '\0' && !strchr(name, '/') &&
2808 strcmp(name, ".") && strcmp(name, "..");
2812 * Test if path is a directory
2814 * 0 - path exists but it is not a directory
2815 * 1 - path exists and it is a directory
2818 int test_isdir(const char *path)
2823 ret = stat(path, &st);
2827 return !!S_ISDIR(st.st_mode);
2830 void units_set_mode(unsigned *units, unsigned mode)
2832 unsigned base = *units & UNITS_MODE_MASK;
2834 *units = base | mode;
2837 void units_set_base(unsigned *units, unsigned base)
2839 unsigned mode = *units & ~UNITS_MODE_MASK;
2841 *units = base | mode;
2844 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2848 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2849 if (!path->nodes[level])
2851 if (path->slots[level] + 1 >=
2852 btrfs_header_nritems(path->nodes[level]))
2855 btrfs_item_key_to_cpu(path->nodes[level], key,
2856 path->slots[level] + 1);
2858 btrfs_node_key_to_cpu(path->nodes[level], key,
2859 path->slots[level] + 1);
2865 char* btrfs_group_type_str(u64 flag)
2867 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2868 BTRFS_SPACE_INFO_GLOBAL_RSV;
2870 switch (flag & mask) {
2871 case BTRFS_BLOCK_GROUP_DATA:
2873 case BTRFS_BLOCK_GROUP_SYSTEM:
2875 case BTRFS_BLOCK_GROUP_METADATA:
2877 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2878 return "Data+Metadata";
2879 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2880 return "GlobalReserve";
2886 char* btrfs_group_profile_str(u64 flag)
2888 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2891 case BTRFS_BLOCK_GROUP_RAID0:
2893 case BTRFS_BLOCK_GROUP_RAID1:
2895 case BTRFS_BLOCK_GROUP_RAID5:
2897 case BTRFS_BLOCK_GROUP_RAID6:
2899 case BTRFS_BLOCK_GROUP_DUP:
2901 case BTRFS_BLOCK_GROUP_RAID10:
2908 u64 disk_size(char *path)
2912 if (statfs(path, &sfs) < 0)
2915 return sfs.f_bsize * sfs.f_blocks;
2918 u64 get_partition_size(char *dev)
2921 int fd = open(dev, O_RDONLY);
2925 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2934 int btrfs_tree_search2_ioctl_supported(int fd)
2936 struct btrfs_ioctl_search_args_v2 *args2;
2937 struct btrfs_ioctl_search_key *sk;
2938 int args2_size = 1024;
2939 char args2_buf[args2_size];
2941 static int v2_supported = -1;
2943 if (v2_supported != -1)
2944 return v2_supported;
2946 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2950 * Search for the extent tree item in the root tree.
2952 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2953 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2954 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2955 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2956 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2958 sk->max_offset = (u64)-1;
2959 sk->min_transid = 0;
2960 sk->max_transid = (u64)-1;
2962 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2963 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2964 if (ret == -EOPNOTSUPP)
2971 return v2_supported;
2974 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
2976 if (nodesize < sectorsize) {
2978 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2979 nodesize, sectorsize);
2981 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2983 "ERROR: Illegal nodesize %u (larger than %u)\n",
2984 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2986 } else if (nodesize & (sectorsize - 1)) {
2988 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2989 nodesize, sectorsize);
2991 } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
2992 nodesize != sectorsize) {
2994 "ERROR: Illegal nodesize %u (not equal to %u for mixed block group)\n",
2995 nodesize, sectorsize);
3002 * Copy a path argument from SRC to DEST and check the SRC length if it's at
3003 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
3005 * The destination buffer is zero terminated.
3006 * Return < 0 for error, 0 otherwise.
3008 int arg_copy_path(char *dest, const char *src, int destlen)
3010 size_t len = strlen(src);
3012 if (len >= PATH_MAX || len >= destlen)
3013 return -ENAMETOOLONG;
3015 __strncpy__null(dest, src, destlen);
3020 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
3022 unsigned int unit_mode = UNITS_DEFAULT;
3026 for (arg_i = 0; arg_i < *argc; arg_i++) {
3027 if (!strcmp(argv[arg_i], "--raw")) {
3028 unit_mode = UNITS_RAW;
3032 if (!strcmp(argv[arg_i], "--human-readable")) {
3033 unit_mode = UNITS_HUMAN_BINARY;
3038 if (!strcmp(argv[arg_i], "--iec")) {
3039 units_set_mode(&unit_mode, UNITS_BINARY);
3043 if (!strcmp(argv[arg_i], "--si")) {
3044 units_set_mode(&unit_mode, UNITS_DECIMAL);
3049 if (!strcmp(argv[arg_i], "--kbytes")) {
3050 units_set_base(&unit_mode, UNITS_KBYTES);
3054 if (!strcmp(argv[arg_i], "--mbytes")) {
3055 units_set_base(&unit_mode, UNITS_MBYTES);
3059 if (!strcmp(argv[arg_i], "--gbytes")) {
3060 units_set_base(&unit_mode, UNITS_GBYTES);
3064 if (!strcmp(argv[arg_i], "--tbytes")) {
3065 units_set_base(&unit_mode, UNITS_TBYTES);
3073 if (!strcmp(argv[arg_i], "-b")) {
3074 unit_mode = UNITS_RAW;
3078 if (!strcmp(argv[arg_i], "-h")) {
3079 unit_mode = UNITS_HUMAN_BINARY;
3083 if (!strcmp(argv[arg_i], "-H")) {
3084 unit_mode = UNITS_HUMAN_DECIMAL;
3088 if (!strcmp(argv[arg_i], "-k")) {
3089 units_set_base(&unit_mode, UNITS_KBYTES);
3093 if (!strcmp(argv[arg_i], "-m")) {
3094 units_set_base(&unit_mode, UNITS_MBYTES);
3098 if (!strcmp(argv[arg_i], "-g")) {
3099 units_set_base(&unit_mode, UNITS_GBYTES);
3103 if (!strcmp(argv[arg_i], "-t")) {
3104 units_set_base(&unit_mode, UNITS_TBYTES);
3110 for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
3113 argv[arg_end] = argv[arg_i];
3122 int string_is_numerical(const char *str)
3124 if (!(*str >= '0' && *str <= '9'))
3126 while (*str >= '0' && *str <= '9')
3134 * Preprocess @argv with getopt_long to reorder options and consume the "--"
3136 * Unknown short and long options are reported, optionally the @usage is printed
3139 void clean_args_no_options(int argc, char *argv[], const char * const *usagestr)
3141 static const struct option long_options[] = {
3146 int c = getopt_long(argc, argv, "", long_options, NULL);