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>
41 #include "kerncompat.h"
42 #include "radix-tree.h"
45 #include "transaction.h"
52 #define BLKDISCARD _IO(0x12,119)
55 static int btrfs_scan_done = 0;
57 static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
59 const char *get_argv0_buf(void)
64 void fixup_argv0(char **argv, const char *token)
66 int len = strlen(argv0_buf);
68 snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
72 void set_argv0(char **argv)
74 strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
75 argv0_buf[sizeof(argv0_buf) - 1] = 0;
78 int check_argc_exact(int nargs, int expected)
81 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
83 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
85 return nargs != expected;
88 int check_argc_min(int nargs, int expected)
90 if (nargs < expected) {
91 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
98 int check_argc_max(int nargs, int expected)
100 if (nargs > expected) {
101 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
110 * Discard the given range in one go
112 static int discard_range(int fd, u64 start, u64 len)
114 u64 range[2] = { start, len };
116 if (ioctl(fd, BLKDISCARD, &range) < 0)
122 * Discard blocks in the given range in 1G chunks, the process is interruptible
124 static int discard_blocks(int fd, u64 start, u64 len)
128 u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
131 ret = discard_range(fd, start, chunk_size);
141 static u64 reference_root_table[] = {
142 [1] = BTRFS_ROOT_TREE_OBJECTID,
143 [2] = BTRFS_EXTENT_TREE_OBJECTID,
144 [3] = BTRFS_CHUNK_TREE_OBJECTID,
145 [4] = BTRFS_DEV_TREE_OBJECTID,
146 [5] = BTRFS_FS_TREE_OBJECTID,
147 [6] = BTRFS_CSUM_TREE_OBJECTID,
150 int test_uuid_unique(char *fs_uuid)
153 blkid_dev_iterate iter = NULL;
154 blkid_dev dev = NULL;
155 blkid_cache cache = NULL;
157 if (blkid_get_cache(&cache, 0) < 0) {
158 printf("ERROR: lblkid cache get failed\n");
161 blkid_probe_all(cache);
162 iter = blkid_dev_iterate_begin(cache);
163 blkid_dev_set_search(iter, "UUID", fs_uuid);
165 while (blkid_dev_next(iter, &dev) == 0) {
166 dev = blkid_verify(cache, dev);
173 blkid_dev_iterate_end(iter);
174 blkid_put_cache(cache);
180 * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
182 int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
184 struct btrfs_super_block super;
185 struct extent_buffer *buf = NULL;
186 struct btrfs_root_item root_item;
187 struct btrfs_disk_key disk_key;
188 struct btrfs_extent_item *extent_item;
189 struct btrfs_inode_item *inode_item;
190 struct btrfs_chunk *chunk;
191 struct btrfs_dev_item *dev_item;
192 struct btrfs_dev_extent *dev_extent;
193 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
203 int skinny_metadata = !!(cfg->features &
204 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
207 first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
208 first_free &= ~((u64)cfg->sectorsize - 1);
210 memset(&super, 0, sizeof(super));
212 num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
213 if (cfg->fs_uuid && *cfg->fs_uuid) {
214 if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
215 fprintf(stderr, "could not parse UUID: %s\n",
220 if (!test_uuid_unique(cfg->fs_uuid)) {
221 fprintf(stderr, "non-unique UUID: %s\n", cfg->fs_uuid);
226 uuid_generate(super.fsid);
228 uuid_unparse(super.fsid, cfg->fs_uuid);
230 uuid_generate(super.dev_item.uuid);
231 uuid_generate(chunk_tree_uuid);
233 btrfs_set_super_bytenr(&super, cfg->blocks[0]);
234 btrfs_set_super_num_devices(&super, 1);
235 btrfs_set_super_magic(&super, BTRFS_MAGIC);
236 btrfs_set_super_generation(&super, 1);
237 btrfs_set_super_root(&super, cfg->blocks[1]);
238 btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
239 btrfs_set_super_total_bytes(&super, num_bytes);
240 btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
241 btrfs_set_super_sectorsize(&super, cfg->sectorsize);
242 btrfs_set_super_leafsize(&super, cfg->nodesize);
243 btrfs_set_super_nodesize(&super, cfg->nodesize);
244 btrfs_set_super_stripesize(&super, cfg->stripesize);
245 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
246 btrfs_set_super_chunk_root_generation(&super, 1);
247 btrfs_set_super_cache_generation(&super, -1);
248 btrfs_set_super_incompat_flags(&super, cfg->features);
250 strncpy(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
252 buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
254 /* create the tree of root objects */
255 memset(buf->data, 0, cfg->nodesize);
256 buf->len = cfg->nodesize;
257 btrfs_set_header_bytenr(buf, cfg->blocks[1]);
258 btrfs_set_header_nritems(buf, 4);
259 btrfs_set_header_generation(buf, 1);
260 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
261 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
262 write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
265 write_extent_buffer(buf, chunk_tree_uuid,
266 btrfs_header_chunk_tree_uuid(buf),
269 /* create the items for the root tree */
270 memset(&root_item, 0, sizeof(root_item));
271 inode_item = &root_item.inode;
272 btrfs_set_stack_inode_generation(inode_item, 1);
273 btrfs_set_stack_inode_size(inode_item, 3);
274 btrfs_set_stack_inode_nlink(inode_item, 1);
275 btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
276 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
277 btrfs_set_root_refs(&root_item, 1);
278 btrfs_set_root_used(&root_item, cfg->nodesize);
279 btrfs_set_root_generation(&root_item, 1);
281 memset(&disk_key, 0, sizeof(disk_key));
282 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
283 btrfs_set_disk_key_offset(&disk_key, 0);
286 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
287 btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
288 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
289 btrfs_set_item_key(buf, &disk_key, nritems);
290 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
291 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
293 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
294 nritems), sizeof(root_item));
297 itemoff = itemoff - sizeof(root_item);
298 btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
299 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
300 btrfs_set_item_key(buf, &disk_key, nritems);
301 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
302 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
304 write_extent_buffer(buf, &root_item,
305 btrfs_item_ptr_offset(buf, nritems),
309 itemoff = itemoff - sizeof(root_item);
310 btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
311 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
312 btrfs_set_item_key(buf, &disk_key, nritems);
313 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
314 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
316 write_extent_buffer(buf, &root_item,
317 btrfs_item_ptr_offset(buf, nritems),
321 itemoff = itemoff - sizeof(root_item);
322 btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
323 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
324 btrfs_set_item_key(buf, &disk_key, nritems);
325 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
326 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
328 write_extent_buffer(buf, &root_item,
329 btrfs_item_ptr_offset(buf, nritems),
334 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
335 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
336 if (ret != cfg->nodesize) {
337 ret = (ret < 0 ? -errno : -EIO);
341 /* create the items for the extent tree */
342 memset(buf->data + sizeof(struct btrfs_header), 0,
343 cfg->nodesize - sizeof(struct btrfs_header));
345 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
346 for (i = 1; i < 7; i++) {
347 item_size = sizeof(struct btrfs_extent_item);
348 if (!skinny_metadata)
349 item_size += sizeof(struct btrfs_tree_block_info);
351 BUG_ON(cfg->blocks[i] < first_free);
352 BUG_ON(cfg->blocks[i] < cfg->blocks[i - 1]);
354 /* create extent item */
355 itemoff -= item_size;
356 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
357 if (skinny_metadata) {
358 btrfs_set_disk_key_type(&disk_key,
359 BTRFS_METADATA_ITEM_KEY);
360 btrfs_set_disk_key_offset(&disk_key, 0);
362 btrfs_set_disk_key_type(&disk_key,
363 BTRFS_EXTENT_ITEM_KEY);
364 btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
366 btrfs_set_item_key(buf, &disk_key, nritems);
367 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
369 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
371 extent_item = btrfs_item_ptr(buf, nritems,
372 struct btrfs_extent_item);
373 btrfs_set_extent_refs(buf, extent_item, 1);
374 btrfs_set_extent_generation(buf, extent_item, 1);
375 btrfs_set_extent_flags(buf, extent_item,
376 BTRFS_EXTENT_FLAG_TREE_BLOCK);
379 /* create extent ref */
380 ref_root = reference_root_table[i];
381 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
382 btrfs_set_disk_key_offset(&disk_key, ref_root);
383 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
384 btrfs_set_item_key(buf, &disk_key, nritems);
385 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
387 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
390 btrfs_set_header_bytenr(buf, cfg->blocks[2]);
391 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
392 btrfs_set_header_nritems(buf, nritems);
393 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
394 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
395 if (ret != cfg->nodesize) {
396 ret = (ret < 0 ? -errno : -EIO);
400 /* create the chunk tree */
401 memset(buf->data + sizeof(struct btrfs_header), 0,
402 cfg->nodesize - sizeof(struct btrfs_header));
404 item_size = sizeof(*dev_item);
405 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
407 /* first device 1 (there is no device 0) */
408 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
409 btrfs_set_disk_key_offset(&disk_key, 1);
410 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
411 btrfs_set_item_key(buf, &disk_key, nritems);
412 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
413 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
415 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
416 btrfs_set_device_id(buf, dev_item, 1);
417 btrfs_set_device_generation(buf, dev_item, 0);
418 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
419 btrfs_set_device_bytes_used(buf, dev_item,
420 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
421 btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
422 btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
423 btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
424 btrfs_set_device_type(buf, dev_item, 0);
426 write_extent_buffer(buf, super.dev_item.uuid,
427 (unsigned long)btrfs_device_uuid(dev_item),
429 write_extent_buffer(buf, super.fsid,
430 (unsigned long)btrfs_device_fsid(dev_item),
432 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
436 item_size = btrfs_chunk_item_size(1);
437 itemoff = itemoff - item_size;
439 /* then we have chunk 0 */
440 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
441 btrfs_set_disk_key_offset(&disk_key, 0);
442 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
443 btrfs_set_item_key(buf, &disk_key, nritems);
444 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
445 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
447 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
448 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
449 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
450 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
451 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
452 btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
453 btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
454 btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
455 btrfs_set_chunk_num_stripes(buf, chunk, 1);
456 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
457 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
460 write_extent_buffer(buf, super.dev_item.uuid,
461 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
464 /* copy the key for the chunk to the system array */
465 ptr = super.sys_chunk_array;
466 array_size = sizeof(disk_key);
468 memcpy(ptr, &disk_key, sizeof(disk_key));
469 ptr += sizeof(disk_key);
471 /* copy the chunk to the system array */
472 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
473 array_size += item_size;
475 btrfs_set_super_sys_array_size(&super, array_size);
477 btrfs_set_header_bytenr(buf, cfg->blocks[3]);
478 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
479 btrfs_set_header_nritems(buf, nritems);
480 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
481 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
482 if (ret != cfg->nodesize) {
483 ret = (ret < 0 ? -errno : -EIO);
487 /* create the device tree */
488 memset(buf->data + sizeof(struct btrfs_header), 0,
489 cfg->nodesize - sizeof(struct btrfs_header));
491 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
492 sizeof(struct btrfs_dev_extent);
494 btrfs_set_disk_key_objectid(&disk_key, 1);
495 btrfs_set_disk_key_offset(&disk_key, 0);
496 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
497 btrfs_set_item_key(buf, &disk_key, nritems);
498 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
499 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
500 sizeof(struct btrfs_dev_extent));
501 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
502 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
503 BTRFS_CHUNK_TREE_OBJECTID);
504 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
505 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
506 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
508 write_extent_buffer(buf, chunk_tree_uuid,
509 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
512 btrfs_set_dev_extent_length(buf, dev_extent,
513 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
516 btrfs_set_header_bytenr(buf, cfg->blocks[4]);
517 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
518 btrfs_set_header_nritems(buf, nritems);
519 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
520 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
521 if (ret != cfg->nodesize) {
522 ret = (ret < 0 ? -errno : -EIO);
526 /* create the FS root */
527 memset(buf->data + sizeof(struct btrfs_header), 0,
528 cfg->nodesize - sizeof(struct btrfs_header));
529 btrfs_set_header_bytenr(buf, cfg->blocks[5]);
530 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
531 btrfs_set_header_nritems(buf, 0);
532 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
533 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
534 if (ret != cfg->nodesize) {
535 ret = (ret < 0 ? -errno : -EIO);
538 /* finally create the csum root */
539 memset(buf->data + sizeof(struct btrfs_header), 0,
540 cfg->nodesize - sizeof(struct btrfs_header));
541 btrfs_set_header_bytenr(buf, cfg->blocks[6]);
542 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
543 btrfs_set_header_nritems(buf, 0);
544 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
545 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
546 if (ret != cfg->nodesize) {
547 ret = (ret < 0 ? -errno : -EIO);
551 /* and write out the super block */
552 BUG_ON(sizeof(super) > cfg->sectorsize);
553 memset(buf->data, 0, cfg->sectorsize);
554 memcpy(buf->data, &super, sizeof(super));
555 buf->len = cfg->sectorsize;
556 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
557 ret = pwrite(fd, buf->data, cfg->sectorsize, cfg->blocks[0]);
558 if (ret != cfg->sectorsize) {
559 ret = (ret < 0 ? -errno : -EIO);
570 static const struct btrfs_fs_feature {
574 } mkfs_features[] = {
575 { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
576 "mixed data and metadata block groups" },
577 { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
578 "increased hardlink limit per file to 65536" },
579 { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
580 "raid56 extended format" },
581 { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
582 "reduced-size metadata extent refs" },
583 { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
584 "no explicit hole extents for files" },
585 /* Keep this one last */
586 { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
589 static int parse_one_fs_feature(const char *name, u64 *flags)
594 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
595 if (name[0] == '^' &&
596 !strcmp(mkfs_features[i].name, name + 1)) {
597 *flags &= ~ mkfs_features[i].flag;
599 } else if (!strcmp(mkfs_features[i].name, name)) {
600 *flags |= mkfs_features[i].flag;
608 void btrfs_parse_features_to_string(char *buf, u64 flags)
614 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
615 if (flags & mkfs_features[i].flag) {
618 strcat(buf, mkfs_features[i].name);
623 void btrfs_process_fs_features(u64 flags)
627 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
628 if (flags & mkfs_features[i].flag) {
629 printf("Turning ON incompat feature '%s': %s\n",
630 mkfs_features[i].name,
631 mkfs_features[i].desc);
636 void btrfs_list_all_fs_features(u64 mask_disallowed)
640 fprintf(stderr, "Filesystem features available:\n");
641 for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
642 char *is_default = "";
644 if (mkfs_features[i].flag & mask_disallowed)
646 if (mkfs_features[i].flag & BTRFS_MKFS_DEFAULT_FEATURES)
647 is_default = ", default";
648 fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
649 mkfs_features[i].name,
650 mkfs_features[i].desc,
651 mkfs_features[i].flag,
657 * Return NULL if all features were parsed fine, otherwise return the name of
658 * the first unparsed.
660 char* btrfs_parse_fs_features(char *namelist, u64 *flags)
663 char *save_ptr = NULL; /* Satisfy static checkers */
665 for (this_char = strtok_r(namelist, ",", &save_ptr);
667 this_char = strtok_r(NULL, ",", &save_ptr)) {
668 if (parse_one_fs_feature(this_char, flags))
675 u64 btrfs_device_size(int fd, struct stat *st)
678 if (S_ISREG(st->st_mode)) {
681 if (!S_ISBLK(st->st_mode)) {
684 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
690 static int zero_blocks(int fd, off_t start, size_t len)
692 char *buf = malloc(len);
699 written = pwrite(fd, buf, len, start);
706 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
708 /* don't write outside the device by clamping the region to the device size */
709 static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
711 off_t end = max(start, start + len);
714 /* and don't overwrite the disk labels on sparc */
715 start = max(start, 1024);
716 end = max(end, 1024);
719 start = min_t(u64, start, dev_size);
720 end = min_t(u64, end, dev_size);
722 return zero_blocks(fd, start, end - start);
725 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
726 struct btrfs_root *root, int fd, char *path,
727 u64 block_count, u32 io_width, u32 io_align,
730 struct btrfs_super_block *disk_super;
731 struct btrfs_super_block *super = root->fs_info->super_copy;
732 struct btrfs_device *device;
733 struct btrfs_dev_item *dev_item;
739 device = kzalloc(sizeof(*device), GFP_NOFS);
742 buf = kzalloc(sectorsize, GFP_NOFS);
745 BUG_ON(sizeof(*disk_super) > sectorsize);
747 disk_super = (struct btrfs_super_block *)buf;
748 dev_item = &disk_super->dev_item;
750 uuid_generate(device->uuid);
753 device->io_width = io_width;
754 device->io_align = io_align;
755 device->sector_size = sectorsize;
757 device->writeable = 1;
758 device->total_bytes = block_count;
759 device->bytes_used = 0;
760 device->total_ios = 0;
761 device->dev_root = root->fs_info->dev_root;
762 device->name = strdup(path);
766 ret = btrfs_add_device(trans, root, device);
769 total_bytes = btrfs_super_total_bytes(super) + block_count;
770 btrfs_set_super_total_bytes(super, total_bytes);
772 num_devs = btrfs_super_num_devices(super) + 1;
773 btrfs_set_super_num_devices(super, num_devs);
775 memcpy(disk_super, super, sizeof(*disk_super));
777 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
778 btrfs_set_stack_device_id(dev_item, device->devid);
779 btrfs_set_stack_device_type(dev_item, device->type);
780 btrfs_set_stack_device_io_align(dev_item, device->io_align);
781 btrfs_set_stack_device_io_width(dev_item, device->io_width);
782 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
783 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
784 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
785 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
787 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
788 BUG_ON(ret != sectorsize);
791 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
792 device->fs_devices = root->fs_info->fs_devices;
801 static int btrfs_wipe_existing_sb(int fd)
803 const char *off = NULL;
808 blkid_probe pr = NULL;
810 pr = blkid_new_probe();
814 if (blkid_probe_set_device(pr, fd, 0, 0)) {
819 ret = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
821 ret = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
823 if (ret || len == 0 || off == NULL) {
825 * If lookup fails, the probe did not find any values, eg. for
826 * a file image or a loop device. Soft error.
832 offset = strtoll(off, NULL, 10);
833 if (len > sizeof(buf))
837 ret = pwrite(fd, buf, len, offset);
839 fprintf(stderr, "ERROR: cannot wipe existing superblock\n");
845 blkid_free_probe(pr);
849 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
850 u64 max_block_count, int discard)
856 ret = fstat(fd, &st);
858 fprintf(stderr, "unable to stat %s\n", file);
862 block_count = btrfs_device_size(fd, &st);
863 if (block_count == 0) {
864 fprintf(stderr, "unable to find %s size\n", file);
868 block_count = min(block_count, max_block_count);
872 * We intentionally ignore errors from the discard ioctl. It
873 * is not necessary for the mkfs functionality but just an
876 if (discard_range(fd, 0, 0) == 0) {
877 printf("Performing full device TRIM (%s) ...\n",
878 pretty_size(block_count));
879 discard_blocks(fd, 0, block_count);
883 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
884 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
885 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
886 BTRFS_SUPER_INFO_SIZE, block_count);
887 if (!ret && zero_end)
888 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
889 ZERO_DEV_BYTES, block_count);
892 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
893 file, strerror(-ret));
897 ret = btrfs_wipe_existing_sb(fd);
899 fprintf(stderr, "ERROR: cannot wipe superblocks on '%s'\n",
904 *block_count_ret = block_count;
908 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
909 struct btrfs_root *root, u64 objectid)
912 struct btrfs_inode_item inode_item;
913 time_t now = time(NULL);
915 memset(&inode_item, 0, sizeof(inode_item));
916 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
917 btrfs_set_stack_inode_size(&inode_item, 0);
918 btrfs_set_stack_inode_nlink(&inode_item, 1);
919 btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
920 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
921 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
922 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
923 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
924 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
925 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
926 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
927 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
928 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
930 if (root->fs_info->tree_root == root)
931 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
933 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
937 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
941 btrfs_set_root_dirid(&root->root_item, objectid);
948 * checks if a path is a block device node
949 * Returns negative errno on failure, otherwise
950 * returns 1 for blockdev, 0 for not-blockdev
952 int is_block_device(const char *path)
956 if (stat(path, &statbuf) < 0)
959 return !!S_ISBLK(statbuf.st_mode);
963 * check if given path is a mount point
964 * return 1 if yes. 0 if no. -1 for error
966 int is_mount_point(const char *path)
972 f = setmntent("/proc/self/mounts", "r");
976 while ((mnt = getmntent(f)) != NULL) {
977 if (strcmp(mnt->mnt_dir, path))
986 static int is_reg_file(const char *path)
990 if (stat(path, &statbuf) < 0)
992 return S_ISREG(statbuf.st_mode);
996 * This function checks if the given input parameter is
998 * return <0 : some error in the given input
999 * return BTRFS_ARG_UNKNOWN: unknown input
1000 * return BTRFS_ARG_UUID: given input is uuid
1001 * return BTRFS_ARG_MNTPOINT: given input is path
1002 * return BTRFS_ARG_REG: given input is regular file
1004 int check_arg_type(const char *input)
1007 char path[PATH_MAX];
1012 if (realpath(input, path)) {
1013 if (is_block_device(path) == 1)
1014 return BTRFS_ARG_BLKDEV;
1016 if (is_mount_point(path) == 1)
1017 return BTRFS_ARG_MNTPOINT;
1019 if (is_reg_file(path))
1020 return BTRFS_ARG_REG;
1022 return BTRFS_ARG_UNKNOWN;
1025 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
1026 !uuid_parse(input, uuid))
1027 return BTRFS_ARG_UUID;
1029 return BTRFS_ARG_UNKNOWN;
1033 * Find the mount point for a mounted device.
1034 * On success, returns 0 with mountpoint in *mp.
1035 * On failure, returns -errno (not mounted yields -EINVAL)
1036 * Is noisy on failures, expects to be given a mounted device.
1038 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
1043 ret = is_block_device(dev);
1046 fprintf(stderr, "%s is not a block device\n", dev);
1049 fprintf(stderr, "Could not check %s: %s\n",
1050 dev, strerror(-ret));
1055 fd = open(dev, O_RDONLY);
1058 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
1062 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
1065 } else { /* mounted, all good */
1075 * Given a pathname, return a filehandle to:
1076 * the original pathname or,
1077 * if the pathname is a mounted btrfs device, to its mountpoint.
1079 * On error, return -1, errno should be set.
1081 int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
1086 if (is_block_device(path)) {
1087 ret = get_btrfs_mount(path, mp, sizeof(mp));
1089 /* not a mounted btrfs dev */
1090 error_on(verbose, "'%s' is not a mounted btrfs device",
1095 ret = open_file_or_dir(mp, dirstream);
1096 error_on(verbose && ret < 0, "can't access '%s': %s",
1097 path, strerror(errno));
1099 ret = btrfs_open_dir(path, dirstream, 1);
1106 * Do the following checks before calling open_file_or_dir():
1107 * 1: path is in a btrfs filesystem
1108 * 2: path is a directory
1110 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
1116 if (statfs(path, &stfs) != 0) {
1119 "ERROR: can't access '%s': %s\n",
1120 path, strerror(errno));
1124 if (stfs.f_type != BTRFS_SUPER_MAGIC) {
1127 "ERROR: not a btrfs filesystem: %s\n",
1132 if (stat(path, &st) != 0) {
1135 "ERROR: can't access '%s': %s\n",
1136 path, strerror(errno));
1140 if (!S_ISDIR(st.st_mode)) {
1143 "ERROR: not a directory: %s\n",
1148 ret = open_file_or_dir(path, dirstream);
1152 "ERROR: can't access '%s': %s\n",
1153 path, strerror(errno));
1159 /* checks if a device is a loop device */
1160 static int is_loop_device (const char* device) {
1161 struct stat statbuf;
1163 if(stat(device, &statbuf) < 0)
1166 return (S_ISBLK(statbuf.st_mode) &&
1167 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
1171 /* Takes a loop device path (e.g. /dev/loop0) and returns
1172 * the associated file (e.g. /images/my_btrfs.img) */
1173 static int resolve_loop_device(const char* loop_dev, char* loop_file,
1180 char real_loop_dev[PATH_MAX];
1182 if (!realpath(loop_dev, real_loop_dev))
1184 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
1185 if (!(f = fopen(p, "r")))
1188 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
1189 ret = fscanf(f, fmt, loop_file);
1198 * Checks whether a and b are identical or device
1199 * files associated with the same block device
1201 static int is_same_blk_file(const char* a, const char* b)
1203 struct stat st_buf_a, st_buf_b;
1204 char real_a[PATH_MAX];
1205 char real_b[PATH_MAX];
1207 if (!realpath(a, real_a))
1208 strncpy_null(real_a, a);
1210 if (!realpath(b, real_b))
1211 strncpy_null(real_b, b);
1213 /* Identical path? */
1214 if (strcmp(real_a, real_b) == 0)
1217 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
1218 if (errno == ENOENT)
1223 /* Same blockdevice? */
1224 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
1225 st_buf_a.st_rdev == st_buf_b.st_rdev) {
1230 if (st_buf_a.st_dev == st_buf_b.st_dev &&
1231 st_buf_a.st_ino == st_buf_b.st_ino) {
1238 /* checks if a and b are identical or device
1239 * files associated with the same block device or
1240 * if one file is a loop device that uses the other
1243 static int is_same_loop_file(const char* a, const char* b)
1245 char res_a[PATH_MAX];
1246 char res_b[PATH_MAX];
1247 const char* final_a = NULL;
1248 const char* final_b = NULL;
1251 /* Resolve a if it is a loop device */
1252 if((ret = is_loop_device(a)) < 0) {
1257 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1268 /* Resolve b if it is a loop device */
1269 if ((ret = is_loop_device(b)) < 0) {
1274 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1285 return is_same_blk_file(final_a, final_b);
1288 /* Checks if a file exists and is a block or regular file*/
1289 static int is_existing_blk_or_reg_file(const char* filename)
1293 if(stat(filename, &st_buf) < 0) {
1300 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1303 /* Checks if a file is used (directly or indirectly via a loop device)
1304 * by a device in fs_devices
1306 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1310 struct list_head *head;
1311 struct list_head *cur;
1312 struct btrfs_device *device;
1314 head = &fs_devices->devices;
1315 list_for_each(cur, head) {
1316 device = list_entry(cur, struct btrfs_device, dev_list);
1318 if((ret = is_same_loop_file(device->name, file)))
1326 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1327 * Returns NULL on invalid input or malloc failure; Other failures
1328 * will be handled by the caller using the input pathame.
1330 char *canonicalize_dm_name(const char *ptname)
1334 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1336 if (!ptname || !*ptname)
1339 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1340 if (!(f = fopen(path, "r")))
1343 /* read <name>\n from sysfs */
1344 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1345 name[sz - 1] = '\0';
1346 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1348 if (access(path, F_OK) == 0)
1356 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1357 * to a device mapper pathname.
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_path(const char *path)
1363 char *canonical, *p;
1365 if (!path || !*path)
1368 canonical = realpath(path, NULL);
1370 return strdup(path);
1371 p = strrchr(canonical, '/');
1372 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1373 char *dm = canonicalize_dm_name(p + 1);
1384 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1385 * is safe to continue.
1387 int check_mounted(const char* file)
1392 fd = open(file, O_RDONLY);
1394 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1398 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1404 int check_mounted_where(int fd, const char *file, char *where, int size,
1405 struct btrfs_fs_devices **fs_dev_ret)
1410 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1414 /* scan the initial device */
1415 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1416 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1417 is_btrfs = (ret >= 0);
1419 /* scan other devices */
1420 if (is_btrfs && total_devs > 1) {
1421 ret = btrfs_scan_lblkid();
1426 /* iterate over the list of currently mountes filesystems */
1427 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1430 while ((mnt = getmntent (f)) != NULL) {
1432 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1435 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1437 /* ignore entries in the mount table that are not
1438 associated with a file*/
1439 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1440 goto out_mntloop_err;
1444 ret = is_same_loop_file(file, mnt->mnt_fsname);
1448 goto out_mntloop_err;
1453 /* Did we find an entry in mnt table? */
1454 if (mnt && size && where) {
1455 strncpy(where, mnt->mnt_dir, size);
1459 *fs_dev_ret = fs_devices_mnt;
1461 ret = (mnt != NULL);
1469 struct pending_dir {
1470 struct list_head list;
1471 char name[PATH_MAX];
1474 int btrfs_register_one_device(const char *fname)
1476 struct btrfs_ioctl_vol_args args;
1481 fd = open("/dev/btrfs-control", O_RDWR);
1483 fprintf(stderr, "failed to open /dev/btrfs-control "
1484 "skipping device registration: %s\n",
1488 memset(&args, 0, sizeof(args));
1489 strncpy_null(args.name, fname);
1490 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1493 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1494 fname, strerror(e));
1502 * Register all devices in the fs_uuid list created in the user
1503 * space. Ensure btrfs_scan_lblkid() is called before this func.
1505 int btrfs_register_all_devices(void)
1508 struct btrfs_fs_devices *fs_devices;
1509 struct btrfs_device *device;
1510 struct list_head *all_uuids;
1512 all_uuids = btrfs_scanned_uuids();
1514 list_for_each_entry(fs_devices, all_uuids, list) {
1515 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1516 if (strlen(device->name) != 0) {
1517 err = btrfs_register_one_device(device->name);
1528 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1531 struct btrfs_super_block *disk_super;
1535 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1540 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1541 if (ret != BTRFS_SUPER_INFO_SIZE)
1545 disk_super = (struct btrfs_super_block *)buf;
1546 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1549 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1559 * Note: this function uses a static per-thread buffer. Do not call this
1560 * function more than 10 times within one argument list!
1562 const char *pretty_size_mode(u64 size, unsigned mode)
1564 static __thread int ps_index = 0;
1565 static __thread char ps_array[10][32];
1568 ret = ps_array[ps_index];
1571 (void)pretty_size_snprintf(size, ret, 32, mode);
1576 static const char* unit_suffix_binary[] =
1577 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1578 static const char* unit_suffix_decimal[] =
1579 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1581 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1587 const char** suffix = NULL;
1593 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1594 snprintf(str, str_size, "%llu", size);
1598 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1601 suffix = unit_suffix_binary;
1602 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1605 suffix = unit_suffix_decimal;
1610 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1618 switch (unit_mode & UNITS_MODE_MASK) {
1619 case UNITS_TBYTES: base *= mult; num_divs++;
1620 case UNITS_GBYTES: base *= mult; num_divs++;
1621 case UNITS_MBYTES: base *= mult; num_divs++;
1622 case UNITS_KBYTES: num_divs++;
1629 while (size >= mult) {
1636 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1638 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1643 fraction = (float)last_size / base;
1645 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1649 * __strncpy__null - strncpy with null termination
1650 * @dest: the target array
1651 * @src: the source string
1652 * @n: maximum bytes to copy (size of *dest)
1654 * Like strncpy, but ensures destination is null-terminated.
1656 * Copies the string pointed to by src, including the terminating null
1657 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1658 * of n bytes. Then ensure that dest is null-terminated.
1660 char *__strncpy__null(char *dest, const char *src, size_t n)
1662 strncpy(dest, src, n);
1669 * Checks to make sure that the label matches our requirements.
1671 0 if everything is safe and usable
1672 -1 if the label is too long
1674 static int check_label(const char *input)
1676 int len = strlen(input);
1678 if (len > BTRFS_LABEL_SIZE - 1) {
1679 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1680 input, BTRFS_LABEL_SIZE - 1);
1687 static int set_label_unmounted(const char *dev, const char *label)
1689 struct btrfs_trans_handle *trans;
1690 struct btrfs_root *root;
1693 ret = check_mounted(dev);
1695 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1699 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1704 /* Open the super_block at the default location
1705 * and as read-write.
1707 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1708 if (!root) /* errors are printed by open_ctree() */
1711 trans = btrfs_start_transaction(root, 1);
1712 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1714 btrfs_commit_transaction(trans, root);
1716 /* Now we close it since we are done. */
1721 static int set_label_mounted(const char *mount_path, const char *label)
1725 fd = open(mount_path, O_RDONLY | O_NOATIME);
1727 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1731 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1732 fprintf(stderr, "ERROR: unable to set label %s\n",
1742 int get_label_unmounted(const char *dev, char *label)
1744 struct btrfs_root *root;
1747 ret = check_mounted(dev);
1749 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1753 /* Open the super_block at the default location
1756 root = open_ctree(dev, 0, 0);
1760 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1762 /* Now we close it since we are done. */
1768 * If a partition is mounted, try to get the filesystem label via its
1769 * mounted path rather than device. Return the corresponding error
1770 * the user specified the device path.
1772 int get_label_mounted(const char *mount_path, char *labelp)
1774 char label[BTRFS_LABEL_SIZE];
1778 fd = open(mount_path, O_RDONLY | O_NOATIME);
1780 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1784 memset(label, '\0', sizeof(label));
1785 ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
1787 if (errno != ENOTTY)
1788 fprintf(stderr, "ERROR: unable to get label %s\n",
1795 strncpy(labelp, label, sizeof(label));
1800 int get_label(const char *btrfs_dev, char *label)
1804 ret = is_existing_blk_or_reg_file(btrfs_dev);
1806 ret = get_label_mounted(btrfs_dev, label);
1808 ret = get_label_unmounted(btrfs_dev, label);
1813 int set_label(const char *btrfs_dev, const char *label)
1817 if (check_label(label))
1820 ret = is_existing_blk_or_reg_file(btrfs_dev);
1822 ret = set_label_mounted(btrfs_dev, label);
1824 ret = set_label_unmounted(btrfs_dev, label);
1830 * Unsafe subvolume check.
1832 * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
1833 * btrfs mount point.
1834 * Must use together with other reliable method like btrfs ioctl.
1836 static int __is_subvol(const char *path)
1841 ret = lstat(path, &st);
1845 return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
1849 * A not-so-good version fls64. No fascinating optimization since
1850 * no one except parse_size use it
1852 static int fls64(u64 x)
1856 for (i = 0; i <64; i++)
1857 if (x << i & (1ULL << 63))
1862 u64 parse_size(char *s)
1870 fprintf(stderr, "ERROR: Size value is empty\n");
1875 "ERROR: Size value '%s' is less equal than 0\n", s);
1878 ret = strtoull(s, &endptr, 10);
1880 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1883 if (endptr[0] && endptr[1]) {
1884 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1889 * strtoll returns LLONG_MAX when overflow, if this happens,
1890 * need to call strtoull to get the real size
1892 if (errno == ERANGE && ret == ULLONG_MAX) {
1894 "ERROR: Size value '%s' is too large for u64\n", s);
1898 c = tolower(endptr[0]);
1921 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1926 /* Check whether ret * mult overflow */
1927 if (fls64(ret) + fls64(mult) - 1 > 64) {
1929 "ERROR: Size value '%s' is too large for u64\n", s);
1936 u64 parse_qgroupid(const char *p)
1938 char *s = strchr(p, '/');
1939 const char *ptr_src_end = p + strlen(p);
1940 char *ptr_parse_end = NULL;
1949 /* Numeric format like '0/257' is the primary case */
1951 id = strtoull(p, &ptr_parse_end, 10);
1952 if (ptr_parse_end != ptr_src_end)
1956 level = strtoull(p, &ptr_parse_end, 10);
1957 if (ptr_parse_end != s)
1960 id = strtoull(s + 1, &ptr_parse_end, 10);
1961 if (ptr_parse_end != ptr_src_end)
1964 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
1967 /* Path format like subv at 'my_subvol' is the fallback case */
1968 ret = __is_subvol(p);
1969 if (ret < 0 || !ret)
1971 fd = open(p, O_RDONLY);
1974 ret = lookup_ino_rootid(fd, &id);
1981 fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
1985 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
1991 ret = stat(fname, &st);
1995 if (S_ISDIR(st.st_mode)) {
1996 *dirstream = opendir(fname);
1999 fd = dirfd(*dirstream);
2000 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
2001 fd = open(fname, open_flags);
2004 * we set this on purpose, in case the caller output
2005 * strerror(errno) as success
2013 closedir(*dirstream);
2020 int open_file_or_dir(const char *fname, DIR **dirstream)
2022 return open_file_or_dir3(fname, dirstream, O_RDWR);
2025 void close_file_or_dir(int fd, DIR *dirstream)
2028 closedir(dirstream);
2033 int get_device_info(int fd, u64 devid,
2034 struct btrfs_ioctl_dev_info_args *di_args)
2038 di_args->devid = devid;
2039 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
2041 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
2042 return ret ? -errno : 0;
2045 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
2048 struct btrfs_dev_item *dev_item;
2049 char *buf = search_args->buf;
2051 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
2052 + sizeof(struct btrfs_dev_item));
2053 buf += sizeof(struct btrfs_ioctl_search_header);
2055 dev_item = (struct btrfs_dev_item *)buf;
2057 return btrfs_stack_device_id(dev_item);
2060 static int search_chunk_tree_for_fs_info(int fd,
2061 struct btrfs_ioctl_fs_info_args *fi_args)
2065 u64 start_devid = 1;
2066 struct btrfs_ioctl_search_args search_args;
2067 struct btrfs_ioctl_search_key *search_key = &search_args.key;
2069 fi_args->num_devices = 0;
2071 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
2072 / (sizeof(struct btrfs_ioctl_search_header)
2073 + sizeof(struct btrfs_dev_item));
2075 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
2076 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2077 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2078 search_key->min_type = BTRFS_DEV_ITEM_KEY;
2079 search_key->max_type = BTRFS_DEV_ITEM_KEY;
2080 search_key->min_transid = 0;
2081 search_key->max_transid = (u64)-1;
2082 search_key->nr_items = max_items;
2083 search_key->max_offset = (u64)-1;
2086 search_key->min_offset = start_devid;
2088 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
2092 fi_args->num_devices += (u64)search_key->nr_items;
2094 if (search_key->nr_items == max_items) {
2095 start_devid = find_max_device_id(&search_args,
2096 search_key->nr_items) + 1;
2100 /* get the lastest max_id to stay consistent with the num_devices */
2101 if (search_key->nr_items == 0)
2103 * last tree_search returns an empty buf, use the devid of
2104 * the last dev_item of the previous tree_search
2106 fi_args->max_id = start_devid - 1;
2108 fi_args->max_id = find_max_device_id(&search_args,
2109 search_key->nr_items);
2115 * For a given path, fill in the ioctl fs_ and info_ args.
2116 * If the path is a btrfs mountpoint, fill info for all devices.
2117 * If the path is a btrfs device, fill in only that device.
2119 * The path provided must be either on a mounted btrfs fs,
2120 * or be a mounted btrfs device.
2122 * Returns 0 on success, or a negative errno.
2124 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
2125 struct btrfs_ioctl_dev_info_args **di_ret)
2132 struct btrfs_fs_devices *fs_devices_mnt = NULL;
2133 struct btrfs_ioctl_dev_info_args *di_args;
2134 struct btrfs_ioctl_dev_info_args tmp;
2136 DIR *dirstream = NULL;
2138 memset(fi_args, 0, sizeof(*fi_args));
2140 if (is_block_device(path) == 1) {
2141 struct btrfs_super_block *disk_super;
2142 char buf[BTRFS_SUPER_INFO_SIZE];
2145 /* Ensure it's mounted, then set path to the mountpoint */
2146 fd = open(path, O_RDONLY);
2149 fprintf(stderr, "Couldn't open %s: %s\n",
2150 path, strerror(errno));
2153 ret = check_mounted_where(fd, path, mp, sizeof(mp),
2162 /* Only fill in this one device */
2163 fi_args->num_devices = 1;
2165 disk_super = (struct btrfs_super_block *)buf;
2166 ret = btrfs_read_dev_super(fd, disk_super,
2167 BTRFS_SUPER_INFO_OFFSET, 0);
2172 devid = btrfs_stack_device_id(&disk_super->dev_item);
2174 fi_args->max_id = devid;
2177 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
2181 /* at this point path must not be for a block device */
2182 fd = open_file_or_dir(path, &dirstream);
2188 /* fill in fi_args if not just a single device */
2189 if (fi_args->num_devices != 1) {
2190 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
2197 * The fs_args->num_devices does not include seed devices
2199 ret = search_chunk_tree_for_fs_info(fd, fi_args);
2204 * search_chunk_tree_for_fs_info() will lacks the devid 0
2205 * so manual probe for it here.
2207 ret = get_device_info(fd, 0, &tmp);
2209 fi_args->num_devices++;
2217 if (!fi_args->num_devices)
2220 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
2227 memcpy(di_args, &tmp, sizeof(tmp));
2228 for (; i <= fi_args->max_id; ++i) {
2229 ret = get_device_info(fd, i, &di_args[ndevs]);
2238 * only when the only dev we wanted to find is not there then
2239 * let any error be returned
2241 if (fi_args->num_devices != 1) {
2247 close_file_or_dir(fd, dirstream);
2251 #define isoctal(c) (((c) & ~7) == '0')
2253 static inline void translate(char *f, char *t)
2255 while (*f != '\0') {
2257 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
2258 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
2268 * Checks if the swap device.
2269 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2271 static int is_swap_device(const char *file)
2282 if (stat(file, &st_buf) < 0)
2284 if (S_ISBLK(st_buf.st_mode))
2285 dev = st_buf.st_rdev;
2286 else if (S_ISREG(st_buf.st_mode)) {
2287 dev = st_buf.st_dev;
2288 ino = st_buf.st_ino;
2292 if ((f = fopen("/proc/swaps", "r")) == NULL)
2295 /* skip the first line */
2296 if (fgets(tmp, sizeof(tmp), f) == NULL)
2299 while (fgets(tmp, sizeof(tmp), f) != NULL) {
2300 if ((cp = strchr(tmp, ' ')) != NULL)
2302 if ((cp = strchr(tmp, '\t')) != NULL)
2304 translate(tmp, buf);
2305 if (stat(buf, &st_buf) != 0)
2307 if (S_ISBLK(st_buf.st_mode)) {
2308 if (dev == st_buf.st_rdev) {
2312 } else if (S_ISREG(st_buf.st_mode)) {
2313 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
2327 * Check for existing filesystem or partition table on device.
2329 * 1 for existing fs or partition
2330 * 0 for nothing found
2331 * -1 for internal error
2338 blkid_probe pr = NULL;
2342 if (!device || !*device)
2345 ret = -1; /* will reset on success of all setup calls */
2347 pr = blkid_new_probe_from_filename(device);
2351 size = blkid_probe_get_size(pr);
2355 /* nothing to overwrite on a 0-length device */
2361 ret = blkid_probe_enable_partitions(pr, 1);
2365 ret = blkid_do_fullprobe(pr);
2370 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2371 * but we want the exact opposite, so reverse the return value here.
2373 * In addition print some useful diagnostics about what actually is
2381 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2383 "%s appears to contain an existing "
2384 "filesystem (%s).\n", device, type);
2385 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2387 "%s appears to contain a partition "
2388 "table (%s).\n", device, type);
2391 "%s appears to contain something weird "
2392 "according to blkid\n", device);
2398 blkid_free_probe(pr);
2401 "probe of %s failed, cannot detect "
2402 "existing filesystem.\n", device);
2406 static int group_profile_devs_min(u64 flag)
2408 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2409 case 0: /* single */
2410 case BTRFS_BLOCK_GROUP_DUP:
2412 case BTRFS_BLOCK_GROUP_RAID0:
2413 case BTRFS_BLOCK_GROUP_RAID1:
2414 case BTRFS_BLOCK_GROUP_RAID5:
2416 case BTRFS_BLOCK_GROUP_RAID6:
2418 case BTRFS_BLOCK_GROUP_RAID10:
2425 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2426 u64 dev_cnt, int mixed)
2433 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2435 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2437 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2438 BTRFS_BLOCK_GROUP_RAID5;
2441 allowed |= BTRFS_BLOCK_GROUP_DUP;
2445 ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
2447 "ERROR: DUP is not allowed when FS has multiple devices\n");
2450 if (metadata_profile & ~allowed) {
2452 "ERROR: unable to create FS with metadata profile %s "
2453 "(have %llu devices but %d devices are required)\n",
2454 btrfs_group_profile_str(metadata_profile), dev_cnt,
2455 group_profile_devs_min(metadata_profile));
2458 if (data_profile & ~allowed) {
2460 "ERROR: unable to create FS with data profile %s "
2461 "(have %llu devices but %d devices are required)\n",
2462 btrfs_group_profile_str(data_profile), dev_cnt,
2463 group_profile_devs_min(data_profile));
2467 if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
2469 "ERROR: DUP for data is allowed only in mixed mode\n");
2475 int group_profile_max_safe_loss(u64 flags)
2477 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2478 case 0: /* single */
2479 case BTRFS_BLOCK_GROUP_DUP:
2480 case BTRFS_BLOCK_GROUP_RAID0:
2482 case BTRFS_BLOCK_GROUP_RAID1:
2483 case BTRFS_BLOCK_GROUP_RAID5:
2484 case BTRFS_BLOCK_GROUP_RAID10:
2486 case BTRFS_BLOCK_GROUP_RAID6:
2494 * Check if a device is suitable for btrfs
2496 * 1: something is wrong, an error is printed
2499 int test_dev_for_mkfs(char *file, int force_overwrite)
2504 ret = is_swap_device(file);
2506 fprintf(stderr, "ERROR: checking status of %s: %s\n", file,
2511 fprintf(stderr, "ERROR: %s is a swap device\n", file);
2514 if (!force_overwrite) {
2515 if (check_overwrite(file)) {
2516 fprintf(stderr, "Use the -f option to force overwrite.\n");
2520 ret = check_mounted(file);
2522 fprintf(stderr, "ERROR: checking mount status of %s: %s\n",
2523 file, strerror(-ret));
2527 fprintf(stderr, "ERROR: %s is mounted\n", file);
2530 /* check if the device is busy */
2531 fd = open(file, O_RDWR|O_EXCL);
2533 fprintf(stderr, "ERROR: unable to open %s: %s\n", file,
2537 if (fstat(fd, &st)) {
2538 fprintf(stderr, "ERROR: unable to stat %s: %s\n", file,
2543 if (!S_ISBLK(st.st_mode)) {
2544 fprintf(stderr, "ERROR: %s is not a block device\n", file);
2552 int btrfs_scan_lblkid(void)
2557 struct btrfs_fs_devices *tmp_devices;
2558 blkid_dev_iterate iter = NULL;
2559 blkid_dev dev = NULL;
2560 blkid_cache cache = NULL;
2561 char path[PATH_MAX];
2563 if (btrfs_scan_done)
2566 if (blkid_get_cache(&cache, 0) < 0) {
2567 printf("ERROR: lblkid cache get failed\n");
2570 blkid_probe_all(cache);
2571 iter = blkid_dev_iterate_begin(cache);
2572 blkid_dev_set_search(iter, "TYPE", "btrfs");
2573 while (blkid_dev_next(iter, &dev) == 0) {
2574 dev = blkid_verify(cache, dev);
2577 /* if we are here its definitely a btrfs disk*/
2578 strncpy_null(path, blkid_dev_devname(dev));
2580 fd = open(path, O_RDONLY);
2582 printf("ERROR: could not open %s\n", path);
2585 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2586 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2588 printf("ERROR: could not scan %s\n", path);
2595 blkid_dev_iterate_end(iter);
2596 blkid_put_cache(cache);
2598 btrfs_scan_done = 1;
2603 int is_vol_small(char *file)
2610 fd = open(file, O_RDONLY);
2613 if (fstat(fd, &st) < 0) {
2618 size = btrfs_device_size(fd, &st);
2623 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2633 * This reads a line from the stdin and only returns non-zero if the
2634 * first whitespace delimited token is a case insensitive match with yes
2637 int ask_user(char *question)
2639 char buf[30] = {0,};
2640 char *saveptr = NULL;
2643 printf("%s [y/N]: ", question);
2645 return fgets(buf, sizeof(buf) - 1, stdin) &&
2646 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2647 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2652 * - file or directory return the containing tree root id
2653 * - subvolume return its own tree id
2654 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2655 * undefined and function returns -1
2657 int lookup_ino_rootid(int fd, u64 *rootid)
2659 struct btrfs_ioctl_ino_lookup_args args;
2663 memset(&args, 0, sizeof(args));
2665 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2667 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2670 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2675 *rootid = args.treeid;
2681 * return 0 if a btrfs mount point is found
2682 * return 1 if a mount point is found but not btrfs
2683 * return <0 if something goes wrong
2685 int find_mount_root(const char *path, char **mount_root)
2693 int longest_matchlen = 0;
2694 char *longest_match = NULL;
2696 fd = open(path, O_RDONLY | O_NOATIME);
2701 mnttab = setmntent("/proc/self/mounts", "r");
2705 while ((ent = getmntent(mnttab))) {
2706 len = strlen(ent->mnt_dir);
2707 if (strncmp(ent->mnt_dir, path, len) == 0) {
2708 /* match found and use the latest match */
2709 if (longest_matchlen <= len) {
2710 free(longest_match);
2711 longest_matchlen = len;
2712 longest_match = strdup(ent->mnt_dir);
2713 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2722 free(longest_match);
2727 *mount_root = realpath(longest_match, NULL);
2731 free(longest_match);
2735 int test_minimum_size(const char *file, u32 nodesize)
2738 struct stat statbuf;
2740 fd = open(file, O_RDONLY);
2743 if (stat(file, &statbuf) < 0) {
2747 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
2756 * test if name is a correct subvolume name
2757 * this function return
2758 * 0-> name is not a correct subvolume name
2759 * 1-> name is a correct subvolume name
2761 int test_issubvolname(const char *name)
2763 return name[0] != '\0' && !strchr(name, '/') &&
2764 strcmp(name, ".") && strcmp(name, "..");
2768 * test if path is a directory
2769 * this function return
2770 * 0-> path exists but it is not a directory
2771 * 1-> path exists and it is a directory
2772 * -1 -> path is unaccessible
2774 int test_isdir(const char *path)
2779 ret = stat(path, &st);
2783 return S_ISDIR(st.st_mode);
2786 void units_set_mode(unsigned *units, unsigned mode)
2788 unsigned base = *units & UNITS_MODE_MASK;
2790 *units = base | mode;
2793 void units_set_base(unsigned *units, unsigned base)
2795 unsigned mode = *units & ~UNITS_MODE_MASK;
2797 *units = base | mode;
2800 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2804 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2805 if (!path->nodes[level])
2807 if (path->slots[level] + 1 >=
2808 btrfs_header_nritems(path->nodes[level]))
2811 btrfs_item_key_to_cpu(path->nodes[level], key,
2812 path->slots[level] + 1);
2814 btrfs_node_key_to_cpu(path->nodes[level], key,
2815 path->slots[level] + 1);
2821 char* btrfs_group_type_str(u64 flag)
2823 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2824 BTRFS_SPACE_INFO_GLOBAL_RSV;
2826 switch (flag & mask) {
2827 case BTRFS_BLOCK_GROUP_DATA:
2829 case BTRFS_BLOCK_GROUP_SYSTEM:
2831 case BTRFS_BLOCK_GROUP_METADATA:
2833 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2834 return "Data+Metadata";
2835 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2836 return "GlobalReserve";
2842 char* btrfs_group_profile_str(u64 flag)
2844 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2847 case BTRFS_BLOCK_GROUP_RAID0:
2849 case BTRFS_BLOCK_GROUP_RAID1:
2851 case BTRFS_BLOCK_GROUP_RAID5:
2853 case BTRFS_BLOCK_GROUP_RAID6:
2855 case BTRFS_BLOCK_GROUP_DUP:
2857 case BTRFS_BLOCK_GROUP_RAID10:
2864 u64 disk_size(char *path)
2868 if (statfs(path, &sfs) < 0)
2871 return sfs.f_bsize * sfs.f_blocks;
2874 u64 get_partition_size(char *dev)
2877 int fd = open(dev, O_RDONLY);
2881 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2890 int btrfs_tree_search2_ioctl_supported(int fd)
2892 struct btrfs_ioctl_search_args_v2 *args2;
2893 struct btrfs_ioctl_search_key *sk;
2894 int args2_size = 1024;
2895 char args2_buf[args2_size];
2897 static int v2_supported = -1;
2899 if (v2_supported != -1)
2900 return v2_supported;
2902 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2906 * Search for the extent tree item in the root tree.
2908 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2909 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2910 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2911 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2912 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2914 sk->max_offset = (u64)-1;
2915 sk->min_transid = 0;
2916 sk->max_transid = (u64)-1;
2918 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2919 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2920 if (ret == -EOPNOTSUPP)
2927 return v2_supported;
2930 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
2932 if (nodesize < sectorsize) {
2934 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2935 nodesize, sectorsize);
2937 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2939 "ERROR: Illegal nodesize %u (larger than %u)\n",
2940 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2942 } else if (nodesize & (sectorsize - 1)) {
2944 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2945 nodesize, sectorsize);
2947 } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
2948 nodesize != sectorsize) {
2950 "ERROR: Illegal nodesize %u (not equal to %u for mixed block group)\n",
2951 nodesize, sectorsize);
2958 * Copy a path argument from SRC to DEST and check the SRC length if it's at
2959 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
2961 * The destination buffer is zero terminated.
2962 * Return < 0 for error, 0 otherwise.
2964 int arg_copy_path(char *dest, const char *src, int destlen)
2966 size_t len = strlen(src);
2968 if (len >= PATH_MAX || len >= destlen)
2969 return -ENAMETOOLONG;
2971 __strncpy__null(dest, src, destlen);
2976 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
2978 unsigned int unit_mode = UNITS_DEFAULT;
2982 for (arg_i = 0; arg_i < *argc; arg_i++) {
2983 if (!strcmp(argv[arg_i], "--raw")) {
2984 unit_mode = UNITS_RAW;
2988 if (!strcmp(argv[arg_i], "--human-readable")) {
2989 unit_mode = UNITS_HUMAN_BINARY;
2994 if (!strcmp(argv[arg_i], "--iec")) {
2995 units_set_mode(&unit_mode, UNITS_BINARY);
2999 if (!strcmp(argv[arg_i], "--si")) {
3000 units_set_mode(&unit_mode, UNITS_DECIMAL);
3005 if (!strcmp(argv[arg_i], "--kbytes")) {
3006 units_set_base(&unit_mode, UNITS_KBYTES);
3010 if (!strcmp(argv[arg_i], "--mbytes")) {
3011 units_set_base(&unit_mode, UNITS_MBYTES);
3015 if (!strcmp(argv[arg_i], "--gbytes")) {
3016 units_set_base(&unit_mode, UNITS_GBYTES);
3020 if (!strcmp(argv[arg_i], "--tbytes")) {
3021 units_set_base(&unit_mode, UNITS_TBYTES);
3029 if (!strcmp(argv[arg_i], "-b")) {
3030 unit_mode = UNITS_RAW;
3034 if (!strcmp(argv[arg_i], "-h")) {
3035 unit_mode = UNITS_HUMAN_BINARY;
3039 if (!strcmp(argv[arg_i], "-H")) {
3040 unit_mode = UNITS_HUMAN_DECIMAL;
3044 if (!strcmp(argv[arg_i], "-k")) {
3045 units_set_base(&unit_mode, UNITS_KBYTES);
3049 if (!strcmp(argv[arg_i], "-m")) {
3050 units_set_base(&unit_mode, UNITS_MBYTES);
3054 if (!strcmp(argv[arg_i], "-g")) {
3055 units_set_base(&unit_mode, UNITS_GBYTES);
3059 if (!strcmp(argv[arg_i], "-t")) {
3060 units_set_base(&unit_mode, UNITS_TBYTES);
3066 for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
3069 argv[arg_end] = argv[arg_i];
3078 int string_is_numerical(const char *str)
3080 if (!(*str >= '0' && *str <= '9'))
3082 while (*str >= '0' && *str <= '9')