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;
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 buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
211 first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
212 first_free &= ~((u64)cfg->sectorsize - 1);
214 memset(&super, 0, sizeof(super));
216 num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
217 if (cfg->fs_uuid && *cfg->fs_uuid) {
218 if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
219 fprintf(stderr, "could not parse UUID: %s\n",
224 if (!test_uuid_unique(cfg->fs_uuid)) {
225 fprintf(stderr, "non-unique UUID: %s\n", cfg->fs_uuid);
230 uuid_generate(super.fsid);
232 uuid_unparse(super.fsid, cfg->fs_uuid);
234 uuid_generate(super.dev_item.uuid);
235 uuid_generate(chunk_tree_uuid);
237 btrfs_set_super_bytenr(&super, cfg->blocks[0]);
238 btrfs_set_super_num_devices(&super, 1);
239 btrfs_set_super_magic(&super, BTRFS_MAGIC);
240 btrfs_set_super_generation(&super, 1);
241 btrfs_set_super_root(&super, cfg->blocks[1]);
242 btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
243 btrfs_set_super_total_bytes(&super, num_bytes);
244 btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
245 btrfs_set_super_sectorsize(&super, cfg->sectorsize);
246 btrfs_set_super_leafsize(&super, cfg->nodesize);
247 btrfs_set_super_nodesize(&super, cfg->nodesize);
248 btrfs_set_super_stripesize(&super, cfg->stripesize);
249 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
250 btrfs_set_super_chunk_root_generation(&super, 1);
251 btrfs_set_super_cache_generation(&super, -1);
252 btrfs_set_super_incompat_flags(&super, cfg->features);
254 strncpy(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
256 /* create the tree of root objects */
257 memset(buf->data, 0, cfg->nodesize);
258 buf->len = cfg->nodesize;
259 btrfs_set_header_bytenr(buf, cfg->blocks[1]);
260 btrfs_set_header_nritems(buf, 4);
261 btrfs_set_header_generation(buf, 1);
262 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
263 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
264 write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
267 write_extent_buffer(buf, chunk_tree_uuid,
268 btrfs_header_chunk_tree_uuid(buf),
271 /* create the items for the root tree */
272 memset(&root_item, 0, sizeof(root_item));
273 inode_item = &root_item.inode;
274 btrfs_set_stack_inode_generation(inode_item, 1);
275 btrfs_set_stack_inode_size(inode_item, 3);
276 btrfs_set_stack_inode_nlink(inode_item, 1);
277 btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
278 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
279 btrfs_set_root_refs(&root_item, 1);
280 btrfs_set_root_used(&root_item, cfg->nodesize);
281 btrfs_set_root_generation(&root_item, 1);
283 memset(&disk_key, 0, sizeof(disk_key));
284 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
285 btrfs_set_disk_key_offset(&disk_key, 0);
288 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
289 btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
290 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
291 btrfs_set_item_key(buf, &disk_key, nritems);
292 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
293 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
295 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
296 nritems), sizeof(root_item));
299 itemoff = itemoff - sizeof(root_item);
300 btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
301 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
302 btrfs_set_item_key(buf, &disk_key, nritems);
303 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
304 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
306 write_extent_buffer(buf, &root_item,
307 btrfs_item_ptr_offset(buf, nritems),
311 itemoff = itemoff - sizeof(root_item);
312 btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
313 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
314 btrfs_set_item_key(buf, &disk_key, nritems);
315 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
316 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
318 write_extent_buffer(buf, &root_item,
319 btrfs_item_ptr_offset(buf, nritems),
323 itemoff = itemoff - sizeof(root_item);
324 btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
325 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
326 btrfs_set_item_key(buf, &disk_key, nritems);
327 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
328 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
330 write_extent_buffer(buf, &root_item,
331 btrfs_item_ptr_offset(buf, nritems),
336 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
337 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
338 if (ret != cfg->nodesize) {
339 ret = (ret < 0 ? -errno : -EIO);
343 /* create the items for the extent tree */
344 memset(buf->data + sizeof(struct btrfs_header), 0,
345 cfg->nodesize - sizeof(struct btrfs_header));
347 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
348 for (i = 1; i < 7; i++) {
349 item_size = sizeof(struct btrfs_extent_item);
350 if (!skinny_metadata)
351 item_size += sizeof(struct btrfs_tree_block_info);
353 BUG_ON(cfg->blocks[i] < first_free);
354 BUG_ON(cfg->blocks[i] < cfg->blocks[i - 1]);
356 /* create extent item */
357 itemoff -= item_size;
358 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
359 if (skinny_metadata) {
360 btrfs_set_disk_key_type(&disk_key,
361 BTRFS_METADATA_ITEM_KEY);
362 btrfs_set_disk_key_offset(&disk_key, 0);
364 btrfs_set_disk_key_type(&disk_key,
365 BTRFS_EXTENT_ITEM_KEY);
366 btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
368 btrfs_set_item_key(buf, &disk_key, nritems);
369 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
371 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
373 extent_item = btrfs_item_ptr(buf, nritems,
374 struct btrfs_extent_item);
375 btrfs_set_extent_refs(buf, extent_item, 1);
376 btrfs_set_extent_generation(buf, extent_item, 1);
377 btrfs_set_extent_flags(buf, extent_item,
378 BTRFS_EXTENT_FLAG_TREE_BLOCK);
381 /* create extent ref */
382 ref_root = reference_root_table[i];
383 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
384 btrfs_set_disk_key_offset(&disk_key, ref_root);
385 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
386 btrfs_set_item_key(buf, &disk_key, nritems);
387 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
389 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
392 btrfs_set_header_bytenr(buf, cfg->blocks[2]);
393 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
394 btrfs_set_header_nritems(buf, nritems);
395 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
396 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
397 if (ret != cfg->nodesize) {
398 ret = (ret < 0 ? -errno : -EIO);
402 /* create the chunk tree */
403 memset(buf->data + sizeof(struct btrfs_header), 0,
404 cfg->nodesize - sizeof(struct btrfs_header));
406 item_size = sizeof(*dev_item);
407 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
409 /* first device 1 (there is no device 0) */
410 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
411 btrfs_set_disk_key_offset(&disk_key, 1);
412 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
413 btrfs_set_item_key(buf, &disk_key, nritems);
414 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
415 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
417 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
418 btrfs_set_device_id(buf, dev_item, 1);
419 btrfs_set_device_generation(buf, dev_item, 0);
420 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
421 btrfs_set_device_bytes_used(buf, dev_item,
422 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
423 btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
424 btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
425 btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
426 btrfs_set_device_type(buf, dev_item, 0);
428 write_extent_buffer(buf, super.dev_item.uuid,
429 (unsigned long)btrfs_device_uuid(dev_item),
431 write_extent_buffer(buf, super.fsid,
432 (unsigned long)btrfs_device_fsid(dev_item),
434 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
438 item_size = btrfs_chunk_item_size(1);
439 itemoff = itemoff - item_size;
441 /* then we have chunk 0 */
442 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
443 btrfs_set_disk_key_offset(&disk_key, 0);
444 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
445 btrfs_set_item_key(buf, &disk_key, nritems);
446 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
447 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
449 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
450 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
451 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
452 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
453 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
454 btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
455 btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
456 btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
457 btrfs_set_chunk_num_stripes(buf, chunk, 1);
458 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
459 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
462 write_extent_buffer(buf, super.dev_item.uuid,
463 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
466 /* copy the key for the chunk to the system array */
467 ptr = super.sys_chunk_array;
468 array_size = sizeof(disk_key);
470 memcpy(ptr, &disk_key, sizeof(disk_key));
471 ptr += sizeof(disk_key);
473 /* copy the chunk to the system array */
474 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
475 array_size += item_size;
477 btrfs_set_super_sys_array_size(&super, array_size);
479 btrfs_set_header_bytenr(buf, cfg->blocks[3]);
480 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
481 btrfs_set_header_nritems(buf, nritems);
482 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
483 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
484 if (ret != cfg->nodesize) {
485 ret = (ret < 0 ? -errno : -EIO);
489 /* create the device tree */
490 memset(buf->data + sizeof(struct btrfs_header), 0,
491 cfg->nodesize - sizeof(struct btrfs_header));
493 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
494 sizeof(struct btrfs_dev_extent);
496 btrfs_set_disk_key_objectid(&disk_key, 1);
497 btrfs_set_disk_key_offset(&disk_key, 0);
498 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
499 btrfs_set_item_key(buf, &disk_key, nritems);
500 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
501 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
502 sizeof(struct btrfs_dev_extent));
503 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
504 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
505 BTRFS_CHUNK_TREE_OBJECTID);
506 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
507 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
508 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
510 write_extent_buffer(buf, chunk_tree_uuid,
511 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
514 btrfs_set_dev_extent_length(buf, dev_extent,
515 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
518 btrfs_set_header_bytenr(buf, cfg->blocks[4]);
519 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
520 btrfs_set_header_nritems(buf, nritems);
521 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
522 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
523 if (ret != cfg->nodesize) {
524 ret = (ret < 0 ? -errno : -EIO);
528 /* create the FS root */
529 memset(buf->data + sizeof(struct btrfs_header), 0,
530 cfg->nodesize - sizeof(struct btrfs_header));
531 btrfs_set_header_bytenr(buf, cfg->blocks[5]);
532 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
533 btrfs_set_header_nritems(buf, 0);
534 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
535 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
536 if (ret != cfg->nodesize) {
537 ret = (ret < 0 ? -errno : -EIO);
540 /* finally create the csum root */
541 memset(buf->data + sizeof(struct btrfs_header), 0,
542 cfg->nodesize - sizeof(struct btrfs_header));
543 btrfs_set_header_bytenr(buf, cfg->blocks[6]);
544 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
545 btrfs_set_header_nritems(buf, 0);
546 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
547 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
548 if (ret != cfg->nodesize) {
549 ret = (ret < 0 ? -errno : -EIO);
553 /* and write out the super block */
554 BUG_ON(sizeof(super) > cfg->sectorsize);
555 memset(buf->data, 0, cfg->sectorsize);
556 memcpy(buf->data, &super, sizeof(super));
557 buf->len = cfg->sectorsize;
558 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
559 ret = pwrite(fd, buf->data, cfg->sectorsize, cfg->blocks[0]);
560 if (ret != cfg->sectorsize) {
561 ret = (ret < 0 ? -errno : -EIO);
572 static const struct btrfs_fs_feature {
576 } mkfs_features[] = {
577 { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
578 "mixed data and metadata block groups" },
579 { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
580 "increased hardlink limit per file to 65536" },
581 { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
582 "raid56 extended format" },
583 { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
584 "reduced-size metadata extent refs" },
585 { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
586 "no explicit hole extents for files" },
587 /* Keep this one last */
588 { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
591 static int parse_one_fs_feature(const char *name, u64 *flags)
596 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
597 if (name[0] == '^' &&
598 !strcmp(mkfs_features[i].name, name + 1)) {
599 *flags &= ~ mkfs_features[i].flag;
601 } else if (!strcmp(mkfs_features[i].name, name)) {
602 *flags |= mkfs_features[i].flag;
610 void btrfs_parse_features_to_string(char *buf, u64 flags)
616 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
617 if (flags & mkfs_features[i].flag) {
620 strcat(buf, mkfs_features[i].name);
625 void btrfs_process_fs_features(u64 flags)
629 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
630 if (flags & mkfs_features[i].flag) {
631 printf("Turning ON incompat feature '%s': %s\n",
632 mkfs_features[i].name,
633 mkfs_features[i].desc);
638 void btrfs_list_all_fs_features(u64 mask_disallowed)
642 fprintf(stderr, "Filesystem features available:\n");
643 for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
644 char *is_default = "";
646 if (mkfs_features[i].flag & mask_disallowed)
648 if (mkfs_features[i].flag & BTRFS_MKFS_DEFAULT_FEATURES)
649 is_default = ", default";
650 fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
651 mkfs_features[i].name,
652 mkfs_features[i].desc,
653 mkfs_features[i].flag,
659 * Return NULL if all features were parsed fine, otherwise return the name of
660 * the first unparsed.
662 char* btrfs_parse_fs_features(char *namelist, u64 *flags)
665 char *save_ptr = NULL; /* Satisfy static checkers */
667 for (this_char = strtok_r(namelist, ",", &save_ptr);
669 this_char = strtok_r(NULL, ",", &save_ptr)) {
670 if (parse_one_fs_feature(this_char, flags))
677 u64 btrfs_device_size(int fd, struct stat *st)
680 if (S_ISREG(st->st_mode)) {
683 if (!S_ISBLK(st->st_mode)) {
686 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
692 static int zero_blocks(int fd, off_t start, size_t len)
694 char *buf = malloc(len);
701 written = pwrite(fd, buf, len, start);
708 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
710 /* don't write outside the device by clamping the region to the device size */
711 static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
713 off_t end = max(start, start + len);
716 /* and don't overwrite the disk labels on sparc */
717 start = max(start, 1024);
718 end = max(end, 1024);
721 start = min_t(u64, start, dev_size);
722 end = min_t(u64, end, dev_size);
724 return zero_blocks(fd, start, end - start);
727 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
728 struct btrfs_root *root, int fd, char *path,
729 u64 device_total_bytes, u32 io_width, u32 io_align,
732 struct btrfs_super_block *disk_super;
733 struct btrfs_super_block *super = root->fs_info->super_copy;
734 struct btrfs_device *device;
735 struct btrfs_dev_item *dev_item;
741 device_total_bytes = (device_total_bytes / sectorsize) * sectorsize;
743 device = kzalloc(sizeof(*device), GFP_NOFS);
746 buf = kzalloc(sectorsize, GFP_NOFS);
749 BUG_ON(sizeof(*disk_super) > sectorsize);
751 disk_super = (struct btrfs_super_block *)buf;
752 dev_item = &disk_super->dev_item;
754 uuid_generate(device->uuid);
757 device->io_width = io_width;
758 device->io_align = io_align;
759 device->sector_size = sectorsize;
761 device->writeable = 1;
762 device->total_bytes = device_total_bytes;
763 device->bytes_used = 0;
764 device->total_ios = 0;
765 device->dev_root = root->fs_info->dev_root;
766 device->name = strdup(path);
770 INIT_LIST_HEAD(&device->dev_list);
771 ret = btrfs_add_device(trans, root, device);
774 fs_total_bytes = btrfs_super_total_bytes(super) + device_total_bytes;
775 btrfs_set_super_total_bytes(super, fs_total_bytes);
777 num_devs = btrfs_super_num_devices(super) + 1;
778 btrfs_set_super_num_devices(super, num_devs);
780 memcpy(disk_super, super, sizeof(*disk_super));
782 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
783 btrfs_set_stack_device_id(dev_item, device->devid);
784 btrfs_set_stack_device_type(dev_item, device->type);
785 btrfs_set_stack_device_io_align(dev_item, device->io_align);
786 btrfs_set_stack_device_io_width(dev_item, device->io_width);
787 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
788 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
789 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
790 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
792 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
793 BUG_ON(ret != sectorsize);
796 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
797 device->fs_devices = root->fs_info->fs_devices;
806 static int btrfs_wipe_existing_sb(int fd)
808 const char *off = NULL;
813 blkid_probe pr = NULL;
815 pr = blkid_new_probe();
819 if (blkid_probe_set_device(pr, fd, 0, 0)) {
824 ret = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
826 ret = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
828 if (ret || len == 0 || off == NULL) {
830 * If lookup fails, the probe did not find any values, eg. for
831 * a file image or a loop device. Soft error.
837 offset = strtoll(off, NULL, 10);
838 if (len > sizeof(buf))
842 ret = pwrite(fd, buf, len, offset);
844 fprintf(stderr, "ERROR: cannot wipe existing superblock\n");
850 blkid_free_probe(pr);
854 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
855 u64 max_block_count, int discard)
861 ret = fstat(fd, &st);
863 fprintf(stderr, "unable to stat %s\n", file);
867 block_count = btrfs_device_size(fd, &st);
868 if (block_count == 0) {
869 fprintf(stderr, "unable to find %s size\n", file);
873 block_count = min(block_count, max_block_count);
877 * We intentionally ignore errors from the discard ioctl. It
878 * is not necessary for the mkfs functionality but just an
881 if (discard_range(fd, 0, 0) == 0) {
882 printf("Performing full device TRIM (%s) ...\n",
883 pretty_size(block_count));
884 discard_blocks(fd, 0, block_count);
888 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
889 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
890 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
891 BTRFS_SUPER_INFO_SIZE, block_count);
892 if (!ret && zero_end)
893 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
894 ZERO_DEV_BYTES, block_count);
897 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
898 file, strerror(-ret));
902 ret = btrfs_wipe_existing_sb(fd);
904 fprintf(stderr, "ERROR: cannot wipe superblocks on '%s'\n",
909 *block_count_ret = block_count;
913 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
914 struct btrfs_root *root, u64 objectid)
917 struct btrfs_inode_item inode_item;
918 time_t now = time(NULL);
920 memset(&inode_item, 0, sizeof(inode_item));
921 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
922 btrfs_set_stack_inode_size(&inode_item, 0);
923 btrfs_set_stack_inode_nlink(&inode_item, 1);
924 btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
925 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
926 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
927 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
928 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
929 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
930 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
931 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
932 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
933 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
935 if (root->fs_info->tree_root == root)
936 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
938 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
942 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
946 btrfs_set_root_dirid(&root->root_item, objectid);
953 * checks if a path is a block device node
954 * Returns negative errno on failure, otherwise
955 * returns 1 for blockdev, 0 for not-blockdev
957 int is_block_device(const char *path)
961 if (stat(path, &statbuf) < 0)
964 return !!S_ISBLK(statbuf.st_mode);
968 * check if given path is a mount point
969 * return 1 if yes. 0 if no. -1 for error
971 int is_mount_point(const char *path)
977 f = setmntent("/proc/self/mounts", "r");
981 while ((mnt = getmntent(f)) != NULL) {
982 if (strcmp(mnt->mnt_dir, path))
991 static int is_reg_file(const char *path)
995 if (stat(path, &statbuf) < 0)
997 return S_ISREG(statbuf.st_mode);
1001 * This function checks if the given input parameter is
1003 * return <0 : some error in the given input
1004 * return BTRFS_ARG_UNKNOWN: unknown input
1005 * return BTRFS_ARG_UUID: given input is uuid
1006 * return BTRFS_ARG_MNTPOINT: given input is path
1007 * return BTRFS_ARG_REG: given input is regular file
1009 int check_arg_type(const char *input)
1012 char path[PATH_MAX];
1017 if (realpath(input, path)) {
1018 if (is_block_device(path) == 1)
1019 return BTRFS_ARG_BLKDEV;
1021 if (is_mount_point(path) == 1)
1022 return BTRFS_ARG_MNTPOINT;
1024 if (is_reg_file(path))
1025 return BTRFS_ARG_REG;
1027 return BTRFS_ARG_UNKNOWN;
1030 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
1031 !uuid_parse(input, uuid))
1032 return BTRFS_ARG_UUID;
1034 return BTRFS_ARG_UNKNOWN;
1038 * Find the mount point for a mounted device.
1039 * On success, returns 0 with mountpoint in *mp.
1040 * On failure, returns -errno (not mounted yields -EINVAL)
1041 * Is noisy on failures, expects to be given a mounted device.
1043 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
1048 ret = is_block_device(dev);
1051 fprintf(stderr, "%s is not a block device\n", dev);
1054 fprintf(stderr, "Could not check %s: %s\n",
1055 dev, strerror(-ret));
1060 fd = open(dev, O_RDONLY);
1063 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
1067 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
1070 } else { /* mounted, all good */
1080 * Given a pathname, return a filehandle to:
1081 * the original pathname or,
1082 * if the pathname is a mounted btrfs device, to its mountpoint.
1084 * On error, return -1, errno should be set.
1086 int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
1091 if (is_block_device(path)) {
1092 ret = get_btrfs_mount(path, mp, sizeof(mp));
1094 /* not a mounted btrfs dev */
1095 error_on(verbose, "'%s' is not a mounted btrfs device",
1100 ret = open_file_or_dir(mp, dirstream);
1101 error_on(verbose && ret < 0, "can't access '%s': %s",
1102 path, strerror(errno));
1104 ret = btrfs_open_dir(path, dirstream, 1);
1111 * Do the following checks before calling open_file_or_dir():
1112 * 1: path is in a btrfs filesystem
1113 * 2: path is a directory
1115 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
1121 if (statfs(path, &stfs) != 0) {
1124 "ERROR: can't access '%s': %s\n",
1125 path, strerror(errno));
1129 if (stfs.f_type != BTRFS_SUPER_MAGIC) {
1132 "ERROR: not a btrfs filesystem: %s\n",
1137 if (stat(path, &st) != 0) {
1140 "ERROR: can't access '%s': %s\n",
1141 path, strerror(errno));
1145 if (!S_ISDIR(st.st_mode)) {
1148 "ERROR: not a directory: %s\n",
1153 ret = open_file_or_dir(path, dirstream);
1157 "ERROR: can't access '%s': %s\n",
1158 path, strerror(errno));
1164 /* checks if a device is a loop device */
1165 static int is_loop_device (const char* device) {
1166 struct stat statbuf;
1168 if(stat(device, &statbuf) < 0)
1171 return (S_ISBLK(statbuf.st_mode) &&
1172 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
1176 /* Takes a loop device path (e.g. /dev/loop0) and returns
1177 * the associated file (e.g. /images/my_btrfs.img) */
1178 static int resolve_loop_device(const char* loop_dev, char* loop_file,
1185 char real_loop_dev[PATH_MAX];
1187 if (!realpath(loop_dev, real_loop_dev))
1189 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
1190 if (!(f = fopen(p, "r")))
1193 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
1194 ret = fscanf(f, fmt, loop_file);
1203 * Checks whether a and b are identical or device
1204 * files associated with the same block device
1206 static int is_same_blk_file(const char* a, const char* b)
1208 struct stat st_buf_a, st_buf_b;
1209 char real_a[PATH_MAX];
1210 char real_b[PATH_MAX];
1212 if (!realpath(a, real_a))
1213 strncpy_null(real_a, a);
1215 if (!realpath(b, real_b))
1216 strncpy_null(real_b, b);
1218 /* Identical path? */
1219 if (strcmp(real_a, real_b) == 0)
1222 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
1223 if (errno == ENOENT)
1228 /* Same blockdevice? */
1229 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
1230 st_buf_a.st_rdev == st_buf_b.st_rdev) {
1235 if (st_buf_a.st_dev == st_buf_b.st_dev &&
1236 st_buf_a.st_ino == st_buf_b.st_ino) {
1243 /* checks if a and b are identical or device
1244 * files associated with the same block device or
1245 * if one file is a loop device that uses the other
1248 static int is_same_loop_file(const char* a, const char* b)
1250 char res_a[PATH_MAX];
1251 char res_b[PATH_MAX];
1252 const char* final_a = NULL;
1253 const char* final_b = NULL;
1256 /* Resolve a if it is a loop device */
1257 if((ret = is_loop_device(a)) < 0) {
1262 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1273 /* Resolve b if it is a loop device */
1274 if ((ret = is_loop_device(b)) < 0) {
1279 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1290 return is_same_blk_file(final_a, final_b);
1293 /* Checks if a file exists and is a block or regular file*/
1294 static int is_existing_blk_or_reg_file(const char* filename)
1298 if(stat(filename, &st_buf) < 0) {
1305 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1308 /* Checks if a file is used (directly or indirectly via a loop device)
1309 * by a device in fs_devices
1311 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1315 struct list_head *head;
1316 struct list_head *cur;
1317 struct btrfs_device *device;
1319 head = &fs_devices->devices;
1320 list_for_each(cur, head) {
1321 device = list_entry(cur, struct btrfs_device, dev_list);
1323 if((ret = is_same_loop_file(device->name, file)))
1331 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1332 * Returns NULL on invalid input or malloc failure; Other failures
1333 * will be handled by the caller using the input pathame.
1335 char *canonicalize_dm_name(const char *ptname)
1339 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1341 if (!ptname || !*ptname)
1344 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1345 if (!(f = fopen(path, "r")))
1348 /* read <name>\n from sysfs */
1349 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1350 name[sz - 1] = '\0';
1351 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1353 if (access(path, F_OK) == 0)
1361 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1362 * to a device mapper pathname.
1363 * Returns NULL on invalid input or malloc failure; Other failures
1364 * will be handled by the caller using the input pathame.
1366 char *canonicalize_path(const char *path)
1368 char *canonical, *p;
1370 if (!path || !*path)
1373 canonical = realpath(path, NULL);
1375 return strdup(path);
1376 p = strrchr(canonical, '/');
1377 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1378 char *dm = canonicalize_dm_name(p + 1);
1389 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1390 * is safe to continue.
1392 int check_mounted(const char* file)
1397 fd = open(file, O_RDONLY);
1399 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1403 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1409 int check_mounted_where(int fd, const char *file, char *where, int size,
1410 struct btrfs_fs_devices **fs_dev_ret)
1415 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1419 /* scan the initial device */
1420 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1421 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1422 is_btrfs = (ret >= 0);
1424 /* scan other devices */
1425 if (is_btrfs && total_devs > 1) {
1426 ret = btrfs_scan_lblkid();
1431 /* iterate over the list of currently mountes filesystems */
1432 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1435 while ((mnt = getmntent (f)) != NULL) {
1437 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1440 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1442 /* ignore entries in the mount table that are not
1443 associated with a file*/
1444 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1445 goto out_mntloop_err;
1449 ret = is_same_loop_file(file, mnt->mnt_fsname);
1453 goto out_mntloop_err;
1458 /* Did we find an entry in mnt table? */
1459 if (mnt && size && where) {
1460 strncpy(where, mnt->mnt_dir, size);
1464 *fs_dev_ret = fs_devices_mnt;
1466 ret = (mnt != NULL);
1474 struct pending_dir {
1475 struct list_head list;
1476 char name[PATH_MAX];
1479 int btrfs_register_one_device(const char *fname)
1481 struct btrfs_ioctl_vol_args args;
1486 fd = open("/dev/btrfs-control", O_RDWR);
1488 fprintf(stderr, "failed to open /dev/btrfs-control "
1489 "skipping device registration: %s\n",
1493 memset(&args, 0, sizeof(args));
1494 strncpy_null(args.name, fname);
1495 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1498 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1499 fname, strerror(e));
1507 * Register all devices in the fs_uuid list created in the user
1508 * space. Ensure btrfs_scan_lblkid() is called before this func.
1510 int btrfs_register_all_devices(void)
1513 struct btrfs_fs_devices *fs_devices;
1514 struct btrfs_device *device;
1515 struct list_head *all_uuids;
1517 all_uuids = btrfs_scanned_uuids();
1519 list_for_each_entry(fs_devices, all_uuids, list) {
1520 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1521 if (*device->name) {
1522 err = btrfs_register_one_device(device->name);
1533 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1536 struct btrfs_super_block *disk_super;
1540 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1545 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1546 if (ret != BTRFS_SUPER_INFO_SIZE)
1550 disk_super = (struct btrfs_super_block *)buf;
1551 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1554 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1564 * Note: this function uses a static per-thread buffer. Do not call this
1565 * function more than 10 times within one argument list!
1567 const char *pretty_size_mode(u64 size, unsigned mode)
1569 static __thread int ps_index = 0;
1570 static __thread char ps_array[10][32];
1573 ret = ps_array[ps_index];
1576 (void)pretty_size_snprintf(size, ret, 32, mode);
1581 static const char* unit_suffix_binary[] =
1582 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1583 static const char* unit_suffix_decimal[] =
1584 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1586 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1592 const char** suffix = NULL;
1598 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1599 snprintf(str, str_size, "%llu", size);
1603 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1606 suffix = unit_suffix_binary;
1607 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1610 suffix = unit_suffix_decimal;
1615 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1623 switch (unit_mode & UNITS_MODE_MASK) {
1624 case UNITS_TBYTES: base *= mult; num_divs++;
1625 case UNITS_GBYTES: base *= mult; num_divs++;
1626 case UNITS_MBYTES: base *= mult; num_divs++;
1627 case UNITS_KBYTES: num_divs++;
1634 while (size >= mult) {
1641 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1643 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1648 fraction = (float)last_size / base;
1650 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1654 * __strncpy__null - strncpy with null termination
1655 * @dest: the target array
1656 * @src: the source string
1657 * @n: maximum bytes to copy (size of *dest)
1659 * Like strncpy, but ensures destination is null-terminated.
1661 * Copies the string pointed to by src, including the terminating null
1662 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1663 * of n bytes. Then ensure that dest is null-terminated.
1665 char *__strncpy__null(char *dest, const char *src, size_t n)
1667 strncpy(dest, src, n);
1674 * Checks to make sure that the label matches our requirements.
1676 0 if everything is safe and usable
1677 -1 if the label is too long
1679 static int check_label(const char *input)
1681 int len = strlen(input);
1683 if (len > BTRFS_LABEL_SIZE - 1) {
1684 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1685 input, BTRFS_LABEL_SIZE - 1);
1692 static int set_label_unmounted(const char *dev, const char *label)
1694 struct btrfs_trans_handle *trans;
1695 struct btrfs_root *root;
1698 ret = check_mounted(dev);
1700 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1704 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1709 /* Open the super_block at the default location
1710 * and as read-write.
1712 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1713 if (!root) /* errors are printed by open_ctree() */
1716 trans = btrfs_start_transaction(root, 1);
1717 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1719 btrfs_commit_transaction(trans, root);
1721 /* Now we close it since we are done. */
1726 static int set_label_mounted(const char *mount_path, const char *label)
1730 fd = open(mount_path, O_RDONLY | O_NOATIME);
1732 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1736 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1737 fprintf(stderr, "ERROR: unable to set label %s\n",
1747 int get_label_unmounted(const char *dev, char *label)
1749 struct btrfs_root *root;
1752 ret = check_mounted(dev);
1754 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1758 /* Open the super_block at the default location
1761 root = open_ctree(dev, 0, 0);
1765 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1767 /* Now we close it since we are done. */
1773 * If a partition is mounted, try to get the filesystem label via its
1774 * mounted path rather than device. Return the corresponding error
1775 * the user specified the device path.
1777 int get_label_mounted(const char *mount_path, char *labelp)
1779 char label[BTRFS_LABEL_SIZE];
1783 fd = open(mount_path, O_RDONLY | O_NOATIME);
1785 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1789 memset(label, '\0', sizeof(label));
1790 ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
1792 if (errno != ENOTTY)
1793 fprintf(stderr, "ERROR: unable to get label %s\n",
1800 strncpy(labelp, label, sizeof(label));
1805 int get_label(const char *btrfs_dev, char *label)
1809 ret = is_existing_blk_or_reg_file(btrfs_dev);
1811 ret = get_label_mounted(btrfs_dev, label);
1813 ret = get_label_unmounted(btrfs_dev, label);
1818 int set_label(const char *btrfs_dev, const char *label)
1822 if (check_label(label))
1825 ret = is_existing_blk_or_reg_file(btrfs_dev);
1827 ret = set_label_mounted(btrfs_dev, label);
1829 ret = set_label_unmounted(btrfs_dev, label);
1835 * Unsafe subvolume check.
1837 * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
1838 * btrfs mount point.
1839 * Must use together with other reliable method like btrfs ioctl.
1841 static int __is_subvol(const char *path)
1846 ret = lstat(path, &st);
1850 return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
1854 * A not-so-good version fls64. No fascinating optimization since
1855 * no one except parse_size use it
1857 static int fls64(u64 x)
1861 for (i = 0; i <64; i++)
1862 if (x << i & (1ULL << 63))
1867 u64 parse_size(char *s)
1875 fprintf(stderr, "ERROR: Size value is empty\n");
1880 "ERROR: Size value '%s' is less equal than 0\n", s);
1883 ret = strtoull(s, &endptr, 10);
1885 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1888 if (endptr[0] && endptr[1]) {
1889 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1894 * strtoll returns LLONG_MAX when overflow, if this happens,
1895 * need to call strtoull to get the real size
1897 if (errno == ERANGE && ret == ULLONG_MAX) {
1899 "ERROR: Size value '%s' is too large for u64\n", s);
1903 c = tolower(endptr[0]);
1926 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1931 /* Check whether ret * mult overflow */
1932 if (fls64(ret) + fls64(mult) - 1 > 64) {
1934 "ERROR: Size value '%s' is too large for u64\n", s);
1941 u64 parse_qgroupid(const char *p)
1943 char *s = strchr(p, '/');
1944 const char *ptr_src_end = p + strlen(p);
1945 char *ptr_parse_end = NULL;
1954 /* Numeric format like '0/257' is the primary case */
1956 id = strtoull(p, &ptr_parse_end, 10);
1957 if (ptr_parse_end != ptr_src_end)
1961 level = strtoull(p, &ptr_parse_end, 10);
1962 if (ptr_parse_end != s)
1965 id = strtoull(s + 1, &ptr_parse_end, 10);
1966 if (ptr_parse_end != ptr_src_end)
1969 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
1972 /* Path format like subv at 'my_subvol' is the fallback case */
1973 ret = __is_subvol(p);
1974 if (ret < 0 || !ret)
1976 fd = open(p, O_RDONLY);
1979 ret = lookup_ino_rootid(fd, &id);
1986 fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
1990 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
1996 ret = stat(fname, &st);
2000 if (S_ISDIR(st.st_mode)) {
2001 *dirstream = opendir(fname);
2004 fd = dirfd(*dirstream);
2005 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
2006 fd = open(fname, open_flags);
2009 * we set this on purpose, in case the caller output
2010 * strerror(errno) as success
2018 closedir(*dirstream);
2025 int open_file_or_dir(const char *fname, DIR **dirstream)
2027 return open_file_or_dir3(fname, dirstream, O_RDWR);
2030 void close_file_or_dir(int fd, DIR *dirstream)
2033 closedir(dirstream);
2038 int get_device_info(int fd, u64 devid,
2039 struct btrfs_ioctl_dev_info_args *di_args)
2043 di_args->devid = devid;
2044 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
2046 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
2047 return ret ? -errno : 0;
2050 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
2053 struct btrfs_dev_item *dev_item;
2054 char *buf = search_args->buf;
2056 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
2057 + sizeof(struct btrfs_dev_item));
2058 buf += sizeof(struct btrfs_ioctl_search_header);
2060 dev_item = (struct btrfs_dev_item *)buf;
2062 return btrfs_stack_device_id(dev_item);
2065 static int search_chunk_tree_for_fs_info(int fd,
2066 struct btrfs_ioctl_fs_info_args *fi_args)
2070 u64 start_devid = 1;
2071 struct btrfs_ioctl_search_args search_args;
2072 struct btrfs_ioctl_search_key *search_key = &search_args.key;
2074 fi_args->num_devices = 0;
2076 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
2077 / (sizeof(struct btrfs_ioctl_search_header)
2078 + sizeof(struct btrfs_dev_item));
2080 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
2081 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2082 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2083 search_key->min_type = BTRFS_DEV_ITEM_KEY;
2084 search_key->max_type = BTRFS_DEV_ITEM_KEY;
2085 search_key->min_transid = 0;
2086 search_key->max_transid = (u64)-1;
2087 search_key->nr_items = max_items;
2088 search_key->max_offset = (u64)-1;
2091 search_key->min_offset = start_devid;
2093 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
2097 fi_args->num_devices += (u64)search_key->nr_items;
2099 if (search_key->nr_items == max_items) {
2100 start_devid = find_max_device_id(&search_args,
2101 search_key->nr_items) + 1;
2105 /* get the lastest max_id to stay consistent with the num_devices */
2106 if (search_key->nr_items == 0)
2108 * last tree_search returns an empty buf, use the devid of
2109 * the last dev_item of the previous tree_search
2111 fi_args->max_id = start_devid - 1;
2113 fi_args->max_id = find_max_device_id(&search_args,
2114 search_key->nr_items);
2120 * For a given path, fill in the ioctl fs_ and info_ args.
2121 * If the path is a btrfs mountpoint, fill info for all devices.
2122 * If the path is a btrfs device, fill in only that device.
2124 * The path provided must be either on a mounted btrfs fs,
2125 * or be a mounted btrfs device.
2127 * Returns 0 on success, or a negative errno.
2129 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
2130 struct btrfs_ioctl_dev_info_args **di_ret)
2137 struct btrfs_fs_devices *fs_devices_mnt = NULL;
2138 struct btrfs_ioctl_dev_info_args *di_args;
2139 struct btrfs_ioctl_dev_info_args tmp;
2141 DIR *dirstream = NULL;
2143 memset(fi_args, 0, sizeof(*fi_args));
2145 if (is_block_device(path) == 1) {
2146 struct btrfs_super_block *disk_super;
2147 char buf[BTRFS_SUPER_INFO_SIZE];
2150 /* Ensure it's mounted, then set path to the mountpoint */
2151 fd = open(path, O_RDONLY);
2154 fprintf(stderr, "Couldn't open %s: %s\n",
2155 path, strerror(errno));
2158 ret = check_mounted_where(fd, path, mp, sizeof(mp),
2167 /* Only fill in this one device */
2168 fi_args->num_devices = 1;
2170 disk_super = (struct btrfs_super_block *)buf;
2171 ret = btrfs_read_dev_super(fd, disk_super,
2172 BTRFS_SUPER_INFO_OFFSET, 0);
2177 devid = btrfs_stack_device_id(&disk_super->dev_item);
2179 fi_args->max_id = devid;
2182 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
2186 /* at this point path must not be for a block device */
2187 fd = open_file_or_dir(path, &dirstream);
2193 /* fill in fi_args if not just a single device */
2194 if (fi_args->num_devices != 1) {
2195 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
2202 * The fs_args->num_devices does not include seed devices
2204 ret = search_chunk_tree_for_fs_info(fd, fi_args);
2209 * search_chunk_tree_for_fs_info() will lacks the devid 0
2210 * so manual probe for it here.
2212 ret = get_device_info(fd, 0, &tmp);
2214 fi_args->num_devices++;
2222 if (!fi_args->num_devices)
2225 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
2232 memcpy(di_args, &tmp, sizeof(tmp));
2233 for (; i <= fi_args->max_id; ++i) {
2234 ret = get_device_info(fd, i, &di_args[ndevs]);
2243 * only when the only dev we wanted to find is not there then
2244 * let any error be returned
2246 if (fi_args->num_devices != 1) {
2252 close_file_or_dir(fd, dirstream);
2256 #define isoctal(c) (((c) & ~7) == '0')
2258 static inline void translate(char *f, char *t)
2260 while (*f != '\0') {
2262 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
2263 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
2273 * Checks if the swap device.
2274 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2276 static int is_swap_device(const char *file)
2287 if (stat(file, &st_buf) < 0)
2289 if (S_ISBLK(st_buf.st_mode))
2290 dev = st_buf.st_rdev;
2291 else if (S_ISREG(st_buf.st_mode)) {
2292 dev = st_buf.st_dev;
2293 ino = st_buf.st_ino;
2297 if ((f = fopen("/proc/swaps", "r")) == NULL)
2300 /* skip the first line */
2301 if (fgets(tmp, sizeof(tmp), f) == NULL)
2304 while (fgets(tmp, sizeof(tmp), f) != NULL) {
2305 if ((cp = strchr(tmp, ' ')) != NULL)
2307 if ((cp = strchr(tmp, '\t')) != NULL)
2309 translate(tmp, buf);
2310 if (stat(buf, &st_buf) != 0)
2312 if (S_ISBLK(st_buf.st_mode)) {
2313 if (dev == st_buf.st_rdev) {
2317 } else if (S_ISREG(st_buf.st_mode)) {
2318 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
2332 * Check for existing filesystem or partition table on device.
2334 * 1 for existing fs or partition
2335 * 0 for nothing found
2336 * -1 for internal error
2343 blkid_probe pr = NULL;
2347 if (!device || !*device)
2350 ret = -1; /* will reset on success of all setup calls */
2352 pr = blkid_new_probe_from_filename(device);
2356 size = blkid_probe_get_size(pr);
2360 /* nothing to overwrite on a 0-length device */
2366 ret = blkid_probe_enable_partitions(pr, 1);
2370 ret = blkid_do_fullprobe(pr);
2375 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2376 * but we want the exact opposite, so reverse the return value here.
2378 * In addition print some useful diagnostics about what actually is
2386 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2388 "%s appears to contain an existing "
2389 "filesystem (%s).\n", device, type);
2390 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2392 "%s appears to contain a partition "
2393 "table (%s).\n", device, type);
2396 "%s appears to contain something weird "
2397 "according to blkid\n", device);
2403 blkid_free_probe(pr);
2406 "probe of %s failed, cannot detect "
2407 "existing filesystem.\n", device);
2411 static int group_profile_devs_min(u64 flag)
2413 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2414 case 0: /* single */
2415 case BTRFS_BLOCK_GROUP_DUP:
2417 case BTRFS_BLOCK_GROUP_RAID0:
2418 case BTRFS_BLOCK_GROUP_RAID1:
2419 case BTRFS_BLOCK_GROUP_RAID5:
2421 case BTRFS_BLOCK_GROUP_RAID6:
2423 case BTRFS_BLOCK_GROUP_RAID10:
2430 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2431 u64 dev_cnt, int mixed)
2438 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2440 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2442 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2443 BTRFS_BLOCK_GROUP_RAID5;
2446 allowed |= BTRFS_BLOCK_GROUP_DUP;
2450 ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
2452 "ERROR: DUP is not allowed when FS has multiple devices\n");
2455 if (metadata_profile & ~allowed) {
2457 "ERROR: unable to create FS with metadata profile %s "
2458 "(have %llu devices but %d devices are required)\n",
2459 btrfs_group_profile_str(metadata_profile), dev_cnt,
2460 group_profile_devs_min(metadata_profile));
2463 if (data_profile & ~allowed) {
2465 "ERROR: unable to create FS with data profile %s "
2466 "(have %llu devices but %d devices are required)\n",
2467 btrfs_group_profile_str(data_profile), dev_cnt,
2468 group_profile_devs_min(data_profile));
2472 if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
2474 "ERROR: DUP for data is allowed only in mixed mode\n");
2480 int group_profile_max_safe_loss(u64 flags)
2482 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2483 case 0: /* single */
2484 case BTRFS_BLOCK_GROUP_DUP:
2485 case BTRFS_BLOCK_GROUP_RAID0:
2487 case BTRFS_BLOCK_GROUP_RAID1:
2488 case BTRFS_BLOCK_GROUP_RAID5:
2489 case BTRFS_BLOCK_GROUP_RAID10:
2491 case BTRFS_BLOCK_GROUP_RAID6:
2499 * Check if a device is suitable for btrfs
2501 * 1: something is wrong, an error is printed
2504 int test_dev_for_mkfs(char *file, int force_overwrite)
2509 ret = is_swap_device(file);
2511 fprintf(stderr, "ERROR: checking status of %s: %s\n", file,
2516 fprintf(stderr, "ERROR: %s is a swap device\n", file);
2519 if (!force_overwrite) {
2520 if (check_overwrite(file)) {
2521 fprintf(stderr, "Use the -f option to force overwrite.\n");
2525 ret = check_mounted(file);
2527 fprintf(stderr, "ERROR: checking mount status of %s: %s\n",
2528 file, strerror(-ret));
2532 fprintf(stderr, "ERROR: %s is mounted\n", file);
2535 /* check if the device is busy */
2536 fd = open(file, O_RDWR|O_EXCL);
2538 fprintf(stderr, "ERROR: unable to open %s: %s\n", file,
2542 if (fstat(fd, &st)) {
2543 fprintf(stderr, "ERROR: unable to stat %s: %s\n", file,
2548 if (!S_ISBLK(st.st_mode)) {
2549 fprintf(stderr, "ERROR: %s is not a block device\n", file);
2557 int btrfs_scan_lblkid(void)
2562 struct btrfs_fs_devices *tmp_devices;
2563 blkid_dev_iterate iter = NULL;
2564 blkid_dev dev = NULL;
2565 blkid_cache cache = NULL;
2566 char path[PATH_MAX];
2568 if (btrfs_scan_done)
2571 if (blkid_get_cache(&cache, 0) < 0) {
2572 printf("ERROR: lblkid cache get failed\n");
2575 blkid_probe_all(cache);
2576 iter = blkid_dev_iterate_begin(cache);
2577 blkid_dev_set_search(iter, "TYPE", "btrfs");
2578 while (blkid_dev_next(iter, &dev) == 0) {
2579 dev = blkid_verify(cache, dev);
2582 /* if we are here its definitely a btrfs disk*/
2583 strncpy_null(path, blkid_dev_devname(dev));
2585 fd = open(path, O_RDONLY);
2587 printf("ERROR: could not open %s\n", path);
2590 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2591 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2593 printf("ERROR: could not scan %s\n", path);
2600 blkid_dev_iterate_end(iter);
2601 blkid_put_cache(cache);
2603 btrfs_scan_done = 1;
2608 int is_vol_small(char *file)
2615 fd = open(file, O_RDONLY);
2618 if (fstat(fd, &st) < 0) {
2623 size = btrfs_device_size(fd, &st);
2628 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2638 * This reads a line from the stdin and only returns non-zero if the
2639 * first whitespace delimited token is a case insensitive match with yes
2642 int ask_user(char *question)
2644 char buf[30] = {0,};
2645 char *saveptr = NULL;
2648 printf("%s [y/N]: ", question);
2650 return fgets(buf, sizeof(buf) - 1, stdin) &&
2651 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2652 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2657 * - file or directory return the containing tree root id
2658 * - subvolume return its own tree id
2659 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2660 * undefined and function returns -1
2662 int lookup_ino_rootid(int fd, u64 *rootid)
2664 struct btrfs_ioctl_ino_lookup_args args;
2668 memset(&args, 0, sizeof(args));
2670 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2672 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2675 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2680 *rootid = args.treeid;
2686 * return 0 if a btrfs mount point is found
2687 * return 1 if a mount point is found but not btrfs
2688 * return <0 if something goes wrong
2690 int find_mount_root(const char *path, char **mount_root)
2698 int longest_matchlen = 0;
2699 char *longest_match = NULL;
2701 fd = open(path, O_RDONLY | O_NOATIME);
2706 mnttab = setmntent("/proc/self/mounts", "r");
2710 while ((ent = getmntent(mnttab))) {
2711 len = strlen(ent->mnt_dir);
2712 if (strncmp(ent->mnt_dir, path, len) == 0) {
2713 /* match found and use the latest match */
2714 if (longest_matchlen <= len) {
2715 free(longest_match);
2716 longest_matchlen = len;
2717 longest_match = strdup(ent->mnt_dir);
2718 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2727 free(longest_match);
2732 *mount_root = realpath(longest_match, NULL);
2736 free(longest_match);
2740 int test_minimum_size(const char *file, u32 nodesize)
2743 struct stat statbuf;
2745 fd = open(file, O_RDONLY);
2748 if (stat(file, &statbuf) < 0) {
2752 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
2761 * test if name is a correct subvolume name
2762 * this function return
2763 * 0-> name is not a correct subvolume name
2764 * 1-> name is a correct subvolume name
2766 int test_issubvolname(const char *name)
2768 return name[0] != '\0' && !strchr(name, '/') &&
2769 strcmp(name, ".") && strcmp(name, "..");
2773 * test if path is a directory
2774 * this function return
2775 * 0-> path exists but it is not a directory
2776 * 1-> path exists and it is a directory
2777 * -1 -> path is unaccessible
2779 int test_isdir(const char *path)
2784 ret = stat(path, &st);
2788 return S_ISDIR(st.st_mode);
2791 void units_set_mode(unsigned *units, unsigned mode)
2793 unsigned base = *units & UNITS_MODE_MASK;
2795 *units = base | mode;
2798 void units_set_base(unsigned *units, unsigned base)
2800 unsigned mode = *units & ~UNITS_MODE_MASK;
2802 *units = base | mode;
2805 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2809 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2810 if (!path->nodes[level])
2812 if (path->slots[level] + 1 >=
2813 btrfs_header_nritems(path->nodes[level]))
2816 btrfs_item_key_to_cpu(path->nodes[level], key,
2817 path->slots[level] + 1);
2819 btrfs_node_key_to_cpu(path->nodes[level], key,
2820 path->slots[level] + 1);
2826 char* btrfs_group_type_str(u64 flag)
2828 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2829 BTRFS_SPACE_INFO_GLOBAL_RSV;
2831 switch (flag & mask) {
2832 case BTRFS_BLOCK_GROUP_DATA:
2834 case BTRFS_BLOCK_GROUP_SYSTEM:
2836 case BTRFS_BLOCK_GROUP_METADATA:
2838 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2839 return "Data+Metadata";
2840 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2841 return "GlobalReserve";
2847 char* btrfs_group_profile_str(u64 flag)
2849 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2852 case BTRFS_BLOCK_GROUP_RAID0:
2854 case BTRFS_BLOCK_GROUP_RAID1:
2856 case BTRFS_BLOCK_GROUP_RAID5:
2858 case BTRFS_BLOCK_GROUP_RAID6:
2860 case BTRFS_BLOCK_GROUP_DUP:
2862 case BTRFS_BLOCK_GROUP_RAID10:
2869 u64 disk_size(char *path)
2873 if (statfs(path, &sfs) < 0)
2876 return sfs.f_bsize * sfs.f_blocks;
2879 u64 get_partition_size(char *dev)
2882 int fd = open(dev, O_RDONLY);
2886 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2895 int btrfs_tree_search2_ioctl_supported(int fd)
2897 struct btrfs_ioctl_search_args_v2 *args2;
2898 struct btrfs_ioctl_search_key *sk;
2899 int args2_size = 1024;
2900 char args2_buf[args2_size];
2902 static int v2_supported = -1;
2904 if (v2_supported != -1)
2905 return v2_supported;
2907 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2911 * Search for the extent tree item in the root tree.
2913 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2914 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2915 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2916 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2917 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2919 sk->max_offset = (u64)-1;
2920 sk->min_transid = 0;
2921 sk->max_transid = (u64)-1;
2923 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2924 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2925 if (ret == -EOPNOTSUPP)
2932 return v2_supported;
2935 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
2937 if (nodesize < sectorsize) {
2939 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2940 nodesize, sectorsize);
2942 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2944 "ERROR: Illegal nodesize %u (larger than %u)\n",
2945 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2947 } else if (nodesize & (sectorsize - 1)) {
2949 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2950 nodesize, sectorsize);
2952 } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
2953 nodesize != sectorsize) {
2955 "ERROR: Illegal nodesize %u (not equal to %u for mixed block group)\n",
2956 nodesize, sectorsize);
2963 * Copy a path argument from SRC to DEST and check the SRC length if it's at
2964 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
2966 * The destination buffer is zero terminated.
2967 * Return < 0 for error, 0 otherwise.
2969 int arg_copy_path(char *dest, const char *src, int destlen)
2971 size_t len = strlen(src);
2973 if (len >= PATH_MAX || len >= destlen)
2974 return -ENAMETOOLONG;
2976 __strncpy__null(dest, src, destlen);
2981 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
2983 unsigned int unit_mode = UNITS_DEFAULT;
2987 for (arg_i = 0; arg_i < *argc; arg_i++) {
2988 if (!strcmp(argv[arg_i], "--raw")) {
2989 unit_mode = UNITS_RAW;
2993 if (!strcmp(argv[arg_i], "--human-readable")) {
2994 unit_mode = UNITS_HUMAN_BINARY;
2999 if (!strcmp(argv[arg_i], "--iec")) {
3000 units_set_mode(&unit_mode, UNITS_BINARY);
3004 if (!strcmp(argv[arg_i], "--si")) {
3005 units_set_mode(&unit_mode, UNITS_DECIMAL);
3010 if (!strcmp(argv[arg_i], "--kbytes")) {
3011 units_set_base(&unit_mode, UNITS_KBYTES);
3015 if (!strcmp(argv[arg_i], "--mbytes")) {
3016 units_set_base(&unit_mode, UNITS_MBYTES);
3020 if (!strcmp(argv[arg_i], "--gbytes")) {
3021 units_set_base(&unit_mode, UNITS_GBYTES);
3025 if (!strcmp(argv[arg_i], "--tbytes")) {
3026 units_set_base(&unit_mode, UNITS_TBYTES);
3034 if (!strcmp(argv[arg_i], "-b")) {
3035 unit_mode = UNITS_RAW;
3039 if (!strcmp(argv[arg_i], "-h")) {
3040 unit_mode = UNITS_HUMAN_BINARY;
3044 if (!strcmp(argv[arg_i], "-H")) {
3045 unit_mode = UNITS_HUMAN_DECIMAL;
3049 if (!strcmp(argv[arg_i], "-k")) {
3050 units_set_base(&unit_mode, UNITS_KBYTES);
3054 if (!strcmp(argv[arg_i], "-m")) {
3055 units_set_base(&unit_mode, UNITS_MBYTES);
3059 if (!strcmp(argv[arg_i], "-g")) {
3060 units_set_base(&unit_mode, UNITS_GBYTES);
3064 if (!strcmp(argv[arg_i], "-t")) {
3065 units_set_base(&unit_mode, UNITS_TBYTES);
3071 for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
3074 argv[arg_end] = argv[arg_i];
3083 int string_is_numerical(const char *str)
3085 if (!(*str >= '0' && *str <= '9'))
3087 while (*str >= '0' && *str <= '9')