btrfs-progs: fi du: add long options for units
[btrfs-progs-unstable/devel.git] / utils.c
blobeabc36dca7a18f18ed83ca9ee660e2a95466baaa
1 /*
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.
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/ioctl.h>
24 #include <sys/mount.h>
25 #include <sys/types.h>
26 #include <sys/stat.h>
27 #include <uuid/uuid.h>
28 #include <fcntl.h>
29 #include <unistd.h>
30 #include <mntent.h>
31 #include <ctype.h>
32 #include <linux/loop.h>
33 #include <linux/major.h>
34 #include <linux/kdev_t.h>
35 #include <limits.h>
36 #include <blkid/blkid.h>
37 #include <sys/vfs.h>
38 #include <sys/statfs.h>
39 #include <linux/magic.h>
40 #include <getopt.h>
42 #include "kerncompat.h"
43 #include "radix-tree.h"
44 #include "ctree.h"
45 #include "disk-io.h"
46 #include "transaction.h"
47 #include "crc32c.h"
48 #include "utils.h"
49 #include "volumes.h"
50 #include "ioctl.h"
51 #include "commands.h"
53 #ifndef BLKDISCARD
54 #define BLKDISCARD _IO(0x12,119)
55 #endif
57 static int btrfs_scan_done = 0;
59 static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
61 const char *get_argv0_buf(void)
63 return argv0_buf;
66 void fixup_argv0(char **argv, const char *token)
68 int len = strlen(argv0_buf);
70 snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
71 argv[0] = argv0_buf;
74 void set_argv0(char **argv)
76 strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
77 argv0_buf[sizeof(argv0_buf) - 1] = 0;
80 int check_argc_exact(int nargs, int expected)
82 if (nargs < expected)
83 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
84 if (nargs > expected)
85 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
87 return nargs != expected;
90 int check_argc_min(int nargs, int expected)
92 if (nargs < expected) {
93 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
94 return 1;
97 return 0;
100 int check_argc_max(int nargs, int expected)
102 if (nargs > expected) {
103 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
104 return 1;
107 return 0;
112 * Discard the given range in one go
114 static int discard_range(int fd, u64 start, u64 len)
116 u64 range[2] = { start, len };
118 if (ioctl(fd, BLKDISCARD, &range) < 0)
119 return errno;
120 return 0;
124 * Discard blocks in the given range in 1G chunks, the process is interruptible
126 static int discard_blocks(int fd, u64 start, u64 len)
128 while (len > 0) {
129 /* 1G granularity */
130 u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
131 int ret;
133 ret = discard_range(fd, start, chunk_size);
134 if (ret)
135 return ret;
136 len -= chunk_size;
137 start += chunk_size;
140 return 0;
143 static u64 reference_root_table[] = {
144 [1] = BTRFS_ROOT_TREE_OBJECTID,
145 [2] = BTRFS_EXTENT_TREE_OBJECTID,
146 [3] = BTRFS_CHUNK_TREE_OBJECTID,
147 [4] = BTRFS_DEV_TREE_OBJECTID,
148 [5] = BTRFS_FS_TREE_OBJECTID,
149 [6] = BTRFS_CSUM_TREE_OBJECTID,
152 int test_uuid_unique(char *fs_uuid)
154 int unique = 1;
155 blkid_dev_iterate iter = NULL;
156 blkid_dev dev = NULL;
157 blkid_cache cache = NULL;
159 if (blkid_get_cache(&cache, NULL) < 0) {
160 printf("ERROR: lblkid cache get failed\n");
161 return 1;
163 blkid_probe_all(cache);
164 iter = blkid_dev_iterate_begin(cache);
165 blkid_dev_set_search(iter, "UUID", fs_uuid);
167 while (blkid_dev_next(iter, &dev) == 0) {
168 dev = blkid_verify(cache, dev);
169 if (dev) {
170 unique = 0;
171 break;
175 blkid_dev_iterate_end(iter);
176 blkid_put_cache(cache);
178 return unique;
182 * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
184 int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
186 struct btrfs_super_block super;
187 struct extent_buffer *buf;
188 struct btrfs_root_item root_item;
189 struct btrfs_disk_key disk_key;
190 struct btrfs_extent_item *extent_item;
191 struct btrfs_inode_item *inode_item;
192 struct btrfs_chunk *chunk;
193 struct btrfs_dev_item *dev_item;
194 struct btrfs_dev_extent *dev_extent;
195 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
196 u8 *ptr;
197 int i;
198 int ret;
199 u32 itemoff;
200 u32 nritems = 0;
201 u64 first_free;
202 u64 ref_root;
203 u32 array_size;
204 u32 item_size;
205 int skinny_metadata = !!(cfg->features &
206 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
207 u64 num_bytes;
209 buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
210 if (!buf)
211 return -ENOMEM;
213 first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
214 first_free &= ~((u64)cfg->sectorsize - 1);
216 memset(&super, 0, sizeof(super));
218 num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
219 if (cfg->fs_uuid && *cfg->fs_uuid) {
220 if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
221 fprintf(stderr, "could not parse UUID: %s\n",
222 cfg->fs_uuid);
223 ret = -EINVAL;
224 goto out;
226 if (!test_uuid_unique(cfg->fs_uuid)) {
227 fprintf(stderr, "non-unique UUID: %s\n", cfg->fs_uuid);
228 ret = -EBUSY;
229 goto out;
231 } else {
232 uuid_generate(super.fsid);
233 if (cfg->fs_uuid)
234 uuid_unparse(super.fsid, cfg->fs_uuid);
236 uuid_generate(super.dev_item.uuid);
237 uuid_generate(chunk_tree_uuid);
239 btrfs_set_super_bytenr(&super, cfg->blocks[0]);
240 btrfs_set_super_num_devices(&super, 1);
241 btrfs_set_super_magic(&super, BTRFS_MAGIC);
242 btrfs_set_super_generation(&super, 1);
243 btrfs_set_super_root(&super, cfg->blocks[1]);
244 btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
245 btrfs_set_super_total_bytes(&super, num_bytes);
246 btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
247 btrfs_set_super_sectorsize(&super, cfg->sectorsize);
248 btrfs_set_super_leafsize(&super, cfg->nodesize);
249 btrfs_set_super_nodesize(&super, cfg->nodesize);
250 btrfs_set_super_stripesize(&super, cfg->stripesize);
251 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
252 btrfs_set_super_chunk_root_generation(&super, 1);
253 btrfs_set_super_cache_generation(&super, -1);
254 btrfs_set_super_incompat_flags(&super, cfg->features);
255 if (cfg->label)
256 strncpy(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
258 /* create the tree of root objects */
259 memset(buf->data, 0, cfg->nodesize);
260 buf->len = cfg->nodesize;
261 btrfs_set_header_bytenr(buf, cfg->blocks[1]);
262 btrfs_set_header_nritems(buf, 4);
263 btrfs_set_header_generation(buf, 1);
264 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
265 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
266 write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
267 BTRFS_FSID_SIZE);
269 write_extent_buffer(buf, chunk_tree_uuid,
270 btrfs_header_chunk_tree_uuid(buf),
271 BTRFS_UUID_SIZE);
273 /* create the items for the root tree */
274 memset(&root_item, 0, sizeof(root_item));
275 inode_item = &root_item.inode;
276 btrfs_set_stack_inode_generation(inode_item, 1);
277 btrfs_set_stack_inode_size(inode_item, 3);
278 btrfs_set_stack_inode_nlink(inode_item, 1);
279 btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
280 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
281 btrfs_set_root_refs(&root_item, 1);
282 btrfs_set_root_used(&root_item, cfg->nodesize);
283 btrfs_set_root_generation(&root_item, 1);
285 memset(&disk_key, 0, sizeof(disk_key));
286 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
287 btrfs_set_disk_key_offset(&disk_key, 0);
288 nritems = 0;
290 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
291 btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
292 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
293 btrfs_set_item_key(buf, &disk_key, nritems);
294 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
295 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
296 sizeof(root_item));
297 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
298 nritems), sizeof(root_item));
299 nritems++;
301 itemoff = itemoff - sizeof(root_item);
302 btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
303 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
304 btrfs_set_item_key(buf, &disk_key, nritems);
305 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
306 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
307 sizeof(root_item));
308 write_extent_buffer(buf, &root_item,
309 btrfs_item_ptr_offset(buf, nritems),
310 sizeof(root_item));
311 nritems++;
313 itemoff = itemoff - sizeof(root_item);
314 btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
315 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
316 btrfs_set_item_key(buf, &disk_key, nritems);
317 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
318 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
319 sizeof(root_item));
320 write_extent_buffer(buf, &root_item,
321 btrfs_item_ptr_offset(buf, nritems),
322 sizeof(root_item));
323 nritems++;
325 itemoff = itemoff - sizeof(root_item);
326 btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
327 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
328 btrfs_set_item_key(buf, &disk_key, nritems);
329 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
330 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
331 sizeof(root_item));
332 write_extent_buffer(buf, &root_item,
333 btrfs_item_ptr_offset(buf, nritems),
334 sizeof(root_item));
335 nritems++;
338 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
339 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
340 if (ret != cfg->nodesize) {
341 ret = (ret < 0 ? -errno : -EIO);
342 goto out;
345 /* create the items for the extent tree */
346 memset(buf->data + sizeof(struct btrfs_header), 0,
347 cfg->nodesize - sizeof(struct btrfs_header));
348 nritems = 0;
349 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
350 for (i = 1; i < 7; i++) {
351 item_size = sizeof(struct btrfs_extent_item);
352 if (!skinny_metadata)
353 item_size += sizeof(struct btrfs_tree_block_info);
355 BUG_ON(cfg->blocks[i] < first_free);
356 BUG_ON(cfg->blocks[i] < cfg->blocks[i - 1]);
358 /* create extent item */
359 itemoff -= item_size;
360 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
361 if (skinny_metadata) {
362 btrfs_set_disk_key_type(&disk_key,
363 BTRFS_METADATA_ITEM_KEY);
364 btrfs_set_disk_key_offset(&disk_key, 0);
365 } else {
366 btrfs_set_disk_key_type(&disk_key,
367 BTRFS_EXTENT_ITEM_KEY);
368 btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
370 btrfs_set_item_key(buf, &disk_key, nritems);
371 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
372 itemoff);
373 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
374 item_size);
375 extent_item = btrfs_item_ptr(buf, nritems,
376 struct btrfs_extent_item);
377 btrfs_set_extent_refs(buf, extent_item, 1);
378 btrfs_set_extent_generation(buf, extent_item, 1);
379 btrfs_set_extent_flags(buf, extent_item,
380 BTRFS_EXTENT_FLAG_TREE_BLOCK);
381 nritems++;
383 /* create extent ref */
384 ref_root = reference_root_table[i];
385 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
386 btrfs_set_disk_key_offset(&disk_key, ref_root);
387 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
388 btrfs_set_item_key(buf, &disk_key, nritems);
389 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
390 itemoff);
391 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
392 nritems++;
394 btrfs_set_header_bytenr(buf, cfg->blocks[2]);
395 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
396 btrfs_set_header_nritems(buf, nritems);
397 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
398 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
399 if (ret != cfg->nodesize) {
400 ret = (ret < 0 ? -errno : -EIO);
401 goto out;
404 /* create the chunk tree */
405 memset(buf->data + sizeof(struct btrfs_header), 0,
406 cfg->nodesize - sizeof(struct btrfs_header));
407 nritems = 0;
408 item_size = sizeof(*dev_item);
409 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
411 /* first device 1 (there is no device 0) */
412 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
413 btrfs_set_disk_key_offset(&disk_key, 1);
414 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
415 btrfs_set_item_key(buf, &disk_key, nritems);
416 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
417 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
419 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
420 btrfs_set_device_id(buf, dev_item, 1);
421 btrfs_set_device_generation(buf, dev_item, 0);
422 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
423 btrfs_set_device_bytes_used(buf, dev_item,
424 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
425 btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
426 btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
427 btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
428 btrfs_set_device_type(buf, dev_item, 0);
430 write_extent_buffer(buf, super.dev_item.uuid,
431 (unsigned long)btrfs_device_uuid(dev_item),
432 BTRFS_UUID_SIZE);
433 write_extent_buffer(buf, super.fsid,
434 (unsigned long)btrfs_device_fsid(dev_item),
435 BTRFS_UUID_SIZE);
436 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
437 sizeof(*dev_item));
439 nritems++;
440 item_size = btrfs_chunk_item_size(1);
441 itemoff = itemoff - item_size;
443 /* then we have chunk 0 */
444 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
445 btrfs_set_disk_key_offset(&disk_key, 0);
446 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
447 btrfs_set_item_key(buf, &disk_key, nritems);
448 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
449 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
451 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
452 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
453 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
454 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
455 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
456 btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
457 btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
458 btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
459 btrfs_set_chunk_num_stripes(buf, chunk, 1);
460 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
461 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
462 nritems++;
464 write_extent_buffer(buf, super.dev_item.uuid,
465 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
466 BTRFS_UUID_SIZE);
468 /* copy the key for the chunk to the system array */
469 ptr = super.sys_chunk_array;
470 array_size = sizeof(disk_key);
472 memcpy(ptr, &disk_key, sizeof(disk_key));
473 ptr += sizeof(disk_key);
475 /* copy the chunk to the system array */
476 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
477 array_size += item_size;
478 ptr += item_size;
479 btrfs_set_super_sys_array_size(&super, array_size);
481 btrfs_set_header_bytenr(buf, cfg->blocks[3]);
482 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
483 btrfs_set_header_nritems(buf, nritems);
484 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
485 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
486 if (ret != cfg->nodesize) {
487 ret = (ret < 0 ? -errno : -EIO);
488 goto out;
491 /* create the device tree */
492 memset(buf->data + sizeof(struct btrfs_header), 0,
493 cfg->nodesize - sizeof(struct btrfs_header));
494 nritems = 0;
495 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
496 sizeof(struct btrfs_dev_extent);
498 btrfs_set_disk_key_objectid(&disk_key, 1);
499 btrfs_set_disk_key_offset(&disk_key, 0);
500 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
501 btrfs_set_item_key(buf, &disk_key, nritems);
502 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
503 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
504 sizeof(struct btrfs_dev_extent));
505 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
506 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
507 BTRFS_CHUNK_TREE_OBJECTID);
508 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
509 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
510 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
512 write_extent_buffer(buf, chunk_tree_uuid,
513 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
514 BTRFS_UUID_SIZE);
516 btrfs_set_dev_extent_length(buf, dev_extent,
517 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
518 nritems++;
520 btrfs_set_header_bytenr(buf, cfg->blocks[4]);
521 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
522 btrfs_set_header_nritems(buf, nritems);
523 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
524 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
525 if (ret != cfg->nodesize) {
526 ret = (ret < 0 ? -errno : -EIO);
527 goto out;
530 /* create the FS root */
531 memset(buf->data + sizeof(struct btrfs_header), 0,
532 cfg->nodesize - sizeof(struct btrfs_header));
533 btrfs_set_header_bytenr(buf, cfg->blocks[5]);
534 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
535 btrfs_set_header_nritems(buf, 0);
536 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
537 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
538 if (ret != cfg->nodesize) {
539 ret = (ret < 0 ? -errno : -EIO);
540 goto out;
542 /* finally create the csum root */
543 memset(buf->data + sizeof(struct btrfs_header), 0,
544 cfg->nodesize - sizeof(struct btrfs_header));
545 btrfs_set_header_bytenr(buf, cfg->blocks[6]);
546 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
547 btrfs_set_header_nritems(buf, 0);
548 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
549 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
550 if (ret != cfg->nodesize) {
551 ret = (ret < 0 ? -errno : -EIO);
552 goto out;
555 /* and write out the super block */
556 BUG_ON(sizeof(super) > cfg->sectorsize);
557 memset(buf->data, 0, BTRFS_SUPER_INFO_SIZE);
558 memcpy(buf->data, &super, sizeof(super));
559 buf->len = BTRFS_SUPER_INFO_SIZE;
560 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
561 ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, cfg->blocks[0]);
562 if (ret != BTRFS_SUPER_INFO_SIZE) {
563 ret = (ret < 0 ? -errno : -EIO);
564 goto out;
567 ret = 0;
569 out:
570 free(buf);
571 return ret;
574 static const struct btrfs_fs_feature {
575 const char *name;
576 u64 flag;
577 const char *desc;
578 } mkfs_features[] = {
579 { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
580 "mixed data and metadata block groups" },
581 { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
582 "increased hardlink limit per file to 65536" },
583 { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
584 "raid56 extended format" },
585 { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
586 "reduced-size metadata extent refs" },
587 { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
588 "no explicit hole extents for files" },
589 /* Keep this one last */
590 { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
593 static int parse_one_fs_feature(const char *name, u64 *flags)
595 int i;
596 int found = 0;
598 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
599 if (name[0] == '^' &&
600 !strcmp(mkfs_features[i].name, name + 1)) {
601 *flags &= ~ mkfs_features[i].flag;
602 found = 1;
603 } else if (!strcmp(mkfs_features[i].name, name)) {
604 *flags |= mkfs_features[i].flag;
605 found = 1;
609 return !found;
612 void btrfs_parse_features_to_string(char *buf, u64 flags)
614 int i;
616 buf[0] = 0;
618 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
619 if (flags & mkfs_features[i].flag) {
620 if (*buf)
621 strcat(buf, ", ");
622 strcat(buf, mkfs_features[i].name);
627 void btrfs_process_fs_features(u64 flags)
629 int i;
631 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
632 if (flags & mkfs_features[i].flag) {
633 printf("Turning ON incompat feature '%s': %s\n",
634 mkfs_features[i].name,
635 mkfs_features[i].desc);
640 void btrfs_list_all_fs_features(u64 mask_disallowed)
642 int i;
644 fprintf(stderr, "Filesystem features available:\n");
645 for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
646 char *is_default = "";
648 if (mkfs_features[i].flag & mask_disallowed)
649 continue;
650 if (mkfs_features[i].flag & BTRFS_MKFS_DEFAULT_FEATURES)
651 is_default = ", default";
652 fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
653 mkfs_features[i].name,
654 mkfs_features[i].desc,
655 mkfs_features[i].flag,
656 is_default);
661 * Return NULL if all features were parsed fine, otherwise return the name of
662 * the first unparsed.
664 char* btrfs_parse_fs_features(char *namelist, u64 *flags)
666 char *this_char;
667 char *save_ptr = NULL; /* Satisfy static checkers */
669 for (this_char = strtok_r(namelist, ",", &save_ptr);
670 this_char != NULL;
671 this_char = strtok_r(NULL, ",", &save_ptr)) {
672 if (parse_one_fs_feature(this_char, flags))
673 return this_char;
676 return NULL;
679 u64 btrfs_device_size(int fd, struct stat *st)
681 u64 size;
682 if (S_ISREG(st->st_mode)) {
683 return st->st_size;
685 if (!S_ISBLK(st->st_mode)) {
686 return 0;
688 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
689 return size;
691 return 0;
694 static int zero_blocks(int fd, off_t start, size_t len)
696 char *buf = malloc(len);
697 int ret = 0;
698 ssize_t written;
700 if (!buf)
701 return -ENOMEM;
702 memset(buf, 0, len);
703 written = pwrite(fd, buf, len, start);
704 if (written != len)
705 ret = -EIO;
706 free(buf);
707 return ret;
710 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
712 /* don't write outside the device by clamping the region to the device size */
713 static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
715 off_t end = max(start, start + len);
717 #ifdef __sparc__
718 /* and don't overwrite the disk labels on sparc */
719 start = max(start, 1024);
720 end = max(end, 1024);
721 #endif
723 start = min_t(u64, start, dev_size);
724 end = min_t(u64, end, dev_size);
726 return zero_blocks(fd, start, end - start);
729 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
730 struct btrfs_root *root, int fd, char *path,
731 u64 device_total_bytes, u32 io_width, u32 io_align,
732 u32 sectorsize)
734 struct btrfs_super_block *disk_super;
735 struct btrfs_super_block *super = root->fs_info->super_copy;
736 struct btrfs_device *device;
737 struct btrfs_dev_item *dev_item;
738 char *buf = NULL;
739 u64 fs_total_bytes;
740 u64 num_devs;
741 int ret;
743 device_total_bytes = (device_total_bytes / sectorsize) * sectorsize;
745 device = kzalloc(sizeof(*device), GFP_NOFS);
746 if (!device)
747 goto err_nomem;
748 buf = kzalloc(sectorsize, GFP_NOFS);
749 if (!buf)
750 goto err_nomem;
751 BUG_ON(sizeof(*disk_super) > sectorsize);
753 disk_super = (struct btrfs_super_block *)buf;
754 dev_item = &disk_super->dev_item;
756 uuid_generate(device->uuid);
757 device->devid = 0;
758 device->type = 0;
759 device->io_width = io_width;
760 device->io_align = io_align;
761 device->sector_size = sectorsize;
762 device->fd = fd;
763 device->writeable = 1;
764 device->total_bytes = device_total_bytes;
765 device->bytes_used = 0;
766 device->total_ios = 0;
767 device->dev_root = root->fs_info->dev_root;
768 device->name = strdup(path);
769 if (!device->name)
770 goto err_nomem;
772 INIT_LIST_HEAD(&device->dev_list);
773 ret = btrfs_add_device(trans, root, device);
774 BUG_ON(ret);
776 fs_total_bytes = btrfs_super_total_bytes(super) + device_total_bytes;
777 btrfs_set_super_total_bytes(super, fs_total_bytes);
779 num_devs = btrfs_super_num_devices(super) + 1;
780 btrfs_set_super_num_devices(super, num_devs);
782 memcpy(disk_super, super, sizeof(*disk_super));
784 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
785 btrfs_set_stack_device_id(dev_item, device->devid);
786 btrfs_set_stack_device_type(dev_item, device->type);
787 btrfs_set_stack_device_io_align(dev_item, device->io_align);
788 btrfs_set_stack_device_io_width(dev_item, device->io_width);
789 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
790 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
791 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
792 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
794 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
795 BUG_ON(ret != sectorsize);
797 kfree(buf);
798 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
799 device->fs_devices = root->fs_info->fs_devices;
800 return 0;
802 err_nomem:
803 kfree(device);
804 kfree(buf);
805 return -ENOMEM;
808 static int btrfs_wipe_existing_sb(int fd)
810 const char *off = NULL;
811 size_t len = 0;
812 loff_t offset;
813 char buf[BUFSIZ];
814 int ret = 0;
815 blkid_probe pr = NULL;
817 pr = blkid_new_probe();
818 if (!pr)
819 return -1;
821 if (blkid_probe_set_device(pr, fd, 0, 0)) {
822 ret = -1;
823 goto out;
826 ret = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
827 if (!ret)
828 ret = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
830 if (ret || len == 0 || off == NULL) {
832 * If lookup fails, the probe did not find any values, eg. for
833 * a file image or a loop device. Soft error.
835 ret = 1;
836 goto out;
839 offset = strtoll(off, NULL, 10);
840 if (len > sizeof(buf))
841 len = sizeof(buf);
843 memset(buf, 0, len);
844 ret = pwrite(fd, buf, len, offset);
845 if (ret != len) {
846 fprintf(stderr, "ERROR: cannot wipe existing superblock\n");
847 ret = -1;
849 fsync(fd);
851 out:
852 blkid_free_probe(pr);
853 return ret;
856 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
857 u64 max_block_count, int discard)
859 u64 block_count;
860 struct stat st;
861 int i, ret;
863 ret = fstat(fd, &st);
864 if (ret < 0) {
865 fprintf(stderr, "unable to stat %s\n", file);
866 return 1;
869 block_count = btrfs_device_size(fd, &st);
870 if (block_count == 0) {
871 fprintf(stderr, "unable to find %s size\n", file);
872 return 1;
874 if (max_block_count)
875 block_count = min(block_count, max_block_count);
877 if (discard) {
879 * We intentionally ignore errors from the discard ioctl. It
880 * is not necessary for the mkfs functionality but just an
881 * optimization.
883 if (discard_range(fd, 0, 0) == 0) {
884 printf("Performing full device TRIM (%s) ...\n",
885 pretty_size(block_count));
886 discard_blocks(fd, 0, block_count);
890 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
891 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
892 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
893 BTRFS_SUPER_INFO_SIZE, block_count);
894 if (!ret && zero_end)
895 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
896 ZERO_DEV_BYTES, block_count);
898 if (ret < 0) {
899 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
900 file, strerror(-ret));
901 return 1;
904 ret = btrfs_wipe_existing_sb(fd);
905 if (ret < 0) {
906 fprintf(stderr, "ERROR: cannot wipe superblocks on '%s'\n",
907 file);
908 return 1;
911 *block_count_ret = block_count;
912 return 0;
915 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
916 struct btrfs_root *root, u64 objectid)
918 int ret;
919 struct btrfs_inode_item inode_item;
920 time_t now = time(NULL);
922 memset(&inode_item, 0, sizeof(inode_item));
923 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
924 btrfs_set_stack_inode_size(&inode_item, 0);
925 btrfs_set_stack_inode_nlink(&inode_item, 1);
926 btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
927 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
928 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
929 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
930 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
931 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
932 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
933 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
934 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
935 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
937 if (root->fs_info->tree_root == root)
938 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
940 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
941 if (ret)
942 goto error;
944 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
945 if (ret)
946 goto error;
948 btrfs_set_root_dirid(&root->root_item, objectid);
949 ret = 0;
950 error:
951 return ret;
955 * checks if a path is a block device node
956 * Returns negative errno on failure, otherwise
957 * returns 1 for blockdev, 0 for not-blockdev
959 int is_block_device(const char *path)
961 struct stat statbuf;
963 if (stat(path, &statbuf) < 0)
964 return -errno;
966 return !!S_ISBLK(statbuf.st_mode);
970 * check if given path is a mount point
971 * return 1 if yes. 0 if no. -1 for error
973 int is_mount_point(const char *path)
975 FILE *f;
976 struct mntent *mnt;
977 int ret = 0;
979 f = setmntent("/proc/self/mounts", "r");
980 if (f == NULL)
981 return -1;
983 while ((mnt = getmntent(f)) != NULL) {
984 if (strcmp(mnt->mnt_dir, path))
985 continue;
986 ret = 1;
987 break;
989 endmntent(f);
990 return ret;
993 static int is_reg_file(const char *path)
995 struct stat statbuf;
997 if (stat(path, &statbuf) < 0)
998 return -errno;
999 return S_ISREG(statbuf.st_mode);
1003 * This function checks if the given input parameter is
1004 * an uuid or a path
1005 * return <0 : some error in the given input
1006 * return BTRFS_ARG_UNKNOWN: unknown input
1007 * return BTRFS_ARG_UUID: given input is uuid
1008 * return BTRFS_ARG_MNTPOINT: given input is path
1009 * return BTRFS_ARG_REG: given input is regular file
1010 * return BTRFS_ARG_BLKDEV: given input is block device
1012 int check_arg_type(const char *input)
1014 uuid_t uuid;
1015 char path[PATH_MAX];
1017 if (!input)
1018 return -EINVAL;
1020 if (realpath(input, path)) {
1021 if (is_block_device(path) == 1)
1022 return BTRFS_ARG_BLKDEV;
1024 if (is_mount_point(path) == 1)
1025 return BTRFS_ARG_MNTPOINT;
1027 if (is_reg_file(path))
1028 return BTRFS_ARG_REG;
1030 return BTRFS_ARG_UNKNOWN;
1033 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
1034 !uuid_parse(input, uuid))
1035 return BTRFS_ARG_UUID;
1037 return BTRFS_ARG_UNKNOWN;
1041 * Find the mount point for a mounted device.
1042 * On success, returns 0 with mountpoint in *mp.
1043 * On failure, returns -errno (not mounted yields -EINVAL)
1044 * Is noisy on failures, expects to be given a mounted device.
1046 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
1048 int ret;
1049 int fd = -1;
1051 ret = is_block_device(dev);
1052 if (ret <= 0) {
1053 if (!ret) {
1054 fprintf(stderr, "%s is not a block device\n", dev);
1055 ret = -EINVAL;
1056 } else {
1057 fprintf(stderr, "Could not check %s: %s\n",
1058 dev, strerror(-ret));
1060 goto out;
1063 fd = open(dev, O_RDONLY);
1064 if (fd < 0) {
1065 ret = -errno;
1066 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
1067 goto out;
1070 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
1071 if (!ret) {
1072 ret = -EINVAL;
1073 } else { /* mounted, all good */
1074 ret = 0;
1076 out:
1077 if (fd != -1)
1078 close(fd);
1079 return ret;
1083 * Given a pathname, return a filehandle to:
1084 * the original pathname or,
1085 * if the pathname is a mounted btrfs device, to its mountpoint.
1087 * On error, return -1, errno should be set.
1089 int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
1091 char mp[PATH_MAX];
1092 int ret;
1094 if (is_block_device(path)) {
1095 ret = get_btrfs_mount(path, mp, sizeof(mp));
1096 if (ret < 0) {
1097 /* not a mounted btrfs dev */
1098 error_on(verbose, "'%s' is not a mounted btrfs device",
1099 path);
1100 errno = EINVAL;
1101 return -1;
1103 ret = open_file_or_dir(mp, dirstream);
1104 error_on(verbose && ret < 0, "can't access '%s': %s",
1105 path, strerror(errno));
1106 } else {
1107 ret = btrfs_open_dir(path, dirstream, 1);
1110 return ret;
1114 * Do the following checks before calling open_file_or_dir():
1115 * 1: path is in a btrfs filesystem
1116 * 2: path is a directory
1118 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
1120 struct statfs stfs;
1121 struct stat st;
1122 int ret;
1124 if (statfs(path, &stfs) != 0) {
1125 if (verbose)
1126 fprintf(stderr,
1127 "ERROR: can't access '%s': %s\n",
1128 path, strerror(errno));
1129 return -1;
1132 if (stfs.f_type != BTRFS_SUPER_MAGIC) {
1133 if (verbose)
1134 fprintf(stderr,
1135 "ERROR: not a btrfs filesystem: %s\n",
1136 path);
1137 return -2;
1140 if (stat(path, &st) != 0) {
1141 if (verbose)
1142 fprintf(stderr,
1143 "ERROR: can't access '%s': %s\n",
1144 path, strerror(errno));
1145 return -1;
1148 if (!S_ISDIR(st.st_mode)) {
1149 if (verbose)
1150 fprintf(stderr,
1151 "ERROR: not a directory: %s\n",
1152 path);
1153 return -3;
1156 ret = open_file_or_dir(path, dirstream);
1157 if (ret < 0) {
1158 if (verbose)
1159 fprintf(stderr,
1160 "ERROR: can't access '%s': %s\n",
1161 path, strerror(errno));
1164 return ret;
1167 /* checks if a device is a loop device */
1168 static int is_loop_device (const char* device) {
1169 struct stat statbuf;
1171 if(stat(device, &statbuf) < 0)
1172 return -errno;
1174 return (S_ISBLK(statbuf.st_mode) &&
1175 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
1179 * Takes a loop device path (e.g. /dev/loop0) and returns
1180 * the associated file (e.g. /images/my_btrfs.img) using
1181 * loopdev API
1183 static int resolve_loop_device_with_loopdev(const char* loop_dev, char* loop_file)
1185 int fd;
1186 int ret;
1187 struct loop_info64 lo64;
1189 fd = open(loop_dev, O_RDONLY | O_NONBLOCK);
1190 if (fd < 0)
1191 return -errno;
1192 ret = ioctl(fd, LOOP_GET_STATUS64, &lo64);
1193 if (ret < 0) {
1194 ret = -errno;
1195 goto out;
1198 memcpy(loop_file, lo64.lo_file_name, sizeof(lo64.lo_file_name));
1199 loop_file[sizeof(lo64.lo_file_name)] = 0;
1201 out:
1202 close(fd);
1204 return ret;
1207 /* Takes a loop device path (e.g. /dev/loop0) and returns
1208 * the associated file (e.g. /images/my_btrfs.img) */
1209 static int resolve_loop_device(const char* loop_dev, char* loop_file,
1210 int max_len)
1212 int ret;
1213 FILE *f;
1214 char fmt[20];
1215 char p[PATH_MAX];
1216 char real_loop_dev[PATH_MAX];
1218 if (!realpath(loop_dev, real_loop_dev))
1219 return -errno;
1220 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
1221 if (!(f = fopen(p, "r"))) {
1222 if (errno == ENOENT)
1224 * It's possibly a partitioned loop device, which is
1225 * resolvable with loopdev API.
1227 return resolve_loop_device_with_loopdev(loop_dev, loop_file);
1228 return -errno;
1231 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
1232 ret = fscanf(f, fmt, loop_file);
1233 fclose(f);
1234 if (ret == EOF)
1235 return -errno;
1237 return 0;
1241 * Checks whether a and b are identical or device
1242 * files associated with the same block device
1244 static int is_same_blk_file(const char* a, const char* b)
1246 struct stat st_buf_a, st_buf_b;
1247 char real_a[PATH_MAX];
1248 char real_b[PATH_MAX];
1250 if (!realpath(a, real_a))
1251 strncpy_null(real_a, a);
1253 if (!realpath(b, real_b))
1254 strncpy_null(real_b, b);
1256 /* Identical path? */
1257 if (strcmp(real_a, real_b) == 0)
1258 return 1;
1260 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
1261 if (errno == ENOENT)
1262 return 0;
1263 return -errno;
1266 /* Same blockdevice? */
1267 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
1268 st_buf_a.st_rdev == st_buf_b.st_rdev) {
1269 return 1;
1272 /* Hardlink? */
1273 if (st_buf_a.st_dev == st_buf_b.st_dev &&
1274 st_buf_a.st_ino == st_buf_b.st_ino) {
1275 return 1;
1278 return 0;
1281 /* checks if a and b are identical or device
1282 * files associated with the same block device or
1283 * if one file is a loop device that uses the other
1284 * file.
1286 static int is_same_loop_file(const char* a, const char* b)
1288 char res_a[PATH_MAX];
1289 char res_b[PATH_MAX];
1290 const char* final_a = NULL;
1291 const char* final_b = NULL;
1292 int ret;
1294 /* Resolve a if it is a loop device */
1295 if((ret = is_loop_device(a)) < 0) {
1296 if (ret == -ENOENT)
1297 return 0;
1298 return ret;
1299 } else if (ret) {
1300 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1301 if (ret < 0) {
1302 if (errno != EPERM)
1303 return ret;
1304 } else {
1305 final_a = res_a;
1307 } else {
1308 final_a = a;
1311 /* Resolve b if it is a loop device */
1312 if ((ret = is_loop_device(b)) < 0) {
1313 if (ret == -ENOENT)
1314 return 0;
1315 return ret;
1316 } else if (ret) {
1317 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1318 if (ret < 0) {
1319 if (errno != EPERM)
1320 return ret;
1321 } else {
1322 final_b = res_b;
1324 } else {
1325 final_b = b;
1328 return is_same_blk_file(final_a, final_b);
1331 /* Checks if a file exists and is a block or regular file*/
1332 static int is_existing_blk_or_reg_file(const char* filename)
1334 struct stat st_buf;
1336 if(stat(filename, &st_buf) < 0) {
1337 if(errno == ENOENT)
1338 return 0;
1339 else
1340 return -errno;
1343 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1346 /* Checks if a file is used (directly or indirectly via a loop device)
1347 * by a device in fs_devices
1349 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1350 const char* file)
1352 int ret;
1353 struct list_head *head;
1354 struct list_head *cur;
1355 struct btrfs_device *device;
1357 head = &fs_devices->devices;
1358 list_for_each(cur, head) {
1359 device = list_entry(cur, struct btrfs_device, dev_list);
1361 if((ret = is_same_loop_file(device->name, file)))
1362 return ret;
1365 return 0;
1369 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1370 * Returns NULL on invalid input or malloc failure; Other failures
1371 * will be handled by the caller using the input pathame.
1373 char *canonicalize_dm_name(const char *ptname)
1375 FILE *f;
1376 size_t sz;
1377 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1379 if (!ptname || !*ptname)
1380 return NULL;
1382 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1383 if (!(f = fopen(path, "r")))
1384 return NULL;
1386 /* read <name>\n from sysfs */
1387 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1388 name[sz - 1] = '\0';
1389 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1391 if (access(path, F_OK) == 0)
1392 res = strdup(path);
1394 fclose(f);
1395 return res;
1399 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1400 * to a device mapper pathname.
1401 * Returns NULL on invalid input or malloc failure; Other failures
1402 * will be handled by the caller using the input pathame.
1404 char *canonicalize_path(const char *path)
1406 char *canonical, *p;
1408 if (!path || !*path)
1409 return NULL;
1411 canonical = realpath(path, NULL);
1412 if (!canonical)
1413 return strdup(path);
1414 p = strrchr(canonical, '/');
1415 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1416 char *dm = canonicalize_dm_name(p + 1);
1418 if (dm) {
1419 free(canonical);
1420 return dm;
1423 return canonical;
1427 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1428 * is safe to continue.
1430 int check_mounted(const char* file)
1432 int fd;
1433 int ret;
1435 fd = open(file, O_RDONLY);
1436 if (fd < 0) {
1437 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1438 return -errno;
1441 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1442 close(fd);
1444 return ret;
1447 int check_mounted_where(int fd, const char *file, char *where, int size,
1448 struct btrfs_fs_devices **fs_dev_ret)
1450 int ret;
1451 u64 total_devs = 1;
1452 int is_btrfs;
1453 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1454 FILE *f;
1455 struct mntent *mnt;
1457 /* scan the initial device */
1458 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1459 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1460 is_btrfs = (ret >= 0);
1462 /* scan other devices */
1463 if (is_btrfs && total_devs > 1) {
1464 ret = btrfs_scan_lblkid();
1465 if (ret)
1466 return ret;
1469 /* iterate over the list of currently mountes filesystems */
1470 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1471 return -errno;
1473 while ((mnt = getmntent (f)) != NULL) {
1474 if(is_btrfs) {
1475 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1476 continue;
1478 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1479 } else {
1480 /* ignore entries in the mount table that are not
1481 associated with a file*/
1482 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1483 goto out_mntloop_err;
1484 else if(!ret)
1485 continue;
1487 ret = is_same_loop_file(file, mnt->mnt_fsname);
1490 if(ret < 0)
1491 goto out_mntloop_err;
1492 else if(ret)
1493 break;
1496 /* Did we find an entry in mnt table? */
1497 if (mnt && size && where) {
1498 strncpy(where, mnt->mnt_dir, size);
1499 where[size-1] = 0;
1501 if (fs_dev_ret)
1502 *fs_dev_ret = fs_devices_mnt;
1504 ret = (mnt != NULL);
1506 out_mntloop_err:
1507 endmntent (f);
1509 return ret;
1512 struct pending_dir {
1513 struct list_head list;
1514 char name[PATH_MAX];
1517 int btrfs_register_one_device(const char *fname)
1519 struct btrfs_ioctl_vol_args args;
1520 int fd;
1521 int ret;
1523 fd = open("/dev/btrfs-control", O_RDWR);
1524 if (fd < 0) {
1525 fprintf(stderr, "failed to open /dev/btrfs-control "
1526 "skipping device registration: %s\n",
1527 strerror(errno));
1528 return -errno;
1530 memset(&args, 0, sizeof(args));
1531 strncpy_null(args.name, fname);
1532 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1533 if (ret < 0) {
1534 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1535 fname, strerror(errno));
1536 ret = -errno;
1538 close(fd);
1539 return ret;
1543 * Register all devices in the fs_uuid list created in the user
1544 * space. Ensure btrfs_scan_lblkid() is called before this func.
1546 int btrfs_register_all_devices(void)
1548 int err;
1549 struct btrfs_fs_devices *fs_devices;
1550 struct btrfs_device *device;
1551 struct list_head *all_uuids;
1553 all_uuids = btrfs_scanned_uuids();
1555 list_for_each_entry(fs_devices, all_uuids, list) {
1556 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1557 if (*device->name) {
1558 err = btrfs_register_one_device(device->name);
1559 if (err < 0)
1560 return err;
1561 if (err > 0)
1562 return -err;
1566 return 0;
1569 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1570 int super_offset)
1572 struct btrfs_super_block *disk_super;
1573 char *buf;
1574 int ret = 0;
1576 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1577 if (!buf) {
1578 ret = -ENOMEM;
1579 goto out;
1581 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1582 if (ret != BTRFS_SUPER_INFO_SIZE)
1583 goto brelse;
1585 ret = 0;
1586 disk_super = (struct btrfs_super_block *)buf;
1587 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1588 goto brelse;
1590 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1591 BTRFS_FSID_SIZE))
1592 ret = 1;
1593 brelse:
1594 free(buf);
1595 out:
1596 return ret;
1600 * Note: this function uses a static per-thread buffer. Do not call this
1601 * function more than 10 times within one argument list!
1603 const char *pretty_size_mode(u64 size, unsigned mode)
1605 static __thread int ps_index = 0;
1606 static __thread char ps_array[10][32];
1607 char *ret;
1609 ret = ps_array[ps_index];
1610 ps_index++;
1611 ps_index %= 10;
1612 (void)pretty_size_snprintf(size, ret, 32, mode);
1614 return ret;
1617 static const char* unit_suffix_binary[] =
1618 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1619 static const char* unit_suffix_decimal[] =
1620 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1622 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1624 int num_divs;
1625 float fraction;
1626 u64 base = 0;
1627 int mult = 0;
1628 const char** suffix = NULL;
1629 u64 last_size;
1631 if (str_size == 0)
1632 return 0;
1634 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1635 snprintf(str, str_size, "%llu", size);
1636 return 0;
1639 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1640 base = 1024;
1641 mult = 1024;
1642 suffix = unit_suffix_binary;
1643 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1644 base = 1000;
1645 mult = 1000;
1646 suffix = unit_suffix_decimal;
1649 /* Unknown mode */
1650 if (!base) {
1651 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1652 unit_mode);
1653 assert(0);
1654 return -1;
1657 num_divs = 0;
1658 last_size = size;
1659 switch (unit_mode & UNITS_MODE_MASK) {
1660 case UNITS_TBYTES: base *= mult; num_divs++;
1661 case UNITS_GBYTES: base *= mult; num_divs++;
1662 case UNITS_MBYTES: base *= mult; num_divs++;
1663 case UNITS_KBYTES: num_divs++;
1664 break;
1665 case UNITS_BYTES:
1666 base = 1;
1667 num_divs = 0;
1668 break;
1669 default:
1670 while (size >= mult) {
1671 last_size = size;
1672 size /= mult;
1673 num_divs++;
1677 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1678 str[0] = '\0';
1679 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1680 num_divs);
1681 assert(0);
1682 return -1;
1684 fraction = (float)last_size / base;
1686 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1690 * __strncpy__null - strncpy with null termination
1691 * @dest: the target array
1692 * @src: the source string
1693 * @n: maximum bytes to copy (size of *dest)
1695 * Like strncpy, but ensures destination is null-terminated.
1697 * Copies the string pointed to by src, including the terminating null
1698 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1699 * of n bytes. Then ensure that dest is null-terminated.
1701 char *__strncpy__null(char *dest, const char *src, size_t n)
1703 strncpy(dest, src, n);
1704 if (n > 0)
1705 dest[n - 1] = '\0';
1706 return dest;
1710 * Checks to make sure that the label matches our requirements.
1711 * Returns:
1712 0 if everything is safe and usable
1713 -1 if the label is too long
1715 static int check_label(const char *input)
1717 int len = strlen(input);
1719 if (len > BTRFS_LABEL_SIZE - 1) {
1720 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1721 input, BTRFS_LABEL_SIZE - 1);
1722 return -1;
1725 return 0;
1728 static int set_label_unmounted(const char *dev, const char *label)
1730 struct btrfs_trans_handle *trans;
1731 struct btrfs_root *root;
1732 int ret;
1734 ret = check_mounted(dev);
1735 if (ret < 0) {
1736 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1737 return -1;
1739 if (ret > 0) {
1740 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1741 dev);
1742 return -1;
1745 /* Open the super_block at the default location
1746 * and as read-write.
1748 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1749 if (!root) /* errors are printed by open_ctree() */
1750 return -1;
1752 trans = btrfs_start_transaction(root, 1);
1753 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1754 label);
1755 btrfs_commit_transaction(trans, root);
1757 /* Now we close it since we are done. */
1758 close_ctree(root);
1759 return 0;
1762 static int set_label_mounted(const char *mount_path, const char *label)
1764 int fd;
1766 fd = open(mount_path, O_RDONLY | O_NOATIME);
1767 if (fd < 0) {
1768 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1769 return -1;
1772 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1773 fprintf(stderr, "ERROR: unable to set label %s\n",
1774 strerror(errno));
1775 close(fd);
1776 return -1;
1779 close(fd);
1780 return 0;
1783 int get_label_unmounted(const char *dev, char *label)
1785 struct btrfs_root *root;
1786 int ret;
1788 ret = check_mounted(dev);
1789 if (ret < 0) {
1790 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1791 return -1;
1794 /* Open the super_block at the default location
1795 * and as read-only.
1797 root = open_ctree(dev, 0, 0);
1798 if(!root)
1799 return -1;
1801 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1803 /* Now we close it since we are done. */
1804 close_ctree(root);
1805 return 0;
1809 * If a partition is mounted, try to get the filesystem label via its
1810 * mounted path rather than device. Return the corresponding error
1811 * the user specified the device path.
1813 int get_label_mounted(const char *mount_path, char *labelp)
1815 char label[BTRFS_LABEL_SIZE];
1816 int fd;
1817 int ret;
1819 fd = open(mount_path, O_RDONLY | O_NOATIME);
1820 if (fd < 0) {
1821 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1822 return -1;
1825 memset(label, '\0', sizeof(label));
1826 ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
1827 if (ret < 0) {
1828 if (errno != ENOTTY)
1829 fprintf(stderr, "ERROR: unable to get label %s\n",
1830 strerror(errno));
1831 ret = -errno;
1832 close(fd);
1833 return ret;
1836 strncpy(labelp, label, sizeof(label));
1837 close(fd);
1838 return 0;
1841 int get_label(const char *btrfs_dev, char *label)
1843 int ret;
1845 ret = is_existing_blk_or_reg_file(btrfs_dev);
1846 if (!ret)
1847 ret = get_label_mounted(btrfs_dev, label);
1848 else if (ret > 0)
1849 ret = get_label_unmounted(btrfs_dev, label);
1851 return ret;
1854 int set_label(const char *btrfs_dev, const char *label)
1856 int ret;
1858 if (check_label(label))
1859 return -1;
1861 ret = is_existing_blk_or_reg_file(btrfs_dev);
1862 if (!ret)
1863 ret = set_label_mounted(btrfs_dev, label);
1864 else if (ret > 0)
1865 ret = set_label_unmounted(btrfs_dev, label);
1867 return ret;
1871 * Unsafe subvolume check.
1873 * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
1874 * btrfs mount point.
1875 * Must use together with other reliable method like btrfs ioctl.
1877 static int __is_subvol(const char *path)
1879 struct stat st;
1880 int ret;
1882 ret = lstat(path, &st);
1883 if (ret < 0)
1884 return ret;
1886 return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
1890 * A not-so-good version fls64. No fascinating optimization since
1891 * no one except parse_size use it
1893 static int fls64(u64 x)
1895 int i;
1897 for (i = 0; i <64; i++)
1898 if (x << i & (1ULL << 63))
1899 return 64 - i;
1900 return 64 - i;
1903 u64 parse_size(char *s)
1905 char c;
1906 char *endptr;
1907 u64 mult = 1;
1908 u64 ret;
1910 if (!s) {
1911 fprintf(stderr, "ERROR: Size value is empty\n");
1912 exit(1);
1914 if (s[0] == '-') {
1915 fprintf(stderr,
1916 "ERROR: Size value '%s' is less equal than 0\n", s);
1917 exit(1);
1919 ret = strtoull(s, &endptr, 10);
1920 if (endptr == s) {
1921 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1922 exit(1);
1924 if (endptr[0] && endptr[1]) {
1925 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1926 endptr[1]);
1927 exit(1);
1930 * strtoll returns LLONG_MAX when overflow, if this happens,
1931 * need to call strtoull to get the real size
1933 if (errno == ERANGE && ret == ULLONG_MAX) {
1934 fprintf(stderr,
1935 "ERROR: Size value '%s' is too large for u64\n", s);
1936 exit(1);
1938 if (endptr[0]) {
1939 c = tolower(endptr[0]);
1940 switch (c) {
1941 case 'e':
1942 mult *= 1024;
1943 /* fallthrough */
1944 case 'p':
1945 mult *= 1024;
1946 /* fallthrough */
1947 case 't':
1948 mult *= 1024;
1949 /* fallthrough */
1950 case 'g':
1951 mult *= 1024;
1952 /* fallthrough */
1953 case 'm':
1954 mult *= 1024;
1955 /* fallthrough */
1956 case 'k':
1957 mult *= 1024;
1958 /* fallthrough */
1959 case 'b':
1960 break;
1961 default:
1962 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1964 exit(1);
1967 /* Check whether ret * mult overflow */
1968 if (fls64(ret) + fls64(mult) - 1 > 64) {
1969 fprintf(stderr,
1970 "ERROR: Size value '%s' is too large for u64\n", s);
1971 exit(1);
1973 ret *= mult;
1974 return ret;
1977 u64 parse_qgroupid(const char *p)
1979 char *s = strchr(p, '/');
1980 const char *ptr_src_end = p + strlen(p);
1981 char *ptr_parse_end = NULL;
1982 u64 level;
1983 u64 id;
1984 int fd;
1985 int ret = 0;
1987 if (p[0] == '/')
1988 goto path;
1990 /* Numeric format like '0/257' is the primary case */
1991 if (!s) {
1992 id = strtoull(p, &ptr_parse_end, 10);
1993 if (ptr_parse_end != ptr_src_end)
1994 goto path;
1995 return id;
1997 level = strtoull(p, &ptr_parse_end, 10);
1998 if (ptr_parse_end != s)
1999 goto path;
2001 id = strtoull(s + 1, &ptr_parse_end, 10);
2002 if (ptr_parse_end != ptr_src_end)
2003 goto path;
2005 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
2007 path:
2008 /* Path format like subv at 'my_subvol' is the fallback case */
2009 ret = __is_subvol(p);
2010 if (ret < 0 || !ret)
2011 goto err;
2012 fd = open(p, O_RDONLY);
2013 if (fd < 0)
2014 goto err;
2015 ret = lookup_ino_rootid(fd, &id);
2016 close(fd);
2017 if (ret < 0)
2018 goto err;
2019 return id;
2021 err:
2022 fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
2023 exit(-1);
2026 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
2028 int ret;
2029 struct stat st;
2030 int fd;
2032 ret = stat(fname, &st);
2033 if (ret < 0) {
2034 return -1;
2036 if (S_ISDIR(st.st_mode)) {
2037 *dirstream = opendir(fname);
2038 if (!*dirstream)
2039 return -1;
2040 fd = dirfd(*dirstream);
2041 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
2042 fd = open(fname, open_flags);
2043 } else {
2045 * we set this on purpose, in case the caller output
2046 * strerror(errno) as success
2048 errno = EINVAL;
2049 return -1;
2051 if (fd < 0) {
2052 fd = -1;
2053 if (*dirstream) {
2054 closedir(*dirstream);
2055 *dirstream = NULL;
2058 return fd;
2061 int open_file_or_dir(const char *fname, DIR **dirstream)
2063 return open_file_or_dir3(fname, dirstream, O_RDWR);
2066 void close_file_or_dir(int fd, DIR *dirstream)
2068 if (dirstream)
2069 closedir(dirstream);
2070 else if (fd >= 0)
2071 close(fd);
2074 int get_device_info(int fd, u64 devid,
2075 struct btrfs_ioctl_dev_info_args *di_args)
2077 int ret;
2079 di_args->devid = devid;
2080 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
2082 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
2083 return ret < 0 ? -errno : 0;
2086 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
2087 int nr_items)
2089 struct btrfs_dev_item *dev_item;
2090 char *buf = search_args->buf;
2092 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
2093 + sizeof(struct btrfs_dev_item));
2094 buf += sizeof(struct btrfs_ioctl_search_header);
2096 dev_item = (struct btrfs_dev_item *)buf;
2098 return btrfs_stack_device_id(dev_item);
2101 static int search_chunk_tree_for_fs_info(int fd,
2102 struct btrfs_ioctl_fs_info_args *fi_args)
2104 int ret;
2105 int max_items;
2106 u64 start_devid = 1;
2107 struct btrfs_ioctl_search_args search_args;
2108 struct btrfs_ioctl_search_key *search_key = &search_args.key;
2110 fi_args->num_devices = 0;
2112 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
2113 / (sizeof(struct btrfs_ioctl_search_header)
2114 + sizeof(struct btrfs_dev_item));
2116 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
2117 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2118 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2119 search_key->min_type = BTRFS_DEV_ITEM_KEY;
2120 search_key->max_type = BTRFS_DEV_ITEM_KEY;
2121 search_key->min_transid = 0;
2122 search_key->max_transid = (u64)-1;
2123 search_key->nr_items = max_items;
2124 search_key->max_offset = (u64)-1;
2126 again:
2127 search_key->min_offset = start_devid;
2129 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
2130 if (ret < 0)
2131 return -errno;
2133 fi_args->num_devices += (u64)search_key->nr_items;
2135 if (search_key->nr_items == max_items) {
2136 start_devid = find_max_device_id(&search_args,
2137 search_key->nr_items) + 1;
2138 goto again;
2141 /* get the lastest max_id to stay consistent with the num_devices */
2142 if (search_key->nr_items == 0)
2144 * last tree_search returns an empty buf, use the devid of
2145 * the last dev_item of the previous tree_search
2147 fi_args->max_id = start_devid - 1;
2148 else
2149 fi_args->max_id = find_max_device_id(&search_args,
2150 search_key->nr_items);
2152 return 0;
2156 * For a given path, fill in the ioctl fs_ and info_ args.
2157 * If the path is a btrfs mountpoint, fill info for all devices.
2158 * If the path is a btrfs device, fill in only that device.
2160 * The path provided must be either on a mounted btrfs fs,
2161 * or be a mounted btrfs device.
2163 * Returns 0 on success, or a negative errno.
2165 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
2166 struct btrfs_ioctl_dev_info_args **di_ret)
2168 int fd = -1;
2169 int ret = 0;
2170 int ndevs = 0;
2171 int i = 0;
2172 int replacing = 0;
2173 struct btrfs_fs_devices *fs_devices_mnt = NULL;
2174 struct btrfs_ioctl_dev_info_args *di_args;
2175 struct btrfs_ioctl_dev_info_args tmp;
2176 char mp[PATH_MAX];
2177 DIR *dirstream = NULL;
2179 memset(fi_args, 0, sizeof(*fi_args));
2181 if (is_block_device(path) == 1) {
2182 struct btrfs_super_block *disk_super;
2183 char buf[BTRFS_SUPER_INFO_SIZE];
2184 u64 devid;
2186 /* Ensure it's mounted, then set path to the mountpoint */
2187 fd = open(path, O_RDONLY);
2188 if (fd < 0) {
2189 ret = -errno;
2190 fprintf(stderr, "Couldn't open %s: %s\n",
2191 path, strerror(errno));
2192 goto out;
2194 ret = check_mounted_where(fd, path, mp, sizeof(mp),
2195 &fs_devices_mnt);
2196 if (!ret) {
2197 ret = -EINVAL;
2198 goto out;
2200 if (ret < 0)
2201 goto out;
2202 path = mp;
2203 /* Only fill in this one device */
2204 fi_args->num_devices = 1;
2206 disk_super = (struct btrfs_super_block *)buf;
2207 ret = btrfs_read_dev_super(fd, disk_super,
2208 BTRFS_SUPER_INFO_OFFSET, 0);
2209 if (ret < 0) {
2210 ret = -EIO;
2211 goto out;
2213 devid = btrfs_stack_device_id(&disk_super->dev_item);
2215 fi_args->max_id = devid;
2216 i = devid;
2218 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
2219 close(fd);
2222 /* at this point path must not be for a block device */
2223 fd = open_file_or_dir(path, &dirstream);
2224 if (fd < 0) {
2225 ret = -errno;
2226 goto out;
2229 /* fill in fi_args if not just a single device */
2230 if (fi_args->num_devices != 1) {
2231 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
2232 if (ret < 0) {
2233 ret = -errno;
2234 goto out;
2238 * The fs_args->num_devices does not include seed devices
2240 ret = search_chunk_tree_for_fs_info(fd, fi_args);
2241 if (ret)
2242 goto out;
2245 * search_chunk_tree_for_fs_info() will lacks the devid 0
2246 * so manual probe for it here.
2248 ret = get_device_info(fd, 0, &tmp);
2249 if (!ret) {
2250 fi_args->num_devices++;
2251 ndevs++;
2252 replacing = 1;
2253 if (i == 0)
2254 i++;
2258 if (!fi_args->num_devices)
2259 goto out;
2261 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
2262 if (!di_args) {
2263 ret = -errno;
2264 goto out;
2267 if (replacing)
2268 memcpy(di_args, &tmp, sizeof(tmp));
2269 for (; i <= fi_args->max_id; ++i) {
2270 ret = get_device_info(fd, i, &di_args[ndevs]);
2271 if (ret == -ENODEV)
2272 continue;
2273 if (ret)
2274 goto out;
2275 ndevs++;
2279 * only when the only dev we wanted to find is not there then
2280 * let any error be returned
2282 if (fi_args->num_devices != 1) {
2283 BUG_ON(ndevs == 0);
2284 ret = 0;
2287 out:
2288 close_file_or_dir(fd, dirstream);
2289 return ret;
2292 #define isoctal(c) (((c) & ~7) == '0')
2294 static inline void translate(char *f, char *t)
2296 while (*f != '\0') {
2297 if (*f == '\\' &&
2298 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
2299 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
2300 f += 4;
2301 } else
2302 *t++ = *f++;
2304 *t = '\0';
2305 return;
2309 * Checks if the swap device.
2310 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2312 static int is_swap_device(const char *file)
2314 FILE *f;
2315 struct stat st_buf;
2316 dev_t dev;
2317 ino_t ino = 0;
2318 char tmp[PATH_MAX];
2319 char buf[PATH_MAX];
2320 char *cp;
2321 int ret = 0;
2323 if (stat(file, &st_buf) < 0)
2324 return -errno;
2325 if (S_ISBLK(st_buf.st_mode))
2326 dev = st_buf.st_rdev;
2327 else if (S_ISREG(st_buf.st_mode)) {
2328 dev = st_buf.st_dev;
2329 ino = st_buf.st_ino;
2330 } else
2331 return 0;
2333 if ((f = fopen("/proc/swaps", "r")) == NULL)
2334 return 0;
2336 /* skip the first line */
2337 if (fgets(tmp, sizeof(tmp), f) == NULL)
2338 goto out;
2340 while (fgets(tmp, sizeof(tmp), f) != NULL) {
2341 if ((cp = strchr(tmp, ' ')) != NULL)
2342 *cp = '\0';
2343 if ((cp = strchr(tmp, '\t')) != NULL)
2344 *cp = '\0';
2345 translate(tmp, buf);
2346 if (stat(buf, &st_buf) != 0)
2347 continue;
2348 if (S_ISBLK(st_buf.st_mode)) {
2349 if (dev == st_buf.st_rdev) {
2350 ret = 1;
2351 break;
2353 } else if (S_ISREG(st_buf.st_mode)) {
2354 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
2355 ret = 1;
2356 break;
2361 out:
2362 fclose(f);
2364 return ret;
2368 * Check for existing filesystem or partition table on device.
2369 * Returns:
2370 * 1 for existing fs or partition
2371 * 0 for nothing found
2372 * -1 for internal error
2374 static int
2375 check_overwrite(
2376 char *device)
2378 const char *type;
2379 blkid_probe pr = NULL;
2380 int ret;
2381 blkid_loff_t size;
2383 if (!device || !*device)
2384 return 0;
2386 ret = -1; /* will reset on success of all setup calls */
2388 pr = blkid_new_probe_from_filename(device);
2389 if (!pr)
2390 goto out;
2392 size = blkid_probe_get_size(pr);
2393 if (size < 0)
2394 goto out;
2396 /* nothing to overwrite on a 0-length device */
2397 if (size == 0) {
2398 ret = 0;
2399 goto out;
2402 ret = blkid_probe_enable_partitions(pr, 1);
2403 if (ret < 0)
2404 goto out;
2406 ret = blkid_do_fullprobe(pr);
2407 if (ret < 0)
2408 goto out;
2411 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2412 * but we want the exact opposite, so reverse the return value here.
2414 * In addition print some useful diagnostics about what actually is
2415 * on the device.
2417 if (ret) {
2418 ret = 0;
2419 goto out;
2422 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2423 fprintf(stderr,
2424 "%s appears to contain an existing "
2425 "filesystem (%s).\n", device, type);
2426 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2427 fprintf(stderr,
2428 "%s appears to contain a partition "
2429 "table (%s).\n", device, type);
2430 } else {
2431 fprintf(stderr,
2432 "%s appears to contain something weird "
2433 "according to blkid\n", device);
2435 ret = 1;
2437 out:
2438 if (pr)
2439 blkid_free_probe(pr);
2440 if (ret == -1)
2441 fprintf(stderr,
2442 "probe of %s failed, cannot detect "
2443 "existing filesystem.\n", device);
2444 return ret;
2447 static int group_profile_devs_min(u64 flag)
2449 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2450 case 0: /* single */
2451 case BTRFS_BLOCK_GROUP_DUP:
2452 return 1;
2453 case BTRFS_BLOCK_GROUP_RAID0:
2454 case BTRFS_BLOCK_GROUP_RAID1:
2455 case BTRFS_BLOCK_GROUP_RAID5:
2456 return 2;
2457 case BTRFS_BLOCK_GROUP_RAID6:
2458 return 3;
2459 case BTRFS_BLOCK_GROUP_RAID10:
2460 return 4;
2461 default:
2462 return -1;
2466 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2467 u64 dev_cnt, int mixed, int ssd)
2469 u64 allowed = 0;
2471 switch (dev_cnt) {
2472 default:
2473 case 4:
2474 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2475 case 3:
2476 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2477 case 2:
2478 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2479 BTRFS_BLOCK_GROUP_RAID5;
2480 break;
2481 case 1:
2482 allowed |= BTRFS_BLOCK_GROUP_DUP;
2485 if (dev_cnt > 1 &&
2486 ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
2487 fprintf(stderr,
2488 "ERROR: DUP is not allowed when FS has multiple devices\n");
2489 return 1;
2491 if (metadata_profile & ~allowed) {
2492 fprintf(stderr,
2493 "ERROR: unable to create FS with metadata profile %s "
2494 "(have %llu devices but %d devices are required)\n",
2495 btrfs_group_profile_str(metadata_profile), dev_cnt,
2496 group_profile_devs_min(metadata_profile));
2497 return 1;
2499 if (data_profile & ~allowed) {
2500 fprintf(stderr,
2501 "ERROR: unable to create FS with data profile %s "
2502 "(have %llu devices but %d devices are required)\n",
2503 btrfs_group_profile_str(data_profile), dev_cnt,
2504 group_profile_devs_min(data_profile));
2505 return 1;
2508 warning_on(!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP) && ssd,
2509 "DUP may not actually lead to 2 copies on the device, see manual page");
2511 return 0;
2514 int group_profile_max_safe_loss(u64 flags)
2516 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2517 case 0: /* single */
2518 case BTRFS_BLOCK_GROUP_DUP:
2519 case BTRFS_BLOCK_GROUP_RAID0:
2520 return 0;
2521 case BTRFS_BLOCK_GROUP_RAID1:
2522 case BTRFS_BLOCK_GROUP_RAID5:
2523 case BTRFS_BLOCK_GROUP_RAID10:
2524 return 1;
2525 case BTRFS_BLOCK_GROUP_RAID6:
2526 return 2;
2527 default:
2528 return -1;
2533 * Check if a device is suitable for btrfs
2534 * returns:
2535 * 1: something is wrong, an error is printed
2536 * 0: all is fine
2538 int test_dev_for_mkfs(char *file, int force_overwrite)
2540 int ret, fd;
2541 struct stat st;
2543 ret = is_swap_device(file);
2544 if (ret < 0) {
2545 fprintf(stderr, "ERROR: checking status of %s: %s\n", file,
2546 strerror(-ret));
2547 return 1;
2549 if (ret == 1) {
2550 fprintf(stderr, "ERROR: %s is a swap device\n", file);
2551 return 1;
2553 if (!force_overwrite) {
2554 if (check_overwrite(file)) {
2555 fprintf(stderr, "Use the -f option to force overwrite.\n");
2556 return 1;
2559 ret = check_mounted(file);
2560 if (ret < 0) {
2561 fprintf(stderr, "ERROR: checking mount status of %s: %s\n",
2562 file, strerror(-ret));
2563 return 1;
2565 if (ret == 1) {
2566 fprintf(stderr, "ERROR: %s is mounted\n", file);
2567 return 1;
2569 /* check if the device is busy */
2570 fd = open(file, O_RDWR|O_EXCL);
2571 if (fd < 0) {
2572 fprintf(stderr, "ERROR: unable to open %s: %s\n", file,
2573 strerror(errno));
2574 return 1;
2576 if (fstat(fd, &st)) {
2577 fprintf(stderr, "ERROR: unable to stat %s: %s\n", file,
2578 strerror(errno));
2579 close(fd);
2580 return 1;
2582 if (!S_ISBLK(st.st_mode)) {
2583 fprintf(stderr, "ERROR: %s is not a block device\n", file);
2584 close(fd);
2585 return 1;
2587 close(fd);
2588 return 0;
2591 int btrfs_scan_lblkid(void)
2593 int fd = -1;
2594 int ret;
2595 u64 num_devices;
2596 struct btrfs_fs_devices *tmp_devices;
2597 blkid_dev_iterate iter = NULL;
2598 blkid_dev dev = NULL;
2599 blkid_cache cache = NULL;
2600 char path[PATH_MAX];
2602 if (btrfs_scan_done)
2603 return 0;
2605 if (blkid_get_cache(&cache, NULL) < 0) {
2606 printf("ERROR: lblkid cache get failed\n");
2607 return 1;
2609 blkid_probe_all(cache);
2610 iter = blkid_dev_iterate_begin(cache);
2611 blkid_dev_set_search(iter, "TYPE", "btrfs");
2612 while (blkid_dev_next(iter, &dev) == 0) {
2613 dev = blkid_verify(cache, dev);
2614 if (!dev)
2615 continue;
2616 /* if we are here its definitely a btrfs disk*/
2617 strncpy_null(path, blkid_dev_devname(dev));
2619 fd = open(path, O_RDONLY);
2620 if (fd < 0) {
2621 printf("ERROR: could not open %s\n", path);
2622 continue;
2624 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2625 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2626 if (ret) {
2627 printf("ERROR: could not scan %s\n", path);
2628 close (fd);
2629 continue;
2632 close(fd);
2634 blkid_dev_iterate_end(iter);
2635 blkid_put_cache(cache);
2637 btrfs_scan_done = 1;
2639 return 0;
2642 int is_vol_small(char *file)
2644 int fd = -1;
2645 int e;
2646 struct stat st;
2647 u64 size;
2649 fd = open(file, O_RDONLY);
2650 if (fd < 0)
2651 return -errno;
2652 if (fstat(fd, &st) < 0) {
2653 e = -errno;
2654 close(fd);
2655 return e;
2657 size = btrfs_device_size(fd, &st);
2658 if (size == 0) {
2659 close(fd);
2660 return -1;
2662 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2663 close(fd);
2664 return 1;
2665 } else {
2666 close(fd);
2667 return 0;
2672 * This reads a line from the stdin and only returns non-zero if the
2673 * first whitespace delimited token is a case insensitive match with yes
2674 * or y.
2676 int ask_user(char *question)
2678 char buf[30] = {0,};
2679 char *saveptr = NULL;
2680 char *answer;
2682 printf("%s [y/N]: ", question);
2684 return fgets(buf, sizeof(buf) - 1, stdin) &&
2685 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2686 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2690 * For a given:
2691 * - file or directory return the containing tree root id
2692 * - subvolume return its own tree id
2693 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2694 * undefined and function returns -1
2696 int lookup_ino_rootid(int fd, u64 *rootid)
2698 struct btrfs_ioctl_ino_lookup_args args;
2699 int ret;
2701 memset(&args, 0, sizeof(args));
2702 args.treeid = 0;
2703 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2705 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2706 if (ret < 0) {
2707 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2708 strerror(errno));
2709 return ret;
2712 *rootid = args.treeid;
2714 return 0;
2718 * return 0 if a btrfs mount point is found
2719 * return 1 if a mount point is found but not btrfs
2720 * return <0 if something goes wrong
2722 int find_mount_root(const char *path, char **mount_root)
2724 FILE *mnttab;
2725 int fd;
2726 struct mntent *ent;
2727 int len;
2728 int ret;
2729 int not_btrfs = 1;
2730 int longest_matchlen = 0;
2731 char *longest_match = NULL;
2733 fd = open(path, O_RDONLY | O_NOATIME);
2734 if (fd < 0)
2735 return -errno;
2736 close(fd);
2738 mnttab = setmntent("/proc/self/mounts", "r");
2739 if (!mnttab)
2740 return -errno;
2742 while ((ent = getmntent(mnttab))) {
2743 len = strlen(ent->mnt_dir);
2744 if (strncmp(ent->mnt_dir, path, len) == 0) {
2745 /* match found and use the latest match */
2746 if (longest_matchlen <= len) {
2747 free(longest_match);
2748 longest_matchlen = len;
2749 longest_match = strdup(ent->mnt_dir);
2750 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2754 endmntent(mnttab);
2756 if (!longest_match)
2757 return -ENOENT;
2758 if (not_btrfs) {
2759 free(longest_match);
2760 return 1;
2763 ret = 0;
2764 *mount_root = realpath(longest_match, NULL);
2765 if (!*mount_root)
2766 ret = -errno;
2768 free(longest_match);
2769 return ret;
2772 int test_minimum_size(const char *file, u32 nodesize)
2774 int fd;
2775 struct stat statbuf;
2777 fd = open(file, O_RDONLY);
2778 if (fd < 0)
2779 return -errno;
2780 if (stat(file, &statbuf) < 0) {
2781 close(fd);
2782 return -errno;
2784 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
2785 close(fd);
2786 return 1;
2788 close(fd);
2789 return 0;
2793 * test if name is a correct subvolume name
2794 * this function return
2795 * 0-> name is not a correct subvolume name
2796 * 1-> name is a correct subvolume name
2798 int test_issubvolname(const char *name)
2800 return name[0] != '\0' && !strchr(name, '/') &&
2801 strcmp(name, ".") && strcmp(name, "..");
2805 * Test if path is a directory
2806 * Returns:
2807 * 0 - path exists but it is not a directory
2808 * 1 - path exists and it is a directory
2809 * < 0 - error
2811 int test_isdir(const char *path)
2813 struct stat st;
2814 int ret;
2816 ret = stat(path, &st);
2817 if (ret < 0)
2818 return -errno;
2820 return !!S_ISDIR(st.st_mode);
2823 void units_set_mode(unsigned *units, unsigned mode)
2825 unsigned base = *units & UNITS_MODE_MASK;
2827 *units = base | mode;
2830 void units_set_base(unsigned *units, unsigned base)
2832 unsigned mode = *units & ~UNITS_MODE_MASK;
2834 *units = base | mode;
2837 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2839 int level;
2841 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2842 if (!path->nodes[level])
2843 break;
2844 if (path->slots[level] + 1 >=
2845 btrfs_header_nritems(path->nodes[level]))
2846 continue;
2847 if (level == 0)
2848 btrfs_item_key_to_cpu(path->nodes[level], key,
2849 path->slots[level] + 1);
2850 else
2851 btrfs_node_key_to_cpu(path->nodes[level], key,
2852 path->slots[level] + 1);
2853 return 0;
2855 return 1;
2858 char* btrfs_group_type_str(u64 flag)
2860 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2861 BTRFS_SPACE_INFO_GLOBAL_RSV;
2863 switch (flag & mask) {
2864 case BTRFS_BLOCK_GROUP_DATA:
2865 return "Data";
2866 case BTRFS_BLOCK_GROUP_SYSTEM:
2867 return "System";
2868 case BTRFS_BLOCK_GROUP_METADATA:
2869 return "Metadata";
2870 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2871 return "Data+Metadata";
2872 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2873 return "GlobalReserve";
2874 default:
2875 return "unknown";
2879 char* btrfs_group_profile_str(u64 flag)
2881 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2882 case 0:
2883 return "single";
2884 case BTRFS_BLOCK_GROUP_RAID0:
2885 return "RAID0";
2886 case BTRFS_BLOCK_GROUP_RAID1:
2887 return "RAID1";
2888 case BTRFS_BLOCK_GROUP_RAID5:
2889 return "RAID5";
2890 case BTRFS_BLOCK_GROUP_RAID6:
2891 return "RAID6";
2892 case BTRFS_BLOCK_GROUP_DUP:
2893 return "DUP";
2894 case BTRFS_BLOCK_GROUP_RAID10:
2895 return "RAID10";
2896 default:
2897 return "unknown";
2901 u64 disk_size(char *path)
2903 struct statfs sfs;
2905 if (statfs(path, &sfs) < 0)
2906 return 0;
2907 else
2908 return sfs.f_bsize * sfs.f_blocks;
2911 u64 get_partition_size(char *dev)
2913 u64 result;
2914 int fd = open(dev, O_RDONLY);
2916 if (fd < 0)
2917 return 0;
2918 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2919 close(fd);
2920 return 0;
2922 close(fd);
2924 return result;
2927 int btrfs_tree_search2_ioctl_supported(int fd)
2929 struct btrfs_ioctl_search_args_v2 *args2;
2930 struct btrfs_ioctl_search_key *sk;
2931 int args2_size = 1024;
2932 char args2_buf[args2_size];
2933 int ret;
2934 static int v2_supported = -1;
2936 if (v2_supported != -1)
2937 return v2_supported;
2939 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2940 sk = &(args2->key);
2943 * Search for the extent tree item in the root tree.
2945 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2946 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2947 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2948 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2949 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2950 sk->min_offset = 0;
2951 sk->max_offset = (u64)-1;
2952 sk->min_transid = 0;
2953 sk->max_transid = (u64)-1;
2954 sk->nr_items = 1;
2955 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2956 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2957 if (ret == -EOPNOTSUPP)
2958 v2_supported = 0;
2959 else if (ret == 0)
2960 v2_supported = 1;
2961 else
2962 return ret;
2964 return v2_supported;
2967 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
2969 if (nodesize < sectorsize) {
2970 fprintf(stderr,
2971 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2972 nodesize, sectorsize);
2973 return -1;
2974 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2975 fprintf(stderr,
2976 "ERROR: Illegal nodesize %u (larger than %u)\n",
2977 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2978 return -1;
2979 } else if (nodesize & (sectorsize - 1)) {
2980 fprintf(stderr,
2981 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2982 nodesize, sectorsize);
2983 return -1;
2984 } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
2985 nodesize != sectorsize) {
2986 fprintf(stderr,
2987 "ERROR: Illegal nodesize %u (not equal to %u for mixed block group)\n",
2988 nodesize, sectorsize);
2989 return -1;
2991 return 0;
2995 * Copy a path argument from SRC to DEST and check the SRC length if it's at
2996 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
2997 * the buffer.
2998 * The destination buffer is zero terminated.
2999 * Return < 0 for error, 0 otherwise.
3001 int arg_copy_path(char *dest, const char *src, int destlen)
3003 size_t len = strlen(src);
3005 if (len >= PATH_MAX || len >= destlen)
3006 return -ENAMETOOLONG;
3008 __strncpy__null(dest, src, destlen);
3010 return 0;
3013 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
3015 unsigned int unit_mode = UNITS_DEFAULT;
3016 int arg_i;
3017 int arg_end;
3019 for (arg_i = 0; arg_i < *argc; arg_i++) {
3020 if (!strcmp(argv[arg_i], "--raw")) {
3021 unit_mode = UNITS_RAW;
3022 argv[arg_i] = NULL;
3023 continue;
3025 if (!strcmp(argv[arg_i], "--human-readable")) {
3026 unit_mode = UNITS_HUMAN_BINARY;
3027 argv[arg_i] = NULL;
3028 continue;
3031 if (!strcmp(argv[arg_i], "--iec")) {
3032 units_set_mode(&unit_mode, UNITS_BINARY);
3033 argv[arg_i] = NULL;
3034 continue;
3036 if (!strcmp(argv[arg_i], "--si")) {
3037 units_set_mode(&unit_mode, UNITS_DECIMAL);
3038 argv[arg_i] = NULL;
3039 continue;
3042 if (!strcmp(argv[arg_i], "--kbytes")) {
3043 units_set_base(&unit_mode, UNITS_KBYTES);
3044 argv[arg_i] = NULL;
3045 continue;
3047 if (!strcmp(argv[arg_i], "--mbytes")) {
3048 units_set_base(&unit_mode, UNITS_MBYTES);
3049 argv[arg_i] = NULL;
3050 continue;
3052 if (!strcmp(argv[arg_i], "--gbytes")) {
3053 units_set_base(&unit_mode, UNITS_GBYTES);
3054 argv[arg_i] = NULL;
3055 continue;
3057 if (!strcmp(argv[arg_i], "--tbytes")) {
3058 units_set_base(&unit_mode, UNITS_TBYTES);
3059 argv[arg_i] = NULL;
3060 continue;
3063 if (!df_mode)
3064 continue;
3066 if (!strcmp(argv[arg_i], "-b")) {
3067 unit_mode = UNITS_RAW;
3068 argv[arg_i] = NULL;
3069 continue;
3071 if (!strcmp(argv[arg_i], "-h")) {
3072 unit_mode = UNITS_HUMAN_BINARY;
3073 argv[arg_i] = NULL;
3074 continue;
3076 if (!strcmp(argv[arg_i], "-H")) {
3077 unit_mode = UNITS_HUMAN_DECIMAL;
3078 argv[arg_i] = NULL;
3079 continue;
3081 if (!strcmp(argv[arg_i], "-k")) {
3082 units_set_base(&unit_mode, UNITS_KBYTES);
3083 argv[arg_i] = NULL;
3084 continue;
3086 if (!strcmp(argv[arg_i], "-m")) {
3087 units_set_base(&unit_mode, UNITS_MBYTES);
3088 argv[arg_i] = NULL;
3089 continue;
3091 if (!strcmp(argv[arg_i], "-g")) {
3092 units_set_base(&unit_mode, UNITS_GBYTES);
3093 argv[arg_i] = NULL;
3094 continue;
3096 if (!strcmp(argv[arg_i], "-t")) {
3097 units_set_base(&unit_mode, UNITS_TBYTES);
3098 argv[arg_i] = NULL;
3099 continue;
3103 for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
3104 if (!argv[arg_i])
3105 continue;
3106 argv[arg_end] = argv[arg_i];
3107 arg_end++;
3110 *argc = arg_end;
3112 return unit_mode;
3115 int string_is_numerical(const char *str)
3117 if (!(*str >= '0' && *str <= '9'))
3118 return 0;
3119 while (*str >= '0' && *str <= '9')
3120 str++;
3121 if (*str != '\0')
3122 return 0;
3123 return 1;
3127 * Preprocess @argv with getopt_long to reorder options and consume the "--"
3128 * option separator.
3129 * Unknown short and long options are reported, optionally the @usage is printed
3130 * before exit.
3132 void clean_args_no_options(int argc, char *argv[], const char * const *usagestr)
3134 static const struct option long_options[] = {
3135 {NULL, 0, NULL, 0}
3138 while (1) {
3139 int c = getopt_long(argc, argv, "", long_options, NULL);
3141 if (c < 0)
3142 break;
3144 switch (c) {
3145 default:
3146 if (usagestr)
3147 usage(usagestr);