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btrfs-progs: extent-tree: Add add_merge_cache_extent function
[btrfs-progs-unstable/devel.git] / utils.c
blob32e6e399720485de6493206fb06e49abd64f1c16
1 /*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 * Copyright (C) 2008 Morey Roof. All rights reserved.
4 *
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.
8 *
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.
13 *
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.
18 */
19
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
41 #include "kerncompat.h"
42 #include "radix-tree.h"
43 #include "ctree.h"
44 #include "disk-io.h"
45 #include "transaction.h"
46 #include "crc32c.h"
47 #include "utils.h"
48 #include "volumes.h"
49 #include "ioctl.h"
50
51 #ifndef BLKDISCARD
52 #define BLKDISCARD _IO(0x12,119)
53 #endif
54
55 static int btrfs_scan_done = 0;
56
57 static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
58
59 const char *get_argv0_buf(void)
60 {
61 return argv0_buf;
62 }
63
64 void fixup_argv0(char **argv, const char *token)
65 {
66 int len = strlen(argv0_buf);
67
68 snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
69 argv[0] = argv0_buf;
70 }
71
72 void set_argv0(char **argv)
73 {
74 strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
75 argv0_buf[sizeof(argv0_buf) - 1] = 0;
76 }
77
78 int check_argc_exact(int nargs, int expected)
79 {
80 if (nargs < expected)
81 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
82 if (nargs > expected)
83 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
84
85 return nargs != expected;
86 }
87
88 int check_argc_min(int nargs, int expected)
89 {
90 if (nargs < expected) {
91 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
92 return 1;
93 }
94
95 return 0;
96 }
97
98 int check_argc_max(int nargs, int expected)
99 {
100 if (nargs > expected) {
101 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
102 return 1;
103 }
104
105 return 0;
106 }
107
108
109 /*
110 * Discard the given range in one go
111 */
112 static int discard_range(int fd, u64 start, u64 len)
113 {
114 u64 range[2] = { start, len };
115
116 if (ioctl(fd, BLKDISCARD, &range) < 0)
117 return errno;
118 return 0;
119 }
120
121 /*
122 * Discard blocks in the given range in 1G chunks, the process is interruptible
123 */
124 static int discard_blocks(int fd, u64 start, u64 len)
125 {
126 while (len > 0) {
127 /* 1G granularity */
128 u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
129 int ret;
130
131 ret = discard_range(fd, start, chunk_size);
132 if (ret)
133 return ret;
134 len -= chunk_size;
135 start += chunk_size;
136 }
137
138 return 0;
139 }
140
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,
148 };
149
150 int test_uuid_unique(char *fs_uuid)
151 {
152 int unique = 1;
153 blkid_dev_iterate iter = NULL;
154 blkid_dev dev = NULL;
155 blkid_cache cache = NULL;
156
157 if (blkid_get_cache(&cache, 0) < 0) {
158 printf("ERROR: lblkid cache get failed\n");
159 return 1;
160 }
161 blkid_probe_all(cache);
162 iter = blkid_dev_iterate_begin(cache);
163 blkid_dev_set_search(iter, "UUID", fs_uuid);
164
165 while (blkid_dev_next(iter, &dev) == 0) {
166 dev = blkid_verify(cache, dev);
167 if (dev) {
168 unique = 0;
169 break;
170 }
171 }
172
173 blkid_dev_iterate_end(iter);
174 blkid_put_cache(cache);
175
176 return unique;
177 }
178
179 /*
180 * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
181 */
182 int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
183 {
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];
194 u8 *ptr;
195 int i;
196 int ret;
197 u32 itemoff;
198 u32 nritems = 0;
199 u64 first_free;
200 u64 ref_root;
201 u32 array_size;
202 u32 item_size;
203 int skinny_metadata = !!(cfg->features &
204 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
205 u64 num_bytes;
206
207 buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
208 if (!buf)
209 return -ENOMEM;
210
211 first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
212 first_free &= ~((u64)cfg->sectorsize - 1);
213
214 memset(&super, 0, sizeof(super));
215
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",
220 cfg->fs_uuid);
221 ret = -EINVAL;
222 goto out;
223 }
224 if (!test_uuid_unique(cfg->fs_uuid)) {
225 fprintf(stderr, "non-unique UUID: %s\n", cfg->fs_uuid);
226 ret = -EBUSY;
227 goto out;
228 }
229 } else {
230 uuid_generate(super.fsid);
231 if (cfg->fs_uuid)
232 uuid_unparse(super.fsid, cfg->fs_uuid);
233 }
234 uuid_generate(super.dev_item.uuid);
235 uuid_generate(chunk_tree_uuid);
236
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);
253 if (cfg->label)
254 strncpy(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
255
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(),
265 BTRFS_FSID_SIZE);
266
267 write_extent_buffer(buf, chunk_tree_uuid,
268 btrfs_header_chunk_tree_uuid(buf),
269 BTRFS_UUID_SIZE);
270
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);
282
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);
286 nritems = 0;
287
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),
294 sizeof(root_item));
295 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
296 nritems), sizeof(root_item));
297 nritems++;
298
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),
305 sizeof(root_item));
306 write_extent_buffer(buf, &root_item,
307 btrfs_item_ptr_offset(buf, nritems),
308 sizeof(root_item));
309 nritems++;
310
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),
317 sizeof(root_item));
318 write_extent_buffer(buf, &root_item,
319 btrfs_item_ptr_offset(buf, nritems),
320 sizeof(root_item));
321 nritems++;
322
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),
329 sizeof(root_item));
330 write_extent_buffer(buf, &root_item,
331 btrfs_item_ptr_offset(buf, nritems),
332 sizeof(root_item));
333 nritems++;
334
335
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);
340 goto out;
341 }
342
343 /* create the items for the extent tree */
344 memset(buf->data + sizeof(struct btrfs_header), 0,
345 cfg->nodesize - sizeof(struct btrfs_header));
346 nritems = 0;
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);
352
353 BUG_ON(cfg->blocks[i] < first_free);
354 BUG_ON(cfg->blocks[i] < cfg->blocks[i - 1]);
355
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);
363 } else {
364 btrfs_set_disk_key_type(&disk_key,
365 BTRFS_EXTENT_ITEM_KEY);
366 btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
367 }
368 btrfs_set_item_key(buf, &disk_key, nritems);
369 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
370 itemoff);
371 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
372 item_size);
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);
379 nritems++;
380
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),
388 itemoff);
389 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
390 nritems++;
391 }
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);
399 goto out;
400 }
401
402 /* create the chunk tree */
403 memset(buf->data + sizeof(struct btrfs_header), 0,
404 cfg->nodesize - sizeof(struct btrfs_header));
405 nritems = 0;
406 item_size = sizeof(*dev_item);
407 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
408
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);
416
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);
427
428 write_extent_buffer(buf, super.dev_item.uuid,
429 (unsigned long)btrfs_device_uuid(dev_item),
430 BTRFS_UUID_SIZE);
431 write_extent_buffer(buf, super.fsid,
432 (unsigned long)btrfs_device_fsid(dev_item),
433 BTRFS_UUID_SIZE);
434 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
435 sizeof(*dev_item));
436
437 nritems++;
438 item_size = btrfs_chunk_item_size(1);
439 itemoff = itemoff - item_size;
440
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);
448
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);
460 nritems++;
461
462 write_extent_buffer(buf, super.dev_item.uuid,
463 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
464 BTRFS_UUID_SIZE);
465
466 /* copy the key for the chunk to the system array */
467 ptr = super.sys_chunk_array;
468 array_size = sizeof(disk_key);
469
470 memcpy(ptr, &disk_key, sizeof(disk_key));
471 ptr += sizeof(disk_key);
472
473 /* copy the chunk to the system array */
474 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
475 array_size += item_size;
476 ptr += item_size;
477 btrfs_set_super_sys_array_size(&super, array_size);
478
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);
486 goto out;
487 }
488
489 /* create the device tree */
490 memset(buf->data + sizeof(struct btrfs_header), 0,
491 cfg->nodesize - sizeof(struct btrfs_header));
492 nritems = 0;
493 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
494 sizeof(struct btrfs_dev_extent);
495
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);
509
510 write_extent_buffer(buf, chunk_tree_uuid,
511 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
512 BTRFS_UUID_SIZE);
513
514 btrfs_set_dev_extent_length(buf, dev_extent,
515 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
516 nritems++;
517
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);
525 goto out;
526 }
527
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);
538 goto out;
539 }
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);
550 goto out;
551 }
552
553 /* and write out the super block */
554 BUG_ON(sizeof(super) > cfg->sectorsize);
555 memset(buf->data, 0, BTRFS_SUPER_INFO_SIZE);
556 memcpy(buf->data, &super, sizeof(super));
557 buf->len = BTRFS_SUPER_INFO_SIZE;
558 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
559 ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, cfg->blocks[0]);
560 if (ret != BTRFS_SUPER_INFO_SIZE) {
561 ret = (ret < 0 ? -errno : -EIO);
562 goto out;
563 }
564
565 ret = 0;
566
567 out:
568 free(buf);
569 return ret;
570 }
571
572 static const struct btrfs_fs_feature {
573 const char *name;
574 u64 flag;
575 const char *desc;
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 }
589 };
590
591 static int parse_one_fs_feature(const char *name, u64 *flags)
592 {
593 int i;
594 int found = 0;
595
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;
600 found = 1;
601 } else if (!strcmp(mkfs_features[i].name, name)) {
602 *flags |= mkfs_features[i].flag;
603 found = 1;
604 }
605 }
606
607 return !found;
608 }
609
610 void btrfs_parse_features_to_string(char *buf, u64 flags)
611 {
612 int i;
613
614 buf[0] = 0;
615
616 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
617 if (flags & mkfs_features[i].flag) {
618 if (*buf)
619 strcat(buf, ", ");
620 strcat(buf, mkfs_features[i].name);
621 }
622 }
623 }
624
625 void btrfs_process_fs_features(u64 flags)
626 {
627 int i;
628
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);
634 }
635 }
636 }
637
638 void btrfs_list_all_fs_features(u64 mask_disallowed)
639 {
640 int i;
641
642 fprintf(stderr, "Filesystem features available:\n");
643 for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
644 char *is_default = "";
645
646 if (mkfs_features[i].flag & mask_disallowed)
647 continue;
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,
654 is_default);
655 }
656 }
657
658 /*
659 * Return NULL if all features were parsed fine, otherwise return the name of
660 * the first unparsed.
661 */
662 char* btrfs_parse_fs_features(char *namelist, u64 *flags)
663 {
664 char *this_char;
665 char *save_ptr = NULL; /* Satisfy static checkers */
666
667 for (this_char = strtok_r(namelist, ",", &save_ptr);
668 this_char != NULL;
669 this_char = strtok_r(NULL, ",", &save_ptr)) {
670 if (parse_one_fs_feature(this_char, flags))
671 return this_char;
672 }
673
674 return NULL;
675 }
676
677 u64 btrfs_device_size(int fd, struct stat *st)
678 {
679 u64 size;
680 if (S_ISREG(st->st_mode)) {
681 return st->st_size;
682 }
683 if (!S_ISBLK(st->st_mode)) {
684 return 0;
685 }
686 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
687 return size;
688 }
689 return 0;
690 }
691
692 static int zero_blocks(int fd, off_t start, size_t len)
693 {
694 char *buf = malloc(len);
695 int ret = 0;
696 ssize_t written;
697
698 if (!buf)
699 return -ENOMEM;
700 memset(buf, 0, len);
701 written = pwrite(fd, buf, len, start);
702 if (written != len)
703 ret = -EIO;
704 free(buf);
705 return ret;
706 }
707
708 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
709
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)
712 {
713 off_t end = max(start, start + len);
714
715 #ifdef __sparc__
716 /* and don't overwrite the disk labels on sparc */
717 start = max(start, 1024);
718 end = max(end, 1024);
719 #endif
720
721 start = min_t(u64, start, dev_size);
722 end = min_t(u64, end, dev_size);
723
724 return zero_blocks(fd, start, end - start);
725 }
726
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,
730 u32 sectorsize)
731 {
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;
736 char *buf = NULL;
737 u64 fs_total_bytes;
738 u64 num_devs;
739 int ret;
740
741 device_total_bytes = (device_total_bytes / sectorsize) * sectorsize;
742
743 device = kzalloc(sizeof(*device), GFP_NOFS);
744 if (!device)
745 goto err_nomem;
746 buf = kzalloc(sectorsize, GFP_NOFS);
747 if (!buf)
748 goto err_nomem;
749 BUG_ON(sizeof(*disk_super) > sectorsize);
750
751 disk_super = (struct btrfs_super_block *)buf;
752 dev_item = &disk_super->dev_item;
753
754 uuid_generate(device->uuid);
755 device->devid = 0;
756 device->type = 0;
757 device->io_width = io_width;
758 device->io_align = io_align;
759 device->sector_size = sectorsize;
760 device->fd = fd;
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);
767 if (!device->name)
768 goto err_nomem;
769
770 INIT_LIST_HEAD(&device->dev_list);
771 ret = btrfs_add_device(trans, root, device);
772 BUG_ON(ret);
773
774 fs_total_bytes = btrfs_super_total_bytes(super) + device_total_bytes;
775 btrfs_set_super_total_bytes(super, fs_total_bytes);
776
777 num_devs = btrfs_super_num_devices(super) + 1;
778 btrfs_set_super_num_devices(super, num_devs);
779
780 memcpy(disk_super, super, sizeof(*disk_super));
781
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);
791
792 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
793 BUG_ON(ret != sectorsize);
794
795 kfree(buf);
796 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
797 device->fs_devices = root->fs_info->fs_devices;
798 return 0;
799
800 err_nomem:
801 kfree(device);
802 kfree(buf);
803 return -ENOMEM;
804 }
805
806 static int btrfs_wipe_existing_sb(int fd)
807 {
808 const char *off = NULL;
809 size_t len = 0;
810 loff_t offset;
811 char buf[BUFSIZ];
812 int ret = 0;
813 blkid_probe pr = NULL;
814
815 pr = blkid_new_probe();
816 if (!pr)
817 return -1;
818
819 if (blkid_probe_set_device(pr, fd, 0, 0)) {
820 ret = -1;
821 goto out;
822 }
823
824 ret = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
825 if (!ret)
826 ret = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
827
828 if (ret || len == 0 || off == NULL) {
829 /*
830 * If lookup fails, the probe did not find any values, eg. for
831 * a file image or a loop device. Soft error.
832 */
833 ret = 1;
834 goto out;
835 }
836
837 offset = strtoll(off, NULL, 10);
838 if (len > sizeof(buf))
839 len = sizeof(buf);
840
841 memset(buf, 0, len);
842 ret = pwrite(fd, buf, len, offset);
843 if (ret != len) {
844 fprintf(stderr, "ERROR: cannot wipe existing superblock\n");
845 ret = -1;
846 }
847 fsync(fd);
848
849 out:
850 blkid_free_probe(pr);
851 return ret;
852 }
853
854 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
855 u64 max_block_count, int discard)
856 {
857 u64 block_count;
858 struct stat st;
859 int i, ret;
860
861 ret = fstat(fd, &st);
862 if (ret < 0) {
863 fprintf(stderr, "unable to stat %s\n", file);
864 return 1;
865 }
866
867 block_count = btrfs_device_size(fd, &st);
868 if (block_count == 0) {
869 fprintf(stderr, "unable to find %s size\n", file);
870 return 1;
871 }
872 if (max_block_count)
873 block_count = min(block_count, max_block_count);
874
875 if (discard) {
876 /*
877 * We intentionally ignore errors from the discard ioctl. It
878 * is not necessary for the mkfs functionality but just an
879 * optimization.
880 */
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);
885 }
886 }
887
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);
895
896 if (ret < 0) {
897 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
898 file, strerror(-ret));
899 return 1;
900 }
901
902 ret = btrfs_wipe_existing_sb(fd);
903 if (ret < 0) {
904 fprintf(stderr, "ERROR: cannot wipe superblocks on '%s'\n",
905 file);
906 return 1;
907 }
908
909 *block_count_ret = block_count;
910 return 0;
911 }
912
913 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
914 struct btrfs_root *root, u64 objectid)
915 {
916 int ret;
917 struct btrfs_inode_item inode_item;
918 time_t now = time(NULL);
919
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);
934
935 if (root->fs_info->tree_root == root)
936 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
937
938 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
939 if (ret)
940 goto error;
941
942 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
943 if (ret)
944 goto error;
945
946 btrfs_set_root_dirid(&root->root_item, objectid);
947 ret = 0;
948 error:
949 return ret;
950 }
951
952 /*
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
956 */
957 int is_block_device(const char *path)
958 {
959 struct stat statbuf;
960
961 if (stat(path, &statbuf) < 0)
962 return -errno;
963
964 return !!S_ISBLK(statbuf.st_mode);
965 }
966
967 /*
968 * check if given path is a mount point
969 * return 1 if yes. 0 if no. -1 for error
970 */
971 int is_mount_point(const char *path)
972 {
973 FILE *f;
974 struct mntent *mnt;
975 int ret = 0;
976
977 f = setmntent("/proc/self/mounts", "r");
978 if (f == NULL)
979 return -1;
980
981 while ((mnt = getmntent(f)) != NULL) {
982 if (strcmp(mnt->mnt_dir, path))
983 continue;
984 ret = 1;
985 break;
986 }
987 endmntent(f);
988 return ret;
989 }
990
991 static int is_reg_file(const char *path)
992 {
993 struct stat statbuf;
994
995 if (stat(path, &statbuf) < 0)
996 return -errno;
997 return S_ISREG(statbuf.st_mode);
998 }
999
1000 /*
1001 * This function checks if the given input parameter is
1002 * an uuid or a path
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
1008 */
1009 int check_arg_type(const char *input)
1010 {
1011 uuid_t uuid;
1012 char path[PATH_MAX];
1013
1014 if (!input)
1015 return -EINVAL;
1016
1017 if (realpath(input, path)) {
1018 if (is_block_device(path) == 1)
1019 return BTRFS_ARG_BLKDEV;
1020
1021 if (is_mount_point(path) == 1)
1022 return BTRFS_ARG_MNTPOINT;
1023
1024 if (is_reg_file(path))
1025 return BTRFS_ARG_REG;
1026
1027 return BTRFS_ARG_UNKNOWN;
1028 }
1029
1030 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
1031 !uuid_parse(input, uuid))
1032 return BTRFS_ARG_UUID;
1033
1034 return BTRFS_ARG_UNKNOWN;
1035 }
1036
1037 /*
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.
1042 */
1043 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
1044 {
1045 int ret;
1046 int fd = -1;
1047
1048 ret = is_block_device(dev);
1049 if (ret <= 0) {
1050 if (!ret) {
1051 fprintf(stderr, "%s is not a block device\n", dev);
1052 ret = -EINVAL;
1053 } else {
1054 fprintf(stderr, "Could not check %s: %s\n",
1055 dev, strerror(-ret));
1056 }
1057 goto out;
1058 }
1059
1060 fd = open(dev, O_RDONLY);
1061 if (fd < 0) {
1062 ret = -errno;
1063 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
1064 goto out;
1065 }
1066
1067 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
1068 if (!ret) {
1069 ret = -EINVAL;
1070 } else { /* mounted, all good */
1071 ret = 0;
1072 }
1073 out:
1074 if (fd != -1)
1075 close(fd);
1076 return ret;
1077 }
1078
1079 /*
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.
1083 *
1084 * On error, return -1, errno should be set.
1085 */
1086 int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
1087 {
1088 char mp[PATH_MAX];
1089 int ret;
1090
1091 if (is_block_device(path)) {
1092 ret = get_btrfs_mount(path, mp, sizeof(mp));
1093 if (ret < 0) {
1094 /* not a mounted btrfs dev */
1095 error_on(verbose, "'%s' is not a mounted btrfs device",
1096 path);
1097 errno = EINVAL;
1098 return -1;
1099 }
1100 ret = open_file_or_dir(mp, dirstream);
1101 error_on(verbose && ret < 0, "can't access '%s': %s",
1102 path, strerror(errno));
1103 } else {
1104 ret = btrfs_open_dir(path, dirstream, 1);
1105 }
1106
1107 return ret;
1108 }
1109
1110 /*
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
1114 */
1115 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
1116 {
1117 struct statfs stfs;
1118 struct stat st;
1119 int ret;
1120
1121 if (statfs(path, &stfs) != 0) {
1122 if (verbose)
1123 fprintf(stderr,
1124 "ERROR: can't access '%s': %s\n",
1125 path, strerror(errno));
1126 return -1;
1127 }
1128
1129 if (stfs.f_type != BTRFS_SUPER_MAGIC) {
1130 if (verbose)
1131 fprintf(stderr,
1132 "ERROR: not a btrfs filesystem: %s\n",
1133 path);
1134 return -2;
1135 }
1136
1137 if (stat(path, &st) != 0) {
1138 if (verbose)
1139 fprintf(stderr,
1140 "ERROR: can't access '%s': %s\n",
1141 path, strerror(errno));
1142 return -1;
1143 }
1144
1145 if (!S_ISDIR(st.st_mode)) {
1146 if (verbose)
1147 fprintf(stderr,
1148 "ERROR: not a directory: %s\n",
1149 path);
1150 return -3;
1151 }
1152
1153 ret = open_file_or_dir(path, dirstream);
1154 if (ret < 0) {
1155 if (verbose)
1156 fprintf(stderr,
1157 "ERROR: can't access '%s': %s\n",
1158 path, strerror(errno));
1159 }
1160
1161 return ret;
1162 }
1163
1164 /* checks if a device is a loop device */
1165 static int is_loop_device (const char* device) {
1166 struct stat statbuf;
1167
1168 if(stat(device, &statbuf) < 0)
1169 return -errno;
1170
1171 return (S_ISBLK(statbuf.st_mode) &&
1172 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
1173 }
1174
1175 /*
1176 * Takes a loop device path (e.g. /dev/loop0) and returns
1177 * the associated file (e.g. /images/my_btrfs.img) using
1178 * loopdev API
1179 */
1180 static int resolve_loop_device_with_loopdev(const char* loop_dev, char* loop_file)
1181 {
1182 int fd;
1183 int ret;
1184 struct loop_info64 lo64;
1185
1186 fd = open(loop_dev, O_RDONLY | O_NONBLOCK);
1187 if (fd < 0)
1188 return -errno;
1189 ret = ioctl(fd, LOOP_GET_STATUS64, &lo64);
1190 if (ret < 0) {
1191 ret = -errno;
1192 goto out;
1193 }
1194
1195 memcpy(loop_file, lo64.lo_file_name, sizeof(lo64.lo_file_name));
1196 loop_file[sizeof(lo64.lo_file_name)] = 0;
1197
1198 out:
1199 close(fd);
1200
1201 return ret;
1202 }
1203
1204 /* Takes a loop device path (e.g. /dev/loop0) and returns
1205 * the associated file (e.g. /images/my_btrfs.img) */
1206 static int resolve_loop_device(const char* loop_dev, char* loop_file,
1207 int max_len)
1208 {
1209 int ret;
1210 FILE *f;
1211 char fmt[20];
1212 char p[PATH_MAX];
1213 char real_loop_dev[PATH_MAX];
1214
1215 if (!realpath(loop_dev, real_loop_dev))
1216 return -errno;
1217 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
1218 if (!(f = fopen(p, "r"))) {
1219 if (errno == ENOENT)
1220 /*
1221 * It's possibly a partitioned loop device, which is
1222 * resolvable with loopdev API.
1223 */
1224 return resolve_loop_device_with_loopdev(loop_dev, loop_file);
1225 return -errno;
1226 }
1227
1228 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
1229 ret = fscanf(f, fmt, loop_file);
1230 fclose(f);
1231 if (ret == EOF)
1232 return -errno;
1233
1234 return 0;
1235 }
1236
1237 /*
1238 * Checks whether a and b are identical or device
1239 * files associated with the same block device
1240 */
1241 static int is_same_blk_file(const char* a, const char* b)
1242 {
1243 struct stat st_buf_a, st_buf_b;
1244 char real_a[PATH_MAX];
1245 char real_b[PATH_MAX];
1246
1247 if (!realpath(a, real_a))
1248 strncpy_null(real_a, a);
1249
1250 if (!realpath(b, real_b))
1251 strncpy_null(real_b, b);
1252
1253 /* Identical path? */
1254 if (strcmp(real_a, real_b) == 0)
1255 return 1;
1256
1257 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
1258 if (errno == ENOENT)
1259 return 0;
1260 return -errno;
1261 }
1262
1263 /* Same blockdevice? */
1264 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
1265 st_buf_a.st_rdev == st_buf_b.st_rdev) {
1266 return 1;
1267 }
1268
1269 /* Hardlink? */
1270 if (st_buf_a.st_dev == st_buf_b.st_dev &&
1271 st_buf_a.st_ino == st_buf_b.st_ino) {
1272 return 1;
1273 }
1274
1275 return 0;
1276 }
1277
1278 /* checks if a and b are identical or device
1279 * files associated with the same block device or
1280 * if one file is a loop device that uses the other
1281 * file.
1282 */
1283 static int is_same_loop_file(const char* a, const char* b)
1284 {
1285 char res_a[PATH_MAX];
1286 char res_b[PATH_MAX];
1287 const char* final_a = NULL;
1288 const char* final_b = NULL;
1289 int ret;
1290
1291 /* Resolve a if it is a loop device */
1292 if((ret = is_loop_device(a)) < 0) {
1293 if (ret == -ENOENT)
1294 return 0;
1295 return ret;
1296 } else if (ret) {
1297 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1298 if (ret < 0) {
1299 if (errno != EPERM)
1300 return ret;
1301 } else {
1302 final_a = res_a;
1303 }
1304 } else {
1305 final_a = a;
1306 }
1307
1308 /* Resolve b if it is a loop device */
1309 if ((ret = is_loop_device(b)) < 0) {
1310 if (ret == -ENOENT)
1311 return 0;
1312 return ret;
1313 } else if (ret) {
1314 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1315 if (ret < 0) {
1316 if (errno != EPERM)
1317 return ret;
1318 } else {
1319 final_b = res_b;
1320 }
1321 } else {
1322 final_b = b;
1323 }
1324
1325 return is_same_blk_file(final_a, final_b);
1326 }
1327
1328 /* Checks if a file exists and is a block or regular file*/
1329 static int is_existing_blk_or_reg_file(const char* filename)
1330 {
1331 struct stat st_buf;
1332
1333 if(stat(filename, &st_buf) < 0) {
1334 if(errno == ENOENT)
1335 return 0;
1336 else
1337 return -errno;
1338 }
1339
1340 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1341 }
1342
1343 /* Checks if a file is used (directly or indirectly via a loop device)
1344 * by a device in fs_devices
1345 */
1346 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1347 const char* file)
1348 {
1349 int ret;
1350 struct list_head *head;
1351 struct list_head *cur;
1352 struct btrfs_device *device;
1353
1354 head = &fs_devices->devices;
1355 list_for_each(cur, head) {
1356 device = list_entry(cur, struct btrfs_device, dev_list);
1357
1358 if((ret = is_same_loop_file(device->name, file)))
1359 return ret;
1360 }
1361
1362 return 0;
1363 }
1364
1365 /*
1366 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1367 * Returns NULL on invalid input or malloc failure; Other failures
1368 * will be handled by the caller using the input pathame.
1369 */
1370 char *canonicalize_dm_name(const char *ptname)
1371 {
1372 FILE *f;
1373 size_t sz;
1374 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1375
1376 if (!ptname || !*ptname)
1377 return NULL;
1378
1379 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1380 if (!(f = fopen(path, "r")))
1381 return NULL;
1382
1383 /* read <name>\n from sysfs */
1384 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1385 name[sz - 1] = '\0';
1386 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1387
1388 if (access(path, F_OK) == 0)
1389 res = strdup(path);
1390 }
1391 fclose(f);
1392 return res;
1393 }
1394
1395 /*
1396 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1397 * to a device mapper pathname.
1398 * Returns NULL on invalid input or malloc failure; Other failures
1399 * will be handled by the caller using the input pathame.
1400 */
1401 char *canonicalize_path(const char *path)
1402 {
1403 char *canonical, *p;
1404
1405 if (!path || !*path)
1406 return NULL;
1407
1408 canonical = realpath(path, NULL);
1409 if (!canonical)
1410 return strdup(path);
1411 p = strrchr(canonical, '/');
1412 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1413 char *dm = canonicalize_dm_name(p + 1);
1414
1415 if (dm) {
1416 free(canonical);
1417 return dm;
1418 }
1419 }
1420 return canonical;
1421 }
1422
1423 /*
1424 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1425 * is safe to continue.
1426 */
1427 int check_mounted(const char* file)
1428 {
1429 int fd;
1430 int ret;
1431
1432 fd = open(file, O_RDONLY);
1433 if (fd < 0) {
1434 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1435 return -errno;
1436 }
1437
1438 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1439 close(fd);
1440
1441 return ret;
1442 }
1443
1444 int check_mounted_where(int fd, const char *file, char *where, int size,
1445 struct btrfs_fs_devices **fs_dev_ret)
1446 {
1447 int ret;
1448 u64 total_devs = 1;
1449 int is_btrfs;
1450 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1451 FILE *f;
1452 struct mntent *mnt;
1453
1454 /* scan the initial device */
1455 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1456 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1457 is_btrfs = (ret >= 0);
1458
1459 /* scan other devices */
1460 if (is_btrfs && total_devs > 1) {
1461 ret = btrfs_scan_lblkid();
1462 if (ret)
1463 return ret;
1464 }
1465
1466 /* iterate over the list of currently mountes filesystems */
1467 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1468 return -errno;
1469
1470 while ((mnt = getmntent (f)) != NULL) {
1471 if(is_btrfs) {
1472 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1473 continue;
1474
1475 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1476 } else {
1477 /* ignore entries in the mount table that are not
1478 associated with a file*/
1479 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1480 goto out_mntloop_err;
1481 else if(!ret)
1482 continue;
1483
1484 ret = is_same_loop_file(file, mnt->mnt_fsname);
1485 }
1486
1487 if(ret < 0)
1488 goto out_mntloop_err;
1489 else if(ret)
1490 break;
1491 }
1492
1493 /* Did we find an entry in mnt table? */
1494 if (mnt && size && where) {
1495 strncpy(where, mnt->mnt_dir, size);
1496 where[size-1] = 0;
1497 }
1498 if (fs_dev_ret)
1499 *fs_dev_ret = fs_devices_mnt;
1500
1501 ret = (mnt != NULL);
1502
1503 out_mntloop_err:
1504 endmntent (f);
1505
1506 return ret;
1507 }
1508
1509 struct pending_dir {
1510 struct list_head list;
1511 char name[PATH_MAX];
1512 };
1513
1514 int btrfs_register_one_device(const char *fname)
1515 {
1516 struct btrfs_ioctl_vol_args args;
1517 int fd;
1518 int ret;
1519 int e;
1520
1521 fd = open("/dev/btrfs-control", O_RDWR);
1522 if (fd < 0) {
1523 fprintf(stderr, "failed to open /dev/btrfs-control "
1524 "skipping device registration: %s\n",
1525 strerror(errno));
1526 return -errno;
1527 }
1528 memset(&args, 0, sizeof(args));
1529 strncpy_null(args.name, fname);
1530 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1531 e = errno;
1532 if (ret < 0) {
1533 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1534 fname, strerror(e));
1535 ret = -e;
1536 }
1537 close(fd);
1538 return ret;
1539 }
1540
1541 /*
1542 * Register all devices in the fs_uuid list created in the user
1543 * space. Ensure btrfs_scan_lblkid() is called before this func.
1544 */
1545 int btrfs_register_all_devices(void)
1546 {
1547 int err;
1548 struct btrfs_fs_devices *fs_devices;
1549 struct btrfs_device *device;
1550 struct list_head *all_uuids;
1551
1552 all_uuids = btrfs_scanned_uuids();
1553
1554 list_for_each_entry(fs_devices, all_uuids, list) {
1555 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1556 if (*device->name) {
1557 err = btrfs_register_one_device(device->name);
1558 if (err < 0)
1559 return err;
1560 if (err > 0)
1561 return -err;
1562 }
1563 }
1564 }
1565 return 0;
1566 }
1567
1568 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1569 int super_offset)
1570 {
1571 struct btrfs_super_block *disk_super;
1572 char *buf;
1573 int ret = 0;
1574
1575 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1576 if (!buf) {
1577 ret = -ENOMEM;
1578 goto out;
1579 }
1580 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1581 if (ret != BTRFS_SUPER_INFO_SIZE)
1582 goto brelse;
1583
1584 ret = 0;
1585 disk_super = (struct btrfs_super_block *)buf;
1586 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1587 goto brelse;
1588
1589 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1590 BTRFS_FSID_SIZE))
1591 ret = 1;
1592 brelse:
1593 free(buf);
1594 out:
1595 return ret;
1596 }
1597
1598 /*
1599 * Note: this function uses a static per-thread buffer. Do not call this
1600 * function more than 10 times within one argument list!
1601 */
1602 const char *pretty_size_mode(u64 size, unsigned mode)
1603 {
1604 static __thread int ps_index = 0;
1605 static __thread char ps_array[10][32];
1606 char *ret;
1607
1608 ret = ps_array[ps_index];
1609 ps_index++;
1610 ps_index %= 10;
1611 (void)pretty_size_snprintf(size, ret, 32, mode);
1612
1613 return ret;
1614 }
1615
1616 static const char* unit_suffix_binary[] =
1617 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1618 static const char* unit_suffix_decimal[] =
1619 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1620
1621 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1622 {
1623 int num_divs;
1624 float fraction;
1625 u64 base = 0;
1626 int mult = 0;
1627 const char** suffix = NULL;
1628 u64 last_size;
1629
1630 if (str_size == 0)
1631 return 0;
1632
1633 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1634 snprintf(str, str_size, "%llu", size);
1635 return 0;
1636 }
1637
1638 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1639 base = 1024;
1640 mult = 1024;
1641 suffix = unit_suffix_binary;
1642 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1643 base = 1000;
1644 mult = 1000;
1645 suffix = unit_suffix_decimal;
1646 }
1647
1648 /* Unknown mode */
1649 if (!base) {
1650 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1651 unit_mode);
1652 assert(0);
1653 return -1;
1654 }
1655
1656 num_divs = 0;
1657 last_size = size;
1658 switch (unit_mode & UNITS_MODE_MASK) {
1659 case UNITS_TBYTES: base *= mult; num_divs++;
1660 case UNITS_GBYTES: base *= mult; num_divs++;
1661 case UNITS_MBYTES: base *= mult; num_divs++;
1662 case UNITS_KBYTES: num_divs++;
1663 break;
1664 case UNITS_BYTES:
1665 base = 1;
1666 num_divs = 0;
1667 break;
1668 default:
1669 while (size >= mult) {
1670 last_size = size;
1671 size /= mult;
1672 num_divs++;
1673 }
1674 }
1675
1676 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1677 str[0] = '\0';
1678 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1679 num_divs);
1680 assert(0);
1681 return -1;
1682 }
1683 fraction = (float)last_size / base;
1684
1685 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1686 }
1687
1688 /*
1689 * __strncpy__null - strncpy with null termination
1690 * @dest: the target array
1691 * @src: the source string
1692 * @n: maximum bytes to copy (size of *dest)
1693 *
1694 * Like strncpy, but ensures destination is null-terminated.
1695 *
1696 * Copies the string pointed to by src, including the terminating null
1697 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1698 * of n bytes. Then ensure that dest is null-terminated.
1699 */
1700 char *__strncpy__null(char *dest, const char *src, size_t n)
1701 {
1702 strncpy(dest, src, n);
1703 if (n > 0)
1704 dest[n - 1] = '\0';
1705 return dest;
1706 }
1707
1708 /*
1709 * Checks to make sure that the label matches our requirements.
1710 * Returns:
1711 0 if everything is safe and usable
1712 -1 if the label is too long
1713 */
1714 static int check_label(const char *input)
1715 {
1716 int len = strlen(input);
1717
1718 if (len > BTRFS_LABEL_SIZE - 1) {
1719 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1720 input, BTRFS_LABEL_SIZE - 1);
1721 return -1;
1722 }
1723
1724 return 0;
1725 }
1726
1727 static int set_label_unmounted(const char *dev, const char *label)
1728 {
1729 struct btrfs_trans_handle *trans;
1730 struct btrfs_root *root;
1731 int ret;
1732
1733 ret = check_mounted(dev);
1734 if (ret < 0) {
1735 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1736 return -1;
1737 }
1738 if (ret > 0) {
1739 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1740 dev);
1741 return -1;
1742 }
1743
1744 /* Open the super_block at the default location
1745 * and as read-write.
1746 */
1747 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1748 if (!root) /* errors are printed by open_ctree() */
1749 return -1;
1750
1751 trans = btrfs_start_transaction(root, 1);
1752 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1753 label);
1754 btrfs_commit_transaction(trans, root);
1755
1756 /* Now we close it since we are done. */
1757 close_ctree(root);
1758 return 0;
1759 }
1760
1761 static int set_label_mounted(const char *mount_path, const char *label)
1762 {
1763 int fd;
1764
1765 fd = open(mount_path, O_RDONLY | O_NOATIME);
1766 if (fd < 0) {
1767 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1768 return -1;
1769 }
1770
1771 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1772 fprintf(stderr, "ERROR: unable to set label %s\n",
1773 strerror(errno));
1774 close(fd);
1775 return -1;
1776 }
1777
1778 close(fd);
1779 return 0;
1780 }
1781
1782 int get_label_unmounted(const char *dev, char *label)
1783 {
1784 struct btrfs_root *root;
1785 int ret;
1786
1787 ret = check_mounted(dev);
1788 if (ret < 0) {
1789 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1790 return -1;
1791 }
1792
1793 /* Open the super_block at the default location
1794 * and as read-only.
1795 */
1796 root = open_ctree(dev, 0, 0);
1797 if(!root)
1798 return -1;
1799
1800 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1801
1802 /* Now we close it since we are done. */
1803 close_ctree(root);
1804 return 0;
1805 }
1806
1807 /*
1808 * If a partition is mounted, try to get the filesystem label via its
1809 * mounted path rather than device. Return the corresponding error
1810 * the user specified the device path.
1811 */
1812 int get_label_mounted(const char *mount_path, char *labelp)
1813 {
1814 char label[BTRFS_LABEL_SIZE];
1815 int fd;
1816 int ret;
1817
1818 fd = open(mount_path, O_RDONLY | O_NOATIME);
1819 if (fd < 0) {
1820 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1821 return -1;
1822 }
1823
1824 memset(label, '\0', sizeof(label));
1825 ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
1826 if (ret < 0) {
1827 if (errno != ENOTTY)
1828 fprintf(stderr, "ERROR: unable to get label %s\n",
1829 strerror(errno));
1830 ret = -errno;
1831 close(fd);
1832 return ret;
1833 }
1834
1835 strncpy(labelp, label, sizeof(label));
1836 close(fd);
1837 return 0;
1838 }
1839
1840 int get_label(const char *btrfs_dev, char *label)
1841 {
1842 int ret;
1843
1844 ret = is_existing_blk_or_reg_file(btrfs_dev);
1845 if (!ret)
1846 ret = get_label_mounted(btrfs_dev, label);
1847 else if (ret > 0)
1848 ret = get_label_unmounted(btrfs_dev, label);
1849
1850 return ret;
1851 }
1852
1853 int set_label(const char *btrfs_dev, const char *label)
1854 {
1855 int ret;
1856
1857 if (check_label(label))
1858 return -1;
1859
1860 ret = is_existing_blk_or_reg_file(btrfs_dev);
1861 if (!ret)
1862 ret = set_label_mounted(btrfs_dev, label);
1863 else if (ret > 0)
1864 ret = set_label_unmounted(btrfs_dev, label);
1865
1866 return ret;
1867 }
1868
1869 /*
1870 * Unsafe subvolume check.
1871 *
1872 * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
1873 * btrfs mount point.
1874 * Must use together with other reliable method like btrfs ioctl.
1875 */
1876 static int __is_subvol(const char *path)
1877 {
1878 struct stat st;
1879 int ret;
1880
1881 ret = lstat(path, &st);
1882 if (ret < 0)
1883 return ret;
1884
1885 return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
1886 }
1887
1888 /*
1889 * A not-so-good version fls64. No fascinating optimization since
1890 * no one except parse_size use it
1891 */
1892 static int fls64(u64 x)
1893 {
1894 int i;
1895
1896 for (i = 0; i <64; i++)
1897 if (x << i & (1ULL << 63))
1898 return 64 - i;
1899 return 64 - i;
1900 }
1901
1902 u64 parse_size(char *s)
1903 {
1904 char c;
1905 char *endptr;
1906 u64 mult = 1;
1907 u64 ret;
1908
1909 if (!s) {
1910 fprintf(stderr, "ERROR: Size value is empty\n");
1911 exit(1);
1912 }
1913 if (s[0] == '-') {
1914 fprintf(stderr,
1915 "ERROR: Size value '%s' is less equal than 0\n", s);
1916 exit(1);
1917 }
1918 ret = strtoull(s, &endptr, 10);
1919 if (endptr == s) {
1920 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1921 exit(1);
1922 }
1923 if (endptr[0] && endptr[1]) {
1924 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1925 endptr[1]);
1926 exit(1);
1927 }
1928 /*
1929 * strtoll returns LLONG_MAX when overflow, if this happens,
1930 * need to call strtoull to get the real size
1931 */
1932 if (errno == ERANGE && ret == ULLONG_MAX) {
1933 fprintf(stderr,
1934 "ERROR: Size value '%s' is too large for u64\n", s);
1935 exit(1);
1936 }
1937 if (endptr[0]) {
1938 c = tolower(endptr[0]);
1939 switch (c) {
1940 case 'e':
1941 mult *= 1024;
1942 /* fallthrough */
1943 case 'p':
1944 mult *= 1024;
1945 /* fallthrough */
1946 case 't':
1947 mult *= 1024;
1948 /* fallthrough */
1949 case 'g':
1950 mult *= 1024;
1951 /* fallthrough */
1952 case 'm':
1953 mult *= 1024;
1954 /* fallthrough */
1955 case 'k':
1956 mult *= 1024;
1957 /* fallthrough */
1958 case 'b':
1959 break;
1960 default:
1961 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1962 c);
1963 exit(1);
1964 }
1965 }
1966 /* Check whether ret * mult overflow */
1967 if (fls64(ret) + fls64(mult) - 1 > 64) {
1968 fprintf(stderr,
1969 "ERROR: Size value '%s' is too large for u64\n", s);
1970 exit(1);
1971 }
1972 ret *= mult;
1973 return ret;
1974 }
1975
1976 u64 parse_qgroupid(const char *p)
1977 {
1978 char *s = strchr(p, '/');
1979 const char *ptr_src_end = p + strlen(p);
1980 char *ptr_parse_end = NULL;
1981 u64 level;
1982 u64 id;
1983 int fd;
1984 int ret = 0;
1985
1986 if (p[0] == '/')
1987 goto path;
1988
1989 /* Numeric format like '0/257' is the primary case */
1990 if (!s) {
1991 id = strtoull(p, &ptr_parse_end, 10);
1992 if (ptr_parse_end != ptr_src_end)
1993 goto path;
1994 return id;
1995 }
1996 level = strtoull(p, &ptr_parse_end, 10);
1997 if (ptr_parse_end != s)
1998 goto path;
1999
2000 id = strtoull(s + 1, &ptr_parse_end, 10);
2001 if (ptr_parse_end != ptr_src_end)
2002 goto path;
2003
2004 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
2005
2006 path:
2007 /* Path format like subv at 'my_subvol' is the fallback case */
2008 ret = __is_subvol(p);
2009 if (ret < 0 || !ret)
2010 goto err;
2011 fd = open(p, O_RDONLY);
2012 if (fd < 0)
2013 goto err;
2014 ret = lookup_ino_rootid(fd, &id);
2015 close(fd);
2016 if (ret < 0)
2017 goto err;
2018 return id;
2019
2020 err:
2021 fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
2022 exit(-1);
2023 }
2024
2025 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
2026 {
2027 int ret;
2028 struct stat st;
2029 int fd;
2030
2031 ret = stat(fname, &st);
2032 if (ret < 0) {
2033 return -1;
2034 }
2035 if (S_ISDIR(st.st_mode)) {
2036 *dirstream = opendir(fname);
2037 if (!*dirstream)
2038 return -1;
2039 fd = dirfd(*dirstream);
2040 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
2041 fd = open(fname, open_flags);
2042 } else {
2043 /*
2044 * we set this on purpose, in case the caller output
2045 * strerror(errno) as success
2046 */
2047 errno = EINVAL;
2048 return -1;
2049 }
2050 if (fd < 0) {
2051 fd = -1;
2052 if (*dirstream) {
2053 closedir(*dirstream);
2054 *dirstream = NULL;
2055 }
2056 }
2057 return fd;
2058 }
2059
2060 int open_file_or_dir(const char *fname, DIR **dirstream)
2061 {
2062 return open_file_or_dir3(fname, dirstream, O_RDWR);
2063 }
2064
2065 void close_file_or_dir(int fd, DIR *dirstream)
2066 {
2067 if (dirstream)
2068 closedir(dirstream);
2069 else if (fd >= 0)
2070 close(fd);
2071 }
2072
2073 int get_device_info(int fd, u64 devid,
2074 struct btrfs_ioctl_dev_info_args *di_args)
2075 {
2076 int ret;
2077
2078 di_args->devid = devid;
2079 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
2080
2081 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
2082 return ret ? -errno : 0;
2083 }
2084
2085 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
2086 int nr_items)
2087 {
2088 struct btrfs_dev_item *dev_item;
2089 char *buf = search_args->buf;
2090
2091 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
2092 + sizeof(struct btrfs_dev_item));
2093 buf += sizeof(struct btrfs_ioctl_search_header);
2094
2095 dev_item = (struct btrfs_dev_item *)buf;
2096
2097 return btrfs_stack_device_id(dev_item);
2098 }
2099
2100 static int search_chunk_tree_for_fs_info(int fd,
2101 struct btrfs_ioctl_fs_info_args *fi_args)
2102 {
2103 int ret;
2104 int max_items;
2105 u64 start_devid = 1;
2106 struct btrfs_ioctl_search_args search_args;
2107 struct btrfs_ioctl_search_key *search_key = &search_args.key;
2108
2109 fi_args->num_devices = 0;
2110
2111 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
2112 / (sizeof(struct btrfs_ioctl_search_header)
2113 + sizeof(struct btrfs_dev_item));
2114
2115 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
2116 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2117 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2118 search_key->min_type = BTRFS_DEV_ITEM_KEY;
2119 search_key->max_type = BTRFS_DEV_ITEM_KEY;
2120 search_key->min_transid = 0;
2121 search_key->max_transid = (u64)-1;
2122 search_key->nr_items = max_items;
2123 search_key->max_offset = (u64)-1;
2124
2125 again:
2126 search_key->min_offset = start_devid;
2127
2128 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
2129 if (ret < 0)
2130 return -errno;
2131
2132 fi_args->num_devices += (u64)search_key->nr_items;
2133
2134 if (search_key->nr_items == max_items) {
2135 start_devid = find_max_device_id(&search_args,
2136 search_key->nr_items) + 1;
2137 goto again;
2138 }
2139
2140 /* get the lastest max_id to stay consistent with the num_devices */
2141 if (search_key->nr_items == 0)
2142 /*
2143 * last tree_search returns an empty buf, use the devid of
2144 * the last dev_item of the previous tree_search
2145 */
2146 fi_args->max_id = start_devid - 1;
2147 else
2148 fi_args->max_id = find_max_device_id(&search_args,
2149 search_key->nr_items);
2150
2151 return 0;
2152 }
2153
2154 /*
2155 * For a given path, fill in the ioctl fs_ and info_ args.
2156 * If the path is a btrfs mountpoint, fill info for all devices.
2157 * If the path is a btrfs device, fill in only that device.
2158 *
2159 * The path provided must be either on a mounted btrfs fs,
2160 * or be a mounted btrfs device.
2161 *
2162 * Returns 0 on success, or a negative errno.
2163 */
2164 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
2165 struct btrfs_ioctl_dev_info_args **di_ret)
2166 {
2167 int fd = -1;
2168 int ret = 0;
2169 int ndevs = 0;
2170 int i = 0;
2171 int replacing = 0;
2172 struct btrfs_fs_devices *fs_devices_mnt = NULL;
2173 struct btrfs_ioctl_dev_info_args *di_args;
2174 struct btrfs_ioctl_dev_info_args tmp;
2175 char mp[PATH_MAX];
2176 DIR *dirstream = NULL;
2177
2178 memset(fi_args, 0, sizeof(*fi_args));
2179
2180 if (is_block_device(path) == 1) {
2181 struct btrfs_super_block *disk_super;
2182 char buf[BTRFS_SUPER_INFO_SIZE];
2183 u64 devid;
2184
2185 /* Ensure it's mounted, then set path to the mountpoint */
2186 fd = open(path, O_RDONLY);
2187 if (fd < 0) {
2188 ret = -errno;
2189 fprintf(stderr, "Couldn't open %s: %s\n",
2190 path, strerror(errno));
2191 goto out;
2192 }
2193 ret = check_mounted_where(fd, path, mp, sizeof(mp),
2194 &fs_devices_mnt);
2195 if (!ret) {
2196 ret = -EINVAL;
2197 goto out;
2198 }
2199 if (ret < 0)
2200 goto out;
2201 path = mp;
2202 /* Only fill in this one device */
2203 fi_args->num_devices = 1;
2204
2205 disk_super = (struct btrfs_super_block *)buf;
2206 ret = btrfs_read_dev_super(fd, disk_super,
2207 BTRFS_SUPER_INFO_OFFSET, 0);
2208 if (ret < 0) {
2209 ret = -EIO;
2210 goto out;
2211 }
2212 devid = btrfs_stack_device_id(&disk_super->dev_item);
2213
2214 fi_args->max_id = devid;
2215 i = devid;
2216
2217 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
2218 close(fd);
2219 }
2220
2221 /* at this point path must not be for a block device */
2222 fd = open_file_or_dir(path, &dirstream);
2223 if (fd < 0) {
2224 ret = -errno;
2225 goto out;
2226 }
2227
2228 /* fill in fi_args if not just a single device */
2229 if (fi_args->num_devices != 1) {
2230 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
2231 if (ret < 0) {
2232 ret = -errno;
2233 goto out;
2234 }
2235
2236 /*
2237 * The fs_args->num_devices does not include seed devices
2238 */
2239 ret = search_chunk_tree_for_fs_info(fd, fi_args);
2240 if (ret)
2241 goto out;
2242
2243 /*
2244 * search_chunk_tree_for_fs_info() will lacks the devid 0
2245 * so manual probe for it here.
2246 */
2247 ret = get_device_info(fd, 0, &tmp);
2248 if (!ret) {
2249 fi_args->num_devices++;
2250 ndevs++;
2251 replacing = 1;
2252 if (i == 0)
2253 i++;
2254 }
2255 }
2256
2257 if (!fi_args->num_devices)
2258 goto out;
2259
2260 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
2261 if (!di_args) {
2262 ret = -errno;
2263 goto out;
2264 }
2265
2266 if (replacing)
2267 memcpy(di_args, &tmp, sizeof(tmp));
2268 for (; i <= fi_args->max_id; ++i) {
2269 ret = get_device_info(fd, i, &di_args[ndevs]);
2270 if (ret == -ENODEV)
2271 continue;
2272 if (ret)
2273 goto out;
2274 ndevs++;
2275 }
2276
2277 /*
2278 * only when the only dev we wanted to find is not there then
2279 * let any error be returned
2280 */
2281 if (fi_args->num_devices != 1) {
2282 BUG_ON(ndevs == 0);
2283 ret = 0;
2284 }
2285
2286 out:
2287 close_file_or_dir(fd, dirstream);
2288 return ret;
2289 }
2290
2291 #define isoctal(c) (((c) & ~7) == '0')
2292
2293 static inline void translate(char *f, char *t)
2294 {
2295 while (*f != '\0') {
2296 if (*f == '\\' &&
2297 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
2298 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
2299 f += 4;
2300 } else
2301 *t++ = *f++;
2302 }
2303 *t = '\0';
2304 return;
2305 }
2306
2307 /*
2308 * Checks if the swap device.
2309 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2310 */
2311 static int is_swap_device(const char *file)
2312 {
2313 FILE *f;
2314 struct stat st_buf;
2315 dev_t dev;
2316 ino_t ino = 0;
2317 char tmp[PATH_MAX];
2318 char buf[PATH_MAX];
2319 char *cp;
2320 int ret = 0;
2321
2322 if (stat(file, &st_buf) < 0)
2323 return -errno;
2324 if (S_ISBLK(st_buf.st_mode))
2325 dev = st_buf.st_rdev;
2326 else if (S_ISREG(st_buf.st_mode)) {
2327 dev = st_buf.st_dev;
2328 ino = st_buf.st_ino;
2329 } else
2330 return 0;
2331
2332 if ((f = fopen("/proc/swaps", "r")) == NULL)
2333 return 0;
2334
2335 /* skip the first line */
2336 if (fgets(tmp, sizeof(tmp), f) == NULL)
2337 goto out;
2338
2339 while (fgets(tmp, sizeof(tmp), f) != NULL) {
2340 if ((cp = strchr(tmp, ' ')) != NULL)
2341 *cp = '\0';
2342 if ((cp = strchr(tmp, '\t')) != NULL)
2343 *cp = '\0';
2344 translate(tmp, buf);
2345 if (stat(buf, &st_buf) != 0)
2346 continue;
2347 if (S_ISBLK(st_buf.st_mode)) {
2348 if (dev == st_buf.st_rdev) {
2349 ret = 1;
2350 break;
2351 }
2352 } else if (S_ISREG(st_buf.st_mode)) {
2353 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
2354 ret = 1;
2355 break;
2356 }
2357 }
2358 }
2359
2360 out:
2361 fclose(f);
2362
2363 return ret;
2364 }
2365
2366 /*
2367 * Check for existing filesystem or partition table on device.
2368 * Returns:
2369 * 1 for existing fs or partition
2370 * 0 for nothing found
2371 * -1 for internal error
2372 */
2373 static int
2374 check_overwrite(
2375 char *device)
2376 {
2377 const char *type;
2378 blkid_probe pr = NULL;
2379 int ret;
2380 blkid_loff_t size;
2381
2382 if (!device || !*device)
2383 return 0;
2384
2385 ret = -1; /* will reset on success of all setup calls */
2386
2387 pr = blkid_new_probe_from_filename(device);
2388 if (!pr)
2389 goto out;
2390
2391 size = blkid_probe_get_size(pr);
2392 if (size < 0)
2393 goto out;
2394
2395 /* nothing to overwrite on a 0-length device */
2396 if (size == 0) {
2397 ret = 0;
2398 goto out;
2399 }
2400
2401 ret = blkid_probe_enable_partitions(pr, 1);
2402 if (ret < 0)
2403 goto out;
2404
2405 ret = blkid_do_fullprobe(pr);
2406 if (ret < 0)
2407 goto out;
2408
2409 /*
2410 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2411 * but we want the exact opposite, so reverse the return value here.
2412 *
2413 * In addition print some useful diagnostics about what actually is
2414 * on the device.
2415 */
2416 if (ret) {
2417 ret = 0;
2418 goto out;
2419 }
2420
2421 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2422 fprintf(stderr,
2423 "%s appears to contain an existing "
2424 "filesystem (%s).\n", device, type);
2425 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2426 fprintf(stderr,
2427 "%s appears to contain a partition "
2428 "table (%s).\n", device, type);
2429 } else {
2430 fprintf(stderr,
2431 "%s appears to contain something weird "
2432 "according to blkid\n", device);
2433 }
2434 ret = 1;
2435
2436 out:
2437 if (pr)
2438 blkid_free_probe(pr);
2439 if (ret == -1)
2440 fprintf(stderr,
2441 "probe of %s failed, cannot detect "
2442 "existing filesystem.\n", device);
2443 return ret;
2444 }
2445
2446 static int group_profile_devs_min(u64 flag)
2447 {
2448 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2449 case 0: /* single */
2450 case BTRFS_BLOCK_GROUP_DUP:
2451 return 1;
2452 case BTRFS_BLOCK_GROUP_RAID0:
2453 case BTRFS_BLOCK_GROUP_RAID1:
2454 case BTRFS_BLOCK_GROUP_RAID5:
2455 return 2;
2456 case BTRFS_BLOCK_GROUP_RAID6:
2457 return 3;
2458 case BTRFS_BLOCK_GROUP_RAID10:
2459 return 4;
2460 default:
2461 return -1;
2462 }
2463 }
2464
2465 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2466 u64 dev_cnt, int mixed, int ssd)
2467 {
2468 u64 allowed = 0;
2469
2470 switch (dev_cnt) {
2471 default:
2472 case 4:
2473 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2474 case 3:
2475 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2476 case 2:
2477 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2478 BTRFS_BLOCK_GROUP_RAID5;
2479 break;
2480 case 1:
2481 allowed |= BTRFS_BLOCK_GROUP_DUP;
2482 }
2483
2484 if (dev_cnt > 1 &&
2485 ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
2486 fprintf(stderr,
2487 "ERROR: DUP is not allowed when FS has multiple devices\n");
2488 return 1;
2489 }
2490 if (metadata_profile & ~allowed) {
2491 fprintf(stderr,
2492 "ERROR: unable to create FS with metadata profile %s "
2493 "(have %llu devices but %d devices are required)\n",
2494 btrfs_group_profile_str(metadata_profile), dev_cnt,
2495 group_profile_devs_min(metadata_profile));
2496 return 1;
2497 }
2498 if (data_profile & ~allowed) {
2499 fprintf(stderr,
2500 "ERROR: unable to create FS with data profile %s "
2501 "(have %llu devices but %d devices are required)\n",
2502 btrfs_group_profile_str(data_profile), dev_cnt,
2503 group_profile_devs_min(data_profile));
2504 return 1;
2505 }
2506
2507 warning_on(!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP) && ssd,
2508 "DUP may not actually lead to 2 copies on the device, see manual page");
2509
2510 return 0;
2511 }
2512
2513 int group_profile_max_safe_loss(u64 flags)
2514 {
2515 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2516 case 0: /* single */
2517 case BTRFS_BLOCK_GROUP_DUP:
2518 case BTRFS_BLOCK_GROUP_RAID0:
2519 return 0;
2520 case BTRFS_BLOCK_GROUP_RAID1:
2521 case BTRFS_BLOCK_GROUP_RAID5:
2522 case BTRFS_BLOCK_GROUP_RAID10:
2523 return 1;
2524 case BTRFS_BLOCK_GROUP_RAID6:
2525 return 2;
2526 default:
2527 return -1;
2528 }
2529 }
2530
2531 /*
2532 * Check if a device is suitable for btrfs
2533 * returns:
2534 * 1: something is wrong, an error is printed
2535 * 0: all is fine
2536 */
2537 int test_dev_for_mkfs(char *file, int force_overwrite)
2538 {
2539 int ret, fd;
2540 struct stat st;
2541
2542 ret = is_swap_device(file);
2543 if (ret < 0) {
2544 fprintf(stderr, "ERROR: checking status of %s: %s\n", file,
2545 strerror(-ret));
2546 return 1;
2547 }
2548 if (ret == 1) {
2549 fprintf(stderr, "ERROR: %s is a swap device\n", file);
2550 return 1;
2551 }
2552 if (!force_overwrite) {
2553 if (check_overwrite(file)) {
2554 fprintf(stderr, "Use the -f option to force overwrite.\n");
2555 return 1;
2556 }
2557 }
2558 ret = check_mounted(file);
2559 if (ret < 0) {
2560 fprintf(stderr, "ERROR: checking mount status of %s: %s\n",
2561 file, strerror(-ret));
2562 return 1;
2563 }
2564 if (ret == 1) {
2565 fprintf(stderr, "ERROR: %s is mounted\n", file);
2566 return 1;
2567 }
2568 /* check if the device is busy */
2569 fd = open(file, O_RDWR|O_EXCL);
2570 if (fd < 0) {
2571 fprintf(stderr, "ERROR: unable to open %s: %s\n", file,
2572 strerror(errno));
2573 return 1;
2574 }
2575 if (fstat(fd, &st)) {
2576 fprintf(stderr, "ERROR: unable to stat %s: %s\n", file,
2577 strerror(errno));
2578 close(fd);
2579 return 1;
2580 }
2581 if (!S_ISBLK(st.st_mode)) {
2582 fprintf(stderr, "ERROR: %s is not a block device\n", file);
2583 close(fd);
2584 return 1;
2585 }
2586 close(fd);
2587 return 0;
2588 }
2589
2590 int btrfs_scan_lblkid(void)
2591 {
2592 int fd = -1;
2593 int ret;
2594 u64 num_devices;
2595 struct btrfs_fs_devices *tmp_devices;
2596 blkid_dev_iterate iter = NULL;
2597 blkid_dev dev = NULL;
2598 blkid_cache cache = NULL;
2599 char path[PATH_MAX];
2600
2601 if (btrfs_scan_done)
2602 return 0;
2603
2604 if (blkid_get_cache(&cache, 0) < 0) {
2605 printf("ERROR: lblkid cache get failed\n");
2606 return 1;
2607 }
2608 blkid_probe_all(cache);
2609 iter = blkid_dev_iterate_begin(cache);
2610 blkid_dev_set_search(iter, "TYPE", "btrfs");
2611 while (blkid_dev_next(iter, &dev) == 0) {
2612 dev = blkid_verify(cache, dev);
2613 if (!dev)
2614 continue;
2615 /* if we are here its definitely a btrfs disk*/
2616 strncpy_null(path, blkid_dev_devname(dev));
2617
2618 fd = open(path, O_RDONLY);
2619 if (fd < 0) {
2620 printf("ERROR: could not open %s\n", path);
2621 continue;
2622 }
2623 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2624 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2625 if (ret) {
2626 printf("ERROR: could not scan %s\n", path);
2627 close (fd);
2628 continue;
2629 }
2630
2631 close(fd);
2632 }
2633 blkid_dev_iterate_end(iter);
2634 blkid_put_cache(cache);
2635
2636 btrfs_scan_done = 1;
2637
2638 return 0;
2639 }
2640
2641 int is_vol_small(char *file)
2642 {
2643 int fd = -1;
2644 int e;
2645 struct stat st;
2646 u64 size;
2647
2648 fd = open(file, O_RDONLY);
2649 if (fd < 0)
2650 return -errno;
2651 if (fstat(fd, &st) < 0) {
2652 e = -errno;
2653 close(fd);
2654 return e;
2655 }
2656 size = btrfs_device_size(fd, &st);
2657 if (size == 0) {
2658 close(fd);
2659 return -1;
2660 }
2661 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2662 close(fd);
2663 return 1;
2664 } else {
2665 close(fd);
2666 return 0;
2667 }
2668 }
2669
2670 /*
2671 * This reads a line from the stdin and only returns non-zero if the
2672 * first whitespace delimited token is a case insensitive match with yes
2673 * or y.
2674 */
2675 int ask_user(char *question)
2676 {
2677 char buf[30] = {0,};
2678 char *saveptr = NULL;
2679 char *answer;
2680
2681 printf("%s [y/N]: ", question);
2682
2683 return fgets(buf, sizeof(buf) - 1, stdin) &&
2684 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2685 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2686 }
2687
2688 /*
2689 * For a given:
2690 * - file or directory return the containing tree root id
2691 * - subvolume return its own tree id
2692 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2693 * undefined and function returns -1
2694 */
2695 int lookup_ino_rootid(int fd, u64 *rootid)
2696 {
2697 struct btrfs_ioctl_ino_lookup_args args;
2698 int ret;
2699 int e;
2700
2701 memset(&args, 0, sizeof(args));
2702 args.treeid = 0;
2703 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2704
2705 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2706 e = errno;
2707 if (ret) {
2708 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2709 strerror(e));
2710 return ret;
2711 }
2712
2713 *rootid = args.treeid;
2714
2715 return 0;
2716 }
2717
2718 /*
2719 * return 0 if a btrfs mount point is found
2720 * return 1 if a mount point is found but not btrfs
2721 * return <0 if something goes wrong
2722 */
2723 int find_mount_root(const char *path, char **mount_root)
2724 {
2725 FILE *mnttab;
2726 int fd;
2727 struct mntent *ent;
2728 int len;
2729 int ret;
2730 int not_btrfs = 1;
2731 int longest_matchlen = 0;
2732 char *longest_match = NULL;
2733
2734 fd = open(path, O_RDONLY | O_NOATIME);
2735 if (fd < 0)
2736 return -errno;
2737 close(fd);
2738
2739 mnttab = setmntent("/proc/self/mounts", "r");
2740 if (!mnttab)
2741 return -errno;
2742
2743 while ((ent = getmntent(mnttab))) {
2744 len = strlen(ent->mnt_dir);
2745 if (strncmp(ent->mnt_dir, path, len) == 0) {
2746 /* match found and use the latest match */
2747 if (longest_matchlen <= len) {
2748 free(longest_match);
2749 longest_matchlen = len;
2750 longest_match = strdup(ent->mnt_dir);
2751 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2752 }
2753 }
2754 }
2755 endmntent(mnttab);
2756
2757 if (!longest_match)
2758 return -ENOENT;
2759 if (not_btrfs) {
2760 free(longest_match);
2761 return 1;
2762 }
2763
2764 ret = 0;
2765 *mount_root = realpath(longest_match, NULL);
2766 if (!*mount_root)
2767 ret = -errno;
2768
2769 free(longest_match);
2770 return ret;
2771 }
2772
2773 int test_minimum_size(const char *file, u32 nodesize)
2774 {
2775 int fd;
2776 struct stat statbuf;
2777
2778 fd = open(file, O_RDONLY);
2779 if (fd < 0)
2780 return -errno;
2781 if (stat(file, &statbuf) < 0) {
2782 close(fd);
2783 return -errno;
2784 }
2785 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
2786 close(fd);
2787 return 1;
2788 }
2789 close(fd);
2790 return 0;
2791 }
2792
2793 /*
2794 * test if name is a correct subvolume name
2795 * this function return
2796 * 0-> name is not a correct subvolume name
2797 * 1-> name is a correct subvolume name
2798 */
2799 int test_issubvolname(const char *name)
2800 {
2801 return name[0] != '\0' && !strchr(name, '/') &&
2802 strcmp(name, ".") && strcmp(name, "..");
2803 }
2804
2805 /*
2806 * test if path is a directory
2807 * this function return
2808 * 0-> path exists but it is not a directory
2809 * 1-> path exists and it is a directory
2810 * -1 -> path is unaccessible
2811 */
2812 int test_isdir(const char *path)
2813 {
2814 struct stat st;
2815 int ret;
2816
2817 ret = stat(path, &st);
2818 if(ret < 0 )
2819 return -1;
2820
2821 return S_ISDIR(st.st_mode);
2822 }
2823
2824 void units_set_mode(unsigned *units, unsigned mode)
2825 {
2826 unsigned base = *units & UNITS_MODE_MASK;
2827
2828 *units = base | mode;
2829 }
2830
2831 void units_set_base(unsigned *units, unsigned base)
2832 {
2833 unsigned mode = *units & ~UNITS_MODE_MASK;
2834
2835 *units = base | mode;
2836 }
2837
2838 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2839 {
2840 int level;
2841
2842 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2843 if (!path->nodes[level])
2844 break;
2845 if (path->slots[level] + 1 >=
2846 btrfs_header_nritems(path->nodes[level]))
2847 continue;
2848 if (level == 0)
2849 btrfs_item_key_to_cpu(path->nodes[level], key,
2850 path->slots[level] + 1);
2851 else
2852 btrfs_node_key_to_cpu(path->nodes[level], key,
2853 path->slots[level] + 1);
2854 return 0;
2855 }
2856 return 1;
2857 }
2858
2859 char* btrfs_group_type_str(u64 flag)
2860 {
2861 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2862 BTRFS_SPACE_INFO_GLOBAL_RSV;
2863
2864 switch (flag & mask) {
2865 case BTRFS_BLOCK_GROUP_DATA:
2866 return "Data";
2867 case BTRFS_BLOCK_GROUP_SYSTEM:
2868 return "System";
2869 case BTRFS_BLOCK_GROUP_METADATA:
2870 return "Metadata";
2871 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2872 return "Data+Metadata";
2873 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2874 return "GlobalReserve";
2875 default:
2876 return "unknown";
2877 }
2878 }
2879
2880 char* btrfs_group_profile_str(u64 flag)
2881 {
2882 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2883 case 0:
2884 return "single";
2885 case BTRFS_BLOCK_GROUP_RAID0:
2886 return "RAID0";
2887 case BTRFS_BLOCK_GROUP_RAID1:
2888 return "RAID1";
2889 case BTRFS_BLOCK_GROUP_RAID5:
2890 return "RAID5";
2891 case BTRFS_BLOCK_GROUP_RAID6:
2892 return "RAID6";
2893 case BTRFS_BLOCK_GROUP_DUP:
2894 return "DUP";
2895 case BTRFS_BLOCK_GROUP_RAID10:
2896 return "RAID10";
2897 default:
2898 return "unknown";
2899 }
2900 }
2901
2902 u64 disk_size(char *path)
2903 {
2904 struct statfs sfs;
2905
2906 if (statfs(path, &sfs) < 0)
2907 return 0;
2908 else
2909 return sfs.f_bsize * sfs.f_blocks;
2910 }
2911
2912 u64 get_partition_size(char *dev)
2913 {
2914 u64 result;
2915 int fd = open(dev, O_RDONLY);
2916
2917 if (fd < 0)
2918 return 0;
2919 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2920 close(fd);
2921 return 0;
2922 }
2923 close(fd);
2924
2925 return result;
2926 }
2927
2928 int btrfs_tree_search2_ioctl_supported(int fd)
2929 {
2930 struct btrfs_ioctl_search_args_v2 *args2;
2931 struct btrfs_ioctl_search_key *sk;
2932 int args2_size = 1024;
2933 char args2_buf[args2_size];
2934 int ret;
2935 static int v2_supported = -1;
2936
2937 if (v2_supported != -1)
2938 return v2_supported;
2939
2940 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2941 sk = &(args2->key);
2942
2943 /*
2944 * Search for the extent tree item in the root tree.
2945 */
2946 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2947 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2948 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2949 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2950 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2951 sk->min_offset = 0;
2952 sk->max_offset = (u64)-1;
2953 sk->min_transid = 0;
2954 sk->max_transid = (u64)-1;
2955 sk->nr_items = 1;
2956 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2957 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2958 if (ret == -EOPNOTSUPP)
2959 v2_supported = 0;
2960 else if (ret == 0)
2961 v2_supported = 1;
2962 else
2963 return ret;
2964
2965 return v2_supported;
2966 }
2967
2968 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
2969 {
2970 if (nodesize < sectorsize) {
2971 fprintf(stderr,
2972 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2973 nodesize, sectorsize);
2974 return -1;
2975 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2976 fprintf(stderr,
2977 "ERROR: Illegal nodesize %u (larger than %u)\n",
2978 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2979 return -1;
2980 } else if (nodesize & (sectorsize - 1)) {
2981 fprintf(stderr,
2982 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2983 nodesize, sectorsize);
2984 return -1;
2985 } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
2986 nodesize != sectorsize) {
2987 fprintf(stderr,
2988 "ERROR: Illegal nodesize %u (not equal to %u for mixed block group)\n",
2989 nodesize, sectorsize);
2990 return -1;
2991 }
2992 return 0;
2993 }
2994
2995 /*
2996 * Copy a path argument from SRC to DEST and check the SRC length if it's at
2997 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
2998 * the buffer.
2999 * The destination buffer is zero terminated.
3000 * Return < 0 for error, 0 otherwise.
3001 */
3002 int arg_copy_path(char *dest, const char *src, int destlen)
3003 {
3004 size_t len = strlen(src);
3005
3006 if (len >= PATH_MAX || len >= destlen)
3007 return -ENAMETOOLONG;
3008
3009 __strncpy__null(dest, src, destlen);
3010
3011 return 0;
3012 }
3013
3014 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
3015 {
3016 unsigned int unit_mode = UNITS_DEFAULT;
3017 int arg_i;
3018 int arg_end;
3019
3020 for (arg_i = 0; arg_i < *argc; arg_i++) {
3021 if (!strcmp(argv[arg_i], "--raw")) {
3022 unit_mode = UNITS_RAW;
3023 argv[arg_i] = NULL;
3024 continue;
3025 }
3026 if (!strcmp(argv[arg_i], "--human-readable")) {
3027 unit_mode = UNITS_HUMAN_BINARY;
3028 argv[arg_i] = NULL;
3029 continue;
3030 }
3031
3032 if (!strcmp(argv[arg_i], "--iec")) {
3033 units_set_mode(&unit_mode, UNITS_BINARY);
3034 argv[arg_i] = NULL;
3035 continue;
3036 }
3037 if (!strcmp(argv[arg_i], "--si")) {
3038 units_set_mode(&unit_mode, UNITS_DECIMAL);
3039 argv[arg_i] = NULL;
3040 continue;
3041 }
3042
3043 if (!strcmp(argv[arg_i], "--kbytes")) {
3044 units_set_base(&unit_mode, UNITS_KBYTES);
3045 argv[arg_i] = NULL;
3046 continue;
3047 }
3048 if (!strcmp(argv[arg_i], "--mbytes")) {
3049 units_set_base(&unit_mode, UNITS_MBYTES);
3050 argv[arg_i] = NULL;
3051 continue;
3052 }
3053 if (!strcmp(argv[arg_i], "--gbytes")) {
3054 units_set_base(&unit_mode, UNITS_GBYTES);
3055 argv[arg_i] = NULL;
3056 continue;
3057 }
3058 if (!strcmp(argv[arg_i], "--tbytes")) {
3059 units_set_base(&unit_mode, UNITS_TBYTES);
3060 argv[arg_i] = NULL;
3061 continue;
3062 }
3063
3064 if (!df_mode)
3065 continue;
3066
3067 if (!strcmp(argv[arg_i], "-b")) {
3068 unit_mode = UNITS_RAW;
3069 argv[arg_i] = NULL;
3070 continue;
3071 }
3072 if (!strcmp(argv[arg_i], "-h")) {
3073 unit_mode = UNITS_HUMAN_BINARY;
3074 argv[arg_i] = NULL;
3075 continue;
3076 }
3077 if (!strcmp(argv[arg_i], "-H")) {
3078 unit_mode = UNITS_HUMAN_DECIMAL;
3079 argv[arg_i] = NULL;
3080 continue;
3081 }
3082 if (!strcmp(argv[arg_i], "-k")) {
3083 units_set_base(&unit_mode, UNITS_KBYTES);
3084 argv[arg_i] = NULL;
3085 continue;
3086 }
3087 if (!strcmp(argv[arg_i], "-m")) {
3088 units_set_base(&unit_mode, UNITS_MBYTES);
3089 argv[arg_i] = NULL;
3090 continue;
3091 }
3092 if (!strcmp(argv[arg_i], "-g")) {
3093 units_set_base(&unit_mode, UNITS_GBYTES);
3094 argv[arg_i] = NULL;
3095 continue;
3096 }
3097 if (!strcmp(argv[arg_i], "-t")) {
3098 units_set_base(&unit_mode, UNITS_TBYTES);
3099 argv[arg_i] = NULL;
3100 continue;
3101 }
3102 }
3103
3104 for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
3105 if (!argv[arg_i])
3106 continue;
3107 argv[arg_end] = argv[arg_i];
3108 arg_end++;
3109 }
3110
3111 *argc = arg_end;
3112
3113 return unit_mode;
3114 }
3115
3116 int string_is_numerical(const char *str)
3117 {
3118 if (!(*str >= '0' && *str <= '9'))
3119 return 0;
3120 while (*str >= '0' && *str <= '9')
3121 str++;
3122 if (*str != '\0')
3123 return 0;
3124 return 1;
3125 }
(deprecated) Btrfs progs developments and patch integration