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btrfs-progs: add function to stringify filesystem features
[btrfs-progs-unstable/devel.git] / utils.c
blob4554f0d15fe83e8afff03ac2a3dac0c6a235ab04
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
39 #include "kerncompat.h"
40 #include "radix-tree.h"
41 #include "ctree.h"
42 #include "disk-io.h"
43 #include "transaction.h"
44 #include "crc32c.h"
45 #include "utils.h"
46 #include "volumes.h"
47 #include "ioctl.h"
48
49 #ifndef BLKDISCARD
50 #define BLKDISCARD _IO(0x12,119)
51 #endif
52
53 static int btrfs_scan_done = 0;
54
55 static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
56
57 void fixup_argv0(char **argv, const char *token)
58 {
59 int len = strlen(argv0_buf);
60
61 snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
62 argv[0] = argv0_buf;
63 }
64
65 void set_argv0(char **argv)
66 {
67 strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
68 argv0_buf[sizeof(argv0_buf) - 1] = 0;
69 }
70
71 int check_argc_exact(int nargs, int expected)
72 {
73 if (nargs < expected)
74 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
75 if (nargs > expected)
76 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
77
78 return nargs != expected;
79 }
80
81 int check_argc_min(int nargs, int expected)
82 {
83 if (nargs < expected) {
84 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
85 return 1;
86 }
87
88 return 0;
89 }
90
91 int check_argc_max(int nargs, int expected)
92 {
93 if (nargs > expected) {
94 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
95 return 1;
96 }
97
98 return 0;
99 }
100
101
102 /*
103 * Discard the given range in one go
104 */
105 static int discard_range(int fd, u64 start, u64 len)
106 {
107 u64 range[2] = { start, len };
108
109 if (ioctl(fd, BLKDISCARD, &range) < 0)
110 return errno;
111 return 0;
112 }
113
114 /*
115 * Discard blocks in the given range in 1G chunks, the process is interruptible
116 */
117 static int discard_blocks(int fd, u64 start, u64 len)
118 {
119 while (len > 0) {
120 /* 1G granularity */
121 u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
122 int ret;
123
124 ret = discard_range(fd, start, chunk_size);
125 if (ret)
126 return ret;
127 len -= chunk_size;
128 start += chunk_size;
129 }
130
131 return 0;
132 }
133
134 static u64 reference_root_table[] = {
135 [1] = BTRFS_ROOT_TREE_OBJECTID,
136 [2] = BTRFS_EXTENT_TREE_OBJECTID,
137 [3] = BTRFS_CHUNK_TREE_OBJECTID,
138 [4] = BTRFS_DEV_TREE_OBJECTID,
139 [5] = BTRFS_FS_TREE_OBJECTID,
140 [6] = BTRFS_CSUM_TREE_OBJECTID,
141 };
142
143 int test_uuid_unique(char *fs_uuid)
144 {
145 int unique = 1;
146 blkid_dev_iterate iter = NULL;
147 blkid_dev dev = NULL;
148 blkid_cache cache = NULL;
149
150 if (blkid_get_cache(&cache, 0) < 0) {
151 printf("ERROR: lblkid cache get failed\n");
152 return 1;
153 }
154 blkid_probe_all(cache);
155 iter = blkid_dev_iterate_begin(cache);
156 blkid_dev_set_search(iter, "UUID", fs_uuid);
157
158 while (blkid_dev_next(iter, &dev) == 0) {
159 dev = blkid_verify(cache, dev);
160 if (dev) {
161 unique = 0;
162 break;
163 }
164 }
165
166 blkid_dev_iterate_end(iter);
167 blkid_put_cache(cache);
168
169 return unique;
170 }
171
172 int make_btrfs(int fd, const char *device, const char *label, char *fs_uuid,
173 u64 blocks[7], u64 num_bytes, u32 nodesize,
174 u32 sectorsize, u32 stripesize, u64 features)
175 {
176 struct btrfs_super_block super;
177 struct extent_buffer *buf = NULL;
178 struct btrfs_root_item root_item;
179 struct btrfs_disk_key disk_key;
180 struct btrfs_extent_item *extent_item;
181 struct btrfs_inode_item *inode_item;
182 struct btrfs_chunk *chunk;
183 struct btrfs_dev_item *dev_item;
184 struct btrfs_dev_extent *dev_extent;
185 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
186 u8 *ptr;
187 int i;
188 int ret;
189 u32 itemoff;
190 u32 nritems = 0;
191 u64 first_free;
192 u64 ref_root;
193 u32 array_size;
194 u32 item_size;
195 int skinny_metadata = !!(features &
196 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
197
198 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
199 first_free &= ~((u64)sectorsize - 1);
200
201 memset(&super, 0, sizeof(super));
202
203 num_bytes = (num_bytes / sectorsize) * sectorsize;
204 if (fs_uuid) {
205 if (uuid_parse(fs_uuid, super.fsid) != 0) {
206 fprintf(stderr, "could not parse UUID: %s\n", fs_uuid);
207 ret = -EINVAL;
208 goto out;
209 }
210 if (!test_uuid_unique(fs_uuid)) {
211 fprintf(stderr, "non-unique UUID: %s\n", fs_uuid);
212 ret = -EBUSY;
213 goto out;
214 }
215 } else {
216 uuid_generate(super.fsid);
217 }
218 uuid_generate(super.dev_item.uuid);
219 uuid_generate(chunk_tree_uuid);
220
221 btrfs_set_super_bytenr(&super, blocks[0]);
222 btrfs_set_super_num_devices(&super, 1);
223 btrfs_set_super_magic(&super, BTRFS_MAGIC);
224 btrfs_set_super_generation(&super, 1);
225 btrfs_set_super_root(&super, blocks[1]);
226 btrfs_set_super_chunk_root(&super, blocks[3]);
227 btrfs_set_super_total_bytes(&super, num_bytes);
228 btrfs_set_super_bytes_used(&super, 6 * nodesize);
229 btrfs_set_super_sectorsize(&super, sectorsize);
230 btrfs_set_super_leafsize(&super, nodesize);
231 btrfs_set_super_nodesize(&super, nodesize);
232 btrfs_set_super_stripesize(&super, stripesize);
233 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
234 btrfs_set_super_chunk_root_generation(&super, 1);
235 btrfs_set_super_cache_generation(&super, -1);
236 btrfs_set_super_incompat_flags(&super, features);
237 if (label)
238 strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
239
240 buf = malloc(sizeof(*buf) + max(sectorsize, nodesize));
241
242 /* create the tree of root objects */
243 memset(buf->data, 0, nodesize);
244 buf->len = nodesize;
245 btrfs_set_header_bytenr(buf, blocks[1]);
246 btrfs_set_header_nritems(buf, 4);
247 btrfs_set_header_generation(buf, 1);
248 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
249 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
250 write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
251 BTRFS_FSID_SIZE);
252
253 write_extent_buffer(buf, chunk_tree_uuid,
254 btrfs_header_chunk_tree_uuid(buf),
255 BTRFS_UUID_SIZE);
256
257 /* create the items for the root tree */
258 memset(&root_item, 0, sizeof(root_item));
259 inode_item = &root_item.inode;
260 btrfs_set_stack_inode_generation(inode_item, 1);
261 btrfs_set_stack_inode_size(inode_item, 3);
262 btrfs_set_stack_inode_nlink(inode_item, 1);
263 btrfs_set_stack_inode_nbytes(inode_item, nodesize);
264 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
265 btrfs_set_root_refs(&root_item, 1);
266 btrfs_set_root_used(&root_item, nodesize);
267 btrfs_set_root_generation(&root_item, 1);
268
269 memset(&disk_key, 0, sizeof(disk_key));
270 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
271 btrfs_set_disk_key_offset(&disk_key, 0);
272 nritems = 0;
273
274 itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) - sizeof(root_item);
275 btrfs_set_root_bytenr(&root_item, blocks[2]);
276 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
277 btrfs_set_item_key(buf, &disk_key, nritems);
278 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
279 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
280 sizeof(root_item));
281 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
282 nritems), sizeof(root_item));
283 nritems++;
284
285 itemoff = itemoff - sizeof(root_item);
286 btrfs_set_root_bytenr(&root_item, blocks[4]);
287 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
288 btrfs_set_item_key(buf, &disk_key, nritems);
289 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
290 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
291 sizeof(root_item));
292 write_extent_buffer(buf, &root_item,
293 btrfs_item_ptr_offset(buf, nritems),
294 sizeof(root_item));
295 nritems++;
296
297 itemoff = itemoff - sizeof(root_item);
298 btrfs_set_root_bytenr(&root_item, blocks[5]);
299 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
300 btrfs_set_item_key(buf, &disk_key, nritems);
301 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
302 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
303 sizeof(root_item));
304 write_extent_buffer(buf, &root_item,
305 btrfs_item_ptr_offset(buf, nritems),
306 sizeof(root_item));
307 nritems++;
308
309 itemoff = itemoff - sizeof(root_item);
310 btrfs_set_root_bytenr(&root_item, blocks[6]);
311 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
312 btrfs_set_item_key(buf, &disk_key, nritems);
313 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
314 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
315 sizeof(root_item));
316 write_extent_buffer(buf, &root_item,
317 btrfs_item_ptr_offset(buf, nritems),
318 sizeof(root_item));
319 nritems++;
320
321
322 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
323 ret = pwrite(fd, buf->data, nodesize, blocks[1]);
324 if (ret != nodesize) {
325 ret = (ret < 0 ? -errno : -EIO);
326 goto out;
327 }
328
329 /* create the items for the extent tree */
330 memset(buf->data + sizeof(struct btrfs_header), 0,
331 nodesize - sizeof(struct btrfs_header));
332 nritems = 0;
333 itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize);
334 for (i = 1; i < 7; i++) {
335 item_size = sizeof(struct btrfs_extent_item);
336 if (!skinny_metadata)
337 item_size += sizeof(struct btrfs_tree_block_info);
338
339 BUG_ON(blocks[i] < first_free);
340 BUG_ON(blocks[i] < blocks[i - 1]);
341
342 /* create extent item */
343 itemoff -= item_size;
344 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
345 if (skinny_metadata) {
346 btrfs_set_disk_key_type(&disk_key,
347 BTRFS_METADATA_ITEM_KEY);
348 btrfs_set_disk_key_offset(&disk_key, 0);
349 } else {
350 btrfs_set_disk_key_type(&disk_key,
351 BTRFS_EXTENT_ITEM_KEY);
352 btrfs_set_disk_key_offset(&disk_key, nodesize);
353 }
354 btrfs_set_item_key(buf, &disk_key, nritems);
355 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
356 itemoff);
357 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
358 item_size);
359 extent_item = btrfs_item_ptr(buf, nritems,
360 struct btrfs_extent_item);
361 btrfs_set_extent_refs(buf, extent_item, 1);
362 btrfs_set_extent_generation(buf, extent_item, 1);
363 btrfs_set_extent_flags(buf, extent_item,
364 BTRFS_EXTENT_FLAG_TREE_BLOCK);
365 nritems++;
366
367 /* create extent ref */
368 ref_root = reference_root_table[i];
369 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
370 btrfs_set_disk_key_offset(&disk_key, ref_root);
371 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
372 btrfs_set_item_key(buf, &disk_key, nritems);
373 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
374 itemoff);
375 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
376 nritems++;
377 }
378 btrfs_set_header_bytenr(buf, blocks[2]);
379 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
380 btrfs_set_header_nritems(buf, nritems);
381 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
382 ret = pwrite(fd, buf->data, nodesize, blocks[2]);
383 if (ret != nodesize) {
384 ret = (ret < 0 ? -errno : -EIO);
385 goto out;
386 }
387
388 /* create the chunk tree */
389 memset(buf->data + sizeof(struct btrfs_header), 0,
390 nodesize - sizeof(struct btrfs_header));
391 nritems = 0;
392 item_size = sizeof(*dev_item);
393 itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) - item_size;
394
395 /* first device 1 (there is no device 0) */
396 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
397 btrfs_set_disk_key_offset(&disk_key, 1);
398 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
399 btrfs_set_item_key(buf, &disk_key, nritems);
400 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
401 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
402
403 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
404 btrfs_set_device_id(buf, dev_item, 1);
405 btrfs_set_device_generation(buf, dev_item, 0);
406 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
407 btrfs_set_device_bytes_used(buf, dev_item,
408 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
409 btrfs_set_device_io_align(buf, dev_item, sectorsize);
410 btrfs_set_device_io_width(buf, dev_item, sectorsize);
411 btrfs_set_device_sector_size(buf, dev_item, sectorsize);
412 btrfs_set_device_type(buf, dev_item, 0);
413
414 write_extent_buffer(buf, super.dev_item.uuid,
415 (unsigned long)btrfs_device_uuid(dev_item),
416 BTRFS_UUID_SIZE);
417 write_extent_buffer(buf, super.fsid,
418 (unsigned long)btrfs_device_fsid(dev_item),
419 BTRFS_UUID_SIZE);
420 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
421 sizeof(*dev_item));
422
423 nritems++;
424 item_size = btrfs_chunk_item_size(1);
425 itemoff = itemoff - item_size;
426
427 /* then we have chunk 0 */
428 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
429 btrfs_set_disk_key_offset(&disk_key, 0);
430 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
431 btrfs_set_item_key(buf, &disk_key, nritems);
432 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
433 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
434
435 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
436 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
437 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
438 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
439 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
440 btrfs_set_chunk_io_align(buf, chunk, sectorsize);
441 btrfs_set_chunk_io_width(buf, chunk, sectorsize);
442 btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
443 btrfs_set_chunk_num_stripes(buf, chunk, 1);
444 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
445 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
446 nritems++;
447
448 write_extent_buffer(buf, super.dev_item.uuid,
449 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
450 BTRFS_UUID_SIZE);
451
452 /* copy the key for the chunk to the system array */
453 ptr = super.sys_chunk_array;
454 array_size = sizeof(disk_key);
455
456 memcpy(ptr, &disk_key, sizeof(disk_key));
457 ptr += sizeof(disk_key);
458
459 /* copy the chunk to the system array */
460 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
461 array_size += item_size;
462 ptr += item_size;
463 btrfs_set_super_sys_array_size(&super, array_size);
464
465 btrfs_set_header_bytenr(buf, blocks[3]);
466 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
467 btrfs_set_header_nritems(buf, nritems);
468 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
469 ret = pwrite(fd, buf->data, nodesize, blocks[3]);
470 if (ret != nodesize) {
471 ret = (ret < 0 ? -errno : -EIO);
472 goto out;
473 }
474
475 /* create the device tree */
476 memset(buf->data + sizeof(struct btrfs_header), 0,
477 nodesize - sizeof(struct btrfs_header));
478 nritems = 0;
479 itemoff = __BTRFS_LEAF_DATA_SIZE(nodesize) -
480 sizeof(struct btrfs_dev_extent);
481
482 btrfs_set_disk_key_objectid(&disk_key, 1);
483 btrfs_set_disk_key_offset(&disk_key, 0);
484 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
485 btrfs_set_item_key(buf, &disk_key, nritems);
486 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
487 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
488 sizeof(struct btrfs_dev_extent));
489 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
490 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
491 BTRFS_CHUNK_TREE_OBJECTID);
492 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
493 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
494 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
495
496 write_extent_buffer(buf, chunk_tree_uuid,
497 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
498 BTRFS_UUID_SIZE);
499
500 btrfs_set_dev_extent_length(buf, dev_extent,
501 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
502 nritems++;
503
504 btrfs_set_header_bytenr(buf, blocks[4]);
505 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
506 btrfs_set_header_nritems(buf, nritems);
507 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
508 ret = pwrite(fd, buf->data, nodesize, blocks[4]);
509 if (ret != nodesize) {
510 ret = (ret < 0 ? -errno : -EIO);
511 goto out;
512 }
513
514 /* create the FS root */
515 memset(buf->data + sizeof(struct btrfs_header), 0,
516 nodesize - sizeof(struct btrfs_header));
517 btrfs_set_header_bytenr(buf, blocks[5]);
518 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
519 btrfs_set_header_nritems(buf, 0);
520 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
521 ret = pwrite(fd, buf->data, nodesize, blocks[5]);
522 if (ret != nodesize) {
523 ret = (ret < 0 ? -errno : -EIO);
524 goto out;
525 }
526 /* finally create the csum root */
527 memset(buf->data + sizeof(struct btrfs_header), 0,
528 nodesize - sizeof(struct btrfs_header));
529 btrfs_set_header_bytenr(buf, blocks[6]);
530 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
531 btrfs_set_header_nritems(buf, 0);
532 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
533 ret = pwrite(fd, buf->data, nodesize, blocks[6]);
534 if (ret != nodesize) {
535 ret = (ret < 0 ? -errno : -EIO);
536 goto out;
537 }
538
539 /* and write out the super block */
540 BUG_ON(sizeof(super) > sectorsize);
541 memset(buf->data, 0, sectorsize);
542 memcpy(buf->data, &super, sizeof(super));
543 buf->len = sectorsize;
544 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
545 ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
546 if (ret != sectorsize) {
547 ret = (ret < 0 ? -errno : -EIO);
548 goto out;
549 }
550
551 ret = 0;
552
553 out:
554 free(buf);
555 return ret;
556 }
557
558 static const struct btrfs_fs_feature {
559 const char *name;
560 u64 flag;
561 const char *desc;
562 } mkfs_features[] = {
563 { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
564 "mixed data and metadata block groups" },
565 { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
566 "increased hardlink limit per file to 65536" },
567 { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
568 "raid56 extended format" },
569 { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
570 "reduced-size metadata extent refs" },
571 { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
572 "no explicit hole extents for files" },
573 /* Keep this one last */
574 { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
575 };
576
577 static int parse_one_fs_feature(const char *name, u64 *flags)
578 {
579 int i;
580 int found = 0;
581
582 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
583 if (name[0] == '^' &&
584 !strcmp(mkfs_features[i].name, name + 1)) {
585 *flags &= ~ mkfs_features[i].flag;
586 found = 1;
587 } else if (!strcmp(mkfs_features[i].name, name)) {
588 *flags |= mkfs_features[i].flag;
589 found = 1;
590 }
591 }
592
593 return !found;
594 }
595
596 void btrfs_parse_features_to_string(char *buf, u64 flags)
597 {
598 int i;
599
600 buf[0] = 0;
601
602 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
603 if (flags & mkfs_features[i].flag) {
604 if (*buf)
605 strcat(buf, ", ");
606 strcat(buf, mkfs_features[i].name);
607 }
608 }
609 }
610
611 void btrfs_process_fs_features(u64 flags)
612 {
613 int i;
614
615 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
616 if (flags & mkfs_features[i].flag) {
617 printf("Turning ON incompat feature '%s': %s\n",
618 mkfs_features[i].name,
619 mkfs_features[i].desc);
620 }
621 }
622 }
623
624 void btrfs_list_all_fs_features(u64 mask_disallowed)
625 {
626 int i;
627
628 fprintf(stderr, "Filesystem features available:\n");
629 for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
630 char *is_default = "";
631
632 if (mkfs_features[i].flag & mask_disallowed)
633 continue;
634 if (mkfs_features[i].flag & BTRFS_MKFS_DEFAULT_FEATURES)
635 is_default = ", default";
636 fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
637 mkfs_features[i].name,
638 mkfs_features[i].desc,
639 mkfs_features[i].flag,
640 is_default);
641 }
642 }
643
644 /*
645 * Return NULL if all features were parsed fine, otherwise return the name of
646 * the first unparsed.
647 */
648 char* btrfs_parse_fs_features(char *namelist, u64 *flags)
649 {
650 char *this_char;
651 char *save_ptr = NULL; /* Satisfy static checkers */
652
653 for (this_char = strtok_r(namelist, ",", &save_ptr);
654 this_char != NULL;
655 this_char = strtok_r(NULL, ",", &save_ptr)) {
656 if (parse_one_fs_feature(this_char, flags))
657 return this_char;
658 }
659
660 return NULL;
661 }
662
663 u64 btrfs_device_size(int fd, struct stat *st)
664 {
665 u64 size;
666 if (S_ISREG(st->st_mode)) {
667 return st->st_size;
668 }
669 if (!S_ISBLK(st->st_mode)) {
670 return 0;
671 }
672 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
673 return size;
674 }
675 return 0;
676 }
677
678 static int zero_blocks(int fd, off_t start, size_t len)
679 {
680 char *buf = malloc(len);
681 int ret = 0;
682 ssize_t written;
683
684 if (!buf)
685 return -ENOMEM;
686 memset(buf, 0, len);
687 written = pwrite(fd, buf, len, start);
688 if (written != len)
689 ret = -EIO;
690 free(buf);
691 return ret;
692 }
693
694 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
695
696 /* don't write outside the device by clamping the region to the device size */
697 static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
698 {
699 off_t end = max(start, start + len);
700
701 #ifdef __sparc__
702 /* and don't overwrite the disk labels on sparc */
703 start = max(start, 1024);
704 end = max(end, 1024);
705 #endif
706
707 start = min_t(u64, start, dev_size);
708 end = min_t(u64, end, dev_size);
709
710 return zero_blocks(fd, start, end - start);
711 }
712
713 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
714 struct btrfs_root *root, int fd, char *path,
715 u64 block_count, u32 io_width, u32 io_align,
716 u32 sectorsize)
717 {
718 struct btrfs_super_block *disk_super;
719 struct btrfs_super_block *super = root->fs_info->super_copy;
720 struct btrfs_device *device;
721 struct btrfs_dev_item *dev_item;
722 char *buf;
723 u64 total_bytes;
724 u64 num_devs;
725 int ret;
726
727 device = kzalloc(sizeof(*device), GFP_NOFS);
728 if (!device)
729 return -ENOMEM;
730 buf = kmalloc(sectorsize, GFP_NOFS);
731 if (!buf) {
732 kfree(device);
733 return -ENOMEM;
734 }
735 BUG_ON(sizeof(*disk_super) > sectorsize);
736 memset(buf, 0, sectorsize);
737
738 disk_super = (struct btrfs_super_block *)buf;
739 dev_item = &disk_super->dev_item;
740
741 uuid_generate(device->uuid);
742 device->devid = 0;
743 device->type = 0;
744 device->io_width = io_width;
745 device->io_align = io_align;
746 device->sector_size = sectorsize;
747 device->fd = fd;
748 device->writeable = 1;
749 device->total_bytes = block_count;
750 device->bytes_used = 0;
751 device->total_ios = 0;
752 device->dev_root = root->fs_info->dev_root;
753
754 ret = btrfs_add_device(trans, root, device);
755 BUG_ON(ret);
756
757 total_bytes = btrfs_super_total_bytes(super) + block_count;
758 btrfs_set_super_total_bytes(super, total_bytes);
759
760 num_devs = btrfs_super_num_devices(super) + 1;
761 btrfs_set_super_num_devices(super, num_devs);
762
763 memcpy(disk_super, super, sizeof(*disk_super));
764
765 printf("adding device %s id %llu\n", path,
766 (unsigned long long)device->devid);
767
768 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
769 btrfs_set_stack_device_id(dev_item, device->devid);
770 btrfs_set_stack_device_type(dev_item, device->type);
771 btrfs_set_stack_device_io_align(dev_item, device->io_align);
772 btrfs_set_stack_device_io_width(dev_item, device->io_width);
773 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
774 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
775 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
776 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
777
778 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
779 BUG_ON(ret != sectorsize);
780
781 kfree(buf);
782 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
783 device->fs_devices = root->fs_info->fs_devices;
784 return 0;
785 }
786
787 static void btrfs_wipe_existing_sb(int fd)
788 {
789 const char *off = NULL;
790 size_t len = 0;
791 loff_t offset;
792 char buf[BUFSIZ];
793 int rc = 0;
794 blkid_probe pr = NULL;
795
796 pr = blkid_new_probe();
797 if (!pr)
798 return;
799
800 if (blkid_probe_set_device(pr, fd, 0, 0))
801 goto out;
802
803 rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
804 if (!rc)
805 rc = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
806
807 if (rc || len == 0 || off == NULL)
808 goto out;
809
810 offset = strtoll(off, NULL, 10);
811 if (len > sizeof(buf))
812 len = sizeof(buf);
813
814 memset(buf, 0, len);
815 rc = pwrite(fd, buf, len, offset);
816 fsync(fd);
817
818 out:
819 blkid_free_probe(pr);
820 return;
821 }
822
823 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
824 u64 max_block_count, int *mixed, int discard)
825 {
826 u64 block_count;
827 struct stat st;
828 int i, ret;
829
830 ret = fstat(fd, &st);
831 if (ret < 0) {
832 fprintf(stderr, "unable to stat %s\n", file);
833 return 1;
834 }
835
836 block_count = btrfs_device_size(fd, &st);
837 if (block_count == 0) {
838 fprintf(stderr, "unable to find %s size\n", file);
839 return 1;
840 }
841 if (max_block_count)
842 block_count = min(block_count, max_block_count);
843
844 if (block_count < BTRFS_MKFS_SMALL_VOLUME_SIZE && !(*mixed))
845 *mixed = 1;
846
847 if (discard) {
848 /*
849 * We intentionally ignore errors from the discard ioctl. It
850 * is not necessary for the mkfs functionality but just an
851 * optimization.
852 */
853 if (discard_range(fd, 0, 0) == 0) {
854 printf("Performing full device TRIM (%s) ...\n",
855 pretty_size(block_count));
856 discard_blocks(fd, 0, block_count);
857 }
858 }
859
860 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
861 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
862 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
863 BTRFS_SUPER_INFO_SIZE, block_count);
864 if (!ret && zero_end)
865 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
866 ZERO_DEV_BYTES, block_count);
867
868 if (ret < 0) {
869 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
870 file, strerror(-ret));
871 return 1;
872 }
873
874 btrfs_wipe_existing_sb(fd);
875
876 *block_count_ret = block_count;
877 return 0;
878 }
879
880 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
881 struct btrfs_root *root, u64 objectid)
882 {
883 int ret;
884 struct btrfs_inode_item inode_item;
885 time_t now = time(NULL);
886
887 memset(&inode_item, 0, sizeof(inode_item));
888 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
889 btrfs_set_stack_inode_size(&inode_item, 0);
890 btrfs_set_stack_inode_nlink(&inode_item, 1);
891 btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
892 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
893 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
894 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
895 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
896 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
897 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
898 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
899 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
900 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
901
902 if (root->fs_info->tree_root == root)
903 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
904
905 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
906 if (ret)
907 goto error;
908
909 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
910 if (ret)
911 goto error;
912
913 btrfs_set_root_dirid(&root->root_item, objectid);
914 ret = 0;
915 error:
916 return ret;
917 }
918
919 /*
920 * checks if a path is a block device node
921 * Returns negative errno on failure, otherwise
922 * returns 1 for blockdev, 0 for not-blockdev
923 */
924 int is_block_device(const char *path)
925 {
926 struct stat statbuf;
927
928 if (stat(path, &statbuf) < 0)
929 return -errno;
930
931 return S_ISBLK(statbuf.st_mode);
932 }
933
934 /*
935 * check if given path is a mount point
936 * return 1 if yes. 0 if no. -1 for error
937 */
938 int is_mount_point(const char *path)
939 {
940 FILE *f;
941 struct mntent *mnt;
942 int ret = 0;
943
944 f = setmntent("/proc/self/mounts", "r");
945 if (f == NULL)
946 return -1;
947
948 while ((mnt = getmntent(f)) != NULL) {
949 if (strcmp(mnt->mnt_dir, path))
950 continue;
951 ret = 1;
952 break;
953 }
954 endmntent(f);
955 return ret;
956 }
957
958 static int is_reg_file(const char *path)
959 {
960 struct stat statbuf;
961
962 if (stat(path, &statbuf) < 0)
963 return -errno;
964 return S_ISREG(statbuf.st_mode);
965 }
966
967 /*
968 * This function checks if the given input parameter is
969 * an uuid or a path
970 * return <0 : some error in the given input
971 * return BTRFS_ARG_UNKNOWN: unknown input
972 * return BTRFS_ARG_UUID: given input is uuid
973 * return BTRFS_ARG_MNTPOINT: given input is path
974 * return BTRFS_ARG_REG: given input is regular file
975 */
976 int check_arg_type(const char *input)
977 {
978 uuid_t uuid;
979 char path[PATH_MAX];
980
981 if (!input)
982 return -EINVAL;
983
984 if (realpath(input, path)) {
985 if (is_block_device(path) == 1)
986 return BTRFS_ARG_BLKDEV;
987
988 if (is_mount_point(path) == 1)
989 return BTRFS_ARG_MNTPOINT;
990
991 if (is_reg_file(path))
992 return BTRFS_ARG_REG;
993
994 return BTRFS_ARG_UNKNOWN;
995 }
996
997 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
998 !uuid_parse(input, uuid))
999 return BTRFS_ARG_UUID;
1000
1001 return BTRFS_ARG_UNKNOWN;
1002 }
1003
1004 /*
1005 * Find the mount point for a mounted device.
1006 * On success, returns 0 with mountpoint in *mp.
1007 * On failure, returns -errno (not mounted yields -EINVAL)
1008 * Is noisy on failures, expects to be given a mounted device.
1009 */
1010 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
1011 {
1012 int ret;
1013 int fd = -1;
1014
1015 ret = is_block_device(dev);
1016 if (ret <= 0) {
1017 if (!ret) {
1018 fprintf(stderr, "%s is not a block device\n", dev);
1019 ret = -EINVAL;
1020 } else {
1021 fprintf(stderr, "Could not check %s: %s\n",
1022 dev, strerror(-ret));
1023 }
1024 goto out;
1025 }
1026
1027 fd = open(dev, O_RDONLY);
1028 if (fd < 0) {
1029 ret = -errno;
1030 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
1031 goto out;
1032 }
1033
1034 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
1035 if (!ret) {
1036 ret = -EINVAL;
1037 } else { /* mounted, all good */
1038 ret = 0;
1039 }
1040 out:
1041 if (fd != -1)
1042 close(fd);
1043 return ret;
1044 }
1045
1046 /*
1047 * Given a pathname, return a filehandle to:
1048 * the original pathname or,
1049 * if the pathname is a mounted btrfs device, to its mountpoint.
1050 *
1051 * On error, return -1, errno should be set.
1052 */
1053 int open_path_or_dev_mnt(const char *path, DIR **dirstream)
1054 {
1055 char mp[BTRFS_PATH_NAME_MAX + 1];
1056 int fdmnt;
1057
1058 if (is_block_device(path)) {
1059 int ret;
1060
1061 ret = get_btrfs_mount(path, mp, sizeof(mp));
1062 if (ret < 0) {
1063 /* not a mounted btrfs dev */
1064 errno = EINVAL;
1065 return -1;
1066 }
1067 fdmnt = open_file_or_dir(mp, dirstream);
1068 } else {
1069 fdmnt = open_file_or_dir(path, dirstream);
1070 }
1071
1072 return fdmnt;
1073 }
1074
1075 /* checks if a device is a loop device */
1076 static int is_loop_device (const char* device) {
1077 struct stat statbuf;
1078
1079 if(stat(device, &statbuf) < 0)
1080 return -errno;
1081
1082 return (S_ISBLK(statbuf.st_mode) &&
1083 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
1084 }
1085
1086
1087 /* Takes a loop device path (e.g. /dev/loop0) and returns
1088 * the associated file (e.g. /images/my_btrfs.img) */
1089 static int resolve_loop_device(const char* loop_dev, char* loop_file,
1090 int max_len)
1091 {
1092 int ret;
1093 FILE *f;
1094 char fmt[20];
1095 char p[PATH_MAX];
1096 char real_loop_dev[PATH_MAX];
1097
1098 if (!realpath(loop_dev, real_loop_dev))
1099 return -errno;
1100 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
1101 if (!(f = fopen(p, "r")))
1102 return -errno;
1103
1104 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
1105 ret = fscanf(f, fmt, loop_file);
1106 fclose(f);
1107 if (ret == EOF)
1108 return -errno;
1109
1110 return 0;
1111 }
1112
1113 /*
1114 * Checks whether a and b are identical or device
1115 * files associated with the same block device
1116 */
1117 static int is_same_blk_file(const char* a, const char* b)
1118 {
1119 struct stat st_buf_a, st_buf_b;
1120 char real_a[PATH_MAX];
1121 char real_b[PATH_MAX];
1122
1123 if (!realpath(a, real_a))
1124 strncpy_null(real_a, a);
1125
1126 if (!realpath(b, real_b))
1127 strncpy_null(real_b, b);
1128
1129 /* Identical path? */
1130 if (strcmp(real_a, real_b) == 0)
1131 return 1;
1132
1133 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
1134 if (errno == ENOENT)
1135 return 0;
1136 return -errno;
1137 }
1138
1139 /* Same blockdevice? */
1140 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
1141 st_buf_a.st_rdev == st_buf_b.st_rdev) {
1142 return 1;
1143 }
1144
1145 /* Hardlink? */
1146 if (st_buf_a.st_dev == st_buf_b.st_dev &&
1147 st_buf_a.st_ino == st_buf_b.st_ino) {
1148 return 1;
1149 }
1150
1151 return 0;
1152 }
1153
1154 /* checks if a and b are identical or device
1155 * files associated with the same block device or
1156 * if one file is a loop device that uses the other
1157 * file.
1158 */
1159 static int is_same_loop_file(const char* a, const char* b)
1160 {
1161 char res_a[PATH_MAX];
1162 char res_b[PATH_MAX];
1163 const char* final_a = NULL;
1164 const char* final_b = NULL;
1165 int ret;
1166
1167 /* Resolve a if it is a loop device */
1168 if((ret = is_loop_device(a)) < 0) {
1169 if (ret == -ENOENT)
1170 return 0;
1171 return ret;
1172 } else if (ret) {
1173 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1174 if (ret < 0) {
1175 if (errno != EPERM)
1176 return ret;
1177 } else {
1178 final_a = res_a;
1179 }
1180 } else {
1181 final_a = a;
1182 }
1183
1184 /* Resolve b if it is a loop device */
1185 if ((ret = is_loop_device(b)) < 0) {
1186 if (ret == -ENOENT)
1187 return 0;
1188 return ret;
1189 } else if (ret) {
1190 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1191 if (ret < 0) {
1192 if (errno != EPERM)
1193 return ret;
1194 } else {
1195 final_b = res_b;
1196 }
1197 } else {
1198 final_b = b;
1199 }
1200
1201 return is_same_blk_file(final_a, final_b);
1202 }
1203
1204 /* Checks if a file exists and is a block or regular file*/
1205 static int is_existing_blk_or_reg_file(const char* filename)
1206 {
1207 struct stat st_buf;
1208
1209 if(stat(filename, &st_buf) < 0) {
1210 if(errno == ENOENT)
1211 return 0;
1212 else
1213 return -errno;
1214 }
1215
1216 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1217 }
1218
1219 /* Checks if a file is used (directly or indirectly via a loop device)
1220 * by a device in fs_devices
1221 */
1222 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1223 const char* file)
1224 {
1225 int ret;
1226 struct list_head *head;
1227 struct list_head *cur;
1228 struct btrfs_device *device;
1229
1230 head = &fs_devices->devices;
1231 list_for_each(cur, head) {
1232 device = list_entry(cur, struct btrfs_device, dev_list);
1233
1234 if((ret = is_same_loop_file(device->name, file)))
1235 return ret;
1236 }
1237
1238 return 0;
1239 }
1240
1241 /*
1242 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1243 * Returns NULL on invalid input or malloc failure; Other failures
1244 * will be handled by the caller using the input pathame.
1245 */
1246 char *canonicalize_dm_name(const char *ptname)
1247 {
1248 FILE *f;
1249 size_t sz;
1250 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1251
1252 if (!ptname || !*ptname)
1253 return NULL;
1254
1255 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1256 if (!(f = fopen(path, "r")))
1257 return NULL;
1258
1259 /* read <name>\n from sysfs */
1260 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1261 name[sz - 1] = '\0';
1262 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1263
1264 if (access(path, F_OK) == 0)
1265 res = strdup(path);
1266 }
1267 fclose(f);
1268 return res;
1269 }
1270
1271 /*
1272 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1273 * to a device mapper pathname.
1274 * Returns NULL on invalid input or malloc failure; Other failures
1275 * will be handled by the caller using the input pathame.
1276 */
1277 char *canonicalize_path(const char *path)
1278 {
1279 char *canonical, *p;
1280
1281 if (!path || !*path)
1282 return NULL;
1283
1284 canonical = realpath(path, NULL);
1285 if (!canonical)
1286 return strdup(path);
1287 p = strrchr(canonical, '/');
1288 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1289 char *dm = canonicalize_dm_name(p + 1);
1290
1291 if (dm) {
1292 free(canonical);
1293 return dm;
1294 }
1295 }
1296 return canonical;
1297 }
1298
1299 /*
1300 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1301 * is safe to continue.
1302 */
1303 int check_mounted(const char* file)
1304 {
1305 int fd;
1306 int ret;
1307
1308 fd = open(file, O_RDONLY);
1309 if (fd < 0) {
1310 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1311 return -errno;
1312 }
1313
1314 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1315 close(fd);
1316
1317 return ret;
1318 }
1319
1320 int check_mounted_where(int fd, const char *file, char *where, int size,
1321 struct btrfs_fs_devices **fs_dev_ret)
1322 {
1323 int ret;
1324 u64 total_devs = 1;
1325 int is_btrfs;
1326 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1327 FILE *f;
1328 struct mntent *mnt;
1329
1330 /* scan the initial device */
1331 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1332 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1333 is_btrfs = (ret >= 0);
1334
1335 /* scan other devices */
1336 if (is_btrfs && total_devs > 1) {
1337 ret = btrfs_scan_lblkid();
1338 if (ret)
1339 return ret;
1340 }
1341
1342 /* iterate over the list of currently mountes filesystems */
1343 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1344 return -errno;
1345
1346 while ((mnt = getmntent (f)) != NULL) {
1347 if(is_btrfs) {
1348 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1349 continue;
1350
1351 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1352 } else {
1353 /* ignore entries in the mount table that are not
1354 associated with a file*/
1355 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1356 goto out_mntloop_err;
1357 else if(!ret)
1358 continue;
1359
1360 ret = is_same_loop_file(file, mnt->mnt_fsname);
1361 }
1362
1363 if(ret < 0)
1364 goto out_mntloop_err;
1365 else if(ret)
1366 break;
1367 }
1368
1369 /* Did we find an entry in mnt table? */
1370 if (mnt && size && where) {
1371 strncpy(where, mnt->mnt_dir, size);
1372 where[size-1] = 0;
1373 }
1374 if (fs_dev_ret)
1375 *fs_dev_ret = fs_devices_mnt;
1376
1377 ret = (mnt != NULL);
1378
1379 out_mntloop_err:
1380 endmntent (f);
1381
1382 return ret;
1383 }
1384
1385 struct pending_dir {
1386 struct list_head list;
1387 char name[PATH_MAX];
1388 };
1389
1390 int btrfs_register_one_device(const char *fname)
1391 {
1392 struct btrfs_ioctl_vol_args args;
1393 int fd;
1394 int ret;
1395 int e;
1396
1397 fd = open("/dev/btrfs-control", O_RDWR);
1398 if (fd < 0) {
1399 fprintf(stderr, "failed to open /dev/btrfs-control "
1400 "skipping device registration: %s\n",
1401 strerror(errno));
1402 return -errno;
1403 }
1404 strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
1405 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
1406 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1407 e = errno;
1408 if (ret < 0) {
1409 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1410 fname, strerror(e));
1411 ret = -e;
1412 }
1413 close(fd);
1414 return ret;
1415 }
1416
1417 /*
1418 * Register all devices in the fs_uuid list created in the user
1419 * space. Ensure btrfs_scan_lblkid() is called before this func.
1420 */
1421 int btrfs_register_all_devices(void)
1422 {
1423 int err;
1424 struct btrfs_fs_devices *fs_devices;
1425 struct btrfs_device *device;
1426 struct list_head *all_uuids;
1427
1428 all_uuids = btrfs_scanned_uuids();
1429
1430 list_for_each_entry(fs_devices, all_uuids, list) {
1431 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1432 if (strlen(device->name) != 0) {
1433 err = btrfs_register_one_device(device->name);
1434 if (err < 0)
1435 return err;
1436 if (err > 0)
1437 return -err;
1438 }
1439 }
1440 }
1441 return 0;
1442 }
1443
1444 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1445 int super_offset)
1446 {
1447 struct btrfs_super_block *disk_super;
1448 char *buf;
1449 int ret = 0;
1450
1451 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1452 if (!buf) {
1453 ret = -ENOMEM;
1454 goto out;
1455 }
1456 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1457 if (ret != BTRFS_SUPER_INFO_SIZE)
1458 goto brelse;
1459
1460 ret = 0;
1461 disk_super = (struct btrfs_super_block *)buf;
1462 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1463 goto brelse;
1464
1465 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1466 BTRFS_FSID_SIZE))
1467 ret = 1;
1468 brelse:
1469 free(buf);
1470 out:
1471 return ret;
1472 }
1473
1474 static const char* unit_suffix_binary[] =
1475 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1476 static const char* unit_suffix_decimal[] =
1477 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1478
1479 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1480 {
1481 int num_divs;
1482 float fraction;
1483 u64 base = 0;
1484 int mult = 0;
1485 const char** suffix = NULL;
1486 u64 last_size;
1487
1488 if (str_size == 0)
1489 return 0;
1490
1491 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1492 snprintf(str, str_size, "%llu", size);
1493 return 0;
1494 }
1495
1496 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1497 base = 1024;
1498 mult = 1024;
1499 suffix = unit_suffix_binary;
1500 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1501 base = 1000;
1502 mult = 1000;
1503 suffix = unit_suffix_decimal;
1504 }
1505
1506 /* Unknown mode */
1507 if (!base) {
1508 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1509 unit_mode);
1510 assert(0);
1511 return -1;
1512 }
1513
1514 num_divs = 0;
1515 last_size = size;
1516 switch (unit_mode & UNITS_MODE_MASK) {
1517 case UNITS_TBYTES: base *= mult; num_divs++;
1518 case UNITS_GBYTES: base *= mult; num_divs++;
1519 case UNITS_MBYTES: base *= mult; num_divs++;
1520 case UNITS_KBYTES: num_divs++;
1521 break;
1522 case UNITS_BYTES:
1523 base = 1;
1524 num_divs = 0;
1525 break;
1526 default:
1527 while (size >= mult) {
1528 last_size = size;
1529 size /= mult;
1530 num_divs++;
1531 }
1532 }
1533
1534 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1535 str[0] = '\0';
1536 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1537 num_divs);
1538 assert(0);
1539 return -1;
1540 }
1541 fraction = (float)last_size / base;
1542
1543 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1544 }
1545
1546 /*
1547 * __strncpy__null - strncpy with null termination
1548 * @dest: the target array
1549 * @src: the source string
1550 * @n: maximum bytes to copy (size of *dest)
1551 *
1552 * Like strncpy, but ensures destination is null-terminated.
1553 *
1554 * Copies the string pointed to by src, including the terminating null
1555 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1556 * of n bytes. Then ensure that dest is null-terminated.
1557 */
1558 char *__strncpy__null(char *dest, const char *src, size_t n)
1559 {
1560 strncpy(dest, src, n);
1561 if (n > 0)
1562 dest[n - 1] = '\0';
1563 return dest;
1564 }
1565
1566 /*
1567 * Checks to make sure that the label matches our requirements.
1568 * Returns:
1569 0 if everything is safe and usable
1570 -1 if the label is too long
1571 */
1572 static int check_label(const char *input)
1573 {
1574 int len = strlen(input);
1575
1576 if (len > BTRFS_LABEL_SIZE - 1) {
1577 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1578 input, BTRFS_LABEL_SIZE - 1);
1579 return -1;
1580 }
1581
1582 return 0;
1583 }
1584
1585 static int set_label_unmounted(const char *dev, const char *label)
1586 {
1587 struct btrfs_trans_handle *trans;
1588 struct btrfs_root *root;
1589 int ret;
1590
1591 ret = check_mounted(dev);
1592 if (ret < 0) {
1593 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1594 return -1;
1595 }
1596 if (ret > 0) {
1597 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1598 dev);
1599 return -1;
1600 }
1601
1602 /* Open the super_block at the default location
1603 * and as read-write.
1604 */
1605 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1606 if (!root) /* errors are printed by open_ctree() */
1607 return -1;
1608
1609 trans = btrfs_start_transaction(root, 1);
1610 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1611 label);
1612 btrfs_commit_transaction(trans, root);
1613
1614 /* Now we close it since we are done. */
1615 close_ctree(root);
1616 return 0;
1617 }
1618
1619 static int set_label_mounted(const char *mount_path, const char *label)
1620 {
1621 int fd;
1622
1623 fd = open(mount_path, O_RDONLY | O_NOATIME);
1624 if (fd < 0) {
1625 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1626 return -1;
1627 }
1628
1629 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1630 fprintf(stderr, "ERROR: unable to set label %s\n",
1631 strerror(errno));
1632 close(fd);
1633 return -1;
1634 }
1635
1636 close(fd);
1637 return 0;
1638 }
1639
1640 static int get_label_unmounted(const char *dev, char *label)
1641 {
1642 struct btrfs_root *root;
1643 int ret;
1644
1645 ret = check_mounted(dev);
1646 if (ret < 0) {
1647 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1648 return -1;
1649 }
1650 if (ret > 0) {
1651 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1652 dev);
1653 return -1;
1654 }
1655
1656 /* Open the super_block at the default location
1657 * and as read-only.
1658 */
1659 root = open_ctree(dev, 0, 0);
1660 if(!root)
1661 return -1;
1662
1663 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1664
1665 /* Now we close it since we are done. */
1666 close_ctree(root);
1667 return 0;
1668 }
1669
1670 /*
1671 * If a partition is mounted, try to get the filesystem label via its
1672 * mounted path rather than device. Return the corresponding error
1673 * the user specified the device path.
1674 */
1675 int get_label_mounted(const char *mount_path, char *labelp)
1676 {
1677 char label[BTRFS_LABEL_SIZE];
1678 int fd;
1679
1680 fd = open(mount_path, O_RDONLY | O_NOATIME);
1681 if (fd < 0) {
1682 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1683 return -1;
1684 }
1685
1686 memset(label, '\0', sizeof(label));
1687 if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
1688 fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
1689 close(fd);
1690 return -1;
1691 }
1692
1693 strncpy(labelp, label, sizeof(label));
1694 close(fd);
1695 return 0;
1696 }
1697
1698 int get_label(const char *btrfs_dev, char *label)
1699 {
1700 int ret;
1701
1702 ret = is_existing_blk_or_reg_file(btrfs_dev);
1703 if (!ret)
1704 ret = get_label_mounted(btrfs_dev, label);
1705 else if (ret > 0)
1706 ret = get_label_unmounted(btrfs_dev, label);
1707
1708 return ret;
1709 }
1710
1711 int set_label(const char *btrfs_dev, const char *label)
1712 {
1713 int ret;
1714
1715 if (check_label(label))
1716 return -1;
1717
1718 ret = is_existing_blk_or_reg_file(btrfs_dev);
1719 if (!ret)
1720 ret = set_label_mounted(btrfs_dev, label);
1721 else if (ret > 0)
1722 ret = set_label_unmounted(btrfs_dev, label);
1723
1724 return ret;
1725 }
1726
1727 /*
1728 * Unsafe subvolume check.
1729 *
1730 * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
1731 * btrfs mount point.
1732 * Must use together with other reliable method like btrfs ioctl.
1733 */
1734 static int __is_subvol(const char *path)
1735 {
1736 struct stat st;
1737 int ret;
1738
1739 ret = lstat(path, &st);
1740 if (ret < 0)
1741 return ret;
1742
1743 return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
1744 }
1745
1746 /*
1747 * A not-so-good version fls64. No fascinating optimization since
1748 * no one except parse_size use it
1749 */
1750 static int fls64(u64 x)
1751 {
1752 int i;
1753
1754 for (i = 0; i <64; i++)
1755 if (x << i & (1ULL << 63))
1756 return 64 - i;
1757 return 64 - i;
1758 }
1759
1760 u64 parse_size(char *s)
1761 {
1762 char c;
1763 char *endptr;
1764 u64 mult = 1;
1765 u64 ret;
1766
1767 if (!s) {
1768 fprintf(stderr, "ERROR: Size value is empty\n");
1769 exit(1);
1770 }
1771 if (s[0] == '-') {
1772 fprintf(stderr,
1773 "ERROR: Size value '%s' is less equal than 0\n", s);
1774 exit(1);
1775 }
1776 ret = strtoull(s, &endptr, 10);
1777 if (endptr == s) {
1778 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1779 exit(1);
1780 }
1781 if (endptr[0] && endptr[1]) {
1782 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1783 endptr[1]);
1784 exit(1);
1785 }
1786 /*
1787 * strtoll returns LLONG_MAX when overflow, if this happens,
1788 * need to call strtoull to get the real size
1789 */
1790 if (errno == ERANGE && ret == ULLONG_MAX) {
1791 fprintf(stderr,
1792 "ERROR: Size value '%s' is too large for u64\n", s);
1793 exit(1);
1794 }
1795 if (endptr[0]) {
1796 c = tolower(endptr[0]);
1797 switch (c) {
1798 case 'e':
1799 mult *= 1024;
1800 /* fallthrough */
1801 case 'p':
1802 mult *= 1024;
1803 /* fallthrough */
1804 case 't':
1805 mult *= 1024;
1806 /* fallthrough */
1807 case 'g':
1808 mult *= 1024;
1809 /* fallthrough */
1810 case 'm':
1811 mult *= 1024;
1812 /* fallthrough */
1813 case 'k':
1814 mult *= 1024;
1815 /* fallthrough */
1816 case 'b':
1817 break;
1818 default:
1819 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1820 c);
1821 exit(1);
1822 }
1823 }
1824 /* Check whether ret * mult overflow */
1825 if (fls64(ret) + fls64(mult) - 1 > 64) {
1826 fprintf(stderr,
1827 "ERROR: Size value '%s' is too large for u64\n", s);
1828 exit(1);
1829 }
1830 ret *= mult;
1831 return ret;
1832 }
1833
1834 u64 parse_qgroupid(const char *p)
1835 {
1836 char *s = strchr(p, '/');
1837 const char *ptr_src_end = p + strlen(p);
1838 char *ptr_parse_end = NULL;
1839 u64 level;
1840 u64 id;
1841 int fd;
1842 int ret = 0;
1843
1844 if (p[0] == '/')
1845 goto path;
1846
1847 /* Numeric format like '0/257' is the primary case */
1848 if (!s) {
1849 id = strtoull(p, &ptr_parse_end, 10);
1850 if (ptr_parse_end != ptr_src_end)
1851 goto path;
1852 return id;
1853 }
1854 level = strtoull(p, &ptr_parse_end, 10);
1855 if (ptr_parse_end != s)
1856 goto path;
1857
1858 id = strtoull(s + 1, &ptr_parse_end, 10);
1859 if (ptr_parse_end != ptr_src_end)
1860 goto path;
1861
1862 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
1863
1864 path:
1865 /* Path format like subv at 'my_subvol' is the fallback case */
1866 ret = __is_subvol(p);
1867 if (ret < 0 || !ret)
1868 goto err;
1869 fd = open(p, O_RDONLY);
1870 if (fd < 0)
1871 goto err;
1872 ret = lookup_ino_rootid(fd, &id);
1873 close(fd);
1874 if (ret < 0)
1875 goto err;
1876 return id;
1877
1878 err:
1879 fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
1880 exit(-1);
1881 }
1882
1883 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
1884 {
1885 int ret;
1886 struct stat st;
1887 int fd;
1888
1889 ret = stat(fname, &st);
1890 if (ret < 0) {
1891 return -1;
1892 }
1893 if (S_ISDIR(st.st_mode)) {
1894 *dirstream = opendir(fname);
1895 if (!*dirstream)
1896 return -1;
1897 fd = dirfd(*dirstream);
1898 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
1899 fd = open(fname, open_flags);
1900 } else {
1901 /*
1902 * we set this on purpose, in case the caller output
1903 * strerror(errno) as success
1904 */
1905 errno = EINVAL;
1906 return -1;
1907 }
1908 if (fd < 0) {
1909 fd = -1;
1910 if (*dirstream)
1911 closedir(*dirstream);
1912 }
1913 return fd;
1914 }
1915
1916 int open_file_or_dir(const char *fname, DIR **dirstream)
1917 {
1918 return open_file_or_dir3(fname, dirstream, O_RDWR);
1919 }
1920
1921 void close_file_or_dir(int fd, DIR *dirstream)
1922 {
1923 if (dirstream)
1924 closedir(dirstream);
1925 else if (fd >= 0)
1926 close(fd);
1927 }
1928
1929 int get_device_info(int fd, u64 devid,
1930 struct btrfs_ioctl_dev_info_args *di_args)
1931 {
1932 int ret;
1933
1934 di_args->devid = devid;
1935 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
1936
1937 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
1938 return ret ? -errno : 0;
1939 }
1940
1941 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
1942 int nr_items)
1943 {
1944 struct btrfs_dev_item *dev_item;
1945 char *buf = search_args->buf;
1946
1947 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
1948 + sizeof(struct btrfs_dev_item));
1949 buf += sizeof(struct btrfs_ioctl_search_header);
1950
1951 dev_item = (struct btrfs_dev_item *)buf;
1952
1953 return btrfs_stack_device_id(dev_item);
1954 }
1955
1956 static int search_chunk_tree_for_fs_info(int fd,
1957 struct btrfs_ioctl_fs_info_args *fi_args)
1958 {
1959 int ret;
1960 int max_items;
1961 u64 start_devid = 1;
1962 struct btrfs_ioctl_search_args search_args;
1963 struct btrfs_ioctl_search_key *search_key = &search_args.key;
1964
1965 fi_args->num_devices = 0;
1966
1967 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
1968 / (sizeof(struct btrfs_ioctl_search_header)
1969 + sizeof(struct btrfs_dev_item));
1970
1971 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
1972 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
1973 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
1974 search_key->min_type = BTRFS_DEV_ITEM_KEY;
1975 search_key->max_type = BTRFS_DEV_ITEM_KEY;
1976 search_key->min_transid = 0;
1977 search_key->max_transid = (u64)-1;
1978 search_key->nr_items = max_items;
1979 search_key->max_offset = (u64)-1;
1980
1981 again:
1982 search_key->min_offset = start_devid;
1983
1984 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
1985 if (ret < 0)
1986 return -errno;
1987
1988 fi_args->num_devices += (u64)search_key->nr_items;
1989
1990 if (search_key->nr_items == max_items) {
1991 start_devid = find_max_device_id(&search_args,
1992 search_key->nr_items) + 1;
1993 goto again;
1994 }
1995
1996 /* get the lastest max_id to stay consistent with the num_devices */
1997 if (search_key->nr_items == 0)
1998 /*
1999 * last tree_search returns an empty buf, use the devid of
2000 * the last dev_item of the previous tree_search
2001 */
2002 fi_args->max_id = start_devid - 1;
2003 else
2004 fi_args->max_id = find_max_device_id(&search_args,
2005 search_key->nr_items);
2006
2007 return 0;
2008 }
2009
2010 /*
2011 * For a given path, fill in the ioctl fs_ and info_ args.
2012 * If the path is a btrfs mountpoint, fill info for all devices.
2013 * If the path is a btrfs device, fill in only that device.
2014 *
2015 * The path provided must be either on a mounted btrfs fs,
2016 * or be a mounted btrfs device.
2017 *
2018 * Returns 0 on success, or a negative errno.
2019 */
2020 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
2021 struct btrfs_ioctl_dev_info_args **di_ret)
2022 {
2023 int fd = -1;
2024 int ret = 0;
2025 int ndevs = 0;
2026 int i = 0;
2027 int replacing = 0;
2028 struct btrfs_fs_devices *fs_devices_mnt = NULL;
2029 struct btrfs_ioctl_dev_info_args *di_args;
2030 struct btrfs_ioctl_dev_info_args tmp;
2031 char mp[BTRFS_PATH_NAME_MAX + 1];
2032 DIR *dirstream = NULL;
2033
2034 memset(fi_args, 0, sizeof(*fi_args));
2035
2036 if (is_block_device(path)) {
2037 struct btrfs_super_block *disk_super;
2038 char buf[BTRFS_SUPER_INFO_SIZE];
2039 u64 devid;
2040
2041 /* Ensure it's mounted, then set path to the mountpoint */
2042 fd = open(path, O_RDONLY);
2043 if (fd < 0) {
2044 ret = -errno;
2045 fprintf(stderr, "Couldn't open %s: %s\n",
2046 path, strerror(errno));
2047 goto out;
2048 }
2049 ret = check_mounted_where(fd, path, mp, sizeof(mp),
2050 &fs_devices_mnt);
2051 if (!ret) {
2052 ret = -EINVAL;
2053 goto out;
2054 }
2055 if (ret < 0)
2056 goto out;
2057 path = mp;
2058 /* Only fill in this one device */
2059 fi_args->num_devices = 1;
2060
2061 disk_super = (struct btrfs_super_block *)buf;
2062 ret = btrfs_read_dev_super(fd, disk_super,
2063 BTRFS_SUPER_INFO_OFFSET, 0);
2064 if (ret < 0) {
2065 ret = -EIO;
2066 goto out;
2067 }
2068 devid = btrfs_stack_device_id(&disk_super->dev_item);
2069
2070 fi_args->max_id = devid;
2071 i = devid;
2072
2073 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
2074 close(fd);
2075 }
2076
2077 /* at this point path must not be for a block device */
2078 fd = open_file_or_dir(path, &dirstream);
2079 if (fd < 0) {
2080 ret = -errno;
2081 goto out;
2082 }
2083
2084 /* fill in fi_args if not just a single device */
2085 if (fi_args->num_devices != 1) {
2086 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
2087 if (ret < 0) {
2088 ret = -errno;
2089 goto out;
2090 }
2091
2092 /*
2093 * The fs_args->num_devices does not include seed devices
2094 */
2095 ret = search_chunk_tree_for_fs_info(fd, fi_args);
2096 if (ret)
2097 goto out;
2098
2099 /*
2100 * search_chunk_tree_for_fs_info() will lacks the devid 0
2101 * so manual probe for it here.
2102 */
2103 ret = get_device_info(fd, 0, &tmp);
2104 if (!ret) {
2105 fi_args->num_devices++;
2106 ndevs++;
2107 replacing = 1;
2108 if (i == 0)
2109 i++;
2110 }
2111 }
2112
2113 if (!fi_args->num_devices)
2114 goto out;
2115
2116 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
2117 if (!di_args) {
2118 ret = -errno;
2119 goto out;
2120 }
2121
2122 if (replacing)
2123 memcpy(di_args, &tmp, sizeof(tmp));
2124 for (; i <= fi_args->max_id; ++i) {
2125 ret = get_device_info(fd, i, &di_args[ndevs]);
2126 if (ret == -ENODEV)
2127 continue;
2128 if (ret)
2129 goto out;
2130 ndevs++;
2131 }
2132
2133 /*
2134 * only when the only dev we wanted to find is not there then
2135 * let any error be returned
2136 */
2137 if (fi_args->num_devices != 1) {
2138 BUG_ON(ndevs == 0);
2139 ret = 0;
2140 }
2141
2142 out:
2143 close_file_or_dir(fd, dirstream);
2144 return ret;
2145 }
2146
2147 #define isoctal(c) (((c) & ~7) == '0')
2148
2149 static inline void translate(char *f, char *t)
2150 {
2151 while (*f != '\0') {
2152 if (*f == '\\' &&
2153 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
2154 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
2155 f += 4;
2156 } else
2157 *t++ = *f++;
2158 }
2159 *t = '\0';
2160 return;
2161 }
2162
2163 /*
2164 * Checks if the swap device.
2165 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2166 */
2167 static int is_swap_device(const char *file)
2168 {
2169 FILE *f;
2170 struct stat st_buf;
2171 dev_t dev;
2172 ino_t ino = 0;
2173 char tmp[PATH_MAX];
2174 char buf[PATH_MAX];
2175 char *cp;
2176 int ret = 0;
2177
2178 if (stat(file, &st_buf) < 0)
2179 return -errno;
2180 if (S_ISBLK(st_buf.st_mode))
2181 dev = st_buf.st_rdev;
2182 else if (S_ISREG(st_buf.st_mode)) {
2183 dev = st_buf.st_dev;
2184 ino = st_buf.st_ino;
2185 } else
2186 return 0;
2187
2188 if ((f = fopen("/proc/swaps", "r")) == NULL)
2189 return 0;
2190
2191 /* skip the first line */
2192 if (fgets(tmp, sizeof(tmp), f) == NULL)
2193 goto out;
2194
2195 while (fgets(tmp, sizeof(tmp), f) != NULL) {
2196 if ((cp = strchr(tmp, ' ')) != NULL)
2197 *cp = '\0';
2198 if ((cp = strchr(tmp, '\t')) != NULL)
2199 *cp = '\0';
2200 translate(tmp, buf);
2201 if (stat(buf, &st_buf) != 0)
2202 continue;
2203 if (S_ISBLK(st_buf.st_mode)) {
2204 if (dev == st_buf.st_rdev) {
2205 ret = 1;
2206 break;
2207 }
2208 } else if (S_ISREG(st_buf.st_mode)) {
2209 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
2210 ret = 1;
2211 break;
2212 }
2213 }
2214 }
2215
2216 out:
2217 fclose(f);
2218
2219 return ret;
2220 }
2221
2222 /*
2223 * Check for existing filesystem or partition table on device.
2224 * Returns:
2225 * 1 for existing fs or partition
2226 * 0 for nothing found
2227 * -1 for internal error
2228 */
2229 static int
2230 check_overwrite(
2231 char *device)
2232 {
2233 const char *type;
2234 blkid_probe pr = NULL;
2235 int ret;
2236 blkid_loff_t size;
2237
2238 if (!device || !*device)
2239 return 0;
2240
2241 ret = -1; /* will reset on success of all setup calls */
2242
2243 pr = blkid_new_probe_from_filename(device);
2244 if (!pr)
2245 goto out;
2246
2247 size = blkid_probe_get_size(pr);
2248 if (size < 0)
2249 goto out;
2250
2251 /* nothing to overwrite on a 0-length device */
2252 if (size == 0) {
2253 ret = 0;
2254 goto out;
2255 }
2256
2257 ret = blkid_probe_enable_partitions(pr, 1);
2258 if (ret < 0)
2259 goto out;
2260
2261 ret = blkid_do_fullprobe(pr);
2262 if (ret < 0)
2263 goto out;
2264
2265 /*
2266 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2267 * but we want the exact opposite, so reverse the return value here.
2268 *
2269 * In addition print some useful diagnostics about what actually is
2270 * on the device.
2271 */
2272 if (ret) {
2273 ret = 0;
2274 goto out;
2275 }
2276
2277 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2278 fprintf(stderr,
2279 "%s appears to contain an existing "
2280 "filesystem (%s).\n", device, type);
2281 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2282 fprintf(stderr,
2283 "%s appears to contain a partition "
2284 "table (%s).\n", device, type);
2285 } else {
2286 fprintf(stderr,
2287 "%s appears to contain something weird "
2288 "according to blkid\n", device);
2289 }
2290 ret = 1;
2291
2292 out:
2293 if (pr)
2294 blkid_free_probe(pr);
2295 if (ret == -1)
2296 fprintf(stderr,
2297 "probe of %s failed, cannot detect "
2298 "existing filesystem.\n", device);
2299 return ret;
2300 }
2301
2302 static int group_profile_devs_min(u64 flag)
2303 {
2304 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2305 case 0: /* single */
2306 case BTRFS_BLOCK_GROUP_DUP:
2307 return 1;
2308 case BTRFS_BLOCK_GROUP_RAID0:
2309 case BTRFS_BLOCK_GROUP_RAID1:
2310 case BTRFS_BLOCK_GROUP_RAID5:
2311 return 2;
2312 case BTRFS_BLOCK_GROUP_RAID6:
2313 return 3;
2314 case BTRFS_BLOCK_GROUP_RAID10:
2315 return 4;
2316 default:
2317 return -1;
2318 }
2319 }
2320
2321 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2322 u64 dev_cnt, int mixed, char *estr)
2323 {
2324 size_t sz = 100;
2325 u64 allowed = 0;
2326
2327 switch (dev_cnt) {
2328 default:
2329 case 4:
2330 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2331 case 3:
2332 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2333 case 2:
2334 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2335 BTRFS_BLOCK_GROUP_RAID5;
2336 break;
2337 case 1:
2338 allowed |= BTRFS_BLOCK_GROUP_DUP;
2339 }
2340
2341 if (dev_cnt > 1 &&
2342 ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
2343 snprintf(estr, sz,
2344 "DUP is not allowed when FS has multiple devices\n");
2345 return 1;
2346 }
2347 if (metadata_profile & ~allowed) {
2348 snprintf(estr, sz,
2349 "unable to create FS with metadata profile %s "
2350 "(have %llu devices but %d devices are required)\n",
2351 btrfs_group_profile_str(metadata_profile), dev_cnt,
2352 group_profile_devs_min(metadata_profile));
2353 return 1;
2354 }
2355 if (data_profile & ~allowed) {
2356 snprintf(estr, sz,
2357 "unable to create FS with data profile %s "
2358 "(have %llu devices but %d devices are required)\n",
2359 btrfs_group_profile_str(data_profile), dev_cnt,
2360 group_profile_devs_min(data_profile));
2361 return 1;
2362 }
2363
2364 if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
2365 snprintf(estr, sz,
2366 "dup for data is allowed only in mixed mode");
2367 return 1;
2368 }
2369 return 0;
2370 }
2371
2372 int group_profile_max_safe_loss(u64 flags)
2373 {
2374 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2375 case 0: /* single */
2376 case BTRFS_BLOCK_GROUP_DUP:
2377 case BTRFS_BLOCK_GROUP_RAID0:
2378 return 0;
2379 case BTRFS_BLOCK_GROUP_RAID1:
2380 case BTRFS_BLOCK_GROUP_RAID5:
2381 case BTRFS_BLOCK_GROUP_RAID10:
2382 return 1;
2383 case BTRFS_BLOCK_GROUP_RAID6:
2384 return 2;
2385 default:
2386 return -1;
2387 }
2388 }
2389
2390 /* Check if disk is suitable for btrfs
2391 * returns:
2392 * 1: something is wrong, estr provides the error
2393 * 0: all is fine
2394 */
2395 int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
2396 {
2397 int ret, fd;
2398 size_t sz = 100;
2399 struct stat st;
2400
2401 ret = is_swap_device(file);
2402 if (ret < 0) {
2403 snprintf(estr, sz, "error checking %s status: %s\n", file,
2404 strerror(-ret));
2405 return 1;
2406 }
2407 if (ret == 1) {
2408 snprintf(estr, sz, "%s is a swap device\n", file);
2409 return 1;
2410 }
2411 if (!force_overwrite) {
2412 if (check_overwrite(file)) {
2413 snprintf(estr, sz, "Use the -f option to force overwrite.\n");
2414 return 1;
2415 }
2416 }
2417 ret = check_mounted(file);
2418 if (ret < 0) {
2419 snprintf(estr, sz, "error checking %s mount status\n",
2420 file);
2421 return 1;
2422 }
2423 if (ret == 1) {
2424 snprintf(estr, sz, "%s is mounted\n", file);
2425 return 1;
2426 }
2427 /* check if the device is busy */
2428 fd = open(file, O_RDWR|O_EXCL);
2429 if (fd < 0) {
2430 snprintf(estr, sz, "unable to open %s: %s\n", file,
2431 strerror(errno));
2432 return 1;
2433 }
2434 if (fstat(fd, &st)) {
2435 snprintf(estr, sz, "unable to stat %s: %s\n", file,
2436 strerror(errno));
2437 close(fd);
2438 return 1;
2439 }
2440 if (!S_ISBLK(st.st_mode)) {
2441 fprintf(stderr, "'%s' is not a block device\n", file);
2442 close(fd);
2443 return 1;
2444 }
2445 close(fd);
2446 return 0;
2447 }
2448
2449 int btrfs_scan_lblkid()
2450 {
2451 int fd = -1;
2452 int ret;
2453 u64 num_devices;
2454 struct btrfs_fs_devices *tmp_devices;
2455 blkid_dev_iterate iter = NULL;
2456 blkid_dev dev = NULL;
2457 blkid_cache cache = NULL;
2458 char path[PATH_MAX];
2459
2460 if (btrfs_scan_done)
2461 return 0;
2462
2463 if (blkid_get_cache(&cache, 0) < 0) {
2464 printf("ERROR: lblkid cache get failed\n");
2465 return 1;
2466 }
2467 blkid_probe_all(cache);
2468 iter = blkid_dev_iterate_begin(cache);
2469 blkid_dev_set_search(iter, "TYPE", "btrfs");
2470 while (blkid_dev_next(iter, &dev) == 0) {
2471 dev = blkid_verify(cache, dev);
2472 if (!dev)
2473 continue;
2474 /* if we are here its definitely a btrfs disk*/
2475 strncpy_null(path, blkid_dev_devname(dev));
2476
2477 fd = open(path, O_RDONLY);
2478 if (fd < 0) {
2479 printf("ERROR: could not open %s\n", path);
2480 continue;
2481 }
2482 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2483 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2484 if (ret) {
2485 printf("ERROR: could not scan %s\n", path);
2486 close (fd);
2487 continue;
2488 }
2489
2490 close(fd);
2491 }
2492 blkid_dev_iterate_end(iter);
2493 blkid_put_cache(cache);
2494
2495 btrfs_scan_done = 1;
2496
2497 return 0;
2498 }
2499
2500 int is_vol_small(char *file)
2501 {
2502 int fd = -1;
2503 int e;
2504 struct stat st;
2505 u64 size;
2506
2507 fd = open(file, O_RDONLY);
2508 if (fd < 0)
2509 return -errno;
2510 if (fstat(fd, &st) < 0) {
2511 e = -errno;
2512 close(fd);
2513 return e;
2514 }
2515 size = btrfs_device_size(fd, &st);
2516 if (size == 0) {
2517 close(fd);
2518 return -1;
2519 }
2520 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2521 close(fd);
2522 return 1;
2523 } else {
2524 close(fd);
2525 return 0;
2526 }
2527 }
2528
2529 /*
2530 * This reads a line from the stdin and only returns non-zero if the
2531 * first whitespace delimited token is a case insensitive match with yes
2532 * or y.
2533 */
2534 int ask_user(char *question)
2535 {
2536 char buf[30] = {0,};
2537 char *saveptr = NULL;
2538 char *answer;
2539
2540 printf("%s [y/N]: ", question);
2541
2542 return fgets(buf, sizeof(buf) - 1, stdin) &&
2543 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2544 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2545 }
2546
2547 /*
2548 * For a given:
2549 * - file or directory return the containing tree root id
2550 * - subvolume return its own tree id
2551 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2552 * undefined and function returns -1
2553 */
2554 int lookup_ino_rootid(int fd, u64 *rootid)
2555 {
2556 struct btrfs_ioctl_ino_lookup_args args;
2557 int ret;
2558 int e;
2559
2560 memset(&args, 0, sizeof(args));
2561 args.treeid = 0;
2562 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2563
2564 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2565 e = errno;
2566 if (ret) {
2567 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2568 strerror(e));
2569 return ret;
2570 }
2571
2572 *rootid = args.treeid;
2573
2574 return 0;
2575 }
2576
2577 /*
2578 * return 0 if a btrfs mount point is found
2579 * return 1 if a mount point is found but not btrfs
2580 * return <0 if something goes wrong
2581 */
2582 int find_mount_root(const char *path, char **mount_root)
2583 {
2584 FILE *mnttab;
2585 int fd;
2586 struct mntent *ent;
2587 int len;
2588 int ret;
2589 int not_btrfs = 1;
2590 int longest_matchlen = 0;
2591 char *longest_match = NULL;
2592
2593 fd = open(path, O_RDONLY | O_NOATIME);
2594 if (fd < 0)
2595 return -errno;
2596 close(fd);
2597
2598 mnttab = setmntent("/proc/self/mounts", "r");
2599 if (!mnttab)
2600 return -errno;
2601
2602 while ((ent = getmntent(mnttab))) {
2603 len = strlen(ent->mnt_dir);
2604 if (strncmp(ent->mnt_dir, path, len) == 0) {
2605 /* match found and use the latest match */
2606 if (longest_matchlen <= len) {
2607 free(longest_match);
2608 longest_matchlen = len;
2609 longest_match = strdup(ent->mnt_dir);
2610 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2611 }
2612 }
2613 }
2614 endmntent(mnttab);
2615
2616 if (!longest_match)
2617 return -ENOENT;
2618 if (not_btrfs) {
2619 free(longest_match);
2620 return 1;
2621 }
2622
2623 ret = 0;
2624 *mount_root = realpath(longest_match, NULL);
2625 if (!*mount_root)
2626 ret = -errno;
2627
2628 free(longest_match);
2629 return ret;
2630 }
2631
2632 int test_minimum_size(const char *file, u32 nodesize)
2633 {
2634 int fd;
2635 struct stat statbuf;
2636
2637 fd = open(file, O_RDONLY);
2638 if (fd < 0)
2639 return -errno;
2640 if (stat(file, &statbuf) < 0) {
2641 close(fd);
2642 return -errno;
2643 }
2644 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
2645 close(fd);
2646 return 1;
2647 }
2648 close(fd);
2649 return 0;
2650 }
2651
2652 /*
2653 * test if name is a correct subvolume name
2654 * this function return
2655 * 0-> name is not a correct subvolume name
2656 * 1-> name is a correct subvolume name
2657 */
2658 int test_issubvolname(const char *name)
2659 {
2660 return name[0] != '\0' && !strchr(name, '/') &&
2661 strcmp(name, ".") && strcmp(name, "..");
2662 }
2663
2664 /*
2665 * test if path is a directory
2666 * this function return
2667 * 0-> path exists but it is not a directory
2668 * 1-> path exists and it is a directory
2669 * -1 -> path is unaccessible
2670 */
2671 int test_isdir(const char *path)
2672 {
2673 struct stat st;
2674 int ret;
2675
2676 ret = stat(path, &st);
2677 if(ret < 0 )
2678 return -1;
2679
2680 return S_ISDIR(st.st_mode);
2681 }
2682
2683 void units_set_mode(unsigned *units, unsigned mode)
2684 {
2685 unsigned base = *units & UNITS_MODE_MASK;
2686
2687 *units = base | mode;
2688 }
2689
2690 void units_set_base(unsigned *units, unsigned base)
2691 {
2692 unsigned mode = *units & ~UNITS_MODE_MASK;
2693
2694 *units = base | mode;
2695 }
2696
2697 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2698 {
2699 int level;
2700
2701 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2702 if (!path->nodes[level])
2703 break;
2704 if (path->slots[level] + 1 >=
2705 btrfs_header_nritems(path->nodes[level]))
2706 continue;
2707 if (level == 0)
2708 btrfs_item_key_to_cpu(path->nodes[level], key,
2709 path->slots[level] + 1);
2710 else
2711 btrfs_node_key_to_cpu(path->nodes[level], key,
2712 path->slots[level] + 1);
2713 return 0;
2714 }
2715 return 1;
2716 }
2717
2718 char* btrfs_group_type_str(u64 flag)
2719 {
2720 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2721 BTRFS_SPACE_INFO_GLOBAL_RSV;
2722
2723 switch (flag & mask) {
2724 case BTRFS_BLOCK_GROUP_DATA:
2725 return "Data";
2726 case BTRFS_BLOCK_GROUP_SYSTEM:
2727 return "System";
2728 case BTRFS_BLOCK_GROUP_METADATA:
2729 return "Metadata";
2730 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2731 return "Data+Metadata";
2732 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2733 return "GlobalReserve";
2734 default:
2735 return "unknown";
2736 }
2737 }
2738
2739 char* btrfs_group_profile_str(u64 flag)
2740 {
2741 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2742 case 0:
2743 return "single";
2744 case BTRFS_BLOCK_GROUP_RAID0:
2745 return "RAID0";
2746 case BTRFS_BLOCK_GROUP_RAID1:
2747 return "RAID1";
2748 case BTRFS_BLOCK_GROUP_RAID5:
2749 return "RAID5";
2750 case BTRFS_BLOCK_GROUP_RAID6:
2751 return "RAID6";
2752 case BTRFS_BLOCK_GROUP_DUP:
2753 return "DUP";
2754 case BTRFS_BLOCK_GROUP_RAID10:
2755 return "RAID10";
2756 default:
2757 return "unknown";
2758 }
2759 }
2760
2761 u64 disk_size(char *path)
2762 {
2763 struct statfs sfs;
2764
2765 if (statfs(path, &sfs) < 0)
2766 return 0;
2767 else
2768 return sfs.f_bsize * sfs.f_blocks;
2769 }
2770
2771 u64 get_partition_size(char *dev)
2772 {
2773 u64 result;
2774 int fd = open(dev, O_RDONLY);
2775
2776 if (fd < 0)
2777 return 0;
2778 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2779 close(fd);
2780 return 0;
2781 }
2782 close(fd);
2783
2784 return result;
2785 }
2786
2787 int btrfs_tree_search2_ioctl_supported(int fd)
2788 {
2789 struct btrfs_ioctl_search_args_v2 *args2;
2790 struct btrfs_ioctl_search_key *sk;
2791 int args2_size = 1024;
2792 char args2_buf[args2_size];
2793 int ret;
2794 static int v2_supported = -1;
2795
2796 if (v2_supported != -1)
2797 return v2_supported;
2798
2799 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2800 sk = &(args2->key);
2801
2802 /*
2803 * Search for the extent tree item in the root tree.
2804 */
2805 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2806 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2807 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2808 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2809 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2810 sk->min_offset = 0;
2811 sk->max_offset = (u64)-1;
2812 sk->min_transid = 0;
2813 sk->max_transid = (u64)-1;
2814 sk->nr_items = 1;
2815 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2816 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2817 if (ret == -EOPNOTSUPP)
2818 v2_supported = 0;
2819 else if (ret == 0)
2820 v2_supported = 1;
2821 else
2822 return ret;
2823
2824 return v2_supported;
2825 }
2826
2827 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize)
2828 {
2829 if (nodesize < sectorsize) {
2830 fprintf(stderr,
2831 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2832 nodesize, sectorsize);
2833 return -1;
2834 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2835 fprintf(stderr,
2836 "ERROR: Illegal nodesize %u (larger than %u)\n",
2837 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2838 return -1;
2839 } else if (nodesize & (sectorsize - 1)) {
2840 fprintf(stderr,
2841 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2842 nodesize, sectorsize);
2843 return -1;
2844 }
2845 return 0;
2846 }
(deprecated) Btrfs progs developments and patch integration