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btrfs-progs: Fix the argument requirement for '--subvol-extents'
[btrfs-progs-unstable/devel.git] / utils.c
blob9ad1e17f20c1702984b819b5c40066c6e234d3de
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 #define _XOPEN_SOURCE 700
21 #define __USE_XOPEN2K8
22 #define __XOPEN2K8 /* due to an error in dirent.h, to get dirfd() */
23 #define _GNU_SOURCE /* O_NOATIME */
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <sys/ioctl.h>
28 #include <sys/mount.h>
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <uuid/uuid.h>
32 #include <fcntl.h>
33 #include <unistd.h>
34 #include <mntent.h>
35 #include <ctype.h>
36 #include <linux/loop.h>
37 #include <linux/major.h>
38 #include <linux/kdev_t.h>
39 #include <limits.h>
40 #include <blkid/blkid.h>
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 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 sprintf(argv0_buf, "%s", argv[0]);
68 }
69
70 int check_argc_exact(int nargs, int expected)
71 {
72 if (nargs < expected)
73 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
74 if (nargs > expected)
75 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
76
77 return nargs != expected;
78 }
79
80 int check_argc_min(int nargs, int expected)
81 {
82 if (nargs < expected) {
83 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
84 return 1;
85 }
86
87 return 0;
88 }
89
90 int check_argc_max(int nargs, int expected)
91 {
92 if (nargs > expected) {
93 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
94 return 1;
95 }
96
97 return 0;
98 }
99
100
101 /*
102 * Discard the given range in one go
103 */
104 static int discard_range(int fd, u64 start, u64 len)
105 {
106 u64 range[2] = { start, len };
107
108 if (ioctl(fd, BLKDISCARD, &range) < 0)
109 return errno;
110 return 0;
111 }
112
113 /*
114 * Discard blocks in the given range in 1G chunks, the process is interruptible
115 */
116 static int discard_blocks(int fd, u64 start, u64 len)
117 {
118 while (len > 0) {
119 /* 1G granularity */
120 u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
121 int ret;
122
123 ret = discard_range(fd, start, chunk_size);
124 if (ret)
125 return ret;
126 len -= chunk_size;
127 start += chunk_size;
128 }
129
130 return 0;
131 }
132
133 static u64 reference_root_table[] = {
134 [1] = BTRFS_ROOT_TREE_OBJECTID,
135 [2] = BTRFS_EXTENT_TREE_OBJECTID,
136 [3] = BTRFS_CHUNK_TREE_OBJECTID,
137 [4] = BTRFS_DEV_TREE_OBJECTID,
138 [5] = BTRFS_FS_TREE_OBJECTID,
139 [6] = BTRFS_CSUM_TREE_OBJECTID,
140 };
141
142 int test_uuid_unique(char *fs_uuid)
143 {
144 int unique = 1;
145 blkid_dev_iterate iter = NULL;
146 blkid_dev dev = NULL;
147 blkid_cache cache = NULL;
148
149 if (blkid_get_cache(&cache, 0) < 0) {
150 printf("ERROR: lblkid cache get failed\n");
151 return 1;
152 }
153 blkid_probe_all(cache);
154 iter = blkid_dev_iterate_begin(cache);
155 blkid_dev_set_search(iter, "UUID", fs_uuid);
156
157 while (blkid_dev_next(iter, &dev) == 0) {
158 dev = blkid_verify(cache, dev);
159 if (dev) {
160 unique = 0;
161 break;
162 }
163 }
164
165 blkid_dev_iterate_end(iter);
166 blkid_put_cache(cache);
167
168 return unique;
169 }
170
171 int make_btrfs(int fd, const char *device, const char *label, char *fs_uuid,
172 u64 blocks[7], u64 num_bytes, u32 nodesize,
173 u32 leafsize, u32 sectorsize, u32 stripesize, u64 features)
174 {
175 struct btrfs_super_block super;
176 struct extent_buffer *buf = NULL;
177 struct btrfs_root_item root_item;
178 struct btrfs_disk_key disk_key;
179 struct btrfs_extent_item *extent_item;
180 struct btrfs_inode_item *inode_item;
181 struct btrfs_chunk *chunk;
182 struct btrfs_dev_item *dev_item;
183 struct btrfs_dev_extent *dev_extent;
184 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
185 u8 *ptr;
186 int i;
187 int ret;
188 u32 itemoff;
189 u32 nritems = 0;
190 u64 first_free;
191 u64 ref_root;
192 u32 array_size;
193 u32 item_size;
194 int skinny_metadata = !!(features &
195 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
196
197 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
198 first_free &= ~((u64)sectorsize - 1);
199
200 memset(&super, 0, sizeof(super));
201
202 num_bytes = (num_bytes / sectorsize) * sectorsize;
203 if (fs_uuid) {
204 if (uuid_parse(fs_uuid, super.fsid) != 0) {
205 fprintf(stderr, "could not parse UUID: %s\n", fs_uuid);
206 ret = -EINVAL;
207 goto out;
208 }
209 if (!test_uuid_unique(fs_uuid)) {
210 fprintf(stderr, "non-unique UUID: %s\n", fs_uuid);
211 ret = -EBUSY;
212 goto out;
213 }
214 } else {
215 uuid_generate(super.fsid);
216 }
217 uuid_generate(super.dev_item.uuid);
218 uuid_generate(chunk_tree_uuid);
219
220 btrfs_set_super_bytenr(&super, blocks[0]);
221 btrfs_set_super_num_devices(&super, 1);
222 btrfs_set_super_magic(&super, BTRFS_MAGIC);
223 btrfs_set_super_generation(&super, 1);
224 btrfs_set_super_root(&super, blocks[1]);
225 btrfs_set_super_chunk_root(&super, blocks[3]);
226 btrfs_set_super_total_bytes(&super, num_bytes);
227 btrfs_set_super_bytes_used(&super, 6 * leafsize);
228 btrfs_set_super_sectorsize(&super, sectorsize);
229 btrfs_set_super_leafsize(&super, leafsize);
230 btrfs_set_super_nodesize(&super, nodesize);
231 btrfs_set_super_stripesize(&super, stripesize);
232 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
233 btrfs_set_super_chunk_root_generation(&super, 1);
234 btrfs_set_super_cache_generation(&super, -1);
235 btrfs_set_super_incompat_flags(&super, features);
236 if (label)
237 strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
238
239 buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
240
241 /* create the tree of root objects */
242 memset(buf->data, 0, leafsize);
243 buf->len = leafsize;
244 btrfs_set_header_bytenr(buf, blocks[1]);
245 btrfs_set_header_nritems(buf, 4);
246 btrfs_set_header_generation(buf, 1);
247 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
248 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
249 write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
250 BTRFS_FSID_SIZE);
251
252 write_extent_buffer(buf, chunk_tree_uuid,
253 btrfs_header_chunk_tree_uuid(buf),
254 BTRFS_UUID_SIZE);
255
256 /* create the items for the root tree */
257 memset(&root_item, 0, sizeof(root_item));
258 inode_item = &root_item.inode;
259 btrfs_set_stack_inode_generation(inode_item, 1);
260 btrfs_set_stack_inode_size(inode_item, 3);
261 btrfs_set_stack_inode_nlink(inode_item, 1);
262 btrfs_set_stack_inode_nbytes(inode_item, leafsize);
263 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
264 btrfs_set_root_refs(&root_item, 1);
265 btrfs_set_root_used(&root_item, leafsize);
266 btrfs_set_root_generation(&root_item, 1);
267
268 memset(&disk_key, 0, sizeof(disk_key));
269 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
270 btrfs_set_disk_key_offset(&disk_key, 0);
271 nritems = 0;
272
273 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
274 btrfs_set_root_bytenr(&root_item, blocks[2]);
275 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
276 btrfs_set_item_key(buf, &disk_key, nritems);
277 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
278 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
279 sizeof(root_item));
280 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
281 nritems), sizeof(root_item));
282 nritems++;
283
284 itemoff = itemoff - sizeof(root_item);
285 btrfs_set_root_bytenr(&root_item, blocks[4]);
286 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
287 btrfs_set_item_key(buf, &disk_key, nritems);
288 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
289 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
290 sizeof(root_item));
291 write_extent_buffer(buf, &root_item,
292 btrfs_item_ptr_offset(buf, nritems),
293 sizeof(root_item));
294 nritems++;
295
296 itemoff = itemoff - sizeof(root_item);
297 btrfs_set_root_bytenr(&root_item, blocks[5]);
298 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
299 btrfs_set_item_key(buf, &disk_key, nritems);
300 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
301 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
302 sizeof(root_item));
303 write_extent_buffer(buf, &root_item,
304 btrfs_item_ptr_offset(buf, nritems),
305 sizeof(root_item));
306 nritems++;
307
308 itemoff = itemoff - sizeof(root_item);
309 btrfs_set_root_bytenr(&root_item, blocks[6]);
310 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
311 btrfs_set_item_key(buf, &disk_key, nritems);
312 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
313 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
314 sizeof(root_item));
315 write_extent_buffer(buf, &root_item,
316 btrfs_item_ptr_offset(buf, nritems),
317 sizeof(root_item));
318 nritems++;
319
320
321 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
322 ret = pwrite(fd, buf->data, leafsize, blocks[1]);
323 if (ret != leafsize) {
324 ret = (ret < 0 ? -errno : -EIO);
325 goto out;
326 }
327
328 /* create the items for the extent tree */
329 memset(buf->data+sizeof(struct btrfs_header), 0,
330 leafsize-sizeof(struct btrfs_header));
331 nritems = 0;
332 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
333 for (i = 1; i < 7; i++) {
334 item_size = sizeof(struct btrfs_extent_item);
335 if (!skinny_metadata)
336 item_size += sizeof(struct btrfs_tree_block_info);
337
338 BUG_ON(blocks[i] < first_free);
339 BUG_ON(blocks[i] < blocks[i - 1]);
340
341 /* create extent item */
342 itemoff -= item_size;
343 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
344 if (skinny_metadata) {
345 btrfs_set_disk_key_type(&disk_key,
346 BTRFS_METADATA_ITEM_KEY);
347 btrfs_set_disk_key_offset(&disk_key, 0);
348 } else {
349 btrfs_set_disk_key_type(&disk_key,
350 BTRFS_EXTENT_ITEM_KEY);
351 btrfs_set_disk_key_offset(&disk_key, leafsize);
352 }
353 btrfs_set_item_key(buf, &disk_key, nritems);
354 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
355 itemoff);
356 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
357 item_size);
358 extent_item = btrfs_item_ptr(buf, nritems,
359 struct btrfs_extent_item);
360 btrfs_set_extent_refs(buf, extent_item, 1);
361 btrfs_set_extent_generation(buf, extent_item, 1);
362 btrfs_set_extent_flags(buf, extent_item,
363 BTRFS_EXTENT_FLAG_TREE_BLOCK);
364 nritems++;
365
366 /* create extent ref */
367 ref_root = reference_root_table[i];
368 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
369 btrfs_set_disk_key_offset(&disk_key, ref_root);
370 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
371 btrfs_set_item_key(buf, &disk_key, nritems);
372 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
373 itemoff);
374 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
375 nritems++;
376 }
377 btrfs_set_header_bytenr(buf, blocks[2]);
378 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
379 btrfs_set_header_nritems(buf, nritems);
380 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
381 ret = pwrite(fd, buf->data, leafsize, blocks[2]);
382 if (ret != leafsize) {
383 ret = (ret < 0 ? -errno : -EIO);
384 goto out;
385 }
386
387 /* create the chunk tree */
388 memset(buf->data+sizeof(struct btrfs_header), 0,
389 leafsize-sizeof(struct btrfs_header));
390 nritems = 0;
391 item_size = sizeof(*dev_item);
392 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
393
394 /* first device 1 (there is no device 0) */
395 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
396 btrfs_set_disk_key_offset(&disk_key, 1);
397 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
398 btrfs_set_item_key(buf, &disk_key, nritems);
399 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
400 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
401
402 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
403 btrfs_set_device_id(buf, dev_item, 1);
404 btrfs_set_device_generation(buf, dev_item, 0);
405 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
406 btrfs_set_device_bytes_used(buf, dev_item,
407 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
408 btrfs_set_device_io_align(buf, dev_item, sectorsize);
409 btrfs_set_device_io_width(buf, dev_item, sectorsize);
410 btrfs_set_device_sector_size(buf, dev_item, sectorsize);
411 btrfs_set_device_type(buf, dev_item, 0);
412
413 write_extent_buffer(buf, super.dev_item.uuid,
414 (unsigned long)btrfs_device_uuid(dev_item),
415 BTRFS_UUID_SIZE);
416 write_extent_buffer(buf, super.fsid,
417 (unsigned long)btrfs_device_fsid(dev_item),
418 BTRFS_UUID_SIZE);
419 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
420 sizeof(*dev_item));
421
422 nritems++;
423 item_size = btrfs_chunk_item_size(1);
424 itemoff = itemoff - item_size;
425
426 /* then we have chunk 0 */
427 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
428 btrfs_set_disk_key_offset(&disk_key, 0);
429 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
430 btrfs_set_item_key(buf, &disk_key, nritems);
431 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
432 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
433
434 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
435 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
436 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
437 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
438 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
439 btrfs_set_chunk_io_align(buf, chunk, sectorsize);
440 btrfs_set_chunk_io_width(buf, chunk, sectorsize);
441 btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
442 btrfs_set_chunk_num_stripes(buf, chunk, 1);
443 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
444 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
445 nritems++;
446
447 write_extent_buffer(buf, super.dev_item.uuid,
448 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
449 BTRFS_UUID_SIZE);
450
451 /* copy the key for the chunk to the system array */
452 ptr = super.sys_chunk_array;
453 array_size = sizeof(disk_key);
454
455 memcpy(ptr, &disk_key, sizeof(disk_key));
456 ptr += sizeof(disk_key);
457
458 /* copy the chunk to the system array */
459 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
460 array_size += item_size;
461 ptr += item_size;
462 btrfs_set_super_sys_array_size(&super, array_size);
463
464 btrfs_set_header_bytenr(buf, blocks[3]);
465 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
466 btrfs_set_header_nritems(buf, nritems);
467 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
468 ret = pwrite(fd, buf->data, leafsize, blocks[3]);
469 if (ret != leafsize) {
470 ret = (ret < 0 ? -errno : -EIO);
471 goto out;
472 }
473
474 /* create the device tree */
475 memset(buf->data+sizeof(struct btrfs_header), 0,
476 leafsize-sizeof(struct btrfs_header));
477 nritems = 0;
478 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
479 sizeof(struct btrfs_dev_extent);
480
481 btrfs_set_disk_key_objectid(&disk_key, 1);
482 btrfs_set_disk_key_offset(&disk_key, 0);
483 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
484 btrfs_set_item_key(buf, &disk_key, nritems);
485 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
486 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
487 sizeof(struct btrfs_dev_extent));
488 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
489 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
490 BTRFS_CHUNK_TREE_OBJECTID);
491 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
492 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
493 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
494
495 write_extent_buffer(buf, chunk_tree_uuid,
496 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
497 BTRFS_UUID_SIZE);
498
499 btrfs_set_dev_extent_length(buf, dev_extent,
500 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
501 nritems++;
502
503 btrfs_set_header_bytenr(buf, blocks[4]);
504 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
505 btrfs_set_header_nritems(buf, nritems);
506 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
507 ret = pwrite(fd, buf->data, leafsize, blocks[4]);
508 if (ret != leafsize) {
509 ret = (ret < 0 ? -errno : -EIO);
510 goto out;
511 }
512
513 /* create the FS root */
514 memset(buf->data+sizeof(struct btrfs_header), 0,
515 leafsize-sizeof(struct btrfs_header));
516 btrfs_set_header_bytenr(buf, blocks[5]);
517 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
518 btrfs_set_header_nritems(buf, 0);
519 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
520 ret = pwrite(fd, buf->data, leafsize, blocks[5]);
521 if (ret != leafsize) {
522 ret = (ret < 0 ? -errno : -EIO);
523 goto out;
524 }
525 /* finally create the csum root */
526 memset(buf->data+sizeof(struct btrfs_header), 0,
527 leafsize-sizeof(struct btrfs_header));
528 btrfs_set_header_bytenr(buf, blocks[6]);
529 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
530 btrfs_set_header_nritems(buf, 0);
531 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
532 ret = pwrite(fd, buf->data, leafsize, blocks[6]);
533 if (ret != leafsize) {
534 ret = (ret < 0 ? -errno : -EIO);
535 goto out;
536 }
537
538 /* and write out the super block */
539 BUG_ON(sizeof(super) > sectorsize);
540 memset(buf->data, 0, sectorsize);
541 memcpy(buf->data, &super, sizeof(super));
542 buf->len = sectorsize;
543 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
544 ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
545 if (ret != sectorsize) {
546 ret = (ret < 0 ? -errno : -EIO);
547 goto out;
548 }
549
550 ret = 0;
551
552 out:
553 free(buf);
554 return ret;
555 }
556
557 u64 btrfs_device_size(int fd, struct stat *st)
558 {
559 u64 size;
560 if (S_ISREG(st->st_mode)) {
561 return st->st_size;
562 }
563 if (!S_ISBLK(st->st_mode)) {
564 return 0;
565 }
566 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
567 return size;
568 }
569 return 0;
570 }
571
572 static int zero_blocks(int fd, off_t start, size_t len)
573 {
574 char *buf = malloc(len);
575 int ret = 0;
576 ssize_t written;
577
578 if (!buf)
579 return -ENOMEM;
580 memset(buf, 0, len);
581 written = pwrite(fd, buf, len, start);
582 if (written != len)
583 ret = -EIO;
584 free(buf);
585 return ret;
586 }
587
588 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
589
590 /* don't write outside the device by clamping the region to the device size */
591 static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
592 {
593 off_t end = max(start, start + len);
594
595 #ifdef __sparc__
596 /* and don't overwrite the disk labels on sparc */
597 start = max(start, 1024);
598 end = max(end, 1024);
599 #endif
600
601 start = min_t(u64, start, dev_size);
602 end = min_t(u64, end, dev_size);
603
604 return zero_blocks(fd, start, end - start);
605 }
606
607 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
608 struct btrfs_root *root, int fd, char *path,
609 u64 block_count, u32 io_width, u32 io_align,
610 u32 sectorsize)
611 {
612 struct btrfs_super_block *disk_super;
613 struct btrfs_super_block *super = root->fs_info->super_copy;
614 struct btrfs_device *device;
615 struct btrfs_dev_item *dev_item;
616 char *buf;
617 u64 total_bytes;
618 u64 num_devs;
619 int ret;
620
621 device = kzalloc(sizeof(*device), GFP_NOFS);
622 if (!device)
623 return -ENOMEM;
624 buf = kmalloc(sectorsize, GFP_NOFS);
625 if (!buf) {
626 kfree(device);
627 return -ENOMEM;
628 }
629 BUG_ON(sizeof(*disk_super) > sectorsize);
630 memset(buf, 0, sectorsize);
631
632 disk_super = (struct btrfs_super_block *)buf;
633 dev_item = &disk_super->dev_item;
634
635 uuid_generate(device->uuid);
636 device->devid = 0;
637 device->type = 0;
638 device->io_width = io_width;
639 device->io_align = io_align;
640 device->sector_size = sectorsize;
641 device->fd = fd;
642 device->writeable = 1;
643 device->total_bytes = block_count;
644 device->bytes_used = 0;
645 device->total_ios = 0;
646 device->dev_root = root->fs_info->dev_root;
647
648 ret = btrfs_add_device(trans, root, device);
649 BUG_ON(ret);
650
651 total_bytes = btrfs_super_total_bytes(super) + block_count;
652 btrfs_set_super_total_bytes(super, total_bytes);
653
654 num_devs = btrfs_super_num_devices(super) + 1;
655 btrfs_set_super_num_devices(super, num_devs);
656
657 memcpy(disk_super, super, sizeof(*disk_super));
658
659 printf("adding device %s id %llu\n", path,
660 (unsigned long long)device->devid);
661
662 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
663 btrfs_set_stack_device_id(dev_item, device->devid);
664 btrfs_set_stack_device_type(dev_item, device->type);
665 btrfs_set_stack_device_io_align(dev_item, device->io_align);
666 btrfs_set_stack_device_io_width(dev_item, device->io_width);
667 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
668 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
669 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
670 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
671
672 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
673 BUG_ON(ret != sectorsize);
674
675 kfree(buf);
676 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
677 device->fs_devices = root->fs_info->fs_devices;
678 return 0;
679 }
680
681 static void btrfs_wipe_existing_sb(int fd)
682 {
683 const char *off = NULL;
684 size_t len = 0;
685 loff_t offset;
686 char buf[BUFSIZ];
687 int rc = 0;
688 blkid_probe pr = NULL;
689
690 pr = blkid_new_probe();
691 if (!pr)
692 return;
693
694 if (blkid_probe_set_device(pr, fd, 0, 0))
695 goto out;
696
697 rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
698 if (!rc)
699 rc = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
700
701 if (rc || len == 0 || off == NULL)
702 goto out;
703
704 offset = strtoll(off, NULL, 10);
705 if (len > sizeof(buf))
706 len = sizeof(buf);
707
708 memset(buf, 0, len);
709 rc = pwrite(fd, buf, len, offset);
710 fsync(fd);
711
712 out:
713 blkid_free_probe(pr);
714 return;
715 }
716
717 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
718 u64 max_block_count, int *mixed, int discard)
719 {
720 u64 block_count;
721 struct stat st;
722 int i, ret;
723
724 ret = fstat(fd, &st);
725 if (ret < 0) {
726 fprintf(stderr, "unable to stat %s\n", file);
727 return 1;
728 }
729
730 block_count = btrfs_device_size(fd, &st);
731 if (block_count == 0) {
732 fprintf(stderr, "unable to find %s size\n", file);
733 return 1;
734 }
735 if (max_block_count)
736 block_count = min(block_count, max_block_count);
737
738 if (block_count < BTRFS_MKFS_SMALL_VOLUME_SIZE && !(*mixed))
739 *mixed = 1;
740
741 if (discard) {
742 /*
743 * We intentionally ignore errors from the discard ioctl. It
744 * is not necessary for the mkfs functionality but just an
745 * optimization.
746 */
747 if (discard_range(fd, 0, 0) == 0) {
748 fprintf(stderr, "Performing full device TRIM (%s) ...\n",
749 pretty_size(block_count));
750 discard_blocks(fd, 0, block_count);
751 }
752 }
753
754 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
755 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
756 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
757 BTRFS_SUPER_INFO_SIZE, block_count);
758 if (!ret && zero_end)
759 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
760 ZERO_DEV_BYTES, block_count);
761
762 if (ret < 0) {
763 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
764 file, strerror(-ret));
765 return 1;
766 }
767
768 btrfs_wipe_existing_sb(fd);
769
770 *block_count_ret = block_count;
771 return 0;
772 }
773
774 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
775 struct btrfs_root *root, u64 objectid)
776 {
777 int ret;
778 struct btrfs_inode_item inode_item;
779 time_t now = time(NULL);
780
781 memset(&inode_item, 0, sizeof(inode_item));
782 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
783 btrfs_set_stack_inode_size(&inode_item, 0);
784 btrfs_set_stack_inode_nlink(&inode_item, 1);
785 btrfs_set_stack_inode_nbytes(&inode_item, root->leafsize);
786 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
787 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
788 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
789 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
790 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
791 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
792 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
793 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
794 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
795
796 if (root->fs_info->tree_root == root)
797 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
798
799 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
800 if (ret)
801 goto error;
802
803 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
804 if (ret)
805 goto error;
806
807 btrfs_set_root_dirid(&root->root_item, objectid);
808 ret = 0;
809 error:
810 return ret;
811 }
812
813 /*
814 * checks if a path is a block device node
815 * Returns negative errno on failure, otherwise
816 * returns 1 for blockdev, 0 for not-blockdev
817 */
818 int is_block_device(const char *path)
819 {
820 struct stat statbuf;
821
822 if (stat(path, &statbuf) < 0)
823 return -errno;
824
825 return S_ISBLK(statbuf.st_mode);
826 }
827
828 /*
829 * check if given path is a mount point
830 * return 1 if yes. 0 if no. -1 for error
831 */
832 int is_mount_point(const char *path)
833 {
834 FILE *f;
835 struct mntent *mnt;
836 int ret = 0;
837
838 f = setmntent("/proc/self/mounts", "r");
839 if (f == NULL)
840 return -1;
841
842 while ((mnt = getmntent(f)) != NULL) {
843 if (strcmp(mnt->mnt_dir, path))
844 continue;
845 ret = 1;
846 break;
847 }
848 endmntent(f);
849 return ret;
850 }
851
852 /*
853 * Find the mount point for a mounted device.
854 * On success, returns 0 with mountpoint in *mp.
855 * On failure, returns -errno (not mounted yields -EINVAL)
856 * Is noisy on failures, expects to be given a mounted device.
857 */
858 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
859 {
860 int ret;
861 int fd = -1;
862
863 ret = is_block_device(dev);
864 if (ret <= 0) {
865 if (!ret) {
866 fprintf(stderr, "%s is not a block device\n", dev);
867 ret = -EINVAL;
868 } else {
869 fprintf(stderr, "Could not check %s: %s\n",
870 dev, strerror(-ret));
871 }
872 goto out;
873 }
874
875 fd = open(dev, O_RDONLY);
876 if (fd < 0) {
877 ret = -errno;
878 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
879 goto out;
880 }
881
882 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
883 if (!ret) {
884 ret = -EINVAL;
885 } else { /* mounted, all good */
886 ret = 0;
887 }
888 out:
889 if (fd != -1)
890 close(fd);
891 return ret;
892 }
893
894 /*
895 * Given a pathname, return a filehandle to:
896 * the original pathname or,
897 * if the pathname is a mounted btrfs device, to its mountpoint.
898 *
899 * On error, return -1, errno should be set.
900 */
901 int open_path_or_dev_mnt(const char *path, DIR **dirstream)
902 {
903 char mp[BTRFS_PATH_NAME_MAX + 1];
904 int fdmnt;
905
906 if (is_block_device(path)) {
907 int ret;
908
909 ret = get_btrfs_mount(path, mp, sizeof(mp));
910 if (ret < 0) {
911 /* not a mounted btrfs dev */
912 errno = EINVAL;
913 return -1;
914 }
915 fdmnt = open_file_or_dir(mp, dirstream);
916 } else {
917 fdmnt = open_file_or_dir(path, dirstream);
918 }
919
920 return fdmnt;
921 }
922
923 /* checks if a device is a loop device */
924 static int is_loop_device (const char* device) {
925 struct stat statbuf;
926
927 if(stat(device, &statbuf) < 0)
928 return -errno;
929
930 return (S_ISBLK(statbuf.st_mode) &&
931 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
932 }
933
934
935 /* Takes a loop device path (e.g. /dev/loop0) and returns
936 * the associated file (e.g. /images/my_btrfs.img) */
937 static int resolve_loop_device(const char* loop_dev, char* loop_file,
938 int max_len)
939 {
940 int ret;
941 FILE *f;
942 char fmt[20];
943 char p[PATH_MAX];
944 char real_loop_dev[PATH_MAX];
945
946 if (!realpath(loop_dev, real_loop_dev))
947 return -errno;
948 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
949 if (!(f = fopen(p, "r")))
950 return -errno;
951
952 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
953 ret = fscanf(f, fmt, loop_file);
954 fclose(f);
955 if (ret == EOF)
956 return -errno;
957
958 return 0;
959 }
960
961 /* Checks whether a and b are identical or device
962 * files associated with the same block device
963 */
964 static int is_same_blk_file(const char* a, const char* b)
965 {
966 struct stat st_buf_a, st_buf_b;
967 char real_a[PATH_MAX];
968 char real_b[PATH_MAX];
969
970 if(!realpath(a, real_a))
971 strcpy(real_a, a);
972
973 if (!realpath(b, real_b))
974 strcpy(real_b, b);
975
976 /* Identical path? */
977 if(strcmp(real_a, real_b) == 0)
978 return 1;
979
980 if(stat(a, &st_buf_a) < 0 ||
981 stat(b, &st_buf_b) < 0)
982 {
983 if (errno == ENOENT)
984 return 0;
985 return -errno;
986 }
987
988 /* Same blockdevice? */
989 if(S_ISBLK(st_buf_a.st_mode) &&
990 S_ISBLK(st_buf_b.st_mode) &&
991 st_buf_a.st_rdev == st_buf_b.st_rdev)
992 {
993 return 1;
994 }
995
996 /* Hardlink? */
997 if (st_buf_a.st_dev == st_buf_b.st_dev &&
998 st_buf_a.st_ino == st_buf_b.st_ino)
999 {
1000 return 1;
1001 }
1002
1003 return 0;
1004 }
1005
1006 /* checks if a and b are identical or device
1007 * files associated with the same block device or
1008 * if one file is a loop device that uses the other
1009 * file.
1010 */
1011 static int is_same_loop_file(const char* a, const char* b)
1012 {
1013 char res_a[PATH_MAX];
1014 char res_b[PATH_MAX];
1015 const char* final_a = NULL;
1016 const char* final_b = NULL;
1017 int ret;
1018
1019 /* Resolve a if it is a loop device */
1020 if((ret = is_loop_device(a)) < 0) {
1021 if (ret == -ENOENT)
1022 return 0;
1023 return ret;
1024 } else if (ret) {
1025 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1026 if (ret < 0) {
1027 if (errno != EPERM)
1028 return ret;
1029 } else {
1030 final_a = res_a;
1031 }
1032 } else {
1033 final_a = a;
1034 }
1035
1036 /* Resolve b if it is a loop device */
1037 if ((ret = is_loop_device(b)) < 0) {
1038 if (ret == -ENOENT)
1039 return 0;
1040 return ret;
1041 } else if (ret) {
1042 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1043 if (ret < 0) {
1044 if (errno != EPERM)
1045 return ret;
1046 } else {
1047 final_b = res_b;
1048 }
1049 } else {
1050 final_b = b;
1051 }
1052
1053 return is_same_blk_file(final_a, final_b);
1054 }
1055
1056 /* Checks if a file exists and is a block or regular file*/
1057 static int is_existing_blk_or_reg_file(const char* filename)
1058 {
1059 struct stat st_buf;
1060
1061 if(stat(filename, &st_buf) < 0) {
1062 if(errno == ENOENT)
1063 return 0;
1064 else
1065 return -errno;
1066 }
1067
1068 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1069 }
1070
1071 /* Checks if a file is used (directly or indirectly via a loop device)
1072 * by a device in fs_devices
1073 */
1074 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1075 const char* file)
1076 {
1077 int ret;
1078 struct list_head *head;
1079 struct list_head *cur;
1080 struct btrfs_device *device;
1081
1082 head = &fs_devices->devices;
1083 list_for_each(cur, head) {
1084 device = list_entry(cur, struct btrfs_device, dev_list);
1085
1086 if((ret = is_same_loop_file(device->name, file)))
1087 return ret;
1088 }
1089
1090 return 0;
1091 }
1092
1093 /*
1094 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1095 * Returns NULL on invalid input or malloc failure; Other failures
1096 * will be handled by the caller using the input pathame.
1097 */
1098 char *canonicalize_dm_name(const char *ptname)
1099 {
1100 FILE *f;
1101 size_t sz;
1102 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1103
1104 if (!ptname || !*ptname)
1105 return NULL;
1106
1107 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1108 if (!(f = fopen(path, "r")))
1109 return NULL;
1110
1111 /* read <name>\n from sysfs */
1112 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1113 name[sz - 1] = '\0';
1114 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1115
1116 if (access(path, F_OK) == 0)
1117 res = strdup(path);
1118 }
1119 fclose(f);
1120 return res;
1121 }
1122
1123 /*
1124 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1125 * to a device mapper pathname.
1126 * Returns NULL on invalid input or malloc failure; Other failures
1127 * will be handled by the caller using the input pathame.
1128 */
1129 char *canonicalize_path(const char *path)
1130 {
1131 char *canonical, *p;
1132
1133 if (!path || !*path)
1134 return NULL;
1135
1136 canonical = realpath(path, NULL);
1137 if (!canonical)
1138 return strdup(path);
1139 p = strrchr(canonical, '/');
1140 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1141 char *dm = canonicalize_dm_name(p + 1);
1142
1143 if (dm) {
1144 free(canonical);
1145 return dm;
1146 }
1147 }
1148 return canonical;
1149 }
1150
1151 /*
1152 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1153 * is safe to continue.
1154 */
1155 int check_mounted(const char* file)
1156 {
1157 int fd;
1158 int ret;
1159
1160 fd = open(file, O_RDONLY);
1161 if (fd < 0) {
1162 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1163 return -errno;
1164 }
1165
1166 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1167 close(fd);
1168
1169 return ret;
1170 }
1171
1172 int check_mounted_where(int fd, const char *file, char *where, int size,
1173 struct btrfs_fs_devices **fs_dev_ret)
1174 {
1175 int ret;
1176 u64 total_devs = 1;
1177 int is_btrfs;
1178 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1179 FILE *f;
1180 struct mntent *mnt;
1181
1182 /* scan the initial device */
1183 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1184 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1185 is_btrfs = (ret >= 0);
1186
1187 /* scan other devices */
1188 if (is_btrfs && total_devs > 1) {
1189 ret = btrfs_scan_lblkid(!BTRFS_UPDATE_KERNEL);
1190 if (ret)
1191 return ret;
1192 }
1193
1194 /* iterate over the list of currently mountes filesystems */
1195 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1196 return -errno;
1197
1198 while ((mnt = getmntent (f)) != NULL) {
1199 if(is_btrfs) {
1200 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1201 continue;
1202
1203 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1204 } else {
1205 /* ignore entries in the mount table that are not
1206 associated with a file*/
1207 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1208 goto out_mntloop_err;
1209 else if(!ret)
1210 continue;
1211
1212 ret = is_same_loop_file(file, mnt->mnt_fsname);
1213 }
1214
1215 if(ret < 0)
1216 goto out_mntloop_err;
1217 else if(ret)
1218 break;
1219 }
1220
1221 /* Did we find an entry in mnt table? */
1222 if (mnt && size && where) {
1223 strncpy(where, mnt->mnt_dir, size);
1224 where[size-1] = 0;
1225 }
1226 if (fs_dev_ret)
1227 *fs_dev_ret = fs_devices_mnt;
1228
1229 ret = (mnt != NULL);
1230
1231 out_mntloop_err:
1232 endmntent (f);
1233
1234 return ret;
1235 }
1236
1237 struct pending_dir {
1238 struct list_head list;
1239 char name[PATH_MAX];
1240 };
1241
1242 int btrfs_register_one_device(const char *fname)
1243 {
1244 struct btrfs_ioctl_vol_args args;
1245 int fd;
1246 int ret;
1247 int e;
1248
1249 fd = open("/dev/btrfs-control", O_RDWR);
1250 if (fd < 0) {
1251 fprintf(stderr, "failed to open /dev/btrfs-control "
1252 "skipping device registration: %s\n",
1253 strerror(errno));
1254 return -errno;
1255 }
1256 strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
1257 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
1258 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1259 e = errno;
1260 if (ret < 0) {
1261 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1262 fname, strerror(e));
1263 ret = -e;
1264 }
1265 close(fd);
1266 return ret;
1267 }
1268
1269 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1270 int super_offset)
1271 {
1272 struct btrfs_super_block *disk_super;
1273 char *buf;
1274 int ret = 0;
1275
1276 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1277 if (!buf) {
1278 ret = -ENOMEM;
1279 goto out;
1280 }
1281 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1282 if (ret != BTRFS_SUPER_INFO_SIZE)
1283 goto brelse;
1284
1285 ret = 0;
1286 disk_super = (struct btrfs_super_block *)buf;
1287 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1288 goto brelse;
1289
1290 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1291 BTRFS_FSID_SIZE))
1292 ret = 1;
1293 brelse:
1294 free(buf);
1295 out:
1296 return ret;
1297 }
1298
1299 static const char* unit_suffix_binary[] =
1300 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1301 static const char* unit_suffix_decimal[] =
1302 { "B", "kB", "mB", "gB", "tB", "pB", "eB"};
1303
1304 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1305 {
1306 int num_divs;
1307 float fraction;
1308 u64 base = 0;
1309 int mult = 0;
1310 const char** suffix = NULL;
1311 u64 last_size;
1312
1313 if (str_size == 0)
1314 return 0;
1315
1316 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1317 snprintf(str, str_size, "%llu", size);
1318 return 0;
1319 }
1320
1321 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1322 base = 1024;
1323 mult = 1024;
1324 suffix = unit_suffix_binary;
1325 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1326 base = 1000;
1327 mult = 1000;
1328 suffix = unit_suffix_decimal;
1329 }
1330
1331 /* Unknown mode */
1332 if (!base) {
1333 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1334 unit_mode);
1335 assert(0);
1336 return -1;
1337 }
1338
1339 num_divs = 0;
1340 last_size = size;
1341 switch (unit_mode & UNITS_MODE_MASK) {
1342 case UNITS_TBYTES: base *= mult; num_divs++;
1343 case UNITS_GBYTES: base *= mult; num_divs++;
1344 case UNITS_MBYTES: base *= mult; num_divs++;
1345 case UNITS_KBYTES: num_divs++;
1346 break;
1347 case UNITS_BYTES:
1348 base = 1;
1349 num_divs = 0;
1350 break;
1351 default:
1352 while (size >= mult) {
1353 last_size = size;
1354 size /= mult;
1355 num_divs++;
1356 }
1357 }
1358
1359 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1360 str[0] = '\0';
1361 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1362 num_divs);
1363 assert(0);
1364 return -1;
1365 }
1366 fraction = (float)last_size / base;
1367
1368 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1369 }
1370
1371 /*
1372 * __strncpy__null - strncpy with null termination
1373 * @dest: the target array
1374 * @src: the source string
1375 * @n: maximum bytes to copy (size of *dest)
1376 *
1377 * Like strncpy, but ensures destination is null-terminated.
1378 *
1379 * Copies the string pointed to by src, including the terminating null
1380 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1381 * of n bytes. Then ensure that dest is null-terminated.
1382 */
1383 char *__strncpy__null(char *dest, const char *src, size_t n)
1384 {
1385 strncpy(dest, src, n);
1386 if (n > 0)
1387 dest[n - 1] = '\0';
1388 return dest;
1389 }
1390
1391 /*
1392 * Checks to make sure that the label matches our requirements.
1393 * Returns:
1394 0 if everything is safe and usable
1395 -1 if the label is too long
1396 */
1397 static int check_label(const char *input)
1398 {
1399 int len = strlen(input);
1400
1401 if (len > BTRFS_LABEL_SIZE - 1) {
1402 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1403 input, BTRFS_LABEL_SIZE - 1);
1404 return -1;
1405 }
1406
1407 return 0;
1408 }
1409
1410 static int set_label_unmounted(const char *dev, const char *label)
1411 {
1412 struct btrfs_trans_handle *trans;
1413 struct btrfs_root *root;
1414 int ret;
1415
1416 ret = check_mounted(dev);
1417 if (ret < 0) {
1418 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1419 return -1;
1420 }
1421 if (ret > 0) {
1422 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1423 dev);
1424 return -1;
1425 }
1426
1427 /* Open the super_block at the default location
1428 * and as read-write.
1429 */
1430 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1431 if (!root) /* errors are printed by open_ctree() */
1432 return -1;
1433
1434 trans = btrfs_start_transaction(root, 1);
1435 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1436 label);
1437 btrfs_commit_transaction(trans, root);
1438
1439 /* Now we close it since we are done. */
1440 close_ctree(root);
1441 return 0;
1442 }
1443
1444 static int set_label_mounted(const char *mount_path, const char *label)
1445 {
1446 int fd;
1447
1448 fd = open(mount_path, O_RDONLY | O_NOATIME);
1449 if (fd < 0) {
1450 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1451 return -1;
1452 }
1453
1454 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1455 fprintf(stderr, "ERROR: unable to set label %s\n",
1456 strerror(errno));
1457 close(fd);
1458 return -1;
1459 }
1460
1461 close(fd);
1462 return 0;
1463 }
1464
1465 static int get_label_unmounted(const char *dev, char *label)
1466 {
1467 struct btrfs_root *root;
1468 int ret;
1469
1470 ret = check_mounted(dev);
1471 if (ret < 0) {
1472 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1473 return -1;
1474 }
1475 if (ret > 0) {
1476 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1477 dev);
1478 return -1;
1479 }
1480
1481 /* Open the super_block at the default location
1482 * and as read-only.
1483 */
1484 root = open_ctree(dev, 0, 0);
1485 if(!root)
1486 return -1;
1487
1488 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1489
1490 /* Now we close it since we are done. */
1491 close_ctree(root);
1492 return 0;
1493 }
1494
1495 /*
1496 * If a partition is mounted, try to get the filesystem label via its
1497 * mounted path rather than device. Return the corresponding error
1498 * the user specified the device path.
1499 */
1500 int get_label_mounted(const char *mount_path, char *labelp)
1501 {
1502 char label[BTRFS_LABEL_SIZE];
1503 int fd;
1504
1505 fd = open(mount_path, O_RDONLY | O_NOATIME);
1506 if (fd < 0) {
1507 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1508 return -1;
1509 }
1510
1511 memset(label, '\0', sizeof(label));
1512 if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
1513 fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
1514 close(fd);
1515 return -1;
1516 }
1517
1518 strncpy(labelp, label, sizeof(label));
1519 close(fd);
1520 return 0;
1521 }
1522
1523 int get_label(const char *btrfs_dev, char *label)
1524 {
1525 int ret;
1526
1527 ret = is_existing_blk_or_reg_file(btrfs_dev);
1528 if (!ret)
1529 ret = get_label_mounted(btrfs_dev, label);
1530 else if (ret > 0)
1531 ret = get_label_unmounted(btrfs_dev, label);
1532
1533 return ret;
1534 }
1535
1536 int set_label(const char *btrfs_dev, const char *label)
1537 {
1538 int ret;
1539
1540 if (check_label(label))
1541 return -1;
1542
1543 ret = is_existing_blk_or_reg_file(btrfs_dev);
1544 if (!ret)
1545 ret = set_label_mounted(btrfs_dev, label);
1546 else if (ret > 0)
1547 ret = set_label_unmounted(btrfs_dev, label);
1548
1549 return ret;
1550 }
1551
1552 int btrfs_scan_block_devices(int run_ioctl)
1553 {
1554
1555 struct stat st;
1556 int ret;
1557 int fd;
1558 struct btrfs_fs_devices *tmp_devices;
1559 u64 num_devices;
1560 FILE *proc_partitions;
1561 int i;
1562 char buf[1024];
1563 char fullpath[110];
1564 int scans = 0;
1565 int special;
1566
1567 scan_again:
1568 proc_partitions = fopen("/proc/partitions","r");
1569 if (!proc_partitions) {
1570 fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
1571 return -ENOENT;
1572 }
1573 /* skip the header */
1574 for (i = 0; i < 2; i++)
1575 if (!fgets(buf, 1023, proc_partitions)) {
1576 fprintf(stderr,
1577 "Unable to read '/proc/partitions' for scanning\n");
1578 fclose(proc_partitions);
1579 return -ENOENT;
1580 }
1581
1582 strcpy(fullpath,"/dev/");
1583 while(fgets(buf, 1023, proc_partitions)) {
1584 ret = sscanf(buf," %*d %*d %*d %99s", fullpath + 5);
1585 if (ret != 1) {
1586 fprintf(stderr,
1587 "failed to scan device name from /proc/partitions\n");
1588 break;
1589 }
1590
1591 /*
1592 * multipath and MD devices may register as a btrfs filesystem
1593 * both through the original block device and through
1594 * the special (/dev/mapper or /dev/mdX) entry.
1595 * This scans the special entries last
1596 */
1597 special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
1598 if (!special)
1599 special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
1600
1601 if (scans == 0 && special)
1602 continue;
1603 if (scans > 0 && !special)
1604 continue;
1605
1606 ret = lstat(fullpath, &st);
1607 if (ret < 0) {
1608 fprintf(stderr, "failed to stat %s\n", fullpath);
1609 continue;
1610 }
1611 if (!S_ISBLK(st.st_mode)) {
1612 continue;
1613 }
1614
1615 fd = open(fullpath, O_RDONLY);
1616 if (fd < 0) {
1617 if (errno != ENOMEDIUM)
1618 fprintf(stderr, "failed to open %s: %s\n",
1619 fullpath, strerror(errno));
1620 continue;
1621 }
1622 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1623 &num_devices,
1624 BTRFS_SUPER_INFO_OFFSET, 0);
1625 if (ret == 0 && run_ioctl > 0) {
1626 btrfs_register_one_device(fullpath);
1627 }
1628 close(fd);
1629 }
1630
1631 fclose(proc_partitions);
1632
1633 if (scans == 0) {
1634 scans++;
1635 goto scan_again;
1636 }
1637 return 0;
1638 }
1639
1640 /*
1641 * A not-so-good version fls64. No fascinating optimization since
1642 * no one except parse_size use it
1643 */
1644 static int fls64(u64 x)
1645 {
1646 int i;
1647
1648 for (i = 0; i <64; i++)
1649 if (x << i & (1ULL << 63))
1650 return 64 - i;
1651 return 64 - i;
1652 }
1653
1654 u64 parse_size(char *s)
1655 {
1656 char c;
1657 char *endptr;
1658 u64 mult = 1;
1659 u64 ret;
1660
1661 if (!s) {
1662 fprintf(stderr, "ERROR: Size value is empty\n");
1663 exit(1);
1664 }
1665 if (s[0] == '-') {
1666 fprintf(stderr,
1667 "ERROR: Size value '%s' is less equal than 0\n", s);
1668 exit(1);
1669 }
1670 ret = strtoull(s, &endptr, 10);
1671 if (endptr == s) {
1672 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1673 exit(1);
1674 }
1675 if (endptr[0] && endptr[1]) {
1676 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1677 endptr[1]);
1678 exit(1);
1679 }
1680 /*
1681 * strtoll returns LLONG_MAX when overflow, if this happens,
1682 * need to call strtoull to get the real size
1683 */
1684 if (errno == ERANGE && ret == ULLONG_MAX) {
1685 fprintf(stderr,
1686 "ERROR: Size value '%s' is too large for u64\n", s);
1687 exit(1);
1688 }
1689 if (endptr[0]) {
1690 c = tolower(endptr[0]);
1691 switch (c) {
1692 case 'e':
1693 mult *= 1024;
1694 /* fallthrough */
1695 case 'p':
1696 mult *= 1024;
1697 /* fallthrough */
1698 case 't':
1699 mult *= 1024;
1700 /* fallthrough */
1701 case 'g':
1702 mult *= 1024;
1703 /* fallthrough */
1704 case 'm':
1705 mult *= 1024;
1706 /* fallthrough */
1707 case 'k':
1708 mult *= 1024;
1709 /* fallthrough */
1710 case 'b':
1711 break;
1712 default:
1713 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1714 c);
1715 exit(1);
1716 }
1717 }
1718 /* Check whether ret * mult overflow */
1719 if (fls64(ret) + fls64(mult) - 1 > 64) {
1720 fprintf(stderr,
1721 "ERROR: Size value '%s' is too large for u64\n", s);
1722 exit(1);
1723 }
1724 ret *= mult;
1725 return ret;
1726 }
1727
1728 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
1729 {
1730 int ret;
1731 struct stat st;
1732 int fd;
1733
1734 ret = stat(fname, &st);
1735 if (ret < 0) {
1736 return -1;
1737 }
1738 if (S_ISDIR(st.st_mode)) {
1739 *dirstream = opendir(fname);
1740 if (!*dirstream)
1741 return -1;
1742 fd = dirfd(*dirstream);
1743 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
1744 fd = open(fname, open_flags);
1745 } else {
1746 /*
1747 * we set this on purpose, in case the caller output
1748 * strerror(errno) as success
1749 */
1750 errno = EINVAL;
1751 return -1;
1752 }
1753 if (fd < 0) {
1754 fd = -1;
1755 if (*dirstream)
1756 closedir(*dirstream);
1757 }
1758 return fd;
1759 }
1760
1761 int open_file_or_dir(const char *fname, DIR **dirstream)
1762 {
1763 return open_file_or_dir3(fname, dirstream, O_RDWR);
1764 }
1765
1766 void close_file_or_dir(int fd, DIR *dirstream)
1767 {
1768 if (dirstream)
1769 closedir(dirstream);
1770 else if (fd >= 0)
1771 close(fd);
1772 }
1773
1774 int get_device_info(int fd, u64 devid,
1775 struct btrfs_ioctl_dev_info_args *di_args)
1776 {
1777 int ret;
1778
1779 di_args->devid = devid;
1780 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
1781
1782 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
1783 return ret ? -errno : 0;
1784 }
1785
1786 /*
1787 * For a given path, fill in the ioctl fs_ and info_ args.
1788 * If the path is a btrfs mountpoint, fill info for all devices.
1789 * If the path is a btrfs device, fill in only that device.
1790 *
1791 * The path provided must be either on a mounted btrfs fs,
1792 * or be a mounted btrfs device.
1793 *
1794 * Returns 0 on success, or a negative errno.
1795 */
1796 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
1797 struct btrfs_ioctl_dev_info_args **di_ret)
1798 {
1799 int fd = -1;
1800 int ret = 0;
1801 int ndevs = 0;
1802 int i = 0;
1803 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1804 struct btrfs_ioctl_dev_info_args *di_args;
1805 char mp[BTRFS_PATH_NAME_MAX + 1];
1806 DIR *dirstream = NULL;
1807
1808 memset(fi_args, 0, sizeof(*fi_args));
1809
1810 if (is_block_device(path)) {
1811 struct btrfs_super_block *disk_super;
1812 char buf[BTRFS_SUPER_INFO_SIZE];
1813 u64 devid;
1814
1815 /* Ensure it's mounted, then set path to the mountpoint */
1816 fd = open(path, O_RDONLY);
1817 if (fd < 0) {
1818 ret = -errno;
1819 fprintf(stderr, "Couldn't open %s: %s\n",
1820 path, strerror(errno));
1821 goto out;
1822 }
1823 ret = check_mounted_where(fd, path, mp, sizeof(mp),
1824 &fs_devices_mnt);
1825 if (!ret) {
1826 ret = -EINVAL;
1827 goto out;
1828 }
1829 if (ret < 0)
1830 goto out;
1831 path = mp;
1832 /* Only fill in this one device */
1833 fi_args->num_devices = 1;
1834
1835 disk_super = (struct btrfs_super_block *)buf;
1836 ret = btrfs_read_dev_super(fd, disk_super,
1837 BTRFS_SUPER_INFO_OFFSET, 0);
1838 if (ret < 0) {
1839 ret = -EIO;
1840 goto out;
1841 }
1842 devid = btrfs_stack_device_id(&disk_super->dev_item);
1843
1844 fi_args->max_id = devid;
1845 i = devid;
1846
1847 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
1848 close(fd);
1849 }
1850
1851 /* at this point path must not be for a block device */
1852 fd = open_file_or_dir(path, &dirstream);
1853 if (fd < 0) {
1854 ret = -errno;
1855 goto out;
1856 }
1857
1858 /* fill in fi_args if not just a single device */
1859 if (fi_args->num_devices != 1) {
1860 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
1861 if (ret < 0) {
1862 ret = -errno;
1863 goto out;
1864 }
1865 }
1866
1867 if (!fi_args->num_devices)
1868 goto out;
1869
1870 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
1871 if (!di_args) {
1872 ret = -errno;
1873 goto out;
1874 }
1875
1876 for (; i <= fi_args->max_id; ++i) {
1877 BUG_ON(ndevs >= fi_args->num_devices);
1878 ret = get_device_info(fd, i, &di_args[ndevs]);
1879 if (ret == -ENODEV)
1880 continue;
1881 if (ret)
1882 goto out;
1883 ndevs++;
1884 }
1885
1886 /*
1887 * only when the only dev we wanted to find is not there then
1888 * let any error be returned
1889 */
1890 if (fi_args->num_devices != 1) {
1891 BUG_ON(ndevs == 0);
1892 ret = 0;
1893 }
1894
1895 out:
1896 close_file_or_dir(fd, dirstream);
1897 return ret;
1898 }
1899
1900 #define isoctal(c) (((c) & ~7) == '0')
1901
1902 static inline void translate(char *f, char *t)
1903 {
1904 while (*f != '\0') {
1905 if (*f == '\\' &&
1906 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
1907 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
1908 f += 4;
1909 } else
1910 *t++ = *f++;
1911 }
1912 *t = '\0';
1913 return;
1914 }
1915
1916 /*
1917 * Checks if the swap device.
1918 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
1919 */
1920 static int is_swap_device(const char *file)
1921 {
1922 FILE *f;
1923 struct stat st_buf;
1924 dev_t dev;
1925 ino_t ino = 0;
1926 char tmp[PATH_MAX];
1927 char buf[PATH_MAX];
1928 char *cp;
1929 int ret = 0;
1930
1931 if (stat(file, &st_buf) < 0)
1932 return -errno;
1933 if (S_ISBLK(st_buf.st_mode))
1934 dev = st_buf.st_rdev;
1935 else if (S_ISREG(st_buf.st_mode)) {
1936 dev = st_buf.st_dev;
1937 ino = st_buf.st_ino;
1938 } else
1939 return 0;
1940
1941 if ((f = fopen("/proc/swaps", "r")) == NULL)
1942 return 0;
1943
1944 /* skip the first line */
1945 if (fgets(tmp, sizeof(tmp), f) == NULL)
1946 goto out;
1947
1948 while (fgets(tmp, sizeof(tmp), f) != NULL) {
1949 if ((cp = strchr(tmp, ' ')) != NULL)
1950 *cp = '\0';
1951 if ((cp = strchr(tmp, '\t')) != NULL)
1952 *cp = '\0';
1953 translate(tmp, buf);
1954 if (stat(buf, &st_buf) != 0)
1955 continue;
1956 if (S_ISBLK(st_buf.st_mode)) {
1957 if (dev == st_buf.st_rdev) {
1958 ret = 1;
1959 break;
1960 }
1961 } else if (S_ISREG(st_buf.st_mode)) {
1962 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
1963 ret = 1;
1964 break;
1965 }
1966 }
1967 }
1968
1969 out:
1970 fclose(f);
1971
1972 return ret;
1973 }
1974
1975 /*
1976 * Check for existing filesystem or partition table on device.
1977 * Returns:
1978 * 1 for existing fs or partition
1979 * 0 for nothing found
1980 * -1 for internal error
1981 */
1982 static int
1983 check_overwrite(
1984 char *device)
1985 {
1986 const char *type;
1987 blkid_probe pr = NULL;
1988 int ret;
1989 blkid_loff_t size;
1990
1991 if (!device || !*device)
1992 return 0;
1993
1994 ret = -1; /* will reset on success of all setup calls */
1995
1996 pr = blkid_new_probe_from_filename(device);
1997 if (!pr)
1998 goto out;
1999
2000 size = blkid_probe_get_size(pr);
2001 if (size < 0)
2002 goto out;
2003
2004 /* nothing to overwrite on a 0-length device */
2005 if (size == 0) {
2006 ret = 0;
2007 goto out;
2008 }
2009
2010 ret = blkid_probe_enable_partitions(pr, 1);
2011 if (ret < 0)
2012 goto out;
2013
2014 ret = blkid_do_fullprobe(pr);
2015 if (ret < 0)
2016 goto out;
2017
2018 /*
2019 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2020 * but we want the exact opposite, so reverse the return value here.
2021 *
2022 * In addition print some useful diagnostics about what actually is
2023 * on the device.
2024 */
2025 if (ret) {
2026 ret = 0;
2027 goto out;
2028 }
2029
2030 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2031 fprintf(stderr,
2032 "%s appears to contain an existing "
2033 "filesystem (%s).\n", device, type);
2034 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2035 fprintf(stderr,
2036 "%s appears to contain a partition "
2037 "table (%s).\n", device, type);
2038 } else {
2039 fprintf(stderr,
2040 "%s appears to contain something weird "
2041 "according to blkid\n", device);
2042 }
2043 ret = 1;
2044
2045 out:
2046 if (pr)
2047 blkid_free_probe(pr);
2048 if (ret == -1)
2049 fprintf(stderr,
2050 "probe of %s failed, cannot detect "
2051 "existing filesystem.\n", device);
2052 return ret;
2053 }
2054
2055 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2056 u64 dev_cnt, int mixed, char *estr)
2057 {
2058 size_t sz = 100;
2059 u64 allowed = 0;
2060
2061 switch (dev_cnt) {
2062 default:
2063 case 4:
2064 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2065 case 3:
2066 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2067 case 2:
2068 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2069 BTRFS_BLOCK_GROUP_RAID5;
2070 break;
2071 case 1:
2072 allowed |= BTRFS_BLOCK_GROUP_DUP;
2073 }
2074
2075 if (metadata_profile & ~allowed) {
2076 snprintf(estr, sz, "unable to create FS with metadata "
2077 "profile %llu (have %llu devices)\n",
2078 metadata_profile, dev_cnt);
2079 return 1;
2080 }
2081 if (data_profile & ~allowed) {
2082 snprintf(estr, sz, "unable to create FS with data "
2083 "profile %llu (have %llu devices)\n",
2084 metadata_profile, dev_cnt);
2085 return 1;
2086 }
2087
2088 if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
2089 snprintf(estr, sz,
2090 "dup for data is allowed only in mixed mode");
2091 return 1;
2092 }
2093 return 0;
2094 }
2095
2096 /* Check if disk is suitable for btrfs
2097 * returns:
2098 * 1: something is wrong, estr provides the error
2099 * 0: all is fine
2100 */
2101 int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
2102 {
2103 int ret, fd;
2104 size_t sz = 100;
2105 struct stat st;
2106
2107 ret = is_swap_device(file);
2108 if (ret < 0) {
2109 snprintf(estr, sz, "error checking %s status: %s\n", file,
2110 strerror(-ret));
2111 return 1;
2112 }
2113 if (ret == 1) {
2114 snprintf(estr, sz, "%s is a swap device\n", file);
2115 return 1;
2116 }
2117 if (!force_overwrite) {
2118 if (check_overwrite(file)) {
2119 snprintf(estr, sz, "Use the -f option to force overwrite.\n");
2120 return 1;
2121 }
2122 }
2123 ret = check_mounted(file);
2124 if (ret < 0) {
2125 snprintf(estr, sz, "error checking %s mount status\n",
2126 file);
2127 return 1;
2128 }
2129 if (ret == 1) {
2130 snprintf(estr, sz, "%s is mounted\n", file);
2131 return 1;
2132 }
2133 /* check if the device is busy */
2134 fd = open(file, O_RDWR|O_EXCL);
2135 if (fd < 0) {
2136 snprintf(estr, sz, "unable to open %s: %s\n", file,
2137 strerror(errno));
2138 return 1;
2139 }
2140 if (fstat(fd, &st)) {
2141 snprintf(estr, sz, "unable to stat %s: %s\n", file,
2142 strerror(errno));
2143 close(fd);
2144 return 1;
2145 }
2146 if (!S_ISBLK(st.st_mode)) {
2147 fprintf(stderr, "'%s' is not a block device\n", file);
2148 close(fd);
2149 return 1;
2150 }
2151 close(fd);
2152 return 0;
2153 }
2154
2155 int btrfs_scan_lblkid(int update_kernel)
2156 {
2157 int fd = -1;
2158 int ret;
2159 u64 num_devices;
2160 struct btrfs_fs_devices *tmp_devices;
2161 blkid_dev_iterate iter = NULL;
2162 blkid_dev dev = NULL;
2163 blkid_cache cache = NULL;
2164 char path[PATH_MAX];
2165
2166 if (blkid_get_cache(&cache, 0) < 0) {
2167 printf("ERROR: lblkid cache get failed\n");
2168 return 1;
2169 }
2170 blkid_probe_all(cache);
2171 iter = blkid_dev_iterate_begin(cache);
2172 blkid_dev_set_search(iter, "TYPE", "btrfs");
2173 while (blkid_dev_next(iter, &dev) == 0) {
2174 dev = blkid_verify(cache, dev);
2175 if (!dev)
2176 continue;
2177 /* if we are here its definitely a btrfs disk*/
2178 strncpy(path, blkid_dev_devname(dev), PATH_MAX);
2179
2180 fd = open(path, O_RDONLY);
2181 if (fd < 0) {
2182 printf("ERROR: could not open %s\n", path);
2183 continue;
2184 }
2185 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2186 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2187 if (ret) {
2188 printf("ERROR: could not scan %s\n", path);
2189 close (fd);
2190 continue;
2191 }
2192
2193 close(fd);
2194 if (update_kernel)
2195 btrfs_register_one_device(path);
2196 }
2197 blkid_dev_iterate_end(iter);
2198 blkid_put_cache(cache);
2199 return 0;
2200 }
2201
2202 int is_vol_small(char *file)
2203 {
2204 int fd = -1;
2205 int e;
2206 struct stat st;
2207 u64 size;
2208
2209 fd = open(file, O_RDONLY);
2210 if (fd < 0)
2211 return -errno;
2212 if (fstat(fd, &st) < 0) {
2213 e = -errno;
2214 close(fd);
2215 return e;
2216 }
2217 size = btrfs_device_size(fd, &st);
2218 if (size == 0) {
2219 close(fd);
2220 return -1;
2221 }
2222 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2223 close(fd);
2224 return 1;
2225 } else {
2226 close(fd);
2227 return 0;
2228 }
2229 }
2230
2231 /*
2232 * This reads a line from the stdin and only returns non-zero if the
2233 * first whitespace delimited token is a case insensitive match with yes
2234 * or y.
2235 */
2236 int ask_user(char *question)
2237 {
2238 char buf[30] = {0,};
2239 char *saveptr = NULL;
2240 char *answer;
2241
2242 printf("%s [y/N]: ", question);
2243
2244 return fgets(buf, sizeof(buf) - 1, stdin) &&
2245 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2246 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2247 }
2248
2249 /*
2250 * For a given:
2251 * - file or directory return the containing tree root id
2252 * - subvolume return its own tree id
2253 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2254 * undefined and function returns -1
2255 */
2256 int lookup_ino_rootid(int fd, u64 *rootid)
2257 {
2258 struct btrfs_ioctl_ino_lookup_args args;
2259 int ret;
2260 int e;
2261
2262 memset(&args, 0, sizeof(args));
2263 args.treeid = 0;
2264 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2265
2266 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2267 e = errno;
2268 if (ret) {
2269 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2270 strerror(e));
2271 return ret;
2272 }
2273
2274 *rootid = args.treeid;
2275
2276 return 0;
2277 }
2278
2279 /*
2280 * return 0 if a btrfs mount point is found
2281 * return 1 if a mount point is found but not btrfs
2282 * return <0 if something goes wrong
2283 */
2284 int find_mount_root(const char *path, char **mount_root)
2285 {
2286 FILE *mnttab;
2287 int fd;
2288 struct mntent *ent;
2289 int len;
2290 int ret;
2291 int not_btrfs = 1;
2292 int longest_matchlen = 0;
2293 char *longest_match = NULL;
2294
2295 fd = open(path, O_RDONLY | O_NOATIME);
2296 if (fd < 0)
2297 return -errno;
2298 close(fd);
2299
2300 mnttab = setmntent("/proc/self/mounts", "r");
2301 if (!mnttab)
2302 return -errno;
2303
2304 while ((ent = getmntent(mnttab))) {
2305 len = strlen(ent->mnt_dir);
2306 if (strncmp(ent->mnt_dir, path, len) == 0) {
2307 /* match found and use the latest match */
2308 if (longest_matchlen <= len) {
2309 free(longest_match);
2310 longest_matchlen = len;
2311 longest_match = strdup(ent->mnt_dir);
2312 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2313 }
2314 }
2315 }
2316 endmntent(mnttab);
2317
2318 if (!longest_match)
2319 return -ENOENT;
2320 if (not_btrfs) {
2321 free(longest_match);
2322 return 1;
2323 }
2324
2325 ret = 0;
2326 *mount_root = realpath(longest_match, NULL);
2327 if (!*mount_root)
2328 ret = -errno;
2329
2330 free(longest_match);
2331 return ret;
2332 }
2333
2334 int test_minimum_size(const char *file, u32 leafsize)
2335 {
2336 int fd;
2337 struct stat statbuf;
2338
2339 fd = open(file, O_RDONLY);
2340 if (fd < 0)
2341 return -errno;
2342 if (stat(file, &statbuf) < 0) {
2343 close(fd);
2344 return -errno;
2345 }
2346 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(leafsize)) {
2347 close(fd);
2348 return 1;
2349 }
2350 close(fd);
2351 return 0;
2352 }
2353
2354 /*
2355 * test if name is a correct subvolume name
2356 * this function return
2357 * 0-> name is not a correct subvolume name
2358 * 1-> name is a correct subvolume name
2359 */
2360 int test_issubvolname(const char *name)
2361 {
2362 return name[0] != '\0' && !strchr(name, '/') &&
2363 strcmp(name, ".") && strcmp(name, "..");
2364 }
2365
2366 /*
2367 * test if path is a directory
2368 * this function return
2369 * 0-> path exists but it is not a directory
2370 * 1-> path exists and it is a directory
2371 * -1 -> path is unaccessible
2372 */
2373 int test_isdir(const char *path)
2374 {
2375 struct stat st;
2376 int ret;
2377
2378 ret = stat(path, &st);
2379 if(ret < 0 )
2380 return -1;
2381
2382 return S_ISDIR(st.st_mode);
2383 }
2384
2385 void units_set_mode(unsigned *units, unsigned mode)
2386 {
2387 unsigned base = *units & UNITS_MODE_MASK;
2388
2389 *units = base | mode;
2390 }
2391
2392 void units_set_base(unsigned *units, unsigned base)
2393 {
2394 unsigned mode = *units & ~UNITS_MODE_MASK;
2395
2396 *units = base | mode;
2397 }
2398
2399 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2400 {
2401 int level;
2402
2403 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2404 if (!path->nodes[level])
2405 break;
2406 if (path->slots[level] + 1 >=
2407 btrfs_header_nritems(path->nodes[level]))
2408 continue;
2409 if (level == 0)
2410 btrfs_item_key_to_cpu(path->nodes[level], key,
2411 path->slots[level] + 1);
2412 else
2413 btrfs_node_key_to_cpu(path->nodes[level], key,
2414 path->slots[level] + 1);
2415 return 0;
2416 }
2417 return 1;
2418 }
(deprecated) Btrfs progs developments and patch integration