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Fix a few casts for 32 bit compile
[btrfs-progs-unstable.git] / utils.c
blob0015ee2764e5905f414cce4c780ad0b92c98d0e7
1 /*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19 #define _XOPEN_SOURCE 600
20 #define __USE_XOPEN2K
21 #include <stdio.h>
22 #include <stdlib.h>
23 #ifndef __CHECKER__
24 #include <sys/ioctl.h>
25 #include <sys/mount.h>
26 #endif
27 #include <sys/types.h>
28 #include <sys/stat.h>
29 #include <uuid/uuid.h>
30 #include <dirent.h>
31 #include <fcntl.h>
32 #include <unistd.h>
33 #include <mntent.h>
34 #include "kerncompat.h"
35 #include "radix-tree.h"
36 #include "ctree.h"
37 #include "disk-io.h"
38 #include "transaction.h"
39 #include "crc32c.h"
40 #include "utils.h"
41 #include "volumes.h"
42 #include "ioctl.h"
43
44 #ifdef __CHECKER__
45 #define BLKGETSIZE64 0
46 static inline int ioctl(int fd, int define, u64 *size) { return 0; }
47 #endif
48
49 static u64 reference_root_table[6] = {
50 [1] = BTRFS_ROOT_TREE_OBJECTID,
51 [2] = BTRFS_EXTENT_TREE_OBJECTID,
52 [3] = BTRFS_CHUNK_TREE_OBJECTID,
53 [4] = BTRFS_DEV_TREE_OBJECTID,
54 [5] = BTRFS_FS_TREE_OBJECTID,
55 };
56
57 int make_btrfs(int fd, char *device_name,
58 u64 blocks[6], u64 num_bytes, u32 nodesize,
59 u32 leafsize, u32 sectorsize, u32 stripesize)
60 {
61 struct btrfs_super_block super;
62 struct extent_buffer *buf;
63 struct btrfs_root_item root_item;
64 struct btrfs_disk_key disk_key;
65 struct btrfs_extent_ref *extent_ref;
66 struct btrfs_extent_item *extent_item;
67 struct btrfs_inode_item *inode_item;
68 struct btrfs_chunk *chunk;
69 struct btrfs_dev_item *dev_item;
70 struct btrfs_dev_extent *dev_extent;
71 u8 *ptr;
72 int i;
73 int ret;
74 u32 itemoff;
75 u32 nritems = 0;
76 u64 hash;
77 u64 first_free;
78 u64 ref_gen;
79 u64 ref_root;
80 u32 array_size;
81 u32 item_size;
82
83 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
84 first_free &= ~((u64)sectorsize - 1);
85
86 num_bytes = (num_bytes / sectorsize) * sectorsize;
87 uuid_generate(super.fsid);
88 btrfs_set_super_bytenr(&super, blocks[0]);
89 btrfs_set_super_num_devices(&super, 1);
90 strncpy((char *)&super.magic, BTRFS_MAGIC, sizeof(super.magic));
91 btrfs_set_super_generation(&super, 1);
92 btrfs_set_super_root(&super, blocks[1]);
93 btrfs_set_super_chunk_root(&super, blocks[3]);
94 btrfs_set_super_total_bytes(&super, num_bytes);
95 btrfs_set_super_bytes_used(&super, first_free + 5 * leafsize);
96 btrfs_set_super_root_dir(&super, 0);
97 btrfs_set_super_sectorsize(&super, sectorsize);
98 btrfs_set_super_leafsize(&super, leafsize);
99 btrfs_set_super_nodesize(&super, nodesize);
100 btrfs_set_super_stripesize(&super, stripesize);
101 btrfs_set_super_root_level(&super, 0);
102 btrfs_set_super_chunk_root_level(&super, 0);
103 btrfs_set_super_sys_array_size(&super, 0);
104
105 buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
106
107 /* create the tree of root objects */
108 memset(buf->data, 0, leafsize);
109 buf->len = leafsize;
110 btrfs_set_header_bytenr(buf, blocks[1]);
111 btrfs_set_header_nritems(buf, 3);
112 btrfs_set_header_generation(buf, 1);
113 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
114 write_extent_buffer(buf, super.fsid, (unsigned long)
115 btrfs_header_fsid(buf), BTRFS_FSID_SIZE);
116
117 /* create the items for the root tree */
118 memset(&root_item, 0, sizeof(root_item));
119 inode_item = &root_item.inode;
120 btrfs_set_stack_inode_generation(inode_item, 1);
121 btrfs_set_stack_inode_size(inode_item, 3);
122 btrfs_set_stack_inode_nlink(inode_item, 1);
123 btrfs_set_stack_inode_nblocks(inode_item, 1);
124 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
125 btrfs_set_root_refs(&root_item, 1);
126 btrfs_set_root_used(&root_item, leafsize);
127
128 memset(&disk_key, 0, sizeof(disk_key));
129 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
130 btrfs_set_disk_key_offset(&disk_key, 0);
131 nritems = 0;
132
133 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
134 btrfs_set_root_bytenr(&root_item, blocks[2]);
135 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
136 btrfs_set_item_key(buf, &disk_key, nritems);
137 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
138 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
139 sizeof(root_item));
140 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
141 nritems), sizeof(root_item));
142 nritems++;
143
144 itemoff = itemoff - sizeof(root_item);
145 btrfs_set_root_bytenr(&root_item, blocks[4]);
146 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
147 btrfs_set_item_key(buf, &disk_key, nritems);
148 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
149 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
150 sizeof(root_item));
151 write_extent_buffer(buf, &root_item,
152 btrfs_item_ptr_offset(buf, nritems),
153 sizeof(root_item));
154 nritems++;
155
156 itemoff = itemoff - sizeof(root_item);
157 btrfs_set_root_bytenr(&root_item, blocks[5]);
158 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
159 btrfs_set_item_key(buf, &disk_key, nritems);
160 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
161 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
162 sizeof(root_item));
163 write_extent_buffer(buf, &root_item,
164 btrfs_item_ptr_offset(buf, nritems),
165 sizeof(root_item));
166 nritems++;
167
168
169 csum_tree_block(NULL, buf, 0);
170 ret = pwrite(fd, buf->data, leafsize, blocks[1]);
171 BUG_ON(ret != leafsize);
172
173 /* create the items for the extent tree */
174 nritems = 0;
175 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
176 sizeof(struct btrfs_extent_item);
177 btrfs_set_disk_key_objectid(&disk_key, 0);
178 btrfs_set_disk_key_offset(&disk_key, first_free);
179 btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
180 btrfs_set_item_key(buf, &disk_key, nritems);
181 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
182 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
183 sizeof(struct btrfs_extent_item));
184 extent_item = btrfs_item_ptr(buf, nritems, struct btrfs_extent_item);
185 btrfs_set_extent_refs(buf, extent_item, 1);
186 nritems++;
187 for (i = 1; i < 6; i++) {
188 BUG_ON(blocks[i] < first_free);
189 BUG_ON(blocks[i] < blocks[i - 1]);
190
191 /* create extent item */
192 itemoff = itemoff - sizeof(struct btrfs_extent_item);
193 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
194 btrfs_set_disk_key_offset(&disk_key, leafsize);
195 btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
196 btrfs_set_item_key(buf, &disk_key, nritems);
197 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
198 itemoff);
199 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
200 sizeof(struct btrfs_extent_item));
201 extent_item = btrfs_item_ptr(buf, nritems,
202 struct btrfs_extent_item);
203 btrfs_set_extent_refs(buf, extent_item, 1);
204 nritems++;
205
206 /* create extent ref */
207 ref_root = reference_root_table[i];
208 if (ref_root == BTRFS_FS_TREE_OBJECTID)
209 ref_gen = 1;
210 else
211 ref_gen = 0;
212
213 hash = btrfs_hash_extent_ref(ref_root, ref_gen, 0, 0);
214 itemoff = itemoff - sizeof(struct btrfs_extent_ref);
215 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
216 btrfs_set_disk_key_offset(&disk_key, hash);
217 btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_REF_KEY);
218 btrfs_set_item_key(buf, &disk_key, nritems);
219 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
220 itemoff);
221 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
222 sizeof(struct btrfs_extent_ref));
223 extent_ref = btrfs_item_ptr(buf, nritems,
224 struct btrfs_extent_ref);
225 btrfs_set_ref_root(buf, extent_ref, ref_root);
226 btrfs_set_ref_generation(buf, extent_ref, ref_gen);
227 btrfs_set_ref_objectid(buf, extent_ref, 0);
228 btrfs_set_ref_offset(buf, extent_ref, 0);
229 nritems++;
230 }
231 btrfs_set_header_bytenr(buf, blocks[2]);
232 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
233 btrfs_set_header_nritems(buf, nritems);
234 csum_tree_block(NULL, buf, 0);
235 ret = pwrite(fd, buf->data, leafsize, blocks[2]);
236 BUG_ON(ret != leafsize);
237
238 /* create the chunk tree */
239 nritems = 0;
240 item_size = btrfs_chunk_item_size(1);
241 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
242
243 /* first we have chunk 0 */
244 btrfs_set_disk_key_objectid(&disk_key, 0);
245 btrfs_set_disk_key_offset(&disk_key, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
246 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
247 btrfs_set_item_key(buf, &disk_key, nritems);
248 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
249 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
250
251 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
252 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
253 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
254 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
255 btrfs_set_chunk_io_align(buf, chunk, sectorsize);
256 btrfs_set_chunk_io_width(buf, chunk, sectorsize);
257 btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
258 btrfs_set_chunk_num_stripes(buf, chunk, 1);
259 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
260 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
261
262 /* copy the key for the chunk to the system array */
263 ptr = super.sys_chunk_array;
264 array_size = sizeof(disk_key);
265
266 memcpy(ptr, &disk_key, sizeof(disk_key));
267 ptr += sizeof(disk_key);
268
269 /* copy the chunk to the system array */
270 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
271 array_size += item_size;
272 ptr += item_size;
273 btrfs_set_super_sys_array_size(&super, array_size);
274
275 /* then device 1 (there is no device 0) */
276 nritems++;
277 item_size = sizeof(*dev_item);
278 itemoff = itemoff - item_size;
279 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
280 btrfs_set_disk_key_offset(&disk_key, 1);
281 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
282 btrfs_set_item_key(buf, &disk_key, nritems);
283 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
284 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
285
286 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
287 btrfs_set_device_id(buf, dev_item, 1);
288 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
289 btrfs_set_device_bytes_used(buf, dev_item,
290 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
291 btrfs_set_device_io_align(buf, dev_item, sectorsize);
292 btrfs_set_device_io_width(buf, dev_item, sectorsize);
293 btrfs_set_device_sector_size(buf, dev_item, sectorsize);
294 btrfs_set_device_type(buf, dev_item, 0);
295 nritems++;
296
297 uuid_generate(super.dev_item.uuid);
298
299 write_extent_buffer(buf, super.dev_item.uuid,
300 (unsigned long)btrfs_device_uuid(dev_item),
301 BTRFS_DEV_UUID_SIZE);
302 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
303 sizeof(*dev_item));
304
305 btrfs_set_header_bytenr(buf, blocks[3]);
306 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
307 btrfs_set_header_nritems(buf, nritems);
308 csum_tree_block(NULL, buf, 0);
309 ret = pwrite(fd, buf->data, leafsize, blocks[3]);
310
311 /* create the device tree */
312 nritems = 0;
313 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
314 sizeof(struct btrfs_dev_extent);
315
316 btrfs_set_disk_key_objectid(&disk_key, 1);
317 btrfs_set_disk_key_offset(&disk_key, 0);
318 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
319 btrfs_set_item_key(buf, &disk_key, nritems);
320 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
321 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
322 sizeof(struct btrfs_dev_extent));
323 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
324 btrfs_set_dev_extent_owner(buf, dev_extent, 0);
325 btrfs_set_dev_extent_length(buf, dev_extent,
326 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
327 nritems++;
328
329 btrfs_set_header_bytenr(buf, blocks[4]);
330 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
331 btrfs_set_header_nritems(buf, nritems);
332 csum_tree_block(NULL, buf, 0);
333 ret = pwrite(fd, buf->data, leafsize, blocks[4]);
334
335 /* finally create the FS root */
336 btrfs_set_header_bytenr(buf, blocks[5]);
337 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
338 btrfs_set_header_nritems(buf, 0);
339 csum_tree_block(NULL, buf, 0);
340 ret = pwrite(fd, buf->data, leafsize, blocks[5]);
341 BUG_ON(ret != leafsize);
342
343 /* and write out the super block */
344 BUG_ON(sizeof(super) > sectorsize);
345 memset(buf->data, 0, sectorsize);
346 memcpy(buf->data, &super, sizeof(super));
347 buf->len = sectorsize;
348 csum_tree_block(NULL, buf, 0);
349 ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
350 BUG_ON(ret != sectorsize);
351
352
353 free(buf);
354 return 0;
355 }
356
357 static u64 device_size(int fd, struct stat *st)
358 {
359 u64 size;
360 if (S_ISREG(st->st_mode)) {
361 return st->st_size;
362 }
363 if (!S_ISBLK(st->st_mode)) {
364 return 0;
365 }
366 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
367 return size;
368 }
369 return 0;
370 }
371
372 static int zero_blocks(int fd, off_t start, size_t len)
373 {
374 char *buf = malloc(len);
375 int ret = 0;
376 ssize_t written;
377
378 if (!buf)
379 return -ENOMEM;
380 memset(buf, 0, len);
381 written = pwrite(fd, buf, len, start);
382 if (written != len)
383 ret = -EIO;
384 free(buf);
385 return ret;
386 }
387
388 static int zero_dev_start(int fd)
389 {
390 off_t start = 0;
391 size_t len = 2 * 1024 * 1024;
392
393 #ifdef __sparc__
394 /* don't overwrite the disk labels on sparc */
395 start = 1024;
396 len -= 1024;
397 #endif
398 return zero_blocks(fd, start, len);
399 }
400
401 static int zero_dev_end(int fd, u64 dev_size)
402 {
403 size_t len = 2 * 1024 * 1024;
404 off_t start = dev_size - len;
405
406 return zero_blocks(fd, start, len);
407 }
408
409 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
410 struct btrfs_root *root, int fd, u64 block_count,
411 u32 io_width, u32 io_align, u32 sectorsize)
412 {
413 struct btrfs_super_block *disk_super;
414 struct btrfs_super_block *super = &root->fs_info->super_copy;
415 struct btrfs_device *device;
416 struct btrfs_dev_item *dev_item;
417 char *buf;
418 u64 total_bytes;
419 u64 num_devs;
420 int ret;
421
422 device = kmalloc(sizeof(*device), GFP_NOFS);
423 if (!device)
424 return -ENOMEM;
425 buf = kmalloc(sectorsize, GFP_NOFS);
426 if (!buf) {
427 kfree(device);
428 return -ENOMEM;
429 }
430 BUG_ON(sizeof(*disk_super) > sectorsize);
431 memset(buf, 0, sectorsize);
432
433 disk_super = (struct btrfs_super_block *)buf;
434 dev_item = &disk_super->dev_item;
435
436 uuid_generate(device->uuid);
437 device->devid = 0;
438 device->type = 0;
439 device->io_width = io_width;
440 device->io_align = io_align;
441 device->sector_size = sectorsize;
442 device->fd = fd;
443 device->total_bytes = block_count;
444 device->bytes_used = 0;
445 device->total_ios = 0;
446 device->dev_root = root->fs_info->dev_root;
447
448 ret = btrfs_add_device(trans, root, device);
449 BUG_ON(ret);
450
451 total_bytes = btrfs_super_total_bytes(super) + block_count;
452 btrfs_set_super_total_bytes(super, total_bytes);
453
454 num_devs = btrfs_super_num_devices(super) + 1;
455 btrfs_set_super_num_devices(super, num_devs);
456
457 memcpy(disk_super, super, sizeof(*disk_super));
458
459 printf("adding device id %llu\n", (unsigned long long)device->devid);
460 btrfs_set_stack_device_id(dev_item, device->devid);
461 btrfs_set_stack_device_type(dev_item, device->type);
462 btrfs_set_stack_device_io_align(dev_item, device->io_align);
463 btrfs_set_stack_device_io_width(dev_item, device->io_width);
464 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
465 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
466 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
467 memcpy(&dev_item->uuid, device->uuid, BTRFS_DEV_UUID_SIZE);
468
469 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
470 BUG_ON(ret != sectorsize);
471
472 kfree(buf);
473 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
474 ret = btrfs_bootstrap_super_map(&root->fs_info->mapping_tree,
475 root->fs_info->fs_devices);
476 BUG_ON(ret);
477 return 0;
478 }
479
480 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret)
481 {
482 u64 block_count;
483 struct stat st;
484 int ret;
485
486 ret = fstat(fd, &st);
487 if (ret < 0) {
488 fprintf(stderr, "unable to stat %s\n", file);
489 exit(1);
490 }
491
492 block_count = device_size(fd, &st);
493 if (block_count == 0) {
494 fprintf(stderr, "unable to find %s size\n", file);
495 exit(1);
496 }
497 zero_end = 1;
498
499 if (block_count < 256 * 1024 * 1024) {
500 fprintf(stderr, "device %s is too small\n", file);
501 exit(1);
502 }
503 ret = zero_dev_start(fd);
504 if (ret) {
505 fprintf(stderr, "failed to zero device start %d\n", ret);
506 exit(1);
507 }
508
509 if (zero_end) {
510 ret = zero_dev_end(fd, block_count);
511 if (ret) {
512 fprintf(stderr, "failed to zero device end %d\n", ret);
513 exit(1);
514 }
515 }
516 *block_count_ret = block_count;
517 return 0;
518 }
519
520 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
521 struct btrfs_root *root, u64 objectid)
522 {
523 int ret;
524 struct btrfs_inode_item inode_item;
525
526 memset(&inode_item, 0, sizeof(inode_item));
527 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
528 btrfs_set_stack_inode_size(&inode_item, 0);
529 btrfs_set_stack_inode_nlink(&inode_item, 1);
530 btrfs_set_stack_inode_nblocks(&inode_item, 1);
531 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0555);
532
533 if (root->fs_info->tree_root == root)
534 btrfs_set_super_root_dir(&root->fs_info->super_copy, objectid);
535
536 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
537 if (ret)
538 goto error;
539
540 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid);
541 if (ret)
542 goto error;
543
544 btrfs_set_root_dirid(&root->root_item, objectid);
545 ret = 0;
546 error:
547 return ret;
548 }
549
550 /*
551 * returns 1 if the device was mounted, < 0 on error or 0 if everything
552 * is safe to continue. TODO, this should also scan multi-device filesystems
553 */
554 int check_mounted(char *file)
555 {
556 struct mntent *mnt;
557 struct stat st_buf;
558 dev_t file_dev = 0;
559 dev_t file_rdev = 0;
560 ino_t file_ino = 0;
561 FILE *f;
562 int ret = 0;
563
564 if ((f = setmntent ("/proc/mounts", "r")) == NULL)
565 return -errno;
566
567 if (stat(file, &st_buf) < 0) {
568 return -errno;
569 } else {
570 if (S_ISBLK(st_buf.st_mode)) {
571 file_rdev = st_buf.st_rdev;
572 } else {
573 file_dev = st_buf.st_dev;
574 file_ino = st_buf.st_ino;
575 }
576 }
577
578 while ((mnt = getmntent (f)) != NULL) {
579 if (strcmp(file, mnt->mnt_fsname) == 0)
580 break;
581
582 if (stat(mnt->mnt_fsname, &st_buf) == 0) {
583 if (S_ISBLK(st_buf.st_mode)) {
584 if (file_rdev && (file_rdev == st_buf.st_rdev))
585 break;
586 } else if (file_dev && ((file_dev == st_buf.st_dev) &&
587 (file_ino == st_buf.st_ino))) {
588 break;
589 }
590 }
591 }
592
593 if (mnt) {
594 /* found an entry in mnt table */
595 ret = 1;
596 }
597
598 endmntent (f);
599 return ret;
600 }
601
602 struct pending_dir {
603 struct list_head list;
604 char name[256];
605 };
606
607 int btrfs_register_one_device(char *fname)
608 {
609 struct btrfs_ioctl_vol_args args;
610 int fd;
611 int ret;
612
613 fd = open("/dev/btrfs-control", O_RDONLY);
614 if (fd < 0)
615 return -EINVAL;
616 strcpy(args.name, fname);
617 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
618 close(fd);
619 return ret;
620 }
621
622 int btrfs_scan_one_dir(char *dirname, int run_ioctl)
623 {
624 DIR *dirp;
625 struct dirent *dirent;
626 struct pending_dir *pending;
627 struct stat st;
628 int ret;
629 int fd;
630 int dirname_len;
631 int pathlen;
632 char *fullpath;
633 struct list_head pending_list;
634 struct btrfs_fs_devices *tmp_devices;
635 u64 num_devices;
636
637 INIT_LIST_HEAD(&pending_list);
638
639 pending = malloc(sizeof(*pending));
640 if (!pending)
641 return -ENOMEM;
642 strcpy(pending->name, dirname);
643
644 again:
645 dirname_len = strlen(pending->name);
646 pathlen = 1024;
647 fullpath = malloc(pathlen);
648 dirname = pending->name;
649
650 if (!fullpath) {
651 ret = -ENOMEM;
652 goto fail;
653 }
654 dirp = opendir(dirname);
655 if (!dirp) {
656 fprintf(stderr, "Unable to open /sys/block for scanning\n");
657 return -ENOENT;
658 }
659 while(1) {
660 dirent = readdir(dirp);
661 if (!dirent)
662 break;
663 if (dirent->d_name[0] == '.')
664 continue;
665 if (dirname_len + strlen(dirent->d_name) + 2 > pathlen) {
666 ret = -EFAULT;
667 goto fail;
668 }
669 snprintf(fullpath, pathlen, "%s/%s", dirname, dirent->d_name);
670 ret = lstat(fullpath, &st);
671 if (ret < 0) {
672 fprintf(stderr, "failed to stat %s\n", fullpath);
673 continue;
674 }
675 if (S_ISLNK(st.st_mode))
676 continue;
677 if (S_ISDIR(st.st_mode)) {
678 struct pending_dir *next = malloc(sizeof(*next));
679 if (!next) {
680 ret = -ENOMEM;
681 goto fail;
682 }
683 strcpy(next->name, fullpath);
684 list_add_tail(&next->list, &pending_list);
685 }
686 if (!S_ISBLK(st.st_mode)) {
687 continue;
688 }
689 fd = open(fullpath, O_RDONLY);
690 if (fd < 0) {
691 fprintf(stderr, "failed to read %s\n", fullpath);
692 continue;
693 }
694 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
695 &num_devices,
696 BTRFS_SUPER_INFO_OFFSET);
697 if (ret == 0 && run_ioctl > 0) {
698 btrfs_register_one_device(fullpath);
699 }
700 close(fd);
701 }
702 if (!list_empty(&pending_list)) {
703 free(pending);
704 pending = list_entry(pending_list.next, struct pending_dir,
705 list);
706 list_del(&pending->list);
707 closedir(dirp);
708 goto again;
709 }
710 ret = 0;
711 fail:
712 free(pending);
713 closedir(dirp);
714 return ret;
715 }
716
717 int btrfs_scan_for_fsid(struct btrfs_fs_devices *fs_devices, u64 total_devs,
718 int run_ioctls)
719 {
720 return btrfs_scan_one_dir("/dev", run_ioctls);
721 }
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