2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #define _XOPEN_SOURCE 600
24 #include <sys/ioctl.h>
25 #include <sys/mount.h>
27 #include <sys/types.h>
29 #include <uuid/uuid.h>
35 #include <linux/loop.h>
36 #include <linux/major.h>
37 #include <linux/kdev_t.h>
39 #include "kerncompat.h"
40 #include "radix-tree.h"
43 #include "transaction.h"
50 #define BLKGETSIZE64 0
51 static inline int ioctl(int fd, int define, u64 *size) { return 0; }
55 #define BLKDISCARD _IO(0x12,119)
59 discard_blocks(int fd, u64 start, u64 len)
61 u64 range[2] = { start, len };
63 if (ioctl(fd, BLKDISCARD, &range) < 0)
68 static u64 reference_root_table[] = {
69 [1] = BTRFS_ROOT_TREE_OBJECTID,
70 [2] = BTRFS_EXTENT_TREE_OBJECTID,
71 [3] = BTRFS_CHUNK_TREE_OBJECTID,
72 [4] = BTRFS_DEV_TREE_OBJECTID,
73 [5] = BTRFS_FS_TREE_OBJECTID,
74 [6] = BTRFS_CSUM_TREE_OBJECTID,
77 int make_btrfs(int fd, const char *device, const char *label,
78 u64 blocks[7], u64 num_bytes, u32 nodesize,
79 u32 leafsize, u32 sectorsize, u32 stripesize)
81 struct btrfs_super_block super;
82 struct extent_buffer *buf;
83 struct btrfs_root_item root_item;
84 struct btrfs_disk_key disk_key;
85 struct btrfs_extent_item *extent_item;
86 struct btrfs_inode_item *inode_item;
87 struct btrfs_chunk *chunk;
88 struct btrfs_dev_item *dev_item;
89 struct btrfs_dev_extent *dev_extent;
90 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
101 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
102 first_free &= ~((u64)sectorsize - 1);
104 memset(&super, 0, sizeof(super));
106 num_bytes = (num_bytes / sectorsize) * sectorsize;
107 uuid_generate(super.fsid);
108 uuid_generate(super.dev_item.uuid);
109 uuid_generate(chunk_tree_uuid);
111 btrfs_set_super_bytenr(&super, blocks[0]);
112 btrfs_set_super_num_devices(&super, 1);
113 strncpy((char *)&super.magic, BTRFS_MAGIC, sizeof(super.magic));
114 btrfs_set_super_generation(&super, 1);
115 btrfs_set_super_root(&super, blocks[1]);
116 btrfs_set_super_chunk_root(&super, blocks[3]);
117 btrfs_set_super_total_bytes(&super, num_bytes);
118 btrfs_set_super_bytes_used(&super, 6 * leafsize);
119 btrfs_set_super_sectorsize(&super, sectorsize);
120 btrfs_set_super_leafsize(&super, leafsize);
121 btrfs_set_super_nodesize(&super, nodesize);
122 btrfs_set_super_stripesize(&super, stripesize);
123 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
124 btrfs_set_super_chunk_root_generation(&super, 1);
125 btrfs_set_super_cache_generation(&super, -1);
127 strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
129 buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
131 /* create the tree of root objects */
132 memset(buf->data, 0, leafsize);
134 btrfs_set_header_bytenr(buf, blocks[1]);
135 btrfs_set_header_nritems(buf, 4);
136 btrfs_set_header_generation(buf, 1);
137 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
138 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
139 write_extent_buffer(buf, super.fsid, (unsigned long)
140 btrfs_header_fsid(buf), BTRFS_FSID_SIZE);
142 write_extent_buffer(buf, chunk_tree_uuid, (unsigned long)
143 btrfs_header_chunk_tree_uuid(buf),
146 /* create the items for the root tree */
147 memset(&root_item, 0, sizeof(root_item));
148 inode_item = &root_item.inode;
149 btrfs_set_stack_inode_generation(inode_item, 1);
150 btrfs_set_stack_inode_size(inode_item, 3);
151 btrfs_set_stack_inode_nlink(inode_item, 1);
152 btrfs_set_stack_inode_nbytes(inode_item, leafsize);
153 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
154 btrfs_set_root_refs(&root_item, 1);
155 btrfs_set_root_used(&root_item, leafsize);
156 btrfs_set_root_generation(&root_item, 1);
158 memset(&disk_key, 0, sizeof(disk_key));
159 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
160 btrfs_set_disk_key_offset(&disk_key, 0);
163 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
164 btrfs_set_root_bytenr(&root_item, blocks[2]);
165 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
166 btrfs_set_item_key(buf, &disk_key, nritems);
167 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
168 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
170 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
171 nritems), sizeof(root_item));
174 itemoff = itemoff - sizeof(root_item);
175 btrfs_set_root_bytenr(&root_item, blocks[4]);
176 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
177 btrfs_set_item_key(buf, &disk_key, nritems);
178 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
179 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
181 write_extent_buffer(buf, &root_item,
182 btrfs_item_ptr_offset(buf, nritems),
186 itemoff = itemoff - sizeof(root_item);
187 btrfs_set_root_bytenr(&root_item, blocks[5]);
188 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
189 btrfs_set_item_key(buf, &disk_key, nritems);
190 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
191 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
193 write_extent_buffer(buf, &root_item,
194 btrfs_item_ptr_offset(buf, nritems),
198 itemoff = itemoff - sizeof(root_item);
199 btrfs_set_root_bytenr(&root_item, blocks[6]);
200 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
201 btrfs_set_item_key(buf, &disk_key, nritems);
202 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
203 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
205 write_extent_buffer(buf, &root_item,
206 btrfs_item_ptr_offset(buf, nritems),
211 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
212 ret = pwrite(fd, buf->data, leafsize, blocks[1]);
213 BUG_ON(ret != leafsize);
215 /* create the items for the extent tree */
216 memset(buf->data+sizeof(struct btrfs_header), 0,
217 leafsize-sizeof(struct btrfs_header));
219 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
220 for (i = 1; i < 7; i++) {
221 BUG_ON(blocks[i] < first_free);
222 BUG_ON(blocks[i] < blocks[i - 1]);
224 /* create extent item */
225 itemoff -= sizeof(struct btrfs_extent_item) +
226 sizeof(struct btrfs_tree_block_info);
227 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
228 btrfs_set_disk_key_offset(&disk_key, leafsize);
229 btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
230 btrfs_set_item_key(buf, &disk_key, nritems);
231 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
233 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
234 sizeof(struct btrfs_extent_item) +
235 sizeof(struct btrfs_tree_block_info));
236 extent_item = btrfs_item_ptr(buf, nritems,
237 struct btrfs_extent_item);
238 btrfs_set_extent_refs(buf, extent_item, 1);
239 btrfs_set_extent_generation(buf, extent_item, 1);
240 btrfs_set_extent_flags(buf, extent_item,
241 BTRFS_EXTENT_FLAG_TREE_BLOCK);
244 /* create extent ref */
245 ref_root = reference_root_table[i];
246 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
247 btrfs_set_disk_key_offset(&disk_key, ref_root);
248 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
249 btrfs_set_item_key(buf, &disk_key, nritems);
250 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
252 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), 0);
255 btrfs_set_header_bytenr(buf, blocks[2]);
256 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
257 btrfs_set_header_nritems(buf, nritems);
258 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
259 ret = pwrite(fd, buf->data, leafsize, blocks[2]);
260 BUG_ON(ret != leafsize);
262 /* create the chunk tree */
263 memset(buf->data+sizeof(struct btrfs_header), 0,
264 leafsize-sizeof(struct btrfs_header));
266 item_size = sizeof(*dev_item);
267 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
269 /* first device 1 (there is no device 0) */
270 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
271 btrfs_set_disk_key_offset(&disk_key, 1);
272 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
273 btrfs_set_item_key(buf, &disk_key, nritems);
274 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
275 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
277 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
278 btrfs_set_device_id(buf, dev_item, 1);
279 btrfs_set_device_generation(buf, dev_item, 0);
280 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
281 btrfs_set_device_bytes_used(buf, dev_item,
282 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
283 btrfs_set_device_io_align(buf, dev_item, sectorsize);
284 btrfs_set_device_io_width(buf, dev_item, sectorsize);
285 btrfs_set_device_sector_size(buf, dev_item, sectorsize);
286 btrfs_set_device_type(buf, dev_item, 0);
288 write_extent_buffer(buf, super.dev_item.uuid,
289 (unsigned long)btrfs_device_uuid(dev_item),
291 write_extent_buffer(buf, super.fsid,
292 (unsigned long)btrfs_device_fsid(dev_item),
294 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
298 item_size = btrfs_chunk_item_size(1);
299 itemoff = itemoff - item_size;
301 /* then we have chunk 0 */
302 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
303 btrfs_set_disk_key_offset(&disk_key, 0);
304 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
305 btrfs_set_item_key(buf, &disk_key, nritems);
306 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
307 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
309 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
310 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
311 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
312 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
313 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
314 btrfs_set_chunk_io_align(buf, chunk, sectorsize);
315 btrfs_set_chunk_io_width(buf, chunk, sectorsize);
316 btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
317 btrfs_set_chunk_num_stripes(buf, chunk, 1);
318 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
319 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
322 write_extent_buffer(buf, super.dev_item.uuid,
323 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
326 /* copy the key for the chunk to the system array */
327 ptr = super.sys_chunk_array;
328 array_size = sizeof(disk_key);
330 memcpy(ptr, &disk_key, sizeof(disk_key));
331 ptr += sizeof(disk_key);
333 /* copy the chunk to the system array */
334 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
335 array_size += item_size;
337 btrfs_set_super_sys_array_size(&super, array_size);
339 btrfs_set_header_bytenr(buf, blocks[3]);
340 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
341 btrfs_set_header_nritems(buf, nritems);
342 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
343 ret = pwrite(fd, buf->data, leafsize, blocks[3]);
345 /* create the device tree */
346 memset(buf->data+sizeof(struct btrfs_header), 0,
347 leafsize-sizeof(struct btrfs_header));
349 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
350 sizeof(struct btrfs_dev_extent);
352 btrfs_set_disk_key_objectid(&disk_key, 1);
353 btrfs_set_disk_key_offset(&disk_key, 0);
354 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
355 btrfs_set_item_key(buf, &disk_key, nritems);
356 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
357 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
358 sizeof(struct btrfs_dev_extent));
359 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
360 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
361 BTRFS_CHUNK_TREE_OBJECTID);
362 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
363 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
364 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
366 write_extent_buffer(buf, chunk_tree_uuid,
367 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
370 btrfs_set_dev_extent_length(buf, dev_extent,
371 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
374 btrfs_set_header_bytenr(buf, blocks[4]);
375 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
376 btrfs_set_header_nritems(buf, nritems);
377 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
378 ret = pwrite(fd, buf->data, leafsize, blocks[4]);
380 /* create the FS root */
381 memset(buf->data+sizeof(struct btrfs_header), 0,
382 leafsize-sizeof(struct btrfs_header));
383 btrfs_set_header_bytenr(buf, blocks[5]);
384 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
385 btrfs_set_header_nritems(buf, 0);
386 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
387 ret = pwrite(fd, buf->data, leafsize, blocks[5]);
388 BUG_ON(ret != leafsize);
390 /* finally create the csum root */
391 memset(buf->data+sizeof(struct btrfs_header), 0,
392 leafsize-sizeof(struct btrfs_header));
393 btrfs_set_header_bytenr(buf, blocks[6]);
394 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
395 btrfs_set_header_nritems(buf, 0);
396 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
397 ret = pwrite(fd, buf->data, leafsize, blocks[6]);
398 BUG_ON(ret != leafsize);
400 /* and write out the super block */
401 BUG_ON(sizeof(super) > sectorsize);
402 memset(buf->data, 0, sectorsize);
403 memcpy(buf->data, &super, sizeof(super));
404 buf->len = sectorsize;
405 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
406 ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
407 BUG_ON(ret != sectorsize);
414 static u64 device_size(int fd, struct stat *st)
417 if (S_ISREG(st->st_mode)) {
420 if (!S_ISBLK(st->st_mode)) {
423 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
429 static int zero_blocks(int fd, off_t start, size_t len)
431 char *buf = malloc(len);
438 written = pwrite(fd, buf, len, start);
445 static int zero_dev_start(int fd)
448 size_t len = 2 * 1024 * 1024;
451 /* don't overwrite the disk labels on sparc */
455 return zero_blocks(fd, start, len);
458 static int zero_dev_end(int fd, u64 dev_size)
460 size_t len = 2 * 1024 * 1024;
461 off_t start = dev_size - len;
463 return zero_blocks(fd, start, len);
466 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
467 struct btrfs_root *root, int fd, char *path,
468 u64 block_count, u32 io_width, u32 io_align,
471 struct btrfs_super_block *disk_super;
472 struct btrfs_super_block *super = &root->fs_info->super_copy;
473 struct btrfs_device *device;
474 struct btrfs_dev_item *dev_item;
480 device = kmalloc(sizeof(*device), GFP_NOFS);
483 buf = kmalloc(sectorsize, GFP_NOFS);
488 BUG_ON(sizeof(*disk_super) > sectorsize);
489 memset(buf, 0, sectorsize);
491 disk_super = (struct btrfs_super_block *)buf;
492 dev_item = &disk_super->dev_item;
494 uuid_generate(device->uuid);
497 device->io_width = io_width;
498 device->io_align = io_align;
499 device->sector_size = sectorsize;
501 device->writeable = 1;
502 device->total_bytes = block_count;
503 device->bytes_used = 0;
504 device->total_ios = 0;
505 device->dev_root = root->fs_info->dev_root;
507 ret = btrfs_add_device(trans, root, device);
510 total_bytes = btrfs_super_total_bytes(super) + block_count;
511 btrfs_set_super_total_bytes(super, total_bytes);
513 num_devs = btrfs_super_num_devices(super) + 1;
514 btrfs_set_super_num_devices(super, num_devs);
516 memcpy(disk_super, super, sizeof(*disk_super));
518 printf("adding device %s id %llu\n", path,
519 (unsigned long long)device->devid);
521 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
522 btrfs_set_stack_device_id(dev_item, device->devid);
523 btrfs_set_stack_device_type(dev_item, device->type);
524 btrfs_set_stack_device_io_align(dev_item, device->io_align);
525 btrfs_set_stack_device_io_width(dev_item, device->io_width);
526 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
527 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
528 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
529 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
531 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
532 BUG_ON(ret != sectorsize);
535 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
536 device->fs_devices = root->fs_info->fs_devices;
540 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
541 u64 max_block_count, int *mixed, int nodiscard)
548 ret = fstat(fd, &st);
550 fprintf(stderr, "unable to stat %s\n", file);
554 block_count = device_size(fd, &st);
555 if (block_count == 0) {
556 fprintf(stderr, "unable to find %s size\n", file);
560 block_count = min(block_count, max_block_count);
563 if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
564 printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
570 * We intentionally ignore errors from the discard ioctl. It is
571 * not necessary for the mkfs functionality but just an optimization.
573 discard_blocks(fd, 0, block_count);
576 ret = zero_dev_start(fd);
578 fprintf(stderr, "failed to zero device start %d\n", ret);
582 for (i = 0 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
583 bytenr = btrfs_sb_offset(i);
584 if (bytenr >= block_count)
586 zero_blocks(fd, bytenr, BTRFS_SUPER_INFO_SIZE);
590 ret = zero_dev_end(fd, block_count);
592 fprintf(stderr, "failed to zero device end %d\n", ret);
596 *block_count_ret = block_count;
600 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
601 struct btrfs_root *root, u64 objectid)
604 struct btrfs_inode_item inode_item;
605 time_t now = time(NULL);
607 memset(&inode_item, 0, sizeof(inode_item));
608 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
609 btrfs_set_stack_inode_size(&inode_item, 0);
610 btrfs_set_stack_inode_nlink(&inode_item, 1);
611 btrfs_set_stack_inode_nbytes(&inode_item, root->leafsize);
612 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
613 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
614 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
615 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
616 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
617 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
618 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
619 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
620 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
622 if (root->fs_info->tree_root == root)
623 btrfs_set_super_root_dir(&root->fs_info->super_copy, objectid);
625 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
629 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
633 btrfs_set_root_dirid(&root->root_item, objectid);
639 /* checks if a device is a loop device */
640 int is_loop_device (const char* device) {
643 if(stat(device, &statbuf) < 0)
646 return (S_ISBLK(statbuf.st_mode) &&
647 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
651 /* Takes a loop device path (e.g. /dev/loop0) and returns
652 * the associated file (e.g. /images/my_btrfs.img) */
653 int resolve_loop_device(const char* loop_dev, char* loop_file, int max_len)
657 struct loop_info loopinfo;
659 if ((loop_fd = open(loop_dev, O_RDONLY)) < 0)
662 ret_ioctl = ioctl(loop_fd, LOOP_GET_STATUS, &loopinfo);
665 if (ret_ioctl == 0) {
666 strncpy(loop_file, loopinfo.lo_name, max_len);
668 loop_file[max_len-1] = 0;
675 /* Checks whether a and b are identical or device
676 * files associated with the same block device
678 int is_same_blk_file(const char* a, const char* b)
680 struct stat st_buf_a, st_buf_b;
681 char real_a[PATH_MAX];
682 char real_b[PATH_MAX];
684 if(!realpath(a, real_a) ||
685 !realpath(b, real_b))
690 /* Identical path? */
691 if(strcmp(real_a, real_b) == 0)
694 if(stat(a, &st_buf_a) < 0 ||
695 stat(b, &st_buf_b) < 0)
702 /* Same blockdevice? */
703 if(S_ISBLK(st_buf_a.st_mode) &&
704 S_ISBLK(st_buf_b.st_mode) &&
705 st_buf_a.st_rdev == st_buf_b.st_rdev)
711 if (st_buf_a.st_dev == st_buf_b.st_dev &&
712 st_buf_a.st_ino == st_buf_b.st_ino)
720 /* checks if a and b are identical or device
721 * files associated with the same block device or
722 * if one file is a loop device that uses the other
725 int is_same_loop_file(const char* a, const char* b)
727 char res_a[PATH_MAX];
728 char res_b[PATH_MAX];
733 /* Resolve a if it is a loop device */
734 if((ret = is_loop_device(a)) < 0) {
739 if ((ret = resolve_loop_device(a, res_a, sizeof(res_a))) < 0)
747 /* Resolve b if it is a loop device */
748 if ((ret = is_loop_device(b)) < 0) {
753 if((ret = resolve_loop_device(b, res_b, sizeof(res_b))) < 0)
761 return is_same_blk_file(final_a, final_b);
764 /* Checks if a file exists and is a block or regular file*/
765 int is_existing_blk_or_reg_file(const char* filename)
769 if(stat(filename, &st_buf) < 0) {
776 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
779 /* Checks if a file is used (directly or indirectly via a loop device)
780 * by a device in fs_devices
782 int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices, const char* file)
785 struct list_head *head;
786 struct list_head *cur;
787 struct btrfs_device *device;
789 head = &fs_devices->devices;
790 list_for_each(cur, head) {
791 device = list_entry(cur, struct btrfs_device, dev_list);
793 if((ret = is_same_loop_file(device->name, file)))
801 * returns 1 if the device was mounted, < 0 on error or 0 if everything
802 * is safe to continue.
804 int check_mounted(const char* file)
809 fd = open(file, O_RDONLY);
811 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
815 ret = check_mounted_where(fd, file, NULL, 0, NULL);
821 int check_mounted_where(int fd, const char *file, char *where, int size,
822 struct btrfs_fs_devices **fs_dev_ret)
827 struct btrfs_fs_devices *fs_devices_mnt = NULL;
831 /* scan the initial device */
832 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
833 &total_devs, BTRFS_SUPER_INFO_OFFSET);
834 is_btrfs = (ret >= 0);
836 /* scan other devices */
837 if (is_btrfs && total_devs > 1) {
838 if((ret = btrfs_scan_for_fsid(fs_devices_mnt, total_devs, 1)))
842 /* iterate over the list of currently mountes filesystems */
843 if ((f = setmntent ("/proc/mounts", "r")) == NULL)
846 while ((mnt = getmntent (f)) != NULL) {
848 if(strcmp(mnt->mnt_type, "btrfs") != 0)
851 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
853 /* ignore entries in the mount table that are not
854 associated with a file*/
855 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
856 goto out_mntloop_err;
860 ret = is_same_loop_file(file, mnt->mnt_fsname);
864 goto out_mntloop_err;
869 /* Did we find an entry in mnt table? */
870 if (mnt && size && where) {
871 strncpy(where, mnt->mnt_dir, size);
875 *fs_dev_ret = fs_devices_mnt;
885 /* Gets the mount point of btrfs filesystem that is using the specified device.
886 * Returns 0 is everything is good, <0 if we have an error.
887 * TODO: Fix this fucntion and check_mounted to work with multiple drive BTRFS
890 int get_mountpt(char *dev, char *mntpt, size_t size)
896 f = setmntent("/proc/mounts", "r");
900 while ((mnt = getmntent(f)) != NULL )
902 if (strcmp(dev, mnt->mnt_fsname) == 0)
904 strncpy(mntpt, mnt->mnt_dir, size);
913 /* We didn't find an entry so lets report an error */
921 struct list_head list;
925 void btrfs_register_one_device(char *fname)
927 struct btrfs_ioctl_vol_args args;
932 fd = open("/dev/btrfs-control", O_RDONLY);
934 fprintf(stderr, "failed to open /dev/btrfs-control "
935 "skipping device registration\n");
938 strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
939 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
940 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
943 fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
949 int btrfs_scan_one_dir(char *dirname, int run_ioctl)
952 struct dirent *dirent;
953 struct pending_dir *pending;
960 struct list_head pending_list;
961 struct btrfs_fs_devices *tmp_devices;
964 INIT_LIST_HEAD(&pending_list);
966 pending = malloc(sizeof(*pending));
969 strcpy(pending->name, dirname);
972 dirname_len = strlen(pending->name);
974 fullpath = malloc(pathlen);
975 dirname = pending->name;
981 dirp = opendir(dirname);
983 fprintf(stderr, "Unable to open %s for scanning\n", dirname);
988 dirent = readdir(dirp);
991 if (dirent->d_name[0] == '.')
993 if (dirname_len + strlen(dirent->d_name) + 2 > pathlen) {
997 snprintf(fullpath, pathlen, "%s/%s", dirname, dirent->d_name);
998 ret = lstat(fullpath, &st);
1000 fprintf(stderr, "failed to stat %s\n", fullpath);
1003 if (S_ISLNK(st.st_mode))
1005 if (S_ISDIR(st.st_mode)) {
1006 struct pending_dir *next = malloc(sizeof(*next));
1011 strcpy(next->name, fullpath);
1012 list_add_tail(&next->list, &pending_list);
1014 if (!S_ISBLK(st.st_mode)) {
1017 fd = open(fullpath, O_RDONLY);
1019 /* ignore the following errors:
1020 ENXIO (device don't exists)
1021 ENOMEDIUM (No medium found ->
1022 like a cd tray empty)
1024 if(errno != ENXIO && errno != ENOMEDIUM)
1025 fprintf(stderr, "failed to read %s: %s\n",
1026 fullpath, strerror(errno));
1029 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1031 BTRFS_SUPER_INFO_OFFSET);
1032 if (ret == 0 && run_ioctl > 0) {
1033 btrfs_register_one_device(fullpath);
1037 if (!list_empty(&pending_list)) {
1039 pending = list_entry(pending_list.next, struct pending_dir,
1042 list_del(&pending->list);
1056 int btrfs_scan_for_fsid(struct btrfs_fs_devices *fs_devices, u64 total_devs,
1061 ret = btrfs_scan_block_devices(run_ioctls);
1063 ret = btrfs_scan_one_dir("/dev", run_ioctls);
1067 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1070 struct btrfs_super_block *disk_super;
1074 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1079 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1080 if (ret != BTRFS_SUPER_INFO_SIZE)
1084 disk_super = (struct btrfs_super_block *)buf;
1085 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1086 sizeof(disk_super->magic)))
1089 if (!memcmp(disk_super->fsid, root->fs_info->super_copy.fsid,
1098 static char *size_strs[] = { "", "KB", "MB", "GB", "TB",
1099 "PB", "EB", "ZB", "YB"};
1100 char *pretty_sizes(u64 size)
1103 int pretty_len = 16;
1111 u64 last_size = size;
1113 while(size >= 1024){
1119 if (num_divs > ARRAY_SIZE(size_strs))
1121 fraction = (float)last_size / 1024;
1123 pretty = malloc(pretty_len);
1124 snprintf(pretty, pretty_len, "%.2f%s", fraction, size_strs[num_divs]);
1129 * Checks to make sure that the label matches our requirements.
1131 0 if everything is safe and usable
1132 -1 if the label is too long
1133 -2 if the label contains an invalid character
1135 int check_label(char *input)
1138 int len = strlen(input);
1140 if (len > BTRFS_LABEL_SIZE) {
1144 for (i = 0; i < len; i++) {
1145 if (input[i] == '/' || input[i] == '\\') {
1153 int btrfs_scan_block_devices(int run_ioctl)
1159 struct btrfs_fs_devices *tmp_devices;
1161 FILE *proc_partitions;
1169 proc_partitions = fopen("/proc/partitions","r");
1170 if (!proc_partitions) {
1171 fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
1174 /* skip the header */
1175 for(i=0; i < 2 ; i++)
1176 if(!fgets(buf, 1023, proc_partitions)){
1177 fprintf(stderr, "Unable to read '/proc/partitions' for scanning\n");
1178 fclose(proc_partitions);
1182 strcpy(fullpath,"/dev/");
1183 while(fgets(buf, 1023, proc_partitions)) {
1184 i = sscanf(buf," %*d %*d %*d %99s", fullpath+5);
1187 * multipath and MD devices may register as a btrfs filesystem
1188 * both through the original block device and through
1189 * the special (/dev/mapper or /dev/mdX) entry.
1190 * This scans the special entries last
1192 special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
1194 special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
1196 if (scans == 0 && special)
1198 if (scans > 0 && !special)
1201 ret = lstat(fullpath, &st);
1203 fprintf(stderr, "failed to stat %s\n", fullpath);
1206 if (!S_ISBLK(st.st_mode)) {
1210 fd = open(fullpath, O_RDONLY);
1212 fprintf(stderr, "failed to read %s\n", fullpath);
1215 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1217 BTRFS_SUPER_INFO_OFFSET);
1218 if (ret == 0 && run_ioctl > 0) {
1219 btrfs_register_one_device(fullpath);
1224 fclose(proc_partitions);
1233 u64 parse_size(char *s)
1239 for (i=0 ; s[i] && isdigit(s[i]) ; i++) ;
1241 fprintf(stderr, "ERROR: size value is empty\n");
1263 fprintf(stderr, "ERROR: Unknown size descriptor "
1268 if (s[i] && s[i+1]) {
1269 fprintf(stderr, "ERROR: Illegal suffix contains "
1270 "character '%c' in wrong position\n",
1274 return strtoull(s, NULL, 10) * mult;