2 * Copyright (C) 2007 Oracle. All rights reserved.
3 * Copyright (C) 2008 Morey Roof. All rights reserved.
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.
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.
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.
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 */
27 #include <sys/ioctl.h>
28 #include <sys/mount.h>
29 #include <sys/types.h>
31 #include <uuid/uuid.h>
36 #include <linux/loop.h>
37 #include <linux/major.h>
38 #include <linux/kdev_t.h>
40 #include <blkid/blkid.h>
41 #include "kerncompat.h"
42 #include "radix-tree.h"
45 #include "transaction.h"
52 #define BLKDISCARD _IO(0x12,119)
56 discard_blocks(int fd, u64 start, u64 len)
58 u64 range[2] = { start, len };
60 if (ioctl(fd, BLKDISCARD, &range) < 0)
65 static u64 reference_root_table[] = {
66 [1] = BTRFS_ROOT_TREE_OBJECTID,
67 [2] = BTRFS_EXTENT_TREE_OBJECTID,
68 [3] = BTRFS_CHUNK_TREE_OBJECTID,
69 [4] = BTRFS_DEV_TREE_OBJECTID,
70 [5] = BTRFS_FS_TREE_OBJECTID,
71 [6] = BTRFS_CSUM_TREE_OBJECTID,
74 int make_btrfs(int fd, const char *device, const char *label,
75 u64 blocks[7], u64 num_bytes, u32 nodesize,
76 u32 leafsize, u32 sectorsize, u32 stripesize, u64 features)
78 struct btrfs_super_block super;
79 struct extent_buffer *buf;
80 struct btrfs_root_item root_item;
81 struct btrfs_disk_key disk_key;
82 struct btrfs_extent_item *extent_item;
83 struct btrfs_inode_item *inode_item;
84 struct btrfs_chunk *chunk;
85 struct btrfs_dev_item *dev_item;
86 struct btrfs_dev_extent *dev_extent;
87 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
97 int skinny_metadata = !!(features &
98 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
100 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
101 first_free &= ~((u64)sectorsize - 1);
103 memset(&super, 0, sizeof(super));
105 num_bytes = (num_bytes / sectorsize) * sectorsize;
106 uuid_generate(super.fsid);
107 uuid_generate(super.dev_item.uuid);
108 uuid_generate(chunk_tree_uuid);
110 btrfs_set_super_bytenr(&super, blocks[0]);
111 btrfs_set_super_num_devices(&super, 1);
112 btrfs_set_super_magic(&super, BTRFS_MAGIC);
113 btrfs_set_super_generation(&super, 1);
114 btrfs_set_super_root(&super, blocks[1]);
115 btrfs_set_super_chunk_root(&super, blocks[3]);
116 btrfs_set_super_total_bytes(&super, num_bytes);
117 btrfs_set_super_bytes_used(&super, 6 * leafsize);
118 btrfs_set_super_sectorsize(&super, sectorsize);
119 btrfs_set_super_leafsize(&super, leafsize);
120 btrfs_set_super_nodesize(&super, nodesize);
121 btrfs_set_super_stripesize(&super, stripesize);
122 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
123 btrfs_set_super_chunk_root_generation(&super, 1);
124 btrfs_set_super_cache_generation(&super, -1);
125 btrfs_set_super_incompat_flags(&super, features);
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(), 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(nritems), itemoff);
168 btrfs_set_item_size(buf, btrfs_item_nr(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(nritems), itemoff);
179 btrfs_set_item_size(buf, btrfs_item_nr(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(nritems), itemoff);
191 btrfs_set_item_size(buf, btrfs_item_nr(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(nritems), itemoff);
203 btrfs_set_item_size(buf, btrfs_item_nr(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]);
215 else if (ret != leafsize)
218 /* create the items for the extent tree */
219 memset(buf->data+sizeof(struct btrfs_header), 0,
220 leafsize-sizeof(struct btrfs_header));
222 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
223 for (i = 1; i < 7; i++) {
224 item_size = sizeof(struct btrfs_extent_item);
225 if (!skinny_metadata)
226 item_size += sizeof(struct btrfs_tree_block_info);
228 BUG_ON(blocks[i] < first_free);
229 BUG_ON(blocks[i] < blocks[i - 1]);
231 /* create extent item */
232 itemoff -= item_size;
233 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
234 if (skinny_metadata) {
235 btrfs_set_disk_key_type(&disk_key,
236 BTRFS_METADATA_ITEM_KEY);
237 btrfs_set_disk_key_offset(&disk_key, 0);
239 btrfs_set_disk_key_type(&disk_key,
240 BTRFS_EXTENT_ITEM_KEY);
241 btrfs_set_disk_key_offset(&disk_key, leafsize);
243 btrfs_set_item_key(buf, &disk_key, nritems);
244 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
246 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
248 extent_item = btrfs_item_ptr(buf, nritems,
249 struct btrfs_extent_item);
250 btrfs_set_extent_refs(buf, extent_item, 1);
251 btrfs_set_extent_generation(buf, extent_item, 1);
252 btrfs_set_extent_flags(buf, extent_item,
253 BTRFS_EXTENT_FLAG_TREE_BLOCK);
256 /* create extent ref */
257 ref_root = reference_root_table[i];
258 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
259 btrfs_set_disk_key_offset(&disk_key, ref_root);
260 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
261 btrfs_set_item_key(buf, &disk_key, nritems);
262 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
264 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
267 btrfs_set_header_bytenr(buf, blocks[2]);
268 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
269 btrfs_set_header_nritems(buf, nritems);
270 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
271 ret = pwrite(fd, buf->data, leafsize, blocks[2]);
274 else if (ret != leafsize)
277 /* create the chunk tree */
278 memset(buf->data+sizeof(struct btrfs_header), 0,
279 leafsize-sizeof(struct btrfs_header));
281 item_size = sizeof(*dev_item);
282 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
284 /* first device 1 (there is no device 0) */
285 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
286 btrfs_set_disk_key_offset(&disk_key, 1);
287 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
288 btrfs_set_item_key(buf, &disk_key, nritems);
289 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
290 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
292 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
293 btrfs_set_device_id(buf, dev_item, 1);
294 btrfs_set_device_generation(buf, dev_item, 0);
295 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
296 btrfs_set_device_bytes_used(buf, dev_item,
297 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
298 btrfs_set_device_io_align(buf, dev_item, sectorsize);
299 btrfs_set_device_io_width(buf, dev_item, sectorsize);
300 btrfs_set_device_sector_size(buf, dev_item, sectorsize);
301 btrfs_set_device_type(buf, dev_item, 0);
303 write_extent_buffer(buf, super.dev_item.uuid,
304 (unsigned long)btrfs_device_uuid(dev_item),
306 write_extent_buffer(buf, super.fsid,
307 (unsigned long)btrfs_device_fsid(dev_item),
309 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
313 item_size = btrfs_chunk_item_size(1);
314 itemoff = itemoff - item_size;
316 /* then we have chunk 0 */
317 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
318 btrfs_set_disk_key_offset(&disk_key, 0);
319 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
320 btrfs_set_item_key(buf, &disk_key, nritems);
321 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
322 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
324 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
325 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
326 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
327 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
328 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
329 btrfs_set_chunk_io_align(buf, chunk, sectorsize);
330 btrfs_set_chunk_io_width(buf, chunk, sectorsize);
331 btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
332 btrfs_set_chunk_num_stripes(buf, chunk, 1);
333 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
334 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
337 write_extent_buffer(buf, super.dev_item.uuid,
338 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
341 /* copy the key for the chunk to the system array */
342 ptr = super.sys_chunk_array;
343 array_size = sizeof(disk_key);
345 memcpy(ptr, &disk_key, sizeof(disk_key));
346 ptr += sizeof(disk_key);
348 /* copy the chunk to the system array */
349 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
350 array_size += item_size;
352 btrfs_set_super_sys_array_size(&super, array_size);
354 btrfs_set_header_bytenr(buf, blocks[3]);
355 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
356 btrfs_set_header_nritems(buf, nritems);
357 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
358 ret = pwrite(fd, buf->data, leafsize, blocks[3]);
361 else if (ret != leafsize)
364 /* create the device tree */
365 memset(buf->data+sizeof(struct btrfs_header), 0,
366 leafsize-sizeof(struct btrfs_header));
368 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
369 sizeof(struct btrfs_dev_extent);
371 btrfs_set_disk_key_objectid(&disk_key, 1);
372 btrfs_set_disk_key_offset(&disk_key, 0);
373 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
374 btrfs_set_item_key(buf, &disk_key, nritems);
375 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
376 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
377 sizeof(struct btrfs_dev_extent));
378 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
379 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
380 BTRFS_CHUNK_TREE_OBJECTID);
381 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
382 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
383 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
385 write_extent_buffer(buf, chunk_tree_uuid,
386 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
389 btrfs_set_dev_extent_length(buf, dev_extent,
390 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
393 btrfs_set_header_bytenr(buf, blocks[4]);
394 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
395 btrfs_set_header_nritems(buf, nritems);
396 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
397 ret = pwrite(fd, buf->data, leafsize, blocks[4]);
400 else if (ret != leafsize)
403 /* create the FS root */
404 memset(buf->data+sizeof(struct btrfs_header), 0,
405 leafsize-sizeof(struct btrfs_header));
406 btrfs_set_header_bytenr(buf, blocks[5]);
407 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
408 btrfs_set_header_nritems(buf, 0);
409 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
410 ret = pwrite(fd, buf->data, leafsize, blocks[5]);
413 else if (ret != leafsize)
416 /* finally create the csum root */
417 memset(buf->data+sizeof(struct btrfs_header), 0,
418 leafsize-sizeof(struct btrfs_header));
419 btrfs_set_header_bytenr(buf, blocks[6]);
420 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
421 btrfs_set_header_nritems(buf, 0);
422 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
423 ret = pwrite(fd, buf->data, leafsize, blocks[6]);
426 else if (ret != leafsize)
429 /* and write out the super block */
430 BUG_ON(sizeof(super) > sectorsize);
431 memset(buf->data, 0, sectorsize);
432 memcpy(buf->data, &super, sizeof(super));
433 buf->len = sectorsize;
434 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
435 ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
438 else if (ret != sectorsize)
445 u64 btrfs_device_size(int fd, struct stat *st)
448 if (S_ISREG(st->st_mode)) {
451 if (!S_ISBLK(st->st_mode)) {
454 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
460 static int zero_blocks(int fd, off_t start, size_t len)
462 char *buf = malloc(len);
469 written = pwrite(fd, buf, len, start);
476 static int zero_dev_start(int fd)
479 size_t len = 2 * 1024 * 1024;
482 /* don't overwrite the disk labels on sparc */
486 return zero_blocks(fd, start, len);
489 static int zero_dev_end(int fd, u64 dev_size)
491 size_t len = 2 * 1024 * 1024;
492 off_t start = dev_size - len;
494 return zero_blocks(fd, start, len);
497 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
498 struct btrfs_root *root, int fd, char *path,
499 u64 block_count, u32 io_width, u32 io_align,
502 struct btrfs_super_block *disk_super;
503 struct btrfs_super_block *super = root->fs_info->super_copy;
504 struct btrfs_device *device;
505 struct btrfs_dev_item *dev_item;
511 device = kzalloc(sizeof(*device), GFP_NOFS);
514 buf = kmalloc(sectorsize, GFP_NOFS);
519 BUG_ON(sizeof(*disk_super) > sectorsize);
520 memset(buf, 0, sectorsize);
522 disk_super = (struct btrfs_super_block *)buf;
523 dev_item = &disk_super->dev_item;
525 uuid_generate(device->uuid);
528 device->io_width = io_width;
529 device->io_align = io_align;
530 device->sector_size = sectorsize;
532 device->writeable = 1;
533 device->total_bytes = block_count;
534 device->bytes_used = 0;
535 device->total_ios = 0;
536 device->dev_root = root->fs_info->dev_root;
538 ret = btrfs_add_device(trans, root, device);
541 total_bytes = btrfs_super_total_bytes(super) + block_count;
542 btrfs_set_super_total_bytes(super, total_bytes);
544 num_devs = btrfs_super_num_devices(super) + 1;
545 btrfs_set_super_num_devices(super, num_devs);
547 memcpy(disk_super, super, sizeof(*disk_super));
549 printf("adding device %s id %llu\n", path,
550 (unsigned long long)device->devid);
552 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
553 btrfs_set_stack_device_id(dev_item, device->devid);
554 btrfs_set_stack_device_type(dev_item, device->type);
555 btrfs_set_stack_device_io_align(dev_item, device->io_align);
556 btrfs_set_stack_device_io_width(dev_item, device->io_width);
557 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
558 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
559 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
560 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
562 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
563 BUG_ON(ret != sectorsize);
566 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
567 device->fs_devices = root->fs_info->fs_devices;
571 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
572 u64 max_block_count, int *mixed, int discard)
579 ret = fstat(fd, &st);
581 fprintf(stderr, "unable to stat %s\n", file);
585 block_count = btrfs_device_size(fd, &st);
586 if (block_count == 0) {
587 fprintf(stderr, "unable to find %s size\n", file);
591 block_count = min(block_count, max_block_count);
594 if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
595 printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
601 * We intentionally ignore errors from the discard ioctl. It
602 * is not necessary for the mkfs functionality but just an
605 if (discard_blocks(fd, 0, 0) == 0) {
606 fprintf(stderr, "Performing full device TRIM (%s) ...\n",
607 pretty_size(block_count));
608 discard_blocks(fd, 0, block_count);
612 ret = zero_dev_start(fd);
614 fprintf(stderr, "failed to zero device start %d\n", ret);
618 for (i = 0 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
619 bytenr = btrfs_sb_offset(i);
620 if (bytenr >= block_count)
622 zero_blocks(fd, bytenr, BTRFS_SUPER_INFO_SIZE);
626 ret = zero_dev_end(fd, block_count);
628 fprintf(stderr, "failed to zero device end %d\n", ret);
632 *block_count_ret = block_count;
636 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
637 struct btrfs_root *root, u64 objectid)
640 struct btrfs_inode_item inode_item;
641 time_t now = time(NULL);
643 memset(&inode_item, 0, sizeof(inode_item));
644 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
645 btrfs_set_stack_inode_size(&inode_item, 0);
646 btrfs_set_stack_inode_nlink(&inode_item, 1);
647 btrfs_set_stack_inode_nbytes(&inode_item, root->leafsize);
648 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
649 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
650 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
651 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
652 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
653 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
654 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
655 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
656 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
658 if (root->fs_info->tree_root == root)
659 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
661 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
665 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
669 btrfs_set_root_dirid(&root->root_item, objectid);
676 * checks if a path is a block device node
677 * Returns negative errno on failure, otherwise
678 * returns 1 for blockdev, 0 for not-blockdev
680 int is_block_device(const char *path) {
683 if (stat(path, &statbuf) < 0)
686 return S_ISBLK(statbuf.st_mode);
690 * Find the mount point for a mounted device.
691 * On success, returns 0 with mountpoint in *mp.
692 * On failure, returns -errno (not mounted yields -EINVAL)
693 * Is noisy on failures, expects to be given a mounted device.
695 static int get_btrfs_mount(const char *dev, char *mp, size_t mp_size) {
699 ret = is_block_device(dev);
702 fprintf(stderr, "%s is not a block device\n", dev);
705 fprintf(stderr, "Could not check %s: %s\n",
706 dev, strerror(-ret));
711 fd = open(dev, O_RDONLY);
714 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
718 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
720 fprintf(stderr, "%s is not a mounted btrfs device\n", dev);
722 } else { /* mounted, all good */
729 fprintf(stderr, "Could not get mountpoint for %s\n", dev);
734 * Given a pathname, return a filehandle to:
735 * the original pathname or,
736 * if the pathname is a mounted btrfs device, to its mountpoint.
738 * On error, return -1, errno should be set.
740 int open_path_or_dev_mnt(const char *path, DIR **dirstream)
742 char mp[BTRFS_PATH_NAME_MAX + 1];
745 if (is_block_device(path)) {
748 ret = get_btrfs_mount(path, mp, sizeof(mp));
750 /* not a mounted btrfs dev */
754 fdmnt = open_file_or_dir(mp, dirstream);
756 fdmnt = open_file_or_dir(path, dirstream);
762 /* checks if a device is a loop device */
763 static int is_loop_device (const char* device) {
766 if(stat(device, &statbuf) < 0)
769 return (S_ISBLK(statbuf.st_mode) &&
770 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
774 /* Takes a loop device path (e.g. /dev/loop0) and returns
775 * the associated file (e.g. /images/my_btrfs.img) */
776 static int resolve_loop_device(const char* loop_dev, char* loop_file,
783 char real_loop_dev[PATH_MAX];
785 if (!realpath(loop_dev, real_loop_dev))
787 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
788 if (!(f = fopen(p, "r")))
791 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
792 ret = fscanf(f, fmt, loop_file);
800 /* Checks whether a and b are identical or device
801 * files associated with the same block device
803 static int is_same_blk_file(const char* a, const char* b)
805 struct stat st_buf_a, st_buf_b;
806 char real_a[PATH_MAX];
807 char real_b[PATH_MAX];
809 if(!realpath(a, real_a) ||
810 !realpath(b, real_b))
815 /* Identical path? */
816 if(strcmp(real_a, real_b) == 0)
819 if(stat(a, &st_buf_a) < 0 ||
820 stat(b, &st_buf_b) < 0)
827 /* Same blockdevice? */
828 if(S_ISBLK(st_buf_a.st_mode) &&
829 S_ISBLK(st_buf_b.st_mode) &&
830 st_buf_a.st_rdev == st_buf_b.st_rdev)
836 if (st_buf_a.st_dev == st_buf_b.st_dev &&
837 st_buf_a.st_ino == st_buf_b.st_ino)
845 /* checks if a and b are identical or device
846 * files associated with the same block device or
847 * if one file is a loop device that uses the other
850 static int is_same_loop_file(const char* a, const char* b)
852 char res_a[PATH_MAX];
853 char res_b[PATH_MAX];
858 /* Resolve a if it is a loop device */
859 if((ret = is_loop_device(a)) < 0) {
864 if ((ret = resolve_loop_device(a, res_a, sizeof(res_a))) < 0)
872 /* Resolve b if it is a loop device */
873 if ((ret = is_loop_device(b)) < 0) {
878 if((ret = resolve_loop_device(b, res_b, sizeof(res_b))) < 0)
886 return is_same_blk_file(final_a, final_b);
889 /* Checks if a file exists and is a block or regular file*/
890 static int is_existing_blk_or_reg_file(const char* filename)
894 if(stat(filename, &st_buf) < 0) {
901 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
904 /* Checks if a file is used (directly or indirectly via a loop device)
905 * by a device in fs_devices
907 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
911 struct list_head *head;
912 struct list_head *cur;
913 struct btrfs_device *device;
915 head = &fs_devices->devices;
916 list_for_each(cur, head) {
917 device = list_entry(cur, struct btrfs_device, dev_list);
919 if((ret = is_same_loop_file(device->name, file)))
927 * returns 1 if the device was mounted, < 0 on error or 0 if everything
928 * is safe to continue.
930 int check_mounted(const char* file)
935 fd = open(file, O_RDONLY);
937 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
941 ret = check_mounted_where(fd, file, NULL, 0, NULL);
947 int check_mounted_where(int fd, const char *file, char *where, int size,
948 struct btrfs_fs_devices **fs_dev_ret)
953 struct btrfs_fs_devices *fs_devices_mnt = NULL;
957 /* scan the initial device */
958 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
959 &total_devs, BTRFS_SUPER_INFO_OFFSET);
960 is_btrfs = (ret >= 0);
962 /* scan other devices */
963 if (is_btrfs && total_devs > 1) {
964 if((ret = btrfs_scan_for_fsid(0)))
968 /* iterate over the list of currently mountes filesystems */
969 if ((f = setmntent ("/proc/mounts", "r")) == NULL)
972 while ((mnt = getmntent (f)) != NULL) {
974 if(strcmp(mnt->mnt_type, "btrfs") != 0)
977 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
979 /* ignore entries in the mount table that are not
980 associated with a file*/
981 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
982 goto out_mntloop_err;
986 ret = is_same_loop_file(file, mnt->mnt_fsname);
990 goto out_mntloop_err;
995 /* Did we find an entry in mnt table? */
996 if (mnt && size && where) {
997 strncpy(where, mnt->mnt_dir, size);
1001 *fs_dev_ret = fs_devices_mnt;
1003 ret = (mnt != NULL);
1011 struct pending_dir {
1012 struct list_head list;
1013 char name[PATH_MAX];
1016 void btrfs_register_one_device(char *fname)
1018 struct btrfs_ioctl_vol_args args;
1023 fd = open("/dev/btrfs-control", O_RDONLY);
1025 fprintf(stderr, "failed to open /dev/btrfs-control "
1026 "skipping device registration: %s\n",
1030 strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
1031 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
1032 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1035 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1036 fname, strerror(e));
1041 int btrfs_scan_one_dir(char *dirname, int run_ioctl)
1044 struct dirent *dirent;
1045 struct pending_dir *pending;
1051 struct list_head pending_list;
1052 struct btrfs_fs_devices *tmp_devices;
1055 INIT_LIST_HEAD(&pending_list);
1057 pending = malloc(sizeof(*pending));
1060 strcpy(pending->name, dirname);
1063 dirname_len = strlen(pending->name);
1064 fullpath = malloc(PATH_MAX);
1065 dirname = pending->name;
1071 dirp = opendir(dirname);
1073 fprintf(stderr, "Unable to open %s for scanning\n", dirname);
1078 dirent = readdir(dirp);
1081 if (dirent->d_name[0] == '.')
1083 if (dirname_len + strlen(dirent->d_name) + 2 > PATH_MAX) {
1087 snprintf(fullpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
1088 ret = lstat(fullpath, &st);
1090 fprintf(stderr, "failed to stat %s\n", fullpath);
1093 if (S_ISLNK(st.st_mode))
1095 if (S_ISDIR(st.st_mode)) {
1096 struct pending_dir *next = malloc(sizeof(*next));
1101 strcpy(next->name, fullpath);
1102 list_add_tail(&next->list, &pending_list);
1104 if (!S_ISBLK(st.st_mode)) {
1107 fd = open(fullpath, O_RDONLY);
1109 /* ignore the following errors:
1110 ENXIO (device don't exists)
1111 ENOMEDIUM (No medium found ->
1112 like a cd tray empty)
1114 if(errno != ENXIO && errno != ENOMEDIUM)
1115 fprintf(stderr, "failed to read %s: %s\n",
1116 fullpath, strerror(errno));
1119 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1121 BTRFS_SUPER_INFO_OFFSET);
1122 if (ret == 0 && run_ioctl > 0) {
1123 btrfs_register_one_device(fullpath);
1127 if (!list_empty(&pending_list)) {
1129 pending = list_entry(pending_list.next, struct pending_dir,
1132 list_del(&pending->list);
1141 while (!list_empty(&pending_list)) {
1142 pending = list_entry(pending_list.next, struct pending_dir,
1144 list_del(&pending->list);
1152 int btrfs_scan_for_fsid(int run_ioctls)
1156 ret = scan_for_btrfs(BTRFS_SCAN_PROC, run_ioctls);
1158 ret = scan_for_btrfs(BTRFS_SCAN_DEV, run_ioctls);
1162 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1165 struct btrfs_super_block *disk_super;
1169 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1174 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1175 if (ret != BTRFS_SUPER_INFO_SIZE)
1179 disk_super = (struct btrfs_super_block *)buf;
1180 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1183 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1192 static char *size_strs[] = { "", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1193 void pretty_size_snprintf(u64 size, char *str, size_t str_bytes)
1205 u64 last_size = size;
1207 while(size >= 1024){
1213 if (num_divs >= ARRAY_SIZE(size_strs)) {
1217 fraction = (float)last_size / 1024;
1219 snprintf(str, str_bytes, "%.2f%s", fraction, size_strs[num_divs]);
1223 * __strncpy__null - strncpy with null termination
1224 * @dest: the target array
1225 * @src: the source string
1226 * @n: maximum bytes to copy (size of *dest)
1228 * Like strncpy, but ensures destination is null-terminated.
1230 * Copies the string pointed to by src, including the terminating null
1231 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1232 * of n bytes. Then ensure that dest is null-terminated.
1234 char *__strncpy__null(char *dest, const char *src, size_t n)
1236 strncpy(dest, src, n);
1243 * Checks to make sure that the label matches our requirements.
1245 0 if everything is safe and usable
1246 -1 if the label is too long
1248 static int check_label(const char *input)
1250 int len = strlen(input);
1252 if (len > BTRFS_LABEL_SIZE - 1) {
1253 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1254 input, BTRFS_LABEL_SIZE - 1);
1261 static int set_label_unmounted(const char *dev, const char *label)
1263 struct btrfs_trans_handle *trans;
1264 struct btrfs_root *root;
1267 ret = check_mounted(dev);
1269 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1273 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1278 /* Open the super_block at the default location
1279 * and as read-write.
1281 root = open_ctree(dev, 0, 1);
1282 if (!root) /* errors are printed by open_ctree() */
1285 trans = btrfs_start_transaction(root, 1);
1286 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1288 btrfs_commit_transaction(trans, root);
1290 /* Now we close it since we are done. */
1295 static int set_label_mounted(const char *mount_path, const char *label)
1299 fd = open(mount_path, O_RDONLY | O_NOATIME);
1301 fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
1305 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1306 fprintf(stderr, "ERROR: unable to set label %s\n",
1316 static int get_label_unmounted(const char *dev)
1318 struct btrfs_root *root;
1321 ret = check_mounted(dev);
1323 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1327 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1332 /* Open the super_block at the default location
1335 root = open_ctree(dev, 0, 0);
1339 fprintf(stdout, "%s\n", root->fs_info->super_copy->label);
1341 /* Now we close it since we are done. */
1347 * If a partition is mounted, try to get the filesystem label via its
1348 * mounted path rather than device. Return the corresponding error
1349 * the user specified the device path.
1351 int get_label_mounted(const char *mount_path, char *labelp)
1353 char label[BTRFS_LABEL_SIZE];
1356 fd = open(mount_path, O_RDONLY | O_NOATIME);
1358 fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
1362 memset(label, '\0', sizeof(label));
1363 if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
1364 fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
1369 strncpy(labelp, label, sizeof(label));
1374 int get_label(const char *btrfs_dev)
1377 char label[BTRFS_LABEL_SIZE];
1379 if (is_existing_blk_or_reg_file(btrfs_dev))
1380 ret = get_label_unmounted(btrfs_dev);
1382 ret = get_label_mounted(btrfs_dev, label);
1384 fprintf(stdout, "%s\n", label);
1389 int set_label(const char *btrfs_dev, const char *label)
1391 if (check_label(label))
1394 return is_existing_blk_or_reg_file(btrfs_dev) ?
1395 set_label_unmounted(btrfs_dev, label) :
1396 set_label_mounted(btrfs_dev, label);
1399 int btrfs_scan_block_devices(int run_ioctl)
1405 struct btrfs_fs_devices *tmp_devices;
1407 FILE *proc_partitions;
1415 proc_partitions = fopen("/proc/partitions","r");
1416 if (!proc_partitions) {
1417 fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
1420 /* skip the header */
1421 for (i = 0; i < 2; i++)
1422 if (!fgets(buf, 1023, proc_partitions)) {
1424 "Unable to read '/proc/partitions' for scanning\n");
1425 fclose(proc_partitions);
1429 strcpy(fullpath,"/dev/");
1430 while(fgets(buf, 1023, proc_partitions)) {
1431 i = sscanf(buf," %*d %*d %*d %99s", fullpath+5);
1434 * multipath and MD devices may register as a btrfs filesystem
1435 * both through the original block device and through
1436 * the special (/dev/mapper or /dev/mdX) entry.
1437 * This scans the special entries last
1439 special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
1441 special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
1443 if (scans == 0 && special)
1445 if (scans > 0 && !special)
1448 ret = lstat(fullpath, &st);
1450 fprintf(stderr, "failed to stat %s\n", fullpath);
1453 if (!S_ISBLK(st.st_mode)) {
1457 fd = open(fullpath, O_RDONLY);
1459 if (errno != ENOMEDIUM)
1460 fprintf(stderr, "failed to open %s: %s\n",
1461 fullpath, strerror(errno));
1464 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1466 BTRFS_SUPER_INFO_OFFSET);
1467 if (ret == 0 && run_ioctl > 0) {
1468 btrfs_register_one_device(fullpath);
1473 fclose(proc_partitions);
1482 u64 parse_size(char *s)
1488 for (i = 0; s && s[i] && isdigit(s[i]); i++) ;
1490 fprintf(stderr, "ERROR: size value is empty\n");
1512 fprintf(stderr, "ERROR: Unknown size descriptor "
1517 if (s[i] && s[i+1]) {
1518 fprintf(stderr, "ERROR: Illegal suffix contains "
1519 "character '%c' in wrong position\n",
1523 return strtoull(s, NULL, 10) * mult;
1526 int open_file_or_dir(const char *fname, DIR **dirstream)
1532 ret = stat(fname, &st);
1536 if (S_ISDIR(st.st_mode)) {
1537 *dirstream = opendir(fname);
1540 fd = dirfd(*dirstream);
1542 fd = open(fname, O_RDWR);
1547 closedir(*dirstream);
1552 void close_file_or_dir(int fd, DIR *dirstream)
1555 closedir(dirstream);
1560 static int get_device_info(int fd, u64 devid,
1561 struct btrfs_ioctl_dev_info_args *di_args)
1565 di_args->devid = devid;
1566 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
1568 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
1569 return ret ? -errno : 0;
1573 * For a given path, fill in the ioctl fs_ and info_ args.
1574 * If the path is a btrfs mountpoint, fill info for all devices.
1575 * If the path is a btrfs device, fill in only that device.
1577 * The path provided must be either on a mounted btrfs fs,
1578 * or be a mounted btrfs device.
1580 * Returns 0 on success, or a negative errno.
1582 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
1583 struct btrfs_ioctl_dev_info_args **di_ret)
1589 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1590 struct btrfs_ioctl_dev_info_args *di_args;
1591 char mp[BTRFS_PATH_NAME_MAX + 1];
1592 DIR *dirstream = NULL;
1594 memset(fi_args, 0, sizeof(*fi_args));
1596 if (is_block_device(path)) {
1597 /* Ensure it's mounted, then set path to the mountpoint */
1598 fd = open(path, O_RDONLY);
1601 fprintf(stderr, "Couldn't open %s: %s\n",
1602 path, strerror(errno));
1605 ret = check_mounted_where(fd, path, mp, sizeof(mp),
1614 /* Only fill in this one device */
1615 fi_args->num_devices = 1;
1616 fi_args->max_id = fs_devices_mnt->latest_devid;
1617 i = fs_devices_mnt->latest_devid;
1618 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
1622 /* at this point path must not be for a block device */
1623 fd = open_file_or_dir(path, &dirstream);
1629 /* fill in fi_args if not just a single device */
1630 if (fi_args->num_devices != 1) {
1631 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
1638 if (!fi_args->num_devices)
1641 di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
1647 for (; i <= fi_args->max_id; ++i) {
1648 BUG_ON(ndevs >= fi_args->num_devices);
1649 ret = get_device_info(fd, i, &di_args[ndevs]);
1660 close_file_or_dir(fd, dirstream);
1664 #define isoctal(c) (((c) & ~7) == '0')
1666 static inline void translate(char *f, char *t)
1668 while (*f != '\0') {
1670 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
1671 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
1681 * Checks if the swap device.
1682 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
1684 static int is_swap_device(const char *file)
1695 if (stat(file, &st_buf) < 0)
1697 if (S_ISBLK(st_buf.st_mode))
1698 dev = st_buf.st_rdev;
1699 else if (S_ISREG(st_buf.st_mode)) {
1700 dev = st_buf.st_dev;
1701 ino = st_buf.st_ino;
1705 if ((f = fopen("/proc/swaps", "r")) == NULL)
1708 /* skip the first line */
1709 if (fgets(tmp, sizeof(tmp), f) == NULL)
1712 while (fgets(tmp, sizeof(tmp), f) != NULL) {
1713 if ((cp = strchr(tmp, ' ')) != NULL)
1715 if ((cp = strchr(tmp, '\t')) != NULL)
1717 translate(tmp, buf);
1718 if (stat(buf, &st_buf) != 0)
1720 if (S_ISBLK(st_buf.st_mode)) {
1721 if (dev == st_buf.st_rdev) {
1725 } else if (S_ISREG(st_buf.st_mode)) {
1726 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
1740 * Check for existing filesystem or partition table on device.
1742 * 1 for existing fs or partition
1743 * 0 for nothing found
1744 * -1 for internal error
1751 blkid_probe pr = NULL;
1755 if (!device || !*device)
1758 ret = -1; /* will reset on success of all setup calls */
1760 pr = blkid_new_probe_from_filename(device);
1764 size = blkid_probe_get_size(pr);
1768 /* nothing to overwrite on a 0-length device */
1774 ret = blkid_probe_enable_partitions(pr, 1);
1778 ret = blkid_do_fullprobe(pr);
1783 * Blkid returns 1 for nothing found and 0 when it finds a signature,
1784 * but we want the exact opposite, so reverse the return value here.
1786 * In addition print some useful diagnostics about what actually is
1794 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
1796 "%s appears to contain an existing "
1797 "filesystem (%s).\n", device, type);
1798 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
1800 "%s appears to contain a partition "
1801 "table (%s).\n", device, type);
1804 "%s appears to contain something weird "
1805 "according to blkid\n", device);
1811 blkid_free_probe(pr);
1814 "probe of %s failed, cannot detect "
1815 "existing filesystem.\n", device);
1819 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
1820 u64 dev_cnt, int mixed, char *estr)
1828 allowed |= BTRFS_BLOCK_GROUP_RAID10;
1830 allowed |= BTRFS_BLOCK_GROUP_RAID6;
1832 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
1833 BTRFS_BLOCK_GROUP_RAID5;
1836 allowed |= BTRFS_BLOCK_GROUP_DUP;
1839 if (metadata_profile & ~allowed) {
1840 snprintf(estr, sz, "unable to create FS with metadata "
1841 "profile %llu (have %llu devices)\n",
1842 metadata_profile, dev_cnt);
1845 if (data_profile & ~allowed) {
1846 snprintf(estr, sz, "unable to create FS with data "
1847 "profile %llu (have %llu devices)\n",
1848 metadata_profile, dev_cnt);
1852 if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
1854 "dup for data is allowed only in mixed mode");
1860 /* Check if disk is suitable for btrfs
1862 * 1: something is wrong, estr provides the error
1865 int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
1871 ret = is_swap_device(file);
1873 snprintf(estr, sz, "error checking %s status: %s\n", file,
1878 snprintf(estr, sz, "%s is a swap device\n", file);
1881 if (!force_overwrite) {
1882 if (check_overwrite(file)) {
1883 snprintf(estr, sz, "Use the -f option to force overwrite.\n");
1887 ret = check_mounted(file);
1889 snprintf(estr, sz, "error checking %s mount status\n",
1894 snprintf(estr, sz, "%s is mounted\n", file);
1897 /* check if the device is busy */
1898 fd = open(file, O_RDWR|O_EXCL);
1900 snprintf(estr, sz, "unable to open %s: %s\n", file,
1904 if (fstat(fd, &st)) {
1905 snprintf(estr, sz, "unable to stat %s: %s\n", file,
1909 if (!S_ISBLK(st.st_mode)) {
1910 fprintf(stderr, "'%s' is not a block device\n", file);
1918 * scans devs for the btrfs
1920 int scan_for_btrfs(int where, int update_kernel)
1925 case BTRFS_SCAN_PROC:
1926 ret = btrfs_scan_block_devices(update_kernel);
1928 case BTRFS_SCAN_DEV:
1929 ret = btrfs_scan_one_dir("/dev", update_kernel);
1935 int is_vol_small(char *file)
1942 fd = open(file, O_RDONLY);
1945 if (fstat(fd, &st) < 0) {
1950 size = btrfs_device_size(fd, &st);
1955 if (size < 1024 * 1024 * 1024) {
1965 * This reads a line from the stdin and only returns non-zero if the
1966 * first whitespace delimited token is a case insensitive match with yes
1969 int ask_user(char *question)
1971 char buf[30] = {0,};
1972 char *saveptr = NULL;
1975 printf("%s [y/N]: ", question);
1977 return fgets(buf, sizeof(buf) - 1, stdin) &&
1978 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
1979 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
1984 * - file or directory return the containing tree root id
1985 * - subvolume return it's own tree id
1986 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
1987 * undefined and function returns -1
1989 int lookup_ino_rootid(int fd, u64 *rootid)
1991 struct btrfs_ioctl_ino_lookup_args args;
1995 memset(&args, 0, sizeof(args));
1997 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
1999 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2002 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2007 *rootid = args.treeid;