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 the given range in one go
58 static int discard_range(int fd, u64 start, u64 len)
60 u64 range[2] = { start, len };
62 if (ioctl(fd, BLKDISCARD, &range) < 0)
68 * Discard blocks in the given range in 1G chunks, the process is interruptible
70 static int discard_blocks(int fd, u64 start, u64 len)
74 u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
77 ret = discard_range(fd, start, chunk_size);
87 static u64 reference_root_table[] = {
88 [1] = BTRFS_ROOT_TREE_OBJECTID,
89 [2] = BTRFS_EXTENT_TREE_OBJECTID,
90 [3] = BTRFS_CHUNK_TREE_OBJECTID,
91 [4] = BTRFS_DEV_TREE_OBJECTID,
92 [5] = BTRFS_FS_TREE_OBJECTID,
93 [6] = BTRFS_CSUM_TREE_OBJECTID,
96 int make_btrfs(int fd, const char *device, const char *label,
97 u64 blocks[7], u64 num_bytes, u32 nodesize,
98 u32 leafsize, u32 sectorsize, u32 stripesize, u64 features)
100 struct btrfs_super_block super;
101 struct extent_buffer *buf;
102 struct btrfs_root_item root_item;
103 struct btrfs_disk_key disk_key;
104 struct btrfs_extent_item *extent_item;
105 struct btrfs_inode_item *inode_item;
106 struct btrfs_chunk *chunk;
107 struct btrfs_dev_item *dev_item;
108 struct btrfs_dev_extent *dev_extent;
109 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
119 int skinny_metadata = !!(features &
120 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
122 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
123 first_free &= ~((u64)sectorsize - 1);
125 memset(&super, 0, sizeof(super));
127 num_bytes = (num_bytes / sectorsize) * sectorsize;
128 uuid_generate(super.fsid);
129 uuid_generate(super.dev_item.uuid);
130 uuid_generate(chunk_tree_uuid);
132 btrfs_set_super_bytenr(&super, blocks[0]);
133 btrfs_set_super_num_devices(&super, 1);
134 btrfs_set_super_magic(&super, BTRFS_MAGIC);
135 btrfs_set_super_generation(&super, 1);
136 btrfs_set_super_root(&super, blocks[1]);
137 btrfs_set_super_chunk_root(&super, blocks[3]);
138 btrfs_set_super_total_bytes(&super, num_bytes);
139 btrfs_set_super_bytes_used(&super, 6 * leafsize);
140 btrfs_set_super_sectorsize(&super, sectorsize);
141 btrfs_set_super_leafsize(&super, leafsize);
142 btrfs_set_super_nodesize(&super, nodesize);
143 btrfs_set_super_stripesize(&super, stripesize);
144 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
145 btrfs_set_super_chunk_root_generation(&super, 1);
146 btrfs_set_super_cache_generation(&super, -1);
147 btrfs_set_super_incompat_flags(&super, features);
149 strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
151 buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
153 /* create the tree of root objects */
154 memset(buf->data, 0, leafsize);
156 btrfs_set_header_bytenr(buf, blocks[1]);
157 btrfs_set_header_nritems(buf, 4);
158 btrfs_set_header_generation(buf, 1);
159 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
160 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
161 write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
164 write_extent_buffer(buf, chunk_tree_uuid,
165 btrfs_header_chunk_tree_uuid(buf),
168 /* create the items for the root tree */
169 memset(&root_item, 0, sizeof(root_item));
170 inode_item = &root_item.inode;
171 btrfs_set_stack_inode_generation(inode_item, 1);
172 btrfs_set_stack_inode_size(inode_item, 3);
173 btrfs_set_stack_inode_nlink(inode_item, 1);
174 btrfs_set_stack_inode_nbytes(inode_item, leafsize);
175 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
176 btrfs_set_root_refs(&root_item, 1);
177 btrfs_set_root_used(&root_item, leafsize);
178 btrfs_set_root_generation(&root_item, 1);
180 memset(&disk_key, 0, sizeof(disk_key));
181 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
182 btrfs_set_disk_key_offset(&disk_key, 0);
185 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
186 btrfs_set_root_bytenr(&root_item, blocks[2]);
187 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
188 btrfs_set_item_key(buf, &disk_key, nritems);
189 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
190 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
192 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
193 nritems), sizeof(root_item));
196 itemoff = itemoff - sizeof(root_item);
197 btrfs_set_root_bytenr(&root_item, blocks[4]);
198 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
199 btrfs_set_item_key(buf, &disk_key, nritems);
200 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
201 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
203 write_extent_buffer(buf, &root_item,
204 btrfs_item_ptr_offset(buf, nritems),
208 itemoff = itemoff - sizeof(root_item);
209 btrfs_set_root_bytenr(&root_item, blocks[5]);
210 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
211 btrfs_set_item_key(buf, &disk_key, nritems);
212 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
213 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
215 write_extent_buffer(buf, &root_item,
216 btrfs_item_ptr_offset(buf, nritems),
220 itemoff = itemoff - sizeof(root_item);
221 btrfs_set_root_bytenr(&root_item, blocks[6]);
222 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
223 btrfs_set_item_key(buf, &disk_key, nritems);
224 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
225 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
227 write_extent_buffer(buf, &root_item,
228 btrfs_item_ptr_offset(buf, nritems),
233 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
234 ret = pwrite(fd, buf->data, leafsize, blocks[1]);
235 if (ret != leafsize) {
236 ret = (ret < 0 ? -errno : -EIO);
240 /* create the items for the extent tree */
241 memset(buf->data+sizeof(struct btrfs_header), 0,
242 leafsize-sizeof(struct btrfs_header));
244 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
245 for (i = 1; i < 7; i++) {
246 item_size = sizeof(struct btrfs_extent_item);
247 if (!skinny_metadata)
248 item_size += sizeof(struct btrfs_tree_block_info);
250 BUG_ON(blocks[i] < first_free);
251 BUG_ON(blocks[i] < blocks[i - 1]);
253 /* create extent item */
254 itemoff -= item_size;
255 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
256 if (skinny_metadata) {
257 btrfs_set_disk_key_type(&disk_key,
258 BTRFS_METADATA_ITEM_KEY);
259 btrfs_set_disk_key_offset(&disk_key, 0);
261 btrfs_set_disk_key_type(&disk_key,
262 BTRFS_EXTENT_ITEM_KEY);
263 btrfs_set_disk_key_offset(&disk_key, leafsize);
265 btrfs_set_item_key(buf, &disk_key, nritems);
266 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
268 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
270 extent_item = btrfs_item_ptr(buf, nritems,
271 struct btrfs_extent_item);
272 btrfs_set_extent_refs(buf, extent_item, 1);
273 btrfs_set_extent_generation(buf, extent_item, 1);
274 btrfs_set_extent_flags(buf, extent_item,
275 BTRFS_EXTENT_FLAG_TREE_BLOCK);
278 /* create extent ref */
279 ref_root = reference_root_table[i];
280 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
281 btrfs_set_disk_key_offset(&disk_key, ref_root);
282 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
283 btrfs_set_item_key(buf, &disk_key, nritems);
284 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
286 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
289 btrfs_set_header_bytenr(buf, blocks[2]);
290 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
291 btrfs_set_header_nritems(buf, nritems);
292 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
293 ret = pwrite(fd, buf->data, leafsize, blocks[2]);
294 if (ret != leafsize) {
295 ret = (ret < 0 ? -errno : -EIO);
299 /* create the chunk tree */
300 memset(buf->data+sizeof(struct btrfs_header), 0,
301 leafsize-sizeof(struct btrfs_header));
303 item_size = sizeof(*dev_item);
304 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
306 /* first device 1 (there is no device 0) */
307 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
308 btrfs_set_disk_key_offset(&disk_key, 1);
309 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
310 btrfs_set_item_key(buf, &disk_key, nritems);
311 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
312 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
314 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
315 btrfs_set_device_id(buf, dev_item, 1);
316 btrfs_set_device_generation(buf, dev_item, 0);
317 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
318 btrfs_set_device_bytes_used(buf, dev_item,
319 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
320 btrfs_set_device_io_align(buf, dev_item, sectorsize);
321 btrfs_set_device_io_width(buf, dev_item, sectorsize);
322 btrfs_set_device_sector_size(buf, dev_item, sectorsize);
323 btrfs_set_device_type(buf, dev_item, 0);
325 write_extent_buffer(buf, super.dev_item.uuid,
326 (unsigned long)btrfs_device_uuid(dev_item),
328 write_extent_buffer(buf, super.fsid,
329 (unsigned long)btrfs_device_fsid(dev_item),
331 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
335 item_size = btrfs_chunk_item_size(1);
336 itemoff = itemoff - item_size;
338 /* then we have chunk 0 */
339 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
340 btrfs_set_disk_key_offset(&disk_key, 0);
341 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
342 btrfs_set_item_key(buf, &disk_key, nritems);
343 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
344 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
346 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
347 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
348 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
349 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
350 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
351 btrfs_set_chunk_io_align(buf, chunk, sectorsize);
352 btrfs_set_chunk_io_width(buf, chunk, sectorsize);
353 btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
354 btrfs_set_chunk_num_stripes(buf, chunk, 1);
355 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
356 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
359 write_extent_buffer(buf, super.dev_item.uuid,
360 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
363 /* copy the key for the chunk to the system array */
364 ptr = super.sys_chunk_array;
365 array_size = sizeof(disk_key);
367 memcpy(ptr, &disk_key, sizeof(disk_key));
368 ptr += sizeof(disk_key);
370 /* copy the chunk to the system array */
371 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
372 array_size += item_size;
374 btrfs_set_super_sys_array_size(&super, array_size);
376 btrfs_set_header_bytenr(buf, blocks[3]);
377 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
378 btrfs_set_header_nritems(buf, nritems);
379 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
380 ret = pwrite(fd, buf->data, leafsize, blocks[3]);
381 if (ret != leafsize) {
382 ret = (ret < 0 ? -errno : -EIO);
386 /* create the device tree */
387 memset(buf->data+sizeof(struct btrfs_header), 0,
388 leafsize-sizeof(struct btrfs_header));
390 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
391 sizeof(struct btrfs_dev_extent);
393 btrfs_set_disk_key_objectid(&disk_key, 1);
394 btrfs_set_disk_key_offset(&disk_key, 0);
395 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
396 btrfs_set_item_key(buf, &disk_key, nritems);
397 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
398 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
399 sizeof(struct btrfs_dev_extent));
400 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
401 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
402 BTRFS_CHUNK_TREE_OBJECTID);
403 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
404 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
405 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
407 write_extent_buffer(buf, chunk_tree_uuid,
408 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
411 btrfs_set_dev_extent_length(buf, dev_extent,
412 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
415 btrfs_set_header_bytenr(buf, blocks[4]);
416 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
417 btrfs_set_header_nritems(buf, nritems);
418 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
419 ret = pwrite(fd, buf->data, leafsize, blocks[4]);
420 if (ret != leafsize) {
421 ret = (ret < 0 ? -errno : -EIO);
425 /* create the FS root */
426 memset(buf->data+sizeof(struct btrfs_header), 0,
427 leafsize-sizeof(struct btrfs_header));
428 btrfs_set_header_bytenr(buf, blocks[5]);
429 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
430 btrfs_set_header_nritems(buf, 0);
431 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
432 ret = pwrite(fd, buf->data, leafsize, blocks[5]);
433 if (ret != leafsize) {
434 ret = (ret < 0 ? -errno : -EIO);
437 /* finally create the csum root */
438 memset(buf->data+sizeof(struct btrfs_header), 0,
439 leafsize-sizeof(struct btrfs_header));
440 btrfs_set_header_bytenr(buf, blocks[6]);
441 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
442 btrfs_set_header_nritems(buf, 0);
443 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
444 ret = pwrite(fd, buf->data, leafsize, blocks[6]);
445 if (ret != leafsize) {
446 ret = (ret < 0 ? -errno : -EIO);
450 /* and write out the super block */
451 BUG_ON(sizeof(super) > sectorsize);
452 memset(buf->data, 0, sectorsize);
453 memcpy(buf->data, &super, sizeof(super));
454 buf->len = sectorsize;
455 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
456 ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
457 if (ret != sectorsize) {
458 ret = (ret < 0 ? -errno : -EIO);
469 u64 btrfs_device_size(int fd, struct stat *st)
472 if (S_ISREG(st->st_mode)) {
475 if (!S_ISBLK(st->st_mode)) {
478 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
484 static int zero_blocks(int fd, off_t start, size_t len)
486 char *buf = malloc(len);
493 written = pwrite(fd, buf, len, start);
500 static int zero_dev_start(int fd)
503 size_t len = 2 * 1024 * 1024;
506 /* don't overwrite the disk labels on sparc */
510 return zero_blocks(fd, start, len);
513 static int zero_dev_end(int fd, u64 dev_size)
515 size_t len = 2 * 1024 * 1024;
516 off_t start = dev_size - len;
518 return zero_blocks(fd, start, len);
521 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
522 struct btrfs_root *root, int fd, char *path,
523 u64 block_count, u32 io_width, u32 io_align,
526 struct btrfs_super_block *disk_super;
527 struct btrfs_super_block *super = root->fs_info->super_copy;
528 struct btrfs_device *device;
529 struct btrfs_dev_item *dev_item;
535 device = kzalloc(sizeof(*device), GFP_NOFS);
538 buf = kmalloc(sectorsize, GFP_NOFS);
543 BUG_ON(sizeof(*disk_super) > sectorsize);
544 memset(buf, 0, sectorsize);
546 disk_super = (struct btrfs_super_block *)buf;
547 dev_item = &disk_super->dev_item;
549 uuid_generate(device->uuid);
552 device->io_width = io_width;
553 device->io_align = io_align;
554 device->sector_size = sectorsize;
556 device->writeable = 1;
557 device->total_bytes = block_count;
558 device->bytes_used = 0;
559 device->total_ios = 0;
560 device->dev_root = root->fs_info->dev_root;
562 ret = btrfs_add_device(trans, root, device);
565 total_bytes = btrfs_super_total_bytes(super) + block_count;
566 btrfs_set_super_total_bytes(super, total_bytes);
568 num_devs = btrfs_super_num_devices(super) + 1;
569 btrfs_set_super_num_devices(super, num_devs);
571 memcpy(disk_super, super, sizeof(*disk_super));
573 printf("adding device %s id %llu\n", path,
574 (unsigned long long)device->devid);
576 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
577 btrfs_set_stack_device_id(dev_item, device->devid);
578 btrfs_set_stack_device_type(dev_item, device->type);
579 btrfs_set_stack_device_io_align(dev_item, device->io_align);
580 btrfs_set_stack_device_io_width(dev_item, device->io_width);
581 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
582 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
583 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
584 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
586 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
587 BUG_ON(ret != sectorsize);
590 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
591 device->fs_devices = root->fs_info->fs_devices;
595 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
596 u64 max_block_count, int *mixed, int discard)
603 ret = fstat(fd, &st);
605 fprintf(stderr, "unable to stat %s\n", file);
609 block_count = btrfs_device_size(fd, &st);
610 if (block_count == 0) {
611 fprintf(stderr, "unable to find %s size\n", file);
615 block_count = min(block_count, max_block_count);
618 if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
619 printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
625 * We intentionally ignore errors from the discard ioctl. It
626 * is not necessary for the mkfs functionality but just an
629 if (discard_range(fd, 0, 0) == 0) {
630 fprintf(stderr, "Performing full device TRIM (%s) ...\n",
631 pretty_size(block_count));
632 discard_blocks(fd, 0, block_count);
636 ret = zero_dev_start(fd);
640 for (i = 0 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
641 bytenr = btrfs_sb_offset(i);
642 if (bytenr >= block_count)
644 ret = zero_blocks(fd, bytenr, BTRFS_SUPER_INFO_SIZE);
650 ret = zero_dev_end(fd, block_count);
654 *block_count_ret = block_count;
658 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
659 file, strerror(-ret));
661 } else if (ret > 0) {
662 fprintf(stderr, "ERROR: failed to zero device '%s' - %d\n",
669 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
670 struct btrfs_root *root, u64 objectid)
673 struct btrfs_inode_item inode_item;
674 time_t now = time(NULL);
676 memset(&inode_item, 0, sizeof(inode_item));
677 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
678 btrfs_set_stack_inode_size(&inode_item, 0);
679 btrfs_set_stack_inode_nlink(&inode_item, 1);
680 btrfs_set_stack_inode_nbytes(&inode_item, root->leafsize);
681 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
682 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
683 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
684 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
685 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
686 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
687 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
688 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
689 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
691 if (root->fs_info->tree_root == root)
692 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
694 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
698 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
702 btrfs_set_root_dirid(&root->root_item, objectid);
709 * checks if a path is a block device node
710 * Returns negative errno on failure, otherwise
711 * returns 1 for blockdev, 0 for not-blockdev
713 int is_block_device(const char *path)
717 if (stat(path, &statbuf) < 0)
720 return S_ISBLK(statbuf.st_mode);
724 * check if given path is a mount point
725 * return 1 if yes. 0 if no. -1 for error
727 int is_mount_point(const char *path)
733 f = setmntent("/proc/self/mounts", "r");
737 while ((mnt = getmntent(f)) != NULL) {
738 if (strcmp(mnt->mnt_dir, path))
748 * Find the mount point for a mounted device.
749 * On success, returns 0 with mountpoint in *mp.
750 * On failure, returns -errno (not mounted yields -EINVAL)
751 * Is noisy on failures, expects to be given a mounted device.
753 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
758 ret = is_block_device(dev);
761 fprintf(stderr, "%s is not a block device\n", dev);
764 fprintf(stderr, "Could not check %s: %s\n",
765 dev, strerror(-ret));
770 fd = open(dev, O_RDONLY);
773 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
777 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
780 } else { /* mounted, all good */
790 * Given a pathname, return a filehandle to:
791 * the original pathname or,
792 * if the pathname is a mounted btrfs device, to its mountpoint.
794 * On error, return -1, errno should be set.
796 int open_path_or_dev_mnt(const char *path, DIR **dirstream)
798 char mp[BTRFS_PATH_NAME_MAX + 1];
801 if (is_block_device(path)) {
804 ret = get_btrfs_mount(path, mp, sizeof(mp));
806 /* not a mounted btrfs dev */
810 fdmnt = open_file_or_dir(mp, dirstream);
812 fdmnt = open_file_or_dir(path, dirstream);
818 /* checks if a device is a loop device */
819 static int is_loop_device (const char* device) {
822 if(stat(device, &statbuf) < 0)
825 return (S_ISBLK(statbuf.st_mode) &&
826 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
830 /* Takes a loop device path (e.g. /dev/loop0) and returns
831 * the associated file (e.g. /images/my_btrfs.img) */
832 static int resolve_loop_device(const char* loop_dev, char* loop_file,
839 char real_loop_dev[PATH_MAX];
841 if (!realpath(loop_dev, real_loop_dev))
843 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
844 if (!(f = fopen(p, "r")))
847 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
848 ret = fscanf(f, fmt, loop_file);
856 /* Checks whether a and b are identical or device
857 * files associated with the same block device
859 static int is_same_blk_file(const char* a, const char* b)
861 struct stat st_buf_a, st_buf_b;
862 char real_a[PATH_MAX];
863 char real_b[PATH_MAX];
865 if(!realpath(a, real_a))
868 if (!realpath(b, real_b))
871 /* Identical path? */
872 if(strcmp(real_a, real_b) == 0)
875 if(stat(a, &st_buf_a) < 0 ||
876 stat(b, &st_buf_b) < 0)
883 /* Same blockdevice? */
884 if(S_ISBLK(st_buf_a.st_mode) &&
885 S_ISBLK(st_buf_b.st_mode) &&
886 st_buf_a.st_rdev == st_buf_b.st_rdev)
892 if (st_buf_a.st_dev == st_buf_b.st_dev &&
893 st_buf_a.st_ino == st_buf_b.st_ino)
901 /* checks if a and b are identical or device
902 * files associated with the same block device or
903 * if one file is a loop device that uses the other
906 static int is_same_loop_file(const char* a, const char* b)
908 char res_a[PATH_MAX];
909 char res_b[PATH_MAX];
910 const char* final_a = NULL;
911 const char* final_b = NULL;
914 /* Resolve a if it is a loop device */
915 if((ret = is_loop_device(a)) < 0) {
920 ret = resolve_loop_device(a, res_a, sizeof(res_a));
931 /* Resolve b if it is a loop device */
932 if ((ret = is_loop_device(b)) < 0) {
937 ret = resolve_loop_device(b, res_b, sizeof(res_b));
948 return is_same_blk_file(final_a, final_b);
951 /* Checks if a file exists and is a block or regular file*/
952 static int is_existing_blk_or_reg_file(const char* filename)
956 if(stat(filename, &st_buf) < 0) {
963 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
966 /* Checks if a file is used (directly or indirectly via a loop device)
967 * by a device in fs_devices
969 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
973 struct list_head *head;
974 struct list_head *cur;
975 struct btrfs_device *device;
977 head = &fs_devices->devices;
978 list_for_each(cur, head) {
979 device = list_entry(cur, struct btrfs_device, dev_list);
981 if((ret = is_same_loop_file(device->name, file)))
989 * returns 1 if the device was mounted, < 0 on error or 0 if everything
990 * is safe to continue.
992 int check_mounted(const char* file)
997 fd = open(file, O_RDONLY);
999 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1003 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1009 int check_mounted_where(int fd, const char *file, char *where, int size,
1010 struct btrfs_fs_devices **fs_dev_ret)
1015 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1019 /* scan the initial device */
1020 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1021 &total_devs, BTRFS_SUPER_INFO_OFFSET);
1022 is_btrfs = (ret >= 0);
1024 /* scan other devices */
1025 if (is_btrfs && total_devs > 1) {
1026 if ((ret = btrfs_scan_for_fsid(!BTRFS_UPDATE_KERNEL)))
1030 /* iterate over the list of currently mountes filesystems */
1031 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1034 while ((mnt = getmntent (f)) != NULL) {
1036 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1039 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1041 /* ignore entries in the mount table that are not
1042 associated with a file*/
1043 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1044 goto out_mntloop_err;
1048 ret = is_same_loop_file(file, mnt->mnt_fsname);
1052 goto out_mntloop_err;
1057 /* Did we find an entry in mnt table? */
1058 if (mnt && size && where) {
1059 strncpy(where, mnt->mnt_dir, size);
1063 *fs_dev_ret = fs_devices_mnt;
1065 ret = (mnt != NULL);
1073 struct pending_dir {
1074 struct list_head list;
1075 char name[PATH_MAX];
1078 void btrfs_register_one_device(char *fname)
1080 struct btrfs_ioctl_vol_args args;
1085 fd = open("/dev/btrfs-control", O_RDONLY);
1087 fprintf(stderr, "failed to open /dev/btrfs-control "
1088 "skipping device registration: %s\n",
1092 strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
1093 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
1094 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1097 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1098 fname, strerror(e));
1103 int btrfs_scan_one_dir(char *dirname, int run_ioctl)
1106 struct dirent *dirent;
1107 struct pending_dir *pending;
1113 struct list_head pending_list;
1114 struct btrfs_fs_devices *tmp_devices;
1117 INIT_LIST_HEAD(&pending_list);
1119 pending = malloc(sizeof(*pending));
1122 strcpy(pending->name, dirname);
1125 dirname_len = strlen(pending->name);
1126 fullpath = malloc(PATH_MAX);
1127 dirname = pending->name;
1133 dirp = opendir(dirname);
1135 fprintf(stderr, "Unable to open %s for scanning\n", dirname);
1140 dirent = readdir(dirp);
1143 if (dirent->d_name[0] == '.')
1145 if (dirname_len + strlen(dirent->d_name) + 2 > PATH_MAX) {
1149 snprintf(fullpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
1150 ret = lstat(fullpath, &st);
1152 fprintf(stderr, "failed to stat %s\n", fullpath);
1155 if (S_ISLNK(st.st_mode))
1157 if (S_ISDIR(st.st_mode)) {
1158 struct pending_dir *next = malloc(sizeof(*next));
1163 strcpy(next->name, fullpath);
1164 list_add_tail(&next->list, &pending_list);
1166 if (!S_ISBLK(st.st_mode)) {
1169 fd = open(fullpath, O_RDONLY);
1171 /* ignore the following errors:
1172 ENXIO (device don't exists)
1173 ENOMEDIUM (No medium found ->
1174 like a cd tray empty)
1176 if(errno != ENXIO && errno != ENOMEDIUM)
1177 fprintf(stderr, "failed to read %s: %s\n",
1178 fullpath, strerror(errno));
1181 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1183 BTRFS_SUPER_INFO_OFFSET);
1184 if (ret == 0 && run_ioctl > 0) {
1185 btrfs_register_one_device(fullpath);
1189 if (!list_empty(&pending_list)) {
1191 pending = list_entry(pending_list.next, struct pending_dir,
1194 list_del(&pending->list);
1203 while (!list_empty(&pending_list)) {
1204 pending = list_entry(pending_list.next, struct pending_dir,
1206 list_del(&pending->list);
1214 int btrfs_scan_for_fsid(int run_ioctls)
1218 ret = scan_for_btrfs(BTRFS_SCAN_PROC, run_ioctls);
1220 ret = scan_for_btrfs(BTRFS_SCAN_DEV, run_ioctls);
1224 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1227 struct btrfs_super_block *disk_super;
1231 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1236 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1237 if (ret != BTRFS_SUPER_INFO_SIZE)
1241 disk_super = (struct btrfs_super_block *)buf;
1242 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1245 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1254 static char *size_strs[] = { "", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1255 int pretty_size_snprintf(u64 size, char *str, size_t str_bytes)
1267 u64 last_size = size;
1269 while(size >= 1024){
1275 if (num_divs >= ARRAY_SIZE(size_strs)) {
1279 fraction = (float)last_size / 1024;
1281 return snprintf(str, str_bytes, "%.2f%s", fraction,
1282 size_strs[num_divs]);
1286 * __strncpy__null - strncpy with null termination
1287 * @dest: the target array
1288 * @src: the source string
1289 * @n: maximum bytes to copy (size of *dest)
1291 * Like strncpy, but ensures destination is null-terminated.
1293 * Copies the string pointed to by src, including the terminating null
1294 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1295 * of n bytes. Then ensure that dest is null-terminated.
1297 char *__strncpy__null(char *dest, const char *src, size_t n)
1299 strncpy(dest, src, n);
1306 * Checks to make sure that the label matches our requirements.
1308 0 if everything is safe and usable
1309 -1 if the label is too long
1311 static int check_label(const char *input)
1313 int len = strlen(input);
1315 if (len > BTRFS_LABEL_SIZE - 1) {
1316 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1317 input, BTRFS_LABEL_SIZE - 1);
1324 static int set_label_unmounted(const char *dev, const char *label)
1326 struct btrfs_trans_handle *trans;
1327 struct btrfs_root *root;
1330 ret = check_mounted(dev);
1332 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1336 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1341 /* Open the super_block at the default location
1342 * and as read-write.
1344 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1345 if (!root) /* errors are printed by open_ctree() */
1348 trans = btrfs_start_transaction(root, 1);
1349 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1351 btrfs_commit_transaction(trans, root);
1353 /* Now we close it since we are done. */
1358 static int set_label_mounted(const char *mount_path, const char *label)
1362 fd = open(mount_path, O_RDONLY | O_NOATIME);
1364 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1368 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1369 fprintf(stderr, "ERROR: unable to set label %s\n",
1379 static int get_label_unmounted(const char *dev, char *label)
1381 struct btrfs_root *root;
1384 ret = check_mounted(dev);
1386 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1390 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1395 /* Open the super_block at the default location
1398 root = open_ctree(dev, 0, 0);
1402 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1404 /* Now we close it since we are done. */
1410 * If a partition is mounted, try to get the filesystem label via its
1411 * mounted path rather than device. Return the corresponding error
1412 * the user specified the device path.
1414 int get_label_mounted(const char *mount_path, char *labelp)
1416 char label[BTRFS_LABEL_SIZE];
1419 fd = open(mount_path, O_RDONLY | O_NOATIME);
1421 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1425 memset(label, '\0', sizeof(label));
1426 if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
1427 fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
1432 strncpy(labelp, label, sizeof(label));
1437 int get_label(const char *btrfs_dev, char *label)
1441 if (is_existing_blk_or_reg_file(btrfs_dev))
1442 ret = get_label_unmounted(btrfs_dev, label);
1444 ret = get_label_mounted(btrfs_dev, label);
1449 int set_label(const char *btrfs_dev, const char *label)
1451 if (check_label(label))
1454 return is_existing_blk_or_reg_file(btrfs_dev) ?
1455 set_label_unmounted(btrfs_dev, label) :
1456 set_label_mounted(btrfs_dev, label);
1459 int btrfs_scan_block_devices(int run_ioctl)
1465 struct btrfs_fs_devices *tmp_devices;
1467 FILE *proc_partitions;
1475 proc_partitions = fopen("/proc/partitions","r");
1476 if (!proc_partitions) {
1477 fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
1480 /* skip the header */
1481 for (i = 0; i < 2; i++)
1482 if (!fgets(buf, 1023, proc_partitions)) {
1484 "Unable to read '/proc/partitions' for scanning\n");
1485 fclose(proc_partitions);
1489 strcpy(fullpath,"/dev/");
1490 while(fgets(buf, 1023, proc_partitions)) {
1491 i = sscanf(buf," %*d %*d %*d %99s", fullpath+5);
1494 * multipath and MD devices may register as a btrfs filesystem
1495 * both through the original block device and through
1496 * the special (/dev/mapper or /dev/mdX) entry.
1497 * This scans the special entries last
1499 special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
1501 special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
1503 if (scans == 0 && special)
1505 if (scans > 0 && !special)
1508 ret = lstat(fullpath, &st);
1510 fprintf(stderr, "failed to stat %s\n", fullpath);
1513 if (!S_ISBLK(st.st_mode)) {
1517 fd = open(fullpath, O_RDONLY);
1519 if (errno != ENOMEDIUM)
1520 fprintf(stderr, "failed to open %s: %s\n",
1521 fullpath, strerror(errno));
1524 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1526 BTRFS_SUPER_INFO_OFFSET);
1527 if (ret == 0 && run_ioctl > 0) {
1528 btrfs_register_one_device(fullpath);
1533 fclose(proc_partitions);
1543 * This function should be only used when parsing
1544 * command arg, it won't return error to it's
1545 * caller and rather exit directly just like usage().
1547 u64 arg_strtou64(const char *str)
1550 char *ptr_parse_end = NULL;
1552 value = strtoull(str, &ptr_parse_end, 0);
1553 if (ptr_parse_end && *ptr_parse_end != '\0') {
1554 fprintf(stderr, "ERROR: %s is not a valid numeric value.\n",
1559 * if we pass a negative number to strtoull,
1560 * it will return an unexpected number to us,
1561 * so let's do the check ourselves.
1563 if (str[0] == '-') {
1564 fprintf(stderr, "ERROR: %s: negative value is invalid.\n",
1568 if (value == ULLONG_MAX) {
1569 fprintf(stderr, "ERROR: %s is too large.\n", str);
1575 u64 parse_size(char *s)
1581 for (i = 0; s && s[i] && isdigit(s[i]); i++) ;
1583 fprintf(stderr, "ERROR: size value is empty\n");
1611 fprintf(stderr, "ERROR: Unknown size descriptor "
1616 if (s[i] && s[i+1]) {
1617 fprintf(stderr, "ERROR: Illegal suffix contains "
1618 "character '%c' in wrong position\n",
1622 return strtoull(s, NULL, 10) * mult;
1625 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
1631 ret = stat(fname, &st);
1635 if (S_ISDIR(st.st_mode)) {
1636 *dirstream = opendir(fname);
1639 fd = dirfd(*dirstream);
1640 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
1641 fd = open(fname, open_flags);
1644 * we set this on purpose, in case the caller output
1645 * strerror(errno) as success
1653 closedir(*dirstream);
1658 int open_file_or_dir(const char *fname, DIR **dirstream)
1660 return open_file_or_dir3(fname, dirstream, O_RDWR);
1663 void close_file_or_dir(int fd, DIR *dirstream)
1666 closedir(dirstream);
1671 int get_device_info(int fd, u64 devid,
1672 struct btrfs_ioctl_dev_info_args *di_args)
1676 di_args->devid = devid;
1677 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
1679 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
1680 return ret ? -errno : 0;
1684 * For a given path, fill in the ioctl fs_ and info_ args.
1685 * If the path is a btrfs mountpoint, fill info for all devices.
1686 * If the path is a btrfs device, fill in only that device.
1688 * The path provided must be either on a mounted btrfs fs,
1689 * or be a mounted btrfs device.
1691 * Returns 0 on success, or a negative errno.
1693 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
1694 struct btrfs_ioctl_dev_info_args **di_ret)
1700 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1701 struct btrfs_ioctl_dev_info_args *di_args;
1702 char mp[BTRFS_PATH_NAME_MAX + 1];
1703 DIR *dirstream = NULL;
1705 memset(fi_args, 0, sizeof(*fi_args));
1707 if (is_block_device(path)) {
1708 struct btrfs_super_block *disk_super;
1709 char buf[BTRFS_SUPER_INFO_SIZE];
1712 /* Ensure it's mounted, then set path to the mountpoint */
1713 fd = open(path, O_RDONLY);
1716 fprintf(stderr, "Couldn't open %s: %s\n",
1717 path, strerror(errno));
1720 ret = check_mounted_where(fd, path, mp, sizeof(mp),
1729 /* Only fill in this one device */
1730 fi_args->num_devices = 1;
1732 disk_super = (struct btrfs_super_block *)buf;
1733 ret = btrfs_read_dev_super(fd, disk_super, BTRFS_SUPER_INFO_OFFSET);
1738 devid = btrfs_stack_device_id(&disk_super->dev_item);
1740 fi_args->max_id = devid;
1743 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
1747 /* at this point path must not be for a block device */
1748 fd = open_file_or_dir(path, &dirstream);
1754 /* fill in fi_args if not just a single device */
1755 if (fi_args->num_devices != 1) {
1756 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
1763 if (!fi_args->num_devices)
1766 di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
1772 for (; i <= fi_args->max_id; ++i) {
1773 BUG_ON(ndevs >= fi_args->num_devices);
1774 ret = get_device_info(fd, i, &di_args[ndevs]);
1783 * only when the only dev we wanted to find is not there then
1784 * let any error be returned
1786 if (fi_args->num_devices != 1) {
1792 close_file_or_dir(fd, dirstream);
1796 #define isoctal(c) (((c) & ~7) == '0')
1798 static inline void translate(char *f, char *t)
1800 while (*f != '\0') {
1802 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
1803 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
1813 * Checks if the swap device.
1814 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
1816 static int is_swap_device(const char *file)
1827 if (stat(file, &st_buf) < 0)
1829 if (S_ISBLK(st_buf.st_mode))
1830 dev = st_buf.st_rdev;
1831 else if (S_ISREG(st_buf.st_mode)) {
1832 dev = st_buf.st_dev;
1833 ino = st_buf.st_ino;
1837 if ((f = fopen("/proc/swaps", "r")) == NULL)
1840 /* skip the first line */
1841 if (fgets(tmp, sizeof(tmp), f) == NULL)
1844 while (fgets(tmp, sizeof(tmp), f) != NULL) {
1845 if ((cp = strchr(tmp, ' ')) != NULL)
1847 if ((cp = strchr(tmp, '\t')) != NULL)
1849 translate(tmp, buf);
1850 if (stat(buf, &st_buf) != 0)
1852 if (S_ISBLK(st_buf.st_mode)) {
1853 if (dev == st_buf.st_rdev) {
1857 } else if (S_ISREG(st_buf.st_mode)) {
1858 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
1872 * Check for existing filesystem or partition table on device.
1874 * 1 for existing fs or partition
1875 * 0 for nothing found
1876 * -1 for internal error
1883 blkid_probe pr = NULL;
1887 if (!device || !*device)
1890 ret = -1; /* will reset on success of all setup calls */
1892 pr = blkid_new_probe_from_filename(device);
1896 size = blkid_probe_get_size(pr);
1900 /* nothing to overwrite on a 0-length device */
1906 ret = blkid_probe_enable_partitions(pr, 1);
1910 ret = blkid_do_fullprobe(pr);
1915 * Blkid returns 1 for nothing found and 0 when it finds a signature,
1916 * but we want the exact opposite, so reverse the return value here.
1918 * In addition print some useful diagnostics about what actually is
1926 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
1928 "%s appears to contain an existing "
1929 "filesystem (%s).\n", device, type);
1930 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
1932 "%s appears to contain a partition "
1933 "table (%s).\n", device, type);
1936 "%s appears to contain something weird "
1937 "according to blkid\n", device);
1943 blkid_free_probe(pr);
1946 "probe of %s failed, cannot detect "
1947 "existing filesystem.\n", device);
1951 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
1952 u64 dev_cnt, int mixed, char *estr)
1960 allowed |= BTRFS_BLOCK_GROUP_RAID10;
1962 allowed |= BTRFS_BLOCK_GROUP_RAID6;
1964 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
1965 BTRFS_BLOCK_GROUP_RAID5;
1968 allowed |= BTRFS_BLOCK_GROUP_DUP;
1971 if (metadata_profile & ~allowed) {
1972 snprintf(estr, sz, "unable to create FS with metadata "
1973 "profile %llu (have %llu devices)\n",
1974 metadata_profile, dev_cnt);
1977 if (data_profile & ~allowed) {
1978 snprintf(estr, sz, "unable to create FS with data "
1979 "profile %llu (have %llu devices)\n",
1980 metadata_profile, dev_cnt);
1984 if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
1986 "dup for data is allowed only in mixed mode");
1992 /* Check if disk is suitable for btrfs
1994 * 1: something is wrong, estr provides the error
1997 int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
2003 ret = is_swap_device(file);
2005 snprintf(estr, sz, "error checking %s status: %s\n", file,
2010 snprintf(estr, sz, "%s is a swap device\n", file);
2013 if (!force_overwrite) {
2014 if (check_overwrite(file)) {
2015 snprintf(estr, sz, "Use the -f option to force overwrite.\n");
2019 ret = check_mounted(file);
2021 snprintf(estr, sz, "error checking %s mount status\n",
2026 snprintf(estr, sz, "%s is mounted\n", file);
2029 /* check if the device is busy */
2030 fd = open(file, O_RDWR|O_EXCL);
2032 snprintf(estr, sz, "unable to open %s: %s\n", file,
2036 if (fstat(fd, &st)) {
2037 snprintf(estr, sz, "unable to stat %s: %s\n", file,
2042 if (!S_ISBLK(st.st_mode)) {
2043 fprintf(stderr, "'%s' is not a block device\n", file);
2051 int btrfs_scan_lblkid(int update_kernel)
2056 struct btrfs_fs_devices *tmp_devices;
2057 blkid_dev_iterate iter = NULL;
2058 blkid_dev dev = NULL;
2059 blkid_cache cache = NULL;
2060 char path[PATH_MAX];
2062 if (blkid_get_cache(&cache, 0) < 0) {
2063 printf("ERROR: lblkid cache get failed\n");
2066 blkid_probe_all(cache);
2067 iter = blkid_dev_iterate_begin(cache);
2068 blkid_dev_set_search(iter, "TYPE", "btrfs");
2069 while (blkid_dev_next(iter, &dev) == 0) {
2070 dev = blkid_verify(cache, dev);
2073 /* if we are here its definitely a btrfs disk*/
2074 strncpy(path, blkid_dev_devname(dev), PATH_MAX);
2076 fd = open(path, O_RDONLY);
2078 printf("ERROR: could not open %s\n", path);
2081 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2082 &num_devices, BTRFS_SUPER_INFO_OFFSET);
2084 printf("ERROR: could not scan %s\n", path);
2091 btrfs_register_one_device(path);
2093 blkid_dev_iterate_end(iter);
2094 blkid_put_cache(cache);
2099 * scans devs for the btrfs
2101 int scan_for_btrfs(int where, int update_kernel)
2106 case BTRFS_SCAN_PROC:
2107 ret = btrfs_scan_block_devices(update_kernel);
2109 case BTRFS_SCAN_DEV:
2110 ret = btrfs_scan_one_dir("/dev", update_kernel);
2112 case BTRFS_SCAN_LBLKID:
2113 ret = btrfs_scan_lblkid(update_kernel);
2119 int is_vol_small(char *file)
2126 fd = open(file, O_RDONLY);
2129 if (fstat(fd, &st) < 0) {
2134 size = btrfs_device_size(fd, &st);
2139 if (size < 1024 * 1024 * 1024) {
2149 * This reads a line from the stdin and only returns non-zero if the
2150 * first whitespace delimited token is a case insensitive match with yes
2153 int ask_user(char *question)
2155 char buf[30] = {0,};
2156 char *saveptr = NULL;
2159 printf("%s [y/N]: ", question);
2161 return fgets(buf, sizeof(buf) - 1, stdin) &&
2162 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2163 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2168 * - file or directory return the containing tree root id
2169 * - subvolume return it's own tree id
2170 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2171 * undefined and function returns -1
2173 int lookup_ino_rootid(int fd, u64 *rootid)
2175 struct btrfs_ioctl_ino_lookup_args args;
2179 memset(&args, 0, sizeof(args));
2181 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2183 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2186 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2191 *rootid = args.treeid;
2196 int find_mount_root(const char *path, char **mount_root)
2203 int longest_matchlen = 0;
2204 char *longest_match = NULL;
2206 fd = open(path, O_RDONLY | O_NOATIME);
2211 mnttab = setmntent("/proc/self/mounts", "r");
2215 while ((ent = getmntent(mnttab))) {
2216 len = strlen(ent->mnt_dir);
2217 if (strncmp(ent->mnt_dir, path, len) == 0) {
2219 if (longest_matchlen < len) {
2220 free(longest_match);
2221 longest_matchlen = len;
2222 longest_match = strdup(ent->mnt_dir);
2228 if (!longest_match) {
2230 "ERROR: Failed to find mount root for path %s.\n",
2236 *mount_root = realpath(longest_match, NULL);
2240 free(longest_match);