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 */
28 #include <sys/ioctl.h>
29 #include <sys/mount.h>
31 #include <sys/types.h>
33 #include <uuid/uuid.h>
38 #include <linux/loop.h>
39 #include <linux/major.h>
40 #include <linux/kdev_t.h>
42 #include <blkid/blkid.h>
43 #include "kerncompat.h"
44 #include "radix-tree.h"
47 #include "transaction.h"
54 #define BLKGETSIZE64 0
55 static inline int ioctl(int fd, int define, u64 *size) { return 0; }
59 #define BLKDISCARD _IO(0x12,119)
63 discard_blocks(int fd, u64 start, u64 len)
65 u64 range[2] = { start, len };
67 if (ioctl(fd, BLKDISCARD, &range) < 0)
72 static u64 reference_root_table[] = {
73 [1] = BTRFS_ROOT_TREE_OBJECTID,
74 [2] = BTRFS_EXTENT_TREE_OBJECTID,
75 [3] = BTRFS_CHUNK_TREE_OBJECTID,
76 [4] = BTRFS_DEV_TREE_OBJECTID,
77 [5] = BTRFS_FS_TREE_OBJECTID,
78 [6] = BTRFS_CSUM_TREE_OBJECTID,
81 int make_btrfs(int fd, const char *device, const char *label,
82 u64 blocks[7], u64 num_bytes, u32 nodesize,
83 u32 leafsize, u32 sectorsize, u32 stripesize)
85 struct btrfs_super_block super;
86 struct extent_buffer *buf;
87 struct btrfs_root_item root_item;
88 struct btrfs_disk_key disk_key;
89 struct btrfs_extent_item *extent_item;
90 struct btrfs_inode_item *inode_item;
91 struct btrfs_chunk *chunk;
92 struct btrfs_dev_item *dev_item;
93 struct btrfs_dev_extent *dev_extent;
94 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
105 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
106 first_free &= ~((u64)sectorsize - 1);
108 memset(&super, 0, sizeof(super));
110 num_bytes = (num_bytes / sectorsize) * sectorsize;
111 uuid_generate(super.fsid);
112 uuid_generate(super.dev_item.uuid);
113 uuid_generate(chunk_tree_uuid);
115 btrfs_set_super_bytenr(&super, blocks[0]);
116 btrfs_set_super_num_devices(&super, 1);
117 btrfs_set_super_magic(&super, BTRFS_MAGIC);
118 btrfs_set_super_generation(&super, 1);
119 btrfs_set_super_root(&super, blocks[1]);
120 btrfs_set_super_chunk_root(&super, blocks[3]);
121 btrfs_set_super_total_bytes(&super, num_bytes);
122 btrfs_set_super_bytes_used(&super, 6 * leafsize);
123 btrfs_set_super_sectorsize(&super, sectorsize);
124 btrfs_set_super_leafsize(&super, leafsize);
125 btrfs_set_super_nodesize(&super, nodesize);
126 btrfs_set_super_stripesize(&super, stripesize);
127 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
128 btrfs_set_super_chunk_root_generation(&super, 1);
129 btrfs_set_super_cache_generation(&super, -1);
131 strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
133 buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
135 /* create the tree of root objects */
136 memset(buf->data, 0, leafsize);
138 btrfs_set_header_bytenr(buf, blocks[1]);
139 btrfs_set_header_nritems(buf, 4);
140 btrfs_set_header_generation(buf, 1);
141 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
142 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
143 write_extent_buffer(buf, super.fsid, (unsigned long)
144 btrfs_header_fsid(buf), BTRFS_FSID_SIZE);
146 write_extent_buffer(buf, chunk_tree_uuid, (unsigned long)
147 btrfs_header_chunk_tree_uuid(buf),
150 /* create the items for the root tree */
151 memset(&root_item, 0, sizeof(root_item));
152 inode_item = &root_item.inode;
153 btrfs_set_stack_inode_generation(inode_item, 1);
154 btrfs_set_stack_inode_size(inode_item, 3);
155 btrfs_set_stack_inode_nlink(inode_item, 1);
156 btrfs_set_stack_inode_nbytes(inode_item, leafsize);
157 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
158 btrfs_set_root_refs(&root_item, 1);
159 btrfs_set_root_used(&root_item, leafsize);
160 btrfs_set_root_generation(&root_item, 1);
162 memset(&disk_key, 0, sizeof(disk_key));
163 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
164 btrfs_set_disk_key_offset(&disk_key, 0);
167 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
168 btrfs_set_root_bytenr(&root_item, blocks[2]);
169 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
170 btrfs_set_item_key(buf, &disk_key, nritems);
171 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
172 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
174 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
175 nritems), sizeof(root_item));
178 itemoff = itemoff - sizeof(root_item);
179 btrfs_set_root_bytenr(&root_item, blocks[4]);
180 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
181 btrfs_set_item_key(buf, &disk_key, nritems);
182 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
183 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
185 write_extent_buffer(buf, &root_item,
186 btrfs_item_ptr_offset(buf, nritems),
190 itemoff = itemoff - sizeof(root_item);
191 btrfs_set_root_bytenr(&root_item, blocks[5]);
192 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
193 btrfs_set_item_key(buf, &disk_key, nritems);
194 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
195 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
197 write_extent_buffer(buf, &root_item,
198 btrfs_item_ptr_offset(buf, nritems),
202 itemoff = itemoff - sizeof(root_item);
203 btrfs_set_root_bytenr(&root_item, blocks[6]);
204 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
205 btrfs_set_item_key(buf, &disk_key, nritems);
206 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
207 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
209 write_extent_buffer(buf, &root_item,
210 btrfs_item_ptr_offset(buf, nritems),
215 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
216 ret = pwrite(fd, buf->data, leafsize, blocks[1]);
219 else if (ret != leafsize)
222 /* create the items for the extent tree */
223 memset(buf->data+sizeof(struct btrfs_header), 0,
224 leafsize-sizeof(struct btrfs_header));
226 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
227 for (i = 1; i < 7; i++) {
228 BUG_ON(blocks[i] < first_free);
229 BUG_ON(blocks[i] < blocks[i - 1]);
231 /* create extent item */
232 itemoff -= sizeof(struct btrfs_extent_item) +
233 sizeof(struct btrfs_tree_block_info);
234 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
235 btrfs_set_disk_key_offset(&disk_key, leafsize);
236 btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
237 btrfs_set_item_key(buf, &disk_key, nritems);
238 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
240 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
241 sizeof(struct btrfs_extent_item) +
242 sizeof(struct btrfs_tree_block_info));
243 extent_item = btrfs_item_ptr(buf, nritems,
244 struct btrfs_extent_item);
245 btrfs_set_extent_refs(buf, extent_item, 1);
246 btrfs_set_extent_generation(buf, extent_item, 1);
247 btrfs_set_extent_flags(buf, extent_item,
248 BTRFS_EXTENT_FLAG_TREE_BLOCK);
251 /* create extent ref */
252 ref_root = reference_root_table[i];
253 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
254 btrfs_set_disk_key_offset(&disk_key, ref_root);
255 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
256 btrfs_set_item_key(buf, &disk_key, nritems);
257 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
259 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), 0);
262 btrfs_set_header_bytenr(buf, blocks[2]);
263 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
264 btrfs_set_header_nritems(buf, nritems);
265 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
266 ret = pwrite(fd, buf->data, leafsize, blocks[2]);
269 else if (ret != leafsize)
272 /* create the chunk tree */
273 memset(buf->data+sizeof(struct btrfs_header), 0,
274 leafsize-sizeof(struct btrfs_header));
276 item_size = sizeof(*dev_item);
277 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
279 /* first device 1 (there is no device 0) */
280 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
281 btrfs_set_disk_key_offset(&disk_key, 1);
282 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
283 btrfs_set_item_key(buf, &disk_key, nritems);
284 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
285 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
287 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
288 btrfs_set_device_id(buf, dev_item, 1);
289 btrfs_set_device_generation(buf, dev_item, 0);
290 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
291 btrfs_set_device_bytes_used(buf, dev_item,
292 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
293 btrfs_set_device_io_align(buf, dev_item, sectorsize);
294 btrfs_set_device_io_width(buf, dev_item, sectorsize);
295 btrfs_set_device_sector_size(buf, dev_item, sectorsize);
296 btrfs_set_device_type(buf, dev_item, 0);
298 write_extent_buffer(buf, super.dev_item.uuid,
299 (unsigned long)btrfs_device_uuid(dev_item),
301 write_extent_buffer(buf, super.fsid,
302 (unsigned long)btrfs_device_fsid(dev_item),
304 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
308 item_size = btrfs_chunk_item_size(1);
309 itemoff = itemoff - item_size;
311 /* then we have chunk 0 */
312 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
313 btrfs_set_disk_key_offset(&disk_key, 0);
314 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
315 btrfs_set_item_key(buf, &disk_key, nritems);
316 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
317 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
319 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
320 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
321 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
322 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
323 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
324 btrfs_set_chunk_io_align(buf, chunk, sectorsize);
325 btrfs_set_chunk_io_width(buf, chunk, sectorsize);
326 btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
327 btrfs_set_chunk_num_stripes(buf, chunk, 1);
328 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
329 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
332 write_extent_buffer(buf, super.dev_item.uuid,
333 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
336 /* copy the key for the chunk to the system array */
337 ptr = super.sys_chunk_array;
338 array_size = sizeof(disk_key);
340 memcpy(ptr, &disk_key, sizeof(disk_key));
341 ptr += sizeof(disk_key);
343 /* copy the chunk to the system array */
344 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
345 array_size += item_size;
347 btrfs_set_super_sys_array_size(&super, array_size);
349 btrfs_set_header_bytenr(buf, blocks[3]);
350 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
351 btrfs_set_header_nritems(buf, nritems);
352 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
353 ret = pwrite(fd, buf->data, leafsize, blocks[3]);
356 else if (ret != leafsize)
359 /* create the device tree */
360 memset(buf->data+sizeof(struct btrfs_header), 0,
361 leafsize-sizeof(struct btrfs_header));
363 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
364 sizeof(struct btrfs_dev_extent);
366 btrfs_set_disk_key_objectid(&disk_key, 1);
367 btrfs_set_disk_key_offset(&disk_key, 0);
368 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
369 btrfs_set_item_key(buf, &disk_key, nritems);
370 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
371 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
372 sizeof(struct btrfs_dev_extent));
373 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
374 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
375 BTRFS_CHUNK_TREE_OBJECTID);
376 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
377 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
378 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
380 write_extent_buffer(buf, chunk_tree_uuid,
381 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
384 btrfs_set_dev_extent_length(buf, dev_extent,
385 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
388 btrfs_set_header_bytenr(buf, blocks[4]);
389 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
390 btrfs_set_header_nritems(buf, nritems);
391 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
392 ret = pwrite(fd, buf->data, leafsize, blocks[4]);
395 else if (ret != leafsize)
398 /* create the FS root */
399 memset(buf->data+sizeof(struct btrfs_header), 0,
400 leafsize-sizeof(struct btrfs_header));
401 btrfs_set_header_bytenr(buf, blocks[5]);
402 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
403 btrfs_set_header_nritems(buf, 0);
404 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
405 ret = pwrite(fd, buf->data, leafsize, blocks[5]);
408 else if (ret != leafsize)
411 /* finally create the csum root */
412 memset(buf->data+sizeof(struct btrfs_header), 0,
413 leafsize-sizeof(struct btrfs_header));
414 btrfs_set_header_bytenr(buf, blocks[6]);
415 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
416 btrfs_set_header_nritems(buf, 0);
417 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
418 ret = pwrite(fd, buf->data, leafsize, blocks[6]);
421 else if (ret != leafsize)
424 /* and write out the super block */
425 BUG_ON(sizeof(super) > sectorsize);
426 memset(buf->data, 0, sectorsize);
427 memcpy(buf->data, &super, sizeof(super));
428 buf->len = sectorsize;
429 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
430 ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
433 else if (ret != leafsize)
440 u64 btrfs_device_size(int fd, struct stat *st)
443 if (S_ISREG(st->st_mode)) {
446 if (!S_ISBLK(st->st_mode)) {
449 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
455 static int zero_blocks(int fd, off_t start, size_t len)
457 char *buf = malloc(len);
464 written = pwrite(fd, buf, len, start);
471 static int zero_dev_start(int fd)
474 size_t len = 2 * 1024 * 1024;
477 /* don't overwrite the disk labels on sparc */
481 return zero_blocks(fd, start, len);
484 static int zero_dev_end(int fd, u64 dev_size)
486 size_t len = 2 * 1024 * 1024;
487 off_t start = dev_size - len;
489 return zero_blocks(fd, start, len);
492 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
493 struct btrfs_root *root, int fd, char *path,
494 u64 block_count, u32 io_width, u32 io_align,
497 struct btrfs_super_block *disk_super;
498 struct btrfs_super_block *super = root->fs_info->super_copy;
499 struct btrfs_device *device;
500 struct btrfs_dev_item *dev_item;
506 device = kzalloc(sizeof(*device), GFP_NOFS);
509 buf = kmalloc(sectorsize, GFP_NOFS);
514 BUG_ON(sizeof(*disk_super) > sectorsize);
515 memset(buf, 0, sectorsize);
517 disk_super = (struct btrfs_super_block *)buf;
518 dev_item = &disk_super->dev_item;
520 uuid_generate(device->uuid);
523 device->io_width = io_width;
524 device->io_align = io_align;
525 device->sector_size = sectorsize;
527 device->writeable = 1;
528 device->total_bytes = block_count;
529 device->bytes_used = 0;
530 device->total_ios = 0;
531 device->dev_root = root->fs_info->dev_root;
533 ret = btrfs_add_device(trans, root, device);
536 total_bytes = btrfs_super_total_bytes(super) + block_count;
537 btrfs_set_super_total_bytes(super, total_bytes);
539 num_devs = btrfs_super_num_devices(super) + 1;
540 btrfs_set_super_num_devices(super, num_devs);
542 memcpy(disk_super, super, sizeof(*disk_super));
544 printf("adding device %s id %llu\n", path,
545 (unsigned long long)device->devid);
547 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
548 btrfs_set_stack_device_id(dev_item, device->devid);
549 btrfs_set_stack_device_type(dev_item, device->type);
550 btrfs_set_stack_device_io_align(dev_item, device->io_align);
551 btrfs_set_stack_device_io_width(dev_item, device->io_width);
552 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
553 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
554 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
555 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
557 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
558 BUG_ON(ret != sectorsize);
561 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
562 device->fs_devices = root->fs_info->fs_devices;
566 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
567 u64 max_block_count, int *mixed, int nodiscard)
574 ret = fstat(fd, &st);
576 fprintf(stderr, "unable to stat %s\n", file);
580 block_count = btrfs_device_size(fd, &st);
581 if (block_count == 0) {
582 fprintf(stderr, "unable to find %s size\n", file);
586 block_count = min(block_count, max_block_count);
589 if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
590 printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
596 * We intentionally ignore errors from the discard ioctl. It is
597 * not necessary for the mkfs functionality but just an optimization.
599 discard_blocks(fd, 0, block_count);
602 ret = zero_dev_start(fd);
604 fprintf(stderr, "failed to zero device start %d\n", ret);
608 for (i = 0 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
609 bytenr = btrfs_sb_offset(i);
610 if (bytenr >= block_count)
612 zero_blocks(fd, bytenr, BTRFS_SUPER_INFO_SIZE);
616 ret = zero_dev_end(fd, block_count);
618 fprintf(stderr, "failed to zero device end %d\n", ret);
622 *block_count_ret = block_count;
626 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
627 struct btrfs_root *root, u64 objectid)
630 struct btrfs_inode_item inode_item;
631 time_t now = time(NULL);
633 memset(&inode_item, 0, sizeof(inode_item));
634 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
635 btrfs_set_stack_inode_size(&inode_item, 0);
636 btrfs_set_stack_inode_nlink(&inode_item, 1);
637 btrfs_set_stack_inode_nbytes(&inode_item, root->leafsize);
638 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
639 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
640 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
641 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
642 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
643 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
644 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
645 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
646 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
648 if (root->fs_info->tree_root == root)
649 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
651 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
655 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
659 btrfs_set_root_dirid(&root->root_item, objectid);
666 * checks if a path is a block device node
667 * Returns negative errno on failure, otherwise
668 * returns 1 for blockdev, 0 for not-blockdev
670 int is_block_device(const char *path) {
673 if (stat(path, &statbuf) < 0)
676 return S_ISBLK(statbuf.st_mode);
680 * Find the mount point for a mounted device.
681 * On success, returns 0 with mountpoint in *mp.
682 * On failure, returns -errno (not mounted yields -EINVAL)
683 * Is noisy on failures, expects to be given a mounted device.
685 static int get_btrfs_mount(const char *dev, char *mp, size_t mp_size) {
689 ret = is_block_device(dev);
692 fprintf(stderr, "%s is not a block device\n", dev);
695 fprintf(stderr, "Could not check %s: %s\n",
696 dev, strerror(-ret));
701 fd = open(dev, O_RDONLY);
704 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
708 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
710 fprintf(stderr, "%s is not a mounted btrfs device\n", dev);
712 } else { /* mounted, all good */
719 fprintf(stderr, "Could not get mountpoint for %s\n", dev);
724 * Given a pathname, return a filehandle to:
725 * the original pathname or,
726 * if the pathname is a mounted btrfs device, to its mountpoint.
728 * On error, return -1, errno should be set.
730 int open_path_or_dev_mnt(const char *path, DIR **dirstream)
732 char mp[BTRFS_PATH_NAME_MAX + 1];
735 if (is_block_device(path)) {
738 ret = get_btrfs_mount(path, mp, sizeof(mp));
740 /* not a mounted btrfs dev */
744 fdmnt = open_file_or_dir(mp, dirstream);
746 fdmnt = open_file_or_dir(path, dirstream);
752 /* checks if a device is a loop device */
753 int is_loop_device (const char* device) {
756 if(stat(device, &statbuf) < 0)
759 return (S_ISBLK(statbuf.st_mode) &&
760 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
764 /* Takes a loop device path (e.g. /dev/loop0) and returns
765 * the associated file (e.g. /images/my_btrfs.img) */
766 int resolve_loop_device(const char* loop_dev, char* loop_file, int max_len)
772 char real_loop_dev[PATH_MAX];
774 if (!realpath(loop_dev, real_loop_dev))
776 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
777 if (!(f = fopen(p, "r")))
780 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
781 ret = fscanf(f, fmt, loop_file);
789 /* Checks whether a and b are identical or device
790 * files associated with the same block device
792 int is_same_blk_file(const char* a, const char* b)
794 struct stat st_buf_a, st_buf_b;
795 char real_a[PATH_MAX];
796 char real_b[PATH_MAX];
798 if(!realpath(a, real_a) ||
799 !realpath(b, real_b))
804 /* Identical path? */
805 if(strcmp(real_a, real_b) == 0)
808 if(stat(a, &st_buf_a) < 0 ||
809 stat(b, &st_buf_b) < 0)
816 /* Same blockdevice? */
817 if(S_ISBLK(st_buf_a.st_mode) &&
818 S_ISBLK(st_buf_b.st_mode) &&
819 st_buf_a.st_rdev == st_buf_b.st_rdev)
825 if (st_buf_a.st_dev == st_buf_b.st_dev &&
826 st_buf_a.st_ino == st_buf_b.st_ino)
834 /* checks if a and b are identical or device
835 * files associated with the same block device or
836 * if one file is a loop device that uses the other
839 int is_same_loop_file(const char* a, const char* b)
841 char res_a[PATH_MAX];
842 char res_b[PATH_MAX];
847 /* Resolve a if it is a loop device */
848 if((ret = is_loop_device(a)) < 0) {
853 if ((ret = resolve_loop_device(a, res_a, sizeof(res_a))) < 0)
861 /* Resolve b if it is a loop device */
862 if ((ret = is_loop_device(b)) < 0) {
867 if((ret = resolve_loop_device(b, res_b, sizeof(res_b))) < 0)
875 return is_same_blk_file(final_a, final_b);
878 /* Checks if a file exists and is a block or regular file*/
879 int is_existing_blk_or_reg_file(const char* filename)
883 if(stat(filename, &st_buf) < 0) {
890 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
893 /* Checks if a file is used (directly or indirectly via a loop device)
894 * by a device in fs_devices
896 int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices, const char* file)
899 struct list_head *head;
900 struct list_head *cur;
901 struct btrfs_device *device;
903 head = &fs_devices->devices;
904 list_for_each(cur, head) {
905 device = list_entry(cur, struct btrfs_device, dev_list);
907 if((ret = is_same_loop_file(device->name, file)))
915 * returns 1 if the device was mounted, < 0 on error or 0 if everything
916 * is safe to continue.
918 int check_mounted(const char* file)
923 fd = open(file, O_RDONLY);
925 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
929 ret = check_mounted_where(fd, file, NULL, 0, NULL);
935 int check_mounted_where(int fd, const char *file, char *where, int size,
936 struct btrfs_fs_devices **fs_dev_ret)
941 struct btrfs_fs_devices *fs_devices_mnt = NULL;
945 /* scan the initial device */
946 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
947 &total_devs, BTRFS_SUPER_INFO_OFFSET);
948 is_btrfs = (ret >= 0);
950 /* scan other devices */
951 if (is_btrfs && total_devs > 1) {
952 if((ret = btrfs_scan_for_fsid(1)))
956 /* iterate over the list of currently mountes filesystems */
957 if ((f = setmntent ("/proc/mounts", "r")) == NULL)
960 while ((mnt = getmntent (f)) != NULL) {
962 if(strcmp(mnt->mnt_type, "btrfs") != 0)
965 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
967 /* ignore entries in the mount table that are not
968 associated with a file*/
969 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
970 goto out_mntloop_err;
974 ret = is_same_loop_file(file, mnt->mnt_fsname);
978 goto out_mntloop_err;
983 /* Did we find an entry in mnt table? */
984 if (mnt && size && where) {
985 strncpy(where, mnt->mnt_dir, size);
989 *fs_dev_ret = fs_devices_mnt;
1000 struct list_head list;
1001 char name[PATH_MAX];
1004 void btrfs_register_one_device(char *fname)
1006 struct btrfs_ioctl_vol_args args;
1011 fd = open("/dev/btrfs-control", O_RDONLY);
1013 fprintf(stderr, "failed to open /dev/btrfs-control "
1014 "skipping device registration: %s\n",
1018 strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
1019 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
1020 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1023 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1024 fname, strerror(e));
1029 int btrfs_scan_one_dir(char *dirname, int run_ioctl)
1032 struct dirent *dirent;
1033 struct pending_dir *pending;
1039 struct list_head pending_list;
1040 struct btrfs_fs_devices *tmp_devices;
1043 INIT_LIST_HEAD(&pending_list);
1045 pending = malloc(sizeof(*pending));
1048 strcpy(pending->name, dirname);
1051 dirname_len = strlen(pending->name);
1052 fullpath = malloc(PATH_MAX);
1053 dirname = pending->name;
1059 dirp = opendir(dirname);
1061 fprintf(stderr, "Unable to open %s for scanning\n", dirname);
1066 dirent = readdir(dirp);
1069 if (dirent->d_name[0] == '.')
1071 if (dirname_len + strlen(dirent->d_name) + 2 > PATH_MAX) {
1075 snprintf(fullpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
1076 ret = lstat(fullpath, &st);
1078 fprintf(stderr, "failed to stat %s\n", fullpath);
1081 if (S_ISLNK(st.st_mode))
1083 if (S_ISDIR(st.st_mode)) {
1084 struct pending_dir *next = malloc(sizeof(*next));
1089 strcpy(next->name, fullpath);
1090 list_add_tail(&next->list, &pending_list);
1092 if (!S_ISBLK(st.st_mode)) {
1095 fd = open(fullpath, O_RDONLY);
1097 /* ignore the following errors:
1098 ENXIO (device don't exists)
1099 ENOMEDIUM (No medium found ->
1100 like a cd tray empty)
1102 if(errno != ENXIO && errno != ENOMEDIUM)
1103 fprintf(stderr, "failed to read %s: %s\n",
1104 fullpath, strerror(errno));
1107 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1109 BTRFS_SUPER_INFO_OFFSET);
1110 if (ret == 0 && run_ioctl > 0) {
1111 btrfs_register_one_device(fullpath);
1115 if (!list_empty(&pending_list)) {
1117 pending = list_entry(pending_list.next, struct pending_dir,
1120 list_del(&pending->list);
1134 int btrfs_scan_for_fsid(int run_ioctls)
1138 ret = scan_for_btrfs(BTRFS_SCAN_PROC, run_ioctls);
1140 ret = scan_for_btrfs(BTRFS_SCAN_DEV, run_ioctls);
1144 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1147 struct btrfs_super_block *disk_super;
1151 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1156 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1157 if (ret != BTRFS_SUPER_INFO_SIZE)
1161 disk_super = (struct btrfs_super_block *)buf;
1162 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1165 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1174 static char *size_strs[] = { "", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1175 void pretty_size_snprintf(u64 size, char *str, size_t str_bytes)
1187 u64 last_size = size;
1189 while(size >= 1024){
1195 if (num_divs >= ARRAY_SIZE(size_strs)) {
1199 fraction = (float)last_size / 1024;
1201 snprintf(str, str_bytes, "%.2f%s", fraction, size_strs[num_divs]);
1205 * __strncpy__null - strncpy with null termination
1206 * @dest: the target array
1207 * @src: the source string
1208 * @n: maximum bytes to copy (size of *dest)
1210 * Like strncpy, but ensures destination is null-terminated.
1212 * Copies the string pointed to by src, including the terminating null
1213 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1214 * of n bytes. Then ensure that dest is null-terminated.
1216 char *__strncpy__null(char *dest, const char *src, size_t n)
1218 strncpy(dest, src, n);
1225 * Checks to make sure that the label matches our requirements.
1227 0 if everything is safe and usable
1228 -1 if the label is too long
1230 static int check_label(const char *input)
1232 int len = strlen(input);
1234 if (len > BTRFS_LABEL_SIZE - 1) {
1235 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1236 input, BTRFS_LABEL_SIZE - 1);
1243 static int set_label_unmounted(const char *dev, const char *label)
1245 struct btrfs_trans_handle *trans;
1246 struct btrfs_root *root;
1249 ret = check_mounted(dev);
1251 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1255 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1260 /* Open the super_block at the default location
1261 * and as read-write.
1263 root = open_ctree(dev, 0, 1);
1264 if (!root) /* errors are printed by open_ctree() */
1267 trans = btrfs_start_transaction(root, 1);
1268 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1270 btrfs_commit_transaction(trans, root);
1272 /* Now we close it since we are done. */
1277 static int set_label_mounted(const char *mount_path, const char *label)
1281 fd = open(mount_path, O_RDONLY | O_NOATIME);
1283 fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
1287 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1288 fprintf(stderr, "ERROR: unable to set label %s\n",
1298 static int get_label_unmounted(const char *dev)
1300 struct btrfs_root *root;
1303 ret = check_mounted(dev);
1305 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1309 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1314 /* Open the super_block at the default location
1317 root = open_ctree(dev, 0, 0);
1321 fprintf(stdout, "%s\n", root->fs_info->super_copy->label);
1323 /* Now we close it since we are done. */
1329 * If a partition is mounted, try to get the filesystem label via its
1330 * mounted path rather than device. Return the corresponding error
1331 * the user specified the device path.
1333 int get_label_mounted(const char *mount_path, char *labelp)
1335 char label[BTRFS_LABEL_SIZE];
1338 fd = open(mount_path, O_RDONLY | O_NOATIME);
1340 fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
1344 memset(label, '\0', sizeof(label));
1345 if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
1346 fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
1351 strncpy(labelp, label, sizeof(label));
1356 int get_label(const char *btrfs_dev)
1359 char label[BTRFS_LABEL_SIZE];
1361 if (is_existing_blk_or_reg_file(btrfs_dev))
1362 ret = get_label_unmounted(btrfs_dev);
1364 ret = get_label_mounted(btrfs_dev, label);
1366 fprintf(stdout, "%s\n", label);
1371 int set_label(const char *btrfs_dev, const char *label)
1373 if (check_label(label))
1376 return is_existing_blk_or_reg_file(btrfs_dev) ?
1377 set_label_unmounted(btrfs_dev, label) :
1378 set_label_mounted(btrfs_dev, label);
1381 int btrfs_scan_block_devices(int run_ioctl)
1387 struct btrfs_fs_devices *tmp_devices;
1389 FILE *proc_partitions;
1397 proc_partitions = fopen("/proc/partitions","r");
1398 if (!proc_partitions) {
1399 fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
1402 /* skip the header */
1403 for (i = 0; i < 2; i++)
1404 if (!fgets(buf, 1023, proc_partitions)) {
1406 "Unable to read '/proc/partitions' for scanning\n");
1407 fclose(proc_partitions);
1411 strcpy(fullpath,"/dev/");
1412 while(fgets(buf, 1023, proc_partitions)) {
1413 i = sscanf(buf," %*d %*d %*d %99s", fullpath+5);
1416 * multipath and MD devices may register as a btrfs filesystem
1417 * both through the original block device and through
1418 * the special (/dev/mapper or /dev/mdX) entry.
1419 * This scans the special entries last
1421 special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
1423 special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
1425 if (scans == 0 && special)
1427 if (scans > 0 && !special)
1430 ret = lstat(fullpath, &st);
1432 fprintf(stderr, "failed to stat %s\n", fullpath);
1435 if (!S_ISBLK(st.st_mode)) {
1439 fd = open(fullpath, O_RDONLY);
1441 if (errno != ENOMEDIUM)
1442 fprintf(stderr, "failed to open %s: %s\n",
1443 fullpath, strerror(errno));
1446 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
1448 BTRFS_SUPER_INFO_OFFSET);
1449 if (ret == 0 && run_ioctl > 0) {
1450 btrfs_register_one_device(fullpath);
1455 fclose(proc_partitions);
1464 u64 parse_size(char *s)
1470 for (i = 0; s && s[i] && isdigit(s[i]); i++) ;
1472 fprintf(stderr, "ERROR: size value is empty\n");
1494 fprintf(stderr, "ERROR: Unknown size descriptor "
1499 if (s[i] && s[i+1]) {
1500 fprintf(stderr, "ERROR: Illegal suffix contains "
1501 "character '%c' in wrong position\n",
1505 return strtoull(s, NULL, 10) * mult;
1508 int open_file_or_dir(const char *fname, DIR **dirstream)
1514 ret = stat(fname, &st);
1518 if (S_ISDIR(st.st_mode)) {
1519 *dirstream = opendir(fname);
1522 fd = dirfd(*dirstream);
1524 fd = open(fname, O_RDWR);
1529 closedir(*dirstream);
1534 void close_file_or_dir(int fd, DIR *dirstream)
1537 closedir(dirstream);
1542 int get_device_info(int fd, u64 devid,
1543 struct btrfs_ioctl_dev_info_args *di_args)
1547 di_args->devid = devid;
1548 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
1550 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
1551 return ret ? -errno : 0;
1555 * For a given path, fill in the ioctl fs_ and info_ args.
1556 * If the path is a btrfs mountpoint, fill info for all devices.
1557 * If the path is a btrfs device, fill in only that device.
1559 * The path provided must be either on a mounted btrfs fs,
1560 * or be a mounted btrfs device.
1562 * Returns 0 on success, or a negative errno.
1564 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
1565 struct btrfs_ioctl_dev_info_args **di_ret)
1571 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1572 struct btrfs_ioctl_dev_info_args *di_args;
1573 char mp[BTRFS_PATH_NAME_MAX + 1];
1574 DIR *dirstream = NULL;
1576 memset(fi_args, 0, sizeof(*fi_args));
1578 if (is_block_device(path)) {
1579 /* Ensure it's mounted, then set path to the mountpoint */
1580 fd = open(path, O_RDONLY);
1583 fprintf(stderr, "Couldn't open %s: %s\n",
1584 path, strerror(errno));
1587 ret = check_mounted_where(fd, path, mp, sizeof(mp),
1596 /* Only fill in this one device */
1597 fi_args->num_devices = 1;
1598 fi_args->max_id = fs_devices_mnt->latest_devid;
1599 i = fs_devices_mnt->latest_devid;
1600 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
1604 /* at this point path must not be for a block device */
1605 fd = open_file_or_dir(path, &dirstream);
1611 /* fill in fi_args if not just a single device */
1612 if (fi_args->num_devices != 1) {
1613 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
1620 if (!fi_args->num_devices)
1623 di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
1629 for (; i <= fi_args->max_id; ++i) {
1630 BUG_ON(ndevs >= fi_args->num_devices);
1631 ret = get_device_info(fd, i, &di_args[ndevs]);
1642 close_file_or_dir(fd, dirstream);
1646 #define isoctal(c) (((c) & ~7) == '0')
1648 static inline void translate(char *f, char *t)
1650 while (*f != '\0') {
1652 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
1653 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
1663 * Checks if the swap device.
1664 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
1666 int is_swap_device(const char *file)
1677 if (stat(file, &st_buf) < 0)
1679 if (S_ISBLK(st_buf.st_mode))
1680 dev = st_buf.st_rdev;
1681 else if (S_ISREG(st_buf.st_mode)) {
1682 dev = st_buf.st_dev;
1683 ino = st_buf.st_ino;
1687 if ((f = fopen("/proc/swaps", "r")) == NULL)
1690 /* skip the first line */
1691 if (fgets(tmp, sizeof(tmp), f) == NULL)
1694 while (fgets(tmp, sizeof(tmp), f) != NULL) {
1695 if ((cp = strchr(tmp, ' ')) != NULL)
1697 if ((cp = strchr(tmp, '\t')) != NULL)
1699 translate(tmp, buf);
1700 if (stat(buf, &st_buf) != 0)
1702 if (S_ISBLK(st_buf.st_mode)) {
1703 if (dev == st_buf.st_rdev) {
1707 } else if (S_ISREG(st_buf.st_mode)) {
1708 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
1722 * Check for existing filesystem or partition table on device.
1724 * 1 for existing fs or partition
1725 * 0 for nothing found
1726 * -1 for internal error
1733 blkid_probe pr = NULL;
1737 if (!device || !*device)
1740 ret = -1; /* will reset on success of all setup calls */
1742 pr = blkid_new_probe_from_filename(device);
1746 size = blkid_probe_get_size(pr);
1750 /* nothing to overwrite on a 0-length device */
1756 ret = blkid_probe_enable_partitions(pr, 1);
1760 ret = blkid_do_fullprobe(pr);
1765 * Blkid returns 1 for nothing found and 0 when it finds a signature,
1766 * but we want the exact opposite, so reverse the return value here.
1768 * In addition print some useful diagnostics about what actually is
1776 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
1778 "%s appears to contain an existing "
1779 "filesystem (%s).\n", device, type);
1780 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
1782 "%s appears to contain a partition "
1783 "table (%s).\n", device, type);
1786 "%s appears to contain something weird "
1787 "according to blkid\n", device);
1793 blkid_free_probe(pr);
1796 "probe of %s failed, cannot detect "
1797 "existing filesystem.\n", device);
1801 /* Check if disk is suitable for btrfs
1803 * 1: something is wrong, estr provides the error
1806 int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
1812 ret = is_swap_device(file);
1814 snprintf(estr, sz, "error checking %s status: %s\n", file,
1819 snprintf(estr, sz, "%s is a swap device\n", file);
1822 if (!force_overwrite) {
1823 if (check_overwrite(file)) {
1824 snprintf(estr, sz, "Use the -f option to force overwrite.\n");
1828 ret = check_mounted(file);
1830 snprintf(estr, sz, "error checking %s mount status\n",
1835 snprintf(estr, sz, "%s is mounted\n", file);
1838 /* check if the device is busy */
1839 fd = open(file, O_RDWR|O_EXCL);
1841 snprintf(estr, sz, "unable to open %s: %s\n", file,
1845 if (fstat(fd, &st)) {
1846 snprintf(estr, sz, "unable to stat %s: %s\n", file,
1850 if (!S_ISBLK(st.st_mode)) {
1851 fprintf(stderr, "'%s' is not a block device\n", file);
1859 * scans devs for the btrfs
1861 int scan_for_btrfs(int where, int update_kernel)
1866 case BTRFS_SCAN_PROC:
1867 ret = btrfs_scan_block_devices(update_kernel);
1869 case BTRFS_SCAN_DEV:
1870 ret = btrfs_scan_one_dir("/dev", update_kernel);