2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #define _XOPEN_SOURCE 600
24 #include <sys/ioctl.h>
25 #include <sys/mount.h>
27 #include <sys/types.h>
29 #include <uuid/uuid.h>
34 #include "kerncompat.h"
35 #include "radix-tree.h"
38 #include "transaction.h"
45 #define BLKGETSIZE64 0
46 static inline int ioctl(int fd, int define, u64 *size) { return 0; }
49 static u64 reference_root_table[6] = {
50 [1] = BTRFS_ROOT_TREE_OBJECTID,
51 [2] = BTRFS_EXTENT_TREE_OBJECTID,
52 [3] = BTRFS_CHUNK_TREE_OBJECTID,
53 [4] = BTRFS_DEV_TREE_OBJECTID,
54 [5] = BTRFS_FS_TREE_OBJECTID,
57 int make_btrfs(int fd, const char *device, const char *label,
58 u64 blocks[6], u64 num_bytes, u32 nodesize,
59 u32 leafsize, u32 sectorsize, u32 stripesize)
61 struct btrfs_super_block super;
62 struct extent_buffer *buf;
63 struct btrfs_root_item root_item;
64 struct btrfs_disk_key disk_key;
65 struct btrfs_extent_ref *extent_ref;
66 struct btrfs_extent_item *extent_item;
67 struct btrfs_inode_item *inode_item;
68 struct btrfs_chunk *chunk;
69 struct btrfs_dev_item *dev_item;
70 struct btrfs_dev_extent *dev_extent;
71 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
84 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
85 first_free &= ~((u64)sectorsize - 1);
87 memset(&super, 0, sizeof(super));
89 num_bytes = (num_bytes / sectorsize) * sectorsize;
90 uuid_generate(super.fsid);
91 uuid_generate(super.dev_item.uuid);
92 uuid_generate(chunk_tree_uuid);
94 btrfs_set_super_bytenr(&super, blocks[0]);
95 btrfs_set_super_num_devices(&super, 1);
96 strncpy((char *)&super.magic, BTRFS_MAGIC, sizeof(super.magic));
97 btrfs_set_super_generation(&super, 1);
98 btrfs_set_super_root(&super, blocks[1]);
99 btrfs_set_super_chunk_root(&super, blocks[3]);
100 btrfs_set_super_total_bytes(&super, num_bytes);
101 btrfs_set_super_bytes_used(&super, first_free + 5 * leafsize);
102 btrfs_set_super_sectorsize(&super, sectorsize);
103 btrfs_set_super_leafsize(&super, leafsize);
104 btrfs_set_super_nodesize(&super, nodesize);
105 btrfs_set_super_stripesize(&super, stripesize);
107 strcpy(super.label, label);
109 buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
111 /* create the tree of root objects */
112 memset(buf->data, 0, leafsize);
114 btrfs_set_header_bytenr(buf, blocks[1]);
115 btrfs_set_header_nritems(buf, 3);
116 btrfs_set_header_generation(buf, 1);
117 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
118 write_extent_buffer(buf, super.fsid, (unsigned long)
119 btrfs_header_fsid(buf), BTRFS_FSID_SIZE);
121 write_extent_buffer(buf, chunk_tree_uuid, (unsigned long)
122 btrfs_header_chunk_tree_uuid(buf),
125 /* create the items for the root tree */
126 memset(&root_item, 0, sizeof(root_item));
127 inode_item = &root_item.inode;
128 btrfs_set_stack_inode_generation(inode_item, 1);
129 btrfs_set_stack_inode_size(inode_item, 3);
130 btrfs_set_stack_inode_nlink(inode_item, 1);
131 btrfs_set_stack_inode_nblocks(inode_item, 1);
132 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
133 btrfs_set_root_refs(&root_item, 1);
134 btrfs_set_root_used(&root_item, leafsize);
136 memset(&disk_key, 0, sizeof(disk_key));
137 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
138 btrfs_set_disk_key_offset(&disk_key, 0);
141 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
142 btrfs_set_root_bytenr(&root_item, blocks[2]);
143 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
144 btrfs_set_item_key(buf, &disk_key, nritems);
145 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
146 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
148 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
149 nritems), sizeof(root_item));
152 itemoff = itemoff - sizeof(root_item);
153 btrfs_set_root_bytenr(&root_item, blocks[4]);
154 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
155 btrfs_set_item_key(buf, &disk_key, nritems);
156 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
157 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
159 write_extent_buffer(buf, &root_item,
160 btrfs_item_ptr_offset(buf, nritems),
164 itemoff = itemoff - sizeof(root_item);
165 btrfs_set_root_bytenr(&root_item, blocks[5]);
166 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
167 btrfs_set_item_key(buf, &disk_key, nritems);
168 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
169 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
171 write_extent_buffer(buf, &root_item,
172 btrfs_item_ptr_offset(buf, nritems),
177 csum_tree_block(NULL, buf, 0);
178 ret = pwrite(fd, buf->data, leafsize, blocks[1]);
179 BUG_ON(ret != leafsize);
181 /* create the items for the extent tree */
183 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
184 sizeof(struct btrfs_extent_item);
185 btrfs_set_disk_key_objectid(&disk_key, 0);
186 btrfs_set_disk_key_offset(&disk_key, first_free);
187 btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
188 btrfs_set_item_key(buf, &disk_key, nritems);
189 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
190 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
191 sizeof(struct btrfs_extent_item));
192 extent_item = btrfs_item_ptr(buf, nritems, struct btrfs_extent_item);
193 btrfs_set_extent_refs(buf, extent_item, 1);
195 for (i = 1; i < 6; i++) {
196 BUG_ON(blocks[i] < first_free);
197 BUG_ON(blocks[i] < blocks[i - 1]);
199 /* create extent item */
200 itemoff = itemoff - sizeof(struct btrfs_extent_item);
201 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
202 btrfs_set_disk_key_offset(&disk_key, leafsize);
203 btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
204 btrfs_set_item_key(buf, &disk_key, nritems);
205 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
207 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
208 sizeof(struct btrfs_extent_item));
209 extent_item = btrfs_item_ptr(buf, nritems,
210 struct btrfs_extent_item);
211 btrfs_set_extent_refs(buf, extent_item, 1);
214 /* create extent ref */
215 ref_root = reference_root_table[i];
216 if (ref_root == BTRFS_FS_TREE_OBJECTID)
221 hash = btrfs_hash_extent_ref(ref_root, ref_gen, 0, 0);
222 itemoff = itemoff - sizeof(struct btrfs_extent_ref);
223 btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
224 btrfs_set_disk_key_offset(&disk_key, hash);
225 btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_REF_KEY);
226 btrfs_set_item_key(buf, &disk_key, nritems);
227 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
229 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
230 sizeof(struct btrfs_extent_ref));
231 extent_ref = btrfs_item_ptr(buf, nritems,
232 struct btrfs_extent_ref);
233 btrfs_set_ref_root(buf, extent_ref, ref_root);
234 btrfs_set_ref_generation(buf, extent_ref, ref_gen);
235 btrfs_set_ref_objectid(buf, extent_ref, 0);
236 btrfs_set_ref_offset(buf, extent_ref, 0);
239 btrfs_set_header_bytenr(buf, blocks[2]);
240 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
241 btrfs_set_header_nritems(buf, nritems);
242 csum_tree_block(NULL, buf, 0);
243 ret = pwrite(fd, buf->data, leafsize, blocks[2]);
244 BUG_ON(ret != leafsize);
246 /* create the chunk tree */
248 item_size = sizeof(*dev_item);
249 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
251 /* first device 1 (there is no device 0) */
252 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
253 btrfs_set_disk_key_offset(&disk_key, 1);
254 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
255 btrfs_set_item_key(buf, &disk_key, nritems);
256 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
257 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
259 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
260 btrfs_set_device_id(buf, dev_item, 1);
261 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
262 btrfs_set_device_bytes_used(buf, dev_item,
263 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
264 btrfs_set_device_io_align(buf, dev_item, sectorsize);
265 btrfs_set_device_io_width(buf, dev_item, sectorsize);
266 btrfs_set_device_sector_size(buf, dev_item, sectorsize);
267 btrfs_set_device_type(buf, dev_item, 0);
269 write_extent_buffer(buf, super.dev_item.uuid,
270 (unsigned long)btrfs_device_uuid(dev_item),
272 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
276 item_size = btrfs_chunk_item_size(1);
277 itemoff = itemoff - item_size;
279 /* then we have chunk 0 */
280 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
281 btrfs_set_disk_key_offset(&disk_key, 0);
282 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_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 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
288 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
289 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
290 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
291 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
292 btrfs_set_chunk_io_align(buf, chunk, sectorsize);
293 btrfs_set_chunk_io_width(buf, chunk, sectorsize);
294 btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
295 btrfs_set_chunk_num_stripes(buf, chunk, 1);
296 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
297 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
300 write_extent_buffer(buf, super.dev_item.uuid,
301 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
304 /* copy the key for the chunk to the system array */
305 ptr = super.sys_chunk_array;
306 array_size = sizeof(disk_key);
308 memcpy(ptr, &disk_key, sizeof(disk_key));
309 ptr += sizeof(disk_key);
311 /* copy the chunk to the system array */
312 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
313 array_size += item_size;
315 btrfs_set_super_sys_array_size(&super, array_size);
317 btrfs_set_header_bytenr(buf, blocks[3]);
318 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
319 btrfs_set_header_nritems(buf, nritems);
320 csum_tree_block(NULL, buf, 0);
321 ret = pwrite(fd, buf->data, leafsize, blocks[3]);
323 /* create the device tree */
325 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
326 sizeof(struct btrfs_dev_extent);
328 btrfs_set_disk_key_objectid(&disk_key, 1);
329 btrfs_set_disk_key_offset(&disk_key, 0);
330 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
331 btrfs_set_item_key(buf, &disk_key, nritems);
332 btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
333 btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
334 sizeof(struct btrfs_dev_extent));
335 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
336 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
337 BTRFS_CHUNK_TREE_OBJECTID);
338 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
339 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
340 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
342 write_extent_buffer(buf, chunk_tree_uuid,
343 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
346 btrfs_set_dev_extent_length(buf, dev_extent,
347 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
350 btrfs_set_header_bytenr(buf, blocks[4]);
351 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
352 btrfs_set_header_nritems(buf, nritems);
353 csum_tree_block(NULL, buf, 0);
354 ret = pwrite(fd, buf->data, leafsize, blocks[4]);
356 /* finally create the FS root */
357 btrfs_set_header_bytenr(buf, blocks[5]);
358 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
359 btrfs_set_header_nritems(buf, 0);
360 csum_tree_block(NULL, buf, 0);
361 ret = pwrite(fd, buf->data, leafsize, blocks[5]);
362 BUG_ON(ret != leafsize);
364 /* and write out the super block */
365 BUG_ON(sizeof(super) > sectorsize);
366 memset(buf->data, 0, sectorsize);
367 memcpy(buf->data, &super, sizeof(super));
368 buf->len = sectorsize;
369 csum_tree_block(NULL, buf, 0);
370 ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
371 BUG_ON(ret != sectorsize);
378 static u64 device_size(int fd, struct stat *st)
381 if (S_ISREG(st->st_mode)) {
384 if (!S_ISBLK(st->st_mode)) {
387 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
393 static int zero_blocks(int fd, off_t start, size_t len)
395 char *buf = malloc(len);
402 written = pwrite(fd, buf, len, start);
409 static int zero_dev_start(int fd)
412 size_t len = 2 * 1024 * 1024;
415 /* don't overwrite the disk labels on sparc */
419 return zero_blocks(fd, start, len);
422 static int zero_dev_end(int fd, u64 dev_size)
424 size_t len = 2 * 1024 * 1024;
425 off_t start = dev_size - len;
427 return zero_blocks(fd, start, len);
430 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
431 struct btrfs_root *root, int fd, char *path,
432 u64 block_count, u32 io_width, u32 io_align,
435 struct btrfs_super_block *disk_super;
436 struct btrfs_super_block *super = &root->fs_info->super_copy;
437 struct btrfs_device *device;
438 struct btrfs_dev_item *dev_item;
444 device = kmalloc(sizeof(*device), GFP_NOFS);
447 buf = kmalloc(sectorsize, GFP_NOFS);
452 BUG_ON(sizeof(*disk_super) > sectorsize);
453 memset(buf, 0, sectorsize);
455 disk_super = (struct btrfs_super_block *)buf;
456 dev_item = &disk_super->dev_item;
458 uuid_generate(device->uuid);
461 device->io_width = io_width;
462 device->io_align = io_align;
463 device->sector_size = sectorsize;
465 device->total_bytes = block_count;
466 device->bytes_used = 0;
467 device->total_ios = 0;
468 device->dev_root = root->fs_info->dev_root;
470 ret = btrfs_add_device(trans, root, device);
473 total_bytes = btrfs_super_total_bytes(super) + block_count;
474 btrfs_set_super_total_bytes(super, total_bytes);
476 num_devs = btrfs_super_num_devices(super) + 1;
477 btrfs_set_super_num_devices(super, num_devs);
479 memcpy(disk_super, super, sizeof(*disk_super));
481 printf("adding device %s id %llu\n", path,
482 (unsigned long long)device->devid);
484 btrfs_set_stack_device_id(dev_item, device->devid);
485 btrfs_set_stack_device_type(dev_item, device->type);
486 btrfs_set_stack_device_io_align(dev_item, device->io_align);
487 btrfs_set_stack_device_io_width(dev_item, device->io_width);
488 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
489 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
490 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
491 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
493 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
494 BUG_ON(ret != sectorsize);
497 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
498 ret = btrfs_bootstrap_super_map(&root->fs_info->mapping_tree,
499 root->fs_info->fs_devices);
504 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret)
510 ret = fstat(fd, &st);
512 fprintf(stderr, "unable to stat %s\n", file);
516 block_count = device_size(fd, &st);
517 if (block_count == 0) {
518 fprintf(stderr, "unable to find %s size\n", file);
523 if (block_count < 256 * 1024 * 1024) {
524 fprintf(stderr, "device %s is too small\n", file);
527 ret = zero_dev_start(fd);
529 fprintf(stderr, "failed to zero device start %d\n", ret);
534 ret = zero_dev_end(fd, block_count);
536 fprintf(stderr, "failed to zero device end %d\n", ret);
540 *block_count_ret = block_count;
544 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
545 struct btrfs_root *root, u64 objectid)
548 struct btrfs_inode_item inode_item;
550 memset(&inode_item, 0, sizeof(inode_item));
551 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
552 btrfs_set_stack_inode_size(&inode_item, 0);
553 btrfs_set_stack_inode_nlink(&inode_item, 1);
554 btrfs_set_stack_inode_nblocks(&inode_item, 1);
555 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0555);
557 if (root->fs_info->tree_root == root)
558 btrfs_set_super_root_dir(&root->fs_info->super_copy, objectid);
560 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
564 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid);
568 btrfs_set_root_dirid(&root->root_item, objectid);
575 * returns 1 if the device was mounted, < 0 on error or 0 if everything
576 * is safe to continue. TODO, this should also scan multi-device filesystems
578 int check_mounted(char *file)
588 if ((f = setmntent ("/proc/mounts", "r")) == NULL)
591 if (stat(file, &st_buf) < 0) {
594 if (S_ISBLK(st_buf.st_mode)) {
595 file_rdev = st_buf.st_rdev;
597 file_dev = st_buf.st_dev;
598 file_ino = st_buf.st_ino;
602 while ((mnt = getmntent (f)) != NULL) {
603 if (strcmp(file, mnt->mnt_fsname) == 0)
606 if (stat(mnt->mnt_fsname, &st_buf) == 0) {
607 if (S_ISBLK(st_buf.st_mode)) {
608 if (file_rdev && (file_rdev == st_buf.st_rdev))
610 } else if (file_dev && ((file_dev == st_buf.st_dev) &&
611 (file_ino == st_buf.st_ino))) {
618 /* found an entry in mnt table */
627 struct list_head list;
631 int btrfs_register_one_device(char *fname)
633 struct btrfs_ioctl_vol_args args;
637 fd = open("/dev/btrfs-control", O_RDONLY);
640 strcpy(args.name, fname);
641 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
646 int btrfs_scan_one_dir(char *dirname, int run_ioctl)
649 struct dirent *dirent;
650 struct pending_dir *pending;
657 struct list_head pending_list;
658 struct btrfs_fs_devices *tmp_devices;
661 INIT_LIST_HEAD(&pending_list);
663 pending = malloc(sizeof(*pending));
666 strcpy(pending->name, dirname);
669 dirname_len = strlen(pending->name);
671 fullpath = malloc(pathlen);
672 dirname = pending->name;
678 dirp = opendir(dirname);
680 fprintf(stderr, "Unable to open /sys/block for scanning\n");
684 dirent = readdir(dirp);
687 if (dirent->d_name[0] == '.')
689 if (dirname_len + strlen(dirent->d_name) + 2 > pathlen) {
693 snprintf(fullpath, pathlen, "%s/%s", dirname, dirent->d_name);
694 ret = lstat(fullpath, &st);
696 fprintf(stderr, "failed to stat %s\n", fullpath);
699 if (S_ISLNK(st.st_mode))
701 if (S_ISDIR(st.st_mode)) {
702 struct pending_dir *next = malloc(sizeof(*next));
707 strcpy(next->name, fullpath);
708 list_add_tail(&next->list, &pending_list);
710 if (!S_ISBLK(st.st_mode)) {
713 fd = open(fullpath, O_RDONLY);
715 fprintf(stderr, "failed to read %s\n", fullpath);
718 ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
720 BTRFS_SUPER_INFO_OFFSET);
721 if (ret == 0 && run_ioctl > 0) {
722 btrfs_register_one_device(fullpath);
726 if (!list_empty(&pending_list)) {
728 pending = list_entry(pending_list.next, struct pending_dir,
730 list_del(&pending->list);
742 int btrfs_scan_for_fsid(struct btrfs_fs_devices *fs_devices, u64 total_devs,
745 return btrfs_scan_one_dir("/dev", run_ioctls);
748 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
751 struct btrfs_super_block *disk_super;
755 buf = malloc(BTRFS_SUPER_INFO_SIZE);
760 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
761 if (ret != BTRFS_SUPER_INFO_SIZE)
765 disk_super = (struct btrfs_super_block *)buf;
766 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
767 sizeof(disk_super->magic)))
770 if (!memcmp(disk_super->fsid, root->fs_info->super_copy.fsid,
779 static char *size_strs[] = { "", "KB", "MB", "GB", "TB",
780 "PB", "EB", "ZB", "YB"};
781 char *pretty_sizes(u64 size)
784 u64 last_size = size;
785 u64 fract_size = size;
790 fract_size = last_size;
797 if (num_divs > ARRAY_SIZE(size_strs))
800 fraction = (float)fract_size / 1024;
802 sprintf(pretty, "%.2f%s", fraction, size_strs[num_divs-1]);