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
[] = {
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
,
55 [6] = BTRFS_CSUM_TREE_OBJECTID
,
58 int make_btrfs(int fd
, const char *device
, const char *label
,
59 u64 blocks
[7], u64 num_bytes
, u32 nodesize
,
60 u32 leafsize
, u32 sectorsize
, u32 stripesize
)
62 struct btrfs_super_block super
;
63 struct extent_buffer
*buf
;
64 struct btrfs_root_item root_item
;
65 struct btrfs_disk_key disk_key
;
66 struct btrfs_extent_ref
*extent_ref
;
67 struct btrfs_extent_item
*extent_item
;
68 struct btrfs_inode_item
*inode_item
;
69 struct btrfs_chunk
*chunk
;
70 struct btrfs_dev_item
*dev_item
;
71 struct btrfs_dev_extent
*dev_extent
;
72 u8 chunk_tree_uuid
[BTRFS_UUID_SIZE
];
83 first_free
= BTRFS_SUPER_INFO_OFFSET
+ sectorsize
* 2 - 1;
84 first_free
&= ~((u64
)sectorsize
- 1);
86 memset(&super
, 0, sizeof(super
));
88 num_bytes
= (num_bytes
/ sectorsize
) * sectorsize
;
89 uuid_generate(super
.fsid
);
90 uuid_generate(super
.dev_item
.uuid
);
91 uuid_generate(chunk_tree_uuid
);
93 btrfs_set_super_bytenr(&super
, blocks
[0]);
94 btrfs_set_super_num_devices(&super
, 1);
95 strncpy((char *)&super
.magic
, BTRFS_MAGIC
, sizeof(super
.magic
));
96 btrfs_set_super_generation(&super
, 1);
97 btrfs_set_super_root(&super
, blocks
[1]);
98 btrfs_set_super_chunk_root(&super
, blocks
[3]);
99 btrfs_set_super_total_bytes(&super
, num_bytes
);
100 btrfs_set_super_bytes_used(&super
, 6 * leafsize
);
101 btrfs_set_super_sectorsize(&super
, sectorsize
);
102 btrfs_set_super_leafsize(&super
, leafsize
);
103 btrfs_set_super_nodesize(&super
, nodesize
);
104 btrfs_set_super_stripesize(&super
, stripesize
);
105 btrfs_set_super_csum_type(&super
, BTRFS_CSUM_TYPE_CRC32
);
106 btrfs_set_super_chunk_root_generation(&super
, 1);
108 strcpy(super
.label
, label
);
110 buf
= malloc(sizeof(*buf
) + max(sectorsize
, leafsize
));
112 /* create the tree of root objects */
113 memset(buf
->data
, 0, leafsize
);
115 btrfs_set_header_bytenr(buf
, blocks
[1]);
116 btrfs_set_header_nritems(buf
, 4);
117 btrfs_set_header_generation(buf
, 1);
118 btrfs_set_header_owner(buf
, BTRFS_ROOT_TREE_OBJECTID
);
119 write_extent_buffer(buf
, super
.fsid
, (unsigned long)
120 btrfs_header_fsid(buf
), BTRFS_FSID_SIZE
);
122 write_extent_buffer(buf
, chunk_tree_uuid
, (unsigned long)
123 btrfs_header_chunk_tree_uuid(buf
),
126 /* create the items for the root tree */
127 memset(&root_item
, 0, sizeof(root_item
));
128 inode_item
= &root_item
.inode
;
129 btrfs_set_stack_inode_generation(inode_item
, 1);
130 btrfs_set_stack_inode_size(inode_item
, 3);
131 btrfs_set_stack_inode_nlink(inode_item
, 1);
132 btrfs_set_stack_inode_nbytes(inode_item
, leafsize
);
133 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
134 btrfs_set_root_refs(&root_item
, 1);
135 btrfs_set_root_used(&root_item
, leafsize
);
136 btrfs_set_root_generation(&root_item
, 1);
138 memset(&disk_key
, 0, sizeof(disk_key
));
139 btrfs_set_disk_key_type(&disk_key
, BTRFS_ROOT_ITEM_KEY
);
140 btrfs_set_disk_key_offset(&disk_key
, 0);
143 itemoff
= __BTRFS_LEAF_DATA_SIZE(leafsize
) - sizeof(root_item
);
144 btrfs_set_root_bytenr(&root_item
, blocks
[2]);
145 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_EXTENT_TREE_OBJECTID
);
146 btrfs_set_item_key(buf
, &disk_key
, nritems
);
147 btrfs_set_item_offset(buf
, btrfs_item_nr(buf
, nritems
), itemoff
);
148 btrfs_set_item_size(buf
, btrfs_item_nr(buf
, nritems
),
150 write_extent_buffer(buf
, &root_item
, btrfs_item_ptr_offset(buf
,
151 nritems
), sizeof(root_item
));
154 itemoff
= itemoff
- sizeof(root_item
);
155 btrfs_set_root_bytenr(&root_item
, blocks
[4]);
156 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_DEV_TREE_OBJECTID
);
157 btrfs_set_item_key(buf
, &disk_key
, nritems
);
158 btrfs_set_item_offset(buf
, btrfs_item_nr(buf
, nritems
), itemoff
);
159 btrfs_set_item_size(buf
, btrfs_item_nr(buf
, nritems
),
161 write_extent_buffer(buf
, &root_item
,
162 btrfs_item_ptr_offset(buf
, nritems
),
166 itemoff
= itemoff
- sizeof(root_item
);
167 btrfs_set_root_bytenr(&root_item
, blocks
[5]);
168 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_FS_TREE_OBJECTID
);
169 btrfs_set_item_key(buf
, &disk_key
, nritems
);
170 btrfs_set_item_offset(buf
, btrfs_item_nr(buf
, nritems
), itemoff
);
171 btrfs_set_item_size(buf
, btrfs_item_nr(buf
, nritems
),
173 write_extent_buffer(buf
, &root_item
,
174 btrfs_item_ptr_offset(buf
, nritems
),
178 itemoff
= itemoff
- sizeof(root_item
);
179 btrfs_set_root_bytenr(&root_item
, blocks
[6]);
180 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_CSUM_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
),
191 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
192 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[1]);
193 BUG_ON(ret
!= leafsize
);
195 /* create the items for the extent tree */
197 itemoff
= __BTRFS_LEAF_DATA_SIZE(leafsize
);
198 for (i
= 1; i
< 7; i
++) {
199 BUG_ON(blocks
[i
] < first_free
);
200 BUG_ON(blocks
[i
] < blocks
[i
- 1]);
202 /* create extent item */
203 itemoff
= itemoff
- sizeof(struct btrfs_extent_item
);
204 btrfs_set_disk_key_objectid(&disk_key
, blocks
[i
]);
205 btrfs_set_disk_key_offset(&disk_key
, leafsize
);
206 btrfs_set_disk_key_type(&disk_key
, BTRFS_EXTENT_ITEM_KEY
);
207 btrfs_set_item_key(buf
, &disk_key
, nritems
);
208 btrfs_set_item_offset(buf
, btrfs_item_nr(buf
, nritems
),
210 btrfs_set_item_size(buf
, btrfs_item_nr(buf
, nritems
),
211 sizeof(struct btrfs_extent_item
));
212 extent_item
= btrfs_item_ptr(buf
, nritems
,
213 struct btrfs_extent_item
);
214 btrfs_set_extent_refs(buf
, extent_item
, 1);
217 /* create extent ref */
218 ref_root
= reference_root_table
[i
];
219 itemoff
= itemoff
- sizeof(struct btrfs_extent_ref
);
220 btrfs_set_disk_key_objectid(&disk_key
, blocks
[i
]);
221 btrfs_set_disk_key_offset(&disk_key
, blocks
[i
]);
222 btrfs_set_disk_key_type(&disk_key
, BTRFS_EXTENT_REF_KEY
);
223 btrfs_set_item_key(buf
, &disk_key
, nritems
);
224 btrfs_set_item_offset(buf
, btrfs_item_nr(buf
, nritems
),
226 btrfs_set_item_size(buf
, btrfs_item_nr(buf
, nritems
),
227 sizeof(struct btrfs_extent_ref
));
228 extent_ref
= btrfs_item_ptr(buf
, nritems
,
229 struct btrfs_extent_ref
);
230 btrfs_set_ref_root(buf
, extent_ref
, ref_root
);
231 btrfs_set_ref_generation(buf
, extent_ref
, 1);
232 btrfs_set_ref_objectid(buf
, extent_ref
, 0);
233 btrfs_set_ref_num_refs(buf
, extent_ref
, 1);
236 btrfs_set_header_bytenr(buf
, blocks
[2]);
237 btrfs_set_header_owner(buf
, BTRFS_EXTENT_TREE_OBJECTID
);
238 btrfs_set_header_nritems(buf
, nritems
);
239 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
240 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[2]);
241 BUG_ON(ret
!= leafsize
);
243 /* create the chunk tree */
245 item_size
= sizeof(*dev_item
);
246 itemoff
= __BTRFS_LEAF_DATA_SIZE(leafsize
) - item_size
;
248 /* first device 1 (there is no device 0) */
249 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_DEV_ITEMS_OBJECTID
);
250 btrfs_set_disk_key_offset(&disk_key
, 1);
251 btrfs_set_disk_key_type(&disk_key
, BTRFS_DEV_ITEM_KEY
);
252 btrfs_set_item_key(buf
, &disk_key
, nritems
);
253 btrfs_set_item_offset(buf
, btrfs_item_nr(buf
, nritems
), itemoff
);
254 btrfs_set_item_size(buf
, btrfs_item_nr(buf
, nritems
), item_size
);
256 dev_item
= btrfs_item_ptr(buf
, nritems
, struct btrfs_dev_item
);
257 btrfs_set_device_id(buf
, dev_item
, 1);
258 btrfs_set_device_generation(buf
, dev_item
, 0);
259 btrfs_set_device_total_bytes(buf
, dev_item
, num_bytes
);
260 btrfs_set_device_bytes_used(buf
, dev_item
,
261 BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
262 btrfs_set_device_io_align(buf
, dev_item
, sectorsize
);
263 btrfs_set_device_io_width(buf
, dev_item
, sectorsize
);
264 btrfs_set_device_sector_size(buf
, dev_item
, sectorsize
);
265 btrfs_set_device_type(buf
, dev_item
, 0);
267 write_extent_buffer(buf
, super
.dev_item
.uuid
,
268 (unsigned long)btrfs_device_uuid(dev_item
),
270 write_extent_buffer(buf
, super
.fsid
,
271 (unsigned long)btrfs_device_fsid(dev_item
),
273 read_extent_buffer(buf
, &super
.dev_item
, (unsigned long)dev_item
,
277 item_size
= btrfs_chunk_item_size(1);
278 itemoff
= itemoff
- item_size
;
280 /* then we have chunk 0 */
281 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_FIRST_CHUNK_TREE_OBJECTID
);
282 btrfs_set_disk_key_offset(&disk_key
, 0);
283 btrfs_set_disk_key_type(&disk_key
, BTRFS_CHUNK_ITEM_KEY
);
284 btrfs_set_item_key(buf
, &disk_key
, nritems
);
285 btrfs_set_item_offset(buf
, btrfs_item_nr(buf
, nritems
), itemoff
);
286 btrfs_set_item_size(buf
, btrfs_item_nr(buf
, nritems
), item_size
);
288 chunk
= btrfs_item_ptr(buf
, nritems
, struct btrfs_chunk
);
289 btrfs_set_chunk_length(buf
, chunk
, BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
290 btrfs_set_chunk_owner(buf
, chunk
, BTRFS_EXTENT_TREE_OBJECTID
);
291 btrfs_set_chunk_stripe_len(buf
, chunk
, 64 * 1024);
292 btrfs_set_chunk_type(buf
, chunk
, BTRFS_BLOCK_GROUP_SYSTEM
);
293 btrfs_set_chunk_io_align(buf
, chunk
, sectorsize
);
294 btrfs_set_chunk_io_width(buf
, chunk
, sectorsize
);
295 btrfs_set_chunk_sector_size(buf
, chunk
, sectorsize
);
296 btrfs_set_chunk_num_stripes(buf
, chunk
, 1);
297 btrfs_set_stripe_devid_nr(buf
, chunk
, 0, 1);
298 btrfs_set_stripe_offset_nr(buf
, chunk
, 0, 0);
301 write_extent_buffer(buf
, super
.dev_item
.uuid
,
302 (unsigned long)btrfs_stripe_dev_uuid(&chunk
->stripe
),
305 /* copy the key for the chunk to the system array */
306 ptr
= super
.sys_chunk_array
;
307 array_size
= sizeof(disk_key
);
309 memcpy(ptr
, &disk_key
, sizeof(disk_key
));
310 ptr
+= sizeof(disk_key
);
312 /* copy the chunk to the system array */
313 read_extent_buffer(buf
, ptr
, (unsigned long)chunk
, item_size
);
314 array_size
+= item_size
;
316 btrfs_set_super_sys_array_size(&super
, array_size
);
318 btrfs_set_header_bytenr(buf
, blocks
[3]);
319 btrfs_set_header_owner(buf
, BTRFS_CHUNK_TREE_OBJECTID
);
320 btrfs_set_header_nritems(buf
, nritems
);
321 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
322 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[3]);
324 /* create the device tree */
326 itemoff
= __BTRFS_LEAF_DATA_SIZE(leafsize
) -
327 sizeof(struct btrfs_dev_extent
);
329 btrfs_set_disk_key_objectid(&disk_key
, 1);
330 btrfs_set_disk_key_offset(&disk_key
, 0);
331 btrfs_set_disk_key_type(&disk_key
, BTRFS_DEV_EXTENT_KEY
);
332 btrfs_set_item_key(buf
, &disk_key
, nritems
);
333 btrfs_set_item_offset(buf
, btrfs_item_nr(buf
, nritems
), itemoff
);
334 btrfs_set_item_size(buf
, btrfs_item_nr(buf
, nritems
),
335 sizeof(struct btrfs_dev_extent
));
336 dev_extent
= btrfs_item_ptr(buf
, nritems
, struct btrfs_dev_extent
);
337 btrfs_set_dev_extent_chunk_tree(buf
, dev_extent
,
338 BTRFS_CHUNK_TREE_OBJECTID
);
339 btrfs_set_dev_extent_chunk_objectid(buf
, dev_extent
,
340 BTRFS_FIRST_CHUNK_TREE_OBJECTID
);
341 btrfs_set_dev_extent_chunk_offset(buf
, dev_extent
, 0);
343 write_extent_buffer(buf
, chunk_tree_uuid
,
344 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent
),
347 btrfs_set_dev_extent_length(buf
, dev_extent
,
348 BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
351 btrfs_set_header_bytenr(buf
, blocks
[4]);
352 btrfs_set_header_owner(buf
, BTRFS_DEV_TREE_OBJECTID
);
353 btrfs_set_header_nritems(buf
, nritems
);
354 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
355 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[4]);
357 /* create the FS root */
358 btrfs_set_header_bytenr(buf
, blocks
[5]);
359 btrfs_set_header_owner(buf
, BTRFS_FS_TREE_OBJECTID
);
360 btrfs_set_header_nritems(buf
, 0);
361 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
362 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[5]);
363 BUG_ON(ret
!= leafsize
);
365 /* finally create the csum root */
366 btrfs_set_header_bytenr(buf
, blocks
[6]);
367 btrfs_set_header_owner(buf
, BTRFS_CSUM_TREE_OBJECTID
);
368 btrfs_set_header_nritems(buf
, 0);
369 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
370 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[6]);
371 BUG_ON(ret
!= leafsize
);
373 /* and write out the super block */
374 BUG_ON(sizeof(super
) > sectorsize
);
375 memset(buf
->data
, 0, sectorsize
);
376 memcpy(buf
->data
, &super
, sizeof(super
));
377 buf
->len
= sectorsize
;
378 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
379 ret
= pwrite(fd
, buf
->data
, sectorsize
, blocks
[0]);
380 BUG_ON(ret
!= sectorsize
);
387 static u64
device_size(int fd
, struct stat
*st
)
390 if (S_ISREG(st
->st_mode
)) {
393 if (!S_ISBLK(st
->st_mode
)) {
396 if (ioctl(fd
, BLKGETSIZE64
, &size
) >= 0) {
402 static int zero_blocks(int fd
, off_t start
, size_t len
)
404 char *buf
= malloc(len
);
411 written
= pwrite(fd
, buf
, len
, start
);
418 static int zero_dev_start(int fd
)
421 size_t len
= 2 * 1024 * 1024;
424 /* don't overwrite the disk labels on sparc */
428 return zero_blocks(fd
, start
, len
);
431 static int zero_dev_end(int fd
, u64 dev_size
)
433 size_t len
= 2 * 1024 * 1024;
434 off_t start
= dev_size
- len
;
436 return zero_blocks(fd
, start
, len
);
439 int btrfs_add_to_fsid(struct btrfs_trans_handle
*trans
,
440 struct btrfs_root
*root
, int fd
, char *path
,
441 u64 block_count
, u32 io_width
, u32 io_align
,
444 struct btrfs_super_block
*disk_super
;
445 struct btrfs_super_block
*super
= &root
->fs_info
->super_copy
;
446 struct btrfs_device
*device
;
447 struct btrfs_dev_item
*dev_item
;
453 device
= kmalloc(sizeof(*device
), GFP_NOFS
);
456 buf
= kmalloc(sectorsize
, GFP_NOFS
);
461 BUG_ON(sizeof(*disk_super
) > sectorsize
);
462 memset(buf
, 0, sectorsize
);
464 disk_super
= (struct btrfs_super_block
*)buf
;
465 dev_item
= &disk_super
->dev_item
;
467 uuid_generate(device
->uuid
);
470 device
->io_width
= io_width
;
471 device
->io_align
= io_align
;
472 device
->sector_size
= sectorsize
;
474 device
->writeable
= 1;
475 device
->total_bytes
= block_count
;
476 device
->bytes_used
= 0;
477 device
->total_ios
= 0;
478 device
->dev_root
= root
->fs_info
->dev_root
;
480 ret
= btrfs_add_device(trans
, root
, device
);
483 total_bytes
= btrfs_super_total_bytes(super
) + block_count
;
484 btrfs_set_super_total_bytes(super
, total_bytes
);
486 num_devs
= btrfs_super_num_devices(super
) + 1;
487 btrfs_set_super_num_devices(super
, num_devs
);
489 memcpy(disk_super
, super
, sizeof(*disk_super
));
491 printf("adding device %s id %llu\n", path
,
492 (unsigned long long)device
->devid
);
494 btrfs_set_super_bytenr(disk_super
, BTRFS_SUPER_INFO_OFFSET
);
495 btrfs_set_stack_device_id(dev_item
, device
->devid
);
496 btrfs_set_stack_device_type(dev_item
, device
->type
);
497 btrfs_set_stack_device_io_align(dev_item
, device
->io_align
);
498 btrfs_set_stack_device_io_width(dev_item
, device
->io_width
);
499 btrfs_set_stack_device_sector_size(dev_item
, device
->sector_size
);
500 btrfs_set_stack_device_total_bytes(dev_item
, device
->total_bytes
);
501 btrfs_set_stack_device_bytes_used(dev_item
, device
->bytes_used
);
502 memcpy(&dev_item
->uuid
, device
->uuid
, BTRFS_UUID_SIZE
);
504 ret
= pwrite(fd
, buf
, sectorsize
, BTRFS_SUPER_INFO_OFFSET
);
505 BUG_ON(ret
!= sectorsize
);
508 list_add(&device
->dev_list
, &root
->fs_info
->fs_devices
->devices
);
509 device
->fs_devices
= root
->fs_info
->fs_devices
;
513 int btrfs_prepare_device(int fd
, char *file
, int zero_end
, u64
*block_count_ret
)
520 ret
= fstat(fd
, &st
);
522 fprintf(stderr
, "unable to stat %s\n", file
);
526 block_count
= device_size(fd
, &st
);
527 if (block_count
== 0) {
528 fprintf(stderr
, "unable to find %s size\n", file
);
533 if (block_count
< 256 * 1024 * 1024) {
534 fprintf(stderr
, "device %s is too small "
535 "(must be at least 256 MB)\n", file
);
538 ret
= zero_dev_start(fd
);
540 fprintf(stderr
, "failed to zero device start %d\n", ret
);
544 for (i
= 0 ; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
545 bytenr
= btrfs_sb_offset(i
);
546 if (bytenr
>= block_count
)
548 zero_blocks(fd
, bytenr
, BTRFS_SUPER_INFO_SIZE
);
552 ret
= zero_dev_end(fd
, block_count
);
554 fprintf(stderr
, "failed to zero device end %d\n", ret
);
558 *block_count_ret
= block_count
;
562 int btrfs_make_root_dir(struct btrfs_trans_handle
*trans
,
563 struct btrfs_root
*root
, u64 objectid
)
566 struct btrfs_inode_item inode_item
;
568 memset(&inode_item
, 0, sizeof(inode_item
));
569 btrfs_set_stack_inode_generation(&inode_item
, trans
->transid
);
570 btrfs_set_stack_inode_size(&inode_item
, 0);
571 btrfs_set_stack_inode_nlink(&inode_item
, 1);
572 btrfs_set_stack_inode_nbytes(&inode_item
, root
->leafsize
);
573 btrfs_set_stack_inode_mode(&inode_item
, S_IFDIR
| 0555);
575 if (root
->fs_info
->tree_root
== root
)
576 btrfs_set_super_root_dir(&root
->fs_info
->super_copy
, objectid
);
578 ret
= btrfs_insert_inode(trans
, root
, objectid
, &inode_item
);
582 ret
= btrfs_insert_inode_ref(trans
, root
, "..", 2, objectid
, objectid
, 0);
586 btrfs_set_root_dirid(&root
->root_item
, objectid
);
593 * returns 1 if the device was mounted, < 0 on error or 0 if everything
594 * is safe to continue. TODO, this should also scan multi-device filesystems
596 int check_mounted(char *file
)
606 if ((f
= setmntent ("/proc/mounts", "r")) == NULL
)
609 if (stat(file
, &st_buf
) < 0) {
612 if (S_ISBLK(st_buf
.st_mode
)) {
613 file_rdev
= st_buf
.st_rdev
;
615 file_dev
= st_buf
.st_dev
;
616 file_ino
= st_buf
.st_ino
;
620 while ((mnt
= getmntent (f
)) != NULL
) {
621 if (strcmp(file
, mnt
->mnt_fsname
) == 0)
624 if (stat(mnt
->mnt_fsname
, &st_buf
) == 0) {
625 if (S_ISBLK(st_buf
.st_mode
)) {
626 if (file_rdev
&& (file_rdev
== st_buf
.st_rdev
))
628 } else if (file_dev
&& ((file_dev
== st_buf
.st_dev
) &&
629 (file_ino
== st_buf
.st_ino
))) {
636 /* found an entry in mnt table */
645 struct list_head list
;
649 void btrfs_register_one_device(char *fname
)
651 struct btrfs_ioctl_vol_args args
;
655 fd
= open("/dev/btrfs-control", O_RDONLY
);
657 fprintf(stderr
, "failed to open /dev/btrfs-control "
658 "skipping device registration\n");
661 strcpy(args
.name
, fname
);
662 ret
= ioctl(fd
, BTRFS_IOC_SCAN_DEV
, &args
);
666 int btrfs_scan_one_dir(char *dirname
, int run_ioctl
)
669 struct dirent
*dirent
;
670 struct pending_dir
*pending
;
677 struct list_head pending_list
;
678 struct btrfs_fs_devices
*tmp_devices
;
681 INIT_LIST_HEAD(&pending_list
);
683 pending
= malloc(sizeof(*pending
));
686 strcpy(pending
->name
, dirname
);
689 dirname_len
= strlen(pending
->name
);
691 fullpath
= malloc(pathlen
);
692 dirname
= pending
->name
;
698 dirp
= opendir(dirname
);
700 fprintf(stderr
, "Unable to open /sys/block for scanning\n");
704 dirent
= readdir(dirp
);
707 if (dirent
->d_name
[0] == '.')
709 if (dirname_len
+ strlen(dirent
->d_name
) + 2 > pathlen
) {
713 snprintf(fullpath
, pathlen
, "%s/%s", dirname
, dirent
->d_name
);
714 ret
= lstat(fullpath
, &st
);
716 fprintf(stderr
, "failed to stat %s\n", fullpath
);
719 if (S_ISLNK(st
.st_mode
))
721 if (S_ISDIR(st
.st_mode
)) {
722 struct pending_dir
*next
= malloc(sizeof(*next
));
727 strcpy(next
->name
, fullpath
);
728 list_add_tail(&next
->list
, &pending_list
);
730 if (!S_ISBLK(st
.st_mode
)) {
733 fd
= open(fullpath
, O_RDONLY
);
735 fprintf(stderr
, "failed to read %s\n", fullpath
);
738 ret
= btrfs_scan_one_device(fd
, fullpath
, &tmp_devices
,
740 BTRFS_SUPER_INFO_OFFSET
);
741 if (ret
== 0 && run_ioctl
> 0) {
742 btrfs_register_one_device(fullpath
);
746 if (!list_empty(&pending_list
)) {
748 pending
= list_entry(pending_list
.next
, struct pending_dir
,
750 list_del(&pending
->list
);
762 int btrfs_scan_for_fsid(struct btrfs_fs_devices
*fs_devices
, u64 total_devs
,
765 return btrfs_scan_one_dir("/dev", run_ioctls
);
768 int btrfs_device_already_in_root(struct btrfs_root
*root
, int fd
,
771 struct btrfs_super_block
*disk_super
;
775 buf
= malloc(BTRFS_SUPER_INFO_SIZE
);
780 ret
= pread(fd
, buf
, BTRFS_SUPER_INFO_SIZE
, super_offset
);
781 if (ret
!= BTRFS_SUPER_INFO_SIZE
)
785 disk_super
= (struct btrfs_super_block
*)buf
;
786 if (strncmp((char *)(&disk_super
->magic
), BTRFS_MAGIC
,
787 sizeof(disk_super
->magic
)))
790 if (!memcmp(disk_super
->fsid
, root
->fs_info
->super_copy
.fsid
,
799 static char *size_strs
[] = { "", "KB", "MB", "GB", "TB",
800 "PB", "EB", "ZB", "YB"};
801 char *pretty_sizes(u64 size
)
804 u64 last_size
= size
;
805 u64 fract_size
= size
;
810 fract_size
= last_size
;
817 if (num_divs
> ARRAY_SIZE(size_strs
))
820 fraction
= (float)fract_size
/ 1024;
822 sprintf(pretty
, "%.2f%s", fraction
, size_strs
[num_divs
-1]);