2 * Copyright (C) 2007 Oracle. All rights reserved.
3 * Copyright (C) 2008 Morey Roof. All rights reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public
7 * License v2 as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public
15 * License along with this program; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 021110-1307, USA.
20 #define _XOPEN_SOURCE 700
21 #define __USE_XOPEN2K8
22 #define __XOPEN2K8 /* due to an error in dirent.h, to get dirfd() */
23 #define _GNU_SOURCE /* O_NOATIME */
27 #include <sys/ioctl.h>
28 #include <sys/mount.h>
29 #include <sys/types.h>
31 #include <uuid/uuid.h>
36 #include <linux/loop.h>
37 #include <linux/major.h>
38 #include <linux/kdev_t.h>
40 #include <blkid/blkid.h>
41 #include "kerncompat.h"
42 #include "radix-tree.h"
45 #include "transaction.h"
52 #define BLKDISCARD _IO(0x12,119)
56 discard_blocks(int fd
, u64 start
, u64 len
)
58 u64 range
[2] = { start
, len
};
60 if (ioctl(fd
, BLKDISCARD
, &range
) < 0)
65 static u64 reference_root_table
[] = {
66 [1] = BTRFS_ROOT_TREE_OBJECTID
,
67 [2] = BTRFS_EXTENT_TREE_OBJECTID
,
68 [3] = BTRFS_CHUNK_TREE_OBJECTID
,
69 [4] = BTRFS_DEV_TREE_OBJECTID
,
70 [5] = BTRFS_FS_TREE_OBJECTID
,
71 [6] = BTRFS_CSUM_TREE_OBJECTID
,
74 int make_btrfs(int fd
, const char *device
, const char *label
,
75 u64 blocks
[7], u64 num_bytes
, u32 nodesize
,
76 u32 leafsize
, u32 sectorsize
, u32 stripesize
, u64 features
)
78 struct btrfs_super_block super
;
79 struct extent_buffer
*buf
;
80 struct btrfs_root_item root_item
;
81 struct btrfs_disk_key disk_key
;
82 struct btrfs_extent_item
*extent_item
;
83 struct btrfs_inode_item
*inode_item
;
84 struct btrfs_chunk
*chunk
;
85 struct btrfs_dev_item
*dev_item
;
86 struct btrfs_dev_extent
*dev_extent
;
87 u8 chunk_tree_uuid
[BTRFS_UUID_SIZE
];
97 int skinny_metadata
= !!(features
&
98 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA
);
100 first_free
= BTRFS_SUPER_INFO_OFFSET
+ sectorsize
* 2 - 1;
101 first_free
&= ~((u64
)sectorsize
- 1);
103 memset(&super
, 0, sizeof(super
));
105 num_bytes
= (num_bytes
/ sectorsize
) * sectorsize
;
106 uuid_generate(super
.fsid
);
107 uuid_generate(super
.dev_item
.uuid
);
108 uuid_generate(chunk_tree_uuid
);
110 btrfs_set_super_bytenr(&super
, blocks
[0]);
111 btrfs_set_super_num_devices(&super
, 1);
112 btrfs_set_super_magic(&super
, BTRFS_MAGIC
);
113 btrfs_set_super_generation(&super
, 1);
114 btrfs_set_super_root(&super
, blocks
[1]);
115 btrfs_set_super_chunk_root(&super
, blocks
[3]);
116 btrfs_set_super_total_bytes(&super
, num_bytes
);
117 btrfs_set_super_bytes_used(&super
, 6 * leafsize
);
118 btrfs_set_super_sectorsize(&super
, sectorsize
);
119 btrfs_set_super_leafsize(&super
, leafsize
);
120 btrfs_set_super_nodesize(&super
, nodesize
);
121 btrfs_set_super_stripesize(&super
, stripesize
);
122 btrfs_set_super_csum_type(&super
, BTRFS_CSUM_TYPE_CRC32
);
123 btrfs_set_super_chunk_root_generation(&super
, 1);
124 btrfs_set_super_cache_generation(&super
, -1);
125 btrfs_set_super_incompat_flags(&super
, features
);
127 strncpy(super
.label
, label
, BTRFS_LABEL_SIZE
- 1);
129 buf
= malloc(sizeof(*buf
) + max(sectorsize
, leafsize
));
131 /* create the tree of root objects */
132 memset(buf
->data
, 0, leafsize
);
134 btrfs_set_header_bytenr(buf
, blocks
[1]);
135 btrfs_set_header_nritems(buf
, 4);
136 btrfs_set_header_generation(buf
, 1);
137 btrfs_set_header_backref_rev(buf
, BTRFS_MIXED_BACKREF_REV
);
138 btrfs_set_header_owner(buf
, BTRFS_ROOT_TREE_OBJECTID
);
139 write_extent_buffer(buf
, super
.fsid
, btrfs_header_fsid(),
142 write_extent_buffer(buf
, chunk_tree_uuid
, (unsigned long)
143 btrfs_header_chunk_tree_uuid(buf
),
146 /* create the items for the root tree */
147 memset(&root_item
, 0, sizeof(root_item
));
148 inode_item
= &root_item
.inode
;
149 btrfs_set_stack_inode_generation(inode_item
, 1);
150 btrfs_set_stack_inode_size(inode_item
, 3);
151 btrfs_set_stack_inode_nlink(inode_item
, 1);
152 btrfs_set_stack_inode_nbytes(inode_item
, leafsize
);
153 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
154 btrfs_set_root_refs(&root_item
, 1);
155 btrfs_set_root_used(&root_item
, leafsize
);
156 btrfs_set_root_generation(&root_item
, 1);
158 memset(&disk_key
, 0, sizeof(disk_key
));
159 btrfs_set_disk_key_type(&disk_key
, BTRFS_ROOT_ITEM_KEY
);
160 btrfs_set_disk_key_offset(&disk_key
, 0);
163 itemoff
= __BTRFS_LEAF_DATA_SIZE(leafsize
) - sizeof(root_item
);
164 btrfs_set_root_bytenr(&root_item
, blocks
[2]);
165 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_EXTENT_TREE_OBJECTID
);
166 btrfs_set_item_key(buf
, &disk_key
, nritems
);
167 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
168 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
170 write_extent_buffer(buf
, &root_item
, btrfs_item_ptr_offset(buf
,
171 nritems
), sizeof(root_item
));
174 itemoff
= itemoff
- sizeof(root_item
);
175 btrfs_set_root_bytenr(&root_item
, blocks
[4]);
176 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_DEV_TREE_OBJECTID
);
177 btrfs_set_item_key(buf
, &disk_key
, nritems
);
178 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
179 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
181 write_extent_buffer(buf
, &root_item
,
182 btrfs_item_ptr_offset(buf
, nritems
),
186 itemoff
= itemoff
- sizeof(root_item
);
187 btrfs_set_root_bytenr(&root_item
, blocks
[5]);
188 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_FS_TREE_OBJECTID
);
189 btrfs_set_item_key(buf
, &disk_key
, nritems
);
190 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
191 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
193 write_extent_buffer(buf
, &root_item
,
194 btrfs_item_ptr_offset(buf
, nritems
),
198 itemoff
= itemoff
- sizeof(root_item
);
199 btrfs_set_root_bytenr(&root_item
, blocks
[6]);
200 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_CSUM_TREE_OBJECTID
);
201 btrfs_set_item_key(buf
, &disk_key
, nritems
);
202 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
203 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
205 write_extent_buffer(buf
, &root_item
,
206 btrfs_item_ptr_offset(buf
, nritems
),
211 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
212 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[1]);
213 if (ret
!= leafsize
) {
214 ret
= (ret
< 0 ? -errno
: -EIO
);
218 /* create the items for the extent tree */
219 memset(buf
->data
+sizeof(struct btrfs_header
), 0,
220 leafsize
-sizeof(struct btrfs_header
));
222 itemoff
= __BTRFS_LEAF_DATA_SIZE(leafsize
);
223 for (i
= 1; i
< 7; i
++) {
224 item_size
= sizeof(struct btrfs_extent_item
);
225 if (!skinny_metadata
)
226 item_size
+= sizeof(struct btrfs_tree_block_info
);
228 BUG_ON(blocks
[i
] < first_free
);
229 BUG_ON(blocks
[i
] < blocks
[i
- 1]);
231 /* create extent item */
232 itemoff
-= item_size
;
233 btrfs_set_disk_key_objectid(&disk_key
, blocks
[i
]);
234 if (skinny_metadata
) {
235 btrfs_set_disk_key_type(&disk_key
,
236 BTRFS_METADATA_ITEM_KEY
);
237 btrfs_set_disk_key_offset(&disk_key
, 0);
239 btrfs_set_disk_key_type(&disk_key
,
240 BTRFS_EXTENT_ITEM_KEY
);
241 btrfs_set_disk_key_offset(&disk_key
, leafsize
);
243 btrfs_set_item_key(buf
, &disk_key
, nritems
);
244 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
),
246 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
248 extent_item
= btrfs_item_ptr(buf
, nritems
,
249 struct btrfs_extent_item
);
250 btrfs_set_extent_refs(buf
, extent_item
, 1);
251 btrfs_set_extent_generation(buf
, extent_item
, 1);
252 btrfs_set_extent_flags(buf
, extent_item
,
253 BTRFS_EXTENT_FLAG_TREE_BLOCK
);
256 /* create extent ref */
257 ref_root
= reference_root_table
[i
];
258 btrfs_set_disk_key_objectid(&disk_key
, blocks
[i
]);
259 btrfs_set_disk_key_offset(&disk_key
, ref_root
);
260 btrfs_set_disk_key_type(&disk_key
, BTRFS_TREE_BLOCK_REF_KEY
);
261 btrfs_set_item_key(buf
, &disk_key
, nritems
);
262 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
),
264 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
), 0);
267 btrfs_set_header_bytenr(buf
, blocks
[2]);
268 btrfs_set_header_owner(buf
, BTRFS_EXTENT_TREE_OBJECTID
);
269 btrfs_set_header_nritems(buf
, nritems
);
270 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
271 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[2]);
272 if (ret
!= leafsize
) {
273 ret
= (ret
< 0 ? -errno
: -EIO
);
277 /* create the chunk tree */
278 memset(buf
->data
+sizeof(struct btrfs_header
), 0,
279 leafsize
-sizeof(struct btrfs_header
));
281 item_size
= sizeof(*dev_item
);
282 itemoff
= __BTRFS_LEAF_DATA_SIZE(leafsize
) - item_size
;
284 /* first device 1 (there is no device 0) */
285 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_DEV_ITEMS_OBJECTID
);
286 btrfs_set_disk_key_offset(&disk_key
, 1);
287 btrfs_set_disk_key_type(&disk_key
, BTRFS_DEV_ITEM_KEY
);
288 btrfs_set_item_key(buf
, &disk_key
, nritems
);
289 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
290 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
), item_size
);
292 dev_item
= btrfs_item_ptr(buf
, nritems
, struct btrfs_dev_item
);
293 btrfs_set_device_id(buf
, dev_item
, 1);
294 btrfs_set_device_generation(buf
, dev_item
, 0);
295 btrfs_set_device_total_bytes(buf
, dev_item
, num_bytes
);
296 btrfs_set_device_bytes_used(buf
, dev_item
,
297 BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
298 btrfs_set_device_io_align(buf
, dev_item
, sectorsize
);
299 btrfs_set_device_io_width(buf
, dev_item
, sectorsize
);
300 btrfs_set_device_sector_size(buf
, dev_item
, sectorsize
);
301 btrfs_set_device_type(buf
, dev_item
, 0);
303 write_extent_buffer(buf
, super
.dev_item
.uuid
,
304 (unsigned long)btrfs_device_uuid(dev_item
),
306 write_extent_buffer(buf
, super
.fsid
,
307 (unsigned long)btrfs_device_fsid(dev_item
),
309 read_extent_buffer(buf
, &super
.dev_item
, (unsigned long)dev_item
,
313 item_size
= btrfs_chunk_item_size(1);
314 itemoff
= itemoff
- item_size
;
316 /* then we have chunk 0 */
317 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_FIRST_CHUNK_TREE_OBJECTID
);
318 btrfs_set_disk_key_offset(&disk_key
, 0);
319 btrfs_set_disk_key_type(&disk_key
, BTRFS_CHUNK_ITEM_KEY
);
320 btrfs_set_item_key(buf
, &disk_key
, nritems
);
321 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
322 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
), item_size
);
324 chunk
= btrfs_item_ptr(buf
, nritems
, struct btrfs_chunk
);
325 btrfs_set_chunk_length(buf
, chunk
, BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
326 btrfs_set_chunk_owner(buf
, chunk
, BTRFS_EXTENT_TREE_OBJECTID
);
327 btrfs_set_chunk_stripe_len(buf
, chunk
, 64 * 1024);
328 btrfs_set_chunk_type(buf
, chunk
, BTRFS_BLOCK_GROUP_SYSTEM
);
329 btrfs_set_chunk_io_align(buf
, chunk
, sectorsize
);
330 btrfs_set_chunk_io_width(buf
, chunk
, sectorsize
);
331 btrfs_set_chunk_sector_size(buf
, chunk
, sectorsize
);
332 btrfs_set_chunk_num_stripes(buf
, chunk
, 1);
333 btrfs_set_stripe_devid_nr(buf
, chunk
, 0, 1);
334 btrfs_set_stripe_offset_nr(buf
, chunk
, 0, 0);
337 write_extent_buffer(buf
, super
.dev_item
.uuid
,
338 (unsigned long)btrfs_stripe_dev_uuid(&chunk
->stripe
),
341 /* copy the key for the chunk to the system array */
342 ptr
= super
.sys_chunk_array
;
343 array_size
= sizeof(disk_key
);
345 memcpy(ptr
, &disk_key
, sizeof(disk_key
));
346 ptr
+= sizeof(disk_key
);
348 /* copy the chunk to the system array */
349 read_extent_buffer(buf
, ptr
, (unsigned long)chunk
, item_size
);
350 array_size
+= item_size
;
352 btrfs_set_super_sys_array_size(&super
, array_size
);
354 btrfs_set_header_bytenr(buf
, blocks
[3]);
355 btrfs_set_header_owner(buf
, BTRFS_CHUNK_TREE_OBJECTID
);
356 btrfs_set_header_nritems(buf
, nritems
);
357 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
358 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[3]);
359 if (ret
!= leafsize
) {
360 ret
= (ret
< 0 ? -errno
: -EIO
);
364 /* create the device tree */
365 memset(buf
->data
+sizeof(struct btrfs_header
), 0,
366 leafsize
-sizeof(struct btrfs_header
));
368 itemoff
= __BTRFS_LEAF_DATA_SIZE(leafsize
) -
369 sizeof(struct btrfs_dev_extent
);
371 btrfs_set_disk_key_objectid(&disk_key
, 1);
372 btrfs_set_disk_key_offset(&disk_key
, 0);
373 btrfs_set_disk_key_type(&disk_key
, BTRFS_DEV_EXTENT_KEY
);
374 btrfs_set_item_key(buf
, &disk_key
, nritems
);
375 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
376 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
377 sizeof(struct btrfs_dev_extent
));
378 dev_extent
= btrfs_item_ptr(buf
, nritems
, struct btrfs_dev_extent
);
379 btrfs_set_dev_extent_chunk_tree(buf
, dev_extent
,
380 BTRFS_CHUNK_TREE_OBJECTID
);
381 btrfs_set_dev_extent_chunk_objectid(buf
, dev_extent
,
382 BTRFS_FIRST_CHUNK_TREE_OBJECTID
);
383 btrfs_set_dev_extent_chunk_offset(buf
, dev_extent
, 0);
385 write_extent_buffer(buf
, chunk_tree_uuid
,
386 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent
),
389 btrfs_set_dev_extent_length(buf
, dev_extent
,
390 BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
393 btrfs_set_header_bytenr(buf
, blocks
[4]);
394 btrfs_set_header_owner(buf
, BTRFS_DEV_TREE_OBJECTID
);
395 btrfs_set_header_nritems(buf
, nritems
);
396 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
397 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[4]);
398 if (ret
!= leafsize
) {
399 ret
= (ret
< 0 ? -errno
: -EIO
);
403 /* create the FS root */
404 memset(buf
->data
+sizeof(struct btrfs_header
), 0,
405 leafsize
-sizeof(struct btrfs_header
));
406 btrfs_set_header_bytenr(buf
, blocks
[5]);
407 btrfs_set_header_owner(buf
, BTRFS_FS_TREE_OBJECTID
);
408 btrfs_set_header_nritems(buf
, 0);
409 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
410 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[5]);
411 if (ret
!= leafsize
) {
412 ret
= (ret
< 0 ? -errno
: -EIO
);
415 /* finally create the csum root */
416 memset(buf
->data
+sizeof(struct btrfs_header
), 0,
417 leafsize
-sizeof(struct btrfs_header
));
418 btrfs_set_header_bytenr(buf
, blocks
[6]);
419 btrfs_set_header_owner(buf
, BTRFS_CSUM_TREE_OBJECTID
);
420 btrfs_set_header_nritems(buf
, 0);
421 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
422 ret
= pwrite(fd
, buf
->data
, leafsize
, blocks
[6]);
423 if (ret
!= leafsize
) {
424 ret
= (ret
< 0 ? -errno
: -EIO
);
428 /* and write out the super block */
429 BUG_ON(sizeof(super
) > sectorsize
);
430 memset(buf
->data
, 0, sectorsize
);
431 memcpy(buf
->data
, &super
, sizeof(super
));
432 buf
->len
= sectorsize
;
433 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
434 ret
= pwrite(fd
, buf
->data
, sectorsize
, blocks
[0]);
435 if (ret
!= sectorsize
) {
436 ret
= (ret
< 0 ? -errno
: -EIO
);
447 u64
btrfs_device_size(int fd
, struct stat
*st
)
450 if (S_ISREG(st
->st_mode
)) {
453 if (!S_ISBLK(st
->st_mode
)) {
456 if (ioctl(fd
, BLKGETSIZE64
, &size
) >= 0) {
462 static int zero_blocks(int fd
, off_t start
, size_t len
)
464 char *buf
= malloc(len
);
471 written
= pwrite(fd
, buf
, len
, start
);
478 static int zero_dev_start(int fd
)
481 size_t len
= 2 * 1024 * 1024;
484 /* don't overwrite the disk labels on sparc */
488 return zero_blocks(fd
, start
, len
);
491 static int zero_dev_end(int fd
, u64 dev_size
)
493 size_t len
= 2 * 1024 * 1024;
494 off_t start
= dev_size
- len
;
496 return zero_blocks(fd
, start
, len
);
499 int btrfs_add_to_fsid(struct btrfs_trans_handle
*trans
,
500 struct btrfs_root
*root
, int fd
, char *path
,
501 u64 block_count
, u32 io_width
, u32 io_align
,
504 struct btrfs_super_block
*disk_super
;
505 struct btrfs_super_block
*super
= root
->fs_info
->super_copy
;
506 struct btrfs_device
*device
;
507 struct btrfs_dev_item
*dev_item
;
513 device
= kzalloc(sizeof(*device
), GFP_NOFS
);
516 buf
= kmalloc(sectorsize
, GFP_NOFS
);
521 BUG_ON(sizeof(*disk_super
) > sectorsize
);
522 memset(buf
, 0, sectorsize
);
524 disk_super
= (struct btrfs_super_block
*)buf
;
525 dev_item
= &disk_super
->dev_item
;
527 uuid_generate(device
->uuid
);
530 device
->io_width
= io_width
;
531 device
->io_align
= io_align
;
532 device
->sector_size
= sectorsize
;
534 device
->writeable
= 1;
535 device
->total_bytes
= block_count
;
536 device
->bytes_used
= 0;
537 device
->total_ios
= 0;
538 device
->dev_root
= root
->fs_info
->dev_root
;
540 ret
= btrfs_add_device(trans
, root
, device
);
543 total_bytes
= btrfs_super_total_bytes(super
) + block_count
;
544 btrfs_set_super_total_bytes(super
, total_bytes
);
546 num_devs
= btrfs_super_num_devices(super
) + 1;
547 btrfs_set_super_num_devices(super
, num_devs
);
549 memcpy(disk_super
, super
, sizeof(*disk_super
));
551 printf("adding device %s id %llu\n", path
,
552 (unsigned long long)device
->devid
);
554 btrfs_set_super_bytenr(disk_super
, BTRFS_SUPER_INFO_OFFSET
);
555 btrfs_set_stack_device_id(dev_item
, device
->devid
);
556 btrfs_set_stack_device_type(dev_item
, device
->type
);
557 btrfs_set_stack_device_io_align(dev_item
, device
->io_align
);
558 btrfs_set_stack_device_io_width(dev_item
, device
->io_width
);
559 btrfs_set_stack_device_sector_size(dev_item
, device
->sector_size
);
560 btrfs_set_stack_device_total_bytes(dev_item
, device
->total_bytes
);
561 btrfs_set_stack_device_bytes_used(dev_item
, device
->bytes_used
);
562 memcpy(&dev_item
->uuid
, device
->uuid
, BTRFS_UUID_SIZE
);
564 ret
= pwrite(fd
, buf
, sectorsize
, BTRFS_SUPER_INFO_OFFSET
);
565 BUG_ON(ret
!= sectorsize
);
568 list_add(&device
->dev_list
, &root
->fs_info
->fs_devices
->devices
);
569 device
->fs_devices
= root
->fs_info
->fs_devices
;
573 int btrfs_prepare_device(int fd
, char *file
, int zero_end
, u64
*block_count_ret
,
574 u64 max_block_count
, int *mixed
, int discard
)
581 ret
= fstat(fd
, &st
);
583 fprintf(stderr
, "unable to stat %s\n", file
);
587 block_count
= btrfs_device_size(fd
, &st
);
588 if (block_count
== 0) {
589 fprintf(stderr
, "unable to find %s size\n", file
);
593 block_count
= min(block_count
, max_block_count
);
596 if (block_count
< 1024 * 1024 * 1024 && !(*mixed
)) {
597 printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
603 * We intentionally ignore errors from the discard ioctl. It
604 * is not necessary for the mkfs functionality but just an
607 if (discard_blocks(fd
, 0, 0) == 0) {
608 fprintf(stderr
, "Performing full device TRIM (%s) ...\n",
609 pretty_size(block_count
));
610 discard_blocks(fd
, 0, block_count
);
614 ret
= zero_dev_start(fd
);
616 fprintf(stderr
, "failed to zero device start %d\n", ret
);
620 for (i
= 0 ; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
621 bytenr
= btrfs_sb_offset(i
);
622 if (bytenr
>= block_count
)
624 zero_blocks(fd
, bytenr
, BTRFS_SUPER_INFO_SIZE
);
628 ret
= zero_dev_end(fd
, block_count
);
630 fprintf(stderr
, "failed to zero device end %d\n", ret
);
634 *block_count_ret
= block_count
;
638 int btrfs_make_root_dir(struct btrfs_trans_handle
*trans
,
639 struct btrfs_root
*root
, u64 objectid
)
642 struct btrfs_inode_item inode_item
;
643 time_t now
= time(NULL
);
645 memset(&inode_item
, 0, sizeof(inode_item
));
646 btrfs_set_stack_inode_generation(&inode_item
, trans
->transid
);
647 btrfs_set_stack_inode_size(&inode_item
, 0);
648 btrfs_set_stack_inode_nlink(&inode_item
, 1);
649 btrfs_set_stack_inode_nbytes(&inode_item
, root
->leafsize
);
650 btrfs_set_stack_inode_mode(&inode_item
, S_IFDIR
| 0755);
651 btrfs_set_stack_timespec_sec(&inode_item
.atime
, now
);
652 btrfs_set_stack_timespec_nsec(&inode_item
.atime
, 0);
653 btrfs_set_stack_timespec_sec(&inode_item
.ctime
, now
);
654 btrfs_set_stack_timespec_nsec(&inode_item
.ctime
, 0);
655 btrfs_set_stack_timespec_sec(&inode_item
.mtime
, now
);
656 btrfs_set_stack_timespec_nsec(&inode_item
.mtime
, 0);
657 btrfs_set_stack_timespec_sec(&inode_item
.otime
, 0);
658 btrfs_set_stack_timespec_nsec(&inode_item
.otime
, 0);
660 if (root
->fs_info
->tree_root
== root
)
661 btrfs_set_super_root_dir(root
->fs_info
->super_copy
, objectid
);
663 ret
= btrfs_insert_inode(trans
, root
, objectid
, &inode_item
);
667 ret
= btrfs_insert_inode_ref(trans
, root
, "..", 2, objectid
, objectid
, 0);
671 btrfs_set_root_dirid(&root
->root_item
, objectid
);
678 * checks if a path is a block device node
679 * Returns negative errno on failure, otherwise
680 * returns 1 for blockdev, 0 for not-blockdev
682 int is_block_device(const char *path
)
686 if (stat(path
, &statbuf
) < 0)
689 return S_ISBLK(statbuf
.st_mode
);
693 * check if given path is a mount point
694 * return 1 if yes. 0 if no. -1 for error
696 int is_mount_point(const char *path
)
702 f
= setmntent("/proc/self/mounts", "r");
706 while ((mnt
= getmntent(f
)) != NULL
) {
707 if (strcmp(mnt
->mnt_dir
, path
))
717 * Find the mount point for a mounted device.
718 * On success, returns 0 with mountpoint in *mp.
719 * On failure, returns -errno (not mounted yields -EINVAL)
720 * Is noisy on failures, expects to be given a mounted device.
722 int get_btrfs_mount(const char *dev
, char *mp
, size_t mp_size
)
727 ret
= is_block_device(dev
);
730 fprintf(stderr
, "%s is not a block device\n", dev
);
733 fprintf(stderr
, "Could not check %s: %s\n",
734 dev
, strerror(-ret
));
739 fd
= open(dev
, O_RDONLY
);
742 fprintf(stderr
, "Could not open %s: %s\n", dev
, strerror(errno
));
746 ret
= check_mounted_where(fd
, dev
, mp
, mp_size
, NULL
);
749 } else { /* mounted, all good */
759 * Given a pathname, return a filehandle to:
760 * the original pathname or,
761 * if the pathname is a mounted btrfs device, to its mountpoint.
763 * On error, return -1, errno should be set.
765 int open_path_or_dev_mnt(const char *path
, DIR **dirstream
)
767 char mp
[BTRFS_PATH_NAME_MAX
+ 1];
770 if (is_block_device(path
)) {
773 ret
= get_btrfs_mount(path
, mp
, sizeof(mp
));
775 /* not a mounted btrfs dev */
779 fdmnt
= open_file_or_dir(mp
, dirstream
);
781 fdmnt
= open_file_or_dir(path
, dirstream
);
787 /* checks if a device is a loop device */
788 static int is_loop_device (const char* device
) {
791 if(stat(device
, &statbuf
) < 0)
794 return (S_ISBLK(statbuf
.st_mode
) &&
795 MAJOR(statbuf
.st_rdev
) == LOOP_MAJOR
);
799 /* Takes a loop device path (e.g. /dev/loop0) and returns
800 * the associated file (e.g. /images/my_btrfs.img) */
801 static int resolve_loop_device(const char* loop_dev
, char* loop_file
,
808 char real_loop_dev
[PATH_MAX
];
810 if (!realpath(loop_dev
, real_loop_dev
))
812 snprintf(p
, PATH_MAX
, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev
, '/'));
813 if (!(f
= fopen(p
, "r")))
816 snprintf(fmt
, 20, "%%%i[^\n]", max_len
-1);
817 ret
= fscanf(f
, fmt
, loop_file
);
825 /* Checks whether a and b are identical or device
826 * files associated with the same block device
828 static int is_same_blk_file(const char* a
, const char* b
)
830 struct stat st_buf_a
, st_buf_b
;
831 char real_a
[PATH_MAX
];
832 char real_b
[PATH_MAX
];
834 if(!realpath(a
, real_a
) ||
835 !realpath(b
, real_b
))
840 /* Identical path? */
841 if(strcmp(real_a
, real_b
) == 0)
844 if(stat(a
, &st_buf_a
) < 0 ||
845 stat(b
, &st_buf_b
) < 0)
852 /* Same blockdevice? */
853 if(S_ISBLK(st_buf_a
.st_mode
) &&
854 S_ISBLK(st_buf_b
.st_mode
) &&
855 st_buf_a
.st_rdev
== st_buf_b
.st_rdev
)
861 if (st_buf_a
.st_dev
== st_buf_b
.st_dev
&&
862 st_buf_a
.st_ino
== st_buf_b
.st_ino
)
870 /* checks if a and b are identical or device
871 * files associated with the same block device or
872 * if one file is a loop device that uses the other
875 static int is_same_loop_file(const char* a
, const char* b
)
877 char res_a
[PATH_MAX
];
878 char res_b
[PATH_MAX
];
883 /* Resolve a if it is a loop device */
884 if((ret
= is_loop_device(a
)) < 0) {
889 if ((ret
= resolve_loop_device(a
, res_a
, sizeof(res_a
))) < 0)
897 /* Resolve b if it is a loop device */
898 if ((ret
= is_loop_device(b
)) < 0) {
903 if((ret
= resolve_loop_device(b
, res_b
, sizeof(res_b
))) < 0)
911 return is_same_blk_file(final_a
, final_b
);
914 /* Checks if a file exists and is a block or regular file*/
915 static int is_existing_blk_or_reg_file(const char* filename
)
919 if(stat(filename
, &st_buf
) < 0) {
926 return (S_ISBLK(st_buf
.st_mode
) || S_ISREG(st_buf
.st_mode
));
929 /* Checks if a file is used (directly or indirectly via a loop device)
930 * by a device in fs_devices
932 static int blk_file_in_dev_list(struct btrfs_fs_devices
* fs_devices
,
936 struct list_head
*head
;
937 struct list_head
*cur
;
938 struct btrfs_device
*device
;
940 head
= &fs_devices
->devices
;
941 list_for_each(cur
, head
) {
942 device
= list_entry(cur
, struct btrfs_device
, dev_list
);
944 if((ret
= is_same_loop_file(device
->name
, file
)))
952 * returns 1 if the device was mounted, < 0 on error or 0 if everything
953 * is safe to continue.
955 int check_mounted(const char* file
)
960 fd
= open(file
, O_RDONLY
);
962 fprintf (stderr
, "check_mounted(): Could not open %s\n", file
);
966 ret
= check_mounted_where(fd
, file
, NULL
, 0, NULL
);
972 int check_mounted_where(int fd
, const char *file
, char *where
, int size
,
973 struct btrfs_fs_devices
**fs_dev_ret
)
978 struct btrfs_fs_devices
*fs_devices_mnt
= NULL
;
982 /* scan the initial device */
983 ret
= btrfs_scan_one_device(fd
, file
, &fs_devices_mnt
,
984 &total_devs
, BTRFS_SUPER_INFO_OFFSET
);
985 is_btrfs
= (ret
>= 0);
987 /* scan other devices */
988 if (is_btrfs
&& total_devs
> 1) {
989 if ((ret
= btrfs_scan_for_fsid(!BTRFS_UPDATE_KERNEL
)))
993 /* iterate over the list of currently mountes filesystems */
994 if ((f
= setmntent ("/proc/mounts", "r")) == NULL
)
997 while ((mnt
= getmntent (f
)) != NULL
) {
999 if(strcmp(mnt
->mnt_type
, "btrfs") != 0)
1002 ret
= blk_file_in_dev_list(fs_devices_mnt
, mnt
->mnt_fsname
);
1004 /* ignore entries in the mount table that are not
1005 associated with a file*/
1006 if((ret
= is_existing_blk_or_reg_file(mnt
->mnt_fsname
)) < 0)
1007 goto out_mntloop_err
;
1011 ret
= is_same_loop_file(file
, mnt
->mnt_fsname
);
1015 goto out_mntloop_err
;
1020 /* Did we find an entry in mnt table? */
1021 if (mnt
&& size
&& where
) {
1022 strncpy(where
, mnt
->mnt_dir
, size
);
1026 *fs_dev_ret
= fs_devices_mnt
;
1028 ret
= (mnt
!= NULL
);
1036 struct pending_dir
{
1037 struct list_head list
;
1038 char name
[PATH_MAX
];
1041 void btrfs_register_one_device(char *fname
)
1043 struct btrfs_ioctl_vol_args args
;
1048 fd
= open("/dev/btrfs-control", O_RDONLY
);
1050 fprintf(stderr
, "failed to open /dev/btrfs-control "
1051 "skipping device registration: %s\n",
1055 strncpy(args
.name
, fname
, BTRFS_PATH_NAME_MAX
);
1056 args
.name
[BTRFS_PATH_NAME_MAX
-1] = 0;
1057 ret
= ioctl(fd
, BTRFS_IOC_SCAN_DEV
, &args
);
1060 fprintf(stderr
, "ERROR: device scan failed '%s' - %s\n",
1061 fname
, strerror(e
));
1066 int btrfs_scan_one_dir(char *dirname
, int run_ioctl
)
1069 struct dirent
*dirent
;
1070 struct pending_dir
*pending
;
1076 struct list_head pending_list
;
1077 struct btrfs_fs_devices
*tmp_devices
;
1080 INIT_LIST_HEAD(&pending_list
);
1082 pending
= malloc(sizeof(*pending
));
1085 strcpy(pending
->name
, dirname
);
1088 dirname_len
= strlen(pending
->name
);
1089 fullpath
= malloc(PATH_MAX
);
1090 dirname
= pending
->name
;
1096 dirp
= opendir(dirname
);
1098 fprintf(stderr
, "Unable to open %s for scanning\n", dirname
);
1103 dirent
= readdir(dirp
);
1106 if (dirent
->d_name
[0] == '.')
1108 if (dirname_len
+ strlen(dirent
->d_name
) + 2 > PATH_MAX
) {
1112 snprintf(fullpath
, PATH_MAX
, "%s/%s", dirname
, dirent
->d_name
);
1113 ret
= lstat(fullpath
, &st
);
1115 fprintf(stderr
, "failed to stat %s\n", fullpath
);
1118 if (S_ISLNK(st
.st_mode
))
1120 if (S_ISDIR(st
.st_mode
)) {
1121 struct pending_dir
*next
= malloc(sizeof(*next
));
1126 strcpy(next
->name
, fullpath
);
1127 list_add_tail(&next
->list
, &pending_list
);
1129 if (!S_ISBLK(st
.st_mode
)) {
1132 fd
= open(fullpath
, O_RDONLY
);
1134 /* ignore the following errors:
1135 ENXIO (device don't exists)
1136 ENOMEDIUM (No medium found ->
1137 like a cd tray empty)
1139 if(errno
!= ENXIO
&& errno
!= ENOMEDIUM
)
1140 fprintf(stderr
, "failed to read %s: %s\n",
1141 fullpath
, strerror(errno
));
1144 ret
= btrfs_scan_one_device(fd
, fullpath
, &tmp_devices
,
1146 BTRFS_SUPER_INFO_OFFSET
);
1147 if (ret
== 0 && run_ioctl
> 0) {
1148 btrfs_register_one_device(fullpath
);
1152 if (!list_empty(&pending_list
)) {
1154 pending
= list_entry(pending_list
.next
, struct pending_dir
,
1157 list_del(&pending
->list
);
1166 while (!list_empty(&pending_list
)) {
1167 pending
= list_entry(pending_list
.next
, struct pending_dir
,
1169 list_del(&pending
->list
);
1177 int btrfs_scan_for_fsid(int run_ioctls
)
1181 ret
= scan_for_btrfs(BTRFS_SCAN_PROC
, run_ioctls
);
1183 ret
= scan_for_btrfs(BTRFS_SCAN_DEV
, run_ioctls
);
1187 int btrfs_device_already_in_root(struct btrfs_root
*root
, int fd
,
1190 struct btrfs_super_block
*disk_super
;
1194 buf
= malloc(BTRFS_SUPER_INFO_SIZE
);
1199 ret
= pread(fd
, buf
, BTRFS_SUPER_INFO_SIZE
, super_offset
);
1200 if (ret
!= BTRFS_SUPER_INFO_SIZE
)
1204 disk_super
= (struct btrfs_super_block
*)buf
;
1205 if (btrfs_super_magic(disk_super
) != BTRFS_MAGIC
)
1208 if (!memcmp(disk_super
->fsid
, root
->fs_info
->super_copy
->fsid
,
1217 static char *size_strs
[] = { "", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1218 int pretty_size_snprintf(u64 size
, char *str
, size_t str_bytes
)
1230 u64 last_size
= size
;
1232 while(size
>= 1024){
1238 if (num_divs
>= ARRAY_SIZE(size_strs
)) {
1242 fraction
= (float)last_size
/ 1024;
1244 return snprintf(str
, str_bytes
, "%.2f%s", fraction
,
1245 size_strs
[num_divs
]);
1249 * __strncpy__null - strncpy with null termination
1250 * @dest: the target array
1251 * @src: the source string
1252 * @n: maximum bytes to copy (size of *dest)
1254 * Like strncpy, but ensures destination is null-terminated.
1256 * Copies the string pointed to by src, including the terminating null
1257 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1258 * of n bytes. Then ensure that dest is null-terminated.
1260 char *__strncpy__null(char *dest
, const char *src
, size_t n
)
1262 strncpy(dest
, src
, n
);
1269 * Checks to make sure that the label matches our requirements.
1271 0 if everything is safe and usable
1272 -1 if the label is too long
1274 static int check_label(const char *input
)
1276 int len
= strlen(input
);
1278 if (len
> BTRFS_LABEL_SIZE
- 1) {
1279 fprintf(stderr
, "ERROR: Label %s is too long (max %d)\n",
1280 input
, BTRFS_LABEL_SIZE
- 1);
1287 static int set_label_unmounted(const char *dev
, const char *label
)
1289 struct btrfs_trans_handle
*trans
;
1290 struct btrfs_root
*root
;
1293 ret
= check_mounted(dev
);
1295 fprintf(stderr
, "FATAL: error checking %s mount status\n", dev
);
1299 fprintf(stderr
, "ERROR: dev %s is mounted, use mount point\n",
1304 /* Open the super_block at the default location
1305 * and as read-write.
1307 root
= open_ctree(dev
, 0, OPEN_CTREE_WRITES
);
1308 if (!root
) /* errors are printed by open_ctree() */
1311 trans
= btrfs_start_transaction(root
, 1);
1312 snprintf(root
->fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
, "%s",
1314 btrfs_commit_transaction(trans
, root
);
1316 /* Now we close it since we are done. */
1321 static int set_label_mounted(const char *mount_path
, const char *label
)
1325 fd
= open(mount_path
, O_RDONLY
| O_NOATIME
);
1327 fprintf(stderr
, "ERROR: unable access to '%s'\n", mount_path
);
1331 if (ioctl(fd
, BTRFS_IOC_SET_FSLABEL
, label
) < 0) {
1332 fprintf(stderr
, "ERROR: unable to set label %s\n",
1342 static int get_label_unmounted(const char *dev
)
1344 struct btrfs_root
*root
;
1347 ret
= check_mounted(dev
);
1349 fprintf(stderr
, "FATAL: error checking %s mount status\n", dev
);
1353 fprintf(stderr
, "ERROR: dev %s is mounted, use mount point\n",
1358 /* Open the super_block at the default location
1361 root
= open_ctree(dev
, 0, 0);
1365 fprintf(stdout
, "%s\n", root
->fs_info
->super_copy
->label
);
1367 /* Now we close it since we are done. */
1373 * If a partition is mounted, try to get the filesystem label via its
1374 * mounted path rather than device. Return the corresponding error
1375 * the user specified the device path.
1377 int get_label_mounted(const char *mount_path
, char *labelp
)
1379 char label
[BTRFS_LABEL_SIZE
];
1382 fd
= open(mount_path
, O_RDONLY
| O_NOATIME
);
1384 fprintf(stderr
, "ERROR: unable access to '%s'\n", mount_path
);
1388 memset(label
, '\0', sizeof(label
));
1389 if (ioctl(fd
, BTRFS_IOC_GET_FSLABEL
, label
) < 0) {
1390 fprintf(stderr
, "ERROR: unable get label %s\n", strerror(errno
));
1395 strncpy(labelp
, label
, sizeof(label
));
1400 int get_label(const char *btrfs_dev
)
1403 char label
[BTRFS_LABEL_SIZE
];
1405 if (is_existing_blk_or_reg_file(btrfs_dev
))
1406 ret
= get_label_unmounted(btrfs_dev
);
1408 ret
= get_label_mounted(btrfs_dev
, label
);
1410 fprintf(stdout
, "%s\n", label
);
1415 int set_label(const char *btrfs_dev
, const char *label
)
1417 if (check_label(label
))
1420 return is_existing_blk_or_reg_file(btrfs_dev
) ?
1421 set_label_unmounted(btrfs_dev
, label
) :
1422 set_label_mounted(btrfs_dev
, label
);
1425 int btrfs_scan_block_devices(int run_ioctl
)
1431 struct btrfs_fs_devices
*tmp_devices
;
1433 FILE *proc_partitions
;
1441 proc_partitions
= fopen("/proc/partitions","r");
1442 if (!proc_partitions
) {
1443 fprintf(stderr
, "Unable to open '/proc/partitions' for scanning\n");
1446 /* skip the header */
1447 for (i
= 0; i
< 2; i
++)
1448 if (!fgets(buf
, 1023, proc_partitions
)) {
1450 "Unable to read '/proc/partitions' for scanning\n");
1451 fclose(proc_partitions
);
1455 strcpy(fullpath
,"/dev/");
1456 while(fgets(buf
, 1023, proc_partitions
)) {
1457 i
= sscanf(buf
," %*d %*d %*d %99s", fullpath
+5);
1460 * multipath and MD devices may register as a btrfs filesystem
1461 * both through the original block device and through
1462 * the special (/dev/mapper or /dev/mdX) entry.
1463 * This scans the special entries last
1465 special
= strncmp(fullpath
, "/dev/dm-", strlen("/dev/dm-")) == 0;
1467 special
= strncmp(fullpath
, "/dev/md", strlen("/dev/md")) == 0;
1469 if (scans
== 0 && special
)
1471 if (scans
> 0 && !special
)
1474 ret
= lstat(fullpath
, &st
);
1476 fprintf(stderr
, "failed to stat %s\n", fullpath
);
1479 if (!S_ISBLK(st
.st_mode
)) {
1483 fd
= open(fullpath
, O_RDONLY
);
1485 if (errno
!= ENOMEDIUM
)
1486 fprintf(stderr
, "failed to open %s: %s\n",
1487 fullpath
, strerror(errno
));
1490 ret
= btrfs_scan_one_device(fd
, fullpath
, &tmp_devices
,
1492 BTRFS_SUPER_INFO_OFFSET
);
1493 if (ret
== 0 && run_ioctl
> 0) {
1494 btrfs_register_one_device(fullpath
);
1499 fclose(proc_partitions
);
1508 u64
parse_size(char *s
)
1514 for (i
= 0; s
&& s
[i
] && isdigit(s
[i
]); i
++) ;
1516 fprintf(stderr
, "ERROR: size value is empty\n");
1544 fprintf(stderr
, "ERROR: Unknown size descriptor "
1549 if (s
[i
] && s
[i
+1]) {
1550 fprintf(stderr
, "ERROR: Illegal suffix contains "
1551 "character '%c' in wrong position\n",
1555 return strtoull(s
, NULL
, 10) * mult
;
1558 int open_file_or_dir(const char *fname
, DIR **dirstream
)
1564 ret
= stat(fname
, &st
);
1568 if (S_ISDIR(st
.st_mode
)) {
1569 *dirstream
= opendir(fname
);
1572 fd
= dirfd(*dirstream
);
1574 fd
= open(fname
, O_RDWR
);
1579 closedir(*dirstream
);
1584 void close_file_or_dir(int fd
, DIR *dirstream
)
1587 closedir(dirstream
);
1592 static int get_device_info(int fd
, u64 devid
,
1593 struct btrfs_ioctl_dev_info_args
*di_args
)
1597 di_args
->devid
= devid
;
1598 memset(&di_args
->uuid
, '\0', sizeof(di_args
->uuid
));
1600 ret
= ioctl(fd
, BTRFS_IOC_DEV_INFO
, di_args
);
1601 return ret
? -errno
: 0;
1605 * For a given path, fill in the ioctl fs_ and info_ args.
1606 * If the path is a btrfs mountpoint, fill info for all devices.
1607 * If the path is a btrfs device, fill in only that device.
1609 * The path provided must be either on a mounted btrfs fs,
1610 * or be a mounted btrfs device.
1612 * Returns 0 on success, or a negative errno.
1614 int get_fs_info(char *path
, struct btrfs_ioctl_fs_info_args
*fi_args
,
1615 struct btrfs_ioctl_dev_info_args
**di_ret
)
1621 struct btrfs_fs_devices
*fs_devices_mnt
= NULL
;
1622 struct btrfs_ioctl_dev_info_args
*di_args
;
1623 char mp
[BTRFS_PATH_NAME_MAX
+ 1];
1624 DIR *dirstream
= NULL
;
1626 memset(fi_args
, 0, sizeof(*fi_args
));
1628 if (is_block_device(path
)) {
1629 /* Ensure it's mounted, then set path to the mountpoint */
1630 fd
= open(path
, O_RDONLY
);
1633 fprintf(stderr
, "Couldn't open %s: %s\n",
1634 path
, strerror(errno
));
1637 ret
= check_mounted_where(fd
, path
, mp
, sizeof(mp
),
1646 /* Only fill in this one device */
1647 fi_args
->num_devices
= 1;
1648 fi_args
->max_id
= fs_devices_mnt
->latest_devid
;
1649 i
= fs_devices_mnt
->latest_devid
;
1650 memcpy(fi_args
->fsid
, fs_devices_mnt
->fsid
, BTRFS_FSID_SIZE
);
1654 /* at this point path must not be for a block device */
1655 fd
= open_file_or_dir(path
, &dirstream
);
1661 /* fill in fi_args if not just a single device */
1662 if (fi_args
->num_devices
!= 1) {
1663 ret
= ioctl(fd
, BTRFS_IOC_FS_INFO
, fi_args
);
1670 if (!fi_args
->num_devices
)
1673 di_args
= *di_ret
= malloc(fi_args
->num_devices
* sizeof(*di_args
));
1679 for (; i
<= fi_args
->max_id
; ++i
) {
1680 BUG_ON(ndevs
>= fi_args
->num_devices
);
1681 ret
= get_device_info(fd
, i
, &di_args
[ndevs
]);
1692 close_file_or_dir(fd
, dirstream
);
1696 #define isoctal(c) (((c) & ~7) == '0')
1698 static inline void translate(char *f
, char *t
)
1700 while (*f
!= '\0') {
1702 isoctal(f
[1]) && isoctal(f
[2]) && isoctal(f
[3])) {
1703 *t
++ = 64*(f
[1] & 7) + 8*(f
[2] & 7) + (f
[3] & 7);
1713 * Checks if the swap device.
1714 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
1716 static int is_swap_device(const char *file
)
1727 if (stat(file
, &st_buf
) < 0)
1729 if (S_ISBLK(st_buf
.st_mode
))
1730 dev
= st_buf
.st_rdev
;
1731 else if (S_ISREG(st_buf
.st_mode
)) {
1732 dev
= st_buf
.st_dev
;
1733 ino
= st_buf
.st_ino
;
1737 if ((f
= fopen("/proc/swaps", "r")) == NULL
)
1740 /* skip the first line */
1741 if (fgets(tmp
, sizeof(tmp
), f
) == NULL
)
1744 while (fgets(tmp
, sizeof(tmp
), f
) != NULL
) {
1745 if ((cp
= strchr(tmp
, ' ')) != NULL
)
1747 if ((cp
= strchr(tmp
, '\t')) != NULL
)
1749 translate(tmp
, buf
);
1750 if (stat(buf
, &st_buf
) != 0)
1752 if (S_ISBLK(st_buf
.st_mode
)) {
1753 if (dev
== st_buf
.st_rdev
) {
1757 } else if (S_ISREG(st_buf
.st_mode
)) {
1758 if (dev
== st_buf
.st_dev
&& ino
== st_buf
.st_ino
) {
1772 * Check for existing filesystem or partition table on device.
1774 * 1 for existing fs or partition
1775 * 0 for nothing found
1776 * -1 for internal error
1783 blkid_probe pr
= NULL
;
1787 if (!device
|| !*device
)
1790 ret
= -1; /* will reset on success of all setup calls */
1792 pr
= blkid_new_probe_from_filename(device
);
1796 size
= blkid_probe_get_size(pr
);
1800 /* nothing to overwrite on a 0-length device */
1806 ret
= blkid_probe_enable_partitions(pr
, 1);
1810 ret
= blkid_do_fullprobe(pr
);
1815 * Blkid returns 1 for nothing found and 0 when it finds a signature,
1816 * but we want the exact opposite, so reverse the return value here.
1818 * In addition print some useful diagnostics about what actually is
1826 if (!blkid_probe_lookup_value(pr
, "TYPE", &type
, NULL
)) {
1828 "%s appears to contain an existing "
1829 "filesystem (%s).\n", device
, type
);
1830 } else if (!blkid_probe_lookup_value(pr
, "PTTYPE", &type
, NULL
)) {
1832 "%s appears to contain a partition "
1833 "table (%s).\n", device
, type
);
1836 "%s appears to contain something weird "
1837 "according to blkid\n", device
);
1843 blkid_free_probe(pr
);
1846 "probe of %s failed, cannot detect "
1847 "existing filesystem.\n", device
);
1851 int test_num_disk_vs_raid(u64 metadata_profile
, u64 data_profile
,
1852 u64 dev_cnt
, int mixed
, char *estr
)
1860 allowed
|= BTRFS_BLOCK_GROUP_RAID10
;
1862 allowed
|= BTRFS_BLOCK_GROUP_RAID6
;
1864 allowed
|= BTRFS_BLOCK_GROUP_RAID0
| BTRFS_BLOCK_GROUP_RAID1
|
1865 BTRFS_BLOCK_GROUP_RAID5
;
1868 allowed
|= BTRFS_BLOCK_GROUP_DUP
;
1871 if (metadata_profile
& ~allowed
) {
1872 snprintf(estr
, sz
, "unable to create FS with metadata "
1873 "profile %llu (have %llu devices)\n",
1874 metadata_profile
, dev_cnt
);
1877 if (data_profile
& ~allowed
) {
1878 snprintf(estr
, sz
, "unable to create FS with data "
1879 "profile %llu (have %llu devices)\n",
1880 metadata_profile
, dev_cnt
);
1884 if (!mixed
&& (data_profile
& BTRFS_BLOCK_GROUP_DUP
)) {
1886 "dup for data is allowed only in mixed mode");
1892 /* Check if disk is suitable for btrfs
1894 * 1: something is wrong, estr provides the error
1897 int test_dev_for_mkfs(char *file
, int force_overwrite
, char *estr
)
1903 ret
= is_swap_device(file
);
1905 snprintf(estr
, sz
, "error checking %s status: %s\n", file
,
1910 snprintf(estr
, sz
, "%s is a swap device\n", file
);
1913 if (!force_overwrite
) {
1914 if (check_overwrite(file
)) {
1915 snprintf(estr
, sz
, "Use the -f option to force overwrite.\n");
1919 ret
= check_mounted(file
);
1921 snprintf(estr
, sz
, "error checking %s mount status\n",
1926 snprintf(estr
, sz
, "%s is mounted\n", file
);
1929 /* check if the device is busy */
1930 fd
= open(file
, O_RDWR
|O_EXCL
);
1932 snprintf(estr
, sz
, "unable to open %s: %s\n", file
,
1936 if (fstat(fd
, &st
)) {
1937 snprintf(estr
, sz
, "unable to stat %s: %s\n", file
,
1942 if (!S_ISBLK(st
.st_mode
)) {
1943 fprintf(stderr
, "'%s' is not a block device\n", file
);
1951 int test_skip_this_disk(char *path
)
1956 * this will eliminate disks which are mounted (btrfs)
1957 * and non-dm disk path when dm is enabled
1959 fd
= open(path
, O_RDWR
|O_EXCL
);
1966 int btrfs_scan_lblkid(int update_kernel
)
1971 struct btrfs_fs_devices
*tmp_devices
;
1972 blkid_dev_iterate iter
= NULL
;
1973 blkid_dev dev
= NULL
;
1974 blkid_cache cache
= NULL
;
1975 char path
[PATH_MAX
];
1977 if (blkid_get_cache(&cache
, 0) < 0) {
1978 printf("ERROR: lblkid cache get failed\n");
1981 blkid_probe_all(cache
);
1982 iter
= blkid_dev_iterate_begin(cache
);
1983 blkid_dev_set_search(iter
, "TYPE", "btrfs");
1984 while (blkid_dev_next(iter
, &dev
) == 0) {
1985 dev
= blkid_verify(cache
, dev
);
1988 /* if we are here its definitely a btrfs disk*/
1989 strncpy(path
, blkid_dev_devname(dev
), PATH_MAX
);
1990 if (test_skip_this_disk(path
))
1993 fd
= open(path
, O_RDONLY
);
1995 printf("ERROR: could not open %s\n", path
);
1998 ret
= btrfs_scan_one_device(fd
, path
, &tmp_devices
,
1999 &num_devices
, BTRFS_SUPER_INFO_OFFSET
);
2001 printf("ERROR: could not scan %s\n", path
);
2008 btrfs_register_one_device(path
);
2010 blkid_dev_iterate_end(iter
);
2015 * scans devs for the btrfs
2017 int scan_for_btrfs(int where
, int update_kernel
)
2022 case BTRFS_SCAN_PROC
:
2023 ret
= btrfs_scan_block_devices(update_kernel
);
2025 case BTRFS_SCAN_DEV
:
2026 ret
= btrfs_scan_one_dir("/dev", update_kernel
);
2028 case BTRFS_SCAN_LBLKID
:
2029 ret
= btrfs_scan_lblkid(update_kernel
);
2035 int is_vol_small(char *file
)
2042 fd
= open(file
, O_RDONLY
);
2045 if (fstat(fd
, &st
) < 0) {
2050 size
= btrfs_device_size(fd
, &st
);
2055 if (size
< 1024 * 1024 * 1024) {
2065 * This reads a line from the stdin and only returns non-zero if the
2066 * first whitespace delimited token is a case insensitive match with yes
2069 int ask_user(char *question
)
2071 char buf
[30] = {0,};
2072 char *saveptr
= NULL
;
2075 printf("%s [y/N]: ", question
);
2077 return fgets(buf
, sizeof(buf
) - 1, stdin
) &&
2078 (answer
= strtok_r(buf
, " \t\n\r", &saveptr
)) &&
2079 (!strcasecmp(answer
, "yes") || !strcasecmp(answer
, "y"));
2084 * - file or directory return the containing tree root id
2085 * - subvolume return it's own tree id
2086 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2087 * undefined and function returns -1
2089 int lookup_ino_rootid(int fd
, u64
*rootid
)
2091 struct btrfs_ioctl_ino_lookup_args args
;
2095 memset(&args
, 0, sizeof(args
));
2097 args
.objectid
= BTRFS_FIRST_FREE_OBJECTID
;
2099 ret
= ioctl(fd
, BTRFS_IOC_INO_LOOKUP
, &args
);
2102 fprintf(stderr
, "ERROR: Failed to lookup root id - %s\n",
2107 *rootid
= args
.treeid
;