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.
23 #include <sys/ioctl.h>
24 #include <sys/mount.h>
25 #include <sys/types.h>
27 #include <uuid/uuid.h>
32 #include <linux/loop.h>
33 #include <linux/major.h>
34 #include <linux/kdev_t.h>
36 #include <blkid/blkid.h>
38 #include <sys/statfs.h>
39 #include <linux/magic.h>
42 #include "kerncompat.h"
43 #include "radix-tree.h"
46 #include "transaction.h"
54 #define BLKDISCARD _IO(0x12,119)
57 static int btrfs_scan_done
= 0;
59 static char argv0_buf
[ARGV0_BUF_SIZE
] = "btrfs";
61 const char *get_argv0_buf(void)
66 void fixup_argv0(char **argv
, const char *token
)
68 int len
= strlen(argv0_buf
);
70 snprintf(argv0_buf
+ len
, sizeof(argv0_buf
) - len
, " %s", token
);
74 void set_argv0(char **argv
)
76 strncpy(argv0_buf
, argv
[0], sizeof(argv0_buf
));
77 argv0_buf
[sizeof(argv0_buf
) - 1] = 0;
80 int check_argc_exact(int nargs
, int expected
)
83 fprintf(stderr
, "%s: too few arguments\n", argv0_buf
);
85 fprintf(stderr
, "%s: too many arguments\n", argv0_buf
);
87 return nargs
!= expected
;
90 int check_argc_min(int nargs
, int expected
)
92 if (nargs
< expected
) {
93 fprintf(stderr
, "%s: too few arguments\n", argv0_buf
);
100 int check_argc_max(int nargs
, int expected
)
102 if (nargs
> expected
) {
103 fprintf(stderr
, "%s: too many arguments\n", argv0_buf
);
112 * Discard the given range in one go
114 static int discard_range(int fd
, u64 start
, u64 len
)
116 u64 range
[2] = { start
, len
};
118 if (ioctl(fd
, BLKDISCARD
, &range
) < 0)
124 * Discard blocks in the given range in 1G chunks, the process is interruptible
126 static int discard_blocks(int fd
, u64 start
, u64 len
)
130 u64 chunk_size
= min_t(u64
, len
, 1*1024*1024*1024);
133 ret
= discard_range(fd
, start
, chunk_size
);
143 static u64 reference_root_table
[] = {
144 [1] = BTRFS_ROOT_TREE_OBJECTID
,
145 [2] = BTRFS_EXTENT_TREE_OBJECTID
,
146 [3] = BTRFS_CHUNK_TREE_OBJECTID
,
147 [4] = BTRFS_DEV_TREE_OBJECTID
,
148 [5] = BTRFS_FS_TREE_OBJECTID
,
149 [6] = BTRFS_CSUM_TREE_OBJECTID
,
152 int test_uuid_unique(char *fs_uuid
)
155 blkid_dev_iterate iter
= NULL
;
156 blkid_dev dev
= NULL
;
157 blkid_cache cache
= NULL
;
159 if (blkid_get_cache(&cache
, NULL
) < 0) {
160 printf("ERROR: lblkid cache get failed\n");
163 blkid_probe_all(cache
);
164 iter
= blkid_dev_iterate_begin(cache
);
165 blkid_dev_set_search(iter
, "UUID", fs_uuid
);
167 while (blkid_dev_next(iter
, &dev
) == 0) {
168 dev
= blkid_verify(cache
, dev
);
175 blkid_dev_iterate_end(iter
);
176 blkid_put_cache(cache
);
182 * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
184 int make_btrfs(int fd
, struct btrfs_mkfs_config
*cfg
)
186 struct btrfs_super_block super
;
187 struct extent_buffer
*buf
;
188 struct btrfs_root_item root_item
;
189 struct btrfs_disk_key disk_key
;
190 struct btrfs_extent_item
*extent_item
;
191 struct btrfs_inode_item
*inode_item
;
192 struct btrfs_chunk
*chunk
;
193 struct btrfs_dev_item
*dev_item
;
194 struct btrfs_dev_extent
*dev_extent
;
195 u8 chunk_tree_uuid
[BTRFS_UUID_SIZE
];
205 int skinny_metadata
= !!(cfg
->features
&
206 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA
);
209 buf
= malloc(sizeof(*buf
) + max(cfg
->sectorsize
, cfg
->nodesize
));
213 first_free
= BTRFS_SUPER_INFO_OFFSET
+ cfg
->sectorsize
* 2 - 1;
214 first_free
&= ~((u64
)cfg
->sectorsize
- 1);
216 memset(&super
, 0, sizeof(super
));
218 num_bytes
= (cfg
->num_bytes
/ cfg
->sectorsize
) * cfg
->sectorsize
;
219 if (cfg
->fs_uuid
&& *cfg
->fs_uuid
) {
220 if (uuid_parse(cfg
->fs_uuid
, super
.fsid
) != 0) {
221 fprintf(stderr
, "could not parse UUID: %s\n",
226 if (!test_uuid_unique(cfg
->fs_uuid
)) {
227 fprintf(stderr
, "non-unique UUID: %s\n", cfg
->fs_uuid
);
232 uuid_generate(super
.fsid
);
234 uuid_unparse(super
.fsid
, cfg
->fs_uuid
);
236 uuid_generate(super
.dev_item
.uuid
);
237 uuid_generate(chunk_tree_uuid
);
239 btrfs_set_super_bytenr(&super
, cfg
->blocks
[0]);
240 btrfs_set_super_num_devices(&super
, 1);
241 btrfs_set_super_magic(&super
, BTRFS_MAGIC
);
242 btrfs_set_super_generation(&super
, 1);
243 btrfs_set_super_root(&super
, cfg
->blocks
[1]);
244 btrfs_set_super_chunk_root(&super
, cfg
->blocks
[3]);
245 btrfs_set_super_total_bytes(&super
, num_bytes
);
246 btrfs_set_super_bytes_used(&super
, 6 * cfg
->nodesize
);
247 btrfs_set_super_sectorsize(&super
, cfg
->sectorsize
);
248 btrfs_set_super_leafsize(&super
, cfg
->nodesize
);
249 btrfs_set_super_nodesize(&super
, cfg
->nodesize
);
250 btrfs_set_super_stripesize(&super
, cfg
->stripesize
);
251 btrfs_set_super_csum_type(&super
, BTRFS_CSUM_TYPE_CRC32
);
252 btrfs_set_super_chunk_root_generation(&super
, 1);
253 btrfs_set_super_cache_generation(&super
, -1);
254 btrfs_set_super_incompat_flags(&super
, cfg
->features
);
256 strncpy(super
.label
, cfg
->label
, BTRFS_LABEL_SIZE
- 1);
258 /* create the tree of root objects */
259 memset(buf
->data
, 0, cfg
->nodesize
);
260 buf
->len
= cfg
->nodesize
;
261 btrfs_set_header_bytenr(buf
, cfg
->blocks
[1]);
262 btrfs_set_header_nritems(buf
, 4);
263 btrfs_set_header_generation(buf
, 1);
264 btrfs_set_header_backref_rev(buf
, BTRFS_MIXED_BACKREF_REV
);
265 btrfs_set_header_owner(buf
, BTRFS_ROOT_TREE_OBJECTID
);
266 write_extent_buffer(buf
, super
.fsid
, btrfs_header_fsid(),
269 write_extent_buffer(buf
, chunk_tree_uuid
,
270 btrfs_header_chunk_tree_uuid(buf
),
273 /* create the items for the root tree */
274 memset(&root_item
, 0, sizeof(root_item
));
275 inode_item
= &root_item
.inode
;
276 btrfs_set_stack_inode_generation(inode_item
, 1);
277 btrfs_set_stack_inode_size(inode_item
, 3);
278 btrfs_set_stack_inode_nlink(inode_item
, 1);
279 btrfs_set_stack_inode_nbytes(inode_item
, cfg
->nodesize
);
280 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
281 btrfs_set_root_refs(&root_item
, 1);
282 btrfs_set_root_used(&root_item
, cfg
->nodesize
);
283 btrfs_set_root_generation(&root_item
, 1);
285 memset(&disk_key
, 0, sizeof(disk_key
));
286 btrfs_set_disk_key_type(&disk_key
, BTRFS_ROOT_ITEM_KEY
);
287 btrfs_set_disk_key_offset(&disk_key
, 0);
290 itemoff
= __BTRFS_LEAF_DATA_SIZE(cfg
->nodesize
) - sizeof(root_item
);
291 btrfs_set_root_bytenr(&root_item
, cfg
->blocks
[2]);
292 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_EXTENT_TREE_OBJECTID
);
293 btrfs_set_item_key(buf
, &disk_key
, nritems
);
294 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
295 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
297 write_extent_buffer(buf
, &root_item
, btrfs_item_ptr_offset(buf
,
298 nritems
), sizeof(root_item
));
301 itemoff
= itemoff
- sizeof(root_item
);
302 btrfs_set_root_bytenr(&root_item
, cfg
->blocks
[4]);
303 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_DEV_TREE_OBJECTID
);
304 btrfs_set_item_key(buf
, &disk_key
, nritems
);
305 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
306 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
308 write_extent_buffer(buf
, &root_item
,
309 btrfs_item_ptr_offset(buf
, nritems
),
313 itemoff
= itemoff
- sizeof(root_item
);
314 btrfs_set_root_bytenr(&root_item
, cfg
->blocks
[5]);
315 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_FS_TREE_OBJECTID
);
316 btrfs_set_item_key(buf
, &disk_key
, nritems
);
317 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
318 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
320 write_extent_buffer(buf
, &root_item
,
321 btrfs_item_ptr_offset(buf
, nritems
),
325 itemoff
= itemoff
- sizeof(root_item
);
326 btrfs_set_root_bytenr(&root_item
, cfg
->blocks
[6]);
327 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_CSUM_TREE_OBJECTID
);
328 btrfs_set_item_key(buf
, &disk_key
, nritems
);
329 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
330 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
332 write_extent_buffer(buf
, &root_item
,
333 btrfs_item_ptr_offset(buf
, nritems
),
338 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
339 ret
= pwrite(fd
, buf
->data
, cfg
->nodesize
, cfg
->blocks
[1]);
340 if (ret
!= cfg
->nodesize
) {
341 ret
= (ret
< 0 ? -errno
: -EIO
);
345 /* create the items for the extent tree */
346 memset(buf
->data
+ sizeof(struct btrfs_header
), 0,
347 cfg
->nodesize
- sizeof(struct btrfs_header
));
349 itemoff
= __BTRFS_LEAF_DATA_SIZE(cfg
->nodesize
);
350 for (i
= 1; i
< 7; i
++) {
351 item_size
= sizeof(struct btrfs_extent_item
);
352 if (!skinny_metadata
)
353 item_size
+= sizeof(struct btrfs_tree_block_info
);
355 BUG_ON(cfg
->blocks
[i
] < first_free
);
356 BUG_ON(cfg
->blocks
[i
] < cfg
->blocks
[i
- 1]);
358 /* create extent item */
359 itemoff
-= item_size
;
360 btrfs_set_disk_key_objectid(&disk_key
, cfg
->blocks
[i
]);
361 if (skinny_metadata
) {
362 btrfs_set_disk_key_type(&disk_key
,
363 BTRFS_METADATA_ITEM_KEY
);
364 btrfs_set_disk_key_offset(&disk_key
, 0);
366 btrfs_set_disk_key_type(&disk_key
,
367 BTRFS_EXTENT_ITEM_KEY
);
368 btrfs_set_disk_key_offset(&disk_key
, cfg
->nodesize
);
370 btrfs_set_item_key(buf
, &disk_key
, nritems
);
371 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
),
373 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
375 extent_item
= btrfs_item_ptr(buf
, nritems
,
376 struct btrfs_extent_item
);
377 btrfs_set_extent_refs(buf
, extent_item
, 1);
378 btrfs_set_extent_generation(buf
, extent_item
, 1);
379 btrfs_set_extent_flags(buf
, extent_item
,
380 BTRFS_EXTENT_FLAG_TREE_BLOCK
);
383 /* create extent ref */
384 ref_root
= reference_root_table
[i
];
385 btrfs_set_disk_key_objectid(&disk_key
, cfg
->blocks
[i
]);
386 btrfs_set_disk_key_offset(&disk_key
, ref_root
);
387 btrfs_set_disk_key_type(&disk_key
, BTRFS_TREE_BLOCK_REF_KEY
);
388 btrfs_set_item_key(buf
, &disk_key
, nritems
);
389 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
),
391 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
), 0);
394 btrfs_set_header_bytenr(buf
, cfg
->blocks
[2]);
395 btrfs_set_header_owner(buf
, BTRFS_EXTENT_TREE_OBJECTID
);
396 btrfs_set_header_nritems(buf
, nritems
);
397 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
398 ret
= pwrite(fd
, buf
->data
, cfg
->nodesize
, cfg
->blocks
[2]);
399 if (ret
!= cfg
->nodesize
) {
400 ret
= (ret
< 0 ? -errno
: -EIO
);
404 /* create the chunk tree */
405 memset(buf
->data
+ sizeof(struct btrfs_header
), 0,
406 cfg
->nodesize
- sizeof(struct btrfs_header
));
408 item_size
= sizeof(*dev_item
);
409 itemoff
= __BTRFS_LEAF_DATA_SIZE(cfg
->nodesize
) - item_size
;
411 /* first device 1 (there is no device 0) */
412 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_DEV_ITEMS_OBJECTID
);
413 btrfs_set_disk_key_offset(&disk_key
, 1);
414 btrfs_set_disk_key_type(&disk_key
, BTRFS_DEV_ITEM_KEY
);
415 btrfs_set_item_key(buf
, &disk_key
, nritems
);
416 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
417 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
), item_size
);
419 dev_item
= btrfs_item_ptr(buf
, nritems
, struct btrfs_dev_item
);
420 btrfs_set_device_id(buf
, dev_item
, 1);
421 btrfs_set_device_generation(buf
, dev_item
, 0);
422 btrfs_set_device_total_bytes(buf
, dev_item
, num_bytes
);
423 btrfs_set_device_bytes_used(buf
, dev_item
,
424 BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
425 btrfs_set_device_io_align(buf
, dev_item
, cfg
->sectorsize
);
426 btrfs_set_device_io_width(buf
, dev_item
, cfg
->sectorsize
);
427 btrfs_set_device_sector_size(buf
, dev_item
, cfg
->sectorsize
);
428 btrfs_set_device_type(buf
, dev_item
, 0);
430 write_extent_buffer(buf
, super
.dev_item
.uuid
,
431 (unsigned long)btrfs_device_uuid(dev_item
),
433 write_extent_buffer(buf
, super
.fsid
,
434 (unsigned long)btrfs_device_fsid(dev_item
),
436 read_extent_buffer(buf
, &super
.dev_item
, (unsigned long)dev_item
,
440 item_size
= btrfs_chunk_item_size(1);
441 itemoff
= itemoff
- item_size
;
443 /* then we have chunk 0 */
444 btrfs_set_disk_key_objectid(&disk_key
, BTRFS_FIRST_CHUNK_TREE_OBJECTID
);
445 btrfs_set_disk_key_offset(&disk_key
, 0);
446 btrfs_set_disk_key_type(&disk_key
, BTRFS_CHUNK_ITEM_KEY
);
447 btrfs_set_item_key(buf
, &disk_key
, nritems
);
448 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
449 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
), item_size
);
451 chunk
= btrfs_item_ptr(buf
, nritems
, struct btrfs_chunk
);
452 btrfs_set_chunk_length(buf
, chunk
, BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
453 btrfs_set_chunk_owner(buf
, chunk
, BTRFS_EXTENT_TREE_OBJECTID
);
454 btrfs_set_chunk_stripe_len(buf
, chunk
, 64 * 1024);
455 btrfs_set_chunk_type(buf
, chunk
, BTRFS_BLOCK_GROUP_SYSTEM
);
456 btrfs_set_chunk_io_align(buf
, chunk
, cfg
->sectorsize
);
457 btrfs_set_chunk_io_width(buf
, chunk
, cfg
->sectorsize
);
458 btrfs_set_chunk_sector_size(buf
, chunk
, cfg
->sectorsize
);
459 btrfs_set_chunk_num_stripes(buf
, chunk
, 1);
460 btrfs_set_stripe_devid_nr(buf
, chunk
, 0, 1);
461 btrfs_set_stripe_offset_nr(buf
, chunk
, 0, 0);
464 write_extent_buffer(buf
, super
.dev_item
.uuid
,
465 (unsigned long)btrfs_stripe_dev_uuid(&chunk
->stripe
),
468 /* copy the key for the chunk to the system array */
469 ptr
= super
.sys_chunk_array
;
470 array_size
= sizeof(disk_key
);
472 memcpy(ptr
, &disk_key
, sizeof(disk_key
));
473 ptr
+= sizeof(disk_key
);
475 /* copy the chunk to the system array */
476 read_extent_buffer(buf
, ptr
, (unsigned long)chunk
, item_size
);
477 array_size
+= item_size
;
479 btrfs_set_super_sys_array_size(&super
, array_size
);
481 btrfs_set_header_bytenr(buf
, cfg
->blocks
[3]);
482 btrfs_set_header_owner(buf
, BTRFS_CHUNK_TREE_OBJECTID
);
483 btrfs_set_header_nritems(buf
, nritems
);
484 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
485 ret
= pwrite(fd
, buf
->data
, cfg
->nodesize
, cfg
->blocks
[3]);
486 if (ret
!= cfg
->nodesize
) {
487 ret
= (ret
< 0 ? -errno
: -EIO
);
491 /* create the device tree */
492 memset(buf
->data
+ sizeof(struct btrfs_header
), 0,
493 cfg
->nodesize
- sizeof(struct btrfs_header
));
495 itemoff
= __BTRFS_LEAF_DATA_SIZE(cfg
->nodesize
) -
496 sizeof(struct btrfs_dev_extent
);
498 btrfs_set_disk_key_objectid(&disk_key
, 1);
499 btrfs_set_disk_key_offset(&disk_key
, 0);
500 btrfs_set_disk_key_type(&disk_key
, BTRFS_DEV_EXTENT_KEY
);
501 btrfs_set_item_key(buf
, &disk_key
, nritems
);
502 btrfs_set_item_offset(buf
, btrfs_item_nr(nritems
), itemoff
);
503 btrfs_set_item_size(buf
, btrfs_item_nr(nritems
),
504 sizeof(struct btrfs_dev_extent
));
505 dev_extent
= btrfs_item_ptr(buf
, nritems
, struct btrfs_dev_extent
);
506 btrfs_set_dev_extent_chunk_tree(buf
, dev_extent
,
507 BTRFS_CHUNK_TREE_OBJECTID
);
508 btrfs_set_dev_extent_chunk_objectid(buf
, dev_extent
,
509 BTRFS_FIRST_CHUNK_TREE_OBJECTID
);
510 btrfs_set_dev_extent_chunk_offset(buf
, dev_extent
, 0);
512 write_extent_buffer(buf
, chunk_tree_uuid
,
513 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent
),
516 btrfs_set_dev_extent_length(buf
, dev_extent
,
517 BTRFS_MKFS_SYSTEM_GROUP_SIZE
);
520 btrfs_set_header_bytenr(buf
, cfg
->blocks
[4]);
521 btrfs_set_header_owner(buf
, BTRFS_DEV_TREE_OBJECTID
);
522 btrfs_set_header_nritems(buf
, nritems
);
523 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
524 ret
= pwrite(fd
, buf
->data
, cfg
->nodesize
, cfg
->blocks
[4]);
525 if (ret
!= cfg
->nodesize
) {
526 ret
= (ret
< 0 ? -errno
: -EIO
);
530 /* create the FS root */
531 memset(buf
->data
+ sizeof(struct btrfs_header
), 0,
532 cfg
->nodesize
- sizeof(struct btrfs_header
));
533 btrfs_set_header_bytenr(buf
, cfg
->blocks
[5]);
534 btrfs_set_header_owner(buf
, BTRFS_FS_TREE_OBJECTID
);
535 btrfs_set_header_nritems(buf
, 0);
536 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
537 ret
= pwrite(fd
, buf
->data
, cfg
->nodesize
, cfg
->blocks
[5]);
538 if (ret
!= cfg
->nodesize
) {
539 ret
= (ret
< 0 ? -errno
: -EIO
);
542 /* finally create the csum root */
543 memset(buf
->data
+ sizeof(struct btrfs_header
), 0,
544 cfg
->nodesize
- sizeof(struct btrfs_header
));
545 btrfs_set_header_bytenr(buf
, cfg
->blocks
[6]);
546 btrfs_set_header_owner(buf
, BTRFS_CSUM_TREE_OBJECTID
);
547 btrfs_set_header_nritems(buf
, 0);
548 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
549 ret
= pwrite(fd
, buf
->data
, cfg
->nodesize
, cfg
->blocks
[6]);
550 if (ret
!= cfg
->nodesize
) {
551 ret
= (ret
< 0 ? -errno
: -EIO
);
555 /* and write out the super block */
556 BUG_ON(sizeof(super
) > cfg
->sectorsize
);
557 memset(buf
->data
, 0, BTRFS_SUPER_INFO_SIZE
);
558 memcpy(buf
->data
, &super
, sizeof(super
));
559 buf
->len
= BTRFS_SUPER_INFO_SIZE
;
560 csum_tree_block_size(buf
, BTRFS_CRC32_SIZE
, 0);
561 ret
= pwrite(fd
, buf
->data
, BTRFS_SUPER_INFO_SIZE
, cfg
->blocks
[0]);
562 if (ret
!= BTRFS_SUPER_INFO_SIZE
) {
563 ret
= (ret
< 0 ? -errno
: -EIO
);
574 static const struct btrfs_fs_feature
{
578 } mkfs_features
[] = {
579 { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
,
580 "mixed data and metadata block groups" },
581 { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF
,
582 "increased hardlink limit per file to 65536" },
583 { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56
,
584 "raid56 extended format" },
585 { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA
,
586 "reduced-size metadata extent refs" },
587 { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES
,
588 "no explicit hole extents for files" },
589 /* Keep this one last */
590 { "list-all", BTRFS_FEATURE_LIST_ALL
, NULL
}
593 static int parse_one_fs_feature(const char *name
, u64
*flags
)
598 for (i
= 0; i
< ARRAY_SIZE(mkfs_features
); i
++) {
599 if (name
[0] == '^' &&
600 !strcmp(mkfs_features
[i
].name
, name
+ 1)) {
601 *flags
&= ~ mkfs_features
[i
].flag
;
603 } else if (!strcmp(mkfs_features
[i
].name
, name
)) {
604 *flags
|= mkfs_features
[i
].flag
;
612 void btrfs_parse_features_to_string(char *buf
, u64 flags
)
618 for (i
= 0; i
< ARRAY_SIZE(mkfs_features
); i
++) {
619 if (flags
& mkfs_features
[i
].flag
) {
622 strcat(buf
, mkfs_features
[i
].name
);
627 void btrfs_process_fs_features(u64 flags
)
631 for (i
= 0; i
< ARRAY_SIZE(mkfs_features
); i
++) {
632 if (flags
& mkfs_features
[i
].flag
) {
633 printf("Turning ON incompat feature '%s': %s\n",
634 mkfs_features
[i
].name
,
635 mkfs_features
[i
].desc
);
640 void btrfs_list_all_fs_features(u64 mask_disallowed
)
644 fprintf(stderr
, "Filesystem features available:\n");
645 for (i
= 0; i
< ARRAY_SIZE(mkfs_features
) - 1; i
++) {
646 char *is_default
= "";
648 if (mkfs_features
[i
].flag
& mask_disallowed
)
650 if (mkfs_features
[i
].flag
& BTRFS_MKFS_DEFAULT_FEATURES
)
651 is_default
= ", default";
652 fprintf(stderr
, "%-20s- %s (0x%llx%s)\n",
653 mkfs_features
[i
].name
,
654 mkfs_features
[i
].desc
,
655 mkfs_features
[i
].flag
,
661 * Return NULL if all features were parsed fine, otherwise return the name of
662 * the first unparsed.
664 char* btrfs_parse_fs_features(char *namelist
, u64
*flags
)
667 char *save_ptr
= NULL
; /* Satisfy static checkers */
669 for (this_char
= strtok_r(namelist
, ",", &save_ptr
);
671 this_char
= strtok_r(NULL
, ",", &save_ptr
)) {
672 if (parse_one_fs_feature(this_char
, flags
))
679 u64
btrfs_device_size(int fd
, struct stat
*st
)
682 if (S_ISREG(st
->st_mode
)) {
685 if (!S_ISBLK(st
->st_mode
)) {
688 if (ioctl(fd
, BLKGETSIZE64
, &size
) >= 0) {
694 static int zero_blocks(int fd
, off_t start
, size_t len
)
696 char *buf
= malloc(len
);
703 written
= pwrite(fd
, buf
, len
, start
);
710 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
712 /* don't write outside the device by clamping the region to the device size */
713 static int zero_dev_clamped(int fd
, off_t start
, ssize_t len
, u64 dev_size
)
715 off_t end
= max(start
, start
+ len
);
718 /* and don't overwrite the disk labels on sparc */
719 start
= max(start
, 1024);
720 end
= max(end
, 1024);
723 start
= min_t(u64
, start
, dev_size
);
724 end
= min_t(u64
, end
, dev_size
);
726 return zero_blocks(fd
, start
, end
- start
);
729 int btrfs_add_to_fsid(struct btrfs_trans_handle
*trans
,
730 struct btrfs_root
*root
, int fd
, char *path
,
731 u64 device_total_bytes
, u32 io_width
, u32 io_align
,
734 struct btrfs_super_block
*disk_super
;
735 struct btrfs_super_block
*super
= root
->fs_info
->super_copy
;
736 struct btrfs_device
*device
;
737 struct btrfs_dev_item
*dev_item
;
743 device_total_bytes
= (device_total_bytes
/ sectorsize
) * sectorsize
;
745 device
= kzalloc(sizeof(*device
), GFP_NOFS
);
748 buf
= kzalloc(sectorsize
, GFP_NOFS
);
751 BUG_ON(sizeof(*disk_super
) > sectorsize
);
753 disk_super
= (struct btrfs_super_block
*)buf
;
754 dev_item
= &disk_super
->dev_item
;
756 uuid_generate(device
->uuid
);
759 device
->io_width
= io_width
;
760 device
->io_align
= io_align
;
761 device
->sector_size
= sectorsize
;
763 device
->writeable
= 1;
764 device
->total_bytes
= device_total_bytes
;
765 device
->bytes_used
= 0;
766 device
->total_ios
= 0;
767 device
->dev_root
= root
->fs_info
->dev_root
;
768 device
->name
= strdup(path
);
772 INIT_LIST_HEAD(&device
->dev_list
);
773 ret
= btrfs_add_device(trans
, root
, device
);
776 fs_total_bytes
= btrfs_super_total_bytes(super
) + device_total_bytes
;
777 btrfs_set_super_total_bytes(super
, fs_total_bytes
);
779 num_devs
= btrfs_super_num_devices(super
) + 1;
780 btrfs_set_super_num_devices(super
, num_devs
);
782 memcpy(disk_super
, super
, sizeof(*disk_super
));
784 btrfs_set_super_bytenr(disk_super
, BTRFS_SUPER_INFO_OFFSET
);
785 btrfs_set_stack_device_id(dev_item
, device
->devid
);
786 btrfs_set_stack_device_type(dev_item
, device
->type
);
787 btrfs_set_stack_device_io_align(dev_item
, device
->io_align
);
788 btrfs_set_stack_device_io_width(dev_item
, device
->io_width
);
789 btrfs_set_stack_device_sector_size(dev_item
, device
->sector_size
);
790 btrfs_set_stack_device_total_bytes(dev_item
, device
->total_bytes
);
791 btrfs_set_stack_device_bytes_used(dev_item
, device
->bytes_used
);
792 memcpy(&dev_item
->uuid
, device
->uuid
, BTRFS_UUID_SIZE
);
794 ret
= pwrite(fd
, buf
, sectorsize
, BTRFS_SUPER_INFO_OFFSET
);
795 BUG_ON(ret
!= sectorsize
);
798 list_add(&device
->dev_list
, &root
->fs_info
->fs_devices
->devices
);
799 device
->fs_devices
= root
->fs_info
->fs_devices
;
808 static int btrfs_wipe_existing_sb(int fd
)
810 const char *off
= NULL
;
815 blkid_probe pr
= NULL
;
817 pr
= blkid_new_probe();
821 if (blkid_probe_set_device(pr
, fd
, 0, 0)) {
826 ret
= blkid_probe_lookup_value(pr
, "SBMAGIC_OFFSET", &off
, NULL
);
828 ret
= blkid_probe_lookup_value(pr
, "SBMAGIC", NULL
, &len
);
830 if (ret
|| len
== 0 || off
== NULL
) {
832 * If lookup fails, the probe did not find any values, eg. for
833 * a file image or a loop device. Soft error.
839 offset
= strtoll(off
, NULL
, 10);
840 if (len
> sizeof(buf
))
844 ret
= pwrite(fd
, buf
, len
, offset
);
846 fprintf(stderr
, "ERROR: cannot wipe existing superblock\n");
852 blkid_free_probe(pr
);
856 int btrfs_prepare_device(int fd
, char *file
, int zero_end
, u64
*block_count_ret
,
857 u64 max_block_count
, int discard
)
863 ret
= fstat(fd
, &st
);
865 fprintf(stderr
, "unable to stat %s\n", file
);
869 block_count
= btrfs_device_size(fd
, &st
);
870 if (block_count
== 0) {
871 fprintf(stderr
, "unable to find %s size\n", file
);
875 block_count
= min(block_count
, max_block_count
);
879 * We intentionally ignore errors from the discard ioctl. It
880 * is not necessary for the mkfs functionality but just an
883 if (discard_range(fd
, 0, 0) == 0) {
884 printf("Performing full device TRIM (%s) ...\n",
885 pretty_size(block_count
));
886 discard_blocks(fd
, 0, block_count
);
890 ret
= zero_dev_clamped(fd
, 0, ZERO_DEV_BYTES
, block_count
);
891 for (i
= 0 ; !ret
&& i
< BTRFS_SUPER_MIRROR_MAX
; i
++)
892 ret
= zero_dev_clamped(fd
, btrfs_sb_offset(i
),
893 BTRFS_SUPER_INFO_SIZE
, block_count
);
894 if (!ret
&& zero_end
)
895 ret
= zero_dev_clamped(fd
, block_count
- ZERO_DEV_BYTES
,
896 ZERO_DEV_BYTES
, block_count
);
899 fprintf(stderr
, "ERROR: failed to zero device '%s' - %s\n",
900 file
, strerror(-ret
));
904 ret
= btrfs_wipe_existing_sb(fd
);
906 fprintf(stderr
, "ERROR: cannot wipe superblocks on '%s'\n",
911 *block_count_ret
= block_count
;
915 int btrfs_make_root_dir(struct btrfs_trans_handle
*trans
,
916 struct btrfs_root
*root
, u64 objectid
)
919 struct btrfs_inode_item inode_item
;
920 time_t now
= time(NULL
);
922 memset(&inode_item
, 0, sizeof(inode_item
));
923 btrfs_set_stack_inode_generation(&inode_item
, trans
->transid
);
924 btrfs_set_stack_inode_size(&inode_item
, 0);
925 btrfs_set_stack_inode_nlink(&inode_item
, 1);
926 btrfs_set_stack_inode_nbytes(&inode_item
, root
->nodesize
);
927 btrfs_set_stack_inode_mode(&inode_item
, S_IFDIR
| 0755);
928 btrfs_set_stack_timespec_sec(&inode_item
.atime
, now
);
929 btrfs_set_stack_timespec_nsec(&inode_item
.atime
, 0);
930 btrfs_set_stack_timespec_sec(&inode_item
.ctime
, now
);
931 btrfs_set_stack_timespec_nsec(&inode_item
.ctime
, 0);
932 btrfs_set_stack_timespec_sec(&inode_item
.mtime
, now
);
933 btrfs_set_stack_timespec_nsec(&inode_item
.mtime
, 0);
934 btrfs_set_stack_timespec_sec(&inode_item
.otime
, 0);
935 btrfs_set_stack_timespec_nsec(&inode_item
.otime
, 0);
937 if (root
->fs_info
->tree_root
== root
)
938 btrfs_set_super_root_dir(root
->fs_info
->super_copy
, objectid
);
940 ret
= btrfs_insert_inode(trans
, root
, objectid
, &inode_item
);
944 ret
= btrfs_insert_inode_ref(trans
, root
, "..", 2, objectid
, objectid
, 0);
948 btrfs_set_root_dirid(&root
->root_item
, objectid
);
955 * checks if a path is a block device node
956 * Returns negative errno on failure, otherwise
957 * returns 1 for blockdev, 0 for not-blockdev
959 int is_block_device(const char *path
)
963 if (stat(path
, &statbuf
) < 0)
966 return !!S_ISBLK(statbuf
.st_mode
);
970 * check if given path is a mount point
971 * return 1 if yes. 0 if no. -1 for error
973 int is_mount_point(const char *path
)
979 f
= setmntent("/proc/self/mounts", "r");
983 while ((mnt
= getmntent(f
)) != NULL
) {
984 if (strcmp(mnt
->mnt_dir
, path
))
993 static int is_reg_file(const char *path
)
997 if (stat(path
, &statbuf
) < 0)
999 return S_ISREG(statbuf
.st_mode
);
1003 * This function checks if the given input parameter is
1005 * return <0 : some error in the given input
1006 * return BTRFS_ARG_UNKNOWN: unknown input
1007 * return BTRFS_ARG_UUID: given input is uuid
1008 * return BTRFS_ARG_MNTPOINT: given input is path
1009 * return BTRFS_ARG_REG: given input is regular file
1010 * return BTRFS_ARG_BLKDEV: given input is block device
1012 int check_arg_type(const char *input
)
1015 char path
[PATH_MAX
];
1020 if (realpath(input
, path
)) {
1021 if (is_block_device(path
) == 1)
1022 return BTRFS_ARG_BLKDEV
;
1024 if (is_mount_point(path
) == 1)
1025 return BTRFS_ARG_MNTPOINT
;
1027 if (is_reg_file(path
))
1028 return BTRFS_ARG_REG
;
1030 return BTRFS_ARG_UNKNOWN
;
1033 if (strlen(input
) == (BTRFS_UUID_UNPARSED_SIZE
- 1) &&
1034 !uuid_parse(input
, uuid
))
1035 return BTRFS_ARG_UUID
;
1037 return BTRFS_ARG_UNKNOWN
;
1041 * Find the mount point for a mounted device.
1042 * On success, returns 0 with mountpoint in *mp.
1043 * On failure, returns -errno (not mounted yields -EINVAL)
1044 * Is noisy on failures, expects to be given a mounted device.
1046 int get_btrfs_mount(const char *dev
, char *mp
, size_t mp_size
)
1051 ret
= is_block_device(dev
);
1054 fprintf(stderr
, "%s is not a block device\n", dev
);
1057 fprintf(stderr
, "Could not check %s: %s\n",
1058 dev
, strerror(-ret
));
1063 fd
= open(dev
, O_RDONLY
);
1066 fprintf(stderr
, "Could not open %s: %s\n", dev
, strerror(errno
));
1070 ret
= check_mounted_where(fd
, dev
, mp
, mp_size
, NULL
);
1073 } else { /* mounted, all good */
1083 * Given a pathname, return a filehandle to:
1084 * the original pathname or,
1085 * if the pathname is a mounted btrfs device, to its mountpoint.
1087 * On error, return -1, errno should be set.
1089 int open_path_or_dev_mnt(const char *path
, DIR **dirstream
, int verbose
)
1094 if (is_block_device(path
)) {
1095 ret
= get_btrfs_mount(path
, mp
, sizeof(mp
));
1097 /* not a mounted btrfs dev */
1098 error_on(verbose
, "'%s' is not a mounted btrfs device",
1103 ret
= open_file_or_dir(mp
, dirstream
);
1104 error_on(verbose
&& ret
< 0, "can't access '%s': %s",
1105 path
, strerror(errno
));
1107 ret
= btrfs_open_dir(path
, dirstream
, 1);
1114 * Do the following checks before calling open_file_or_dir():
1115 * 1: path is in a btrfs filesystem
1116 * 2: path is a directory
1118 int btrfs_open_dir(const char *path
, DIR **dirstream
, int verbose
)
1124 if (statfs(path
, &stfs
) != 0) {
1127 "ERROR: can't access '%s': %s\n",
1128 path
, strerror(errno
));
1132 if (stfs
.f_type
!= BTRFS_SUPER_MAGIC
) {
1135 "ERROR: not a btrfs filesystem: %s\n",
1140 if (stat(path
, &st
) != 0) {
1143 "ERROR: can't access '%s': %s\n",
1144 path
, strerror(errno
));
1148 if (!S_ISDIR(st
.st_mode
)) {
1151 "ERROR: not a directory: %s\n",
1156 ret
= open_file_or_dir(path
, dirstream
);
1160 "ERROR: can't access '%s': %s\n",
1161 path
, strerror(errno
));
1167 /* checks if a device is a loop device */
1168 static int is_loop_device (const char* device
) {
1169 struct stat statbuf
;
1171 if(stat(device
, &statbuf
) < 0)
1174 return (S_ISBLK(statbuf
.st_mode
) &&
1175 MAJOR(statbuf
.st_rdev
) == LOOP_MAJOR
);
1179 * Takes a loop device path (e.g. /dev/loop0) and returns
1180 * the associated file (e.g. /images/my_btrfs.img) using
1183 static int resolve_loop_device_with_loopdev(const char* loop_dev
, char* loop_file
)
1187 struct loop_info64 lo64
;
1189 fd
= open(loop_dev
, O_RDONLY
| O_NONBLOCK
);
1192 ret
= ioctl(fd
, LOOP_GET_STATUS64
, &lo64
);
1198 memcpy(loop_file
, lo64
.lo_file_name
, sizeof(lo64
.lo_file_name
));
1199 loop_file
[sizeof(lo64
.lo_file_name
)] = 0;
1207 /* Takes a loop device path (e.g. /dev/loop0) and returns
1208 * the associated file (e.g. /images/my_btrfs.img) */
1209 static int resolve_loop_device(const char* loop_dev
, char* loop_file
,
1216 char real_loop_dev
[PATH_MAX
];
1218 if (!realpath(loop_dev
, real_loop_dev
))
1220 snprintf(p
, PATH_MAX
, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev
, '/'));
1221 if (!(f
= fopen(p
, "r"))) {
1222 if (errno
== ENOENT
)
1224 * It's possibly a partitioned loop device, which is
1225 * resolvable with loopdev API.
1227 return resolve_loop_device_with_loopdev(loop_dev
, loop_file
);
1231 snprintf(fmt
, 20, "%%%i[^\n]", max_len
-1);
1232 ret
= fscanf(f
, fmt
, loop_file
);
1241 * Checks whether a and b are identical or device
1242 * files associated with the same block device
1244 static int is_same_blk_file(const char* a
, const char* b
)
1246 struct stat st_buf_a
, st_buf_b
;
1247 char real_a
[PATH_MAX
];
1248 char real_b
[PATH_MAX
];
1250 if (!realpath(a
, real_a
))
1251 strncpy_null(real_a
, a
);
1253 if (!realpath(b
, real_b
))
1254 strncpy_null(real_b
, b
);
1256 /* Identical path? */
1257 if (strcmp(real_a
, real_b
) == 0)
1260 if (stat(a
, &st_buf_a
) < 0 || stat(b
, &st_buf_b
) < 0) {
1261 if (errno
== ENOENT
)
1266 /* Same blockdevice? */
1267 if (S_ISBLK(st_buf_a
.st_mode
) && S_ISBLK(st_buf_b
.st_mode
) &&
1268 st_buf_a
.st_rdev
== st_buf_b
.st_rdev
) {
1273 if (st_buf_a
.st_dev
== st_buf_b
.st_dev
&&
1274 st_buf_a
.st_ino
== st_buf_b
.st_ino
) {
1281 /* checks if a and b are identical or device
1282 * files associated with the same block device or
1283 * if one file is a loop device that uses the other
1286 static int is_same_loop_file(const char* a
, const char* b
)
1288 char res_a
[PATH_MAX
];
1289 char res_b
[PATH_MAX
];
1290 const char* final_a
= NULL
;
1291 const char* final_b
= NULL
;
1294 /* Resolve a if it is a loop device */
1295 if((ret
= is_loop_device(a
)) < 0) {
1300 ret
= resolve_loop_device(a
, res_a
, sizeof(res_a
));
1311 /* Resolve b if it is a loop device */
1312 if ((ret
= is_loop_device(b
)) < 0) {
1317 ret
= resolve_loop_device(b
, res_b
, sizeof(res_b
));
1328 return is_same_blk_file(final_a
, final_b
);
1331 /* Checks if a file exists and is a block or regular file*/
1332 static int is_existing_blk_or_reg_file(const char* filename
)
1336 if(stat(filename
, &st_buf
) < 0) {
1343 return (S_ISBLK(st_buf
.st_mode
) || S_ISREG(st_buf
.st_mode
));
1346 /* Checks if a file is used (directly or indirectly via a loop device)
1347 * by a device in fs_devices
1349 static int blk_file_in_dev_list(struct btrfs_fs_devices
* fs_devices
,
1353 struct list_head
*head
;
1354 struct list_head
*cur
;
1355 struct btrfs_device
*device
;
1357 head
= &fs_devices
->devices
;
1358 list_for_each(cur
, head
) {
1359 device
= list_entry(cur
, struct btrfs_device
, dev_list
);
1361 if((ret
= is_same_loop_file(device
->name
, file
)))
1369 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1370 * Returns NULL on invalid input or malloc failure; Other failures
1371 * will be handled by the caller using the input pathame.
1373 char *canonicalize_dm_name(const char *ptname
)
1377 char path
[PATH_MAX
], name
[PATH_MAX
], *res
= NULL
;
1379 if (!ptname
|| !*ptname
)
1382 snprintf(path
, sizeof(path
), "/sys/block/%s/dm/name", ptname
);
1383 if (!(f
= fopen(path
, "r")))
1386 /* read <name>\n from sysfs */
1387 if (fgets(name
, sizeof(name
), f
) && (sz
= strlen(name
)) > 1) {
1388 name
[sz
- 1] = '\0';
1389 snprintf(path
, sizeof(path
), "/dev/mapper/%s", name
);
1391 if (access(path
, F_OK
) == 0)
1399 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1400 * to a device mapper pathname.
1401 * Returns NULL on invalid input or malloc failure; Other failures
1402 * will be handled by the caller using the input pathame.
1404 char *canonicalize_path(const char *path
)
1406 char *canonical
, *p
;
1408 if (!path
|| !*path
)
1411 canonical
= realpath(path
, NULL
);
1413 return strdup(path
);
1414 p
= strrchr(canonical
, '/');
1415 if (p
&& strncmp(p
, "/dm-", 4) == 0 && isdigit(*(p
+ 4))) {
1416 char *dm
= canonicalize_dm_name(p
+ 1);
1427 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1428 * is safe to continue.
1430 int check_mounted(const char* file
)
1435 fd
= open(file
, O_RDONLY
);
1437 fprintf (stderr
, "check_mounted(): Could not open %s\n", file
);
1441 ret
= check_mounted_where(fd
, file
, NULL
, 0, NULL
);
1447 int check_mounted_where(int fd
, const char *file
, char *where
, int size
,
1448 struct btrfs_fs_devices
**fs_dev_ret
)
1453 struct btrfs_fs_devices
*fs_devices_mnt
= NULL
;
1457 /* scan the initial device */
1458 ret
= btrfs_scan_one_device(fd
, file
, &fs_devices_mnt
,
1459 &total_devs
, BTRFS_SUPER_INFO_OFFSET
, 0);
1460 is_btrfs
= (ret
>= 0);
1462 /* scan other devices */
1463 if (is_btrfs
&& total_devs
> 1) {
1464 ret
= btrfs_scan_lblkid();
1469 /* iterate over the list of currently mountes filesystems */
1470 if ((f
= setmntent ("/proc/self/mounts", "r")) == NULL
)
1473 while ((mnt
= getmntent (f
)) != NULL
) {
1475 if(strcmp(mnt
->mnt_type
, "btrfs") != 0)
1478 ret
= blk_file_in_dev_list(fs_devices_mnt
, mnt
->mnt_fsname
);
1480 /* ignore entries in the mount table that are not
1481 associated with a file*/
1482 if((ret
= is_existing_blk_or_reg_file(mnt
->mnt_fsname
)) < 0)
1483 goto out_mntloop_err
;
1487 ret
= is_same_loop_file(file
, mnt
->mnt_fsname
);
1491 goto out_mntloop_err
;
1496 /* Did we find an entry in mnt table? */
1497 if (mnt
&& size
&& where
) {
1498 strncpy(where
, mnt
->mnt_dir
, size
);
1502 *fs_dev_ret
= fs_devices_mnt
;
1504 ret
= (mnt
!= NULL
);
1512 struct pending_dir
{
1513 struct list_head list
;
1514 char name
[PATH_MAX
];
1517 int btrfs_register_one_device(const char *fname
)
1519 struct btrfs_ioctl_vol_args args
;
1523 fd
= open("/dev/btrfs-control", O_RDWR
);
1525 fprintf(stderr
, "failed to open /dev/btrfs-control "
1526 "skipping device registration: %s\n",
1530 memset(&args
, 0, sizeof(args
));
1531 strncpy_null(args
.name
, fname
);
1532 ret
= ioctl(fd
, BTRFS_IOC_SCAN_DEV
, &args
);
1534 fprintf(stderr
, "ERROR: device scan failed '%s' - %s\n",
1535 fname
, strerror(errno
));
1543 * Register all devices in the fs_uuid list created in the user
1544 * space. Ensure btrfs_scan_lblkid() is called before this func.
1546 int btrfs_register_all_devices(void)
1549 struct btrfs_fs_devices
*fs_devices
;
1550 struct btrfs_device
*device
;
1551 struct list_head
*all_uuids
;
1553 all_uuids
= btrfs_scanned_uuids();
1555 list_for_each_entry(fs_devices
, all_uuids
, list
) {
1556 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
1557 if (*device
->name
) {
1558 err
= btrfs_register_one_device(device
->name
);
1569 int btrfs_device_already_in_root(struct btrfs_root
*root
, int fd
,
1572 struct btrfs_super_block
*disk_super
;
1576 buf
= malloc(BTRFS_SUPER_INFO_SIZE
);
1581 ret
= pread(fd
, buf
, BTRFS_SUPER_INFO_SIZE
, super_offset
);
1582 if (ret
!= BTRFS_SUPER_INFO_SIZE
)
1586 disk_super
= (struct btrfs_super_block
*)buf
;
1587 if (btrfs_super_magic(disk_super
) != BTRFS_MAGIC
)
1590 if (!memcmp(disk_super
->fsid
, root
->fs_info
->super_copy
->fsid
,
1600 * Note: this function uses a static per-thread buffer. Do not call this
1601 * function more than 10 times within one argument list!
1603 const char *pretty_size_mode(u64 size
, unsigned mode
)
1605 static __thread
int ps_index
= 0;
1606 static __thread
char ps_array
[10][32];
1609 ret
= ps_array
[ps_index
];
1612 (void)pretty_size_snprintf(size
, ret
, 32, mode
);
1617 static const char* unit_suffix_binary
[] =
1618 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1619 static const char* unit_suffix_decimal
[] =
1620 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1622 int pretty_size_snprintf(u64 size
, char *str
, size_t str_size
, unsigned unit_mode
)
1628 const char** suffix
= NULL
;
1634 if ((unit_mode
& ~UNITS_MODE_MASK
) == UNITS_RAW
) {
1635 snprintf(str
, str_size
, "%llu", size
);
1639 if ((unit_mode
& ~UNITS_MODE_MASK
) == UNITS_BINARY
) {
1642 suffix
= unit_suffix_binary
;
1643 } else if ((unit_mode
& ~UNITS_MODE_MASK
) == UNITS_DECIMAL
) {
1646 suffix
= unit_suffix_decimal
;
1651 fprintf(stderr
, "INTERNAL ERROR: unknown unit base, mode %d\n",
1659 switch (unit_mode
& UNITS_MODE_MASK
) {
1660 case UNITS_TBYTES
: base
*= mult
; num_divs
++;
1661 case UNITS_GBYTES
: base
*= mult
; num_divs
++;
1662 case UNITS_MBYTES
: base
*= mult
; num_divs
++;
1663 case UNITS_KBYTES
: num_divs
++;
1670 while (size
>= mult
) {
1677 if (num_divs
>= ARRAY_SIZE(unit_suffix_binary
)) {
1679 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1684 fraction
= (float)last_size
/ base
;
1686 return snprintf(str
, str_size
, "%.2f%s", fraction
, suffix
[num_divs
]);
1690 * __strncpy__null - strncpy with null termination
1691 * @dest: the target array
1692 * @src: the source string
1693 * @n: maximum bytes to copy (size of *dest)
1695 * Like strncpy, but ensures destination is null-terminated.
1697 * Copies the string pointed to by src, including the terminating null
1698 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1699 * of n bytes. Then ensure that dest is null-terminated.
1701 char *__strncpy__null(char *dest
, const char *src
, size_t n
)
1703 strncpy(dest
, src
, n
);
1710 * Checks to make sure that the label matches our requirements.
1712 0 if everything is safe and usable
1713 -1 if the label is too long
1715 static int check_label(const char *input
)
1717 int len
= strlen(input
);
1719 if (len
> BTRFS_LABEL_SIZE
- 1) {
1720 fprintf(stderr
, "ERROR: Label %s is too long (max %d)\n",
1721 input
, BTRFS_LABEL_SIZE
- 1);
1728 static int set_label_unmounted(const char *dev
, const char *label
)
1730 struct btrfs_trans_handle
*trans
;
1731 struct btrfs_root
*root
;
1734 ret
= check_mounted(dev
);
1736 fprintf(stderr
, "FATAL: error checking %s mount status\n", dev
);
1740 fprintf(stderr
, "ERROR: dev %s is mounted, use mount point\n",
1745 /* Open the super_block at the default location
1746 * and as read-write.
1748 root
= open_ctree(dev
, 0, OPEN_CTREE_WRITES
);
1749 if (!root
) /* errors are printed by open_ctree() */
1752 trans
= btrfs_start_transaction(root
, 1);
1753 snprintf(root
->fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
, "%s",
1755 btrfs_commit_transaction(trans
, root
);
1757 /* Now we close it since we are done. */
1762 static int set_label_mounted(const char *mount_path
, const char *label
)
1766 fd
= open(mount_path
, O_RDONLY
| O_NOATIME
);
1768 fprintf(stderr
, "ERROR: unable to access '%s'\n", mount_path
);
1772 if (ioctl(fd
, BTRFS_IOC_SET_FSLABEL
, label
) < 0) {
1773 fprintf(stderr
, "ERROR: unable to set label %s\n",
1783 int get_label_unmounted(const char *dev
, char *label
)
1785 struct btrfs_root
*root
;
1788 ret
= check_mounted(dev
);
1790 fprintf(stderr
, "FATAL: error checking %s mount status\n", dev
);
1794 /* Open the super_block at the default location
1797 root
= open_ctree(dev
, 0, 0);
1801 memcpy(label
, root
->fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
1803 /* Now we close it since we are done. */
1809 * If a partition is mounted, try to get the filesystem label via its
1810 * mounted path rather than device. Return the corresponding error
1811 * the user specified the device path.
1813 int get_label_mounted(const char *mount_path
, char *labelp
)
1815 char label
[BTRFS_LABEL_SIZE
];
1819 fd
= open(mount_path
, O_RDONLY
| O_NOATIME
);
1821 fprintf(stderr
, "ERROR: unable to access '%s'\n", mount_path
);
1825 memset(label
, '\0', sizeof(label
));
1826 ret
= ioctl(fd
, BTRFS_IOC_GET_FSLABEL
, label
);
1828 if (errno
!= ENOTTY
)
1829 fprintf(stderr
, "ERROR: unable to get label %s\n",
1836 strncpy(labelp
, label
, sizeof(label
));
1841 int get_label(const char *btrfs_dev
, char *label
)
1845 ret
= is_existing_blk_or_reg_file(btrfs_dev
);
1847 ret
= get_label_mounted(btrfs_dev
, label
);
1849 ret
= get_label_unmounted(btrfs_dev
, label
);
1854 int set_label(const char *btrfs_dev
, const char *label
)
1858 if (check_label(label
))
1861 ret
= is_existing_blk_or_reg_file(btrfs_dev
);
1863 ret
= set_label_mounted(btrfs_dev
, label
);
1865 ret
= set_label_unmounted(btrfs_dev
, label
);
1871 * Unsafe subvolume check.
1873 * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
1874 * btrfs mount point.
1875 * Must use together with other reliable method like btrfs ioctl.
1877 static int __is_subvol(const char *path
)
1882 ret
= lstat(path
, &st
);
1886 return st
.st_ino
== BTRFS_FIRST_FREE_OBJECTID
;
1890 * A not-so-good version fls64. No fascinating optimization since
1891 * no one except parse_size use it
1893 static int fls64(u64 x
)
1897 for (i
= 0; i
<64; i
++)
1898 if (x
<< i
& (1ULL << 63))
1903 u64
parse_size(char *s
)
1911 fprintf(stderr
, "ERROR: Size value is empty\n");
1916 "ERROR: Size value '%s' is less equal than 0\n", s
);
1919 ret
= strtoull(s
, &endptr
, 10);
1921 fprintf(stderr
, "ERROR: Size value '%s' is invalid\n", s
);
1924 if (endptr
[0] && endptr
[1]) {
1925 fprintf(stderr
, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1930 * strtoll returns LLONG_MAX when overflow, if this happens,
1931 * need to call strtoull to get the real size
1933 if (errno
== ERANGE
&& ret
== ULLONG_MAX
) {
1935 "ERROR: Size value '%s' is too large for u64\n", s
);
1939 c
= tolower(endptr
[0]);
1962 fprintf(stderr
, "ERROR: Unknown size descriptor '%c'\n",
1967 /* Check whether ret * mult overflow */
1968 if (fls64(ret
) + fls64(mult
) - 1 > 64) {
1970 "ERROR: Size value '%s' is too large for u64\n", s
);
1977 u64
parse_qgroupid(const char *p
)
1979 char *s
= strchr(p
, '/');
1980 const char *ptr_src_end
= p
+ strlen(p
);
1981 char *ptr_parse_end
= NULL
;
1990 /* Numeric format like '0/257' is the primary case */
1992 id
= strtoull(p
, &ptr_parse_end
, 10);
1993 if (ptr_parse_end
!= ptr_src_end
)
1997 level
= strtoull(p
, &ptr_parse_end
, 10);
1998 if (ptr_parse_end
!= s
)
2001 id
= strtoull(s
+ 1, &ptr_parse_end
, 10);
2002 if (ptr_parse_end
!= ptr_src_end
)
2005 return (level
<< BTRFS_QGROUP_LEVEL_SHIFT
) | id
;
2008 /* Path format like subv at 'my_subvol' is the fallback case */
2009 ret
= __is_subvol(p
);
2010 if (ret
< 0 || !ret
)
2012 fd
= open(p
, O_RDONLY
);
2015 ret
= lookup_ino_rootid(fd
, &id
);
2022 fprintf(stderr
, "ERROR: invalid qgroupid or subvolume path: %s\n", p
);
2026 int open_file_or_dir3(const char *fname
, DIR **dirstream
, int open_flags
)
2032 ret
= stat(fname
, &st
);
2036 if (S_ISDIR(st
.st_mode
)) {
2037 *dirstream
= opendir(fname
);
2040 fd
= dirfd(*dirstream
);
2041 } else if (S_ISREG(st
.st_mode
) || S_ISLNK(st
.st_mode
)) {
2042 fd
= open(fname
, open_flags
);
2045 * we set this on purpose, in case the caller output
2046 * strerror(errno) as success
2054 closedir(*dirstream
);
2061 int open_file_or_dir(const char *fname
, DIR **dirstream
)
2063 return open_file_or_dir3(fname
, dirstream
, O_RDWR
);
2066 void close_file_or_dir(int fd
, DIR *dirstream
)
2069 closedir(dirstream
);
2074 int get_device_info(int fd
, u64 devid
,
2075 struct btrfs_ioctl_dev_info_args
*di_args
)
2079 di_args
->devid
= devid
;
2080 memset(&di_args
->uuid
, '\0', sizeof(di_args
->uuid
));
2082 ret
= ioctl(fd
, BTRFS_IOC_DEV_INFO
, di_args
);
2083 return ret
< 0 ? -errno
: 0;
2086 static u64
find_max_device_id(struct btrfs_ioctl_search_args
*search_args
,
2089 struct btrfs_dev_item
*dev_item
;
2090 char *buf
= search_args
->buf
;
2092 buf
+= (nr_items
- 1) * (sizeof(struct btrfs_ioctl_search_header
)
2093 + sizeof(struct btrfs_dev_item
));
2094 buf
+= sizeof(struct btrfs_ioctl_search_header
);
2096 dev_item
= (struct btrfs_dev_item
*)buf
;
2098 return btrfs_stack_device_id(dev_item
);
2101 static int search_chunk_tree_for_fs_info(int fd
,
2102 struct btrfs_ioctl_fs_info_args
*fi_args
)
2106 u64 start_devid
= 1;
2107 struct btrfs_ioctl_search_args search_args
;
2108 struct btrfs_ioctl_search_key
*search_key
= &search_args
.key
;
2110 fi_args
->num_devices
= 0;
2112 max_items
= BTRFS_SEARCH_ARGS_BUFSIZE
2113 / (sizeof(struct btrfs_ioctl_search_header
)
2114 + sizeof(struct btrfs_dev_item
));
2116 search_key
->tree_id
= BTRFS_CHUNK_TREE_OBJECTID
;
2117 search_key
->min_objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
2118 search_key
->max_objectid
= BTRFS_DEV_ITEMS_OBJECTID
;
2119 search_key
->min_type
= BTRFS_DEV_ITEM_KEY
;
2120 search_key
->max_type
= BTRFS_DEV_ITEM_KEY
;
2121 search_key
->min_transid
= 0;
2122 search_key
->max_transid
= (u64
)-1;
2123 search_key
->nr_items
= max_items
;
2124 search_key
->max_offset
= (u64
)-1;
2127 search_key
->min_offset
= start_devid
;
2129 ret
= ioctl(fd
, BTRFS_IOC_TREE_SEARCH
, &search_args
);
2133 fi_args
->num_devices
+= (u64
)search_key
->nr_items
;
2135 if (search_key
->nr_items
== max_items
) {
2136 start_devid
= find_max_device_id(&search_args
,
2137 search_key
->nr_items
) + 1;
2141 /* get the lastest max_id to stay consistent with the num_devices */
2142 if (search_key
->nr_items
== 0)
2144 * last tree_search returns an empty buf, use the devid of
2145 * the last dev_item of the previous tree_search
2147 fi_args
->max_id
= start_devid
- 1;
2149 fi_args
->max_id
= find_max_device_id(&search_args
,
2150 search_key
->nr_items
);
2156 * For a given path, fill in the ioctl fs_ and info_ args.
2157 * If the path is a btrfs mountpoint, fill info for all devices.
2158 * If the path is a btrfs device, fill in only that device.
2160 * The path provided must be either on a mounted btrfs fs,
2161 * or be a mounted btrfs device.
2163 * Returns 0 on success, or a negative errno.
2165 int get_fs_info(char *path
, struct btrfs_ioctl_fs_info_args
*fi_args
,
2166 struct btrfs_ioctl_dev_info_args
**di_ret
)
2173 struct btrfs_fs_devices
*fs_devices_mnt
= NULL
;
2174 struct btrfs_ioctl_dev_info_args
*di_args
;
2175 struct btrfs_ioctl_dev_info_args tmp
;
2177 DIR *dirstream
= NULL
;
2179 memset(fi_args
, 0, sizeof(*fi_args
));
2181 if (is_block_device(path
) == 1) {
2182 struct btrfs_super_block
*disk_super
;
2183 char buf
[BTRFS_SUPER_INFO_SIZE
];
2186 /* Ensure it's mounted, then set path to the mountpoint */
2187 fd
= open(path
, O_RDONLY
);
2190 fprintf(stderr
, "Couldn't open %s: %s\n",
2191 path
, strerror(errno
));
2194 ret
= check_mounted_where(fd
, path
, mp
, sizeof(mp
),
2203 /* Only fill in this one device */
2204 fi_args
->num_devices
= 1;
2206 disk_super
= (struct btrfs_super_block
*)buf
;
2207 ret
= btrfs_read_dev_super(fd
, disk_super
,
2208 BTRFS_SUPER_INFO_OFFSET
, 0);
2213 devid
= btrfs_stack_device_id(&disk_super
->dev_item
);
2215 fi_args
->max_id
= devid
;
2218 memcpy(fi_args
->fsid
, fs_devices_mnt
->fsid
, BTRFS_FSID_SIZE
);
2222 /* at this point path must not be for a block device */
2223 fd
= open_file_or_dir(path
, &dirstream
);
2229 /* fill in fi_args if not just a single device */
2230 if (fi_args
->num_devices
!= 1) {
2231 ret
= ioctl(fd
, BTRFS_IOC_FS_INFO
, fi_args
);
2238 * The fs_args->num_devices does not include seed devices
2240 ret
= search_chunk_tree_for_fs_info(fd
, fi_args
);
2245 * search_chunk_tree_for_fs_info() will lacks the devid 0
2246 * so manual probe for it here.
2248 ret
= get_device_info(fd
, 0, &tmp
);
2250 fi_args
->num_devices
++;
2258 if (!fi_args
->num_devices
)
2261 di_args
= *di_ret
= malloc((fi_args
->num_devices
) * sizeof(*di_args
));
2268 memcpy(di_args
, &tmp
, sizeof(tmp
));
2269 for (; i
<= fi_args
->max_id
; ++i
) {
2270 ret
= get_device_info(fd
, i
, &di_args
[ndevs
]);
2279 * only when the only dev we wanted to find is not there then
2280 * let any error be returned
2282 if (fi_args
->num_devices
!= 1) {
2288 close_file_or_dir(fd
, dirstream
);
2292 #define isoctal(c) (((c) & ~7) == '0')
2294 static inline void translate(char *f
, char *t
)
2296 while (*f
!= '\0') {
2298 isoctal(f
[1]) && isoctal(f
[2]) && isoctal(f
[3])) {
2299 *t
++ = 64*(f
[1] & 7) + 8*(f
[2] & 7) + (f
[3] & 7);
2309 * Checks if the swap device.
2310 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2312 static int is_swap_device(const char *file
)
2323 if (stat(file
, &st_buf
) < 0)
2325 if (S_ISBLK(st_buf
.st_mode
))
2326 dev
= st_buf
.st_rdev
;
2327 else if (S_ISREG(st_buf
.st_mode
)) {
2328 dev
= st_buf
.st_dev
;
2329 ino
= st_buf
.st_ino
;
2333 if ((f
= fopen("/proc/swaps", "r")) == NULL
)
2336 /* skip the first line */
2337 if (fgets(tmp
, sizeof(tmp
), f
) == NULL
)
2340 while (fgets(tmp
, sizeof(tmp
), f
) != NULL
) {
2341 if ((cp
= strchr(tmp
, ' ')) != NULL
)
2343 if ((cp
= strchr(tmp
, '\t')) != NULL
)
2345 translate(tmp
, buf
);
2346 if (stat(buf
, &st_buf
) != 0)
2348 if (S_ISBLK(st_buf
.st_mode
)) {
2349 if (dev
== st_buf
.st_rdev
) {
2353 } else if (S_ISREG(st_buf
.st_mode
)) {
2354 if (dev
== st_buf
.st_dev
&& ino
== st_buf
.st_ino
) {
2368 * Check for existing filesystem or partition table on device.
2370 * 1 for existing fs or partition
2371 * 0 for nothing found
2372 * -1 for internal error
2379 blkid_probe pr
= NULL
;
2383 if (!device
|| !*device
)
2386 ret
= -1; /* will reset on success of all setup calls */
2388 pr
= blkid_new_probe_from_filename(device
);
2392 size
= blkid_probe_get_size(pr
);
2396 /* nothing to overwrite on a 0-length device */
2402 ret
= blkid_probe_enable_partitions(pr
, 1);
2406 ret
= blkid_do_fullprobe(pr
);
2411 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2412 * but we want the exact opposite, so reverse the return value here.
2414 * In addition print some useful diagnostics about what actually is
2422 if (!blkid_probe_lookup_value(pr
, "TYPE", &type
, NULL
)) {
2424 "%s appears to contain an existing "
2425 "filesystem (%s).\n", device
, type
);
2426 } else if (!blkid_probe_lookup_value(pr
, "PTTYPE", &type
, NULL
)) {
2428 "%s appears to contain a partition "
2429 "table (%s).\n", device
, type
);
2432 "%s appears to contain something weird "
2433 "according to blkid\n", device
);
2439 blkid_free_probe(pr
);
2442 "probe of %s failed, cannot detect "
2443 "existing filesystem.\n", device
);
2447 static int group_profile_devs_min(u64 flag
)
2449 switch (flag
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) {
2450 case 0: /* single */
2451 case BTRFS_BLOCK_GROUP_DUP
:
2453 case BTRFS_BLOCK_GROUP_RAID0
:
2454 case BTRFS_BLOCK_GROUP_RAID1
:
2455 case BTRFS_BLOCK_GROUP_RAID5
:
2457 case BTRFS_BLOCK_GROUP_RAID6
:
2459 case BTRFS_BLOCK_GROUP_RAID10
:
2466 int test_num_disk_vs_raid(u64 metadata_profile
, u64 data_profile
,
2467 u64 dev_cnt
, int mixed
, int ssd
)
2474 allowed
|= BTRFS_BLOCK_GROUP_RAID10
;
2476 allowed
|= BTRFS_BLOCK_GROUP_RAID6
;
2478 allowed
|= BTRFS_BLOCK_GROUP_RAID0
| BTRFS_BLOCK_GROUP_RAID1
|
2479 BTRFS_BLOCK_GROUP_RAID5
;
2482 allowed
|= BTRFS_BLOCK_GROUP_DUP
;
2486 ((metadata_profile
| data_profile
) & BTRFS_BLOCK_GROUP_DUP
)) {
2488 "ERROR: DUP is not allowed when FS has multiple devices\n");
2491 if (metadata_profile
& ~allowed
) {
2493 "ERROR: unable to create FS with metadata profile %s "
2494 "(have %llu devices but %d devices are required)\n",
2495 btrfs_group_profile_str(metadata_profile
), dev_cnt
,
2496 group_profile_devs_min(metadata_profile
));
2499 if (data_profile
& ~allowed
) {
2501 "ERROR: unable to create FS with data profile %s "
2502 "(have %llu devices but %d devices are required)\n",
2503 btrfs_group_profile_str(data_profile
), dev_cnt
,
2504 group_profile_devs_min(data_profile
));
2508 warning_on(!mixed
&& (data_profile
& BTRFS_BLOCK_GROUP_DUP
) && ssd
,
2509 "DUP may not actually lead to 2 copies on the device, see manual page");
2514 int group_profile_max_safe_loss(u64 flags
)
2516 switch (flags
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) {
2517 case 0: /* single */
2518 case BTRFS_BLOCK_GROUP_DUP
:
2519 case BTRFS_BLOCK_GROUP_RAID0
:
2521 case BTRFS_BLOCK_GROUP_RAID1
:
2522 case BTRFS_BLOCK_GROUP_RAID5
:
2523 case BTRFS_BLOCK_GROUP_RAID10
:
2525 case BTRFS_BLOCK_GROUP_RAID6
:
2533 * Check if a device is suitable for btrfs
2535 * 1: something is wrong, an error is printed
2538 int test_dev_for_mkfs(char *file
, int force_overwrite
)
2543 ret
= is_swap_device(file
);
2545 fprintf(stderr
, "ERROR: checking status of %s: %s\n", file
,
2550 fprintf(stderr
, "ERROR: %s is a swap device\n", file
);
2553 if (!force_overwrite
) {
2554 if (check_overwrite(file
)) {
2555 fprintf(stderr
, "Use the -f option to force overwrite.\n");
2559 ret
= check_mounted(file
);
2561 fprintf(stderr
, "ERROR: checking mount status of %s: %s\n",
2562 file
, strerror(-ret
));
2566 fprintf(stderr
, "ERROR: %s is mounted\n", file
);
2569 /* check if the device is busy */
2570 fd
= open(file
, O_RDWR
|O_EXCL
);
2572 fprintf(stderr
, "ERROR: unable to open %s: %s\n", file
,
2576 if (fstat(fd
, &st
)) {
2577 fprintf(stderr
, "ERROR: unable to stat %s: %s\n", file
,
2582 if (!S_ISBLK(st
.st_mode
)) {
2583 fprintf(stderr
, "ERROR: %s is not a block device\n", file
);
2591 int btrfs_scan_lblkid(void)
2596 struct btrfs_fs_devices
*tmp_devices
;
2597 blkid_dev_iterate iter
= NULL
;
2598 blkid_dev dev
= NULL
;
2599 blkid_cache cache
= NULL
;
2600 char path
[PATH_MAX
];
2602 if (btrfs_scan_done
)
2605 if (blkid_get_cache(&cache
, NULL
) < 0) {
2606 printf("ERROR: lblkid cache get failed\n");
2609 blkid_probe_all(cache
);
2610 iter
= blkid_dev_iterate_begin(cache
);
2611 blkid_dev_set_search(iter
, "TYPE", "btrfs");
2612 while (blkid_dev_next(iter
, &dev
) == 0) {
2613 dev
= blkid_verify(cache
, dev
);
2616 /* if we are here its definitely a btrfs disk*/
2617 strncpy_null(path
, blkid_dev_devname(dev
));
2619 fd
= open(path
, O_RDONLY
);
2621 printf("ERROR: could not open %s\n", path
);
2624 ret
= btrfs_scan_one_device(fd
, path
, &tmp_devices
,
2625 &num_devices
, BTRFS_SUPER_INFO_OFFSET
, 0);
2627 printf("ERROR: could not scan %s\n", path
);
2634 blkid_dev_iterate_end(iter
);
2635 blkid_put_cache(cache
);
2637 btrfs_scan_done
= 1;
2642 int is_vol_small(char *file
)
2649 fd
= open(file
, O_RDONLY
);
2652 if (fstat(fd
, &st
) < 0) {
2657 size
= btrfs_device_size(fd
, &st
);
2662 if (size
< BTRFS_MKFS_SMALL_VOLUME_SIZE
) {
2672 * This reads a line from the stdin and only returns non-zero if the
2673 * first whitespace delimited token is a case insensitive match with yes
2676 int ask_user(char *question
)
2678 char buf
[30] = {0,};
2679 char *saveptr
= NULL
;
2682 printf("%s [y/N]: ", question
);
2684 return fgets(buf
, sizeof(buf
) - 1, stdin
) &&
2685 (answer
= strtok_r(buf
, " \t\n\r", &saveptr
)) &&
2686 (!strcasecmp(answer
, "yes") || !strcasecmp(answer
, "y"));
2691 * - file or directory return the containing tree root id
2692 * - subvolume return its own tree id
2693 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2694 * undefined and function returns -1
2696 int lookup_ino_rootid(int fd
, u64
*rootid
)
2698 struct btrfs_ioctl_ino_lookup_args args
;
2701 memset(&args
, 0, sizeof(args
));
2703 args
.objectid
= BTRFS_FIRST_FREE_OBJECTID
;
2705 ret
= ioctl(fd
, BTRFS_IOC_INO_LOOKUP
, &args
);
2707 fprintf(stderr
, "ERROR: Failed to lookup root id - %s\n",
2712 *rootid
= args
.treeid
;
2718 * return 0 if a btrfs mount point is found
2719 * return 1 if a mount point is found but not btrfs
2720 * return <0 if something goes wrong
2722 int find_mount_root(const char *path
, char **mount_root
)
2730 int longest_matchlen
= 0;
2731 char *longest_match
= NULL
;
2733 fd
= open(path
, O_RDONLY
| O_NOATIME
);
2738 mnttab
= setmntent("/proc/self/mounts", "r");
2742 while ((ent
= getmntent(mnttab
))) {
2743 len
= strlen(ent
->mnt_dir
);
2744 if (strncmp(ent
->mnt_dir
, path
, len
) == 0) {
2745 /* match found and use the latest match */
2746 if (longest_matchlen
<= len
) {
2747 free(longest_match
);
2748 longest_matchlen
= len
;
2749 longest_match
= strdup(ent
->mnt_dir
);
2750 not_btrfs
= strcmp(ent
->mnt_type
, "btrfs");
2759 free(longest_match
);
2764 *mount_root
= realpath(longest_match
, NULL
);
2768 free(longest_match
);
2772 int test_minimum_size(const char *file
, u32 nodesize
)
2775 struct stat statbuf
;
2777 fd
= open(file
, O_RDONLY
);
2780 if (stat(file
, &statbuf
) < 0) {
2784 if (btrfs_device_size(fd
, &statbuf
) < btrfs_min_dev_size(nodesize
)) {
2793 * test if name is a correct subvolume name
2794 * this function return
2795 * 0-> name is not a correct subvolume name
2796 * 1-> name is a correct subvolume name
2798 int test_issubvolname(const char *name
)
2800 return name
[0] != '\0' && !strchr(name
, '/') &&
2801 strcmp(name
, ".") && strcmp(name
, "..");
2805 * Test if path is a directory
2807 * 0 - path exists but it is not a directory
2808 * 1 - path exists and it is a directory
2811 int test_isdir(const char *path
)
2816 ret
= stat(path
, &st
);
2820 return !!S_ISDIR(st
.st_mode
);
2823 void units_set_mode(unsigned *units
, unsigned mode
)
2825 unsigned base
= *units
& UNITS_MODE_MASK
;
2827 *units
= base
| mode
;
2830 void units_set_base(unsigned *units
, unsigned base
)
2832 unsigned mode
= *units
& ~UNITS_MODE_MASK
;
2834 *units
= base
| mode
;
2837 int find_next_key(struct btrfs_path
*path
, struct btrfs_key
*key
)
2841 for (level
= 0; level
< BTRFS_MAX_LEVEL
; level
++) {
2842 if (!path
->nodes
[level
])
2844 if (path
->slots
[level
] + 1 >=
2845 btrfs_header_nritems(path
->nodes
[level
]))
2848 btrfs_item_key_to_cpu(path
->nodes
[level
], key
,
2849 path
->slots
[level
] + 1);
2851 btrfs_node_key_to_cpu(path
->nodes
[level
], key
,
2852 path
->slots
[level
] + 1);
2858 char* btrfs_group_type_str(u64 flag
)
2860 u64 mask
= BTRFS_BLOCK_GROUP_TYPE_MASK
|
2861 BTRFS_SPACE_INFO_GLOBAL_RSV
;
2863 switch (flag
& mask
) {
2864 case BTRFS_BLOCK_GROUP_DATA
:
2866 case BTRFS_BLOCK_GROUP_SYSTEM
:
2868 case BTRFS_BLOCK_GROUP_METADATA
:
2870 case BTRFS_BLOCK_GROUP_DATA
|BTRFS_BLOCK_GROUP_METADATA
:
2871 return "Data+Metadata";
2872 case BTRFS_SPACE_INFO_GLOBAL_RSV
:
2873 return "GlobalReserve";
2879 char* btrfs_group_profile_str(u64 flag
)
2881 switch (flag
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) {
2884 case BTRFS_BLOCK_GROUP_RAID0
:
2886 case BTRFS_BLOCK_GROUP_RAID1
:
2888 case BTRFS_BLOCK_GROUP_RAID5
:
2890 case BTRFS_BLOCK_GROUP_RAID6
:
2892 case BTRFS_BLOCK_GROUP_DUP
:
2894 case BTRFS_BLOCK_GROUP_RAID10
:
2901 u64
disk_size(char *path
)
2905 if (statfs(path
, &sfs
) < 0)
2908 return sfs
.f_bsize
* sfs
.f_blocks
;
2911 u64
get_partition_size(char *dev
)
2914 int fd
= open(dev
, O_RDONLY
);
2918 if (ioctl(fd
, BLKGETSIZE64
, &result
) < 0) {
2927 int btrfs_tree_search2_ioctl_supported(int fd
)
2929 struct btrfs_ioctl_search_args_v2
*args2
;
2930 struct btrfs_ioctl_search_key
*sk
;
2931 int args2_size
= 1024;
2932 char args2_buf
[args2_size
];
2934 static int v2_supported
= -1;
2936 if (v2_supported
!= -1)
2937 return v2_supported
;
2939 args2
= (struct btrfs_ioctl_search_args_v2
*)args2_buf
;
2943 * Search for the extent tree item in the root tree.
2945 sk
->tree_id
= BTRFS_ROOT_TREE_OBJECTID
;
2946 sk
->min_objectid
= BTRFS_EXTENT_TREE_OBJECTID
;
2947 sk
->max_objectid
= BTRFS_EXTENT_TREE_OBJECTID
;
2948 sk
->min_type
= BTRFS_ROOT_ITEM_KEY
;
2949 sk
->max_type
= BTRFS_ROOT_ITEM_KEY
;
2951 sk
->max_offset
= (u64
)-1;
2952 sk
->min_transid
= 0;
2953 sk
->max_transid
= (u64
)-1;
2955 args2
->buf_size
= args2_size
- sizeof(struct btrfs_ioctl_search_args_v2
);
2956 ret
= ioctl(fd
, BTRFS_IOC_TREE_SEARCH_V2
, args2
);
2957 if (ret
== -EOPNOTSUPP
)
2964 return v2_supported
;
2967 int btrfs_check_nodesize(u32 nodesize
, u32 sectorsize
, u64 features
)
2969 if (nodesize
< sectorsize
) {
2971 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2972 nodesize
, sectorsize
);
2974 } else if (nodesize
> BTRFS_MAX_METADATA_BLOCKSIZE
) {
2976 "ERROR: Illegal nodesize %u (larger than %u)\n",
2977 nodesize
, BTRFS_MAX_METADATA_BLOCKSIZE
);
2979 } else if (nodesize
& (sectorsize
- 1)) {
2981 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2982 nodesize
, sectorsize
);
2984 } else if (features
& BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS
&&
2985 nodesize
!= sectorsize
) {
2987 "ERROR: Illegal nodesize %u (not equal to %u for mixed block group)\n",
2988 nodesize
, sectorsize
);
2995 * Copy a path argument from SRC to DEST and check the SRC length if it's at
2996 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
2998 * The destination buffer is zero terminated.
2999 * Return < 0 for error, 0 otherwise.
3001 int arg_copy_path(char *dest
, const char *src
, int destlen
)
3003 size_t len
= strlen(src
);
3005 if (len
>= PATH_MAX
|| len
>= destlen
)
3006 return -ENAMETOOLONG
;
3008 __strncpy__null(dest
, src
, destlen
);
3013 unsigned int get_unit_mode_from_arg(int *argc
, char *argv
[], int df_mode
)
3015 unsigned int unit_mode
= UNITS_DEFAULT
;
3019 for (arg_i
= 0; arg_i
< *argc
; arg_i
++) {
3020 if (!strcmp(argv
[arg_i
], "--raw")) {
3021 unit_mode
= UNITS_RAW
;
3025 if (!strcmp(argv
[arg_i
], "--human-readable")) {
3026 unit_mode
= UNITS_HUMAN_BINARY
;
3031 if (!strcmp(argv
[arg_i
], "--iec")) {
3032 units_set_mode(&unit_mode
, UNITS_BINARY
);
3036 if (!strcmp(argv
[arg_i
], "--si")) {
3037 units_set_mode(&unit_mode
, UNITS_DECIMAL
);
3042 if (!strcmp(argv
[arg_i
], "--kbytes")) {
3043 units_set_base(&unit_mode
, UNITS_KBYTES
);
3047 if (!strcmp(argv
[arg_i
], "--mbytes")) {
3048 units_set_base(&unit_mode
, UNITS_MBYTES
);
3052 if (!strcmp(argv
[arg_i
], "--gbytes")) {
3053 units_set_base(&unit_mode
, UNITS_GBYTES
);
3057 if (!strcmp(argv
[arg_i
], "--tbytes")) {
3058 units_set_base(&unit_mode
, UNITS_TBYTES
);
3066 if (!strcmp(argv
[arg_i
], "-b")) {
3067 unit_mode
= UNITS_RAW
;
3071 if (!strcmp(argv
[arg_i
], "-h")) {
3072 unit_mode
= UNITS_HUMAN_BINARY
;
3076 if (!strcmp(argv
[arg_i
], "-H")) {
3077 unit_mode
= UNITS_HUMAN_DECIMAL
;
3081 if (!strcmp(argv
[arg_i
], "-k")) {
3082 units_set_base(&unit_mode
, UNITS_KBYTES
);
3086 if (!strcmp(argv
[arg_i
], "-m")) {
3087 units_set_base(&unit_mode
, UNITS_MBYTES
);
3091 if (!strcmp(argv
[arg_i
], "-g")) {
3092 units_set_base(&unit_mode
, UNITS_GBYTES
);
3096 if (!strcmp(argv
[arg_i
], "-t")) {
3097 units_set_base(&unit_mode
, UNITS_TBYTES
);
3103 for (arg_i
= 0, arg_end
= 0; arg_i
< *argc
; arg_i
++) {
3106 argv
[arg_end
] = argv
[arg_i
];
3115 int string_is_numerical(const char *str
)
3117 if (!(*str
>= '0' && *str
<= '9'))
3119 while (*str
>= '0' && *str
<= '9')
3127 * Preprocess @argv with getopt_long to reorder options and consume the "--"
3129 * Unknown short and long options are reported, optionally the @usage is printed
3132 void clean_args_no_options(int argc
, char *argv
[], const char * const *usagestr
)
3134 static const struct option long_options
[] = {
3139 int c
= getopt_long(argc
, argv
, "", long_options
, NULL
);