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83d290c5 | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
d4a704af MB |
2 | /* |
3 | * From linux/include/uapi/linux/btrfs_tree.h | |
d4a704af MB |
4 | */ |
5 | ||
6 | #ifndef __BTRFS_BTRFS_TREE_H__ | |
7 | #define __BTRFS_BTRFS_TREE_H__ | |
8 | ||
9 | #include <common.h> | |
10 | ||
11 | #define BTRFS_VOL_NAME_MAX 255 | |
12 | #define BTRFS_NAME_MAX 255 | |
13 | #define BTRFS_LABEL_SIZE 256 | |
14 | #define BTRFS_FSID_SIZE 16 | |
15 | #define BTRFS_UUID_SIZE 16 | |
16 | ||
17 | /* | |
18 | * This header contains the structure definitions and constants used | |
19 | * by file system objects that can be retrieved using | |
20 | * the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that | |
21 | * is needed to describe a leaf node's key or item contents. | |
22 | */ | |
23 | ||
24 | /* holds pointers to all of the tree roots */ | |
25 | #define BTRFS_ROOT_TREE_OBJECTID 1ULL | |
26 | ||
27 | /* stores information about which extents are in use, and reference counts */ | |
28 | #define BTRFS_EXTENT_TREE_OBJECTID 2ULL | |
29 | ||
30 | /* | |
31 | * chunk tree stores translations from logical -> physical block numbering | |
32 | * the super block points to the chunk tree | |
33 | */ | |
34 | #define BTRFS_CHUNK_TREE_OBJECTID 3ULL | |
35 | ||
36 | /* | |
37 | * stores information about which areas of a given device are in use. | |
38 | * one per device. The tree of tree roots points to the device tree | |
39 | */ | |
40 | #define BTRFS_DEV_TREE_OBJECTID 4ULL | |
41 | ||
42 | /* one per subvolume, storing files and directories */ | |
43 | #define BTRFS_FS_TREE_OBJECTID 5ULL | |
44 | ||
45 | /* directory objectid inside the root tree */ | |
46 | #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL | |
47 | ||
48 | /* holds checksums of all the data extents */ | |
49 | #define BTRFS_CSUM_TREE_OBJECTID 7ULL | |
50 | ||
51 | /* holds quota configuration and tracking */ | |
52 | #define BTRFS_QUOTA_TREE_OBJECTID 8ULL | |
53 | ||
54 | /* for storing items that use the BTRFS_UUID_KEY* types */ | |
55 | #define BTRFS_UUID_TREE_OBJECTID 9ULL | |
56 | ||
57 | /* tracks free space in block groups. */ | |
58 | #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL | |
59 | ||
60 | /* device stats in the device tree */ | |
61 | #define BTRFS_DEV_STATS_OBJECTID 0ULL | |
62 | ||
63 | /* for storing balance parameters in the root tree */ | |
64 | #define BTRFS_BALANCE_OBJECTID -4ULL | |
65 | ||
66 | /* orhpan objectid for tracking unlinked/truncated files */ | |
67 | #define BTRFS_ORPHAN_OBJECTID -5ULL | |
68 | ||
69 | /* does write ahead logging to speed up fsyncs */ | |
70 | #define BTRFS_TREE_LOG_OBJECTID -6ULL | |
71 | #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL | |
72 | ||
73 | /* for space balancing */ | |
74 | #define BTRFS_TREE_RELOC_OBJECTID -8ULL | |
75 | #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL | |
76 | ||
77 | /* | |
78 | * extent checksums all have this objectid | |
79 | * this allows them to share the logging tree | |
80 | * for fsyncs | |
81 | */ | |
82 | #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL | |
83 | ||
84 | /* For storing free space cache */ | |
85 | #define BTRFS_FREE_SPACE_OBJECTID -11ULL | |
86 | ||
87 | /* | |
88 | * The inode number assigned to the special inode for storing | |
89 | * free ino cache | |
90 | */ | |
91 | #define BTRFS_FREE_INO_OBJECTID -12ULL | |
92 | ||
93 | /* dummy objectid represents multiple objectids */ | |
94 | #define BTRFS_MULTIPLE_OBJECTIDS -255ULL | |
95 | ||
96 | /* | |
97 | * All files have objectids in this range. | |
98 | */ | |
99 | #define BTRFS_FIRST_FREE_OBJECTID 256ULL | |
100 | #define BTRFS_LAST_FREE_OBJECTID -256ULL | |
101 | #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL | |
102 | ||
103 | ||
104 | /* | |
105 | * the device items go into the chunk tree. The key is in the form | |
106 | * [ 1 BTRFS_DEV_ITEM_KEY device_id ] | |
107 | */ | |
108 | #define BTRFS_DEV_ITEMS_OBJECTID 1ULL | |
109 | ||
110 | #define BTRFS_BTREE_INODE_OBJECTID 1 | |
111 | ||
112 | #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2 | |
113 | ||
114 | #define BTRFS_DEV_REPLACE_DEVID 0ULL | |
115 | ||
116 | /* | |
117 | * inode items have the data typically returned from stat and store other | |
118 | * info about object characteristics. There is one for every file and dir in | |
119 | * the FS | |
120 | */ | |
121 | #define BTRFS_INODE_ITEM_KEY 1 | |
122 | #define BTRFS_INODE_REF_KEY 12 | |
123 | #define BTRFS_INODE_EXTREF_KEY 13 | |
124 | #define BTRFS_XATTR_ITEM_KEY 24 | |
125 | #define BTRFS_ORPHAN_ITEM_KEY 48 | |
126 | /* reserve 2-15 close to the inode for later flexibility */ | |
127 | ||
128 | /* | |
129 | * dir items are the name -> inode pointers in a directory. There is one | |
130 | * for every name in a directory. | |
131 | */ | |
132 | #define BTRFS_DIR_LOG_ITEM_KEY 60 | |
133 | #define BTRFS_DIR_LOG_INDEX_KEY 72 | |
134 | #define BTRFS_DIR_ITEM_KEY 84 | |
135 | #define BTRFS_DIR_INDEX_KEY 96 | |
136 | /* | |
137 | * extent data is for file data | |
138 | */ | |
139 | #define BTRFS_EXTENT_DATA_KEY 108 | |
140 | ||
141 | /* | |
142 | * extent csums are stored in a separate tree and hold csums for | |
143 | * an entire extent on disk. | |
144 | */ | |
145 | #define BTRFS_EXTENT_CSUM_KEY 128 | |
146 | ||
147 | /* | |
148 | * root items point to tree roots. They are typically in the root | |
149 | * tree used by the super block to find all the other trees | |
150 | */ | |
151 | #define BTRFS_ROOT_ITEM_KEY 132 | |
152 | ||
153 | /* | |
154 | * root backrefs tie subvols and snapshots to the directory entries that | |
155 | * reference them | |
156 | */ | |
157 | #define BTRFS_ROOT_BACKREF_KEY 144 | |
158 | ||
159 | /* | |
160 | * root refs make a fast index for listing all of the snapshots and | |
161 | * subvolumes referenced by a given root. They point directly to the | |
162 | * directory item in the root that references the subvol | |
163 | */ | |
164 | #define BTRFS_ROOT_REF_KEY 156 | |
165 | ||
166 | /* | |
167 | * extent items are in the extent map tree. These record which blocks | |
168 | * are used, and how many references there are to each block | |
169 | */ | |
170 | #define BTRFS_EXTENT_ITEM_KEY 168 | |
171 | ||
172 | /* | |
173 | * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know | |
174 | * the length, so we save the level in key->offset instead of the length. | |
175 | */ | |
176 | #define BTRFS_METADATA_ITEM_KEY 169 | |
177 | ||
178 | #define BTRFS_TREE_BLOCK_REF_KEY 176 | |
179 | ||
180 | #define BTRFS_EXTENT_DATA_REF_KEY 178 | |
181 | ||
182 | #define BTRFS_EXTENT_REF_V0_KEY 180 | |
183 | ||
184 | #define BTRFS_SHARED_BLOCK_REF_KEY 182 | |
185 | ||
186 | #define BTRFS_SHARED_DATA_REF_KEY 184 | |
187 | ||
188 | /* | |
189 | * block groups give us hints into the extent allocation trees. Which | |
190 | * blocks are free etc etc | |
191 | */ | |
192 | #define BTRFS_BLOCK_GROUP_ITEM_KEY 192 | |
193 | ||
194 | /* | |
195 | * Every block group is represented in the free space tree by a free space info | |
196 | * item, which stores some accounting information. It is keyed on | |
197 | * (block_group_start, FREE_SPACE_INFO, block_group_length). | |
198 | */ | |
199 | #define BTRFS_FREE_SPACE_INFO_KEY 198 | |
200 | ||
201 | /* | |
202 | * A free space extent tracks an extent of space that is free in a block group. | |
203 | * It is keyed on (start, FREE_SPACE_EXTENT, length). | |
204 | */ | |
205 | #define BTRFS_FREE_SPACE_EXTENT_KEY 199 | |
206 | ||
207 | /* | |
208 | * When a block group becomes very fragmented, we convert it to use bitmaps | |
209 | * instead of extents. A free space bitmap is keyed on | |
210 | * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with | |
211 | * (length / sectorsize) bits. | |
212 | */ | |
213 | #define BTRFS_FREE_SPACE_BITMAP_KEY 200 | |
214 | ||
215 | #define BTRFS_DEV_EXTENT_KEY 204 | |
216 | #define BTRFS_DEV_ITEM_KEY 216 | |
217 | #define BTRFS_CHUNK_ITEM_KEY 228 | |
218 | ||
219 | /* | |
220 | * Records the overall state of the qgroups. | |
221 | * There's only one instance of this key present, | |
222 | * (0, BTRFS_QGROUP_STATUS_KEY, 0) | |
223 | */ | |
224 | #define BTRFS_QGROUP_STATUS_KEY 240 | |
225 | /* | |
226 | * Records the currently used space of the qgroup. | |
227 | * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid). | |
228 | */ | |
229 | #define BTRFS_QGROUP_INFO_KEY 242 | |
230 | /* | |
231 | * Contains the user configured limits for the qgroup. | |
232 | * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid). | |
233 | */ | |
234 | #define BTRFS_QGROUP_LIMIT_KEY 244 | |
235 | /* | |
236 | * Records the child-parent relationship of qgroups. For | |
237 | * each relation, 2 keys are present: | |
238 | * (childid, BTRFS_QGROUP_RELATION_KEY, parentid) | |
239 | * (parentid, BTRFS_QGROUP_RELATION_KEY, childid) | |
240 | */ | |
241 | #define BTRFS_QGROUP_RELATION_KEY 246 | |
242 | ||
243 | /* | |
244 | * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY. | |
245 | */ | |
246 | #define BTRFS_BALANCE_ITEM_KEY 248 | |
247 | ||
248 | /* | |
249 | * The key type for tree items that are stored persistently, but do not need to | |
250 | * exist for extended period of time. The items can exist in any tree. | |
251 | * | |
252 | * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data] | |
253 | * | |
254 | * Existing items: | |
255 | * | |
256 | * - balance status item | |
257 | * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0) | |
258 | */ | |
259 | #define BTRFS_TEMPORARY_ITEM_KEY 248 | |
260 | ||
261 | /* | |
262 | * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY | |
263 | */ | |
264 | #define BTRFS_DEV_STATS_KEY 249 | |
265 | ||
266 | /* | |
267 | * The key type for tree items that are stored persistently and usually exist | |
268 | * for a long period, eg. filesystem lifetime. The item kinds can be status | |
269 | * information, stats or preference values. The item can exist in any tree. | |
270 | * | |
271 | * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data] | |
272 | * | |
273 | * Existing items: | |
274 | * | |
275 | * - device statistics, store IO stats in the device tree, one key for all | |
276 | * stats | |
277 | * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0) | |
278 | */ | |
279 | #define BTRFS_PERSISTENT_ITEM_KEY 249 | |
280 | ||
281 | /* | |
282 | * Persistantly stores the device replace state in the device tree. | |
283 | * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0). | |
284 | */ | |
285 | #define BTRFS_DEV_REPLACE_KEY 250 | |
286 | ||
287 | /* | |
288 | * Stores items that allow to quickly map UUIDs to something else. | |
289 | * These items are part of the filesystem UUID tree. | |
290 | * The key is built like this: | |
291 | * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits). | |
292 | */ | |
293 | #if BTRFS_UUID_SIZE != 16 | |
294 | #error "UUID items require BTRFS_UUID_SIZE == 16!" | |
295 | #endif | |
296 | #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */ | |
297 | #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to | |
298 | * received subvols */ | |
299 | ||
300 | /* | |
301 | * string items are for debugging. They just store a short string of | |
302 | * data in the FS | |
303 | */ | |
304 | #define BTRFS_STRING_ITEM_KEY 253 | |
305 | ||
306 | ||
307 | ||
308 | /* 32 bytes in various csum fields */ | |
309 | #define BTRFS_CSUM_SIZE 32 | |
310 | ||
311 | /* csum types */ | |
312 | #define BTRFS_CSUM_TYPE_CRC32 0 | |
313 | ||
314 | /* | |
315 | * flags definitions for directory entry item type | |
316 | * | |
317 | * Used by: | |
318 | * struct btrfs_dir_item.type | |
319 | */ | |
320 | #define BTRFS_FT_UNKNOWN 0 | |
321 | #define BTRFS_FT_REG_FILE 1 | |
322 | #define BTRFS_FT_DIR 2 | |
323 | #define BTRFS_FT_CHRDEV 3 | |
324 | #define BTRFS_FT_BLKDEV 4 | |
325 | #define BTRFS_FT_FIFO 5 | |
326 | #define BTRFS_FT_SOCK 6 | |
327 | #define BTRFS_FT_SYMLINK 7 | |
328 | #define BTRFS_FT_XATTR 8 | |
329 | #define BTRFS_FT_MAX 9 | |
330 | ||
331 | /* | |
332 | * The key defines the order in the tree, and so it also defines (optimal) | |
333 | * block layout. | |
334 | * | |
335 | * objectid corresponds to the inode number. | |
336 | * | |
337 | * type tells us things about the object, and is a kind of stream selector. | |
338 | * so for a given inode, keys with type of 1 might refer to the inode data, | |
339 | * type of 2 may point to file data in the btree and type == 3 may point to | |
340 | * extents. | |
341 | * | |
342 | * offset is the starting byte offset for this key in the stream. | |
343 | */ | |
344 | ||
345 | struct btrfs_key { | |
346 | __u64 objectid; | |
347 | __u8 type; | |
348 | __u64 offset; | |
349 | } __attribute__ ((__packed__)); | |
350 | ||
351 | struct btrfs_dev_item { | |
352 | /* the internal btrfs device id */ | |
353 | __u64 devid; | |
354 | ||
355 | /* size of the device */ | |
356 | __u64 total_bytes; | |
357 | ||
358 | /* bytes used */ | |
359 | __u64 bytes_used; | |
360 | ||
361 | /* optimal io alignment for this device */ | |
362 | __u32 io_align; | |
363 | ||
364 | /* optimal io width for this device */ | |
365 | __u32 io_width; | |
366 | ||
367 | /* minimal io size for this device */ | |
368 | __u32 sector_size; | |
369 | ||
370 | /* type and info about this device */ | |
371 | __u64 type; | |
372 | ||
373 | /* expected generation for this device */ | |
374 | __u64 generation; | |
375 | ||
376 | /* | |
377 | * starting byte of this partition on the device, | |
378 | * to allow for stripe alignment in the future | |
379 | */ | |
380 | __u64 start_offset; | |
381 | ||
382 | /* grouping information for allocation decisions */ | |
383 | __u32 dev_group; | |
384 | ||
385 | /* seek speed 0-100 where 100 is fastest */ | |
386 | __u8 seek_speed; | |
387 | ||
388 | /* bandwidth 0-100 where 100 is fastest */ | |
389 | __u8 bandwidth; | |
390 | ||
391 | /* btrfs generated uuid for this device */ | |
392 | __u8 uuid[BTRFS_UUID_SIZE]; | |
393 | ||
394 | /* uuid of FS who owns this device */ | |
395 | __u8 fsid[BTRFS_UUID_SIZE]; | |
396 | } __attribute__ ((__packed__)); | |
397 | ||
398 | struct btrfs_stripe { | |
399 | __u64 devid; | |
400 | __u64 offset; | |
401 | __u8 dev_uuid[BTRFS_UUID_SIZE]; | |
402 | } __attribute__ ((__packed__)); | |
403 | ||
404 | struct btrfs_chunk { | |
405 | /* size of this chunk in bytes */ | |
406 | __u64 length; | |
407 | ||
408 | /* objectid of the root referencing this chunk */ | |
409 | __u64 owner; | |
410 | ||
411 | __u64 stripe_len; | |
412 | __u64 type; | |
413 | ||
414 | /* optimal io alignment for this chunk */ | |
415 | __u32 io_align; | |
416 | ||
417 | /* optimal io width for this chunk */ | |
418 | __u32 io_width; | |
419 | ||
420 | /* minimal io size for this chunk */ | |
421 | __u32 sector_size; | |
422 | ||
423 | /* 2^16 stripes is quite a lot, a second limit is the size of a single | |
424 | * item in the btree | |
425 | */ | |
426 | __u16 num_stripes; | |
427 | ||
428 | /* sub stripes only matter for raid10 */ | |
429 | __u16 sub_stripes; | |
430 | struct btrfs_stripe stripe; | |
431 | /* additional stripes go here */ | |
432 | } __attribute__ ((__packed__)); | |
433 | ||
434 | #define BTRFS_FREE_SPACE_EXTENT 1 | |
435 | #define BTRFS_FREE_SPACE_BITMAP 2 | |
436 | ||
437 | struct btrfs_free_space_entry { | |
438 | __u64 offset; | |
439 | __u64 bytes; | |
440 | __u8 type; | |
441 | } __attribute__ ((__packed__)); | |
442 | ||
443 | struct btrfs_free_space_header { | |
444 | struct btrfs_key location; | |
445 | __u64 generation; | |
446 | __u64 num_entries; | |
447 | __u64 num_bitmaps; | |
448 | } __attribute__ ((__packed__)); | |
449 | ||
450 | #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0) | |
451 | #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1) | |
452 | ||
453 | /* Super block flags */ | |
454 | /* Errors detected */ | |
455 | #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2) | |
456 | ||
457 | #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32) | |
458 | #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33) | |
459 | ||
460 | ||
461 | /* | |
462 | * items in the extent btree are used to record the objectid of the | |
463 | * owner of the block and the number of references | |
464 | */ | |
465 | ||
466 | struct btrfs_extent_item { | |
467 | __u64 refs; | |
468 | __u64 generation; | |
469 | __u64 flags; | |
470 | } __attribute__ ((__packed__)); | |
471 | ||
472 | ||
473 | #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0) | |
474 | #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1) | |
475 | ||
476 | /* following flags only apply to tree blocks */ | |
477 | ||
478 | /* use full backrefs for extent pointers in the block */ | |
479 | #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8) | |
480 | ||
481 | /* | |
482 | * this flag is only used internally by scrub and may be changed at any time | |
483 | * it is only declared here to avoid collisions | |
484 | */ | |
485 | #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48) | |
486 | ||
487 | struct btrfs_tree_block_info { | |
488 | struct btrfs_key key; | |
489 | __u8 level; | |
490 | } __attribute__ ((__packed__)); | |
491 | ||
492 | struct btrfs_extent_data_ref { | |
493 | __u64 root; | |
494 | __u64 objectid; | |
495 | __u64 offset; | |
496 | __u32 count; | |
497 | } __attribute__ ((__packed__)); | |
498 | ||
499 | struct btrfs_shared_data_ref { | |
500 | __u32 count; | |
501 | } __attribute__ ((__packed__)); | |
502 | ||
503 | struct btrfs_extent_inline_ref { | |
504 | __u8 type; | |
505 | __u64 offset; | |
506 | } __attribute__ ((__packed__)); | |
507 | ||
508 | /* dev extents record free space on individual devices. The owner | |
509 | * field points back to the chunk allocation mapping tree that allocated | |
510 | * the extent. The chunk tree uuid field is a way to double check the owner | |
511 | */ | |
512 | struct btrfs_dev_extent { | |
513 | __u64 chunk_tree; | |
514 | __u64 chunk_objectid; | |
515 | __u64 chunk_offset; | |
516 | __u64 length; | |
517 | __u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; | |
518 | } __attribute__ ((__packed__)); | |
519 | ||
520 | struct btrfs_inode_ref { | |
521 | __u64 index; | |
522 | __u16 name_len; | |
523 | /* name goes here */ | |
524 | } __attribute__ ((__packed__)); | |
525 | ||
526 | struct btrfs_inode_extref { | |
527 | __u64 parent_objectid; | |
528 | __u64 index; | |
529 | __u16 name_len; | |
530 | __u8 name[0]; | |
531 | /* name goes here */ | |
532 | } __attribute__ ((__packed__)); | |
533 | ||
534 | struct btrfs_timespec { | |
535 | __u64 sec; | |
536 | __u32 nsec; | |
537 | } __attribute__ ((__packed__)); | |
538 | ||
539 | struct btrfs_inode_item { | |
540 | /* nfs style generation number */ | |
541 | __u64 generation; | |
542 | /* transid that last touched this inode */ | |
543 | __u64 transid; | |
544 | __u64 size; | |
545 | __u64 nbytes; | |
546 | __u64 block_group; | |
547 | __u32 nlink; | |
548 | __u32 uid; | |
549 | __u32 gid; | |
550 | __u32 mode; | |
551 | __u64 rdev; | |
552 | __u64 flags; | |
553 | ||
554 | /* modification sequence number for NFS */ | |
555 | __u64 sequence; | |
556 | ||
557 | /* | |
558 | * a little future expansion, for more than this we can | |
559 | * just grow the inode item and version it | |
560 | */ | |
561 | __u64 reserved[4]; | |
562 | struct btrfs_timespec atime; | |
563 | struct btrfs_timespec ctime; | |
564 | struct btrfs_timespec mtime; | |
565 | struct btrfs_timespec otime; | |
566 | } __attribute__ ((__packed__)); | |
567 | ||
568 | struct btrfs_dir_log_item { | |
569 | __u64 end; | |
570 | } __attribute__ ((__packed__)); | |
571 | ||
572 | struct btrfs_dir_item { | |
573 | struct btrfs_key location; | |
574 | __u64 transid; | |
575 | __u16 data_len; | |
576 | __u16 name_len; | |
577 | __u8 type; | |
578 | } __attribute__ ((__packed__)); | |
579 | ||
580 | #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0) | |
581 | ||
582 | /* | |
583 | * Internal in-memory flag that a subvolume has been marked for deletion but | |
584 | * still visible as a directory | |
585 | */ | |
586 | #define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48) | |
587 | ||
588 | struct btrfs_root_item { | |
589 | struct btrfs_inode_item inode; | |
590 | __u64 generation; | |
591 | __u64 root_dirid; | |
592 | __u64 bytenr; | |
593 | __u64 byte_limit; | |
594 | __u64 bytes_used; | |
595 | __u64 last_snapshot; | |
596 | __u64 flags; | |
597 | __u32 refs; | |
598 | struct btrfs_key drop_progress; | |
599 | __u8 drop_level; | |
600 | __u8 level; | |
601 | ||
602 | /* | |
603 | * The following fields appear after subvol_uuids+subvol_times | |
604 | * were introduced. | |
605 | */ | |
606 | ||
607 | /* | |
608 | * This generation number is used to test if the new fields are valid | |
609 | * and up to date while reading the root item. Every time the root item | |
610 | * is written out, the "generation" field is copied into this field. If | |
611 | * anyone ever mounted the fs with an older kernel, we will have | |
612 | * mismatching generation values here and thus must invalidate the | |
613 | * new fields. See btrfs_update_root and btrfs_find_last_root for | |
614 | * details. | |
615 | * the offset of generation_v2 is also used as the start for the memset | |
616 | * when invalidating the fields. | |
617 | */ | |
618 | __u64 generation_v2; | |
619 | __u8 uuid[BTRFS_UUID_SIZE]; | |
620 | __u8 parent_uuid[BTRFS_UUID_SIZE]; | |
621 | __u8 received_uuid[BTRFS_UUID_SIZE]; | |
622 | __u64 ctransid; /* updated when an inode changes */ | |
623 | __u64 otransid; /* trans when created */ | |
624 | __u64 stransid; /* trans when sent. non-zero for received subvol */ | |
625 | __u64 rtransid; /* trans when received. non-zero for received subvol */ | |
626 | struct btrfs_timespec ctime; | |
627 | struct btrfs_timespec otime; | |
628 | struct btrfs_timespec stime; | |
629 | struct btrfs_timespec rtime; | |
630 | __u64 reserved[8]; /* for future */ | |
631 | } __attribute__ ((__packed__)); | |
632 | ||
633 | /* | |
634 | * this is used for both forward and backward root refs | |
635 | */ | |
636 | struct btrfs_root_ref { | |
637 | __u64 dirid; | |
638 | __u64 sequence; | |
639 | __u16 name_len; | |
640 | } __attribute__ ((__packed__)); | |
641 | ||
642 | #define BTRFS_FILE_EXTENT_INLINE 0 | |
643 | #define BTRFS_FILE_EXTENT_REG 1 | |
644 | #define BTRFS_FILE_EXTENT_PREALLOC 2 | |
645 | ||
646 | enum btrfs_compression_type { | |
647 | BTRFS_COMPRESS_NONE = 0, | |
648 | BTRFS_COMPRESS_ZLIB = 1, | |
649 | BTRFS_COMPRESS_LZO = 2, | |
650 | BTRFS_COMPRESS_TYPES = 2, | |
651 | BTRFS_COMPRESS_LAST = 3, | |
652 | }; | |
653 | ||
654 | struct btrfs_file_extent_item { | |
655 | /* | |
656 | * transaction id that created this extent | |
657 | */ | |
658 | __u64 generation; | |
659 | /* | |
660 | * max number of bytes to hold this extent in ram | |
661 | * when we split a compressed extent we can't know how big | |
662 | * each of the resulting pieces will be. So, this is | |
663 | * an upper limit on the size of the extent in ram instead of | |
664 | * an exact limit. | |
665 | */ | |
666 | __u64 ram_bytes; | |
667 | ||
668 | /* | |
669 | * 32 bits for the various ways we might encode the data, | |
670 | * including compression and encryption. If any of these | |
671 | * are set to something a given disk format doesn't understand | |
672 | * it is treated like an incompat flag for reading and writing, | |
673 | * but not for stat. | |
674 | */ | |
675 | __u8 compression; | |
676 | __u8 encryption; | |
677 | __u16 other_encoding; /* spare for later use */ | |
678 | ||
679 | /* are we inline data or a real extent? */ | |
680 | __u8 type; | |
681 | ||
682 | /* | |
683 | * disk space consumed by the extent, checksum blocks are included | |
684 | * in these numbers | |
685 | * | |
686 | * At this offset in the structure, the inline extent data start. | |
687 | */ | |
688 | __u64 disk_bytenr; | |
689 | __u64 disk_num_bytes; | |
690 | /* | |
691 | * the logical offset in file blocks (no csums) | |
692 | * this extent record is for. This allows a file extent to point | |
693 | * into the middle of an existing extent on disk, sharing it | |
694 | * between two snapshots (useful if some bytes in the middle of the | |
695 | * extent have changed | |
696 | */ | |
697 | __u64 offset; | |
698 | /* | |
699 | * the logical number of file blocks (no csums included). This | |
700 | * always reflects the size uncompressed and without encoding. | |
701 | */ | |
702 | __u64 num_bytes; | |
703 | ||
704 | } __attribute__ ((__packed__)); | |
705 | ||
706 | struct btrfs_csum_item { | |
707 | __u8 csum; | |
708 | } __attribute__ ((__packed__)); | |
709 | ||
710 | /* different types of block groups (and chunks) */ | |
711 | #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0) | |
712 | #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1) | |
713 | #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2) | |
714 | #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3) | |
715 | #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4) | |
716 | #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5) | |
717 | #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6) | |
718 | #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7) | |
719 | #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8) | |
720 | #define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \ | |
721 | BTRFS_SPACE_INFO_GLOBAL_RSV) | |
722 | ||
723 | enum btrfs_raid_types { | |
724 | BTRFS_RAID_RAID10, | |
725 | BTRFS_RAID_RAID1, | |
726 | BTRFS_RAID_DUP, | |
727 | BTRFS_RAID_RAID0, | |
728 | BTRFS_RAID_SINGLE, | |
729 | BTRFS_RAID_RAID5, | |
730 | BTRFS_RAID_RAID6, | |
731 | BTRFS_NR_RAID_TYPES | |
732 | }; | |
733 | ||
734 | #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \ | |
735 | BTRFS_BLOCK_GROUP_SYSTEM | \ | |
736 | BTRFS_BLOCK_GROUP_METADATA) | |
737 | ||
738 | #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \ | |
739 | BTRFS_BLOCK_GROUP_RAID1 | \ | |
740 | BTRFS_BLOCK_GROUP_RAID5 | \ | |
741 | BTRFS_BLOCK_GROUP_RAID6 | \ | |
742 | BTRFS_BLOCK_GROUP_DUP | \ | |
743 | BTRFS_BLOCK_GROUP_RAID10) | |
744 | #define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \ | |
745 | BTRFS_BLOCK_GROUP_RAID6) | |
746 | ||
747 | /* | |
748 | * We need a bit for restriper to be able to tell when chunks of type | |
749 | * SINGLE are available. This "extended" profile format is used in | |
750 | * fs_info->avail_*_alloc_bits (in-memory) and balance item fields | |
751 | * (on-disk). The corresponding on-disk bit in chunk.type is reserved | |
752 | * to avoid remappings between two formats in future. | |
753 | */ | |
754 | #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48) | |
755 | ||
756 | /* | |
757 | * A fake block group type that is used to communicate global block reserve | |
758 | * size to userspace via the SPACE_INFO ioctl. | |
759 | */ | |
760 | #define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49) | |
761 | ||
762 | #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \ | |
763 | BTRFS_AVAIL_ALLOC_BIT_SINGLE) | |
764 | ||
765 | #endif /* __BTRFS_BTRFS_TREE_H__ */ |