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db671160 JM |
1 | #ifndef _BTRFS_CTREE_H_ |
2 | #define _BTRFS_CTREE_H_ | |
3 | ||
4 | /* | |
5 | * This header contains the structure definitions and constants used | |
6 | * by file system objects that can be retrieved using | |
7 | * the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that | |
8 | * is needed to describe a leaf node's key or item contents. | |
9 | */ | |
10 | ||
11 | /* holds pointers to all of the tree roots */ | |
12 | #define BTRFS_ROOT_TREE_OBJECTID 1ULL | |
13 | ||
14 | /* stores information about which extents are in use, and reference counts */ | |
15 | #define BTRFS_EXTENT_TREE_OBJECTID 2ULL | |
16 | ||
17 | /* | |
18 | * chunk tree stores translations from logical -> physical block numbering | |
19 | * the super block points to the chunk tree | |
20 | */ | |
21 | #define BTRFS_CHUNK_TREE_OBJECTID 3ULL | |
22 | ||
23 | /* | |
24 | * stores information about which areas of a given device are in use. | |
25 | * one per device. The tree of tree roots points to the device tree | |
26 | */ | |
27 | #define BTRFS_DEV_TREE_OBJECTID 4ULL | |
28 | ||
29 | /* one per subvolume, storing files and directories */ | |
30 | #define BTRFS_FS_TREE_OBJECTID 5ULL | |
31 | ||
32 | /* directory objectid inside the root tree */ | |
33 | #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL | |
34 | ||
35 | /* holds checksums of all the data extents */ | |
36 | #define BTRFS_CSUM_TREE_OBJECTID 7ULL | |
37 | ||
38 | /* holds quota configuration and tracking */ | |
39 | #define BTRFS_QUOTA_TREE_OBJECTID 8ULL | |
40 | ||
41 | /* for storing items that use the BTRFS_UUID_KEY* types */ | |
42 | #define BTRFS_UUID_TREE_OBJECTID 9ULL | |
43 | ||
44 | /* tracks free space in block groups. */ | |
45 | #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL | |
46 | ||
47 | /* device stats in the device tree */ | |
48 | #define BTRFS_DEV_STATS_OBJECTID 0ULL | |
49 | ||
50 | /* for storing balance parameters in the root tree */ | |
51 | #define BTRFS_BALANCE_OBJECTID -4ULL | |
52 | ||
53 | /* orhpan objectid for tracking unlinked/truncated files */ | |
54 | #define BTRFS_ORPHAN_OBJECTID -5ULL | |
55 | ||
56 | /* does write ahead logging to speed up fsyncs */ | |
57 | #define BTRFS_TREE_LOG_OBJECTID -6ULL | |
58 | #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL | |
59 | ||
60 | /* for space balancing */ | |
61 | #define BTRFS_TREE_RELOC_OBJECTID -8ULL | |
62 | #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL | |
63 | ||
64 | /* | |
65 | * extent checksums all have this objectid | |
66 | * this allows them to share the logging tree | |
67 | * for fsyncs | |
68 | */ | |
69 | #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL | |
70 | ||
71 | /* For storing free space cache */ | |
72 | #define BTRFS_FREE_SPACE_OBJECTID -11ULL | |
73 | ||
74 | /* | |
75 | * The inode number assigned to the special inode for storing | |
76 | * free ino cache | |
77 | */ | |
78 | #define BTRFS_FREE_INO_OBJECTID -12ULL | |
79 | ||
80 | /* dummy objectid represents multiple objectids */ | |
81 | #define BTRFS_MULTIPLE_OBJECTIDS -255ULL | |
82 | ||
83 | /* | |
84 | * All files have objectids in this range. | |
85 | */ | |
86 | #define BTRFS_FIRST_FREE_OBJECTID 256ULL | |
87 | #define BTRFS_LAST_FREE_OBJECTID -256ULL | |
88 | #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL | |
89 | ||
90 | ||
91 | /* | |
92 | * the device items go into the chunk tree. The key is in the form | |
93 | * [ 1 BTRFS_DEV_ITEM_KEY device_id ] | |
94 | */ | |
95 | #define BTRFS_DEV_ITEMS_OBJECTID 1ULL | |
96 | ||
97 | #define BTRFS_BTREE_INODE_OBJECTID 1 | |
98 | ||
99 | #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2 | |
100 | ||
101 | #define BTRFS_DEV_REPLACE_DEVID 0ULL | |
102 | ||
103 | /* | |
104 | * inode items have the data typically returned from stat and store other | |
105 | * info about object characteristics. There is one for every file and dir in | |
106 | * the FS | |
107 | */ | |
108 | #define BTRFS_INODE_ITEM_KEY 1 | |
109 | #define BTRFS_INODE_REF_KEY 12 | |
110 | #define BTRFS_INODE_EXTREF_KEY 13 | |
111 | #define BTRFS_XATTR_ITEM_KEY 24 | |
112 | #define BTRFS_ORPHAN_ITEM_KEY 48 | |
113 | /* reserve 2-15 close to the inode for later flexibility */ | |
114 | ||
115 | /* | |
116 | * dir items are the name -> inode pointers in a directory. There is one | |
117 | * for every name in a directory. | |
118 | */ | |
119 | #define BTRFS_DIR_LOG_ITEM_KEY 60 | |
120 | #define BTRFS_DIR_LOG_INDEX_KEY 72 | |
121 | #define BTRFS_DIR_ITEM_KEY 84 | |
122 | #define BTRFS_DIR_INDEX_KEY 96 | |
123 | /* | |
124 | * extent data is for file data | |
125 | */ | |
126 | #define BTRFS_EXTENT_DATA_KEY 108 | |
127 | ||
128 | /* | |
129 | * extent csums are stored in a separate tree and hold csums for | |
130 | * an entire extent on disk. | |
131 | */ | |
132 | #define BTRFS_EXTENT_CSUM_KEY 128 | |
133 | ||
134 | /* | |
135 | * root items point to tree roots. They are typically in the root | |
136 | * tree used by the super block to find all the other trees | |
137 | */ | |
138 | #define BTRFS_ROOT_ITEM_KEY 132 | |
139 | ||
140 | /* | |
141 | * root backrefs tie subvols and snapshots to the directory entries that | |
142 | * reference them | |
143 | */ | |
144 | #define BTRFS_ROOT_BACKREF_KEY 144 | |
145 | ||
146 | /* | |
147 | * root refs make a fast index for listing all of the snapshots and | |
148 | * subvolumes referenced by a given root. They point directly to the | |
149 | * directory item in the root that references the subvol | |
150 | */ | |
151 | #define BTRFS_ROOT_REF_KEY 156 | |
152 | ||
153 | /* | |
154 | * extent items are in the extent map tree. These record which blocks | |
155 | * are used, and how many references there are to each block | |
156 | */ | |
157 | #define BTRFS_EXTENT_ITEM_KEY 168 | |
158 | ||
159 | /* | |
160 | * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know | |
161 | * the length, so we save the level in key->offset instead of the length. | |
162 | */ | |
163 | #define BTRFS_METADATA_ITEM_KEY 169 | |
164 | ||
165 | #define BTRFS_TREE_BLOCK_REF_KEY 176 | |
166 | ||
167 | #define BTRFS_EXTENT_DATA_REF_KEY 178 | |
168 | ||
169 | #define BTRFS_EXTENT_REF_V0_KEY 180 | |
170 | ||
171 | #define BTRFS_SHARED_BLOCK_REF_KEY 182 | |
172 | ||
173 | #define BTRFS_SHARED_DATA_REF_KEY 184 | |
174 | ||
175 | /* | |
176 | * block groups give us hints into the extent allocation trees. Which | |
177 | * blocks are free etc etc | |
178 | */ | |
179 | #define BTRFS_BLOCK_GROUP_ITEM_KEY 192 | |
180 | ||
181 | /* | |
182 | * Every block group is represented in the free space tree by a free space info | |
183 | * item, which stores some accounting information. It is keyed on | |
184 | * (block_group_start, FREE_SPACE_INFO, block_group_length). | |
185 | */ | |
186 | #define BTRFS_FREE_SPACE_INFO_KEY 198 | |
187 | ||
188 | /* | |
189 | * A free space extent tracks an extent of space that is free in a block group. | |
190 | * It is keyed on (start, FREE_SPACE_EXTENT, length). | |
191 | */ | |
192 | #define BTRFS_FREE_SPACE_EXTENT_KEY 199 | |
193 | ||
194 | /* | |
195 | * When a block group becomes very fragmented, we convert it to use bitmaps | |
196 | * instead of extents. A free space bitmap is keyed on | |
197 | * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with | |
198 | * (length / sectorsize) bits. | |
199 | */ | |
200 | #define BTRFS_FREE_SPACE_BITMAP_KEY 200 | |
201 | ||
202 | #define BTRFS_DEV_EXTENT_KEY 204 | |
203 | #define BTRFS_DEV_ITEM_KEY 216 | |
204 | #define BTRFS_CHUNK_ITEM_KEY 228 | |
205 | ||
206 | /* | |
207 | * Records the overall state of the qgroups. | |
208 | * There's only one instance of this key present, | |
209 | * (0, BTRFS_QGROUP_STATUS_KEY, 0) | |
210 | */ | |
211 | #define BTRFS_QGROUP_STATUS_KEY 240 | |
212 | /* | |
213 | * Records the currently used space of the qgroup. | |
214 | * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid). | |
215 | */ | |
216 | #define BTRFS_QGROUP_INFO_KEY 242 | |
217 | /* | |
218 | * Contains the user configured limits for the qgroup. | |
219 | * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid). | |
220 | */ | |
221 | #define BTRFS_QGROUP_LIMIT_KEY 244 | |
222 | /* | |
223 | * Records the child-parent relationship of qgroups. For | |
224 | * each relation, 2 keys are present: | |
225 | * (childid, BTRFS_QGROUP_RELATION_KEY, parentid) | |
226 | * (parentid, BTRFS_QGROUP_RELATION_KEY, childid) | |
227 | */ | |
228 | #define BTRFS_QGROUP_RELATION_KEY 246 | |
229 | ||
230 | /* | |
231 | * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY. | |
232 | */ | |
233 | #define BTRFS_BALANCE_ITEM_KEY 248 | |
234 | ||
235 | /* | |
236 | * The key type for tree items that are stored persistently, but do not need to | |
237 | * exist for extended period of time. The items can exist in any tree. | |
238 | * | |
239 | * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data] | |
240 | * | |
241 | * Existing items: | |
242 | * | |
243 | * - balance status item | |
244 | * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0) | |
245 | */ | |
246 | #define BTRFS_TEMPORARY_ITEM_KEY 248 | |
247 | ||
248 | /* | |
249 | * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY | |
250 | */ | |
251 | #define BTRFS_DEV_STATS_KEY 249 | |
252 | ||
253 | /* | |
254 | * The key type for tree items that are stored persistently and usually exist | |
255 | * for a long period, eg. filesystem lifetime. The item kinds can be status | |
256 | * information, stats or preference values. The item can exist in any tree. | |
257 | * | |
258 | * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data] | |
259 | * | |
260 | * Existing items: | |
261 | * | |
262 | * - device statistics, store IO stats in the device tree, one key for all | |
263 | * stats | |
264 | * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0) | |
265 | */ | |
266 | #define BTRFS_PERSISTENT_ITEM_KEY 249 | |
267 | ||
268 | /* | |
269 | * Persistantly stores the device replace state in the device tree. | |
270 | * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0). | |
271 | */ | |
272 | #define BTRFS_DEV_REPLACE_KEY 250 | |
273 | ||
274 | /* | |
275 | * Stores items that allow to quickly map UUIDs to something else. | |
276 | * These items are part of the filesystem UUID tree. | |
277 | * The key is built like this: | |
278 | * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits). | |
279 | */ | |
280 | #if BTRFS_UUID_SIZE != 16 | |
281 | #error "UUID items require BTRFS_UUID_SIZE == 16!" | |
282 | #endif | |
283 | #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */ | |
284 | #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to | |
285 | * received subvols */ | |
286 | ||
287 | /* | |
288 | * string items are for debugging. They just store a short string of | |
289 | * data in the FS | |
290 | */ | |
291 | #define BTRFS_STRING_ITEM_KEY 253 | |
292 | ||
293 | ||
294 | ||
295 | /* 32 bytes in various csum fields */ | |
296 | #define BTRFS_CSUM_SIZE 32 | |
297 | ||
298 | /* csum types */ | |
299 | #define BTRFS_CSUM_TYPE_CRC32 0 | |
300 | ||
301 | /* | |
302 | * flags definitions for directory entry item type | |
303 | * | |
304 | * Used by: | |
305 | * struct btrfs_dir_item.type | |
306 | */ | |
307 | #define BTRFS_FT_UNKNOWN 0 | |
308 | #define BTRFS_FT_REG_FILE 1 | |
309 | #define BTRFS_FT_DIR 2 | |
310 | #define BTRFS_FT_CHRDEV 3 | |
311 | #define BTRFS_FT_BLKDEV 4 | |
312 | #define BTRFS_FT_FIFO 5 | |
313 | #define BTRFS_FT_SOCK 6 | |
314 | #define BTRFS_FT_SYMLINK 7 | |
315 | #define BTRFS_FT_XATTR 8 | |
316 | #define BTRFS_FT_MAX 9 | |
317 | ||
318 | /* | |
319 | * The key defines the order in the tree, and so it also defines (optimal) | |
320 | * block layout. | |
321 | * | |
322 | * objectid corresponds to the inode number. | |
323 | * | |
324 | * type tells us things about the object, and is a kind of stream selector. | |
325 | * so for a given inode, keys with type of 1 might refer to the inode data, | |
326 | * type of 2 may point to file data in the btree and type == 3 may point to | |
327 | * extents. | |
328 | * | |
329 | * offset is the starting byte offset for this key in the stream. | |
330 | * | |
331 | * btrfs_disk_key is in disk byte order. struct btrfs_key is always | |
332 | * in cpu native order. Otherwise they are identical and their sizes | |
333 | * should be the same (ie both packed) | |
334 | */ | |
335 | struct btrfs_disk_key { | |
336 | __le64 objectid; | |
14b05c51 | 337 | __u8 type; |
db671160 JM |
338 | __le64 offset; |
339 | } __attribute__ ((__packed__)); | |
340 | ||
341 | struct btrfs_key { | |
14b05c51 JM |
342 | __u64 objectid; |
343 | __u8 type; | |
344 | __u64 offset; | |
db671160 JM |
345 | } __attribute__ ((__packed__)); |
346 | ||
347 | struct btrfs_dev_item { | |
348 | /* the internal btrfs device id */ | |
349 | __le64 devid; | |
350 | ||
351 | /* size of the device */ | |
352 | __le64 total_bytes; | |
353 | ||
354 | /* bytes used */ | |
355 | __le64 bytes_used; | |
356 | ||
357 | /* optimal io alignment for this device */ | |
358 | __le32 io_align; | |
359 | ||
360 | /* optimal io width for this device */ | |
361 | __le32 io_width; | |
362 | ||
363 | /* minimal io size for this device */ | |
364 | __le32 sector_size; | |
365 | ||
366 | /* type and info about this device */ | |
367 | __le64 type; | |
368 | ||
369 | /* expected generation for this device */ | |
370 | __le64 generation; | |
371 | ||
372 | /* | |
373 | * starting byte of this partition on the device, | |
374 | * to allow for stripe alignment in the future | |
375 | */ | |
376 | __le64 start_offset; | |
377 | ||
378 | /* grouping information for allocation decisions */ | |
379 | __le32 dev_group; | |
380 | ||
381 | /* seek speed 0-100 where 100 is fastest */ | |
14b05c51 | 382 | __u8 seek_speed; |
db671160 JM |
383 | |
384 | /* bandwidth 0-100 where 100 is fastest */ | |
14b05c51 | 385 | __u8 bandwidth; |
db671160 JM |
386 | |
387 | /* btrfs generated uuid for this device */ | |
14b05c51 | 388 | __u8 uuid[BTRFS_UUID_SIZE]; |
db671160 JM |
389 | |
390 | /* uuid of FS who owns this device */ | |
14b05c51 | 391 | __u8 fsid[BTRFS_UUID_SIZE]; |
db671160 JM |
392 | } __attribute__ ((__packed__)); |
393 | ||
394 | struct btrfs_stripe { | |
395 | __le64 devid; | |
396 | __le64 offset; | |
14b05c51 | 397 | __u8 dev_uuid[BTRFS_UUID_SIZE]; |
db671160 JM |
398 | } __attribute__ ((__packed__)); |
399 | ||
400 | struct btrfs_chunk { | |
401 | /* size of this chunk in bytes */ | |
402 | __le64 length; | |
403 | ||
404 | /* objectid of the root referencing this chunk */ | |
405 | __le64 owner; | |
406 | ||
407 | __le64 stripe_len; | |
408 | __le64 type; | |
409 | ||
410 | /* optimal io alignment for this chunk */ | |
411 | __le32 io_align; | |
412 | ||
413 | /* optimal io width for this chunk */ | |
414 | __le32 io_width; | |
415 | ||
416 | /* minimal io size for this chunk */ | |
417 | __le32 sector_size; | |
418 | ||
419 | /* 2^16 stripes is quite a lot, a second limit is the size of a single | |
420 | * item in the btree | |
421 | */ | |
422 | __le16 num_stripes; | |
423 | ||
424 | /* sub stripes only matter for raid10 */ | |
425 | __le16 sub_stripes; | |
426 | struct btrfs_stripe stripe; | |
427 | /* additional stripes go here */ | |
428 | } __attribute__ ((__packed__)); | |
429 | ||
430 | #define BTRFS_FREE_SPACE_EXTENT 1 | |
431 | #define BTRFS_FREE_SPACE_BITMAP 2 | |
432 | ||
433 | struct btrfs_free_space_entry { | |
434 | __le64 offset; | |
435 | __le64 bytes; | |
14b05c51 | 436 | __u8 type; |
db671160 JM |
437 | } __attribute__ ((__packed__)); |
438 | ||
439 | struct btrfs_free_space_header { | |
440 | struct btrfs_disk_key location; | |
441 | __le64 generation; | |
442 | __le64 num_entries; | |
443 | __le64 num_bitmaps; | |
444 | } __attribute__ ((__packed__)); | |
445 | ||
446 | #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0) | |
447 | #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1) | |
448 | ||
449 | /* Super block flags */ | |
450 | /* Errors detected */ | |
451 | #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2) | |
452 | ||
453 | #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32) | |
454 | #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33) | |
455 | ||
456 | ||
457 | /* | |
458 | * items in the extent btree are used to record the objectid of the | |
459 | * owner of the block and the number of references | |
460 | */ | |
461 | ||
462 | struct btrfs_extent_item { | |
463 | __le64 refs; | |
464 | __le64 generation; | |
465 | __le64 flags; | |
466 | } __attribute__ ((__packed__)); | |
467 | ||
468 | struct btrfs_extent_item_v0 { | |
469 | __le32 refs; | |
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_disk_key key; | |
14b05c51 | 489 | __u8 level; |
db671160 JM |
490 | } __attribute__ ((__packed__)); |
491 | ||
492 | struct btrfs_extent_data_ref { | |
493 | __le64 root; | |
494 | __le64 objectid; | |
495 | __le64 offset; | |
496 | __le32 count; | |
497 | } __attribute__ ((__packed__)); | |
498 | ||
499 | struct btrfs_shared_data_ref { | |
500 | __le32 count; | |
501 | } __attribute__ ((__packed__)); | |
502 | ||
503 | struct btrfs_extent_inline_ref { | |
14b05c51 | 504 | __u8 type; |
db671160 JM |
505 | __le64 offset; |
506 | } __attribute__ ((__packed__)); | |
507 | ||
508 | /* old style backrefs item */ | |
509 | struct btrfs_extent_ref_v0 { | |
510 | __le64 root; | |
511 | __le64 generation; | |
512 | __le64 objectid; | |
513 | __le32 count; | |
514 | } __attribute__ ((__packed__)); | |
515 | ||
516 | ||
517 | /* dev extents record free space on individual devices. The owner | |
518 | * field points back to the chunk allocation mapping tree that allocated | |
519 | * the extent. The chunk tree uuid field is a way to double check the owner | |
520 | */ | |
521 | struct btrfs_dev_extent { | |
522 | __le64 chunk_tree; | |
523 | __le64 chunk_objectid; | |
524 | __le64 chunk_offset; | |
525 | __le64 length; | |
14b05c51 | 526 | __u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; |
db671160 JM |
527 | } __attribute__ ((__packed__)); |
528 | ||
529 | struct btrfs_inode_ref { | |
530 | __le64 index; | |
531 | __le16 name_len; | |
532 | /* name goes here */ | |
533 | } __attribute__ ((__packed__)); | |
534 | ||
535 | struct btrfs_inode_extref { | |
536 | __le64 parent_objectid; | |
537 | __le64 index; | |
538 | __le16 name_len; | |
539 | __u8 name[0]; | |
540 | /* name goes here */ | |
541 | } __attribute__ ((__packed__)); | |
542 | ||
543 | struct btrfs_timespec { | |
544 | __le64 sec; | |
545 | __le32 nsec; | |
546 | } __attribute__ ((__packed__)); | |
547 | ||
548 | struct btrfs_inode_item { | |
549 | /* nfs style generation number */ | |
550 | __le64 generation; | |
551 | /* transid that last touched this inode */ | |
552 | __le64 transid; | |
553 | __le64 size; | |
554 | __le64 nbytes; | |
555 | __le64 block_group; | |
556 | __le32 nlink; | |
557 | __le32 uid; | |
558 | __le32 gid; | |
559 | __le32 mode; | |
560 | __le64 rdev; | |
561 | __le64 flags; | |
562 | ||
563 | /* modification sequence number for NFS */ | |
564 | __le64 sequence; | |
565 | ||
566 | /* | |
567 | * a little future expansion, for more than this we can | |
568 | * just grow the inode item and version it | |
569 | */ | |
570 | __le64 reserved[4]; | |
571 | struct btrfs_timespec atime; | |
572 | struct btrfs_timespec ctime; | |
573 | struct btrfs_timespec mtime; | |
574 | struct btrfs_timespec otime; | |
575 | } __attribute__ ((__packed__)); | |
576 | ||
577 | struct btrfs_dir_log_item { | |
578 | __le64 end; | |
579 | } __attribute__ ((__packed__)); | |
580 | ||
581 | struct btrfs_dir_item { | |
582 | struct btrfs_disk_key location; | |
583 | __le64 transid; | |
584 | __le16 data_len; | |
585 | __le16 name_len; | |
14b05c51 | 586 | __u8 type; |
db671160 JM |
587 | } __attribute__ ((__packed__)); |
588 | ||
589 | #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0) | |
590 | ||
591 | /* | |
592 | * Internal in-memory flag that a subvolume has been marked for deletion but | |
593 | * still visible as a directory | |
594 | */ | |
595 | #define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48) | |
596 | ||
597 | struct btrfs_root_item { | |
598 | struct btrfs_inode_item inode; | |
599 | __le64 generation; | |
600 | __le64 root_dirid; | |
601 | __le64 bytenr; | |
602 | __le64 byte_limit; | |
603 | __le64 bytes_used; | |
604 | __le64 last_snapshot; | |
605 | __le64 flags; | |
606 | __le32 refs; | |
607 | struct btrfs_disk_key drop_progress; | |
14b05c51 JM |
608 | __u8 drop_level; |
609 | __u8 level; | |
db671160 JM |
610 | |
611 | /* | |
612 | * The following fields appear after subvol_uuids+subvol_times | |
613 | * were introduced. | |
614 | */ | |
615 | ||
616 | /* | |
617 | * This generation number is used to test if the new fields are valid | |
618 | * and up to date while reading the root item. Every time the root item | |
619 | * is written out, the "generation" field is copied into this field. If | |
620 | * anyone ever mounted the fs with an older kernel, we will have | |
621 | * mismatching generation values here and thus must invalidate the | |
622 | * new fields. See btrfs_update_root and btrfs_find_last_root for | |
623 | * details. | |
624 | * the offset of generation_v2 is also used as the start for the memset | |
625 | * when invalidating the fields. | |
626 | */ | |
627 | __le64 generation_v2; | |
14b05c51 JM |
628 | __u8 uuid[BTRFS_UUID_SIZE]; |
629 | __u8 parent_uuid[BTRFS_UUID_SIZE]; | |
630 | __u8 received_uuid[BTRFS_UUID_SIZE]; | |
db671160 JM |
631 | __le64 ctransid; /* updated when an inode changes */ |
632 | __le64 otransid; /* trans when created */ | |
633 | __le64 stransid; /* trans when sent. non-zero for received subvol */ | |
634 | __le64 rtransid; /* trans when received. non-zero for received subvol */ | |
635 | struct btrfs_timespec ctime; | |
636 | struct btrfs_timespec otime; | |
637 | struct btrfs_timespec stime; | |
638 | struct btrfs_timespec rtime; | |
639 | __le64 reserved[8]; /* for future */ | |
640 | } __attribute__ ((__packed__)); | |
641 | ||
642 | /* | |
643 | * this is used for both forward and backward root refs | |
644 | */ | |
645 | struct btrfs_root_ref { | |
646 | __le64 dirid; | |
647 | __le64 sequence; | |
648 | __le16 name_len; | |
649 | } __attribute__ ((__packed__)); | |
650 | ||
651 | struct btrfs_disk_balance_args { | |
652 | /* | |
653 | * profiles to operate on, single is denoted by | |
654 | * BTRFS_AVAIL_ALLOC_BIT_SINGLE | |
655 | */ | |
656 | __le64 profiles; | |
657 | ||
658 | /* | |
659 | * usage filter | |
660 | * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N' | |
661 | * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max | |
662 | */ | |
663 | union { | |
664 | __le64 usage; | |
665 | struct { | |
666 | __le32 usage_min; | |
667 | __le32 usage_max; | |
668 | }; | |
669 | }; | |
670 | ||
671 | /* devid filter */ | |
672 | __le64 devid; | |
673 | ||
674 | /* devid subset filter [pstart..pend) */ | |
675 | __le64 pstart; | |
676 | __le64 pend; | |
677 | ||
678 | /* btrfs virtual address space subset filter [vstart..vend) */ | |
679 | __le64 vstart; | |
680 | __le64 vend; | |
681 | ||
682 | /* | |
683 | * profile to convert to, single is denoted by | |
684 | * BTRFS_AVAIL_ALLOC_BIT_SINGLE | |
685 | */ | |
686 | __le64 target; | |
687 | ||
688 | /* BTRFS_BALANCE_ARGS_* */ | |
689 | __le64 flags; | |
690 | ||
691 | /* | |
692 | * BTRFS_BALANCE_ARGS_LIMIT with value 'limit' | |
693 | * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum | |
694 | * and maximum | |
695 | */ | |
696 | union { | |
697 | __le64 limit; | |
698 | struct { | |
699 | __le32 limit_min; | |
700 | __le32 limit_max; | |
701 | }; | |
702 | }; | |
703 | ||
704 | /* | |
705 | * Process chunks that cross stripes_min..stripes_max devices, | |
706 | * BTRFS_BALANCE_ARGS_STRIPES_RANGE | |
707 | */ | |
708 | __le32 stripes_min; | |
709 | __le32 stripes_max; | |
710 | ||
711 | __le64 unused[6]; | |
712 | } __attribute__ ((__packed__)); | |
713 | ||
714 | /* | |
715 | * store balance parameters to disk so that balance can be properly | |
716 | * resumed after crash or unmount | |
717 | */ | |
718 | struct btrfs_balance_item { | |
719 | /* BTRFS_BALANCE_* */ | |
720 | __le64 flags; | |
721 | ||
722 | struct btrfs_disk_balance_args data; | |
723 | struct btrfs_disk_balance_args meta; | |
724 | struct btrfs_disk_balance_args sys; | |
725 | ||
726 | __le64 unused[4]; | |
727 | } __attribute__ ((__packed__)); | |
728 | ||
729 | #define BTRFS_FILE_EXTENT_INLINE 0 | |
730 | #define BTRFS_FILE_EXTENT_REG 1 | |
731 | #define BTRFS_FILE_EXTENT_PREALLOC 2 | |
732 | ||
733 | struct btrfs_file_extent_item { | |
734 | /* | |
735 | * transaction id that created this extent | |
736 | */ | |
737 | __le64 generation; | |
738 | /* | |
739 | * max number of bytes to hold this extent in ram | |
740 | * when we split a compressed extent we can't know how big | |
741 | * each of the resulting pieces will be. So, this is | |
742 | * an upper limit on the size of the extent in ram instead of | |
743 | * an exact limit. | |
744 | */ | |
745 | __le64 ram_bytes; | |
746 | ||
747 | /* | |
748 | * 32 bits for the various ways we might encode the data, | |
749 | * including compression and encryption. If any of these | |
750 | * are set to something a given disk format doesn't understand | |
751 | * it is treated like an incompat flag for reading and writing, | |
752 | * but not for stat. | |
753 | */ | |
14b05c51 JM |
754 | __u8 compression; |
755 | __u8 encryption; | |
db671160 JM |
756 | __le16 other_encoding; /* spare for later use */ |
757 | ||
758 | /* are we inline data or a real extent? */ | |
14b05c51 | 759 | __u8 type; |
db671160 JM |
760 | |
761 | /* | |
762 | * disk space consumed by the extent, checksum blocks are included | |
763 | * in these numbers | |
764 | * | |
765 | * At this offset in the structure, the inline extent data start. | |
766 | */ | |
767 | __le64 disk_bytenr; | |
768 | __le64 disk_num_bytes; | |
769 | /* | |
770 | * the logical offset in file blocks (no csums) | |
771 | * this extent record is for. This allows a file extent to point | |
772 | * into the middle of an existing extent on disk, sharing it | |
773 | * between two snapshots (useful if some bytes in the middle of the | |
774 | * extent have changed | |
775 | */ | |
776 | __le64 offset; | |
777 | /* | |
778 | * the logical number of file blocks (no csums included). This | |
779 | * always reflects the size uncompressed and without encoding. | |
780 | */ | |
781 | __le64 num_bytes; | |
782 | ||
783 | } __attribute__ ((__packed__)); | |
784 | ||
785 | struct btrfs_csum_item { | |
14b05c51 | 786 | __u8 csum; |
db671160 JM |
787 | } __attribute__ ((__packed__)); |
788 | ||
789 | struct btrfs_dev_stats_item { | |
790 | /* | |
791 | * grow this item struct at the end for future enhancements and keep | |
792 | * the existing values unchanged | |
793 | */ | |
794 | __le64 values[BTRFS_DEV_STAT_VALUES_MAX]; | |
795 | } __attribute__ ((__packed__)); | |
796 | ||
797 | #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0 | |
798 | #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1 | |
799 | #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0 | |
800 | #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1 | |
801 | #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2 | |
802 | #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3 | |
803 | #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4 | |
804 | ||
805 | struct btrfs_dev_replace_item { | |
806 | /* | |
807 | * grow this item struct at the end for future enhancements and keep | |
808 | * the existing values unchanged | |
809 | */ | |
810 | __le64 src_devid; | |
811 | __le64 cursor_left; | |
812 | __le64 cursor_right; | |
813 | __le64 cont_reading_from_srcdev_mode; | |
814 | ||
815 | __le64 replace_state; | |
816 | __le64 time_started; | |
817 | __le64 time_stopped; | |
818 | __le64 num_write_errors; | |
819 | __le64 num_uncorrectable_read_errors; | |
820 | } __attribute__ ((__packed__)); | |
821 | ||
822 | /* different types of block groups (and chunks) */ | |
823 | #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0) | |
824 | #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1) | |
825 | #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2) | |
826 | #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3) | |
827 | #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4) | |
828 | #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5) | |
829 | #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6) | |
830 | #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7) | |
831 | #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8) | |
832 | #define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \ | |
833 | BTRFS_SPACE_INFO_GLOBAL_RSV) | |
834 | ||
835 | enum btrfs_raid_types { | |
836 | BTRFS_RAID_RAID10, | |
837 | BTRFS_RAID_RAID1, | |
838 | BTRFS_RAID_DUP, | |
839 | BTRFS_RAID_RAID0, | |
840 | BTRFS_RAID_SINGLE, | |
841 | BTRFS_RAID_RAID5, | |
842 | BTRFS_RAID_RAID6, | |
843 | BTRFS_NR_RAID_TYPES | |
844 | }; | |
845 | ||
846 | #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \ | |
847 | BTRFS_BLOCK_GROUP_SYSTEM | \ | |
848 | BTRFS_BLOCK_GROUP_METADATA) | |
849 | ||
850 | #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \ | |
851 | BTRFS_BLOCK_GROUP_RAID1 | \ | |
852 | BTRFS_BLOCK_GROUP_RAID5 | \ | |
853 | BTRFS_BLOCK_GROUP_RAID6 | \ | |
854 | BTRFS_BLOCK_GROUP_DUP | \ | |
855 | BTRFS_BLOCK_GROUP_RAID10) | |
856 | #define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \ | |
857 | BTRFS_BLOCK_GROUP_RAID6) | |
858 | ||
859 | /* | |
860 | * We need a bit for restriper to be able to tell when chunks of type | |
861 | * SINGLE are available. This "extended" profile format is used in | |
862 | * fs_info->avail_*_alloc_bits (in-memory) and balance item fields | |
863 | * (on-disk). The corresponding on-disk bit in chunk.type is reserved | |
864 | * to avoid remappings between two formats in future. | |
865 | */ | |
866 | #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48) | |
867 | ||
868 | /* | |
869 | * A fake block group type that is used to communicate global block reserve | |
870 | * size to userspace via the SPACE_INFO ioctl. | |
871 | */ | |
872 | #define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49) | |
873 | ||
874 | #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \ | |
875 | BTRFS_AVAIL_ALLOC_BIT_SINGLE) | |
876 | ||
14b05c51 | 877 | static inline __u64 chunk_to_extended(__u64 flags) |
db671160 JM |
878 | { |
879 | if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0) | |
880 | flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE; | |
881 | ||
882 | return flags; | |
883 | } | |
14b05c51 | 884 | static inline __u64 extended_to_chunk(__u64 flags) |
db671160 JM |
885 | { |
886 | return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE; | |
887 | } | |
888 | ||
889 | struct btrfs_block_group_item { | |
890 | __le64 used; | |
891 | __le64 chunk_objectid; | |
892 | __le64 flags; | |
893 | } __attribute__ ((__packed__)); | |
894 | ||
895 | struct btrfs_free_space_info { | |
896 | __le32 extent_count; | |
897 | __le32 flags; | |
898 | } __attribute__ ((__packed__)); | |
899 | ||
900 | #define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0) | |
901 | ||
902 | #define BTRFS_QGROUP_LEVEL_SHIFT 48 | |
14b05c51 | 903 | static inline __u64 btrfs_qgroup_level(__u64 qgroupid) |
db671160 JM |
904 | { |
905 | return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT; | |
906 | } | |
907 | ||
908 | /* | |
909 | * is subvolume quota turned on? | |
910 | */ | |
911 | #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0) | |
912 | /* | |
913 | * RESCAN is set during the initialization phase | |
914 | */ | |
915 | #define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1) | |
916 | /* | |
917 | * Some qgroup entries are known to be out of date, | |
918 | * either because the configuration has changed in a way that | |
919 | * makes a rescan necessary, or because the fs has been mounted | |
920 | * with a non-qgroup-aware version. | |
921 | * Turning qouta off and on again makes it inconsistent, too. | |
922 | */ | |
923 | #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2) | |
924 | ||
925 | #define BTRFS_QGROUP_STATUS_VERSION 1 | |
926 | ||
927 | struct btrfs_qgroup_status_item { | |
928 | __le64 version; | |
929 | /* | |
930 | * the generation is updated during every commit. As older | |
931 | * versions of btrfs are not aware of qgroups, it will be | |
932 | * possible to detect inconsistencies by checking the | |
933 | * generation on mount time | |
934 | */ | |
935 | __le64 generation; | |
936 | ||
937 | /* flag definitions see above */ | |
938 | __le64 flags; | |
939 | ||
940 | /* | |
941 | * only used during scanning to record the progress | |
942 | * of the scan. It contains a logical address | |
943 | */ | |
944 | __le64 rescan; | |
945 | } __attribute__ ((__packed__)); | |
946 | ||
947 | struct btrfs_qgroup_info_item { | |
948 | __le64 generation; | |
949 | __le64 rfer; | |
950 | __le64 rfer_cmpr; | |
951 | __le64 excl; | |
952 | __le64 excl_cmpr; | |
953 | } __attribute__ ((__packed__)); | |
954 | ||
955 | struct btrfs_qgroup_limit_item { | |
956 | /* | |
957 | * only updated when any of the other values change | |
958 | */ | |
959 | __le64 flags; | |
960 | __le64 max_rfer; | |
961 | __le64 max_excl; | |
962 | __le64 rsv_rfer; | |
963 | __le64 rsv_excl; | |
964 | } __attribute__ ((__packed__)); | |
965 | ||
966 | #endif /* _BTRFS_CTREE_H_ */ |