Commit | Line | Data |
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234b63a0 CM |
1 | #ifndef __BTRFS__ |
2 | #define __BTRFS__ | |
eb60ceac | 3 | |
ed2ff2cb | 4 | #include "list.h" |
e2fa7227 | 5 | #include "kerncompat.h" |
ed2ff2cb | 6 | |
3768f368 | 7 | #define BTRFS_MAGIC "_BtRfS_M" |
eb60ceac | 8 | |
3768f368 CM |
9 | #define BTRFS_ROOT_TREE_OBJECTID 1 |
10 | #define BTRFS_EXTENT_TREE_OBJECTID 2 | |
11 | #define BTRFS_FS_TREE_OBJECTID 3 | |
12 | ||
fec577fb CM |
13 | /* |
14 | * the key defines the order in the tree, and so it also defines (optimal) | |
15 | * block layout. objectid corresonds to the inode number. The flags | |
16 | * tells us things about the object, and is a kind of stream selector. | |
17 | * so for a given inode, keys with flags of 1 might refer to the inode | |
18 | * data, flags of 2 may point to file data in the btree and flags == 3 | |
19 | * may point to extents. | |
20 | * | |
21 | * offset is the starting byte offset for this key in the stream. | |
e2fa7227 CM |
22 | * |
23 | * btrfs_disk_key is in disk byte order. struct btrfs_key is always | |
24 | * in cpu native order. Otherwise they are identical and their sizes | |
25 | * should be the same (ie both packed) | |
fec577fb | 26 | */ |
e2fa7227 CM |
27 | struct btrfs_disk_key { |
28 | __le64 objectid; | |
e2fa7227 | 29 | __le64 offset; |
a1516c89 | 30 | __le32 flags; |
e2fa7227 CM |
31 | } __attribute__ ((__packed__)); |
32 | ||
33 | struct btrfs_key { | |
eb60ceac | 34 | u64 objectid; |
eb60ceac | 35 | u64 offset; |
a1516c89 | 36 | u32 flags; |
eb60ceac CM |
37 | } __attribute__ ((__packed__)); |
38 | ||
fec577fb CM |
39 | /* |
40 | * every tree block (leaf or node) starts with this header. | |
41 | */ | |
bb492bb0 | 42 | struct btrfs_header { |
3768f368 | 43 | u8 fsid[16]; /* FS specific uuid */ |
bb492bb0 CM |
44 | __le64 blocknr; /* which block this node is supposed to live in */ |
45 | __le64 parentid; /* objectid of the tree root */ | |
46 | __le32 csum; | |
47 | __le32 ham; | |
48 | __le16 nritems; | |
49 | __le16 flags; | |
fec577fb | 50 | /* generation flags to be added */ |
eb60ceac CM |
51 | } __attribute__ ((__packed__)); |
52 | ||
234b63a0 | 53 | #define BTRFS_MAX_LEVEL 8 |
123abc88 CM |
54 | #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \ |
55 | sizeof(struct btrfs_header)) / \ | |
56 | (sizeof(struct btrfs_disk_key) + sizeof(u64))) | |
57 | #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header)) | |
58 | #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize)) | |
eb60ceac | 59 | |
234b63a0 | 60 | struct btrfs_buffer; |
d97e63b6 | 61 | |
3768f368 CM |
62 | struct btrfs_root_item { |
63 | __le64 blocknr; | |
64 | __le32 flags; | |
65 | __le64 block_limit; | |
66 | __le64 blocks_used; | |
67 | __le32 refs; | |
68 | }; | |
69 | ||
fec577fb CM |
70 | /* |
71 | * in ram representation of the tree. extent_root is used for all allocations | |
72 | * and for the extent tree extent_root root. current_insert is used | |
73 | * only for the extent tree. | |
74 | */ | |
234b63a0 CM |
75 | struct btrfs_root { |
76 | struct btrfs_buffer *node; | |
77 | struct btrfs_buffer *commit_root; | |
78 | struct btrfs_root *extent_root; | |
3768f368 | 79 | struct btrfs_root *tree_root; |
e2fa7227 CM |
80 | struct btrfs_key current_insert; |
81 | struct btrfs_key last_insert; | |
eb60ceac CM |
82 | int fp; |
83 | struct radix_tree_root cache_radix; | |
a28ec197 | 84 | struct radix_tree_root pinned_radix; |
ed2ff2cb CM |
85 | struct list_head trans; |
86 | struct list_head cache; | |
87 | int cache_size; | |
3768f368 CM |
88 | int ref_cows; |
89 | struct btrfs_root_item root_item; | |
90 | struct btrfs_key root_key; | |
123abc88 | 91 | u32 blocksize; |
eb60ceac CM |
92 | }; |
93 | ||
fec577fb CM |
94 | /* |
95 | * the super block basically lists the main trees of the FS | |
96 | * it currently lacks any block count etc etc | |
97 | */ | |
234b63a0 | 98 | struct btrfs_super_block { |
3768f368 CM |
99 | u8 fsid[16]; /* FS specific uuid */ |
100 | __le64 blocknr; /* this block number */ | |
101 | __le32 csum; | |
102 | __le64 magic; | |
123abc88 | 103 | __le32 blocksize; |
3768f368 CM |
104 | __le64 generation; |
105 | __le64 root; | |
106 | __le64 total_blocks; | |
107 | __le64 blocks_used; | |
cfaa7295 CM |
108 | } __attribute__ ((__packed__)); |
109 | ||
fec577fb CM |
110 | /* |
111 | * A leaf is full of items. The exact type of item is defined by | |
112 | * the key flags parameter. offset and size tell us where to find | |
113 | * the item in the leaf (relative to the start of the data area) | |
114 | */ | |
0783fcfc | 115 | struct btrfs_item { |
e2fa7227 | 116 | struct btrfs_disk_key key; |
123abc88 | 117 | __le32 offset; |
0783fcfc | 118 | __le16 size; |
eb60ceac CM |
119 | } __attribute__ ((__packed__)); |
120 | ||
fec577fb CM |
121 | /* |
122 | * leaves have an item area and a data area: | |
123 | * [item0, item1....itemN] [free space] [dataN...data1, data0] | |
124 | * | |
125 | * The data is separate from the items to get the keys closer together | |
126 | * during searches. | |
127 | */ | |
234b63a0 | 128 | struct btrfs_leaf { |
bb492bb0 | 129 | struct btrfs_header header; |
123abc88 | 130 | struct btrfs_item items[]; |
eb60ceac CM |
131 | } __attribute__ ((__packed__)); |
132 | ||
fec577fb CM |
133 | /* |
134 | * all non-leaf blocks are nodes, they hold only keys and pointers to | |
135 | * other blocks | |
136 | */ | |
123abc88 CM |
137 | struct btrfs_key_ptr { |
138 | struct btrfs_disk_key key; | |
139 | __le64 blockptr; | |
140 | } __attribute__ ((__packed__)); | |
141 | ||
234b63a0 | 142 | struct btrfs_node { |
bb492bb0 | 143 | struct btrfs_header header; |
123abc88 | 144 | struct btrfs_key_ptr ptrs[]; |
eb60ceac CM |
145 | } __attribute__ ((__packed__)); |
146 | ||
fec577fb CM |
147 | /* |
148 | * items in the extent btree are used to record the objectid of the | |
149 | * owner of the block and the number of references | |
150 | */ | |
234b63a0 | 151 | struct btrfs_extent_item { |
cf27e1ee CM |
152 | __le32 refs; |
153 | __le64 owner; | |
d97e63b6 CM |
154 | } __attribute__ ((__packed__)); |
155 | ||
fec577fb | 156 | /* |
234b63a0 CM |
157 | * btrfs_paths remember the path taken from the root down to the leaf. |
158 | * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point | |
fec577fb CM |
159 | * to any other levels that are present. |
160 | * | |
161 | * The slots array records the index of the item or block pointer | |
162 | * used while walking the tree. | |
163 | */ | |
234b63a0 CM |
164 | struct btrfs_path { |
165 | struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL]; | |
166 | int slots[BTRFS_MAX_LEVEL]; | |
eb60ceac | 167 | }; |
5de08d7d | 168 | |
234b63a0 | 169 | static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei) |
cf27e1ee CM |
170 | { |
171 | return le64_to_cpu(ei->owner); | |
172 | } | |
173 | ||
234b63a0 | 174 | static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val) |
cf27e1ee CM |
175 | { |
176 | ei->owner = cpu_to_le64(val); | |
177 | } | |
178 | ||
234b63a0 | 179 | static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei) |
cf27e1ee CM |
180 | { |
181 | return le32_to_cpu(ei->refs); | |
182 | } | |
183 | ||
234b63a0 | 184 | static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val) |
cf27e1ee CM |
185 | { |
186 | ei->refs = cpu_to_le32(val); | |
187 | } | |
188 | ||
234b63a0 | 189 | static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr) |
1d4f8a0c | 190 | { |
123abc88 | 191 | return le64_to_cpu(n->ptrs[nr].blockptr); |
1d4f8a0c CM |
192 | } |
193 | ||
234b63a0 CM |
194 | static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr, |
195 | u64 val) | |
1d4f8a0c | 196 | { |
123abc88 | 197 | n->ptrs[nr].blockptr = cpu_to_le64(val); |
1d4f8a0c CM |
198 | } |
199 | ||
123abc88 | 200 | static inline u32 btrfs_item_offset(struct btrfs_item *item) |
0783fcfc | 201 | { |
123abc88 | 202 | return le32_to_cpu(item->offset); |
0783fcfc CM |
203 | } |
204 | ||
123abc88 | 205 | static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val) |
0783fcfc | 206 | { |
123abc88 | 207 | item->offset = cpu_to_le32(val); |
0783fcfc CM |
208 | } |
209 | ||
123abc88 | 210 | static inline u32 btrfs_item_end(struct btrfs_item *item) |
0783fcfc | 211 | { |
123abc88 | 212 | return le32_to_cpu(item->offset) + le16_to_cpu(item->size); |
0783fcfc CM |
213 | } |
214 | ||
215 | static inline u16 btrfs_item_size(struct btrfs_item *item) | |
216 | { | |
217 | return le16_to_cpu(item->size); | |
218 | } | |
219 | ||
220 | static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val) | |
221 | { | |
222 | item->size = cpu_to_le16(val); | |
223 | } | |
224 | ||
e2fa7227 CM |
225 | static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, |
226 | struct btrfs_disk_key *disk) | |
227 | { | |
228 | cpu->offset = le64_to_cpu(disk->offset); | |
229 | cpu->flags = le32_to_cpu(disk->flags); | |
230 | cpu->objectid = le64_to_cpu(disk->objectid); | |
231 | } | |
232 | ||
233 | static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, | |
234 | struct btrfs_key *cpu) | |
235 | { | |
236 | disk->offset = cpu_to_le64(cpu->offset); | |
237 | disk->flags = cpu_to_le32(cpu->flags); | |
238 | disk->objectid = cpu_to_le64(cpu->objectid); | |
239 | } | |
240 | ||
241 | static inline u64 btrfs_key_objectid(struct btrfs_disk_key *disk) | |
242 | { | |
243 | return le64_to_cpu(disk->objectid); | |
244 | } | |
245 | ||
246 | static inline void btrfs_set_key_objectid(struct btrfs_disk_key *disk, | |
247 | u64 val) | |
248 | { | |
249 | disk->objectid = cpu_to_le64(val); | |
250 | } | |
251 | ||
252 | static inline u64 btrfs_key_offset(struct btrfs_disk_key *disk) | |
253 | { | |
254 | return le64_to_cpu(disk->offset); | |
255 | } | |
256 | ||
257 | static inline void btrfs_set_key_offset(struct btrfs_disk_key *disk, | |
258 | u64 val) | |
259 | { | |
260 | disk->offset = cpu_to_le64(val); | |
261 | } | |
262 | ||
263 | static inline u32 btrfs_key_flags(struct btrfs_disk_key *disk) | |
264 | { | |
265 | return le32_to_cpu(disk->flags); | |
266 | } | |
267 | ||
268 | static inline void btrfs_set_key_flags(struct btrfs_disk_key *disk, | |
269 | u32 val) | |
270 | { | |
271 | disk->flags = cpu_to_le32(val); | |
272 | } | |
273 | ||
bb492bb0 | 274 | static inline u64 btrfs_header_blocknr(struct btrfs_header *h) |
7518a238 | 275 | { |
bb492bb0 | 276 | return le64_to_cpu(h->blocknr); |
7518a238 CM |
277 | } |
278 | ||
bb492bb0 | 279 | static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr) |
7518a238 | 280 | { |
bb492bb0 | 281 | h->blocknr = cpu_to_le64(blocknr); |
7518a238 CM |
282 | } |
283 | ||
bb492bb0 | 284 | static inline u64 btrfs_header_parentid(struct btrfs_header *h) |
7518a238 | 285 | { |
bb492bb0 | 286 | return le64_to_cpu(h->parentid); |
7518a238 CM |
287 | } |
288 | ||
bb492bb0 CM |
289 | static inline void btrfs_set_header_parentid(struct btrfs_header *h, |
290 | u64 parentid) | |
7518a238 | 291 | { |
bb492bb0 | 292 | h->parentid = cpu_to_le64(parentid); |
7518a238 CM |
293 | } |
294 | ||
bb492bb0 | 295 | static inline u16 btrfs_header_nritems(struct btrfs_header *h) |
7518a238 | 296 | { |
bb492bb0 | 297 | return le16_to_cpu(h->nritems); |
7518a238 CM |
298 | } |
299 | ||
bb492bb0 | 300 | static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val) |
7518a238 | 301 | { |
bb492bb0 | 302 | h->nritems = cpu_to_le16(val); |
7518a238 CM |
303 | } |
304 | ||
bb492bb0 | 305 | static inline u16 btrfs_header_flags(struct btrfs_header *h) |
7518a238 | 306 | { |
bb492bb0 | 307 | return le16_to_cpu(h->flags); |
7518a238 CM |
308 | } |
309 | ||
bb492bb0 | 310 | static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val) |
7518a238 | 311 | { |
bb492bb0 | 312 | h->flags = cpu_to_le16(val); |
7518a238 CM |
313 | } |
314 | ||
bb492bb0 | 315 | static inline int btrfs_header_level(struct btrfs_header *h) |
7518a238 | 316 | { |
234b63a0 | 317 | return btrfs_header_flags(h) & (BTRFS_MAX_LEVEL - 1); |
7518a238 CM |
318 | } |
319 | ||
bb492bb0 | 320 | static inline void btrfs_set_header_level(struct btrfs_header *h, int level) |
7518a238 | 321 | { |
bb492bb0 | 322 | u16 flags; |
234b63a0 CM |
323 | BUG_ON(level > BTRFS_MAX_LEVEL); |
324 | flags = btrfs_header_flags(h) & ~(BTRFS_MAX_LEVEL - 1); | |
7518a238 CM |
325 | btrfs_set_header_flags(h, flags | level); |
326 | } | |
327 | ||
234b63a0 | 328 | static inline int btrfs_is_leaf(struct btrfs_node *n) |
7518a238 CM |
329 | { |
330 | return (btrfs_header_level(&n->header) == 0); | |
331 | } | |
332 | ||
3768f368 CM |
333 | static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item) |
334 | { | |
335 | return le64_to_cpu(item->blocknr); | |
336 | } | |
337 | ||
338 | static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val) | |
339 | { | |
340 | item->blocknr = cpu_to_le64(val); | |
341 | } | |
342 | ||
343 | static inline u32 btrfs_root_refs(struct btrfs_root_item *item) | |
344 | { | |
345 | return le32_to_cpu(item->refs); | |
346 | } | |
347 | ||
348 | static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val) | |
349 | { | |
350 | item->refs = cpu_to_le32(val); | |
351 | } | |
352 | ||
353 | static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s) | |
354 | { | |
355 | return le64_to_cpu(s->blocknr); | |
356 | } | |
357 | ||
358 | static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val) | |
359 | { | |
360 | s->blocknr = cpu_to_le64(val); | |
361 | } | |
362 | ||
363 | static inline u64 btrfs_super_root(struct btrfs_super_block *s) | |
364 | { | |
365 | return le64_to_cpu(s->root); | |
366 | } | |
367 | ||
368 | static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val) | |
369 | { | |
370 | s->root = cpu_to_le64(val); | |
371 | } | |
372 | ||
373 | static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s) | |
374 | { | |
375 | return le64_to_cpu(s->total_blocks); | |
376 | } | |
377 | ||
378 | static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s, | |
379 | u64 val) | |
380 | { | |
381 | s->total_blocks = cpu_to_le64(val); | |
382 | } | |
383 | ||
384 | static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s) | |
385 | { | |
386 | return le64_to_cpu(s->blocks_used); | |
387 | } | |
388 | ||
389 | static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s, | |
390 | u64 val) | |
391 | { | |
392 | s->blocks_used = cpu_to_le64(val); | |
393 | } | |
394 | ||
123abc88 | 395 | static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s) |
3768f368 | 396 | { |
123abc88 | 397 | return le32_to_cpu(s->blocksize); |
3768f368 CM |
398 | } |
399 | ||
400 | static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s, | |
123abc88 CM |
401 | u32 val) |
402 | { | |
403 | s->blocksize = cpu_to_le32(val); | |
404 | } | |
405 | ||
406 | static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l) | |
3768f368 | 407 | { |
123abc88 | 408 | return (u8 *)l->items; |
3768f368 CM |
409 | } |
410 | ||
4beb1b8b CM |
411 | /* helper function to cast into the data area of the leaf. */ |
412 | #define btrfs_item_ptr(leaf, slot, type) \ | |
123abc88 CM |
413 | ((type *)(btrfs_leaf_data(leaf) + \ |
414 | btrfs_item_offset((leaf)->items + (slot)))) | |
4beb1b8b | 415 | |
234b63a0 CM |
416 | struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_root *root); |
417 | int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf); | |
418 | int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks); | |
419 | int btrfs_search_slot(struct btrfs_root *root, struct btrfs_key *key, | |
420 | struct btrfs_path *p, int ins_len, int cow); | |
421 | void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p); | |
422 | void btrfs_init_path(struct btrfs_path *p); | |
423 | int btrfs_del_item(struct btrfs_root *root, struct btrfs_path *path); | |
424 | int btrfs_insert_item(struct btrfs_root *root, struct btrfs_key *key, | |
e2fa7227 | 425 | void *data, int data_size); |
234b63a0 | 426 | int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); |
123abc88 | 427 | int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf); |
234b63a0 CM |
428 | int btrfs_drop_snapshot(struct btrfs_root *root, struct btrfs_buffer *snap); |
429 | int btrfs_finish_extent_commit(struct btrfs_root *root); | |
3768f368 CM |
430 | int btrfs_del_root(struct btrfs_root *root, struct btrfs_key *key); |
431 | int btrfs_insert_root(struct btrfs_root *root, struct btrfs_key *key, | |
432 | struct btrfs_root_item *item); | |
433 | int btrfs_update_root(struct btrfs_root *root, struct btrfs_key *key, | |
434 | struct btrfs_root_item *item); | |
435 | int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, | |
436 | struct btrfs_root_item *item, struct btrfs_key *key); | |
eb60ceac | 437 | #endif |