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Btrfs: Fix extent_buffer and extent_state leaks
[mirror_ubuntu-hirsute-kernel.git] / fs / btrfs / ctree.h
1 /*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19 #ifndef __BTRFS__
20 #define __BTRFS__
21
22 #include <linux/fs.h>
23 #include <linux/workqueue.h>
24 #include <linux/completion.h>
25 #include <asm/kmap_types.h>
26 #include "bit-radix.h"
27 #include "extent_map.h"
28
29 struct btrfs_trans_handle;
30 struct btrfs_transaction;
31 extern struct kmem_cache *btrfs_trans_handle_cachep;
32 extern struct kmem_cache *btrfs_transaction_cachep;
33 extern struct kmem_cache *btrfs_bit_radix_cachep;
34 extern struct kmem_cache *btrfs_path_cachep;
35
36 #define BTRFS_MAGIC "_B2RfS_M"
37
38 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
39 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
40 #define BTRFS_FS_TREE_OBJECTID 3ULL
41 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
42 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
43
44 /*
45 * we can actually store much bigger names, but lets not confuse the rest
46 * of linux
47 */
48 #define BTRFS_NAME_LEN 255
49
50 /* 32 bytes in various csum fields */
51 #define BTRFS_CSUM_SIZE 32
52 /* four bytes for CRC32 */
53 #define BTRFS_CRC32_SIZE 4
54 #define BTRFS_EMPTY_DIR_SIZE 6
55
56 #define BTRFS_FT_UNKNOWN 0
57 #define BTRFS_FT_REG_FILE 1
58 #define BTRFS_FT_DIR 2
59 #define BTRFS_FT_CHRDEV 3
60 #define BTRFS_FT_BLKDEV 4
61 #define BTRFS_FT_FIFO 5
62 #define BTRFS_FT_SOCK 6
63 #define BTRFS_FT_SYMLINK 7
64 #define BTRFS_FT_MAX 8
65
66 /*
67 * the key defines the order in the tree, and so it also defines (optimal)
68 * block layout. objectid corresonds to the inode number. The flags
69 * tells us things about the object, and is a kind of stream selector.
70 * so for a given inode, keys with flags of 1 might refer to the inode
71 * data, flags of 2 may point to file data in the btree and flags == 3
72 * may point to extents.
73 *
74 * offset is the starting byte offset for this key in the stream.
75 *
76 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
77 * in cpu native order. Otherwise they are identical and their sizes
78 * should be the same (ie both packed)
79 */
80 struct btrfs_disk_key {
81 __le64 objectid;
82 u8 type;
83 __le64 offset;
84 } __attribute__ ((__packed__));
85
86 struct btrfs_key {
87 u64 objectid;
88 u8 type;
89 u64 offset;
90 } __attribute__ ((__packed__));
91
92 #define BTRFS_FSID_SIZE 16
93 /*
94 * every tree block (leaf or node) starts with this header.
95 */
96 struct btrfs_header {
97 u8 csum[BTRFS_CSUM_SIZE];
98 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
99 __le64 blocknr; /* which block this node is supposed to live in */
100 __le64 generation;
101 __le64 owner;
102 __le32 nritems;
103 __le16 flags;
104 u8 level;
105 } __attribute__ ((__packed__));
106
107 #define BTRFS_MAX_LEVEL 8
108 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
109 sizeof(struct btrfs_header)) / \
110 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
111 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
112 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
113 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
114 sizeof(struct btrfs_item) - \
115 sizeof(struct btrfs_file_extent_item))
116
117 /*
118 * the super block basically lists the main trees of the FS
119 * it currently lacks any block count etc etc
120 */
121 struct btrfs_super_block {
122 u8 csum[BTRFS_CSUM_SIZE];
123 /* the first 3 fields must match struct btrfs_header */
124 u8 fsid[16]; /* FS specific uuid */
125 __le64 blocknr; /* this block number */
126 __le64 magic;
127 __le64 generation;
128 __le64 root;
129 __le64 total_blocks;
130 __le64 blocks_used;
131 __le64 root_dir_objectid;
132 __le32 sectorsize;
133 __le32 nodesize;
134 __le32 leafsize;
135 } __attribute__ ((__packed__));
136
137 /*
138 * A leaf is full of items. offset and size tell us where to find
139 * the item in the leaf (relative to the start of the data area)
140 */
141 struct btrfs_item {
142 struct btrfs_disk_key key;
143 __le32 offset;
144 __le32 size;
145 } __attribute__ ((__packed__));
146
147 /*
148 * leaves have an item area and a data area:
149 * [item0, item1....itemN] [free space] [dataN...data1, data0]
150 *
151 * The data is separate from the items to get the keys closer together
152 * during searches.
153 */
154 struct btrfs_leaf {
155 struct btrfs_header header;
156 struct btrfs_item items[];
157 } __attribute__ ((__packed__));
158
159 /*
160 * all non-leaf blocks are nodes, they hold only keys and pointers to
161 * other blocks
162 */
163 struct btrfs_key_ptr {
164 struct btrfs_disk_key key;
165 __le64 blockptr;
166 } __attribute__ ((__packed__));
167
168 struct btrfs_node {
169 struct btrfs_header header;
170 struct btrfs_key_ptr ptrs[];
171 } __attribute__ ((__packed__));
172
173 /*
174 * btrfs_paths remember the path taken from the root down to the leaf.
175 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
176 * to any other levels that are present.
177 *
178 * The slots array records the index of the item or block pointer
179 * used while walking the tree.
180 */
181 struct btrfs_path {
182 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
183 int slots[BTRFS_MAX_LEVEL];
184 int reada;
185 int lowest_level;
186 };
187
188 /*
189 * items in the extent btree are used to record the objectid of the
190 * owner of the block and the number of references
191 */
192 struct btrfs_extent_item {
193 __le32 refs;
194 __le64 owner;
195 } __attribute__ ((__packed__));
196
197 struct btrfs_inode_timespec {
198 __le64 sec;
199 __le32 nsec;
200 } __attribute__ ((__packed__));
201
202 /*
203 * there is no padding here on purpose. If you want to extent the inode,
204 * make a new item type
205 */
206 struct btrfs_inode_item {
207 __le64 generation;
208 __le64 size;
209 __le64 nblocks;
210 __le64 block_group;
211 __le32 nlink;
212 __le32 uid;
213 __le32 gid;
214 __le32 mode;
215 __le32 rdev;
216 __le16 flags;
217 __le16 compat_flags;
218 struct btrfs_inode_timespec atime;
219 struct btrfs_inode_timespec ctime;
220 struct btrfs_inode_timespec mtime;
221 struct btrfs_inode_timespec otime;
222 } __attribute__ ((__packed__));
223
224 struct btrfs_dir_item {
225 struct btrfs_disk_key location;
226 __le16 flags;
227 __le16 name_len;
228 u8 type;
229 } __attribute__ ((__packed__));
230
231 struct btrfs_root_item {
232 struct btrfs_inode_item inode;
233 __le64 root_dirid;
234 __le64 blocknr;
235 __le64 block_limit;
236 __le64 blocks_used;
237 __le32 flags;
238 __le32 refs;
239 struct btrfs_disk_key drop_progress;
240 u8 drop_level;
241 } __attribute__ ((__packed__));
242
243 #define BTRFS_FILE_EXTENT_REG 0
244 #define BTRFS_FILE_EXTENT_INLINE 1
245
246 struct btrfs_file_extent_item {
247 __le64 generation;
248 u8 type;
249 /*
250 * disk space consumed by the extent, checksum blocks are included
251 * in these numbers
252 */
253 __le64 disk_blocknr;
254 __le64 disk_num_blocks;
255 /*
256 * the logical offset in file blocks (no csums)
257 * this extent record is for. This allows a file extent to point
258 * into the middle of an existing extent on disk, sharing it
259 * between two snapshots (useful if some bytes in the middle of the
260 * extent have changed
261 */
262 __le64 offset;
263 /*
264 * the logical number of file blocks (no csums included)
265 */
266 __le64 num_blocks;
267 } __attribute__ ((__packed__));
268
269 struct btrfs_csum_item {
270 u8 csum;
271 } __attribute__ ((__packed__));
272
273 /* tag for the radix tree of block groups in ram */
274 #define BTRFS_BLOCK_GROUP_DIRTY 0
275 #define BTRFS_BLOCK_GROUP_AVAIL 1
276 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
277
278
279 #define BTRFS_BLOCK_GROUP_DATA 1
280 struct btrfs_block_group_item {
281 __le64 used;
282 u8 flags;
283 } __attribute__ ((__packed__));
284
285 struct btrfs_block_group_cache {
286 struct btrfs_key key;
287 struct btrfs_block_group_item item;
288 struct radix_tree_root *radix;
289 u64 first_free;
290 u64 last_alloc;
291 u64 pinned;
292 u64 last_prealloc;
293 int data;
294 int cached;
295 };
296
297 struct btrfs_fs_info {
298 u8 fsid[BTRFS_FSID_SIZE];
299 struct btrfs_root *extent_root;
300 struct btrfs_root *tree_root;
301 struct radix_tree_root fs_roots_radix;
302 struct radix_tree_root pending_del_radix;
303 struct radix_tree_root pinned_radix;
304 struct radix_tree_root block_group_radix;
305 struct radix_tree_root block_group_data_radix;
306 struct radix_tree_root extent_ins_radix;
307 struct extent_map_tree free_space_cache;
308 u64 generation;
309 u64 last_trans_committed;
310 struct btrfs_transaction *running_transaction;
311 struct btrfs_super_block super_copy;
312 struct extent_buffer *sb_buffer;
313 struct super_block *sb;
314 struct inode *btree_inode;
315 struct mutex trans_mutex;
316 struct mutex fs_mutex;
317 struct list_head trans_list;
318 struct list_head dead_roots;
319 struct delayed_work trans_work;
320 struct kobject super_kobj;
321 struct completion kobj_unregister;
322 int do_barriers;
323 int closing;
324 };
325
326 /*
327 * in ram representation of the tree. extent_root is used for all allocations
328 * and for the extent tree extent_root root.
329 */
330 struct btrfs_root {
331 struct extent_buffer *node;
332 struct extent_buffer *commit_root;
333 struct btrfs_root_item root_item;
334 struct btrfs_key root_key;
335 struct btrfs_fs_info *fs_info;
336 struct inode *inode;
337 struct kobject root_kobj;
338 struct completion kobj_unregister;
339 struct rw_semaphore snap_sem;
340 u64 objectid;
341 u64 last_trans;
342
343 /* data allocations are done in sectorsize units */
344 u32 sectorsize;
345
346 /* node allocations are done in nodesize units */
347 u32 nodesize;
348
349 /* leaf allocations are done in leafsize units */
350 u32 leafsize;
351
352 u32 type;
353 u64 highest_inode;
354 u64 last_inode_alloc;
355 int ref_cows;
356 struct btrfs_key defrag_progress;
357 int defrag_running;
358 int defrag_level;
359 char *name;
360 };
361
362 /*
363 * inode items have the data typically returned from stat and store other
364 * info about object characteristics. There is one for every file and dir in
365 * the FS
366 */
367 #define BTRFS_INODE_ITEM_KEY 1
368
369 /* reserve 2-15 close to the inode for later flexibility */
370
371 /*
372 * dir items are the name -> inode pointers in a directory. There is one
373 * for every name in a directory.
374 */
375 #define BTRFS_DIR_ITEM_KEY 16
376 #define BTRFS_DIR_INDEX_KEY 17
377 /*
378 * extent data is for file data
379 */
380 #define BTRFS_EXTENT_DATA_KEY 18
381 /*
382 * csum items have the checksums for data in the extents
383 */
384 #define BTRFS_CSUM_ITEM_KEY 19
385
386 /* reserve 20-31 for other file stuff */
387
388 /*
389 * root items point to tree roots. There are typically in the root
390 * tree used by the super block to find all the other trees
391 */
392 #define BTRFS_ROOT_ITEM_KEY 32
393 /*
394 * extent items are in the extent map tree. These record which blocks
395 * are used, and how many references there are to each block
396 */
397 #define BTRFS_EXTENT_ITEM_KEY 33
398
399 /*
400 * block groups give us hints into the extent allocation trees. Which
401 * blocks are free etc etc
402 */
403 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
404
405 /*
406 * string items are for debugging. They just store a short string of
407 * data in the FS
408 */
409 #define BTRFS_STRING_ITEM_KEY 253
410
411 /* some macros to generate set/get funcs for the struct fields. This
412 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
413 * one for u8:
414 */
415 #define le8_to_cpu(v) (v)
416 #define cpu_to_le8(v) (v)
417 #define __le8 u8
418
419 #define read_eb_member(eb, ptr, type, member, result) ( \
420 read_extent_buffer(eb, (char *)(result), \
421 ((unsigned long)(ptr)) + \
422 offsetof(type, member), \
423 sizeof(((type *)0)->member)))
424
425 #define write_eb_member(eb, ptr, type, member, result) ( \
426 write_extent_buffer(eb, (char *)(result), \
427 ((unsigned long)(ptr)) + \
428 offsetof(type, member), \
429 sizeof(((type *)0)->member)))
430
431 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
432 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
433 type *s) \
434 { \
435 int err; \
436 char *map_token; \
437 char *kaddr; \
438 unsigned long map_start; \
439 unsigned long map_len; \
440 unsigned long offset = (unsigned long)s + \
441 offsetof(type, member); \
442 err = map_extent_buffer(eb, offset, \
443 sizeof(((type *)0)->member), \
444 &map_token, &kaddr, \
445 &map_start, &map_len, KM_USER0); \
446 if (!err) { \
447 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
448 map_start); \
449 u##bits res = le##bits##_to_cpu(*tmp); \
450 unmap_extent_buffer(eb, map_token, KM_USER0); \
451 return res; \
452 } else { \
453 __le##bits res; \
454 read_eb_member(eb, s, type, member, &res); \
455 return le##bits##_to_cpu(res); \
456 } \
457 } \
458 static inline void btrfs_set_##name(struct extent_buffer *eb, \
459 type *s, u##bits val) \
460 { \
461 int err; \
462 char *map_token; \
463 char *kaddr; \
464 unsigned long map_start; \
465 unsigned long map_len; \
466 unsigned long offset = (unsigned long)s + \
467 offsetof(type, member); \
468 err = map_extent_buffer(eb, offset, \
469 sizeof(((type *)0)->member), \
470 &map_token, &kaddr, \
471 &map_start, &map_len, KM_USER0); \
472 if (!err) { \
473 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
474 map_start); \
475 *tmp = cpu_to_le##bits(val); \
476 unmap_extent_buffer(eb, map_token, KM_USER0); \
477 } else { \
478 val = cpu_to_le##bits(val); \
479 write_eb_member(eb, s, type, member, &val); \
480 } \
481 }
482
483 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
484 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
485 { \
486 int err; \
487 char *map_token; \
488 char *kaddr; \
489 unsigned long map_start; \
490 unsigned long map_len; \
491 unsigned long offset = offsetof(type, member); \
492 err = map_extent_buffer(eb, offset, \
493 sizeof(((type *)0)->member), \
494 &map_token, &kaddr, \
495 &map_start, &map_len, KM_USER0); \
496 if (!err) { \
497 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
498 map_start); \
499 u##bits res = le##bits##_to_cpu(*tmp); \
500 unmap_extent_buffer(eb, map_token, KM_USER0); \
501 return res; \
502 } else { \
503 __le##bits res; \
504 read_eb_member(eb, NULL, type, member, &res); \
505 return le##bits##_to_cpu(res); \
506 } \
507 } \
508 static inline void btrfs_set_##name(struct extent_buffer *eb, \
509 u##bits val) \
510 { \
511 int err; \
512 char *map_token; \
513 char *kaddr; \
514 unsigned long map_start; \
515 unsigned long map_len; \
516 unsigned long offset = offsetof(type, member); \
517 err = map_extent_buffer(eb, offset, \
518 sizeof(((type *)0)->member), \
519 &map_token, &kaddr, \
520 &map_start, &map_len, KM_USER0); \
521 if (!err) { \
522 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
523 map_start); \
524 *tmp = cpu_to_le##bits(val); \
525 unmap_extent_buffer(eb, map_token, KM_USER0); \
526 } else { \
527 val = cpu_to_le##bits(val); \
528 write_eb_member(eb, NULL, type, member, &val); \
529 } \
530 }
531
532 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
533 static inline u##bits btrfs_##name(type *s) \
534 { \
535 return le##bits##_to_cpu(s->member); \
536 } \
537 static inline void btrfs_set_##name(type *s, u##bits val) \
538 { \
539 s->member = cpu_to_le##bits(val); \
540 }
541
542 /* struct btrfs_block_group_item */
543 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
544 used, 64);
545 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
546 used, 64);
547
548 /* struct btrfs_inode_item */
549 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
550 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
551 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
552 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
553 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
554 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
555 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
556 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
557 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
558 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
559 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
560 compat_flags, 16);
561
562 static inline struct btrfs_inode_timespec *
563 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
564 {
565 unsigned long ptr = (unsigned long)inode_item;
566 ptr += offsetof(struct btrfs_inode_item, atime);
567 return (struct btrfs_inode_timespec *)ptr;
568 }
569
570 static inline struct btrfs_inode_timespec *
571 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
572 {
573 unsigned long ptr = (unsigned long)inode_item;
574 ptr += offsetof(struct btrfs_inode_item, mtime);
575 return (struct btrfs_inode_timespec *)ptr;
576 }
577
578 static inline struct btrfs_inode_timespec *
579 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
580 {
581 unsigned long ptr = (unsigned long)inode_item;
582 ptr += offsetof(struct btrfs_inode_item, ctime);
583 return (struct btrfs_inode_timespec *)ptr;
584 }
585
586 static inline struct btrfs_inode_timespec *
587 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
588 {
589 unsigned long ptr = (unsigned long)inode_item;
590 ptr += offsetof(struct btrfs_inode_item, otime);
591 return (struct btrfs_inode_timespec *)ptr;
592 }
593
594 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
595 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
596
597 /* struct btrfs_extent_item */
598 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
599 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
600
601 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
602 refs, 32);
603 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
604 owner, 32);
605
606 /* struct btrfs_node */
607 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
608
609 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
610 {
611 unsigned long ptr;
612 ptr = offsetof(struct btrfs_node, ptrs) +
613 sizeof(struct btrfs_key_ptr) * nr;
614 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
615 }
616
617 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
618 int nr, u64 val)
619 {
620 unsigned long ptr;
621 ptr = offsetof(struct btrfs_node, ptrs) +
622 sizeof(struct btrfs_key_ptr) * nr;
623 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
624 }
625
626 static unsigned long btrfs_node_key_ptr_offset(int nr)
627 {
628 return offsetof(struct btrfs_node, ptrs) +
629 sizeof(struct btrfs_key_ptr) * nr;
630 }
631
632 static void btrfs_node_key(struct extent_buffer *eb,
633 struct btrfs_disk_key *disk_key, int nr)
634 {
635 unsigned long ptr;
636 ptr = btrfs_node_key_ptr_offset(nr);
637 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
638 struct btrfs_key_ptr, key, disk_key);
639 }
640 static inline void btrfs_set_node_key(struct extent_buffer *eb,
641 struct btrfs_disk_key *disk_key, int nr)
642 {
643 unsigned long ptr;
644 ptr = btrfs_node_key_ptr_offset(nr);
645 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
646 struct btrfs_key_ptr, key, disk_key);
647 }
648
649 /* struct btrfs_item */
650 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
651 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
652
653 static inline unsigned long btrfs_item_nr_offset(int nr)
654 {
655 return offsetof(struct btrfs_leaf, items) +
656 sizeof(struct btrfs_item) * nr;
657 }
658
659 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
660 int nr)
661 {
662 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
663 }
664
665 static inline u32 btrfs_item_end(struct extent_buffer *eb,
666 struct btrfs_item *item)
667 {
668 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
669 }
670
671 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
672 {
673 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
674 }
675
676 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
677 {
678 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
679 }
680
681 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
682 {
683 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
684 }
685
686 static inline void btrfs_item_key(struct extent_buffer *eb,
687 struct btrfs_disk_key *disk_key, int nr)
688 {
689 struct btrfs_item *item = btrfs_item_nr(eb, nr);
690 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
691 }
692
693 static inline void btrfs_set_item_key(struct extent_buffer *eb,
694 struct btrfs_disk_key *disk_key, int nr)
695 {
696 struct btrfs_item *item = btrfs_item_nr(eb, nr);
697 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
698 }
699
700 /* struct btrfs_dir_item */
701 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
702 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
703 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
704
705 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
706 struct btrfs_dir_item *item,
707 struct btrfs_disk_key *key)
708 {
709 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
710 }
711
712 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
713 struct btrfs_dir_item *item,
714 struct btrfs_disk_key *key)
715 {
716 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
717 }
718
719 /* struct btrfs_disk_key */
720 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
721 objectid, 64);
722 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
723 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
724
725 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
726 struct btrfs_disk_key *disk)
727 {
728 cpu->offset = le64_to_cpu(disk->offset);
729 cpu->type = disk->type;
730 cpu->objectid = le64_to_cpu(disk->objectid);
731 }
732
733 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
734 struct btrfs_key *cpu)
735 {
736 disk->offset = cpu_to_le64(cpu->offset);
737 disk->type = cpu->type;
738 disk->objectid = cpu_to_le64(cpu->objectid);
739 }
740
741 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
742 struct btrfs_key *key, int nr)
743 {
744 struct btrfs_disk_key disk_key;
745 btrfs_node_key(eb, &disk_key, nr);
746 btrfs_disk_key_to_cpu(key, &disk_key);
747 }
748
749 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
750 struct btrfs_key *key, int nr)
751 {
752 struct btrfs_disk_key disk_key;
753 btrfs_item_key(eb, &disk_key, nr);
754 btrfs_disk_key_to_cpu(key, &disk_key);
755 }
756
757 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
758 struct btrfs_dir_item *item,
759 struct btrfs_key *key)
760 {
761 struct btrfs_disk_key disk_key;
762 btrfs_dir_item_key(eb, item, &disk_key);
763 btrfs_disk_key_to_cpu(key, &disk_key);
764 }
765
766
767 static inline u8 btrfs_key_type(struct btrfs_key *key)
768 {
769 return key->type;
770 }
771
772 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
773 {
774 key->type = val;
775 }
776
777 /* struct btrfs_header */
778 BTRFS_SETGET_HEADER_FUNCS(header_blocknr, struct btrfs_header, blocknr, 64);
779 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
780 generation, 64);
781 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
782 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
783 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
784 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
785
786 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
787 {
788 unsigned long ptr = offsetof(struct btrfs_header, fsid);
789 return (u8 *)ptr;
790 }
791
792 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
793 {
794 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
795 return (u8 *)ptr;
796 }
797
798 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
799 {
800 unsigned long ptr = offsetof(struct btrfs_header, csum);
801 return (u8 *)ptr;
802 }
803
804 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
805 {
806 return NULL;
807 }
808
809 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
810 {
811 return NULL;
812 }
813
814 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
815 {
816 return NULL;
817 }
818
819 static inline int btrfs_is_leaf(struct extent_buffer *eb)
820 {
821 return (btrfs_header_level(eb) == 0);
822 }
823
824 /* struct btrfs_root_item */
825 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
826 BTRFS_SETGET_FUNCS(disk_root_blocknr, struct btrfs_root_item, blocknr, 64);
827
828 BTRFS_SETGET_STACK_FUNCS(root_blocknr, struct btrfs_root_item, blocknr, 64);
829 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
830 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
831 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
832 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, blocks_used, 64);
833 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, block_limit, 64);
834
835 /* struct btrfs_super_block */
836 BTRFS_SETGET_STACK_FUNCS(super_blocknr, struct btrfs_super_block, blocknr, 64);
837 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
838 generation, 64);
839 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
840 BTRFS_SETGET_STACK_FUNCS(super_total_blocks, struct btrfs_super_block,
841 total_blocks, 64);
842 BTRFS_SETGET_STACK_FUNCS(super_blocks_used, struct btrfs_super_block,
843 blocks_used, 64);
844 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
845 sectorsize, 32);
846 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
847 nodesize, 32);
848 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
849 leafsize, 32);
850 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
851 root_dir_objectid, 64);
852
853 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
854 {
855 return offsetof(struct btrfs_leaf, items);
856 }
857
858 /* struct btrfs_file_extent_item */
859 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
860
861 static inline unsigned long btrfs_file_extent_inline_start(struct
862 btrfs_file_extent_item *e)
863 {
864 unsigned long offset = (unsigned long)e;
865 offset += offsetof(struct btrfs_file_extent_item, disk_blocknr);
866 return offset;
867 }
868
869 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
870 {
871 return offsetof(struct btrfs_file_extent_item, disk_blocknr) + datasize;
872 }
873
874 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
875 struct btrfs_item *e)
876 {
877 unsigned long offset;
878 offset = offsetof(struct btrfs_file_extent_item, disk_blocknr);
879 return btrfs_item_size(eb, e) - offset;
880 }
881
882 BTRFS_SETGET_FUNCS(file_extent_disk_blocknr, struct btrfs_file_extent_item,
883 disk_blocknr, 64);
884 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
885 generation, 64);
886 BTRFS_SETGET_FUNCS(file_extent_disk_num_blocks, struct btrfs_file_extent_item,
887 disk_num_blocks, 64);
888 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
889 offset, 64);
890 BTRFS_SETGET_FUNCS(file_extent_num_blocks, struct btrfs_file_extent_item,
891 num_blocks, 64);
892
893 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
894 {
895 return sb->s_fs_info;
896 }
897
898 static inline int btrfs_set_root_name(struct btrfs_root *root,
899 const char *name, int len)
900 {
901 /* if we already have a name just free it */
902 if (root->name)
903 kfree(root->name);
904
905 root->name = kmalloc(len+1, GFP_KERNEL);
906 if (!root->name)
907 return -ENOMEM;
908
909 memcpy(root->name, name, len);
910 root->name[len] ='\0';
911
912 return 0;
913 }
914
915 /* helper function to cast into the data area of the leaf. */
916 #define btrfs_item_ptr(leaf, slot, type) \
917 ((type *)(btrfs_leaf_data(leaf) + \
918 btrfs_item_offset_nr(leaf, slot)))
919
920 #define btrfs_item_ptr_offset(leaf, slot) \
921 ((unsigned long)(btrfs_leaf_data(leaf) + \
922 btrfs_item_offset_nr(leaf, slot)))
923
924 /* mount option defines and helpers */
925 #define BTRFS_MOUNT_SUBVOL 0x000001
926 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
927 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
928 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
929 BTRFS_MOUNT_##opt)
930 /* extent-tree.c */
931 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
932 struct btrfs_root *root);
933 int btrfs_copy_pinned(struct btrfs_root *root, struct radix_tree_root *copy);
934 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
935 btrfs_fs_info *info,
936 u64 blocknr);
937 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
938 struct btrfs_block_group_cache
939 *hint, u64 search_start,
940 int data, int owner);
941 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
942 struct btrfs_root *root);
943 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
944 struct btrfs_root *root, u64 hint,
945 u64 empty_size);
946 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
947 struct btrfs_root *root, u64 owner,
948 u64 num_blocks, u64 empty_size, u64 search_start,
949 u64 search_end, struct btrfs_key *ins, int data);
950 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
951 struct extent_buffer *buf);
952 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
953 *root, u64 blocknr, u64 num_blocks, int pin);
954 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
955 struct btrfs_root *root,
956 struct radix_tree_root *unpin_radix);
957 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
958 struct btrfs_root *root,
959 u64 blocknr, u64 num_blocks);
960 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
961 struct btrfs_root *root);
962 int btrfs_free_block_groups(struct btrfs_fs_info *info);
963 int btrfs_read_block_groups(struct btrfs_root *root);
964 /* ctree.c */
965 int btrfs_cow_block(struct btrfs_trans_handle *trans,
966 struct btrfs_root *root, struct extent_buffer *buf,
967 struct extent_buffer *parent, int parent_slot,
968 struct extent_buffer **cow_ret);
969 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
970 *root, struct btrfs_path *path, u32 data_size);
971 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
972 struct btrfs_root *root,
973 struct btrfs_path *path,
974 u32 new_size);
975 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
976 *root, struct btrfs_key *key, struct btrfs_path *p, int
977 ins_len, int cow);
978 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
979 struct btrfs_root *root, struct extent_buffer *parent,
980 int cache_only, u64 *last_ret);
981 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
982 struct btrfs_path *btrfs_alloc_path(void);
983 void btrfs_free_path(struct btrfs_path *p);
984 void btrfs_init_path(struct btrfs_path *p);
985 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
986 struct btrfs_path *path);
987 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
988 *root, struct btrfs_key *key, void *data, u32 data_size);
989 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
990 *root, struct btrfs_path *path, struct btrfs_key
991 *cpu_key, u32 data_size);
992 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
993 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
994 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
995 *root);
996 /* root-item.c */
997 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
998 struct btrfs_key *key);
999 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1000 *root, struct btrfs_key *key, struct btrfs_root_item
1001 *item);
1002 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1003 *root, struct btrfs_key *key, struct btrfs_root_item
1004 *item);
1005 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1006 btrfs_root_item *item, struct btrfs_key *key);
1007 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1008 struct btrfs_root *latest_root);
1009 /* dir-item.c */
1010 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1011 *root, const char *name, int name_len, u64 dir,
1012 struct btrfs_key *location, u8 type);
1013 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1014 struct btrfs_root *root,
1015 struct btrfs_path *path, u64 dir,
1016 const char *name, int name_len,
1017 int mod);
1018 struct btrfs_dir_item *
1019 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1020 struct btrfs_root *root,
1021 struct btrfs_path *path, u64 dir,
1022 u64 objectid, const char *name, int name_len,
1023 int mod);
1024 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1025 struct btrfs_path *path,
1026 const char *name, int name_len);
1027 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1028 struct btrfs_root *root,
1029 struct btrfs_path *path,
1030 struct btrfs_dir_item *di);
1031 /* inode-map.c */
1032 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1033 struct btrfs_root *fs_root,
1034 u64 dirid, u64 *objectid);
1035 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1036
1037 /* inode-item.c */
1038 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1039 struct btrfs_root *root,
1040 struct btrfs_path *path, u64 objectid);
1041 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1042 *root, struct btrfs_path *path,
1043 struct btrfs_key *location, int mod);
1044
1045 /* file-item.c */
1046 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1047 struct btrfs_root *root,
1048 u64 objectid, u64 pos, u64 offset,
1049 u64 disk_num_blocks,
1050 u64 num_blocks);
1051 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1052 struct btrfs_root *root,
1053 struct btrfs_path *path, u64 objectid,
1054 u64 blocknr, int mod);
1055 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1056 struct btrfs_root *root,
1057 u64 objectid, u64 offset,
1058 char *data, size_t len);
1059 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1060 struct btrfs_root *root,
1061 struct btrfs_path *path,
1062 u64 objectid, u64 offset,
1063 int cow);
1064 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1065 struct btrfs_root *root, struct btrfs_path *path,
1066 u64 isize);
1067 /* inode.c */
1068 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1069 int btrfs_readpage(struct file *file, struct page *page);
1070 void btrfs_delete_inode(struct inode *inode);
1071 void btrfs_read_locked_inode(struct inode *inode);
1072 int btrfs_write_inode(struct inode *inode, int wait);
1073 void btrfs_dirty_inode(struct inode *inode);
1074 struct inode *btrfs_alloc_inode(struct super_block *sb);
1075 void btrfs_destroy_inode(struct inode *inode);
1076 int btrfs_init_cachep(void);
1077 void btrfs_destroy_cachep(void);
1078 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1079 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1080 struct btrfs_root *root);
1081 int btrfs_commit_write(struct file *file, struct page *page,
1082 unsigned from, unsigned to);
1083 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1084 size_t page_offset, u64 start, u64 end,
1085 int create);
1086 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1087 struct btrfs_root *root,
1088 struct inode *inode);
1089 /* file.c */
1090 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1091 extern struct file_operations btrfs_file_operations;
1092 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1093 struct btrfs_root *root, struct inode *inode,
1094 u64 start, u64 end, u64 *hint_block);
1095 /* tree-defrag.c */
1096 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1097 struct btrfs_root *root, int cache_only);
1098
1099 /* sysfs.c */
1100 int btrfs_init_sysfs(void);
1101 void btrfs_exit_sysfs(void);
1102 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1103 int btrfs_sysfs_add_root(struct btrfs_root *root);
1104 void btrfs_sysfs_del_root(struct btrfs_root *root);
1105 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1106
1107 #endif
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