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Btrfs: Stop using radix trees for the block group cache
[deliverable/linux.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_SIZE (256 * 1024 * 1024)
275
276
277 #define BTRFS_BLOCK_GROUP_DATA 1
278 struct btrfs_block_group_item {
279 __le64 used;
280 u8 flags;
281 } __attribute__ ((__packed__));
282
283 struct btrfs_block_group_cache {
284 struct btrfs_key key;
285 struct btrfs_block_group_item item;
286 u64 first_free;
287 u64 last_alloc;
288 u64 pinned;
289 u64 last_prealloc;
290 int data;
291 int cached;
292 };
293
294 struct btrfs_fs_info {
295 u8 fsid[BTRFS_FSID_SIZE];
296 struct btrfs_root *extent_root;
297 struct btrfs_root *tree_root;
298 struct radix_tree_root fs_roots_radix;
299 struct radix_tree_root pending_del_radix;
300 struct radix_tree_root pinned_radix;
301 struct radix_tree_root extent_ins_radix;
302 struct extent_map_tree free_space_cache;
303 struct extent_map_tree block_group_cache;
304 u64 generation;
305 u64 last_trans_committed;
306 struct btrfs_transaction *running_transaction;
307 struct btrfs_super_block super_copy;
308 struct extent_buffer *sb_buffer;
309 struct super_block *sb;
310 struct inode *btree_inode;
311 struct mutex trans_mutex;
312 struct mutex fs_mutex;
313 struct list_head trans_list;
314 struct list_head dead_roots;
315 struct delayed_work trans_work;
316 struct kobject super_kobj;
317 struct completion kobj_unregister;
318 int do_barriers;
319 int closing;
320 };
321
322 /*
323 * in ram representation of the tree. extent_root is used for all allocations
324 * and for the extent tree extent_root root.
325 */
326 struct btrfs_root {
327 struct extent_buffer *node;
328 struct extent_buffer *commit_root;
329 struct btrfs_root_item root_item;
330 struct btrfs_key root_key;
331 struct btrfs_fs_info *fs_info;
332 struct inode *inode;
333 struct kobject root_kobj;
334 struct completion kobj_unregister;
335 struct rw_semaphore snap_sem;
336 u64 objectid;
337 u64 last_trans;
338
339 /* data allocations are done in sectorsize units */
340 u32 sectorsize;
341
342 /* node allocations are done in nodesize units */
343 u32 nodesize;
344
345 /* leaf allocations are done in leafsize units */
346 u32 leafsize;
347
348 u32 type;
349 u64 highest_inode;
350 u64 last_inode_alloc;
351 int ref_cows;
352 struct btrfs_key defrag_progress;
353 int defrag_running;
354 int defrag_level;
355 char *name;
356 };
357
358 /*
359 * inode items have the data typically returned from stat and store other
360 * info about object characteristics. There is one for every file and dir in
361 * the FS
362 */
363 #define BTRFS_INODE_ITEM_KEY 1
364
365 /* reserve 2-15 close to the inode for later flexibility */
366
367 /*
368 * dir items are the name -> inode pointers in a directory. There is one
369 * for every name in a directory.
370 */
371 #define BTRFS_DIR_ITEM_KEY 16
372 #define BTRFS_DIR_INDEX_KEY 17
373 /*
374 * extent data is for file data
375 */
376 #define BTRFS_EXTENT_DATA_KEY 18
377 /*
378 * csum items have the checksums for data in the extents
379 */
380 #define BTRFS_CSUM_ITEM_KEY 19
381
382 /* reserve 20-31 for other file stuff */
383
384 /*
385 * root items point to tree roots. There are typically in the root
386 * tree used by the super block to find all the other trees
387 */
388 #define BTRFS_ROOT_ITEM_KEY 32
389 /*
390 * extent items are in the extent map tree. These record which blocks
391 * are used, and how many references there are to each block
392 */
393 #define BTRFS_EXTENT_ITEM_KEY 33
394
395 /*
396 * block groups give us hints into the extent allocation trees. Which
397 * blocks are free etc etc
398 */
399 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
400
401 /*
402 * string items are for debugging. They just store a short string of
403 * data in the FS
404 */
405 #define BTRFS_STRING_ITEM_KEY 253
406
407 /* some macros to generate set/get funcs for the struct fields. This
408 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
409 * one for u8:
410 */
411 #define le8_to_cpu(v) (v)
412 #define cpu_to_le8(v) (v)
413 #define __le8 u8
414
415 #define read_eb_member(eb, ptr, type, member, result) ( \
416 read_extent_buffer(eb, (char *)(result), \
417 ((unsigned long)(ptr)) + \
418 offsetof(type, member), \
419 sizeof(((type *)0)->member)))
420
421 #define write_eb_member(eb, ptr, type, member, result) ( \
422 write_extent_buffer(eb, (char *)(result), \
423 ((unsigned long)(ptr)) + \
424 offsetof(type, member), \
425 sizeof(((type *)0)->member)))
426
427 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
428 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
429 type *s) \
430 { \
431 int err; \
432 char *map_token; \
433 char *kaddr; \
434 unsigned long map_start; \
435 unsigned long map_len; \
436 unsigned long offset = (unsigned long)s + \
437 offsetof(type, member); \
438 err = map_extent_buffer(eb, offset, \
439 sizeof(((type *)0)->member), \
440 &map_token, &kaddr, \
441 &map_start, &map_len, KM_USER0); \
442 if (!err) { \
443 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
444 map_start); \
445 u##bits res = le##bits##_to_cpu(*tmp); \
446 unmap_extent_buffer(eb, map_token, KM_USER0); \
447 return res; \
448 } else { \
449 __le##bits res; \
450 read_eb_member(eb, s, type, member, &res); \
451 return le##bits##_to_cpu(res); \
452 } \
453 } \
454 static inline void btrfs_set_##name(struct extent_buffer *eb, \
455 type *s, u##bits val) \
456 { \
457 int err; \
458 char *map_token; \
459 char *kaddr; \
460 unsigned long map_start; \
461 unsigned long map_len; \
462 unsigned long offset = (unsigned long)s + \
463 offsetof(type, member); \
464 err = map_extent_buffer(eb, offset, \
465 sizeof(((type *)0)->member), \
466 &map_token, &kaddr, \
467 &map_start, &map_len, KM_USER0); \
468 if (!err) { \
469 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
470 map_start); \
471 *tmp = cpu_to_le##bits(val); \
472 unmap_extent_buffer(eb, map_token, KM_USER0); \
473 } else { \
474 val = cpu_to_le##bits(val); \
475 write_eb_member(eb, s, type, member, &val); \
476 } \
477 }
478
479 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
480 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
481 { \
482 int err; \
483 char *map_token; \
484 char *kaddr; \
485 unsigned long map_start; \
486 unsigned long map_len; \
487 unsigned long offset = offsetof(type, member); \
488 err = map_extent_buffer(eb, offset, \
489 sizeof(((type *)0)->member), \
490 &map_token, &kaddr, \
491 &map_start, &map_len, KM_USER0); \
492 if (!err) { \
493 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
494 map_start); \
495 u##bits res = le##bits##_to_cpu(*tmp); \
496 unmap_extent_buffer(eb, map_token, KM_USER0); \
497 return res; \
498 } else { \
499 __le##bits res; \
500 read_eb_member(eb, NULL, type, member, &res); \
501 return le##bits##_to_cpu(res); \
502 } \
503 } \
504 static inline void btrfs_set_##name(struct extent_buffer *eb, \
505 u##bits val) \
506 { \
507 int err; \
508 char *map_token; \
509 char *kaddr; \
510 unsigned long map_start; \
511 unsigned long map_len; \
512 unsigned long offset = offsetof(type, member); \
513 err = map_extent_buffer(eb, offset, \
514 sizeof(((type *)0)->member), \
515 &map_token, &kaddr, \
516 &map_start, &map_len, KM_USER0); \
517 if (!err) { \
518 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
519 map_start); \
520 *tmp = cpu_to_le##bits(val); \
521 unmap_extent_buffer(eb, map_token, KM_USER0); \
522 } else { \
523 val = cpu_to_le##bits(val); \
524 write_eb_member(eb, NULL, type, member, &val); \
525 } \
526 }
527
528 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
529 static inline u##bits btrfs_##name(type *s) \
530 { \
531 return le##bits##_to_cpu(s->member); \
532 } \
533 static inline void btrfs_set_##name(type *s, u##bits val) \
534 { \
535 s->member = cpu_to_le##bits(val); \
536 }
537
538 /* struct btrfs_block_group_item */
539 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
540 used, 64);
541 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
542 used, 64);
543
544 /* struct btrfs_inode_item */
545 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
546 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
547 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
548 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
549 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
550 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
551 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
552 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
553 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
554 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
555 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
556 compat_flags, 16);
557
558 static inline struct btrfs_inode_timespec *
559 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
560 {
561 unsigned long ptr = (unsigned long)inode_item;
562 ptr += offsetof(struct btrfs_inode_item, atime);
563 return (struct btrfs_inode_timespec *)ptr;
564 }
565
566 static inline struct btrfs_inode_timespec *
567 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
568 {
569 unsigned long ptr = (unsigned long)inode_item;
570 ptr += offsetof(struct btrfs_inode_item, mtime);
571 return (struct btrfs_inode_timespec *)ptr;
572 }
573
574 static inline struct btrfs_inode_timespec *
575 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
576 {
577 unsigned long ptr = (unsigned long)inode_item;
578 ptr += offsetof(struct btrfs_inode_item, ctime);
579 return (struct btrfs_inode_timespec *)ptr;
580 }
581
582 static inline struct btrfs_inode_timespec *
583 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
584 {
585 unsigned long ptr = (unsigned long)inode_item;
586 ptr += offsetof(struct btrfs_inode_item, otime);
587 return (struct btrfs_inode_timespec *)ptr;
588 }
589
590 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
591 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
592
593 /* struct btrfs_extent_item */
594 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
595 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
596
597 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
598 refs, 32);
599 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
600 owner, 32);
601
602 /* struct btrfs_node */
603 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
604
605 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
606 {
607 unsigned long ptr;
608 ptr = offsetof(struct btrfs_node, ptrs) +
609 sizeof(struct btrfs_key_ptr) * nr;
610 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
611 }
612
613 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
614 int nr, u64 val)
615 {
616 unsigned long ptr;
617 ptr = offsetof(struct btrfs_node, ptrs) +
618 sizeof(struct btrfs_key_ptr) * nr;
619 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
620 }
621
622 static unsigned long btrfs_node_key_ptr_offset(int nr)
623 {
624 return offsetof(struct btrfs_node, ptrs) +
625 sizeof(struct btrfs_key_ptr) * nr;
626 }
627
628 static void btrfs_node_key(struct extent_buffer *eb,
629 struct btrfs_disk_key *disk_key, int nr)
630 {
631 unsigned long ptr;
632 ptr = btrfs_node_key_ptr_offset(nr);
633 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
634 struct btrfs_key_ptr, key, disk_key);
635 }
636 static inline void btrfs_set_node_key(struct extent_buffer *eb,
637 struct btrfs_disk_key *disk_key, int nr)
638 {
639 unsigned long ptr;
640 ptr = btrfs_node_key_ptr_offset(nr);
641 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
642 struct btrfs_key_ptr, key, disk_key);
643 }
644
645 /* struct btrfs_item */
646 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
647 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
648
649 static inline unsigned long btrfs_item_nr_offset(int nr)
650 {
651 return offsetof(struct btrfs_leaf, items) +
652 sizeof(struct btrfs_item) * nr;
653 }
654
655 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
656 int nr)
657 {
658 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
659 }
660
661 static inline u32 btrfs_item_end(struct extent_buffer *eb,
662 struct btrfs_item *item)
663 {
664 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
665 }
666
667 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
668 {
669 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
670 }
671
672 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
673 {
674 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
675 }
676
677 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
678 {
679 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
680 }
681
682 static inline void btrfs_item_key(struct extent_buffer *eb,
683 struct btrfs_disk_key *disk_key, int nr)
684 {
685 struct btrfs_item *item = btrfs_item_nr(eb, nr);
686 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
687 }
688
689 static inline void btrfs_set_item_key(struct extent_buffer *eb,
690 struct btrfs_disk_key *disk_key, int nr)
691 {
692 struct btrfs_item *item = btrfs_item_nr(eb, nr);
693 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
694 }
695
696 /* struct btrfs_dir_item */
697 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
698 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
699 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
700
701 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
702 struct btrfs_dir_item *item,
703 struct btrfs_disk_key *key)
704 {
705 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
706 }
707
708 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
709 struct btrfs_dir_item *item,
710 struct btrfs_disk_key *key)
711 {
712 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
713 }
714
715 /* struct btrfs_disk_key */
716 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
717 objectid, 64);
718 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
719 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
720
721 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
722 struct btrfs_disk_key *disk)
723 {
724 cpu->offset = le64_to_cpu(disk->offset);
725 cpu->type = disk->type;
726 cpu->objectid = le64_to_cpu(disk->objectid);
727 }
728
729 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
730 struct btrfs_key *cpu)
731 {
732 disk->offset = cpu_to_le64(cpu->offset);
733 disk->type = cpu->type;
734 disk->objectid = cpu_to_le64(cpu->objectid);
735 }
736
737 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
738 struct btrfs_key *key, int nr)
739 {
740 struct btrfs_disk_key disk_key;
741 btrfs_node_key(eb, &disk_key, nr);
742 btrfs_disk_key_to_cpu(key, &disk_key);
743 }
744
745 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
746 struct btrfs_key *key, int nr)
747 {
748 struct btrfs_disk_key disk_key;
749 btrfs_item_key(eb, &disk_key, nr);
750 btrfs_disk_key_to_cpu(key, &disk_key);
751 }
752
753 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
754 struct btrfs_dir_item *item,
755 struct btrfs_key *key)
756 {
757 struct btrfs_disk_key disk_key;
758 btrfs_dir_item_key(eb, item, &disk_key);
759 btrfs_disk_key_to_cpu(key, &disk_key);
760 }
761
762
763 static inline u8 btrfs_key_type(struct btrfs_key *key)
764 {
765 return key->type;
766 }
767
768 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
769 {
770 key->type = val;
771 }
772
773 /* struct btrfs_header */
774 BTRFS_SETGET_HEADER_FUNCS(header_blocknr, struct btrfs_header, blocknr, 64);
775 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
776 generation, 64);
777 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
778 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
779 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
780 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
781
782 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
783 {
784 unsigned long ptr = offsetof(struct btrfs_header, fsid);
785 return (u8 *)ptr;
786 }
787
788 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
789 {
790 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
791 return (u8 *)ptr;
792 }
793
794 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
795 {
796 unsigned long ptr = offsetof(struct btrfs_header, csum);
797 return (u8 *)ptr;
798 }
799
800 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
801 {
802 return NULL;
803 }
804
805 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
806 {
807 return NULL;
808 }
809
810 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
811 {
812 return NULL;
813 }
814
815 static inline int btrfs_is_leaf(struct extent_buffer *eb)
816 {
817 return (btrfs_header_level(eb) == 0);
818 }
819
820 /* struct btrfs_root_item */
821 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
822 BTRFS_SETGET_FUNCS(disk_root_blocknr, struct btrfs_root_item, blocknr, 64);
823
824 BTRFS_SETGET_STACK_FUNCS(root_blocknr, struct btrfs_root_item, blocknr, 64);
825 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
826 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
827 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
828 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, blocks_used, 64);
829 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, block_limit, 64);
830
831 /* struct btrfs_super_block */
832 BTRFS_SETGET_STACK_FUNCS(super_blocknr, struct btrfs_super_block, blocknr, 64);
833 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
834 generation, 64);
835 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
836 BTRFS_SETGET_STACK_FUNCS(super_total_blocks, struct btrfs_super_block,
837 total_blocks, 64);
838 BTRFS_SETGET_STACK_FUNCS(super_blocks_used, struct btrfs_super_block,
839 blocks_used, 64);
840 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
841 sectorsize, 32);
842 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
843 nodesize, 32);
844 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
845 leafsize, 32);
846 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
847 root_dir_objectid, 64);
848
849 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
850 {
851 return offsetof(struct btrfs_leaf, items);
852 }
853
854 /* struct btrfs_file_extent_item */
855 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
856
857 static inline unsigned long btrfs_file_extent_inline_start(struct
858 btrfs_file_extent_item *e)
859 {
860 unsigned long offset = (unsigned long)e;
861 offset += offsetof(struct btrfs_file_extent_item, disk_blocknr);
862 return offset;
863 }
864
865 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
866 {
867 return offsetof(struct btrfs_file_extent_item, disk_blocknr) + datasize;
868 }
869
870 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
871 struct btrfs_item *e)
872 {
873 unsigned long offset;
874 offset = offsetof(struct btrfs_file_extent_item, disk_blocknr);
875 return btrfs_item_size(eb, e) - offset;
876 }
877
878 BTRFS_SETGET_FUNCS(file_extent_disk_blocknr, struct btrfs_file_extent_item,
879 disk_blocknr, 64);
880 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
881 generation, 64);
882 BTRFS_SETGET_FUNCS(file_extent_disk_num_blocks, struct btrfs_file_extent_item,
883 disk_num_blocks, 64);
884 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
885 offset, 64);
886 BTRFS_SETGET_FUNCS(file_extent_num_blocks, struct btrfs_file_extent_item,
887 num_blocks, 64);
888
889 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
890 {
891 return sb->s_fs_info;
892 }
893
894 static inline int btrfs_set_root_name(struct btrfs_root *root,
895 const char *name, int len)
896 {
897 /* if we already have a name just free it */
898 if (root->name)
899 kfree(root->name);
900
901 root->name = kmalloc(len+1, GFP_KERNEL);
902 if (!root->name)
903 return -ENOMEM;
904
905 memcpy(root->name, name, len);
906 root->name[len] ='\0';
907
908 return 0;
909 }
910
911 /* helper function to cast into the data area of the leaf. */
912 #define btrfs_item_ptr(leaf, slot, type) \
913 ((type *)(btrfs_leaf_data(leaf) + \
914 btrfs_item_offset_nr(leaf, slot)))
915
916 #define btrfs_item_ptr_offset(leaf, slot) \
917 ((unsigned long)(btrfs_leaf_data(leaf) + \
918 btrfs_item_offset_nr(leaf, slot)))
919
920 /* mount option defines and helpers */
921 #define BTRFS_MOUNT_SUBVOL 0x000001
922 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
923 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
924 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
925 BTRFS_MOUNT_##opt)
926 /* extent-tree.c */
927 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
928 struct btrfs_root *root);
929 int btrfs_copy_pinned(struct btrfs_root *root, struct radix_tree_root *copy);
930 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
931 btrfs_fs_info *info,
932 u64 blocknr);
933 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
934 struct btrfs_block_group_cache
935 *hint, u64 search_start,
936 int data, int owner);
937 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
938 struct btrfs_root *root);
939 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
940 struct btrfs_root *root, u64 hint,
941 u64 empty_size);
942 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
943 struct btrfs_root *root, u64 owner,
944 u64 num_blocks, u64 empty_size, u64 search_start,
945 u64 search_end, struct btrfs_key *ins, int data);
946 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
947 struct extent_buffer *buf);
948 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
949 *root, u64 blocknr, u64 num_blocks, int pin);
950 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
951 struct btrfs_root *root,
952 struct radix_tree_root *unpin_radix);
953 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
954 struct btrfs_root *root,
955 u64 blocknr, u64 num_blocks);
956 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
957 struct btrfs_root *root);
958 int btrfs_free_block_groups(struct btrfs_fs_info *info);
959 int btrfs_read_block_groups(struct btrfs_root *root);
960 /* ctree.c */
961 int btrfs_cow_block(struct btrfs_trans_handle *trans,
962 struct btrfs_root *root, struct extent_buffer *buf,
963 struct extent_buffer *parent, int parent_slot,
964 struct extent_buffer **cow_ret);
965 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
966 *root, struct btrfs_path *path, u32 data_size);
967 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
968 struct btrfs_root *root,
969 struct btrfs_path *path,
970 u32 new_size);
971 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
972 *root, struct btrfs_key *key, struct btrfs_path *p, int
973 ins_len, int cow);
974 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
975 struct btrfs_root *root, struct extent_buffer *parent,
976 int cache_only, u64 *last_ret);
977 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
978 struct btrfs_path *btrfs_alloc_path(void);
979 void btrfs_free_path(struct btrfs_path *p);
980 void btrfs_init_path(struct btrfs_path *p);
981 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
982 struct btrfs_path *path);
983 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
984 *root, struct btrfs_key *key, void *data, u32 data_size);
985 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
986 *root, struct btrfs_path *path, struct btrfs_key
987 *cpu_key, u32 data_size);
988 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
989 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
990 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
991 *root);
992 /* root-item.c */
993 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
994 struct btrfs_key *key);
995 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
996 *root, struct btrfs_key *key, struct btrfs_root_item
997 *item);
998 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
999 *root, struct btrfs_key *key, struct btrfs_root_item
1000 *item);
1001 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1002 btrfs_root_item *item, struct btrfs_key *key);
1003 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1004 struct btrfs_root *latest_root);
1005 /* dir-item.c */
1006 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1007 *root, const char *name, int name_len, u64 dir,
1008 struct btrfs_key *location, u8 type);
1009 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1010 struct btrfs_root *root,
1011 struct btrfs_path *path, u64 dir,
1012 const char *name, int name_len,
1013 int mod);
1014 struct btrfs_dir_item *
1015 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1016 struct btrfs_root *root,
1017 struct btrfs_path *path, u64 dir,
1018 u64 objectid, const char *name, int name_len,
1019 int mod);
1020 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1021 struct btrfs_path *path,
1022 const char *name, int name_len);
1023 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1024 struct btrfs_root *root,
1025 struct btrfs_path *path,
1026 struct btrfs_dir_item *di);
1027 /* inode-map.c */
1028 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1029 struct btrfs_root *fs_root,
1030 u64 dirid, u64 *objectid);
1031 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1032
1033 /* inode-item.c */
1034 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1035 struct btrfs_root *root,
1036 struct btrfs_path *path, u64 objectid);
1037 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1038 *root, struct btrfs_path *path,
1039 struct btrfs_key *location, int mod);
1040
1041 /* file-item.c */
1042 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1043 struct btrfs_root *root,
1044 u64 objectid, u64 pos, u64 offset,
1045 u64 disk_num_blocks,
1046 u64 num_blocks);
1047 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1048 struct btrfs_root *root,
1049 struct btrfs_path *path, u64 objectid,
1050 u64 blocknr, int mod);
1051 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1052 struct btrfs_root *root,
1053 u64 objectid, u64 offset,
1054 char *data, size_t len);
1055 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1056 struct btrfs_root *root,
1057 struct btrfs_path *path,
1058 u64 objectid, u64 offset,
1059 int cow);
1060 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1061 struct btrfs_root *root, struct btrfs_path *path,
1062 u64 isize);
1063 /* inode.c */
1064 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1065 int btrfs_readpage(struct file *file, struct page *page);
1066 void btrfs_delete_inode(struct inode *inode);
1067 void btrfs_read_locked_inode(struct inode *inode);
1068 int btrfs_write_inode(struct inode *inode, int wait);
1069 void btrfs_dirty_inode(struct inode *inode);
1070 struct inode *btrfs_alloc_inode(struct super_block *sb);
1071 void btrfs_destroy_inode(struct inode *inode);
1072 int btrfs_init_cachep(void);
1073 void btrfs_destroy_cachep(void);
1074 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1075 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1076 struct btrfs_root *root);
1077 int btrfs_commit_write(struct file *file, struct page *page,
1078 unsigned from, unsigned to);
1079 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1080 size_t page_offset, u64 start, u64 end,
1081 int create);
1082 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1083 struct btrfs_root *root,
1084 struct inode *inode);
1085 /* file.c */
1086 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1087 extern struct file_operations btrfs_file_operations;
1088 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1089 struct btrfs_root *root, struct inode *inode,
1090 u64 start, u64 end, u64 *hint_block);
1091 /* tree-defrag.c */
1092 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1093 struct btrfs_root *root, int cache_only);
1094
1095 /* sysfs.c */
1096 int btrfs_init_sysfs(void);
1097 void btrfs_exit_sysfs(void);
1098 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1099 int btrfs_sysfs_add_root(struct btrfs_root *root);
1100 void btrfs_sysfs_del_root(struct btrfs_root *root);
1101 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1102
1103 #endif
Linux kernel - Deliverables
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