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Btrfs: Optimizations for the extent_buffer code
[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_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_map_radix;
307 struct radix_tree_root extent_ins_radix;
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 __le##bits res; \
487 read_eb_member(eb, NULL, type, member, &res); \
488 return le##bits##_to_cpu(res); \
489 } \
490 static inline void btrfs_set_##name(struct extent_buffer *eb, \
491 u##bits val) \
492 { \
493 val = cpu_to_le##bits(val); \
494 write_eb_member(eb, NULL, type, member, &val); \
495 }
496
497 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
498 static inline u##bits btrfs_##name(type *s) \
499 { \
500 return le##bits##_to_cpu(s->member); \
501 } \
502 static inline void btrfs_set_##name(type *s, u##bits val) \
503 { \
504 s->member = cpu_to_le##bits(val); \
505 }
506
507 /* struct btrfs_block_group_item */
508 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
509 used, 64);
510 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
511 used, 64);
512
513 /* struct btrfs_inode_item */
514 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
515 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
516 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
517 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
518 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
519 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
520 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
521 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
522 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
523 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
524 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
525 compat_flags, 16);
526
527 static inline struct btrfs_inode_timespec *
528 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
529 {
530 unsigned long ptr = (unsigned long)inode_item;
531 ptr += offsetof(struct btrfs_inode_item, atime);
532 return (struct btrfs_inode_timespec *)ptr;
533 }
534
535 static inline struct btrfs_inode_timespec *
536 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
537 {
538 unsigned long ptr = (unsigned long)inode_item;
539 ptr += offsetof(struct btrfs_inode_item, mtime);
540 return (struct btrfs_inode_timespec *)ptr;
541 }
542
543 static inline struct btrfs_inode_timespec *
544 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
545 {
546 unsigned long ptr = (unsigned long)inode_item;
547 ptr += offsetof(struct btrfs_inode_item, ctime);
548 return (struct btrfs_inode_timespec *)ptr;
549 }
550
551 static inline struct btrfs_inode_timespec *
552 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
553 {
554 unsigned long ptr = (unsigned long)inode_item;
555 ptr += offsetof(struct btrfs_inode_item, otime);
556 return (struct btrfs_inode_timespec *)ptr;
557 }
558
559 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
560 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
561
562 /* struct btrfs_extent_item */
563 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
564 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
565
566 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
567 refs, 32);
568 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
569 owner, 32);
570
571 /* struct btrfs_node */
572 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
573
574 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
575 {
576 unsigned long ptr;
577 ptr = offsetof(struct btrfs_node, ptrs) +
578 sizeof(struct btrfs_key_ptr) * nr;
579 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
580 }
581
582 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
583 int nr, u64 val)
584 {
585 unsigned long ptr;
586 ptr = offsetof(struct btrfs_node, ptrs) +
587 sizeof(struct btrfs_key_ptr) * nr;
588 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
589 }
590
591 static unsigned long btrfs_node_key_ptr_offset(int nr)
592 {
593 return offsetof(struct btrfs_node, ptrs) +
594 sizeof(struct btrfs_key_ptr) * nr;
595 }
596
597 static void btrfs_node_key(struct extent_buffer *eb,
598 struct btrfs_disk_key *disk_key, int nr)
599 {
600 unsigned long ptr;
601 ptr = btrfs_node_key_ptr_offset(nr);
602 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
603 struct btrfs_key_ptr, key, disk_key);
604 }
605 static inline void btrfs_set_node_key(struct extent_buffer *eb,
606 struct btrfs_disk_key *disk_key, int nr)
607 {
608 unsigned long ptr;
609 ptr = btrfs_node_key_ptr_offset(nr);
610 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
611 struct btrfs_key_ptr, key, disk_key);
612 }
613
614 /* struct btrfs_item */
615 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
616 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
617
618 static inline unsigned long btrfs_item_nr_offset(int nr)
619 {
620 return offsetof(struct btrfs_leaf, items) +
621 sizeof(struct btrfs_item) * nr;
622 }
623
624 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
625 int nr)
626 {
627 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
628 }
629
630 static inline u32 btrfs_item_end(struct extent_buffer *eb,
631 struct btrfs_item *item)
632 {
633 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
634 }
635
636 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
637 {
638 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
639 }
640
641 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
642 {
643 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
644 }
645
646 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
647 {
648 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
649 }
650
651 static inline void btrfs_item_key(struct extent_buffer *eb,
652 struct btrfs_disk_key *disk_key, int nr)
653 {
654 struct btrfs_item *item = btrfs_item_nr(eb, nr);
655 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
656 }
657
658 static inline void btrfs_set_item_key(struct extent_buffer *eb,
659 struct btrfs_disk_key *disk_key, int nr)
660 {
661 struct btrfs_item *item = btrfs_item_nr(eb, nr);
662 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
663 }
664
665 /* struct btrfs_dir_item */
666 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
667 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
668 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
669
670 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
671 struct btrfs_dir_item *item,
672 struct btrfs_disk_key *key)
673 {
674 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
675 }
676
677 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
678 struct btrfs_dir_item *item,
679 struct btrfs_disk_key *key)
680 {
681 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
682 }
683
684 /* struct btrfs_disk_key */
685 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
686 objectid, 64);
687 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
688 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
689
690 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
691 struct btrfs_disk_key *disk)
692 {
693 cpu->offset = le64_to_cpu(disk->offset);
694 cpu->type = disk->type;
695 cpu->objectid = le64_to_cpu(disk->objectid);
696 }
697
698 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
699 struct btrfs_key *cpu)
700 {
701 disk->offset = cpu_to_le64(cpu->offset);
702 disk->type = cpu->type;
703 disk->objectid = cpu_to_le64(cpu->objectid);
704 }
705
706 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
707 struct btrfs_key *key, int nr)
708 {
709 struct btrfs_disk_key disk_key;
710 btrfs_node_key(eb, &disk_key, nr);
711 btrfs_disk_key_to_cpu(key, &disk_key);
712 }
713
714 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
715 struct btrfs_key *key, int nr)
716 {
717 struct btrfs_disk_key disk_key;
718 btrfs_item_key(eb, &disk_key, nr);
719 btrfs_disk_key_to_cpu(key, &disk_key);
720 }
721
722 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
723 struct btrfs_dir_item *item,
724 struct btrfs_key *key)
725 {
726 struct btrfs_disk_key disk_key;
727 btrfs_dir_item_key(eb, item, &disk_key);
728 btrfs_disk_key_to_cpu(key, &disk_key);
729 }
730
731
732 static inline u8 btrfs_key_type(struct btrfs_key *key)
733 {
734 return key->type;
735 }
736
737 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
738 {
739 key->type = val;
740 }
741
742 /* struct btrfs_header */
743 BTRFS_SETGET_HEADER_FUNCS(header_blocknr, struct btrfs_header, blocknr, 64);
744 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
745 generation, 64);
746 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
747 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
748 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
749 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
750
751 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
752 {
753 unsigned long ptr = offsetof(struct btrfs_header, fsid);
754 return (u8 *)ptr;
755 }
756
757 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
758 {
759 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
760 return (u8 *)ptr;
761 }
762
763 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
764 {
765 unsigned long ptr = offsetof(struct btrfs_header, csum);
766 return (u8 *)ptr;
767 }
768
769 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
770 {
771 return NULL;
772 }
773
774 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
775 {
776 return NULL;
777 }
778
779 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
780 {
781 return NULL;
782 }
783
784 static inline int btrfs_is_leaf(struct extent_buffer *eb)
785 {
786 return (btrfs_header_level(eb) == 0);
787 }
788
789 /* struct btrfs_root_item */
790 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
791 BTRFS_SETGET_FUNCS(disk_root_blocknr, struct btrfs_root_item, blocknr, 64);
792
793 BTRFS_SETGET_STACK_FUNCS(root_blocknr, struct btrfs_root_item, blocknr, 64);
794 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
795 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
796 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
797 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, blocks_used, 64);
798 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, block_limit, 64);
799
800 /* struct btrfs_super_block */
801 BTRFS_SETGET_STACK_FUNCS(super_blocknr, struct btrfs_super_block, blocknr, 64);
802 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
803 generation, 64);
804 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
805 BTRFS_SETGET_STACK_FUNCS(super_total_blocks, struct btrfs_super_block,
806 total_blocks, 64);
807 BTRFS_SETGET_STACK_FUNCS(super_blocks_used, struct btrfs_super_block,
808 blocks_used, 64);
809 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
810 sectorsize, 32);
811 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
812 nodesize, 32);
813 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
814 leafsize, 32);
815 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
816 root_dir_objectid, 64);
817
818 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
819 {
820 return offsetof(struct btrfs_leaf, items);
821 }
822
823 /* struct btrfs_file_extent_item */
824 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
825
826 static inline unsigned long btrfs_file_extent_inline_start(struct
827 btrfs_file_extent_item *e)
828 {
829 unsigned long offset = (unsigned long)e;
830 offset += offsetof(struct btrfs_file_extent_item, disk_blocknr);
831 return offset;
832 }
833
834 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
835 {
836 return offsetof(struct btrfs_file_extent_item, disk_blocknr) + datasize;
837 }
838
839 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
840 struct btrfs_item *e)
841 {
842 unsigned long offset;
843 offset = offsetof(struct btrfs_file_extent_item, disk_blocknr);
844 return btrfs_item_size(eb, e) - offset;
845 }
846
847 BTRFS_SETGET_FUNCS(file_extent_disk_blocknr, struct btrfs_file_extent_item,
848 disk_blocknr, 64);
849 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
850 generation, 64);
851 BTRFS_SETGET_FUNCS(file_extent_disk_num_blocks, struct btrfs_file_extent_item,
852 disk_num_blocks, 64);
853 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
854 offset, 64);
855 BTRFS_SETGET_FUNCS(file_extent_num_blocks, struct btrfs_file_extent_item,
856 num_blocks, 64);
857
858 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
859 {
860 return sb->s_fs_info;
861 }
862
863 static inline int btrfs_set_root_name(struct btrfs_root *root,
864 const char *name, int len)
865 {
866 /* if we already have a name just free it */
867 if (root->name)
868 kfree(root->name);
869
870 root->name = kmalloc(len+1, GFP_KERNEL);
871 if (!root->name)
872 return -ENOMEM;
873
874 memcpy(root->name, name, len);
875 root->name[len] ='\0';
876
877 return 0;
878 }
879
880 /* helper function to cast into the data area of the leaf. */
881 #define btrfs_item_ptr(leaf, slot, type) \
882 ((type *)(btrfs_leaf_data(leaf) + \
883 btrfs_item_offset_nr(leaf, slot)))
884
885 #define btrfs_item_ptr_offset(leaf, slot) \
886 ((unsigned long)(btrfs_leaf_data(leaf) + \
887 btrfs_item_offset_nr(leaf, slot)))
888
889 /* mount option defines and helpers */
890 #define BTRFS_MOUNT_SUBVOL 0x000001
891 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
892 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
893 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
894 BTRFS_MOUNT_##opt)
895 /* extent-tree.c */
896 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
897 struct btrfs_root *root);
898 int btrfs_copy_pinned(struct btrfs_root *root, struct radix_tree_root *copy);
899 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
900 btrfs_fs_info *info,
901 u64 blocknr);
902 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
903 struct btrfs_block_group_cache
904 *hint, u64 search_start,
905 int data, int owner);
906 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
907 struct btrfs_root *root);
908 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
909 struct btrfs_root *root, u64 hint,
910 u64 empty_size);
911 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
912 struct btrfs_root *root, u64 owner,
913 u64 num_blocks, u64 empty_size, u64 search_start,
914 u64 search_end, struct btrfs_key *ins, int data);
915 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
916 struct extent_buffer *buf);
917 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
918 *root, u64 blocknr, u64 num_blocks, int pin);
919 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
920 struct btrfs_root *root,
921 struct radix_tree_root *unpin_radix);
922 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
923 struct btrfs_root *root,
924 u64 blocknr, u64 num_blocks);
925 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
926 struct btrfs_root *root);
927 int btrfs_free_block_groups(struct btrfs_fs_info *info);
928 int btrfs_read_block_groups(struct btrfs_root *root);
929 /* ctree.c */
930 int btrfs_cow_block(struct btrfs_trans_handle *trans,
931 struct btrfs_root *root, struct extent_buffer *buf,
932 struct extent_buffer *parent, int parent_slot,
933 struct extent_buffer **cow_ret);
934 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
935 *root, struct btrfs_path *path, u32 data_size);
936 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
937 struct btrfs_root *root,
938 struct btrfs_path *path,
939 u32 new_size);
940 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
941 *root, struct btrfs_key *key, struct btrfs_path *p, int
942 ins_len, int cow);
943 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
944 struct btrfs_root *root, struct extent_buffer *parent,
945 int cache_only, u64 *last_ret);
946 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
947 struct btrfs_path *btrfs_alloc_path(void);
948 void btrfs_free_path(struct btrfs_path *p);
949 void btrfs_init_path(struct btrfs_path *p);
950 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
951 struct btrfs_path *path);
952 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
953 *root, struct btrfs_key *key, void *data, u32 data_size);
954 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
955 *root, struct btrfs_path *path, struct btrfs_key
956 *cpu_key, u32 data_size);
957 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
958 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
959 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
960 *root);
961 /* root-item.c */
962 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
963 struct btrfs_key *key);
964 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
965 *root, struct btrfs_key *key, struct btrfs_root_item
966 *item);
967 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
968 *root, struct btrfs_key *key, struct btrfs_root_item
969 *item);
970 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
971 btrfs_root_item *item, struct btrfs_key *key);
972 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
973 struct btrfs_root *latest_root);
974 /* dir-item.c */
975 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
976 *root, const char *name, int name_len, u64 dir,
977 struct btrfs_key *location, u8 type);
978 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
979 struct btrfs_root *root,
980 struct btrfs_path *path, u64 dir,
981 const char *name, int name_len,
982 int mod);
983 struct btrfs_dir_item *
984 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
985 struct btrfs_root *root,
986 struct btrfs_path *path, u64 dir,
987 u64 objectid, const char *name, int name_len,
988 int mod);
989 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
990 struct btrfs_path *path,
991 const char *name, int name_len);
992 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
993 struct btrfs_root *root,
994 struct btrfs_path *path,
995 struct btrfs_dir_item *di);
996 /* inode-map.c */
997 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
998 struct btrfs_root *fs_root,
999 u64 dirid, u64 *objectid);
1000 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1001
1002 /* inode-item.c */
1003 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1004 struct btrfs_root *root,
1005 struct btrfs_path *path, u64 objectid);
1006 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1007 *root, struct btrfs_path *path,
1008 struct btrfs_key *location, int mod);
1009
1010 /* file-item.c */
1011 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1012 struct btrfs_root *root,
1013 u64 objectid, u64 pos, u64 offset,
1014 u64 disk_num_blocks,
1015 u64 num_blocks);
1016 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1017 struct btrfs_root *root,
1018 struct btrfs_path *path, u64 objectid,
1019 u64 blocknr, int mod);
1020 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1021 struct btrfs_root *root,
1022 u64 objectid, u64 offset,
1023 char *data, size_t len);
1024 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1025 struct btrfs_root *root,
1026 struct btrfs_path *path,
1027 u64 objectid, u64 offset,
1028 int cow);
1029 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1030 struct btrfs_root *root, struct btrfs_path *path,
1031 u64 isize);
1032 /* inode.c */
1033 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1034 int btrfs_readpage(struct file *file, struct page *page);
1035 void btrfs_delete_inode(struct inode *inode);
1036 void btrfs_read_locked_inode(struct inode *inode);
1037 int btrfs_write_inode(struct inode *inode, int wait);
1038 void btrfs_dirty_inode(struct inode *inode);
1039 struct inode *btrfs_alloc_inode(struct super_block *sb);
1040 void btrfs_destroy_inode(struct inode *inode);
1041 int btrfs_init_cachep(void);
1042 void btrfs_destroy_cachep(void);
1043 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1044 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1045 struct btrfs_root *root);
1046 int btrfs_commit_write(struct file *file, struct page *page,
1047 unsigned from, unsigned to);
1048 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1049 size_t page_offset, u64 start, u64 end,
1050 int create);
1051 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1052 struct btrfs_root *root,
1053 struct inode *inode);
1054 /* file.c */
1055 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1056 extern struct file_operations btrfs_file_operations;
1057 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1058 struct btrfs_root *root, struct inode *inode,
1059 u64 start, u64 end, u64 *hint_block);
1060 /* tree-defrag.c */
1061 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1062 struct btrfs_root *root, int cache_only);
1063
1064 /* sysfs.c */
1065 int btrfs_init_sysfs(void);
1066 void btrfs_exit_sysfs(void);
1067 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1068 int btrfs_sysfs_add_root(struct btrfs_root *root);
1069 void btrfs_sysfs_del_root(struct btrfs_root *root);
1070 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1071
1072 #endif
Linux kernel - Deliverables
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