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Btrfs: Allow tree blocks larger than the page size
[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 bytenr; /* 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 bytenr; /* this block number */
126 __le64 magic;
127 __le64 generation;
128 __le64 root;
129 __le64 total_bytes;
130 __le64 bytes_used;
131 __le64 root_dir_objectid;
132 __le32 sectorsize;
133 __le32 nodesize;
134 __le32 leafsize;
135 u8 root_level;
136 } __attribute__ ((__packed__));
137
138 /*
139 * A leaf is full of items. offset and size tell us where to find
140 * the item in the leaf (relative to the start of the data area)
141 */
142 struct btrfs_item {
143 struct btrfs_disk_key key;
144 __le32 offset;
145 __le32 size;
146 } __attribute__ ((__packed__));
147
148 /*
149 * leaves have an item area and a data area:
150 * [item0, item1....itemN] [free space] [dataN...data1, data0]
151 *
152 * The data is separate from the items to get the keys closer together
153 * during searches.
154 */
155 struct btrfs_leaf {
156 struct btrfs_header header;
157 struct btrfs_item items[];
158 } __attribute__ ((__packed__));
159
160 /*
161 * all non-leaf blocks are nodes, they hold only keys and pointers to
162 * other blocks
163 */
164 struct btrfs_key_ptr {
165 struct btrfs_disk_key key;
166 __le64 blockptr;
167 } __attribute__ ((__packed__));
168
169 struct btrfs_node {
170 struct btrfs_header header;
171 struct btrfs_key_ptr ptrs[];
172 } __attribute__ ((__packed__));
173
174 /*
175 * btrfs_paths remember the path taken from the root down to the leaf.
176 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
177 * to any other levels that are present.
178 *
179 * The slots array records the index of the item or block pointer
180 * used while walking the tree.
181 */
182 struct btrfs_path {
183 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
184 int slots[BTRFS_MAX_LEVEL];
185 int reada;
186 int lowest_level;
187 };
188
189 /*
190 * items in the extent btree are used to record the objectid of the
191 * owner of the block and the number of references
192 */
193 struct btrfs_extent_item {
194 __le32 refs;
195 __le64 owner;
196 } __attribute__ ((__packed__));
197
198 struct btrfs_inode_timespec {
199 __le64 sec;
200 __le32 nsec;
201 } __attribute__ ((__packed__));
202
203 /*
204 * there is no padding here on purpose. If you want to extent the inode,
205 * make a new item type
206 */
207 struct btrfs_inode_item {
208 __le64 generation;
209 __le64 size;
210 __le64 nblocks;
211 __le64 block_group;
212 __le32 nlink;
213 __le32 uid;
214 __le32 gid;
215 __le32 mode;
216 __le32 rdev;
217 __le16 flags;
218 __le16 compat_flags;
219 struct btrfs_inode_timespec atime;
220 struct btrfs_inode_timespec ctime;
221 struct btrfs_inode_timespec mtime;
222 struct btrfs_inode_timespec otime;
223 } __attribute__ ((__packed__));
224
225 struct btrfs_dir_item {
226 struct btrfs_disk_key location;
227 __le16 flags;
228 __le16 name_len;
229 u8 type;
230 } __attribute__ ((__packed__));
231
232 struct btrfs_root_item {
233 struct btrfs_inode_item inode;
234 __le64 root_dirid;
235 __le64 bytenr;
236 __le64 byte_limit;
237 __le64 bytes_used;
238 __le32 flags;
239 __le32 refs;
240 struct btrfs_disk_key drop_progress;
241 u8 drop_level;
242 u8 level;
243 } __attribute__ ((__packed__));
244
245 #define BTRFS_FILE_EXTENT_REG 0
246 #define BTRFS_FILE_EXTENT_INLINE 1
247
248 struct btrfs_file_extent_item {
249 __le64 generation;
250 u8 type;
251 /*
252 * disk space consumed by the extent, checksum blocks are included
253 * in these numbers
254 */
255 __le64 disk_bytenr;
256 __le64 disk_num_bytes;
257 /*
258 * the logical offset in file blocks (no csums)
259 * this extent record is for. This allows a file extent to point
260 * into the middle of an existing extent on disk, sharing it
261 * between two snapshots (useful if some bytes in the middle of the
262 * extent have changed
263 */
264 __le64 offset;
265 /*
266 * the logical number of file blocks (no csums included)
267 */
268 __le64 num_bytes;
269 } __attribute__ ((__packed__));
270
271 struct btrfs_csum_item {
272 u8 csum;
273 } __attribute__ ((__packed__));
274
275 /* tag for the radix tree of block groups in ram */
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 int data;
289 int cached;
290 };
291
292 struct btrfs_fs_info {
293 u8 fsid[BTRFS_FSID_SIZE];
294 struct btrfs_root *extent_root;
295 struct btrfs_root *tree_root;
296 struct radix_tree_root fs_roots_radix;
297
298 struct extent_map_tree free_space_cache;
299 struct extent_map_tree block_group_cache;
300 struct extent_map_tree pinned_extents;
301 struct extent_map_tree pending_del;
302 struct extent_map_tree extent_ins;
303
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 int unmap_on_exit = (eb->map_token == NULL); \
435 unsigned long map_start; \
436 unsigned long map_len; \
437 unsigned long offset = (unsigned long)s + \
438 offsetof(type, member); \
439 err = map_extent_buffer(eb, offset, \
440 sizeof(((type *)0)->member), \
441 &map_token, &kaddr, \
442 &map_start, &map_len, KM_USER1); \
443 if (!err) { \
444 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
445 map_start); \
446 u##bits res = le##bits##_to_cpu(*tmp); \
447 if (unmap_on_exit) \
448 unmap_extent_buffer(eb, map_token, KM_USER1); \
449 return res; \
450 } else { \
451 __le##bits res; \
452 read_eb_member(eb, s, type, member, &res); \
453 return le##bits##_to_cpu(res); \
454 } \
455 } \
456 static inline void btrfs_set_##name(struct extent_buffer *eb, \
457 type *s, u##bits val) \
458 { \
459 int err; \
460 char *map_token; \
461 char *kaddr; \
462 unsigned long map_start; \
463 unsigned long map_len; \
464 int unmap_on_exit = (eb->map_token == NULL); \
465 unsigned long offset = (unsigned long)s + \
466 offsetof(type, member); \
467 err = map_extent_buffer(eb, offset, \
468 sizeof(((type *)0)->member), \
469 &map_token, &kaddr, \
470 &map_start, &map_len, KM_USER1); \
471 if (!err) { \
472 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
473 map_start); \
474 *tmp = cpu_to_le##bits(val); \
475 if (unmap_on_exit) \
476 unmap_extent_buffer(eb, map_token, KM_USER1); \
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 int unmap_on_exit = (eb->map_token == NULL); \
493 err = map_extent_buffer(eb, offset, \
494 sizeof(((type *)0)->member), \
495 &map_token, &kaddr, \
496 &map_start, &map_len, KM_USER1); \
497 if (!err) { \
498 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
499 map_start); \
500 u##bits res = le##bits##_to_cpu(*tmp); \
501 if (unmap_on_exit) \
502 unmap_extent_buffer(eb, map_token, KM_USER1); \
503 return res; \
504 } else { \
505 __le##bits res; \
506 read_eb_member(eb, NULL, type, member, &res); \
507 return le##bits##_to_cpu(res); \
508 } \
509 } \
510 static inline void btrfs_set_##name(struct extent_buffer *eb, \
511 u##bits val) \
512 { \
513 int err; \
514 char *map_token; \
515 char *kaddr; \
516 unsigned long map_start; \
517 unsigned long map_len; \
518 unsigned long offset = offsetof(type, member); \
519 int unmap_on_exit = (eb->map_token == NULL); \
520 err = map_extent_buffer(eb, offset, \
521 sizeof(((type *)0)->member), \
522 &map_token, &kaddr, \
523 &map_start, &map_len, KM_USER1); \
524 if (!err) { \
525 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
526 map_start); \
527 *tmp = cpu_to_le##bits(val); \
528 if (unmap_on_exit) \
529 unmap_extent_buffer(eb, map_token, KM_USER1); \
530 } else { \
531 val = cpu_to_le##bits(val); \
532 write_eb_member(eb, NULL, type, member, &val); \
533 } \
534 }
535
536 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
537 static inline u##bits btrfs_##name(type *s) \
538 { \
539 return le##bits##_to_cpu(s->member); \
540 } \
541 static inline void btrfs_set_##name(type *s, u##bits val) \
542 { \
543 s->member = cpu_to_le##bits(val); \
544 }
545
546 /* struct btrfs_block_group_item */
547 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
548 used, 64);
549 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
550 used, 64);
551
552 /* struct btrfs_inode_item */
553 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
554 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
555 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
556 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
557 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
558 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
559 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
560 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
561 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
562 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
563 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
564 compat_flags, 16);
565
566 static inline struct btrfs_inode_timespec *
567 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
568 {
569 unsigned long ptr = (unsigned long)inode_item;
570 ptr += offsetof(struct btrfs_inode_item, atime);
571 return (struct btrfs_inode_timespec *)ptr;
572 }
573
574 static inline struct btrfs_inode_timespec *
575 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
576 {
577 unsigned long ptr = (unsigned long)inode_item;
578 ptr += offsetof(struct btrfs_inode_item, mtime);
579 return (struct btrfs_inode_timespec *)ptr;
580 }
581
582 static inline struct btrfs_inode_timespec *
583 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
584 {
585 unsigned long ptr = (unsigned long)inode_item;
586 ptr += offsetof(struct btrfs_inode_item, ctime);
587 return (struct btrfs_inode_timespec *)ptr;
588 }
589
590 static inline struct btrfs_inode_timespec *
591 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
592 {
593 unsigned long ptr = (unsigned long)inode_item;
594 ptr += offsetof(struct btrfs_inode_item, otime);
595 return (struct btrfs_inode_timespec *)ptr;
596 }
597
598 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
599 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
600
601 /* struct btrfs_extent_item */
602 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
603 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
604
605 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
606 refs, 32);
607 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
608 owner, 32);
609
610 /* struct btrfs_node */
611 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
612
613 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
614 {
615 unsigned long ptr;
616 ptr = offsetof(struct btrfs_node, ptrs) +
617 sizeof(struct btrfs_key_ptr) * nr;
618 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
619 }
620
621 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
622 int nr, u64 val)
623 {
624 unsigned long ptr;
625 ptr = offsetof(struct btrfs_node, ptrs) +
626 sizeof(struct btrfs_key_ptr) * nr;
627 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
628 }
629
630 static unsigned long btrfs_node_key_ptr_offset(int nr)
631 {
632 return offsetof(struct btrfs_node, ptrs) +
633 sizeof(struct btrfs_key_ptr) * nr;
634 }
635
636 static void btrfs_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 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
642 struct btrfs_key_ptr, key, disk_key);
643 }
644 static inline void btrfs_set_node_key(struct extent_buffer *eb,
645 struct btrfs_disk_key *disk_key, int nr)
646 {
647 unsigned long ptr;
648 ptr = btrfs_node_key_ptr_offset(nr);
649 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
650 struct btrfs_key_ptr, key, disk_key);
651 }
652
653 /* struct btrfs_item */
654 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
655 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
656
657 static inline unsigned long btrfs_item_nr_offset(int nr)
658 {
659 return offsetof(struct btrfs_leaf, items) +
660 sizeof(struct btrfs_item) * nr;
661 }
662
663 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
664 int nr)
665 {
666 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
667 }
668
669 static inline u32 btrfs_item_end(struct extent_buffer *eb,
670 struct btrfs_item *item)
671 {
672 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
673 }
674
675 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
676 {
677 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
678 }
679
680 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
681 {
682 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
683 }
684
685 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
686 {
687 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
688 }
689
690 static inline void btrfs_item_key(struct extent_buffer *eb,
691 struct btrfs_disk_key *disk_key, int nr)
692 {
693 struct btrfs_item *item = btrfs_item_nr(eb, nr);
694 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
695 }
696
697 static inline void btrfs_set_item_key(struct extent_buffer *eb,
698 struct btrfs_disk_key *disk_key, int nr)
699 {
700 struct btrfs_item *item = btrfs_item_nr(eb, nr);
701 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
702 }
703
704 /* struct btrfs_dir_item */
705 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
706 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
707 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
708
709 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
710 struct btrfs_dir_item *item,
711 struct btrfs_disk_key *key)
712 {
713 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
714 }
715
716 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
717 struct btrfs_dir_item *item,
718 struct btrfs_disk_key *key)
719 {
720 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
721 }
722
723 /* struct btrfs_disk_key */
724 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
725 objectid, 64);
726 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
727 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
728
729 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
730 struct btrfs_disk_key *disk)
731 {
732 cpu->offset = le64_to_cpu(disk->offset);
733 cpu->type = disk->type;
734 cpu->objectid = le64_to_cpu(disk->objectid);
735 }
736
737 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
738 struct btrfs_key *cpu)
739 {
740 disk->offset = cpu_to_le64(cpu->offset);
741 disk->type = cpu->type;
742 disk->objectid = cpu_to_le64(cpu->objectid);
743 }
744
745 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
746 struct btrfs_key *key, int nr)
747 {
748 struct btrfs_disk_key disk_key;
749 btrfs_node_key(eb, &disk_key, nr);
750 btrfs_disk_key_to_cpu(key, &disk_key);
751 }
752
753 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
754 struct btrfs_key *key, int nr)
755 {
756 struct btrfs_disk_key disk_key;
757 btrfs_item_key(eb, &disk_key, nr);
758 btrfs_disk_key_to_cpu(key, &disk_key);
759 }
760
761 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
762 struct btrfs_dir_item *item,
763 struct btrfs_key *key)
764 {
765 struct btrfs_disk_key disk_key;
766 btrfs_dir_item_key(eb, item, &disk_key);
767 btrfs_disk_key_to_cpu(key, &disk_key);
768 }
769
770
771 static inline u8 btrfs_key_type(struct btrfs_key *key)
772 {
773 return key->type;
774 }
775
776 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
777 {
778 key->type = val;
779 }
780
781 /* struct btrfs_header */
782 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
783 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
784 generation, 64);
785 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
786 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
787 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
788 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
789
790 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
791 {
792 unsigned long ptr = offsetof(struct btrfs_header, fsid);
793 return (u8 *)ptr;
794 }
795
796 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
797 {
798 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
799 return (u8 *)ptr;
800 }
801
802 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
803 {
804 unsigned long ptr = offsetof(struct btrfs_header, csum);
805 return (u8 *)ptr;
806 }
807
808 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
809 {
810 return NULL;
811 }
812
813 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
814 {
815 return NULL;
816 }
817
818 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
819 {
820 return NULL;
821 }
822
823 static inline int btrfs_is_leaf(struct extent_buffer *eb)
824 {
825 return (btrfs_header_level(eb) == 0);
826 }
827
828 /* struct btrfs_root_item */
829 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
830 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
831 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
832
833 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
834 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
835 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
836 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
837 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
838 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
839 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
840
841 /* struct btrfs_super_block */
842 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
843 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
844 generation, 64);
845 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
846 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
847 root_level, 8);
848 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
849 total_bytes, 64);
850 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
851 bytes_used, 64);
852 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
853 sectorsize, 32);
854 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
855 nodesize, 32);
856 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
857 leafsize, 32);
858 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
859 root_dir_objectid, 64);
860
861 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
862 {
863 return offsetof(struct btrfs_leaf, items);
864 }
865
866 /* struct btrfs_file_extent_item */
867 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
868
869 static inline unsigned long btrfs_file_extent_inline_start(struct
870 btrfs_file_extent_item *e)
871 {
872 unsigned long offset = (unsigned long)e;
873 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
874 return offset;
875 }
876
877 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
878 {
879 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
880 }
881
882 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
883 struct btrfs_item *e)
884 {
885 unsigned long offset;
886 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
887 return btrfs_item_size(eb, e) - offset;
888 }
889
890 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
891 disk_bytenr, 64);
892 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
893 generation, 64);
894 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
895 disk_num_bytes, 64);
896 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
897 offset, 64);
898 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
899 num_bytes, 64);
900
901 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
902 {
903 return sb->s_fs_info;
904 }
905
906 static inline int btrfs_set_root_name(struct btrfs_root *root,
907 const char *name, int len)
908 {
909 /* if we already have a name just free it */
910 if (root->name)
911 kfree(root->name);
912
913 root->name = kmalloc(len+1, GFP_KERNEL);
914 if (!root->name)
915 return -ENOMEM;
916
917 memcpy(root->name, name, len);
918 root->name[len] ='\0';
919
920 return 0;
921 }
922
923 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
924 if (level == 0)
925 return root->leafsize;
926 return root->nodesize;
927 }
928
929 /* helper function to cast into the data area of the leaf. */
930 #define btrfs_item_ptr(leaf, slot, type) \
931 ((type *)(btrfs_leaf_data(leaf) + \
932 btrfs_item_offset_nr(leaf, slot)))
933
934 #define btrfs_item_ptr_offset(leaf, slot) \
935 ((unsigned long)(btrfs_leaf_data(leaf) + \
936 btrfs_item_offset_nr(leaf, slot)))
937
938 /* mount option defines and helpers */
939 #define BTRFS_MOUNT_SUBVOL 0x000001
940 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
941 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
942 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
943 BTRFS_MOUNT_##opt)
944 /* extent-tree.c */
945 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
946 struct btrfs_root *root);
947 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
948 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
949 btrfs_fs_info *info,
950 u64 bytenr);
951 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
952 struct btrfs_block_group_cache
953 *hint, u64 search_start,
954 int data, int owner);
955 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
956 struct btrfs_root *root);
957 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
958 struct btrfs_root *root, u32 size,
959 u64 hint, u64 empty_size);
960 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
961 struct btrfs_root *root, u64 owner,
962 u64 num_bytes, u64 empty_size, u64 search_start,
963 u64 search_end, struct btrfs_key *ins, int data);
964 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
965 struct extent_buffer *buf);
966 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
967 *root, u64 bytenr, u64 num_bytes, int pin);
968 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
969 struct btrfs_root *root,
970 struct extent_map_tree *unpin);
971 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
972 struct btrfs_root *root,
973 u64 bytenr, u64 num_bytes);
974 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
975 struct btrfs_root *root);
976 int btrfs_free_block_groups(struct btrfs_fs_info *info);
977 int btrfs_read_block_groups(struct btrfs_root *root);
978 /* ctree.c */
979 int btrfs_cow_block(struct btrfs_trans_handle *trans,
980 struct btrfs_root *root, struct extent_buffer *buf,
981 struct extent_buffer *parent, int parent_slot,
982 struct extent_buffer **cow_ret);
983 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
984 *root, struct btrfs_path *path, u32 data_size);
985 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
986 struct btrfs_root *root,
987 struct btrfs_path *path,
988 u32 new_size);
989 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
990 *root, struct btrfs_key *key, struct btrfs_path *p, int
991 ins_len, int cow);
992 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
993 struct btrfs_root *root, struct extent_buffer *parent,
994 int cache_only, u64 *last_ret);
995 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
996 struct btrfs_path *btrfs_alloc_path(void);
997 void btrfs_free_path(struct btrfs_path *p);
998 void btrfs_init_path(struct btrfs_path *p);
999 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1000 struct btrfs_path *path);
1001 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1002 *root, struct btrfs_key *key, void *data, u32 data_size);
1003 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1004 *root, struct btrfs_path *path, struct btrfs_key
1005 *cpu_key, u32 data_size);
1006 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1007 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1008 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1009 *root);
1010 /* root-item.c */
1011 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1012 struct btrfs_key *key);
1013 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1014 *root, struct btrfs_key *key, struct btrfs_root_item
1015 *item);
1016 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1017 *root, struct btrfs_key *key, struct btrfs_root_item
1018 *item);
1019 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1020 btrfs_root_item *item, struct btrfs_key *key);
1021 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1022 struct btrfs_root *latest_root);
1023 /* dir-item.c */
1024 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1025 *root, const char *name, int name_len, u64 dir,
1026 struct btrfs_key *location, u8 type);
1027 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1028 struct btrfs_root *root,
1029 struct btrfs_path *path, u64 dir,
1030 const char *name, int name_len,
1031 int mod);
1032 struct btrfs_dir_item *
1033 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1034 struct btrfs_root *root,
1035 struct btrfs_path *path, u64 dir,
1036 u64 objectid, const char *name, int name_len,
1037 int mod);
1038 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1039 struct btrfs_path *path,
1040 const char *name, int name_len);
1041 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1042 struct btrfs_root *root,
1043 struct btrfs_path *path,
1044 struct btrfs_dir_item *di);
1045 /* inode-map.c */
1046 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1047 struct btrfs_root *fs_root,
1048 u64 dirid, u64 *objectid);
1049 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1050
1051 /* inode-item.c */
1052 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1053 struct btrfs_root *root,
1054 struct btrfs_path *path, u64 objectid);
1055 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1056 *root, struct btrfs_path *path,
1057 struct btrfs_key *location, int mod);
1058
1059 /* file-item.c */
1060 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1061 struct btrfs_root *root,
1062 u64 objectid, u64 pos, u64 offset,
1063 u64 disk_num_bytes,
1064 u64 num_bytes);
1065 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1066 struct btrfs_root *root,
1067 struct btrfs_path *path, u64 objectid,
1068 u64 bytenr, int mod);
1069 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1070 struct btrfs_root *root,
1071 u64 objectid, u64 offset,
1072 char *data, size_t len);
1073 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1074 struct btrfs_root *root,
1075 struct btrfs_path *path,
1076 u64 objectid, u64 offset,
1077 int cow);
1078 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1079 struct btrfs_root *root, struct btrfs_path *path,
1080 u64 isize);
1081 /* inode.c */
1082 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1083 int btrfs_readpage(struct file *file, struct page *page);
1084 void btrfs_delete_inode(struct inode *inode);
1085 void btrfs_read_locked_inode(struct inode *inode);
1086 int btrfs_write_inode(struct inode *inode, int wait);
1087 void btrfs_dirty_inode(struct inode *inode);
1088 struct inode *btrfs_alloc_inode(struct super_block *sb);
1089 void btrfs_destroy_inode(struct inode *inode);
1090 int btrfs_init_cachep(void);
1091 void btrfs_destroy_cachep(void);
1092 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1093 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1094 struct btrfs_root *root);
1095 int btrfs_commit_write(struct file *file, struct page *page,
1096 unsigned from, unsigned to);
1097 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1098 size_t page_offset, u64 start, u64 end,
1099 int create);
1100 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1101 struct btrfs_root *root,
1102 struct inode *inode);
1103 /* file.c */
1104 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1105 extern struct file_operations btrfs_file_operations;
1106 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1107 struct btrfs_root *root, struct inode *inode,
1108 u64 start, u64 end, u64 *hint_block);
1109 /* tree-defrag.c */
1110 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1111 struct btrfs_root *root, int cache_only);
1112
1113 /* sysfs.c */
1114 int btrfs_init_sysfs(void);
1115 void btrfs_exit_sysfs(void);
1116 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1117 int btrfs_sysfs_add_root(struct btrfs_root *root);
1118 void btrfs_sysfs_del_root(struct btrfs_root *root);
1119 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1120
1121 #endif
Linux kernel - Deliverables
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