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Btrfs: Allow tails larger than one page
[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 if (eb->map_token && offset >= eb->map_start && \
440 offset + sizeof(((type *)0)->member) <= eb->map_start + \
441 eb->map_len) { \
442 kaddr = eb->kaddr; \
443 map_start = eb->map_start; \
444 err = 0; \
445 } else { \
446 err = map_extent_buffer(eb, offset, \
447 sizeof(((type *)0)->member), \
448 &map_token, &kaddr, \
449 &map_start, &map_len, KM_USER1); \
450 } \
451 if (!err) { \
452 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
453 map_start); \
454 u##bits res = le##bits##_to_cpu(*tmp); \
455 if (unmap_on_exit) \
456 unmap_extent_buffer(eb, map_token, KM_USER1); \
457 return res; \
458 } else { \
459 __le##bits res; \
460 read_eb_member(eb, s, type, member, &res); \
461 return le##bits##_to_cpu(res); \
462 } \
463 } \
464 static inline void btrfs_set_##name(struct extent_buffer *eb, \
465 type *s, u##bits val) \
466 { \
467 int err; \
468 char *map_token; \
469 char *kaddr; \
470 unsigned long map_start; \
471 unsigned long map_len; \
472 int unmap_on_exit = (eb->map_token == NULL); \
473 unsigned long offset = (unsigned long)s + \
474 offsetof(type, member); \
475 if (eb->map_token && offset >= eb->map_start && \
476 offset + sizeof(((type *)0)->member) <= eb->map_start + \
477 eb->map_len) { \
478 kaddr = eb->kaddr; \
479 map_start = eb->map_start; \
480 err = 0; \
481 } else { \
482 err = map_extent_buffer(eb, offset, \
483 sizeof(((type *)0)->member), \
484 &map_token, &kaddr, \
485 &map_start, &map_len, KM_USER1); \
486 } \
487 if (!err) { \
488 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
489 map_start); \
490 *tmp = cpu_to_le##bits(val); \
491 if (unmap_on_exit) \
492 unmap_extent_buffer(eb, map_token, KM_USER1); \
493 } else { \
494 val = cpu_to_le##bits(val); \
495 write_eb_member(eb, s, type, member, &val); \
496 } \
497 }
498
499 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
500 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
501 { \
502 int err; \
503 char *map_token; \
504 char *kaddr; \
505 unsigned long map_start; \
506 unsigned long map_len; \
507 unsigned long offset = offsetof(type, member); \
508 int unmap_on_exit = (eb->map_token == NULL); \
509 if (eb->map_token && offset >= eb->map_start && \
510 offset + sizeof(((type *)0)->member) <= eb->map_start + \
511 eb->map_len) { \
512 kaddr = eb->kaddr; \
513 map_start = eb->map_start; \
514 err = 0; \
515 } else { \
516 err = map_extent_buffer(eb, offset, \
517 sizeof(((type *)0)->member), \
518 &map_token, &kaddr, \
519 &map_start, &map_len, KM_USER1); \
520 } \
521 if (!err) { \
522 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
523 map_start); \
524 u##bits res = le##bits##_to_cpu(*tmp); \
525 if (unmap_on_exit) \
526 unmap_extent_buffer(eb, map_token, KM_USER1); \
527 return res; \
528 } else { \
529 __le##bits res; \
530 read_eb_member(eb, NULL, type, member, &res); \
531 return le##bits##_to_cpu(res); \
532 } \
533 } \
534 static inline void btrfs_set_##name(struct extent_buffer *eb, \
535 u##bits val) \
536 { \
537 int err; \
538 char *map_token; \
539 char *kaddr; \
540 unsigned long map_start; \
541 unsigned long map_len; \
542 unsigned long offset = offsetof(type, member); \
543 int unmap_on_exit = (eb->map_token == NULL); \
544 if (eb->map_token && offset >= eb->map_start && \
545 offset + sizeof(((type *)0)->member) <= eb->map_start + \
546 eb->map_len) { \
547 kaddr = eb->kaddr; \
548 map_start = eb->map_start; \
549 err = 0; \
550 } else { \
551 err = map_extent_buffer(eb, offset, \
552 sizeof(((type *)0)->member), \
553 &map_token, &kaddr, \
554 &map_start, &map_len, KM_USER1); \
555 } \
556 if (!err) { \
557 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
558 map_start); \
559 *tmp = cpu_to_le##bits(val); \
560 if (unmap_on_exit) \
561 unmap_extent_buffer(eb, map_token, KM_USER1); \
562 } else { \
563 val = cpu_to_le##bits(val); \
564 write_eb_member(eb, NULL, type, member, &val); \
565 } \
566 }
567
568 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
569 static inline u##bits btrfs_##name(type *s) \
570 { \
571 return le##bits##_to_cpu(s->member); \
572 } \
573 static inline void btrfs_set_##name(type *s, u##bits val) \
574 { \
575 s->member = cpu_to_le##bits(val); \
576 }
577
578 /* struct btrfs_block_group_item */
579 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
580 used, 64);
581 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
582 used, 64);
583
584 /* struct btrfs_inode_item */
585 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
586 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
587 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
588 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
589 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
590 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
591 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
592 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
593 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
594 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
595 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
596 compat_flags, 16);
597
598 static inline struct btrfs_inode_timespec *
599 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
600 {
601 unsigned long ptr = (unsigned long)inode_item;
602 ptr += offsetof(struct btrfs_inode_item, atime);
603 return (struct btrfs_inode_timespec *)ptr;
604 }
605
606 static inline struct btrfs_inode_timespec *
607 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
608 {
609 unsigned long ptr = (unsigned long)inode_item;
610 ptr += offsetof(struct btrfs_inode_item, mtime);
611 return (struct btrfs_inode_timespec *)ptr;
612 }
613
614 static inline struct btrfs_inode_timespec *
615 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
616 {
617 unsigned long ptr = (unsigned long)inode_item;
618 ptr += offsetof(struct btrfs_inode_item, ctime);
619 return (struct btrfs_inode_timespec *)ptr;
620 }
621
622 static inline struct btrfs_inode_timespec *
623 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
624 {
625 unsigned long ptr = (unsigned long)inode_item;
626 ptr += offsetof(struct btrfs_inode_item, otime);
627 return (struct btrfs_inode_timespec *)ptr;
628 }
629
630 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
631 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
632
633 /* struct btrfs_extent_item */
634 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
635 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
636
637 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
638 refs, 32);
639 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
640 owner, 32);
641
642 /* struct btrfs_node */
643 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
644
645 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
646 {
647 unsigned long ptr;
648 ptr = offsetof(struct btrfs_node, ptrs) +
649 sizeof(struct btrfs_key_ptr) * nr;
650 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
651 }
652
653 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
654 int nr, u64 val)
655 {
656 unsigned long ptr;
657 ptr = offsetof(struct btrfs_node, ptrs) +
658 sizeof(struct btrfs_key_ptr) * nr;
659 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
660 }
661
662 static unsigned long btrfs_node_key_ptr_offset(int nr)
663 {
664 return offsetof(struct btrfs_node, ptrs) +
665 sizeof(struct btrfs_key_ptr) * nr;
666 }
667
668 static void btrfs_node_key(struct extent_buffer *eb,
669 struct btrfs_disk_key *disk_key, int nr)
670 {
671 unsigned long ptr;
672 ptr = btrfs_node_key_ptr_offset(nr);
673 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
674 struct btrfs_key_ptr, key, disk_key);
675 }
676 static inline void btrfs_set_node_key(struct extent_buffer *eb,
677 struct btrfs_disk_key *disk_key, int nr)
678 {
679 unsigned long ptr;
680 ptr = btrfs_node_key_ptr_offset(nr);
681 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
682 struct btrfs_key_ptr, key, disk_key);
683 }
684
685 /* struct btrfs_item */
686 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
687 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
688
689 static inline unsigned long btrfs_item_nr_offset(int nr)
690 {
691 return offsetof(struct btrfs_leaf, items) +
692 sizeof(struct btrfs_item) * nr;
693 }
694
695 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
696 int nr)
697 {
698 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
699 }
700
701 static inline u32 btrfs_item_end(struct extent_buffer *eb,
702 struct btrfs_item *item)
703 {
704 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
705 }
706
707 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
708 {
709 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
710 }
711
712 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
713 {
714 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
715 }
716
717 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
718 {
719 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
720 }
721
722 static inline void btrfs_item_key(struct extent_buffer *eb,
723 struct btrfs_disk_key *disk_key, int nr)
724 {
725 struct btrfs_item *item = btrfs_item_nr(eb, nr);
726 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
727 }
728
729 static inline void btrfs_set_item_key(struct extent_buffer *eb,
730 struct btrfs_disk_key *disk_key, int nr)
731 {
732 struct btrfs_item *item = btrfs_item_nr(eb, nr);
733 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
734 }
735
736 /* struct btrfs_dir_item */
737 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
738 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
739 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
740
741 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
742 struct btrfs_dir_item *item,
743 struct btrfs_disk_key *key)
744 {
745 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
746 }
747
748 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
749 struct btrfs_dir_item *item,
750 struct btrfs_disk_key *key)
751 {
752 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
753 }
754
755 /* struct btrfs_disk_key */
756 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
757 objectid, 64);
758 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
759 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
760
761 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
762 struct btrfs_disk_key *disk)
763 {
764 cpu->offset = le64_to_cpu(disk->offset);
765 cpu->type = disk->type;
766 cpu->objectid = le64_to_cpu(disk->objectid);
767 }
768
769 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
770 struct btrfs_key *cpu)
771 {
772 disk->offset = cpu_to_le64(cpu->offset);
773 disk->type = cpu->type;
774 disk->objectid = cpu_to_le64(cpu->objectid);
775 }
776
777 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
778 struct btrfs_key *key, int nr)
779 {
780 struct btrfs_disk_key disk_key;
781 btrfs_node_key(eb, &disk_key, nr);
782 btrfs_disk_key_to_cpu(key, &disk_key);
783 }
784
785 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
786 struct btrfs_key *key, int nr)
787 {
788 struct btrfs_disk_key disk_key;
789 btrfs_item_key(eb, &disk_key, nr);
790 btrfs_disk_key_to_cpu(key, &disk_key);
791 }
792
793 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
794 struct btrfs_dir_item *item,
795 struct btrfs_key *key)
796 {
797 struct btrfs_disk_key disk_key;
798 btrfs_dir_item_key(eb, item, &disk_key);
799 btrfs_disk_key_to_cpu(key, &disk_key);
800 }
801
802
803 static inline u8 btrfs_key_type(struct btrfs_key *key)
804 {
805 return key->type;
806 }
807
808 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
809 {
810 key->type = val;
811 }
812
813 /* struct btrfs_header */
814 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
815 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
816 generation, 64);
817 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
818 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
819 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
820 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
821
822 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
823 {
824 unsigned long ptr = offsetof(struct btrfs_header, fsid);
825 return (u8 *)ptr;
826 }
827
828 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
829 {
830 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
831 return (u8 *)ptr;
832 }
833
834 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
835 {
836 unsigned long ptr = offsetof(struct btrfs_header, csum);
837 return (u8 *)ptr;
838 }
839
840 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
841 {
842 return NULL;
843 }
844
845 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
846 {
847 return NULL;
848 }
849
850 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
851 {
852 return NULL;
853 }
854
855 static inline int btrfs_is_leaf(struct extent_buffer *eb)
856 {
857 return (btrfs_header_level(eb) == 0);
858 }
859
860 /* struct btrfs_root_item */
861 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
862 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
863 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
864
865 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
866 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
867 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
868 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
869 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
870 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
871 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
872
873 /* struct btrfs_super_block */
874 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
875 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
876 generation, 64);
877 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
878 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
879 root_level, 8);
880 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
881 total_bytes, 64);
882 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
883 bytes_used, 64);
884 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
885 sectorsize, 32);
886 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
887 nodesize, 32);
888 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
889 leafsize, 32);
890 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
891 root_dir_objectid, 64);
892
893 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
894 {
895 return offsetof(struct btrfs_leaf, items);
896 }
897
898 /* struct btrfs_file_extent_item */
899 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
900
901 static inline unsigned long btrfs_file_extent_inline_start(struct
902 btrfs_file_extent_item *e)
903 {
904 unsigned long offset = (unsigned long)e;
905 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
906 return offset;
907 }
908
909 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
910 {
911 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
912 }
913
914 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
915 struct btrfs_item *e)
916 {
917 unsigned long offset;
918 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
919 return btrfs_item_size(eb, e) - offset;
920 }
921
922 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
923 disk_bytenr, 64);
924 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
925 generation, 64);
926 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
927 disk_num_bytes, 64);
928 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
929 offset, 64);
930 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
931 num_bytes, 64);
932
933 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
934 {
935 return sb->s_fs_info;
936 }
937
938 static inline int btrfs_set_root_name(struct btrfs_root *root,
939 const char *name, int len)
940 {
941 /* if we already have a name just free it */
942 if (root->name)
943 kfree(root->name);
944
945 root->name = kmalloc(len+1, GFP_KERNEL);
946 if (!root->name)
947 return -ENOMEM;
948
949 memcpy(root->name, name, len);
950 root->name[len] ='\0';
951
952 return 0;
953 }
954
955 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
956 if (level == 0)
957 return root->leafsize;
958 return root->nodesize;
959 }
960
961 /* helper function to cast into the data area of the leaf. */
962 #define btrfs_item_ptr(leaf, slot, type) \
963 ((type *)(btrfs_leaf_data(leaf) + \
964 btrfs_item_offset_nr(leaf, slot)))
965
966 #define btrfs_item_ptr_offset(leaf, slot) \
967 ((unsigned long)(btrfs_leaf_data(leaf) + \
968 btrfs_item_offset_nr(leaf, slot)))
969
970 /* mount option defines and helpers */
971 #define BTRFS_MOUNT_SUBVOL 0x000001
972 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
973 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
974 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
975 BTRFS_MOUNT_##opt)
976 /* extent-tree.c */
977 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
978 struct btrfs_root *root);
979 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
980 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
981 btrfs_fs_info *info,
982 u64 bytenr);
983 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
984 struct btrfs_block_group_cache
985 *hint, u64 search_start,
986 int data, int owner);
987 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
988 struct btrfs_root *root);
989 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
990 struct btrfs_root *root, u32 size,
991 u64 hint, u64 empty_size);
992 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
993 struct btrfs_root *root, u64 owner,
994 u64 num_bytes, u64 empty_size, u64 search_start,
995 u64 search_end, struct btrfs_key *ins, int data);
996 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
997 struct extent_buffer *buf);
998 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
999 *root, u64 bytenr, u64 num_bytes, int pin);
1000 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1001 struct btrfs_root *root,
1002 struct extent_map_tree *unpin);
1003 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1004 struct btrfs_root *root,
1005 u64 bytenr, u64 num_bytes);
1006 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1007 struct btrfs_root *root);
1008 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1009 int btrfs_read_block_groups(struct btrfs_root *root);
1010 /* ctree.c */
1011 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1012 struct btrfs_root *root, struct extent_buffer *buf,
1013 struct extent_buffer *parent, int parent_slot,
1014 struct extent_buffer **cow_ret);
1015 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1016 *root, struct btrfs_path *path, u32 data_size);
1017 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1018 struct btrfs_root *root,
1019 struct btrfs_path *path,
1020 u32 new_size);
1021 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1022 *root, struct btrfs_key *key, struct btrfs_path *p, int
1023 ins_len, int cow);
1024 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1025 struct btrfs_root *root, struct extent_buffer *parent,
1026 int cache_only, u64 *last_ret);
1027 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1028 struct btrfs_path *btrfs_alloc_path(void);
1029 void btrfs_free_path(struct btrfs_path *p);
1030 void btrfs_init_path(struct btrfs_path *p);
1031 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1032 struct btrfs_path *path);
1033 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1034 *root, struct btrfs_key *key, void *data, u32 data_size);
1035 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1036 *root, struct btrfs_path *path, struct btrfs_key
1037 *cpu_key, u32 data_size);
1038 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1039 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1040 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1041 *root);
1042 /* root-item.c */
1043 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1044 struct btrfs_key *key);
1045 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1046 *root, struct btrfs_key *key, struct btrfs_root_item
1047 *item);
1048 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1049 *root, struct btrfs_key *key, struct btrfs_root_item
1050 *item);
1051 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1052 btrfs_root_item *item, struct btrfs_key *key);
1053 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1054 struct btrfs_root *latest_root);
1055 /* dir-item.c */
1056 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1057 *root, const char *name, int name_len, u64 dir,
1058 struct btrfs_key *location, u8 type);
1059 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1060 struct btrfs_root *root,
1061 struct btrfs_path *path, u64 dir,
1062 const char *name, int name_len,
1063 int mod);
1064 struct btrfs_dir_item *
1065 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1066 struct btrfs_root *root,
1067 struct btrfs_path *path, u64 dir,
1068 u64 objectid, const char *name, int name_len,
1069 int mod);
1070 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1071 struct btrfs_path *path,
1072 const char *name, int name_len);
1073 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1074 struct btrfs_root *root,
1075 struct btrfs_path *path,
1076 struct btrfs_dir_item *di);
1077 /* inode-map.c */
1078 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1079 struct btrfs_root *fs_root,
1080 u64 dirid, u64 *objectid);
1081 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1082
1083 /* inode-item.c */
1084 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1085 struct btrfs_root *root,
1086 struct btrfs_path *path, u64 objectid);
1087 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1088 *root, struct btrfs_path *path,
1089 struct btrfs_key *location, int mod);
1090
1091 /* file-item.c */
1092 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1093 struct btrfs_root *root,
1094 u64 objectid, u64 pos, u64 offset,
1095 u64 disk_num_bytes,
1096 u64 num_bytes);
1097 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1098 struct btrfs_root *root,
1099 struct btrfs_path *path, u64 objectid,
1100 u64 bytenr, int mod);
1101 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1102 struct btrfs_root *root,
1103 u64 objectid, u64 offset,
1104 char *data, size_t len);
1105 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1106 struct btrfs_root *root,
1107 struct btrfs_path *path,
1108 u64 objectid, u64 offset,
1109 int cow);
1110 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1111 struct btrfs_root *root, struct btrfs_path *path,
1112 u64 isize);
1113 /* inode.c */
1114 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1115 int btrfs_readpage(struct file *file, struct page *page);
1116 void btrfs_delete_inode(struct inode *inode);
1117 void btrfs_read_locked_inode(struct inode *inode);
1118 int btrfs_write_inode(struct inode *inode, int wait);
1119 void btrfs_dirty_inode(struct inode *inode);
1120 struct inode *btrfs_alloc_inode(struct super_block *sb);
1121 void btrfs_destroy_inode(struct inode *inode);
1122 int btrfs_init_cachep(void);
1123 void btrfs_destroy_cachep(void);
1124 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1125 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1126 struct btrfs_root *root);
1127 int btrfs_commit_write(struct file *file, struct page *page,
1128 unsigned from, unsigned to);
1129 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1130 size_t page_offset, u64 start, u64 end,
1131 int create);
1132 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1133 struct btrfs_root *root,
1134 struct inode *inode);
1135 /* file.c */
1136 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1137 extern struct file_operations btrfs_file_operations;
1138 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1139 struct btrfs_root *root, struct inode *inode,
1140 u64 start, u64 end, u64 inline_end, u64 *hint_block);
1141 /* tree-defrag.c */
1142 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1143 struct btrfs_root *root, int cache_only);
1144
1145 /* sysfs.c */
1146 int btrfs_init_sysfs(void);
1147 void btrfs_exit_sysfs(void);
1148 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1149 int btrfs_sysfs_add_root(struct btrfs_root *root);
1150 void btrfs_sysfs_del_root(struct btrfs_root *root);
1151 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1152
1153 #endif
Linux kernel - Deliverables
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