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10129cc6656f7fdb947a39d118f181be0d08475c
[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/version.h>
23 #include <linux/mm.h>
24 #include <linux/highmem.h>
25 #include <linux/fs.h>
26 #include <linux/workqueue.h>
27 #include <linux/completion.h>
28 #include <asm/kmap_types.h>
29 #include "bit-radix.h"
30 #include "extent_map.h"
31
32 struct btrfs_trans_handle;
33 struct btrfs_transaction;
34 extern struct kmem_cache *btrfs_trans_handle_cachep;
35 extern struct kmem_cache *btrfs_transaction_cachep;
36 extern struct kmem_cache *btrfs_bit_radix_cachep;
37 extern struct kmem_cache *btrfs_path_cachep;
38
39 #define BTRFS_MAGIC "_B2RfS_M"
40
41 #define BTRFS_MAX_LEVEL 8
42 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
43 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
44 #define BTRFS_FS_TREE_OBJECTID 3ULL
45 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
46 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
47
48 /*
49 * we can actually store much bigger names, but lets not confuse the rest
50 * of linux
51 */
52 #define BTRFS_NAME_LEN 255
53
54 /* 32 bytes in various csum fields */
55 #define BTRFS_CSUM_SIZE 32
56 /* four bytes for CRC32 */
57 #define BTRFS_CRC32_SIZE 4
58 #define BTRFS_EMPTY_DIR_SIZE 0
59
60 #define BTRFS_FT_UNKNOWN 0
61 #define BTRFS_FT_REG_FILE 1
62 #define BTRFS_FT_DIR 2
63 #define BTRFS_FT_CHRDEV 3
64 #define BTRFS_FT_BLKDEV 4
65 #define BTRFS_FT_FIFO 5
66 #define BTRFS_FT_SOCK 6
67 #define BTRFS_FT_SYMLINK 7
68 #define BTRFS_FT_XATTR 8
69 #define BTRFS_FT_MAX 9
70
71 /*
72 * the key defines the order in the tree, and so it also defines (optimal)
73 * block layout. objectid corresonds to the inode number. The flags
74 * tells us things about the object, and is a kind of stream selector.
75 * so for a given inode, keys with flags of 1 might refer to the inode
76 * data, flags of 2 may point to file data in the btree and flags == 3
77 * may point to extents.
78 *
79 * offset is the starting byte offset for this key in the stream.
80 *
81 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
82 * in cpu native order. Otherwise they are identical and their sizes
83 * should be the same (ie both packed)
84 */
85 struct btrfs_disk_key {
86 __le64 objectid;
87 u8 type;
88 __le64 offset;
89 } __attribute__ ((__packed__));
90
91 struct btrfs_key {
92 u64 objectid;
93 u8 type;
94 u64 offset;
95 } __attribute__ ((__packed__));
96
97 #define BTRFS_FSID_SIZE 16
98 /*
99 * every tree block (leaf or node) starts with this header.
100 */
101 struct btrfs_header {
102 u8 csum[BTRFS_CSUM_SIZE];
103 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
104 __le64 bytenr; /* which block this node is supposed to live in */
105 __le64 generation;
106 __le64 owner;
107 __le32 nritems;
108 __le16 flags;
109 u8 level;
110 } __attribute__ ((__packed__));
111
112 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
113 sizeof(struct btrfs_header)) / \
114 sizeof(struct btrfs_key_ptr))
115 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
116 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
117 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
118 sizeof(struct btrfs_item) - \
119 sizeof(struct btrfs_file_extent_item))
120
121 /*
122 * the super block basically lists the main trees of the FS
123 * it currently lacks any block count etc etc
124 */
125 struct btrfs_super_block {
126 u8 csum[BTRFS_CSUM_SIZE];
127 /* the first 3 fields must match struct btrfs_header */
128 u8 fsid[16]; /* FS specific uuid */
129 __le64 bytenr; /* this block number */
130 __le64 magic;
131 __le64 generation;
132 __le64 root;
133 __le64 total_bytes;
134 __le64 bytes_used;
135 __le64 root_dir_objectid;
136 __le32 sectorsize;
137 __le32 nodesize;
138 __le32 leafsize;
139 __le32 stripesize;
140 u8 root_level;
141 } __attribute__ ((__packed__));
142
143 /*
144 * A leaf is full of items. offset and size tell us where to find
145 * the item in the leaf (relative to the start of the data area)
146 */
147 struct btrfs_item {
148 struct btrfs_disk_key key;
149 __le32 offset;
150 __le32 size;
151 } __attribute__ ((__packed__));
152
153 /*
154 * leaves have an item area and a data area:
155 * [item0, item1....itemN] [free space] [dataN...data1, data0]
156 *
157 * The data is separate from the items to get the keys closer together
158 * during searches.
159 */
160 struct btrfs_leaf {
161 struct btrfs_header header;
162 struct btrfs_item items[];
163 } __attribute__ ((__packed__));
164
165 /*
166 * all non-leaf blocks are nodes, they hold only keys and pointers to
167 * other blocks
168 */
169 struct btrfs_key_ptr {
170 struct btrfs_disk_key key;
171 __le64 blockptr;
172 __le64 generation;
173 } __attribute__ ((__packed__));
174
175 struct btrfs_node {
176 struct btrfs_header header;
177 struct btrfs_key_ptr ptrs[];
178 } __attribute__ ((__packed__));
179
180 /*
181 * btrfs_paths remember the path taken from the root down to the leaf.
182 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
183 * to any other levels that are present.
184 *
185 * The slots array records the index of the item or block pointer
186 * used while walking the tree.
187 */
188 struct btrfs_path {
189 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
190 int slots[BTRFS_MAX_LEVEL];
191 int reada;
192 int lowest_level;
193 };
194
195 /*
196 * items in the extent btree are used to record the objectid of the
197 * owner of the block and the number of references
198 */
199 struct btrfs_extent_item {
200 __le32 refs;
201 } __attribute__ ((__packed__));
202
203 struct btrfs_extent_ref {
204 __le64 root;
205 __le64 generation;
206 __le64 objectid;
207 __le64 offset;
208 } __attribute__ ((__packed__));
209
210 struct btrfs_inode_ref {
211 __le16 name_len;
212 /* name goes here */
213 } __attribute__ ((__packed__));
214
215 struct btrfs_inode_timespec {
216 __le64 sec;
217 __le32 nsec;
218 } __attribute__ ((__packed__));
219
220 /*
221 * there is no padding here on purpose. If you want to extent the inode,
222 * make a new item type
223 */
224 struct btrfs_inode_item {
225 __le64 generation;
226 __le64 size;
227 __le64 nblocks;
228 __le64 block_group;
229 __le32 nlink;
230 __le32 uid;
231 __le32 gid;
232 __le32 mode;
233 __le32 rdev;
234 __le16 flags;
235 __le16 compat_flags;
236 struct btrfs_inode_timespec atime;
237 struct btrfs_inode_timespec ctime;
238 struct btrfs_inode_timespec mtime;
239 struct btrfs_inode_timespec otime;
240 } __attribute__ ((__packed__));
241
242 struct btrfs_dir_item {
243 struct btrfs_disk_key location;
244 __le16 data_len;
245 __le16 name_len;
246 u8 type;
247 } __attribute__ ((__packed__));
248
249 struct btrfs_root_item {
250 struct btrfs_inode_item inode;
251 __le64 root_dirid;
252 __le64 bytenr;
253 __le64 byte_limit;
254 __le64 bytes_used;
255 __le32 flags;
256 __le32 refs;
257 struct btrfs_disk_key drop_progress;
258 u8 drop_level;
259 u8 level;
260 } __attribute__ ((__packed__));
261
262 #define BTRFS_FILE_EXTENT_REG 0
263 #define BTRFS_FILE_EXTENT_INLINE 1
264
265 struct btrfs_file_extent_item {
266 __le64 generation;
267 u8 type;
268 /*
269 * disk space consumed by the extent, checksum blocks are included
270 * in these numbers
271 */
272 __le64 disk_bytenr;
273 __le64 disk_num_bytes;
274 /*
275 * the logical offset in file blocks (no csums)
276 * this extent record is for. This allows a file extent to point
277 * into the middle of an existing extent on disk, sharing it
278 * between two snapshots (useful if some bytes in the middle of the
279 * extent have changed
280 */
281 __le64 offset;
282 /*
283 * the logical number of file blocks (no csums included)
284 */
285 __le64 num_bytes;
286 } __attribute__ ((__packed__));
287
288 struct btrfs_csum_item {
289 u8 csum;
290 } __attribute__ ((__packed__));
291
292 /* tag for the radix tree of block groups in ram */
293 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
294
295
296 #define BTRFS_BLOCK_GROUP_DATA 1
297 #define BTRFS_BLOCK_GROUP_MIXED 2
298
299 struct btrfs_block_group_item {
300 __le64 used;
301 u8 flags;
302 } __attribute__ ((__packed__));
303
304 struct btrfs_block_group_cache {
305 struct btrfs_key key;
306 struct btrfs_block_group_item item;
307 int data;
308 int cached;
309 u64 pinned;
310 };
311 struct btrfs_fs_info {
312 u8 fsid[BTRFS_FSID_SIZE];
313 struct btrfs_root *extent_root;
314 struct btrfs_root *tree_root;
315 struct radix_tree_root fs_roots_radix;
316
317 struct extent_map_tree free_space_cache;
318 struct extent_map_tree block_group_cache;
319 struct extent_map_tree pinned_extents;
320 struct extent_map_tree pending_del;
321 struct extent_map_tree extent_ins;
322
323 u64 generation;
324 u64 last_trans_committed;
325 unsigned long mount_opt;
326 u64 max_extent;
327 struct btrfs_transaction *running_transaction;
328 struct btrfs_super_block super_copy;
329 struct extent_buffer *sb_buffer;
330 struct super_block *sb;
331 struct inode *btree_inode;
332 spinlock_t hash_lock;
333 struct mutex trans_mutex;
334 struct mutex fs_mutex;
335 struct list_head trans_list;
336 struct list_head hashers;
337 struct list_head dead_roots;
338 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
339 struct work_struct trans_work;
340 #else
341 struct delayed_work trans_work;
342 #endif
343 struct kobject super_kobj;
344 struct completion kobj_unregister;
345 int do_barriers;
346 int closing;
347
348 u64 total_pinned;
349 spinlock_t delalloc_lock;
350 u64 delalloc_bytes;
351 };
352 /*
353 * in ram representation of the tree. extent_root is used for all allocations
354 * and for the extent tree extent_root root.
355 */
356 struct btrfs_root {
357 struct extent_buffer *node;
358 struct extent_buffer *commit_root;
359 struct btrfs_root_item root_item;
360 struct btrfs_key root_key;
361 struct btrfs_fs_info *fs_info;
362 struct inode *inode;
363 struct kobject root_kobj;
364 struct completion kobj_unregister;
365 struct rw_semaphore snap_sem;
366 u64 objectid;
367 u64 last_trans;
368
369 /* data allocations are done in sectorsize units */
370 u32 sectorsize;
371
372 /* node allocations are done in nodesize units */
373 u32 nodesize;
374
375 /* leaf allocations are done in leafsize units */
376 u32 leafsize;
377
378 u32 stripesize;
379
380 u32 type;
381 u64 highest_inode;
382 u64 last_inode_alloc;
383 int ref_cows;
384 struct btrfs_key defrag_progress;
385 int defrag_running;
386 int defrag_level;
387 char *name;
388 };
389
390 /*
391 * inode items have the data typically returned from stat and store other
392 * info about object characteristics. There is one for every file and dir in
393 * the FS
394 */
395 #define BTRFS_INODE_ITEM_KEY 1
396 #define BTRFS_INODE_REF_KEY 2
397 #define BTRFS_XATTR_ITEM_KEY 8
398 /* reserve 2-15 close to the inode for later flexibility */
399
400 /*
401 * dir items are the name -> inode pointers in a directory. There is one
402 * for every name in a directory.
403 */
404 #define BTRFS_DIR_ITEM_KEY 16
405 #define BTRFS_DIR_INDEX_KEY 17
406 /*
407 * extent data is for file data
408 */
409 #define BTRFS_EXTENT_DATA_KEY 18
410 /*
411 * csum items have the checksums for data in the extents
412 */
413 #define BTRFS_CSUM_ITEM_KEY 19
414
415 /* reserve 20-31 for other file stuff */
416
417 /*
418 * root items point to tree roots. There are typically in the root
419 * tree used by the super block to find all the other trees
420 */
421 #define BTRFS_ROOT_ITEM_KEY 32
422 /*
423 * extent items are in the extent map tree. These record which blocks
424 * are used, and how many references there are to each block
425 */
426 #define BTRFS_EXTENT_ITEM_KEY 33
427 #define BTRFS_EXTENT_REF_KEY 34
428
429 /*
430 * block groups give us hints into the extent allocation trees. Which
431 * blocks are free etc etc
432 */
433 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
434
435 /*
436 * string items are for debugging. They just store a short string of
437 * data in the FS
438 */
439 #define BTRFS_STRING_ITEM_KEY 253
440
441 #define BTRFS_MOUNT_NODATASUM 0x1
442 #define BTRFS_MOUNT_NODATACOW 0x2
443
444 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
445 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
446 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
447 BTRFS_MOUNT_##opt)
448
449 /* some macros to generate set/get funcs for the struct fields. This
450 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
451 * one for u8:
452 */
453 #define le8_to_cpu(v) (v)
454 #define cpu_to_le8(v) (v)
455 #define __le8 u8
456
457 #define read_eb_member(eb, ptr, type, member, result) ( \
458 read_extent_buffer(eb, (char *)(result), \
459 ((unsigned long)(ptr)) + \
460 offsetof(type, member), \
461 sizeof(((type *)0)->member)))
462
463 #define write_eb_member(eb, ptr, type, member, result) ( \
464 write_extent_buffer(eb, (char *)(result), \
465 ((unsigned long)(ptr)) + \
466 offsetof(type, member), \
467 sizeof(((type *)0)->member)))
468
469 #ifndef BTRFS_SETGET_FUNCS
470 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
471 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
472 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
473 #endif
474
475 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
476 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
477 { \
478 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
479 unsigned long offset = offsetof(type, member); \
480 u##bits res; \
481 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
482 res = le##bits##_to_cpu(*tmp); \
483 kunmap_atomic(kaddr, KM_USER0); \
484 return res; \
485 } \
486 static inline void btrfs_set_##name(struct extent_buffer *eb, \
487 u##bits val) \
488 { \
489 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
490 unsigned long offset = offsetof(type, member); \
491 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
492 *tmp = cpu_to_le##bits(val); \
493 kunmap_atomic(kaddr, KM_USER0); \
494 }
495
496 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
497 static inline u##bits btrfs_##name(type *s) \
498 { \
499 return le##bits##_to_cpu(s->member); \
500 } \
501 static inline void btrfs_set_##name(type *s, u##bits val) \
502 { \
503 s->member = cpu_to_le##bits(val); \
504 }
505
506 /* struct btrfs_block_group_item */
507 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
508 used, 64);
509 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
510 used, 64);
511
512 /* struct btrfs_inode_ref */
513 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
514
515 /* struct btrfs_inode_item */
516 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
517 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
518 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
519 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
520 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
521 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
522 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
523 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
524 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
525 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
526 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
527 compat_flags, 16);
528
529 static inline struct btrfs_inode_timespec *
530 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
531 {
532 unsigned long ptr = (unsigned long)inode_item;
533 ptr += offsetof(struct btrfs_inode_item, atime);
534 return (struct btrfs_inode_timespec *)ptr;
535 }
536
537 static inline struct btrfs_inode_timespec *
538 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
539 {
540 unsigned long ptr = (unsigned long)inode_item;
541 ptr += offsetof(struct btrfs_inode_item, mtime);
542 return (struct btrfs_inode_timespec *)ptr;
543 }
544
545 static inline struct btrfs_inode_timespec *
546 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
547 {
548 unsigned long ptr = (unsigned long)inode_item;
549 ptr += offsetof(struct btrfs_inode_item, ctime);
550 return (struct btrfs_inode_timespec *)ptr;
551 }
552
553 static inline struct btrfs_inode_timespec *
554 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
555 {
556 unsigned long ptr = (unsigned long)inode_item;
557 ptr += offsetof(struct btrfs_inode_item, otime);
558 return (struct btrfs_inode_timespec *)ptr;
559 }
560
561 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
562 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
563
564 /* struct btrfs_extent_item */
565 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
566
567 /* struct btrfs_extent_ref */
568 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
569 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
570 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
571 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
572
573 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
574 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
575 generation, 64);
576 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
577 objectid, 64);
578 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
579
580 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
581 refs, 32);
582
583 /* struct btrfs_node */
584 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
585 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
586
587 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
588 {
589 unsigned long ptr;
590 ptr = offsetof(struct btrfs_node, ptrs) +
591 sizeof(struct btrfs_key_ptr) * nr;
592 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
593 }
594
595 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
596 int nr, u64 val)
597 {
598 unsigned long ptr;
599 ptr = offsetof(struct btrfs_node, ptrs) +
600 sizeof(struct btrfs_key_ptr) * nr;
601 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
602 }
603
604 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
605 {
606 unsigned long ptr;
607 ptr = offsetof(struct btrfs_node, ptrs) +
608 sizeof(struct btrfs_key_ptr) * nr;
609 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
610 }
611
612 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
613 int nr, u64 val)
614 {
615 unsigned long ptr;
616 ptr = offsetof(struct btrfs_node, ptrs) +
617 sizeof(struct btrfs_key_ptr) * nr;
618 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
619 }
620
621 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
622 {
623 return offsetof(struct btrfs_node, ptrs) +
624 sizeof(struct btrfs_key_ptr) * nr;
625 }
626
627 void btrfs_node_key(struct extent_buffer *eb,
628 struct btrfs_disk_key *disk_key, int nr);
629
630 static inline void btrfs_set_node_key(struct extent_buffer *eb,
631 struct btrfs_disk_key *disk_key, int nr)
632 {
633 unsigned long ptr;
634 ptr = btrfs_node_key_ptr_offset(nr);
635 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
636 struct btrfs_key_ptr, key, disk_key);
637 }
638
639 /* struct btrfs_item */
640 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
641 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
642
643 static inline unsigned long btrfs_item_nr_offset(int nr)
644 {
645 return offsetof(struct btrfs_leaf, items) +
646 sizeof(struct btrfs_item) * nr;
647 }
648
649 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
650 int nr)
651 {
652 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
653 }
654
655 static inline u32 btrfs_item_end(struct extent_buffer *eb,
656 struct btrfs_item *item)
657 {
658 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
659 }
660
661 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
662 {
663 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
664 }
665
666 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
667 {
668 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
669 }
670
671 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
672 {
673 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
674 }
675
676 static inline void btrfs_item_key(struct extent_buffer *eb,
677 struct btrfs_disk_key *disk_key, int nr)
678 {
679 struct btrfs_item *item = btrfs_item_nr(eb, nr);
680 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
681 }
682
683 static inline void btrfs_set_item_key(struct extent_buffer *eb,
684 struct btrfs_disk_key *disk_key, int nr)
685 {
686 struct btrfs_item *item = btrfs_item_nr(eb, nr);
687 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
688 }
689
690 /* struct btrfs_dir_item */
691 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
692 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
693 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
694
695 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
696 struct btrfs_dir_item *item,
697 struct btrfs_disk_key *key)
698 {
699 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
700 }
701
702 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
703 struct btrfs_dir_item *item,
704 struct btrfs_disk_key *key)
705 {
706 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
707 }
708
709 /* struct btrfs_disk_key */
710 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
711 objectid, 64);
712 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
713 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
714
715 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
716 struct btrfs_disk_key *disk)
717 {
718 cpu->offset = le64_to_cpu(disk->offset);
719 cpu->type = disk->type;
720 cpu->objectid = le64_to_cpu(disk->objectid);
721 }
722
723 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
724 struct btrfs_key *cpu)
725 {
726 disk->offset = cpu_to_le64(cpu->offset);
727 disk->type = cpu->type;
728 disk->objectid = cpu_to_le64(cpu->objectid);
729 }
730
731 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
732 struct btrfs_key *key, int nr)
733 {
734 struct btrfs_disk_key disk_key;
735 btrfs_node_key(eb, &disk_key, nr);
736 btrfs_disk_key_to_cpu(key, &disk_key);
737 }
738
739 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
740 struct btrfs_key *key, int nr)
741 {
742 struct btrfs_disk_key disk_key;
743 btrfs_item_key(eb, &disk_key, nr);
744 btrfs_disk_key_to_cpu(key, &disk_key);
745 }
746
747 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
748 struct btrfs_dir_item *item,
749 struct btrfs_key *key)
750 {
751 struct btrfs_disk_key disk_key;
752 btrfs_dir_item_key(eb, item, &disk_key);
753 btrfs_disk_key_to_cpu(key, &disk_key);
754 }
755
756
757 static inline u8 btrfs_key_type(struct btrfs_key *key)
758 {
759 return key->type;
760 }
761
762 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
763 {
764 key->type = val;
765 }
766
767 /* struct btrfs_header */
768 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
769 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
770 generation, 64);
771 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
772 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
773 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
774 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
775
776 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
777 {
778 unsigned long ptr = offsetof(struct btrfs_header, fsid);
779 return (u8 *)ptr;
780 }
781
782 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
783 {
784 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
785 return (u8 *)ptr;
786 }
787
788 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
789 {
790 unsigned long ptr = offsetof(struct btrfs_header, csum);
791 return (u8 *)ptr;
792 }
793
794 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
795 {
796 return NULL;
797 }
798
799 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
800 {
801 return NULL;
802 }
803
804 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
805 {
806 return NULL;
807 }
808
809 static inline int btrfs_is_leaf(struct extent_buffer *eb)
810 {
811 return (btrfs_header_level(eb) == 0);
812 }
813
814 /* struct btrfs_root_item */
815 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
816 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
817 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
818
819 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
820 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
821 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
822 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
823 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
824 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
825 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
826
827 /* struct btrfs_super_block */
828 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
829 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
830 generation, 64);
831 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
832 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
833 root_level, 8);
834 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
835 total_bytes, 64);
836 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
837 bytes_used, 64);
838 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
839 sectorsize, 32);
840 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
841 nodesize, 32);
842 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
843 leafsize, 32);
844 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
845 stripesize, 32);
846 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
847 root_dir_objectid, 64);
848
849 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
850 {
851 return offsetof(struct btrfs_leaf, items);
852 }
853
854 /* struct btrfs_file_extent_item */
855 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
856
857 static inline unsigned long btrfs_file_extent_inline_start(struct
858 btrfs_file_extent_item *e)
859 {
860 unsigned long offset = (unsigned long)e;
861 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
862 return offset;
863 }
864
865 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
866 {
867 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
868 }
869
870 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
871 struct btrfs_item *e)
872 {
873 unsigned long offset;
874 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
875 return btrfs_item_size(eb, e) - offset;
876 }
877
878 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
879 disk_bytenr, 64);
880 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
881 generation, 64);
882 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
883 disk_num_bytes, 64);
884 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
885 offset, 64);
886 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
887 num_bytes, 64);
888
889 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
890 {
891 return sb->s_fs_info;
892 }
893
894 static inline int btrfs_set_root_name(struct btrfs_root *root,
895 const char *name, int len)
896 {
897 /* if we already have a name just free it */
898 if (root->name)
899 kfree(root->name);
900
901 root->name = kmalloc(len+1, GFP_KERNEL);
902 if (!root->name)
903 return -ENOMEM;
904
905 memcpy(root->name, name, len);
906 root->name[len] ='\0';
907
908 return 0;
909 }
910
911 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
912 if (level == 0)
913 return root->leafsize;
914 return root->nodesize;
915 }
916
917 /* helper function to cast into the data area of the leaf. */
918 #define btrfs_item_ptr(leaf, slot, type) \
919 ((type *)(btrfs_leaf_data(leaf) + \
920 btrfs_item_offset_nr(leaf, slot)))
921
922 #define btrfs_item_ptr_offset(leaf, slot) \
923 ((unsigned long)(btrfs_leaf_data(leaf) + \
924 btrfs_item_offset_nr(leaf, slot)))
925
926 static inline struct dentry *fdentry(struct file *file) {
927 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
928 return file->f_dentry;
929 #else
930 return file->f_path.dentry;
931 #endif
932 }
933
934 /* extent-tree.c */
935 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
936 struct btrfs_path *count_path,
937 u64 first_extent);
938 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
939 struct btrfs_root *root);
940 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
941 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
942 btrfs_fs_info *info,
943 u64 bytenr);
944 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
945 struct btrfs_block_group_cache
946 *hint, u64 search_start,
947 int data, int owner);
948 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
949 struct btrfs_root *root, u64 owner_objectid);
950 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
951 struct btrfs_root *root, u32 size,
952 u64 root_objectid,
953 u64 hint, u64 empty_size);
954 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
955 struct btrfs_root *root,
956 u32 blocksize,
957 u64 root_objectid,
958 u64 ref_generation,
959 u64 first_objectid,
960 int level,
961 u64 hint,
962 u64 empty_size);
963 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
964 struct btrfs_root *root,
965 struct btrfs_path *path, u64 bytenr,
966 u64 root_objectid, u64 ref_generation,
967 u64 owner, u64 owner_offset);
968 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
969 struct btrfs_root *root,
970 u64 num_bytes, u64 root_objectid, u64 ref_generation,
971 u64 owner, u64 owner_offset,
972 u64 empty_size, u64 hint_byte,
973 u64 search_end, struct btrfs_key *ins, int data);
974 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
975 struct extent_buffer *buf);
976 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
977 *root, u64 bytenr, u64 num_bytes,
978 u64 root_objectid, u64 ref_generation,
979 u64 owner_objectid, u64 owner_offset, int pin);
980 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
981 struct btrfs_root *root,
982 struct extent_map_tree *unpin);
983 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
984 struct btrfs_root *root,
985 u64 bytenr, u64 num_bytes,
986 u64 root_objectid, u64 ref_generation,
987 u64 owner, u64 owner_offset);
988 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
989 struct btrfs_root *root);
990 int btrfs_free_block_groups(struct btrfs_fs_info *info);
991 int btrfs_read_block_groups(struct btrfs_root *root);
992 /* ctree.c */
993 int btrfs_cow_block(struct btrfs_trans_handle *trans,
994 struct btrfs_root *root, struct extent_buffer *buf,
995 struct extent_buffer *parent, int parent_slot,
996 struct extent_buffer **cow_ret);
997 int btrfs_copy_root(struct btrfs_trans_handle *trans,
998 struct btrfs_root *root,
999 struct extent_buffer *buf,
1000 struct extent_buffer **cow_ret, u64 new_root_objectid);
1001 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1002 *root, struct btrfs_path *path, u32 data_size);
1003 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1004 struct btrfs_root *root,
1005 struct btrfs_path *path,
1006 u32 new_size, int from_end);
1007 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1008 *root, struct btrfs_key *key, struct btrfs_path *p, int
1009 ins_len, int cow);
1010 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1011 struct btrfs_root *root, struct extent_buffer *parent,
1012 int start_slot, int cache_only, u64 *last_ret,
1013 struct btrfs_key *progress);
1014 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1015 struct btrfs_path *btrfs_alloc_path(void);
1016 void btrfs_free_path(struct btrfs_path *p);
1017 void btrfs_init_path(struct btrfs_path *p);
1018 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1019 struct btrfs_path *path);
1020 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1021 *root, struct btrfs_key *key, void *data, u32 data_size);
1022 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1023 *root, struct btrfs_path *path, struct btrfs_key
1024 *cpu_key, u32 data_size);
1025 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1026 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1027 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1028 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1029 *root);
1030 /* root-item.c */
1031 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1032 struct btrfs_key *key);
1033 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1034 *root, struct btrfs_key *key, struct btrfs_root_item
1035 *item);
1036 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1037 *root, struct btrfs_key *key, struct btrfs_root_item
1038 *item);
1039 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1040 btrfs_root_item *item, struct btrfs_key *key);
1041 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1042 struct btrfs_root *latest_root);
1043 /* dir-item.c */
1044 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1045 *root, const char *name, int name_len, u64 dir,
1046 struct btrfs_key *location, u8 type);
1047 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1048 struct btrfs_root *root,
1049 struct btrfs_path *path, u64 dir,
1050 const char *name, int name_len,
1051 int mod);
1052 struct btrfs_dir_item *
1053 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1054 struct btrfs_root *root,
1055 struct btrfs_path *path, u64 dir,
1056 u64 objectid, const char *name, int name_len,
1057 int mod);
1058 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1059 struct btrfs_path *path,
1060 const char *name, int name_len);
1061 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1062 struct btrfs_root *root,
1063 struct btrfs_path *path,
1064 struct btrfs_dir_item *di);
1065 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1066 struct btrfs_root *root, const char *name,
1067 u16 name_len, const void *data, u16 data_len,
1068 u64 dir);
1069 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1070 struct btrfs_root *root,
1071 struct btrfs_path *path, u64 dir,
1072 const char *name, u16 name_len,
1073 int mod);
1074 /* inode-map.c */
1075 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1076 struct btrfs_root *fs_root,
1077 u64 dirid, u64 *objectid);
1078 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1079
1080 /* inode-item.c */
1081 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1082 struct btrfs_root *root,
1083 const char *name, int name_len,
1084 u64 inode_objectid, u64 ref_objectid);
1085 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1086 struct btrfs_root *root,
1087 const char *name, int name_len,
1088 u64 inode_objectid, u64 ref_objectid);
1089 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1090 struct btrfs_root *root,
1091 struct btrfs_path *path, u64 objectid);
1092 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1093 *root, struct btrfs_path *path,
1094 struct btrfs_key *location, int mod);
1095
1096 /* file-item.c */
1097 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1098 struct btrfs_root *root,
1099 u64 objectid, u64 pos, u64 offset,
1100 u64 disk_num_bytes,
1101 u64 num_bytes);
1102 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1103 struct btrfs_root *root,
1104 struct btrfs_path *path, u64 objectid,
1105 u64 bytenr, int mod);
1106 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1107 struct btrfs_root *root,
1108 struct inode *inode,
1109 u64 objectid, u64 offset,
1110 char *data, size_t len);
1111 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1112 struct btrfs_root *root,
1113 struct btrfs_path *path,
1114 u64 objectid, u64 offset,
1115 int cow);
1116 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1117 struct btrfs_root *root, struct btrfs_path *path,
1118 u64 isize);
1119 /* inode.c */
1120 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1121 int for_del);
1122 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1123 int btrfs_readpage(struct file *file, struct page *page);
1124 void btrfs_delete_inode(struct inode *inode);
1125 void btrfs_read_locked_inode(struct inode *inode);
1126 int btrfs_write_inode(struct inode *inode, int wait);
1127 void btrfs_dirty_inode(struct inode *inode);
1128 struct inode *btrfs_alloc_inode(struct super_block *sb);
1129 void btrfs_destroy_inode(struct inode *inode);
1130 int btrfs_init_cachep(void);
1131 void btrfs_destroy_cachep(void);
1132 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1133 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1134 struct btrfs_root *root);
1135 int btrfs_commit_write(struct file *file, struct page *page,
1136 unsigned from, unsigned to);
1137 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1138 size_t page_offset, u64 start, u64 end,
1139 int create);
1140 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1141 struct btrfs_root *root,
1142 struct inode *inode);
1143 /* file.c */
1144 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1145 extern struct file_operations btrfs_file_operations;
1146 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1147 struct btrfs_root *root, struct inode *inode,
1148 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1149 /* tree-defrag.c */
1150 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1151 struct btrfs_root *root, int cache_only);
1152
1153 /* sysfs.c */
1154 int btrfs_init_sysfs(void);
1155 void btrfs_exit_sysfs(void);
1156 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1157 int btrfs_sysfs_add_root(struct btrfs_root *root);
1158 void btrfs_sysfs_del_root(struct btrfs_root *root);
1159 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1160
1161 /* xattr.c */
1162 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1163 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1164 struct btrfs_root *root, struct inode *inode);
1165 #endif
Linux kernel - Deliverables
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