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Btrfs: Handle data checksumming on bios that span multiple ordered extents
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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_CTREE__
20 #define __BTRFS_CTREE__
21
22 #include <linux/version.h>
23 #include <linux/mm.h>
24 #include <linux/highmem.h>
25 #include <linux/fs.h>
26 #include <linux/completion.h>
27 #include <linux/backing-dev.h>
28 #include <linux/wait.h>
29 #include <asm/kmap_types.h>
30 #include "bit-radix.h"
31 #include "extent_io.h"
32 #include "extent_map.h"
33 #include "async-thread.h"
34
35 struct btrfs_trans_handle;
36 struct btrfs_transaction;
37 extern struct kmem_cache *btrfs_trans_handle_cachep;
38 extern struct kmem_cache *btrfs_transaction_cachep;
39 extern struct kmem_cache *btrfs_bit_radix_cachep;
40 extern struct kmem_cache *btrfs_path_cachep;
41 struct btrfs_ordered_sum;
42
43 #define BTRFS_MAGIC "_B5RfS_M"
44
45 #define BTRFS_MAX_LEVEL 8
46
47 /* holds pointers to all of the tree roots */
48 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
49
50 /* stores information about which extents are in use, and reference counts */
51 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
52
53 /*
54 * chunk tree stores translations from logical -> physical block numbering
55 * the super block points to the chunk tree
56 */
57 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
58
59 /*
60 * stores information about which areas of a given device are in use.
61 * one per device. The tree of tree roots points to the device tree
62 */
63 #define BTRFS_DEV_TREE_OBJECTID 4ULL
64
65 /* one per subvolume, storing files and directories */
66 #define BTRFS_FS_TREE_OBJECTID 5ULL
67
68 /* directory objectid inside the root tree */
69 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
70
71 /*
72 * All files have objectids higher than this.
73 */
74 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
75 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
76
77
78 /*
79 * the device items go into the chunk tree. The key is in the form
80 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
81 */
82 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
83
84 /*
85 * we can actually store much bigger names, but lets not confuse the rest
86 * of linux
87 */
88 #define BTRFS_NAME_LEN 255
89
90 /* 32 bytes in various csum fields */
91 #define BTRFS_CSUM_SIZE 32
92 /* four bytes for CRC32 */
93 #define BTRFS_CRC32_SIZE 4
94 #define BTRFS_EMPTY_DIR_SIZE 0
95
96 #define BTRFS_FT_UNKNOWN 0
97 #define BTRFS_FT_REG_FILE 1
98 #define BTRFS_FT_DIR 2
99 #define BTRFS_FT_CHRDEV 3
100 #define BTRFS_FT_BLKDEV 4
101 #define BTRFS_FT_FIFO 5
102 #define BTRFS_FT_SOCK 6
103 #define BTRFS_FT_SYMLINK 7
104 #define BTRFS_FT_XATTR 8
105 #define BTRFS_FT_MAX 9
106
107 /*
108 * the key defines the order in the tree, and so it also defines (optimal)
109 * block layout. objectid corresonds to the inode number. The flags
110 * tells us things about the object, and is a kind of stream selector.
111 * so for a given inode, keys with flags of 1 might refer to the inode
112 * data, flags of 2 may point to file data in the btree and flags == 3
113 * may point to extents.
114 *
115 * offset is the starting byte offset for this key in the stream.
116 *
117 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
118 * in cpu native order. Otherwise they are identical and their sizes
119 * should be the same (ie both packed)
120 */
121 struct btrfs_disk_key {
122 __le64 objectid;
123 u8 type;
124 __le64 offset;
125 } __attribute__ ((__packed__));
126
127 struct btrfs_key {
128 u64 objectid;
129 u8 type;
130 u64 offset;
131 } __attribute__ ((__packed__));
132
133 struct btrfs_mapping_tree {
134 struct extent_map_tree map_tree;
135 };
136
137 #define BTRFS_UUID_SIZE 16
138 struct btrfs_dev_item {
139 /* the internal btrfs device id */
140 __le64 devid;
141
142 /* size of the device */
143 __le64 total_bytes;
144
145 /* bytes used */
146 __le64 bytes_used;
147
148 /* optimal io alignment for this device */
149 __le32 io_align;
150
151 /* optimal io width for this device */
152 __le32 io_width;
153
154 /* minimal io size for this device */
155 __le32 sector_size;
156
157 /* type and info about this device */
158 __le64 type;
159
160 /* grouping information for allocation decisions */
161 __le32 dev_group;
162
163 /* seek speed 0-100 where 100 is fastest */
164 u8 seek_speed;
165
166 /* bandwidth 0-100 where 100 is fastest */
167 u8 bandwidth;
168
169 /* btrfs generated uuid for this device */
170 u8 uuid[BTRFS_UUID_SIZE];
171 } __attribute__ ((__packed__));
172
173 struct btrfs_stripe {
174 __le64 devid;
175 __le64 offset;
176 u8 dev_uuid[BTRFS_UUID_SIZE];
177 } __attribute__ ((__packed__));
178
179 struct btrfs_chunk {
180 /* size of this chunk in bytes */
181 __le64 length;
182
183 /* objectid of the root referencing this chunk */
184 __le64 owner;
185
186 __le64 stripe_len;
187 __le64 type;
188
189 /* optimal io alignment for this chunk */
190 __le32 io_align;
191
192 /* optimal io width for this chunk */
193 __le32 io_width;
194
195 /* minimal io size for this chunk */
196 __le32 sector_size;
197
198 /* 2^16 stripes is quite a lot, a second limit is the size of a single
199 * item in the btree
200 */
201 __le16 num_stripes;
202
203 /* sub stripes only matter for raid10 */
204 __le16 sub_stripes;
205 struct btrfs_stripe stripe;
206 /* additional stripes go here */
207 } __attribute__ ((__packed__));
208
209 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
210 {
211 BUG_ON(num_stripes == 0);
212 return sizeof(struct btrfs_chunk) +
213 sizeof(struct btrfs_stripe) * (num_stripes - 1);
214 }
215
216 #define BTRFS_FSID_SIZE 16
217 #define BTRFS_HEADER_FLAG_WRITTEN (1 << 0)
218
219 /*
220 * every tree block (leaf or node) starts with this header.
221 */
222 struct btrfs_header {
223 /* these first four must match the super block */
224 u8 csum[BTRFS_CSUM_SIZE];
225 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
226 __le64 bytenr; /* which block this node is supposed to live in */
227 __le64 flags;
228
229 /* allowed to be different from the super from here on down */
230 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
231 __le64 generation;
232 __le64 owner;
233 __le32 nritems;
234 u8 level;
235 } __attribute__ ((__packed__));
236
237 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
238 sizeof(struct btrfs_header)) / \
239 sizeof(struct btrfs_key_ptr))
240 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
241 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
242 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
243 sizeof(struct btrfs_item) - \
244 sizeof(struct btrfs_file_extent_item))
245
246
247 /*
248 * this is a very generous portion of the super block, giving us
249 * room to translate 14 chunks with 3 stripes each.
250 */
251 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
252 #define BTRFS_LABEL_SIZE 256
253
254 /*
255 * the super block basically lists the main trees of the FS
256 * it currently lacks any block count etc etc
257 */
258 struct btrfs_super_block {
259 u8 csum[BTRFS_CSUM_SIZE];
260 /* the first 4 fields must match struct btrfs_header */
261 u8 fsid[16]; /* FS specific uuid */
262 __le64 bytenr; /* this block number */
263 __le64 flags;
264
265 /* allowed to be different from the btrfs_header from here own down */
266 __le64 magic;
267 __le64 generation;
268 __le64 root;
269 __le64 chunk_root;
270 __le64 total_bytes;
271 __le64 bytes_used;
272 __le64 root_dir_objectid;
273 __le64 num_devices;
274 __le32 sectorsize;
275 __le32 nodesize;
276 __le32 leafsize;
277 __le32 stripesize;
278 __le32 sys_chunk_array_size;
279 u8 root_level;
280 u8 chunk_root_level;
281 struct btrfs_dev_item dev_item;
282 char label[BTRFS_LABEL_SIZE];
283 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
284 } __attribute__ ((__packed__));
285
286 /*
287 * A leaf is full of items. offset and size tell us where to find
288 * the item in the leaf (relative to the start of the data area)
289 */
290 struct btrfs_item {
291 struct btrfs_disk_key key;
292 __le32 offset;
293 __le32 size;
294 } __attribute__ ((__packed__));
295
296 /*
297 * leaves have an item area and a data area:
298 * [item0, item1....itemN] [free space] [dataN...data1, data0]
299 *
300 * The data is separate from the items to get the keys closer together
301 * during searches.
302 */
303 struct btrfs_leaf {
304 struct btrfs_header header;
305 struct btrfs_item items[];
306 } __attribute__ ((__packed__));
307
308 /*
309 * all non-leaf blocks are nodes, they hold only keys and pointers to
310 * other blocks
311 */
312 struct btrfs_key_ptr {
313 struct btrfs_disk_key key;
314 __le64 blockptr;
315 __le64 generation;
316 } __attribute__ ((__packed__));
317
318 struct btrfs_node {
319 struct btrfs_header header;
320 struct btrfs_key_ptr ptrs[];
321 } __attribute__ ((__packed__));
322
323 /*
324 * btrfs_paths remember the path taken from the root down to the leaf.
325 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
326 * to any other levels that are present.
327 *
328 * The slots array records the index of the item or block pointer
329 * used while walking the tree.
330 */
331 struct btrfs_path {
332 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
333 int slots[BTRFS_MAX_LEVEL];
334 /* if there is real range locking, this locks field will change */
335 int locks[BTRFS_MAX_LEVEL];
336 int reada;
337 /* keep some upper locks as we walk down */
338 int keep_locks;
339 int skip_locking;
340 int lowest_level;
341 };
342
343 /*
344 * items in the extent btree are used to record the objectid of the
345 * owner of the block and the number of references
346 */
347 struct btrfs_extent_item {
348 __le32 refs;
349 } __attribute__ ((__packed__));
350
351 struct btrfs_extent_ref {
352 __le64 root;
353 __le64 generation;
354 __le64 objectid;
355 __le64 offset;
356 } __attribute__ ((__packed__));
357
358 /* dev extents record free space on individual devices. The owner
359 * field points back to the chunk allocation mapping tree that allocated
360 * the extent. The chunk tree uuid field is a way to double check the owner
361 */
362 struct btrfs_dev_extent {
363 __le64 chunk_tree;
364 __le64 chunk_objectid;
365 __le64 chunk_offset;
366 __le64 length;
367 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
368 } __attribute__ ((__packed__));
369
370 struct btrfs_inode_ref {
371 __le16 name_len;
372 /* name goes here */
373 } __attribute__ ((__packed__));
374
375 struct btrfs_timespec {
376 __le64 sec;
377 __le32 nsec;
378 } __attribute__ ((__packed__));
379
380 /*
381 * there is no padding here on purpose. If you want to extent the inode,
382 * make a new item type
383 */
384 struct btrfs_inode_item {
385 __le64 generation;
386 __le64 size;
387 __le64 nblocks;
388 __le64 block_group;
389 __le32 nlink;
390 __le32 uid;
391 __le32 gid;
392 __le32 mode;
393 __le64 rdev;
394 __le16 flags;
395 __le16 compat_flags;
396 struct btrfs_timespec atime;
397 struct btrfs_timespec ctime;
398 struct btrfs_timespec mtime;
399 struct btrfs_timespec otime;
400 } __attribute__ ((__packed__));
401
402 struct btrfs_dir_item {
403 struct btrfs_disk_key location;
404 __le16 data_len;
405 __le16 name_len;
406 u8 type;
407 } __attribute__ ((__packed__));
408
409 struct btrfs_root_item {
410 struct btrfs_inode_item inode;
411 __le64 root_dirid;
412 __le64 bytenr;
413 __le64 byte_limit;
414 __le64 bytes_used;
415 __le32 flags;
416 __le32 refs;
417 struct btrfs_disk_key drop_progress;
418 u8 drop_level;
419 u8 level;
420 } __attribute__ ((__packed__));
421
422 #define BTRFS_FILE_EXTENT_REG 0
423 #define BTRFS_FILE_EXTENT_INLINE 1
424
425 struct btrfs_file_extent_item {
426 __le64 generation;
427 u8 type;
428 /*
429 * disk space consumed by the extent, checksum blocks are included
430 * in these numbers
431 */
432 __le64 disk_bytenr;
433 __le64 disk_num_bytes;
434 /*
435 * the logical offset in file blocks (no csums)
436 * this extent record is for. This allows a file extent to point
437 * into the middle of an existing extent on disk, sharing it
438 * between two snapshots (useful if some bytes in the middle of the
439 * extent have changed
440 */
441 __le64 offset;
442 /*
443 * the logical number of file blocks (no csums included)
444 */
445 __le64 num_bytes;
446 } __attribute__ ((__packed__));
447
448 struct btrfs_csum_item {
449 u8 csum;
450 } __attribute__ ((__packed__));
451
452 /* different types of block groups (and chunks) */
453 #define BTRFS_BLOCK_GROUP_DATA (1 << 0)
454 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
455 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
456 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
457 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
458 #define BTRFS_BLOCK_GROUP_DUP (1 << 5)
459 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
460
461
462 struct btrfs_block_group_item {
463 __le64 used;
464 __le64 chunk_objectid;
465 __le64 flags;
466 } __attribute__ ((__packed__));
467
468 struct btrfs_space_info {
469 u64 flags;
470 u64 total_bytes;
471 u64 bytes_used;
472 u64 bytes_pinned;
473 int full;
474 int force_alloc;
475 struct list_head list;
476 };
477
478 struct btrfs_block_group_cache {
479 struct btrfs_key key;
480 struct btrfs_block_group_item item;
481 struct btrfs_space_info *space_info;
482 u64 pinned;
483 u64 flags;
484 int cached;
485 int ro;
486 };
487
488 struct btrfs_device;
489 struct btrfs_fs_devices;
490 struct btrfs_fs_info {
491 u8 fsid[BTRFS_FSID_SIZE];
492 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
493 struct btrfs_root *extent_root;
494 struct btrfs_root *tree_root;
495 struct btrfs_root *chunk_root;
496 struct btrfs_root *dev_root;
497 struct radix_tree_root fs_roots_radix;
498
499 struct extent_io_tree free_space_cache;
500 struct extent_io_tree block_group_cache;
501 struct extent_io_tree pinned_extents;
502 struct extent_io_tree pending_del;
503 struct extent_io_tree extent_ins;
504
505 /* logical->physical extent mapping */
506 struct btrfs_mapping_tree mapping_tree;
507
508 u64 generation;
509 u64 last_trans_committed;
510 unsigned long mount_opt;
511 u64 max_extent;
512 u64 max_inline;
513 u64 alloc_start;
514 struct btrfs_transaction *running_transaction;
515 wait_queue_head_t transaction_throttle;
516 wait_queue_head_t transaction_wait;
517 struct btrfs_super_block super_copy;
518 struct btrfs_super_block super_for_commit;
519 struct block_device *__bdev;
520 struct super_block *sb;
521 struct inode *btree_inode;
522 struct backing_dev_info bdi;
523 spinlock_t hash_lock;
524 struct mutex trans_mutex;
525 struct mutex transaction_kthread_mutex;
526 struct mutex cleaner_mutex;
527 struct mutex alloc_mutex;
528 struct mutex chunk_mutex;
529 struct mutex drop_mutex;
530 struct mutex volume_mutex;
531 struct list_head trans_list;
532 struct list_head hashers;
533 struct list_head dead_roots;
534 atomic_t nr_async_submits;
535
536 /*
537 * there is a pool of worker threads for checksumming during writes
538 * and a pool for checksumming after reads. This is because readers
539 * can run with FS locks held, and the writers may be waiting for
540 * those locks. We don't want ordering in the pending list to cause
541 * deadlocks, and so the two are serviced separately.
542 *
543 * A third pool does submit_bio to avoid deadlocking with the other
544 * two
545 */
546 struct btrfs_workers workers;
547 struct btrfs_workers endio_workers;
548 struct btrfs_workers endio_write_workers;
549 struct btrfs_workers submit_workers;
550 /*
551 * fixup workers take dirty pages that didn't properly go through
552 * the cow mechanism and make them safe to write. It happens
553 * for the sys_munmap function call path
554 */
555 struct btrfs_workers fixup_workers;
556 struct task_struct *transaction_kthread;
557 struct task_struct *cleaner_kthread;
558 int thread_pool_size;
559
560 struct kobject super_kobj;
561 struct completion kobj_unregister;
562 int do_barriers;
563 int closing;
564 atomic_t throttles;
565
566 u64 total_pinned;
567 struct list_head dirty_cowonly_roots;
568
569 struct btrfs_fs_devices *fs_devices;
570 struct list_head space_info;
571 spinlock_t delalloc_lock;
572 spinlock_t new_trans_lock;
573 u64 delalloc_bytes;
574 u64 last_alloc;
575 u64 last_data_alloc;
576
577 u64 avail_data_alloc_bits;
578 u64 avail_metadata_alloc_bits;
579 u64 avail_system_alloc_bits;
580 u64 data_alloc_profile;
581 u64 metadata_alloc_profile;
582 u64 system_alloc_profile;
583
584 void *bdev_holder;
585 };
586
587 /*
588 * in ram representation of the tree. extent_root is used for all allocations
589 * and for the extent tree extent_root root.
590 */
591 struct btrfs_root {
592 struct extent_buffer *node;
593
594 /* the node lock is held while changing the node pointer */
595 spinlock_t node_lock;
596
597 struct extent_buffer *commit_root;
598 struct btrfs_root_item root_item;
599 struct btrfs_key root_key;
600 struct btrfs_fs_info *fs_info;
601 struct inode *inode;
602 struct kobject root_kobj;
603 struct completion kobj_unregister;
604 struct mutex objectid_mutex;
605 u64 objectid;
606 u64 last_trans;
607
608 /* data allocations are done in sectorsize units */
609 u32 sectorsize;
610
611 /* node allocations are done in nodesize units */
612 u32 nodesize;
613
614 /* leaf allocations are done in leafsize units */
615 u32 leafsize;
616
617 u32 stripesize;
618
619 u32 type;
620 u64 highest_inode;
621 u64 last_inode_alloc;
622 int ref_cows;
623 int track_dirty;
624 u64 defrag_trans_start;
625 struct btrfs_key defrag_progress;
626 struct btrfs_key defrag_max;
627 int defrag_running;
628 int defrag_level;
629 char *name;
630 int in_sysfs;
631
632 /* the dirty list is only used by non-reference counted roots */
633 struct list_head dirty_list;
634 };
635
636 /*
637
638 * inode items have the data typically returned from stat and store other
639 * info about object characteristics. There is one for every file and dir in
640 * the FS
641 */
642 #define BTRFS_INODE_ITEM_KEY 1
643 #define BTRFS_INODE_REF_KEY 2
644 #define BTRFS_XATTR_ITEM_KEY 8
645 /* reserve 2-15 close to the inode for later flexibility */
646
647 /*
648 * dir items are the name -> inode pointers in a directory. There is one
649 * for every name in a directory.
650 */
651 #define BTRFS_DIR_ITEM_KEY 16
652 #define BTRFS_DIR_INDEX_KEY 17
653 /*
654 * extent data is for file data
655 */
656 #define BTRFS_EXTENT_DATA_KEY 18
657 /*
658 * csum items have the checksums for data in the extents
659 */
660 #define BTRFS_CSUM_ITEM_KEY 19
661
662 /* reserve 20-31 for other file stuff */
663
664 /*
665 * root items point to tree roots. There are typically in the root
666 * tree used by the super block to find all the other trees
667 */
668 #define BTRFS_ROOT_ITEM_KEY 32
669 /*
670 * extent items are in the extent map tree. These record which blocks
671 * are used, and how many references there are to each block
672 */
673 #define BTRFS_EXTENT_ITEM_KEY 33
674 #define BTRFS_EXTENT_REF_KEY 34
675
676 /*
677 * block groups give us hints into the extent allocation trees. Which
678 * blocks are free etc etc
679 */
680 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
681
682 #define BTRFS_DEV_EXTENT_KEY 75
683 #define BTRFS_DEV_ITEM_KEY 76
684 #define BTRFS_CHUNK_ITEM_KEY 77
685
686 /*
687 * string items are for debugging. They just store a short string of
688 * data in the FS
689 */
690 #define BTRFS_STRING_ITEM_KEY 253
691
692 #define BTRFS_MOUNT_NODATASUM (1 << 0)
693 #define BTRFS_MOUNT_NODATACOW (1 << 1)
694 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
695 #define BTRFS_MOUNT_SSD (1 << 3)
696 #define BTRFS_MOUNT_DEGRADED (1 << 4)
697
698 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
699 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
700 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
701 BTRFS_MOUNT_##opt)
702 /*
703 * Inode flags
704 */
705 #define BTRFS_INODE_NODATASUM (1 << 0)
706 #define BTRFS_INODE_NODATACOW (1 << 1)
707 #define BTRFS_INODE_READONLY (1 << 2)
708 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
709 ~BTRFS_INODE_##flag)
710 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
711 BTRFS_INODE_##flag)
712 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
713 BTRFS_INODE_##flag)
714 /* some macros to generate set/get funcs for the struct fields. This
715 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
716 * one for u8:
717 */
718 #define le8_to_cpu(v) (v)
719 #define cpu_to_le8(v) (v)
720 #define __le8 u8
721
722 #define read_eb_member(eb, ptr, type, member, result) ( \
723 read_extent_buffer(eb, (char *)(result), \
724 ((unsigned long)(ptr)) + \
725 offsetof(type, member), \
726 sizeof(((type *)0)->member)))
727
728 #define write_eb_member(eb, ptr, type, member, result) ( \
729 write_extent_buffer(eb, (char *)(result), \
730 ((unsigned long)(ptr)) + \
731 offsetof(type, member), \
732 sizeof(((type *)0)->member)))
733
734 #ifndef BTRFS_SETGET_FUNCS
735 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
736 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
737 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
738 #endif
739
740 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
741 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
742 { \
743 type *p = kmap_atomic(eb->first_page, KM_USER0); \
744 u##bits res = le##bits##_to_cpu(p->member); \
745 kunmap_atomic(p, KM_USER0); \
746 return res; \
747 } \
748 static inline void btrfs_set_##name(struct extent_buffer *eb, \
749 u##bits val) \
750 { \
751 type *p = kmap_atomic(eb->first_page, KM_USER0); \
752 p->member = cpu_to_le##bits(val); \
753 kunmap_atomic(p, KM_USER0); \
754 }
755
756 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
757 static inline u##bits btrfs_##name(type *s) \
758 { \
759 return le##bits##_to_cpu(s->member); \
760 } \
761 static inline void btrfs_set_##name(type *s, u##bits val) \
762 { \
763 s->member = cpu_to_le##bits(val); \
764 }
765
766 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
767 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
768 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
769 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
770 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
771 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
772 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
773 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
774 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
775 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
776
777 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
778 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
779 total_bytes, 64);
780 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
781 bytes_used, 64);
782 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
783 io_align, 32);
784 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
785 io_width, 32);
786 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
787 sector_size, 32);
788 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
789 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
790 dev_group, 32);
791 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
792 seek_speed, 8);
793 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
794 bandwidth, 8);
795
796 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
797 {
798 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
799 }
800
801 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
802 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
803 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
804 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
805 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
806 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
807 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
808 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
809 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
810 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
811 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
812
813 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
814 {
815 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
816 }
817
818 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
819 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
820 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
821 stripe_len, 64);
822 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
823 io_align, 32);
824 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
825 io_width, 32);
826 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
827 sector_size, 32);
828 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
829 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
830 num_stripes, 16);
831 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
832 sub_stripes, 16);
833 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
834 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
835
836 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
837 int nr)
838 {
839 unsigned long offset = (unsigned long)c;
840 offset += offsetof(struct btrfs_chunk, stripe);
841 offset += nr * sizeof(struct btrfs_stripe);
842 return (struct btrfs_stripe *)offset;
843 }
844
845 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
846 {
847 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
848 }
849
850 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
851 struct btrfs_chunk *c, int nr)
852 {
853 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
854 }
855
856 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
857 struct btrfs_chunk *c, int nr,
858 u64 val)
859 {
860 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
861 }
862
863 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
864 struct btrfs_chunk *c, int nr)
865 {
866 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
867 }
868
869 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
870 struct btrfs_chunk *c, int nr,
871 u64 val)
872 {
873 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
874 }
875
876 /* struct btrfs_block_group_item */
877 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
878 used, 64);
879 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
880 used, 64);
881 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
882 struct btrfs_block_group_item, chunk_objectid, 64);
883
884 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
885 struct btrfs_block_group_item, chunk_objectid, 64);
886 BTRFS_SETGET_FUNCS(disk_block_group_flags,
887 struct btrfs_block_group_item, flags, 64);
888 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
889 struct btrfs_block_group_item, flags, 64);
890
891 /* struct btrfs_inode_ref */
892 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
893
894 /* struct btrfs_inode_item */
895 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
896 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
897 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
898 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
899 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
900 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
901 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
902 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
903 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
904 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
905 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
906 compat_flags, 16);
907
908 static inline struct btrfs_timespec *
909 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
910 {
911 unsigned long ptr = (unsigned long)inode_item;
912 ptr += offsetof(struct btrfs_inode_item, atime);
913 return (struct btrfs_timespec *)ptr;
914 }
915
916 static inline struct btrfs_timespec *
917 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
918 {
919 unsigned long ptr = (unsigned long)inode_item;
920 ptr += offsetof(struct btrfs_inode_item, mtime);
921 return (struct btrfs_timespec *)ptr;
922 }
923
924 static inline struct btrfs_timespec *
925 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
926 {
927 unsigned long ptr = (unsigned long)inode_item;
928 ptr += offsetof(struct btrfs_inode_item, ctime);
929 return (struct btrfs_timespec *)ptr;
930 }
931
932 static inline struct btrfs_timespec *
933 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
934 {
935 unsigned long ptr = (unsigned long)inode_item;
936 ptr += offsetof(struct btrfs_inode_item, otime);
937 return (struct btrfs_timespec *)ptr;
938 }
939
940 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
941 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
942
943 /* struct btrfs_extent_item */
944 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
945
946 /* struct btrfs_dev_extent */
947 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
948 chunk_tree, 64);
949 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
950 chunk_objectid, 64);
951 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
952 chunk_offset, 64);
953 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
954
955 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
956 {
957 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
958 return (u8 *)((unsigned long)dev + ptr);
959 }
960
961 /* struct btrfs_extent_ref */
962 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
963 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
964 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
965 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
966
967 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
968 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
969 generation, 64);
970 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
971 objectid, 64);
972 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
973
974 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
975 refs, 32);
976
977 /* struct btrfs_node */
978 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
979 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
980
981 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
982 {
983 unsigned long ptr;
984 ptr = offsetof(struct btrfs_node, ptrs) +
985 sizeof(struct btrfs_key_ptr) * nr;
986 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
987 }
988
989 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
990 int nr, u64 val)
991 {
992 unsigned long ptr;
993 ptr = offsetof(struct btrfs_node, ptrs) +
994 sizeof(struct btrfs_key_ptr) * nr;
995 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
996 }
997
998 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
999 {
1000 unsigned long ptr;
1001 ptr = offsetof(struct btrfs_node, ptrs) +
1002 sizeof(struct btrfs_key_ptr) * nr;
1003 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1004 }
1005
1006 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1007 int nr, u64 val)
1008 {
1009 unsigned long ptr;
1010 ptr = offsetof(struct btrfs_node, ptrs) +
1011 sizeof(struct btrfs_key_ptr) * nr;
1012 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1013 }
1014
1015 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1016 {
1017 return offsetof(struct btrfs_node, ptrs) +
1018 sizeof(struct btrfs_key_ptr) * nr;
1019 }
1020
1021 void btrfs_node_key(struct extent_buffer *eb,
1022 struct btrfs_disk_key *disk_key, int nr);
1023
1024 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1025 struct btrfs_disk_key *disk_key, int nr)
1026 {
1027 unsigned long ptr;
1028 ptr = btrfs_node_key_ptr_offset(nr);
1029 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1030 struct btrfs_key_ptr, key, disk_key);
1031 }
1032
1033 /* struct btrfs_item */
1034 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1035 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1036
1037 static inline unsigned long btrfs_item_nr_offset(int nr)
1038 {
1039 return offsetof(struct btrfs_leaf, items) +
1040 sizeof(struct btrfs_item) * nr;
1041 }
1042
1043 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1044 int nr)
1045 {
1046 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1047 }
1048
1049 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1050 struct btrfs_item *item)
1051 {
1052 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1053 }
1054
1055 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1056 {
1057 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1058 }
1059
1060 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1061 {
1062 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1063 }
1064
1065 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1066 {
1067 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1068 }
1069
1070 static inline void btrfs_item_key(struct extent_buffer *eb,
1071 struct btrfs_disk_key *disk_key, int nr)
1072 {
1073 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1074 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1075 }
1076
1077 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1078 struct btrfs_disk_key *disk_key, int nr)
1079 {
1080 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1081 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1082 }
1083
1084 /* struct btrfs_dir_item */
1085 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1086 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1087 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1088
1089 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1090 struct btrfs_dir_item *item,
1091 struct btrfs_disk_key *key)
1092 {
1093 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1094 }
1095
1096 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1097 struct btrfs_dir_item *item,
1098 struct btrfs_disk_key *key)
1099 {
1100 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1101 }
1102
1103 /* struct btrfs_disk_key */
1104 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1105 objectid, 64);
1106 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1107 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1108
1109 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1110 struct btrfs_disk_key *disk)
1111 {
1112 cpu->offset = le64_to_cpu(disk->offset);
1113 cpu->type = disk->type;
1114 cpu->objectid = le64_to_cpu(disk->objectid);
1115 }
1116
1117 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1118 struct btrfs_key *cpu)
1119 {
1120 disk->offset = cpu_to_le64(cpu->offset);
1121 disk->type = cpu->type;
1122 disk->objectid = cpu_to_le64(cpu->objectid);
1123 }
1124
1125 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1126 struct btrfs_key *key, int nr)
1127 {
1128 struct btrfs_disk_key disk_key;
1129 btrfs_node_key(eb, &disk_key, nr);
1130 btrfs_disk_key_to_cpu(key, &disk_key);
1131 }
1132
1133 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1134 struct btrfs_key *key, int nr)
1135 {
1136 struct btrfs_disk_key disk_key;
1137 btrfs_item_key(eb, &disk_key, nr);
1138 btrfs_disk_key_to_cpu(key, &disk_key);
1139 }
1140
1141 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1142 struct btrfs_dir_item *item,
1143 struct btrfs_key *key)
1144 {
1145 struct btrfs_disk_key disk_key;
1146 btrfs_dir_item_key(eb, item, &disk_key);
1147 btrfs_disk_key_to_cpu(key, &disk_key);
1148 }
1149
1150
1151 static inline u8 btrfs_key_type(struct btrfs_key *key)
1152 {
1153 return key->type;
1154 }
1155
1156 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1157 {
1158 key->type = val;
1159 }
1160
1161 /* struct btrfs_header */
1162 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1163 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1164 generation, 64);
1165 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1166 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1167 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1168 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1169
1170 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1171 {
1172 return (btrfs_header_flags(eb) & flag) == flag;
1173 }
1174
1175 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1176 {
1177 u64 flags = btrfs_header_flags(eb);
1178 btrfs_set_header_flags(eb, flags | flag);
1179 return (flags & flag) == flag;
1180 }
1181
1182 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1183 {
1184 u64 flags = btrfs_header_flags(eb);
1185 btrfs_set_header_flags(eb, flags & ~flag);
1186 return (flags & flag) == flag;
1187 }
1188
1189 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1190 {
1191 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1192 return (u8 *)ptr;
1193 }
1194
1195 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1196 {
1197 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1198 return (u8 *)ptr;
1199 }
1200
1201 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1202 {
1203 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1204 return (u8 *)ptr;
1205 }
1206
1207 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1208 {
1209 unsigned long ptr = offsetof(struct btrfs_header, csum);
1210 return (u8 *)ptr;
1211 }
1212
1213 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1214 {
1215 return NULL;
1216 }
1217
1218 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1219 {
1220 return NULL;
1221 }
1222
1223 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1224 {
1225 return NULL;
1226 }
1227
1228 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1229 {
1230 return (btrfs_header_level(eb) == 0);
1231 }
1232
1233 /* struct btrfs_root_item */
1234 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1235 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1236 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1237
1238 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1239 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1240 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1241 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1242 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
1243 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1244 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1245
1246 /* struct btrfs_super_block */
1247 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1248 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1249 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1250 generation, 64);
1251 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1252 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1253 struct btrfs_super_block, sys_chunk_array_size, 32);
1254 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1255 root_level, 8);
1256 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1257 chunk_root, 64);
1258 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1259 chunk_root_level, 64);
1260 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1261 total_bytes, 64);
1262 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1263 bytes_used, 64);
1264 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1265 sectorsize, 32);
1266 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1267 nodesize, 32);
1268 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1269 leafsize, 32);
1270 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1271 stripesize, 32);
1272 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1273 root_dir_objectid, 64);
1274 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1275 num_devices, 64);
1276
1277 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1278 {
1279 return offsetof(struct btrfs_leaf, items);
1280 }
1281
1282 /* struct btrfs_file_extent_item */
1283 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1284
1285 static inline unsigned long btrfs_file_extent_inline_start(struct
1286 btrfs_file_extent_item *e)
1287 {
1288 unsigned long offset = (unsigned long)e;
1289 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1290 return offset;
1291 }
1292
1293 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1294 {
1295 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1296 }
1297
1298 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1299 struct btrfs_item *e)
1300 {
1301 unsigned long offset;
1302 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1303 return btrfs_item_size(eb, e) - offset;
1304 }
1305
1306 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1307 disk_bytenr, 64);
1308 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1309 generation, 64);
1310 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1311 disk_num_bytes, 64);
1312 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1313 offset, 64);
1314 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1315 num_bytes, 64);
1316
1317 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1318 {
1319 return sb->s_fs_info;
1320 }
1321
1322 static inline int btrfs_set_root_name(struct btrfs_root *root,
1323 const char *name, int len)
1324 {
1325 /* if we already have a name just free it */
1326 if (root->name)
1327 kfree(root->name);
1328
1329 root->name = kmalloc(len+1, GFP_KERNEL);
1330 if (!root->name)
1331 return -ENOMEM;
1332
1333 memcpy(root->name, name, len);
1334 root->name[len] ='\0';
1335
1336 return 0;
1337 }
1338
1339 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1340 if (level == 0)
1341 return root->leafsize;
1342 return root->nodesize;
1343 }
1344
1345 /* helper function to cast into the data area of the leaf. */
1346 #define btrfs_item_ptr(leaf, slot, type) \
1347 ((type *)(btrfs_leaf_data(leaf) + \
1348 btrfs_item_offset_nr(leaf, slot)))
1349
1350 #define btrfs_item_ptr_offset(leaf, slot) \
1351 ((unsigned long)(btrfs_leaf_data(leaf) + \
1352 btrfs_item_offset_nr(leaf, slot)))
1353
1354 static inline struct dentry *fdentry(struct file *file) {
1355 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1356 return file->f_dentry;
1357 #else
1358 return file->f_path.dentry;
1359 #endif
1360 }
1361
1362 /* extent-tree.c */
1363 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
1364 struct btrfs_path *count_path,
1365 u64 expected_owner, u64 first_extent);
1366 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1367 struct btrfs_root *root);
1368 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1369 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1370 btrfs_fs_info *info,
1371 u64 bytenr);
1372 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1373 struct btrfs_block_group_cache
1374 *hint, u64 search_start,
1375 int data, int owner);
1376 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1377 struct btrfs_root *root,
1378 u32 blocksize,
1379 u64 root_objectid,
1380 u64 ref_generation,
1381 u64 first_objectid,
1382 int level,
1383 u64 hint,
1384 u64 empty_size);
1385 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
1386 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
1387 struct btrfs_root *root,
1388 struct btrfs_path *path, u64 bytenr,
1389 u64 root_objectid, u64 ref_generation,
1390 u64 owner, u64 owner_offset);
1391 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1392 struct btrfs_root *root,
1393 u64 num_bytes, u64 min_bytes,
1394 u64 root_objectid, u64 ref_generation,
1395 u64 owner, u64 owner_offset,
1396 u64 empty_size, u64 hint_byte,
1397 u64 search_end, struct btrfs_key *ins, u64 data);
1398 int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
1399 struct btrfs_root *root,
1400 u64 root_objectid, u64 ref_generation,
1401 u64 owner, u64 owner_offset,
1402 struct btrfs_key *ins);
1403 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
1404 struct btrfs_root *root,
1405 u64 num_bytes, u64 min_alloc_size,
1406 u64 empty_size, u64 hint_byte,
1407 u64 search_end, struct btrfs_key *ins,
1408 u64 data);
1409 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1410 struct extent_buffer *buf);
1411 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1412 *root, u64 bytenr, u64 num_bytes,
1413 u64 root_objectid, u64 ref_generation,
1414 u64 owner_objectid, u64 owner_offset, int pin);
1415 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1416 struct btrfs_root *root,
1417 struct extent_io_tree *unpin);
1418 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1419 struct btrfs_root *root,
1420 u64 bytenr, u64 num_bytes,
1421 u64 root_objectid, u64 ref_generation,
1422 u64 owner, u64 owner_offset);
1423 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1424 struct btrfs_root *root);
1425 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1426 int btrfs_read_block_groups(struct btrfs_root *root);
1427 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
1428 struct btrfs_root *root, u64 bytes_used,
1429 u64 type, u64 chunk_objectid, u64 chunk_offset,
1430 u64 size);
1431 /* ctree.c */
1432 int btrfs_previous_item(struct btrfs_root *root,
1433 struct btrfs_path *path, u64 min_objectid,
1434 int type);
1435
1436 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
1437 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
1438 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
1439 struct btrfs_key *key, int lowest_level,
1440 int cache_only, u64 min_trans);
1441 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
1442 struct btrfs_path *path, int cache_only,
1443 u64 min_trans);
1444
1445 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1446 struct btrfs_root *root, struct extent_buffer *buf,
1447 struct extent_buffer *parent, int parent_slot,
1448 struct extent_buffer **cow_ret);
1449 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1450 struct btrfs_root *root,
1451 struct extent_buffer *buf,
1452 struct extent_buffer **cow_ret, u64 new_root_objectid);
1453 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1454 *root, struct btrfs_path *path, u32 data_size);
1455 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1456 struct btrfs_root *root,
1457 struct btrfs_path *path,
1458 u32 new_size, int from_end);
1459 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1460 *root, struct btrfs_key *key, struct btrfs_path *p, int
1461 ins_len, int cow);
1462 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1463 struct btrfs_root *root, struct extent_buffer *parent,
1464 int start_slot, int cache_only, u64 *last_ret,
1465 struct btrfs_key *progress);
1466 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1467 struct btrfs_path *btrfs_alloc_path(void);
1468 void btrfs_free_path(struct btrfs_path *p);
1469 void btrfs_init_path(struct btrfs_path *p);
1470 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1471 struct btrfs_path *path, int slot, int nr);
1472
1473 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1474 struct btrfs_root *root,
1475 struct btrfs_path *path)
1476 {
1477 return btrfs_del_items(trans, root, path, path->slots[0], 1);
1478 }
1479
1480 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1481 *root, struct btrfs_key *key, void *data, u32 data_size);
1482 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1483 struct btrfs_root *root,
1484 struct btrfs_path *path,
1485 struct btrfs_key *cpu_key, u32 *data_size, int nr);
1486
1487 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1488 struct btrfs_root *root,
1489 struct btrfs_path *path,
1490 struct btrfs_key *key,
1491 u32 data_size)
1492 {
1493 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1494 }
1495
1496 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1497 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1498 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1499 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1500 *root);
1501 /* root-item.c */
1502 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1503 struct btrfs_key *key);
1504 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1505 *root, struct btrfs_key *key, struct btrfs_root_item
1506 *item);
1507 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1508 *root, struct btrfs_key *key, struct btrfs_root_item
1509 *item);
1510 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1511 btrfs_root_item *item, struct btrfs_key *key);
1512 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
1513 u64 *found_objectid);
1514 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1515 struct btrfs_root *latest_root);
1516 /* dir-item.c */
1517 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1518 *root, const char *name, int name_len, u64 dir,
1519 struct btrfs_key *location, u8 type);
1520 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1521 struct btrfs_root *root,
1522 struct btrfs_path *path, u64 dir,
1523 const char *name, int name_len,
1524 int mod);
1525 struct btrfs_dir_item *
1526 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1527 struct btrfs_root *root,
1528 struct btrfs_path *path, u64 dir,
1529 u64 objectid, const char *name, int name_len,
1530 int mod);
1531 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1532 struct btrfs_path *path,
1533 const char *name, int name_len);
1534 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1535 struct btrfs_root *root,
1536 struct btrfs_path *path,
1537 struct btrfs_dir_item *di);
1538 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1539 struct btrfs_root *root, const char *name,
1540 u16 name_len, const void *data, u16 data_len,
1541 u64 dir);
1542 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1543 struct btrfs_root *root,
1544 struct btrfs_path *path, u64 dir,
1545 const char *name, u16 name_len,
1546 int mod);
1547 /* inode-map.c */
1548 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1549 struct btrfs_root *fs_root,
1550 u64 dirid, u64 *objectid);
1551 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1552
1553 /* inode-item.c */
1554 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1555 struct btrfs_root *root,
1556 const char *name, int name_len,
1557 u64 inode_objectid, u64 ref_objectid);
1558 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1559 struct btrfs_root *root,
1560 const char *name, int name_len,
1561 u64 inode_objectid, u64 ref_objectid);
1562 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1563 struct btrfs_root *root,
1564 struct btrfs_path *path, u64 objectid);
1565 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1566 *root, struct btrfs_path *path,
1567 struct btrfs_key *location, int mod);
1568
1569 /* file-item.c */
1570 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1571 struct btrfs_root *root,
1572 u64 objectid, u64 pos, u64 disk_offset,
1573 u64 disk_num_bytes,
1574 u64 num_bytes, u64 offset);
1575 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1576 struct btrfs_root *root,
1577 struct btrfs_path *path, u64 objectid,
1578 u64 bytenr, int mod);
1579 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
1580 struct btrfs_root *root, struct inode *inode,
1581 struct btrfs_ordered_sum *sums);
1582 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
1583 struct bio *bio);
1584 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1585 struct btrfs_root *root,
1586 struct btrfs_path *path,
1587 u64 objectid, u64 offset,
1588 int cow);
1589 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1590 struct btrfs_root *root, struct btrfs_path *path,
1591 u64 isize);
1592 /* inode.c */
1593 int btrfs_create_subvol_root(struct btrfs_root *new_root,
1594 struct btrfs_trans_handle *trans, u64 new_dirid,
1595 struct btrfs_block_group_cache *block_group);
1596
1597 void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name,
1598 int namelen);
1599
1600 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
1601 size_t size, struct bio *bio);
1602
1603 static inline void dec_i_blocks(struct inode *inode, u64 dec)
1604 {
1605 dec = dec >> 9;
1606 if (dec <= inode->i_blocks)
1607 inode->i_blocks -= dec;
1608 else
1609 inode->i_blocks = 0;
1610 }
1611
1612 unsigned long btrfs_force_ra(struct address_space *mapping,
1613 struct file_ra_state *ra, struct file *file,
1614 pgoff_t offset, pgoff_t last_index);
1615 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1616 int for_del);
1617 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1618 int btrfs_readpage(struct file *file, struct page *page);
1619 void btrfs_delete_inode(struct inode *inode);
1620 void btrfs_put_inode(struct inode *inode);
1621 void btrfs_read_locked_inode(struct inode *inode);
1622 int btrfs_write_inode(struct inode *inode, int wait);
1623 void btrfs_dirty_inode(struct inode *inode);
1624 struct inode *btrfs_alloc_inode(struct super_block *sb);
1625 void btrfs_destroy_inode(struct inode *inode);
1626 int btrfs_init_cachep(void);
1627 void btrfs_destroy_cachep(void);
1628 long btrfs_ioctl_trans_end(struct file *file);
1629 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1630 struct btrfs_root *root);
1631 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1632 u64 root_objectid);
1633 int btrfs_commit_write(struct file *file, struct page *page,
1634 unsigned from, unsigned to);
1635 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1636 size_t page_offset, u64 start, u64 end,
1637 int create);
1638 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1639 struct btrfs_root *root,
1640 struct inode *inode);
1641
1642 /* ioctl.c */
1643 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1644
1645 /* file.c */
1646 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1647 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
1648 extern struct file_operations btrfs_file_operations;
1649 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1650 struct btrfs_root *root, struct inode *inode,
1651 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1652 int btrfs_release_file(struct inode *inode, struct file *file);
1653
1654 /* tree-defrag.c */
1655 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1656 struct btrfs_root *root, int cache_only);
1657
1658 /* sysfs.c */
1659 int btrfs_init_sysfs(void);
1660 void btrfs_exit_sysfs(void);
1661 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1662 int btrfs_sysfs_add_root(struct btrfs_root *root);
1663 void btrfs_sysfs_del_root(struct btrfs_root *root);
1664 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1665
1666 /* xattr.c */
1667 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1668 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1669 struct btrfs_root *root, struct inode *inode);
1670 /* super.c */
1671 u64 btrfs_parse_size(char *str);
1672 int btrfs_parse_options(struct btrfs_root *root, char *options);
1673 int btrfs_sync_fs(struct super_block *sb, int wait);
1674 #endif