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