xref: /openbmc/linux/fs/btrfs/ctree.h (revision b04b4f78)
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 "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 struct btrfs_ordered_sum;
41 
42 #define BTRFS_MAGIC "_BHRfS_M"
43 
44 #define BTRFS_ACL_NOT_CACHED    ((void *)-1)
45 
46 #define BTRFS_MAX_LEVEL 8
47 
48 /*
49  * files bigger than this get some pre-flushing when they are added
50  * to the ordered operations list.  That way we limit the total
51  * work done by the commit
52  */
53 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
54 
55 /* holds pointers to all of the tree roots */
56 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
57 
58 /* stores information about which extents are in use, and reference counts */
59 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
60 
61 /*
62  * chunk tree stores translations from logical -> physical block numbering
63  * the super block points to the chunk tree
64  */
65 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
66 
67 /*
68  * stores information about which areas of a given device are in use.
69  * one per device.  The tree of tree roots points to the device tree
70  */
71 #define BTRFS_DEV_TREE_OBJECTID 4ULL
72 
73 /* one per subvolume, storing files and directories */
74 #define BTRFS_FS_TREE_OBJECTID 5ULL
75 
76 /* directory objectid inside the root tree */
77 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
78 
79 /* holds checksums of all the data extents */
80 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
81 
82 /* orhpan objectid for tracking unlinked/truncated files */
83 #define BTRFS_ORPHAN_OBJECTID -5ULL
84 
85 /* does write ahead logging to speed up fsyncs */
86 #define BTRFS_TREE_LOG_OBJECTID -6ULL
87 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
88 
89 /* for space balancing */
90 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
91 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
92 
93 /*
94  * extent checksums all have this objectid
95  * this allows them to share the logging tree
96  * for fsyncs
97  */
98 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
99 
100 /* dummy objectid represents multiple objectids */
101 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
102 
103 /*
104  * All files have objectids in this range.
105  */
106 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
107 #define BTRFS_LAST_FREE_OBJECTID -256ULL
108 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
109 
110 
111 /*
112  * the device items go into the chunk tree.  The key is in the form
113  * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
114  */
115 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
116 
117 /*
118  * we can actually store much bigger names, but lets not confuse the rest
119  * of linux
120  */
121 #define BTRFS_NAME_LEN 255
122 
123 /* 32 bytes in various csum fields */
124 #define BTRFS_CSUM_SIZE 32
125 
126 /* csum types */
127 #define BTRFS_CSUM_TYPE_CRC32	0
128 
129 static int btrfs_csum_sizes[] = { 4, 0 };
130 
131 /* four bytes for CRC32 */
132 #define BTRFS_EMPTY_DIR_SIZE 0
133 
134 #define BTRFS_FT_UNKNOWN	0
135 #define BTRFS_FT_REG_FILE	1
136 #define BTRFS_FT_DIR		2
137 #define BTRFS_FT_CHRDEV		3
138 #define BTRFS_FT_BLKDEV		4
139 #define BTRFS_FT_FIFO		5
140 #define BTRFS_FT_SOCK		6
141 #define BTRFS_FT_SYMLINK	7
142 #define BTRFS_FT_XATTR		8
143 #define BTRFS_FT_MAX		9
144 
145 /*
146  * The key defines the order in the tree, and so it also defines (optimal)
147  * block layout.
148  *
149  * objectid corresponds to the inode number.
150  *
151  * type tells us things about the object, and is a kind of stream selector.
152  * so for a given inode, keys with type of 1 might refer to the inode data,
153  * type of 2 may point to file data in the btree and type == 3 may point to
154  * extents.
155  *
156  * offset is the starting byte offset for this key in the stream.
157  *
158  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
159  * in cpu native order.  Otherwise they are identical and their sizes
160  * should be the same (ie both packed)
161  */
162 struct btrfs_disk_key {
163 	__le64 objectid;
164 	u8 type;
165 	__le64 offset;
166 } __attribute__ ((__packed__));
167 
168 struct btrfs_key {
169 	u64 objectid;
170 	u8 type;
171 	u64 offset;
172 } __attribute__ ((__packed__));
173 
174 struct btrfs_mapping_tree {
175 	struct extent_map_tree map_tree;
176 };
177 
178 #define BTRFS_UUID_SIZE 16
179 struct btrfs_dev_item {
180 	/* the internal btrfs device id */
181 	__le64 devid;
182 
183 	/* size of the device */
184 	__le64 total_bytes;
185 
186 	/* bytes used */
187 	__le64 bytes_used;
188 
189 	/* optimal io alignment for this device */
190 	__le32 io_align;
191 
192 	/* optimal io width for this device */
193 	__le32 io_width;
194 
195 	/* minimal io size for this device */
196 	__le32 sector_size;
197 
198 	/* type and info about this device */
199 	__le64 type;
200 
201 	/* expected generation for this device */
202 	__le64 generation;
203 
204 	/*
205 	 * starting byte of this partition on the device,
206 	 * to allow for stripe alignment in the future
207 	 */
208 	__le64 start_offset;
209 
210 	/* grouping information for allocation decisions */
211 	__le32 dev_group;
212 
213 	/* seek speed 0-100 where 100 is fastest */
214 	u8 seek_speed;
215 
216 	/* bandwidth 0-100 where 100 is fastest */
217 	u8 bandwidth;
218 
219 	/* btrfs generated uuid for this device */
220 	u8 uuid[BTRFS_UUID_SIZE];
221 
222 	/* uuid of FS who owns this device */
223 	u8 fsid[BTRFS_UUID_SIZE];
224 } __attribute__ ((__packed__));
225 
226 struct btrfs_stripe {
227 	__le64 devid;
228 	__le64 offset;
229 	u8 dev_uuid[BTRFS_UUID_SIZE];
230 } __attribute__ ((__packed__));
231 
232 struct btrfs_chunk {
233 	/* size of this chunk in bytes */
234 	__le64 length;
235 
236 	/* objectid of the root referencing this chunk */
237 	__le64 owner;
238 
239 	__le64 stripe_len;
240 	__le64 type;
241 
242 	/* optimal io alignment for this chunk */
243 	__le32 io_align;
244 
245 	/* optimal io width for this chunk */
246 	__le32 io_width;
247 
248 	/* minimal io size for this chunk */
249 	__le32 sector_size;
250 
251 	/* 2^16 stripes is quite a lot, a second limit is the size of a single
252 	 * item in the btree
253 	 */
254 	__le16 num_stripes;
255 
256 	/* sub stripes only matter for raid10 */
257 	__le16 sub_stripes;
258 	struct btrfs_stripe stripe;
259 	/* additional stripes go here */
260 } __attribute__ ((__packed__));
261 
262 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
263 {
264 	BUG_ON(num_stripes == 0);
265 	return sizeof(struct btrfs_chunk) +
266 		sizeof(struct btrfs_stripe) * (num_stripes - 1);
267 }
268 
269 #define BTRFS_FSID_SIZE 16
270 #define BTRFS_HEADER_FLAG_WRITTEN (1 << 0)
271 
272 /*
273  * every tree block (leaf or node) starts with this header.
274  */
275 struct btrfs_header {
276 	/* these first four must match the super block */
277 	u8 csum[BTRFS_CSUM_SIZE];
278 	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
279 	__le64 bytenr; /* which block this node is supposed to live in */
280 	__le64 flags;
281 
282 	/* allowed to be different from the super from here on down */
283 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
284 	__le64 generation;
285 	__le64 owner;
286 	__le32 nritems;
287 	u8 level;
288 } __attribute__ ((__packed__));
289 
290 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
291 				      sizeof(struct btrfs_header)) / \
292 				     sizeof(struct btrfs_key_ptr))
293 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
294 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
295 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
296 					sizeof(struct btrfs_item) - \
297 					sizeof(struct btrfs_file_extent_item))
298 
299 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
300 
301 /*
302  * this is a very generous portion of the super block, giving us
303  * room to translate 14 chunks with 3 stripes each.
304  */
305 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
306 #define BTRFS_LABEL_SIZE 256
307 
308 /*
309  * the super block basically lists the main trees of the FS
310  * it currently lacks any block count etc etc
311  */
312 struct btrfs_super_block {
313 	u8 csum[BTRFS_CSUM_SIZE];
314 	/* the first 4 fields must match struct btrfs_header */
315 	u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
316 	__le64 bytenr; /* this block number */
317 	__le64 flags;
318 
319 	/* allowed to be different from the btrfs_header from here own down */
320 	__le64 magic;
321 	__le64 generation;
322 	__le64 root;
323 	__le64 chunk_root;
324 	__le64 log_root;
325 
326 	/* this will help find the new super based on the log root */
327 	__le64 log_root_transid;
328 	__le64 total_bytes;
329 	__le64 bytes_used;
330 	__le64 root_dir_objectid;
331 	__le64 num_devices;
332 	__le32 sectorsize;
333 	__le32 nodesize;
334 	__le32 leafsize;
335 	__le32 stripesize;
336 	__le32 sys_chunk_array_size;
337 	__le64 chunk_root_generation;
338 	__le64 compat_flags;
339 	__le64 compat_ro_flags;
340 	__le64 incompat_flags;
341 	__le16 csum_type;
342 	u8 root_level;
343 	u8 chunk_root_level;
344 	u8 log_root_level;
345 	struct btrfs_dev_item dev_item;
346 
347 	char label[BTRFS_LABEL_SIZE];
348 
349 	/* future expansion */
350 	__le64 reserved[32];
351 	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
352 } __attribute__ ((__packed__));
353 
354 /*
355  * Compat flags that we support.  If any incompat flags are set other than the
356  * ones specified below then we will fail to mount
357  */
358 #define BTRFS_FEATURE_COMPAT_SUPP	0x0
359 #define BTRFS_FEATURE_COMPAT_RO_SUPP	0x0
360 #define BTRFS_FEATURE_INCOMPAT_SUPP	0x0
361 
362 /*
363  * A leaf is full of items. offset and size tell us where to find
364  * the item in the leaf (relative to the start of the data area)
365  */
366 struct btrfs_item {
367 	struct btrfs_disk_key key;
368 	__le32 offset;
369 	__le32 size;
370 } __attribute__ ((__packed__));
371 
372 /*
373  * leaves have an item area and a data area:
374  * [item0, item1....itemN] [free space] [dataN...data1, data0]
375  *
376  * The data is separate from the items to get the keys closer together
377  * during searches.
378  */
379 struct btrfs_leaf {
380 	struct btrfs_header header;
381 	struct btrfs_item items[];
382 } __attribute__ ((__packed__));
383 
384 /*
385  * all non-leaf blocks are nodes, they hold only keys and pointers to
386  * other blocks
387  */
388 struct btrfs_key_ptr {
389 	struct btrfs_disk_key key;
390 	__le64 blockptr;
391 	__le64 generation;
392 } __attribute__ ((__packed__));
393 
394 struct btrfs_node {
395 	struct btrfs_header header;
396 	struct btrfs_key_ptr ptrs[];
397 } __attribute__ ((__packed__));
398 
399 /*
400  * btrfs_paths remember the path taken from the root down to the leaf.
401  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
402  * to any other levels that are present.
403  *
404  * The slots array records the index of the item or block pointer
405  * used while walking the tree.
406  */
407 struct btrfs_path {
408 	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
409 	int slots[BTRFS_MAX_LEVEL];
410 	/* if there is real range locking, this locks field will change */
411 	int locks[BTRFS_MAX_LEVEL];
412 	int reada;
413 	/* keep some upper locks as we walk down */
414 	int lowest_level;
415 
416 	/*
417 	 * set by btrfs_split_item, tells search_slot to keep all locks
418 	 * and to force calls to keep space in the nodes
419 	 */
420 	unsigned int search_for_split:1;
421 	unsigned int keep_locks:1;
422 	unsigned int skip_locking:1;
423 	unsigned int leave_spinning:1;
424 };
425 
426 /*
427  * items in the extent btree are used to record the objectid of the
428  * owner of the block and the number of references
429  */
430 struct btrfs_extent_item {
431 	__le32 refs;
432 } __attribute__ ((__packed__));
433 
434 struct btrfs_extent_ref {
435 	__le64 root;
436 	__le64 generation;
437 	__le64 objectid;
438 	__le32 num_refs;
439 } __attribute__ ((__packed__));
440 
441 /* dev extents record free space on individual devices.  The owner
442  * field points back to the chunk allocation mapping tree that allocated
443  * the extent.  The chunk tree uuid field is a way to double check the owner
444  */
445 struct btrfs_dev_extent {
446 	__le64 chunk_tree;
447 	__le64 chunk_objectid;
448 	__le64 chunk_offset;
449 	__le64 length;
450 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
451 } __attribute__ ((__packed__));
452 
453 struct btrfs_inode_ref {
454 	__le64 index;
455 	__le16 name_len;
456 	/* name goes here */
457 } __attribute__ ((__packed__));
458 
459 struct btrfs_timespec {
460 	__le64 sec;
461 	__le32 nsec;
462 } __attribute__ ((__packed__));
463 
464 enum btrfs_compression_type {
465 	BTRFS_COMPRESS_NONE = 0,
466 	BTRFS_COMPRESS_ZLIB = 1,
467 	BTRFS_COMPRESS_LAST = 2,
468 };
469 
470 struct btrfs_inode_item {
471 	/* nfs style generation number */
472 	__le64 generation;
473 	/* transid that last touched this inode */
474 	__le64 transid;
475 	__le64 size;
476 	__le64 nbytes;
477 	__le64 block_group;
478 	__le32 nlink;
479 	__le32 uid;
480 	__le32 gid;
481 	__le32 mode;
482 	__le64 rdev;
483 	__le64 flags;
484 
485 	/* modification sequence number for NFS */
486 	__le64 sequence;
487 
488 	/*
489 	 * a little future expansion, for more than this we can
490 	 * just grow the inode item and version it
491 	 */
492 	__le64 reserved[4];
493 	struct btrfs_timespec atime;
494 	struct btrfs_timespec ctime;
495 	struct btrfs_timespec mtime;
496 	struct btrfs_timespec otime;
497 } __attribute__ ((__packed__));
498 
499 struct btrfs_dir_log_item {
500 	__le64 end;
501 } __attribute__ ((__packed__));
502 
503 struct btrfs_dir_item {
504 	struct btrfs_disk_key location;
505 	__le64 transid;
506 	__le16 data_len;
507 	__le16 name_len;
508 	u8 type;
509 } __attribute__ ((__packed__));
510 
511 struct btrfs_root_item {
512 	struct btrfs_inode_item inode;
513 	__le64 generation;
514 	__le64 root_dirid;
515 	__le64 bytenr;
516 	__le64 byte_limit;
517 	__le64 bytes_used;
518 	__le64 last_snapshot;
519 	__le64 flags;
520 	__le32 refs;
521 	struct btrfs_disk_key drop_progress;
522 	u8 drop_level;
523 	u8 level;
524 } __attribute__ ((__packed__));
525 
526 /*
527  * this is used for both forward and backward root refs
528  */
529 struct btrfs_root_ref {
530 	__le64 dirid;
531 	__le64 sequence;
532 	__le16 name_len;
533 } __attribute__ ((__packed__));
534 
535 #define BTRFS_FILE_EXTENT_INLINE 0
536 #define BTRFS_FILE_EXTENT_REG 1
537 #define BTRFS_FILE_EXTENT_PREALLOC 2
538 
539 struct btrfs_file_extent_item {
540 	/*
541 	 * transaction id that created this extent
542 	 */
543 	__le64 generation;
544 	/*
545 	 * max number of bytes to hold this extent in ram
546 	 * when we split a compressed extent we can't know how big
547 	 * each of the resulting pieces will be.  So, this is
548 	 * an upper limit on the size of the extent in ram instead of
549 	 * an exact limit.
550 	 */
551 	__le64 ram_bytes;
552 
553 	/*
554 	 * 32 bits for the various ways we might encode the data,
555 	 * including compression and encryption.  If any of these
556 	 * are set to something a given disk format doesn't understand
557 	 * it is treated like an incompat flag for reading and writing,
558 	 * but not for stat.
559 	 */
560 	u8 compression;
561 	u8 encryption;
562 	__le16 other_encoding; /* spare for later use */
563 
564 	/* are we inline data or a real extent? */
565 	u8 type;
566 
567 	/*
568 	 * disk space consumed by the extent, checksum blocks are included
569 	 * in these numbers
570 	 */
571 	__le64 disk_bytenr;
572 	__le64 disk_num_bytes;
573 	/*
574 	 * the logical offset in file blocks (no csums)
575 	 * this extent record is for.  This allows a file extent to point
576 	 * into the middle of an existing extent on disk, sharing it
577 	 * between two snapshots (useful if some bytes in the middle of the
578 	 * extent have changed
579 	 */
580 	__le64 offset;
581 	/*
582 	 * the logical number of file blocks (no csums included).  This
583 	 * always reflects the size uncompressed and without encoding.
584 	 */
585 	__le64 num_bytes;
586 
587 } __attribute__ ((__packed__));
588 
589 struct btrfs_csum_item {
590 	u8 csum;
591 } __attribute__ ((__packed__));
592 
593 /* different types of block groups (and chunks) */
594 #define BTRFS_BLOCK_GROUP_DATA     (1 << 0)
595 #define BTRFS_BLOCK_GROUP_SYSTEM   (1 << 1)
596 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
597 #define BTRFS_BLOCK_GROUP_RAID0    (1 << 3)
598 #define BTRFS_BLOCK_GROUP_RAID1    (1 << 4)
599 #define BTRFS_BLOCK_GROUP_DUP	   (1 << 5)
600 #define BTRFS_BLOCK_GROUP_RAID10   (1 << 6)
601 
602 struct btrfs_block_group_item {
603 	__le64 used;
604 	__le64 chunk_objectid;
605 	__le64 flags;
606 } __attribute__ ((__packed__));
607 
608 struct btrfs_space_info {
609 	u64 flags;
610 
611 	u64 total_bytes;	/* total bytes in the space */
612 	u64 bytes_used;		/* total bytes used on disk */
613 	u64 bytes_pinned;	/* total bytes pinned, will be freed when the
614 				   transaction finishes */
615 	u64 bytes_reserved;	/* total bytes the allocator has reserved for
616 				   current allocations */
617 	u64 bytes_readonly;	/* total bytes that are read only */
618 
619 	/* delalloc accounting */
620 	u64 bytes_delalloc;	/* number of bytes reserved for allocation,
621 				   this space is not necessarily reserved yet
622 				   by the allocator */
623 	u64 bytes_may_use;	/* number of bytes that may be used for
624 				   delalloc */
625 
626 	int full;		/* indicates that we cannot allocate any more
627 				   chunks for this space */
628 	int force_alloc;	/* set if we need to force a chunk alloc for
629 				   this space */
630 
631 	struct list_head list;
632 
633 	/* for block groups in our same type */
634 	struct list_head block_groups;
635 	spinlock_t lock;
636 	struct rw_semaphore groups_sem;
637 };
638 
639 /*
640  * free clusters are used to claim free space in relatively large chunks,
641  * allowing us to do less seeky writes.  They are used for all metadata
642  * allocations and data allocations in ssd mode.
643  */
644 struct btrfs_free_cluster {
645 	spinlock_t lock;
646 	spinlock_t refill_lock;
647 	struct rb_root root;
648 
649 	/* largest extent in this cluster */
650 	u64 max_size;
651 
652 	/* first extent starting offset */
653 	u64 window_start;
654 
655 	struct btrfs_block_group_cache *block_group;
656 	/*
657 	 * when a cluster is allocated from a block group, we put the
658 	 * cluster onto a list in the block group so that it can
659 	 * be freed before the block group is freed.
660 	 */
661 	struct list_head block_group_list;
662 };
663 
664 struct btrfs_block_group_cache {
665 	struct btrfs_key key;
666 	struct btrfs_block_group_item item;
667 	spinlock_t lock;
668 	struct mutex cache_mutex;
669 	u64 pinned;
670 	u64 reserved;
671 	u64 flags;
672 	int cached;
673 	int ro;
674 	int dirty;
675 
676 	struct btrfs_space_info *space_info;
677 
678 	/* free space cache stuff */
679 	spinlock_t tree_lock;
680 	struct rb_root free_space_bytes;
681 	struct rb_root free_space_offset;
682 
683 	/* block group cache stuff */
684 	struct rb_node cache_node;
685 
686 	/* for block groups in the same raid type */
687 	struct list_head list;
688 
689 	/* usage count */
690 	atomic_t count;
691 
692 	/* List of struct btrfs_free_clusters for this block group.
693 	 * Today it will only have one thing on it, but that may change
694 	 */
695 	struct list_head cluster_list;
696 };
697 
698 struct btrfs_leaf_ref_tree {
699 	struct rb_root root;
700 	struct list_head list;
701 	spinlock_t lock;
702 };
703 
704 struct btrfs_device;
705 struct btrfs_fs_devices;
706 struct btrfs_fs_info {
707 	u8 fsid[BTRFS_FSID_SIZE];
708 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
709 	struct btrfs_root *extent_root;
710 	struct btrfs_root *tree_root;
711 	struct btrfs_root *chunk_root;
712 	struct btrfs_root *dev_root;
713 	struct btrfs_root *fs_root;
714 	struct btrfs_root *csum_root;
715 
716 	/* the log root tree is a directory of all the other log roots */
717 	struct btrfs_root *log_root_tree;
718 	struct radix_tree_root fs_roots_radix;
719 
720 	/* block group cache stuff */
721 	spinlock_t block_group_cache_lock;
722 	struct rb_root block_group_cache_tree;
723 
724 	struct extent_io_tree pinned_extents;
725 
726 	/* logical->physical extent mapping */
727 	struct btrfs_mapping_tree mapping_tree;
728 
729 	u64 generation;
730 	u64 last_trans_committed;
731 
732 	/*
733 	 * this is updated to the current trans every time a full commit
734 	 * is required instead of the faster short fsync log commits
735 	 */
736 	u64 last_trans_log_full_commit;
737 	u64 open_ioctl_trans;
738 	unsigned long mount_opt;
739 	u64 max_extent;
740 	u64 max_inline;
741 	u64 alloc_start;
742 	struct btrfs_transaction *running_transaction;
743 	wait_queue_head_t transaction_throttle;
744 	wait_queue_head_t transaction_wait;
745 	wait_queue_head_t async_submit_wait;
746 
747 	struct btrfs_super_block super_copy;
748 	struct btrfs_super_block super_for_commit;
749 	struct block_device *__bdev;
750 	struct super_block *sb;
751 	struct inode *btree_inode;
752 	struct backing_dev_info bdi;
753 	struct mutex trans_mutex;
754 	struct mutex tree_log_mutex;
755 	struct mutex transaction_kthread_mutex;
756 	struct mutex cleaner_mutex;
757 	struct mutex chunk_mutex;
758 	struct mutex drop_mutex;
759 	struct mutex volume_mutex;
760 	struct mutex tree_reloc_mutex;
761 
762 	/*
763 	 * this protects the ordered operations list only while we are
764 	 * processing all of the entries on it.  This way we make
765 	 * sure the commit code doesn't find the list temporarily empty
766 	 * because another function happens to be doing non-waiting preflush
767 	 * before jumping into the main commit.
768 	 */
769 	struct mutex ordered_operations_mutex;
770 
771 	struct list_head trans_list;
772 	struct list_head hashers;
773 	struct list_head dead_roots;
774 
775 	atomic_t nr_async_submits;
776 	atomic_t async_submit_draining;
777 	atomic_t nr_async_bios;
778 	atomic_t async_delalloc_pages;
779 
780 	/*
781 	 * this is used by the balancing code to wait for all the pending
782 	 * ordered extents
783 	 */
784 	spinlock_t ordered_extent_lock;
785 
786 	/*
787 	 * all of the data=ordered extents pending writeback
788 	 * these can span multiple transactions and basically include
789 	 * every dirty data page that isn't from nodatacow
790 	 */
791 	struct list_head ordered_extents;
792 
793 	/*
794 	 * all of the inodes that have delalloc bytes.  It is possible for
795 	 * this list to be empty even when there is still dirty data=ordered
796 	 * extents waiting to finish IO.
797 	 */
798 	struct list_head delalloc_inodes;
799 
800 	/*
801 	 * special rename and truncate targets that must be on disk before
802 	 * we're allowed to commit.  This is basically the ext3 style
803 	 * data=ordered list.
804 	 */
805 	struct list_head ordered_operations;
806 
807 	/*
808 	 * there is a pool of worker threads for checksumming during writes
809 	 * and a pool for checksumming after reads.  This is because readers
810 	 * can run with FS locks held, and the writers may be waiting for
811 	 * those locks.  We don't want ordering in the pending list to cause
812 	 * deadlocks, and so the two are serviced separately.
813 	 *
814 	 * A third pool does submit_bio to avoid deadlocking with the other
815 	 * two
816 	 */
817 	struct btrfs_workers workers;
818 	struct btrfs_workers delalloc_workers;
819 	struct btrfs_workers endio_workers;
820 	struct btrfs_workers endio_meta_workers;
821 	struct btrfs_workers endio_meta_write_workers;
822 	struct btrfs_workers endio_write_workers;
823 	struct btrfs_workers submit_workers;
824 	/*
825 	 * fixup workers take dirty pages that didn't properly go through
826 	 * the cow mechanism and make them safe to write.  It happens
827 	 * for the sys_munmap function call path
828 	 */
829 	struct btrfs_workers fixup_workers;
830 	struct task_struct *transaction_kthread;
831 	struct task_struct *cleaner_kthread;
832 	int thread_pool_size;
833 
834 	/* tree relocation relocated fields */
835 	struct list_head dead_reloc_roots;
836 	struct btrfs_leaf_ref_tree reloc_ref_tree;
837 	struct btrfs_leaf_ref_tree shared_ref_tree;
838 
839 	struct kobject super_kobj;
840 	struct completion kobj_unregister;
841 	int do_barriers;
842 	int closing;
843 	int log_root_recovering;
844 	atomic_t throttles;
845 	atomic_t throttle_gen;
846 
847 	u64 total_pinned;
848 
849 	/* protected by the delalloc lock, used to keep from writing
850 	 * metadata until there is a nice batch
851 	 */
852 	u64 dirty_metadata_bytes;
853 	struct list_head dirty_cowonly_roots;
854 
855 	struct btrfs_fs_devices *fs_devices;
856 
857 	/*
858 	 * the space_info list is almost entirely read only.  It only changes
859 	 * when we add a new raid type to the FS, and that happens
860 	 * very rarely.  RCU is used to protect it.
861 	 */
862 	struct list_head space_info;
863 
864 	spinlock_t delalloc_lock;
865 	spinlock_t new_trans_lock;
866 	u64 delalloc_bytes;
867 
868 	/* data_alloc_cluster is only used in ssd mode */
869 	struct btrfs_free_cluster data_alloc_cluster;
870 
871 	/* all metadata allocations go through this cluster */
872 	struct btrfs_free_cluster meta_alloc_cluster;
873 
874 	spinlock_t ref_cache_lock;
875 	u64 total_ref_cache_size;
876 
877 	u64 avail_data_alloc_bits;
878 	u64 avail_metadata_alloc_bits;
879 	u64 avail_system_alloc_bits;
880 	u64 data_alloc_profile;
881 	u64 metadata_alloc_profile;
882 	u64 system_alloc_profile;
883 
884 	unsigned data_chunk_allocations;
885 	unsigned metadata_ratio;
886 
887 	void *bdev_holder;
888 };
889 
890 /*
891  * in ram representation of the tree.  extent_root is used for all allocations
892  * and for the extent tree extent_root root.
893  */
894 struct btrfs_dirty_root;
895 struct btrfs_root {
896 	struct extent_buffer *node;
897 
898 	/* the node lock is held while changing the node pointer */
899 	spinlock_t node_lock;
900 
901 	struct extent_buffer *commit_root;
902 	struct btrfs_leaf_ref_tree *ref_tree;
903 	struct btrfs_leaf_ref_tree ref_tree_struct;
904 	struct btrfs_dirty_root *dirty_root;
905 	struct btrfs_root *log_root;
906 	struct btrfs_root *reloc_root;
907 
908 	struct btrfs_root_item root_item;
909 	struct btrfs_key root_key;
910 	struct btrfs_fs_info *fs_info;
911 	struct extent_io_tree dirty_log_pages;
912 
913 	struct kobject root_kobj;
914 	struct completion kobj_unregister;
915 	struct mutex objectid_mutex;
916 
917 	struct mutex log_mutex;
918 	wait_queue_head_t log_writer_wait;
919 	wait_queue_head_t log_commit_wait[2];
920 	atomic_t log_writers;
921 	atomic_t log_commit[2];
922 	unsigned long log_transid;
923 	unsigned long log_batch;
924 
925 	u64 objectid;
926 	u64 last_trans;
927 
928 	/* data allocations are done in sectorsize units */
929 	u32 sectorsize;
930 
931 	/* node allocations are done in nodesize units */
932 	u32 nodesize;
933 
934 	/* leaf allocations are done in leafsize units */
935 	u32 leafsize;
936 
937 	u32 stripesize;
938 
939 	u32 type;
940 	u64 highest_inode;
941 	u64 last_inode_alloc;
942 	int ref_cows;
943 	int track_dirty;
944 	u64 defrag_trans_start;
945 	struct btrfs_key defrag_progress;
946 	struct btrfs_key defrag_max;
947 	int defrag_running;
948 	int defrag_level;
949 	char *name;
950 	int in_sysfs;
951 
952 	/* the dirty list is only used by non-reference counted roots */
953 	struct list_head dirty_list;
954 
955 	spinlock_t list_lock;
956 	struct list_head dead_list;
957 	struct list_head orphan_list;
958 
959 	/*
960 	 * right now this just gets used so that a root has its own devid
961 	 * for stat.  It may be used for more later
962 	 */
963 	struct super_block anon_super;
964 };
965 
966 /*
967  * inode items have the data typically returned from stat and store other
968  * info about object characteristics.  There is one for every file and dir in
969  * the FS
970  */
971 #define BTRFS_INODE_ITEM_KEY		1
972 #define BTRFS_INODE_REF_KEY		12
973 #define BTRFS_XATTR_ITEM_KEY		24
974 #define BTRFS_ORPHAN_ITEM_KEY		48
975 /* reserve 2-15 close to the inode for later flexibility */
976 
977 /*
978  * dir items are the name -> inode pointers in a directory.  There is one
979  * for every name in a directory.
980  */
981 #define BTRFS_DIR_LOG_ITEM_KEY  60
982 #define BTRFS_DIR_LOG_INDEX_KEY 72
983 #define BTRFS_DIR_ITEM_KEY	84
984 #define BTRFS_DIR_INDEX_KEY	96
985 /*
986  * extent data is for file data
987  */
988 #define BTRFS_EXTENT_DATA_KEY	108
989 
990 /*
991  * extent csums are stored in a separate tree and hold csums for
992  * an entire extent on disk.
993  */
994 #define BTRFS_EXTENT_CSUM_KEY	128
995 
996 /*
997  * root items point to tree roots.  They are typically in the root
998  * tree used by the super block to find all the other trees
999  */
1000 #define BTRFS_ROOT_ITEM_KEY	132
1001 
1002 /*
1003  * root backrefs tie subvols and snapshots to the directory entries that
1004  * reference them
1005  */
1006 #define BTRFS_ROOT_BACKREF_KEY	144
1007 
1008 /*
1009  * root refs make a fast index for listing all of the snapshots and
1010  * subvolumes referenced by a given root.  They point directly to the
1011  * directory item in the root that references the subvol
1012  */
1013 #define BTRFS_ROOT_REF_KEY	156
1014 
1015 /*
1016  * extent items are in the extent map tree.  These record which blocks
1017  * are used, and how many references there are to each block
1018  */
1019 #define BTRFS_EXTENT_ITEM_KEY	168
1020 #define BTRFS_EXTENT_REF_KEY	180
1021 
1022 /*
1023  * block groups give us hints into the extent allocation trees.  Which
1024  * blocks are free etc etc
1025  */
1026 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1027 
1028 #define BTRFS_DEV_EXTENT_KEY	204
1029 #define BTRFS_DEV_ITEM_KEY	216
1030 #define BTRFS_CHUNK_ITEM_KEY	228
1031 
1032 /*
1033  * string items are for debugging.  They just store a short string of
1034  * data in the FS
1035  */
1036 #define BTRFS_STRING_ITEM_KEY	253
1037 
1038 #define BTRFS_MOUNT_NODATASUM		(1 << 0)
1039 #define BTRFS_MOUNT_NODATACOW		(1 << 1)
1040 #define BTRFS_MOUNT_NOBARRIER		(1 << 2)
1041 #define BTRFS_MOUNT_SSD			(1 << 3)
1042 #define BTRFS_MOUNT_DEGRADED		(1 << 4)
1043 #define BTRFS_MOUNT_COMPRESS		(1 << 5)
1044 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1045 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1046 
1047 #define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
1048 #define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
1049 #define btrfs_test_opt(root, opt)	((root)->fs_info->mount_opt & \
1050 					 BTRFS_MOUNT_##opt)
1051 /*
1052  * Inode flags
1053  */
1054 #define BTRFS_INODE_NODATASUM		(1 << 0)
1055 #define BTRFS_INODE_NODATACOW		(1 << 1)
1056 #define BTRFS_INODE_READONLY		(1 << 2)
1057 #define BTRFS_INODE_NOCOMPRESS		(1 << 3)
1058 #define BTRFS_INODE_PREALLOC		(1 << 4)
1059 #define btrfs_clear_flag(inode, flag)	(BTRFS_I(inode)->flags &= \
1060 					 ~BTRFS_INODE_##flag)
1061 #define btrfs_set_flag(inode, flag)	(BTRFS_I(inode)->flags |= \
1062 					 BTRFS_INODE_##flag)
1063 #define btrfs_test_flag(inode, flag)	(BTRFS_I(inode)->flags & \
1064 					 BTRFS_INODE_##flag)
1065 /* some macros to generate set/get funcs for the struct fields.  This
1066  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1067  * one for u8:
1068  */
1069 #define le8_to_cpu(v) (v)
1070 #define cpu_to_le8(v) (v)
1071 #define __le8 u8
1072 
1073 #define read_eb_member(eb, ptr, type, member, result) (			\
1074 	read_extent_buffer(eb, (char *)(result),			\
1075 			   ((unsigned long)(ptr)) +			\
1076 			    offsetof(type, member),			\
1077 			   sizeof(((type *)0)->member)))
1078 
1079 #define write_eb_member(eb, ptr, type, member, result) (		\
1080 	write_extent_buffer(eb, (char *)(result),			\
1081 			   ((unsigned long)(ptr)) +			\
1082 			    offsetof(type, member),			\
1083 			   sizeof(((type *)0)->member)))
1084 
1085 #ifndef BTRFS_SETGET_FUNCS
1086 #define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
1087 u##bits btrfs_##name(struct extent_buffer *eb, type *s);		\
1088 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1089 #endif
1090 
1091 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
1092 static inline u##bits btrfs_##name(struct extent_buffer *eb)		\
1093 {									\
1094 	type *p = kmap_atomic(eb->first_page, KM_USER0);		\
1095 	u##bits res = le##bits##_to_cpu(p->member);			\
1096 	kunmap_atomic(p, KM_USER0);					\
1097 	return res;							\
1098 }									\
1099 static inline void btrfs_set_##name(struct extent_buffer *eb,		\
1100 				    u##bits val)			\
1101 {									\
1102 	type *p = kmap_atomic(eb->first_page, KM_USER0);		\
1103 	p->member = cpu_to_le##bits(val);				\
1104 	kunmap_atomic(p, KM_USER0);					\
1105 }
1106 
1107 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
1108 static inline u##bits btrfs_##name(type *s)				\
1109 {									\
1110 	return le##bits##_to_cpu(s->member);				\
1111 }									\
1112 static inline void btrfs_set_##name(type *s, u##bits val)		\
1113 {									\
1114 	s->member = cpu_to_le##bits(val);				\
1115 }
1116 
1117 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1118 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1119 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1120 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1121 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1122 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1123 		   start_offset, 64);
1124 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1125 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1126 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1127 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1128 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1129 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1130 
1131 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1132 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1133 			 total_bytes, 64);
1134 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1135 			 bytes_used, 64);
1136 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1137 			 io_align, 32);
1138 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1139 			 io_width, 32);
1140 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1141 			 sector_size, 32);
1142 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1143 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1144 			 dev_group, 32);
1145 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1146 			 seek_speed, 8);
1147 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1148 			 bandwidth, 8);
1149 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1150 			 generation, 64);
1151 
1152 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1153 {
1154 	return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1155 }
1156 
1157 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1158 {
1159 	return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1160 }
1161 
1162 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1163 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1164 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1165 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1166 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1167 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1168 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1169 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1170 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1171 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1172 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1173 
1174 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1175 {
1176 	return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1177 }
1178 
1179 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1180 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1181 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1182 			 stripe_len, 64);
1183 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1184 			 io_align, 32);
1185 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1186 			 io_width, 32);
1187 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1188 			 sector_size, 32);
1189 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1190 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1191 			 num_stripes, 16);
1192 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1193 			 sub_stripes, 16);
1194 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1195 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1196 
1197 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1198 						   int nr)
1199 {
1200 	unsigned long offset = (unsigned long)c;
1201 	offset += offsetof(struct btrfs_chunk, stripe);
1202 	offset += nr * sizeof(struct btrfs_stripe);
1203 	return (struct btrfs_stripe *)offset;
1204 }
1205 
1206 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1207 {
1208 	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1209 }
1210 
1211 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1212 					 struct btrfs_chunk *c, int nr)
1213 {
1214 	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1215 }
1216 
1217 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1218 					     struct btrfs_chunk *c, int nr,
1219 					     u64 val)
1220 {
1221 	btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1222 }
1223 
1224 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1225 					 struct btrfs_chunk *c, int nr)
1226 {
1227 	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1228 }
1229 
1230 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1231 					     struct btrfs_chunk *c, int nr,
1232 					     u64 val)
1233 {
1234 	btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1235 }
1236 
1237 /* struct btrfs_block_group_item */
1238 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1239 			 used, 64);
1240 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1241 			 used, 64);
1242 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1243 			struct btrfs_block_group_item, chunk_objectid, 64);
1244 
1245 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1246 		   struct btrfs_block_group_item, chunk_objectid, 64);
1247 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1248 		   struct btrfs_block_group_item, flags, 64);
1249 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1250 			struct btrfs_block_group_item, flags, 64);
1251 
1252 /* struct btrfs_inode_ref */
1253 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1254 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1255 
1256 /* struct btrfs_inode_item */
1257 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1258 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1259 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1260 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1261 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1262 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1263 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1264 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1265 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1266 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1267 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1268 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1269 
1270 static inline struct btrfs_timespec *
1271 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1272 {
1273 	unsigned long ptr = (unsigned long)inode_item;
1274 	ptr += offsetof(struct btrfs_inode_item, atime);
1275 	return (struct btrfs_timespec *)ptr;
1276 }
1277 
1278 static inline struct btrfs_timespec *
1279 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1280 {
1281 	unsigned long ptr = (unsigned long)inode_item;
1282 	ptr += offsetof(struct btrfs_inode_item, mtime);
1283 	return (struct btrfs_timespec *)ptr;
1284 }
1285 
1286 static inline struct btrfs_timespec *
1287 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1288 {
1289 	unsigned long ptr = (unsigned long)inode_item;
1290 	ptr += offsetof(struct btrfs_inode_item, ctime);
1291 	return (struct btrfs_timespec *)ptr;
1292 }
1293 
1294 static inline struct btrfs_timespec *
1295 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1296 {
1297 	unsigned long ptr = (unsigned long)inode_item;
1298 	ptr += offsetof(struct btrfs_inode_item, otime);
1299 	return (struct btrfs_timespec *)ptr;
1300 }
1301 
1302 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1303 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1304 
1305 /* struct btrfs_dev_extent */
1306 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1307 		   chunk_tree, 64);
1308 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1309 		   chunk_objectid, 64);
1310 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1311 		   chunk_offset, 64);
1312 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1313 
1314 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1315 {
1316 	unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1317 	return (u8 *)((unsigned long)dev + ptr);
1318 }
1319 
1320 /* struct btrfs_extent_ref */
1321 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
1322 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
1323 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
1324 BTRFS_SETGET_FUNCS(ref_num_refs, struct btrfs_extent_ref, num_refs, 32);
1325 
1326 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
1327 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
1328 			 generation, 64);
1329 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
1330 			 objectid, 64);
1331 BTRFS_SETGET_STACK_FUNCS(stack_ref_num_refs, struct btrfs_extent_ref,
1332 			 num_refs, 32);
1333 
1334 /* struct btrfs_extent_item */
1335 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
1336 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
1337 			 refs, 32);
1338 
1339 /* struct btrfs_node */
1340 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1341 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1342 
1343 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1344 {
1345 	unsigned long ptr;
1346 	ptr = offsetof(struct btrfs_node, ptrs) +
1347 		sizeof(struct btrfs_key_ptr) * nr;
1348 	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1349 }
1350 
1351 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1352 					   int nr, u64 val)
1353 {
1354 	unsigned long ptr;
1355 	ptr = offsetof(struct btrfs_node, ptrs) +
1356 		sizeof(struct btrfs_key_ptr) * nr;
1357 	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1358 }
1359 
1360 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1361 {
1362 	unsigned long ptr;
1363 	ptr = offsetof(struct btrfs_node, ptrs) +
1364 		sizeof(struct btrfs_key_ptr) * nr;
1365 	return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1366 }
1367 
1368 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1369 						 int nr, u64 val)
1370 {
1371 	unsigned long ptr;
1372 	ptr = offsetof(struct btrfs_node, ptrs) +
1373 		sizeof(struct btrfs_key_ptr) * nr;
1374 	btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1375 }
1376 
1377 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1378 {
1379 	return offsetof(struct btrfs_node, ptrs) +
1380 		sizeof(struct btrfs_key_ptr) * nr;
1381 }
1382 
1383 void btrfs_node_key(struct extent_buffer *eb,
1384 		    struct btrfs_disk_key *disk_key, int nr);
1385 
1386 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1387 				      struct btrfs_disk_key *disk_key, int nr)
1388 {
1389 	unsigned long ptr;
1390 	ptr = btrfs_node_key_ptr_offset(nr);
1391 	write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1392 		       struct btrfs_key_ptr, key, disk_key);
1393 }
1394 
1395 /* struct btrfs_item */
1396 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1397 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1398 
1399 static inline unsigned long btrfs_item_nr_offset(int nr)
1400 {
1401 	return offsetof(struct btrfs_leaf, items) +
1402 		sizeof(struct btrfs_item) * nr;
1403 }
1404 
1405 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1406 					       int nr)
1407 {
1408 	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1409 }
1410 
1411 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1412 				 struct btrfs_item *item)
1413 {
1414 	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1415 }
1416 
1417 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1418 {
1419 	return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1420 }
1421 
1422 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1423 {
1424 	return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1425 }
1426 
1427 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1428 {
1429 	return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1430 }
1431 
1432 static inline void btrfs_item_key(struct extent_buffer *eb,
1433 			   struct btrfs_disk_key *disk_key, int nr)
1434 {
1435 	struct btrfs_item *item = btrfs_item_nr(eb, nr);
1436 	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1437 }
1438 
1439 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1440 			       struct btrfs_disk_key *disk_key, int nr)
1441 {
1442 	struct btrfs_item *item = btrfs_item_nr(eb, nr);
1443 	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1444 }
1445 
1446 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1447 
1448 /*
1449  * struct btrfs_root_ref
1450  */
1451 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1452 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1453 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1454 
1455 /* struct btrfs_dir_item */
1456 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1457 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1458 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1459 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1460 
1461 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1462 				      struct btrfs_dir_item *item,
1463 				      struct btrfs_disk_key *key)
1464 {
1465 	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1466 }
1467 
1468 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1469 					  struct btrfs_dir_item *item,
1470 					  struct btrfs_disk_key *key)
1471 {
1472 	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1473 }
1474 
1475 /* struct btrfs_disk_key */
1476 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1477 			 objectid, 64);
1478 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1479 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1480 
1481 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1482 					 struct btrfs_disk_key *disk)
1483 {
1484 	cpu->offset = le64_to_cpu(disk->offset);
1485 	cpu->type = disk->type;
1486 	cpu->objectid = le64_to_cpu(disk->objectid);
1487 }
1488 
1489 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1490 					 struct btrfs_key *cpu)
1491 {
1492 	disk->offset = cpu_to_le64(cpu->offset);
1493 	disk->type = cpu->type;
1494 	disk->objectid = cpu_to_le64(cpu->objectid);
1495 }
1496 
1497 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1498 				  struct btrfs_key *key, int nr)
1499 {
1500 	struct btrfs_disk_key disk_key;
1501 	btrfs_node_key(eb, &disk_key, nr);
1502 	btrfs_disk_key_to_cpu(key, &disk_key);
1503 }
1504 
1505 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1506 				  struct btrfs_key *key, int nr)
1507 {
1508 	struct btrfs_disk_key disk_key;
1509 	btrfs_item_key(eb, &disk_key, nr);
1510 	btrfs_disk_key_to_cpu(key, &disk_key);
1511 }
1512 
1513 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1514 				      struct btrfs_dir_item *item,
1515 				      struct btrfs_key *key)
1516 {
1517 	struct btrfs_disk_key disk_key;
1518 	btrfs_dir_item_key(eb, item, &disk_key);
1519 	btrfs_disk_key_to_cpu(key, &disk_key);
1520 }
1521 
1522 
1523 static inline u8 btrfs_key_type(struct btrfs_key *key)
1524 {
1525 	return key->type;
1526 }
1527 
1528 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1529 {
1530 	key->type = val;
1531 }
1532 
1533 /* struct btrfs_header */
1534 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1535 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1536 			  generation, 64);
1537 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1538 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1539 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1540 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1541 
1542 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1543 {
1544 	return (btrfs_header_flags(eb) & flag) == flag;
1545 }
1546 
1547 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1548 {
1549 	u64 flags = btrfs_header_flags(eb);
1550 	btrfs_set_header_flags(eb, flags | flag);
1551 	return (flags & flag) == flag;
1552 }
1553 
1554 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1555 {
1556 	u64 flags = btrfs_header_flags(eb);
1557 	btrfs_set_header_flags(eb, flags & ~flag);
1558 	return (flags & flag) == flag;
1559 }
1560 
1561 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1562 {
1563 	unsigned long ptr = offsetof(struct btrfs_header, fsid);
1564 	return (u8 *)ptr;
1565 }
1566 
1567 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1568 {
1569 	unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1570 	return (u8 *)ptr;
1571 }
1572 
1573 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1574 {
1575 	unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1576 	return (u8 *)ptr;
1577 }
1578 
1579 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1580 {
1581 	unsigned long ptr = offsetof(struct btrfs_header, csum);
1582 	return (u8 *)ptr;
1583 }
1584 
1585 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1586 {
1587 	return NULL;
1588 }
1589 
1590 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1591 {
1592 	return NULL;
1593 }
1594 
1595 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1596 {
1597 	return NULL;
1598 }
1599 
1600 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1601 {
1602 	return btrfs_header_level(eb) == 0;
1603 }
1604 
1605 /* struct btrfs_root_item */
1606 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1607 		   generation, 64);
1608 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1609 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1610 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1611 
1612 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1613 			 generation, 64);
1614 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1615 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1616 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1617 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1618 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1619 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1620 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1621 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1622 			 last_snapshot, 64);
1623 
1624 /* struct btrfs_super_block */
1625 
1626 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1627 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1628 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1629 			 generation, 64);
1630 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1631 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1632 			 struct btrfs_super_block, sys_chunk_array_size, 32);
1633 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1634 			 struct btrfs_super_block, chunk_root_generation, 64);
1635 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1636 			 root_level, 8);
1637 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1638 			 chunk_root, 64);
1639 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1640 			 chunk_root_level, 8);
1641 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1642 			 log_root, 64);
1643 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1644 			 log_root_transid, 64);
1645 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1646 			 log_root_level, 8);
1647 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1648 			 total_bytes, 64);
1649 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1650 			 bytes_used, 64);
1651 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1652 			 sectorsize, 32);
1653 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1654 			 nodesize, 32);
1655 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1656 			 leafsize, 32);
1657 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1658 			 stripesize, 32);
1659 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1660 			 root_dir_objectid, 64);
1661 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1662 			 num_devices, 64);
1663 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1664 			 compat_flags, 64);
1665 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1666 			 compat_flags, 64);
1667 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1668 			 incompat_flags, 64);
1669 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1670 			 csum_type, 16);
1671 
1672 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1673 {
1674 	int t = btrfs_super_csum_type(s);
1675 	BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1676 	return btrfs_csum_sizes[t];
1677 }
1678 
1679 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1680 {
1681 	return offsetof(struct btrfs_leaf, items);
1682 }
1683 
1684 /* struct btrfs_file_extent_item */
1685 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1686 
1687 static inline unsigned long
1688 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
1689 {
1690 	unsigned long offset = (unsigned long)e;
1691 	offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1692 	return offset;
1693 }
1694 
1695 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1696 {
1697 	return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1698 }
1699 
1700 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1701 		   disk_bytenr, 64);
1702 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1703 		   generation, 64);
1704 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1705 		   disk_num_bytes, 64);
1706 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1707 		  offset, 64);
1708 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1709 		   num_bytes, 64);
1710 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1711 		   ram_bytes, 64);
1712 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1713 		   compression, 8);
1714 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1715 		   encryption, 8);
1716 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1717 		   other_encoding, 16);
1718 
1719 /* this returns the number of file bytes represented by the inline item.
1720  * If an item is compressed, this is the uncompressed size
1721  */
1722 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1723 					       struct btrfs_file_extent_item *e)
1724 {
1725 	return btrfs_file_extent_ram_bytes(eb, e);
1726 }
1727 
1728 /*
1729  * this returns the number of bytes used by the item on disk, minus the
1730  * size of any extent headers.  If a file is compressed on disk, this is
1731  * the compressed size
1732  */
1733 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1734 						    struct btrfs_item *e)
1735 {
1736 	unsigned long offset;
1737 	offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1738 	return btrfs_item_size(eb, e) - offset;
1739 }
1740 
1741 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1742 {
1743 	return sb->s_fs_info;
1744 }
1745 
1746 static inline int btrfs_set_root_name(struct btrfs_root *root,
1747 				      const char *name, int len)
1748 {
1749 	/* if we already have a name just free it */
1750 	kfree(root->name);
1751 
1752 	root->name = kmalloc(len+1, GFP_KERNEL);
1753 	if (!root->name)
1754 		return -ENOMEM;
1755 
1756 	memcpy(root->name, name, len);
1757 	root->name[len] = '\0';
1758 
1759 	return 0;
1760 }
1761 
1762 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
1763 {
1764 	if (level == 0)
1765 		return root->leafsize;
1766 	return root->nodesize;
1767 }
1768 
1769 /* helper function to cast into the data area of the leaf. */
1770 #define btrfs_item_ptr(leaf, slot, type) \
1771 	((type *)(btrfs_leaf_data(leaf) + \
1772 	btrfs_item_offset_nr(leaf, slot)))
1773 
1774 #define btrfs_item_ptr_offset(leaf, slot) \
1775 	((unsigned long)(btrfs_leaf_data(leaf) + \
1776 	btrfs_item_offset_nr(leaf, slot)))
1777 
1778 static inline struct dentry *fdentry(struct file *file)
1779 {
1780 	return file->f_path.dentry;
1781 }
1782 
1783 /* extent-tree.c */
1784 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1785 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
1786 			   struct btrfs_root *root, unsigned long count);
1787 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
1788 int btrfs_update_pinned_extents(struct btrfs_root *root,
1789 				u64 bytenr, u64 num, int pin);
1790 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
1791 			struct btrfs_root *root, struct extent_buffer *leaf);
1792 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1793 			  struct btrfs_root *root, u64 objectid, u64 bytenr);
1794 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1795 struct btrfs_block_group_cache *btrfs_lookup_block_group(
1796 						 struct btrfs_fs_info *info,
1797 						 u64 bytenr);
1798 u64 btrfs_find_block_group(struct btrfs_root *root,
1799 			   u64 search_start, u64 search_hint, int owner);
1800 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1801 					     struct btrfs_root *root,
1802 					     u32 blocksize, u64 parent,
1803 					     u64 root_objectid,
1804 					     u64 ref_generation,
1805 					     int level,
1806 					     u64 hint,
1807 					     u64 empty_size);
1808 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
1809 					    struct btrfs_root *root,
1810 					    u64 bytenr, u32 blocksize,
1811 					    int level);
1812 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1813 		       struct btrfs_root *root,
1814 		       u64 num_bytes, u64 parent, u64 min_bytes,
1815 		       u64 root_objectid, u64 ref_generation,
1816 		       u64 owner, u64 empty_size, u64 hint_byte,
1817 		       u64 search_end, struct btrfs_key *ins, u64 data);
1818 int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
1819 				struct btrfs_root *root, u64 parent,
1820 				u64 root_objectid, u64 ref_generation,
1821 				u64 owner, struct btrfs_key *ins);
1822 int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans,
1823 				struct btrfs_root *root, u64 parent,
1824 				u64 root_objectid, u64 ref_generation,
1825 				u64 owner, struct btrfs_key *ins);
1826 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
1827 				  struct btrfs_root *root,
1828 				  u64 num_bytes, u64 min_alloc_size,
1829 				  u64 empty_size, u64 hint_byte,
1830 				  u64 search_end, struct btrfs_key *ins,
1831 				  u64 data);
1832 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1833 		  struct extent_buffer *orig_buf, struct extent_buffer *buf,
1834 		  u32 *nr_extents);
1835 int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1836 		    struct extent_buffer *buf, u32 nr_extents);
1837 int btrfs_update_ref(struct btrfs_trans_handle *trans,
1838 		     struct btrfs_root *root, struct extent_buffer *orig_buf,
1839 		     struct extent_buffer *buf, int start_slot, int nr);
1840 int btrfs_free_extent(struct btrfs_trans_handle *trans,
1841 		      struct btrfs_root *root,
1842 		      u64 bytenr, u64 num_bytes, u64 parent,
1843 		      u64 root_objectid, u64 ref_generation,
1844 		      u64 owner_objectid, int pin);
1845 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
1846 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1847 			       struct btrfs_root *root,
1848 			       struct extent_io_tree *unpin);
1849 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1850 			 struct btrfs_root *root,
1851 			 u64 bytenr, u64 num_bytes, u64 parent,
1852 			 u64 root_objectid, u64 ref_generation,
1853 			 u64 owner_objectid);
1854 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
1855 			    struct btrfs_root *root, u64 bytenr, u64 num_bytes,
1856 			    u64 orig_parent, u64 parent,
1857 			    u64 root_objectid, u64 ref_generation,
1858 			    u64 owner_objectid);
1859 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1860 				    struct btrfs_root *root);
1861 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
1862 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1863 int btrfs_read_block_groups(struct btrfs_root *root);
1864 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
1865 			   struct btrfs_root *root, u64 bytes_used,
1866 			   u64 type, u64 chunk_objectid, u64 chunk_offset,
1867 			   u64 size);
1868 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
1869 			     struct btrfs_root *root, u64 group_start);
1870 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
1871 int btrfs_free_reloc_root(struct btrfs_trans_handle *trans,
1872 			  struct btrfs_root *root);
1873 int btrfs_drop_dead_reloc_roots(struct btrfs_root *root);
1874 int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans,
1875 			       struct btrfs_root *root,
1876 			       struct extent_buffer *buf, u64 orig_start);
1877 int btrfs_add_dead_reloc_root(struct btrfs_root *root);
1878 int btrfs_cleanup_reloc_trees(struct btrfs_root *root);
1879 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
1880 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
1881 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
1882 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
1883 
1884 int btrfs_check_metadata_free_space(struct btrfs_root *root);
1885 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
1886 				u64 bytes);
1887 void btrfs_free_reserved_data_space(struct btrfs_root *root,
1888 				    struct inode *inode, u64 bytes);
1889 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
1890 				 u64 bytes);
1891 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
1892 			      u64 bytes);
1893 /* ctree.c */
1894 int btrfs_previous_item(struct btrfs_root *root,
1895 			struct btrfs_path *path, u64 min_objectid,
1896 			int type);
1897 int btrfs_merge_path(struct btrfs_trans_handle *trans,
1898 		     struct btrfs_root *root,
1899 		     struct btrfs_key *node_keys,
1900 		     u64 *nodes, int lowest_level);
1901 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
1902 			    struct btrfs_root *root, struct btrfs_path *path,
1903 			    struct btrfs_key *new_key);
1904 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
1905 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
1906 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
1907 			struct btrfs_key *key, int lowest_level,
1908 			int cache_only, u64 min_trans);
1909 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
1910 			 struct btrfs_key *max_key,
1911 			 struct btrfs_path *path, int cache_only,
1912 			 u64 min_trans);
1913 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1914 		    struct btrfs_root *root, struct extent_buffer *buf,
1915 		    struct extent_buffer *parent, int parent_slot,
1916 		    struct extent_buffer **cow_ret);
1917 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1918 		      struct btrfs_root *root,
1919 		      struct extent_buffer *buf,
1920 		      struct extent_buffer **cow_ret, u64 new_root_objectid);
1921 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1922 		      *root, struct btrfs_path *path, u32 data_size);
1923 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1924 			struct btrfs_root *root,
1925 			struct btrfs_path *path,
1926 			u32 new_size, int from_end);
1927 int btrfs_split_item(struct btrfs_trans_handle *trans,
1928 		     struct btrfs_root *root,
1929 		     struct btrfs_path *path,
1930 		     struct btrfs_key *new_key,
1931 		     unsigned long split_offset);
1932 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1933 		      *root, struct btrfs_key *key, struct btrfs_path *p, int
1934 		      ins_len, int cow);
1935 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1936 		       struct btrfs_root *root, struct extent_buffer *parent,
1937 		       int start_slot, int cache_only, u64 *last_ret,
1938 		       struct btrfs_key *progress);
1939 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1940 struct btrfs_path *btrfs_alloc_path(void);
1941 void btrfs_free_path(struct btrfs_path *p);
1942 void btrfs_set_path_blocking(struct btrfs_path *p);
1943 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
1944 
1945 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1946 		   struct btrfs_path *path, int slot, int nr);
1947 int btrfs_del_leaf(struct btrfs_trans_handle *trans,
1948 			    struct btrfs_root *root,
1949 			    struct btrfs_path *path, u64 bytenr);
1950 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1951 				 struct btrfs_root *root,
1952 				 struct btrfs_path *path)
1953 {
1954 	return btrfs_del_items(trans, root, path, path->slots[0], 1);
1955 }
1956 
1957 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1958 		      *root, struct btrfs_key *key, void *data, u32 data_size);
1959 int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
1960 			    struct btrfs_root *root,
1961 			    struct btrfs_path *path,
1962 			    struct btrfs_key *cpu_key, u32 *data_size,
1963 			    int nr);
1964 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1965 			     struct btrfs_root *root,
1966 			     struct btrfs_path *path,
1967 			     struct btrfs_key *cpu_key, u32 *data_size, int nr);
1968 
1969 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1970 					  struct btrfs_root *root,
1971 					  struct btrfs_path *path,
1972 					  struct btrfs_key *key,
1973 					  u32 data_size)
1974 {
1975 	return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1976 }
1977 
1978 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1979 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1980 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1981 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1982 			*root);
1983 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
1984 			struct btrfs_root *root,
1985 			struct extent_buffer *node,
1986 			struct extent_buffer *parent);
1987 /* root-item.c */
1988 int btrfs_find_root_ref(struct btrfs_root *tree_root,
1989 		   struct btrfs_path *path,
1990 		   u64 root_id, u64 ref_id);
1991 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
1992 		       struct btrfs_root *tree_root,
1993 		       u64 root_id, u8 type, u64 ref_id,
1994 		       u64 dirid, u64 sequence,
1995 		       const char *name, int name_len);
1996 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1997 		   struct btrfs_key *key);
1998 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1999 		      *root, struct btrfs_key *key, struct btrfs_root_item
2000 		      *item);
2001 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2002 		      *root, struct btrfs_key *key, struct btrfs_root_item
2003 		      *item);
2004 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2005 			 btrfs_root_item *item, struct btrfs_key *key);
2006 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
2007 		      u64 *found_objectid);
2008 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
2009 			  struct btrfs_root *latest_root);
2010 /* dir-item.c */
2011 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2012 			  struct btrfs_root *root, const char *name,
2013 			  int name_len, u64 dir,
2014 			  struct btrfs_key *location, u8 type, u64 index);
2015 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2016 					     struct btrfs_root *root,
2017 					     struct btrfs_path *path, u64 dir,
2018 					     const char *name, int name_len,
2019 					     int mod);
2020 struct btrfs_dir_item *
2021 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2022 			    struct btrfs_root *root,
2023 			    struct btrfs_path *path, u64 dir,
2024 			    u64 objectid, const char *name, int name_len,
2025 			    int mod);
2026 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2027 			      struct btrfs_path *path,
2028 			      const char *name, int name_len);
2029 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2030 			      struct btrfs_root *root,
2031 			      struct btrfs_path *path,
2032 			      struct btrfs_dir_item *di);
2033 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2034 			    struct btrfs_root *root, const char *name,
2035 			    u16 name_len, const void *data, u16 data_len,
2036 			    u64 dir);
2037 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2038 					  struct btrfs_root *root,
2039 					  struct btrfs_path *path, u64 dir,
2040 					  const char *name, u16 name_len,
2041 					  int mod);
2042 
2043 /* orphan.c */
2044 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2045 			     struct btrfs_root *root, u64 offset);
2046 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2047 			  struct btrfs_root *root, u64 offset);
2048 
2049 /* inode-map.c */
2050 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2051 			     struct btrfs_root *fs_root,
2052 			     u64 dirid, u64 *objectid);
2053 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2054 
2055 /* inode-item.c */
2056 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2057 			   struct btrfs_root *root,
2058 			   const char *name, int name_len,
2059 			   u64 inode_objectid, u64 ref_objectid, u64 index);
2060 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2061 			   struct btrfs_root *root,
2062 			   const char *name, int name_len,
2063 			   u64 inode_objectid, u64 ref_objectid, u64 *index);
2064 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2065 			     struct btrfs_root *root,
2066 			     struct btrfs_path *path, u64 objectid);
2067 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2068 		       *root, struct btrfs_path *path,
2069 		       struct btrfs_key *location, int mod);
2070 
2071 /* file-item.c */
2072 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2073 		    struct btrfs_root *root, u64 bytenr, u64 len);
2074 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2075 			  struct bio *bio, u32 *dst);
2076 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2077 			     struct btrfs_root *root,
2078 			     u64 objectid, u64 pos,
2079 			     u64 disk_offset, u64 disk_num_bytes,
2080 			     u64 num_bytes, u64 offset, u64 ram_bytes,
2081 			     u8 compression, u8 encryption, u16 other_encoding);
2082 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2083 			     struct btrfs_root *root,
2084 			     struct btrfs_path *path, u64 objectid,
2085 			     u64 bytenr, int mod);
2086 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2087 			   struct btrfs_root *root,
2088 			   struct btrfs_ordered_sum *sums);
2089 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2090 		       struct bio *bio, u64 file_start, int contig);
2091 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
2092 			  u64 start, unsigned long len);
2093 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2094 					  struct btrfs_root *root,
2095 					  struct btrfs_path *path,
2096 					  u64 bytenr, int cow);
2097 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2098 			struct btrfs_root *root, struct btrfs_path *path,
2099 			u64 isize);
2100 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
2101 			     u64 end, struct list_head *list);
2102 /* inode.c */
2103 
2104 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2105 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2106 #define ClearPageChecked ClearPageFsMisc
2107 #define SetPageChecked SetPageFsMisc
2108 #define PageChecked PageFsMisc
2109 #endif
2110 
2111 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2112 int btrfs_set_inode_index(struct inode *dir, u64 *index);
2113 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2114 		       struct btrfs_root *root,
2115 		       struct inode *dir, struct inode *inode,
2116 		       const char *name, int name_len);
2117 int btrfs_add_link(struct btrfs_trans_handle *trans,
2118 		   struct inode *parent_inode, struct inode *inode,
2119 		   const char *name, int name_len, int add_backref, u64 index);
2120 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2121 			       struct btrfs_root *root,
2122 			       struct inode *inode, u64 new_size,
2123 			       u32 min_type);
2124 
2125 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
2126 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
2127 int btrfs_writepages(struct address_space *mapping,
2128 		     struct writeback_control *wbc);
2129 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2130 			     struct btrfs_root *new_root, struct dentry *dentry,
2131 			     u64 new_dirid, u64 alloc_hint);
2132 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2133 			 size_t size, struct bio *bio, unsigned long bio_flags);
2134 
2135 unsigned long btrfs_force_ra(struct address_space *mapping,
2136 			      struct file_ra_state *ra, struct file *file,
2137 			      pgoff_t offset, pgoff_t last_index);
2138 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2139 int btrfs_readpage(struct file *file, struct page *page);
2140 void btrfs_delete_inode(struct inode *inode);
2141 void btrfs_put_inode(struct inode *inode);
2142 void btrfs_read_locked_inode(struct inode *inode);
2143 int btrfs_write_inode(struct inode *inode, int wait);
2144 void btrfs_dirty_inode(struct inode *inode);
2145 struct inode *btrfs_alloc_inode(struct super_block *sb);
2146 void btrfs_destroy_inode(struct inode *inode);
2147 int btrfs_init_cachep(void);
2148 void btrfs_destroy_cachep(void);
2149 long btrfs_ioctl_trans_end(struct file *file);
2150 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
2151 			    struct btrfs_root *root, int wait);
2152 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
2153 				struct btrfs_root *root);
2154 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2155 			 struct btrfs_root *root, int *is_new);
2156 int btrfs_commit_write(struct file *file, struct page *page,
2157 		       unsigned from, unsigned to);
2158 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2159 				    size_t page_offset, u64 start, u64 end,
2160 				    int create);
2161 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2162 			      struct btrfs_root *root,
2163 			      struct inode *inode);
2164 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2165 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2166 void btrfs_orphan_cleanup(struct btrfs_root *root);
2167 int btrfs_cont_expand(struct inode *inode, loff_t size);
2168 
2169 /* ioctl.c */
2170 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2171 
2172 /* file.c */
2173 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
2174 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2175 			    int skip_pinned);
2176 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
2177 extern struct file_operations btrfs_file_operations;
2178 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
2179 		       struct btrfs_root *root, struct inode *inode,
2180 		       u64 start, u64 end, u64 locked_end,
2181 		       u64 inline_limit, u64 *hint_block);
2182 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2183 			      struct btrfs_root *root,
2184 			      struct inode *inode, u64 start, u64 end);
2185 int btrfs_release_file(struct inode *inode, struct file *file);
2186 
2187 /* tree-defrag.c */
2188 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2189 			struct btrfs_root *root, int cache_only);
2190 
2191 /* sysfs.c */
2192 int btrfs_init_sysfs(void);
2193 void btrfs_exit_sysfs(void);
2194 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2195 int btrfs_sysfs_add_root(struct btrfs_root *root);
2196 void btrfs_sysfs_del_root(struct btrfs_root *root);
2197 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2198 
2199 /* xattr.c */
2200 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2201 
2202 /* super.c */
2203 u64 btrfs_parse_size(char *str);
2204 int btrfs_parse_options(struct btrfs_root *root, char *options);
2205 int btrfs_sync_fs(struct super_block *sb, int wait);
2206 
2207 /* acl.c */
2208 int btrfs_check_acl(struct inode *inode, int mask);
2209 int btrfs_init_acl(struct inode *inode, struct inode *dir);
2210 int btrfs_acl_chmod(struct inode *inode);
2211 
2212 #endif
2213