xref: /openbmc/linux/fs/btrfs/ctree.h (revision e8e0929d)
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_MAX_LEVEL 8
45 
46 #define BTRFS_COMPAT_EXTENT_TREE_V0
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 #define BTRFS_BTREE_INODE_OBJECTID 1
118 
119 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
120 
121 /*
122  * we can actually store much bigger names, but lets not confuse the rest
123  * of linux
124  */
125 #define BTRFS_NAME_LEN 255
126 
127 /* 32 bytes in various csum fields */
128 #define BTRFS_CSUM_SIZE 32
129 
130 /* csum types */
131 #define BTRFS_CSUM_TYPE_CRC32	0
132 
133 static int btrfs_csum_sizes[] = { 4, 0 };
134 
135 /* four bytes for CRC32 */
136 #define BTRFS_EMPTY_DIR_SIZE 0
137 
138 #define BTRFS_FT_UNKNOWN	0
139 #define BTRFS_FT_REG_FILE	1
140 #define BTRFS_FT_DIR		2
141 #define BTRFS_FT_CHRDEV		3
142 #define BTRFS_FT_BLKDEV		4
143 #define BTRFS_FT_FIFO		5
144 #define BTRFS_FT_SOCK		6
145 #define BTRFS_FT_SYMLINK	7
146 #define BTRFS_FT_XATTR		8
147 #define BTRFS_FT_MAX		9
148 
149 /*
150  * The key defines the order in the tree, and so it also defines (optimal)
151  * block layout.
152  *
153  * objectid corresponds to the inode number.
154  *
155  * type tells us things about the object, and is a kind of stream selector.
156  * so for a given inode, keys with type of 1 might refer to the inode data,
157  * type of 2 may point to file data in the btree and type == 3 may point to
158  * extents.
159  *
160  * offset is the starting byte offset for this key in the stream.
161  *
162  * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
163  * in cpu native order.  Otherwise they are identical and their sizes
164  * should be the same (ie both packed)
165  */
166 struct btrfs_disk_key {
167 	__le64 objectid;
168 	u8 type;
169 	__le64 offset;
170 } __attribute__ ((__packed__));
171 
172 struct btrfs_key {
173 	u64 objectid;
174 	u8 type;
175 	u64 offset;
176 } __attribute__ ((__packed__));
177 
178 struct btrfs_mapping_tree {
179 	struct extent_map_tree map_tree;
180 };
181 
182 #define BTRFS_UUID_SIZE 16
183 struct btrfs_dev_item {
184 	/* the internal btrfs device id */
185 	__le64 devid;
186 
187 	/* size of the device */
188 	__le64 total_bytes;
189 
190 	/* bytes used */
191 	__le64 bytes_used;
192 
193 	/* optimal io alignment for this device */
194 	__le32 io_align;
195 
196 	/* optimal io width for this device */
197 	__le32 io_width;
198 
199 	/* minimal io size for this device */
200 	__le32 sector_size;
201 
202 	/* type and info about this device */
203 	__le64 type;
204 
205 	/* expected generation for this device */
206 	__le64 generation;
207 
208 	/*
209 	 * starting byte of this partition on the device,
210 	 * to allow for stripe alignment in the future
211 	 */
212 	__le64 start_offset;
213 
214 	/* grouping information for allocation decisions */
215 	__le32 dev_group;
216 
217 	/* seek speed 0-100 where 100 is fastest */
218 	u8 seek_speed;
219 
220 	/* bandwidth 0-100 where 100 is fastest */
221 	u8 bandwidth;
222 
223 	/* btrfs generated uuid for this device */
224 	u8 uuid[BTRFS_UUID_SIZE];
225 
226 	/* uuid of FS who owns this device */
227 	u8 fsid[BTRFS_UUID_SIZE];
228 } __attribute__ ((__packed__));
229 
230 struct btrfs_stripe {
231 	__le64 devid;
232 	__le64 offset;
233 	u8 dev_uuid[BTRFS_UUID_SIZE];
234 } __attribute__ ((__packed__));
235 
236 struct btrfs_chunk {
237 	/* size of this chunk in bytes */
238 	__le64 length;
239 
240 	/* objectid of the root referencing this chunk */
241 	__le64 owner;
242 
243 	__le64 stripe_len;
244 	__le64 type;
245 
246 	/* optimal io alignment for this chunk */
247 	__le32 io_align;
248 
249 	/* optimal io width for this chunk */
250 	__le32 io_width;
251 
252 	/* minimal io size for this chunk */
253 	__le32 sector_size;
254 
255 	/* 2^16 stripes is quite a lot, a second limit is the size of a single
256 	 * item in the btree
257 	 */
258 	__le16 num_stripes;
259 
260 	/* sub stripes only matter for raid10 */
261 	__le16 sub_stripes;
262 	struct btrfs_stripe stripe;
263 	/* additional stripes go here */
264 } __attribute__ ((__packed__));
265 
266 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
267 {
268 	BUG_ON(num_stripes == 0);
269 	return sizeof(struct btrfs_chunk) +
270 		sizeof(struct btrfs_stripe) * (num_stripes - 1);
271 }
272 
273 #define BTRFS_FSID_SIZE 16
274 #define BTRFS_HEADER_FLAG_WRITTEN	(1ULL << 0)
275 #define BTRFS_HEADER_FLAG_RELOC		(1ULL << 1)
276 #define BTRFS_SUPER_FLAG_SEEDING	(1ULL << 32)
277 #define BTRFS_SUPER_FLAG_METADUMP	(1ULL << 33)
278 
279 #define BTRFS_BACKREF_REV_MAX		256
280 #define BTRFS_BACKREF_REV_SHIFT		56
281 #define BTRFS_BACKREF_REV_MASK		(((u64)BTRFS_BACKREF_REV_MAX - 1) << \
282 					 BTRFS_BACKREF_REV_SHIFT)
283 
284 #define BTRFS_OLD_BACKREF_REV		0
285 #define BTRFS_MIXED_BACKREF_REV		1
286 
287 /*
288  * every tree block (leaf or node) starts with this header.
289  */
290 struct btrfs_header {
291 	/* these first four must match the super block */
292 	u8 csum[BTRFS_CSUM_SIZE];
293 	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
294 	__le64 bytenr; /* which block this node is supposed to live in */
295 	__le64 flags;
296 
297 	/* allowed to be different from the super from here on down */
298 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
299 	__le64 generation;
300 	__le64 owner;
301 	__le32 nritems;
302 	u8 level;
303 } __attribute__ ((__packed__));
304 
305 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
306 				      sizeof(struct btrfs_header)) / \
307 				     sizeof(struct btrfs_key_ptr))
308 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
309 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
310 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
311 					sizeof(struct btrfs_item) - \
312 					sizeof(struct btrfs_file_extent_item))
313 
314 
315 /*
316  * this is a very generous portion of the super block, giving us
317  * room to translate 14 chunks with 3 stripes each.
318  */
319 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
320 #define BTRFS_LABEL_SIZE 256
321 
322 /*
323  * the super block basically lists the main trees of the FS
324  * it currently lacks any block count etc etc
325  */
326 struct btrfs_super_block {
327 	u8 csum[BTRFS_CSUM_SIZE];
328 	/* the first 4 fields must match struct btrfs_header */
329 	u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
330 	__le64 bytenr; /* this block number */
331 	__le64 flags;
332 
333 	/* allowed to be different from the btrfs_header from here own down */
334 	__le64 magic;
335 	__le64 generation;
336 	__le64 root;
337 	__le64 chunk_root;
338 	__le64 log_root;
339 
340 	/* this will help find the new super based on the log root */
341 	__le64 log_root_transid;
342 	__le64 total_bytes;
343 	__le64 bytes_used;
344 	__le64 root_dir_objectid;
345 	__le64 num_devices;
346 	__le32 sectorsize;
347 	__le32 nodesize;
348 	__le32 leafsize;
349 	__le32 stripesize;
350 	__le32 sys_chunk_array_size;
351 	__le64 chunk_root_generation;
352 	__le64 compat_flags;
353 	__le64 compat_ro_flags;
354 	__le64 incompat_flags;
355 	__le16 csum_type;
356 	u8 root_level;
357 	u8 chunk_root_level;
358 	u8 log_root_level;
359 	struct btrfs_dev_item dev_item;
360 
361 	char label[BTRFS_LABEL_SIZE];
362 
363 	/* future expansion */
364 	__le64 reserved[32];
365 	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
366 } __attribute__ ((__packed__));
367 
368 /*
369  * Compat flags that we support.  If any incompat flags are set other than the
370  * ones specified below then we will fail to mount
371  */
372 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF	(1ULL << 0)
373 
374 #define BTRFS_FEATURE_COMPAT_SUPP		0ULL
375 #define BTRFS_FEATURE_COMPAT_RO_SUPP		0ULL
376 #define BTRFS_FEATURE_INCOMPAT_SUPP		\
377 	BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
378 
379 /*
380  * A leaf is full of items. offset and size tell us where to find
381  * the item in the leaf (relative to the start of the data area)
382  */
383 struct btrfs_item {
384 	struct btrfs_disk_key key;
385 	__le32 offset;
386 	__le32 size;
387 } __attribute__ ((__packed__));
388 
389 /*
390  * leaves have an item area and a data area:
391  * [item0, item1....itemN] [free space] [dataN...data1, data0]
392  *
393  * The data is separate from the items to get the keys closer together
394  * during searches.
395  */
396 struct btrfs_leaf {
397 	struct btrfs_header header;
398 	struct btrfs_item items[];
399 } __attribute__ ((__packed__));
400 
401 /*
402  * all non-leaf blocks are nodes, they hold only keys and pointers to
403  * other blocks
404  */
405 struct btrfs_key_ptr {
406 	struct btrfs_disk_key key;
407 	__le64 blockptr;
408 	__le64 generation;
409 } __attribute__ ((__packed__));
410 
411 struct btrfs_node {
412 	struct btrfs_header header;
413 	struct btrfs_key_ptr ptrs[];
414 } __attribute__ ((__packed__));
415 
416 /*
417  * btrfs_paths remember the path taken from the root down to the leaf.
418  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
419  * to any other levels that are present.
420  *
421  * The slots array records the index of the item or block pointer
422  * used while walking the tree.
423  */
424 struct btrfs_path {
425 	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
426 	int slots[BTRFS_MAX_LEVEL];
427 	/* if there is real range locking, this locks field will change */
428 	int locks[BTRFS_MAX_LEVEL];
429 	int reada;
430 	/* keep some upper locks as we walk down */
431 	int lowest_level;
432 
433 	/*
434 	 * set by btrfs_split_item, tells search_slot to keep all locks
435 	 * and to force calls to keep space in the nodes
436 	 */
437 	unsigned int search_for_split:1;
438 	unsigned int keep_locks:1;
439 	unsigned int skip_locking:1;
440 	unsigned int leave_spinning:1;
441 	unsigned int search_commit_root:1;
442 };
443 
444 /*
445  * items in the extent btree are used to record the objectid of the
446  * owner of the block and the number of references
447  */
448 
449 struct btrfs_extent_item {
450 	__le64 refs;
451 	__le64 generation;
452 	__le64 flags;
453 } __attribute__ ((__packed__));
454 
455 struct btrfs_extent_item_v0 {
456 	__le32 refs;
457 } __attribute__ ((__packed__));
458 
459 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
460 					sizeof(struct btrfs_item))
461 
462 #define BTRFS_EXTENT_FLAG_DATA		(1ULL << 0)
463 #define BTRFS_EXTENT_FLAG_TREE_BLOCK	(1ULL << 1)
464 
465 /* following flags only apply to tree blocks */
466 
467 /* use full backrefs for extent pointers in the block */
468 #define BTRFS_BLOCK_FLAG_FULL_BACKREF	(1ULL << 8)
469 
470 struct btrfs_tree_block_info {
471 	struct btrfs_disk_key key;
472 	u8 level;
473 } __attribute__ ((__packed__));
474 
475 struct btrfs_extent_data_ref {
476 	__le64 root;
477 	__le64 objectid;
478 	__le64 offset;
479 	__le32 count;
480 } __attribute__ ((__packed__));
481 
482 struct btrfs_shared_data_ref {
483 	__le32 count;
484 } __attribute__ ((__packed__));
485 
486 struct btrfs_extent_inline_ref {
487 	u8 type;
488 	__le64 offset;
489 } __attribute__ ((__packed__));
490 
491 /* old style backrefs item */
492 struct btrfs_extent_ref_v0 {
493 	__le64 root;
494 	__le64 generation;
495 	__le64 objectid;
496 	__le32 count;
497 } __attribute__ ((__packed__));
498 
499 
500 /* dev extents record free space on individual devices.  The owner
501  * field points back to the chunk allocation mapping tree that allocated
502  * the extent.  The chunk tree uuid field is a way to double check the owner
503  */
504 struct btrfs_dev_extent {
505 	__le64 chunk_tree;
506 	__le64 chunk_objectid;
507 	__le64 chunk_offset;
508 	__le64 length;
509 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
510 } __attribute__ ((__packed__));
511 
512 struct btrfs_inode_ref {
513 	__le64 index;
514 	__le16 name_len;
515 	/* name goes here */
516 } __attribute__ ((__packed__));
517 
518 struct btrfs_timespec {
519 	__le64 sec;
520 	__le32 nsec;
521 } __attribute__ ((__packed__));
522 
523 enum btrfs_compression_type {
524 	BTRFS_COMPRESS_NONE = 0,
525 	BTRFS_COMPRESS_ZLIB = 1,
526 	BTRFS_COMPRESS_LAST = 2,
527 };
528 
529 struct btrfs_inode_item {
530 	/* nfs style generation number */
531 	__le64 generation;
532 	/* transid that last touched this inode */
533 	__le64 transid;
534 	__le64 size;
535 	__le64 nbytes;
536 	__le64 block_group;
537 	__le32 nlink;
538 	__le32 uid;
539 	__le32 gid;
540 	__le32 mode;
541 	__le64 rdev;
542 	__le64 flags;
543 
544 	/* modification sequence number for NFS */
545 	__le64 sequence;
546 
547 	/*
548 	 * a little future expansion, for more than this we can
549 	 * just grow the inode item and version it
550 	 */
551 	__le64 reserved[4];
552 	struct btrfs_timespec atime;
553 	struct btrfs_timespec ctime;
554 	struct btrfs_timespec mtime;
555 	struct btrfs_timespec otime;
556 } __attribute__ ((__packed__));
557 
558 struct btrfs_dir_log_item {
559 	__le64 end;
560 } __attribute__ ((__packed__));
561 
562 struct btrfs_dir_item {
563 	struct btrfs_disk_key location;
564 	__le64 transid;
565 	__le16 data_len;
566 	__le16 name_len;
567 	u8 type;
568 } __attribute__ ((__packed__));
569 
570 struct btrfs_root_item {
571 	struct btrfs_inode_item inode;
572 	__le64 generation;
573 	__le64 root_dirid;
574 	__le64 bytenr;
575 	__le64 byte_limit;
576 	__le64 bytes_used;
577 	__le64 last_snapshot;
578 	__le64 flags;
579 	__le32 refs;
580 	struct btrfs_disk_key drop_progress;
581 	u8 drop_level;
582 	u8 level;
583 } __attribute__ ((__packed__));
584 
585 /*
586  * this is used for both forward and backward root refs
587  */
588 struct btrfs_root_ref {
589 	__le64 dirid;
590 	__le64 sequence;
591 	__le16 name_len;
592 } __attribute__ ((__packed__));
593 
594 #define BTRFS_FILE_EXTENT_INLINE 0
595 #define BTRFS_FILE_EXTENT_REG 1
596 #define BTRFS_FILE_EXTENT_PREALLOC 2
597 
598 struct btrfs_file_extent_item {
599 	/*
600 	 * transaction id that created this extent
601 	 */
602 	__le64 generation;
603 	/*
604 	 * max number of bytes to hold this extent in ram
605 	 * when we split a compressed extent we can't know how big
606 	 * each of the resulting pieces will be.  So, this is
607 	 * an upper limit on the size of the extent in ram instead of
608 	 * an exact limit.
609 	 */
610 	__le64 ram_bytes;
611 
612 	/*
613 	 * 32 bits for the various ways we might encode the data,
614 	 * including compression and encryption.  If any of these
615 	 * are set to something a given disk format doesn't understand
616 	 * it is treated like an incompat flag for reading and writing,
617 	 * but not for stat.
618 	 */
619 	u8 compression;
620 	u8 encryption;
621 	__le16 other_encoding; /* spare for later use */
622 
623 	/* are we inline data or a real extent? */
624 	u8 type;
625 
626 	/*
627 	 * disk space consumed by the extent, checksum blocks are included
628 	 * in these numbers
629 	 */
630 	__le64 disk_bytenr;
631 	__le64 disk_num_bytes;
632 	/*
633 	 * the logical offset in file blocks (no csums)
634 	 * this extent record is for.  This allows a file extent to point
635 	 * into the middle of an existing extent on disk, sharing it
636 	 * between two snapshots (useful if some bytes in the middle of the
637 	 * extent have changed
638 	 */
639 	__le64 offset;
640 	/*
641 	 * the logical number of file blocks (no csums included).  This
642 	 * always reflects the size uncompressed and without encoding.
643 	 */
644 	__le64 num_bytes;
645 
646 } __attribute__ ((__packed__));
647 
648 struct btrfs_csum_item {
649 	u8 csum;
650 } __attribute__ ((__packed__));
651 
652 /* different types of block groups (and chunks) */
653 #define BTRFS_BLOCK_GROUP_DATA     (1 << 0)
654 #define BTRFS_BLOCK_GROUP_SYSTEM   (1 << 1)
655 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
656 #define BTRFS_BLOCK_GROUP_RAID0    (1 << 3)
657 #define BTRFS_BLOCK_GROUP_RAID1    (1 << 4)
658 #define BTRFS_BLOCK_GROUP_DUP	   (1 << 5)
659 #define BTRFS_BLOCK_GROUP_RAID10   (1 << 6)
660 
661 struct btrfs_block_group_item {
662 	__le64 used;
663 	__le64 chunk_objectid;
664 	__le64 flags;
665 } __attribute__ ((__packed__));
666 
667 struct btrfs_space_info {
668 	u64 flags;
669 
670 	u64 total_bytes;	/* total bytes in the space */
671 	u64 bytes_used;		/* total bytes used on disk */
672 	u64 bytes_pinned;	/* total bytes pinned, will be freed when the
673 				   transaction finishes */
674 	u64 bytes_reserved;	/* total bytes the allocator has reserved for
675 				   current allocations */
676 	u64 bytes_readonly;	/* total bytes that are read only */
677 	u64 bytes_super;	/* total bytes reserved for the super blocks */
678 	u64 bytes_root;		/* the number of bytes needed to commit a
679 				   transaction */
680 	u64 bytes_may_use;	/* number of bytes that may be used for
681 				   delalloc/allocations */
682 	u64 bytes_delalloc;	/* number of bytes currently reserved for
683 				   delayed allocation */
684 
685 	int full;		/* indicates that we cannot allocate any more
686 				   chunks for this space */
687 	int force_alloc;	/* set if we need to force a chunk alloc for
688 				   this space */
689 	int force_delalloc;	/* make people start doing filemap_flush until
690 				   we're under a threshold */
691 
692 	struct list_head list;
693 
694 	/* for block groups in our same type */
695 	struct list_head block_groups;
696 	spinlock_t lock;
697 	struct rw_semaphore groups_sem;
698 	atomic_t caching_threads;
699 
700 	int allocating_chunk;
701 	wait_queue_head_t wait;
702 };
703 
704 /*
705  * free clusters are used to claim free space in relatively large chunks,
706  * allowing us to do less seeky writes.  They are used for all metadata
707  * allocations and data allocations in ssd mode.
708  */
709 struct btrfs_free_cluster {
710 	spinlock_t lock;
711 	spinlock_t refill_lock;
712 	struct rb_root root;
713 
714 	/* largest extent in this cluster */
715 	u64 max_size;
716 
717 	/* first extent starting offset */
718 	u64 window_start;
719 
720 	/* if this cluster simply points at a bitmap in the block group */
721 	bool points_to_bitmap;
722 
723 	struct btrfs_block_group_cache *block_group;
724 	/*
725 	 * when a cluster is allocated from a block group, we put the
726 	 * cluster onto a list in the block group so that it can
727 	 * be freed before the block group is freed.
728 	 */
729 	struct list_head block_group_list;
730 };
731 
732 enum btrfs_caching_type {
733 	BTRFS_CACHE_NO		= 0,
734 	BTRFS_CACHE_STARTED	= 1,
735 	BTRFS_CACHE_FINISHED	= 2,
736 };
737 
738 struct btrfs_caching_control {
739 	struct list_head list;
740 	struct mutex mutex;
741 	wait_queue_head_t wait;
742 	struct btrfs_block_group_cache *block_group;
743 	u64 progress;
744 	atomic_t count;
745 };
746 
747 struct btrfs_block_group_cache {
748 	struct btrfs_key key;
749 	struct btrfs_block_group_item item;
750 	struct btrfs_fs_info *fs_info;
751 	spinlock_t lock;
752 	u64 pinned;
753 	u64 reserved;
754 	u64 bytes_super;
755 	u64 flags;
756 	u64 sectorsize;
757 	int extents_thresh;
758 	int free_extents;
759 	int total_bitmaps;
760 	int ro;
761 	int dirty;
762 
763 	/* cache tracking stuff */
764 	int cached;
765 	struct btrfs_caching_control *caching_ctl;
766 	u64 last_byte_to_unpin;
767 
768 	struct btrfs_space_info *space_info;
769 
770 	/* free space cache stuff */
771 	spinlock_t tree_lock;
772 	struct rb_root free_space_offset;
773 	u64 free_space;
774 
775 	/* block group cache stuff */
776 	struct rb_node cache_node;
777 
778 	/* for block groups in the same raid type */
779 	struct list_head list;
780 
781 	/* usage count */
782 	atomic_t count;
783 
784 	/* List of struct btrfs_free_clusters for this block group.
785 	 * Today it will only have one thing on it, but that may change
786 	 */
787 	struct list_head cluster_list;
788 };
789 
790 struct reloc_control;
791 struct btrfs_device;
792 struct btrfs_fs_devices;
793 struct btrfs_fs_info {
794 	u8 fsid[BTRFS_FSID_SIZE];
795 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
796 	struct btrfs_root *extent_root;
797 	struct btrfs_root *tree_root;
798 	struct btrfs_root *chunk_root;
799 	struct btrfs_root *dev_root;
800 	struct btrfs_root *fs_root;
801 	struct btrfs_root *csum_root;
802 
803 	/* the log root tree is a directory of all the other log roots */
804 	struct btrfs_root *log_root_tree;
805 
806 	spinlock_t fs_roots_radix_lock;
807 	struct radix_tree_root fs_roots_radix;
808 
809 	/* block group cache stuff */
810 	spinlock_t block_group_cache_lock;
811 	struct rb_root block_group_cache_tree;
812 
813 	struct extent_io_tree freed_extents[2];
814 	struct extent_io_tree *pinned_extents;
815 
816 	/* logical->physical extent mapping */
817 	struct btrfs_mapping_tree mapping_tree;
818 
819 	u64 generation;
820 	u64 last_trans_committed;
821 
822 	/*
823 	 * this is updated to the current trans every time a full commit
824 	 * is required instead of the faster short fsync log commits
825 	 */
826 	u64 last_trans_log_full_commit;
827 	u64 open_ioctl_trans;
828 	unsigned long mount_opt;
829 	u64 max_extent;
830 	u64 max_inline;
831 	u64 alloc_start;
832 	struct btrfs_transaction *running_transaction;
833 	wait_queue_head_t transaction_throttle;
834 	wait_queue_head_t transaction_wait;
835 	wait_queue_head_t async_submit_wait;
836 
837 	struct btrfs_super_block super_copy;
838 	struct btrfs_super_block super_for_commit;
839 	struct block_device *__bdev;
840 	struct super_block *sb;
841 	struct inode *btree_inode;
842 	struct backing_dev_info bdi;
843 	struct mutex trans_mutex;
844 	struct mutex tree_log_mutex;
845 	struct mutex transaction_kthread_mutex;
846 	struct mutex cleaner_mutex;
847 	struct mutex chunk_mutex;
848 	struct mutex volume_mutex;
849 	/*
850 	 * this protects the ordered operations list only while we are
851 	 * processing all of the entries on it.  This way we make
852 	 * sure the commit code doesn't find the list temporarily empty
853 	 * because another function happens to be doing non-waiting preflush
854 	 * before jumping into the main commit.
855 	 */
856 	struct mutex ordered_operations_mutex;
857 	struct rw_semaphore extent_commit_sem;
858 
859 	struct rw_semaphore subvol_sem;
860 
861 	struct srcu_struct subvol_srcu;
862 
863 	struct list_head trans_list;
864 	struct list_head hashers;
865 	struct list_head dead_roots;
866 	struct list_head caching_block_groups;
867 
868 	atomic_t nr_async_submits;
869 	atomic_t async_submit_draining;
870 	atomic_t nr_async_bios;
871 	atomic_t async_delalloc_pages;
872 
873 	/*
874 	 * this is used by the balancing code to wait for all the pending
875 	 * ordered extents
876 	 */
877 	spinlock_t ordered_extent_lock;
878 
879 	/*
880 	 * all of the data=ordered extents pending writeback
881 	 * these can span multiple transactions and basically include
882 	 * every dirty data page that isn't from nodatacow
883 	 */
884 	struct list_head ordered_extents;
885 
886 	/*
887 	 * all of the inodes that have delalloc bytes.  It is possible for
888 	 * this list to be empty even when there is still dirty data=ordered
889 	 * extents waiting to finish IO.
890 	 */
891 	struct list_head delalloc_inodes;
892 
893 	/*
894 	 * special rename and truncate targets that must be on disk before
895 	 * we're allowed to commit.  This is basically the ext3 style
896 	 * data=ordered list.
897 	 */
898 	struct list_head ordered_operations;
899 
900 	/*
901 	 * there is a pool of worker threads for checksumming during writes
902 	 * and a pool for checksumming after reads.  This is because readers
903 	 * can run with FS locks held, and the writers may be waiting for
904 	 * those locks.  We don't want ordering in the pending list to cause
905 	 * deadlocks, and so the two are serviced separately.
906 	 *
907 	 * A third pool does submit_bio to avoid deadlocking with the other
908 	 * two
909 	 */
910 	struct btrfs_workers workers;
911 	struct btrfs_workers delalloc_workers;
912 	struct btrfs_workers endio_workers;
913 	struct btrfs_workers endio_meta_workers;
914 	struct btrfs_workers endio_meta_write_workers;
915 	struct btrfs_workers endio_write_workers;
916 	struct btrfs_workers submit_workers;
917 	/*
918 	 * fixup workers take dirty pages that didn't properly go through
919 	 * the cow mechanism and make them safe to write.  It happens
920 	 * for the sys_munmap function call path
921 	 */
922 	struct btrfs_workers fixup_workers;
923 	struct task_struct *transaction_kthread;
924 	struct task_struct *cleaner_kthread;
925 	int thread_pool_size;
926 
927 	struct kobject super_kobj;
928 	struct completion kobj_unregister;
929 	int do_barriers;
930 	int closing;
931 	int log_root_recovering;
932 
933 	u64 total_pinned;
934 
935 	/* protected by the delalloc lock, used to keep from writing
936 	 * metadata until there is a nice batch
937 	 */
938 	u64 dirty_metadata_bytes;
939 	struct list_head dirty_cowonly_roots;
940 
941 	struct btrfs_fs_devices *fs_devices;
942 
943 	/*
944 	 * the space_info list is almost entirely read only.  It only changes
945 	 * when we add a new raid type to the FS, and that happens
946 	 * very rarely.  RCU is used to protect it.
947 	 */
948 	struct list_head space_info;
949 
950 	struct reloc_control *reloc_ctl;
951 
952 	spinlock_t delalloc_lock;
953 	spinlock_t new_trans_lock;
954 	u64 delalloc_bytes;
955 
956 	/* data_alloc_cluster is only used in ssd mode */
957 	struct btrfs_free_cluster data_alloc_cluster;
958 
959 	/* all metadata allocations go through this cluster */
960 	struct btrfs_free_cluster meta_alloc_cluster;
961 
962 	spinlock_t ref_cache_lock;
963 	u64 total_ref_cache_size;
964 
965 	u64 avail_data_alloc_bits;
966 	u64 avail_metadata_alloc_bits;
967 	u64 avail_system_alloc_bits;
968 	u64 data_alloc_profile;
969 	u64 metadata_alloc_profile;
970 	u64 system_alloc_profile;
971 
972 	unsigned data_chunk_allocations;
973 	unsigned metadata_ratio;
974 
975 	void *bdev_holder;
976 };
977 
978 /*
979  * in ram representation of the tree.  extent_root is used for all allocations
980  * and for the extent tree extent_root root.
981  */
982 struct btrfs_root {
983 	struct extent_buffer *node;
984 
985 	/* the node lock is held while changing the node pointer */
986 	spinlock_t node_lock;
987 
988 	struct extent_buffer *commit_root;
989 	struct btrfs_root *log_root;
990 	struct btrfs_root *reloc_root;
991 
992 	struct btrfs_root_item root_item;
993 	struct btrfs_key root_key;
994 	struct btrfs_fs_info *fs_info;
995 	struct extent_io_tree dirty_log_pages;
996 
997 	struct kobject root_kobj;
998 	struct completion kobj_unregister;
999 	struct mutex objectid_mutex;
1000 
1001 	struct mutex log_mutex;
1002 	wait_queue_head_t log_writer_wait;
1003 	wait_queue_head_t log_commit_wait[2];
1004 	atomic_t log_writers;
1005 	atomic_t log_commit[2];
1006 	unsigned long log_transid;
1007 	unsigned long log_batch;
1008 
1009 	u64 objectid;
1010 	u64 last_trans;
1011 
1012 	/* data allocations are done in sectorsize units */
1013 	u32 sectorsize;
1014 
1015 	/* node allocations are done in nodesize units */
1016 	u32 nodesize;
1017 
1018 	/* leaf allocations are done in leafsize units */
1019 	u32 leafsize;
1020 
1021 	u32 stripesize;
1022 
1023 	u32 type;
1024 
1025 	u64 highest_objectid;
1026 	int ref_cows;
1027 	int track_dirty;
1028 	int in_radix;
1029 
1030 	u64 defrag_trans_start;
1031 	struct btrfs_key defrag_progress;
1032 	struct btrfs_key defrag_max;
1033 	int defrag_running;
1034 	int defrag_level;
1035 	char *name;
1036 	int in_sysfs;
1037 
1038 	/* the dirty list is only used by non-reference counted roots */
1039 	struct list_head dirty_list;
1040 
1041 	struct list_head root_list;
1042 
1043 	spinlock_t list_lock;
1044 	struct list_head orphan_list;
1045 
1046 	spinlock_t inode_lock;
1047 	/* red-black tree that keeps track of in-memory inodes */
1048 	struct rb_root inode_tree;
1049 
1050 	/*
1051 	 * right now this just gets used so that a root has its own devid
1052 	 * for stat.  It may be used for more later
1053 	 */
1054 	struct super_block anon_super;
1055 };
1056 
1057 /*
1058  * inode items have the data typically returned from stat and store other
1059  * info about object characteristics.  There is one for every file and dir in
1060  * the FS
1061  */
1062 #define BTRFS_INODE_ITEM_KEY		1
1063 #define BTRFS_INODE_REF_KEY		12
1064 #define BTRFS_XATTR_ITEM_KEY		24
1065 #define BTRFS_ORPHAN_ITEM_KEY		48
1066 /* reserve 2-15 close to the inode for later flexibility */
1067 
1068 /*
1069  * dir items are the name -> inode pointers in a directory.  There is one
1070  * for every name in a directory.
1071  */
1072 #define BTRFS_DIR_LOG_ITEM_KEY  60
1073 #define BTRFS_DIR_LOG_INDEX_KEY 72
1074 #define BTRFS_DIR_ITEM_KEY	84
1075 #define BTRFS_DIR_INDEX_KEY	96
1076 /*
1077  * extent data is for file data
1078  */
1079 #define BTRFS_EXTENT_DATA_KEY	108
1080 
1081 /*
1082  * extent csums are stored in a separate tree and hold csums for
1083  * an entire extent on disk.
1084  */
1085 #define BTRFS_EXTENT_CSUM_KEY	128
1086 
1087 /*
1088  * root items point to tree roots.  They are typically in the root
1089  * tree used by the super block to find all the other trees
1090  */
1091 #define BTRFS_ROOT_ITEM_KEY	132
1092 
1093 /*
1094  * root backrefs tie subvols and snapshots to the directory entries that
1095  * reference them
1096  */
1097 #define BTRFS_ROOT_BACKREF_KEY	144
1098 
1099 /*
1100  * root refs make a fast index for listing all of the snapshots and
1101  * subvolumes referenced by a given root.  They point directly to the
1102  * directory item in the root that references the subvol
1103  */
1104 #define BTRFS_ROOT_REF_KEY	156
1105 
1106 /*
1107  * extent items are in the extent map tree.  These record which blocks
1108  * are used, and how many references there are to each block
1109  */
1110 #define BTRFS_EXTENT_ITEM_KEY	168
1111 
1112 #define BTRFS_TREE_BLOCK_REF_KEY	176
1113 
1114 #define BTRFS_EXTENT_DATA_REF_KEY	178
1115 
1116 #define BTRFS_EXTENT_REF_V0_KEY		180
1117 
1118 #define BTRFS_SHARED_BLOCK_REF_KEY	182
1119 
1120 #define BTRFS_SHARED_DATA_REF_KEY	184
1121 
1122 /*
1123  * block groups give us hints into the extent allocation trees.  Which
1124  * blocks are free etc etc
1125  */
1126 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1127 
1128 #define BTRFS_DEV_EXTENT_KEY	204
1129 #define BTRFS_DEV_ITEM_KEY	216
1130 #define BTRFS_CHUNK_ITEM_KEY	228
1131 
1132 /*
1133  * string items are for debugging.  They just store a short string of
1134  * data in the FS
1135  */
1136 #define BTRFS_STRING_ITEM_KEY	253
1137 
1138 #define BTRFS_MOUNT_NODATASUM		(1 << 0)
1139 #define BTRFS_MOUNT_NODATACOW		(1 << 1)
1140 #define BTRFS_MOUNT_NOBARRIER		(1 << 2)
1141 #define BTRFS_MOUNT_SSD			(1 << 3)
1142 #define BTRFS_MOUNT_DEGRADED		(1 << 4)
1143 #define BTRFS_MOUNT_COMPRESS		(1 << 5)
1144 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1145 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1146 #define BTRFS_MOUNT_SSD_SPREAD		(1 << 8)
1147 #define BTRFS_MOUNT_NOSSD		(1 << 9)
1148 
1149 #define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
1150 #define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
1151 #define btrfs_test_opt(root, opt)	((root)->fs_info->mount_opt & \
1152 					 BTRFS_MOUNT_##opt)
1153 /*
1154  * Inode flags
1155  */
1156 #define BTRFS_INODE_NODATASUM		(1 << 0)
1157 #define BTRFS_INODE_NODATACOW		(1 << 1)
1158 #define BTRFS_INODE_READONLY		(1 << 2)
1159 #define BTRFS_INODE_NOCOMPRESS		(1 << 3)
1160 #define BTRFS_INODE_PREALLOC		(1 << 4)
1161 #define BTRFS_INODE_SYNC		(1 << 5)
1162 #define BTRFS_INODE_IMMUTABLE		(1 << 6)
1163 #define BTRFS_INODE_APPEND		(1 << 7)
1164 #define BTRFS_INODE_NODUMP		(1 << 8)
1165 #define BTRFS_INODE_NOATIME		(1 << 9)
1166 #define BTRFS_INODE_DIRSYNC		(1 << 10)
1167 
1168 
1169 /* some macros to generate set/get funcs for the struct fields.  This
1170  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1171  * one for u8:
1172  */
1173 #define le8_to_cpu(v) (v)
1174 #define cpu_to_le8(v) (v)
1175 #define __le8 u8
1176 
1177 #define read_eb_member(eb, ptr, type, member, result) (			\
1178 	read_extent_buffer(eb, (char *)(result),			\
1179 			   ((unsigned long)(ptr)) +			\
1180 			    offsetof(type, member),			\
1181 			   sizeof(((type *)0)->member)))
1182 
1183 #define write_eb_member(eb, ptr, type, member, result) (		\
1184 	write_extent_buffer(eb, (char *)(result),			\
1185 			   ((unsigned long)(ptr)) +			\
1186 			    offsetof(type, member),			\
1187 			   sizeof(((type *)0)->member)))
1188 
1189 #ifndef BTRFS_SETGET_FUNCS
1190 #define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
1191 u##bits btrfs_##name(struct extent_buffer *eb, type *s);		\
1192 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1193 #endif
1194 
1195 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
1196 static inline u##bits btrfs_##name(struct extent_buffer *eb)		\
1197 {									\
1198 	type *p = kmap_atomic(eb->first_page, KM_USER0);		\
1199 	u##bits res = le##bits##_to_cpu(p->member);			\
1200 	kunmap_atomic(p, KM_USER0);					\
1201 	return res;							\
1202 }									\
1203 static inline void btrfs_set_##name(struct extent_buffer *eb,		\
1204 				    u##bits val)			\
1205 {									\
1206 	type *p = kmap_atomic(eb->first_page, KM_USER0);		\
1207 	p->member = cpu_to_le##bits(val);				\
1208 	kunmap_atomic(p, KM_USER0);					\
1209 }
1210 
1211 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
1212 static inline u##bits btrfs_##name(type *s)				\
1213 {									\
1214 	return le##bits##_to_cpu(s->member);				\
1215 }									\
1216 static inline void btrfs_set_##name(type *s, u##bits val)		\
1217 {									\
1218 	s->member = cpu_to_le##bits(val);				\
1219 }
1220 
1221 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1222 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1223 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1224 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1225 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1226 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1227 		   start_offset, 64);
1228 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1229 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1230 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1231 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1232 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1233 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1234 
1235 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1236 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1237 			 total_bytes, 64);
1238 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1239 			 bytes_used, 64);
1240 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1241 			 io_align, 32);
1242 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1243 			 io_width, 32);
1244 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1245 			 sector_size, 32);
1246 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1247 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1248 			 dev_group, 32);
1249 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1250 			 seek_speed, 8);
1251 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1252 			 bandwidth, 8);
1253 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1254 			 generation, 64);
1255 
1256 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1257 {
1258 	return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1259 }
1260 
1261 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1262 {
1263 	return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1264 }
1265 
1266 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1267 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1268 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1269 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1270 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1271 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1272 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1273 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1274 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1275 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1276 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1277 
1278 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1279 {
1280 	return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1281 }
1282 
1283 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1284 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1285 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1286 			 stripe_len, 64);
1287 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1288 			 io_align, 32);
1289 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1290 			 io_width, 32);
1291 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1292 			 sector_size, 32);
1293 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1294 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1295 			 num_stripes, 16);
1296 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1297 			 sub_stripes, 16);
1298 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1299 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1300 
1301 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1302 						   int nr)
1303 {
1304 	unsigned long offset = (unsigned long)c;
1305 	offset += offsetof(struct btrfs_chunk, stripe);
1306 	offset += nr * sizeof(struct btrfs_stripe);
1307 	return (struct btrfs_stripe *)offset;
1308 }
1309 
1310 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1311 {
1312 	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1313 }
1314 
1315 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1316 					 struct btrfs_chunk *c, int nr)
1317 {
1318 	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1319 }
1320 
1321 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1322 					     struct btrfs_chunk *c, int nr,
1323 					     u64 val)
1324 {
1325 	btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1326 }
1327 
1328 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1329 					 struct btrfs_chunk *c, int nr)
1330 {
1331 	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1332 }
1333 
1334 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1335 					     struct btrfs_chunk *c, int nr,
1336 					     u64 val)
1337 {
1338 	btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1339 }
1340 
1341 /* struct btrfs_block_group_item */
1342 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1343 			 used, 64);
1344 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1345 			 used, 64);
1346 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1347 			struct btrfs_block_group_item, chunk_objectid, 64);
1348 
1349 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1350 		   struct btrfs_block_group_item, chunk_objectid, 64);
1351 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1352 		   struct btrfs_block_group_item, flags, 64);
1353 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1354 			struct btrfs_block_group_item, flags, 64);
1355 
1356 /* struct btrfs_inode_ref */
1357 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1358 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1359 
1360 /* struct btrfs_inode_item */
1361 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1362 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1363 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1364 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1365 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1366 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1367 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1368 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1369 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1370 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1371 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1372 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1373 
1374 static inline struct btrfs_timespec *
1375 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1376 {
1377 	unsigned long ptr = (unsigned long)inode_item;
1378 	ptr += offsetof(struct btrfs_inode_item, atime);
1379 	return (struct btrfs_timespec *)ptr;
1380 }
1381 
1382 static inline struct btrfs_timespec *
1383 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1384 {
1385 	unsigned long ptr = (unsigned long)inode_item;
1386 	ptr += offsetof(struct btrfs_inode_item, mtime);
1387 	return (struct btrfs_timespec *)ptr;
1388 }
1389 
1390 static inline struct btrfs_timespec *
1391 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1392 {
1393 	unsigned long ptr = (unsigned long)inode_item;
1394 	ptr += offsetof(struct btrfs_inode_item, ctime);
1395 	return (struct btrfs_timespec *)ptr;
1396 }
1397 
1398 static inline struct btrfs_timespec *
1399 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1400 {
1401 	unsigned long ptr = (unsigned long)inode_item;
1402 	ptr += offsetof(struct btrfs_inode_item, otime);
1403 	return (struct btrfs_timespec *)ptr;
1404 }
1405 
1406 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1407 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1408 
1409 /* struct btrfs_dev_extent */
1410 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1411 		   chunk_tree, 64);
1412 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1413 		   chunk_objectid, 64);
1414 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1415 		   chunk_offset, 64);
1416 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1417 
1418 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1419 {
1420 	unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1421 	return (u8 *)((unsigned long)dev + ptr);
1422 }
1423 
1424 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1425 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1426 		   generation, 64);
1427 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1428 
1429 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1430 
1431 
1432 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1433 
1434 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1435 					struct btrfs_tree_block_info *item,
1436 					struct btrfs_disk_key *key)
1437 {
1438 	read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1439 }
1440 
1441 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1442 					    struct btrfs_tree_block_info *item,
1443 					    struct btrfs_disk_key *key)
1444 {
1445 	write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1446 }
1447 
1448 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1449 		   root, 64);
1450 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1451 		   objectid, 64);
1452 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1453 		   offset, 64);
1454 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1455 		   count, 32);
1456 
1457 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1458 		   count, 32);
1459 
1460 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1461 		   type, 8);
1462 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1463 		   offset, 64);
1464 
1465 static inline u32 btrfs_extent_inline_ref_size(int type)
1466 {
1467 	if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1468 	    type == BTRFS_SHARED_BLOCK_REF_KEY)
1469 		return sizeof(struct btrfs_extent_inline_ref);
1470 	if (type == BTRFS_SHARED_DATA_REF_KEY)
1471 		return sizeof(struct btrfs_shared_data_ref) +
1472 		       sizeof(struct btrfs_extent_inline_ref);
1473 	if (type == BTRFS_EXTENT_DATA_REF_KEY)
1474 		return sizeof(struct btrfs_extent_data_ref) +
1475 		       offsetof(struct btrfs_extent_inline_ref, offset);
1476 	BUG();
1477 	return 0;
1478 }
1479 
1480 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1481 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1482 		   generation, 64);
1483 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1484 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1485 
1486 /* struct btrfs_node */
1487 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1488 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1489 
1490 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1491 {
1492 	unsigned long ptr;
1493 	ptr = offsetof(struct btrfs_node, ptrs) +
1494 		sizeof(struct btrfs_key_ptr) * nr;
1495 	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1496 }
1497 
1498 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1499 					   int nr, u64 val)
1500 {
1501 	unsigned long ptr;
1502 	ptr = offsetof(struct btrfs_node, ptrs) +
1503 		sizeof(struct btrfs_key_ptr) * nr;
1504 	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1505 }
1506 
1507 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1508 {
1509 	unsigned long ptr;
1510 	ptr = offsetof(struct btrfs_node, ptrs) +
1511 		sizeof(struct btrfs_key_ptr) * nr;
1512 	return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1513 }
1514 
1515 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1516 						 int nr, u64 val)
1517 {
1518 	unsigned long ptr;
1519 	ptr = offsetof(struct btrfs_node, ptrs) +
1520 		sizeof(struct btrfs_key_ptr) * nr;
1521 	btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1522 }
1523 
1524 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1525 {
1526 	return offsetof(struct btrfs_node, ptrs) +
1527 		sizeof(struct btrfs_key_ptr) * nr;
1528 }
1529 
1530 void btrfs_node_key(struct extent_buffer *eb,
1531 		    struct btrfs_disk_key *disk_key, int nr);
1532 
1533 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1534 				      struct btrfs_disk_key *disk_key, int nr)
1535 {
1536 	unsigned long ptr;
1537 	ptr = btrfs_node_key_ptr_offset(nr);
1538 	write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1539 		       struct btrfs_key_ptr, key, disk_key);
1540 }
1541 
1542 /* struct btrfs_item */
1543 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1544 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1545 
1546 static inline unsigned long btrfs_item_nr_offset(int nr)
1547 {
1548 	return offsetof(struct btrfs_leaf, items) +
1549 		sizeof(struct btrfs_item) * nr;
1550 }
1551 
1552 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1553 					       int nr)
1554 {
1555 	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1556 }
1557 
1558 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1559 				 struct btrfs_item *item)
1560 {
1561 	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1562 }
1563 
1564 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1565 {
1566 	return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1567 }
1568 
1569 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1570 {
1571 	return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1572 }
1573 
1574 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1575 {
1576 	return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1577 }
1578 
1579 static inline void btrfs_item_key(struct extent_buffer *eb,
1580 			   struct btrfs_disk_key *disk_key, int nr)
1581 {
1582 	struct btrfs_item *item = btrfs_item_nr(eb, nr);
1583 	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1584 }
1585 
1586 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1587 			       struct btrfs_disk_key *disk_key, int nr)
1588 {
1589 	struct btrfs_item *item = btrfs_item_nr(eb, nr);
1590 	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1591 }
1592 
1593 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1594 
1595 /*
1596  * struct btrfs_root_ref
1597  */
1598 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1599 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1600 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1601 
1602 /* struct btrfs_dir_item */
1603 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1604 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1605 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1606 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1607 
1608 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1609 				      struct btrfs_dir_item *item,
1610 				      struct btrfs_disk_key *key)
1611 {
1612 	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1613 }
1614 
1615 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1616 					  struct btrfs_dir_item *item,
1617 					  struct btrfs_disk_key *key)
1618 {
1619 	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1620 }
1621 
1622 /* struct btrfs_disk_key */
1623 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1624 			 objectid, 64);
1625 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1626 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1627 
1628 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1629 					 struct btrfs_disk_key *disk)
1630 {
1631 	cpu->offset = le64_to_cpu(disk->offset);
1632 	cpu->type = disk->type;
1633 	cpu->objectid = le64_to_cpu(disk->objectid);
1634 }
1635 
1636 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1637 					 struct btrfs_key *cpu)
1638 {
1639 	disk->offset = cpu_to_le64(cpu->offset);
1640 	disk->type = cpu->type;
1641 	disk->objectid = cpu_to_le64(cpu->objectid);
1642 }
1643 
1644 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1645 				  struct btrfs_key *key, int nr)
1646 {
1647 	struct btrfs_disk_key disk_key;
1648 	btrfs_node_key(eb, &disk_key, nr);
1649 	btrfs_disk_key_to_cpu(key, &disk_key);
1650 }
1651 
1652 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1653 				  struct btrfs_key *key, int nr)
1654 {
1655 	struct btrfs_disk_key disk_key;
1656 	btrfs_item_key(eb, &disk_key, nr);
1657 	btrfs_disk_key_to_cpu(key, &disk_key);
1658 }
1659 
1660 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1661 				      struct btrfs_dir_item *item,
1662 				      struct btrfs_key *key)
1663 {
1664 	struct btrfs_disk_key disk_key;
1665 	btrfs_dir_item_key(eb, item, &disk_key);
1666 	btrfs_disk_key_to_cpu(key, &disk_key);
1667 }
1668 
1669 
1670 static inline u8 btrfs_key_type(struct btrfs_key *key)
1671 {
1672 	return key->type;
1673 }
1674 
1675 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1676 {
1677 	key->type = val;
1678 }
1679 
1680 /* struct btrfs_header */
1681 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1682 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1683 			  generation, 64);
1684 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1685 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1686 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1687 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1688 
1689 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1690 {
1691 	return (btrfs_header_flags(eb) & flag) == flag;
1692 }
1693 
1694 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1695 {
1696 	u64 flags = btrfs_header_flags(eb);
1697 	btrfs_set_header_flags(eb, flags | flag);
1698 	return (flags & flag) == flag;
1699 }
1700 
1701 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1702 {
1703 	u64 flags = btrfs_header_flags(eb);
1704 	btrfs_set_header_flags(eb, flags & ~flag);
1705 	return (flags & flag) == flag;
1706 }
1707 
1708 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1709 {
1710 	u64 flags = btrfs_header_flags(eb);
1711 	return flags >> BTRFS_BACKREF_REV_SHIFT;
1712 }
1713 
1714 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1715 						int rev)
1716 {
1717 	u64 flags = btrfs_header_flags(eb);
1718 	flags &= ~BTRFS_BACKREF_REV_MASK;
1719 	flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1720 	btrfs_set_header_flags(eb, flags);
1721 }
1722 
1723 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1724 {
1725 	unsigned long ptr = offsetof(struct btrfs_header, fsid);
1726 	return (u8 *)ptr;
1727 }
1728 
1729 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1730 {
1731 	unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1732 	return (u8 *)ptr;
1733 }
1734 
1735 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1736 {
1737 	unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1738 	return (u8 *)ptr;
1739 }
1740 
1741 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1742 {
1743 	unsigned long ptr = offsetof(struct btrfs_header, csum);
1744 	return (u8 *)ptr;
1745 }
1746 
1747 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1748 {
1749 	return NULL;
1750 }
1751 
1752 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1753 {
1754 	return NULL;
1755 }
1756 
1757 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1758 {
1759 	return NULL;
1760 }
1761 
1762 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1763 {
1764 	return btrfs_header_level(eb) == 0;
1765 }
1766 
1767 /* struct btrfs_root_item */
1768 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1769 		   generation, 64);
1770 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1771 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1772 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1773 
1774 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1775 			 generation, 64);
1776 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1777 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1778 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1779 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1780 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1781 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1782 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1783 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1784 			 last_snapshot, 64);
1785 
1786 /* struct btrfs_super_block */
1787 
1788 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1789 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1790 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1791 			 generation, 64);
1792 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1793 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1794 			 struct btrfs_super_block, sys_chunk_array_size, 32);
1795 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1796 			 struct btrfs_super_block, chunk_root_generation, 64);
1797 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1798 			 root_level, 8);
1799 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1800 			 chunk_root, 64);
1801 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1802 			 chunk_root_level, 8);
1803 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1804 			 log_root, 64);
1805 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1806 			 log_root_transid, 64);
1807 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1808 			 log_root_level, 8);
1809 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1810 			 total_bytes, 64);
1811 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1812 			 bytes_used, 64);
1813 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1814 			 sectorsize, 32);
1815 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1816 			 nodesize, 32);
1817 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1818 			 leafsize, 32);
1819 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1820 			 stripesize, 32);
1821 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1822 			 root_dir_objectid, 64);
1823 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1824 			 num_devices, 64);
1825 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1826 			 compat_flags, 64);
1827 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1828 			 compat_flags, 64);
1829 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1830 			 incompat_flags, 64);
1831 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1832 			 csum_type, 16);
1833 
1834 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1835 {
1836 	int t = btrfs_super_csum_type(s);
1837 	BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1838 	return btrfs_csum_sizes[t];
1839 }
1840 
1841 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1842 {
1843 	return offsetof(struct btrfs_leaf, items);
1844 }
1845 
1846 /* struct btrfs_file_extent_item */
1847 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1848 
1849 static inline unsigned long
1850 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
1851 {
1852 	unsigned long offset = (unsigned long)e;
1853 	offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1854 	return offset;
1855 }
1856 
1857 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1858 {
1859 	return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1860 }
1861 
1862 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1863 		   disk_bytenr, 64);
1864 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1865 		   generation, 64);
1866 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1867 		   disk_num_bytes, 64);
1868 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1869 		  offset, 64);
1870 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1871 		   num_bytes, 64);
1872 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1873 		   ram_bytes, 64);
1874 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1875 		   compression, 8);
1876 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1877 		   encryption, 8);
1878 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1879 		   other_encoding, 16);
1880 
1881 /* this returns the number of file bytes represented by the inline item.
1882  * If an item is compressed, this is the uncompressed size
1883  */
1884 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1885 					       struct btrfs_file_extent_item *e)
1886 {
1887 	return btrfs_file_extent_ram_bytes(eb, e);
1888 }
1889 
1890 /*
1891  * this returns the number of bytes used by the item on disk, minus the
1892  * size of any extent headers.  If a file is compressed on disk, this is
1893  * the compressed size
1894  */
1895 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1896 						    struct btrfs_item *e)
1897 {
1898 	unsigned long offset;
1899 	offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1900 	return btrfs_item_size(eb, e) - offset;
1901 }
1902 
1903 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1904 {
1905 	return sb->s_fs_info;
1906 }
1907 
1908 static inline int btrfs_set_root_name(struct btrfs_root *root,
1909 				      const char *name, int len)
1910 {
1911 	/* if we already have a name just free it */
1912 	kfree(root->name);
1913 
1914 	root->name = kmalloc(len+1, GFP_KERNEL);
1915 	if (!root->name)
1916 		return -ENOMEM;
1917 
1918 	memcpy(root->name, name, len);
1919 	root->name[len] = '\0';
1920 
1921 	return 0;
1922 }
1923 
1924 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
1925 {
1926 	if (level == 0)
1927 		return root->leafsize;
1928 	return root->nodesize;
1929 }
1930 
1931 /* helper function to cast into the data area of the leaf. */
1932 #define btrfs_item_ptr(leaf, slot, type) \
1933 	((type *)(btrfs_leaf_data(leaf) + \
1934 	btrfs_item_offset_nr(leaf, slot)))
1935 
1936 #define btrfs_item_ptr_offset(leaf, slot) \
1937 	((unsigned long)(btrfs_leaf_data(leaf) + \
1938 	btrfs_item_offset_nr(leaf, slot)))
1939 
1940 static inline struct dentry *fdentry(struct file *file)
1941 {
1942 	return file->f_path.dentry;
1943 }
1944 
1945 /* extent-tree.c */
1946 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1947 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
1948 			   struct btrfs_root *root, unsigned long count);
1949 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
1950 int btrfs_pin_extent(struct btrfs_root *root,
1951 		     u64 bytenr, u64 num, int reserved);
1952 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
1953 			struct btrfs_root *root, struct extent_buffer *leaf);
1954 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1955 			  struct btrfs_root *root,
1956 			  u64 objectid, u64 offset, u64 bytenr);
1957 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1958 struct btrfs_block_group_cache *btrfs_lookup_block_group(
1959 						 struct btrfs_fs_info *info,
1960 						 u64 bytenr);
1961 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1962 u64 btrfs_find_block_group(struct btrfs_root *root,
1963 			   u64 search_start, u64 search_hint, int owner);
1964 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1965 					struct btrfs_root *root, u32 blocksize,
1966 					u64 parent, u64 root_objectid,
1967 					struct btrfs_disk_key *key, int level,
1968 					u64 hint, u64 empty_size);
1969 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
1970 					    struct btrfs_root *root,
1971 					    u64 bytenr, u32 blocksize,
1972 					    int level);
1973 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
1974 				     struct btrfs_root *root,
1975 				     u64 root_objectid, u64 owner,
1976 				     u64 offset, struct btrfs_key *ins);
1977 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
1978 				   struct btrfs_root *root,
1979 				   u64 root_objectid, u64 owner, u64 offset,
1980 				   struct btrfs_key *ins);
1981 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
1982 				  struct btrfs_root *root,
1983 				  u64 num_bytes, u64 min_alloc_size,
1984 				  u64 empty_size, u64 hint_byte,
1985 				  u64 search_end, struct btrfs_key *ins,
1986 				  u64 data);
1987 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1988 		  struct extent_buffer *buf, int full_backref);
1989 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1990 		  struct extent_buffer *buf, int full_backref);
1991 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
1992 				struct btrfs_root *root,
1993 				u64 bytenr, u64 num_bytes, u64 flags,
1994 				int is_data);
1995 int btrfs_free_extent(struct btrfs_trans_handle *trans,
1996 		      struct btrfs_root *root,
1997 		      u64 bytenr, u64 num_bytes, u64 parent,
1998 		      u64 root_objectid, u64 owner, u64 offset);
1999 
2000 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2001 int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2002 				struct btrfs_root *root);
2003 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2004 			       struct btrfs_root *root);
2005 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2006 			 struct btrfs_root *root,
2007 			 u64 bytenr, u64 num_bytes, u64 parent,
2008 			 u64 root_objectid, u64 owner, u64 offset);
2009 
2010 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2011 				    struct btrfs_root *root);
2012 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
2013 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2014 int btrfs_read_block_groups(struct btrfs_root *root);
2015 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
2016 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2017 			   struct btrfs_root *root, u64 bytes_used,
2018 			   u64 type, u64 chunk_objectid, u64 chunk_offset,
2019 			   u64 size);
2020 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2021 			     struct btrfs_root *root, u64 group_start);
2022 int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
2023 				struct btrfs_block_group_cache *group);
2024 
2025 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2026 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
2027 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2028 
2029 int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items);
2030 int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items);
2031 int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root,
2032 					  struct inode *inode, int num_items);
2033 int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root,
2034 					struct inode *inode, int num_items);
2035 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
2036 				u64 bytes);
2037 void btrfs_free_reserved_data_space(struct btrfs_root *root,
2038 				    struct inode *inode, u64 bytes);
2039 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
2040 				 u64 bytes);
2041 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
2042 			      u64 bytes);
2043 /* ctree.c */
2044 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2045 		     int level, int *slot);
2046 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2047 int btrfs_previous_item(struct btrfs_root *root,
2048 			struct btrfs_path *path, u64 min_objectid,
2049 			int type);
2050 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2051 			    struct btrfs_root *root, struct btrfs_path *path,
2052 			    struct btrfs_key *new_key);
2053 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2054 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2055 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2056 			struct btrfs_key *key, int lowest_level,
2057 			int cache_only, u64 min_trans);
2058 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2059 			 struct btrfs_key *max_key,
2060 			 struct btrfs_path *path, int cache_only,
2061 			 u64 min_trans);
2062 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2063 		    struct btrfs_root *root, struct extent_buffer *buf,
2064 		    struct extent_buffer *parent, int parent_slot,
2065 		    struct extent_buffer **cow_ret);
2066 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2067 		      struct btrfs_root *root,
2068 		      struct extent_buffer *buf,
2069 		      struct extent_buffer **cow_ret, u64 new_root_objectid);
2070 int btrfs_block_can_be_shared(struct btrfs_root *root,
2071 			      struct extent_buffer *buf);
2072 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2073 		      *root, struct btrfs_path *path, u32 data_size);
2074 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2075 			struct btrfs_root *root,
2076 			struct btrfs_path *path,
2077 			u32 new_size, int from_end);
2078 int btrfs_split_item(struct btrfs_trans_handle *trans,
2079 		     struct btrfs_root *root,
2080 		     struct btrfs_path *path,
2081 		     struct btrfs_key *new_key,
2082 		     unsigned long split_offset);
2083 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2084 		      *root, struct btrfs_key *key, struct btrfs_path *p, int
2085 		      ins_len, int cow);
2086 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2087 		       struct btrfs_root *root, struct extent_buffer *parent,
2088 		       int start_slot, int cache_only, u64 *last_ret,
2089 		       struct btrfs_key *progress);
2090 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2091 struct btrfs_path *btrfs_alloc_path(void);
2092 void btrfs_free_path(struct btrfs_path *p);
2093 void btrfs_set_path_blocking(struct btrfs_path *p);
2094 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2095 
2096 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2097 		   struct btrfs_path *path, int slot, int nr);
2098 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2099 				 struct btrfs_root *root,
2100 				 struct btrfs_path *path)
2101 {
2102 	return btrfs_del_items(trans, root, path, path->slots[0], 1);
2103 }
2104 
2105 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2106 		      *root, struct btrfs_key *key, void *data, u32 data_size);
2107 int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
2108 			    struct btrfs_root *root,
2109 			    struct btrfs_path *path,
2110 			    struct btrfs_key *cpu_key, u32 *data_size,
2111 			    int nr);
2112 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2113 			     struct btrfs_root *root,
2114 			     struct btrfs_path *path,
2115 			     struct btrfs_key *cpu_key, u32 *data_size, int nr);
2116 
2117 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2118 					  struct btrfs_root *root,
2119 					  struct btrfs_path *path,
2120 					  struct btrfs_key *key,
2121 					  u32 data_size)
2122 {
2123 	return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2124 }
2125 
2126 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2127 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2128 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2129 int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref);
2130 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2131 			struct btrfs_root *root,
2132 			struct extent_buffer *node,
2133 			struct extent_buffer *parent);
2134 /* root-item.c */
2135 int btrfs_find_root_ref(struct btrfs_root *tree_root,
2136 			struct btrfs_path *path,
2137 			u64 root_id, u64 ref_id);
2138 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2139 		       struct btrfs_root *tree_root,
2140 		       u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2141 		       const char *name, int name_len);
2142 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2143 		       struct btrfs_root *tree_root,
2144 		       u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2145 		       const char *name, int name_len);
2146 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2147 		   struct btrfs_key *key);
2148 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2149 		      *root, struct btrfs_key *key, struct btrfs_root_item
2150 		      *item);
2151 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2152 		      *root, struct btrfs_key *key, struct btrfs_root_item
2153 		      *item);
2154 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2155 			 btrfs_root_item *item, struct btrfs_key *key);
2156 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
2157 		      u64 *found_objectid);
2158 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2159 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
2160 int btrfs_set_root_node(struct btrfs_root_item *item,
2161 			struct extent_buffer *node);
2162 /* dir-item.c */
2163 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2164 			  struct btrfs_root *root, const char *name,
2165 			  int name_len, u64 dir,
2166 			  struct btrfs_key *location, u8 type, u64 index);
2167 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2168 					     struct btrfs_root *root,
2169 					     struct btrfs_path *path, u64 dir,
2170 					     const char *name, int name_len,
2171 					     int mod);
2172 struct btrfs_dir_item *
2173 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2174 			    struct btrfs_root *root,
2175 			    struct btrfs_path *path, u64 dir,
2176 			    u64 objectid, const char *name, int name_len,
2177 			    int mod);
2178 struct btrfs_dir_item *
2179 btrfs_search_dir_index_item(struct btrfs_root *root,
2180 			    struct btrfs_path *path, u64 dirid,
2181 			    const char *name, int name_len);
2182 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2183 			      struct btrfs_path *path,
2184 			      const char *name, int name_len);
2185 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2186 			      struct btrfs_root *root,
2187 			      struct btrfs_path *path,
2188 			      struct btrfs_dir_item *di);
2189 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2190 			    struct btrfs_root *root, const char *name,
2191 			    u16 name_len, const void *data, u16 data_len,
2192 			    u64 dir);
2193 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2194 					  struct btrfs_root *root,
2195 					  struct btrfs_path *path, u64 dir,
2196 					  const char *name, u16 name_len,
2197 					  int mod);
2198 
2199 /* orphan.c */
2200 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2201 			     struct btrfs_root *root, u64 offset);
2202 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2203 			  struct btrfs_root *root, u64 offset);
2204 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
2205 
2206 /* inode-map.c */
2207 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2208 			     struct btrfs_root *fs_root,
2209 			     u64 dirid, u64 *objectid);
2210 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2211 
2212 /* inode-item.c */
2213 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2214 			   struct btrfs_root *root,
2215 			   const char *name, int name_len,
2216 			   u64 inode_objectid, u64 ref_objectid, u64 index);
2217 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2218 			   struct btrfs_root *root,
2219 			   const char *name, int name_len,
2220 			   u64 inode_objectid, u64 ref_objectid, u64 *index);
2221 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2222 			     struct btrfs_root *root,
2223 			     struct btrfs_path *path, u64 objectid);
2224 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2225 		       *root, struct btrfs_path *path,
2226 		       struct btrfs_key *location, int mod);
2227 
2228 /* file-item.c */
2229 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2230 		    struct btrfs_root *root, u64 bytenr, u64 len);
2231 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2232 			  struct bio *bio, u32 *dst);
2233 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2234 			     struct btrfs_root *root,
2235 			     u64 objectid, u64 pos,
2236 			     u64 disk_offset, u64 disk_num_bytes,
2237 			     u64 num_bytes, u64 offset, u64 ram_bytes,
2238 			     u8 compression, u8 encryption, u16 other_encoding);
2239 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2240 			     struct btrfs_root *root,
2241 			     struct btrfs_path *path, u64 objectid,
2242 			     u64 bytenr, int mod);
2243 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2244 			   struct btrfs_root *root,
2245 			   struct btrfs_ordered_sum *sums);
2246 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2247 		       struct bio *bio, u64 file_start, int contig);
2248 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
2249 			  u64 start, unsigned long len);
2250 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2251 					  struct btrfs_root *root,
2252 					  struct btrfs_path *path,
2253 					  u64 bytenr, int cow);
2254 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2255 			struct btrfs_root *root, struct btrfs_path *path,
2256 			u64 isize);
2257 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
2258 			     u64 end, struct list_head *list);
2259 /* inode.c */
2260 
2261 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2262 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2263 #define ClearPageChecked ClearPageFsMisc
2264 #define SetPageChecked SetPageFsMisc
2265 #define PageChecked PageFsMisc
2266 #endif
2267 
2268 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2269 int btrfs_set_inode_index(struct inode *dir, u64 *index);
2270 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2271 		       struct btrfs_root *root,
2272 		       struct inode *dir, struct inode *inode,
2273 		       const char *name, int name_len);
2274 int btrfs_add_link(struct btrfs_trans_handle *trans,
2275 		   struct inode *parent_inode, struct inode *inode,
2276 		   const char *name, int name_len, int add_backref, u64 index);
2277 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
2278 			struct btrfs_root *root,
2279 			struct inode *dir, u64 objectid,
2280 			const char *name, int name_len);
2281 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2282 			       struct btrfs_root *root,
2283 			       struct inode *inode, u64 new_size,
2284 			       u32 min_type);
2285 
2286 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
2287 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
2288 int btrfs_writepages(struct address_space *mapping,
2289 		     struct writeback_control *wbc);
2290 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2291 			     struct btrfs_root *new_root,
2292 			     u64 new_dirid, u64 alloc_hint);
2293 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2294 			 size_t size, struct bio *bio, unsigned long bio_flags);
2295 
2296 unsigned long btrfs_force_ra(struct address_space *mapping,
2297 			      struct file_ra_state *ra, struct file *file,
2298 			      pgoff_t offset, pgoff_t last_index);
2299 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2300 int btrfs_readpage(struct file *file, struct page *page);
2301 void btrfs_delete_inode(struct inode *inode);
2302 void btrfs_put_inode(struct inode *inode);
2303 int btrfs_write_inode(struct inode *inode, int wait);
2304 void btrfs_dirty_inode(struct inode *inode);
2305 struct inode *btrfs_alloc_inode(struct super_block *sb);
2306 void btrfs_destroy_inode(struct inode *inode);
2307 void btrfs_drop_inode(struct inode *inode);
2308 int btrfs_init_cachep(void);
2309 void btrfs_destroy_cachep(void);
2310 long btrfs_ioctl_trans_end(struct file *file);
2311 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2312 			 struct btrfs_root *root);
2313 int btrfs_commit_write(struct file *file, struct page *page,
2314 		       unsigned from, unsigned to);
2315 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2316 				    size_t page_offset, u64 start, u64 end,
2317 				    int create);
2318 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2319 			      struct btrfs_root *root,
2320 			      struct inode *inode);
2321 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2322 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2323 void btrfs_orphan_cleanup(struct btrfs_root *root);
2324 int btrfs_cont_expand(struct inode *inode, loff_t size);
2325 int btrfs_invalidate_inodes(struct btrfs_root *root);
2326 extern struct dentry_operations btrfs_dentry_operations;
2327 
2328 /* ioctl.c */
2329 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2330 void btrfs_update_iflags(struct inode *inode);
2331 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
2332 
2333 /* file.c */
2334 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
2335 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2336 			    int skip_pinned);
2337 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
2338 extern const struct file_operations btrfs_file_operations;
2339 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
2340 		       struct btrfs_root *root, struct inode *inode,
2341 		       u64 start, u64 end, u64 locked_end,
2342 		       u64 inline_limit, u64 *hint_block, int drop_cache);
2343 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2344 			      struct btrfs_root *root,
2345 			      struct inode *inode, u64 start, u64 end);
2346 int btrfs_release_file(struct inode *inode, struct file *file);
2347 
2348 /* tree-defrag.c */
2349 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2350 			struct btrfs_root *root, int cache_only);
2351 
2352 /* sysfs.c */
2353 int btrfs_init_sysfs(void);
2354 void btrfs_exit_sysfs(void);
2355 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2356 int btrfs_sysfs_add_root(struct btrfs_root *root);
2357 void btrfs_sysfs_del_root(struct btrfs_root *root);
2358 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2359 
2360 /* xattr.c */
2361 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2362 
2363 /* super.c */
2364 u64 btrfs_parse_size(char *str);
2365 int btrfs_parse_options(struct btrfs_root *root, char *options);
2366 int btrfs_sync_fs(struct super_block *sb, int wait);
2367 
2368 /* acl.c */
2369 #ifdef CONFIG_BTRFS_POSIX_ACL
2370 int btrfs_check_acl(struct inode *inode, int mask);
2371 #else
2372 #define btrfs_check_acl NULL
2373 #endif
2374 int btrfs_init_acl(struct inode *inode, struct inode *dir);
2375 int btrfs_acl_chmod(struct inode *inode);
2376 
2377 /* relocation.c */
2378 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
2379 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
2380 			  struct btrfs_root *root);
2381 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
2382 			    struct btrfs_root *root);
2383 int btrfs_recover_relocation(struct btrfs_root *root);
2384 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
2385 #endif
2386