xref: /openbmc/linux/fs/btrfs/ctree.h (revision 7bcae826)
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/mm.h>
23 #include <linux/highmem.h>
24 #include <linux/fs.h>
25 #include <linux/rwsem.h>
26 #include <linux/semaphore.h>
27 #include <linux/completion.h>
28 #include <linux/backing-dev.h>
29 #include <linux/wait.h>
30 #include <linux/slab.h>
31 #include <linux/kobject.h>
32 #include <trace/events/btrfs.h>
33 #include <asm/kmap_types.h>
34 #include <linux/pagemap.h>
35 #include <linux/btrfs.h>
36 #include <linux/btrfs_tree.h>
37 #include <linux/workqueue.h>
38 #include <linux/security.h>
39 #include <linux/sizes.h>
40 #include <linux/dynamic_debug.h>
41 #include "extent_io.h"
42 #include "extent_map.h"
43 #include "async-thread.h"
44 
45 struct btrfs_trans_handle;
46 struct btrfs_transaction;
47 struct btrfs_pending_snapshot;
48 extern struct kmem_cache *btrfs_trans_handle_cachep;
49 extern struct kmem_cache *btrfs_transaction_cachep;
50 extern struct kmem_cache *btrfs_bit_radix_cachep;
51 extern struct kmem_cache *btrfs_path_cachep;
52 extern struct kmem_cache *btrfs_free_space_cachep;
53 struct btrfs_ordered_sum;
54 
55 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
56 #define STATIC noinline
57 #else
58 #define STATIC static noinline
59 #endif
60 
61 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
62 
63 #define BTRFS_MAX_MIRRORS 3
64 
65 #define BTRFS_MAX_LEVEL 8
66 
67 #define BTRFS_COMPAT_EXTENT_TREE_V0
68 
69 /*
70  * the max metadata block size.  This limit is somewhat artificial,
71  * but the memmove costs go through the roof for larger blocks.
72  */
73 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
74 
75 /*
76  * we can actually store much bigger names, but lets not confuse the rest
77  * of linux
78  */
79 #define BTRFS_NAME_LEN 255
80 
81 /*
82  * Theoretical limit is larger, but we keep this down to a sane
83  * value. That should limit greatly the possibility of collisions on
84  * inode ref items.
85  */
86 #define BTRFS_LINK_MAX 65535U
87 
88 static const int btrfs_csum_sizes[] = { 4 };
89 
90 /* four bytes for CRC32 */
91 #define BTRFS_EMPTY_DIR_SIZE 0
92 
93 /* ioprio of readahead is set to idle */
94 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
95 
96 #define BTRFS_DIRTY_METADATA_THRESH	SZ_32M
97 
98 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
99 
100 /*
101  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
102  */
103 static inline u32 count_max_extents(u64 size)
104 {
105 	return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
106 }
107 
108 struct btrfs_mapping_tree {
109 	struct extent_map_tree map_tree;
110 };
111 
112 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
113 {
114 	BUG_ON(num_stripes == 0);
115 	return sizeof(struct btrfs_chunk) +
116 		sizeof(struct btrfs_stripe) * (num_stripes - 1);
117 }
118 
119 /*
120  * File system states
121  */
122 #define BTRFS_FS_STATE_ERROR		0
123 #define BTRFS_FS_STATE_REMOUNTING	1
124 #define BTRFS_FS_STATE_TRANS_ABORTED	2
125 #define BTRFS_FS_STATE_DEV_REPLACING	3
126 #define BTRFS_FS_STATE_DUMMY_FS_INFO	4
127 
128 #define BTRFS_BACKREF_REV_MAX		256
129 #define BTRFS_BACKREF_REV_SHIFT		56
130 #define BTRFS_BACKREF_REV_MASK		(((u64)BTRFS_BACKREF_REV_MAX - 1) << \
131 					 BTRFS_BACKREF_REV_SHIFT)
132 
133 #define BTRFS_OLD_BACKREF_REV		0
134 #define BTRFS_MIXED_BACKREF_REV		1
135 
136 /*
137  * every tree block (leaf or node) starts with this header.
138  */
139 struct btrfs_header {
140 	/* these first four must match the super block */
141 	u8 csum[BTRFS_CSUM_SIZE];
142 	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
143 	__le64 bytenr; /* which block this node is supposed to live in */
144 	__le64 flags;
145 
146 	/* allowed to be different from the super from here on down */
147 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
148 	__le64 generation;
149 	__le64 owner;
150 	__le32 nritems;
151 	u8 level;
152 } __attribute__ ((__packed__));
153 
154 /*
155  * this is a very generous portion of the super block, giving us
156  * room to translate 14 chunks with 3 stripes each.
157  */
158 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
159 
160 /*
161  * just in case we somehow lose the roots and are not able to mount,
162  * we store an array of the roots from previous transactions
163  * in the super.
164  */
165 #define BTRFS_NUM_BACKUP_ROOTS 4
166 struct btrfs_root_backup {
167 	__le64 tree_root;
168 	__le64 tree_root_gen;
169 
170 	__le64 chunk_root;
171 	__le64 chunk_root_gen;
172 
173 	__le64 extent_root;
174 	__le64 extent_root_gen;
175 
176 	__le64 fs_root;
177 	__le64 fs_root_gen;
178 
179 	__le64 dev_root;
180 	__le64 dev_root_gen;
181 
182 	__le64 csum_root;
183 	__le64 csum_root_gen;
184 
185 	__le64 total_bytes;
186 	__le64 bytes_used;
187 	__le64 num_devices;
188 	/* future */
189 	__le64 unused_64[4];
190 
191 	u8 tree_root_level;
192 	u8 chunk_root_level;
193 	u8 extent_root_level;
194 	u8 fs_root_level;
195 	u8 dev_root_level;
196 	u8 csum_root_level;
197 	/* future and to align */
198 	u8 unused_8[10];
199 } __attribute__ ((__packed__));
200 
201 /*
202  * the super block basically lists the main trees of the FS
203  * it currently lacks any block count etc etc
204  */
205 struct btrfs_super_block {
206 	u8 csum[BTRFS_CSUM_SIZE];
207 	/* the first 4 fields must match struct btrfs_header */
208 	u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
209 	__le64 bytenr; /* this block number */
210 	__le64 flags;
211 
212 	/* allowed to be different from the btrfs_header from here own down */
213 	__le64 magic;
214 	__le64 generation;
215 	__le64 root;
216 	__le64 chunk_root;
217 	__le64 log_root;
218 
219 	/* this will help find the new super based on the log root */
220 	__le64 log_root_transid;
221 	__le64 total_bytes;
222 	__le64 bytes_used;
223 	__le64 root_dir_objectid;
224 	__le64 num_devices;
225 	__le32 sectorsize;
226 	__le32 nodesize;
227 	__le32 __unused_leafsize;
228 	__le32 stripesize;
229 	__le32 sys_chunk_array_size;
230 	__le64 chunk_root_generation;
231 	__le64 compat_flags;
232 	__le64 compat_ro_flags;
233 	__le64 incompat_flags;
234 	__le16 csum_type;
235 	u8 root_level;
236 	u8 chunk_root_level;
237 	u8 log_root_level;
238 	struct btrfs_dev_item dev_item;
239 
240 	char label[BTRFS_LABEL_SIZE];
241 
242 	__le64 cache_generation;
243 	__le64 uuid_tree_generation;
244 
245 	/* future expansion */
246 	__le64 reserved[30];
247 	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
248 	struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
249 } __attribute__ ((__packed__));
250 
251 /*
252  * Compat flags that we support.  If any incompat flags are set other than the
253  * ones specified below then we will fail to mount
254  */
255 #define BTRFS_FEATURE_COMPAT_SUPP		0ULL
256 #define BTRFS_FEATURE_COMPAT_SAFE_SET		0ULL
257 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR		0ULL
258 
259 #define BTRFS_FEATURE_COMPAT_RO_SUPP			\
260 	(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |	\
261 	 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
262 
263 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET	0ULL
264 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR	0ULL
265 
266 #define BTRFS_FEATURE_INCOMPAT_SUPP			\
267 	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |		\
268 	 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |	\
269 	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
270 	 BTRFS_FEATURE_INCOMPAT_BIG_METADATA |		\
271 	 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |		\
272 	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
273 	 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
274 	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
275 	 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
276 
277 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET			\
278 	(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
279 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR		0ULL
280 
281 /*
282  * A leaf is full of items. offset and size tell us where to find
283  * the item in the leaf (relative to the start of the data area)
284  */
285 struct btrfs_item {
286 	struct btrfs_disk_key key;
287 	__le32 offset;
288 	__le32 size;
289 } __attribute__ ((__packed__));
290 
291 /*
292  * leaves have an item area and a data area:
293  * [item0, item1....itemN] [free space] [dataN...data1, data0]
294  *
295  * The data is separate from the items to get the keys closer together
296  * during searches.
297  */
298 struct btrfs_leaf {
299 	struct btrfs_header header;
300 	struct btrfs_item items[];
301 } __attribute__ ((__packed__));
302 
303 /*
304  * all non-leaf blocks are nodes, they hold only keys and pointers to
305  * other blocks
306  */
307 struct btrfs_key_ptr {
308 	struct btrfs_disk_key key;
309 	__le64 blockptr;
310 	__le64 generation;
311 } __attribute__ ((__packed__));
312 
313 struct btrfs_node {
314 	struct btrfs_header header;
315 	struct btrfs_key_ptr ptrs[];
316 } __attribute__ ((__packed__));
317 
318 /*
319  * btrfs_paths remember the path taken from the root down to the leaf.
320  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
321  * to any other levels that are present.
322  *
323  * The slots array records the index of the item or block pointer
324  * used while walking the tree.
325  */
326 enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
327 struct btrfs_path {
328 	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
329 	int slots[BTRFS_MAX_LEVEL];
330 	/* if there is real range locking, this locks field will change */
331 	u8 locks[BTRFS_MAX_LEVEL];
332 	u8 reada;
333 	/* keep some upper locks as we walk down */
334 	u8 lowest_level;
335 
336 	/*
337 	 * set by btrfs_split_item, tells search_slot to keep all locks
338 	 * and to force calls to keep space in the nodes
339 	 */
340 	unsigned int search_for_split:1;
341 	unsigned int keep_locks:1;
342 	unsigned int skip_locking:1;
343 	unsigned int leave_spinning:1;
344 	unsigned int search_commit_root:1;
345 	unsigned int need_commit_sem:1;
346 	unsigned int skip_release_on_error:1;
347 };
348 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
349 					sizeof(struct btrfs_item))
350 struct btrfs_dev_replace {
351 	u64 replace_state;	/* see #define above */
352 	u64 time_started;	/* seconds since 1-Jan-1970 */
353 	u64 time_stopped;	/* seconds since 1-Jan-1970 */
354 	atomic64_t num_write_errors;
355 	atomic64_t num_uncorrectable_read_errors;
356 
357 	u64 cursor_left;
358 	u64 committed_cursor_left;
359 	u64 cursor_left_last_write_of_item;
360 	u64 cursor_right;
361 
362 	u64 cont_reading_from_srcdev_mode;	/* see #define above */
363 
364 	int is_valid;
365 	int item_needs_writeback;
366 	struct btrfs_device *srcdev;
367 	struct btrfs_device *tgtdev;
368 
369 	pid_t lock_owner;
370 	atomic_t nesting_level;
371 	struct mutex lock_finishing_cancel_unmount;
372 	rwlock_t lock;
373 	atomic_t read_locks;
374 	atomic_t blocking_readers;
375 	wait_queue_head_t read_lock_wq;
376 
377 	struct btrfs_scrub_progress scrub_progress;
378 };
379 
380 /* For raid type sysfs entries */
381 struct raid_kobject {
382 	int raid_type;
383 	struct kobject kobj;
384 };
385 
386 struct btrfs_space_info {
387 	spinlock_t lock;
388 
389 	u64 total_bytes;	/* total bytes in the space,
390 				   this doesn't take mirrors into account */
391 	u64 bytes_used;		/* total bytes used,
392 				   this doesn't take mirrors into account */
393 	u64 bytes_pinned;	/* total bytes pinned, will be freed when the
394 				   transaction finishes */
395 	u64 bytes_reserved;	/* total bytes the allocator has reserved for
396 				   current allocations */
397 	u64 bytes_may_use;	/* number of bytes that may be used for
398 				   delalloc/allocations */
399 	u64 bytes_readonly;	/* total bytes that are read only */
400 
401 	u64 max_extent_size;	/* This will hold the maximum extent size of
402 				   the space info if we had an ENOSPC in the
403 				   allocator. */
404 
405 	unsigned int full:1;	/* indicates that we cannot allocate any more
406 				   chunks for this space */
407 	unsigned int chunk_alloc:1;	/* set if we are allocating a chunk */
408 
409 	unsigned int flush:1;		/* set if we are trying to make space */
410 
411 	unsigned int force_alloc;	/* set if we need to force a chunk
412 					   alloc for this space */
413 
414 	u64 disk_used;		/* total bytes used on disk */
415 	u64 disk_total;		/* total bytes on disk, takes mirrors into
416 				   account */
417 
418 	u64 flags;
419 
420 	/*
421 	 * bytes_pinned is kept in line with what is actually pinned, as in
422 	 * we've called update_block_group and dropped the bytes_used counter
423 	 * and increased the bytes_pinned counter.  However this means that
424 	 * bytes_pinned does not reflect the bytes that will be pinned once the
425 	 * delayed refs are flushed, so this counter is inc'ed every time we
426 	 * call btrfs_free_extent so it is a realtime count of what will be
427 	 * freed once the transaction is committed.  It will be zeroed every
428 	 * time the transaction commits.
429 	 */
430 	struct percpu_counter total_bytes_pinned;
431 
432 	struct list_head list;
433 	/* Protected by the spinlock 'lock'. */
434 	struct list_head ro_bgs;
435 	struct list_head priority_tickets;
436 	struct list_head tickets;
437 	/*
438 	 * tickets_id just indicates the next ticket will be handled, so note
439 	 * it's not stored per ticket.
440 	 */
441 	u64 tickets_id;
442 
443 	struct rw_semaphore groups_sem;
444 	/* for block groups in our same type */
445 	struct list_head block_groups[BTRFS_NR_RAID_TYPES];
446 	wait_queue_head_t wait;
447 
448 	struct kobject kobj;
449 	struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
450 };
451 
452 #define	BTRFS_BLOCK_RSV_GLOBAL		1
453 #define	BTRFS_BLOCK_RSV_DELALLOC	2
454 #define	BTRFS_BLOCK_RSV_TRANS		3
455 #define	BTRFS_BLOCK_RSV_CHUNK		4
456 #define	BTRFS_BLOCK_RSV_DELOPS		5
457 #define	BTRFS_BLOCK_RSV_EMPTY		6
458 #define	BTRFS_BLOCK_RSV_TEMP		7
459 
460 struct btrfs_block_rsv {
461 	u64 size;
462 	u64 reserved;
463 	struct btrfs_space_info *space_info;
464 	spinlock_t lock;
465 	unsigned short full;
466 	unsigned short type;
467 	unsigned short failfast;
468 };
469 
470 /*
471  * free clusters are used to claim free space in relatively large chunks,
472  * allowing us to do less seeky writes.  They are used for all metadata
473  * allocations and data allocations in ssd mode.
474  */
475 struct btrfs_free_cluster {
476 	spinlock_t lock;
477 	spinlock_t refill_lock;
478 	struct rb_root root;
479 
480 	/* largest extent in this cluster */
481 	u64 max_size;
482 
483 	/* first extent starting offset */
484 	u64 window_start;
485 
486 	/* We did a full search and couldn't create a cluster */
487 	bool fragmented;
488 
489 	struct btrfs_block_group_cache *block_group;
490 	/*
491 	 * when a cluster is allocated from a block group, we put the
492 	 * cluster onto a list in the block group so that it can
493 	 * be freed before the block group is freed.
494 	 */
495 	struct list_head block_group_list;
496 };
497 
498 enum btrfs_caching_type {
499 	BTRFS_CACHE_NO		= 0,
500 	BTRFS_CACHE_STARTED	= 1,
501 	BTRFS_CACHE_FAST	= 2,
502 	BTRFS_CACHE_FINISHED	= 3,
503 	BTRFS_CACHE_ERROR	= 4,
504 };
505 
506 enum btrfs_disk_cache_state {
507 	BTRFS_DC_WRITTEN	= 0,
508 	BTRFS_DC_ERROR		= 1,
509 	BTRFS_DC_CLEAR		= 2,
510 	BTRFS_DC_SETUP		= 3,
511 };
512 
513 struct btrfs_caching_control {
514 	struct list_head list;
515 	struct mutex mutex;
516 	wait_queue_head_t wait;
517 	struct btrfs_work work;
518 	struct btrfs_block_group_cache *block_group;
519 	u64 progress;
520 	atomic_t count;
521 };
522 
523 /* Once caching_thread() finds this much free space, it will wake up waiters. */
524 #define CACHING_CTL_WAKE_UP (1024 * 1024 * 2)
525 
526 struct btrfs_io_ctl {
527 	void *cur, *orig;
528 	struct page *page;
529 	struct page **pages;
530 	struct btrfs_fs_info *fs_info;
531 	struct inode *inode;
532 	unsigned long size;
533 	int index;
534 	int num_pages;
535 	int entries;
536 	int bitmaps;
537 	unsigned check_crcs:1;
538 };
539 
540 struct btrfs_block_group_cache {
541 	struct btrfs_key key;
542 	struct btrfs_block_group_item item;
543 	struct btrfs_fs_info *fs_info;
544 	struct inode *inode;
545 	spinlock_t lock;
546 	u64 pinned;
547 	u64 reserved;
548 	u64 delalloc_bytes;
549 	u64 bytes_super;
550 	u64 flags;
551 	u64 cache_generation;
552 	u32 sectorsize;
553 
554 	/*
555 	 * If the free space extent count exceeds this number, convert the block
556 	 * group to bitmaps.
557 	 */
558 	u32 bitmap_high_thresh;
559 
560 	/*
561 	 * If the free space extent count drops below this number, convert the
562 	 * block group back to extents.
563 	 */
564 	u32 bitmap_low_thresh;
565 
566 	/*
567 	 * It is just used for the delayed data space allocation because
568 	 * only the data space allocation and the relative metadata update
569 	 * can be done cross the transaction.
570 	 */
571 	struct rw_semaphore data_rwsem;
572 
573 	/* for raid56, this is a full stripe, without parity */
574 	unsigned long full_stripe_len;
575 
576 	unsigned int ro;
577 	unsigned int iref:1;
578 	unsigned int has_caching_ctl:1;
579 	unsigned int removed:1;
580 
581 	int disk_cache_state;
582 
583 	/* cache tracking stuff */
584 	int cached;
585 	struct btrfs_caching_control *caching_ctl;
586 	u64 last_byte_to_unpin;
587 
588 	struct btrfs_space_info *space_info;
589 
590 	/* free space cache stuff */
591 	struct btrfs_free_space_ctl *free_space_ctl;
592 
593 	/* block group cache stuff */
594 	struct rb_node cache_node;
595 
596 	/* for block groups in the same raid type */
597 	struct list_head list;
598 
599 	/* usage count */
600 	atomic_t count;
601 
602 	/* List of struct btrfs_free_clusters for this block group.
603 	 * Today it will only have one thing on it, but that may change
604 	 */
605 	struct list_head cluster_list;
606 
607 	/* For delayed block group creation or deletion of empty block groups */
608 	struct list_head bg_list;
609 
610 	/* For read-only block groups */
611 	struct list_head ro_list;
612 
613 	atomic_t trimming;
614 
615 	/* For dirty block groups */
616 	struct list_head dirty_list;
617 	struct list_head io_list;
618 
619 	struct btrfs_io_ctl io_ctl;
620 
621 	/*
622 	 * Incremented when doing extent allocations and holding a read lock
623 	 * on the space_info's groups_sem semaphore.
624 	 * Decremented when an ordered extent that represents an IO against this
625 	 * block group's range is created (after it's added to its inode's
626 	 * root's list of ordered extents) or immediately after the allocation
627 	 * if it's a metadata extent or fallocate extent (for these cases we
628 	 * don't create ordered extents).
629 	 */
630 	atomic_t reservations;
631 
632 	/*
633 	 * Incremented while holding the spinlock *lock* by a task checking if
634 	 * it can perform a nocow write (incremented if the value for the *ro*
635 	 * field is 0). Decremented by such tasks once they create an ordered
636 	 * extent or before that if some error happens before reaching that step.
637 	 * This is to prevent races between block group relocation and nocow
638 	 * writes through direct IO.
639 	 */
640 	atomic_t nocow_writers;
641 
642 	/* Lock for free space tree operations. */
643 	struct mutex free_space_lock;
644 
645 	/*
646 	 * Does the block group need to be added to the free space tree?
647 	 * Protected by free_space_lock.
648 	 */
649 	int needs_free_space;
650 };
651 
652 /* delayed seq elem */
653 struct seq_list {
654 	struct list_head list;
655 	u64 seq;
656 };
657 
658 #define SEQ_LIST_INIT(name)	{ .list = LIST_HEAD_INIT((name).list), .seq = 0 }
659 
660 enum btrfs_orphan_cleanup_state {
661 	ORPHAN_CLEANUP_STARTED	= 1,
662 	ORPHAN_CLEANUP_DONE	= 2,
663 };
664 
665 /* used by the raid56 code to lock stripes for read/modify/write */
666 struct btrfs_stripe_hash {
667 	struct list_head hash_list;
668 	wait_queue_head_t wait;
669 	spinlock_t lock;
670 };
671 
672 /* used by the raid56 code to lock stripes for read/modify/write */
673 struct btrfs_stripe_hash_table {
674 	struct list_head stripe_cache;
675 	spinlock_t cache_lock;
676 	int cache_size;
677 	struct btrfs_stripe_hash table[];
678 };
679 
680 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
681 
682 void btrfs_init_async_reclaim_work(struct work_struct *work);
683 
684 /* fs_info */
685 struct reloc_control;
686 struct btrfs_device;
687 struct btrfs_fs_devices;
688 struct btrfs_balance_control;
689 struct btrfs_delayed_root;
690 
691 #define BTRFS_FS_BARRIER			1
692 #define BTRFS_FS_CLOSING_START			2
693 #define BTRFS_FS_CLOSING_DONE			3
694 #define BTRFS_FS_LOG_RECOVERING			4
695 #define BTRFS_FS_OPEN				5
696 #define BTRFS_FS_QUOTA_ENABLED			6
697 #define BTRFS_FS_QUOTA_ENABLING			7
698 #define BTRFS_FS_QUOTA_DISABLING		8
699 #define BTRFS_FS_UPDATE_UUID_TREE_GEN		9
700 #define BTRFS_FS_CREATING_FREE_SPACE_TREE	10
701 #define BTRFS_FS_BTREE_ERR			11
702 #define BTRFS_FS_LOG1_ERR			12
703 #define BTRFS_FS_LOG2_ERR			13
704 
705 struct btrfs_fs_info {
706 	u8 fsid[BTRFS_FSID_SIZE];
707 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
708 	unsigned long flags;
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 	struct btrfs_root *quota_root;
716 	struct btrfs_root *uuid_root;
717 	struct btrfs_root *free_space_root;
718 
719 	/* the log root tree is a directory of all the other log roots */
720 	struct btrfs_root *log_root_tree;
721 
722 	spinlock_t fs_roots_radix_lock;
723 	struct radix_tree_root fs_roots_radix;
724 
725 	/* block group cache stuff */
726 	spinlock_t block_group_cache_lock;
727 	u64 first_logical_byte;
728 	struct rb_root block_group_cache_tree;
729 
730 	/* keep track of unallocated space */
731 	spinlock_t free_chunk_lock;
732 	u64 free_chunk_space;
733 
734 	struct extent_io_tree freed_extents[2];
735 	struct extent_io_tree *pinned_extents;
736 
737 	/* logical->physical extent mapping */
738 	struct btrfs_mapping_tree mapping_tree;
739 
740 	/*
741 	 * block reservation for extent, checksum, root tree and
742 	 * delayed dir index item
743 	 */
744 	struct btrfs_block_rsv global_block_rsv;
745 	/* block reservation for delay allocation */
746 	struct btrfs_block_rsv delalloc_block_rsv;
747 	/* block reservation for metadata operations */
748 	struct btrfs_block_rsv trans_block_rsv;
749 	/* block reservation for chunk tree */
750 	struct btrfs_block_rsv chunk_block_rsv;
751 	/* block reservation for delayed operations */
752 	struct btrfs_block_rsv delayed_block_rsv;
753 
754 	struct btrfs_block_rsv empty_block_rsv;
755 
756 	u64 generation;
757 	u64 last_trans_committed;
758 	u64 avg_delayed_ref_runtime;
759 
760 	/*
761 	 * this is updated to the current trans every time a full commit
762 	 * is required instead of the faster short fsync log commits
763 	 */
764 	u64 last_trans_log_full_commit;
765 	unsigned long mount_opt;
766 	/*
767 	 * Track requests for actions that need to be done during transaction
768 	 * commit (like for some mount options).
769 	 */
770 	unsigned long pending_changes;
771 	unsigned long compress_type:4;
772 	int commit_interval;
773 	/*
774 	 * It is a suggestive number, the read side is safe even it gets a
775 	 * wrong number because we will write out the data into a regular
776 	 * extent. The write side(mount/remount) is under ->s_umount lock,
777 	 * so it is also safe.
778 	 */
779 	u64 max_inline;
780 	/*
781 	 * Protected by ->chunk_mutex and sb->s_umount.
782 	 *
783 	 * The reason that we use two lock to protect it is because only
784 	 * remount and mount operations can change it and these two operations
785 	 * are under sb->s_umount, but the read side (chunk allocation) can not
786 	 * acquire sb->s_umount or the deadlock would happen. So we use two
787 	 * locks to protect it. On the write side, we must acquire two locks,
788 	 * and on the read side, we just need acquire one of them.
789 	 */
790 	u64 alloc_start;
791 	struct btrfs_transaction *running_transaction;
792 	wait_queue_head_t transaction_throttle;
793 	wait_queue_head_t transaction_wait;
794 	wait_queue_head_t transaction_blocked_wait;
795 	wait_queue_head_t async_submit_wait;
796 
797 	/*
798 	 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
799 	 * when they are updated.
800 	 *
801 	 * Because we do not clear the flags for ever, so we needn't use
802 	 * the lock on the read side.
803 	 *
804 	 * We also needn't use the lock when we mount the fs, because
805 	 * there is no other task which will update the flag.
806 	 */
807 	spinlock_t super_lock;
808 	struct btrfs_super_block *super_copy;
809 	struct btrfs_super_block *super_for_commit;
810 	struct super_block *sb;
811 	struct inode *btree_inode;
812 	struct backing_dev_info bdi;
813 	struct mutex tree_log_mutex;
814 	struct mutex transaction_kthread_mutex;
815 	struct mutex cleaner_mutex;
816 	struct mutex chunk_mutex;
817 	struct mutex volume_mutex;
818 
819 	/*
820 	 * this is taken to make sure we don't set block groups ro after
821 	 * the free space cache has been allocated on them
822 	 */
823 	struct mutex ro_block_group_mutex;
824 
825 	/* this is used during read/modify/write to make sure
826 	 * no two ios are trying to mod the same stripe at the same
827 	 * time
828 	 */
829 	struct btrfs_stripe_hash_table *stripe_hash_table;
830 
831 	/*
832 	 * this protects the ordered operations list only while we are
833 	 * processing all of the entries on it.  This way we make
834 	 * sure the commit code doesn't find the list temporarily empty
835 	 * because another function happens to be doing non-waiting preflush
836 	 * before jumping into the main commit.
837 	 */
838 	struct mutex ordered_operations_mutex;
839 
840 	struct rw_semaphore commit_root_sem;
841 
842 	struct rw_semaphore cleanup_work_sem;
843 
844 	struct rw_semaphore subvol_sem;
845 	struct srcu_struct subvol_srcu;
846 
847 	spinlock_t trans_lock;
848 	/*
849 	 * the reloc mutex goes with the trans lock, it is taken
850 	 * during commit to protect us from the relocation code
851 	 */
852 	struct mutex reloc_mutex;
853 
854 	struct list_head trans_list;
855 	struct list_head dead_roots;
856 	struct list_head caching_block_groups;
857 
858 	spinlock_t delayed_iput_lock;
859 	struct list_head delayed_iputs;
860 	struct mutex cleaner_delayed_iput_mutex;
861 
862 	/* this protects tree_mod_seq_list */
863 	spinlock_t tree_mod_seq_lock;
864 	atomic64_t tree_mod_seq;
865 	struct list_head tree_mod_seq_list;
866 
867 	/* this protects tree_mod_log */
868 	rwlock_t tree_mod_log_lock;
869 	struct rb_root tree_mod_log;
870 
871 	atomic_t nr_async_submits;
872 	atomic_t async_submit_draining;
873 	atomic_t nr_async_bios;
874 	atomic_t async_delalloc_pages;
875 	atomic_t open_ioctl_trans;
876 
877 	/*
878 	 * this is used to protect the following list -- ordered_roots.
879 	 */
880 	spinlock_t ordered_root_lock;
881 
882 	/*
883 	 * all fs/file tree roots in which there are data=ordered extents
884 	 * pending writeback are added into this list.
885 	 *
886 	 * these can span multiple transactions and basically include
887 	 * every dirty data page that isn't from nodatacow
888 	 */
889 	struct list_head ordered_roots;
890 
891 	struct mutex delalloc_root_mutex;
892 	spinlock_t delalloc_root_lock;
893 	/* all fs/file tree roots that have delalloc inodes. */
894 	struct list_head delalloc_roots;
895 
896 	/*
897 	 * there is a pool of worker threads for checksumming during writes
898 	 * and a pool for checksumming after reads.  This is because readers
899 	 * can run with FS locks held, and the writers may be waiting for
900 	 * those locks.  We don't want ordering in the pending list to cause
901 	 * deadlocks, and so the two are serviced separately.
902 	 *
903 	 * A third pool does submit_bio to avoid deadlocking with the other
904 	 * two
905 	 */
906 	struct btrfs_workqueue *workers;
907 	struct btrfs_workqueue *delalloc_workers;
908 	struct btrfs_workqueue *flush_workers;
909 	struct btrfs_workqueue *endio_workers;
910 	struct btrfs_workqueue *endio_meta_workers;
911 	struct btrfs_workqueue *endio_raid56_workers;
912 	struct btrfs_workqueue *endio_repair_workers;
913 	struct btrfs_workqueue *rmw_workers;
914 	struct btrfs_workqueue *endio_meta_write_workers;
915 	struct btrfs_workqueue *endio_write_workers;
916 	struct btrfs_workqueue *endio_freespace_worker;
917 	struct btrfs_workqueue *submit_workers;
918 	struct btrfs_workqueue *caching_workers;
919 	struct btrfs_workqueue *readahead_workers;
920 
921 	/*
922 	 * fixup workers take dirty pages that didn't properly go through
923 	 * the cow mechanism and make them safe to write.  It happens
924 	 * for the sys_munmap function call path
925 	 */
926 	struct btrfs_workqueue *fixup_workers;
927 	struct btrfs_workqueue *delayed_workers;
928 
929 	/* the extent workers do delayed refs on the extent allocation tree */
930 	struct btrfs_workqueue *extent_workers;
931 	struct task_struct *transaction_kthread;
932 	struct task_struct *cleaner_kthread;
933 	int thread_pool_size;
934 
935 	struct kobject *space_info_kobj;
936 
937 	u64 total_pinned;
938 
939 	/* used to keep from writing metadata until there is a nice batch */
940 	struct percpu_counter dirty_metadata_bytes;
941 	struct percpu_counter delalloc_bytes;
942 	s32 dirty_metadata_batch;
943 	s32 delalloc_batch;
944 
945 	struct list_head dirty_cowonly_roots;
946 
947 	struct btrfs_fs_devices *fs_devices;
948 
949 	/*
950 	 * the space_info list is almost entirely read only.  It only changes
951 	 * when we add a new raid type to the FS, and that happens
952 	 * very rarely.  RCU is used to protect it.
953 	 */
954 	struct list_head space_info;
955 
956 	struct btrfs_space_info *data_sinfo;
957 
958 	struct reloc_control *reloc_ctl;
959 
960 	/* data_alloc_cluster is only used in ssd mode */
961 	struct btrfs_free_cluster data_alloc_cluster;
962 
963 	/* all metadata allocations go through this cluster */
964 	struct btrfs_free_cluster meta_alloc_cluster;
965 
966 	/* auto defrag inodes go here */
967 	spinlock_t defrag_inodes_lock;
968 	struct rb_root defrag_inodes;
969 	atomic_t defrag_running;
970 
971 	/* Used to protect avail_{data, metadata, system}_alloc_bits */
972 	seqlock_t profiles_lock;
973 	/*
974 	 * these three are in extended format (availability of single
975 	 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
976 	 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
977 	 */
978 	u64 avail_data_alloc_bits;
979 	u64 avail_metadata_alloc_bits;
980 	u64 avail_system_alloc_bits;
981 
982 	/* restriper state */
983 	spinlock_t balance_lock;
984 	struct mutex balance_mutex;
985 	atomic_t balance_running;
986 	atomic_t balance_pause_req;
987 	atomic_t balance_cancel_req;
988 	struct btrfs_balance_control *balance_ctl;
989 	wait_queue_head_t balance_wait_q;
990 
991 	unsigned data_chunk_allocations;
992 	unsigned metadata_ratio;
993 
994 	void *bdev_holder;
995 
996 	/* private scrub information */
997 	struct mutex scrub_lock;
998 	atomic_t scrubs_running;
999 	atomic_t scrub_pause_req;
1000 	atomic_t scrubs_paused;
1001 	atomic_t scrub_cancel_req;
1002 	wait_queue_head_t scrub_pause_wait;
1003 	int scrub_workers_refcnt;
1004 	struct btrfs_workqueue *scrub_workers;
1005 	struct btrfs_workqueue *scrub_wr_completion_workers;
1006 	struct btrfs_workqueue *scrub_nocow_workers;
1007 	struct btrfs_workqueue *scrub_parity_workers;
1008 
1009 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1010 	u32 check_integrity_print_mask;
1011 #endif
1012 	/* is qgroup tracking in a consistent state? */
1013 	u64 qgroup_flags;
1014 
1015 	/* holds configuration and tracking. Protected by qgroup_lock */
1016 	struct rb_root qgroup_tree;
1017 	struct rb_root qgroup_op_tree;
1018 	spinlock_t qgroup_lock;
1019 	spinlock_t qgroup_op_lock;
1020 	atomic_t qgroup_op_seq;
1021 
1022 	/*
1023 	 * used to avoid frequently calling ulist_alloc()/ulist_free()
1024 	 * when doing qgroup accounting, it must be protected by qgroup_lock.
1025 	 */
1026 	struct ulist *qgroup_ulist;
1027 
1028 	/* protect user change for quota operations */
1029 	struct mutex qgroup_ioctl_lock;
1030 
1031 	/* list of dirty qgroups to be written at next commit */
1032 	struct list_head dirty_qgroups;
1033 
1034 	/* used by qgroup for an efficient tree traversal */
1035 	u64 qgroup_seq;
1036 
1037 	/* qgroup rescan items */
1038 	struct mutex qgroup_rescan_lock; /* protects the progress item */
1039 	struct btrfs_key qgroup_rescan_progress;
1040 	struct btrfs_workqueue *qgroup_rescan_workers;
1041 	struct completion qgroup_rescan_completion;
1042 	struct btrfs_work qgroup_rescan_work;
1043 	bool qgroup_rescan_running;	/* protected by qgroup_rescan_lock */
1044 
1045 	/* filesystem state */
1046 	unsigned long fs_state;
1047 
1048 	struct btrfs_delayed_root *delayed_root;
1049 
1050 	/* readahead tree */
1051 	spinlock_t reada_lock;
1052 	struct radix_tree_root reada_tree;
1053 
1054 	/* readahead works cnt */
1055 	atomic_t reada_works_cnt;
1056 
1057 	/* Extent buffer radix tree */
1058 	spinlock_t buffer_lock;
1059 	struct radix_tree_root buffer_radix;
1060 
1061 	/* next backup root to be overwritten */
1062 	int backup_root_index;
1063 
1064 	int num_tolerated_disk_barrier_failures;
1065 
1066 	/* device replace state */
1067 	struct btrfs_dev_replace dev_replace;
1068 
1069 	atomic_t mutually_exclusive_operation_running;
1070 
1071 	struct percpu_counter bio_counter;
1072 	wait_queue_head_t replace_wait;
1073 
1074 	struct semaphore uuid_tree_rescan_sem;
1075 
1076 	/* Used to reclaim the metadata space in the background. */
1077 	struct work_struct async_reclaim_work;
1078 
1079 	spinlock_t unused_bgs_lock;
1080 	struct list_head unused_bgs;
1081 	struct mutex unused_bg_unpin_mutex;
1082 	struct mutex delete_unused_bgs_mutex;
1083 
1084 	/* For btrfs to record security options */
1085 	struct security_mnt_opts security_opts;
1086 
1087 	/*
1088 	 * Chunks that can't be freed yet (under a trim/discard operation)
1089 	 * and will be latter freed. Protected by fs_info->chunk_mutex.
1090 	 */
1091 	struct list_head pinned_chunks;
1092 
1093 	/* Used to record internally whether fs has been frozen */
1094 	int fs_frozen;
1095 
1096 	/* Cached block sizes */
1097 	u32 nodesize;
1098 	u32 sectorsize;
1099 	u32 stripesize;
1100 };
1101 
1102 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1103 {
1104 	return sb->s_fs_info;
1105 }
1106 
1107 struct btrfs_subvolume_writers {
1108 	struct percpu_counter	counter;
1109 	wait_queue_head_t	wait;
1110 };
1111 
1112 /*
1113  * The state of btrfs root
1114  */
1115 /*
1116  * btrfs_record_root_in_trans is a multi-step process,
1117  * and it can race with the balancing code.   But the
1118  * race is very small, and only the first time the root
1119  * is added to each transaction.  So IN_TRANS_SETUP
1120  * is used to tell us when more checks are required
1121  */
1122 #define BTRFS_ROOT_IN_TRANS_SETUP	0
1123 #define BTRFS_ROOT_REF_COWS		1
1124 #define BTRFS_ROOT_TRACK_DIRTY		2
1125 #define BTRFS_ROOT_IN_RADIX		3
1126 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED	4
1127 #define BTRFS_ROOT_DEFRAG_RUNNING	5
1128 #define BTRFS_ROOT_FORCE_COW		6
1129 #define BTRFS_ROOT_MULTI_LOG_TASKS	7
1130 #define BTRFS_ROOT_DIRTY		8
1131 
1132 /*
1133  * in ram representation of the tree.  extent_root is used for all allocations
1134  * and for the extent tree extent_root root.
1135  */
1136 struct btrfs_root {
1137 	struct extent_buffer *node;
1138 
1139 	struct extent_buffer *commit_root;
1140 	struct btrfs_root *log_root;
1141 	struct btrfs_root *reloc_root;
1142 
1143 	unsigned long state;
1144 	struct btrfs_root_item root_item;
1145 	struct btrfs_key root_key;
1146 	struct btrfs_fs_info *fs_info;
1147 	struct extent_io_tree dirty_log_pages;
1148 
1149 	struct mutex objectid_mutex;
1150 
1151 	spinlock_t accounting_lock;
1152 	struct btrfs_block_rsv *block_rsv;
1153 
1154 	/* free ino cache stuff */
1155 	struct btrfs_free_space_ctl *free_ino_ctl;
1156 	enum btrfs_caching_type ino_cache_state;
1157 	spinlock_t ino_cache_lock;
1158 	wait_queue_head_t ino_cache_wait;
1159 	struct btrfs_free_space_ctl *free_ino_pinned;
1160 	u64 ino_cache_progress;
1161 	struct inode *ino_cache_inode;
1162 
1163 	struct mutex log_mutex;
1164 	wait_queue_head_t log_writer_wait;
1165 	wait_queue_head_t log_commit_wait[2];
1166 	struct list_head log_ctxs[2];
1167 	atomic_t log_writers;
1168 	atomic_t log_commit[2];
1169 	atomic_t log_batch;
1170 	int log_transid;
1171 	/* No matter the commit succeeds or not*/
1172 	int log_transid_committed;
1173 	/* Just be updated when the commit succeeds. */
1174 	int last_log_commit;
1175 	pid_t log_start_pid;
1176 
1177 	u64 objectid;
1178 	u64 last_trans;
1179 
1180 	u32 type;
1181 
1182 	u64 highest_objectid;
1183 
1184 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1185 	/* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1186 	u64 alloc_bytenr;
1187 #endif
1188 
1189 	u64 defrag_trans_start;
1190 	struct btrfs_key defrag_progress;
1191 	struct btrfs_key defrag_max;
1192 	char *name;
1193 
1194 	/* the dirty list is only used by non-reference counted roots */
1195 	struct list_head dirty_list;
1196 
1197 	struct list_head root_list;
1198 
1199 	spinlock_t log_extents_lock[2];
1200 	struct list_head logged_list[2];
1201 
1202 	spinlock_t orphan_lock;
1203 	atomic_t orphan_inodes;
1204 	struct btrfs_block_rsv *orphan_block_rsv;
1205 	int orphan_cleanup_state;
1206 
1207 	spinlock_t inode_lock;
1208 	/* red-black tree that keeps track of in-memory inodes */
1209 	struct rb_root inode_tree;
1210 
1211 	/*
1212 	 * radix tree that keeps track of delayed nodes of every inode,
1213 	 * protected by inode_lock
1214 	 */
1215 	struct radix_tree_root delayed_nodes_tree;
1216 	/*
1217 	 * right now this just gets used so that a root has its own devid
1218 	 * for stat.  It may be used for more later
1219 	 */
1220 	dev_t anon_dev;
1221 
1222 	spinlock_t root_item_lock;
1223 	atomic_t refs;
1224 
1225 	struct mutex delalloc_mutex;
1226 	spinlock_t delalloc_lock;
1227 	/*
1228 	 * all of the inodes that have delalloc bytes.  It is possible for
1229 	 * this list to be empty even when there is still dirty data=ordered
1230 	 * extents waiting to finish IO.
1231 	 */
1232 	struct list_head delalloc_inodes;
1233 	struct list_head delalloc_root;
1234 	u64 nr_delalloc_inodes;
1235 
1236 	struct mutex ordered_extent_mutex;
1237 	/*
1238 	 * this is used by the balancing code to wait for all the pending
1239 	 * ordered extents
1240 	 */
1241 	spinlock_t ordered_extent_lock;
1242 
1243 	/*
1244 	 * all of the data=ordered extents pending writeback
1245 	 * these can span multiple transactions and basically include
1246 	 * every dirty data page that isn't from nodatacow
1247 	 */
1248 	struct list_head ordered_extents;
1249 	struct list_head ordered_root;
1250 	u64 nr_ordered_extents;
1251 
1252 	/*
1253 	 * Number of currently running SEND ioctls to prevent
1254 	 * manipulation with the read-only status via SUBVOL_SETFLAGS
1255 	 */
1256 	int send_in_progress;
1257 	struct btrfs_subvolume_writers *subv_writers;
1258 	atomic_t will_be_snapshoted;
1259 
1260 	/* For qgroup metadata space reserve */
1261 	atomic_t qgroup_meta_rsv;
1262 };
1263 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1264 {
1265 	return btrfs_sb(inode->i_sb)->sectorsize;
1266 }
1267 
1268 static inline u32 __BTRFS_LEAF_DATA_SIZE(u32 blocksize)
1269 {
1270 	return blocksize - sizeof(struct btrfs_header);
1271 }
1272 
1273 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1274 {
1275 	return __BTRFS_LEAF_DATA_SIZE(info->nodesize);
1276 }
1277 
1278 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1279 {
1280 	return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1281 }
1282 
1283 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1284 {
1285 	return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1286 }
1287 
1288 #define BTRFS_FILE_EXTENT_INLINE_DATA_START		\
1289 		(offsetof(struct btrfs_file_extent_item, disk_bytenr))
1290 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1291 {
1292 	return BTRFS_MAX_ITEM_SIZE(info) -
1293 	       BTRFS_FILE_EXTENT_INLINE_DATA_START;
1294 }
1295 
1296 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1297 {
1298 	return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1299 }
1300 
1301 /*
1302  * Flags for mount options.
1303  *
1304  * Note: don't forget to add new options to btrfs_show_options()
1305  */
1306 #define BTRFS_MOUNT_NODATASUM		(1 << 0)
1307 #define BTRFS_MOUNT_NODATACOW		(1 << 1)
1308 #define BTRFS_MOUNT_NOBARRIER		(1 << 2)
1309 #define BTRFS_MOUNT_SSD			(1 << 3)
1310 #define BTRFS_MOUNT_DEGRADED		(1 << 4)
1311 #define BTRFS_MOUNT_COMPRESS		(1 << 5)
1312 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1313 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1314 #define BTRFS_MOUNT_SSD_SPREAD		(1 << 8)
1315 #define BTRFS_MOUNT_NOSSD		(1 << 9)
1316 #define BTRFS_MOUNT_DISCARD		(1 << 10)
1317 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1318 #define BTRFS_MOUNT_SPACE_CACHE		(1 << 12)
1319 #define BTRFS_MOUNT_CLEAR_CACHE		(1 << 13)
1320 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1321 #define BTRFS_MOUNT_ENOSPC_DEBUG	 (1 << 15)
1322 #define BTRFS_MOUNT_AUTO_DEFRAG		(1 << 16)
1323 #define BTRFS_MOUNT_INODE_MAP_CACHE	(1 << 17)
1324 #define BTRFS_MOUNT_USEBACKUPROOT	(1 << 18)
1325 #define BTRFS_MOUNT_SKIP_BALANCE	(1 << 19)
1326 #define BTRFS_MOUNT_CHECK_INTEGRITY	(1 << 20)
1327 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1328 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	(1 << 22)
1329 #define BTRFS_MOUNT_RESCAN_UUID_TREE	(1 << 23)
1330 #define BTRFS_MOUNT_FRAGMENT_DATA	(1 << 24)
1331 #define BTRFS_MOUNT_FRAGMENT_METADATA	(1 << 25)
1332 #define BTRFS_MOUNT_FREE_SPACE_TREE	(1 << 26)
1333 #define BTRFS_MOUNT_NOLOGREPLAY		(1 << 27)
1334 
1335 #define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)
1336 #define BTRFS_DEFAULT_MAX_INLINE	(2048)
1337 
1338 #define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
1339 #define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
1340 #define btrfs_raw_test_opt(o, opt)	((o) & BTRFS_MOUNT_##opt)
1341 #define btrfs_test_opt(fs_info, opt)	((fs_info)->mount_opt & \
1342 					 BTRFS_MOUNT_##opt)
1343 
1344 #define btrfs_set_and_info(fs_info, opt, fmt, args...)			\
1345 {									\
1346 	if (!btrfs_test_opt(fs_info, opt))				\
1347 		btrfs_info(fs_info, fmt, ##args);			\
1348 	btrfs_set_opt(fs_info->mount_opt, opt);				\
1349 }
1350 
1351 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)		\
1352 {									\
1353 	if (btrfs_test_opt(fs_info, opt))				\
1354 		btrfs_info(fs_info, fmt, ##args);			\
1355 	btrfs_clear_opt(fs_info->mount_opt, opt);			\
1356 }
1357 
1358 #ifdef CONFIG_BTRFS_DEBUG
1359 static inline int
1360 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1361 {
1362 	struct btrfs_fs_info *fs_info = block_group->fs_info;
1363 
1364 	return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1365 		block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1366 	       (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1367 		block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1368 }
1369 #endif
1370 
1371 /*
1372  * Requests for changes that need to be done during transaction commit.
1373  *
1374  * Internal mount options that are used for special handling of the real
1375  * mount options (eg. cannot be set during remount and have to be set during
1376  * transaction commit)
1377  */
1378 
1379 #define BTRFS_PENDING_SET_INODE_MAP_CACHE	(0)
1380 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE	(1)
1381 #define BTRFS_PENDING_COMMIT			(2)
1382 
1383 #define btrfs_test_pending(info, opt)	\
1384 	test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1385 #define btrfs_set_pending(info, opt)	\
1386 	set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1387 #define btrfs_clear_pending(info, opt)	\
1388 	clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1389 
1390 /*
1391  * Helpers for setting pending mount option changes.
1392  *
1393  * Expects corresponding macros
1394  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1395  */
1396 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1397 do {                                                                   \
1398        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1399                btrfs_info((info), fmt, ##args);                        \
1400                btrfs_set_pending((info), SET_##opt);                   \
1401                btrfs_clear_pending((info), CLEAR_##opt);               \
1402        }                                                               \
1403 } while(0)
1404 
1405 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1406 do {                                                                   \
1407        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1408                btrfs_info((info), fmt, ##args);                        \
1409                btrfs_set_pending((info), CLEAR_##opt);                 \
1410                btrfs_clear_pending((info), SET_##opt);                 \
1411        }                                                               \
1412 } while(0)
1413 
1414 /*
1415  * Inode flags
1416  */
1417 #define BTRFS_INODE_NODATASUM		(1 << 0)
1418 #define BTRFS_INODE_NODATACOW		(1 << 1)
1419 #define BTRFS_INODE_READONLY		(1 << 2)
1420 #define BTRFS_INODE_NOCOMPRESS		(1 << 3)
1421 #define BTRFS_INODE_PREALLOC		(1 << 4)
1422 #define BTRFS_INODE_SYNC		(1 << 5)
1423 #define BTRFS_INODE_IMMUTABLE		(1 << 6)
1424 #define BTRFS_INODE_APPEND		(1 << 7)
1425 #define BTRFS_INODE_NODUMP		(1 << 8)
1426 #define BTRFS_INODE_NOATIME		(1 << 9)
1427 #define BTRFS_INODE_DIRSYNC		(1 << 10)
1428 #define BTRFS_INODE_COMPRESS		(1 << 11)
1429 
1430 #define BTRFS_INODE_ROOT_ITEM_INIT	(1 << 31)
1431 
1432 struct btrfs_map_token {
1433 	struct extent_buffer *eb;
1434 	char *kaddr;
1435 	unsigned long offset;
1436 };
1437 
1438 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1439 				((bytes) >> (fs_info)->sb->s_blocksize_bits)
1440 
1441 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1442 {
1443 	token->kaddr = NULL;
1444 }
1445 
1446 /* some macros to generate set/get functions for the struct fields.  This
1447  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1448  * one for u8:
1449  */
1450 #define le8_to_cpu(v) (v)
1451 #define cpu_to_le8(v) (v)
1452 #define __le8 u8
1453 
1454 #define read_eb_member(eb, ptr, type, member, result) (\
1455 	read_extent_buffer(eb, (char *)(result),			\
1456 			   ((unsigned long)(ptr)) +			\
1457 			    offsetof(type, member),			\
1458 			   sizeof(((type *)0)->member)))
1459 
1460 #define write_eb_member(eb, ptr, type, member, result) (\
1461 	write_extent_buffer(eb, (char *)(result),			\
1462 			   ((unsigned long)(ptr)) +			\
1463 			    offsetof(type, member),			\
1464 			   sizeof(((type *)0)->member)))
1465 
1466 #define DECLARE_BTRFS_SETGET_BITS(bits)					\
1467 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,	\
1468 			       unsigned long off,			\
1469                               struct btrfs_map_token *token);		\
1470 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr,	\
1471 			    unsigned long off, u##bits val,		\
1472 			    struct btrfs_map_token *token);		\
1473 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
1474 				       unsigned long off)		\
1475 {									\
1476 	return btrfs_get_token_##bits(eb, ptr, off, NULL);		\
1477 }									\
1478 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
1479 				    unsigned long off, u##bits val)	\
1480 {									\
1481        btrfs_set_token_##bits(eb, ptr, off, val, NULL);			\
1482 }
1483 
1484 DECLARE_BTRFS_SETGET_BITS(8)
1485 DECLARE_BTRFS_SETGET_BITS(16)
1486 DECLARE_BTRFS_SETGET_BITS(32)
1487 DECLARE_BTRFS_SETGET_BITS(64)
1488 
1489 #define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
1490 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s)	\
1491 {									\
1492 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1493 	return btrfs_get_##bits(eb, s, offsetof(type, member));		\
1494 }									\
1495 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,	\
1496 				    u##bits val)			\
1497 {									\
1498 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1499 	btrfs_set_##bits(eb, s, offsetof(type, member), val);		\
1500 }									\
1501 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
1502 					 struct btrfs_map_token *token)	\
1503 {									\
1504 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1505 	return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1506 }									\
1507 static inline void btrfs_set_token_##name(struct extent_buffer *eb,	\
1508 					  type *s, u##bits val,		\
1509                                          struct btrfs_map_token *token)	\
1510 {									\
1511 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1512 	btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1513 }
1514 
1515 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
1516 static inline u##bits btrfs_##name(struct extent_buffer *eb)		\
1517 {									\
1518 	type *p = page_address(eb->pages[0]);				\
1519 	u##bits res = le##bits##_to_cpu(p->member);			\
1520 	return res;							\
1521 }									\
1522 static inline void btrfs_set_##name(struct extent_buffer *eb,		\
1523 				    u##bits val)			\
1524 {									\
1525 	type *p = page_address(eb->pages[0]);				\
1526 	p->member = cpu_to_le##bits(val);				\
1527 }
1528 
1529 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
1530 static inline u##bits btrfs_##name(type *s)				\
1531 {									\
1532 	return le##bits##_to_cpu(s->member);				\
1533 }									\
1534 static inline void btrfs_set_##name(type *s, u##bits val)		\
1535 {									\
1536 	s->member = cpu_to_le##bits(val);				\
1537 }
1538 
1539 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1540 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1541 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1542 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1543 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1544 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1545 		   start_offset, 64);
1546 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1547 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1548 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1549 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1550 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1551 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1552 
1553 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1554 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1555 			 total_bytes, 64);
1556 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1557 			 bytes_used, 64);
1558 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1559 			 io_align, 32);
1560 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1561 			 io_width, 32);
1562 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1563 			 sector_size, 32);
1564 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1565 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1566 			 dev_group, 32);
1567 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1568 			 seek_speed, 8);
1569 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1570 			 bandwidth, 8);
1571 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1572 			 generation, 64);
1573 
1574 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1575 {
1576 	return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1577 }
1578 
1579 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1580 {
1581 	return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1582 }
1583 
1584 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1585 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1586 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1587 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1588 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1589 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1590 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1591 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1592 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1593 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1594 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1595 
1596 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1597 {
1598 	return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1599 }
1600 
1601 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1602 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1603 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1604 			 stripe_len, 64);
1605 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1606 			 io_align, 32);
1607 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1608 			 io_width, 32);
1609 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1610 			 sector_size, 32);
1611 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1612 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1613 			 num_stripes, 16);
1614 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1615 			 sub_stripes, 16);
1616 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1617 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1618 
1619 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1620 						   int nr)
1621 {
1622 	unsigned long offset = (unsigned long)c;
1623 	offset += offsetof(struct btrfs_chunk, stripe);
1624 	offset += nr * sizeof(struct btrfs_stripe);
1625 	return (struct btrfs_stripe *)offset;
1626 }
1627 
1628 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1629 {
1630 	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1631 }
1632 
1633 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1634 					 struct btrfs_chunk *c, int nr)
1635 {
1636 	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1637 }
1638 
1639 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1640 					 struct btrfs_chunk *c, int nr)
1641 {
1642 	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1643 }
1644 
1645 /* struct btrfs_block_group_item */
1646 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1647 			 used, 64);
1648 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1649 			 used, 64);
1650 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1651 			struct btrfs_block_group_item, chunk_objectid, 64);
1652 
1653 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1654 		   struct btrfs_block_group_item, chunk_objectid, 64);
1655 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1656 		   struct btrfs_block_group_item, flags, 64);
1657 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1658 			struct btrfs_block_group_item, flags, 64);
1659 
1660 /* struct btrfs_free_space_info */
1661 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1662 		   extent_count, 32);
1663 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1664 
1665 /* struct btrfs_inode_ref */
1666 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1667 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1668 
1669 /* struct btrfs_inode_extref */
1670 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1671 		   parent_objectid, 64);
1672 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1673 		   name_len, 16);
1674 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1675 
1676 /* struct btrfs_inode_item */
1677 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1678 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1679 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1680 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1681 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1682 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1683 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1684 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1685 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1686 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1687 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1688 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1689 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1690 			 generation, 64);
1691 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1692 			 sequence, 64);
1693 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1694 			 transid, 64);
1695 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1696 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1697 			 nbytes, 64);
1698 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1699 			 block_group, 64);
1700 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1701 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1702 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1703 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1704 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1705 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1706 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1707 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1708 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1709 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1710 
1711 /* struct btrfs_dev_extent */
1712 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1713 		   chunk_tree, 64);
1714 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1715 		   chunk_objectid, 64);
1716 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1717 		   chunk_offset, 64);
1718 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1719 
1720 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1721 {
1722 	unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1723 	return (unsigned long)dev + ptr;
1724 }
1725 
1726 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1727 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1728 		   generation, 64);
1729 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1730 
1731 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1732 
1733 
1734 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1735 
1736 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1737 					struct btrfs_tree_block_info *item,
1738 					struct btrfs_disk_key *key)
1739 {
1740 	read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1741 }
1742 
1743 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1744 					    struct btrfs_tree_block_info *item,
1745 					    struct btrfs_disk_key *key)
1746 {
1747 	write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1748 }
1749 
1750 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1751 		   root, 64);
1752 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1753 		   objectid, 64);
1754 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1755 		   offset, 64);
1756 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1757 		   count, 32);
1758 
1759 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1760 		   count, 32);
1761 
1762 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1763 		   type, 8);
1764 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1765 		   offset, 64);
1766 
1767 static inline u32 btrfs_extent_inline_ref_size(int type)
1768 {
1769 	if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1770 	    type == BTRFS_SHARED_BLOCK_REF_KEY)
1771 		return sizeof(struct btrfs_extent_inline_ref);
1772 	if (type == BTRFS_SHARED_DATA_REF_KEY)
1773 		return sizeof(struct btrfs_shared_data_ref) +
1774 		       sizeof(struct btrfs_extent_inline_ref);
1775 	if (type == BTRFS_EXTENT_DATA_REF_KEY)
1776 		return sizeof(struct btrfs_extent_data_ref) +
1777 		       offsetof(struct btrfs_extent_inline_ref, offset);
1778 	BUG();
1779 	return 0;
1780 }
1781 
1782 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1783 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1784 		   generation, 64);
1785 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1786 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1787 
1788 /* struct btrfs_node */
1789 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1790 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1791 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1792 			 blockptr, 64);
1793 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1794 			 generation, 64);
1795 
1796 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1797 {
1798 	unsigned long ptr;
1799 	ptr = offsetof(struct btrfs_node, ptrs) +
1800 		sizeof(struct btrfs_key_ptr) * nr;
1801 	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1802 }
1803 
1804 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1805 					   int nr, u64 val)
1806 {
1807 	unsigned long ptr;
1808 	ptr = offsetof(struct btrfs_node, ptrs) +
1809 		sizeof(struct btrfs_key_ptr) * nr;
1810 	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1811 }
1812 
1813 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1814 {
1815 	unsigned long ptr;
1816 	ptr = offsetof(struct btrfs_node, ptrs) +
1817 		sizeof(struct btrfs_key_ptr) * nr;
1818 	return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1819 }
1820 
1821 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1822 						 int nr, u64 val)
1823 {
1824 	unsigned long ptr;
1825 	ptr = offsetof(struct btrfs_node, ptrs) +
1826 		sizeof(struct btrfs_key_ptr) * nr;
1827 	btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1828 }
1829 
1830 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1831 {
1832 	return offsetof(struct btrfs_node, ptrs) +
1833 		sizeof(struct btrfs_key_ptr) * nr;
1834 }
1835 
1836 void btrfs_node_key(struct extent_buffer *eb,
1837 		    struct btrfs_disk_key *disk_key, int nr);
1838 
1839 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1840 				      struct btrfs_disk_key *disk_key, int nr)
1841 {
1842 	unsigned long ptr;
1843 	ptr = btrfs_node_key_ptr_offset(nr);
1844 	write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1845 		       struct btrfs_key_ptr, key, disk_key);
1846 }
1847 
1848 /* struct btrfs_item */
1849 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1850 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1851 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1852 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1853 
1854 static inline unsigned long btrfs_item_nr_offset(int nr)
1855 {
1856 	return offsetof(struct btrfs_leaf, items) +
1857 		sizeof(struct btrfs_item) * nr;
1858 }
1859 
1860 static inline struct btrfs_item *btrfs_item_nr(int nr)
1861 {
1862 	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1863 }
1864 
1865 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1866 				 struct btrfs_item *item)
1867 {
1868 	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1869 }
1870 
1871 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1872 {
1873 	return btrfs_item_end(eb, btrfs_item_nr(nr));
1874 }
1875 
1876 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1877 {
1878 	return btrfs_item_offset(eb, btrfs_item_nr(nr));
1879 }
1880 
1881 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1882 {
1883 	return btrfs_item_size(eb, btrfs_item_nr(nr));
1884 }
1885 
1886 static inline void btrfs_item_key(struct extent_buffer *eb,
1887 			   struct btrfs_disk_key *disk_key, int nr)
1888 {
1889 	struct btrfs_item *item = btrfs_item_nr(nr);
1890 	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1891 }
1892 
1893 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1894 			       struct btrfs_disk_key *disk_key, int nr)
1895 {
1896 	struct btrfs_item *item = btrfs_item_nr(nr);
1897 	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1898 }
1899 
1900 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1901 
1902 /*
1903  * struct btrfs_root_ref
1904  */
1905 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1906 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1907 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1908 
1909 /* struct btrfs_dir_item */
1910 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1911 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1912 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1913 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1914 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1915 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1916 			 data_len, 16);
1917 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1918 			 name_len, 16);
1919 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1920 			 transid, 64);
1921 
1922 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1923 				      struct btrfs_dir_item *item,
1924 				      struct btrfs_disk_key *key)
1925 {
1926 	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1927 }
1928 
1929 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1930 					  struct btrfs_dir_item *item,
1931 					  struct btrfs_disk_key *key)
1932 {
1933 	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1934 }
1935 
1936 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1937 		   num_entries, 64);
1938 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1939 		   num_bitmaps, 64);
1940 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1941 		   generation, 64);
1942 
1943 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1944 					struct btrfs_free_space_header *h,
1945 					struct btrfs_disk_key *key)
1946 {
1947 	read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1948 }
1949 
1950 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1951 					    struct btrfs_free_space_header *h,
1952 					    struct btrfs_disk_key *key)
1953 {
1954 	write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1955 }
1956 
1957 /* struct btrfs_disk_key */
1958 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1959 			 objectid, 64);
1960 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1961 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1962 
1963 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1964 					 const struct btrfs_disk_key *disk)
1965 {
1966 	cpu->offset = le64_to_cpu(disk->offset);
1967 	cpu->type = disk->type;
1968 	cpu->objectid = le64_to_cpu(disk->objectid);
1969 }
1970 
1971 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1972 					 const struct btrfs_key *cpu)
1973 {
1974 	disk->offset = cpu_to_le64(cpu->offset);
1975 	disk->type = cpu->type;
1976 	disk->objectid = cpu_to_le64(cpu->objectid);
1977 }
1978 
1979 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1980 				  struct btrfs_key *key, int nr)
1981 {
1982 	struct btrfs_disk_key disk_key;
1983 	btrfs_node_key(eb, &disk_key, nr);
1984 	btrfs_disk_key_to_cpu(key, &disk_key);
1985 }
1986 
1987 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1988 				  struct btrfs_key *key, int nr)
1989 {
1990 	struct btrfs_disk_key disk_key;
1991 	btrfs_item_key(eb, &disk_key, nr);
1992 	btrfs_disk_key_to_cpu(key, &disk_key);
1993 }
1994 
1995 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1996 				      struct btrfs_dir_item *item,
1997 				      struct btrfs_key *key)
1998 {
1999 	struct btrfs_disk_key disk_key;
2000 	btrfs_dir_item_key(eb, item, &disk_key);
2001 	btrfs_disk_key_to_cpu(key, &disk_key);
2002 }
2003 
2004 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2005 {
2006 	return key->type;
2007 }
2008 
2009 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2010 {
2011 	key->type = val;
2012 }
2013 
2014 /* struct btrfs_header */
2015 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2016 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2017 			  generation, 64);
2018 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2019 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2020 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2021 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2022 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2023 			 generation, 64);
2024 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2025 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2026 			 nritems, 32);
2027 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2028 
2029 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2030 {
2031 	return (btrfs_header_flags(eb) & flag) == flag;
2032 }
2033 
2034 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2035 {
2036 	u64 flags = btrfs_header_flags(eb);
2037 	btrfs_set_header_flags(eb, flags | flag);
2038 	return (flags & flag) == flag;
2039 }
2040 
2041 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2042 {
2043 	u64 flags = btrfs_header_flags(eb);
2044 	btrfs_set_header_flags(eb, flags & ~flag);
2045 	return (flags & flag) == flag;
2046 }
2047 
2048 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2049 {
2050 	u64 flags = btrfs_header_flags(eb);
2051 	return flags >> BTRFS_BACKREF_REV_SHIFT;
2052 }
2053 
2054 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2055 						int rev)
2056 {
2057 	u64 flags = btrfs_header_flags(eb);
2058 	flags &= ~BTRFS_BACKREF_REV_MASK;
2059 	flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2060 	btrfs_set_header_flags(eb, flags);
2061 }
2062 
2063 static inline unsigned long btrfs_header_fsid(void)
2064 {
2065 	return offsetof(struct btrfs_header, fsid);
2066 }
2067 
2068 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2069 {
2070 	return offsetof(struct btrfs_header, chunk_tree_uuid);
2071 }
2072 
2073 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2074 {
2075 	return btrfs_header_level(eb) == 0;
2076 }
2077 
2078 /* struct btrfs_root_item */
2079 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2080 		   generation, 64);
2081 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2082 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2083 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2084 
2085 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2086 			 generation, 64);
2087 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2088 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2089 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2090 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2091 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2092 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2093 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2094 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2095 			 last_snapshot, 64);
2096 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2097 			 generation_v2, 64);
2098 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2099 			 ctransid, 64);
2100 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2101 			 otransid, 64);
2102 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2103 			 stransid, 64);
2104 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2105 			 rtransid, 64);
2106 
2107 static inline bool btrfs_root_readonly(struct btrfs_root *root)
2108 {
2109 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2110 }
2111 
2112 static inline bool btrfs_root_dead(struct btrfs_root *root)
2113 {
2114 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2115 }
2116 
2117 /* struct btrfs_root_backup */
2118 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2119 		   tree_root, 64);
2120 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2121 		   tree_root_gen, 64);
2122 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2123 		   tree_root_level, 8);
2124 
2125 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2126 		   chunk_root, 64);
2127 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2128 		   chunk_root_gen, 64);
2129 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2130 		   chunk_root_level, 8);
2131 
2132 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2133 		   extent_root, 64);
2134 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2135 		   extent_root_gen, 64);
2136 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2137 		   extent_root_level, 8);
2138 
2139 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2140 		   fs_root, 64);
2141 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2142 		   fs_root_gen, 64);
2143 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2144 		   fs_root_level, 8);
2145 
2146 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2147 		   dev_root, 64);
2148 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2149 		   dev_root_gen, 64);
2150 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2151 		   dev_root_level, 8);
2152 
2153 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2154 		   csum_root, 64);
2155 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2156 		   csum_root_gen, 64);
2157 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2158 		   csum_root_level, 8);
2159 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2160 		   total_bytes, 64);
2161 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2162 		   bytes_used, 64);
2163 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2164 		   num_devices, 64);
2165 
2166 /* struct btrfs_balance_item */
2167 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2168 
2169 static inline void btrfs_balance_data(struct extent_buffer *eb,
2170 				      struct btrfs_balance_item *bi,
2171 				      struct btrfs_disk_balance_args *ba)
2172 {
2173 	read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2174 }
2175 
2176 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2177 					  struct btrfs_balance_item *bi,
2178 					  struct btrfs_disk_balance_args *ba)
2179 {
2180 	write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2181 }
2182 
2183 static inline void btrfs_balance_meta(struct extent_buffer *eb,
2184 				      struct btrfs_balance_item *bi,
2185 				      struct btrfs_disk_balance_args *ba)
2186 {
2187 	read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2188 }
2189 
2190 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2191 					  struct btrfs_balance_item *bi,
2192 					  struct btrfs_disk_balance_args *ba)
2193 {
2194 	write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2195 }
2196 
2197 static inline void btrfs_balance_sys(struct extent_buffer *eb,
2198 				     struct btrfs_balance_item *bi,
2199 				     struct btrfs_disk_balance_args *ba)
2200 {
2201 	read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2202 }
2203 
2204 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2205 					 struct btrfs_balance_item *bi,
2206 					 struct btrfs_disk_balance_args *ba)
2207 {
2208 	write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2209 }
2210 
2211 static inline void
2212 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2213 			       struct btrfs_disk_balance_args *disk)
2214 {
2215 	memset(cpu, 0, sizeof(*cpu));
2216 
2217 	cpu->profiles = le64_to_cpu(disk->profiles);
2218 	cpu->usage = le64_to_cpu(disk->usage);
2219 	cpu->devid = le64_to_cpu(disk->devid);
2220 	cpu->pstart = le64_to_cpu(disk->pstart);
2221 	cpu->pend = le64_to_cpu(disk->pend);
2222 	cpu->vstart = le64_to_cpu(disk->vstart);
2223 	cpu->vend = le64_to_cpu(disk->vend);
2224 	cpu->target = le64_to_cpu(disk->target);
2225 	cpu->flags = le64_to_cpu(disk->flags);
2226 	cpu->limit = le64_to_cpu(disk->limit);
2227 	cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2228 	cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2229 }
2230 
2231 static inline void
2232 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2233 			       struct btrfs_balance_args *cpu)
2234 {
2235 	memset(disk, 0, sizeof(*disk));
2236 
2237 	disk->profiles = cpu_to_le64(cpu->profiles);
2238 	disk->usage = cpu_to_le64(cpu->usage);
2239 	disk->devid = cpu_to_le64(cpu->devid);
2240 	disk->pstart = cpu_to_le64(cpu->pstart);
2241 	disk->pend = cpu_to_le64(cpu->pend);
2242 	disk->vstart = cpu_to_le64(cpu->vstart);
2243 	disk->vend = cpu_to_le64(cpu->vend);
2244 	disk->target = cpu_to_le64(cpu->target);
2245 	disk->flags = cpu_to_le64(cpu->flags);
2246 	disk->limit = cpu_to_le64(cpu->limit);
2247 	disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2248 	disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2249 }
2250 
2251 /* struct btrfs_super_block */
2252 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2253 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2254 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2255 			 generation, 64);
2256 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2257 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2258 			 struct btrfs_super_block, sys_chunk_array_size, 32);
2259 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2260 			 struct btrfs_super_block, chunk_root_generation, 64);
2261 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2262 			 root_level, 8);
2263 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2264 			 chunk_root, 64);
2265 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2266 			 chunk_root_level, 8);
2267 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2268 			 log_root, 64);
2269 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2270 			 log_root_transid, 64);
2271 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2272 			 log_root_level, 8);
2273 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2274 			 total_bytes, 64);
2275 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2276 			 bytes_used, 64);
2277 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2278 			 sectorsize, 32);
2279 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2280 			 nodesize, 32);
2281 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2282 			 stripesize, 32);
2283 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2284 			 root_dir_objectid, 64);
2285 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2286 			 num_devices, 64);
2287 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2288 			 compat_flags, 64);
2289 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2290 			 compat_ro_flags, 64);
2291 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2292 			 incompat_flags, 64);
2293 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2294 			 csum_type, 16);
2295 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2296 			 cache_generation, 64);
2297 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2298 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2299 			 uuid_tree_generation, 64);
2300 
2301 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2302 {
2303 	u16 t = btrfs_super_csum_type(s);
2304 	/*
2305 	 * csum type is validated at mount time
2306 	 */
2307 	return btrfs_csum_sizes[t];
2308 }
2309 
2310 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2311 {
2312 	return offsetof(struct btrfs_leaf, items);
2313 }
2314 
2315 /*
2316  * The leaf data grows from end-to-front in the node.
2317  * this returns the address of the start of the last item,
2318  * which is the stop of the leaf data stack
2319  */
2320 static inline unsigned int leaf_data_end(struct btrfs_fs_info *fs_info,
2321 					 struct extent_buffer *leaf)
2322 {
2323 	u32 nr = btrfs_header_nritems(leaf);
2324 
2325 	if (nr == 0)
2326 		return BTRFS_LEAF_DATA_SIZE(fs_info);
2327 	return btrfs_item_offset_nr(leaf, nr - 1);
2328 }
2329 
2330 /* struct btrfs_file_extent_item */
2331 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2332 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2333 			 struct btrfs_file_extent_item, disk_bytenr, 64);
2334 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2335 			 struct btrfs_file_extent_item, offset, 64);
2336 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2337 			 struct btrfs_file_extent_item, generation, 64);
2338 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2339 			 struct btrfs_file_extent_item, num_bytes, 64);
2340 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2341 			 struct btrfs_file_extent_item, disk_num_bytes, 64);
2342 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2343 			 struct btrfs_file_extent_item, compression, 8);
2344 
2345 static inline unsigned long
2346 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2347 {
2348 	return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2349 }
2350 
2351 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2352 {
2353 	return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2354 }
2355 
2356 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2357 		   disk_bytenr, 64);
2358 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2359 		   generation, 64);
2360 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2361 		   disk_num_bytes, 64);
2362 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2363 		  offset, 64);
2364 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2365 		   num_bytes, 64);
2366 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2367 		   ram_bytes, 64);
2368 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2369 		   compression, 8);
2370 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2371 		   encryption, 8);
2372 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2373 		   other_encoding, 16);
2374 
2375 /*
2376  * this returns the number of bytes used by the item on disk, minus the
2377  * size of any extent headers.  If a file is compressed on disk, this is
2378  * the compressed size
2379  */
2380 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2381 						    struct btrfs_item *e)
2382 {
2383 	return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2384 }
2385 
2386 /* this returns the number of file bytes represented by the inline item.
2387  * If an item is compressed, this is the uncompressed size
2388  */
2389 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2390 					       int slot,
2391 					       struct btrfs_file_extent_item *fi)
2392 {
2393 	struct btrfs_map_token token;
2394 
2395 	btrfs_init_map_token(&token);
2396 	/*
2397 	 * return the space used on disk if this item isn't
2398 	 * compressed or encoded
2399 	 */
2400 	if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
2401 	    btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
2402 	    btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
2403 		return btrfs_file_extent_inline_item_len(eb,
2404 							 btrfs_item_nr(slot));
2405 	}
2406 
2407 	/* otherwise use the ram bytes field */
2408 	return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
2409 }
2410 
2411 
2412 /* btrfs_dev_stats_item */
2413 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
2414 					struct btrfs_dev_stats_item *ptr,
2415 					int index)
2416 {
2417 	u64 val;
2418 
2419 	read_extent_buffer(eb, &val,
2420 			   offsetof(struct btrfs_dev_stats_item, values) +
2421 			    ((unsigned long)ptr) + (index * sizeof(u64)),
2422 			   sizeof(val));
2423 	return val;
2424 }
2425 
2426 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2427 					     struct btrfs_dev_stats_item *ptr,
2428 					     int index, u64 val)
2429 {
2430 	write_extent_buffer(eb, &val,
2431 			    offsetof(struct btrfs_dev_stats_item, values) +
2432 			     ((unsigned long)ptr) + (index * sizeof(u64)),
2433 			    sizeof(val));
2434 }
2435 
2436 /* btrfs_qgroup_status_item */
2437 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2438 		   generation, 64);
2439 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2440 		   version, 64);
2441 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2442 		   flags, 64);
2443 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2444 		   rescan, 64);
2445 
2446 /* btrfs_qgroup_info_item */
2447 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2448 		   generation, 64);
2449 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2450 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2451 		   rfer_cmpr, 64);
2452 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2453 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2454 		   excl_cmpr, 64);
2455 
2456 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2457 			 struct btrfs_qgroup_info_item, generation, 64);
2458 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2459 			 rfer, 64);
2460 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2461 			 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2462 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2463 			 excl, 64);
2464 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2465 			 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2466 
2467 /* btrfs_qgroup_limit_item */
2468 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2469 		   flags, 64);
2470 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2471 		   max_rfer, 64);
2472 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2473 		   max_excl, 64);
2474 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2475 		   rsv_rfer, 64);
2476 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2477 		   rsv_excl, 64);
2478 
2479 /* btrfs_dev_replace_item */
2480 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2481 		   struct btrfs_dev_replace_item, src_devid, 64);
2482 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2483 		   struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2484 		   64);
2485 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2486 		   replace_state, 64);
2487 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2488 		   time_started, 64);
2489 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2490 		   time_stopped, 64);
2491 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2492 		   num_write_errors, 64);
2493 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2494 		   struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2495 		   64);
2496 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2497 		   cursor_left, 64);
2498 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2499 		   cursor_right, 64);
2500 
2501 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2502 			 struct btrfs_dev_replace_item, src_devid, 64);
2503 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2504 			 struct btrfs_dev_replace_item,
2505 			 cont_reading_from_srcdev_mode, 64);
2506 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2507 			 struct btrfs_dev_replace_item, replace_state, 64);
2508 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2509 			 struct btrfs_dev_replace_item, time_started, 64);
2510 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2511 			 struct btrfs_dev_replace_item, time_stopped, 64);
2512 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2513 			 struct btrfs_dev_replace_item, num_write_errors, 64);
2514 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2515 			 struct btrfs_dev_replace_item,
2516 			 num_uncorrectable_read_errors, 64);
2517 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2518 			 struct btrfs_dev_replace_item, cursor_left, 64);
2519 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2520 			 struct btrfs_dev_replace_item, cursor_right, 64);
2521 
2522 /* helper function to cast into the data area of the leaf. */
2523 #define btrfs_item_ptr(leaf, slot, type) \
2524 	((type *)(btrfs_leaf_data(leaf) + \
2525 	btrfs_item_offset_nr(leaf, slot)))
2526 
2527 #define btrfs_item_ptr_offset(leaf, slot) \
2528 	((unsigned long)(btrfs_leaf_data(leaf) + \
2529 	btrfs_item_offset_nr(leaf, slot)))
2530 
2531 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2532 {
2533 	return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2534 		(space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2535 }
2536 
2537 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2538 {
2539 	return mapping_gfp_constraint(mapping, ~__GFP_FS);
2540 }
2541 
2542 /* extent-tree.c */
2543 
2544 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2545 
2546 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2547 						 unsigned num_items)
2548 {
2549 	return fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2550 }
2551 
2552 /*
2553  * Doing a truncate won't result in new nodes or leaves, just what we need for
2554  * COW.
2555  */
2556 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2557 						 unsigned num_items)
2558 {
2559 	return fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2560 }
2561 
2562 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
2563 				       struct btrfs_fs_info *fs_info);
2564 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
2565 				       struct btrfs_fs_info *fs_info);
2566 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2567 					 const u64 start);
2568 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2569 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2570 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2571 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2572 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2573 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2574 			   struct btrfs_fs_info *fs_info, unsigned long count);
2575 int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2576 				 unsigned long count, u64 transid, int wait);
2577 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2578 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2579 			     struct btrfs_fs_info *fs_info, u64 bytenr,
2580 			     u64 offset, int metadata, u64 *refs, u64 *flags);
2581 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2582 		     u64 bytenr, u64 num, int reserved);
2583 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2584 				    u64 bytenr, u64 num_bytes);
2585 int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2586 				 struct extent_buffer *eb);
2587 int btrfs_cross_ref_exist(struct btrfs_root *root,
2588 			  u64 objectid, u64 offset, u64 bytenr);
2589 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2590 						 struct btrfs_fs_info *info,
2591 						 u64 bytenr);
2592 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2593 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2594 int get_block_group_index(struct btrfs_block_group_cache *cache);
2595 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2596 					     struct btrfs_root *root,
2597 					     u64 parent, u64 root_objectid,
2598 					     const struct btrfs_disk_key *key,
2599 					     int level, u64 hint,
2600 					     u64 empty_size);
2601 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2602 			   struct btrfs_root *root,
2603 			   struct extent_buffer *buf,
2604 			   u64 parent, int last_ref);
2605 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2606 				     u64 root_objectid, u64 owner,
2607 				     u64 offset, u64 ram_bytes,
2608 				     struct btrfs_key *ins);
2609 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2610 				   struct btrfs_fs_info *fs_info,
2611 				   u64 root_objectid, u64 owner, u64 offset,
2612 				   struct btrfs_key *ins);
2613 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2614 			 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2615 			 struct btrfs_key *ins, int is_data, int delalloc);
2616 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2617 		  struct extent_buffer *buf, int full_backref);
2618 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2619 		  struct extent_buffer *buf, int full_backref);
2620 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2621 				struct btrfs_fs_info *fs_info,
2622 				u64 bytenr, u64 num_bytes, u64 flags,
2623 				int level, int is_data);
2624 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2625 		      struct btrfs_fs_info *fs_info,
2626 		      u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2627 		      u64 owner, u64 offset);
2628 
2629 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2630 			       u64 start, u64 len, int delalloc);
2631 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2632 				       u64 start, u64 len);
2633 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2634 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2635 			       struct btrfs_fs_info *fs_info);
2636 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2637 			 struct btrfs_fs_info *fs_info,
2638 			 u64 bytenr, u64 num_bytes, u64 parent,
2639 			 u64 root_objectid, u64 owner, u64 offset);
2640 
2641 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
2642 				   struct btrfs_fs_info *fs_info);
2643 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2644 				   struct btrfs_fs_info *fs_info);
2645 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2646 			    struct btrfs_fs_info *fs_info);
2647 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2648 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2649 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2650 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2651 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2652 			   struct btrfs_fs_info *fs_info, u64 bytes_used,
2653 			   u64 type, u64 chunk_objectid, u64 chunk_offset,
2654 			   u64 size);
2655 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2656 				struct btrfs_fs_info *fs_info,
2657 				const u64 chunk_offset);
2658 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2659 			     struct btrfs_fs_info *fs_info, u64 group_start,
2660 			     struct extent_map *em);
2661 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2662 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2663 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2664 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
2665 				       struct btrfs_fs_info *fs_info);
2666 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
2667 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2668 
2669 enum btrfs_reserve_flush_enum {
2670 	/* If we are in the transaction, we can't flush anything.*/
2671 	BTRFS_RESERVE_NO_FLUSH,
2672 	/*
2673 	 * Flushing delalloc may cause deadlock somewhere, in this
2674 	 * case, use FLUSH LIMIT
2675 	 */
2676 	BTRFS_RESERVE_FLUSH_LIMIT,
2677 	BTRFS_RESERVE_FLUSH_ALL,
2678 };
2679 
2680 enum btrfs_flush_state {
2681 	FLUSH_DELAYED_ITEMS_NR	=	1,
2682 	FLUSH_DELAYED_ITEMS	=	2,
2683 	FLUSH_DELALLOC		=	3,
2684 	FLUSH_DELALLOC_WAIT	=	4,
2685 	ALLOC_CHUNK		=	5,
2686 	COMMIT_TRANS		=	6,
2687 };
2688 
2689 int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len);
2690 int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes);
2691 void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len);
2692 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2693 					    u64 len);
2694 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
2695 				  struct btrfs_fs_info *fs_info);
2696 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2697 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
2698 				  struct inode *inode);
2699 void btrfs_orphan_release_metadata(struct inode *inode);
2700 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2701 				     struct btrfs_block_rsv *rsv,
2702 				     int nitems,
2703 				     u64 *qgroup_reserved, bool use_global_rsv);
2704 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2705 				      struct btrfs_block_rsv *rsv);
2706 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
2707 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
2708 int btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len);
2709 void btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len);
2710 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2711 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2712 					      unsigned short type);
2713 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2714 			  struct btrfs_block_rsv *rsv);
2715 void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv);
2716 int btrfs_block_rsv_add(struct btrfs_root *root,
2717 			struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2718 			enum btrfs_reserve_flush_enum flush);
2719 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2720 int btrfs_block_rsv_refill(struct btrfs_root *root,
2721 			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2722 			   enum btrfs_reserve_flush_enum flush);
2723 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2724 			    struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2725 			    int update_size);
2726 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2727 			     struct btrfs_block_rsv *dest, u64 num_bytes,
2728 			     int min_factor);
2729 void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2730 			     struct btrfs_block_rsv *block_rsv,
2731 			     u64 num_bytes);
2732 int btrfs_inc_block_group_ro(struct btrfs_fs_info *fs_info,
2733 			     struct btrfs_block_group_cache *cache);
2734 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2735 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2736 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2737 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2738 				   u64 start, u64 end);
2739 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2740 			 u64 num_bytes, u64 *actual_bytes);
2741 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
2742 			    struct btrfs_fs_info *fs_info, u64 type);
2743 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2744 
2745 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2746 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2747 					 struct btrfs_fs_info *fs_info);
2748 int __get_raid_index(u64 flags);
2749 int btrfs_start_write_no_snapshoting(struct btrfs_root *root);
2750 void btrfs_end_write_no_snapshoting(struct btrfs_root *root);
2751 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2752 void check_system_chunk(struct btrfs_trans_handle *trans,
2753 			struct btrfs_fs_info *fs_info, const u64 type);
2754 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2755 		       struct btrfs_fs_info *info, u64 start, u64 end);
2756 
2757 /* ctree.c */
2758 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2759 		     int level, int *slot);
2760 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2761 int btrfs_previous_item(struct btrfs_root *root,
2762 			struct btrfs_path *path, u64 min_objectid,
2763 			int type);
2764 int btrfs_previous_extent_item(struct btrfs_root *root,
2765 			struct btrfs_path *path, u64 min_objectid);
2766 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2767 			     struct btrfs_path *path,
2768 			     const struct btrfs_key *new_key);
2769 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2770 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2771 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2772 			struct btrfs_key *key, int lowest_level,
2773 			u64 min_trans);
2774 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2775 			 struct btrfs_path *path,
2776 			 u64 min_trans);
2777 enum btrfs_compare_tree_result {
2778 	BTRFS_COMPARE_TREE_NEW,
2779 	BTRFS_COMPARE_TREE_DELETED,
2780 	BTRFS_COMPARE_TREE_CHANGED,
2781 	BTRFS_COMPARE_TREE_SAME,
2782 };
2783 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
2784 				  struct btrfs_root *right_root,
2785 				  struct btrfs_path *left_path,
2786 				  struct btrfs_path *right_path,
2787 				  struct btrfs_key *key,
2788 				  enum btrfs_compare_tree_result result,
2789 				  void *ctx);
2790 int btrfs_compare_trees(struct btrfs_root *left_root,
2791 			struct btrfs_root *right_root,
2792 			btrfs_changed_cb_t cb, void *ctx);
2793 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2794 		    struct btrfs_root *root, struct extent_buffer *buf,
2795 		    struct extent_buffer *parent, int parent_slot,
2796 		    struct extent_buffer **cow_ret);
2797 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2798 		      struct btrfs_root *root,
2799 		      struct extent_buffer *buf,
2800 		      struct extent_buffer **cow_ret, u64 new_root_objectid);
2801 int btrfs_block_can_be_shared(struct btrfs_root *root,
2802 			      struct extent_buffer *buf);
2803 void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2804 		       u32 data_size);
2805 void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2806 			 struct btrfs_path *path, u32 new_size, int from_end);
2807 int btrfs_split_item(struct btrfs_trans_handle *trans,
2808 		     struct btrfs_root *root,
2809 		     struct btrfs_path *path,
2810 		     const struct btrfs_key *new_key,
2811 		     unsigned long split_offset);
2812 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2813 			 struct btrfs_root *root,
2814 			 struct btrfs_path *path,
2815 			 const struct btrfs_key *new_key);
2816 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2817 		u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2818 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2819 		      const struct btrfs_key *key, struct btrfs_path *p,
2820 		      int ins_len, int cow);
2821 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2822 			  struct btrfs_path *p, u64 time_seq);
2823 int btrfs_search_slot_for_read(struct btrfs_root *root,
2824 			       const struct btrfs_key *key,
2825 			       struct btrfs_path *p, int find_higher,
2826 			       int return_any);
2827 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2828 		       struct btrfs_root *root, struct extent_buffer *parent,
2829 		       int start_slot, u64 *last_ret,
2830 		       struct btrfs_key *progress);
2831 void btrfs_release_path(struct btrfs_path *p);
2832 struct btrfs_path *btrfs_alloc_path(void);
2833 void btrfs_free_path(struct btrfs_path *p);
2834 void btrfs_set_path_blocking(struct btrfs_path *p);
2835 void btrfs_clear_path_blocking(struct btrfs_path *p,
2836 			       struct extent_buffer *held, int held_rw);
2837 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2838 
2839 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2840 		   struct btrfs_path *path, int slot, int nr);
2841 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2842 				 struct btrfs_root *root,
2843 				 struct btrfs_path *path)
2844 {
2845 	return btrfs_del_items(trans, root, path, path->slots[0], 1);
2846 }
2847 
2848 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2849 			    const struct btrfs_key *cpu_key, u32 *data_size,
2850 			    u32 total_data, u32 total_size, int nr);
2851 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2852 		      const struct btrfs_key *key, void *data, u32 data_size);
2853 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2854 			     struct btrfs_root *root,
2855 			     struct btrfs_path *path,
2856 			     const struct btrfs_key *cpu_key, u32 *data_size,
2857 			     int nr);
2858 
2859 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2860 					  struct btrfs_root *root,
2861 					  struct btrfs_path *path,
2862 					  const struct btrfs_key *key,
2863 					  u32 data_size)
2864 {
2865 	return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2866 }
2867 
2868 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2869 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2870 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2871 			u64 time_seq);
2872 static inline int btrfs_next_old_item(struct btrfs_root *root,
2873 				      struct btrfs_path *p, u64 time_seq)
2874 {
2875 	++p->slots[0];
2876 	if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2877 		return btrfs_next_old_leaf(root, p, time_seq);
2878 	return 0;
2879 }
2880 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2881 {
2882 	return btrfs_next_old_item(root, p, 0);
2883 }
2884 int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
2885 			  struct extent_buffer *leaf);
2886 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2887 				     struct btrfs_block_rsv *block_rsv,
2888 				     int update_ref, int for_reloc);
2889 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2890 			struct btrfs_root *root,
2891 			struct extent_buffer *node,
2892 			struct extent_buffer *parent);
2893 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2894 {
2895 	/*
2896 	 * Do it this way so we only ever do one test_bit in the normal case.
2897 	 */
2898 	if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2899 		if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2900 			return 2;
2901 		return 1;
2902 	}
2903 	return 0;
2904 }
2905 
2906 /*
2907  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2908  * anything except sleeping. This function is used to check the status of
2909  * the fs.
2910  */
2911 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2912 {
2913 	return fs_info->sb->s_flags & MS_RDONLY || btrfs_fs_closing(fs_info);
2914 }
2915 
2916 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2917 {
2918 	kfree(fs_info->balance_ctl);
2919 	kfree(fs_info->delayed_root);
2920 	kfree(fs_info->extent_root);
2921 	kfree(fs_info->tree_root);
2922 	kfree(fs_info->chunk_root);
2923 	kfree(fs_info->dev_root);
2924 	kfree(fs_info->csum_root);
2925 	kfree(fs_info->quota_root);
2926 	kfree(fs_info->uuid_root);
2927 	kfree(fs_info->free_space_root);
2928 	kfree(fs_info->super_copy);
2929 	kfree(fs_info->super_for_commit);
2930 	security_free_mnt_opts(&fs_info->security_opts);
2931 	kfree(fs_info);
2932 }
2933 
2934 /* tree mod log functions from ctree.c */
2935 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2936 			   struct seq_list *elem);
2937 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2938 			    struct seq_list *elem);
2939 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2940 
2941 /* root-item.c */
2942 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2943 		       struct btrfs_fs_info *fs_info,
2944 		       u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2945 		       const char *name, int name_len);
2946 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2947 		       struct btrfs_fs_info *fs_info,
2948 		       u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2949 		       const char *name, int name_len);
2950 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2951 		   const struct btrfs_key *key);
2952 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2953 		      const struct btrfs_key *key,
2954 		      struct btrfs_root_item *item);
2955 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2956 				   struct btrfs_root *root,
2957 				   struct btrfs_key *key,
2958 				   struct btrfs_root_item *item);
2959 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
2960 		    struct btrfs_path *path, struct btrfs_root_item *root_item,
2961 		    struct btrfs_key *root_key);
2962 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
2963 void btrfs_set_root_node(struct btrfs_root_item *item,
2964 			 struct extent_buffer *node);
2965 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2966 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2967 			     struct btrfs_root *root);
2968 
2969 /* uuid-tree.c */
2970 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
2971 			struct btrfs_fs_info *fs_info, u8 *uuid, u8 type,
2972 			u64 subid);
2973 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
2974 			struct btrfs_fs_info *fs_info, u8 *uuid, u8 type,
2975 			u64 subid);
2976 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
2977 			    int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
2978 					      u64));
2979 
2980 /* dir-item.c */
2981 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
2982 			  const char *name, int name_len);
2983 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2984 			  struct btrfs_root *root, const char *name,
2985 			  int name_len, struct inode *dir,
2986 			  struct btrfs_key *location, u8 type, u64 index);
2987 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2988 					     struct btrfs_root *root,
2989 					     struct btrfs_path *path, u64 dir,
2990 					     const char *name, int name_len,
2991 					     int mod);
2992 struct btrfs_dir_item *
2993 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2994 			    struct btrfs_root *root,
2995 			    struct btrfs_path *path, u64 dir,
2996 			    u64 objectid, const char *name, int name_len,
2997 			    int mod);
2998 struct btrfs_dir_item *
2999 btrfs_search_dir_index_item(struct btrfs_root *root,
3000 			    struct btrfs_path *path, u64 dirid,
3001 			    const char *name, int name_len);
3002 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3003 			      struct btrfs_root *root,
3004 			      struct btrfs_path *path,
3005 			      struct btrfs_dir_item *di);
3006 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3007 			    struct btrfs_root *root,
3008 			    struct btrfs_path *path, u64 objectid,
3009 			    const char *name, u16 name_len,
3010 			    const void *data, u16 data_len);
3011 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3012 					  struct btrfs_root *root,
3013 					  struct btrfs_path *path, u64 dir,
3014 					  const char *name, u16 name_len,
3015 					  int mod);
3016 int verify_dir_item(struct btrfs_fs_info *fs_info,
3017 		    struct extent_buffer *leaf,
3018 		    struct btrfs_dir_item *dir_item);
3019 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3020 						 struct btrfs_path *path,
3021 						 const char *name,
3022 						 int name_len);
3023 
3024 /* orphan.c */
3025 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3026 			     struct btrfs_root *root, u64 offset);
3027 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3028 			  struct btrfs_root *root, u64 offset);
3029 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3030 
3031 /* inode-item.c */
3032 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3033 			   struct btrfs_root *root,
3034 			   const char *name, int name_len,
3035 			   u64 inode_objectid, u64 ref_objectid, u64 index);
3036 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3037 			   struct btrfs_root *root,
3038 			   const char *name, int name_len,
3039 			   u64 inode_objectid, u64 ref_objectid, u64 *index);
3040 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3041 			     struct btrfs_root *root,
3042 			     struct btrfs_path *path, u64 objectid);
3043 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3044 		       *root, struct btrfs_path *path,
3045 		       struct btrfs_key *location, int mod);
3046 
3047 struct btrfs_inode_extref *
3048 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3049 			  struct btrfs_root *root,
3050 			  struct btrfs_path *path,
3051 			  const char *name, int name_len,
3052 			  u64 inode_objectid, u64 ref_objectid, int ins_len,
3053 			  int cow);
3054 
3055 int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
3056 				   u64 ref_objectid, const char *name,
3057 				   int name_len,
3058 				   struct btrfs_inode_extref **extref_ret);
3059 
3060 /* file-item.c */
3061 struct btrfs_dio_private;
3062 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3063 		    struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
3064 int btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3065 int btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3066 			      u64 logical_offset);
3067 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3068 			     struct btrfs_root *root,
3069 			     u64 objectid, u64 pos,
3070 			     u64 disk_offset, u64 disk_num_bytes,
3071 			     u64 num_bytes, u64 offset, u64 ram_bytes,
3072 			     u8 compression, u8 encryption, u16 other_encoding);
3073 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3074 			     struct btrfs_root *root,
3075 			     struct btrfs_path *path, u64 objectid,
3076 			     u64 bytenr, int mod);
3077 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3078 			   struct btrfs_root *root,
3079 			   struct btrfs_ordered_sum *sums);
3080 int btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3081 		       u64 file_start, int contig);
3082 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3083 			     struct list_head *list, int search_commit);
3084 void btrfs_extent_item_to_extent_map(struct inode *inode,
3085 				     const struct btrfs_path *path,
3086 				     struct btrfs_file_extent_item *fi,
3087 				     const bool new_inline,
3088 				     struct extent_map *em);
3089 
3090 /* inode.c */
3091 struct btrfs_delalloc_work {
3092 	struct inode *inode;
3093 	int delay_iput;
3094 	struct completion completion;
3095 	struct list_head list;
3096 	struct btrfs_work work;
3097 };
3098 
3099 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3100 						    int delay_iput);
3101 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3102 
3103 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3104 					   size_t pg_offset, u64 start, u64 len,
3105 					   int create);
3106 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3107 			      u64 *orig_start, u64 *orig_block_len,
3108 			      u64 *ram_bytes);
3109 
3110 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3111 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3112 #define ClearPageChecked ClearPageFsMisc
3113 #define SetPageChecked SetPageFsMisc
3114 #define PageChecked PageFsMisc
3115 #endif
3116 
3117 /* This forces readahead on a given range of bytes in an inode */
3118 static inline void btrfs_force_ra(struct address_space *mapping,
3119 				  struct file_ra_state *ra, struct file *file,
3120 				  pgoff_t offset, unsigned long req_size)
3121 {
3122 	page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3123 }
3124 
3125 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3126 int btrfs_set_inode_index(struct inode *dir, u64 *index);
3127 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3128 		       struct btrfs_root *root,
3129 		       struct btrfs_inode *dir, struct btrfs_inode *inode,
3130 		       const char *name, int name_len);
3131 int btrfs_add_link(struct btrfs_trans_handle *trans,
3132 		   struct inode *parent_inode, struct inode *inode,
3133 		   const char *name, int name_len, int add_backref, u64 index);
3134 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3135 			struct btrfs_root *root,
3136 			struct inode *dir, u64 objectid,
3137 			const char *name, int name_len);
3138 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3139 			int front);
3140 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3141 			       struct btrfs_root *root,
3142 			       struct inode *inode, u64 new_size,
3143 			       u32 min_type);
3144 
3145 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3146 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
3147 			       int nr);
3148 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3149 			      struct extent_state **cached_state, int dedupe);
3150 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3151 			     struct btrfs_root *new_root,
3152 			     struct btrfs_root *parent_root,
3153 			     u64 new_dirid);
3154 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3155 			 size_t size, struct bio *bio,
3156 			 unsigned long bio_flags);
3157 int btrfs_page_mkwrite(struct vm_fault *vmf);
3158 int btrfs_readpage(struct file *file, struct page *page);
3159 void btrfs_evict_inode(struct inode *inode);
3160 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3161 struct inode *btrfs_alloc_inode(struct super_block *sb);
3162 void btrfs_destroy_inode(struct inode *inode);
3163 int btrfs_drop_inode(struct inode *inode);
3164 int btrfs_init_cachep(void);
3165 void btrfs_destroy_cachep(void);
3166 long btrfs_ioctl_trans_end(struct file *file);
3167 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3168 			 struct btrfs_root *root, int *was_new);
3169 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3170 				    size_t pg_offset, u64 start, u64 end,
3171 				    int create);
3172 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3173 			      struct btrfs_root *root,
3174 			      struct inode *inode);
3175 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3176 				struct btrfs_root *root, struct inode *inode);
3177 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3178 int btrfs_orphan_cleanup(struct btrfs_root *root);
3179 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3180 			      struct btrfs_root *root);
3181 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3182 void btrfs_invalidate_inodes(struct btrfs_root *root);
3183 void btrfs_add_delayed_iput(struct inode *inode);
3184 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3185 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3186 			      u64 start, u64 num_bytes, u64 min_size,
3187 			      loff_t actual_len, u64 *alloc_hint);
3188 int btrfs_prealloc_file_range_trans(struct inode *inode,
3189 				    struct btrfs_trans_handle *trans, int mode,
3190 				    u64 start, u64 num_bytes, u64 min_size,
3191 				    loff_t actual_len, u64 *alloc_hint);
3192 extern const struct dentry_operations btrfs_dentry_operations;
3193 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3194 void btrfs_test_inode_set_ops(struct inode *inode);
3195 #endif
3196 
3197 /* ioctl.c */
3198 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3199 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3200 int btrfs_ioctl_get_supported_features(void __user *arg);
3201 void btrfs_update_iflags(struct inode *inode);
3202 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3203 int btrfs_is_empty_uuid(u8 *uuid);
3204 int btrfs_defrag_file(struct inode *inode, struct file *file,
3205 		      struct btrfs_ioctl_defrag_range_args *range,
3206 		      u64 newer_than, unsigned long max_pages);
3207 void btrfs_get_block_group_info(struct list_head *groups_list,
3208 				struct btrfs_ioctl_space_info *space);
3209 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3210 			       struct btrfs_ioctl_balance_args *bargs);
3211 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3212 			   struct file *dst_file, u64 dst_loff);
3213 
3214 /* file.c */
3215 int btrfs_auto_defrag_init(void);
3216 void btrfs_auto_defrag_exit(void);
3217 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3218 			   struct inode *inode);
3219 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3220 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3221 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3222 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3223 			     int skip_pinned);
3224 extern const struct file_operations btrfs_file_operations;
3225 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3226 			 struct btrfs_root *root, struct inode *inode,
3227 			 struct btrfs_path *path, u64 start, u64 end,
3228 			 u64 *drop_end, int drop_cache,
3229 			 int replace_extent,
3230 			 u32 extent_item_size,
3231 			 int *key_inserted);
3232 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3233 		       struct btrfs_root *root, struct inode *inode, u64 start,
3234 		       u64 end, int drop_cache);
3235 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3236 			      struct inode *inode, u64 start, u64 end);
3237 int btrfs_release_file(struct inode *inode, struct file *file);
3238 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3239 		      size_t num_pages, loff_t pos, size_t write_bytes,
3240 		      struct extent_state **cached);
3241 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3242 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
3243 			   struct file *file_out, loff_t pos_out, u64 len);
3244 
3245 /* tree-defrag.c */
3246 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3247 			struct btrfs_root *root);
3248 
3249 /* sysfs.c */
3250 int btrfs_init_sysfs(void);
3251 void btrfs_exit_sysfs(void);
3252 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3253 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3254 
3255 /* xattr.c */
3256 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3257 
3258 /* super.c */
3259 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3260 			unsigned long new_flags);
3261 int btrfs_sync_fs(struct super_block *sb, int wait);
3262 
3263 static inline __printf(2, 3)
3264 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3265 {
3266 }
3267 
3268 #ifdef CONFIG_PRINTK
3269 __printf(2, 3)
3270 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3271 #else
3272 #define btrfs_printk(fs_info, fmt, args...) \
3273 	btrfs_no_printk(fs_info, fmt, ##args)
3274 #endif
3275 
3276 #define btrfs_emerg(fs_info, fmt, args...) \
3277 	btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3278 #define btrfs_alert(fs_info, fmt, args...) \
3279 	btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3280 #define btrfs_crit(fs_info, fmt, args...) \
3281 	btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3282 #define btrfs_err(fs_info, fmt, args...) \
3283 	btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3284 #define btrfs_warn(fs_info, fmt, args...) \
3285 	btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3286 #define btrfs_notice(fs_info, fmt, args...) \
3287 	btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3288 #define btrfs_info(fs_info, fmt, args...) \
3289 	btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3290 
3291 /*
3292  * Wrappers that use printk_in_rcu
3293  */
3294 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3295 	btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3296 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3297 	btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3298 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3299 	btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3300 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3301 	btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3302 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3303 	btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3304 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3305 	btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3306 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3307 	btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3308 
3309 /*
3310  * Wrappers that use a ratelimited printk_in_rcu
3311  */
3312 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3313 	btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3314 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3315 	btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3316 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3317 	btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3318 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3319 	btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3320 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3321 	btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3322 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3323 	btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3324 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3325 	btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3326 
3327 /*
3328  * Wrappers that use a ratelimited printk
3329  */
3330 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3331 	btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3332 #define btrfs_alert_rl(fs_info, fmt, args...) \
3333 	btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3334 #define btrfs_crit_rl(fs_info, fmt, args...) \
3335 	btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3336 #define btrfs_err_rl(fs_info, fmt, args...) \
3337 	btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3338 #define btrfs_warn_rl(fs_info, fmt, args...) \
3339 	btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3340 #define btrfs_notice_rl(fs_info, fmt, args...) \
3341 	btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3342 #define btrfs_info_rl(fs_info, fmt, args...) \
3343 	btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3344 
3345 #if defined(CONFIG_DYNAMIC_DEBUG)
3346 #define btrfs_debug(fs_info, fmt, args...)				\
3347 do {									\
3348         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         	\
3349         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  	\
3350 		btrfs_printk(fs_info, KERN_DEBUG fmt, ##args);		\
3351 } while (0)
3352 #define btrfs_debug_in_rcu(fs_info, fmt, args...) 			\
3353 do {									\
3354         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); 	        \
3355         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) 		\
3356 		btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args);	\
3357 } while (0)
3358 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)			\
3359 do {									\
3360         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         	\
3361         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  	\
3362 		btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt,		\
3363 				       ##args);\
3364 } while (0)
3365 #define btrfs_debug_rl(fs_info, fmt, args...) 				\
3366 do {									\
3367         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         	\
3368         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  	\
3369 		btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt,	\
3370 					 ##args);			\
3371 } while (0)
3372 #elif defined(DEBUG)
3373 #define btrfs_debug(fs_info, fmt, args...) \
3374 	btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3375 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3376 	btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3377 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3378 	btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3379 #define btrfs_debug_rl(fs_info, fmt, args...) \
3380 	btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3381 #else
3382 #define btrfs_debug(fs_info, fmt, args...) \
3383 	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3384 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3385 	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3386 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3387 	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3388 #define btrfs_debug_rl(fs_info, fmt, args...) \
3389 	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3390 #endif
3391 
3392 #define btrfs_printk_in_rcu(fs_info, fmt, args...)	\
3393 do {							\
3394 	rcu_read_lock();				\
3395 	btrfs_printk(fs_info, fmt, ##args);		\
3396 	rcu_read_unlock();				\
3397 } while (0)
3398 
3399 #define btrfs_printk_ratelimited(fs_info, fmt, args...)		\
3400 do {								\
3401 	static DEFINE_RATELIMIT_STATE(_rs,			\
3402 		DEFAULT_RATELIMIT_INTERVAL,			\
3403 		DEFAULT_RATELIMIT_BURST);       		\
3404 	if (__ratelimit(&_rs))					\
3405 		btrfs_printk(fs_info, fmt, ##args);		\
3406 } while (0)
3407 
3408 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)		\
3409 do {								\
3410 	rcu_read_lock();					\
3411 	btrfs_printk_ratelimited(fs_info, fmt, ##args);		\
3412 	rcu_read_unlock();					\
3413 } while (0)
3414 
3415 #ifdef CONFIG_BTRFS_ASSERT
3416 
3417 __cold
3418 static inline void assfail(char *expr, char *file, int line)
3419 {
3420 	pr_err("assertion failed: %s, file: %s, line: %d\n",
3421 	       expr, file, line);
3422 	BUG();
3423 }
3424 
3425 #define ASSERT(expr)	\
3426 	(likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3427 #else
3428 #define ASSERT(expr)	((void)0)
3429 #endif
3430 
3431 __printf(5, 6)
3432 __cold
3433 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3434 		     unsigned int line, int errno, const char *fmt, ...);
3435 
3436 const char *btrfs_decode_error(int errno);
3437 
3438 __cold
3439 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3440 			       const char *function,
3441 			       unsigned int line, int errno);
3442 
3443 /*
3444  * Call btrfs_abort_transaction as early as possible when an error condition is
3445  * detected, that way the exact line number is reported.
3446  */
3447 #define btrfs_abort_transaction(trans, errno)		\
3448 do {								\
3449 	/* Report first abort since mount */			\
3450 	if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,	\
3451 			&((trans)->fs_info->fs_state))) {	\
3452 		if ((errno) != -EIO) {				\
3453 			WARN(1, KERN_DEBUG				\
3454 			"BTRFS: Transaction aborted (error %d)\n",	\
3455 			(errno));					\
3456 		} else {						\
3457 			btrfs_debug((trans)->fs_info,			\
3458 				    "Transaction aborted (error %d)", \
3459 				  (errno));			\
3460 		}						\
3461 	}							\
3462 	__btrfs_abort_transaction((trans), __func__,		\
3463 				  __LINE__, (errno));		\
3464 } while (0)
3465 
3466 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)		\
3467 do {								\
3468 	__btrfs_handle_fs_error((fs_info), __func__, __LINE__,	\
3469 			  (errno), fmt, ##args);		\
3470 } while (0)
3471 
3472 __printf(5, 6)
3473 __cold
3474 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3475 		   unsigned int line, int errno, const char *fmt, ...);
3476 /*
3477  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3478  * will panic().  Otherwise we BUG() here.
3479  */
3480 #define btrfs_panic(fs_info, errno, fmt, args...)			\
3481 do {									\
3482 	__btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args);	\
3483 	BUG();								\
3484 } while (0)
3485 
3486 
3487 /* compatibility and incompatibility defines */
3488 
3489 #define btrfs_set_fs_incompat(__fs_info, opt) \
3490 	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3491 
3492 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3493 					   u64 flag)
3494 {
3495 	struct btrfs_super_block *disk_super;
3496 	u64 features;
3497 
3498 	disk_super = fs_info->super_copy;
3499 	features = btrfs_super_incompat_flags(disk_super);
3500 	if (!(features & flag)) {
3501 		spin_lock(&fs_info->super_lock);
3502 		features = btrfs_super_incompat_flags(disk_super);
3503 		if (!(features & flag)) {
3504 			features |= flag;
3505 			btrfs_set_super_incompat_flags(disk_super, features);
3506 			btrfs_info(fs_info, "setting %llu feature flag",
3507 					 flag);
3508 		}
3509 		spin_unlock(&fs_info->super_lock);
3510 	}
3511 }
3512 
3513 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3514 	__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3515 
3516 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3517 					     u64 flag)
3518 {
3519 	struct btrfs_super_block *disk_super;
3520 	u64 features;
3521 
3522 	disk_super = fs_info->super_copy;
3523 	features = btrfs_super_incompat_flags(disk_super);
3524 	if (features & flag) {
3525 		spin_lock(&fs_info->super_lock);
3526 		features = btrfs_super_incompat_flags(disk_super);
3527 		if (features & flag) {
3528 			features &= ~flag;
3529 			btrfs_set_super_incompat_flags(disk_super, features);
3530 			btrfs_info(fs_info, "clearing %llu feature flag",
3531 					 flag);
3532 		}
3533 		spin_unlock(&fs_info->super_lock);
3534 	}
3535 }
3536 
3537 #define btrfs_fs_incompat(fs_info, opt) \
3538 	__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3539 
3540 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3541 {
3542 	struct btrfs_super_block *disk_super;
3543 	disk_super = fs_info->super_copy;
3544 	return !!(btrfs_super_incompat_flags(disk_super) & flag);
3545 }
3546 
3547 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3548 	__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3549 
3550 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3551 					    u64 flag)
3552 {
3553 	struct btrfs_super_block *disk_super;
3554 	u64 features;
3555 
3556 	disk_super = fs_info->super_copy;
3557 	features = btrfs_super_compat_ro_flags(disk_super);
3558 	if (!(features & flag)) {
3559 		spin_lock(&fs_info->super_lock);
3560 		features = btrfs_super_compat_ro_flags(disk_super);
3561 		if (!(features & flag)) {
3562 			features |= flag;
3563 			btrfs_set_super_compat_ro_flags(disk_super, features);
3564 			btrfs_info(fs_info, "setting %llu ro feature flag",
3565 				   flag);
3566 		}
3567 		spin_unlock(&fs_info->super_lock);
3568 	}
3569 }
3570 
3571 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3572 	__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3573 
3574 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3575 					      u64 flag)
3576 {
3577 	struct btrfs_super_block *disk_super;
3578 	u64 features;
3579 
3580 	disk_super = fs_info->super_copy;
3581 	features = btrfs_super_compat_ro_flags(disk_super);
3582 	if (features & flag) {
3583 		spin_lock(&fs_info->super_lock);
3584 		features = btrfs_super_compat_ro_flags(disk_super);
3585 		if (features & flag) {
3586 			features &= ~flag;
3587 			btrfs_set_super_compat_ro_flags(disk_super, features);
3588 			btrfs_info(fs_info, "clearing %llu ro feature flag",
3589 				   flag);
3590 		}
3591 		spin_unlock(&fs_info->super_lock);
3592 	}
3593 }
3594 
3595 #define btrfs_fs_compat_ro(fs_info, opt) \
3596 	__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3597 
3598 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3599 {
3600 	struct btrfs_super_block *disk_super;
3601 	disk_super = fs_info->super_copy;
3602 	return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3603 }
3604 
3605 /* acl.c */
3606 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3607 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3608 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3609 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3610 		   struct inode *inode, struct inode *dir);
3611 #else
3612 #define btrfs_get_acl NULL
3613 #define btrfs_set_acl NULL
3614 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3615 				 struct inode *inode, struct inode *dir)
3616 {
3617 	return 0;
3618 }
3619 #endif
3620 
3621 /* relocation.c */
3622 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3623 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3624 			  struct btrfs_root *root);
3625 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3626 			    struct btrfs_root *root);
3627 int btrfs_recover_relocation(struct btrfs_root *root);
3628 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3629 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3630 			  struct btrfs_root *root, struct extent_buffer *buf,
3631 			  struct extent_buffer *cow);
3632 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3633 			      u64 *bytes_to_reserve);
3634 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3635 			      struct btrfs_pending_snapshot *pending);
3636 
3637 /* scrub.c */
3638 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3639 		    u64 end, struct btrfs_scrub_progress *progress,
3640 		    int readonly, int is_dev_replace);
3641 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3642 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3643 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3644 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3645 			   struct btrfs_device *dev);
3646 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3647 			 struct btrfs_scrub_progress *progress);
3648 
3649 /* dev-replace.c */
3650 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3651 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3652 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3653 
3654 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3655 {
3656 	btrfs_bio_counter_sub(fs_info, 1);
3657 }
3658 
3659 /* reada.c */
3660 struct reada_control {
3661 	struct btrfs_fs_info	*fs_info;		/* tree to prefetch */
3662 	struct btrfs_key	key_start;
3663 	struct btrfs_key	key_end;	/* exclusive */
3664 	atomic_t		elems;
3665 	struct kref		refcnt;
3666 	wait_queue_head_t	wait;
3667 };
3668 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3669 			      struct btrfs_key *start, struct btrfs_key *end);
3670 int btrfs_reada_wait(void *handle);
3671 void btrfs_reada_detach(void *handle);
3672 int btree_readahead_hook(struct btrfs_fs_info *fs_info,
3673 			 struct extent_buffer *eb, int err);
3674 
3675 static inline int is_fstree(u64 rootid)
3676 {
3677 	if (rootid == BTRFS_FS_TREE_OBJECTID ||
3678 	    ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3679 	      !btrfs_qgroup_level(rootid)))
3680 		return 1;
3681 	return 0;
3682 }
3683 
3684 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3685 {
3686 	return signal_pending(current);
3687 }
3688 
3689 /* Sanity test specific functions */
3690 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3691 void btrfs_test_destroy_inode(struct inode *inode);
3692 #endif
3693 
3694 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3695 {
3696 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3697 	if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
3698 			      &fs_info->fs_state)))
3699 		return 1;
3700 #endif
3701 	return 0;
3702 }
3703 #endif
3704