xref: /openbmc/linux/fs/btrfs/ctree.h (revision f3539c12d8196ce0a1993364d30b3a18908470d1)
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 "extent_io.h"
41 #include "extent_map.h"
42 #include "async-thread.h"
43 
44 struct btrfs_trans_handle;
45 struct btrfs_transaction;
46 struct btrfs_pending_snapshot;
47 extern struct kmem_cache *btrfs_trans_handle_cachep;
48 extern struct kmem_cache *btrfs_transaction_cachep;
49 extern struct kmem_cache *btrfs_bit_radix_cachep;
50 extern struct kmem_cache *btrfs_path_cachep;
51 extern struct kmem_cache *btrfs_free_space_cachep;
52 struct btrfs_ordered_sum;
53 
54 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
55 #define STATIC noinline
56 #else
57 #define STATIC static noinline
58 #endif
59 
60 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
61 
62 #define BTRFS_MAX_MIRRORS 3
63 
64 #define BTRFS_MAX_LEVEL 8
65 
66 #define BTRFS_COMPAT_EXTENT_TREE_V0
67 
68 /*
69  * the max metadata block size.  This limit is somewhat artificial,
70  * but the memmove costs go through the roof for larger blocks.
71  */
72 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
73 
74 /*
75  * we can actually store much bigger names, but lets not confuse the rest
76  * of linux
77  */
78 #define BTRFS_NAME_LEN 255
79 
80 /*
81  * Theoretical limit is larger, but we keep this down to a sane
82  * value. That should limit greatly the possibility of collisions on
83  * inode ref items.
84  */
85 #define BTRFS_LINK_MAX 65535U
86 
87 static const int btrfs_csum_sizes[] = { 4 };
88 
89 /* four bytes for CRC32 */
90 #define BTRFS_EMPTY_DIR_SIZE 0
91 
92 /* specific to btrfs_map_block(), therefore not in include/linux/blk_types.h */
93 #define REQ_GET_READ_MIRRORS	(1 << 30)
94 
95 /* ioprio of readahead is set to idle */
96 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
97 
98 #define BTRFS_DIRTY_METADATA_THRESH	SZ_32M
99 
100 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
101 
102 struct btrfs_mapping_tree {
103 	struct extent_map_tree map_tree;
104 };
105 
106 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
107 {
108 	BUG_ON(num_stripes == 0);
109 	return sizeof(struct btrfs_chunk) +
110 		sizeof(struct btrfs_stripe) * (num_stripes - 1);
111 }
112 
113 /*
114  * File system states
115  */
116 #define BTRFS_FS_STATE_ERROR		0
117 #define BTRFS_FS_STATE_REMOUNTING	1
118 #define BTRFS_FS_STATE_TRANS_ABORTED	2
119 #define BTRFS_FS_STATE_DEV_REPLACING	3
120 #define BTRFS_FS_STATE_DUMMY_FS_INFO	4
121 
122 #define BTRFS_BACKREF_REV_MAX		256
123 #define BTRFS_BACKREF_REV_SHIFT		56
124 #define BTRFS_BACKREF_REV_MASK		(((u64)BTRFS_BACKREF_REV_MAX - 1) << \
125 					 BTRFS_BACKREF_REV_SHIFT)
126 
127 #define BTRFS_OLD_BACKREF_REV		0
128 #define BTRFS_MIXED_BACKREF_REV		1
129 
130 /*
131  * every tree block (leaf or node) starts with this header.
132  */
133 struct btrfs_header {
134 	/* these first four must match the super block */
135 	u8 csum[BTRFS_CSUM_SIZE];
136 	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
137 	__le64 bytenr; /* which block this node is supposed to live in */
138 	__le64 flags;
139 
140 	/* allowed to be different from the super from here on down */
141 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
142 	__le64 generation;
143 	__le64 owner;
144 	__le32 nritems;
145 	u8 level;
146 } __attribute__ ((__packed__));
147 
148 /*
149  * this is a very generous portion of the super block, giving us
150  * room to translate 14 chunks with 3 stripes each.
151  */
152 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
153 
154 /*
155  * just in case we somehow lose the roots and are not able to mount,
156  * we store an array of the roots from previous transactions
157  * in the super.
158  */
159 #define BTRFS_NUM_BACKUP_ROOTS 4
160 struct btrfs_root_backup {
161 	__le64 tree_root;
162 	__le64 tree_root_gen;
163 
164 	__le64 chunk_root;
165 	__le64 chunk_root_gen;
166 
167 	__le64 extent_root;
168 	__le64 extent_root_gen;
169 
170 	__le64 fs_root;
171 	__le64 fs_root_gen;
172 
173 	__le64 dev_root;
174 	__le64 dev_root_gen;
175 
176 	__le64 csum_root;
177 	__le64 csum_root_gen;
178 
179 	__le64 total_bytes;
180 	__le64 bytes_used;
181 	__le64 num_devices;
182 	/* future */
183 	__le64 unused_64[4];
184 
185 	u8 tree_root_level;
186 	u8 chunk_root_level;
187 	u8 extent_root_level;
188 	u8 fs_root_level;
189 	u8 dev_root_level;
190 	u8 csum_root_level;
191 	/* future and to align */
192 	u8 unused_8[10];
193 } __attribute__ ((__packed__));
194 
195 /*
196  * the super block basically lists the main trees of the FS
197  * it currently lacks any block count etc etc
198  */
199 struct btrfs_super_block {
200 	u8 csum[BTRFS_CSUM_SIZE];
201 	/* the first 4 fields must match struct btrfs_header */
202 	u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
203 	__le64 bytenr; /* this block number */
204 	__le64 flags;
205 
206 	/* allowed to be different from the btrfs_header from here own down */
207 	__le64 magic;
208 	__le64 generation;
209 	__le64 root;
210 	__le64 chunk_root;
211 	__le64 log_root;
212 
213 	/* this will help find the new super based on the log root */
214 	__le64 log_root_transid;
215 	__le64 total_bytes;
216 	__le64 bytes_used;
217 	__le64 root_dir_objectid;
218 	__le64 num_devices;
219 	__le32 sectorsize;
220 	__le32 nodesize;
221 	__le32 __unused_leafsize;
222 	__le32 stripesize;
223 	__le32 sys_chunk_array_size;
224 	__le64 chunk_root_generation;
225 	__le64 compat_flags;
226 	__le64 compat_ro_flags;
227 	__le64 incompat_flags;
228 	__le16 csum_type;
229 	u8 root_level;
230 	u8 chunk_root_level;
231 	u8 log_root_level;
232 	struct btrfs_dev_item dev_item;
233 
234 	char label[BTRFS_LABEL_SIZE];
235 
236 	__le64 cache_generation;
237 	__le64 uuid_tree_generation;
238 
239 	/* future expansion */
240 	__le64 reserved[30];
241 	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
242 	struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
243 } __attribute__ ((__packed__));
244 
245 /*
246  * Compat flags that we support.  If any incompat flags are set other than the
247  * ones specified below then we will fail to mount
248  */
249 #define BTRFS_FEATURE_COMPAT_SUPP		0ULL
250 #define BTRFS_FEATURE_COMPAT_SAFE_SET		0ULL
251 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR		0ULL
252 
253 #define BTRFS_FEATURE_COMPAT_RO_SUPP			\
254 	(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE)
255 
256 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET	0ULL
257 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR	0ULL
258 
259 #define BTRFS_FEATURE_INCOMPAT_SUPP			\
260 	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |		\
261 	 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |	\
262 	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
263 	 BTRFS_FEATURE_INCOMPAT_BIG_METADATA |		\
264 	 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |		\
265 	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
266 	 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
267 	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
268 	 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
269 
270 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET			\
271 	(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
272 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR		0ULL
273 
274 /*
275  * A leaf is full of items. offset and size tell us where to find
276  * the item in the leaf (relative to the start of the data area)
277  */
278 struct btrfs_item {
279 	struct btrfs_disk_key key;
280 	__le32 offset;
281 	__le32 size;
282 } __attribute__ ((__packed__));
283 
284 /*
285  * leaves have an item area and a data area:
286  * [item0, item1....itemN] [free space] [dataN...data1, data0]
287  *
288  * The data is separate from the items to get the keys closer together
289  * during searches.
290  */
291 struct btrfs_leaf {
292 	struct btrfs_header header;
293 	struct btrfs_item items[];
294 } __attribute__ ((__packed__));
295 
296 /*
297  * all non-leaf blocks are nodes, they hold only keys and pointers to
298  * other blocks
299  */
300 struct btrfs_key_ptr {
301 	struct btrfs_disk_key key;
302 	__le64 blockptr;
303 	__le64 generation;
304 } __attribute__ ((__packed__));
305 
306 struct btrfs_node {
307 	struct btrfs_header header;
308 	struct btrfs_key_ptr ptrs[];
309 } __attribute__ ((__packed__));
310 
311 /*
312  * btrfs_paths remember the path taken from the root down to the leaf.
313  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
314  * to any other levels that are present.
315  *
316  * The slots array records the index of the item or block pointer
317  * used while walking the tree.
318  */
319 enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
320 struct btrfs_path {
321 	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
322 	int slots[BTRFS_MAX_LEVEL];
323 	/* if there is real range locking, this locks field will change */
324 	u8 locks[BTRFS_MAX_LEVEL];
325 	u8 reada;
326 	/* keep some upper locks as we walk down */
327 	u8 lowest_level;
328 
329 	/*
330 	 * set by btrfs_split_item, tells search_slot to keep all locks
331 	 * and to force calls to keep space in the nodes
332 	 */
333 	unsigned int search_for_split:1;
334 	unsigned int keep_locks:1;
335 	unsigned int skip_locking:1;
336 	unsigned int leave_spinning:1;
337 	unsigned int search_commit_root:1;
338 	unsigned int need_commit_sem:1;
339 	unsigned int skip_release_on_error:1;
340 };
341 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
342 					sizeof(struct btrfs_item))
343 struct btrfs_dev_replace {
344 	u64 replace_state;	/* see #define above */
345 	u64 time_started;	/* seconds since 1-Jan-1970 */
346 	u64 time_stopped;	/* seconds since 1-Jan-1970 */
347 	atomic64_t num_write_errors;
348 	atomic64_t num_uncorrectable_read_errors;
349 
350 	u64 cursor_left;
351 	u64 committed_cursor_left;
352 	u64 cursor_left_last_write_of_item;
353 	u64 cursor_right;
354 
355 	u64 cont_reading_from_srcdev_mode;	/* see #define above */
356 
357 	int is_valid;
358 	int item_needs_writeback;
359 	struct btrfs_device *srcdev;
360 	struct btrfs_device *tgtdev;
361 
362 	pid_t lock_owner;
363 	atomic_t nesting_level;
364 	struct mutex lock_finishing_cancel_unmount;
365 	rwlock_t lock;
366 	atomic_t read_locks;
367 	atomic_t blocking_readers;
368 	wait_queue_head_t read_lock_wq;
369 
370 	struct btrfs_scrub_progress scrub_progress;
371 };
372 
373 /* For raid type sysfs entries */
374 struct raid_kobject {
375 	int raid_type;
376 	struct kobject kobj;
377 };
378 
379 struct btrfs_space_info {
380 	spinlock_t lock;
381 
382 	u64 total_bytes;	/* total bytes in the space,
383 				   this doesn't take mirrors into account */
384 	u64 bytes_used;		/* total bytes used,
385 				   this doesn't take mirrors into account */
386 	u64 bytes_pinned;	/* total bytes pinned, will be freed when the
387 				   transaction finishes */
388 	u64 bytes_reserved;	/* total bytes the allocator has reserved for
389 				   current allocations */
390 	u64 bytes_may_use;	/* number of bytes that may be used for
391 				   delalloc/allocations */
392 	u64 bytes_readonly;	/* total bytes that are read only */
393 
394 	u64 max_extent_size;	/* This will hold the maximum extent size of
395 				   the space info if we had an ENOSPC in the
396 				   allocator. */
397 
398 	unsigned int full:1;	/* indicates that we cannot allocate any more
399 				   chunks for this space */
400 	unsigned int chunk_alloc:1;	/* set if we are allocating a chunk */
401 
402 	unsigned int flush:1;		/* set if we are trying to make space */
403 
404 	unsigned int force_alloc;	/* set if we need to force a chunk
405 					   alloc for this space */
406 
407 	u64 disk_used;		/* total bytes used on disk */
408 	u64 disk_total;		/* total bytes on disk, takes mirrors into
409 				   account */
410 
411 	u64 flags;
412 
413 	/*
414 	 * bytes_pinned is kept in line with what is actually pinned, as in
415 	 * we've called update_block_group and dropped the bytes_used counter
416 	 * and increased the bytes_pinned counter.  However this means that
417 	 * bytes_pinned does not reflect the bytes that will be pinned once the
418 	 * delayed refs are flushed, so this counter is inc'ed every time we
419 	 * call btrfs_free_extent so it is a realtime count of what will be
420 	 * freed once the transaction is committed.  It will be zeroed every
421 	 * time the transaction commits.
422 	 */
423 	struct percpu_counter total_bytes_pinned;
424 
425 	struct list_head list;
426 	/* Protected by the spinlock 'lock'. */
427 	struct list_head ro_bgs;
428 	struct list_head priority_tickets;
429 	struct list_head tickets;
430 
431 	struct rw_semaphore groups_sem;
432 	/* for block groups in our same type */
433 	struct list_head block_groups[BTRFS_NR_RAID_TYPES];
434 	wait_queue_head_t wait;
435 
436 	struct kobject kobj;
437 	struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
438 };
439 
440 #define	BTRFS_BLOCK_RSV_GLOBAL		1
441 #define	BTRFS_BLOCK_RSV_DELALLOC	2
442 #define	BTRFS_BLOCK_RSV_TRANS		3
443 #define	BTRFS_BLOCK_RSV_CHUNK		4
444 #define	BTRFS_BLOCK_RSV_DELOPS		5
445 #define	BTRFS_BLOCK_RSV_EMPTY		6
446 #define	BTRFS_BLOCK_RSV_TEMP		7
447 
448 struct btrfs_block_rsv {
449 	u64 size;
450 	u64 reserved;
451 	struct btrfs_space_info *space_info;
452 	spinlock_t lock;
453 	unsigned short full;
454 	unsigned short type;
455 	unsigned short failfast;
456 };
457 
458 /*
459  * free clusters are used to claim free space in relatively large chunks,
460  * allowing us to do less seeky writes.  They are used for all metadata
461  * allocations and data allocations in ssd mode.
462  */
463 struct btrfs_free_cluster {
464 	spinlock_t lock;
465 	spinlock_t refill_lock;
466 	struct rb_root root;
467 
468 	/* largest extent in this cluster */
469 	u64 max_size;
470 
471 	/* first extent starting offset */
472 	u64 window_start;
473 
474 	/* We did a full search and couldn't create a cluster */
475 	bool fragmented;
476 
477 	struct btrfs_block_group_cache *block_group;
478 	/*
479 	 * when a cluster is allocated from a block group, we put the
480 	 * cluster onto a list in the block group so that it can
481 	 * be freed before the block group is freed.
482 	 */
483 	struct list_head block_group_list;
484 };
485 
486 enum btrfs_caching_type {
487 	BTRFS_CACHE_NO		= 0,
488 	BTRFS_CACHE_STARTED	= 1,
489 	BTRFS_CACHE_FAST	= 2,
490 	BTRFS_CACHE_FINISHED	= 3,
491 	BTRFS_CACHE_ERROR	= 4,
492 };
493 
494 enum btrfs_disk_cache_state {
495 	BTRFS_DC_WRITTEN	= 0,
496 	BTRFS_DC_ERROR		= 1,
497 	BTRFS_DC_CLEAR		= 2,
498 	BTRFS_DC_SETUP		= 3,
499 };
500 
501 struct btrfs_caching_control {
502 	struct list_head list;
503 	struct mutex mutex;
504 	wait_queue_head_t wait;
505 	struct btrfs_work work;
506 	struct btrfs_block_group_cache *block_group;
507 	u64 progress;
508 	atomic_t count;
509 };
510 
511 /* Once caching_thread() finds this much free space, it will wake up waiters. */
512 #define CACHING_CTL_WAKE_UP (1024 * 1024 * 2)
513 
514 struct btrfs_io_ctl {
515 	void *cur, *orig;
516 	struct page *page;
517 	struct page **pages;
518 	struct btrfs_root *root;
519 	struct inode *inode;
520 	unsigned long size;
521 	int index;
522 	int num_pages;
523 	int entries;
524 	int bitmaps;
525 	unsigned check_crcs:1;
526 };
527 
528 struct btrfs_block_group_cache {
529 	struct btrfs_key key;
530 	struct btrfs_block_group_item item;
531 	struct btrfs_fs_info *fs_info;
532 	struct inode *inode;
533 	spinlock_t lock;
534 	u64 pinned;
535 	u64 reserved;
536 	u64 delalloc_bytes;
537 	u64 bytes_super;
538 	u64 flags;
539 	u64 cache_generation;
540 	u32 sectorsize;
541 
542 	/*
543 	 * If the free space extent count exceeds this number, convert the block
544 	 * group to bitmaps.
545 	 */
546 	u32 bitmap_high_thresh;
547 
548 	/*
549 	 * If the free space extent count drops below this number, convert the
550 	 * block group back to extents.
551 	 */
552 	u32 bitmap_low_thresh;
553 
554 	/*
555 	 * It is just used for the delayed data space allocation because
556 	 * only the data space allocation and the relative metadata update
557 	 * can be done cross the transaction.
558 	 */
559 	struct rw_semaphore data_rwsem;
560 
561 	/* for raid56, this is a full stripe, without parity */
562 	unsigned long full_stripe_len;
563 
564 	unsigned int ro;
565 	unsigned int iref:1;
566 	unsigned int has_caching_ctl:1;
567 	unsigned int removed:1;
568 
569 	int disk_cache_state;
570 
571 	/* cache tracking stuff */
572 	int cached;
573 	struct btrfs_caching_control *caching_ctl;
574 	u64 last_byte_to_unpin;
575 
576 	struct btrfs_space_info *space_info;
577 
578 	/* free space cache stuff */
579 	struct btrfs_free_space_ctl *free_space_ctl;
580 
581 	/* block group cache stuff */
582 	struct rb_node cache_node;
583 
584 	/* for block groups in the same raid type */
585 	struct list_head list;
586 
587 	/* usage count */
588 	atomic_t count;
589 
590 	/* List of struct btrfs_free_clusters for this block group.
591 	 * Today it will only have one thing on it, but that may change
592 	 */
593 	struct list_head cluster_list;
594 
595 	/* For delayed block group creation or deletion of empty block groups */
596 	struct list_head bg_list;
597 
598 	/* For read-only block groups */
599 	struct list_head ro_list;
600 
601 	atomic_t trimming;
602 
603 	/* For dirty block groups */
604 	struct list_head dirty_list;
605 	struct list_head io_list;
606 
607 	struct btrfs_io_ctl io_ctl;
608 
609 	/*
610 	 * Incremented when doing extent allocations and holding a read lock
611 	 * on the space_info's groups_sem semaphore.
612 	 * Decremented when an ordered extent that represents an IO against this
613 	 * block group's range is created (after it's added to its inode's
614 	 * root's list of ordered extents) or immediately after the allocation
615 	 * if it's a metadata extent or fallocate extent (for these cases we
616 	 * don't create ordered extents).
617 	 */
618 	atomic_t reservations;
619 
620 	/*
621 	 * Incremented while holding the spinlock *lock* by a task checking if
622 	 * it can perform a nocow write (incremented if the value for the *ro*
623 	 * field is 0). Decremented by such tasks once they create an ordered
624 	 * extent or before that if some error happens before reaching that step.
625 	 * This is to prevent races between block group relocation and nocow
626 	 * writes through direct IO.
627 	 */
628 	atomic_t nocow_writers;
629 
630 	/* Lock for free space tree operations. */
631 	struct mutex free_space_lock;
632 
633 	/*
634 	 * Does the block group need to be added to the free space tree?
635 	 * Protected by free_space_lock.
636 	 */
637 	int needs_free_space;
638 };
639 
640 /* delayed seq elem */
641 struct seq_list {
642 	struct list_head list;
643 	u64 seq;
644 };
645 
646 #define SEQ_LIST_INIT(name)	{ .list = LIST_HEAD_INIT((name).list), .seq = 0 }
647 
648 enum btrfs_orphan_cleanup_state {
649 	ORPHAN_CLEANUP_STARTED	= 1,
650 	ORPHAN_CLEANUP_DONE	= 2,
651 };
652 
653 /* used by the raid56 code to lock stripes for read/modify/write */
654 struct btrfs_stripe_hash {
655 	struct list_head hash_list;
656 	wait_queue_head_t wait;
657 	spinlock_t lock;
658 };
659 
660 /* used by the raid56 code to lock stripes for read/modify/write */
661 struct btrfs_stripe_hash_table {
662 	struct list_head stripe_cache;
663 	spinlock_t cache_lock;
664 	int cache_size;
665 	struct btrfs_stripe_hash table[];
666 };
667 
668 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
669 
670 void btrfs_init_async_reclaim_work(struct work_struct *work);
671 
672 /* fs_info */
673 struct reloc_control;
674 struct btrfs_device;
675 struct btrfs_fs_devices;
676 struct btrfs_balance_control;
677 struct btrfs_delayed_root;
678 struct btrfs_fs_info {
679 	u8 fsid[BTRFS_FSID_SIZE];
680 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
681 	struct btrfs_root *extent_root;
682 	struct btrfs_root *tree_root;
683 	struct btrfs_root *chunk_root;
684 	struct btrfs_root *dev_root;
685 	struct btrfs_root *fs_root;
686 	struct btrfs_root *csum_root;
687 	struct btrfs_root *quota_root;
688 	struct btrfs_root *uuid_root;
689 	struct btrfs_root *free_space_root;
690 
691 	/* the log root tree is a directory of all the other log roots */
692 	struct btrfs_root *log_root_tree;
693 
694 	spinlock_t fs_roots_radix_lock;
695 	struct radix_tree_root fs_roots_radix;
696 
697 	/* block group cache stuff */
698 	spinlock_t block_group_cache_lock;
699 	u64 first_logical_byte;
700 	struct rb_root block_group_cache_tree;
701 
702 	/* keep track of unallocated space */
703 	spinlock_t free_chunk_lock;
704 	u64 free_chunk_space;
705 
706 	struct extent_io_tree freed_extents[2];
707 	struct extent_io_tree *pinned_extents;
708 
709 	/* logical->physical extent mapping */
710 	struct btrfs_mapping_tree mapping_tree;
711 
712 	/*
713 	 * block reservation for extent, checksum, root tree and
714 	 * delayed dir index item
715 	 */
716 	struct btrfs_block_rsv global_block_rsv;
717 	/* block reservation for delay allocation */
718 	struct btrfs_block_rsv delalloc_block_rsv;
719 	/* block reservation for metadata operations */
720 	struct btrfs_block_rsv trans_block_rsv;
721 	/* block reservation for chunk tree */
722 	struct btrfs_block_rsv chunk_block_rsv;
723 	/* block reservation for delayed operations */
724 	struct btrfs_block_rsv delayed_block_rsv;
725 
726 	struct btrfs_block_rsv empty_block_rsv;
727 
728 	u64 generation;
729 	u64 last_trans_committed;
730 	u64 avg_delayed_ref_runtime;
731 
732 	/*
733 	 * this is updated to the current trans every time a full commit
734 	 * is required instead of the faster short fsync log commits
735 	 */
736 	u64 last_trans_log_full_commit;
737 	unsigned long mount_opt;
738 	/*
739 	 * Track requests for actions that need to be done during transaction
740 	 * commit (like for some mount options).
741 	 */
742 	unsigned long pending_changes;
743 	unsigned long compress_type:4;
744 	int commit_interval;
745 	/*
746 	 * It is a suggestive number, the read side is safe even it gets a
747 	 * wrong number because we will write out the data into a regular
748 	 * extent. The write side(mount/remount) is under ->s_umount lock,
749 	 * so it is also safe.
750 	 */
751 	u64 max_inline;
752 	/*
753 	 * Protected by ->chunk_mutex and sb->s_umount.
754 	 *
755 	 * The reason that we use two lock to protect it is because only
756 	 * remount and mount operations can change it and these two operations
757 	 * are under sb->s_umount, but the read side (chunk allocation) can not
758 	 * acquire sb->s_umount or the deadlock would happen. So we use two
759 	 * locks to protect it. On the write side, we must acquire two locks,
760 	 * and on the read side, we just need acquire one of them.
761 	 */
762 	u64 alloc_start;
763 	struct btrfs_transaction *running_transaction;
764 	wait_queue_head_t transaction_throttle;
765 	wait_queue_head_t transaction_wait;
766 	wait_queue_head_t transaction_blocked_wait;
767 	wait_queue_head_t async_submit_wait;
768 
769 	/*
770 	 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
771 	 * when they are updated.
772 	 *
773 	 * Because we do not clear the flags for ever, so we needn't use
774 	 * the lock on the read side.
775 	 *
776 	 * We also needn't use the lock when we mount the fs, because
777 	 * there is no other task which will update the flag.
778 	 */
779 	spinlock_t super_lock;
780 	struct btrfs_super_block *super_copy;
781 	struct btrfs_super_block *super_for_commit;
782 	struct block_device *__bdev;
783 	struct super_block *sb;
784 	struct inode *btree_inode;
785 	struct backing_dev_info bdi;
786 	struct mutex tree_log_mutex;
787 	struct mutex transaction_kthread_mutex;
788 	struct mutex cleaner_mutex;
789 	struct mutex chunk_mutex;
790 	struct mutex volume_mutex;
791 
792 	/*
793 	 * this is taken to make sure we don't set block groups ro after
794 	 * the free space cache has been allocated on them
795 	 */
796 	struct mutex ro_block_group_mutex;
797 
798 	/* this is used during read/modify/write to make sure
799 	 * no two ios are trying to mod the same stripe at the same
800 	 * time
801 	 */
802 	struct btrfs_stripe_hash_table *stripe_hash_table;
803 
804 	/*
805 	 * this protects the ordered operations list only while we are
806 	 * processing all of the entries on it.  This way we make
807 	 * sure the commit code doesn't find the list temporarily empty
808 	 * because another function happens to be doing non-waiting preflush
809 	 * before jumping into the main commit.
810 	 */
811 	struct mutex ordered_operations_mutex;
812 
813 	struct rw_semaphore commit_root_sem;
814 
815 	struct rw_semaphore cleanup_work_sem;
816 
817 	struct rw_semaphore subvol_sem;
818 	struct srcu_struct subvol_srcu;
819 
820 	spinlock_t trans_lock;
821 	/*
822 	 * the reloc mutex goes with the trans lock, it is taken
823 	 * during commit to protect us from the relocation code
824 	 */
825 	struct mutex reloc_mutex;
826 
827 	struct list_head trans_list;
828 	struct list_head dead_roots;
829 	struct list_head caching_block_groups;
830 
831 	spinlock_t delayed_iput_lock;
832 	struct list_head delayed_iputs;
833 	struct mutex cleaner_delayed_iput_mutex;
834 
835 	/* this protects tree_mod_seq_list */
836 	spinlock_t tree_mod_seq_lock;
837 	atomic64_t tree_mod_seq;
838 	struct list_head tree_mod_seq_list;
839 
840 	/* this protects tree_mod_log */
841 	rwlock_t tree_mod_log_lock;
842 	struct rb_root tree_mod_log;
843 
844 	atomic_t nr_async_submits;
845 	atomic_t async_submit_draining;
846 	atomic_t nr_async_bios;
847 	atomic_t async_delalloc_pages;
848 	atomic_t open_ioctl_trans;
849 
850 	/*
851 	 * this is used to protect the following list -- ordered_roots.
852 	 */
853 	spinlock_t ordered_root_lock;
854 
855 	/*
856 	 * all fs/file tree roots in which there are data=ordered extents
857 	 * pending writeback are added into this list.
858 	 *
859 	 * these can span multiple transactions and basically include
860 	 * every dirty data page that isn't from nodatacow
861 	 */
862 	struct list_head ordered_roots;
863 
864 	struct mutex delalloc_root_mutex;
865 	spinlock_t delalloc_root_lock;
866 	/* all fs/file tree roots that have delalloc inodes. */
867 	struct list_head delalloc_roots;
868 
869 	/*
870 	 * there is a pool of worker threads for checksumming during writes
871 	 * and a pool for checksumming after reads.  This is because readers
872 	 * can run with FS locks held, and the writers may be waiting for
873 	 * those locks.  We don't want ordering in the pending list to cause
874 	 * deadlocks, and so the two are serviced separately.
875 	 *
876 	 * A third pool does submit_bio to avoid deadlocking with the other
877 	 * two
878 	 */
879 	struct btrfs_workqueue *workers;
880 	struct btrfs_workqueue *delalloc_workers;
881 	struct btrfs_workqueue *flush_workers;
882 	struct btrfs_workqueue *endio_workers;
883 	struct btrfs_workqueue *endio_meta_workers;
884 	struct btrfs_workqueue *endio_raid56_workers;
885 	struct btrfs_workqueue *endio_repair_workers;
886 	struct btrfs_workqueue *rmw_workers;
887 	struct btrfs_workqueue *endio_meta_write_workers;
888 	struct btrfs_workqueue *endio_write_workers;
889 	struct btrfs_workqueue *endio_freespace_worker;
890 	struct btrfs_workqueue *submit_workers;
891 	struct btrfs_workqueue *caching_workers;
892 	struct btrfs_workqueue *readahead_workers;
893 
894 	/*
895 	 * fixup workers take dirty pages that didn't properly go through
896 	 * the cow mechanism and make them safe to write.  It happens
897 	 * for the sys_munmap function call path
898 	 */
899 	struct btrfs_workqueue *fixup_workers;
900 	struct btrfs_workqueue *delayed_workers;
901 
902 	/* the extent workers do delayed refs on the extent allocation tree */
903 	struct btrfs_workqueue *extent_workers;
904 	struct task_struct *transaction_kthread;
905 	struct task_struct *cleaner_kthread;
906 	int thread_pool_size;
907 
908 	struct kobject *space_info_kobj;
909 	int do_barriers;
910 	int closing;
911 	int log_root_recovering;
912 	int open;
913 
914 	u64 total_pinned;
915 
916 	/* used to keep from writing metadata until there is a nice batch */
917 	struct percpu_counter dirty_metadata_bytes;
918 	struct percpu_counter delalloc_bytes;
919 	s32 dirty_metadata_batch;
920 	s32 delalloc_batch;
921 
922 	struct list_head dirty_cowonly_roots;
923 
924 	struct btrfs_fs_devices *fs_devices;
925 
926 	/*
927 	 * the space_info list is almost entirely read only.  It only changes
928 	 * when we add a new raid type to the FS, and that happens
929 	 * very rarely.  RCU is used to protect it.
930 	 */
931 	struct list_head space_info;
932 
933 	struct btrfs_space_info *data_sinfo;
934 
935 	struct reloc_control *reloc_ctl;
936 
937 	/* data_alloc_cluster is only used in ssd mode */
938 	struct btrfs_free_cluster data_alloc_cluster;
939 
940 	/* all metadata allocations go through this cluster */
941 	struct btrfs_free_cluster meta_alloc_cluster;
942 
943 	/* auto defrag inodes go here */
944 	spinlock_t defrag_inodes_lock;
945 	struct rb_root defrag_inodes;
946 	atomic_t defrag_running;
947 
948 	/* Used to protect avail_{data, metadata, system}_alloc_bits */
949 	seqlock_t profiles_lock;
950 	/*
951 	 * these three are in extended format (availability of single
952 	 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
953 	 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
954 	 */
955 	u64 avail_data_alloc_bits;
956 	u64 avail_metadata_alloc_bits;
957 	u64 avail_system_alloc_bits;
958 
959 	/* restriper state */
960 	spinlock_t balance_lock;
961 	struct mutex balance_mutex;
962 	atomic_t balance_running;
963 	atomic_t balance_pause_req;
964 	atomic_t balance_cancel_req;
965 	struct btrfs_balance_control *balance_ctl;
966 	wait_queue_head_t balance_wait_q;
967 
968 	unsigned data_chunk_allocations;
969 	unsigned metadata_ratio;
970 
971 	void *bdev_holder;
972 
973 	/* private scrub information */
974 	struct mutex scrub_lock;
975 	atomic_t scrubs_running;
976 	atomic_t scrub_pause_req;
977 	atomic_t scrubs_paused;
978 	atomic_t scrub_cancel_req;
979 	wait_queue_head_t scrub_pause_wait;
980 	int scrub_workers_refcnt;
981 	struct btrfs_workqueue *scrub_workers;
982 	struct btrfs_workqueue *scrub_wr_completion_workers;
983 	struct btrfs_workqueue *scrub_nocow_workers;
984 	struct btrfs_workqueue *scrub_parity_workers;
985 
986 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
987 	u32 check_integrity_print_mask;
988 #endif
989 	/*
990 	 * quota information
991 	 */
992 	unsigned int quota_enabled:1;
993 
994 	/*
995 	 * quota_enabled only changes state after a commit. This holds the
996 	 * next state.
997 	 */
998 	unsigned int pending_quota_state:1;
999 
1000 	/* is qgroup tracking in a consistent state? */
1001 	u64 qgroup_flags;
1002 
1003 	/* holds configuration and tracking. Protected by qgroup_lock */
1004 	struct rb_root qgroup_tree;
1005 	struct rb_root qgroup_op_tree;
1006 	spinlock_t qgroup_lock;
1007 	spinlock_t qgroup_op_lock;
1008 	atomic_t qgroup_op_seq;
1009 
1010 	/*
1011 	 * used to avoid frequently calling ulist_alloc()/ulist_free()
1012 	 * when doing qgroup accounting, it must be protected by qgroup_lock.
1013 	 */
1014 	struct ulist *qgroup_ulist;
1015 
1016 	/* protect user change for quota operations */
1017 	struct mutex qgroup_ioctl_lock;
1018 
1019 	/* list of dirty qgroups to be written at next commit */
1020 	struct list_head dirty_qgroups;
1021 
1022 	/* used by qgroup for an efficient tree traversal */
1023 	u64 qgroup_seq;
1024 
1025 	/* qgroup rescan items */
1026 	struct mutex qgroup_rescan_lock; /* protects the progress item */
1027 	struct btrfs_key qgroup_rescan_progress;
1028 	struct btrfs_workqueue *qgroup_rescan_workers;
1029 	struct completion qgroup_rescan_completion;
1030 	struct btrfs_work qgroup_rescan_work;
1031 	bool qgroup_rescan_running;	/* protected by qgroup_rescan_lock */
1032 
1033 	/* filesystem state */
1034 	unsigned long fs_state;
1035 
1036 	struct btrfs_delayed_root *delayed_root;
1037 
1038 	/* readahead tree */
1039 	spinlock_t reada_lock;
1040 	struct radix_tree_root reada_tree;
1041 
1042 	/* readahead works cnt */
1043 	atomic_t reada_works_cnt;
1044 
1045 	/* Extent buffer radix tree */
1046 	spinlock_t buffer_lock;
1047 	struct radix_tree_root buffer_radix;
1048 
1049 	/* next backup root to be overwritten */
1050 	int backup_root_index;
1051 
1052 	int num_tolerated_disk_barrier_failures;
1053 
1054 	/* device replace state */
1055 	struct btrfs_dev_replace dev_replace;
1056 
1057 	atomic_t mutually_exclusive_operation_running;
1058 
1059 	struct percpu_counter bio_counter;
1060 	wait_queue_head_t replace_wait;
1061 
1062 	struct semaphore uuid_tree_rescan_sem;
1063 	unsigned int update_uuid_tree_gen:1;
1064 
1065 	/* Used to reclaim the metadata space in the background. */
1066 	struct work_struct async_reclaim_work;
1067 
1068 	spinlock_t unused_bgs_lock;
1069 	struct list_head unused_bgs;
1070 	struct mutex unused_bg_unpin_mutex;
1071 	struct mutex delete_unused_bgs_mutex;
1072 
1073 	/* For btrfs to record security options */
1074 	struct security_mnt_opts security_opts;
1075 
1076 	/*
1077 	 * Chunks that can't be freed yet (under a trim/discard operation)
1078 	 * and will be latter freed. Protected by fs_info->chunk_mutex.
1079 	 */
1080 	struct list_head pinned_chunks;
1081 
1082 	int creating_free_space_tree;
1083 	/* Used to record internally whether fs has been frozen */
1084 	int fs_frozen;
1085 };
1086 
1087 struct btrfs_subvolume_writers {
1088 	struct percpu_counter	counter;
1089 	wait_queue_head_t	wait;
1090 };
1091 
1092 /*
1093  * The state of btrfs root
1094  */
1095 /*
1096  * btrfs_record_root_in_trans is a multi-step process,
1097  * and it can race with the balancing code.   But the
1098  * race is very small, and only the first time the root
1099  * is added to each transaction.  So IN_TRANS_SETUP
1100  * is used to tell us when more checks are required
1101  */
1102 #define BTRFS_ROOT_IN_TRANS_SETUP	0
1103 #define BTRFS_ROOT_REF_COWS		1
1104 #define BTRFS_ROOT_TRACK_DIRTY		2
1105 #define BTRFS_ROOT_IN_RADIX		3
1106 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED	4
1107 #define BTRFS_ROOT_DEFRAG_RUNNING	5
1108 #define BTRFS_ROOT_FORCE_COW		6
1109 #define BTRFS_ROOT_MULTI_LOG_TASKS	7
1110 #define BTRFS_ROOT_DIRTY		8
1111 
1112 /*
1113  * in ram representation of the tree.  extent_root is used for all allocations
1114  * and for the extent tree extent_root root.
1115  */
1116 struct btrfs_root {
1117 	struct extent_buffer *node;
1118 
1119 	struct extent_buffer *commit_root;
1120 	struct btrfs_root *log_root;
1121 	struct btrfs_root *reloc_root;
1122 
1123 	unsigned long state;
1124 	struct btrfs_root_item root_item;
1125 	struct btrfs_key root_key;
1126 	struct btrfs_fs_info *fs_info;
1127 	struct extent_io_tree dirty_log_pages;
1128 
1129 	struct mutex objectid_mutex;
1130 
1131 	spinlock_t accounting_lock;
1132 	struct btrfs_block_rsv *block_rsv;
1133 
1134 	/* free ino cache stuff */
1135 	struct btrfs_free_space_ctl *free_ino_ctl;
1136 	enum btrfs_caching_type ino_cache_state;
1137 	spinlock_t ino_cache_lock;
1138 	wait_queue_head_t ino_cache_wait;
1139 	struct btrfs_free_space_ctl *free_ino_pinned;
1140 	u64 ino_cache_progress;
1141 	struct inode *ino_cache_inode;
1142 
1143 	struct mutex log_mutex;
1144 	wait_queue_head_t log_writer_wait;
1145 	wait_queue_head_t log_commit_wait[2];
1146 	struct list_head log_ctxs[2];
1147 	atomic_t log_writers;
1148 	atomic_t log_commit[2];
1149 	atomic_t log_batch;
1150 	int log_transid;
1151 	/* No matter the commit succeeds or not*/
1152 	int log_transid_committed;
1153 	/* Just be updated when the commit succeeds. */
1154 	int last_log_commit;
1155 	pid_t log_start_pid;
1156 
1157 	u64 objectid;
1158 	u64 last_trans;
1159 
1160 	/* data allocations are done in sectorsize units */
1161 	u32 sectorsize;
1162 
1163 	/* node allocations are done in nodesize units */
1164 	u32 nodesize;
1165 
1166 	u32 stripesize;
1167 
1168 	u32 type;
1169 
1170 	u64 highest_objectid;
1171 
1172 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1173 	/* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1174 	u64 alloc_bytenr;
1175 #endif
1176 
1177 	u64 defrag_trans_start;
1178 	struct btrfs_key defrag_progress;
1179 	struct btrfs_key defrag_max;
1180 	char *name;
1181 
1182 	/* the dirty list is only used by non-reference counted roots */
1183 	struct list_head dirty_list;
1184 
1185 	struct list_head root_list;
1186 
1187 	spinlock_t log_extents_lock[2];
1188 	struct list_head logged_list[2];
1189 
1190 	spinlock_t orphan_lock;
1191 	atomic_t orphan_inodes;
1192 	struct btrfs_block_rsv *orphan_block_rsv;
1193 	int orphan_cleanup_state;
1194 
1195 	spinlock_t inode_lock;
1196 	/* red-black tree that keeps track of in-memory inodes */
1197 	struct rb_root inode_tree;
1198 
1199 	/*
1200 	 * radix tree that keeps track of delayed nodes of every inode,
1201 	 * protected by inode_lock
1202 	 */
1203 	struct radix_tree_root delayed_nodes_tree;
1204 	/*
1205 	 * right now this just gets used so that a root has its own devid
1206 	 * for stat.  It may be used for more later
1207 	 */
1208 	dev_t anon_dev;
1209 
1210 	spinlock_t root_item_lock;
1211 	atomic_t refs;
1212 
1213 	struct mutex delalloc_mutex;
1214 	spinlock_t delalloc_lock;
1215 	/*
1216 	 * all of the inodes that have delalloc bytes.  It is possible for
1217 	 * this list to be empty even when there is still dirty data=ordered
1218 	 * extents waiting to finish IO.
1219 	 */
1220 	struct list_head delalloc_inodes;
1221 	struct list_head delalloc_root;
1222 	u64 nr_delalloc_inodes;
1223 
1224 	struct mutex ordered_extent_mutex;
1225 	/*
1226 	 * this is used by the balancing code to wait for all the pending
1227 	 * ordered extents
1228 	 */
1229 	spinlock_t ordered_extent_lock;
1230 
1231 	/*
1232 	 * all of the data=ordered extents pending writeback
1233 	 * these can span multiple transactions and basically include
1234 	 * every dirty data page that isn't from nodatacow
1235 	 */
1236 	struct list_head ordered_extents;
1237 	struct list_head ordered_root;
1238 	u64 nr_ordered_extents;
1239 
1240 	/*
1241 	 * Number of currently running SEND ioctls to prevent
1242 	 * manipulation with the read-only status via SUBVOL_SETFLAGS
1243 	 */
1244 	int send_in_progress;
1245 	struct btrfs_subvolume_writers *subv_writers;
1246 	atomic_t will_be_snapshoted;
1247 
1248 	/* For qgroup metadata space reserve */
1249 	atomic_t qgroup_meta_rsv;
1250 };
1251 
1252 static inline u32 __BTRFS_LEAF_DATA_SIZE(u32 blocksize)
1253 {
1254 	return blocksize - sizeof(struct btrfs_header);
1255 }
1256 
1257 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_root *root)
1258 {
1259 	return __BTRFS_LEAF_DATA_SIZE(root->nodesize);
1260 }
1261 
1262 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_root *root)
1263 {
1264 	return BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item);
1265 }
1266 
1267 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_root *root)
1268 {
1269 	return BTRFS_LEAF_DATA_SIZE(root) / sizeof(struct btrfs_key_ptr);
1270 }
1271 
1272 #define BTRFS_FILE_EXTENT_INLINE_DATA_START		\
1273 		(offsetof(struct btrfs_file_extent_item, disk_bytenr))
1274 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_root *root)
1275 {
1276 	return BTRFS_MAX_ITEM_SIZE(root) -
1277 	       BTRFS_FILE_EXTENT_INLINE_DATA_START;
1278 }
1279 
1280 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_root *root)
1281 {
1282 	return BTRFS_MAX_ITEM_SIZE(root) - sizeof(struct btrfs_dir_item);
1283 }
1284 
1285 /*
1286  * Flags for mount options.
1287  *
1288  * Note: don't forget to add new options to btrfs_show_options()
1289  */
1290 #define BTRFS_MOUNT_NODATASUM		(1 << 0)
1291 #define BTRFS_MOUNT_NODATACOW		(1 << 1)
1292 #define BTRFS_MOUNT_NOBARRIER		(1 << 2)
1293 #define BTRFS_MOUNT_SSD			(1 << 3)
1294 #define BTRFS_MOUNT_DEGRADED		(1 << 4)
1295 #define BTRFS_MOUNT_COMPRESS		(1 << 5)
1296 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1297 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1298 #define BTRFS_MOUNT_SSD_SPREAD		(1 << 8)
1299 #define BTRFS_MOUNT_NOSSD		(1 << 9)
1300 #define BTRFS_MOUNT_DISCARD		(1 << 10)
1301 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1302 #define BTRFS_MOUNT_SPACE_CACHE		(1 << 12)
1303 #define BTRFS_MOUNT_CLEAR_CACHE		(1 << 13)
1304 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1305 #define BTRFS_MOUNT_ENOSPC_DEBUG	 (1 << 15)
1306 #define BTRFS_MOUNT_AUTO_DEFRAG		(1 << 16)
1307 #define BTRFS_MOUNT_INODE_MAP_CACHE	(1 << 17)
1308 #define BTRFS_MOUNT_USEBACKUPROOT	(1 << 18)
1309 #define BTRFS_MOUNT_SKIP_BALANCE	(1 << 19)
1310 #define BTRFS_MOUNT_CHECK_INTEGRITY	(1 << 20)
1311 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1312 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	(1 << 22)
1313 #define BTRFS_MOUNT_RESCAN_UUID_TREE	(1 << 23)
1314 #define BTRFS_MOUNT_FRAGMENT_DATA	(1 << 24)
1315 #define BTRFS_MOUNT_FRAGMENT_METADATA	(1 << 25)
1316 #define BTRFS_MOUNT_FREE_SPACE_TREE	(1 << 26)
1317 #define BTRFS_MOUNT_NOLOGREPLAY		(1 << 27)
1318 
1319 #define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)
1320 #define BTRFS_DEFAULT_MAX_INLINE	(2048)
1321 
1322 #define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
1323 #define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
1324 #define btrfs_raw_test_opt(o, opt)	((o) & BTRFS_MOUNT_##opt)
1325 #define btrfs_test_opt(fs_info, opt)	((fs_info)->mount_opt & \
1326 					 BTRFS_MOUNT_##opt)
1327 
1328 #define btrfs_set_and_info(fs_info, opt, fmt, args...)			\
1329 {									\
1330 	if (!btrfs_test_opt(fs_info, opt))				\
1331 		btrfs_info(fs_info, fmt, ##args);			\
1332 	btrfs_set_opt(fs_info->mount_opt, opt);				\
1333 }
1334 
1335 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)		\
1336 {									\
1337 	if (btrfs_test_opt(fs_info, opt))				\
1338 		btrfs_info(fs_info, fmt, ##args);			\
1339 	btrfs_clear_opt(fs_info->mount_opt, opt);			\
1340 }
1341 
1342 #ifdef CONFIG_BTRFS_DEBUG
1343 static inline int
1344 btrfs_should_fragment_free_space(struct btrfs_root *root,
1345 				 struct btrfs_block_group_cache *block_group)
1346 {
1347 	return (btrfs_test_opt(root->fs_info, FRAGMENT_METADATA) &&
1348 		block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1349 	       (btrfs_test_opt(root->fs_info, FRAGMENT_DATA) &&
1350 		block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1351 }
1352 #endif
1353 
1354 /*
1355  * Requests for changes that need to be done during transaction commit.
1356  *
1357  * Internal mount options that are used for special handling of the real
1358  * mount options (eg. cannot be set during remount and have to be set during
1359  * transaction commit)
1360  */
1361 
1362 #define BTRFS_PENDING_SET_INODE_MAP_CACHE	(0)
1363 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE	(1)
1364 #define BTRFS_PENDING_COMMIT			(2)
1365 
1366 #define btrfs_test_pending(info, opt)	\
1367 	test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1368 #define btrfs_set_pending(info, opt)	\
1369 	set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1370 #define btrfs_clear_pending(info, opt)	\
1371 	clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1372 
1373 /*
1374  * Helpers for setting pending mount option changes.
1375  *
1376  * Expects corresponding macros
1377  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1378  */
1379 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1380 do {                                                                   \
1381        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1382                btrfs_info((info), fmt, ##args);                        \
1383                btrfs_set_pending((info), SET_##opt);                   \
1384                btrfs_clear_pending((info), CLEAR_##opt);               \
1385        }                                                               \
1386 } while(0)
1387 
1388 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1389 do {                                                                   \
1390        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1391                btrfs_info((info), fmt, ##args);                        \
1392                btrfs_set_pending((info), CLEAR_##opt);                 \
1393                btrfs_clear_pending((info), SET_##opt);                 \
1394        }                                                               \
1395 } while(0)
1396 
1397 /*
1398  * Inode flags
1399  */
1400 #define BTRFS_INODE_NODATASUM		(1 << 0)
1401 #define BTRFS_INODE_NODATACOW		(1 << 1)
1402 #define BTRFS_INODE_READONLY		(1 << 2)
1403 #define BTRFS_INODE_NOCOMPRESS		(1 << 3)
1404 #define BTRFS_INODE_PREALLOC		(1 << 4)
1405 #define BTRFS_INODE_SYNC		(1 << 5)
1406 #define BTRFS_INODE_IMMUTABLE		(1 << 6)
1407 #define BTRFS_INODE_APPEND		(1 << 7)
1408 #define BTRFS_INODE_NODUMP		(1 << 8)
1409 #define BTRFS_INODE_NOATIME		(1 << 9)
1410 #define BTRFS_INODE_DIRSYNC		(1 << 10)
1411 #define BTRFS_INODE_COMPRESS		(1 << 11)
1412 
1413 #define BTRFS_INODE_ROOT_ITEM_INIT	(1 << 31)
1414 
1415 struct btrfs_map_token {
1416 	struct extent_buffer *eb;
1417 	char *kaddr;
1418 	unsigned long offset;
1419 };
1420 
1421 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1422 				((bytes) >> (fs_info)->sb->s_blocksize_bits)
1423 
1424 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1425 {
1426 	token->kaddr = NULL;
1427 }
1428 
1429 /* some macros to generate set/get functions for the struct fields.  This
1430  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1431  * one for u8:
1432  */
1433 #define le8_to_cpu(v) (v)
1434 #define cpu_to_le8(v) (v)
1435 #define __le8 u8
1436 
1437 #define read_eb_member(eb, ptr, type, member, result) (			\
1438 	read_extent_buffer(eb, (char *)(result),			\
1439 			   ((unsigned long)(ptr)) +			\
1440 			    offsetof(type, member),			\
1441 			   sizeof(((type *)0)->member)))
1442 
1443 #define write_eb_member(eb, ptr, type, member, result) (		\
1444 	write_extent_buffer(eb, (char *)(result),			\
1445 			   ((unsigned long)(ptr)) +			\
1446 			    offsetof(type, member),			\
1447 			   sizeof(((type *)0)->member)))
1448 
1449 #define DECLARE_BTRFS_SETGET_BITS(bits)					\
1450 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,	\
1451 			       unsigned long off,			\
1452                               struct btrfs_map_token *token);		\
1453 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr,	\
1454 			    unsigned long off, u##bits val,		\
1455 			    struct btrfs_map_token *token);		\
1456 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
1457 				       unsigned long off)		\
1458 {									\
1459 	return btrfs_get_token_##bits(eb, ptr, off, NULL);		\
1460 }									\
1461 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
1462 				    unsigned long off, u##bits val)	\
1463 {									\
1464        btrfs_set_token_##bits(eb, ptr, off, val, NULL);			\
1465 }
1466 
1467 DECLARE_BTRFS_SETGET_BITS(8)
1468 DECLARE_BTRFS_SETGET_BITS(16)
1469 DECLARE_BTRFS_SETGET_BITS(32)
1470 DECLARE_BTRFS_SETGET_BITS(64)
1471 
1472 #define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
1473 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s)	\
1474 {									\
1475 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1476 	return btrfs_get_##bits(eb, s, offsetof(type, member));		\
1477 }									\
1478 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,	\
1479 				    u##bits val)			\
1480 {									\
1481 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1482 	btrfs_set_##bits(eb, s, offsetof(type, member), val);		\
1483 }									\
1484 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
1485 					 struct btrfs_map_token *token)	\
1486 {									\
1487 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1488 	return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1489 }									\
1490 static inline void btrfs_set_token_##name(struct extent_buffer *eb,	\
1491 					  type *s, u##bits val,		\
1492                                          struct btrfs_map_token *token)	\
1493 {									\
1494 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1495 	btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1496 }
1497 
1498 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
1499 static inline u##bits btrfs_##name(struct extent_buffer *eb)		\
1500 {									\
1501 	type *p = page_address(eb->pages[0]);				\
1502 	u##bits res = le##bits##_to_cpu(p->member);			\
1503 	return res;							\
1504 }									\
1505 static inline void btrfs_set_##name(struct extent_buffer *eb,		\
1506 				    u##bits val)			\
1507 {									\
1508 	type *p = page_address(eb->pages[0]);				\
1509 	p->member = cpu_to_le##bits(val);				\
1510 }
1511 
1512 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
1513 static inline u##bits btrfs_##name(type *s)				\
1514 {									\
1515 	return le##bits##_to_cpu(s->member);				\
1516 }									\
1517 static inline void btrfs_set_##name(type *s, u##bits val)		\
1518 {									\
1519 	s->member = cpu_to_le##bits(val);				\
1520 }
1521 
1522 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1523 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1524 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1525 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1526 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1527 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1528 		   start_offset, 64);
1529 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1530 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1531 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1532 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1533 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1534 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1535 
1536 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1537 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1538 			 total_bytes, 64);
1539 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1540 			 bytes_used, 64);
1541 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1542 			 io_align, 32);
1543 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1544 			 io_width, 32);
1545 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1546 			 sector_size, 32);
1547 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1548 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1549 			 dev_group, 32);
1550 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1551 			 seek_speed, 8);
1552 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1553 			 bandwidth, 8);
1554 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1555 			 generation, 64);
1556 
1557 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1558 {
1559 	return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1560 }
1561 
1562 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1563 {
1564 	return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1565 }
1566 
1567 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1568 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1569 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1570 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1571 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1572 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1573 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1574 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1575 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1576 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1577 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1578 
1579 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1580 {
1581 	return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1582 }
1583 
1584 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1585 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1586 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1587 			 stripe_len, 64);
1588 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1589 			 io_align, 32);
1590 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1591 			 io_width, 32);
1592 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1593 			 sector_size, 32);
1594 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1595 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1596 			 num_stripes, 16);
1597 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1598 			 sub_stripes, 16);
1599 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1600 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1601 
1602 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1603 						   int nr)
1604 {
1605 	unsigned long offset = (unsigned long)c;
1606 	offset += offsetof(struct btrfs_chunk, stripe);
1607 	offset += nr * sizeof(struct btrfs_stripe);
1608 	return (struct btrfs_stripe *)offset;
1609 }
1610 
1611 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1612 {
1613 	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1614 }
1615 
1616 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1617 					 struct btrfs_chunk *c, int nr)
1618 {
1619 	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1620 }
1621 
1622 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1623 					 struct btrfs_chunk *c, int nr)
1624 {
1625 	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1626 }
1627 
1628 /* struct btrfs_block_group_item */
1629 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1630 			 used, 64);
1631 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1632 			 used, 64);
1633 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1634 			struct btrfs_block_group_item, chunk_objectid, 64);
1635 
1636 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1637 		   struct btrfs_block_group_item, chunk_objectid, 64);
1638 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1639 		   struct btrfs_block_group_item, flags, 64);
1640 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1641 			struct btrfs_block_group_item, flags, 64);
1642 
1643 /* struct btrfs_free_space_info */
1644 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1645 		   extent_count, 32);
1646 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1647 
1648 /* struct btrfs_inode_ref */
1649 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1650 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1651 
1652 /* struct btrfs_inode_extref */
1653 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1654 		   parent_objectid, 64);
1655 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1656 		   name_len, 16);
1657 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1658 
1659 /* struct btrfs_inode_item */
1660 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1661 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1662 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1663 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1664 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1665 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1666 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1667 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1668 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1669 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1670 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1671 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1672 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1673 			 generation, 64);
1674 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1675 			 sequence, 64);
1676 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1677 			 transid, 64);
1678 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1679 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1680 			 nbytes, 64);
1681 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1682 			 block_group, 64);
1683 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1684 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1685 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1686 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1687 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1688 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1689 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1690 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1691 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1692 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1693 
1694 /* struct btrfs_dev_extent */
1695 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1696 		   chunk_tree, 64);
1697 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1698 		   chunk_objectid, 64);
1699 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1700 		   chunk_offset, 64);
1701 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1702 
1703 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1704 {
1705 	unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1706 	return (unsigned long)dev + ptr;
1707 }
1708 
1709 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1710 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1711 		   generation, 64);
1712 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1713 
1714 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1715 
1716 
1717 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1718 
1719 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1720 					struct btrfs_tree_block_info *item,
1721 					struct btrfs_disk_key *key)
1722 {
1723 	read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1724 }
1725 
1726 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1727 					    struct btrfs_tree_block_info *item,
1728 					    struct btrfs_disk_key *key)
1729 {
1730 	write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1731 }
1732 
1733 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1734 		   root, 64);
1735 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1736 		   objectid, 64);
1737 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1738 		   offset, 64);
1739 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1740 		   count, 32);
1741 
1742 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1743 		   count, 32);
1744 
1745 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1746 		   type, 8);
1747 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1748 		   offset, 64);
1749 
1750 static inline u32 btrfs_extent_inline_ref_size(int type)
1751 {
1752 	if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1753 	    type == BTRFS_SHARED_BLOCK_REF_KEY)
1754 		return sizeof(struct btrfs_extent_inline_ref);
1755 	if (type == BTRFS_SHARED_DATA_REF_KEY)
1756 		return sizeof(struct btrfs_shared_data_ref) +
1757 		       sizeof(struct btrfs_extent_inline_ref);
1758 	if (type == BTRFS_EXTENT_DATA_REF_KEY)
1759 		return sizeof(struct btrfs_extent_data_ref) +
1760 		       offsetof(struct btrfs_extent_inline_ref, offset);
1761 	BUG();
1762 	return 0;
1763 }
1764 
1765 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1766 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1767 		   generation, 64);
1768 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1769 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1770 
1771 /* struct btrfs_node */
1772 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1773 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1774 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1775 			 blockptr, 64);
1776 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1777 			 generation, 64);
1778 
1779 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1780 {
1781 	unsigned long ptr;
1782 	ptr = offsetof(struct btrfs_node, ptrs) +
1783 		sizeof(struct btrfs_key_ptr) * nr;
1784 	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1785 }
1786 
1787 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1788 					   int nr, u64 val)
1789 {
1790 	unsigned long ptr;
1791 	ptr = offsetof(struct btrfs_node, ptrs) +
1792 		sizeof(struct btrfs_key_ptr) * nr;
1793 	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1794 }
1795 
1796 static inline u64 btrfs_node_ptr_generation(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_generation(eb, (struct btrfs_key_ptr *)ptr);
1802 }
1803 
1804 static inline void btrfs_set_node_ptr_generation(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_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1811 }
1812 
1813 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1814 {
1815 	return offsetof(struct btrfs_node, ptrs) +
1816 		sizeof(struct btrfs_key_ptr) * nr;
1817 }
1818 
1819 void btrfs_node_key(struct extent_buffer *eb,
1820 		    struct btrfs_disk_key *disk_key, int nr);
1821 
1822 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1823 				      struct btrfs_disk_key *disk_key, int nr)
1824 {
1825 	unsigned long ptr;
1826 	ptr = btrfs_node_key_ptr_offset(nr);
1827 	write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1828 		       struct btrfs_key_ptr, key, disk_key);
1829 }
1830 
1831 /* struct btrfs_item */
1832 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1833 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1834 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1835 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1836 
1837 static inline unsigned long btrfs_item_nr_offset(int nr)
1838 {
1839 	return offsetof(struct btrfs_leaf, items) +
1840 		sizeof(struct btrfs_item) * nr;
1841 }
1842 
1843 static inline struct btrfs_item *btrfs_item_nr(int nr)
1844 {
1845 	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1846 }
1847 
1848 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1849 				 struct btrfs_item *item)
1850 {
1851 	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1852 }
1853 
1854 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1855 {
1856 	return btrfs_item_end(eb, btrfs_item_nr(nr));
1857 }
1858 
1859 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1860 {
1861 	return btrfs_item_offset(eb, btrfs_item_nr(nr));
1862 }
1863 
1864 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1865 {
1866 	return btrfs_item_size(eb, btrfs_item_nr(nr));
1867 }
1868 
1869 static inline void btrfs_item_key(struct extent_buffer *eb,
1870 			   struct btrfs_disk_key *disk_key, int nr)
1871 {
1872 	struct btrfs_item *item = btrfs_item_nr(nr);
1873 	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1874 }
1875 
1876 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1877 			       struct btrfs_disk_key *disk_key, int nr)
1878 {
1879 	struct btrfs_item *item = btrfs_item_nr(nr);
1880 	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1881 }
1882 
1883 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1884 
1885 /*
1886  * struct btrfs_root_ref
1887  */
1888 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1889 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1890 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1891 
1892 /* struct btrfs_dir_item */
1893 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1894 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1895 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1896 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1897 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1898 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1899 			 data_len, 16);
1900 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1901 			 name_len, 16);
1902 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1903 			 transid, 64);
1904 
1905 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1906 				      struct btrfs_dir_item *item,
1907 				      struct btrfs_disk_key *key)
1908 {
1909 	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1910 }
1911 
1912 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1913 					  struct btrfs_dir_item *item,
1914 					  struct btrfs_disk_key *key)
1915 {
1916 	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1917 }
1918 
1919 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1920 		   num_entries, 64);
1921 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1922 		   num_bitmaps, 64);
1923 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1924 		   generation, 64);
1925 
1926 static inline void btrfs_free_space_key(struct extent_buffer *eb,
1927 					struct btrfs_free_space_header *h,
1928 					struct btrfs_disk_key *key)
1929 {
1930 	read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1931 }
1932 
1933 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1934 					    struct btrfs_free_space_header *h,
1935 					    struct btrfs_disk_key *key)
1936 {
1937 	write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1938 }
1939 
1940 /* struct btrfs_disk_key */
1941 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1942 			 objectid, 64);
1943 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1944 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1945 
1946 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1947 					 struct btrfs_disk_key *disk)
1948 {
1949 	cpu->offset = le64_to_cpu(disk->offset);
1950 	cpu->type = disk->type;
1951 	cpu->objectid = le64_to_cpu(disk->objectid);
1952 }
1953 
1954 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1955 					 struct btrfs_key *cpu)
1956 {
1957 	disk->offset = cpu_to_le64(cpu->offset);
1958 	disk->type = cpu->type;
1959 	disk->objectid = cpu_to_le64(cpu->objectid);
1960 }
1961 
1962 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1963 				  struct btrfs_key *key, int nr)
1964 {
1965 	struct btrfs_disk_key disk_key;
1966 	btrfs_node_key(eb, &disk_key, nr);
1967 	btrfs_disk_key_to_cpu(key, &disk_key);
1968 }
1969 
1970 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1971 				  struct btrfs_key *key, int nr)
1972 {
1973 	struct btrfs_disk_key disk_key;
1974 	btrfs_item_key(eb, &disk_key, nr);
1975 	btrfs_disk_key_to_cpu(key, &disk_key);
1976 }
1977 
1978 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1979 				      struct btrfs_dir_item *item,
1980 				      struct btrfs_key *key)
1981 {
1982 	struct btrfs_disk_key disk_key;
1983 	btrfs_dir_item_key(eb, item, &disk_key);
1984 	btrfs_disk_key_to_cpu(key, &disk_key);
1985 }
1986 
1987 
1988 static inline u8 btrfs_key_type(struct btrfs_key *key)
1989 {
1990 	return key->type;
1991 }
1992 
1993 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1994 {
1995 	key->type = val;
1996 }
1997 
1998 /* struct btrfs_header */
1999 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2000 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2001 			  generation, 64);
2002 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2003 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2004 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2005 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2006 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2007 			 generation, 64);
2008 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2009 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2010 			 nritems, 32);
2011 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2012 
2013 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2014 {
2015 	return (btrfs_header_flags(eb) & flag) == flag;
2016 }
2017 
2018 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2019 {
2020 	u64 flags = btrfs_header_flags(eb);
2021 	btrfs_set_header_flags(eb, flags | flag);
2022 	return (flags & flag) == flag;
2023 }
2024 
2025 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2026 {
2027 	u64 flags = btrfs_header_flags(eb);
2028 	btrfs_set_header_flags(eb, flags & ~flag);
2029 	return (flags & flag) == flag;
2030 }
2031 
2032 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2033 {
2034 	u64 flags = btrfs_header_flags(eb);
2035 	return flags >> BTRFS_BACKREF_REV_SHIFT;
2036 }
2037 
2038 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2039 						int rev)
2040 {
2041 	u64 flags = btrfs_header_flags(eb);
2042 	flags &= ~BTRFS_BACKREF_REV_MASK;
2043 	flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2044 	btrfs_set_header_flags(eb, flags);
2045 }
2046 
2047 static inline unsigned long btrfs_header_fsid(void)
2048 {
2049 	return offsetof(struct btrfs_header, fsid);
2050 }
2051 
2052 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2053 {
2054 	return offsetof(struct btrfs_header, chunk_tree_uuid);
2055 }
2056 
2057 static inline int btrfs_is_leaf(struct extent_buffer *eb)
2058 {
2059 	return btrfs_header_level(eb) == 0;
2060 }
2061 
2062 /* struct btrfs_root_item */
2063 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2064 		   generation, 64);
2065 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2066 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2067 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2068 
2069 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2070 			 generation, 64);
2071 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2072 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2073 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2074 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2075 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2076 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2077 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2078 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2079 			 last_snapshot, 64);
2080 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2081 			 generation_v2, 64);
2082 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2083 			 ctransid, 64);
2084 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2085 			 otransid, 64);
2086 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2087 			 stransid, 64);
2088 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2089 			 rtransid, 64);
2090 
2091 static inline bool btrfs_root_readonly(struct btrfs_root *root)
2092 {
2093 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2094 }
2095 
2096 static inline bool btrfs_root_dead(struct btrfs_root *root)
2097 {
2098 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2099 }
2100 
2101 /* struct btrfs_root_backup */
2102 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2103 		   tree_root, 64);
2104 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2105 		   tree_root_gen, 64);
2106 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2107 		   tree_root_level, 8);
2108 
2109 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2110 		   chunk_root, 64);
2111 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2112 		   chunk_root_gen, 64);
2113 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2114 		   chunk_root_level, 8);
2115 
2116 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2117 		   extent_root, 64);
2118 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2119 		   extent_root_gen, 64);
2120 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2121 		   extent_root_level, 8);
2122 
2123 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2124 		   fs_root, 64);
2125 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2126 		   fs_root_gen, 64);
2127 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2128 		   fs_root_level, 8);
2129 
2130 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2131 		   dev_root, 64);
2132 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2133 		   dev_root_gen, 64);
2134 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2135 		   dev_root_level, 8);
2136 
2137 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2138 		   csum_root, 64);
2139 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2140 		   csum_root_gen, 64);
2141 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2142 		   csum_root_level, 8);
2143 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2144 		   total_bytes, 64);
2145 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2146 		   bytes_used, 64);
2147 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2148 		   num_devices, 64);
2149 
2150 /* struct btrfs_balance_item */
2151 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2152 
2153 static inline void btrfs_balance_data(struct extent_buffer *eb,
2154 				      struct btrfs_balance_item *bi,
2155 				      struct btrfs_disk_balance_args *ba)
2156 {
2157 	read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2158 }
2159 
2160 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2161 					  struct btrfs_balance_item *bi,
2162 					  struct btrfs_disk_balance_args *ba)
2163 {
2164 	write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2165 }
2166 
2167 static inline void btrfs_balance_meta(struct extent_buffer *eb,
2168 				      struct btrfs_balance_item *bi,
2169 				      struct btrfs_disk_balance_args *ba)
2170 {
2171 	read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2172 }
2173 
2174 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2175 					  struct btrfs_balance_item *bi,
2176 					  struct btrfs_disk_balance_args *ba)
2177 {
2178 	write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2179 }
2180 
2181 static inline void btrfs_balance_sys(struct extent_buffer *eb,
2182 				     struct btrfs_balance_item *bi,
2183 				     struct btrfs_disk_balance_args *ba)
2184 {
2185 	read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2186 }
2187 
2188 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2189 					 struct btrfs_balance_item *bi,
2190 					 struct btrfs_disk_balance_args *ba)
2191 {
2192 	write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2193 }
2194 
2195 static inline void
2196 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2197 			       struct btrfs_disk_balance_args *disk)
2198 {
2199 	memset(cpu, 0, sizeof(*cpu));
2200 
2201 	cpu->profiles = le64_to_cpu(disk->profiles);
2202 	cpu->usage = le64_to_cpu(disk->usage);
2203 	cpu->devid = le64_to_cpu(disk->devid);
2204 	cpu->pstart = le64_to_cpu(disk->pstart);
2205 	cpu->pend = le64_to_cpu(disk->pend);
2206 	cpu->vstart = le64_to_cpu(disk->vstart);
2207 	cpu->vend = le64_to_cpu(disk->vend);
2208 	cpu->target = le64_to_cpu(disk->target);
2209 	cpu->flags = le64_to_cpu(disk->flags);
2210 	cpu->limit = le64_to_cpu(disk->limit);
2211 }
2212 
2213 static inline void
2214 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2215 			       struct btrfs_balance_args *cpu)
2216 {
2217 	memset(disk, 0, sizeof(*disk));
2218 
2219 	disk->profiles = cpu_to_le64(cpu->profiles);
2220 	disk->usage = cpu_to_le64(cpu->usage);
2221 	disk->devid = cpu_to_le64(cpu->devid);
2222 	disk->pstart = cpu_to_le64(cpu->pstart);
2223 	disk->pend = cpu_to_le64(cpu->pend);
2224 	disk->vstart = cpu_to_le64(cpu->vstart);
2225 	disk->vend = cpu_to_le64(cpu->vend);
2226 	disk->target = cpu_to_le64(cpu->target);
2227 	disk->flags = cpu_to_le64(cpu->flags);
2228 	disk->limit = cpu_to_le64(cpu->limit);
2229 }
2230 
2231 /* struct btrfs_super_block */
2232 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2233 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2234 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2235 			 generation, 64);
2236 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2237 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2238 			 struct btrfs_super_block, sys_chunk_array_size, 32);
2239 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2240 			 struct btrfs_super_block, chunk_root_generation, 64);
2241 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2242 			 root_level, 8);
2243 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2244 			 chunk_root, 64);
2245 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2246 			 chunk_root_level, 8);
2247 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2248 			 log_root, 64);
2249 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2250 			 log_root_transid, 64);
2251 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2252 			 log_root_level, 8);
2253 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2254 			 total_bytes, 64);
2255 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2256 			 bytes_used, 64);
2257 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2258 			 sectorsize, 32);
2259 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2260 			 nodesize, 32);
2261 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2262 			 stripesize, 32);
2263 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2264 			 root_dir_objectid, 64);
2265 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2266 			 num_devices, 64);
2267 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2268 			 compat_flags, 64);
2269 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2270 			 compat_ro_flags, 64);
2271 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2272 			 incompat_flags, 64);
2273 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2274 			 csum_type, 16);
2275 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2276 			 cache_generation, 64);
2277 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2278 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2279 			 uuid_tree_generation, 64);
2280 
2281 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2282 {
2283 	u16 t = btrfs_super_csum_type(s);
2284 	/*
2285 	 * csum type is validated at mount time
2286 	 */
2287 	return btrfs_csum_sizes[t];
2288 }
2289 
2290 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2291 {
2292 	return offsetof(struct btrfs_leaf, items);
2293 }
2294 
2295 /* struct btrfs_file_extent_item */
2296 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2297 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2298 			 struct btrfs_file_extent_item, disk_bytenr, 64);
2299 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2300 			 struct btrfs_file_extent_item, offset, 64);
2301 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2302 			 struct btrfs_file_extent_item, generation, 64);
2303 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2304 			 struct btrfs_file_extent_item, num_bytes, 64);
2305 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2306 			 struct btrfs_file_extent_item, disk_num_bytes, 64);
2307 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2308 			 struct btrfs_file_extent_item, compression, 8);
2309 
2310 static inline unsigned long
2311 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2312 {
2313 	return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2314 }
2315 
2316 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2317 {
2318 	return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2319 }
2320 
2321 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2322 		   disk_bytenr, 64);
2323 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2324 		   generation, 64);
2325 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2326 		   disk_num_bytes, 64);
2327 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2328 		  offset, 64);
2329 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2330 		   num_bytes, 64);
2331 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2332 		   ram_bytes, 64);
2333 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2334 		   compression, 8);
2335 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2336 		   encryption, 8);
2337 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2338 		   other_encoding, 16);
2339 
2340 /*
2341  * this returns the number of bytes used by the item on disk, minus the
2342  * size of any extent headers.  If a file is compressed on disk, this is
2343  * the compressed size
2344  */
2345 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2346 						    struct btrfs_item *e)
2347 {
2348 	return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2349 }
2350 
2351 /* this returns the number of file bytes represented by the inline item.
2352  * If an item is compressed, this is the uncompressed size
2353  */
2354 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2355 					       int slot,
2356 					       struct btrfs_file_extent_item *fi)
2357 {
2358 	struct btrfs_map_token token;
2359 
2360 	btrfs_init_map_token(&token);
2361 	/*
2362 	 * return the space used on disk if this item isn't
2363 	 * compressed or encoded
2364 	 */
2365 	if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
2366 	    btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
2367 	    btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
2368 		return btrfs_file_extent_inline_item_len(eb,
2369 							 btrfs_item_nr(slot));
2370 	}
2371 
2372 	/* otherwise use the ram bytes field */
2373 	return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
2374 }
2375 
2376 
2377 /* btrfs_dev_stats_item */
2378 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
2379 					struct btrfs_dev_stats_item *ptr,
2380 					int index)
2381 {
2382 	u64 val;
2383 
2384 	read_extent_buffer(eb, &val,
2385 			   offsetof(struct btrfs_dev_stats_item, values) +
2386 			    ((unsigned long)ptr) + (index * sizeof(u64)),
2387 			   sizeof(val));
2388 	return val;
2389 }
2390 
2391 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2392 					     struct btrfs_dev_stats_item *ptr,
2393 					     int index, u64 val)
2394 {
2395 	write_extent_buffer(eb, &val,
2396 			    offsetof(struct btrfs_dev_stats_item, values) +
2397 			     ((unsigned long)ptr) + (index * sizeof(u64)),
2398 			    sizeof(val));
2399 }
2400 
2401 /* btrfs_qgroup_status_item */
2402 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2403 		   generation, 64);
2404 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2405 		   version, 64);
2406 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2407 		   flags, 64);
2408 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2409 		   rescan, 64);
2410 
2411 /* btrfs_qgroup_info_item */
2412 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2413 		   generation, 64);
2414 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2415 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2416 		   rfer_cmpr, 64);
2417 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2418 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2419 		   excl_cmpr, 64);
2420 
2421 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2422 			 struct btrfs_qgroup_info_item, generation, 64);
2423 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2424 			 rfer, 64);
2425 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2426 			 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2427 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2428 			 excl, 64);
2429 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2430 			 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2431 
2432 /* btrfs_qgroup_limit_item */
2433 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2434 		   flags, 64);
2435 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2436 		   max_rfer, 64);
2437 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2438 		   max_excl, 64);
2439 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2440 		   rsv_rfer, 64);
2441 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2442 		   rsv_excl, 64);
2443 
2444 /* btrfs_dev_replace_item */
2445 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2446 		   struct btrfs_dev_replace_item, src_devid, 64);
2447 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2448 		   struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2449 		   64);
2450 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2451 		   replace_state, 64);
2452 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2453 		   time_started, 64);
2454 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2455 		   time_stopped, 64);
2456 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2457 		   num_write_errors, 64);
2458 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2459 		   struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2460 		   64);
2461 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2462 		   cursor_left, 64);
2463 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2464 		   cursor_right, 64);
2465 
2466 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2467 			 struct btrfs_dev_replace_item, src_devid, 64);
2468 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2469 			 struct btrfs_dev_replace_item,
2470 			 cont_reading_from_srcdev_mode, 64);
2471 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2472 			 struct btrfs_dev_replace_item, replace_state, 64);
2473 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2474 			 struct btrfs_dev_replace_item, time_started, 64);
2475 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2476 			 struct btrfs_dev_replace_item, time_stopped, 64);
2477 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2478 			 struct btrfs_dev_replace_item, num_write_errors, 64);
2479 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2480 			 struct btrfs_dev_replace_item,
2481 			 num_uncorrectable_read_errors, 64);
2482 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2483 			 struct btrfs_dev_replace_item, cursor_left, 64);
2484 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2485 			 struct btrfs_dev_replace_item, cursor_right, 64);
2486 
2487 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
2488 {
2489 	return sb->s_fs_info;
2490 }
2491 
2492 /* helper function to cast into the data area of the leaf. */
2493 #define btrfs_item_ptr(leaf, slot, type) \
2494 	((type *)(btrfs_leaf_data(leaf) + \
2495 	btrfs_item_offset_nr(leaf, slot)))
2496 
2497 #define btrfs_item_ptr_offset(leaf, slot) \
2498 	((unsigned long)(btrfs_leaf_data(leaf) + \
2499 	btrfs_item_offset_nr(leaf, slot)))
2500 
2501 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2502 {
2503 	return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2504 		(space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2505 }
2506 
2507 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2508 {
2509 	return mapping_gfp_constraint(mapping, ~__GFP_FS);
2510 }
2511 
2512 /* extent-tree.c */
2513 
2514 u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes);
2515 
2516 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
2517 						 unsigned num_items)
2518 {
2519 	return root->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2520 }
2521 
2522 /*
2523  * Doing a truncate won't result in new nodes or leaves, just what we need for
2524  * COW.
2525  */
2526 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
2527 						 unsigned num_items)
2528 {
2529 	return root->nodesize * BTRFS_MAX_LEVEL * num_items;
2530 }
2531 
2532 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
2533 				       struct btrfs_root *root);
2534 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
2535 				       struct btrfs_root *root);
2536 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2537 					 const u64 start);
2538 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2539 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2540 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2541 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2542 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2543 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2544 			   struct btrfs_root *root, unsigned long count);
2545 int btrfs_async_run_delayed_refs(struct btrfs_root *root,
2546 				 unsigned long count, u64 transid, int wait);
2547 int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len);
2548 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2549 			     struct btrfs_root *root, u64 bytenr,
2550 			     u64 offset, int metadata, u64 *refs, u64 *flags);
2551 int btrfs_pin_extent(struct btrfs_root *root,
2552 		     u64 bytenr, u64 num, int reserved);
2553 int btrfs_pin_extent_for_log_replay(struct btrfs_root *root,
2554 				    u64 bytenr, u64 num_bytes);
2555 int btrfs_exclude_logged_extents(struct btrfs_root *root,
2556 				 struct extent_buffer *eb);
2557 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
2558 			  struct btrfs_root *root,
2559 			  u64 objectid, u64 offset, u64 bytenr);
2560 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2561 						 struct btrfs_fs_info *info,
2562 						 u64 bytenr);
2563 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2564 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2565 int get_block_group_index(struct btrfs_block_group_cache *cache);
2566 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2567 					struct btrfs_root *root, u64 parent,
2568 					u64 root_objectid,
2569 					struct btrfs_disk_key *key, int level,
2570 					u64 hint, u64 empty_size);
2571 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2572 			   struct btrfs_root *root,
2573 			   struct extent_buffer *buf,
2574 			   u64 parent, int last_ref);
2575 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2576 				     struct btrfs_root *root,
2577 				     u64 root_objectid, u64 owner,
2578 				     u64 offset, u64 ram_bytes,
2579 				     struct btrfs_key *ins);
2580 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2581 				   struct btrfs_root *root,
2582 				   u64 root_objectid, u64 owner, u64 offset,
2583 				   struct btrfs_key *ins);
2584 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2585 			 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2586 			 struct btrfs_key *ins, int is_data, int delalloc);
2587 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2588 		  struct extent_buffer *buf, int full_backref);
2589 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2590 		  struct extent_buffer *buf, int full_backref);
2591 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2592 				struct btrfs_root *root,
2593 				u64 bytenr, u64 num_bytes, u64 flags,
2594 				int level, int is_data);
2595 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2596 		      struct btrfs_root *root,
2597 		      u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2598 		      u64 owner, u64 offset);
2599 
2600 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len,
2601 			       int delalloc);
2602 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
2603 				       u64 start, u64 len);
2604 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2605 				 struct btrfs_root *root);
2606 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2607 			       struct btrfs_root *root);
2608 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2609 			 struct btrfs_root *root,
2610 			 u64 bytenr, u64 num_bytes, u64 parent,
2611 			 u64 root_objectid, u64 owner, u64 offset);
2612 
2613 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
2614 				   struct btrfs_root *root);
2615 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2616 				    struct btrfs_root *root);
2617 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2618 			    struct btrfs_root *root);
2619 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
2620 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2621 int btrfs_read_block_groups(struct btrfs_root *root);
2622 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
2623 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2624 			   struct btrfs_root *root, u64 bytes_used,
2625 			   u64 type, u64 chunk_objectid, u64 chunk_offset,
2626 			   u64 size);
2627 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2628 				struct btrfs_fs_info *fs_info,
2629 				const u64 chunk_offset);
2630 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2631 			     struct btrfs_root *root, u64 group_start,
2632 			     struct extent_map *em);
2633 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2634 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2635 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2636 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
2637 				       struct btrfs_root *root);
2638 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
2639 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2640 
2641 enum btrfs_reserve_flush_enum {
2642 	/* If we are in the transaction, we can't flush anything.*/
2643 	BTRFS_RESERVE_NO_FLUSH,
2644 	/*
2645 	 * Flushing delalloc may cause deadlock somewhere, in this
2646 	 * case, use FLUSH LIMIT
2647 	 */
2648 	BTRFS_RESERVE_FLUSH_LIMIT,
2649 	BTRFS_RESERVE_FLUSH_ALL,
2650 };
2651 
2652 enum btrfs_flush_state {
2653 	FLUSH_DELAYED_ITEMS_NR	=	1,
2654 	FLUSH_DELAYED_ITEMS	=	2,
2655 	FLUSH_DELALLOC		=	3,
2656 	FLUSH_DELALLOC_WAIT	=	4,
2657 	ALLOC_CHUNK		=	5,
2658 	COMMIT_TRANS		=	6,
2659 };
2660 
2661 int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len);
2662 int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes);
2663 void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len);
2664 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2665 					    u64 len);
2666 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
2667 				struct btrfs_root *root);
2668 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2669 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
2670 				  struct inode *inode);
2671 void btrfs_orphan_release_metadata(struct inode *inode);
2672 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2673 				     struct btrfs_block_rsv *rsv,
2674 				     int nitems,
2675 				     u64 *qgroup_reserved, bool use_global_rsv);
2676 void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2677 				      struct btrfs_block_rsv *rsv,
2678 				      u64 qgroup_reserved);
2679 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
2680 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
2681 int btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len);
2682 void btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len);
2683 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2684 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
2685 					      unsigned short type);
2686 void btrfs_free_block_rsv(struct btrfs_root *root,
2687 			  struct btrfs_block_rsv *rsv);
2688 void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv);
2689 int btrfs_block_rsv_add(struct btrfs_root *root,
2690 			struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2691 			enum btrfs_reserve_flush_enum flush);
2692 int btrfs_block_rsv_check(struct btrfs_root *root,
2693 			  struct btrfs_block_rsv *block_rsv, int min_factor);
2694 int btrfs_block_rsv_refill(struct btrfs_root *root,
2695 			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2696 			   enum btrfs_reserve_flush_enum flush);
2697 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2698 			    struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2699 			    int update_size);
2700 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2701 			     struct btrfs_block_rsv *dest, u64 num_bytes,
2702 			     int min_factor);
2703 void btrfs_block_rsv_release(struct btrfs_root *root,
2704 			     struct btrfs_block_rsv *block_rsv,
2705 			     u64 num_bytes);
2706 int btrfs_inc_block_group_ro(struct btrfs_root *root,
2707 			     struct btrfs_block_group_cache *cache);
2708 void btrfs_dec_block_group_ro(struct btrfs_root *root,
2709 			      struct btrfs_block_group_cache *cache);
2710 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2711 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2712 int btrfs_error_unpin_extent_range(struct btrfs_root *root,
2713 				   u64 start, u64 end);
2714 int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
2715 			 u64 num_bytes, u64 *actual_bytes);
2716 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
2717 			    struct btrfs_root *root, u64 type);
2718 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
2719 
2720 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2721 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2722 					 struct btrfs_fs_info *fs_info);
2723 int __get_raid_index(u64 flags);
2724 int btrfs_start_write_no_snapshoting(struct btrfs_root *root);
2725 void btrfs_end_write_no_snapshoting(struct btrfs_root *root);
2726 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2727 void check_system_chunk(struct btrfs_trans_handle *trans,
2728 			struct btrfs_root *root,
2729 			const u64 type);
2730 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2731 		       struct btrfs_fs_info *info, u64 start, u64 end);
2732 
2733 /* ctree.c */
2734 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2735 		     int level, int *slot);
2736 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2737 int btrfs_previous_item(struct btrfs_root *root,
2738 			struct btrfs_path *path, u64 min_objectid,
2739 			int type);
2740 int btrfs_previous_extent_item(struct btrfs_root *root,
2741 			struct btrfs_path *path, u64 min_objectid);
2742 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2743 			     struct btrfs_path *path,
2744 			     struct btrfs_key *new_key);
2745 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2746 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2747 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2748 			struct btrfs_key *key, int lowest_level,
2749 			u64 min_trans);
2750 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2751 			 struct btrfs_path *path,
2752 			 u64 min_trans);
2753 enum btrfs_compare_tree_result {
2754 	BTRFS_COMPARE_TREE_NEW,
2755 	BTRFS_COMPARE_TREE_DELETED,
2756 	BTRFS_COMPARE_TREE_CHANGED,
2757 	BTRFS_COMPARE_TREE_SAME,
2758 };
2759 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
2760 				  struct btrfs_root *right_root,
2761 				  struct btrfs_path *left_path,
2762 				  struct btrfs_path *right_path,
2763 				  struct btrfs_key *key,
2764 				  enum btrfs_compare_tree_result result,
2765 				  void *ctx);
2766 int btrfs_compare_trees(struct btrfs_root *left_root,
2767 			struct btrfs_root *right_root,
2768 			btrfs_changed_cb_t cb, void *ctx);
2769 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2770 		    struct btrfs_root *root, struct extent_buffer *buf,
2771 		    struct extent_buffer *parent, int parent_slot,
2772 		    struct extent_buffer **cow_ret);
2773 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2774 		      struct btrfs_root *root,
2775 		      struct extent_buffer *buf,
2776 		      struct extent_buffer **cow_ret, u64 new_root_objectid);
2777 int btrfs_block_can_be_shared(struct btrfs_root *root,
2778 			      struct extent_buffer *buf);
2779 void btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path,
2780 		       u32 data_size);
2781 void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
2782 			 u32 new_size, int from_end);
2783 int btrfs_split_item(struct btrfs_trans_handle *trans,
2784 		     struct btrfs_root *root,
2785 		     struct btrfs_path *path,
2786 		     struct btrfs_key *new_key,
2787 		     unsigned long split_offset);
2788 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2789 			 struct btrfs_root *root,
2790 			 struct btrfs_path *path,
2791 			 struct btrfs_key *new_key);
2792 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2793 		u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2794 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2795 		      *root, struct btrfs_key *key, struct btrfs_path *p, int
2796 		      ins_len, int cow);
2797 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
2798 			  struct btrfs_path *p, u64 time_seq);
2799 int btrfs_search_slot_for_read(struct btrfs_root *root,
2800 			       struct btrfs_key *key, struct btrfs_path *p,
2801 			       int find_higher, int return_any);
2802 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2803 		       struct btrfs_root *root, struct extent_buffer *parent,
2804 		       int start_slot, u64 *last_ret,
2805 		       struct btrfs_key *progress);
2806 void btrfs_release_path(struct btrfs_path *p);
2807 struct btrfs_path *btrfs_alloc_path(void);
2808 void btrfs_free_path(struct btrfs_path *p);
2809 void btrfs_set_path_blocking(struct btrfs_path *p);
2810 void btrfs_clear_path_blocking(struct btrfs_path *p,
2811 			       struct extent_buffer *held, int held_rw);
2812 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2813 
2814 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2815 		   struct btrfs_path *path, int slot, int nr);
2816 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2817 				 struct btrfs_root *root,
2818 				 struct btrfs_path *path)
2819 {
2820 	return btrfs_del_items(trans, root, path, path->slots[0], 1);
2821 }
2822 
2823 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2824 			    struct btrfs_key *cpu_key, u32 *data_size,
2825 			    u32 total_data, u32 total_size, int nr);
2826 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2827 		      *root, struct btrfs_key *key, void *data, u32 data_size);
2828 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2829 			     struct btrfs_root *root,
2830 			     struct btrfs_path *path,
2831 			     struct btrfs_key *cpu_key, u32 *data_size, int nr);
2832 
2833 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2834 					  struct btrfs_root *root,
2835 					  struct btrfs_path *path,
2836 					  struct btrfs_key *key,
2837 					  u32 data_size)
2838 {
2839 	return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2840 }
2841 
2842 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2843 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2844 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2845 			u64 time_seq);
2846 static inline int btrfs_next_old_item(struct btrfs_root *root,
2847 				      struct btrfs_path *p, u64 time_seq)
2848 {
2849 	++p->slots[0];
2850 	if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2851 		return btrfs_next_old_leaf(root, p, time_seq);
2852 	return 0;
2853 }
2854 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2855 {
2856 	return btrfs_next_old_item(root, p, 0);
2857 }
2858 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2859 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2860 				     struct btrfs_block_rsv *block_rsv,
2861 				     int update_ref, int for_reloc);
2862 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2863 			struct btrfs_root *root,
2864 			struct extent_buffer *node,
2865 			struct extent_buffer *parent);
2866 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2867 {
2868 	/*
2869 	 * Get synced with close_ctree()
2870 	 */
2871 	smp_mb();
2872 	return fs_info->closing;
2873 }
2874 
2875 /*
2876  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2877  * anything except sleeping. This function is used to check the status of
2878  * the fs.
2879  */
2880 static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root)
2881 {
2882 	return (root->fs_info->sb->s_flags & MS_RDONLY ||
2883 		btrfs_fs_closing(root->fs_info));
2884 }
2885 
2886 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2887 {
2888 	kfree(fs_info->balance_ctl);
2889 	kfree(fs_info->delayed_root);
2890 	kfree(fs_info->extent_root);
2891 	kfree(fs_info->tree_root);
2892 	kfree(fs_info->chunk_root);
2893 	kfree(fs_info->dev_root);
2894 	kfree(fs_info->csum_root);
2895 	kfree(fs_info->quota_root);
2896 	kfree(fs_info->uuid_root);
2897 	kfree(fs_info->free_space_root);
2898 	kfree(fs_info->super_copy);
2899 	kfree(fs_info->super_for_commit);
2900 	security_free_mnt_opts(&fs_info->security_opts);
2901 	kfree(fs_info);
2902 }
2903 
2904 /* tree mod log functions from ctree.c */
2905 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2906 			   struct seq_list *elem);
2907 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2908 			    struct seq_list *elem);
2909 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2910 
2911 /* root-item.c */
2912 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2913 		       struct btrfs_root *tree_root,
2914 		       u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2915 		       const char *name, int name_len);
2916 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2917 		       struct btrfs_root *tree_root,
2918 		       u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2919 		       const char *name, int name_len);
2920 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2921 		   struct btrfs_key *key);
2922 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2923 		      *root, struct btrfs_key *key, struct btrfs_root_item
2924 		      *item);
2925 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2926 				   struct btrfs_root *root,
2927 				   struct btrfs_key *key,
2928 				   struct btrfs_root_item *item);
2929 int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key,
2930 		    struct btrfs_path *path, struct btrfs_root_item *root_item,
2931 		    struct btrfs_key *root_key);
2932 int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
2933 void btrfs_set_root_node(struct btrfs_root_item *item,
2934 			 struct extent_buffer *node);
2935 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2936 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2937 			     struct btrfs_root *root);
2938 
2939 /* uuid-tree.c */
2940 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
2941 			struct btrfs_root *uuid_root, u8 *uuid, u8 type,
2942 			u64 subid);
2943 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
2944 			struct btrfs_root *uuid_root, u8 *uuid, u8 type,
2945 			u64 subid);
2946 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
2947 			    int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
2948 					      u64));
2949 
2950 /* dir-item.c */
2951 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
2952 			  const char *name, int name_len);
2953 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2954 			  struct btrfs_root *root, const char *name,
2955 			  int name_len, struct inode *dir,
2956 			  struct btrfs_key *location, u8 type, u64 index);
2957 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2958 					     struct btrfs_root *root,
2959 					     struct btrfs_path *path, u64 dir,
2960 					     const char *name, int name_len,
2961 					     int mod);
2962 struct btrfs_dir_item *
2963 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2964 			    struct btrfs_root *root,
2965 			    struct btrfs_path *path, u64 dir,
2966 			    u64 objectid, const char *name, int name_len,
2967 			    int mod);
2968 struct btrfs_dir_item *
2969 btrfs_search_dir_index_item(struct btrfs_root *root,
2970 			    struct btrfs_path *path, u64 dirid,
2971 			    const char *name, int name_len);
2972 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2973 			      struct btrfs_root *root,
2974 			      struct btrfs_path *path,
2975 			      struct btrfs_dir_item *di);
2976 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2977 			    struct btrfs_root *root,
2978 			    struct btrfs_path *path, u64 objectid,
2979 			    const char *name, u16 name_len,
2980 			    const void *data, u16 data_len);
2981 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2982 					  struct btrfs_root *root,
2983 					  struct btrfs_path *path, u64 dir,
2984 					  const char *name, u16 name_len,
2985 					  int mod);
2986 int verify_dir_item(struct btrfs_root *root,
2987 		    struct extent_buffer *leaf,
2988 		    struct btrfs_dir_item *dir_item);
2989 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2990 						 struct btrfs_path *path,
2991 						 const char *name,
2992 						 int name_len);
2993 
2994 /* orphan.c */
2995 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2996 			     struct btrfs_root *root, u64 offset);
2997 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2998 			  struct btrfs_root *root, u64 offset);
2999 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3000 
3001 /* inode-item.c */
3002 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3003 			   struct btrfs_root *root,
3004 			   const char *name, int name_len,
3005 			   u64 inode_objectid, u64 ref_objectid, u64 index);
3006 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3007 			   struct btrfs_root *root,
3008 			   const char *name, int name_len,
3009 			   u64 inode_objectid, u64 ref_objectid, u64 *index);
3010 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3011 			     struct btrfs_root *root,
3012 			     struct btrfs_path *path, u64 objectid);
3013 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3014 		       *root, struct btrfs_path *path,
3015 		       struct btrfs_key *location, int mod);
3016 
3017 struct btrfs_inode_extref *
3018 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3019 			  struct btrfs_root *root,
3020 			  struct btrfs_path *path,
3021 			  const char *name, int name_len,
3022 			  u64 inode_objectid, u64 ref_objectid, int ins_len,
3023 			  int cow);
3024 
3025 int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
3026 				   u64 ref_objectid, const char *name,
3027 				   int name_len,
3028 				   struct btrfs_inode_extref **extref_ret);
3029 
3030 /* file-item.c */
3031 struct btrfs_dio_private;
3032 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3033 		    struct btrfs_root *root, u64 bytenr, u64 len);
3034 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
3035 			  struct bio *bio, u32 *dst);
3036 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
3037 			      struct bio *bio, u64 logical_offset);
3038 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3039 			     struct btrfs_root *root,
3040 			     u64 objectid, u64 pos,
3041 			     u64 disk_offset, u64 disk_num_bytes,
3042 			     u64 num_bytes, u64 offset, u64 ram_bytes,
3043 			     u8 compression, u8 encryption, u16 other_encoding);
3044 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3045 			     struct btrfs_root *root,
3046 			     struct btrfs_path *path, u64 objectid,
3047 			     u64 bytenr, int mod);
3048 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3049 			   struct btrfs_root *root,
3050 			   struct btrfs_ordered_sum *sums);
3051 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
3052 		       struct bio *bio, u64 file_start, int contig);
3053 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3054 			     struct list_head *list, int search_commit);
3055 void btrfs_extent_item_to_extent_map(struct inode *inode,
3056 				     const struct btrfs_path *path,
3057 				     struct btrfs_file_extent_item *fi,
3058 				     const bool new_inline,
3059 				     struct extent_map *em);
3060 
3061 /* inode.c */
3062 struct btrfs_delalloc_work {
3063 	struct inode *inode;
3064 	int delay_iput;
3065 	struct completion completion;
3066 	struct list_head list;
3067 	struct btrfs_work work;
3068 };
3069 
3070 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3071 						    int delay_iput);
3072 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3073 
3074 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3075 					   size_t pg_offset, u64 start, u64 len,
3076 					   int create);
3077 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3078 			      u64 *orig_start, u64 *orig_block_len,
3079 			      u64 *ram_bytes);
3080 
3081 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3082 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3083 #define ClearPageChecked ClearPageFsMisc
3084 #define SetPageChecked SetPageFsMisc
3085 #define PageChecked PageFsMisc
3086 #endif
3087 
3088 /* This forces readahead on a given range of bytes in an inode */
3089 static inline void btrfs_force_ra(struct address_space *mapping,
3090 				  struct file_ra_state *ra, struct file *file,
3091 				  pgoff_t offset, unsigned long req_size)
3092 {
3093 	page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3094 }
3095 
3096 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3097 int btrfs_set_inode_index(struct inode *dir, u64 *index);
3098 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3099 		       struct btrfs_root *root,
3100 		       struct inode *dir, struct inode *inode,
3101 		       const char *name, int name_len);
3102 int btrfs_add_link(struct btrfs_trans_handle *trans,
3103 		   struct inode *parent_inode, struct inode *inode,
3104 		   const char *name, int name_len, int add_backref, u64 index);
3105 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3106 			struct btrfs_root *root,
3107 			struct inode *dir, u64 objectid,
3108 			const char *name, int name_len);
3109 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3110 			int front);
3111 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3112 			       struct btrfs_root *root,
3113 			       struct inode *inode, u64 new_size,
3114 			       u32 min_type);
3115 
3116 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3117 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
3118 			       int nr);
3119 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3120 			      struct extent_state **cached_state);
3121 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3122 			     struct btrfs_root *new_root,
3123 			     struct btrfs_root *parent_root,
3124 			     u64 new_dirid);
3125 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3126 			 size_t size, struct bio *bio,
3127 			 unsigned long bio_flags);
3128 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
3129 int btrfs_readpage(struct file *file, struct page *page);
3130 void btrfs_evict_inode(struct inode *inode);
3131 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3132 struct inode *btrfs_alloc_inode(struct super_block *sb);
3133 void btrfs_destroy_inode(struct inode *inode);
3134 int btrfs_drop_inode(struct inode *inode);
3135 int btrfs_init_cachep(void);
3136 void btrfs_destroy_cachep(void);
3137 long btrfs_ioctl_trans_end(struct file *file);
3138 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3139 			 struct btrfs_root *root, int *was_new);
3140 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3141 				    size_t pg_offset, u64 start, u64 end,
3142 				    int create);
3143 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3144 			      struct btrfs_root *root,
3145 			      struct inode *inode);
3146 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3147 				struct btrfs_root *root, struct inode *inode);
3148 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3149 int btrfs_orphan_cleanup(struct btrfs_root *root);
3150 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3151 			      struct btrfs_root *root);
3152 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3153 void btrfs_invalidate_inodes(struct btrfs_root *root);
3154 void btrfs_add_delayed_iput(struct inode *inode);
3155 void btrfs_run_delayed_iputs(struct btrfs_root *root);
3156 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3157 			      u64 start, u64 num_bytes, u64 min_size,
3158 			      loff_t actual_len, u64 *alloc_hint);
3159 int btrfs_prealloc_file_range_trans(struct inode *inode,
3160 				    struct btrfs_trans_handle *trans, int mode,
3161 				    u64 start, u64 num_bytes, u64 min_size,
3162 				    loff_t actual_len, u64 *alloc_hint);
3163 int btrfs_inode_check_errors(struct inode *inode);
3164 extern const struct dentry_operations btrfs_dentry_operations;
3165 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3166 void btrfs_test_inode_set_ops(struct inode *inode);
3167 #endif
3168 
3169 /* ioctl.c */
3170 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3171 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3172 int btrfs_ioctl_get_supported_features(void __user *arg);
3173 void btrfs_update_iflags(struct inode *inode);
3174 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3175 int btrfs_is_empty_uuid(u8 *uuid);
3176 int btrfs_defrag_file(struct inode *inode, struct file *file,
3177 		      struct btrfs_ioctl_defrag_range_args *range,
3178 		      u64 newer_than, unsigned long max_pages);
3179 void btrfs_get_block_group_info(struct list_head *groups_list,
3180 				struct btrfs_ioctl_space_info *space);
3181 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3182 			       struct btrfs_ioctl_balance_args *bargs);
3183 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3184 			   struct file *dst_file, u64 dst_loff);
3185 
3186 /* file.c */
3187 int btrfs_auto_defrag_init(void);
3188 void btrfs_auto_defrag_exit(void);
3189 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3190 			   struct inode *inode);
3191 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3192 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3193 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3194 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3195 			     int skip_pinned);
3196 extern const struct file_operations btrfs_file_operations;
3197 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3198 			 struct btrfs_root *root, struct inode *inode,
3199 			 struct btrfs_path *path, u64 start, u64 end,
3200 			 u64 *drop_end, int drop_cache,
3201 			 int replace_extent,
3202 			 u32 extent_item_size,
3203 			 int *key_inserted);
3204 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3205 		       struct btrfs_root *root, struct inode *inode, u64 start,
3206 		       u64 end, int drop_cache);
3207 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3208 			      struct inode *inode, u64 start, u64 end);
3209 int btrfs_release_file(struct inode *inode, struct file *file);
3210 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
3211 		      struct page **pages, size_t num_pages,
3212 		      loff_t pos, size_t write_bytes,
3213 		      struct extent_state **cached);
3214 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3215 ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in,
3216 			      struct file *file_out, loff_t pos_out,
3217 			      size_t len, unsigned int flags);
3218 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
3219 			   struct file *file_out, loff_t pos_out, u64 len);
3220 
3221 /* tree-defrag.c */
3222 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3223 			struct btrfs_root *root);
3224 
3225 /* sysfs.c */
3226 int btrfs_init_sysfs(void);
3227 void btrfs_exit_sysfs(void);
3228 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3229 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3230 
3231 /* xattr.c */
3232 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3233 
3234 /* super.c */
3235 int btrfs_parse_options(struct btrfs_root *root, char *options,
3236 			unsigned long new_flags);
3237 int btrfs_sync_fs(struct super_block *sb, int wait);
3238 
3239 #ifdef CONFIG_PRINTK
3240 __printf(2, 3)
3241 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3242 #else
3243 static inline __printf(2, 3)
3244 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3245 {
3246 }
3247 #endif
3248 
3249 #define btrfs_emerg(fs_info, fmt, args...) \
3250 	btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3251 #define btrfs_alert(fs_info, fmt, args...) \
3252 	btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3253 #define btrfs_crit(fs_info, fmt, args...) \
3254 	btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3255 #define btrfs_err(fs_info, fmt, args...) \
3256 	btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3257 #define btrfs_warn(fs_info, fmt, args...) \
3258 	btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3259 #define btrfs_notice(fs_info, fmt, args...) \
3260 	btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3261 #define btrfs_info(fs_info, fmt, args...) \
3262 	btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3263 
3264 /*
3265  * Wrappers that use printk_in_rcu
3266  */
3267 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3268 	btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3269 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3270 	btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3271 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3272 	btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3273 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3274 	btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3275 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3276 	btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3277 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3278 	btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3279 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3280 	btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3281 
3282 /*
3283  * Wrappers that use a ratelimited printk_in_rcu
3284  */
3285 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3286 	btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3287 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3288 	btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3289 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3290 	btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3291 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3292 	btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3293 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3294 	btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3295 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3296 	btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3297 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3298 	btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3299 
3300 /*
3301  * Wrappers that use a ratelimited printk
3302  */
3303 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3304 	btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3305 #define btrfs_alert_rl(fs_info, fmt, args...) \
3306 	btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3307 #define btrfs_crit_rl(fs_info, fmt, args...) \
3308 	btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3309 #define btrfs_err_rl(fs_info, fmt, args...) \
3310 	btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3311 #define btrfs_warn_rl(fs_info, fmt, args...) \
3312 	btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3313 #define btrfs_notice_rl(fs_info, fmt, args...) \
3314 	btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3315 #define btrfs_info_rl(fs_info, fmt, args...) \
3316 	btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3317 #ifdef DEBUG
3318 #define btrfs_debug(fs_info, fmt, args...) \
3319 	btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3320 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3321 	btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3322 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3323 	btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3324 #define btrfs_debug_rl(fs_info, fmt, args...) \
3325 	btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3326 #else
3327 #define btrfs_debug(fs_info, fmt, args...) \
3328     no_printk(KERN_DEBUG fmt, ##args)
3329 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3330 	no_printk(KERN_DEBUG fmt, ##args)
3331 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3332 	no_printk(KERN_DEBUG fmt, ##args)
3333 #define btrfs_debug_rl(fs_info, fmt, args...) \
3334 	no_printk(KERN_DEBUG fmt, ##args)
3335 #endif
3336 
3337 #define btrfs_printk_in_rcu(fs_info, fmt, args...)	\
3338 do {							\
3339 	rcu_read_lock();				\
3340 	btrfs_printk(fs_info, fmt, ##args);		\
3341 	rcu_read_unlock();				\
3342 } while (0)
3343 
3344 #define btrfs_printk_ratelimited(fs_info, fmt, args...)		\
3345 do {								\
3346 	static DEFINE_RATELIMIT_STATE(_rs,			\
3347 		DEFAULT_RATELIMIT_INTERVAL,			\
3348 		DEFAULT_RATELIMIT_BURST);       		\
3349 	if (__ratelimit(&_rs))					\
3350 		btrfs_printk(fs_info, fmt, ##args);		\
3351 } while (0)
3352 
3353 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)		\
3354 do {								\
3355 	rcu_read_lock();					\
3356 	btrfs_printk_ratelimited(fs_info, fmt, ##args);		\
3357 	rcu_read_unlock();					\
3358 } while (0)
3359 
3360 #ifdef CONFIG_BTRFS_ASSERT
3361 
3362 __cold
3363 static inline void assfail(char *expr, char *file, int line)
3364 {
3365 	pr_err("BTRFS: assertion failed: %s, file: %s, line: %d",
3366 	       expr, file, line);
3367 	BUG();
3368 }
3369 
3370 #define ASSERT(expr)	\
3371 	(likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3372 #else
3373 #define ASSERT(expr)	((void)0)
3374 #endif
3375 
3376 __printf(5, 6)
3377 __cold
3378 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3379 		     unsigned int line, int errno, const char *fmt, ...);
3380 
3381 const char *btrfs_decode_error(int errno);
3382 
3383 __cold
3384 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3385 			       const char *function,
3386 			       unsigned int line, int errno);
3387 
3388 /*
3389  * Call btrfs_abort_transaction as early as possible when an error condition is
3390  * detected, that way the exact line number is reported.
3391  */
3392 #define btrfs_abort_transaction(trans, errno)		\
3393 do {								\
3394 	/* Report first abort since mount */			\
3395 	if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,	\
3396 			&((trans)->fs_info->fs_state))) {	\
3397 		WARN(1, KERN_DEBUG				\
3398 		"BTRFS: Transaction aborted (error %d)\n",	\
3399 		(errno));					\
3400 	}							\
3401 	__btrfs_abort_transaction((trans), __func__,		\
3402 				  __LINE__, (errno));		\
3403 } while (0)
3404 
3405 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)		\
3406 do {								\
3407 	__btrfs_handle_fs_error((fs_info), __func__, __LINE__,	\
3408 			  (errno), fmt, ##args);		\
3409 } while (0)
3410 
3411 __printf(5, 6)
3412 __cold
3413 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3414 		   unsigned int line, int errno, const char *fmt, ...);
3415 /*
3416  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3417  * will panic().  Otherwise we BUG() here.
3418  */
3419 #define btrfs_panic(fs_info, errno, fmt, args...)			\
3420 do {									\
3421 	__btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args);	\
3422 	BUG();								\
3423 } while (0)
3424 
3425 
3426 /* compatibility and incompatibility defines */
3427 
3428 #define btrfs_set_fs_incompat(__fs_info, opt) \
3429 	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3430 
3431 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3432 					   u64 flag)
3433 {
3434 	struct btrfs_super_block *disk_super;
3435 	u64 features;
3436 
3437 	disk_super = fs_info->super_copy;
3438 	features = btrfs_super_incompat_flags(disk_super);
3439 	if (!(features & flag)) {
3440 		spin_lock(&fs_info->super_lock);
3441 		features = btrfs_super_incompat_flags(disk_super);
3442 		if (!(features & flag)) {
3443 			features |= flag;
3444 			btrfs_set_super_incompat_flags(disk_super, features);
3445 			btrfs_info(fs_info, "setting %llu feature flag",
3446 					 flag);
3447 		}
3448 		spin_unlock(&fs_info->super_lock);
3449 	}
3450 }
3451 
3452 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3453 	__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3454 
3455 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3456 					     u64 flag)
3457 {
3458 	struct btrfs_super_block *disk_super;
3459 	u64 features;
3460 
3461 	disk_super = fs_info->super_copy;
3462 	features = btrfs_super_incompat_flags(disk_super);
3463 	if (features & flag) {
3464 		spin_lock(&fs_info->super_lock);
3465 		features = btrfs_super_incompat_flags(disk_super);
3466 		if (features & flag) {
3467 			features &= ~flag;
3468 			btrfs_set_super_incompat_flags(disk_super, features);
3469 			btrfs_info(fs_info, "clearing %llu feature flag",
3470 					 flag);
3471 		}
3472 		spin_unlock(&fs_info->super_lock);
3473 	}
3474 }
3475 
3476 #define btrfs_fs_incompat(fs_info, opt) \
3477 	__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3478 
3479 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3480 {
3481 	struct btrfs_super_block *disk_super;
3482 	disk_super = fs_info->super_copy;
3483 	return !!(btrfs_super_incompat_flags(disk_super) & flag);
3484 }
3485 
3486 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3487 	__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3488 
3489 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3490 					    u64 flag)
3491 {
3492 	struct btrfs_super_block *disk_super;
3493 	u64 features;
3494 
3495 	disk_super = fs_info->super_copy;
3496 	features = btrfs_super_compat_ro_flags(disk_super);
3497 	if (!(features & flag)) {
3498 		spin_lock(&fs_info->super_lock);
3499 		features = btrfs_super_compat_ro_flags(disk_super);
3500 		if (!(features & flag)) {
3501 			features |= flag;
3502 			btrfs_set_super_compat_ro_flags(disk_super, features);
3503 			btrfs_info(fs_info, "setting %llu ro feature flag",
3504 				   flag);
3505 		}
3506 		spin_unlock(&fs_info->super_lock);
3507 	}
3508 }
3509 
3510 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3511 	__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3512 
3513 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3514 					      u64 flag)
3515 {
3516 	struct btrfs_super_block *disk_super;
3517 	u64 features;
3518 
3519 	disk_super = fs_info->super_copy;
3520 	features = btrfs_super_compat_ro_flags(disk_super);
3521 	if (features & flag) {
3522 		spin_lock(&fs_info->super_lock);
3523 		features = btrfs_super_compat_ro_flags(disk_super);
3524 		if (features & flag) {
3525 			features &= ~flag;
3526 			btrfs_set_super_compat_ro_flags(disk_super, features);
3527 			btrfs_info(fs_info, "clearing %llu ro feature flag",
3528 				   flag);
3529 		}
3530 		spin_unlock(&fs_info->super_lock);
3531 	}
3532 }
3533 
3534 #define btrfs_fs_compat_ro(fs_info, opt) \
3535 	__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3536 
3537 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3538 {
3539 	struct btrfs_super_block *disk_super;
3540 	disk_super = fs_info->super_copy;
3541 	return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3542 }
3543 
3544 /* acl.c */
3545 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3546 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3547 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3548 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3549 		   struct inode *inode, struct inode *dir);
3550 #else
3551 #define btrfs_get_acl NULL
3552 #define btrfs_set_acl NULL
3553 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3554 				 struct inode *inode, struct inode *dir)
3555 {
3556 	return 0;
3557 }
3558 #endif
3559 
3560 /* relocation.c */
3561 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
3562 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3563 			  struct btrfs_root *root);
3564 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3565 			    struct btrfs_root *root);
3566 int btrfs_recover_relocation(struct btrfs_root *root);
3567 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3568 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3569 			  struct btrfs_root *root, struct extent_buffer *buf,
3570 			  struct extent_buffer *cow);
3571 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3572 			      u64 *bytes_to_reserve);
3573 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3574 			      struct btrfs_pending_snapshot *pending);
3575 
3576 /* scrub.c */
3577 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3578 		    u64 end, struct btrfs_scrub_progress *progress,
3579 		    int readonly, int is_dev_replace);
3580 void btrfs_scrub_pause(struct btrfs_root *root);
3581 void btrfs_scrub_continue(struct btrfs_root *root);
3582 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3583 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3584 			   struct btrfs_device *dev);
3585 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
3586 			 struct btrfs_scrub_progress *progress);
3587 
3588 /* dev-replace.c */
3589 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3590 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3591 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3592 
3593 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3594 {
3595 	btrfs_bio_counter_sub(fs_info, 1);
3596 }
3597 
3598 /* reada.c */
3599 struct reada_control {
3600 	struct btrfs_root	*root;		/* tree to prefetch */
3601 	struct btrfs_key	key_start;
3602 	struct btrfs_key	key_end;	/* exclusive */
3603 	atomic_t		elems;
3604 	struct kref		refcnt;
3605 	wait_queue_head_t	wait;
3606 };
3607 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3608 			      struct btrfs_key *start, struct btrfs_key *end);
3609 int btrfs_reada_wait(void *handle);
3610 void btrfs_reada_detach(void *handle);
3611 int btree_readahead_hook(struct btrfs_fs_info *fs_info,
3612 			 struct extent_buffer *eb, u64 start, int err);
3613 
3614 static inline int is_fstree(u64 rootid)
3615 {
3616 	if (rootid == BTRFS_FS_TREE_OBJECTID ||
3617 	    ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3618 	      !btrfs_qgroup_level(rootid)))
3619 		return 1;
3620 	return 0;
3621 }
3622 
3623 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3624 {
3625 	return signal_pending(current);
3626 }
3627 
3628 /* Sanity test specific functions */
3629 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3630 void btrfs_test_destroy_inode(struct inode *inode);
3631 #endif
3632 
3633 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3634 {
3635 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3636 	if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
3637 			      &fs_info->fs_state)))
3638 		return 1;
3639 #endif
3640 	return 0;
3641 }
3642 #endif
3643