xref: /openbmc/linux/fs/btrfs/ctree.h (revision da2ef666)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2007 Oracle.  All rights reserved.
4  */
5 
6 #ifndef BTRFS_CTREE_H
7 #define BTRFS_CTREE_H
8 
9 #include <linux/mm.h>
10 #include <linux/sched/signal.h>
11 #include <linux/highmem.h>
12 #include <linux/fs.h>
13 #include <linux/rwsem.h>
14 #include <linux/semaphore.h>
15 #include <linux/completion.h>
16 #include <linux/backing-dev.h>
17 #include <linux/wait.h>
18 #include <linux/slab.h>
19 #include <linux/kobject.h>
20 #include <trace/events/btrfs.h>
21 #include <asm/kmap_types.h>
22 #include <linux/pagemap.h>
23 #include <linux/btrfs.h>
24 #include <linux/btrfs_tree.h>
25 #include <linux/workqueue.h>
26 #include <linux/security.h>
27 #include <linux/sizes.h>
28 #include <linux/dynamic_debug.h>
29 #include <linux/refcount.h>
30 #include <linux/crc32c.h>
31 #include "extent_io.h"
32 #include "extent_map.h"
33 #include "async-thread.h"
34 
35 struct btrfs_trans_handle;
36 struct btrfs_transaction;
37 struct btrfs_pending_snapshot;
38 extern struct kmem_cache *btrfs_trans_handle_cachep;
39 extern struct kmem_cache *btrfs_bit_radix_cachep;
40 extern struct kmem_cache *btrfs_path_cachep;
41 extern struct kmem_cache *btrfs_free_space_cachep;
42 struct btrfs_ordered_sum;
43 
44 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
45 #define STATIC noinline
46 #else
47 #define STATIC static noinline
48 #endif
49 
50 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
51 
52 #define BTRFS_MAX_MIRRORS 3
53 
54 #define BTRFS_MAX_LEVEL 8
55 
56 #define BTRFS_OLDEST_GENERATION	0ULL
57 
58 /*
59  * the max metadata block size.  This limit is somewhat artificial,
60  * but the memmove costs go through the roof for larger blocks.
61  */
62 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
63 
64 /*
65  * we can actually store much bigger names, but lets not confuse the rest
66  * of linux
67  */
68 #define BTRFS_NAME_LEN 255
69 
70 /*
71  * Theoretical limit is larger, but we keep this down to a sane
72  * value. That should limit greatly the possibility of collisions on
73  * inode ref items.
74  */
75 #define BTRFS_LINK_MAX 65535U
76 
77 /* four bytes for CRC32 */
78 static const int btrfs_csum_sizes[] = { 4 };
79 
80 #define BTRFS_EMPTY_DIR_SIZE 0
81 
82 /* ioprio of readahead is set to idle */
83 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
84 
85 #define BTRFS_DIRTY_METADATA_THRESH	SZ_32M
86 
87 /*
88  * Use large batch size to reduce overhead of metadata updates.  On the reader
89  * side, we only read it when we are close to ENOSPC and the read overhead is
90  * mostly related to the number of CPUs, so it is OK to use arbitrary large
91  * value here.
92  */
93 #define BTRFS_TOTAL_BYTES_PINNED_BATCH	SZ_128M
94 
95 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
96 
97 
98 /*
99  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
100  */
101 static inline u32 count_max_extents(u64 size)
102 {
103 	return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
104 }
105 
106 struct btrfs_mapping_tree {
107 	struct extent_map_tree map_tree;
108 };
109 
110 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
111 {
112 	BUG_ON(num_stripes == 0);
113 	return sizeof(struct btrfs_chunk) +
114 		sizeof(struct btrfs_stripe) * (num_stripes - 1);
115 }
116 
117 /*
118  * File system states
119  */
120 #define BTRFS_FS_STATE_ERROR		0
121 #define BTRFS_FS_STATE_REMOUNTING	1
122 #define BTRFS_FS_STATE_TRANS_ABORTED	2
123 #define BTRFS_FS_STATE_DEV_REPLACING	3
124 #define BTRFS_FS_STATE_DUMMY_FS_INFO	4
125 
126 #define BTRFS_BACKREF_REV_MAX		256
127 #define BTRFS_BACKREF_REV_SHIFT		56
128 #define BTRFS_BACKREF_REV_MASK		(((u64)BTRFS_BACKREF_REV_MAX - 1) << \
129 					 BTRFS_BACKREF_REV_SHIFT)
130 
131 #define BTRFS_OLD_BACKREF_REV		0
132 #define BTRFS_MIXED_BACKREF_REV		1
133 
134 /*
135  * every tree block (leaf or node) starts with this header.
136  */
137 struct btrfs_header {
138 	/* these first four must match the super block */
139 	u8 csum[BTRFS_CSUM_SIZE];
140 	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
141 	__le64 bytenr; /* which block this node is supposed to live in */
142 	__le64 flags;
143 
144 	/* allowed to be different from the super from here on down */
145 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
146 	__le64 generation;
147 	__le64 owner;
148 	__le32 nritems;
149 	u8 level;
150 } __attribute__ ((__packed__));
151 
152 /*
153  * this is a very generous portion of the super block, giving us
154  * room to translate 14 chunks with 3 stripes each.
155  */
156 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
157 
158 /*
159  * just in case we somehow lose the roots and are not able to mount,
160  * we store an array of the roots from previous transactions
161  * in the super.
162  */
163 #define BTRFS_NUM_BACKUP_ROOTS 4
164 struct btrfs_root_backup {
165 	__le64 tree_root;
166 	__le64 tree_root_gen;
167 
168 	__le64 chunk_root;
169 	__le64 chunk_root_gen;
170 
171 	__le64 extent_root;
172 	__le64 extent_root_gen;
173 
174 	__le64 fs_root;
175 	__le64 fs_root_gen;
176 
177 	__le64 dev_root;
178 	__le64 dev_root_gen;
179 
180 	__le64 csum_root;
181 	__le64 csum_root_gen;
182 
183 	__le64 total_bytes;
184 	__le64 bytes_used;
185 	__le64 num_devices;
186 	/* future */
187 	__le64 unused_64[4];
188 
189 	u8 tree_root_level;
190 	u8 chunk_root_level;
191 	u8 extent_root_level;
192 	u8 fs_root_level;
193 	u8 dev_root_level;
194 	u8 csum_root_level;
195 	/* future and to align */
196 	u8 unused_8[10];
197 } __attribute__ ((__packed__));
198 
199 /*
200  * the super block basically lists the main trees of the FS
201  * it currently lacks any block count etc etc
202  */
203 struct btrfs_super_block {
204 	u8 csum[BTRFS_CSUM_SIZE];
205 	/* the first 4 fields must match struct btrfs_header */
206 	u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
207 	__le64 bytenr; /* this block number */
208 	__le64 flags;
209 
210 	/* allowed to be different from the btrfs_header from here own down */
211 	__le64 magic;
212 	__le64 generation;
213 	__le64 root;
214 	__le64 chunk_root;
215 	__le64 log_root;
216 
217 	/* this will help find the new super based on the log root */
218 	__le64 log_root_transid;
219 	__le64 total_bytes;
220 	__le64 bytes_used;
221 	__le64 root_dir_objectid;
222 	__le64 num_devices;
223 	__le32 sectorsize;
224 	__le32 nodesize;
225 	__le32 __unused_leafsize;
226 	__le32 stripesize;
227 	__le32 sys_chunk_array_size;
228 	__le64 chunk_root_generation;
229 	__le64 compat_flags;
230 	__le64 compat_ro_flags;
231 	__le64 incompat_flags;
232 	__le16 csum_type;
233 	u8 root_level;
234 	u8 chunk_root_level;
235 	u8 log_root_level;
236 	struct btrfs_dev_item dev_item;
237 
238 	char label[BTRFS_LABEL_SIZE];
239 
240 	__le64 cache_generation;
241 	__le64 uuid_tree_generation;
242 
243 	/* future expansion */
244 	__le64 reserved[30];
245 	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
246 	struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
247 } __attribute__ ((__packed__));
248 
249 /*
250  * Compat flags that we support.  If any incompat flags are set other than the
251  * ones specified below then we will fail to mount
252  */
253 #define BTRFS_FEATURE_COMPAT_SUPP		0ULL
254 #define BTRFS_FEATURE_COMPAT_SAFE_SET		0ULL
255 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR		0ULL
256 
257 #define BTRFS_FEATURE_COMPAT_RO_SUPP			\
258 	(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |	\
259 	 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
260 
261 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET	0ULL
262 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR	0ULL
263 
264 #define BTRFS_FEATURE_INCOMPAT_SUPP			\
265 	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |		\
266 	 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |	\
267 	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
268 	 BTRFS_FEATURE_INCOMPAT_BIG_METADATA |		\
269 	 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |		\
270 	 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |		\
271 	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
272 	 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
273 	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
274 	 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
275 
276 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET			\
277 	(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
278 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR		0ULL
279 
280 /*
281  * A leaf is full of items. offset and size tell us where to find
282  * the item in the leaf (relative to the start of the data area)
283  */
284 struct btrfs_item {
285 	struct btrfs_disk_key key;
286 	__le32 offset;
287 	__le32 size;
288 } __attribute__ ((__packed__));
289 
290 /*
291  * leaves have an item area and a data area:
292  * [item0, item1....itemN] [free space] [dataN...data1, data0]
293  *
294  * The data is separate from the items to get the keys closer together
295  * during searches.
296  */
297 struct btrfs_leaf {
298 	struct btrfs_header header;
299 	struct btrfs_item items[];
300 } __attribute__ ((__packed__));
301 
302 /*
303  * all non-leaf blocks are nodes, they hold only keys and pointers to
304  * other blocks
305  */
306 struct btrfs_key_ptr {
307 	struct btrfs_disk_key key;
308 	__le64 blockptr;
309 	__le64 generation;
310 } __attribute__ ((__packed__));
311 
312 struct btrfs_node {
313 	struct btrfs_header header;
314 	struct btrfs_key_ptr ptrs[];
315 } __attribute__ ((__packed__));
316 
317 /*
318  * btrfs_paths remember the path taken from the root down to the leaf.
319  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
320  * to any other levels that are present.
321  *
322  * The slots array records the index of the item or block pointer
323  * used while walking the tree.
324  */
325 enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
326 struct btrfs_path {
327 	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
328 	int slots[BTRFS_MAX_LEVEL];
329 	/* if there is real range locking, this locks field will change */
330 	u8 locks[BTRFS_MAX_LEVEL];
331 	u8 reada;
332 	/* keep some upper locks as we walk down */
333 	u8 lowest_level;
334 
335 	/*
336 	 * set by btrfs_split_item, tells search_slot to keep all locks
337 	 * and to force calls to keep space in the nodes
338 	 */
339 	unsigned int search_for_split:1;
340 	unsigned int keep_locks:1;
341 	unsigned int skip_locking:1;
342 	unsigned int leave_spinning:1;
343 	unsigned int search_commit_root:1;
344 	unsigned int need_commit_sem:1;
345 	unsigned int skip_release_on_error:1;
346 };
347 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
348 					sizeof(struct btrfs_item))
349 struct btrfs_dev_replace {
350 	u64 replace_state;	/* see #define above */
351 	time64_t time_started;	/* seconds since 1-Jan-1970 */
352 	time64_t time_stopped;	/* seconds since 1-Jan-1970 */
353 	atomic64_t num_write_errors;
354 	atomic64_t num_uncorrectable_read_errors;
355 
356 	u64 cursor_left;
357 	u64 committed_cursor_left;
358 	u64 cursor_left_last_write_of_item;
359 	u64 cursor_right;
360 
361 	u64 cont_reading_from_srcdev_mode;	/* see #define above */
362 
363 	int is_valid;
364 	int item_needs_writeback;
365 	struct btrfs_device *srcdev;
366 	struct btrfs_device *tgtdev;
367 
368 	struct mutex lock_finishing_cancel_unmount;
369 	rwlock_t lock;
370 	atomic_t read_locks;
371 	atomic_t blocking_readers;
372 	wait_queue_head_t read_lock_wq;
373 
374 	struct btrfs_scrub_progress scrub_progress;
375 };
376 
377 /* For raid type sysfs entries */
378 struct raid_kobject {
379 	u64 flags;
380 	struct kobject kobj;
381 	struct list_head list;
382 };
383 
384 struct btrfs_space_info {
385 	spinlock_t lock;
386 
387 	u64 total_bytes;	/* total bytes in the space,
388 				   this doesn't take mirrors into account */
389 	u64 bytes_used;		/* total bytes used,
390 				   this doesn't take mirrors into account */
391 	u64 bytes_pinned;	/* total bytes pinned, will be freed when the
392 				   transaction finishes */
393 	u64 bytes_reserved;	/* total bytes the allocator has reserved for
394 				   current allocations */
395 	u64 bytes_may_use;	/* number of bytes that may be used for
396 				   delalloc/allocations */
397 	u64 bytes_readonly;	/* total bytes that are read only */
398 
399 	u64 max_extent_size;	/* This will hold the maximum extent size of
400 				   the space info if we had an ENOSPC in the
401 				   allocator. */
402 
403 	unsigned int full:1;	/* indicates that we cannot allocate any more
404 				   chunks for this space */
405 	unsigned int chunk_alloc:1;	/* set if we are allocating a chunk */
406 
407 	unsigned int flush:1;		/* set if we are trying to make space */
408 
409 	unsigned int force_alloc;	/* set if we need to force a chunk
410 					   alloc for this space */
411 
412 	u64 disk_used;		/* total bytes used on disk */
413 	u64 disk_total;		/* total bytes on disk, takes mirrors into
414 				   account */
415 
416 	u64 flags;
417 
418 	/*
419 	 * bytes_pinned is kept in line with what is actually pinned, as in
420 	 * we've called update_block_group and dropped the bytes_used counter
421 	 * and increased the bytes_pinned counter.  However this means that
422 	 * bytes_pinned does not reflect the bytes that will be pinned once the
423 	 * delayed refs are flushed, so this counter is inc'ed every time we
424 	 * call btrfs_free_extent so it is a realtime count of what will be
425 	 * freed once the transaction is committed.  It will be zeroed every
426 	 * time the transaction commits.
427 	 */
428 	struct percpu_counter total_bytes_pinned;
429 
430 	struct list_head list;
431 	/* Protected by the spinlock 'lock'. */
432 	struct list_head ro_bgs;
433 	struct list_head priority_tickets;
434 	struct list_head tickets;
435 	/*
436 	 * tickets_id just indicates the next ticket will be handled, so note
437 	 * it's not stored per ticket.
438 	 */
439 	u64 tickets_id;
440 
441 	struct rw_semaphore groups_sem;
442 	/* for block groups in our same type */
443 	struct list_head block_groups[BTRFS_NR_RAID_TYPES];
444 	wait_queue_head_t wait;
445 
446 	struct kobject kobj;
447 	struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
448 };
449 
450 #define	BTRFS_BLOCK_RSV_GLOBAL		1
451 #define	BTRFS_BLOCK_RSV_DELALLOC	2
452 #define	BTRFS_BLOCK_RSV_TRANS		3
453 #define	BTRFS_BLOCK_RSV_CHUNK		4
454 #define	BTRFS_BLOCK_RSV_DELOPS		5
455 #define	BTRFS_BLOCK_RSV_EMPTY		6
456 #define	BTRFS_BLOCK_RSV_TEMP		7
457 
458 struct btrfs_block_rsv {
459 	u64 size;
460 	u64 reserved;
461 	struct btrfs_space_info *space_info;
462 	spinlock_t lock;
463 	unsigned short full;
464 	unsigned short type;
465 	unsigned short failfast;
466 
467 	/*
468 	 * Qgroup equivalent for @size @reserved
469 	 *
470 	 * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
471 	 * about things like csum size nor how many tree blocks it will need to
472 	 * reserve.
473 	 *
474 	 * Qgroup cares more about net change of the extent usage.
475 	 *
476 	 * So for one newly inserted file extent, in worst case it will cause
477 	 * leaf split and level increase, nodesize for each file extent is
478 	 * already too much.
479 	 *
480 	 * In short, qgroup_size/reserved is the upper limit of possible needed
481 	 * qgroup metadata reservation.
482 	 */
483 	u64 qgroup_rsv_size;
484 	u64 qgroup_rsv_reserved;
485 };
486 
487 /*
488  * free clusters are used to claim free space in relatively large chunks,
489  * allowing us to do less seeky writes. They are used for all metadata
490  * allocations. In ssd_spread mode they are also used for data allocations.
491  */
492 struct btrfs_free_cluster {
493 	spinlock_t lock;
494 	spinlock_t refill_lock;
495 	struct rb_root root;
496 
497 	/* largest extent in this cluster */
498 	u64 max_size;
499 
500 	/* first extent starting offset */
501 	u64 window_start;
502 
503 	/* We did a full search and couldn't create a cluster */
504 	bool fragmented;
505 
506 	struct btrfs_block_group_cache *block_group;
507 	/*
508 	 * when a cluster is allocated from a block group, we put the
509 	 * cluster onto a list in the block group so that it can
510 	 * be freed before the block group is freed.
511 	 */
512 	struct list_head block_group_list;
513 };
514 
515 enum btrfs_caching_type {
516 	BTRFS_CACHE_NO		= 0,
517 	BTRFS_CACHE_STARTED	= 1,
518 	BTRFS_CACHE_FAST	= 2,
519 	BTRFS_CACHE_FINISHED	= 3,
520 	BTRFS_CACHE_ERROR	= 4,
521 };
522 
523 enum btrfs_disk_cache_state {
524 	BTRFS_DC_WRITTEN	= 0,
525 	BTRFS_DC_ERROR		= 1,
526 	BTRFS_DC_CLEAR		= 2,
527 	BTRFS_DC_SETUP		= 3,
528 };
529 
530 struct btrfs_caching_control {
531 	struct list_head list;
532 	struct mutex mutex;
533 	wait_queue_head_t wait;
534 	struct btrfs_work work;
535 	struct btrfs_block_group_cache *block_group;
536 	u64 progress;
537 	refcount_t count;
538 };
539 
540 /* Once caching_thread() finds this much free space, it will wake up waiters. */
541 #define CACHING_CTL_WAKE_UP SZ_2M
542 
543 struct btrfs_io_ctl {
544 	void *cur, *orig;
545 	struct page *page;
546 	struct page **pages;
547 	struct btrfs_fs_info *fs_info;
548 	struct inode *inode;
549 	unsigned long size;
550 	int index;
551 	int num_pages;
552 	int entries;
553 	int bitmaps;
554 	unsigned check_crcs:1;
555 };
556 
557 /*
558  * Tree to record all locked full stripes of a RAID5/6 block group
559  */
560 struct btrfs_full_stripe_locks_tree {
561 	struct rb_root root;
562 	struct mutex lock;
563 };
564 
565 struct btrfs_block_group_cache {
566 	struct btrfs_key key;
567 	struct btrfs_block_group_item item;
568 	struct btrfs_fs_info *fs_info;
569 	struct inode *inode;
570 	spinlock_t lock;
571 	u64 pinned;
572 	u64 reserved;
573 	u64 delalloc_bytes;
574 	u64 bytes_super;
575 	u64 flags;
576 	u64 cache_generation;
577 
578 	/*
579 	 * If the free space extent count exceeds this number, convert the block
580 	 * group to bitmaps.
581 	 */
582 	u32 bitmap_high_thresh;
583 
584 	/*
585 	 * If the free space extent count drops below this number, convert the
586 	 * block group back to extents.
587 	 */
588 	u32 bitmap_low_thresh;
589 
590 	/*
591 	 * It is just used for the delayed data space allocation because
592 	 * only the data space allocation and the relative metadata update
593 	 * can be done cross the transaction.
594 	 */
595 	struct rw_semaphore data_rwsem;
596 
597 	/* for raid56, this is a full stripe, without parity */
598 	unsigned long full_stripe_len;
599 
600 	unsigned int ro;
601 	unsigned int iref:1;
602 	unsigned int has_caching_ctl:1;
603 	unsigned int removed:1;
604 
605 	int disk_cache_state;
606 
607 	/* cache tracking stuff */
608 	int cached;
609 	struct btrfs_caching_control *caching_ctl;
610 	u64 last_byte_to_unpin;
611 
612 	struct btrfs_space_info *space_info;
613 
614 	/* free space cache stuff */
615 	struct btrfs_free_space_ctl *free_space_ctl;
616 
617 	/* block group cache stuff */
618 	struct rb_node cache_node;
619 
620 	/* for block groups in the same raid type */
621 	struct list_head list;
622 
623 	/* usage count */
624 	atomic_t count;
625 
626 	/* List of struct btrfs_free_clusters for this block group.
627 	 * Today it will only have one thing on it, but that may change
628 	 */
629 	struct list_head cluster_list;
630 
631 	/* For delayed block group creation or deletion of empty block groups */
632 	struct list_head bg_list;
633 
634 	/* For read-only block groups */
635 	struct list_head ro_list;
636 
637 	atomic_t trimming;
638 
639 	/* For dirty block groups */
640 	struct list_head dirty_list;
641 	struct list_head io_list;
642 
643 	struct btrfs_io_ctl io_ctl;
644 
645 	/*
646 	 * Incremented when doing extent allocations and holding a read lock
647 	 * on the space_info's groups_sem semaphore.
648 	 * Decremented when an ordered extent that represents an IO against this
649 	 * block group's range is created (after it's added to its inode's
650 	 * root's list of ordered extents) or immediately after the allocation
651 	 * if it's a metadata extent or fallocate extent (for these cases we
652 	 * don't create ordered extents).
653 	 */
654 	atomic_t reservations;
655 
656 	/*
657 	 * Incremented while holding the spinlock *lock* by a task checking if
658 	 * it can perform a nocow write (incremented if the value for the *ro*
659 	 * field is 0). Decremented by such tasks once they create an ordered
660 	 * extent or before that if some error happens before reaching that step.
661 	 * This is to prevent races between block group relocation and nocow
662 	 * writes through direct IO.
663 	 */
664 	atomic_t nocow_writers;
665 
666 	/* Lock for free space tree operations. */
667 	struct mutex free_space_lock;
668 
669 	/*
670 	 * Does the block group need to be added to the free space tree?
671 	 * Protected by free_space_lock.
672 	 */
673 	int needs_free_space;
674 
675 	/* Record locked full stripes for RAID5/6 block group */
676 	struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
677 };
678 
679 /* delayed seq elem */
680 struct seq_list {
681 	struct list_head list;
682 	u64 seq;
683 };
684 
685 #define SEQ_LIST_INIT(name)	{ .list = LIST_HEAD_INIT((name).list), .seq = 0 }
686 
687 #define SEQ_LAST	((u64)-1)
688 
689 enum btrfs_orphan_cleanup_state {
690 	ORPHAN_CLEANUP_STARTED	= 1,
691 	ORPHAN_CLEANUP_DONE	= 2,
692 };
693 
694 /* used by the raid56 code to lock stripes for read/modify/write */
695 struct btrfs_stripe_hash {
696 	struct list_head hash_list;
697 	spinlock_t lock;
698 };
699 
700 /* used by the raid56 code to lock stripes for read/modify/write */
701 struct btrfs_stripe_hash_table {
702 	struct list_head stripe_cache;
703 	spinlock_t cache_lock;
704 	int cache_size;
705 	struct btrfs_stripe_hash table[];
706 };
707 
708 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
709 
710 void btrfs_init_async_reclaim_work(struct work_struct *work);
711 
712 /* fs_info */
713 struct reloc_control;
714 struct btrfs_device;
715 struct btrfs_fs_devices;
716 struct btrfs_balance_control;
717 struct btrfs_delayed_root;
718 
719 #define BTRFS_FS_BARRIER			1
720 #define BTRFS_FS_CLOSING_START			2
721 #define BTRFS_FS_CLOSING_DONE			3
722 #define BTRFS_FS_LOG_RECOVERING			4
723 #define BTRFS_FS_OPEN				5
724 #define BTRFS_FS_QUOTA_ENABLED			6
725 #define BTRFS_FS_UPDATE_UUID_TREE_GEN		9
726 #define BTRFS_FS_CREATING_FREE_SPACE_TREE	10
727 #define BTRFS_FS_BTREE_ERR			11
728 #define BTRFS_FS_LOG1_ERR			12
729 #define BTRFS_FS_LOG2_ERR			13
730 #define BTRFS_FS_QUOTA_OVERRIDE			14
731 /* Used to record internally whether fs has been frozen */
732 #define BTRFS_FS_FROZEN				15
733 
734 /*
735  * Indicate that a whole-filesystem exclusive operation is running
736  * (device replace, resize, device add/delete, balance)
737  */
738 #define BTRFS_FS_EXCL_OP			16
739 
740 /*
741  * To info transaction_kthread we need an immediate commit so it doesn't
742  * need to wait for commit_interval
743  */
744 #define BTRFS_FS_NEED_ASYNC_COMMIT		17
745 
746 /*
747  * Indicate that balance has been set up from the ioctl and is in the main
748  * phase. The fs_info::balance_ctl is initialized.
749  */
750 #define BTRFS_FS_BALANCE_RUNNING		18
751 
752 struct btrfs_fs_info {
753 	u8 fsid[BTRFS_FSID_SIZE];
754 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
755 	unsigned long flags;
756 	struct btrfs_root *extent_root;
757 	struct btrfs_root *tree_root;
758 	struct btrfs_root *chunk_root;
759 	struct btrfs_root *dev_root;
760 	struct btrfs_root *fs_root;
761 	struct btrfs_root *csum_root;
762 	struct btrfs_root *quota_root;
763 	struct btrfs_root *uuid_root;
764 	struct btrfs_root *free_space_root;
765 
766 	/* the log root tree is a directory of all the other log roots */
767 	struct btrfs_root *log_root_tree;
768 
769 	spinlock_t fs_roots_radix_lock;
770 	struct radix_tree_root fs_roots_radix;
771 
772 	/* block group cache stuff */
773 	spinlock_t block_group_cache_lock;
774 	u64 first_logical_byte;
775 	struct rb_root block_group_cache_tree;
776 
777 	/* keep track of unallocated space */
778 	atomic64_t free_chunk_space;
779 
780 	struct extent_io_tree freed_extents[2];
781 	struct extent_io_tree *pinned_extents;
782 
783 	/* logical->physical extent mapping */
784 	struct btrfs_mapping_tree mapping_tree;
785 
786 	/*
787 	 * block reservation for extent, checksum, root tree and
788 	 * delayed dir index item
789 	 */
790 	struct btrfs_block_rsv global_block_rsv;
791 	/* block reservation for metadata operations */
792 	struct btrfs_block_rsv trans_block_rsv;
793 	/* block reservation for chunk tree */
794 	struct btrfs_block_rsv chunk_block_rsv;
795 	/* block reservation for delayed operations */
796 	struct btrfs_block_rsv delayed_block_rsv;
797 
798 	struct btrfs_block_rsv empty_block_rsv;
799 
800 	u64 generation;
801 	u64 last_trans_committed;
802 	u64 avg_delayed_ref_runtime;
803 
804 	/*
805 	 * this is updated to the current trans every time a full commit
806 	 * is required instead of the faster short fsync log commits
807 	 */
808 	u64 last_trans_log_full_commit;
809 	unsigned long mount_opt;
810 	/*
811 	 * Track requests for actions that need to be done during transaction
812 	 * commit (like for some mount options).
813 	 */
814 	unsigned long pending_changes;
815 	unsigned long compress_type:4;
816 	unsigned int compress_level;
817 	u32 commit_interval;
818 	/*
819 	 * It is a suggestive number, the read side is safe even it gets a
820 	 * wrong number because we will write out the data into a regular
821 	 * extent. The write side(mount/remount) is under ->s_umount lock,
822 	 * so it is also safe.
823 	 */
824 	u64 max_inline;
825 
826 	struct btrfs_transaction *running_transaction;
827 	wait_queue_head_t transaction_throttle;
828 	wait_queue_head_t transaction_wait;
829 	wait_queue_head_t transaction_blocked_wait;
830 	wait_queue_head_t async_submit_wait;
831 
832 	/*
833 	 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
834 	 * when they are updated.
835 	 *
836 	 * Because we do not clear the flags for ever, so we needn't use
837 	 * the lock on the read side.
838 	 *
839 	 * We also needn't use the lock when we mount the fs, because
840 	 * there is no other task which will update the flag.
841 	 */
842 	spinlock_t super_lock;
843 	struct btrfs_super_block *super_copy;
844 	struct btrfs_super_block *super_for_commit;
845 	struct super_block *sb;
846 	struct inode *btree_inode;
847 	struct mutex tree_log_mutex;
848 	struct mutex transaction_kthread_mutex;
849 	struct mutex cleaner_mutex;
850 	struct mutex chunk_mutex;
851 
852 	/*
853 	 * this is taken to make sure we don't set block groups ro after
854 	 * the free space cache has been allocated on them
855 	 */
856 	struct mutex ro_block_group_mutex;
857 
858 	/* this is used during read/modify/write to make sure
859 	 * no two ios are trying to mod the same stripe at the same
860 	 * time
861 	 */
862 	struct btrfs_stripe_hash_table *stripe_hash_table;
863 
864 	/*
865 	 * this protects the ordered operations list only while we are
866 	 * processing all of the entries on it.  This way we make
867 	 * sure the commit code doesn't find the list temporarily empty
868 	 * because another function happens to be doing non-waiting preflush
869 	 * before jumping into the main commit.
870 	 */
871 	struct mutex ordered_operations_mutex;
872 
873 	struct rw_semaphore commit_root_sem;
874 
875 	struct rw_semaphore cleanup_work_sem;
876 
877 	struct rw_semaphore subvol_sem;
878 	struct srcu_struct subvol_srcu;
879 
880 	spinlock_t trans_lock;
881 	/*
882 	 * the reloc mutex goes with the trans lock, it is taken
883 	 * during commit to protect us from the relocation code
884 	 */
885 	struct mutex reloc_mutex;
886 
887 	struct list_head trans_list;
888 	struct list_head dead_roots;
889 	struct list_head caching_block_groups;
890 
891 	spinlock_t delayed_iput_lock;
892 	struct list_head delayed_iputs;
893 	struct mutex cleaner_delayed_iput_mutex;
894 
895 	/* this protects tree_mod_seq_list */
896 	spinlock_t tree_mod_seq_lock;
897 	atomic64_t tree_mod_seq;
898 	struct list_head tree_mod_seq_list;
899 
900 	/* this protects tree_mod_log */
901 	rwlock_t tree_mod_log_lock;
902 	struct rb_root tree_mod_log;
903 
904 	atomic_t async_delalloc_pages;
905 
906 	/*
907 	 * this is used to protect the following list -- ordered_roots.
908 	 */
909 	spinlock_t ordered_root_lock;
910 
911 	/*
912 	 * all fs/file tree roots in which there are data=ordered extents
913 	 * pending writeback are added into this list.
914 	 *
915 	 * these can span multiple transactions and basically include
916 	 * every dirty data page that isn't from nodatacow
917 	 */
918 	struct list_head ordered_roots;
919 
920 	struct mutex delalloc_root_mutex;
921 	spinlock_t delalloc_root_lock;
922 	/* all fs/file tree roots that have delalloc inodes. */
923 	struct list_head delalloc_roots;
924 
925 	/*
926 	 * there is a pool of worker threads for checksumming during writes
927 	 * and a pool for checksumming after reads.  This is because readers
928 	 * can run with FS locks held, and the writers may be waiting for
929 	 * those locks.  We don't want ordering in the pending list to cause
930 	 * deadlocks, and so the two are serviced separately.
931 	 *
932 	 * A third pool does submit_bio to avoid deadlocking with the other
933 	 * two
934 	 */
935 	struct btrfs_workqueue *workers;
936 	struct btrfs_workqueue *delalloc_workers;
937 	struct btrfs_workqueue *flush_workers;
938 	struct btrfs_workqueue *endio_workers;
939 	struct btrfs_workqueue *endio_meta_workers;
940 	struct btrfs_workqueue *endio_raid56_workers;
941 	struct btrfs_workqueue *endio_repair_workers;
942 	struct btrfs_workqueue *rmw_workers;
943 	struct btrfs_workqueue *endio_meta_write_workers;
944 	struct btrfs_workqueue *endio_write_workers;
945 	struct btrfs_workqueue *endio_freespace_worker;
946 	struct btrfs_workqueue *submit_workers;
947 	struct btrfs_workqueue *caching_workers;
948 	struct btrfs_workqueue *readahead_workers;
949 
950 	/*
951 	 * fixup workers take dirty pages that didn't properly go through
952 	 * the cow mechanism and make them safe to write.  It happens
953 	 * for the sys_munmap function call path
954 	 */
955 	struct btrfs_workqueue *fixup_workers;
956 	struct btrfs_workqueue *delayed_workers;
957 
958 	/* the extent workers do delayed refs on the extent allocation tree */
959 	struct btrfs_workqueue *extent_workers;
960 	struct task_struct *transaction_kthread;
961 	struct task_struct *cleaner_kthread;
962 	u32 thread_pool_size;
963 
964 	struct kobject *space_info_kobj;
965 	struct list_head pending_raid_kobjs;
966 	spinlock_t pending_raid_kobjs_lock; /* uncontended */
967 
968 	u64 total_pinned;
969 
970 	/* used to keep from writing metadata until there is a nice batch */
971 	struct percpu_counter dirty_metadata_bytes;
972 	struct percpu_counter delalloc_bytes;
973 	s32 dirty_metadata_batch;
974 	s32 delalloc_batch;
975 
976 	struct list_head dirty_cowonly_roots;
977 
978 	struct btrfs_fs_devices *fs_devices;
979 
980 	/*
981 	 * The space_info list is effectively read only after initial
982 	 * setup.  It is populated at mount time and cleaned up after
983 	 * all block groups are removed.  RCU is used to protect it.
984 	 */
985 	struct list_head space_info;
986 
987 	struct btrfs_space_info *data_sinfo;
988 
989 	struct reloc_control *reloc_ctl;
990 
991 	/* data_alloc_cluster is only used in ssd_spread mode */
992 	struct btrfs_free_cluster data_alloc_cluster;
993 
994 	/* all metadata allocations go through this cluster */
995 	struct btrfs_free_cluster meta_alloc_cluster;
996 
997 	/* auto defrag inodes go here */
998 	spinlock_t defrag_inodes_lock;
999 	struct rb_root defrag_inodes;
1000 	atomic_t defrag_running;
1001 
1002 	/* Used to protect avail_{data, metadata, system}_alloc_bits */
1003 	seqlock_t profiles_lock;
1004 	/*
1005 	 * these three are in extended format (availability of single
1006 	 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1007 	 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1008 	 */
1009 	u64 avail_data_alloc_bits;
1010 	u64 avail_metadata_alloc_bits;
1011 	u64 avail_system_alloc_bits;
1012 
1013 	/* restriper state */
1014 	spinlock_t balance_lock;
1015 	struct mutex balance_mutex;
1016 	atomic_t balance_pause_req;
1017 	atomic_t balance_cancel_req;
1018 	struct btrfs_balance_control *balance_ctl;
1019 	wait_queue_head_t balance_wait_q;
1020 
1021 	u32 data_chunk_allocations;
1022 	u32 metadata_ratio;
1023 
1024 	void *bdev_holder;
1025 
1026 	/* private scrub information */
1027 	struct mutex scrub_lock;
1028 	atomic_t scrubs_running;
1029 	atomic_t scrub_pause_req;
1030 	atomic_t scrubs_paused;
1031 	atomic_t scrub_cancel_req;
1032 	wait_queue_head_t scrub_pause_wait;
1033 	int scrub_workers_refcnt;
1034 	struct btrfs_workqueue *scrub_workers;
1035 	struct btrfs_workqueue *scrub_wr_completion_workers;
1036 	struct btrfs_workqueue *scrub_nocow_workers;
1037 	struct btrfs_workqueue *scrub_parity_workers;
1038 
1039 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1040 	u32 check_integrity_print_mask;
1041 #endif
1042 	/* is qgroup tracking in a consistent state? */
1043 	u64 qgroup_flags;
1044 
1045 	/* holds configuration and tracking. Protected by qgroup_lock */
1046 	struct rb_root qgroup_tree;
1047 	struct rb_root qgroup_op_tree;
1048 	spinlock_t qgroup_lock;
1049 	spinlock_t qgroup_op_lock;
1050 	atomic_t qgroup_op_seq;
1051 
1052 	/*
1053 	 * used to avoid frequently calling ulist_alloc()/ulist_free()
1054 	 * when doing qgroup accounting, it must be protected by qgroup_lock.
1055 	 */
1056 	struct ulist *qgroup_ulist;
1057 
1058 	/* protect user change for quota operations */
1059 	struct mutex qgroup_ioctl_lock;
1060 
1061 	/* list of dirty qgroups to be written at next commit */
1062 	struct list_head dirty_qgroups;
1063 
1064 	/* used by qgroup for an efficient tree traversal */
1065 	u64 qgroup_seq;
1066 
1067 	/* qgroup rescan items */
1068 	struct mutex qgroup_rescan_lock; /* protects the progress item */
1069 	struct btrfs_key qgroup_rescan_progress;
1070 	struct btrfs_workqueue *qgroup_rescan_workers;
1071 	struct completion qgroup_rescan_completion;
1072 	struct btrfs_work qgroup_rescan_work;
1073 	bool qgroup_rescan_running;	/* protected by qgroup_rescan_lock */
1074 
1075 	/* filesystem state */
1076 	unsigned long fs_state;
1077 
1078 	struct btrfs_delayed_root *delayed_root;
1079 
1080 	/* readahead tree */
1081 	spinlock_t reada_lock;
1082 	struct radix_tree_root reada_tree;
1083 
1084 	/* readahead works cnt */
1085 	atomic_t reada_works_cnt;
1086 
1087 	/* Extent buffer radix tree */
1088 	spinlock_t buffer_lock;
1089 	struct radix_tree_root buffer_radix;
1090 
1091 	/* next backup root to be overwritten */
1092 	int backup_root_index;
1093 
1094 	/* device replace state */
1095 	struct btrfs_dev_replace dev_replace;
1096 
1097 	struct percpu_counter bio_counter;
1098 	wait_queue_head_t replace_wait;
1099 
1100 	struct semaphore uuid_tree_rescan_sem;
1101 
1102 	/* Used to reclaim the metadata space in the background. */
1103 	struct work_struct async_reclaim_work;
1104 
1105 	spinlock_t unused_bgs_lock;
1106 	struct list_head unused_bgs;
1107 	struct mutex unused_bg_unpin_mutex;
1108 	struct mutex delete_unused_bgs_mutex;
1109 
1110 	/* For btrfs to record security options */
1111 	struct security_mnt_opts security_opts;
1112 
1113 	/*
1114 	 * Chunks that can't be freed yet (under a trim/discard operation)
1115 	 * and will be latter freed. Protected by fs_info->chunk_mutex.
1116 	 */
1117 	struct list_head pinned_chunks;
1118 
1119 	/* Cached block sizes */
1120 	u32 nodesize;
1121 	u32 sectorsize;
1122 	u32 stripesize;
1123 
1124 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1125 	spinlock_t ref_verify_lock;
1126 	struct rb_root block_tree;
1127 #endif
1128 };
1129 
1130 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1131 {
1132 	return sb->s_fs_info;
1133 }
1134 
1135 struct btrfs_subvolume_writers {
1136 	struct percpu_counter	counter;
1137 	wait_queue_head_t	wait;
1138 };
1139 
1140 /*
1141  * The state of btrfs root
1142  */
1143 /*
1144  * btrfs_record_root_in_trans is a multi-step process,
1145  * and it can race with the balancing code.   But the
1146  * race is very small, and only the first time the root
1147  * is added to each transaction.  So IN_TRANS_SETUP
1148  * is used to tell us when more checks are required
1149  */
1150 #define BTRFS_ROOT_IN_TRANS_SETUP	0
1151 #define BTRFS_ROOT_REF_COWS		1
1152 #define BTRFS_ROOT_TRACK_DIRTY		2
1153 #define BTRFS_ROOT_IN_RADIX		3
1154 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED	4
1155 #define BTRFS_ROOT_DEFRAG_RUNNING	5
1156 #define BTRFS_ROOT_FORCE_COW		6
1157 #define BTRFS_ROOT_MULTI_LOG_TASKS	7
1158 #define BTRFS_ROOT_DIRTY		8
1159 
1160 /*
1161  * in ram representation of the tree.  extent_root is used for all allocations
1162  * and for the extent tree extent_root root.
1163  */
1164 struct btrfs_root {
1165 	struct extent_buffer *node;
1166 
1167 	struct extent_buffer *commit_root;
1168 	struct btrfs_root *log_root;
1169 	struct btrfs_root *reloc_root;
1170 
1171 	unsigned long state;
1172 	struct btrfs_root_item root_item;
1173 	struct btrfs_key root_key;
1174 	struct btrfs_fs_info *fs_info;
1175 	struct extent_io_tree dirty_log_pages;
1176 
1177 	struct mutex objectid_mutex;
1178 
1179 	spinlock_t accounting_lock;
1180 	struct btrfs_block_rsv *block_rsv;
1181 
1182 	/* free ino cache stuff */
1183 	struct btrfs_free_space_ctl *free_ino_ctl;
1184 	enum btrfs_caching_type ino_cache_state;
1185 	spinlock_t ino_cache_lock;
1186 	wait_queue_head_t ino_cache_wait;
1187 	struct btrfs_free_space_ctl *free_ino_pinned;
1188 	u64 ino_cache_progress;
1189 	struct inode *ino_cache_inode;
1190 
1191 	struct mutex log_mutex;
1192 	wait_queue_head_t log_writer_wait;
1193 	wait_queue_head_t log_commit_wait[2];
1194 	struct list_head log_ctxs[2];
1195 	atomic_t log_writers;
1196 	atomic_t log_commit[2];
1197 	atomic_t log_batch;
1198 	int log_transid;
1199 	/* No matter the commit succeeds or not*/
1200 	int log_transid_committed;
1201 	/* Just be updated when the commit succeeds. */
1202 	int last_log_commit;
1203 	pid_t log_start_pid;
1204 
1205 	u64 objectid;
1206 	u64 last_trans;
1207 
1208 	u32 type;
1209 
1210 	u64 highest_objectid;
1211 
1212 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1213 	/* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1214 	u64 alloc_bytenr;
1215 #endif
1216 
1217 	u64 defrag_trans_start;
1218 	struct btrfs_key defrag_progress;
1219 	struct btrfs_key defrag_max;
1220 
1221 	/* the dirty list is only used by non-reference counted roots */
1222 	struct list_head dirty_list;
1223 
1224 	struct list_head root_list;
1225 
1226 	spinlock_t log_extents_lock[2];
1227 	struct list_head logged_list[2];
1228 
1229 	int orphan_cleanup_state;
1230 
1231 	spinlock_t inode_lock;
1232 	/* red-black tree that keeps track of in-memory inodes */
1233 	struct rb_root inode_tree;
1234 
1235 	/*
1236 	 * radix tree that keeps track of delayed nodes of every inode,
1237 	 * protected by inode_lock
1238 	 */
1239 	struct radix_tree_root delayed_nodes_tree;
1240 	/*
1241 	 * right now this just gets used so that a root has its own devid
1242 	 * for stat.  It may be used for more later
1243 	 */
1244 	dev_t anon_dev;
1245 
1246 	spinlock_t root_item_lock;
1247 	refcount_t refs;
1248 
1249 	struct mutex delalloc_mutex;
1250 	spinlock_t delalloc_lock;
1251 	/*
1252 	 * all of the inodes that have delalloc bytes.  It is possible for
1253 	 * this list to be empty even when there is still dirty data=ordered
1254 	 * extents waiting to finish IO.
1255 	 */
1256 	struct list_head delalloc_inodes;
1257 	struct list_head delalloc_root;
1258 	u64 nr_delalloc_inodes;
1259 
1260 	struct mutex ordered_extent_mutex;
1261 	/*
1262 	 * this is used by the balancing code to wait for all the pending
1263 	 * ordered extents
1264 	 */
1265 	spinlock_t ordered_extent_lock;
1266 
1267 	/*
1268 	 * all of the data=ordered extents pending writeback
1269 	 * these can span multiple transactions and basically include
1270 	 * every dirty data page that isn't from nodatacow
1271 	 */
1272 	struct list_head ordered_extents;
1273 	struct list_head ordered_root;
1274 	u64 nr_ordered_extents;
1275 
1276 	/*
1277 	 * Number of currently running SEND ioctls to prevent
1278 	 * manipulation with the read-only status via SUBVOL_SETFLAGS
1279 	 */
1280 	int send_in_progress;
1281 	struct btrfs_subvolume_writers *subv_writers;
1282 	atomic_t will_be_snapshotted;
1283 
1284 	/* For qgroup metadata reserved space */
1285 	spinlock_t qgroup_meta_rsv_lock;
1286 	u64 qgroup_meta_rsv_pertrans;
1287 	u64 qgroup_meta_rsv_prealloc;
1288 };
1289 
1290 struct btrfs_file_private {
1291 	void *filldir_buf;
1292 };
1293 
1294 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1295 {
1296 	return btrfs_sb(inode->i_sb)->sectorsize;
1297 }
1298 
1299 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1300 {
1301 
1302 	return info->nodesize - sizeof(struct btrfs_header);
1303 }
1304 
1305 #define BTRFS_LEAF_DATA_OFFSET		offsetof(struct btrfs_leaf, items)
1306 
1307 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1308 {
1309 	return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1310 }
1311 
1312 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1313 {
1314 	return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1315 }
1316 
1317 #define BTRFS_FILE_EXTENT_INLINE_DATA_START		\
1318 		(offsetof(struct btrfs_file_extent_item, disk_bytenr))
1319 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1320 {
1321 	return BTRFS_MAX_ITEM_SIZE(info) -
1322 	       BTRFS_FILE_EXTENT_INLINE_DATA_START;
1323 }
1324 
1325 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1326 {
1327 	return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1328 }
1329 
1330 /*
1331  * Flags for mount options.
1332  *
1333  * Note: don't forget to add new options to btrfs_show_options()
1334  */
1335 #define BTRFS_MOUNT_NODATASUM		(1 << 0)
1336 #define BTRFS_MOUNT_NODATACOW		(1 << 1)
1337 #define BTRFS_MOUNT_NOBARRIER		(1 << 2)
1338 #define BTRFS_MOUNT_SSD			(1 << 3)
1339 #define BTRFS_MOUNT_DEGRADED		(1 << 4)
1340 #define BTRFS_MOUNT_COMPRESS		(1 << 5)
1341 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1342 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1343 #define BTRFS_MOUNT_SSD_SPREAD		(1 << 8)
1344 #define BTRFS_MOUNT_NOSSD		(1 << 9)
1345 #define BTRFS_MOUNT_DISCARD		(1 << 10)
1346 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1347 #define BTRFS_MOUNT_SPACE_CACHE		(1 << 12)
1348 #define BTRFS_MOUNT_CLEAR_CACHE		(1 << 13)
1349 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1350 #define BTRFS_MOUNT_ENOSPC_DEBUG	 (1 << 15)
1351 #define BTRFS_MOUNT_AUTO_DEFRAG		(1 << 16)
1352 #define BTRFS_MOUNT_INODE_MAP_CACHE	(1 << 17)
1353 #define BTRFS_MOUNT_USEBACKUPROOT	(1 << 18)
1354 #define BTRFS_MOUNT_SKIP_BALANCE	(1 << 19)
1355 #define BTRFS_MOUNT_CHECK_INTEGRITY	(1 << 20)
1356 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1357 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	(1 << 22)
1358 #define BTRFS_MOUNT_RESCAN_UUID_TREE	(1 << 23)
1359 #define BTRFS_MOUNT_FRAGMENT_DATA	(1 << 24)
1360 #define BTRFS_MOUNT_FRAGMENT_METADATA	(1 << 25)
1361 #define BTRFS_MOUNT_FREE_SPACE_TREE	(1 << 26)
1362 #define BTRFS_MOUNT_NOLOGREPLAY		(1 << 27)
1363 #define BTRFS_MOUNT_REF_VERIFY		(1 << 28)
1364 
1365 #define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)
1366 #define BTRFS_DEFAULT_MAX_INLINE	(2048)
1367 
1368 #define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
1369 #define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
1370 #define btrfs_raw_test_opt(o, opt)	((o) & BTRFS_MOUNT_##opt)
1371 #define btrfs_test_opt(fs_info, opt)	((fs_info)->mount_opt & \
1372 					 BTRFS_MOUNT_##opt)
1373 
1374 #define btrfs_set_and_info(fs_info, opt, fmt, args...)			\
1375 {									\
1376 	if (!btrfs_test_opt(fs_info, opt))				\
1377 		btrfs_info(fs_info, fmt, ##args);			\
1378 	btrfs_set_opt(fs_info->mount_opt, opt);				\
1379 }
1380 
1381 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)		\
1382 {									\
1383 	if (btrfs_test_opt(fs_info, opt))				\
1384 		btrfs_info(fs_info, fmt, ##args);			\
1385 	btrfs_clear_opt(fs_info->mount_opt, opt);			\
1386 }
1387 
1388 #ifdef CONFIG_BTRFS_DEBUG
1389 static inline int
1390 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1391 {
1392 	struct btrfs_fs_info *fs_info = block_group->fs_info;
1393 
1394 	return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1395 		block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1396 	       (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1397 		block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1398 }
1399 #endif
1400 
1401 /*
1402  * Requests for changes that need to be done during transaction commit.
1403  *
1404  * Internal mount options that are used for special handling of the real
1405  * mount options (eg. cannot be set during remount and have to be set during
1406  * transaction commit)
1407  */
1408 
1409 #define BTRFS_PENDING_SET_INODE_MAP_CACHE	(0)
1410 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE	(1)
1411 #define BTRFS_PENDING_COMMIT			(2)
1412 
1413 #define btrfs_test_pending(info, opt)	\
1414 	test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1415 #define btrfs_set_pending(info, opt)	\
1416 	set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1417 #define btrfs_clear_pending(info, opt)	\
1418 	clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1419 
1420 /*
1421  * Helpers for setting pending mount option changes.
1422  *
1423  * Expects corresponding macros
1424  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1425  */
1426 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1427 do {                                                                   \
1428        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1429                btrfs_info((info), fmt, ##args);                        \
1430                btrfs_set_pending((info), SET_##opt);                   \
1431                btrfs_clear_pending((info), CLEAR_##opt);               \
1432        }                                                               \
1433 } while(0)
1434 
1435 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1436 do {                                                                   \
1437        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1438                btrfs_info((info), fmt, ##args);                        \
1439                btrfs_set_pending((info), CLEAR_##opt);                 \
1440                btrfs_clear_pending((info), SET_##opt);                 \
1441        }                                                               \
1442 } while(0)
1443 
1444 /*
1445  * Inode flags
1446  */
1447 #define BTRFS_INODE_NODATASUM		(1 << 0)
1448 #define BTRFS_INODE_NODATACOW		(1 << 1)
1449 #define BTRFS_INODE_READONLY		(1 << 2)
1450 #define BTRFS_INODE_NOCOMPRESS		(1 << 3)
1451 #define BTRFS_INODE_PREALLOC		(1 << 4)
1452 #define BTRFS_INODE_SYNC		(1 << 5)
1453 #define BTRFS_INODE_IMMUTABLE		(1 << 6)
1454 #define BTRFS_INODE_APPEND		(1 << 7)
1455 #define BTRFS_INODE_NODUMP		(1 << 8)
1456 #define BTRFS_INODE_NOATIME		(1 << 9)
1457 #define BTRFS_INODE_DIRSYNC		(1 << 10)
1458 #define BTRFS_INODE_COMPRESS		(1 << 11)
1459 
1460 #define BTRFS_INODE_ROOT_ITEM_INIT	(1 << 31)
1461 
1462 struct btrfs_map_token {
1463 	const struct extent_buffer *eb;
1464 	char *kaddr;
1465 	unsigned long offset;
1466 };
1467 
1468 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1469 				((bytes) >> (fs_info)->sb->s_blocksize_bits)
1470 
1471 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1472 {
1473 	token->kaddr = NULL;
1474 }
1475 
1476 /* some macros to generate set/get functions for the struct fields.  This
1477  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1478  * one for u8:
1479  */
1480 #define le8_to_cpu(v) (v)
1481 #define cpu_to_le8(v) (v)
1482 #define __le8 u8
1483 
1484 #define read_eb_member(eb, ptr, type, member, result) (\
1485 	read_extent_buffer(eb, (char *)(result),			\
1486 			   ((unsigned long)(ptr)) +			\
1487 			    offsetof(type, member),			\
1488 			   sizeof(((type *)0)->member)))
1489 
1490 #define write_eb_member(eb, ptr, type, member, result) (\
1491 	write_extent_buffer(eb, (char *)(result),			\
1492 			   ((unsigned long)(ptr)) +			\
1493 			    offsetof(type, member),			\
1494 			   sizeof(((type *)0)->member)))
1495 
1496 #define DECLARE_BTRFS_SETGET_BITS(bits)					\
1497 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,		\
1498 			       const void *ptr, unsigned long off,	\
1499 			       struct btrfs_map_token *token);		\
1500 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,	\
1501 			    unsigned long off, u##bits val,		\
1502 			    struct btrfs_map_token *token);		\
1503 static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,	\
1504 				       const void *ptr,			\
1505 				       unsigned long off)		\
1506 {									\
1507 	return btrfs_get_token_##bits(eb, ptr, off, NULL);		\
1508 }									\
1509 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
1510 				    unsigned long off, u##bits val)	\
1511 {									\
1512        btrfs_set_token_##bits(eb, ptr, off, val, NULL);			\
1513 }
1514 
1515 DECLARE_BTRFS_SETGET_BITS(8)
1516 DECLARE_BTRFS_SETGET_BITS(16)
1517 DECLARE_BTRFS_SETGET_BITS(32)
1518 DECLARE_BTRFS_SETGET_BITS(64)
1519 
1520 #define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
1521 static inline u##bits btrfs_##name(const struct extent_buffer *eb,	\
1522 				   const type *s)			\
1523 {									\
1524 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1525 	return btrfs_get_##bits(eb, s, offsetof(type, member));		\
1526 }									\
1527 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,	\
1528 				    u##bits val)			\
1529 {									\
1530 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1531 	btrfs_set_##bits(eb, s, offsetof(type, member), val);		\
1532 }									\
1533 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1534 					 const type *s,			\
1535 					 struct btrfs_map_token *token)	\
1536 {									\
1537 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1538 	return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1539 }									\
1540 static inline void btrfs_set_token_##name(struct extent_buffer *eb,	\
1541 					  type *s, u##bits val,		\
1542                                          struct btrfs_map_token *token)	\
1543 {									\
1544 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1545 	btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1546 }
1547 
1548 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
1549 static inline u##bits btrfs_##name(const struct extent_buffer *eb)	\
1550 {									\
1551 	const type *p = page_address(eb->pages[0]);			\
1552 	u##bits res = le##bits##_to_cpu(p->member);			\
1553 	return res;							\
1554 }									\
1555 static inline void btrfs_set_##name(struct extent_buffer *eb,		\
1556 				    u##bits val)			\
1557 {									\
1558 	type *p = page_address(eb->pages[0]);				\
1559 	p->member = cpu_to_le##bits(val);				\
1560 }
1561 
1562 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
1563 static inline u##bits btrfs_##name(const type *s)			\
1564 {									\
1565 	return le##bits##_to_cpu(s->member);				\
1566 }									\
1567 static inline void btrfs_set_##name(type *s, u##bits val)		\
1568 {									\
1569 	s->member = cpu_to_le##bits(val);				\
1570 }
1571 
1572 
1573 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1574 					   struct btrfs_dev_item *s)
1575 {
1576 	BUILD_BUG_ON(sizeof(u64) !=
1577 		     sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1578 	return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1579 					    total_bytes));
1580 }
1581 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1582 						struct btrfs_dev_item *s,
1583 						u64 val)
1584 {
1585 	BUILD_BUG_ON(sizeof(u64) !=
1586 		     sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1587 	WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1588 	btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1589 }
1590 
1591 
1592 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1593 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1594 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1595 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1596 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1597 		   start_offset, 64);
1598 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1599 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1600 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1601 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1602 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1603 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1604 
1605 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1606 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1607 			 total_bytes, 64);
1608 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1609 			 bytes_used, 64);
1610 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1611 			 io_align, 32);
1612 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1613 			 io_width, 32);
1614 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1615 			 sector_size, 32);
1616 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1617 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1618 			 dev_group, 32);
1619 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1620 			 seek_speed, 8);
1621 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1622 			 bandwidth, 8);
1623 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1624 			 generation, 64);
1625 
1626 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1627 {
1628 	return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1629 }
1630 
1631 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1632 {
1633 	return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1634 }
1635 
1636 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1637 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1638 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1639 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1640 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1641 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1642 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1643 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1644 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1645 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1646 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1647 
1648 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1649 {
1650 	return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1651 }
1652 
1653 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1654 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1655 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1656 			 stripe_len, 64);
1657 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1658 			 io_align, 32);
1659 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1660 			 io_width, 32);
1661 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1662 			 sector_size, 32);
1663 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1664 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1665 			 num_stripes, 16);
1666 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1667 			 sub_stripes, 16);
1668 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1669 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1670 
1671 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1672 						   int nr)
1673 {
1674 	unsigned long offset = (unsigned long)c;
1675 	offset += offsetof(struct btrfs_chunk, stripe);
1676 	offset += nr * sizeof(struct btrfs_stripe);
1677 	return (struct btrfs_stripe *)offset;
1678 }
1679 
1680 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1681 {
1682 	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1683 }
1684 
1685 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1686 					 struct btrfs_chunk *c, int nr)
1687 {
1688 	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1689 }
1690 
1691 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1692 					 struct btrfs_chunk *c, int nr)
1693 {
1694 	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1695 }
1696 
1697 /* struct btrfs_block_group_item */
1698 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1699 			 used, 64);
1700 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1701 			 used, 64);
1702 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1703 			struct btrfs_block_group_item, chunk_objectid, 64);
1704 
1705 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1706 		   struct btrfs_block_group_item, chunk_objectid, 64);
1707 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1708 		   struct btrfs_block_group_item, flags, 64);
1709 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1710 			struct btrfs_block_group_item, flags, 64);
1711 
1712 /* struct btrfs_free_space_info */
1713 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1714 		   extent_count, 32);
1715 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1716 
1717 /* struct btrfs_inode_ref */
1718 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1719 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1720 
1721 /* struct btrfs_inode_extref */
1722 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1723 		   parent_objectid, 64);
1724 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1725 		   name_len, 16);
1726 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1727 
1728 /* struct btrfs_inode_item */
1729 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1730 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1731 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1732 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1733 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1734 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1735 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1736 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1737 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1738 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1739 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1740 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1741 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1742 			 generation, 64);
1743 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1744 			 sequence, 64);
1745 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1746 			 transid, 64);
1747 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1748 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1749 			 nbytes, 64);
1750 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1751 			 block_group, 64);
1752 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1753 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1754 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1755 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1756 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1757 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1758 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1759 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1760 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1761 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1762 
1763 /* struct btrfs_dev_extent */
1764 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1765 		   chunk_tree, 64);
1766 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1767 		   chunk_objectid, 64);
1768 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1769 		   chunk_offset, 64);
1770 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1771 
1772 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1773 {
1774 	unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1775 	return (unsigned long)dev + ptr;
1776 }
1777 
1778 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1779 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1780 		   generation, 64);
1781 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1782 
1783 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1784 
1785 
1786 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1787 
1788 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1789 					struct btrfs_tree_block_info *item,
1790 					struct btrfs_disk_key *key)
1791 {
1792 	read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1793 }
1794 
1795 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1796 					    struct btrfs_tree_block_info *item,
1797 					    struct btrfs_disk_key *key)
1798 {
1799 	write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1800 }
1801 
1802 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1803 		   root, 64);
1804 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1805 		   objectid, 64);
1806 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1807 		   offset, 64);
1808 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1809 		   count, 32);
1810 
1811 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1812 		   count, 32);
1813 
1814 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1815 		   type, 8);
1816 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1817 		   offset, 64);
1818 
1819 static inline u32 btrfs_extent_inline_ref_size(int type)
1820 {
1821 	if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1822 	    type == BTRFS_SHARED_BLOCK_REF_KEY)
1823 		return sizeof(struct btrfs_extent_inline_ref);
1824 	if (type == BTRFS_SHARED_DATA_REF_KEY)
1825 		return sizeof(struct btrfs_shared_data_ref) +
1826 		       sizeof(struct btrfs_extent_inline_ref);
1827 	if (type == BTRFS_EXTENT_DATA_REF_KEY)
1828 		return sizeof(struct btrfs_extent_data_ref) +
1829 		       offsetof(struct btrfs_extent_inline_ref, offset);
1830 	return 0;
1831 }
1832 
1833 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1834 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1835 		   generation, 64);
1836 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1837 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1838 
1839 /* struct btrfs_node */
1840 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1841 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1842 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1843 			 blockptr, 64);
1844 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1845 			 generation, 64);
1846 
1847 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1848 {
1849 	unsigned long ptr;
1850 	ptr = offsetof(struct btrfs_node, ptrs) +
1851 		sizeof(struct btrfs_key_ptr) * nr;
1852 	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1853 }
1854 
1855 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1856 					   int nr, u64 val)
1857 {
1858 	unsigned long ptr;
1859 	ptr = offsetof(struct btrfs_node, ptrs) +
1860 		sizeof(struct btrfs_key_ptr) * nr;
1861 	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1862 }
1863 
1864 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1865 {
1866 	unsigned long ptr;
1867 	ptr = offsetof(struct btrfs_node, ptrs) +
1868 		sizeof(struct btrfs_key_ptr) * nr;
1869 	return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1870 }
1871 
1872 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1873 						 int nr, u64 val)
1874 {
1875 	unsigned long ptr;
1876 	ptr = offsetof(struct btrfs_node, ptrs) +
1877 		sizeof(struct btrfs_key_ptr) * nr;
1878 	btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1879 }
1880 
1881 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1882 {
1883 	return offsetof(struct btrfs_node, ptrs) +
1884 		sizeof(struct btrfs_key_ptr) * nr;
1885 }
1886 
1887 void btrfs_node_key(const struct extent_buffer *eb,
1888 		    struct btrfs_disk_key *disk_key, int nr);
1889 
1890 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1891 				      struct btrfs_disk_key *disk_key, int nr)
1892 {
1893 	unsigned long ptr;
1894 	ptr = btrfs_node_key_ptr_offset(nr);
1895 	write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1896 		       struct btrfs_key_ptr, key, disk_key);
1897 }
1898 
1899 /* struct btrfs_item */
1900 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1901 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1902 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1903 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1904 
1905 static inline unsigned long btrfs_item_nr_offset(int nr)
1906 {
1907 	return offsetof(struct btrfs_leaf, items) +
1908 		sizeof(struct btrfs_item) * nr;
1909 }
1910 
1911 static inline struct btrfs_item *btrfs_item_nr(int nr)
1912 {
1913 	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1914 }
1915 
1916 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1917 				 struct btrfs_item *item)
1918 {
1919 	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1920 }
1921 
1922 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1923 {
1924 	return btrfs_item_end(eb, btrfs_item_nr(nr));
1925 }
1926 
1927 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1928 {
1929 	return btrfs_item_offset(eb, btrfs_item_nr(nr));
1930 }
1931 
1932 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1933 {
1934 	return btrfs_item_size(eb, btrfs_item_nr(nr));
1935 }
1936 
1937 static inline void btrfs_item_key(const struct extent_buffer *eb,
1938 			   struct btrfs_disk_key *disk_key, int nr)
1939 {
1940 	struct btrfs_item *item = btrfs_item_nr(nr);
1941 	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1942 }
1943 
1944 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1945 			       struct btrfs_disk_key *disk_key, int nr)
1946 {
1947 	struct btrfs_item *item = btrfs_item_nr(nr);
1948 	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1949 }
1950 
1951 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1952 
1953 /*
1954  * struct btrfs_root_ref
1955  */
1956 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1957 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1958 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1959 
1960 /* struct btrfs_dir_item */
1961 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1962 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1963 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1964 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1965 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1966 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1967 			 data_len, 16);
1968 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1969 			 name_len, 16);
1970 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1971 			 transid, 64);
1972 
1973 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
1974 				      const struct btrfs_dir_item *item,
1975 				      struct btrfs_disk_key *key)
1976 {
1977 	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1978 }
1979 
1980 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1981 					  struct btrfs_dir_item *item,
1982 					  const struct btrfs_disk_key *key)
1983 {
1984 	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1985 }
1986 
1987 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1988 		   num_entries, 64);
1989 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1990 		   num_bitmaps, 64);
1991 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1992 		   generation, 64);
1993 
1994 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
1995 					const struct btrfs_free_space_header *h,
1996 					struct btrfs_disk_key *key)
1997 {
1998 	read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1999 }
2000 
2001 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2002 					    struct btrfs_free_space_header *h,
2003 					    const struct btrfs_disk_key *key)
2004 {
2005 	write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2006 }
2007 
2008 /* struct btrfs_disk_key */
2009 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2010 			 objectid, 64);
2011 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2012 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2013 
2014 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2015 					 const struct btrfs_disk_key *disk)
2016 {
2017 	cpu->offset = le64_to_cpu(disk->offset);
2018 	cpu->type = disk->type;
2019 	cpu->objectid = le64_to_cpu(disk->objectid);
2020 }
2021 
2022 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2023 					 const struct btrfs_key *cpu)
2024 {
2025 	disk->offset = cpu_to_le64(cpu->offset);
2026 	disk->type = cpu->type;
2027 	disk->objectid = cpu_to_le64(cpu->objectid);
2028 }
2029 
2030 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2031 					 struct btrfs_key *key, int nr)
2032 {
2033 	struct btrfs_disk_key disk_key;
2034 	btrfs_node_key(eb, &disk_key, nr);
2035 	btrfs_disk_key_to_cpu(key, &disk_key);
2036 }
2037 
2038 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2039 					 struct btrfs_key *key, int nr)
2040 {
2041 	struct btrfs_disk_key disk_key;
2042 	btrfs_item_key(eb, &disk_key, nr);
2043 	btrfs_disk_key_to_cpu(key, &disk_key);
2044 }
2045 
2046 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2047 					     const struct btrfs_dir_item *item,
2048 					     struct btrfs_key *key)
2049 {
2050 	struct btrfs_disk_key disk_key;
2051 	btrfs_dir_item_key(eb, item, &disk_key);
2052 	btrfs_disk_key_to_cpu(key, &disk_key);
2053 }
2054 
2055 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2056 {
2057 	return key->type;
2058 }
2059 
2060 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2061 {
2062 	key->type = val;
2063 }
2064 
2065 /* struct btrfs_header */
2066 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2067 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2068 			  generation, 64);
2069 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2070 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2071 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2072 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2073 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2074 			 generation, 64);
2075 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2076 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2077 			 nritems, 32);
2078 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2079 
2080 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2081 {
2082 	return (btrfs_header_flags(eb) & flag) == flag;
2083 }
2084 
2085 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2086 {
2087 	u64 flags = btrfs_header_flags(eb);
2088 	btrfs_set_header_flags(eb, flags | flag);
2089 	return (flags & flag) == flag;
2090 }
2091 
2092 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2093 {
2094 	u64 flags = btrfs_header_flags(eb);
2095 	btrfs_set_header_flags(eb, flags & ~flag);
2096 	return (flags & flag) == flag;
2097 }
2098 
2099 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2100 {
2101 	u64 flags = btrfs_header_flags(eb);
2102 	return flags >> BTRFS_BACKREF_REV_SHIFT;
2103 }
2104 
2105 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2106 						int rev)
2107 {
2108 	u64 flags = btrfs_header_flags(eb);
2109 	flags &= ~BTRFS_BACKREF_REV_MASK;
2110 	flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2111 	btrfs_set_header_flags(eb, flags);
2112 }
2113 
2114 static inline unsigned long btrfs_header_fsid(void)
2115 {
2116 	return offsetof(struct btrfs_header, fsid);
2117 }
2118 
2119 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
2120 {
2121 	return offsetof(struct btrfs_header, chunk_tree_uuid);
2122 }
2123 
2124 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2125 {
2126 	return btrfs_header_level(eb) == 0;
2127 }
2128 
2129 /* struct btrfs_root_item */
2130 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2131 		   generation, 64);
2132 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2133 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2134 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2135 
2136 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2137 			 generation, 64);
2138 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2139 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2140 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2141 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2142 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2143 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2144 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2145 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2146 			 last_snapshot, 64);
2147 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2148 			 generation_v2, 64);
2149 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2150 			 ctransid, 64);
2151 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2152 			 otransid, 64);
2153 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2154 			 stransid, 64);
2155 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2156 			 rtransid, 64);
2157 
2158 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2159 {
2160 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2161 }
2162 
2163 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2164 {
2165 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2166 }
2167 
2168 /* struct btrfs_root_backup */
2169 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2170 		   tree_root, 64);
2171 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2172 		   tree_root_gen, 64);
2173 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2174 		   tree_root_level, 8);
2175 
2176 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2177 		   chunk_root, 64);
2178 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2179 		   chunk_root_gen, 64);
2180 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2181 		   chunk_root_level, 8);
2182 
2183 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2184 		   extent_root, 64);
2185 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2186 		   extent_root_gen, 64);
2187 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2188 		   extent_root_level, 8);
2189 
2190 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2191 		   fs_root, 64);
2192 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2193 		   fs_root_gen, 64);
2194 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2195 		   fs_root_level, 8);
2196 
2197 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2198 		   dev_root, 64);
2199 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2200 		   dev_root_gen, 64);
2201 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2202 		   dev_root_level, 8);
2203 
2204 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2205 		   csum_root, 64);
2206 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2207 		   csum_root_gen, 64);
2208 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2209 		   csum_root_level, 8);
2210 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2211 		   total_bytes, 64);
2212 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2213 		   bytes_used, 64);
2214 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2215 		   num_devices, 64);
2216 
2217 /* struct btrfs_balance_item */
2218 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2219 
2220 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2221 				      const struct btrfs_balance_item *bi,
2222 				      struct btrfs_disk_balance_args *ba)
2223 {
2224 	read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2225 }
2226 
2227 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2228 				  struct btrfs_balance_item *bi,
2229 				  const struct btrfs_disk_balance_args *ba)
2230 {
2231 	write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2232 }
2233 
2234 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2235 				      const struct btrfs_balance_item *bi,
2236 				      struct btrfs_disk_balance_args *ba)
2237 {
2238 	read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2239 }
2240 
2241 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2242 				  struct btrfs_balance_item *bi,
2243 				  const struct btrfs_disk_balance_args *ba)
2244 {
2245 	write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2246 }
2247 
2248 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2249 				     const struct btrfs_balance_item *bi,
2250 				     struct btrfs_disk_balance_args *ba)
2251 {
2252 	read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2253 }
2254 
2255 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2256 				 struct btrfs_balance_item *bi,
2257 				 const struct btrfs_disk_balance_args *ba)
2258 {
2259 	write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2260 }
2261 
2262 static inline void
2263 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2264 			       const struct btrfs_disk_balance_args *disk)
2265 {
2266 	memset(cpu, 0, sizeof(*cpu));
2267 
2268 	cpu->profiles = le64_to_cpu(disk->profiles);
2269 	cpu->usage = le64_to_cpu(disk->usage);
2270 	cpu->devid = le64_to_cpu(disk->devid);
2271 	cpu->pstart = le64_to_cpu(disk->pstart);
2272 	cpu->pend = le64_to_cpu(disk->pend);
2273 	cpu->vstart = le64_to_cpu(disk->vstart);
2274 	cpu->vend = le64_to_cpu(disk->vend);
2275 	cpu->target = le64_to_cpu(disk->target);
2276 	cpu->flags = le64_to_cpu(disk->flags);
2277 	cpu->limit = le64_to_cpu(disk->limit);
2278 	cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2279 	cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2280 }
2281 
2282 static inline void
2283 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2284 			       const struct btrfs_balance_args *cpu)
2285 {
2286 	memset(disk, 0, sizeof(*disk));
2287 
2288 	disk->profiles = cpu_to_le64(cpu->profiles);
2289 	disk->usage = cpu_to_le64(cpu->usage);
2290 	disk->devid = cpu_to_le64(cpu->devid);
2291 	disk->pstart = cpu_to_le64(cpu->pstart);
2292 	disk->pend = cpu_to_le64(cpu->pend);
2293 	disk->vstart = cpu_to_le64(cpu->vstart);
2294 	disk->vend = cpu_to_le64(cpu->vend);
2295 	disk->target = cpu_to_le64(cpu->target);
2296 	disk->flags = cpu_to_le64(cpu->flags);
2297 	disk->limit = cpu_to_le64(cpu->limit);
2298 	disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2299 	disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2300 }
2301 
2302 /* struct btrfs_super_block */
2303 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2304 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2305 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2306 			 generation, 64);
2307 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2308 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2309 			 struct btrfs_super_block, sys_chunk_array_size, 32);
2310 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2311 			 struct btrfs_super_block, chunk_root_generation, 64);
2312 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2313 			 root_level, 8);
2314 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2315 			 chunk_root, 64);
2316 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2317 			 chunk_root_level, 8);
2318 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2319 			 log_root, 64);
2320 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2321 			 log_root_transid, 64);
2322 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2323 			 log_root_level, 8);
2324 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2325 			 total_bytes, 64);
2326 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2327 			 bytes_used, 64);
2328 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2329 			 sectorsize, 32);
2330 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2331 			 nodesize, 32);
2332 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2333 			 stripesize, 32);
2334 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2335 			 root_dir_objectid, 64);
2336 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2337 			 num_devices, 64);
2338 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2339 			 compat_flags, 64);
2340 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2341 			 compat_ro_flags, 64);
2342 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2343 			 incompat_flags, 64);
2344 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2345 			 csum_type, 16);
2346 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2347 			 cache_generation, 64);
2348 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2349 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2350 			 uuid_tree_generation, 64);
2351 
2352 static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
2353 {
2354 	u16 t = btrfs_super_csum_type(s);
2355 	/*
2356 	 * csum type is validated at mount time
2357 	 */
2358 	return btrfs_csum_sizes[t];
2359 }
2360 
2361 
2362 /*
2363  * The leaf data grows from end-to-front in the node.
2364  * this returns the address of the start of the last item,
2365  * which is the stop of the leaf data stack
2366  */
2367 static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
2368 					 const struct extent_buffer *leaf)
2369 {
2370 	u32 nr = btrfs_header_nritems(leaf);
2371 
2372 	if (nr == 0)
2373 		return BTRFS_LEAF_DATA_SIZE(fs_info);
2374 	return btrfs_item_offset_nr(leaf, nr - 1);
2375 }
2376 
2377 /* struct btrfs_file_extent_item */
2378 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2379 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2380 			 struct btrfs_file_extent_item, disk_bytenr, 64);
2381 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2382 			 struct btrfs_file_extent_item, offset, 64);
2383 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2384 			 struct btrfs_file_extent_item, generation, 64);
2385 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2386 			 struct btrfs_file_extent_item, num_bytes, 64);
2387 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2388 			 struct btrfs_file_extent_item, disk_num_bytes, 64);
2389 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2390 			 struct btrfs_file_extent_item, compression, 8);
2391 
2392 static inline unsigned long
2393 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2394 {
2395 	return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2396 }
2397 
2398 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2399 {
2400 	return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2401 }
2402 
2403 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2404 		   disk_bytenr, 64);
2405 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2406 		   generation, 64);
2407 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2408 		   disk_num_bytes, 64);
2409 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2410 		  offset, 64);
2411 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2412 		   num_bytes, 64);
2413 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2414 		   ram_bytes, 64);
2415 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2416 		   compression, 8);
2417 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2418 		   encryption, 8);
2419 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2420 		   other_encoding, 16);
2421 
2422 /*
2423  * this returns the number of bytes used by the item on disk, minus the
2424  * size of any extent headers.  If a file is compressed on disk, this is
2425  * the compressed size
2426  */
2427 static inline u32 btrfs_file_extent_inline_item_len(
2428 						const struct extent_buffer *eb,
2429 						struct btrfs_item *e)
2430 {
2431 	return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2432 }
2433 
2434 /* btrfs_dev_stats_item */
2435 static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
2436 					const struct btrfs_dev_stats_item *ptr,
2437 					int index)
2438 {
2439 	u64 val;
2440 
2441 	read_extent_buffer(eb, &val,
2442 			   offsetof(struct btrfs_dev_stats_item, values) +
2443 			    ((unsigned long)ptr) + (index * sizeof(u64)),
2444 			   sizeof(val));
2445 	return val;
2446 }
2447 
2448 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2449 					     struct btrfs_dev_stats_item *ptr,
2450 					     int index, u64 val)
2451 {
2452 	write_extent_buffer(eb, &val,
2453 			    offsetof(struct btrfs_dev_stats_item, values) +
2454 			     ((unsigned long)ptr) + (index * sizeof(u64)),
2455 			    sizeof(val));
2456 }
2457 
2458 /* btrfs_qgroup_status_item */
2459 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2460 		   generation, 64);
2461 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2462 		   version, 64);
2463 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2464 		   flags, 64);
2465 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2466 		   rescan, 64);
2467 
2468 /* btrfs_qgroup_info_item */
2469 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2470 		   generation, 64);
2471 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2472 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2473 		   rfer_cmpr, 64);
2474 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2475 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2476 		   excl_cmpr, 64);
2477 
2478 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2479 			 struct btrfs_qgroup_info_item, generation, 64);
2480 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2481 			 rfer, 64);
2482 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2483 			 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2484 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2485 			 excl, 64);
2486 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2487 			 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2488 
2489 /* btrfs_qgroup_limit_item */
2490 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2491 		   flags, 64);
2492 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2493 		   max_rfer, 64);
2494 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2495 		   max_excl, 64);
2496 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2497 		   rsv_rfer, 64);
2498 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2499 		   rsv_excl, 64);
2500 
2501 /* btrfs_dev_replace_item */
2502 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2503 		   struct btrfs_dev_replace_item, src_devid, 64);
2504 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2505 		   struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2506 		   64);
2507 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2508 		   replace_state, 64);
2509 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2510 		   time_started, 64);
2511 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2512 		   time_stopped, 64);
2513 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2514 		   num_write_errors, 64);
2515 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2516 		   struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2517 		   64);
2518 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2519 		   cursor_left, 64);
2520 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2521 		   cursor_right, 64);
2522 
2523 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2524 			 struct btrfs_dev_replace_item, src_devid, 64);
2525 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2526 			 struct btrfs_dev_replace_item,
2527 			 cont_reading_from_srcdev_mode, 64);
2528 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2529 			 struct btrfs_dev_replace_item, replace_state, 64);
2530 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2531 			 struct btrfs_dev_replace_item, time_started, 64);
2532 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2533 			 struct btrfs_dev_replace_item, time_stopped, 64);
2534 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2535 			 struct btrfs_dev_replace_item, num_write_errors, 64);
2536 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2537 			 struct btrfs_dev_replace_item,
2538 			 num_uncorrectable_read_errors, 64);
2539 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2540 			 struct btrfs_dev_replace_item, cursor_left, 64);
2541 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2542 			 struct btrfs_dev_replace_item, cursor_right, 64);
2543 
2544 /* helper function to cast into the data area of the leaf. */
2545 #define btrfs_item_ptr(leaf, slot, type) \
2546 	((type *)(BTRFS_LEAF_DATA_OFFSET + \
2547 	btrfs_item_offset_nr(leaf, slot)))
2548 
2549 #define btrfs_item_ptr_offset(leaf, slot) \
2550 	((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2551 	btrfs_item_offset_nr(leaf, slot)))
2552 
2553 static inline u64 btrfs_name_hash(const char *name, int len)
2554 {
2555        return crc32c((u32)~1, name, len);
2556 }
2557 
2558 /*
2559  * Figure the key offset of an extended inode ref
2560  */
2561 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2562                                    int len)
2563 {
2564        return (u64) crc32c(parent_objectid, name, len);
2565 }
2566 
2567 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2568 {
2569 	return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2570 		(space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2571 }
2572 
2573 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2574 {
2575 	return mapping_gfp_constraint(mapping, ~__GFP_FS);
2576 }
2577 
2578 /* extent-tree.c */
2579 
2580 enum btrfs_inline_ref_type {
2581 	BTRFS_REF_TYPE_INVALID =	 0,
2582 	BTRFS_REF_TYPE_BLOCK =		 1,
2583 	BTRFS_REF_TYPE_DATA =		 2,
2584 	BTRFS_REF_TYPE_ANY =		 3,
2585 };
2586 
2587 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2588 				     struct btrfs_extent_inline_ref *iref,
2589 				     enum btrfs_inline_ref_type is_data);
2590 
2591 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2592 
2593 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2594 						 unsigned num_items)
2595 {
2596 	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2597 }
2598 
2599 /*
2600  * Doing a truncate won't result in new nodes or leaves, just what we need for
2601  * COW.
2602  */
2603 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2604 						 unsigned num_items)
2605 {
2606 	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2607 }
2608 
2609 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
2610 				       struct btrfs_fs_info *fs_info);
2611 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
2612 				       struct btrfs_fs_info *fs_info);
2613 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2614 					 const u64 start);
2615 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2616 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2617 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2618 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2619 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2620 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2621 			   unsigned long count);
2622 int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2623 				 unsigned long count, u64 transid, int wait);
2624 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2625 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2626 			     struct btrfs_fs_info *fs_info, u64 bytenr,
2627 			     u64 offset, int metadata, u64 *refs, u64 *flags);
2628 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2629 		     u64 bytenr, u64 num, int reserved);
2630 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2631 				    u64 bytenr, u64 num_bytes);
2632 int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2633 				 struct extent_buffer *eb);
2634 int btrfs_cross_ref_exist(struct btrfs_root *root,
2635 			  u64 objectid, u64 offset, u64 bytenr);
2636 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2637 						 struct btrfs_fs_info *info,
2638 						 u64 bytenr);
2639 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2640 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2641 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2642 					     struct btrfs_root *root,
2643 					     u64 parent, u64 root_objectid,
2644 					     const struct btrfs_disk_key *key,
2645 					     int level, u64 hint,
2646 					     u64 empty_size);
2647 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2648 			   struct btrfs_root *root,
2649 			   struct extent_buffer *buf,
2650 			   u64 parent, int last_ref);
2651 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2652 				     struct btrfs_root *root, u64 owner,
2653 				     u64 offset, u64 ram_bytes,
2654 				     struct btrfs_key *ins);
2655 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2656 				   u64 root_objectid, u64 owner, u64 offset,
2657 				   struct btrfs_key *ins);
2658 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2659 			 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2660 			 struct btrfs_key *ins, int is_data, int delalloc);
2661 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2662 		  struct extent_buffer *buf, int full_backref);
2663 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2664 		  struct extent_buffer *buf, int full_backref);
2665 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2666 				struct btrfs_fs_info *fs_info,
2667 				u64 bytenr, u64 num_bytes, u64 flags,
2668 				int level, int is_data);
2669 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2670 		      struct btrfs_root *root,
2671 		      u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2672 		      u64 owner, u64 offset);
2673 
2674 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2675 			       u64 start, u64 len, int delalloc);
2676 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2677 				       u64 start, u64 len);
2678 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2679 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2680 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2681 			 struct btrfs_root *root,
2682 			 u64 bytenr, u64 num_bytes, u64 parent,
2683 			 u64 root_objectid, u64 owner, u64 offset);
2684 
2685 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
2686 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2687 				   struct btrfs_fs_info *fs_info);
2688 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2689 			    struct btrfs_fs_info *fs_info);
2690 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2691 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2692 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2693 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2694 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2695 			   u64 bytes_used, u64 type, u64 chunk_offset,
2696 			   u64 size);
2697 void btrfs_add_raid_kobjects(struct btrfs_fs_info *fs_info);
2698 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2699 				struct btrfs_fs_info *fs_info,
2700 				const u64 chunk_offset);
2701 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2702 			     u64 group_start, struct extent_map *em);
2703 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2704 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2705 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2706 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
2707 u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info);
2708 u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info);
2709 u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info);
2710 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2711 
2712 enum btrfs_reserve_flush_enum {
2713 	/* If we are in the transaction, we can't flush anything.*/
2714 	BTRFS_RESERVE_NO_FLUSH,
2715 	/*
2716 	 * Flushing delalloc may cause deadlock somewhere, in this
2717 	 * case, use FLUSH LIMIT
2718 	 */
2719 	BTRFS_RESERVE_FLUSH_LIMIT,
2720 	BTRFS_RESERVE_FLUSH_ALL,
2721 };
2722 
2723 enum btrfs_flush_state {
2724 	FLUSH_DELAYED_ITEMS_NR	=	1,
2725 	FLUSH_DELAYED_ITEMS	=	2,
2726 	FLUSH_DELALLOC		=	3,
2727 	FLUSH_DELALLOC_WAIT	=	4,
2728 	ALLOC_CHUNK		=	5,
2729 	COMMIT_TRANS		=	6,
2730 };
2731 
2732 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
2733 int btrfs_check_data_free_space(struct inode *inode,
2734 			struct extent_changeset **reserved, u64 start, u64 len);
2735 void btrfs_free_reserved_data_space(struct inode *inode,
2736 			struct extent_changeset *reserved, u64 start, u64 len);
2737 void btrfs_delalloc_release_space(struct inode *inode,
2738 				  struct extent_changeset *reserved,
2739 				  u64 start, u64 len, bool qgroup_free);
2740 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2741 					    u64 len);
2742 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2743 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2744 				     struct btrfs_block_rsv *rsv,
2745 				     int nitems, bool use_global_rsv);
2746 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2747 				      struct btrfs_block_rsv *rsv);
2748 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes,
2749 				    bool qgroup_free);
2750 
2751 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2752 void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes,
2753 				     bool qgroup_free);
2754 int btrfs_delalloc_reserve_space(struct inode *inode,
2755 			struct extent_changeset **reserved, u64 start, u64 len);
2756 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2757 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2758 					      unsigned short type);
2759 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
2760 				   struct btrfs_block_rsv *rsv,
2761 				   unsigned short type);
2762 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2763 			  struct btrfs_block_rsv *rsv);
2764 int btrfs_block_rsv_add(struct btrfs_root *root,
2765 			struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2766 			enum btrfs_reserve_flush_enum flush);
2767 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2768 int btrfs_block_rsv_refill(struct btrfs_root *root,
2769 			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2770 			   enum btrfs_reserve_flush_enum flush);
2771 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2772 			    struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2773 			    int update_size);
2774 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2775 			     struct btrfs_block_rsv *dest, u64 num_bytes,
2776 			     int min_factor);
2777 void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2778 			     struct btrfs_block_rsv *block_rsv,
2779 			     u64 num_bytes);
2780 int btrfs_inc_block_group_ro(struct btrfs_block_group_cache *cache);
2781 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2782 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2783 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2784 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2785 				   u64 start, u64 end);
2786 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2787 			 u64 num_bytes, u64 *actual_bytes);
2788 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type);
2789 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2790 
2791 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2792 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2793 					 struct btrfs_fs_info *fs_info);
2794 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2795 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2796 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2797 void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type);
2798 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2799 		       u64 start, u64 end);
2800 void btrfs_mark_bg_unused(struct btrfs_block_group_cache *bg);
2801 
2802 /* ctree.c */
2803 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2804 		     int level, int *slot);
2805 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2806 int btrfs_previous_item(struct btrfs_root *root,
2807 			struct btrfs_path *path, u64 min_objectid,
2808 			int type);
2809 int btrfs_previous_extent_item(struct btrfs_root *root,
2810 			struct btrfs_path *path, u64 min_objectid);
2811 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2812 			     struct btrfs_path *path,
2813 			     const struct btrfs_key *new_key);
2814 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2815 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2816 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2817 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2818 			struct btrfs_key *key, int lowest_level,
2819 			u64 min_trans);
2820 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2821 			 struct btrfs_path *path,
2822 			 u64 min_trans);
2823 enum btrfs_compare_tree_result {
2824 	BTRFS_COMPARE_TREE_NEW,
2825 	BTRFS_COMPARE_TREE_DELETED,
2826 	BTRFS_COMPARE_TREE_CHANGED,
2827 	BTRFS_COMPARE_TREE_SAME,
2828 };
2829 typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
2830 				  struct btrfs_path *right_path,
2831 				  struct btrfs_key *key,
2832 				  enum btrfs_compare_tree_result result,
2833 				  void *ctx);
2834 int btrfs_compare_trees(struct btrfs_root *left_root,
2835 			struct btrfs_root *right_root,
2836 			btrfs_changed_cb_t cb, void *ctx);
2837 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2838 		    struct btrfs_root *root, struct extent_buffer *buf,
2839 		    struct extent_buffer *parent, int parent_slot,
2840 		    struct extent_buffer **cow_ret);
2841 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2842 		      struct btrfs_root *root,
2843 		      struct extent_buffer *buf,
2844 		      struct extent_buffer **cow_ret, u64 new_root_objectid);
2845 int btrfs_block_can_be_shared(struct btrfs_root *root,
2846 			      struct extent_buffer *buf);
2847 void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2848 		       u32 data_size);
2849 void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2850 			 struct btrfs_path *path, u32 new_size, int from_end);
2851 int btrfs_split_item(struct btrfs_trans_handle *trans,
2852 		     struct btrfs_root *root,
2853 		     struct btrfs_path *path,
2854 		     const struct btrfs_key *new_key,
2855 		     unsigned long split_offset);
2856 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2857 			 struct btrfs_root *root,
2858 			 struct btrfs_path *path,
2859 			 const struct btrfs_key *new_key);
2860 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2861 		u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2862 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2863 		      const struct btrfs_key *key, struct btrfs_path *p,
2864 		      int ins_len, int cow);
2865 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2866 			  struct btrfs_path *p, u64 time_seq);
2867 int btrfs_search_slot_for_read(struct btrfs_root *root,
2868 			       const struct btrfs_key *key,
2869 			       struct btrfs_path *p, int find_higher,
2870 			       int return_any);
2871 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2872 		       struct btrfs_root *root, struct extent_buffer *parent,
2873 		       int start_slot, u64 *last_ret,
2874 		       struct btrfs_key *progress);
2875 void btrfs_release_path(struct btrfs_path *p);
2876 struct btrfs_path *btrfs_alloc_path(void);
2877 void btrfs_free_path(struct btrfs_path *p);
2878 void btrfs_set_path_blocking(struct btrfs_path *p);
2879 void btrfs_clear_path_blocking(struct btrfs_path *p,
2880 			       struct extent_buffer *held, int held_rw);
2881 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2882 
2883 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2884 		   struct btrfs_path *path, int slot, int nr);
2885 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2886 				 struct btrfs_root *root,
2887 				 struct btrfs_path *path)
2888 {
2889 	return btrfs_del_items(trans, root, path, path->slots[0], 1);
2890 }
2891 
2892 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2893 			    const struct btrfs_key *cpu_key, u32 *data_size,
2894 			    u32 total_data, u32 total_size, int nr);
2895 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2896 		      const struct btrfs_key *key, void *data, u32 data_size);
2897 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2898 			     struct btrfs_root *root,
2899 			     struct btrfs_path *path,
2900 			     const struct btrfs_key *cpu_key, u32 *data_size,
2901 			     int nr);
2902 
2903 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2904 					  struct btrfs_root *root,
2905 					  struct btrfs_path *path,
2906 					  const struct btrfs_key *key,
2907 					  u32 data_size)
2908 {
2909 	return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2910 }
2911 
2912 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2913 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2914 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2915 			u64 time_seq);
2916 static inline int btrfs_next_old_item(struct btrfs_root *root,
2917 				      struct btrfs_path *p, u64 time_seq)
2918 {
2919 	++p->slots[0];
2920 	if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2921 		return btrfs_next_old_leaf(root, p, time_seq);
2922 	return 0;
2923 }
2924 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2925 {
2926 	return btrfs_next_old_item(root, p, 0);
2927 }
2928 int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
2929 			  struct extent_buffer *leaf);
2930 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2931 				     struct btrfs_block_rsv *block_rsv,
2932 				     int update_ref, int for_reloc);
2933 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2934 			struct btrfs_root *root,
2935 			struct extent_buffer *node,
2936 			struct extent_buffer *parent);
2937 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2938 {
2939 	/*
2940 	 * Do it this way so we only ever do one test_bit in the normal case.
2941 	 */
2942 	if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2943 		if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2944 			return 2;
2945 		return 1;
2946 	}
2947 	return 0;
2948 }
2949 
2950 /*
2951  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2952  * anything except sleeping. This function is used to check the status of
2953  * the fs.
2954  */
2955 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2956 {
2957 	return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
2958 }
2959 
2960 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2961 {
2962 	kfree(fs_info->balance_ctl);
2963 	kfree(fs_info->delayed_root);
2964 	kfree(fs_info->extent_root);
2965 	kfree(fs_info->tree_root);
2966 	kfree(fs_info->chunk_root);
2967 	kfree(fs_info->dev_root);
2968 	kfree(fs_info->csum_root);
2969 	kfree(fs_info->quota_root);
2970 	kfree(fs_info->uuid_root);
2971 	kfree(fs_info->free_space_root);
2972 	kfree(fs_info->super_copy);
2973 	kfree(fs_info->super_for_commit);
2974 	security_free_mnt_opts(&fs_info->security_opts);
2975 	kvfree(fs_info);
2976 }
2977 
2978 /* tree mod log functions from ctree.c */
2979 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2980 			   struct seq_list *elem);
2981 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2982 			    struct seq_list *elem);
2983 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2984 
2985 /* root-item.c */
2986 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2987 		       u64 ref_id, u64 dirid, u64 sequence, const char *name,
2988 		       int name_len);
2989 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2990 		       u64 ref_id, u64 dirid, u64 *sequence, const char *name,
2991 		       int name_len);
2992 int btrfs_del_root(struct btrfs_trans_handle *trans,
2993 		   const struct btrfs_key *key);
2994 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2995 		      const struct btrfs_key *key,
2996 		      struct btrfs_root_item *item);
2997 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2998 				   struct btrfs_root *root,
2999 				   struct btrfs_key *key,
3000 				   struct btrfs_root_item *item);
3001 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3002 		    struct btrfs_path *path, struct btrfs_root_item *root_item,
3003 		    struct btrfs_key *root_key);
3004 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3005 void btrfs_set_root_node(struct btrfs_root_item *item,
3006 			 struct extent_buffer *node);
3007 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3008 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3009 			     struct btrfs_root *root);
3010 
3011 /* uuid-tree.c */
3012 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3013 			u64 subid);
3014 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3015 			u64 subid);
3016 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3017 			    int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3018 					      u64));
3019 
3020 /* dir-item.c */
3021 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3022 			  const char *name, int name_len);
3023 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3024 			  struct btrfs_root *root, const char *name,
3025 			  int name_len, struct btrfs_inode *dir,
3026 			  struct btrfs_key *location, u8 type, u64 index);
3027 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3028 					     struct btrfs_root *root,
3029 					     struct btrfs_path *path, u64 dir,
3030 					     const char *name, int name_len,
3031 					     int mod);
3032 struct btrfs_dir_item *
3033 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3034 			    struct btrfs_root *root,
3035 			    struct btrfs_path *path, u64 dir,
3036 			    u64 objectid, const char *name, int name_len,
3037 			    int mod);
3038 struct btrfs_dir_item *
3039 btrfs_search_dir_index_item(struct btrfs_root *root,
3040 			    struct btrfs_path *path, u64 dirid,
3041 			    const char *name, int name_len);
3042 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3043 			      struct btrfs_root *root,
3044 			      struct btrfs_path *path,
3045 			      struct btrfs_dir_item *di);
3046 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3047 			    struct btrfs_root *root,
3048 			    struct btrfs_path *path, u64 objectid,
3049 			    const char *name, u16 name_len,
3050 			    const void *data, u16 data_len);
3051 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3052 					  struct btrfs_root *root,
3053 					  struct btrfs_path *path, u64 dir,
3054 					  const char *name, u16 name_len,
3055 					  int mod);
3056 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3057 						 struct btrfs_path *path,
3058 						 const char *name,
3059 						 int name_len);
3060 
3061 /* orphan.c */
3062 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3063 			     struct btrfs_root *root, u64 offset);
3064 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3065 			  struct btrfs_root *root, u64 offset);
3066 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3067 
3068 /* inode-item.c */
3069 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3070 			   struct btrfs_root *root,
3071 			   const char *name, int name_len,
3072 			   u64 inode_objectid, u64 ref_objectid, u64 index);
3073 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3074 			   struct btrfs_root *root,
3075 			   const char *name, int name_len,
3076 			   u64 inode_objectid, u64 ref_objectid, u64 *index);
3077 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3078 			     struct btrfs_root *root,
3079 			     struct btrfs_path *path, u64 objectid);
3080 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3081 		       *root, struct btrfs_path *path,
3082 		       struct btrfs_key *location, int mod);
3083 
3084 struct btrfs_inode_extref *
3085 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3086 			  struct btrfs_root *root,
3087 			  struct btrfs_path *path,
3088 			  const char *name, int name_len,
3089 			  u64 inode_objectid, u64 ref_objectid, int ins_len,
3090 			  int cow);
3091 
3092 int btrfs_find_name_in_backref(struct extent_buffer *leaf, int slot,
3093 			       const char *name,
3094 			       int name_len, struct btrfs_inode_ref **ref_ret);
3095 int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
3096 				   u64 ref_objectid, const char *name,
3097 				   int name_len,
3098 				   struct btrfs_inode_extref **extref_ret);
3099 
3100 /* file-item.c */
3101 struct btrfs_dio_private;
3102 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3103 		    struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
3104 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3105 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3106 			      u64 logical_offset);
3107 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3108 			     struct btrfs_root *root,
3109 			     u64 objectid, u64 pos,
3110 			     u64 disk_offset, u64 disk_num_bytes,
3111 			     u64 num_bytes, u64 offset, u64 ram_bytes,
3112 			     u8 compression, u8 encryption, u16 other_encoding);
3113 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3114 			     struct btrfs_root *root,
3115 			     struct btrfs_path *path, u64 objectid,
3116 			     u64 bytenr, int mod);
3117 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3118 			   struct btrfs_root *root,
3119 			   struct btrfs_ordered_sum *sums);
3120 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3121 		       u64 file_start, int contig);
3122 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3123 			     struct list_head *list, int search_commit);
3124 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3125 				     const struct btrfs_path *path,
3126 				     struct btrfs_file_extent_item *fi,
3127 				     const bool new_inline,
3128 				     struct extent_map *em);
3129 
3130 /* inode.c */
3131 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3132 		struct page *page, size_t pg_offset, u64 start,
3133 		u64 len, int create);
3134 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3135 			      u64 *orig_start, u64 *orig_block_len,
3136 			      u64 *ram_bytes);
3137 
3138 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3139 				struct btrfs_inode *inode);
3140 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3141 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3142 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3143 		       struct btrfs_root *root,
3144 		       struct btrfs_inode *dir, struct btrfs_inode *inode,
3145 		       const char *name, int name_len);
3146 int btrfs_add_link(struct btrfs_trans_handle *trans,
3147 		   struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3148 		   const char *name, int name_len, int add_backref, u64 index);
3149 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3150 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3151 			int front);
3152 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3153 			       struct btrfs_root *root,
3154 			       struct inode *inode, u64 new_size,
3155 			       u32 min_type);
3156 
3157 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
3158 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
3159 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3160 			      unsigned int extra_bits,
3161 			      struct extent_state **cached_state, int dedupe);
3162 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3163 			     struct btrfs_root *new_root,
3164 			     struct btrfs_root *parent_root,
3165 			     u64 new_dirid);
3166 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3167 			 size_t size, struct bio *bio,
3168 			 unsigned long bio_flags);
3169 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end);
3170 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3171 int btrfs_readpage(struct file *file, struct page *page);
3172 void btrfs_evict_inode(struct inode *inode);
3173 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3174 struct inode *btrfs_alloc_inode(struct super_block *sb);
3175 void btrfs_destroy_inode(struct inode *inode);
3176 int btrfs_drop_inode(struct inode *inode);
3177 int __init btrfs_init_cachep(void);
3178 void __cold btrfs_destroy_cachep(void);
3179 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3180 			 struct btrfs_root *root, int *was_new);
3181 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3182 		struct page *page, size_t pg_offset,
3183 		u64 start, u64 end, int create);
3184 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3185 			      struct btrfs_root *root,
3186 			      struct inode *inode);
3187 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3188 				struct btrfs_root *root, struct inode *inode);
3189 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3190 		struct btrfs_inode *inode);
3191 int btrfs_orphan_cleanup(struct btrfs_root *root);
3192 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3193 void btrfs_add_delayed_iput(struct inode *inode);
3194 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3195 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3196 			      u64 start, u64 num_bytes, u64 min_size,
3197 			      loff_t actual_len, u64 *alloc_hint);
3198 int btrfs_prealloc_file_range_trans(struct inode *inode,
3199 				    struct btrfs_trans_handle *trans, int mode,
3200 				    u64 start, u64 num_bytes, u64 min_size,
3201 				    loff_t actual_len, u64 *alloc_hint);
3202 extern const struct dentry_operations btrfs_dentry_operations;
3203 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3204 void btrfs_test_inode_set_ops(struct inode *inode);
3205 #endif
3206 
3207 /* ioctl.c */
3208 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3209 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3210 int btrfs_ioctl_get_supported_features(void __user *arg);
3211 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3212 int btrfs_is_empty_uuid(u8 *uuid);
3213 int btrfs_defrag_file(struct inode *inode, struct file *file,
3214 		      struct btrfs_ioctl_defrag_range_args *range,
3215 		      u64 newer_than, unsigned long max_pages);
3216 void btrfs_get_block_group_info(struct list_head *groups_list,
3217 				struct btrfs_ioctl_space_info *space);
3218 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3219 			       struct btrfs_ioctl_balance_args *bargs);
3220 int btrfs_dedupe_file_range(struct file *src_file, loff_t src_loff,
3221 			    struct file *dst_file, loff_t dst_loff,
3222 			    u64 olen);
3223 
3224 /* file.c */
3225 int __init btrfs_auto_defrag_init(void);
3226 void __cold btrfs_auto_defrag_exit(void);
3227 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3228 			   struct btrfs_inode *inode);
3229 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3230 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3231 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3232 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3233 			     int skip_pinned);
3234 extern const struct file_operations btrfs_file_operations;
3235 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3236 			 struct btrfs_root *root, struct inode *inode,
3237 			 struct btrfs_path *path, u64 start, u64 end,
3238 			 u64 *drop_end, int drop_cache,
3239 			 int replace_extent,
3240 			 u32 extent_item_size,
3241 			 int *key_inserted);
3242 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3243 		       struct btrfs_root *root, struct inode *inode, u64 start,
3244 		       u64 end, int drop_cache);
3245 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3246 			      struct btrfs_inode *inode, u64 start, u64 end);
3247 int btrfs_release_file(struct inode *inode, struct file *file);
3248 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3249 		      size_t num_pages, loff_t pos, size_t write_bytes,
3250 		      struct extent_state **cached);
3251 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3252 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
3253 			   struct file *file_out, loff_t pos_out, u64 len);
3254 
3255 /* tree-defrag.c */
3256 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3257 			struct btrfs_root *root);
3258 
3259 /* sysfs.c */
3260 int __init btrfs_init_sysfs(void);
3261 void __cold btrfs_exit_sysfs(void);
3262 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3263 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3264 
3265 /* super.c */
3266 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3267 			unsigned long new_flags);
3268 int btrfs_sync_fs(struct super_block *sb, int wait);
3269 
3270 static inline __printf(2, 3) __cold
3271 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3272 {
3273 }
3274 
3275 #ifdef CONFIG_PRINTK
3276 __printf(2, 3)
3277 __cold
3278 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3279 #else
3280 #define btrfs_printk(fs_info, fmt, args...) \
3281 	btrfs_no_printk(fs_info, fmt, ##args)
3282 #endif
3283 
3284 #define btrfs_emerg(fs_info, fmt, args...) \
3285 	btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3286 #define btrfs_alert(fs_info, fmt, args...) \
3287 	btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3288 #define btrfs_crit(fs_info, fmt, args...) \
3289 	btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3290 #define btrfs_err(fs_info, fmt, args...) \
3291 	btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3292 #define btrfs_warn(fs_info, fmt, args...) \
3293 	btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3294 #define btrfs_notice(fs_info, fmt, args...) \
3295 	btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3296 #define btrfs_info(fs_info, fmt, args...) \
3297 	btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3298 
3299 /*
3300  * Wrappers that use printk_in_rcu
3301  */
3302 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3303 	btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3304 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3305 	btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3306 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3307 	btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3308 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3309 	btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3310 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3311 	btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3312 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3313 	btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3314 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3315 	btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3316 
3317 /*
3318  * Wrappers that use a ratelimited printk_in_rcu
3319  */
3320 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3321 	btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3322 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3323 	btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3324 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3325 	btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3326 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3327 	btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3328 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3329 	btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3330 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3331 	btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3332 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3333 	btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3334 
3335 /*
3336  * Wrappers that use a ratelimited printk
3337  */
3338 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3339 	btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3340 #define btrfs_alert_rl(fs_info, fmt, args...) \
3341 	btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3342 #define btrfs_crit_rl(fs_info, fmt, args...) \
3343 	btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3344 #define btrfs_err_rl(fs_info, fmt, args...) \
3345 	btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3346 #define btrfs_warn_rl(fs_info, fmt, args...) \
3347 	btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3348 #define btrfs_notice_rl(fs_info, fmt, args...) \
3349 	btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3350 #define btrfs_info_rl(fs_info, fmt, args...) \
3351 	btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3352 
3353 #if defined(CONFIG_DYNAMIC_DEBUG)
3354 #define btrfs_debug(fs_info, fmt, args...)				\
3355 do {									\
3356         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         	\
3357         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  	\
3358 		btrfs_printk(fs_info, KERN_DEBUG fmt, ##args);		\
3359 } while (0)
3360 #define btrfs_debug_in_rcu(fs_info, fmt, args...) 			\
3361 do {									\
3362         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); 	        \
3363         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) 		\
3364 		btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args);	\
3365 } while (0)
3366 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)			\
3367 do {									\
3368         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         	\
3369         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  	\
3370 		btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt,		\
3371 				       ##args);\
3372 } while (0)
3373 #define btrfs_debug_rl(fs_info, fmt, args...) 				\
3374 do {									\
3375         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);         	\
3376         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))  	\
3377 		btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt,	\
3378 					 ##args);			\
3379 } while (0)
3380 #elif defined(DEBUG)
3381 #define btrfs_debug(fs_info, fmt, args...) \
3382 	btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3383 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3384 	btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3385 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3386 	btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3387 #define btrfs_debug_rl(fs_info, fmt, args...) \
3388 	btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3389 #else
3390 #define btrfs_debug(fs_info, fmt, args...) \
3391 	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3392 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3393 	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3394 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3395 	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3396 #define btrfs_debug_rl(fs_info, fmt, args...) \
3397 	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3398 #endif
3399 
3400 #define btrfs_printk_in_rcu(fs_info, fmt, args...)	\
3401 do {							\
3402 	rcu_read_lock();				\
3403 	btrfs_printk(fs_info, fmt, ##args);		\
3404 	rcu_read_unlock();				\
3405 } while (0)
3406 
3407 #define btrfs_printk_ratelimited(fs_info, fmt, args...)		\
3408 do {								\
3409 	static DEFINE_RATELIMIT_STATE(_rs,			\
3410 		DEFAULT_RATELIMIT_INTERVAL,			\
3411 		DEFAULT_RATELIMIT_BURST);       		\
3412 	if (__ratelimit(&_rs))					\
3413 		btrfs_printk(fs_info, fmt, ##args);		\
3414 } while (0)
3415 
3416 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)		\
3417 do {								\
3418 	rcu_read_lock();					\
3419 	btrfs_printk_ratelimited(fs_info, fmt, ##args);		\
3420 	rcu_read_unlock();					\
3421 } while (0)
3422 
3423 #ifdef CONFIG_BTRFS_ASSERT
3424 
3425 __cold
3426 static inline void assfail(const char *expr, const char *file, int line)
3427 {
3428 	pr_err("assertion failed: %s, file: %s, line: %d\n",
3429 	       expr, file, line);
3430 	BUG();
3431 }
3432 
3433 #define ASSERT(expr)	\
3434 	(likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3435 #else
3436 #define ASSERT(expr)	((void)0)
3437 #endif
3438 
3439 __cold
3440 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3441 {
3442 	btrfs_err(fs_info,
3443 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3444 }
3445 
3446 __printf(5, 6)
3447 __cold
3448 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3449 		     unsigned int line, int errno, const char *fmt, ...);
3450 
3451 const char *btrfs_decode_error(int errno);
3452 
3453 __cold
3454 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3455 			       const char *function,
3456 			       unsigned int line, int errno);
3457 
3458 /*
3459  * Call btrfs_abort_transaction as early as possible when an error condition is
3460  * detected, that way the exact line number is reported.
3461  */
3462 #define btrfs_abort_transaction(trans, errno)		\
3463 do {								\
3464 	/* Report first abort since mount */			\
3465 	if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,	\
3466 			&((trans)->fs_info->fs_state))) {	\
3467 		if ((errno) != -EIO) {				\
3468 			WARN(1, KERN_DEBUG				\
3469 			"BTRFS: Transaction aborted (error %d)\n",	\
3470 			(errno));					\
3471 		} else {						\
3472 			btrfs_debug((trans)->fs_info,			\
3473 				    "Transaction aborted (error %d)", \
3474 				  (errno));			\
3475 		}						\
3476 	}							\
3477 	__btrfs_abort_transaction((trans), __func__,		\
3478 				  __LINE__, (errno));		\
3479 } while (0)
3480 
3481 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)		\
3482 do {								\
3483 	__btrfs_handle_fs_error((fs_info), __func__, __LINE__,	\
3484 			  (errno), fmt, ##args);		\
3485 } while (0)
3486 
3487 __printf(5, 6)
3488 __cold
3489 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3490 		   unsigned int line, int errno, const char *fmt, ...);
3491 /*
3492  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3493  * will panic().  Otherwise we BUG() here.
3494  */
3495 #define btrfs_panic(fs_info, errno, fmt, args...)			\
3496 do {									\
3497 	__btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args);	\
3498 	BUG();								\
3499 } while (0)
3500 
3501 
3502 /* compatibility and incompatibility defines */
3503 
3504 #define btrfs_set_fs_incompat(__fs_info, opt) \
3505 	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3506 
3507 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3508 					   u64 flag)
3509 {
3510 	struct btrfs_super_block *disk_super;
3511 	u64 features;
3512 
3513 	disk_super = fs_info->super_copy;
3514 	features = btrfs_super_incompat_flags(disk_super);
3515 	if (!(features & flag)) {
3516 		spin_lock(&fs_info->super_lock);
3517 		features = btrfs_super_incompat_flags(disk_super);
3518 		if (!(features & flag)) {
3519 			features |= flag;
3520 			btrfs_set_super_incompat_flags(disk_super, features);
3521 			btrfs_info(fs_info, "setting %llu feature flag",
3522 					 flag);
3523 		}
3524 		spin_unlock(&fs_info->super_lock);
3525 	}
3526 }
3527 
3528 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3529 	__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3530 
3531 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3532 					     u64 flag)
3533 {
3534 	struct btrfs_super_block *disk_super;
3535 	u64 features;
3536 
3537 	disk_super = fs_info->super_copy;
3538 	features = btrfs_super_incompat_flags(disk_super);
3539 	if (features & flag) {
3540 		spin_lock(&fs_info->super_lock);
3541 		features = btrfs_super_incompat_flags(disk_super);
3542 		if (features & flag) {
3543 			features &= ~flag;
3544 			btrfs_set_super_incompat_flags(disk_super, features);
3545 			btrfs_info(fs_info, "clearing %llu feature flag",
3546 					 flag);
3547 		}
3548 		spin_unlock(&fs_info->super_lock);
3549 	}
3550 }
3551 
3552 #define btrfs_fs_incompat(fs_info, opt) \
3553 	__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3554 
3555 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3556 {
3557 	struct btrfs_super_block *disk_super;
3558 	disk_super = fs_info->super_copy;
3559 	return !!(btrfs_super_incompat_flags(disk_super) & flag);
3560 }
3561 
3562 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3563 	__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3564 
3565 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3566 					    u64 flag)
3567 {
3568 	struct btrfs_super_block *disk_super;
3569 	u64 features;
3570 
3571 	disk_super = fs_info->super_copy;
3572 	features = btrfs_super_compat_ro_flags(disk_super);
3573 	if (!(features & flag)) {
3574 		spin_lock(&fs_info->super_lock);
3575 		features = btrfs_super_compat_ro_flags(disk_super);
3576 		if (!(features & flag)) {
3577 			features |= flag;
3578 			btrfs_set_super_compat_ro_flags(disk_super, features);
3579 			btrfs_info(fs_info, "setting %llu ro feature flag",
3580 				   flag);
3581 		}
3582 		spin_unlock(&fs_info->super_lock);
3583 	}
3584 }
3585 
3586 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3587 	__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3588 
3589 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3590 					      u64 flag)
3591 {
3592 	struct btrfs_super_block *disk_super;
3593 	u64 features;
3594 
3595 	disk_super = fs_info->super_copy;
3596 	features = btrfs_super_compat_ro_flags(disk_super);
3597 	if (features & flag) {
3598 		spin_lock(&fs_info->super_lock);
3599 		features = btrfs_super_compat_ro_flags(disk_super);
3600 		if (features & flag) {
3601 			features &= ~flag;
3602 			btrfs_set_super_compat_ro_flags(disk_super, features);
3603 			btrfs_info(fs_info, "clearing %llu ro feature flag",
3604 				   flag);
3605 		}
3606 		spin_unlock(&fs_info->super_lock);
3607 	}
3608 }
3609 
3610 #define btrfs_fs_compat_ro(fs_info, opt) \
3611 	__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3612 
3613 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3614 {
3615 	struct btrfs_super_block *disk_super;
3616 	disk_super = fs_info->super_copy;
3617 	return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3618 }
3619 
3620 /* acl.c */
3621 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3622 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3623 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3624 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3625 		   struct inode *inode, struct inode *dir);
3626 #else
3627 #define btrfs_get_acl NULL
3628 #define btrfs_set_acl NULL
3629 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3630 				 struct inode *inode, struct inode *dir)
3631 {
3632 	return 0;
3633 }
3634 #endif
3635 
3636 /* relocation.c */
3637 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3638 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3639 			  struct btrfs_root *root);
3640 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3641 			    struct btrfs_root *root);
3642 int btrfs_recover_relocation(struct btrfs_root *root);
3643 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3644 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3645 			  struct btrfs_root *root, struct extent_buffer *buf,
3646 			  struct extent_buffer *cow);
3647 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3648 			      u64 *bytes_to_reserve);
3649 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3650 			      struct btrfs_pending_snapshot *pending);
3651 
3652 /* scrub.c */
3653 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3654 		    u64 end, struct btrfs_scrub_progress *progress,
3655 		    int readonly, int is_dev_replace);
3656 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3657 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3658 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3659 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3660 			   struct btrfs_device *dev);
3661 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3662 			 struct btrfs_scrub_progress *progress);
3663 static inline void btrfs_init_full_stripe_locks_tree(
3664 			struct btrfs_full_stripe_locks_tree *locks_root)
3665 {
3666 	locks_root->root = RB_ROOT;
3667 	mutex_init(&locks_root->lock);
3668 }
3669 
3670 /* dev-replace.c */
3671 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3672 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3673 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3674 
3675 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3676 {
3677 	btrfs_bio_counter_sub(fs_info, 1);
3678 }
3679 
3680 /* reada.c */
3681 struct reada_control {
3682 	struct btrfs_fs_info	*fs_info;		/* tree to prefetch */
3683 	struct btrfs_key	key_start;
3684 	struct btrfs_key	key_end;	/* exclusive */
3685 	atomic_t		elems;
3686 	struct kref		refcnt;
3687 	wait_queue_head_t	wait;
3688 };
3689 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3690 			      struct btrfs_key *start, struct btrfs_key *end);
3691 int btrfs_reada_wait(void *handle);
3692 void btrfs_reada_detach(void *handle);
3693 int btree_readahead_hook(struct extent_buffer *eb, int err);
3694 
3695 static inline int is_fstree(u64 rootid)
3696 {
3697 	if (rootid == BTRFS_FS_TREE_OBJECTID ||
3698 	    ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3699 	      !btrfs_qgroup_level(rootid)))
3700 		return 1;
3701 	return 0;
3702 }
3703 
3704 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3705 {
3706 	return signal_pending(current);
3707 }
3708 
3709 /* Sanity test specific functions */
3710 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3711 void btrfs_test_destroy_inode(struct inode *inode);
3712 #endif
3713 
3714 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3715 {
3716 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3717 	if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
3718 			      &fs_info->fs_state)))
3719 		return 1;
3720 #endif
3721 	return 0;
3722 }
3723 
3724 static inline void cond_wake_up(struct wait_queue_head *wq)
3725 {
3726 	/*
3727 	 * This implies a full smp_mb barrier, see comments for
3728 	 * waitqueue_active why.
3729 	 */
3730 	if (wq_has_sleeper(wq))
3731 		wake_up(wq);
3732 }
3733 
3734 static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
3735 {
3736 	/*
3737 	 * Special case for conditional wakeup where the barrier required for
3738 	 * waitqueue_active is implied by some of the preceding code. Eg. one
3739 	 * of such atomic operations (atomic_dec_and_return, ...), or a
3740 	 * unlock/lock sequence, etc.
3741 	 */
3742 	if (waitqueue_active(wq))
3743 		wake_up(wq);
3744 }
3745 
3746 #endif
3747