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TOMOYO Linux Cross Reference
Linux/fs/btrfs/ctree.h

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  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 #define BTRFS_COMPAT_EXTENT_TREE_V0
 59 
 60 /*
 61  * the max metadata block size.  This limit is somewhat artificial,
 62  * but the memmove costs go through the roof for larger blocks.
 63  */
 64 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 65 
 66 /*
 67  * we can actually store much bigger names, but lets not confuse the rest
 68  * of linux
 69  */
 70 #define BTRFS_NAME_LEN 255
 71 
 72 /*
 73  * Theoretical limit is larger, but we keep this down to a sane
 74  * value. That should limit greatly the possibility of collisions on
 75  * inode ref items.
 76  */
 77 #define BTRFS_LINK_MAX 65535U
 78 
 79 /* four bytes for CRC32 */
 80 static const int btrfs_csum_sizes[] = { 4 };
 81 
 82 #define BTRFS_EMPTY_DIR_SIZE 0
 83 
 84 /* ioprio of readahead is set to idle */
 85 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
 86 
 87 #define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
 88 
 89 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
 90 
 91 
 92 /*
 93  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
 94  */
 95 static inline u32 count_max_extents(u64 size)
 96 {
 97         return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
 98 }
 99 
100 struct btrfs_mapping_tree {
101         struct extent_map_tree map_tree;
102 };
103 
104 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
105 {
106         BUG_ON(num_stripes == 0);
107         return sizeof(struct btrfs_chunk) +
108                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
109 }
110 
111 /*
112  * File system states
113  */
114 #define BTRFS_FS_STATE_ERROR            0
115 #define BTRFS_FS_STATE_REMOUNTING       1
116 #define BTRFS_FS_STATE_TRANS_ABORTED    2
117 #define BTRFS_FS_STATE_DEV_REPLACING    3
118 #define BTRFS_FS_STATE_DUMMY_FS_INFO    4
119 
120 #define BTRFS_BACKREF_REV_MAX           256
121 #define BTRFS_BACKREF_REV_SHIFT         56
122 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
123                                          BTRFS_BACKREF_REV_SHIFT)
124 
125 #define BTRFS_OLD_BACKREF_REV           0
126 #define BTRFS_MIXED_BACKREF_REV         1
127 
128 /*
129  * every tree block (leaf or node) starts with this header.
130  */
131 struct btrfs_header {
132         /* these first four must match the super block */
133         u8 csum[BTRFS_CSUM_SIZE];
134         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
135         __le64 bytenr; /* which block this node is supposed to live in */
136         __le64 flags;
137 
138         /* allowed to be different from the super from here on down */
139         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
140         __le64 generation;
141         __le64 owner;
142         __le32 nritems;
143         u8 level;
144 } __attribute__ ((__packed__));
145 
146 /*
147  * this is a very generous portion of the super block, giving us
148  * room to translate 14 chunks with 3 stripes each.
149  */
150 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
151 
152 /*
153  * just in case we somehow lose the roots and are not able to mount,
154  * we store an array of the roots from previous transactions
155  * in the super.
156  */
157 #define BTRFS_NUM_BACKUP_ROOTS 4
158 struct btrfs_root_backup {
159         __le64 tree_root;
160         __le64 tree_root_gen;
161 
162         __le64 chunk_root;
163         __le64 chunk_root_gen;
164 
165         __le64 extent_root;
166         __le64 extent_root_gen;
167 
168         __le64 fs_root;
169         __le64 fs_root_gen;
170 
171         __le64 dev_root;
172         __le64 dev_root_gen;
173 
174         __le64 csum_root;
175         __le64 csum_root_gen;
176 
177         __le64 total_bytes;
178         __le64 bytes_used;
179         __le64 num_devices;
180         /* future */
181         __le64 unused_64[4];
182 
183         u8 tree_root_level;
184         u8 chunk_root_level;
185         u8 extent_root_level;
186         u8 fs_root_level;
187         u8 dev_root_level;
188         u8 csum_root_level;
189         /* future and to align */
190         u8 unused_8[10];
191 } __attribute__ ((__packed__));
192 
193 /*
194  * the super block basically lists the main trees of the FS
195  * it currently lacks any block count etc etc
196  */
197 struct btrfs_super_block {
198         u8 csum[BTRFS_CSUM_SIZE];
199         /* the first 4 fields must match struct btrfs_header */
200         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
201         __le64 bytenr; /* this block number */
202         __le64 flags;
203 
204         /* allowed to be different from the btrfs_header from here own down */
205         __le64 magic;
206         __le64 generation;
207         __le64 root;
208         __le64 chunk_root;
209         __le64 log_root;
210 
211         /* this will help find the new super based on the log root */
212         __le64 log_root_transid;
213         __le64 total_bytes;
214         __le64 bytes_used;
215         __le64 root_dir_objectid;
216         __le64 num_devices;
217         __le32 sectorsize;
218         __le32 nodesize;
219         __le32 __unused_leafsize;
220         __le32 stripesize;
221         __le32 sys_chunk_array_size;
222         __le64 chunk_root_generation;
223         __le64 compat_flags;
224         __le64 compat_ro_flags;
225         __le64 incompat_flags;
226         __le16 csum_type;
227         u8 root_level;
228         u8 chunk_root_level;
229         u8 log_root_level;
230         struct btrfs_dev_item dev_item;
231 
232         char label[BTRFS_LABEL_SIZE];
233 
234         __le64 cache_generation;
235         __le64 uuid_tree_generation;
236 
237         /* future expansion */
238         __le64 reserved[30];
239         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
240         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
241 } __attribute__ ((__packed__));
242 
243 /*
244  * Compat flags that we support.  If any incompat flags are set other than the
245  * ones specified below then we will fail to mount
246  */
247 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
248 #define BTRFS_FEATURE_COMPAT_SAFE_SET           0ULL
249 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR         0ULL
250 
251 #define BTRFS_FEATURE_COMPAT_RO_SUPP                    \
252         (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |      \
253          BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
254 
255 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET        0ULL
256 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR      0ULL
257 
258 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
259         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
260          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
261          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
262          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
263          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
264          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
265          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
266          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
267          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
268          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
269 
270 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                 \
271         (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
272 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR               0ULL
273 
274 /*
275  * A leaf is full of items. offset and size tell us where to find
276  * the item in the leaf (relative to the start of the data area)
277  */
278 struct btrfs_item {
279         struct btrfs_disk_key key;
280         __le32 offset;
281         __le32 size;
282 } __attribute__ ((__packed__));
283 
284 /*
285  * leaves have an item area and a data area:
286  * [item0, item1....itemN] [free space] [dataN...data1, data0]
287  *
288  * The data is separate from the items to get the keys closer together
289  * during searches.
290  */
291 struct btrfs_leaf {
292         struct btrfs_header header;
293         struct btrfs_item items[];
294 } __attribute__ ((__packed__));
295 
296 /*
297  * all non-leaf blocks are nodes, they hold only keys and pointers to
298  * other blocks
299  */
300 struct btrfs_key_ptr {
301         struct btrfs_disk_key key;
302         __le64 blockptr;
303         __le64 generation;
304 } __attribute__ ((__packed__));
305 
306 struct btrfs_node {
307         struct btrfs_header header;
308         struct btrfs_key_ptr ptrs[];
309 } __attribute__ ((__packed__));
310 
311 /*
312  * btrfs_paths remember the path taken from the root down to the leaf.
313  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
314  * to any other levels that are present.
315  *
316  * The slots array records the index of the item or block pointer
317  * used while walking the tree.
318  */
319 enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
320 struct btrfs_path {
321         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
322         int slots[BTRFS_MAX_LEVEL];
323         /* if there is real range locking, this locks field will change */
324         u8 locks[BTRFS_MAX_LEVEL];
325         u8 reada;
326         /* keep some upper locks as we walk down */
327         u8 lowest_level;
328 
329         /*
330          * set by btrfs_split_item, tells search_slot to keep all locks
331          * and to force calls to keep space in the nodes
332          */
333         unsigned int search_for_split:1;
334         unsigned int keep_locks:1;
335         unsigned int skip_locking:1;
336         unsigned int leave_spinning:1;
337         unsigned int search_commit_root:1;
338         unsigned int need_commit_sem:1;
339         unsigned int skip_release_on_error:1;
340 };
341 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
342                                         sizeof(struct btrfs_item))
343 struct btrfs_dev_replace {
344         u64 replace_state;      /* see #define above */
345         u64 time_started;       /* seconds since 1-Jan-1970 */
346         u64 time_stopped;       /* seconds since 1-Jan-1970 */
347         atomic64_t num_write_errors;
348         atomic64_t num_uncorrectable_read_errors;
349 
350         u64 cursor_left;
351         u64 committed_cursor_left;
352         u64 cursor_left_last_write_of_item;
353         u64 cursor_right;
354 
355         u64 cont_reading_from_srcdev_mode;      /* see #define above */
356 
357         int is_valid;
358         int item_needs_writeback;
359         struct btrfs_device *srcdev;
360         struct btrfs_device *tgtdev;
361 
362         pid_t lock_owner;
363         atomic_t nesting_level;
364         struct mutex lock_finishing_cancel_unmount;
365         rwlock_t lock;
366         atomic_t read_locks;
367         atomic_t blocking_readers;
368         wait_queue_head_t read_lock_wq;
369 
370         struct btrfs_scrub_progress scrub_progress;
371 };
372 
373 /* For raid type sysfs entries */
374 struct raid_kobject {
375         u64 flags;
376         struct kobject kobj;
377         struct list_head list;
378 };
379 
380 struct btrfs_space_info {
381         spinlock_t lock;
382 
383         u64 total_bytes;        /* total bytes in the space,
384                                    this doesn't take mirrors into account */
385         u64 bytes_used;         /* total bytes used,
386                                    this doesn't take mirrors into account */
387         u64 bytes_pinned;       /* total bytes pinned, will be freed when the
388                                    transaction finishes */
389         u64 bytes_reserved;     /* total bytes the allocator has reserved for
390                                    current allocations */
391         u64 bytes_may_use;      /* number of bytes that may be used for
392                                    delalloc/allocations */
393         u64 bytes_readonly;     /* total bytes that are read only */
394 
395         u64 max_extent_size;    /* This will hold the maximum extent size of
396                                    the space info if we had an ENOSPC in the
397                                    allocator. */
398 
399         unsigned int full:1;    /* indicates that we cannot allocate any more
400                                    chunks for this space */
401         unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
402 
403         unsigned int flush:1;           /* set if we are trying to make space */
404 
405         unsigned int force_alloc;       /* set if we need to force a chunk
406                                            alloc for this space */
407 
408         u64 disk_used;          /* total bytes used on disk */
409         u64 disk_total;         /* total bytes on disk, takes mirrors into
410                                    account */
411 
412         u64 flags;
413 
414         /*
415          * bytes_pinned is kept in line with what is actually pinned, as in
416          * we've called update_block_group and dropped the bytes_used counter
417          * and increased the bytes_pinned counter.  However this means that
418          * bytes_pinned does not reflect the bytes that will be pinned once the
419          * delayed refs are flushed, so this counter is inc'ed every time we
420          * call btrfs_free_extent so it is a realtime count of what will be
421          * freed once the transaction is committed.  It will be zeroed every
422          * time the transaction commits.
423          */
424         struct percpu_counter total_bytes_pinned;
425 
426         struct list_head list;
427         /* Protected by the spinlock 'lock'. */
428         struct list_head ro_bgs;
429         struct list_head priority_tickets;
430         struct list_head tickets;
431         /*
432          * tickets_id just indicates the next ticket will be handled, so note
433          * it's not stored per ticket.
434          */
435         u64 tickets_id;
436 
437         struct rw_semaphore groups_sem;
438         /* for block groups in our same type */
439         struct list_head block_groups[BTRFS_NR_RAID_TYPES];
440         wait_queue_head_t wait;
441 
442         struct kobject kobj;
443         struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
444 };
445 
446 #define BTRFS_BLOCK_RSV_GLOBAL          1
447 #define BTRFS_BLOCK_RSV_DELALLOC        2
448 #define BTRFS_BLOCK_RSV_TRANS           3
449 #define BTRFS_BLOCK_RSV_CHUNK           4
450 #define BTRFS_BLOCK_RSV_DELOPS          5
451 #define BTRFS_BLOCK_RSV_EMPTY           6
452 #define BTRFS_BLOCK_RSV_TEMP            7
453 
454 struct btrfs_block_rsv {
455         u64 size;
456         u64 reserved;
457         struct btrfs_space_info *space_info;
458         spinlock_t lock;
459         unsigned short full;
460         unsigned short type;
461         unsigned short failfast;
462 
463         /*
464          * Qgroup equivalent for @size @reserved
465          *
466          * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
467          * about things like csum size nor how many tree blocks it will need to
468          * reserve.
469          *
470          * Qgroup cares more about net change of the extent usage.
471          *
472          * So for one newly inserted file extent, in worst case it will cause
473          * leaf split and level increase, nodesize for each file extent is
474          * already too much.
475          *
476          * In short, qgroup_size/reserved is the upper limit of possible needed
477          * qgroup metadata reservation.
478          */
479         u64 qgroup_rsv_size;
480         u64 qgroup_rsv_reserved;
481 };
482 
483 /*
484  * free clusters are used to claim free space in relatively large chunks,
485  * allowing us to do less seeky writes. They are used for all metadata
486  * allocations. In ssd_spread mode they are also used for data allocations.
487  */
488 struct btrfs_free_cluster {
489         spinlock_t lock;
490         spinlock_t refill_lock;
491         struct rb_root root;
492 
493         /* largest extent in this cluster */
494         u64 max_size;
495 
496         /* first extent starting offset */
497         u64 window_start;
498 
499         /* We did a full search and couldn't create a cluster */
500         bool fragmented;
501 
502         struct btrfs_block_group_cache *block_group;
503         /*
504          * when a cluster is allocated from a block group, we put the
505          * cluster onto a list in the block group so that it can
506          * be freed before the block group is freed.
507          */
508         struct list_head block_group_list;
509 };
510 
511 enum btrfs_caching_type {
512         BTRFS_CACHE_NO          = 0,
513         BTRFS_CACHE_STARTED     = 1,
514         BTRFS_CACHE_FAST        = 2,
515         BTRFS_CACHE_FINISHED    = 3,
516         BTRFS_CACHE_ERROR       = 4,
517 };
518 
519 enum btrfs_disk_cache_state {
520         BTRFS_DC_WRITTEN        = 0,
521         BTRFS_DC_ERROR          = 1,
522         BTRFS_DC_CLEAR          = 2,
523         BTRFS_DC_SETUP          = 3,
524 };
525 
526 struct btrfs_caching_control {
527         struct list_head list;
528         struct mutex mutex;
529         wait_queue_head_t wait;
530         struct btrfs_work work;
531         struct btrfs_block_group_cache *block_group;
532         u64 progress;
533         refcount_t count;
534 };
535 
536 /* Once caching_thread() finds this much free space, it will wake up waiters. */
537 #define CACHING_CTL_WAKE_UP SZ_2M
538 
539 struct btrfs_io_ctl {
540         void *cur, *orig;
541         struct page *page;
542         struct page **pages;
543         struct btrfs_fs_info *fs_info;
544         struct inode *inode;
545         unsigned long size;
546         int index;
547         int num_pages;
548         int entries;
549         int bitmaps;
550         unsigned check_crcs:1;
551 };
552 
553 /*
554  * Tree to record all locked full stripes of a RAID5/6 block group
555  */
556 struct btrfs_full_stripe_locks_tree {
557         struct rb_root root;
558         struct mutex lock;
559 };
560 
561 struct btrfs_block_group_cache {
562         struct btrfs_key key;
563         struct btrfs_block_group_item item;
564         struct btrfs_fs_info *fs_info;
565         struct inode *inode;
566         spinlock_t lock;
567         u64 pinned;
568         u64 reserved;
569         u64 delalloc_bytes;
570         u64 bytes_super;
571         u64 flags;
572         u64 cache_generation;
573 
574         /*
575          * If the free space extent count exceeds this number, convert the block
576          * group to bitmaps.
577          */
578         u32 bitmap_high_thresh;
579 
580         /*
581          * If the free space extent count drops below this number, convert the
582          * block group back to extents.
583          */
584         u32 bitmap_low_thresh;
585 
586         /*
587          * It is just used for the delayed data space allocation because
588          * only the data space allocation and the relative metadata update
589          * can be done cross the transaction.
590          */
591         struct rw_semaphore data_rwsem;
592 
593         /* for raid56, this is a full stripe, without parity */
594         unsigned long full_stripe_len;
595 
596         unsigned int ro;
597         unsigned int iref:1;
598         unsigned int has_caching_ctl:1;
599         unsigned int removed:1;
600 
601         int disk_cache_state;
602 
603         /* cache tracking stuff */
604         int cached;
605         struct btrfs_caching_control *caching_ctl;
606         u64 last_byte_to_unpin;
607 
608         struct btrfs_space_info *space_info;
609 
610         /* free space cache stuff */
611         struct btrfs_free_space_ctl *free_space_ctl;
612 
613         /* block group cache stuff */
614         struct rb_node cache_node;
615 
616         /* for block groups in the same raid type */
617         struct list_head list;
618 
619         /* usage count */
620         atomic_t count;
621 
622         /* List of struct btrfs_free_clusters for this block group.
623          * Today it will only have one thing on it, but that may change
624          */
625         struct list_head cluster_list;
626 
627         /* For delayed block group creation or deletion of empty block groups */
628         struct list_head bg_list;
629 
630         /* For read-only block groups */
631         struct list_head ro_list;
632 
633         atomic_t trimming;
634 
635         /* For dirty block groups */
636         struct list_head dirty_list;
637         struct list_head io_list;
638 
639         struct btrfs_io_ctl io_ctl;
640 
641         /*
642          * Incremented when doing extent allocations and holding a read lock
643          * on the space_info's groups_sem semaphore.
644          * Decremented when an ordered extent that represents an IO against this
645          * block group's range is created (after it's added to its inode's
646          * root's list of ordered extents) or immediately after the allocation
647          * if it's a metadata extent or fallocate extent (for these cases we
648          * don't create ordered extents).
649          */
650         atomic_t reservations;
651 
652         /*
653          * Incremented while holding the spinlock *lock* by a task checking if
654          * it can perform a nocow write (incremented if the value for the *ro*
655          * field is 0). Decremented by such tasks once they create an ordered
656          * extent or before that if some error happens before reaching that step.
657          * This is to prevent races between block group relocation and nocow
658          * writes through direct IO.
659          */
660         atomic_t nocow_writers;
661 
662         /* Lock for free space tree operations. */
663         struct mutex free_space_lock;
664 
665         /*
666          * Does the block group need to be added to the free space tree?
667          * Protected by free_space_lock.
668          */
669         int needs_free_space;
670 
671         /* Record locked full stripes for RAID5/6 block group */
672         struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
673 };
674 
675 /* delayed seq elem */
676 struct seq_list {
677         struct list_head list;
678         u64 seq;
679 };
680 
681 #define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
682 
683 #define SEQ_LAST        ((u64)-1)
684 
685 enum btrfs_orphan_cleanup_state {
686         ORPHAN_CLEANUP_STARTED  = 1,
687         ORPHAN_CLEANUP_DONE     = 2,
688 };
689 
690 /* used by the raid56 code to lock stripes for read/modify/write */
691 struct btrfs_stripe_hash {
692         struct list_head hash_list;
693         spinlock_t lock;
694 };
695 
696 /* used by the raid56 code to lock stripes for read/modify/write */
697 struct btrfs_stripe_hash_table {
698         struct list_head stripe_cache;
699         spinlock_t cache_lock;
700         int cache_size;
701         struct btrfs_stripe_hash table[];
702 };
703 
704 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
705 
706 void btrfs_init_async_reclaim_work(struct work_struct *work);
707 
708 /* fs_info */
709 struct reloc_control;
710 struct btrfs_device;
711 struct btrfs_fs_devices;
712 struct btrfs_balance_control;
713 struct btrfs_delayed_root;
714 
715 #define BTRFS_FS_BARRIER                        1
716 #define BTRFS_FS_CLOSING_START                  2
717 #define BTRFS_FS_CLOSING_DONE                   3
718 #define BTRFS_FS_LOG_RECOVERING                 4
719 #define BTRFS_FS_OPEN                           5
720 #define BTRFS_FS_QUOTA_ENABLED                  6
721 #define BTRFS_FS_UPDATE_UUID_TREE_GEN           9
722 #define BTRFS_FS_CREATING_FREE_SPACE_TREE       10
723 #define BTRFS_FS_BTREE_ERR                      11
724 #define BTRFS_FS_LOG1_ERR                       12
725 #define BTRFS_FS_LOG2_ERR                       13
726 #define BTRFS_FS_QUOTA_OVERRIDE                 14
727 /* Used to record internally whether fs has been frozen */
728 #define BTRFS_FS_FROZEN                         15
729 
730 /*
731  * Indicate that a whole-filesystem exclusive operation is running
732  * (device replace, resize, device add/delete, balance)
733  */
734 #define BTRFS_FS_EXCL_OP                        16
735 
736 /*
737  * To info transaction_kthread we need an immediate commit so it doesn't
738  * need to wait for commit_interval
739  */
740 #define BTRFS_FS_NEED_ASYNC_COMMIT              17
741 
742 struct btrfs_fs_info {
743         u8 fsid[BTRFS_FSID_SIZE];
744         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
745         unsigned long flags;
746         struct btrfs_root *extent_root;
747         struct btrfs_root *tree_root;
748         struct btrfs_root *chunk_root;
749         struct btrfs_root *dev_root;
750         struct btrfs_root *fs_root;
751         struct btrfs_root *csum_root;
752         struct btrfs_root *quota_root;
753         struct btrfs_root *uuid_root;
754         struct btrfs_root *free_space_root;
755 
756         /* the log root tree is a directory of all the other log roots */
757         struct btrfs_root *log_root_tree;
758 
759         spinlock_t fs_roots_radix_lock;
760         struct radix_tree_root fs_roots_radix;
761 
762         /* block group cache stuff */
763         spinlock_t block_group_cache_lock;
764         u64 first_logical_byte;
765         struct rb_root block_group_cache_tree;
766 
767         /* keep track of unallocated space */
768         atomic64_t free_chunk_space;
769 
770         struct extent_io_tree freed_extents[2];
771         struct extent_io_tree *pinned_extents;
772 
773         /* logical->physical extent mapping */
774         struct btrfs_mapping_tree mapping_tree;
775 
776         /*
777          * block reservation for extent, checksum, root tree and
778          * delayed dir index item
779          */
780         struct btrfs_block_rsv global_block_rsv;
781         /* block reservation for metadata operations */
782         struct btrfs_block_rsv trans_block_rsv;
783         /* block reservation for chunk tree */
784         struct btrfs_block_rsv chunk_block_rsv;
785         /* block reservation for delayed operations */
786         struct btrfs_block_rsv delayed_block_rsv;
787 
788         struct btrfs_block_rsv empty_block_rsv;
789 
790         u64 generation;
791         u64 last_trans_committed;
792         u64 avg_delayed_ref_runtime;
793 
794         /*
795          * this is updated to the current trans every time a full commit
796          * is required instead of the faster short fsync log commits
797          */
798         u64 last_trans_log_full_commit;
799         unsigned long mount_opt;
800         /*
801          * Track requests for actions that need to be done during transaction
802          * commit (like for some mount options).
803          */
804         unsigned long pending_changes;
805         unsigned long compress_type:4;
806         unsigned int compress_level;
807         u32 commit_interval;
808         /*
809          * It is a suggestive number, the read side is safe even it gets a
810          * wrong number because we will write out the data into a regular
811          * extent. The write side(mount/remount) is under ->s_umount lock,
812          * so it is also safe.
813          */
814         u64 max_inline;
815 
816         struct btrfs_transaction *running_transaction;
817         wait_queue_head_t transaction_throttle;
818         wait_queue_head_t transaction_wait;
819         wait_queue_head_t transaction_blocked_wait;
820         wait_queue_head_t async_submit_wait;
821 
822         /*
823          * Used to protect the incompat_flags, compat_flags, compat_ro_flags
824          * when they are updated.
825          *
826          * Because we do not clear the flags for ever, so we needn't use
827          * the lock on the read side.
828          *
829          * We also needn't use the lock when we mount the fs, because
830          * there is no other task which will update the flag.
831          */
832         spinlock_t super_lock;
833         struct btrfs_super_block *super_copy;
834         struct btrfs_super_block *super_for_commit;
835         struct super_block *sb;
836         struct inode *btree_inode;
837         struct mutex tree_log_mutex;
838         struct mutex transaction_kthread_mutex;
839         struct mutex cleaner_mutex;
840         struct mutex chunk_mutex;
841         struct mutex volume_mutex;
842 
843         /*
844          * this is taken to make sure we don't set block groups ro after
845          * the free space cache has been allocated on them
846          */
847         struct mutex ro_block_group_mutex;
848 
849         /* this is used during read/modify/write to make sure
850          * no two ios are trying to mod the same stripe at the same
851          * time
852          */
853         struct btrfs_stripe_hash_table *stripe_hash_table;
854 
855         /*
856          * this protects the ordered operations list only while we are
857          * processing all of the entries on it.  This way we make
858          * sure the commit code doesn't find the list temporarily empty
859          * because another function happens to be doing non-waiting preflush
860          * before jumping into the main commit.
861          */
862         struct mutex ordered_operations_mutex;
863 
864         struct rw_semaphore commit_root_sem;
865 
866         struct rw_semaphore cleanup_work_sem;
867 
868         struct rw_semaphore subvol_sem;
869         struct srcu_struct subvol_srcu;
870 
871         spinlock_t trans_lock;
872         /*
873          * the reloc mutex goes with the trans lock, it is taken
874          * during commit to protect us from the relocation code
875          */
876         struct mutex reloc_mutex;
877 
878         struct list_head trans_list;
879         struct list_head dead_roots;
880         struct list_head caching_block_groups;
881 
882         spinlock_t delayed_iput_lock;
883         struct list_head delayed_iputs;
884         struct mutex cleaner_delayed_iput_mutex;
885 
886         /* this protects tree_mod_seq_list */
887         spinlock_t tree_mod_seq_lock;
888         atomic64_t tree_mod_seq;
889         struct list_head tree_mod_seq_list;
890 
891         /* this protects tree_mod_log */
892         rwlock_t tree_mod_log_lock;
893         struct rb_root tree_mod_log;
894 
895         atomic_t async_delalloc_pages;
896 
897         /*
898          * this is used to protect the following list -- ordered_roots.
899          */
900         spinlock_t ordered_root_lock;
901 
902         /*
903          * all fs/file tree roots in which there are data=ordered extents
904          * pending writeback are added into this list.
905          *
906          * these can span multiple transactions and basically include
907          * every dirty data page that isn't from nodatacow
908          */
909         struct list_head ordered_roots;
910 
911         struct mutex delalloc_root_mutex;
912         spinlock_t delalloc_root_lock;
913         /* all fs/file tree roots that have delalloc inodes. */
914         struct list_head delalloc_roots;
915 
916         /*
917          * there is a pool of worker threads for checksumming during writes
918          * and a pool for checksumming after reads.  This is because readers
919          * can run with FS locks held, and the writers may be waiting for
920          * those locks.  We don't want ordering in the pending list to cause
921          * deadlocks, and so the two are serviced separately.
922          *
923          * A third pool does submit_bio to avoid deadlocking with the other
924          * two
925          */
926         struct btrfs_workqueue *workers;
927         struct btrfs_workqueue *delalloc_workers;
928         struct btrfs_workqueue *flush_workers;
929         struct btrfs_workqueue *endio_workers;
930         struct btrfs_workqueue *endio_meta_workers;
931         struct btrfs_workqueue *endio_raid56_workers;
932         struct btrfs_workqueue *endio_repair_workers;
933         struct btrfs_workqueue *rmw_workers;
934         struct btrfs_workqueue *endio_meta_write_workers;
935         struct btrfs_workqueue *endio_write_workers;
936         struct btrfs_workqueue *endio_freespace_worker;
937         struct btrfs_workqueue *submit_workers;
938         struct btrfs_workqueue *caching_workers;
939         struct btrfs_workqueue *readahead_workers;
940 
941         /*
942          * fixup workers take dirty pages that didn't properly go through
943          * the cow mechanism and make them safe to write.  It happens
944          * for the sys_munmap function call path
945          */
946         struct btrfs_workqueue *fixup_workers;
947         struct btrfs_workqueue *delayed_workers;
948 
949         /* the extent workers do delayed refs on the extent allocation tree */
950         struct btrfs_workqueue *extent_workers;
951         struct task_struct *transaction_kthread;
952         struct task_struct *cleaner_kthread;
953         u32 thread_pool_size;
954 
955         struct kobject *space_info_kobj;
956         struct list_head pending_raid_kobjs;
957         spinlock_t pending_raid_kobjs_lock; /* uncontended */
958 
959         u64 total_pinned;
960 
961         /* used to keep from writing metadata until there is a nice batch */
962         struct percpu_counter dirty_metadata_bytes;
963         struct percpu_counter delalloc_bytes;
964         s32 dirty_metadata_batch;
965         s32 delalloc_batch;
966 
967         struct list_head dirty_cowonly_roots;
968 
969         struct btrfs_fs_devices *fs_devices;
970 
971         /*
972          * The space_info list is effectively read only after initial
973          * setup.  It is populated at mount time and cleaned up after
974          * all block groups are removed.  RCU is used to protect it.
975          */
976         struct list_head space_info;
977 
978         struct btrfs_space_info *data_sinfo;
979 
980         struct reloc_control *reloc_ctl;
981 
982         /* data_alloc_cluster is only used in ssd_spread mode */
983         struct btrfs_free_cluster data_alloc_cluster;
984 
985         /* all metadata allocations go through this cluster */
986         struct btrfs_free_cluster meta_alloc_cluster;
987 
988         /* auto defrag inodes go here */
989         spinlock_t defrag_inodes_lock;
990         struct rb_root defrag_inodes;
991         atomic_t defrag_running;
992 
993         /* Used to protect avail_{data, metadata, system}_alloc_bits */
994         seqlock_t profiles_lock;
995         /*
996          * these three are in extended format (availability of single
997          * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
998          * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
999          */
1000         u64 avail_data_alloc_bits;
1001         u64 avail_metadata_alloc_bits;
1002         u64 avail_system_alloc_bits;
1003 
1004         /* restriper state */
1005         spinlock_t balance_lock;
1006         struct mutex balance_mutex;
1007         atomic_t balance_running;
1008         atomic_t balance_pause_req;
1009         atomic_t balance_cancel_req;
1010         struct btrfs_balance_control *balance_ctl;
1011         wait_queue_head_t balance_wait_q;
1012 
1013         u32 data_chunk_allocations;
1014         u32 metadata_ratio;
1015 
1016         void *bdev_holder;
1017 
1018         /* private scrub information */
1019         struct mutex scrub_lock;
1020         atomic_t scrubs_running;
1021         atomic_t scrub_pause_req;
1022         atomic_t scrubs_paused;
1023         atomic_t scrub_cancel_req;
1024         wait_queue_head_t scrub_pause_wait;
1025         int scrub_workers_refcnt;
1026         struct btrfs_workqueue *scrub_workers;
1027         struct btrfs_workqueue *scrub_wr_completion_workers;
1028         struct btrfs_workqueue *scrub_nocow_workers;
1029         struct btrfs_workqueue *scrub_parity_workers;
1030 
1031 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1032         u32 check_integrity_print_mask;
1033 #endif
1034         /* is qgroup tracking in a consistent state? */
1035         u64 qgroup_flags;
1036 
1037         /* holds configuration and tracking. Protected by qgroup_lock */
1038         struct rb_root qgroup_tree;
1039         struct rb_root qgroup_op_tree;
1040         spinlock_t qgroup_lock;
1041         spinlock_t qgroup_op_lock;
1042         atomic_t qgroup_op_seq;
1043 
1044         /*
1045          * used to avoid frequently calling ulist_alloc()/ulist_free()
1046          * when doing qgroup accounting, it must be protected by qgroup_lock.
1047          */
1048         struct ulist *qgroup_ulist;
1049 
1050         /* protect user change for quota operations */
1051         struct mutex qgroup_ioctl_lock;
1052 
1053         /* list of dirty qgroups to be written at next commit */
1054         struct list_head dirty_qgroups;
1055 
1056         /* used by qgroup for an efficient tree traversal */
1057         u64 qgroup_seq;
1058 
1059         /* qgroup rescan items */
1060         struct mutex qgroup_rescan_lock; /* protects the progress item */
1061         struct btrfs_key qgroup_rescan_progress;
1062         struct btrfs_workqueue *qgroup_rescan_workers;
1063         struct completion qgroup_rescan_completion;
1064         struct btrfs_work qgroup_rescan_work;
1065         bool qgroup_rescan_running;     /* protected by qgroup_rescan_lock */
1066 
1067         /* filesystem state */
1068         unsigned long fs_state;
1069 
1070         struct btrfs_delayed_root *delayed_root;
1071 
1072         /* readahead tree */
1073         spinlock_t reada_lock;
1074         struct radix_tree_root reada_tree;
1075 
1076         /* readahead works cnt */
1077         atomic_t reada_works_cnt;
1078 
1079         /* Extent buffer radix tree */
1080         spinlock_t buffer_lock;
1081         struct radix_tree_root buffer_radix;
1082 
1083         /* next backup root to be overwritten */
1084         int backup_root_index;
1085 
1086         /* device replace state */
1087         struct btrfs_dev_replace dev_replace;
1088 
1089         struct percpu_counter bio_counter;
1090         wait_queue_head_t replace_wait;
1091 
1092         struct semaphore uuid_tree_rescan_sem;
1093 
1094         /* Used to reclaim the metadata space in the background. */
1095         struct work_struct async_reclaim_work;
1096 
1097         spinlock_t unused_bgs_lock;
1098         struct list_head unused_bgs;
1099         struct mutex unused_bg_unpin_mutex;
1100         struct mutex delete_unused_bgs_mutex;
1101 
1102         /* For btrfs to record security options */
1103         struct security_mnt_opts security_opts;
1104 
1105         /*
1106          * Chunks that can't be freed yet (under a trim/discard operation)
1107          * and will be latter freed. Protected by fs_info->chunk_mutex.
1108          */
1109         struct list_head pinned_chunks;
1110 
1111         /* Cached block sizes */
1112         u32 nodesize;
1113         u32 sectorsize;
1114         u32 stripesize;
1115 
1116 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1117         spinlock_t ref_verify_lock;
1118         struct rb_root block_tree;
1119 #endif
1120 };
1121 
1122 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1123 {
1124         return sb->s_fs_info;
1125 }
1126 
1127 struct btrfs_subvolume_writers {
1128         struct percpu_counter   counter;
1129         wait_queue_head_t       wait;
1130 };
1131 
1132 /*
1133  * The state of btrfs root
1134  */
1135 /*
1136  * btrfs_record_root_in_trans is a multi-step process,
1137  * and it can race with the balancing code.   But the
1138  * race is very small, and only the first time the root
1139  * is added to each transaction.  So IN_TRANS_SETUP
1140  * is used to tell us when more checks are required
1141  */
1142 #define BTRFS_ROOT_IN_TRANS_SETUP       0
1143 #define BTRFS_ROOT_REF_COWS             1
1144 #define BTRFS_ROOT_TRACK_DIRTY          2
1145 #define BTRFS_ROOT_IN_RADIX             3
1146 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 4
1147 #define BTRFS_ROOT_DEFRAG_RUNNING       5
1148 #define BTRFS_ROOT_FORCE_COW            6
1149 #define BTRFS_ROOT_MULTI_LOG_TASKS      7
1150 #define BTRFS_ROOT_DIRTY                8
1151 
1152 /*
1153  * in ram representation of the tree.  extent_root is used for all allocations
1154  * and for the extent tree extent_root root.
1155  */
1156 struct btrfs_root {
1157         struct extent_buffer *node;
1158 
1159         struct extent_buffer *commit_root;
1160         struct btrfs_root *log_root;
1161         struct btrfs_root *reloc_root;
1162 
1163         unsigned long state;
1164         struct btrfs_root_item root_item;
1165         struct btrfs_key root_key;
1166         struct btrfs_fs_info *fs_info;
1167         struct extent_io_tree dirty_log_pages;
1168 
1169         struct mutex objectid_mutex;
1170 
1171         spinlock_t accounting_lock;
1172         struct btrfs_block_rsv *block_rsv;
1173 
1174         /* free ino cache stuff */
1175         struct btrfs_free_space_ctl *free_ino_ctl;
1176         enum btrfs_caching_type ino_cache_state;
1177         spinlock_t ino_cache_lock;
1178         wait_queue_head_t ino_cache_wait;
1179         struct btrfs_free_space_ctl *free_ino_pinned;
1180         u64 ino_cache_progress;
1181         struct inode *ino_cache_inode;
1182 
1183         struct mutex log_mutex;
1184         wait_queue_head_t log_writer_wait;
1185         wait_queue_head_t log_commit_wait[2];
1186         struct list_head log_ctxs[2];
1187         atomic_t log_writers;
1188         atomic_t log_commit[2];
1189         atomic_t log_batch;
1190         int log_transid;
1191         /* No matter the commit succeeds or not*/
1192         int log_transid_committed;
1193         /* Just be updated when the commit succeeds. */
1194         int last_log_commit;
1195         pid_t log_start_pid;
1196 
1197         u64 objectid;
1198         u64 last_trans;
1199 
1200         u32 type;
1201 
1202         u64 highest_objectid;
1203 
1204 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1205         /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1206         u64 alloc_bytenr;
1207 #endif
1208 
1209         u64 defrag_trans_start;
1210         struct btrfs_key defrag_progress;
1211         struct btrfs_key defrag_max;
1212         char *name;
1213 
1214         /* the dirty list is only used by non-reference counted roots */
1215         struct list_head dirty_list;
1216 
1217         struct list_head root_list;
1218 
1219         spinlock_t log_extents_lock[2];
1220         struct list_head logged_list[2];
1221 
1222         spinlock_t orphan_lock;
1223         atomic_t orphan_inodes;
1224         struct btrfs_block_rsv *orphan_block_rsv;
1225         int orphan_cleanup_state;
1226 
1227         spinlock_t inode_lock;
1228         /* red-black tree that keeps track of in-memory inodes */
1229         struct rb_root inode_tree;
1230 
1231         /*
1232          * radix tree that keeps track of delayed nodes of every inode,
1233          * protected by inode_lock
1234          */
1235         struct radix_tree_root delayed_nodes_tree;
1236         /*
1237          * right now this just gets used so that a root has its own devid
1238          * for stat.  It may be used for more later
1239          */
1240         dev_t anon_dev;
1241 
1242         spinlock_t root_item_lock;
1243         refcount_t refs;
1244 
1245         struct mutex delalloc_mutex;
1246         spinlock_t delalloc_lock;
1247         /*
1248          * all of the inodes that have delalloc bytes.  It is possible for
1249          * this list to be empty even when there is still dirty data=ordered
1250          * extents waiting to finish IO.
1251          */
1252         struct list_head delalloc_inodes;
1253         struct list_head delalloc_root;
1254         u64 nr_delalloc_inodes;
1255 
1256         struct mutex ordered_extent_mutex;
1257         /*
1258          * this is used by the balancing code to wait for all the pending
1259          * ordered extents
1260          */
1261         spinlock_t ordered_extent_lock;
1262 
1263         /*
1264          * all of the data=ordered extents pending writeback
1265          * these can span multiple transactions and basically include
1266          * every dirty data page that isn't from nodatacow
1267          */
1268         struct list_head ordered_extents;
1269         struct list_head ordered_root;
1270         u64 nr_ordered_extents;
1271 
1272         /*
1273          * Number of currently running SEND ioctls to prevent
1274          * manipulation with the read-only status via SUBVOL_SETFLAGS
1275          */
1276         int send_in_progress;
1277         struct btrfs_subvolume_writers *subv_writers;
1278         atomic_t will_be_snapshotted;
1279 
1280         /* For qgroup metadata reserved space */
1281         spinlock_t qgroup_meta_rsv_lock;
1282         u64 qgroup_meta_rsv_pertrans;
1283         u64 qgroup_meta_rsv_prealloc;
1284 };
1285 
1286 struct btrfs_file_private {
1287         void *filldir_buf;
1288 };
1289 
1290 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1291 {
1292         return btrfs_sb(inode->i_sb)->sectorsize;
1293 }
1294 
1295 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1296 {
1297 
1298         return info->nodesize - sizeof(struct btrfs_header);
1299 }
1300 
1301 #define BTRFS_LEAF_DATA_OFFSET          offsetof(struct btrfs_leaf, items)
1302 
1303 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1304 {
1305         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1306 }
1307 
1308 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1309 {
1310         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1311 }
1312 
1313 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1314                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1315 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1316 {
1317         return BTRFS_MAX_ITEM_SIZE(info) -
1318                BTRFS_FILE_EXTENT_INLINE_DATA_START;
1319 }
1320 
1321 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1322 {
1323         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1324 }
1325 
1326 /*
1327  * Flags for mount options.
1328  *
1329  * Note: don't forget to add new options to btrfs_show_options()
1330  */
1331 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
1332 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
1333 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1334 #define BTRFS_MOUNT_SSD                 (1 << 3)
1335 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
1336 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
1337 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1338 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1339 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1340 #define BTRFS_MOUNT_NOSSD               (1 << 9)
1341 #define BTRFS_MOUNT_DISCARD             (1 << 10)
1342 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1343 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1344 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1345 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1346 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1347 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1348 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1349 #define BTRFS_MOUNT_USEBACKUPROOT       (1 << 18)
1350 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1351 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1352 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1353 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1354 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
1355 #define BTRFS_MOUNT_FRAGMENT_DATA       (1 << 24)
1356 #define BTRFS_MOUNT_FRAGMENT_METADATA   (1 << 25)
1357 #define BTRFS_MOUNT_FREE_SPACE_TREE     (1 << 26)
1358 #define BTRFS_MOUNT_NOLOGREPLAY         (1 << 27)
1359 #define BTRFS_MOUNT_REF_VERIFY          (1 << 28)
1360 
1361 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
1362 #define BTRFS_DEFAULT_MAX_INLINE        (2048)
1363 
1364 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1365 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1366 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
1367 #define btrfs_test_opt(fs_info, opt)    ((fs_info)->mount_opt & \
1368                                          BTRFS_MOUNT_##opt)
1369 
1370 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                  \
1371 {                                                                       \
1372         if (!btrfs_test_opt(fs_info, opt))                              \
1373                 btrfs_info(fs_info, fmt, ##args);                       \
1374         btrfs_set_opt(fs_info->mount_opt, opt);                         \
1375 }
1376 
1377 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)                \
1378 {                                                                       \
1379         if (btrfs_test_opt(fs_info, opt))                               \
1380                 btrfs_info(fs_info, fmt, ##args);                       \
1381         btrfs_clear_opt(fs_info->mount_opt, opt);                       \
1382 }
1383 
1384 #ifdef CONFIG_BTRFS_DEBUG
1385 static inline int
1386 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1387 {
1388         struct btrfs_fs_info *fs_info = block_group->fs_info;
1389 
1390         return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1391                 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1392                (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1393                 block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1394 }
1395 #endif
1396 
1397 /*
1398  * Requests for changes that need to be done during transaction commit.
1399  *
1400  * Internal mount options that are used for special handling of the real
1401  * mount options (eg. cannot be set during remount and have to be set during
1402  * transaction commit)
1403  */
1404 
1405 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
1406 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
1407 #define BTRFS_PENDING_COMMIT                    (2)
1408 
1409 #define btrfs_test_pending(info, opt)   \
1410         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1411 #define btrfs_set_pending(info, opt)    \
1412         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1413 #define btrfs_clear_pending(info, opt)  \
1414         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1415 
1416 /*
1417  * Helpers for setting pending mount option changes.
1418  *
1419  * Expects corresponding macros
1420  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1421  */
1422 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1423 do {                                                                   \
1424        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1425                btrfs_info((info), fmt, ##args);                        \
1426                btrfs_set_pending((info), SET_##opt);                   \
1427                btrfs_clear_pending((info), CLEAR_##opt);               \
1428        }                                                               \
1429 } while(0)
1430 
1431 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1432 do {                                                                   \
1433        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1434                btrfs_info((info), fmt, ##args);                        \
1435                btrfs_set_pending((info), CLEAR_##opt);                 \
1436                btrfs_clear_pending((info), SET_##opt);                 \
1437        }                                                               \
1438 } while(0)
1439 
1440 /*
1441  * Inode flags
1442  */
1443 #define BTRFS_INODE_NODATASUM           (1 << 0)
1444 #define BTRFS_INODE_NODATACOW           (1 << 1)
1445 #define BTRFS_INODE_READONLY            (1 << 2)
1446 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1447 #define BTRFS_INODE_PREALLOC            (1 << 4)
1448 #define BTRFS_INODE_SYNC                (1 << 5)
1449 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1450 #define BTRFS_INODE_APPEND              (1 << 7)
1451 #define BTRFS_INODE_NODUMP              (1 << 8)
1452 #define BTRFS_INODE_NOATIME             (1 << 9)
1453 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1454 #define BTRFS_INODE_COMPRESS            (1 << 11)
1455 
1456 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1457 
1458 struct btrfs_map_token {
1459         const struct extent_buffer *eb;
1460         char *kaddr;
1461         unsigned long offset;
1462 };
1463 
1464 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1465                                 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1466 
1467 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1468 {
1469         token->kaddr = NULL;
1470 }
1471 
1472 /* some macros to generate set/get functions for the struct fields.  This
1473  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1474  * one for u8:
1475  */
1476 #define le8_to_cpu(v) (v)
1477 #define cpu_to_le8(v) (v)
1478 #define __le8 u8
1479 
1480 #define read_eb_member(eb, ptr, type, member, result) (\
1481         read_extent_buffer(eb, (char *)(result),                        \
1482                            ((unsigned long)(ptr)) +                     \
1483                             offsetof(type, member),                     \
1484                            sizeof(((type *)0)->member)))
1485 
1486 #define write_eb_member(eb, ptr, type, member, result) (\
1487         write_extent_buffer(eb, (char *)(result),                       \
1488                            ((unsigned long)(ptr)) +                     \
1489                             offsetof(type, member),                     \
1490                            sizeof(((type *)0)->member)))
1491 
1492 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1493 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,          \
1494                                const void *ptr, unsigned long off,      \
1495                                struct btrfs_map_token *token);          \
1496 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,  \
1497                             unsigned long off, u##bits val,             \
1498                             struct btrfs_map_token *token);             \
1499 static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,  \
1500                                        const void *ptr,                 \
1501                                        unsigned long off)               \
1502 {                                                                       \
1503         return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
1504 }                                                                       \
1505 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
1506                                     unsigned long off, u##bits val)     \
1507 {                                                                       \
1508        btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
1509 }
1510 
1511 DECLARE_BTRFS_SETGET_BITS(8)
1512 DECLARE_BTRFS_SETGET_BITS(16)
1513 DECLARE_BTRFS_SETGET_BITS(32)
1514 DECLARE_BTRFS_SETGET_BITS(64)
1515 
1516 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1517 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1518                                    const type *s)                       \
1519 {                                                                       \
1520         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1521         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1522 }                                                                       \
1523 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1524                                     u##bits val)                        \
1525 {                                                                       \
1526         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1527         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1528 }                                                                       \
1529 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1530                                          const type *s,                 \
1531                                          struct btrfs_map_token *token) \
1532 {                                                                       \
1533         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1534         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1535 }                                                                       \
1536 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1537                                           type *s, u##bits val,         \
1538                                          struct btrfs_map_token *token) \
1539 {                                                                       \
1540         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1541         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1542 }
1543 
1544 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1545 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1546 {                                                                       \
1547         const type *p = page_address(eb->pages[0]);                     \
1548         u##bits res = le##bits##_to_cpu(p->member);                     \
1549         return res;                                                     \
1550 }                                                                       \
1551 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1552                                     u##bits val)                        \
1553 {                                                                       \
1554         type *p = page_address(eb->pages[0]);                           \
1555         p->member = cpu_to_le##bits(val);                               \
1556 }
1557 
1558 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1559 static inline u##bits btrfs_##name(const type *s)                       \
1560 {                                                                       \
1561         return le##bits##_to_cpu(s->member);                            \
1562 }                                                                       \
1563 static inline void btrfs_set_##name(type *s, u##bits val)               \
1564 {                                                                       \
1565         s->member = cpu_to_le##bits(val);                               \
1566 }
1567 
1568 
1569 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1570                                            struct btrfs_dev_item *s)
1571 {
1572         BUILD_BUG_ON(sizeof(u64) !=
1573                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1574         return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1575                                             total_bytes));
1576 }
1577 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1578                                                 struct btrfs_dev_item *s,
1579                                                 u64 val)
1580 {
1581         BUILD_BUG_ON(sizeof(u64) !=
1582                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1583         WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1584         btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1585 }
1586 
1587 
1588 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1589 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1590 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1591 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1592 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1593                    start_offset, 64);
1594 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1595 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1596 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1597 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1598 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1599 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1600 
1601 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1602 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1603                          total_bytes, 64);
1604 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1605                          bytes_used, 64);
1606 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1607                          io_align, 32);
1608 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1609                          io_width, 32);
1610 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1611                          sector_size, 32);
1612 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1613 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1614                          dev_group, 32);
1615 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1616                          seek_speed, 8);
1617 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1618                          bandwidth, 8);
1619 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1620                          generation, 64);
1621 
1622 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1623 {
1624         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1625 }
1626 
1627 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1628 {
1629         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1630 }
1631 
1632 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1633 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1634 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1635 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1636 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1637 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1638 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1639 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1640 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1641 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1642 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1643 
1644 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1645 {
1646         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1647 }
1648 
1649 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1650 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1651 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1652                          stripe_len, 64);
1653 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1654                          io_align, 32);
1655 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1656                          io_width, 32);
1657 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1658                          sector_size, 32);
1659 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1660 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1661                          num_stripes, 16);
1662 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1663                          sub_stripes, 16);
1664 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1665 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1666 
1667 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1668                                                    int nr)
1669 {
1670         unsigned long offset = (unsigned long)c;
1671         offset += offsetof(struct btrfs_chunk, stripe);
1672         offset += nr * sizeof(struct btrfs_stripe);
1673         return (struct btrfs_stripe *)offset;
1674 }
1675 
1676 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1677 {
1678         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1679 }
1680 
1681 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1682                                          struct btrfs_chunk *c, int nr)
1683 {
1684         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1685 }
1686 
1687 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1688                                          struct btrfs_chunk *c, int nr)
1689 {
1690         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1691 }
1692 
1693 /* struct btrfs_block_group_item */
1694 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1695                          used, 64);
1696 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1697                          used, 64);
1698 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1699                         struct btrfs_block_group_item, chunk_objectid, 64);
1700 
1701 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1702                    struct btrfs_block_group_item, chunk_objectid, 64);
1703 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1704                    struct btrfs_block_group_item, flags, 64);
1705 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1706                         struct btrfs_block_group_item, flags, 64);
1707 
1708 /* struct btrfs_free_space_info */
1709 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1710                    extent_count, 32);
1711 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1712 
1713 /* struct btrfs_inode_ref */
1714 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1715 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1716 
1717 /* struct btrfs_inode_extref */
1718 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1719                    parent_objectid, 64);
1720 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1721                    name_len, 16);
1722 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1723 
1724 /* struct btrfs_inode_item */
1725 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1726 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1727 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1728 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1729 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1730 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1731 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1732 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1733 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1734 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1735 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1736 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1737 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1738                          generation, 64);
1739 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1740                          sequence, 64);
1741 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1742                          transid, 64);
1743 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1744 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1745                          nbytes, 64);
1746 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1747                          block_group, 64);
1748 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1749 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1750 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1751 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1752 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1753 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1754 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1755 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1756 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1757 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1758 
1759 /* struct btrfs_dev_extent */
1760 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1761                    chunk_tree, 64);
1762 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1763                    chunk_objectid, 64);
1764 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1765                    chunk_offset, 64);
1766 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1767 
1768 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1769 {
1770         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1771         return (unsigned long)dev + ptr;
1772 }
1773 
1774 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1775 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1776                    generation, 64);
1777 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1778 
1779 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1780 
1781 
1782 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1783 
1784 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1785                                         struct btrfs_tree_block_info *item,
1786                                         struct btrfs_disk_key *key)
1787 {
1788         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1789 }
1790 
1791 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1792                                             struct btrfs_tree_block_info *item,
1793                                             struct btrfs_disk_key *key)
1794 {
1795         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1796 }
1797 
1798 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1799                    root, 64);
1800 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1801                    objectid, 64);
1802 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1803                    offset, 64);
1804 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1805                    count, 32);
1806 
1807 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1808                    count, 32);
1809 
1810 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1811                    type, 8);
1812 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1813                    offset, 64);
1814 
1815 static inline u32 btrfs_extent_inline_ref_size(int type)
1816 {
1817         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1818             type == BTRFS_SHARED_BLOCK_REF_KEY)
1819                 return sizeof(struct btrfs_extent_inline_ref);
1820         if (type == BTRFS_SHARED_DATA_REF_KEY)
1821                 return sizeof(struct btrfs_shared_data_ref) +
1822                        sizeof(struct btrfs_extent_inline_ref);
1823         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1824                 return sizeof(struct btrfs_extent_data_ref) +
1825                        offsetof(struct btrfs_extent_inline_ref, offset);
1826         return 0;
1827 }
1828 
1829 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1830 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1831                    generation, 64);
1832 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1833 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1834 
1835 /* struct btrfs_node */
1836 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1837 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1838 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1839                          blockptr, 64);
1840 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1841                          generation, 64);
1842 
1843 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1844 {
1845         unsigned long ptr;
1846         ptr = offsetof(struct btrfs_node, ptrs) +
1847                 sizeof(struct btrfs_key_ptr) * nr;
1848         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1849 }
1850 
1851 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1852                                            int nr, u64 val)
1853 {
1854         unsigned long ptr;
1855         ptr = offsetof(struct btrfs_node, ptrs) +
1856                 sizeof(struct btrfs_key_ptr) * nr;
1857         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1858 }
1859 
1860 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1861 {
1862         unsigned long ptr;
1863         ptr = offsetof(struct btrfs_node, ptrs) +
1864                 sizeof(struct btrfs_key_ptr) * nr;
1865         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1866 }
1867 
1868 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1869                                                  int nr, u64 val)
1870 {
1871         unsigned long ptr;
1872         ptr = offsetof(struct btrfs_node, ptrs) +
1873                 sizeof(struct btrfs_key_ptr) * nr;
1874         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1875 }
1876 
1877 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1878 {
1879         return offsetof(struct btrfs_node, ptrs) +
1880                 sizeof(struct btrfs_key_ptr) * nr;
1881 }
1882 
1883 void btrfs_node_key(const struct extent_buffer *eb,
1884                     struct btrfs_disk_key *disk_key, int nr);
1885 
1886 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1887                                       struct btrfs_disk_key *disk_key, int nr)
1888 {
1889         unsigned long ptr;
1890         ptr = btrfs_node_key_ptr_offset(nr);
1891         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1892                        struct btrfs_key_ptr, key, disk_key);
1893 }
1894 
1895 /* struct btrfs_item */
1896 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1897 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1898 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1899 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1900 
1901 static inline unsigned long btrfs_item_nr_offset(int nr)
1902 {
1903         return offsetof(struct btrfs_leaf, items) +
1904                 sizeof(struct btrfs_item) * nr;
1905 }
1906 
1907 static inline struct btrfs_item *btrfs_item_nr(int nr)
1908 {
1909         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1910 }
1911 
1912 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1913                                  struct btrfs_item *item)
1914 {
1915         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1916 }
1917 
1918 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1919 {
1920         return btrfs_item_end(eb, btrfs_item_nr(nr));
1921 }
1922 
1923 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1924 {
1925         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1926 }
1927 
1928 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1929 {
1930         return btrfs_item_size(eb, btrfs_item_nr(nr));
1931 }
1932 
1933 static inline void btrfs_item_key(const struct extent_buffer *eb,
1934                            struct btrfs_disk_key *disk_key, int nr)
1935 {
1936         struct btrfs_item *item = btrfs_item_nr(nr);
1937         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1938 }
1939 
1940 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1941                                struct btrfs_disk_key *disk_key, int nr)
1942 {
1943         struct btrfs_item *item = btrfs_item_nr(nr);
1944         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1945 }
1946 
1947 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1948 
1949 /*
1950  * struct btrfs_root_ref
1951  */
1952 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1953 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1954 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1955 
1956 /* struct btrfs_dir_item */
1957 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1958 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1959 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1960 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1961 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1962 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1963                          data_len, 16);
1964 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1965                          name_len, 16);
1966 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1967                          transid, 64);
1968 
1969 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
1970                                       const struct btrfs_dir_item *item,
1971                                       struct btrfs_disk_key *key)
1972 {
1973         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1974 }
1975 
1976 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1977                                           struct btrfs_dir_item *item,
1978                                           const struct btrfs_disk_key *key)
1979 {
1980         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1981 }
1982 
1983 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1984                    num_entries, 64);
1985 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1986                    num_bitmaps, 64);
1987 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1988                    generation, 64);
1989 
1990 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
1991                                         const struct btrfs_free_space_header *h,
1992                                         struct btrfs_disk_key *key)
1993 {
1994         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1995 }
1996 
1997 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1998                                             struct btrfs_free_space_header *h,
1999                                             const struct btrfs_disk_key *key)
2000 {
2001         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2002 }
2003 
2004 /* struct btrfs_disk_key */
2005 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2006                          objectid, 64);
2007 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2008 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2009 
2010 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2011                                          const struct btrfs_disk_key *disk)
2012 {
2013         cpu->offset = le64_to_cpu(disk->offset);
2014         cpu->type = disk->type;
2015         cpu->objectid = le64_to_cpu(disk->objectid);
2016 }
2017 
2018 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2019                                          const struct btrfs_key *cpu)
2020 {
2021         disk->offset = cpu_to_le64(cpu->offset);
2022         disk->type = cpu->type;
2023         disk->objectid = cpu_to_le64(cpu->objectid);
2024 }
2025 
2026 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2027                                          struct btrfs_key *key, int nr)
2028 {
2029         struct btrfs_disk_key disk_key;
2030         btrfs_node_key(eb, &disk_key, nr);
2031         btrfs_disk_key_to_cpu(key, &disk_key);
2032 }
2033 
2034 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2035                                          struct btrfs_key *key, int nr)
2036 {
2037         struct btrfs_disk_key disk_key;
2038         btrfs_item_key(eb, &disk_key, nr);
2039         btrfs_disk_key_to_cpu(key, &disk_key);
2040 }
2041 
2042 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2043                                              const struct btrfs_dir_item *item,
2044                                              struct btrfs_key *key)
2045 {
2046         struct btrfs_disk_key disk_key;
2047         btrfs_dir_item_key(eb, item, &disk_key);
2048         btrfs_disk_key_to_cpu(key, &disk_key);
2049 }
2050 
2051 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2052 {
2053         return key->type;
2054 }
2055 
2056 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2057 {
2058         key->type = val;
2059 }
2060 
2061 /* struct btrfs_header */
2062 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2063 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2064                           generation, 64);
2065 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2066 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2067 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2068 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2069 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2070                          generation, 64);
2071 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2072 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2073                          nritems, 32);
2074 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2075 
2076 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2077 {
2078         return (btrfs_header_flags(eb) & flag) == flag;
2079 }
2080 
2081 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2082 {
2083         u64 flags = btrfs_header_flags(eb);
2084         btrfs_set_header_flags(eb, flags | flag);
2085         return (flags & flag) == flag;
2086 }
2087 
2088 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2089 {
2090         u64 flags = btrfs_header_flags(eb);
2091         btrfs_set_header_flags(eb, flags & ~flag);
2092         return (flags & flag) == flag;
2093 }
2094 
2095 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2096 {
2097         u64 flags = btrfs_header_flags(eb);
2098         return flags >> BTRFS_BACKREF_REV_SHIFT;
2099 }
2100 
2101 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2102                                                 int rev)
2103 {
2104         u64 flags = btrfs_header_flags(eb);
2105         flags &= ~BTRFS_BACKREF_REV_MASK;
2106         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2107         btrfs_set_header_flags(eb, flags);
2108 }
2109 
2110 static inline unsigned long btrfs_header_fsid(void)
2111 {
2112         return offsetof(struct btrfs_header, fsid);
2113 }
2114 
2115 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
2116 {
2117         return offsetof(struct btrfs_header, chunk_tree_uuid);
2118 }
2119 
2120 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2121 {
2122         return btrfs_header_level(eb) == 0;
2123 }
2124 
2125 /* struct btrfs_root_item */
2126 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2127                    generation, 64);
2128 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2129 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2130 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2131 
2132 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2133                          generation, 64);
2134 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2135 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2136 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2137 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2138 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2139 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2140 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2141 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2142                          last_snapshot, 64);
2143 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2144                          generation_v2, 64);
2145 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2146                          ctransid, 64);
2147 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2148                          otransid, 64);
2149 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2150                          stransid, 64);
2151 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2152                          rtransid, 64);
2153 
2154 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2155 {
2156         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2157 }
2158 
2159 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2160 {
2161         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2162 }
2163 
2164 /* struct btrfs_root_backup */
2165 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2166                    tree_root, 64);
2167 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2168                    tree_root_gen, 64);
2169 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2170                    tree_root_level, 8);
2171 
2172 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2173                    chunk_root, 64);
2174 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2175                    chunk_root_gen, 64);
2176 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2177                    chunk_root_level, 8);
2178 
2179 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2180                    extent_root, 64);
2181 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2182                    extent_root_gen, 64);
2183 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2184                    extent_root_level, 8);
2185 
2186 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2187                    fs_root, 64);
2188 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2189                    fs_root_gen, 64);
2190 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2191                    fs_root_level, 8);
2192 
2193 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2194                    dev_root, 64);
2195 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2196                    dev_root_gen, 64);
2197 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2198                    dev_root_level, 8);
2199 
2200 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2201                    csum_root, 64);
2202 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2203                    csum_root_gen, 64);
2204 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2205                    csum_root_level, 8);
2206 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2207                    total_bytes, 64);
2208 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2209                    bytes_used, 64);
2210 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2211                    num_devices, 64);
2212 
2213 /* struct btrfs_balance_item */
2214 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2215 
2216 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2217                                       const struct btrfs_balance_item *bi,
2218                                       struct btrfs_disk_balance_args *ba)
2219 {
2220         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2221 }
2222 
2223 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2224                                   struct btrfs_balance_item *bi,
2225                                   const struct btrfs_disk_balance_args *ba)
2226 {
2227         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2228 }
2229 
2230 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2231                                       const struct btrfs_balance_item *bi,
2232                                       struct btrfs_disk_balance_args *ba)
2233 {
2234         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2235 }
2236 
2237 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2238                                   struct btrfs_balance_item *bi,
2239                                   const struct btrfs_disk_balance_args *ba)
2240 {
2241         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2242 }
2243 
2244 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2245                                      const struct btrfs_balance_item *bi,
2246                                      struct btrfs_disk_balance_args *ba)
2247 {
2248         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2249 }
2250 
2251 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2252                                  struct btrfs_balance_item *bi,
2253                                  const struct btrfs_disk_balance_args *ba)
2254 {
2255         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2256 }
2257 
2258 static inline void
2259 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2260                                const struct btrfs_disk_balance_args *disk)
2261 {
2262         memset(cpu, 0, sizeof(*cpu));
2263 
2264         cpu->profiles = le64_to_cpu(disk->profiles);
2265         cpu->usage = le64_to_cpu(disk->usage);
2266         cpu->devid = le64_to_cpu(disk->devid);
2267         cpu->pstart = le64_to_cpu(disk->pstart);
2268         cpu->pend = le64_to_cpu(disk->pend);
2269         cpu->vstart = le64_to_cpu(disk->vstart);
2270         cpu->vend = le64_to_cpu(disk->vend);
2271         cpu->target = le64_to_cpu(disk->target);
2272         cpu->flags = le64_to_cpu(disk->flags);
2273         cpu->limit = le64_to_cpu(disk->limit);
2274         cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2275         cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2276 }
2277 
2278 static inline void
2279 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2280                                const struct btrfs_balance_args *cpu)
2281 {
2282         memset(disk, 0, sizeof(*disk));
2283 
2284         disk->profiles = cpu_to_le64(cpu->profiles);
2285         disk->usage = cpu_to_le64(cpu->usage);
2286         disk->devid = cpu_to_le64(cpu->devid);
2287         disk->pstart = cpu_to_le64(cpu->pstart);
2288         disk->pend = cpu_to_le64(cpu->pend);
2289         disk->vstart = cpu_to_le64(cpu->vstart);
2290         disk->vend = cpu_to_le64(cpu->vend);
2291         disk->target = cpu_to_le64(cpu->target);
2292         disk->flags = cpu_to_le64(cpu->flags);
2293         disk->limit = cpu_to_le64(cpu->limit);
2294         disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2295         disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2296 }
2297 
2298 /* struct btrfs_super_block */
2299 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2300 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2301 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2302                          generation, 64);
2303 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2304 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2305                          struct btrfs_super_block, sys_chunk_array_size, 32);
2306 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2307                          struct btrfs_super_block, chunk_root_generation, 64);
2308 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2309                          root_level, 8);
2310 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2311                          chunk_root, 64);
2312 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2313                          chunk_root_level, 8);
2314 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2315                          log_root, 64);
2316 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2317                          log_root_transid, 64);
2318 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2319                          log_root_level, 8);
2320 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2321                          total_bytes, 64);
2322 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2323                          bytes_used, 64);
2324 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2325                          sectorsize, 32);
2326 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2327                          nodesize, 32);
2328 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2329                          stripesize, 32);
2330 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2331                          root_dir_objectid, 64);
2332 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2333                          num_devices, 64);
2334 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2335                          compat_flags, 64);
2336 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2337                          compat_ro_flags, 64);
2338 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2339                          incompat_flags, 64);
2340 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2341                          csum_type, 16);
2342 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2343                          cache_generation, 64);
2344 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2345 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2346                          uuid_tree_generation, 64);
2347 
2348 static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
2349 {
2350         u16 t = btrfs_super_csum_type(s);
2351         /*
2352          * csum type is validated at mount time
2353          */
2354         return btrfs_csum_sizes[t];
2355 }
2356 
2357 
2358 /*
2359  * The leaf data grows from end-to-front in the node.
2360  * this returns the address of the start of the last item,
2361  * which is the stop of the leaf data stack
2362  */
2363 static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
2364                                          const struct extent_buffer *leaf)
2365 {
2366         u32 nr = btrfs_header_nritems(leaf);
2367 
2368         if (nr == 0)
2369                 return BTRFS_LEAF_DATA_SIZE(fs_info);
2370         return btrfs_item_offset_nr(leaf, nr - 1);
2371 }
2372 
2373 /* struct btrfs_file_extent_item */
2374 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2375 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2376                          struct btrfs_file_extent_item, disk_bytenr, 64);
2377 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2378                          struct btrfs_file_extent_item, offset, 64);
2379 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2380                          struct btrfs_file_extent_item, generation, 64);
2381 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2382                          struct btrfs_file_extent_item, num_bytes, 64);
2383 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2384                          struct btrfs_file_extent_item, disk_num_bytes, 64);
2385 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2386                          struct btrfs_file_extent_item, compression, 8);
2387 
2388 static inline unsigned long
2389 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2390 {
2391         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2392 }
2393 
2394 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2395 {
2396         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2397 }
2398 
2399 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2400                    disk_bytenr, 64);
2401 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2402                    generation, 64);
2403 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2404                    disk_num_bytes, 64);
2405 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2406                   offset, 64);
2407 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2408                    num_bytes, 64);
2409 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2410                    ram_bytes, 64);
2411 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2412                    compression, 8);
2413 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2414                    encryption, 8);
2415 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2416                    other_encoding, 16);
2417 
2418 /*
2419  * this returns the number of bytes used by the item on disk, minus the
2420  * size of any extent headers.  If a file is compressed on disk, this is
2421  * the compressed size
2422  */
2423 static inline u32 btrfs_file_extent_inline_item_len(
2424                                                 const struct extent_buffer *eb,
2425                                                 struct btrfs_item *e)
2426 {
2427         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2428 }
2429 
2430 /* this returns the number of file bytes represented by the inline item.
2431  * If an item is compressed, this is the uncompressed size
2432  */
2433 static inline u32 btrfs_file_extent_inline_len(const struct extent_buffer *eb,
2434                                         int slot,
2435                                         const struct btrfs_file_extent_item *fi)
2436 {
2437         struct btrfs_map_token token;
2438 
2439         btrfs_init_map_token(&token);
2440         /*
2441          * return the space used on disk if this item isn't
2442          * compressed or encoded
2443          */
2444         if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
2445             btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
2446             btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
2447                 return btrfs_file_extent_inline_item_len(eb,
2448                                                          btrfs_item_nr(slot));
2449         }
2450 
2451         /* otherwise use the ram bytes field */
2452         return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
2453 }
2454 
2455 
2456 /* btrfs_dev_stats_item */
2457 static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
2458                                         const struct btrfs_dev_stats_item *ptr,
2459                                         int index)
2460 {
2461         u64 val;
2462 
2463         read_extent_buffer(eb, &val,
2464                            offsetof(struct btrfs_dev_stats_item, values) +
2465                             ((unsigned long)ptr) + (index * sizeof(u64)),
2466                            sizeof(val));
2467         return val;
2468 }
2469 
2470 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2471                                              struct btrfs_dev_stats_item *ptr,
2472                                              int index, u64 val)
2473 {
2474         write_extent_buffer(eb, &val,
2475                             offsetof(struct btrfs_dev_stats_item, values) +
2476                              ((unsigned long)ptr) + (index * sizeof(u64)),
2477                             sizeof(val));
2478 }
2479 
2480 /* btrfs_qgroup_status_item */
2481 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2482                    generation, 64);
2483 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2484                    version, 64);
2485 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2486                    flags, 64);
2487 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2488                    rescan, 64);
2489 
2490 /* btrfs_qgroup_info_item */
2491 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2492                    generation, 64);
2493 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2494 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2495                    rfer_cmpr, 64);
2496 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2497 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2498                    excl_cmpr, 64);
2499 
2500 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2501                          struct btrfs_qgroup_info_item, generation, 64);
2502 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2503                          rfer, 64);
2504 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2505                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2506 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2507                          excl, 64);
2508 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2509                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
2510 
2511 /* btrfs_qgroup_limit_item */
2512 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2513                    flags, 64);
2514 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2515                    max_rfer, 64);
2516 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2517                    max_excl, 64);
2518 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2519                    rsv_rfer, 64);
2520 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2521                    rsv_excl, 64);
2522 
2523 /* btrfs_dev_replace_item */
2524 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2525                    struct btrfs_dev_replace_item, src_devid, 64);
2526 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2527                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2528                    64);
2529 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2530                    replace_state, 64);
2531 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2532                    time_started, 64);
2533 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2534                    time_stopped, 64);
2535 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2536                    num_write_errors, 64);
2537 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2538                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2539                    64);
2540 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2541                    cursor_left, 64);
2542 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2543                    cursor_right, 64);
2544 
2545 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2546                          struct btrfs_dev_replace_item, src_devid, 64);
2547 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2548                          struct btrfs_dev_replace_item,
2549                          cont_reading_from_srcdev_mode, 64);
2550 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2551                          struct btrfs_dev_replace_item, replace_state, 64);
2552 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2553                          struct btrfs_dev_replace_item, time_started, 64);
2554 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2555                          struct btrfs_dev_replace_item, time_stopped, 64);
2556 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2557                          struct btrfs_dev_replace_item, num_write_errors, 64);
2558 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2559                          struct btrfs_dev_replace_item,
2560                          num_uncorrectable_read_errors, 64);
2561 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2562                          struct btrfs_dev_replace_item, cursor_left, 64);
2563 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2564                          struct btrfs_dev_replace_item, cursor_right, 64);
2565 
2566 /* helper function to cast into the data area of the leaf. */
2567 #define btrfs_item_ptr(leaf, slot, type) \
2568         ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2569         btrfs_item_offset_nr(leaf, slot)))
2570 
2571 #define btrfs_item_ptr_offset(leaf, slot) \
2572         ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2573         btrfs_item_offset_nr(leaf, slot)))
2574 
2575 static inline u64 btrfs_name_hash(const char *name, int len)
2576 {
2577        return crc32c((u32)~1, name, len);
2578 }
2579 
2580 /*
2581  * Figure the key offset of an extended inode ref
2582  */
2583 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2584                                    int len)
2585 {
2586        return (u64) crc32c(parent_objectid, name, len);
2587 }
2588 
2589 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2590 {
2591         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2592                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2593 }
2594 
2595 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2596 {
2597         return mapping_gfp_constraint(mapping, ~__GFP_FS);
2598 }
2599 
2600 /* extent-tree.c */
2601 
2602 enum btrfs_inline_ref_type {
2603         BTRFS_REF_TYPE_INVALID =         0,
2604         BTRFS_REF_TYPE_BLOCK =           1,
2605         BTRFS_REF_TYPE_DATA =            2,
2606         BTRFS_REF_TYPE_ANY =             3,
2607 };
2608 
2609 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2610                                      struct btrfs_extent_inline_ref *iref,
2611                                      enum btrfs_inline_ref_type is_data);
2612 
2613 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2614 
2615 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2616                                                  unsigned num_items)
2617 {
2618         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2619 }
2620 
2621 /*
2622  * Doing a truncate won't result in new nodes or leaves, just what we need for
2623  * COW.
2624  */
2625 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2626                                                  unsigned num_items)
2627 {
2628         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2629 }
2630 
2631 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
2632                                        struct btrfs_fs_info *fs_info);
2633 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
2634                                        struct btrfs_fs_info *fs_info);
2635 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2636                                          const u64 start);
2637 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2638 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2639 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2640 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2641 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2642 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2643                            unsigned long count);
2644 int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2645                                  unsigned long count, u64 transid, int wait);
2646 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2647 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2648                              struct btrfs_fs_info *fs_info, u64 bytenr,
2649                              u64 offset, int metadata, u64 *refs, u64 *flags);
2650 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2651                      u64 bytenr, u64 num, int reserved);
2652 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2653                                     u64 bytenr, u64 num_bytes);
2654 int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2655                                  struct extent_buffer *eb);
2656 int btrfs_cross_ref_exist(struct btrfs_root *root,
2657                           u64 objectid, u64 offset, u64 bytenr);
2658 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2659                                                  struct btrfs_fs_info *info,
2660                                                  u64 bytenr);
2661 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2662 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2663 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2664                                              struct btrfs_root *root,
2665                                              u64 parent, u64 root_objectid,
2666                                              const struct btrfs_disk_key *key,
2667                                              int level, u64 hint,
2668                                              u64 empty_size);
2669 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2670                            struct btrfs_root *root,
2671                            struct extent_buffer *buf,
2672                            u64 parent, int last_ref);
2673 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2674                                      struct btrfs_root *root, u64 owner,
2675                                      u64 offset, u64 ram_bytes,
2676                                      struct btrfs_key *ins);
2677 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2678                                    struct btrfs_fs_info *fs_info,
2679                                    u64 root_objectid, u64 owner, u64 offset,
2680                                    struct btrfs_key *ins);
2681 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2682                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2683                          struct btrfs_key *ins, int is_data, int delalloc);
2684 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2685                   struct extent_buffer *buf, int full_backref);
2686 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2687                   struct extent_buffer *buf, int full_backref);
2688 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2689                                 struct btrfs_fs_info *fs_info,
2690                                 u64 bytenr, u64 num_bytes, u64 flags,
2691                                 int level, int is_data);
2692 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2693                       struct btrfs_root *root,
2694                       u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2695                       u64 owner, u64 offset);
2696 
2697 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2698                                u64 start, u64 len, int delalloc);
2699 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2700                                        u64 start, u64 len);
2701 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2702 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2703 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2704                          struct btrfs_root *root,
2705                          u64 bytenr, u64 num_bytes, u64 parent,
2706                          u64 root_objectid, u64 owner, u64 offset);
2707 
2708 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
2709 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2710                                    struct btrfs_fs_info *fs_info);
2711 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2712                             struct btrfs_fs_info *fs_info);
2713 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2714 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2715 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2716 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2717 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2718                            struct btrfs_fs_info *fs_info, u64 bytes_used,
2719                            u64 type, u64 chunk_offset, u64 size);
2720 void btrfs_add_raid_kobjects(struct btrfs_fs_info *fs_info);
2721 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2722                                 struct btrfs_fs_info *fs_info,
2723                                 const u64 chunk_offset);
2724 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2725                              struct btrfs_fs_info *fs_info, u64 group_start,
2726                              struct extent_map *em);
2727 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2728 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2729 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2730 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
2731 u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info);
2732 u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info);
2733 u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info);
2734 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2735 
2736 enum btrfs_reserve_flush_enum {
2737         /* If we are in the transaction, we can't flush anything.*/
2738         BTRFS_RESERVE_NO_FLUSH,
2739         /*
2740          * Flushing delalloc may cause deadlock somewhere, in this
2741          * case, use FLUSH LIMIT
2742          */
2743         BTRFS_RESERVE_FLUSH_LIMIT,
2744         BTRFS_RESERVE_FLUSH_ALL,
2745 };
2746 
2747 enum btrfs_flush_state {
2748         FLUSH_DELAYED_ITEMS_NR  =       1,
2749         FLUSH_DELAYED_ITEMS     =       2,
2750         FLUSH_DELALLOC          =       3,
2751         FLUSH_DELALLOC_WAIT     =       4,
2752         ALLOC_CHUNK             =       5,
2753         COMMIT_TRANS            =       6,
2754 };
2755 
2756 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
2757 int btrfs_check_data_free_space(struct inode *inode,
2758                         struct extent_changeset **reserved, u64 start, u64 len);
2759 void btrfs_free_reserved_data_space(struct inode *inode,
2760                         struct extent_changeset *reserved, u64 start, u64 len);
2761 void btrfs_delalloc_release_space(struct inode *inode,
2762                                   struct extent_changeset *reserved,
2763                                   u64 start, u64 len, bool qgroup_free);
2764 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2765                                             u64 len);
2766 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2767 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
2768                                   struct btrfs_inode *inode);
2769 void btrfs_orphan_release_metadata(struct btrfs_inode *inode);
2770 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2771                                      struct btrfs_block_rsv *rsv,
2772                                      int nitems,
2773                                      u64 *qgroup_reserved, bool use_global_rsv);
2774 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2775                                       struct btrfs_block_rsv *rsv);
2776 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes,
2777                                     bool qgroup_free);
2778 
2779 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2780 void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes,
2781                                      bool qgroup_free);
2782 int btrfs_delalloc_reserve_space(struct inode *inode,
2783                         struct extent_changeset **reserved, u64 start, u64 len);
2784 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2785 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2786                                               unsigned short type);
2787 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
2788                                    struct btrfs_block_rsv *rsv,
2789                                    unsigned short type);
2790 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2791                           struct btrfs_block_rsv *rsv);
2792 void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv);
2793 int btrfs_block_rsv_add(struct btrfs_root *root,
2794                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2795                         enum btrfs_reserve_flush_enum flush);
2796 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2797 int btrfs_block_rsv_refill(struct btrfs_root *root,
2798                            struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2799                            enum btrfs_reserve_flush_enum flush);
2800 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2801                             struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2802                             int update_size);
2803 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2804                              struct btrfs_block_rsv *dest, u64 num_bytes,
2805                              int min_factor);
2806 void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2807                              struct btrfs_block_rsv *block_rsv,
2808                              u64 num_bytes);
2809 int btrfs_inc_block_group_ro(struct btrfs_fs_info *fs_info,
2810                              struct btrfs_block_group_cache *cache);
2811 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2812 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2813 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2814 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2815                                    u64 start, u64 end);
2816 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2817                          u64 num_bytes, u64 *actual_bytes);
2818 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
2819                             struct btrfs_fs_info *fs_info, u64 type);
2820 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2821 
2822 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2823 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2824                                          struct btrfs_fs_info *fs_info);
2825 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2826 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2827 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2828 void check_system_chunk(struct btrfs_trans_handle *trans,
2829                         struct btrfs_fs_info *fs_info, const u64 type);
2830 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2831                        struct btrfs_fs_info *info, u64 start, u64 end);
2832 
2833 /* ctree.c */
2834 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2835                      int level, int *slot);
2836 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2837 int btrfs_previous_item(struct btrfs_root *root,
2838                         struct btrfs_path *path, u64 min_objectid,
2839                         int type);
2840 int btrfs_previous_extent_item(struct btrfs_root *root,
2841                         struct btrfs_path *path, u64 min_objectid);
2842 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2843                              struct btrfs_path *path,
2844                              const struct btrfs_key *new_key);
2845 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2846 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2847 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2848 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2849                         struct btrfs_key *key, int lowest_level,
2850                         u64 min_trans);
2851 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2852                          struct btrfs_path *path,
2853                          u64 min_trans);
2854 enum btrfs_compare_tree_result {
2855         BTRFS_COMPARE_TREE_NEW,
2856         BTRFS_COMPARE_TREE_DELETED,
2857         BTRFS_COMPARE_TREE_CHANGED,
2858         BTRFS_COMPARE_TREE_SAME,
2859 };
2860 typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
2861                                   struct btrfs_path *right_path,
2862                                   struct btrfs_key *key,
2863                                   enum btrfs_compare_tree_result result,
2864                                   void *ctx);
2865 int btrfs_compare_trees(struct btrfs_root *left_root,
2866                         struct btrfs_root *right_root,
2867                         btrfs_changed_cb_t cb, void *ctx);
2868 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2869                     struct btrfs_root *root, struct extent_buffer *buf,
2870                     struct extent_buffer *parent, int parent_slot,
2871                     struct extent_buffer **cow_ret);
2872 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2873                       struct btrfs_root *root,
2874                       struct extent_buffer *buf,
2875                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2876 int btrfs_block_can_be_shared(struct btrfs_root *root,
2877                               struct extent_buffer *buf);
2878 void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2879                        u32 data_size);
2880 void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2881                          struct btrfs_path *path, u32 new_size, int from_end);
2882 int btrfs_split_item(struct btrfs_trans_handle *trans,
2883                      struct btrfs_root *root,
2884                      struct btrfs_path *path,
2885                      const struct btrfs_key *new_key,
2886                      unsigned long split_offset);
2887 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2888                          struct btrfs_root *root,
2889                          struct btrfs_path *path,
2890                          const struct btrfs_key *new_key);
2891 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2892                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2893 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2894                       const struct btrfs_key *key, struct btrfs_path *p,
2895                       int ins_len, int cow);
2896 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2897                           struct btrfs_path *p, u64 time_seq);
2898 int btrfs_search_slot_for_read(struct btrfs_root *root,
2899                                const struct btrfs_key *key,
2900                                struct btrfs_path *p, int find_higher,
2901                                int return_any);
2902 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2903                        struct btrfs_root *root, struct extent_buffer *parent,
2904                        int start_slot, u64 *last_ret,
2905                        struct btrfs_key *progress);
2906 void btrfs_release_path(struct btrfs_path *p);
2907 struct btrfs_path *btrfs_alloc_path(void);
2908 void btrfs_free_path(struct btrfs_path *p);
2909 void btrfs_set_path_blocking(struct btrfs_path *p);
2910 void btrfs_clear_path_blocking(struct btrfs_path *p,
2911                                struct extent_buffer *held, int held_rw);
2912 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2913 
2914 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2915                    struct btrfs_path *path, int slot, int nr);
2916 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2917                                  struct btrfs_root *root,
2918                                  struct btrfs_path *path)
2919 {
2920         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2921 }
2922 
2923 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2924                             const struct btrfs_key *cpu_key, u32 *data_size,
2925                             u32 total_data, u32 total_size, int nr);
2926 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2927                       const struct btrfs_key *key, void *data, u32 data_size);
2928 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2929                              struct btrfs_root *root,
2930                              struct btrfs_path *path,
2931                              const struct btrfs_key *cpu_key, u32 *data_size,
2932                              int nr);
2933 
2934 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2935                                           struct btrfs_root *root,
2936                                           struct btrfs_path *path,
2937                                           const struct btrfs_key *key,
2938                                           u32 data_size)
2939 {
2940         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2941 }
2942 
2943 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2944 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2945 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2946                         u64 time_seq);
2947 static inline int btrfs_next_old_item(struct btrfs_root *root,
2948                                       struct btrfs_path *p, u64 time_seq)
2949 {
2950         ++p->slots[0];
2951         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2952                 return btrfs_next_old_leaf(root, p, time_seq);
2953         return 0;
2954 }
2955 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2956 {
2957         return btrfs_next_old_item(root, p, 0);
2958 }
2959 int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
2960                           struct extent_buffer *leaf);
2961 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2962                                      struct btrfs_block_rsv *block_rsv,
2963                                      int update_ref, int for_reloc);
2964 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2965                         struct btrfs_root *root,
2966                         struct extent_buffer *node,
2967                         struct extent_buffer *parent);
2968 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2969 {
2970         /*
2971          * Do it this way so we only ever do one test_bit in the normal case.
2972          */
2973         if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2974                 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2975                         return 2;
2976                 return 1;
2977         }
2978         return 0;
2979 }
2980 
2981 /*
2982  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2983  * anything except sleeping. This function is used to check the status of
2984  * the fs.
2985  */
2986 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2987 {
2988         return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
2989 }
2990 
2991 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2992 {
2993         kfree(fs_info->balance_ctl);
2994         kfree(fs_info->delayed_root);
2995         kfree(fs_info->extent_root);
2996         kfree(fs_info->tree_root);
2997         kfree(fs_info->chunk_root);
2998         kfree(fs_info->dev_root);
2999         kfree(fs_info->csum_root);
3000         kfree(fs_info->quota_root);
3001         kfree(fs_info->uuid_root);
3002         kfree(fs_info->free_space_root);
3003         kfree(fs_info->super_copy);
3004         kfree(fs_info->super_for_commit);
3005         security_free_mnt_opts(&fs_info->security_opts);
3006         kvfree(fs_info);
3007 }
3008 
3009 /* tree mod log functions from ctree.c */
3010 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3011                            struct seq_list *elem);
3012 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3013                             struct seq_list *elem);
3014 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3015 
3016 /* root-item.c */
3017 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
3018                        struct btrfs_fs_info *fs_info,
3019                        u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
3020                        const char *name, int name_len);
3021 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
3022                        struct btrfs_fs_info *fs_info,
3023                        u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
3024                        const char *name, int name_len);
3025 int btrfs_del_root(struct btrfs_trans_handle *trans,
3026                    struct btrfs_fs_info *fs_info, const struct btrfs_key *key);
3027 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3028                       const struct btrfs_key *key,
3029                       struct btrfs_root_item *item);
3030 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3031                                    struct btrfs_root *root,
3032                                    struct btrfs_key *key,
3033                                    struct btrfs_root_item *item);
3034 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3035                     struct btrfs_path *path, struct btrfs_root_item *root_item,
3036                     struct btrfs_key *root_key);
3037 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3038 void btrfs_set_root_node(struct btrfs_root_item *item,
3039                          struct extent_buffer *node);
3040 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3041 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3042                              struct btrfs_root *root);
3043 
3044 /* uuid-tree.c */
3045 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
3046                         struct btrfs_fs_info *fs_info, u8 *uuid, u8 type,
3047                         u64 subid);
3048 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
3049                         struct btrfs_fs_info *fs_info, u8 *uuid, u8 type,
3050                         u64 subid);
3051 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3052                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3053                                               u64));
3054 
3055 /* dir-item.c */
3056 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3057                           const char *name, int name_len);
3058 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3059                           struct btrfs_root *root, const char *name,
3060                           int name_len, struct btrfs_inode *dir,
3061                           struct btrfs_key *location, u8 type, u64 index);
3062 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3063                                              struct btrfs_root *root,
3064                                              struct btrfs_path *path, u64 dir,
3065                                              const char *name, int name_len,
3066                                              int mod);
3067 struct btrfs_dir_item *
3068 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3069                             struct btrfs_root *root,
3070                             struct btrfs_path *path, u64 dir,
3071                             u64 objectid, const char *name, int name_len,
3072                             int mod);
3073 struct btrfs_dir_item *
3074 btrfs_search_dir_index_item(struct btrfs_root *root,
3075                             struct btrfs_path *path, u64 dirid,
3076                             const char *name, int name_len);
3077 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3078                               struct btrfs_root *root,
3079                               struct btrfs_path *path,
3080                               struct btrfs_dir_item *di);
3081 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3082                             struct btrfs_root *root,
3083                             struct btrfs_path *path, u64 objectid,
3084                             const char *name, u16 name_len,
3085                             const void *data, u16 data_len);
3086 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3087                                           struct btrfs_root *root,
3088                                           struct btrfs_path *path, u64 dir,
3089                                           const char *name, u16 name_len,
3090                                           int mod);
3091 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3092                                                  struct btrfs_path *path,
3093                                                  const char *name,
3094                                                  int name_len);
3095 
3096 /* orphan.c */
3097 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3098                              struct btrfs_root *root, u64 offset);
3099 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3100                           struct btrfs_root *root, u64 offset);
3101 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3102 
3103 /* inode-item.c */
3104 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3105                            struct btrfs_root *root,
3106                            const char *name, int name_len,
3107                            u64 inode_objectid, u64 ref_objectid, u64 index);
3108 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3109                            struct btrfs_root *root,
3110                            const char *name, int name_len,
3111                            u64 inode_objectid, u64 ref_objectid, u64 *index);
3112 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3113                              struct btrfs_root *root,
3114                              struct btrfs_path *path, u64 objectid);
3115 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3116                        *root, struct btrfs_path *path,
3117                        struct btrfs_key *location, int mod);
3118 
3119 struct btrfs_inode_extref *
3120 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3121                           struct btrfs_root *root,
3122                           struct btrfs_path *path,
3123                           const char *name, int name_len,
3124                           u64 inode_objectid, u64 ref_objectid, int ins_len,
3125                           int cow);
3126 
3127 int btrfs_find_name_in_backref(struct extent_buffer *leaf, int slot,
3128                                const char *name,
3129                                int name_len, struct btrfs_inode_ref **ref_ret);
3130 int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
3131                                    u64 ref_objectid, const char *name,
3132                                    int name_len,
3133                                    struct btrfs_inode_extref **extref_ret);
3134 
3135 /* file-item.c */
3136 struct btrfs_dio_private;
3137 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3138                     struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
3139 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3140 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3141                               u64 logical_offset);
3142 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3143                              struct btrfs_root *root,
3144                              u64 objectid, u64 pos,
3145                              u64 disk_offset, u64 disk_num_bytes,
3146                              u64 num_bytes, u64 offset, u64 ram_bytes,
3147                              u8 compression, u8 encryption, u16 other_encoding);
3148 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3149                              struct btrfs_root *root,
3150                              struct btrfs_path *path, u64 objectid,
3151                              u64 bytenr, int mod);
3152 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3153                            struct btrfs_root *root,
3154                            struct btrfs_ordered_sum *sums);
3155 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3156                        u64 file_start, int contig);
3157 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3158                              struct list_head *list, int search_commit);
3159 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3160                                      const struct btrfs_path *path,
3161                                      struct btrfs_file_extent_item *fi,
3162                                      const bool new_inline,
3163                                      struct extent_map *em);
3164 
3165 /* inode.c */
3166 struct btrfs_delalloc_work {
3167         struct inode *inode;
3168         int delay_iput;
3169         struct completion completion;
3170         struct list_head list;
3171         struct btrfs_work work;
3172 };
3173 
3174 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3175                                                     int delay_iput);
3176 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3177 
3178 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3179                 struct page *page, size_t pg_offset, u64 start,
3180                 u64 len, int create);
3181 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3182                               u64 *orig_start, u64 *orig_block_len,
3183                               u64 *ram_bytes);
3184 
3185 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3186                                 struct btrfs_inode *inode);
3187 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3188 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3189 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3190                        struct btrfs_root *root,
3191                        struct btrfs_inode *dir, struct btrfs_inode *inode,
3192                        const char *name, int name_len);
3193 int btrfs_add_link(struct btrfs_trans_handle *trans,
3194                    struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3195                    const char *name, int name_len, int add_backref, u64 index);
3196 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3197                         struct btrfs_root *root,
3198                         struct inode *dir, u64 objectid,
3199                         const char *name, int name_len);
3200 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3201                         int front);
3202 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3203                                struct btrfs_root *root,
3204                                struct inode *inode, u64 new_size,
3205                                u32 min_type);
3206 
3207 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3208 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
3209                                int nr);
3210 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3211                               unsigned int extra_bits,
3212                               struct extent_state **cached_state, int dedupe);
3213 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3214                              struct btrfs_root *new_root,
3215                              struct btrfs_root *parent_root,
3216                              u64 new_dirid);
3217 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3218                          size_t size, struct bio *bio,
3219                          unsigned long bio_flags);
3220 void btrfs_set_range_writeback(void *private_data, u64 start, u64 end);
3221 int btrfs_page_mkwrite(struct vm_fault *vmf);
3222 int btrfs_readpage(struct file *file, struct page *page);
3223 void btrfs_evict_inode(struct inode *inode);
3224 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3225 struct inode *btrfs_alloc_inode(struct super_block *sb);
3226 void btrfs_destroy_inode(struct inode *inode);
3227 int btrfs_drop_inode(struct inode *inode);
3228 int __init btrfs_init_cachep(void);
3229 void __cold btrfs_destroy_cachep(void);
3230 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3231                          struct btrfs_root *root, int *was_new);
3232 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3233                 struct page *page, size_t pg_offset,
3234                 u64 start, u64 end, int create);
3235 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3236                               struct btrfs_root *root,
3237                               struct inode *inode);
3238 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3239                                 struct btrfs_root *root, struct inode *inode);
3240 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3241                 struct btrfs_inode *inode);
3242 int btrfs_orphan_cleanup(struct btrfs_root *root);
3243 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3244                               struct btrfs_root *root);
3245 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3246 void btrfs_invalidate_inodes(struct btrfs_root *root);
3247 void btrfs_add_delayed_iput(struct inode *inode);
3248 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3249 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3250                               u64 start, u64 num_bytes, u64 min_size,
3251                               loff_t actual_len, u64 *alloc_hint);
3252 int btrfs_prealloc_file_range_trans(struct inode *inode,
3253                                     struct btrfs_trans_handle *trans, int mode,
3254                                     u64 start, u64 num_bytes, u64 min_size,
3255                                     loff_t actual_len, u64 *alloc_hint);
3256 extern const struct dentry_operations btrfs_dentry_operations;
3257 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3258 void btrfs_test_inode_set_ops(struct inode *inode);
3259 #endif
3260 
3261 /* ioctl.c */
3262 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3263 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3264 int btrfs_ioctl_get_supported_features(void __user *arg);
3265 void btrfs_update_iflags(struct inode *inode);
3266 int btrfs_is_empty_uuid(u8 *uuid);
3267 int btrfs_defrag_file(struct inode *inode, struct file *file,
3268                       struct btrfs_ioctl_defrag_range_args *range,
3269                       u64 newer_than, unsigned long max_pages);
3270 void btrfs_get_block_group_info(struct list_head *groups_list,
3271                                 struct btrfs_ioctl_space_info *space);
3272 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3273                                struct btrfs_ioctl_balance_args *bargs);
3274 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3275                            struct file *dst_file, u64 dst_loff);
3276 
3277 /* file.c */
3278 int __init btrfs_auto_defrag_init(void);
3279 void __cold btrfs_auto_defrag_exit(void);
3280 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3281                            struct btrfs_inode *inode);
3282 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3283 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3284 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3285 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3286                              int skip_pinned);
3287 extern const struct file_operations btrfs_file_operations;
3288 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3289                          struct btrfs_root *root, struct inode *inode,
3290                          struct btrfs_path *path, u64 start, u64 end,
3291                          u64 *drop_end, int drop_cache,
3292                          int replace_extent,
3293                          u32 extent_item_size,
3294                          int *key_inserted);
3295 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3296                        struct btrfs_root *root, struct inode *inode, u64 start,
3297                        u64 end, int drop_cache);
3298 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3299                               struct btrfs_inode *inode, u64 start, u64 end);
3300 int btrfs_release_file(struct inode *inode, struct file *file);
3301 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3302                       size_t num_pages, loff_t pos, size_t write_bytes,
3303                       struct extent_state **cached);
3304 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3305 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
3306                            struct file *file_out, loff_t pos_out, u64 len);
3307 
3308 /* tree-defrag.c */
3309 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3310                         struct btrfs_root *root);
3311 
3312 /* sysfs.c */
3313 int __init btrfs_init_sysfs(void);
3314 void __cold btrfs_exit_sysfs(void);
3315 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3316 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3317 
3318 /* super.c */
3319 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3320                         unsigned long new_flags);
3321 int btrfs_sync_fs(struct super_block *sb, int wait);
3322 
3323 static inline __printf(2, 3) __cold
3324 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3325 {
3326 }
3327 
3328 #ifdef CONFIG_PRINTK
3329 __printf(2, 3)
3330 __cold
3331 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3332 #else
3333 #define btrfs_printk(fs_info, fmt, args...) \
3334         btrfs_no_printk(fs_info, fmt, ##args)
3335 #endif
3336 
3337 #define btrfs_emerg(fs_info, fmt, args...) \
3338         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3339 #define btrfs_alert(fs_info, fmt, args...) \
3340         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3341 #define btrfs_crit(fs_info, fmt, args...) \
3342         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3343 #define btrfs_err(fs_info, fmt, args...) \
3344         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3345 #define btrfs_warn(fs_info, fmt, args...) \
3346         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3347 #define btrfs_notice(fs_info, fmt, args...) \
3348         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3349 #define btrfs_info(fs_info, fmt, args...) \
3350         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3351 
3352 /*
3353  * Wrappers that use printk_in_rcu
3354  */
3355 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3356         btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3357 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3358         btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3359 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3360         btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3361 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3362         btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3363 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3364         btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3365 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3366         btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3367 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3368         btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3369 
3370 /*
3371  * Wrappers that use a ratelimited printk_in_rcu
3372  */
3373 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3374         btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3375 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3376         btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3377 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3378         btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3379 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3380         btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3381 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3382         btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3383 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3384         btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3385 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3386         btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3387 
3388 /*
3389  * Wrappers that use a ratelimited printk
3390  */
3391 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3392         btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3393 #define btrfs_alert_rl(fs_info, fmt, args...) \
3394         btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3395 #define btrfs_crit_rl(fs_info, fmt, args...) \
3396         btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3397 #define btrfs_err_rl(fs_info, fmt, args...) \
3398         btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3399 #define btrfs_warn_rl(fs_info, fmt, args...) \
3400         btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3401 #define btrfs_notice_rl(fs_info, fmt, args...) \
3402         btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3403 #define btrfs_info_rl(fs_info, fmt, args...) \
3404         btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3405 
3406 #if defined(CONFIG_DYNAMIC_DEBUG)
3407 #define btrfs_debug(fs_info, fmt, args...)                              \
3408 do {                                                                    \
3409         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3410         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3411                 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args);          \
3412 } while (0)
3413 #define btrfs_debug_in_rcu(fs_info, fmt, args...)                       \
3414 do {                                                                    \
3415         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3416         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3417                 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args);   \
3418 } while (0)
3419 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)                    \
3420 do {                                                                    \
3421         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3422         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3423                 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt,         \
3424                                        ##args);\
3425 } while (0)
3426 #define btrfs_debug_rl(fs_info, fmt, args...)                           \
3427 do {                                                                    \
3428         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3429         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3430                 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt,       \
3431                                          ##args);                       \
3432 } while (0)
3433 #elif defined(DEBUG)
3434 #define btrfs_debug(fs_info, fmt, args...) \
3435         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3436 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3437         btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3438 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3439         btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3440 #define btrfs_debug_rl(fs_info, fmt, args...) \
3441         btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3442 #else
3443 #define btrfs_debug(fs_info, fmt, args...) \
3444         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3445 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3446         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3447 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3448         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3449 #define btrfs_debug_rl(fs_info, fmt, args...) \
3450         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3451 #endif
3452 
3453 #define btrfs_printk_in_rcu(fs_info, fmt, args...)      \
3454 do {                                                    \
3455         rcu_read_lock();                                \
3456         btrfs_printk(fs_info, fmt, ##args);             \
3457         rcu_read_unlock();                              \
3458 } while (0)
3459 
3460 #define btrfs_printk_ratelimited(fs_info, fmt, args...)         \
3461 do {                                                            \
3462         static DEFINE_RATELIMIT_STATE(_rs,                      \
3463                 DEFAULT_RATELIMIT_INTERVAL,                     \
3464                 DEFAULT_RATELIMIT_BURST);                       \
3465         if (__ratelimit(&_rs))                                  \
3466                 btrfs_printk(fs_info, fmt, ##args);             \
3467 } while (0)
3468 
3469 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)           \
3470 do {                                                            \
3471         rcu_read_lock();                                        \
3472         btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
3473         rcu_read_unlock();                                      \
3474 } while (0)
3475 
3476 #ifdef CONFIG_BTRFS_ASSERT
3477 
3478 __cold
3479 static inline void assfail(char *expr, char *file, int line)
3480 {
3481         pr_err("assertion failed: %s, file: %s, line: %d\n",
3482                expr, file, line);
3483         BUG();
3484 }
3485 
3486 #define ASSERT(expr)    \
3487         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3488 #else
3489 #define ASSERT(expr)    ((void)0)
3490 #endif
3491 
3492 __printf(5, 6)
3493 __cold
3494 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3495                      unsigned int line, int errno, const char *fmt, ...);
3496 
3497 const char *btrfs_decode_error(int errno);
3498 
3499 __cold
3500 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3501                                const char *function,
3502                                unsigned int line, int errno);
3503 
3504 /*
3505  * Call btrfs_abort_transaction as early as possible when an error condition is
3506  * detected, that way the exact line number is reported.
3507  */
3508 #define btrfs_abort_transaction(trans, errno)           \
3509 do {                                                            \
3510         /* Report first abort since mount */                    \
3511         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
3512                         &((trans)->fs_info->fs_state))) {       \
3513                 if ((errno) != -EIO) {                          \
3514                         WARN(1, KERN_DEBUG                              \
3515                         "BTRFS: Transaction aborted (error %d)\n",      \
3516                         (errno));                                       \
3517                 } else {                                                \
3518                         btrfs_debug((trans)->fs_info,                   \
3519                                     "Transaction aborted (error %d)", \
3520                                   (errno));                     \
3521                 }                                               \
3522         }                                                       \
3523         __btrfs_abort_transaction((trans), __func__,            \
3524                                   __LINE__, (errno));           \
3525 } while (0)
3526 
3527 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)             \
3528 do {                                                            \
3529         __btrfs_handle_fs_error((fs_info), __func__, __LINE__,  \
3530                           (errno), fmt, ##args);                \
3531 } while (0)
3532 
3533 __printf(5, 6)
3534 __cold
3535 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3536                    unsigned int line, int errno, const char *fmt, ...);
3537 /*
3538  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3539  * will panic().  Otherwise we BUG() here.
3540  */
3541 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
3542 do {                                                                    \
3543         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3544         BUG();                                                          \
3545 } while (0)
3546 
3547 
3548 /* compatibility and incompatibility defines */
3549 
3550 #define btrfs_set_fs_incompat(__fs_info, opt) \
3551         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3552 
3553 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3554                                            u64 flag)
3555 {
3556         struct btrfs_super_block *disk_super;
3557         u64 features;
3558 
3559         disk_super = fs_info->super_copy;
3560         features = btrfs_super_incompat_flags(disk_super);
3561         if (!(features & flag)) {
3562                 spin_lock(&fs_info->super_lock);
3563                 features = btrfs_super_incompat_flags(disk_super);
3564                 if (!(features & flag)) {
3565                         features |= flag;
3566                         btrfs_set_super_incompat_flags(disk_super, features);
3567                         btrfs_info(fs_info, "setting %llu feature flag",
3568                                          flag);
3569                 }
3570                 spin_unlock(&fs_info->super_lock);
3571         }
3572 }
3573 
3574 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3575         __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3576 
3577 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3578                                              u64 flag)
3579 {
3580         struct btrfs_super_block *disk_super;
3581         u64 features;
3582 
3583         disk_super = fs_info->super_copy;
3584         features = btrfs_super_incompat_flags(disk_super);
3585         if (features & flag) {
3586                 spin_lock(&fs_info->super_lock);
3587                 features = btrfs_super_incompat_flags(disk_super);
3588                 if (features & flag) {
3589                         features &= ~flag;
3590                         btrfs_set_super_incompat_flags(disk_super, features);
3591                         btrfs_info(fs_info, "clearing %llu feature flag",
3592                                          flag);
3593                 }
3594                 spin_unlock(&fs_info->super_lock);
3595         }
3596 }
3597 
3598 #define btrfs_fs_incompat(fs_info, opt) \
3599         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3600 
3601 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3602 {
3603         struct btrfs_super_block *disk_super;
3604         disk_super = fs_info->super_copy;
3605         return !!(btrfs_super_incompat_flags(disk_super) & flag);
3606 }
3607 
3608 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3609         __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3610 
3611 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3612                                             u64 flag)
3613 {
3614         struct btrfs_super_block *disk_super;
3615         u64 features;
3616 
3617         disk_super = fs_info->super_copy;
3618         features = btrfs_super_compat_ro_flags(disk_super);
3619         if (!(features & flag)) {
3620                 spin_lock(&fs_info->super_lock);
3621                 features = btrfs_super_compat_ro_flags(disk_super);
3622                 if (!(features & flag)) {
3623                         features |= flag;
3624                         btrfs_set_super_compat_ro_flags(disk_super, features);
3625                         btrfs_info(fs_info, "setting %llu ro feature flag",
3626                                    flag);
3627                 }
3628                 spin_unlock(&fs_info->super_lock);
3629         }
3630 }
3631 
3632 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3633         __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3634 
3635 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3636                                               u64 flag)
3637 {
3638         struct btrfs_super_block *disk_super;
3639         u64 features;
3640 
3641         disk_super = fs_info->super_copy;
3642         features = btrfs_super_compat_ro_flags(disk_super);
3643         if (features & flag) {
3644                 spin_lock(&fs_info->super_lock);
3645                 features = btrfs_super_compat_ro_flags(disk_super);
3646                 if (features & flag) {
3647                         features &= ~flag;
3648                         btrfs_set_super_compat_ro_flags(disk_super, features);
3649                         btrfs_info(fs_info, "clearing %llu ro feature flag",
3650                                    flag);
3651                 }
3652                 spin_unlock(&fs_info->super_lock);
3653         }
3654 }
3655 
3656 #define btrfs_fs_compat_ro(fs_info, opt) \
3657         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3658 
3659 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3660 {
3661         struct btrfs_super_block *disk_super;
3662         disk_super = fs_info->super_copy;
3663         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3664 }
3665 
3666 /* acl.c */
3667 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3668 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3669 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3670 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3671                    struct inode *inode, struct inode *dir);
3672 #else
3673 #define btrfs_get_acl NULL
3674 #define btrfs_set_acl NULL
3675 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3676                                  struct inode *inode, struct inode *dir)
3677 {
3678         return 0;
3679 }
3680 #endif
3681 
3682 /* relocation.c */
3683 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3684 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3685                           struct btrfs_root *root);
3686 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3687                             struct btrfs_root *root);
3688 int btrfs_recover_relocation(struct btrfs_root *root);
3689 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3690 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3691                           struct btrfs_root *root, struct extent_buffer *buf,
3692                           struct extent_buffer *cow);
3693 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3694                               u64 *bytes_to_reserve);
3695 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3696                               struct btrfs_pending_snapshot *pending);
3697 
3698 /* scrub.c */
3699 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3700                     u64 end, struct btrfs_scrub_progress *progress,
3701                     int readonly, int is_dev_replace);
3702 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3703 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3704 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3705 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3706                            struct btrfs_device *dev);
3707 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3708                          struct btrfs_scrub_progress *progress);
3709 static inline void btrfs_init_full_stripe_locks_tree(
3710                         struct btrfs_full_stripe_locks_tree *locks_root)
3711 {
3712         locks_root->root = RB_ROOT;
3713         mutex_init(&locks_root->lock);
3714 }
3715 
3716 /* dev-replace.c */
3717 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3718 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3719 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3720 
3721 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3722 {
3723         btrfs_bio_counter_sub(fs_info, 1);
3724 }
3725 
3726 /* reada.c */
3727 struct reada_control {
3728         struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
3729         struct btrfs_key        key_start;
3730         struct btrfs_key        key_end;        /* exclusive */
3731         atomic_t                elems;
3732         struct kref             refcnt;
3733         wait_queue_head_t       wait;
3734 };
3735 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3736                               struct btrfs_key *start, struct btrfs_key *end);
3737 int btrfs_reada_wait(void *handle);
3738 void btrfs_reada_detach(void *handle);
3739 int btree_readahead_hook(struct extent_buffer *eb, int err);
3740 
3741 static inline int is_fstree(u64 rootid)
3742 {
3743         if (rootid == BTRFS_FS_TREE_OBJECTID ||
3744             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3745               !btrfs_qgroup_level(rootid)))
3746                 return 1;
3747         return 0;
3748 }
3749 
3750 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3751 {
3752         return signal_pending(current);
3753 }
3754 
3755 /* Sanity test specific functions */
3756 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3757 void btrfs_test_destroy_inode(struct inode *inode);
3758 #endif
3759 
3760 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3761 {
3762 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3763         if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
3764                               &fs_info->fs_state)))
3765                 return 1;
3766 #endif
3767         return 0;
3768 }
3769 
3770 #endif
3771 

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