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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 struct btrfs_delayed_ref_root;
 39 extern struct kmem_cache *btrfs_trans_handle_cachep;
 40 extern struct kmem_cache *btrfs_bit_radix_cachep;
 41 extern struct kmem_cache *btrfs_path_cachep;
 42 extern struct kmem_cache *btrfs_free_space_cachep;
 43 struct btrfs_ordered_sum;
 44 
 45 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
 46 
 47 #define BTRFS_MAX_MIRRORS 3
 48 
 49 #define BTRFS_MAX_LEVEL 8
 50 
 51 #define BTRFS_OLDEST_GENERATION 0ULL
 52 
 53 /*
 54  * the max metadata block size.  This limit is somewhat artificial,
 55  * but the memmove costs go through the roof for larger blocks.
 56  */
 57 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 58 
 59 /*
 60  * we can actually store much bigger names, but lets not confuse the rest
 61  * of linux
 62  */
 63 #define BTRFS_NAME_LEN 255
 64 
 65 /*
 66  * Theoretical limit is larger, but we keep this down to a sane
 67  * value. That should limit greatly the possibility of collisions on
 68  * inode ref items.
 69  */
 70 #define BTRFS_LINK_MAX 65535U
 71 
 72 /* four bytes for CRC32 */
 73 static const int btrfs_csum_sizes[] = { 4 };
 74 
 75 #define BTRFS_EMPTY_DIR_SIZE 0
 76 
 77 /* ioprio of readahead is set to idle */
 78 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
 79 
 80 #define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
 81 
 82 /*
 83  * Use large batch size to reduce overhead of metadata updates.  On the reader
 84  * side, we only read it when we are close to ENOSPC and the read overhead is
 85  * mostly related to the number of CPUs, so it is OK to use arbitrary large
 86  * value here.
 87  */
 88 #define BTRFS_TOTAL_BYTES_PINNED_BATCH  SZ_128M
 89 
 90 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
 91 
 92 
 93 /*
 94  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
 95  */
 96 static inline u32 count_max_extents(u64 size)
 97 {
 98         return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
 99 }
100 
101 struct btrfs_mapping_tree {
102         struct extent_map_tree map_tree;
103 };
104 
105 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
106 {
107         BUG_ON(num_stripes == 0);
108         return sizeof(struct btrfs_chunk) +
109                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
110 }
111 
112 /*
113  * Runtime (in-memory) states of filesystem
114  */
115 enum {
116         /* Global indicator of serious filesystem errors */
117         BTRFS_FS_STATE_ERROR,
118         /*
119          * Filesystem is being remounted, allow to skip some operations, like
120          * defrag
121          */
122         BTRFS_FS_STATE_REMOUNTING,
123         /* Track if a transaction abort has been reported on this filesystem */
124         BTRFS_FS_STATE_TRANS_ABORTED,
125         /*
126          * Bio operations should be blocked on this filesystem because a source
127          * or target device is being destroyed as part of a device replace
128          */
129         BTRFS_FS_STATE_DEV_REPLACING,
130         /* The btrfs_fs_info created for self-tests */
131         BTRFS_FS_STATE_DUMMY_FS_INFO,
132 };
133 
134 #define BTRFS_BACKREF_REV_MAX           256
135 #define BTRFS_BACKREF_REV_SHIFT         56
136 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
137                                          BTRFS_BACKREF_REV_SHIFT)
138 
139 #define BTRFS_OLD_BACKREF_REV           0
140 #define BTRFS_MIXED_BACKREF_REV         1
141 
142 /*
143  * every tree block (leaf or node) starts with this header.
144  */
145 struct btrfs_header {
146         /* these first four must match the super block */
147         u8 csum[BTRFS_CSUM_SIZE];
148         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
149         __le64 bytenr; /* which block this node is supposed to live in */
150         __le64 flags;
151 
152         /* allowed to be different from the super from here on down */
153         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
154         __le64 generation;
155         __le64 owner;
156         __le32 nritems;
157         u8 level;
158 } __attribute__ ((__packed__));
159 
160 /*
161  * this is a very generous portion of the super block, giving us
162  * room to translate 14 chunks with 3 stripes each.
163  */
164 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
165 
166 /*
167  * just in case we somehow lose the roots and are not able to mount,
168  * we store an array of the roots from previous transactions
169  * in the super.
170  */
171 #define BTRFS_NUM_BACKUP_ROOTS 4
172 struct btrfs_root_backup {
173         __le64 tree_root;
174         __le64 tree_root_gen;
175 
176         __le64 chunk_root;
177         __le64 chunk_root_gen;
178 
179         __le64 extent_root;
180         __le64 extent_root_gen;
181 
182         __le64 fs_root;
183         __le64 fs_root_gen;
184 
185         __le64 dev_root;
186         __le64 dev_root_gen;
187 
188         __le64 csum_root;
189         __le64 csum_root_gen;
190 
191         __le64 total_bytes;
192         __le64 bytes_used;
193         __le64 num_devices;
194         /* future */
195         __le64 unused_64[4];
196 
197         u8 tree_root_level;
198         u8 chunk_root_level;
199         u8 extent_root_level;
200         u8 fs_root_level;
201         u8 dev_root_level;
202         u8 csum_root_level;
203         /* future and to align */
204         u8 unused_8[10];
205 } __attribute__ ((__packed__));
206 
207 /*
208  * the super block basically lists the main trees of the FS
209  * it currently lacks any block count etc etc
210  */
211 struct btrfs_super_block {
212         /* the first 4 fields must match struct btrfs_header */
213         u8 csum[BTRFS_CSUM_SIZE];
214         /* FS specific UUID, visible to user */
215         u8 fsid[BTRFS_FSID_SIZE];
216         __le64 bytenr; /* this block number */
217         __le64 flags;
218 
219         /* allowed to be different from the btrfs_header from here own down */
220         __le64 magic;
221         __le64 generation;
222         __le64 root;
223         __le64 chunk_root;
224         __le64 log_root;
225 
226         /* this will help find the new super based on the log root */
227         __le64 log_root_transid;
228         __le64 total_bytes;
229         __le64 bytes_used;
230         __le64 root_dir_objectid;
231         __le64 num_devices;
232         __le32 sectorsize;
233         __le32 nodesize;
234         __le32 __unused_leafsize;
235         __le32 stripesize;
236         __le32 sys_chunk_array_size;
237         __le64 chunk_root_generation;
238         __le64 compat_flags;
239         __le64 compat_ro_flags;
240         __le64 incompat_flags;
241         __le16 csum_type;
242         u8 root_level;
243         u8 chunk_root_level;
244         u8 log_root_level;
245         struct btrfs_dev_item dev_item;
246 
247         char label[BTRFS_LABEL_SIZE];
248 
249         __le64 cache_generation;
250         __le64 uuid_tree_generation;
251 
252         /* the UUID written into btree blocks */
253         u8 metadata_uuid[BTRFS_FSID_SIZE];
254 
255         /* future expansion */
256         __le64 reserved[28];
257         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
258         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
259 } __attribute__ ((__packed__));
260 
261 /*
262  * Compat flags that we support.  If any incompat flags are set other than the
263  * ones specified below then we will fail to mount
264  */
265 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
266 #define BTRFS_FEATURE_COMPAT_SAFE_SET           0ULL
267 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR         0ULL
268 
269 #define BTRFS_FEATURE_COMPAT_RO_SUPP                    \
270         (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |      \
271          BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
272 
273 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET        0ULL
274 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR      0ULL
275 
276 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
277         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
278          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
279          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
280          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
281          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
282          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
283          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
284          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
285          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
286          BTRFS_FEATURE_INCOMPAT_NO_HOLES        |       \
287          BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
288 
289 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                 \
290         (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
291 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR               0ULL
292 
293 /*
294  * A leaf is full of items. offset and size tell us where to find
295  * the item in the leaf (relative to the start of the data area)
296  */
297 struct btrfs_item {
298         struct btrfs_disk_key key;
299         __le32 offset;
300         __le32 size;
301 } __attribute__ ((__packed__));
302 
303 /*
304  * leaves have an item area and a data area:
305  * [item0, item1....itemN] [free space] [dataN...data1, data0]
306  *
307  * The data is separate from the items to get the keys closer together
308  * during searches.
309  */
310 struct btrfs_leaf {
311         struct btrfs_header header;
312         struct btrfs_item items[];
313 } __attribute__ ((__packed__));
314 
315 /*
316  * all non-leaf blocks are nodes, they hold only keys and pointers to
317  * other blocks
318  */
319 struct btrfs_key_ptr {
320         struct btrfs_disk_key key;
321         __le64 blockptr;
322         __le64 generation;
323 } __attribute__ ((__packed__));
324 
325 struct btrfs_node {
326         struct btrfs_header header;
327         struct btrfs_key_ptr ptrs[];
328 } __attribute__ ((__packed__));
329 
330 /*
331  * btrfs_paths remember the path taken from the root down to the leaf.
332  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
333  * to any other levels that are present.
334  *
335  * The slots array records the index of the item or block pointer
336  * used while walking the tree.
337  */
338 enum { READA_NONE, READA_BACK, READA_FORWARD };
339 struct btrfs_path {
340         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
341         int slots[BTRFS_MAX_LEVEL];
342         /* if there is real range locking, this locks field will change */
343         u8 locks[BTRFS_MAX_LEVEL];
344         u8 reada;
345         /* keep some upper locks as we walk down */
346         u8 lowest_level;
347 
348         /*
349          * set by btrfs_split_item, tells search_slot to keep all locks
350          * and to force calls to keep space in the nodes
351          */
352         unsigned int search_for_split:1;
353         unsigned int keep_locks:1;
354         unsigned int skip_locking:1;
355         unsigned int leave_spinning:1;
356         unsigned int search_commit_root:1;
357         unsigned int need_commit_sem:1;
358         unsigned int skip_release_on_error:1;
359 };
360 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
361                                         sizeof(struct btrfs_item))
362 struct btrfs_dev_replace {
363         u64 replace_state;      /* see #define above */
364         time64_t time_started;  /* seconds since 1-Jan-1970 */
365         time64_t time_stopped;  /* seconds since 1-Jan-1970 */
366         atomic64_t num_write_errors;
367         atomic64_t num_uncorrectable_read_errors;
368 
369         u64 cursor_left;
370         u64 committed_cursor_left;
371         u64 cursor_left_last_write_of_item;
372         u64 cursor_right;
373 
374         u64 cont_reading_from_srcdev_mode;      /* see #define above */
375 
376         int is_valid;
377         int item_needs_writeback;
378         struct btrfs_device *srcdev;
379         struct btrfs_device *tgtdev;
380 
381         struct mutex lock_finishing_cancel_unmount;
382         struct rw_semaphore rwsem;
383 
384         struct btrfs_scrub_progress scrub_progress;
385 
386         struct percpu_counter bio_counter;
387         wait_queue_head_t replace_wait;
388 };
389 
390 /* For raid type sysfs entries */
391 struct raid_kobject {
392         u64 flags;
393         struct kobject kobj;
394         struct list_head list;
395 };
396 
397 struct btrfs_space_info {
398         spinlock_t lock;
399 
400         u64 total_bytes;        /* total bytes in the space,
401                                    this doesn't take mirrors into account */
402         u64 bytes_used;         /* total bytes used,
403                                    this doesn't take mirrors into account */
404         u64 bytes_pinned;       /* total bytes pinned, will be freed when the
405                                    transaction finishes */
406         u64 bytes_reserved;     /* total bytes the allocator has reserved for
407                                    current allocations */
408         u64 bytes_may_use;      /* number of bytes that may be used for
409                                    delalloc/allocations */
410         u64 bytes_readonly;     /* total bytes that are read only */
411 
412         u64 max_extent_size;    /* This will hold the maximum extent size of
413                                    the space info if we had an ENOSPC in the
414                                    allocator. */
415 
416         unsigned int full:1;    /* indicates that we cannot allocate any more
417                                    chunks for this space */
418         unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
419 
420         unsigned int flush:1;           /* set if we are trying to make space */
421 
422         unsigned int force_alloc;       /* set if we need to force a chunk
423                                            alloc for this space */
424 
425         u64 disk_used;          /* total bytes used on disk */
426         u64 disk_total;         /* total bytes on disk, takes mirrors into
427                                    account */
428 
429         u64 flags;
430 
431         /*
432          * bytes_pinned is kept in line with what is actually pinned, as in
433          * we've called update_block_group and dropped the bytes_used counter
434          * and increased the bytes_pinned counter.  However this means that
435          * bytes_pinned does not reflect the bytes that will be pinned once the
436          * delayed refs are flushed, so this counter is inc'ed every time we
437          * call btrfs_free_extent so it is a realtime count of what will be
438          * freed once the transaction is committed.  It will be zeroed every
439          * time the transaction commits.
440          */
441         struct percpu_counter total_bytes_pinned;
442 
443         struct list_head list;
444         /* Protected by the spinlock 'lock'. */
445         struct list_head ro_bgs;
446         struct list_head priority_tickets;
447         struct list_head tickets;
448         /*
449          * tickets_id just indicates the next ticket will be handled, so note
450          * it's not stored per ticket.
451          */
452         u64 tickets_id;
453 
454         struct rw_semaphore groups_sem;
455         /* for block groups in our same type */
456         struct list_head block_groups[BTRFS_NR_RAID_TYPES];
457         wait_queue_head_t wait;
458 
459         struct kobject kobj;
460         struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
461 };
462 
463 /*
464  * Types of block reserves
465  */
466 enum {
467         BTRFS_BLOCK_RSV_GLOBAL,
468         BTRFS_BLOCK_RSV_DELALLOC,
469         BTRFS_BLOCK_RSV_TRANS,
470         BTRFS_BLOCK_RSV_CHUNK,
471         BTRFS_BLOCK_RSV_DELOPS,
472         BTRFS_BLOCK_RSV_DELREFS,
473         BTRFS_BLOCK_RSV_EMPTY,
474         BTRFS_BLOCK_RSV_TEMP,
475 };
476 
477 struct btrfs_block_rsv {
478         u64 size;
479         u64 reserved;
480         struct btrfs_space_info *space_info;
481         spinlock_t lock;
482         unsigned short full;
483         unsigned short type;
484         unsigned short failfast;
485 
486         /*
487          * Qgroup equivalent for @size @reserved
488          *
489          * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
490          * about things like csum size nor how many tree blocks it will need to
491          * reserve.
492          *
493          * Qgroup cares more about net change of the extent usage.
494          *
495          * So for one newly inserted file extent, in worst case it will cause
496          * leaf split and level increase, nodesize for each file extent is
497          * already too much.
498          *
499          * In short, qgroup_size/reserved is the upper limit of possible needed
500          * qgroup metadata reservation.
501          */
502         u64 qgroup_rsv_size;
503         u64 qgroup_rsv_reserved;
504 };
505 
506 /*
507  * free clusters are used to claim free space in relatively large chunks,
508  * allowing us to do less seeky writes. They are used for all metadata
509  * allocations. In ssd_spread mode they are also used for data allocations.
510  */
511 struct btrfs_free_cluster {
512         spinlock_t lock;
513         spinlock_t refill_lock;
514         struct rb_root root;
515 
516         /* largest extent in this cluster */
517         u64 max_size;
518 
519         /* first extent starting offset */
520         u64 window_start;
521 
522         /* We did a full search and couldn't create a cluster */
523         bool fragmented;
524 
525         struct btrfs_block_group_cache *block_group;
526         /*
527          * when a cluster is allocated from a block group, we put the
528          * cluster onto a list in the block group so that it can
529          * be freed before the block group is freed.
530          */
531         struct list_head block_group_list;
532 };
533 
534 enum btrfs_caching_type {
535         BTRFS_CACHE_NO,
536         BTRFS_CACHE_STARTED,
537         BTRFS_CACHE_FAST,
538         BTRFS_CACHE_FINISHED,
539         BTRFS_CACHE_ERROR,
540 };
541 
542 enum btrfs_disk_cache_state {
543         BTRFS_DC_WRITTEN,
544         BTRFS_DC_ERROR,
545         BTRFS_DC_CLEAR,
546         BTRFS_DC_SETUP,
547 };
548 
549 struct btrfs_caching_control {
550         struct list_head list;
551         struct mutex mutex;
552         wait_queue_head_t wait;
553         struct btrfs_work work;
554         struct btrfs_block_group_cache *block_group;
555         u64 progress;
556         refcount_t count;
557 };
558 
559 /* Once caching_thread() finds this much free space, it will wake up waiters. */
560 #define CACHING_CTL_WAKE_UP SZ_2M
561 
562 struct btrfs_io_ctl {
563         void *cur, *orig;
564         struct page *page;
565         struct page **pages;
566         struct btrfs_fs_info *fs_info;
567         struct inode *inode;
568         unsigned long size;
569         int index;
570         int num_pages;
571         int entries;
572         int bitmaps;
573         unsigned check_crcs:1;
574 };
575 
576 /*
577  * Tree to record all locked full stripes of a RAID5/6 block group
578  */
579 struct btrfs_full_stripe_locks_tree {
580         struct rb_root root;
581         struct mutex lock;
582 };
583 
584 struct btrfs_block_group_cache {
585         struct btrfs_key key;
586         struct btrfs_block_group_item item;
587         struct btrfs_fs_info *fs_info;
588         struct inode *inode;
589         spinlock_t lock;
590         u64 pinned;
591         u64 reserved;
592         u64 delalloc_bytes;
593         u64 bytes_super;
594         u64 flags;
595         u64 cache_generation;
596 
597         /*
598          * If the free space extent count exceeds this number, convert the block
599          * group to bitmaps.
600          */
601         u32 bitmap_high_thresh;
602 
603         /*
604          * If the free space extent count drops below this number, convert the
605          * block group back to extents.
606          */
607         u32 bitmap_low_thresh;
608 
609         /*
610          * It is just used for the delayed data space allocation because
611          * only the data space allocation and the relative metadata update
612          * can be done cross the transaction.
613          */
614         struct rw_semaphore data_rwsem;
615 
616         /* for raid56, this is a full stripe, without parity */
617         unsigned long full_stripe_len;
618 
619         unsigned int ro;
620         unsigned int iref:1;
621         unsigned int has_caching_ctl:1;
622         unsigned int removed:1;
623 
624         int disk_cache_state;
625 
626         /* cache tracking stuff */
627         int cached;
628         struct btrfs_caching_control *caching_ctl;
629         u64 last_byte_to_unpin;
630 
631         struct btrfs_space_info *space_info;
632 
633         /* free space cache stuff */
634         struct btrfs_free_space_ctl *free_space_ctl;
635 
636         /* block group cache stuff */
637         struct rb_node cache_node;
638 
639         /* for block groups in the same raid type */
640         struct list_head list;
641 
642         /* usage count */
643         atomic_t count;
644 
645         /* List of struct btrfs_free_clusters for this block group.
646          * Today it will only have one thing on it, but that may change
647          */
648         struct list_head cluster_list;
649 
650         /* For delayed block group creation or deletion of empty block groups */
651         struct list_head bg_list;
652 
653         /* For read-only block groups */
654         struct list_head ro_list;
655 
656         atomic_t trimming;
657 
658         /* For dirty block groups */
659         struct list_head dirty_list;
660         struct list_head io_list;
661 
662         struct btrfs_io_ctl io_ctl;
663 
664         /*
665          * Incremented when doing extent allocations and holding a read lock
666          * on the space_info's groups_sem semaphore.
667          * Decremented when an ordered extent that represents an IO against this
668          * block group's range is created (after it's added to its inode's
669          * root's list of ordered extents) or immediately after the allocation
670          * if it's a metadata extent or fallocate extent (for these cases we
671          * don't create ordered extents).
672          */
673         atomic_t reservations;
674 
675         /*
676          * Incremented while holding the spinlock *lock* by a task checking if
677          * it can perform a nocow write (incremented if the value for the *ro*
678          * field is 0). Decremented by such tasks once they create an ordered
679          * extent or before that if some error happens before reaching that step.
680          * This is to prevent races between block group relocation and nocow
681          * writes through direct IO.
682          */
683         atomic_t nocow_writers;
684 
685         /* Lock for free space tree operations. */
686         struct mutex free_space_lock;
687 
688         /*
689          * Does the block group need to be added to the free space tree?
690          * Protected by free_space_lock.
691          */
692         int needs_free_space;
693 
694         /* Record locked full stripes for RAID5/6 block group */
695         struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
696 };
697 
698 /* delayed seq elem */
699 struct seq_list {
700         struct list_head list;
701         u64 seq;
702 };
703 
704 #define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
705 
706 #define SEQ_LAST        ((u64)-1)
707 
708 enum btrfs_orphan_cleanup_state {
709         ORPHAN_CLEANUP_STARTED  = 1,
710         ORPHAN_CLEANUP_DONE     = 2,
711 };
712 
713 /* used by the raid56 code to lock stripes for read/modify/write */
714 struct btrfs_stripe_hash {
715         struct list_head hash_list;
716         spinlock_t lock;
717 };
718 
719 /* used by the raid56 code to lock stripes for read/modify/write */
720 struct btrfs_stripe_hash_table {
721         struct list_head stripe_cache;
722         spinlock_t cache_lock;
723         int cache_size;
724         struct btrfs_stripe_hash table[];
725 };
726 
727 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
728 
729 void btrfs_init_async_reclaim_work(struct work_struct *work);
730 
731 /* fs_info */
732 struct reloc_control;
733 struct btrfs_device;
734 struct btrfs_fs_devices;
735 struct btrfs_balance_control;
736 struct btrfs_delayed_root;
737 
738 /*
739  * Block group or device which contains an active swapfile. Used for preventing
740  * unsafe operations while a swapfile is active.
741  *
742  * These are sorted on (ptr, inode) (note that a block group or device can
743  * contain more than one swapfile). We compare the pointer values because we
744  * don't actually care what the object is, we just need a quick check whether
745  * the object exists in the rbtree.
746  */
747 struct btrfs_swapfile_pin {
748         struct rb_node node;
749         void *ptr;
750         struct inode *inode;
751         /*
752          * If true, ptr points to a struct btrfs_block_group_cache. Otherwise,
753          * ptr points to a struct btrfs_device.
754          */
755         bool is_block_group;
756 };
757 
758 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
759 
760 enum {
761         BTRFS_FS_BARRIER,
762         BTRFS_FS_CLOSING_START,
763         BTRFS_FS_CLOSING_DONE,
764         BTRFS_FS_LOG_RECOVERING,
765         BTRFS_FS_OPEN,
766         BTRFS_FS_QUOTA_ENABLED,
767         BTRFS_FS_UPDATE_UUID_TREE_GEN,
768         BTRFS_FS_CREATING_FREE_SPACE_TREE,
769         BTRFS_FS_BTREE_ERR,
770         BTRFS_FS_LOG1_ERR,
771         BTRFS_FS_LOG2_ERR,
772         BTRFS_FS_QUOTA_OVERRIDE,
773         /* Used to record internally whether fs has been frozen */
774         BTRFS_FS_FROZEN,
775         /*
776          * Indicate that a whole-filesystem exclusive operation is running
777          * (device replace, resize, device add/delete, balance)
778          */
779         BTRFS_FS_EXCL_OP,
780         /*
781          * To info transaction_kthread we need an immediate commit so it
782          * doesn't need to wait for commit_interval
783          */
784         BTRFS_FS_NEED_ASYNC_COMMIT,
785         /*
786          * Indicate that balance has been set up from the ioctl and is in the
787          * main phase. The fs_info::balance_ctl is initialized.
788          */
789         BTRFS_FS_BALANCE_RUNNING,
790 
791         /* Indicate that the cleaner thread is awake and doing something. */
792         BTRFS_FS_CLEANER_RUNNING,
793 };
794 
795 struct btrfs_fs_info {
796         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
797         unsigned long flags;
798         struct btrfs_root *extent_root;
799         struct btrfs_root *tree_root;
800         struct btrfs_root *chunk_root;
801         struct btrfs_root *dev_root;
802         struct btrfs_root *fs_root;
803         struct btrfs_root *csum_root;
804         struct btrfs_root *quota_root;
805         struct btrfs_root *uuid_root;
806         struct btrfs_root *free_space_root;
807 
808         /* the log root tree is a directory of all the other log roots */
809         struct btrfs_root *log_root_tree;
810 
811         spinlock_t fs_roots_radix_lock;
812         struct radix_tree_root fs_roots_radix;
813 
814         /* block group cache stuff */
815         spinlock_t block_group_cache_lock;
816         u64 first_logical_byte;
817         struct rb_root block_group_cache_tree;
818 
819         /* keep track of unallocated space */
820         atomic64_t free_chunk_space;
821 
822         struct extent_io_tree freed_extents[2];
823         struct extent_io_tree *pinned_extents;
824 
825         /* logical->physical extent mapping */
826         struct btrfs_mapping_tree mapping_tree;
827 
828         /*
829          * block reservation for extent, checksum, root tree and
830          * delayed dir index item
831          */
832         struct btrfs_block_rsv global_block_rsv;
833         /* block reservation for metadata operations */
834         struct btrfs_block_rsv trans_block_rsv;
835         /* block reservation for chunk tree */
836         struct btrfs_block_rsv chunk_block_rsv;
837         /* block reservation for delayed operations */
838         struct btrfs_block_rsv delayed_block_rsv;
839         /* block reservation for delayed refs */
840         struct btrfs_block_rsv delayed_refs_rsv;
841 
842         struct btrfs_block_rsv empty_block_rsv;
843 
844         u64 generation;
845         u64 last_trans_committed;
846         u64 avg_delayed_ref_runtime;
847 
848         /*
849          * this is updated to the current trans every time a full commit
850          * is required instead of the faster short fsync log commits
851          */
852         u64 last_trans_log_full_commit;
853         unsigned long mount_opt;
854         /*
855          * Track requests for actions that need to be done during transaction
856          * commit (like for some mount options).
857          */
858         unsigned long pending_changes;
859         unsigned long compress_type:4;
860         unsigned int compress_level;
861         u32 commit_interval;
862         /*
863          * It is a suggestive number, the read side is safe even it gets a
864          * wrong number because we will write out the data into a regular
865          * extent. The write side(mount/remount) is under ->s_umount lock,
866          * so it is also safe.
867          */
868         u64 max_inline;
869 
870         struct btrfs_transaction *running_transaction;
871         wait_queue_head_t transaction_throttle;
872         wait_queue_head_t transaction_wait;
873         wait_queue_head_t transaction_blocked_wait;
874         wait_queue_head_t async_submit_wait;
875 
876         /*
877          * Used to protect the incompat_flags, compat_flags, compat_ro_flags
878          * when they are updated.
879          *
880          * Because we do not clear the flags for ever, so we needn't use
881          * the lock on the read side.
882          *
883          * We also needn't use the lock when we mount the fs, because
884          * there is no other task which will update the flag.
885          */
886         spinlock_t super_lock;
887         struct btrfs_super_block *super_copy;
888         struct btrfs_super_block *super_for_commit;
889         struct super_block *sb;
890         struct inode *btree_inode;
891         struct mutex tree_log_mutex;
892         struct mutex transaction_kthread_mutex;
893         struct mutex cleaner_mutex;
894         struct mutex chunk_mutex;
895 
896         /*
897          * this is taken to make sure we don't set block groups ro after
898          * the free space cache has been allocated on them
899          */
900         struct mutex ro_block_group_mutex;
901 
902         /* this is used during read/modify/write to make sure
903          * no two ios are trying to mod the same stripe at the same
904          * time
905          */
906         struct btrfs_stripe_hash_table *stripe_hash_table;
907 
908         /*
909          * this protects the ordered operations list only while we are
910          * processing all of the entries on it.  This way we make
911          * sure the commit code doesn't find the list temporarily empty
912          * because another function happens to be doing non-waiting preflush
913          * before jumping into the main commit.
914          */
915         struct mutex ordered_operations_mutex;
916 
917         struct rw_semaphore commit_root_sem;
918 
919         struct rw_semaphore cleanup_work_sem;
920 
921         struct rw_semaphore subvol_sem;
922         struct srcu_struct subvol_srcu;
923 
924         spinlock_t trans_lock;
925         /*
926          * the reloc mutex goes with the trans lock, it is taken
927          * during commit to protect us from the relocation code
928          */
929         struct mutex reloc_mutex;
930 
931         struct list_head trans_list;
932         struct list_head dead_roots;
933         struct list_head caching_block_groups;
934 
935         spinlock_t delayed_iput_lock;
936         struct list_head delayed_iputs;
937         atomic_t nr_delayed_iputs;
938         wait_queue_head_t delayed_iputs_wait;
939 
940         /* this protects tree_mod_seq_list */
941         spinlock_t tree_mod_seq_lock;
942         atomic64_t tree_mod_seq;
943         struct list_head tree_mod_seq_list;
944 
945         /* this protects tree_mod_log */
946         rwlock_t tree_mod_log_lock;
947         struct rb_root tree_mod_log;
948 
949         atomic_t async_delalloc_pages;
950 
951         /*
952          * this is used to protect the following list -- ordered_roots.
953          */
954         spinlock_t ordered_root_lock;
955 
956         /*
957          * all fs/file tree roots in which there are data=ordered extents
958          * pending writeback are added into this list.
959          *
960          * these can span multiple transactions and basically include
961          * every dirty data page that isn't from nodatacow
962          */
963         struct list_head ordered_roots;
964 
965         struct mutex delalloc_root_mutex;
966         spinlock_t delalloc_root_lock;
967         /* all fs/file tree roots that have delalloc inodes. */
968         struct list_head delalloc_roots;
969 
970         /*
971          * there is a pool of worker threads for checksumming during writes
972          * and a pool for checksumming after reads.  This is because readers
973          * can run with FS locks held, and the writers may be waiting for
974          * those locks.  We don't want ordering in the pending list to cause
975          * deadlocks, and so the two are serviced separately.
976          *
977          * A third pool does submit_bio to avoid deadlocking with the other
978          * two
979          */
980         struct btrfs_workqueue *workers;
981         struct btrfs_workqueue *delalloc_workers;
982         struct btrfs_workqueue *flush_workers;
983         struct btrfs_workqueue *endio_workers;
984         struct btrfs_workqueue *endio_meta_workers;
985         struct btrfs_workqueue *endio_raid56_workers;
986         struct btrfs_workqueue *endio_repair_workers;
987         struct btrfs_workqueue *rmw_workers;
988         struct btrfs_workqueue *endio_meta_write_workers;
989         struct btrfs_workqueue *endio_write_workers;
990         struct btrfs_workqueue *endio_freespace_worker;
991         struct btrfs_workqueue *submit_workers;
992         struct btrfs_workqueue *caching_workers;
993         struct btrfs_workqueue *readahead_workers;
994 
995         /*
996          * fixup workers take dirty pages that didn't properly go through
997          * the cow mechanism and make them safe to write.  It happens
998          * for the sys_munmap function call path
999          */
1000         struct btrfs_workqueue *fixup_workers;
1001         struct btrfs_workqueue *delayed_workers;
1002 
1003         /* the extent workers do delayed refs on the extent allocation tree */
1004         struct btrfs_workqueue *extent_workers;
1005         struct task_struct *transaction_kthread;
1006         struct task_struct *cleaner_kthread;
1007         u32 thread_pool_size;
1008 
1009         struct kobject *space_info_kobj;
1010         struct list_head pending_raid_kobjs;
1011         spinlock_t pending_raid_kobjs_lock; /* uncontended */
1012 
1013         u64 total_pinned;
1014 
1015         /* used to keep from writing metadata until there is a nice batch */
1016         struct percpu_counter dirty_metadata_bytes;
1017         struct percpu_counter delalloc_bytes;
1018         s32 dirty_metadata_batch;
1019         s32 delalloc_batch;
1020 
1021         struct list_head dirty_cowonly_roots;
1022 
1023         struct btrfs_fs_devices *fs_devices;
1024 
1025         /*
1026          * The space_info list is effectively read only after initial
1027          * setup.  It is populated at mount time and cleaned up after
1028          * all block groups are removed.  RCU is used to protect it.
1029          */
1030         struct list_head space_info;
1031 
1032         struct btrfs_space_info *data_sinfo;
1033 
1034         struct reloc_control *reloc_ctl;
1035 
1036         /* data_alloc_cluster is only used in ssd_spread mode */
1037         struct btrfs_free_cluster data_alloc_cluster;
1038 
1039         /* all metadata allocations go through this cluster */
1040         struct btrfs_free_cluster meta_alloc_cluster;
1041 
1042         /* auto defrag inodes go here */
1043         spinlock_t defrag_inodes_lock;
1044         struct rb_root defrag_inodes;
1045         atomic_t defrag_running;
1046 
1047         /* Used to protect avail_{data, metadata, system}_alloc_bits */
1048         seqlock_t profiles_lock;
1049         /*
1050          * these three are in extended format (availability of single
1051          * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
1052          * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
1053          */
1054         u64 avail_data_alloc_bits;
1055         u64 avail_metadata_alloc_bits;
1056         u64 avail_system_alloc_bits;
1057 
1058         /* restriper state */
1059         spinlock_t balance_lock;
1060         struct mutex balance_mutex;
1061         atomic_t balance_pause_req;
1062         atomic_t balance_cancel_req;
1063         struct btrfs_balance_control *balance_ctl;
1064         wait_queue_head_t balance_wait_q;
1065 
1066         u32 data_chunk_allocations;
1067         u32 metadata_ratio;
1068 
1069         void *bdev_holder;
1070 
1071         /* private scrub information */
1072         struct mutex scrub_lock;
1073         atomic_t scrubs_running;
1074         atomic_t scrub_pause_req;
1075         atomic_t scrubs_paused;
1076         atomic_t scrub_cancel_req;
1077         wait_queue_head_t scrub_pause_wait;
1078         /*
1079          * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
1080          * running.
1081          */
1082         refcount_t scrub_workers_refcnt;
1083         struct btrfs_workqueue *scrub_workers;
1084         struct btrfs_workqueue *scrub_wr_completion_workers;
1085         struct btrfs_workqueue *scrub_parity_workers;
1086 
1087 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1088         u32 check_integrity_print_mask;
1089 #endif
1090         /* is qgroup tracking in a consistent state? */
1091         u64 qgroup_flags;
1092 
1093         /* holds configuration and tracking. Protected by qgroup_lock */
1094         struct rb_root qgroup_tree;
1095         struct rb_root qgroup_op_tree;
1096         spinlock_t qgroup_lock;
1097         spinlock_t qgroup_op_lock;
1098         atomic_t qgroup_op_seq;
1099 
1100         /*
1101          * used to avoid frequently calling ulist_alloc()/ulist_free()
1102          * when doing qgroup accounting, it must be protected by qgroup_lock.
1103          */
1104         struct ulist *qgroup_ulist;
1105 
1106         /* protect user change for quota operations */
1107         struct mutex qgroup_ioctl_lock;
1108 
1109         /* list of dirty qgroups to be written at next commit */
1110         struct list_head dirty_qgroups;
1111 
1112         /* used by qgroup for an efficient tree traversal */
1113         u64 qgroup_seq;
1114 
1115         /* qgroup rescan items */
1116         struct mutex qgroup_rescan_lock; /* protects the progress item */
1117         struct btrfs_key qgroup_rescan_progress;
1118         struct btrfs_workqueue *qgroup_rescan_workers;
1119         struct completion qgroup_rescan_completion;
1120         struct btrfs_work qgroup_rescan_work;
1121         bool qgroup_rescan_running;     /* protected by qgroup_rescan_lock */
1122 
1123         /* filesystem state */
1124         unsigned long fs_state;
1125 
1126         struct btrfs_delayed_root *delayed_root;
1127 
1128         /* readahead tree */
1129         spinlock_t reada_lock;
1130         struct radix_tree_root reada_tree;
1131 
1132         /* readahead works cnt */
1133         atomic_t reada_works_cnt;
1134 
1135         /* Extent buffer radix tree */
1136         spinlock_t buffer_lock;
1137         struct radix_tree_root buffer_radix;
1138 
1139         /* next backup root to be overwritten */
1140         int backup_root_index;
1141 
1142         /* device replace state */
1143         struct btrfs_dev_replace dev_replace;
1144 
1145         struct semaphore uuid_tree_rescan_sem;
1146 
1147         /* Used to reclaim the metadata space in the background. */
1148         struct work_struct async_reclaim_work;
1149 
1150         spinlock_t unused_bgs_lock;
1151         struct list_head unused_bgs;
1152         struct mutex unused_bg_unpin_mutex;
1153         struct mutex delete_unused_bgs_mutex;
1154 
1155         /*
1156          * Chunks that can't be freed yet (under a trim/discard operation)
1157          * and will be latter freed. Protected by fs_info->chunk_mutex.
1158          */
1159         struct list_head pinned_chunks;
1160 
1161         /* Cached block sizes */
1162         u32 nodesize;
1163         u32 sectorsize;
1164         u32 stripesize;
1165 
1166         /* Block groups and devices containing active swapfiles. */
1167         spinlock_t swapfile_pins_lock;
1168         struct rb_root swapfile_pins;
1169 
1170 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1171         spinlock_t ref_verify_lock;
1172         struct rb_root block_tree;
1173 #endif
1174 };
1175 
1176 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1177 {
1178         return sb->s_fs_info;
1179 }
1180 
1181 struct btrfs_subvolume_writers {
1182         struct percpu_counter   counter;
1183         wait_queue_head_t       wait;
1184 };
1185 
1186 /*
1187  * The state of btrfs root
1188  */
1189 enum {
1190         /*
1191          * btrfs_record_root_in_trans is a multi-step process, and it can race
1192          * with the balancing code.   But the race is very small, and only the
1193          * first time the root is added to each transaction.  So IN_TRANS_SETUP
1194          * is used to tell us when more checks are required
1195          */
1196         BTRFS_ROOT_IN_TRANS_SETUP,
1197         BTRFS_ROOT_REF_COWS,
1198         BTRFS_ROOT_TRACK_DIRTY,
1199         BTRFS_ROOT_IN_RADIX,
1200         BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1201         BTRFS_ROOT_DEFRAG_RUNNING,
1202         BTRFS_ROOT_FORCE_COW,
1203         BTRFS_ROOT_MULTI_LOG_TASKS,
1204         BTRFS_ROOT_DIRTY,
1205         BTRFS_ROOT_DELETING,
1206 
1207         /*
1208          * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1209          *
1210          * Set for the subvolume tree owning the reloc tree.
1211          */
1212         BTRFS_ROOT_DEAD_RELOC_TREE,
1213         /* Mark dead root stored on device whose cleanup needs to be resumed */
1214         BTRFS_ROOT_DEAD_TREE,
1215 };
1216 
1217 /*
1218  * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1219  * code. For detail check comment in fs/btrfs/qgroup.c.
1220  */
1221 struct btrfs_qgroup_swapped_blocks {
1222         spinlock_t lock;
1223         /* RM_EMPTY_ROOT() of above blocks[] */
1224         bool swapped;
1225         struct rb_root blocks[BTRFS_MAX_LEVEL];
1226 };
1227 
1228 /*
1229  * in ram representation of the tree.  extent_root is used for all allocations
1230  * and for the extent tree extent_root root.
1231  */
1232 struct btrfs_root {
1233         struct extent_buffer *node;
1234 
1235         struct extent_buffer *commit_root;
1236         struct btrfs_root *log_root;
1237         struct btrfs_root *reloc_root;
1238 
1239         unsigned long state;
1240         struct btrfs_root_item root_item;
1241         struct btrfs_key root_key;
1242         struct btrfs_fs_info *fs_info;
1243         struct extent_io_tree dirty_log_pages;
1244 
1245         struct mutex objectid_mutex;
1246 
1247         spinlock_t accounting_lock;
1248         struct btrfs_block_rsv *block_rsv;
1249 
1250         /* free ino cache stuff */
1251         struct btrfs_free_space_ctl *free_ino_ctl;
1252         enum btrfs_caching_type ino_cache_state;
1253         spinlock_t ino_cache_lock;
1254         wait_queue_head_t ino_cache_wait;
1255         struct btrfs_free_space_ctl *free_ino_pinned;
1256         u64 ino_cache_progress;
1257         struct inode *ino_cache_inode;
1258 
1259         struct mutex log_mutex;
1260         wait_queue_head_t log_writer_wait;
1261         wait_queue_head_t log_commit_wait[2];
1262         struct list_head log_ctxs[2];
1263         atomic_t log_writers;
1264         atomic_t log_commit[2];
1265         atomic_t log_batch;
1266         int log_transid;
1267         /* No matter the commit succeeds or not*/
1268         int log_transid_committed;
1269         /* Just be updated when the commit succeeds. */
1270         int last_log_commit;
1271         pid_t log_start_pid;
1272 
1273         u64 last_trans;
1274 
1275         u32 type;
1276 
1277         u64 highest_objectid;
1278 
1279         u64 defrag_trans_start;
1280         struct btrfs_key defrag_progress;
1281         struct btrfs_key defrag_max;
1282 
1283         /* the dirty list is only used by non-reference counted roots */
1284         struct list_head dirty_list;
1285 
1286         struct list_head root_list;
1287 
1288         spinlock_t log_extents_lock[2];
1289         struct list_head logged_list[2];
1290 
1291         int orphan_cleanup_state;
1292 
1293         spinlock_t inode_lock;
1294         /* red-black tree that keeps track of in-memory inodes */
1295         struct rb_root inode_tree;
1296 
1297         /*
1298          * radix tree that keeps track of delayed nodes of every inode,
1299          * protected by inode_lock
1300          */
1301         struct radix_tree_root delayed_nodes_tree;
1302         /*
1303          * right now this just gets used so that a root has its own devid
1304          * for stat.  It may be used for more later
1305          */
1306         dev_t anon_dev;
1307 
1308         spinlock_t root_item_lock;
1309         refcount_t refs;
1310 
1311         struct mutex delalloc_mutex;
1312         spinlock_t delalloc_lock;
1313         /*
1314          * all of the inodes that have delalloc bytes.  It is possible for
1315          * this list to be empty even when there is still dirty data=ordered
1316          * extents waiting to finish IO.
1317          */
1318         struct list_head delalloc_inodes;
1319         struct list_head delalloc_root;
1320         u64 nr_delalloc_inodes;
1321 
1322         struct mutex ordered_extent_mutex;
1323         /*
1324          * this is used by the balancing code to wait for all the pending
1325          * ordered extents
1326          */
1327         spinlock_t ordered_extent_lock;
1328 
1329         /*
1330          * all of the data=ordered extents pending writeback
1331          * these can span multiple transactions and basically include
1332          * every dirty data page that isn't from nodatacow
1333          */
1334         struct list_head ordered_extents;
1335         struct list_head ordered_root;
1336         u64 nr_ordered_extents;
1337 
1338         /*
1339          * Not empty if this subvolume root has gone through tree block swap
1340          * (relocation)
1341          *
1342          * Will be used by reloc_control::dirty_subvol_roots.
1343          */
1344         struct list_head reloc_dirty_list;
1345 
1346         /*
1347          * Number of currently running SEND ioctls to prevent
1348          * manipulation with the read-only status via SUBVOL_SETFLAGS
1349          */
1350         int send_in_progress;
1351         /*
1352          * Number of currently running deduplication operations that have a
1353          * destination inode belonging to this root. Protected by the lock
1354          * root_item_lock.
1355          */
1356         int dedupe_in_progress;
1357         struct btrfs_subvolume_writers *subv_writers;
1358         atomic_t will_be_snapshotted;
1359         atomic_t snapshot_force_cow;
1360 
1361         /* For qgroup metadata reserved space */
1362         spinlock_t qgroup_meta_rsv_lock;
1363         u64 qgroup_meta_rsv_pertrans;
1364         u64 qgroup_meta_rsv_prealloc;
1365 
1366         /* Number of active swapfiles */
1367         atomic_t nr_swapfiles;
1368 
1369         /* Record pairs of swapped blocks for qgroup */
1370         struct btrfs_qgroup_swapped_blocks swapped_blocks;
1371 
1372 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1373         u64 alloc_bytenr;
1374 #endif
1375 };
1376 
1377 struct btrfs_file_private {
1378         void *filldir_buf;
1379 };
1380 
1381 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1382 {
1383         return btrfs_sb(inode->i_sb)->sectorsize;
1384 }
1385 
1386 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1387 {
1388 
1389         return info->nodesize - sizeof(struct btrfs_header);
1390 }
1391 
1392 #define BTRFS_LEAF_DATA_OFFSET          offsetof(struct btrfs_leaf, items)
1393 
1394 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1395 {
1396         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1397 }
1398 
1399 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1400 {
1401         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1402 }
1403 
1404 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1405                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1406 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1407 {
1408         return BTRFS_MAX_ITEM_SIZE(info) -
1409                BTRFS_FILE_EXTENT_INLINE_DATA_START;
1410 }
1411 
1412 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1413 {
1414         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1415 }
1416 
1417 /*
1418  * Flags for mount options.
1419  *
1420  * Note: don't forget to add new options to btrfs_show_options()
1421  */
1422 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
1423 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
1424 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1425 #define BTRFS_MOUNT_SSD                 (1 << 3)
1426 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
1427 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
1428 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1429 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1430 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1431 #define BTRFS_MOUNT_NOSSD               (1 << 9)
1432 #define BTRFS_MOUNT_DISCARD             (1 << 10)
1433 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1434 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1435 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1436 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1437 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1438 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1439 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1440 #define BTRFS_MOUNT_USEBACKUPROOT       (1 << 18)
1441 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1442 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1443 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1444 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1445 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
1446 #define BTRFS_MOUNT_FRAGMENT_DATA       (1 << 24)
1447 #define BTRFS_MOUNT_FRAGMENT_METADATA   (1 << 25)
1448 #define BTRFS_MOUNT_FREE_SPACE_TREE     (1 << 26)
1449 #define BTRFS_MOUNT_NOLOGREPLAY         (1 << 27)
1450 #define BTRFS_MOUNT_REF_VERIFY          (1 << 28)
1451 
1452 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
1453 #define BTRFS_DEFAULT_MAX_INLINE        (2048)
1454 
1455 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1456 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1457 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
1458 #define btrfs_test_opt(fs_info, opt)    ((fs_info)->mount_opt & \
1459                                          BTRFS_MOUNT_##opt)
1460 
1461 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                  \
1462 {                                                                       \
1463         if (!btrfs_test_opt(fs_info, opt))                              \
1464                 btrfs_info(fs_info, fmt, ##args);                       \
1465         btrfs_set_opt(fs_info->mount_opt, opt);                         \
1466 }
1467 
1468 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)                \
1469 {                                                                       \
1470         if (btrfs_test_opt(fs_info, opt))                               \
1471                 btrfs_info(fs_info, fmt, ##args);                       \
1472         btrfs_clear_opt(fs_info->mount_opt, opt);                       \
1473 }
1474 
1475 #ifdef CONFIG_BTRFS_DEBUG
1476 static inline int
1477 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1478 {
1479         struct btrfs_fs_info *fs_info = block_group->fs_info;
1480 
1481         return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1482                 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1483                (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1484                 block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1485 }
1486 #endif
1487 
1488 /*
1489  * Requests for changes that need to be done during transaction commit.
1490  *
1491  * Internal mount options that are used for special handling of the real
1492  * mount options (eg. cannot be set during remount and have to be set during
1493  * transaction commit)
1494  */
1495 
1496 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
1497 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
1498 #define BTRFS_PENDING_COMMIT                    (2)
1499 
1500 #define btrfs_test_pending(info, opt)   \
1501         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1502 #define btrfs_set_pending(info, opt)    \
1503         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1504 #define btrfs_clear_pending(info, opt)  \
1505         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1506 
1507 /*
1508  * Helpers for setting pending mount option changes.
1509  *
1510  * Expects corresponding macros
1511  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1512  */
1513 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1514 do {                                                                   \
1515        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1516                btrfs_info((info), fmt, ##args);                        \
1517                btrfs_set_pending((info), SET_##opt);                   \
1518                btrfs_clear_pending((info), CLEAR_##opt);               \
1519        }                                                               \
1520 } while(0)
1521 
1522 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1523 do {                                                                   \
1524        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1525                btrfs_info((info), fmt, ##args);                        \
1526                btrfs_set_pending((info), CLEAR_##opt);                 \
1527                btrfs_clear_pending((info), SET_##opt);                 \
1528        }                                                               \
1529 } while(0)
1530 
1531 /*
1532  * Inode flags
1533  */
1534 #define BTRFS_INODE_NODATASUM           (1 << 0)
1535 #define BTRFS_INODE_NODATACOW           (1 << 1)
1536 #define BTRFS_INODE_READONLY            (1 << 2)
1537 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1538 #define BTRFS_INODE_PREALLOC            (1 << 4)
1539 #define BTRFS_INODE_SYNC                (1 << 5)
1540 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1541 #define BTRFS_INODE_APPEND              (1 << 7)
1542 #define BTRFS_INODE_NODUMP              (1 << 8)
1543 #define BTRFS_INODE_NOATIME             (1 << 9)
1544 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1545 #define BTRFS_INODE_COMPRESS            (1 << 11)
1546 
1547 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1548 
1549 struct btrfs_map_token {
1550         const struct extent_buffer *eb;
1551         char *kaddr;
1552         unsigned long offset;
1553 };
1554 
1555 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1556                                 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1557 
1558 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1559 {
1560         token->kaddr = NULL;
1561 }
1562 
1563 /* some macros to generate set/get functions for the struct fields.  This
1564  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1565  * one for u8:
1566  */
1567 #define le8_to_cpu(v) (v)
1568 #define cpu_to_le8(v) (v)
1569 #define __le8 u8
1570 
1571 #define read_eb_member(eb, ptr, type, member, result) (\
1572         read_extent_buffer(eb, (char *)(result),                        \
1573                            ((unsigned long)(ptr)) +                     \
1574                             offsetof(type, member),                     \
1575                            sizeof(((type *)0)->member)))
1576 
1577 #define write_eb_member(eb, ptr, type, member, result) (\
1578         write_extent_buffer(eb, (char *)(result),                       \
1579                            ((unsigned long)(ptr)) +                     \
1580                             offsetof(type, member),                     \
1581                            sizeof(((type *)0)->member)))
1582 
1583 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1584 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,          \
1585                                const void *ptr, unsigned long off,      \
1586                                struct btrfs_map_token *token);          \
1587 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,  \
1588                             unsigned long off, u##bits val,             \
1589                             struct btrfs_map_token *token);             \
1590 static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,  \
1591                                        const void *ptr,                 \
1592                                        unsigned long off)               \
1593 {                                                                       \
1594         return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
1595 }                                                                       \
1596 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
1597                                     unsigned long off, u##bits val)     \
1598 {                                                                       \
1599        btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
1600 }
1601 
1602 DECLARE_BTRFS_SETGET_BITS(8)
1603 DECLARE_BTRFS_SETGET_BITS(16)
1604 DECLARE_BTRFS_SETGET_BITS(32)
1605 DECLARE_BTRFS_SETGET_BITS(64)
1606 
1607 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1608 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1609                                    const type *s)                       \
1610 {                                                                       \
1611         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1612         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1613 }                                                                       \
1614 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1615                                     u##bits val)                        \
1616 {                                                                       \
1617         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1618         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1619 }                                                                       \
1620 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1621                                          const type *s,                 \
1622                                          struct btrfs_map_token *token) \
1623 {                                                                       \
1624         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1625         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1626 }                                                                       \
1627 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1628                                           type *s, u##bits val,         \
1629                                          struct btrfs_map_token *token) \
1630 {                                                                       \
1631         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1632         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1633 }
1634 
1635 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1636 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1637 {                                                                       \
1638         const type *p = page_address(eb->pages[0]);                     \
1639         u##bits res = le##bits##_to_cpu(p->member);                     \
1640         return res;                                                     \
1641 }                                                                       \
1642 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1643                                     u##bits val)                        \
1644 {                                                                       \
1645         type *p = page_address(eb->pages[0]);                           \
1646         p->member = cpu_to_le##bits(val);                               \
1647 }
1648 
1649 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1650 static inline u##bits btrfs_##name(const type *s)                       \
1651 {                                                                       \
1652         return le##bits##_to_cpu(s->member);                            \
1653 }                                                                       \
1654 static inline void btrfs_set_##name(type *s, u##bits val)               \
1655 {                                                                       \
1656         s->member = cpu_to_le##bits(val);                               \
1657 }
1658 
1659 
1660 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1661                                            struct btrfs_dev_item *s)
1662 {
1663         BUILD_BUG_ON(sizeof(u64) !=
1664                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1665         return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1666                                             total_bytes));
1667 }
1668 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1669                                                 struct btrfs_dev_item *s,
1670                                                 u64 val)
1671 {
1672         BUILD_BUG_ON(sizeof(u64) !=
1673                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1674         WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1675         btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1676 }
1677 
1678 
1679 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1680 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1681 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1682 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1683 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1684                    start_offset, 64);
1685 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1686 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1687 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1688 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1689 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1690 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1691 
1692 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1693 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1694                          total_bytes, 64);
1695 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1696                          bytes_used, 64);
1697 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1698                          io_align, 32);
1699 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1700                          io_width, 32);
1701 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1702                          sector_size, 32);
1703 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1704 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1705                          dev_group, 32);
1706 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1707                          seek_speed, 8);
1708 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1709                          bandwidth, 8);
1710 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1711                          generation, 64);
1712 
1713 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1714 {
1715         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1716 }
1717 
1718 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1719 {
1720         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1721 }
1722 
1723 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1724 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1725 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1726 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1727 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1728 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1729 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1730 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1731 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1732 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1733 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1734 
1735 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1736 {
1737         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1738 }
1739 
1740 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1741 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1742 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1743                          stripe_len, 64);
1744 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1745                          io_align, 32);
1746 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1747                          io_width, 32);
1748 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1749                          sector_size, 32);
1750 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1751 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1752                          num_stripes, 16);
1753 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1754                          sub_stripes, 16);
1755 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1756 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1757 
1758 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1759                                                    int nr)
1760 {
1761         unsigned long offset = (unsigned long)c;
1762         offset += offsetof(struct btrfs_chunk, stripe);
1763         offset += nr * sizeof(struct btrfs_stripe);
1764         return (struct btrfs_stripe *)offset;
1765 }
1766 
1767 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1768 {
1769         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1770 }
1771 
1772 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1773                                          struct btrfs_chunk *c, int nr)
1774 {
1775         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1776 }
1777 
1778 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1779                                          struct btrfs_chunk *c, int nr)
1780 {
1781         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1782 }
1783 
1784 /* struct btrfs_block_group_item */
1785 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1786                          used, 64);
1787 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1788                          used, 64);
1789 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1790                         struct btrfs_block_group_item, chunk_objectid, 64);
1791 
1792 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1793                    struct btrfs_block_group_item, chunk_objectid, 64);
1794 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1795                    struct btrfs_block_group_item, flags, 64);
1796 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1797                         struct btrfs_block_group_item, flags, 64);
1798 
1799 /* struct btrfs_free_space_info */
1800 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1801                    extent_count, 32);
1802 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1803 
1804 /* struct btrfs_inode_ref */
1805 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1806 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1807 
1808 /* struct btrfs_inode_extref */
1809 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1810                    parent_objectid, 64);
1811 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1812                    name_len, 16);
1813 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1814 
1815 /* struct btrfs_inode_item */
1816 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1817 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1818 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1819 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1820 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1821 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1822 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1823 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1824 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1825 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1826 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1827 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1828 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1829                          generation, 64);
1830 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1831                          sequence, 64);
1832 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1833                          transid, 64);
1834 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1835 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1836                          nbytes, 64);
1837 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1838                          block_group, 64);
1839 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1840 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1841 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1842 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1843 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1844 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1845 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1846 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1847 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1848 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1849 
1850 /* struct btrfs_dev_extent */
1851 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1852                    chunk_tree, 64);
1853 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1854                    chunk_objectid, 64);
1855 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1856                    chunk_offset, 64);
1857 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1858 
1859 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1860 {
1861         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1862         return (unsigned long)dev + ptr;
1863 }
1864 
1865 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1866 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1867                    generation, 64);
1868 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1869 
1870 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1871 
1872 
1873 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1874 
1875 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1876                                         struct btrfs_tree_block_info *item,
1877                                         struct btrfs_disk_key *key)
1878 {
1879         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1880 }
1881 
1882 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1883                                             struct btrfs_tree_block_info *item,
1884                                             struct btrfs_disk_key *key)
1885 {
1886         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1887 }
1888 
1889 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1890                    root, 64);
1891 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1892                    objectid, 64);
1893 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1894                    offset, 64);
1895 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1896                    count, 32);
1897 
1898 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1899                    count, 32);
1900 
1901 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1902                    type, 8);
1903 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1904                    offset, 64);
1905 
1906 static inline u32 btrfs_extent_inline_ref_size(int type)
1907 {
1908         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1909             type == BTRFS_SHARED_BLOCK_REF_KEY)
1910                 return sizeof(struct btrfs_extent_inline_ref);
1911         if (type == BTRFS_SHARED_DATA_REF_KEY)
1912                 return sizeof(struct btrfs_shared_data_ref) +
1913                        sizeof(struct btrfs_extent_inline_ref);
1914         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1915                 return sizeof(struct btrfs_extent_data_ref) +
1916                        offsetof(struct btrfs_extent_inline_ref, offset);
1917         return 0;
1918 }
1919 
1920 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1921 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1922                    generation, 64);
1923 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1924 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1925 
1926 /* struct btrfs_node */
1927 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1928 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1929 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1930                          blockptr, 64);
1931 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1932                          generation, 64);
1933 
1934 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1935 {
1936         unsigned long ptr;
1937         ptr = offsetof(struct btrfs_node, ptrs) +
1938                 sizeof(struct btrfs_key_ptr) * nr;
1939         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1940 }
1941 
1942 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1943                                            int nr, u64 val)
1944 {
1945         unsigned long ptr;
1946         ptr = offsetof(struct btrfs_node, ptrs) +
1947                 sizeof(struct btrfs_key_ptr) * nr;
1948         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1949 }
1950 
1951 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1952 {
1953         unsigned long ptr;
1954         ptr = offsetof(struct btrfs_node, ptrs) +
1955                 sizeof(struct btrfs_key_ptr) * nr;
1956         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1957 }
1958 
1959 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1960                                                  int nr, u64 val)
1961 {
1962         unsigned long ptr;
1963         ptr = offsetof(struct btrfs_node, ptrs) +
1964                 sizeof(struct btrfs_key_ptr) * nr;
1965         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1966 }
1967 
1968 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1969 {
1970         return offsetof(struct btrfs_node, ptrs) +
1971                 sizeof(struct btrfs_key_ptr) * nr;
1972 }
1973 
1974 void btrfs_node_key(const struct extent_buffer *eb,
1975                     struct btrfs_disk_key *disk_key, int nr);
1976 
1977 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1978                                       struct btrfs_disk_key *disk_key, int nr)
1979 {
1980         unsigned long ptr;
1981         ptr = btrfs_node_key_ptr_offset(nr);
1982         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1983                        struct btrfs_key_ptr, key, disk_key);
1984 }
1985 
1986 /* struct btrfs_item */
1987 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1988 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1989 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1990 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1991 
1992 static inline unsigned long btrfs_item_nr_offset(int nr)
1993 {
1994         return offsetof(struct btrfs_leaf, items) +
1995                 sizeof(struct btrfs_item) * nr;
1996 }
1997 
1998 static inline struct btrfs_item *btrfs_item_nr(int nr)
1999 {
2000         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
2001 }
2002 
2003 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
2004                                  struct btrfs_item *item)
2005 {
2006         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
2007 }
2008 
2009 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
2010 {
2011         return btrfs_item_end(eb, btrfs_item_nr(nr));
2012 }
2013 
2014 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
2015 {
2016         return btrfs_item_offset(eb, btrfs_item_nr(nr));
2017 }
2018 
2019 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
2020 {
2021         return btrfs_item_size(eb, btrfs_item_nr(nr));
2022 }
2023 
2024 static inline void btrfs_item_key(const struct extent_buffer *eb,
2025                            struct btrfs_disk_key *disk_key, int nr)
2026 {
2027         struct btrfs_item *item = btrfs_item_nr(nr);
2028         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2029 }
2030 
2031 static inline void btrfs_set_item_key(struct extent_buffer *eb,
2032                                struct btrfs_disk_key *disk_key, int nr)
2033 {
2034         struct btrfs_item *item = btrfs_item_nr(nr);
2035         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2036 }
2037 
2038 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2039 
2040 /*
2041  * struct btrfs_root_ref
2042  */
2043 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2044 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2045 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2046 
2047 /* struct btrfs_dir_item */
2048 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2049 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2050 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2051 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2052 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2053 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2054                          data_len, 16);
2055 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2056                          name_len, 16);
2057 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2058                          transid, 64);
2059 
2060 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2061                                       const struct btrfs_dir_item *item,
2062                                       struct btrfs_disk_key *key)
2063 {
2064         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2065 }
2066 
2067 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2068                                           struct btrfs_dir_item *item,
2069                                           const struct btrfs_disk_key *key)
2070 {
2071         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2072 }
2073 
2074 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2075                    num_entries, 64);
2076 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2077                    num_bitmaps, 64);
2078 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2079                    generation, 64);
2080 
2081 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2082                                         const struct btrfs_free_space_header *h,
2083                                         struct btrfs_disk_key *key)
2084 {
2085         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2086 }
2087 
2088 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2089                                             struct btrfs_free_space_header *h,
2090                                             const struct btrfs_disk_key *key)
2091 {
2092         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2093 }
2094 
2095 /* struct btrfs_disk_key */
2096 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2097                          objectid, 64);
2098 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2099 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2100 
2101 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2102                                          const struct btrfs_disk_key *disk)
2103 {
2104         cpu->offset = le64_to_cpu(disk->offset);
2105         cpu->type = disk->type;
2106         cpu->objectid = le64_to_cpu(disk->objectid);
2107 }
2108 
2109 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2110                                          const struct btrfs_key *cpu)
2111 {
2112         disk->offset = cpu_to_le64(cpu->offset);
2113         disk->type = cpu->type;
2114         disk->objectid = cpu_to_le64(cpu->objectid);
2115 }
2116 
2117 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2118                                          struct btrfs_key *key, int nr)
2119 {
2120         struct btrfs_disk_key disk_key;
2121         btrfs_node_key(eb, &disk_key, nr);
2122         btrfs_disk_key_to_cpu(key, &disk_key);
2123 }
2124 
2125 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2126                                          struct btrfs_key *key, int nr)
2127 {
2128         struct btrfs_disk_key disk_key;
2129         btrfs_item_key(eb, &disk_key, nr);
2130         btrfs_disk_key_to_cpu(key, &disk_key);
2131 }
2132 
2133 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2134                                              const struct btrfs_dir_item *item,
2135                                              struct btrfs_key *key)
2136 {
2137         struct btrfs_disk_key disk_key;
2138         btrfs_dir_item_key(eb, item, &disk_key);
2139         btrfs_disk_key_to_cpu(key, &disk_key);
2140 }
2141 
2142 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2143 {
2144         return key->type;
2145 }
2146 
2147 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2148 {
2149         key->type = val;
2150 }
2151 
2152 /* struct btrfs_header */
2153 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2154 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2155                           generation, 64);
2156 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2157 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2158 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2159 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2160 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2161                          generation, 64);
2162 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2163 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2164                          nritems, 32);
2165 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2166 
2167 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2168 {
2169         return (btrfs_header_flags(eb) & flag) == flag;
2170 }
2171 
2172 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2173 {
2174         u64 flags = btrfs_header_flags(eb);
2175         btrfs_set_header_flags(eb, flags | flag);
2176         return (flags & flag) == flag;
2177 }
2178 
2179 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2180 {
2181         u64 flags = btrfs_header_flags(eb);
2182         btrfs_set_header_flags(eb, flags & ~flag);
2183         return (flags & flag) == flag;
2184 }
2185 
2186 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2187 {
2188         u64 flags = btrfs_header_flags(eb);
2189         return flags >> BTRFS_BACKREF_REV_SHIFT;
2190 }
2191 
2192 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2193                                                 int rev)
2194 {
2195         u64 flags = btrfs_header_flags(eb);
2196         flags &= ~BTRFS_BACKREF_REV_MASK;
2197         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2198         btrfs_set_header_flags(eb, flags);
2199 }
2200 
2201 static inline unsigned long btrfs_header_fsid(void)
2202 {
2203         return offsetof(struct btrfs_header, fsid);
2204 }
2205 
2206 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
2207 {
2208         return offsetof(struct btrfs_header, chunk_tree_uuid);
2209 }
2210 
2211 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2212 {
2213         return btrfs_header_level(eb) == 0;
2214 }
2215 
2216 /* struct btrfs_root_item */
2217 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2218                    generation, 64);
2219 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2220 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2221 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2222 
2223 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2224                          generation, 64);
2225 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2226 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2227 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2228 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2229 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2230 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2231 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2232 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2233                          last_snapshot, 64);
2234 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2235                          generation_v2, 64);
2236 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2237                          ctransid, 64);
2238 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2239                          otransid, 64);
2240 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2241                          stransid, 64);
2242 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2243                          rtransid, 64);
2244 
2245 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2246 {
2247         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2248 }
2249 
2250 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2251 {
2252         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2253 }
2254 
2255 /* struct btrfs_root_backup */
2256 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2257                    tree_root, 64);
2258 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2259                    tree_root_gen, 64);
2260 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2261                    tree_root_level, 8);
2262 
2263 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2264                    chunk_root, 64);
2265 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2266                    chunk_root_gen, 64);
2267 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2268                    chunk_root_level, 8);
2269 
2270 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2271                    extent_root, 64);
2272 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2273                    extent_root_gen, 64);
2274 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2275                    extent_root_level, 8);
2276 
2277 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2278                    fs_root, 64);
2279 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2280                    fs_root_gen, 64);
2281 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2282                    fs_root_level, 8);
2283 
2284 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2285                    dev_root, 64);
2286 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2287                    dev_root_gen, 64);
2288 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2289                    dev_root_level, 8);
2290 
2291 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2292                    csum_root, 64);
2293 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2294                    csum_root_gen, 64);
2295 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2296                    csum_root_level, 8);
2297 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2298                    total_bytes, 64);
2299 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2300                    bytes_used, 64);
2301 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2302                    num_devices, 64);
2303 
2304 /* struct btrfs_balance_item */
2305 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2306 
2307 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2308                                       const struct btrfs_balance_item *bi,
2309                                       struct btrfs_disk_balance_args *ba)
2310 {
2311         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2312 }
2313 
2314 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2315                                   struct btrfs_balance_item *bi,
2316                                   const struct btrfs_disk_balance_args *ba)
2317 {
2318         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2319 }
2320 
2321 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2322                                       const struct btrfs_balance_item *bi,
2323                                       struct btrfs_disk_balance_args *ba)
2324 {
2325         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2326 }
2327 
2328 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2329                                   struct btrfs_balance_item *bi,
2330                                   const struct btrfs_disk_balance_args *ba)
2331 {
2332         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2333 }
2334 
2335 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2336                                      const struct btrfs_balance_item *bi,
2337                                      struct btrfs_disk_balance_args *ba)
2338 {
2339         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2340 }
2341 
2342 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2343                                  struct btrfs_balance_item *bi,
2344                                  const struct btrfs_disk_balance_args *ba)
2345 {
2346         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2347 }
2348 
2349 static inline void
2350 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2351                                const struct btrfs_disk_balance_args *disk)
2352 {
2353         memset(cpu, 0, sizeof(*cpu));
2354 
2355         cpu->profiles = le64_to_cpu(disk->profiles);
2356         cpu->usage = le64_to_cpu(disk->usage);
2357         cpu->devid = le64_to_cpu(disk->devid);
2358         cpu->pstart = le64_to_cpu(disk->pstart);
2359         cpu->pend = le64_to_cpu(disk->pend);
2360         cpu->vstart = le64_to_cpu(disk->vstart);
2361         cpu->vend = le64_to_cpu(disk->vend);
2362         cpu->target = le64_to_cpu(disk->target);
2363         cpu->flags = le64_to_cpu(disk->flags);
2364         cpu->limit = le64_to_cpu(disk->limit);
2365         cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2366         cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2367 }
2368 
2369 static inline void
2370 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2371                                const struct btrfs_balance_args *cpu)
2372 {
2373         memset(disk, 0, sizeof(*disk));
2374 
2375         disk->profiles = cpu_to_le64(cpu->profiles);
2376         disk->usage = cpu_to_le64(cpu->usage);
2377         disk->devid = cpu_to_le64(cpu->devid);
2378         disk->pstart = cpu_to_le64(cpu->pstart);
2379         disk->pend = cpu_to_le64(cpu->pend);
2380         disk->vstart = cpu_to_le64(cpu->vstart);
2381         disk->vend = cpu_to_le64(cpu->vend);
2382         disk->target = cpu_to_le64(cpu->target);
2383         disk->flags = cpu_to_le64(cpu->flags);
2384         disk->limit = cpu_to_le64(cpu->limit);
2385         disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2386         disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2387 }
2388 
2389 /* struct btrfs_super_block */
2390 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2391 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2392 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2393                          generation, 64);
2394 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2395 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2396                          struct btrfs_super_block, sys_chunk_array_size, 32);
2397 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2398                          struct btrfs_super_block, chunk_root_generation, 64);
2399 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2400                          root_level, 8);
2401 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2402                          chunk_root, 64);
2403 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2404                          chunk_root_level, 8);
2405 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2406                          log_root, 64);
2407 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2408                          log_root_transid, 64);
2409 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2410                          log_root_level, 8);
2411 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2412                          total_bytes, 64);
2413 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2414                          bytes_used, 64);
2415 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2416                          sectorsize, 32);
2417 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2418                          nodesize, 32);
2419 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2420                          stripesize, 32);
2421 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2422                          root_dir_objectid, 64);
2423 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2424                          num_devices, 64);
2425 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2426                          compat_flags, 64);
2427 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2428                          compat_ro_flags, 64);
2429 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2430                          incompat_flags, 64);
2431 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2432                          csum_type, 16);
2433 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2434                          cache_generation, 64);
2435 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2436 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2437                          uuid_tree_generation, 64);
2438 
2439 static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
2440 {
2441         u16 t = btrfs_super_csum_type(s);
2442         /*
2443          * csum type is validated at mount time
2444          */
2445         return btrfs_csum_sizes[t];
2446 }
2447 
2448 
2449 /*
2450  * The leaf data grows from end-to-front in the node.
2451  * this returns the address of the start of the last item,
2452  * which is the stop of the leaf data stack
2453  */
2454 static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
2455                                          const struct extent_buffer *leaf)
2456 {
2457         u32 nr = btrfs_header_nritems(leaf);
2458 
2459         if (nr == 0)
2460                 return BTRFS_LEAF_DATA_SIZE(fs_info);
2461         return btrfs_item_offset_nr(leaf, nr - 1);
2462 }
2463 
2464 /* struct btrfs_file_extent_item */
2465 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2466 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2467                          struct btrfs_file_extent_item, disk_bytenr, 64);
2468 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2469                          struct btrfs_file_extent_item, offset, 64);
2470 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2471                          struct btrfs_file_extent_item, generation, 64);
2472 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2473                          struct btrfs_file_extent_item, num_bytes, 64);
2474 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2475                          struct btrfs_file_extent_item, disk_num_bytes, 64);
2476 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2477                          struct btrfs_file_extent_item, compression, 8);
2478 
2479 static inline unsigned long
2480 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2481 {
2482         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2483 }
2484 
2485 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2486 {
2487         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2488 }
2489 
2490 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2491                    disk_bytenr, 64);
2492 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2493                    generation, 64);
2494 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2495                    disk_num_bytes, 64);
2496 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2497                   offset, 64);
2498 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2499                    num_bytes, 64);
2500 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2501                    ram_bytes, 64);
2502 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2503                    compression, 8);
2504 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2505                    encryption, 8);
2506 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2507                    other_encoding, 16);
2508 
2509 /*
2510  * this returns the number of bytes used by the item on disk, minus the
2511  * size of any extent headers.  If a file is compressed on disk, this is
2512  * the compressed size
2513  */
2514 static inline u32 btrfs_file_extent_inline_item_len(
2515                                                 const struct extent_buffer *eb,
2516                                                 struct btrfs_item *e)
2517 {
2518         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2519 }
2520 
2521 /* btrfs_dev_stats_item */
2522 static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
2523                                         const struct btrfs_dev_stats_item *ptr,
2524                                         int index)
2525 {
2526         u64 val;
2527 
2528         read_extent_buffer(eb, &val,
2529                            offsetof(struct btrfs_dev_stats_item, values) +
2530                             ((unsigned long)ptr) + (index * sizeof(u64)),
2531                            sizeof(val));
2532         return val;
2533 }
2534 
2535 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2536                                              struct btrfs_dev_stats_item *ptr,
2537                                              int index, u64 val)
2538 {
2539         write_extent_buffer(eb, &val,
2540                             offsetof(struct btrfs_dev_stats_item, values) +
2541                              ((unsigned long)ptr) + (index * sizeof(u64)),
2542                             sizeof(val));
2543 }
2544 
2545 /* btrfs_qgroup_status_item */
2546 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2547                    generation, 64);
2548 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2549                    version, 64);
2550 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2551                    flags, 64);
2552 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2553                    rescan, 64);
2554 
2555 /* btrfs_qgroup_info_item */
2556 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2557                    generation, 64);
2558 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2559 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2560                    rfer_cmpr, 64);
2561 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2562 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2563                    excl_cmpr, 64);
2564 
2565 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2566                          struct btrfs_qgroup_info_item, generation, 64);
2567 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2568                          rfer, 64);
2569 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2570                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2571 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2572                          excl, 64);
2573 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2574                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
2575 
2576 /* btrfs_qgroup_limit_item */
2577 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2578                    flags, 64);
2579 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2580                    max_rfer, 64);
2581 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2582                    max_excl, 64);
2583 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2584                    rsv_rfer, 64);
2585 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2586                    rsv_excl, 64);
2587 
2588 /* btrfs_dev_replace_item */
2589 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2590                    struct btrfs_dev_replace_item, src_devid, 64);
2591 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2592                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2593                    64);
2594 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2595                    replace_state, 64);
2596 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2597                    time_started, 64);
2598 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2599                    time_stopped, 64);
2600 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2601                    num_write_errors, 64);
2602 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2603                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2604                    64);
2605 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2606                    cursor_left, 64);
2607 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2608                    cursor_right, 64);
2609 
2610 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2611                          struct btrfs_dev_replace_item, src_devid, 64);
2612 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2613                          struct btrfs_dev_replace_item,
2614                          cont_reading_from_srcdev_mode, 64);
2615 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2616                          struct btrfs_dev_replace_item, replace_state, 64);
2617 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2618                          struct btrfs_dev_replace_item, time_started, 64);
2619 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2620                          struct btrfs_dev_replace_item, time_stopped, 64);
2621 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2622                          struct btrfs_dev_replace_item, num_write_errors, 64);
2623 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2624                          struct btrfs_dev_replace_item,
2625                          num_uncorrectable_read_errors, 64);
2626 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2627                          struct btrfs_dev_replace_item, cursor_left, 64);
2628 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2629                          struct btrfs_dev_replace_item, cursor_right, 64);
2630 
2631 /* helper function to cast into the data area of the leaf. */
2632 #define btrfs_item_ptr(leaf, slot, type) \
2633         ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2634         btrfs_item_offset_nr(leaf, slot)))
2635 
2636 #define btrfs_item_ptr_offset(leaf, slot) \
2637         ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2638         btrfs_item_offset_nr(leaf, slot)))
2639 
2640 static inline u64 btrfs_name_hash(const char *name, int len)
2641 {
2642        return crc32c((u32)~1, name, len);
2643 }
2644 
2645 /*
2646  * Figure the key offset of an extended inode ref
2647  */
2648 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2649                                    int len)
2650 {
2651        return (u64) crc32c(parent_objectid, name, len);
2652 }
2653 
2654 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2655 {
2656         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2657                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2658 }
2659 
2660 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2661 {
2662         return mapping_gfp_constraint(mapping, ~__GFP_FS);
2663 }
2664 
2665 /* extent-tree.c */
2666 
2667 enum btrfs_inline_ref_type {
2668         BTRFS_REF_TYPE_INVALID,
2669         BTRFS_REF_TYPE_BLOCK,
2670         BTRFS_REF_TYPE_DATA,
2671         BTRFS_REF_TYPE_ANY,
2672 };
2673 
2674 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2675                                      struct btrfs_extent_inline_ref *iref,
2676                                      enum btrfs_inline_ref_type is_data);
2677 
2678 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2679 
2680 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2681                                                  unsigned num_items)
2682 {
2683         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2684 }
2685 
2686 /*
2687  * Doing a truncate won't result in new nodes or leaves, just what we need for
2688  * COW.
2689  */
2690 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2691                                                  unsigned num_items)
2692 {
2693         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2694 }
2695 
2696 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans);
2697 bool btrfs_check_space_for_delayed_refs(struct btrfs_fs_info *fs_info);
2698 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2699                                          const u64 start);
2700 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2701 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2702 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2703 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2704 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2705 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2706                            unsigned long count);
2707 int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2708                                  unsigned long count, u64 transid, int wait);
2709 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2710                                   struct btrfs_delayed_ref_root *delayed_refs,
2711                                   struct btrfs_delayed_ref_head *head);
2712 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2713 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2714                              struct btrfs_fs_info *fs_info, u64 bytenr,
2715                              u64 offset, int metadata, u64 *refs, u64 *flags);
2716 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2717                      u64 bytenr, u64 num, int reserved);
2718 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2719                                     u64 bytenr, u64 num_bytes);
2720 int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2721                                  struct extent_buffer *eb);
2722 int btrfs_cross_ref_exist(struct btrfs_root *root,
2723                           u64 objectid, u64 offset, u64 bytenr);
2724 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2725                                                  struct btrfs_fs_info *info,
2726                                                  u64 bytenr);
2727 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2728 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2729 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2730                                              struct btrfs_root *root,
2731                                              u64 parent, u64 root_objectid,
2732                                              const struct btrfs_disk_key *key,
2733                                              int level, u64 hint,
2734                                              u64 empty_size);
2735 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2736                            struct btrfs_root *root,
2737                            struct extent_buffer *buf,
2738                            u64 parent, int last_ref);
2739 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2740                                      struct btrfs_root *root, u64 owner,
2741                                      u64 offset, u64 ram_bytes,
2742                                      struct btrfs_key *ins);
2743 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2744                                    u64 root_objectid, u64 owner, u64 offset,
2745                                    struct btrfs_key *ins);
2746 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2747                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2748                          struct btrfs_key *ins, int is_data, int delalloc);
2749 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2750                   struct extent_buffer *buf, int full_backref);
2751 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2752                   struct extent_buffer *buf, int full_backref);
2753 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2754                                 struct btrfs_fs_info *fs_info,
2755                                 u64 bytenr, u64 num_bytes, u64 flags,
2756                                 int level, int is_data);
2757 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2758                       struct btrfs_root *root,
2759                       u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2760                       u64 owner, u64 offset);
2761 
2762 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2763                                u64 start, u64 len, int delalloc);
2764 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2765                                        u64 start, u64 len);
2766 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2767 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2768 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2769                          struct btrfs_root *root,
2770                          u64 bytenr, u64 num_bytes, u64 parent,
2771                          u64 root_objectid, u64 owner, u64 offset);
2772 
2773 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
2774 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2775                                    struct btrfs_fs_info *fs_info);
2776 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2777                             struct btrfs_fs_info *fs_info);
2778 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2779 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2780 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2781 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2782 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2783                            u64 bytes_used, u64 type, u64 chunk_offset,
2784                            u64 size);
2785 void btrfs_add_raid_kobjects(struct btrfs_fs_info *fs_info);
2786 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2787                                 struct btrfs_fs_info *fs_info,
2788                                 const u64 chunk_offset);
2789 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2790                              u64 group_start, struct extent_map *em);
2791 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2792 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2793 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2794 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
2795 u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info);
2796 u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info);
2797 u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info);
2798 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2799 
2800 enum btrfs_reserve_flush_enum {
2801         /* If we are in the transaction, we can't flush anything.*/
2802         BTRFS_RESERVE_NO_FLUSH,
2803         /*
2804          * Flushing delalloc may cause deadlock somewhere, in this
2805          * case, use FLUSH LIMIT
2806          */
2807         BTRFS_RESERVE_FLUSH_LIMIT,
2808         BTRFS_RESERVE_FLUSH_ALL,
2809 };
2810 
2811 enum btrfs_flush_state {
2812         FLUSH_DELAYED_ITEMS_NR  =       1,
2813         FLUSH_DELAYED_ITEMS     =       2,
2814         FLUSH_DELAYED_REFS_NR   =       3,
2815         FLUSH_DELAYED_REFS      =       4,
2816         FLUSH_DELALLOC          =       5,
2817         FLUSH_DELALLOC_WAIT     =       6,
2818         ALLOC_CHUNK             =       7,
2819         ALLOC_CHUNK_FORCE       =       8,
2820         COMMIT_TRANS            =       9,
2821 };
2822 
2823 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
2824 int btrfs_check_data_free_space(struct inode *inode,
2825                         struct extent_changeset **reserved, u64 start, u64 len);
2826 void btrfs_free_reserved_data_space(struct inode *inode,
2827                         struct extent_changeset *reserved, u64 start, u64 len);
2828 void btrfs_delalloc_release_space(struct inode *inode,
2829                                   struct extent_changeset *reserved,
2830                                   u64 start, u64 len, bool qgroup_free);
2831 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2832                                             u64 len);
2833 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2834 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2835                                      struct btrfs_block_rsv *rsv,
2836                                      int nitems, bool use_global_rsv);
2837 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2838                                       struct btrfs_block_rsv *rsv);
2839 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes,
2840                                     bool qgroup_free);
2841 
2842 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2843 void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes,
2844                                      bool qgroup_free);
2845 int btrfs_delalloc_reserve_space(struct inode *inode,
2846                         struct extent_changeset **reserved, u64 start, u64 len);
2847 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2848 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2849                                               unsigned short type);
2850 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
2851                                    struct btrfs_block_rsv *rsv,
2852                                    unsigned short type);
2853 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2854                           struct btrfs_block_rsv *rsv);
2855 int btrfs_block_rsv_add(struct btrfs_root *root,
2856                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2857                         enum btrfs_reserve_flush_enum flush);
2858 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2859 int btrfs_block_rsv_refill(struct btrfs_root *root,
2860                            struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2861                            enum btrfs_reserve_flush_enum flush);
2862 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2863                             struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2864                             bool update_size);
2865 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2866                              struct btrfs_block_rsv *dest, u64 num_bytes,
2867                              int min_factor);
2868 void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2869                              struct btrfs_block_rsv *block_rsv,
2870                              u64 num_bytes);
2871 void btrfs_delayed_refs_rsv_release(struct btrfs_fs_info *fs_info, int nr);
2872 void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle *trans);
2873 int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
2874                                   enum btrfs_reserve_flush_enum flush);
2875 void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info *fs_info,
2876                                        struct btrfs_block_rsv *src,
2877                                        u64 num_bytes);
2878 int btrfs_inc_block_group_ro(struct btrfs_block_group_cache *cache);
2879 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2880 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2881 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2882 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2883                                    u64 start, u64 end);
2884 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2885                          u64 num_bytes, u64 *actual_bytes);
2886 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type);
2887 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2888 
2889 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2890 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2891                                          struct btrfs_fs_info *fs_info);
2892 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2893 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2894 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2895 void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type);
2896 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2897                        u64 start, u64 end);
2898 void btrfs_mark_bg_unused(struct btrfs_block_group_cache *bg);
2899 
2900 /* ctree.c */
2901 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2902                      int level, int *slot);
2903 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2904 int btrfs_previous_item(struct btrfs_root *root,
2905                         struct btrfs_path *path, u64 min_objectid,
2906                         int type);
2907 int btrfs_previous_extent_item(struct btrfs_root *root,
2908                         struct btrfs_path *path, u64 min_objectid);
2909 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2910                              struct btrfs_path *path,
2911                              const struct btrfs_key *new_key);
2912 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2913 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2914 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2915 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2916                         struct btrfs_key *key, int lowest_level,
2917                         u64 min_trans);
2918 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2919                          struct btrfs_path *path,
2920                          u64 min_trans);
2921 enum btrfs_compare_tree_result {
2922         BTRFS_COMPARE_TREE_NEW,
2923         BTRFS_COMPARE_TREE_DELETED,
2924         BTRFS_COMPARE_TREE_CHANGED,
2925         BTRFS_COMPARE_TREE_SAME,
2926 };
2927 typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
2928                                   struct btrfs_path *right_path,
2929                                   struct btrfs_key *key,
2930                                   enum btrfs_compare_tree_result result,
2931                                   void *ctx);
2932 int btrfs_compare_trees(struct btrfs_root *left_root,
2933                         struct btrfs_root *right_root,
2934                         btrfs_changed_cb_t cb, void *ctx);
2935 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2936                     struct btrfs_root *root, struct extent_buffer *buf,
2937                     struct extent_buffer *parent, int parent_slot,
2938                     struct extent_buffer **cow_ret);
2939 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2940                       struct btrfs_root *root,
2941                       struct extent_buffer *buf,
2942                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2943 int btrfs_block_can_be_shared(struct btrfs_root *root,
2944                               struct extent_buffer *buf);
2945 void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2946                        u32 data_size);
2947 void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2948                          struct btrfs_path *path, u32 new_size, int from_end);
2949 int btrfs_split_item(struct btrfs_trans_handle *trans,
2950                      struct btrfs_root *root,
2951                      struct btrfs_path *path,
2952                      const struct btrfs_key *new_key,
2953                      unsigned long split_offset);
2954 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2955                          struct btrfs_root *root,
2956                          struct btrfs_path *path,
2957                          const struct btrfs_key *new_key);
2958 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2959                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2960 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2961                       const struct btrfs_key *key, struct btrfs_path *p,
2962                       int ins_len, int cow);
2963 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2964                           struct btrfs_path *p, u64 time_seq);
2965 int btrfs_search_slot_for_read(struct btrfs_root *root,
2966                                const struct btrfs_key *key,
2967                                struct btrfs_path *p, int find_higher,
2968                                int return_any);
2969 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2970                        struct btrfs_root *root, struct extent_buffer *parent,
2971                        int start_slot, u64 *last_ret,
2972                        struct btrfs_key *progress);
2973 void btrfs_release_path(struct btrfs_path *p);
2974 struct btrfs_path *btrfs_alloc_path(void);
2975 void btrfs_free_path(struct btrfs_path *p);
2976 void btrfs_set_path_blocking(struct btrfs_path *p);
2977 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2978 
2979 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2980                    struct btrfs_path *path, int slot, int nr);
2981 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2982                                  struct btrfs_root *root,
2983                                  struct btrfs_path *path)
2984 {
2985         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2986 }
2987 
2988 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2989                             const struct btrfs_key *cpu_key, u32 *data_size,
2990                             u32 total_data, u32 total_size, int nr);
2991 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2992                       const struct btrfs_key *key, void *data, u32 data_size);
2993 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2994                              struct btrfs_root *root,
2995                              struct btrfs_path *path,
2996                              const struct btrfs_key *cpu_key, u32 *data_size,
2997                              int nr);
2998 
2999 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
3000                                           struct btrfs_root *root,
3001                                           struct btrfs_path *path,
3002                                           const struct btrfs_key *key,
3003                                           u32 data_size)
3004 {
3005         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
3006 }
3007 
3008 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
3009 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
3010 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
3011                         u64 time_seq);
3012 static inline int btrfs_next_old_item(struct btrfs_root *root,
3013                                       struct btrfs_path *p, u64 time_seq)
3014 {
3015         ++p->slots[0];
3016         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
3017                 return btrfs_next_old_leaf(root, p, time_seq);
3018         return 0;
3019 }
3020 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
3021 {
3022         return btrfs_next_old_item(root, p, 0);
3023 }
3024 int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
3025                           struct extent_buffer *leaf);
3026 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
3027                                      struct btrfs_block_rsv *block_rsv,
3028                                      int update_ref, int for_reloc);
3029 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
3030                         struct btrfs_root *root,
3031                         struct extent_buffer *node,
3032                         struct extent_buffer *parent);
3033 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
3034 {
3035         /*
3036          * Do it this way so we only ever do one test_bit in the normal case.
3037          */
3038         if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
3039                 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
3040                         return 2;
3041                 return 1;
3042         }
3043         return 0;
3044 }
3045 
3046 /*
3047  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3048  * anything except sleeping. This function is used to check the status of
3049  * the fs.
3050  */
3051 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
3052 {
3053         return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
3054 }
3055 
3056 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
3057 {
3058         kfree(fs_info->balance_ctl);
3059         kfree(fs_info->delayed_root);
3060         kfree(fs_info->extent_root);
3061         kfree(fs_info->tree_root);
3062         kfree(fs_info->chunk_root);
3063         kfree(fs_info->dev_root);
3064         kfree(fs_info->csum_root);
3065         kfree(fs_info->quota_root);
3066         kfree(fs_info->uuid_root);
3067         kfree(fs_info->free_space_root);
3068         kfree(fs_info->super_copy);
3069         kfree(fs_info->super_for_commit);
3070         kvfree(fs_info);
3071 }
3072 
3073 /* tree mod log functions from ctree.c */
3074 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
3075                            struct seq_list *elem);
3076 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
3077                             struct seq_list *elem);
3078 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
3079 
3080 /* root-item.c */
3081 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3082                        u64 ref_id, u64 dirid, u64 sequence, const char *name,
3083                        int name_len);
3084 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3085                        u64 ref_id, u64 dirid, u64 *sequence, const char *name,
3086                        int name_len);
3087 int btrfs_del_root(struct btrfs_trans_handle *trans,
3088                    const struct btrfs_key *key);
3089 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3090                       const struct btrfs_key *key,
3091                       struct btrfs_root_item *item);
3092 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3093                                    struct btrfs_root *root,
3094                                    struct btrfs_key *key,
3095                                    struct btrfs_root_item *item);
3096 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3097                     struct btrfs_path *path, struct btrfs_root_item *root_item,
3098                     struct btrfs_key *root_key);
3099 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3100 void btrfs_set_root_node(struct btrfs_root_item *item,
3101                          struct extent_buffer *node);
3102 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3103 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3104                              struct btrfs_root *root);
3105 
3106 /* uuid-tree.c */
3107 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3108                         u64 subid);
3109 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3110                         u64 subid);
3111 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3112                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3113                                               u64));
3114 
3115 /* dir-item.c */
3116 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3117                           const char *name, int name_len);
3118 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3119                           int name_len, struct btrfs_inode *dir,
3120                           struct btrfs_key *location, u8 type, u64 index);
3121 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3122                                              struct btrfs_root *root,
3123                                              struct btrfs_path *path, u64 dir,
3124                                              const char *name, int name_len,
3125                                              int mod);
3126 struct btrfs_dir_item *
3127 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3128                             struct btrfs_root *root,
3129                             struct btrfs_path *path, u64 dir,
3130                             u64 objectid, const char *name, int name_len,
3131                             int mod);
3132 struct btrfs_dir_item *
3133 btrfs_search_dir_index_item(struct btrfs_root *root,
3134                             struct btrfs_path *path, u64 dirid,
3135                             const char *name, int name_len);
3136 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3137                               struct btrfs_root *root,
3138                               struct btrfs_path *path,
3139                               struct btrfs_dir_item *di);
3140 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3141                             struct btrfs_root *root,
3142                             struct btrfs_path *path, u64 objectid,
3143                             const char *name, u16 name_len,
3144                             const void *data, u16 data_len);
3145 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3146                                           struct btrfs_root *root,
3147                                           struct btrfs_path *path, u64 dir,
3148                                           const char *name, u16 name_len,
3149                                           int mod);
3150 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3151                                                  struct btrfs_path *path,
3152                                                  const char *name,
3153                                                  int name_len);
3154 
3155 /* orphan.c */
3156 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3157                              struct btrfs_root *root, u64 offset);
3158 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3159                           struct btrfs_root *root, u64 offset);
3160 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3161 
3162 /* inode-item.c */
3163 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3164                            struct btrfs_root *root,
3165                            const char *name, int name_len,
3166                            u64 inode_objectid, u64 ref_objectid, u64 index);
3167 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3168                            struct btrfs_root *root,
3169                            const char *name, int name_len,
3170                            u64 inode_objectid, u64 ref_objectid, u64 *index);
3171 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3172                              struct btrfs_root *root,
3173                              struct btrfs_path *path, u64 objectid);
3174 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3175                        *root, struct btrfs_path *path,
3176                        struct btrfs_key *location, int mod);
3177 
3178 struct btrfs_inode_extref *
3179 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3180                           struct btrfs_root *root,
3181                           struct btrfs_path *path,
3182                           const char *name, int name_len,
3183                           u64 inode_objectid, u64 ref_objectid, int ins_len,
3184                           int cow);
3185 
3186 int btrfs_find_name_in_backref(struct extent_buffer *leaf, int slot,
3187                                const char *name,
3188                                int name_len, struct btrfs_inode_ref **ref_ret);
3189 int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
3190                                    u64 ref_objectid, const char *name,
3191                                    int name_len,
3192                                    struct btrfs_inode_extref **extref_ret);
3193 
3194 /* file-item.c */
3195 struct btrfs_dio_private;
3196 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3197                     struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
3198 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3199 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3200                               u64 logical_offset);
3201 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3202                              struct btrfs_root *root,
3203                              u64 objectid, u64 pos,
3204                              u64 disk_offset, u64 disk_num_bytes,
3205                              u64 num_bytes, u64 offset, u64 ram_bytes,
3206                              u8 compression, u8 encryption, u16 other_encoding);
3207 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3208                              struct btrfs_root *root,
3209                              struct btrfs_path *path, u64 objectid,
3210                              u64 bytenr, int mod);
3211 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3212                            struct btrfs_root *root,
3213                            struct btrfs_ordered_sum *sums);
3214 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3215                        u64 file_start, int contig);
3216 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3217                              struct list_head *list, int search_commit);
3218 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3219                                      const struct btrfs_path *path,
3220                                      struct btrfs_file_extent_item *fi,
3221                                      const bool new_inline,
3222                                      struct extent_map *em);
3223 
3224 /* inode.c */
3225 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3226                                            u64 start, u64 len);
3227 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3228                               u64 *orig_start, u64 *orig_block_len,
3229                               u64 *ram_bytes);
3230 
3231 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3232                                 struct btrfs_inode *inode);
3233 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3234 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3235 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3236                        struct btrfs_root *root,
3237                        struct btrfs_inode *dir, struct btrfs_inode *inode,
3238                        const char *name, int name_len);
3239 int btrfs_add_link(struct btrfs_trans_handle *trans,
3240                    struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3241                    const char *name, int name_len, int add_backref, u64 index);
3242 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3243 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3244                         int front);
3245 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3246                                struct btrfs_root *root,
3247                                struct inode *inode, u64 new_size,
3248                                u32 min_type);
3249 
3250 int btrfs_start_delalloc_snapshot(struct btrfs_root *root);
3251 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
3252 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3253                               unsigned int extra_bits,
3254                               struct extent_state **cached_state, int dedupe);
3255 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3256                              struct btrfs_root *new_root,
3257                              struct btrfs_root *parent_root,
3258                              u64 new_dirid);
3259  void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3260                                unsigned *bits);
3261 void btrfs_clear_delalloc_extent(struct inode *inode,
3262                                  struct extent_state *state, unsigned *bits);
3263 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3264                                  struct extent_state *other);
3265 void btrfs_split_delalloc_extent(struct inode *inode,
3266                                  struct extent_state *orig, u64 split);
3267 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
3268                              unsigned long bio_flags);
3269 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end);
3270 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3271 int btrfs_readpage(struct file *file, struct page *page);
3272 void btrfs_evict_inode(struct inode *inode);
3273 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3274 struct inode *btrfs_alloc_inode(struct super_block *sb);
3275 void btrfs_destroy_inode(struct inode *inode);
3276 int btrfs_drop_inode(struct inode *inode);
3277 int __init btrfs_init_cachep(void);
3278 void __cold btrfs_destroy_cachep(void);
3279 struct inode *btrfs_iget_path(struct super_block *s, struct btrfs_key *location,
3280                               struct btrfs_root *root, int *new,
3281                               struct btrfs_path *path);
3282 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3283                          struct btrfs_root *root, int *was_new);
3284 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3285                                     struct page *page, size_t pg_offset,
3286                                     u64 start, u64 end, int create);
3287 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3288                               struct btrfs_root *root,
3289                               struct inode *inode);
3290 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3291                                 struct btrfs_root *root, struct inode *inode);
3292 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3293                 struct btrfs_inode *inode);
3294 int btrfs_orphan_cleanup(struct btrfs_root *root);
3295 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3296 void btrfs_add_delayed_iput(struct inode *inode);
3297 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3298 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3299 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3300                               u64 start, u64 num_bytes, u64 min_size,
3301                               loff_t actual_len, u64 *alloc_hint);
3302 int btrfs_prealloc_file_range_trans(struct inode *inode,
3303                                     struct btrfs_trans_handle *trans, int mode,
3304                                     u64 start, u64 num_bytes, u64 min_size,
3305                                     loff_t actual_len, u64 *alloc_hint);
3306 int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page,
3307                 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3308                 struct writeback_control *wbc);
3309 int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end);
3310 void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
3311                                           u64 end, int uptodate);
3312 extern const struct dentry_operations btrfs_dentry_operations;
3313 
3314 /* ioctl.c */
3315 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3316 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3317 int btrfs_ioctl_get_supported_features(void __user *arg);
3318 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3319 int btrfs_is_empty_uuid(u8 *uuid);
3320 int btrfs_defrag_file(struct inode *inode, struct file *file,
3321                       struct btrfs_ioctl_defrag_range_args *range,
3322                       u64 newer_than, unsigned long max_pages);
3323 void btrfs_get_block_group_info(struct list_head *groups_list,
3324                                 struct btrfs_ioctl_space_info *space);
3325 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3326                                struct btrfs_ioctl_balance_args *bargs);
3327 
3328 /* file.c */
3329 int __init btrfs_auto_defrag_init(void);
3330 void __cold btrfs_auto_defrag_exit(void);
3331 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3332                            struct btrfs_inode *inode);
3333 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3334 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3335 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3336 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3337                              int skip_pinned);
3338 extern const struct file_operations btrfs_file_operations;
3339 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3340                          struct btrfs_root *root, struct inode *inode,
3341                          struct btrfs_path *path, u64 start, u64 end,
3342                          u64 *drop_end, int drop_cache,
3343                          int replace_extent,
3344                          u32 extent_item_size,
3345                          int *key_inserted);
3346 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3347                        struct btrfs_root *root, struct inode *inode, u64 start,
3348                        u64 end, int drop_cache);
3349 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3350                               struct btrfs_inode *inode, u64 start, u64 end);
3351 int btrfs_release_file(struct inode *inode, struct file *file);
3352 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3353                       size_t num_pages, loff_t pos, size_t write_bytes,
3354                       struct extent_state **cached);
3355 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3356 loff_t btrfs_remap_file_range(struct file *file_in, loff_t pos_in,
3357                               struct file *file_out, loff_t pos_out,
3358                               loff_t len, unsigned int remap_flags);
3359 
3360 /* tree-defrag.c */
3361 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3362                         struct btrfs_root *root);
3363 
3364 /* sysfs.c */
3365 int __init btrfs_init_sysfs(void);
3366 void __cold btrfs_exit_sysfs(void);
3367 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3368 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3369 
3370 /* super.c */
3371 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3372                         unsigned long new_flags);
3373 int btrfs_sync_fs(struct super_block *sb, int wait);
3374 
3375 static inline __printf(2, 3) __cold
3376 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3377 {
3378 }
3379 
3380 #ifdef CONFIG_PRINTK
3381 __printf(2, 3)
3382 __cold
3383 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3384 #else
3385 #define btrfs_printk(fs_info, fmt, args...) \
3386         btrfs_no_printk(fs_info, fmt, ##args)
3387 #endif
3388 
3389 #define btrfs_emerg(fs_info, fmt, args...) \
3390         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3391 #define btrfs_alert(fs_info, fmt, args...) \
3392         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3393 #define btrfs_crit(fs_info, fmt, args...) \
3394         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3395 #define btrfs_err(fs_info, fmt, args...) \
3396         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3397 #define btrfs_warn(fs_info, fmt, args...) \
3398         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3399 #define btrfs_notice(fs_info, fmt, args...) \
3400         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3401 #define btrfs_info(fs_info, fmt, args...) \
3402         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3403 
3404 /*
3405  * Wrappers that use printk_in_rcu
3406  */
3407 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3408         btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3409 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3410         btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3411 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3412         btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3413 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3414         btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3415 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3416         btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3417 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3418         btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3419 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3420         btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3421 
3422 /*
3423  * Wrappers that use a ratelimited printk_in_rcu
3424  */
3425 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3426         btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3427 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3428         btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3429 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3430         btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3431 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3432         btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3433 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3434         btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3435 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3436         btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3437 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3438         btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3439 
3440 /*
3441  * Wrappers that use a ratelimited printk
3442  */
3443 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3444         btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3445 #define btrfs_alert_rl(fs_info, fmt, args...) \
3446         btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3447 #define btrfs_crit_rl(fs_info, fmt, args...) \
3448         btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3449 #define btrfs_err_rl(fs_info, fmt, args...) \
3450         btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3451 #define btrfs_warn_rl(fs_info, fmt, args...) \
3452         btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3453 #define btrfs_notice_rl(fs_info, fmt, args...) \
3454         btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3455 #define btrfs_info_rl(fs_info, fmt, args...) \
3456         btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3457 
3458 #if defined(CONFIG_DYNAMIC_DEBUG)
3459 #define btrfs_debug(fs_info, fmt, args...)                              \
3460         _dynamic_func_call_no_desc(fmt, btrfs_printk,                   \
3461                                    fs_info, KERN_DEBUG fmt, ##args)
3462 #define btrfs_debug_in_rcu(fs_info, fmt, args...)                       \
3463         _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu,            \
3464                                    fs_info, KERN_DEBUG fmt, ##args)
3465 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)                    \
3466         _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu,         \
3467                                    fs_info, KERN_DEBUG fmt, ##args)
3468 #define btrfs_debug_rl(fs_info, fmt, args...)                           \
3469         _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited,       \
3470                                    fs_info, KERN_DEBUG fmt, ##args)
3471 #elif defined(DEBUG)
3472 #define btrfs_debug(fs_info, fmt, args...) \
3473         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3474 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3475         btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3476 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3477         btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3478 #define btrfs_debug_rl(fs_info, fmt, args...) \
3479         btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3480 #else
3481 #define btrfs_debug(fs_info, fmt, args...) \
3482         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3483 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3484         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3485 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3486         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3487 #define btrfs_debug_rl(fs_info, fmt, args...) \
3488         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3489 #endif
3490 
3491 #define btrfs_printk_in_rcu(fs_info, fmt, args...)      \
3492 do {                                                    \
3493         rcu_read_lock();                                \
3494         btrfs_printk(fs_info, fmt, ##args);             \
3495         rcu_read_unlock();                              \
3496 } while (0)
3497 
3498 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...)   \
3499 do {                                                    \
3500         rcu_read_lock();                                \
3501         btrfs_no_printk(fs_info, fmt, ##args);          \
3502         rcu_read_unlock();                              \
3503 } while (0)
3504 
3505 #define btrfs_printk_ratelimited(fs_info, fmt, args...)         \
3506 do {                                                            \
3507         static DEFINE_RATELIMIT_STATE(_rs,                      \
3508                 DEFAULT_RATELIMIT_INTERVAL,                     \
3509                 DEFAULT_RATELIMIT_BURST);                       \
3510         if (__ratelimit(&_rs))                                  \
3511                 btrfs_printk(fs_info, fmt, ##args);             \
3512 } while (0)
3513 
3514 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)           \
3515 do {                                                            \
3516         rcu_read_lock();                                        \
3517         btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
3518         rcu_read_unlock();                                      \
3519 } while (0)
3520 
3521 __cold
3522 static inline void assfail(const char *expr, const char *file, int line)
3523 {
3524         if (IS_ENABLED(CONFIG_BTRFS_ASSERT)) {
3525                 pr_err("assertion failed: %s, file: %s, line: %d\n",
3526                        expr, file, line);
3527                 BUG();
3528         }
3529 }
3530 
3531 #define ASSERT(expr)    \
3532         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3533 
3534 /*
3535  * Use that for functions that are conditionally exported for sanity tests but
3536  * otherwise static
3537  */
3538 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3539 #define EXPORT_FOR_TESTS static
3540 #else
3541 #define EXPORT_FOR_TESTS
3542 #endif
3543 
3544 __cold
3545 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3546 {
3547         btrfs_err(fs_info,
3548 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3549 }
3550 
3551 __printf(5, 6)
3552 __cold
3553 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3554                      unsigned int line, int errno, const char *fmt, ...);
3555 
3556 const char *btrfs_decode_error(int errno);
3557 
3558 __cold
3559 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3560                                const char *function,
3561                                unsigned int line, int errno);
3562 
3563 /*
3564  * Call btrfs_abort_transaction as early as possible when an error condition is
3565  * detected, that way the exact line number is reported.
3566  */
3567 #define btrfs_abort_transaction(trans, errno)           \
3568 do {                                                            \
3569         /* Report first abort since mount */                    \
3570         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
3571                         &((trans)->fs_info->fs_state))) {       \
3572                 if ((errno) != -EIO) {                          \
3573                         WARN(1, KERN_DEBUG                              \
3574                         "BTRFS: Transaction aborted (error %d)\n",      \
3575                         (errno));                                       \
3576                 } else {                                                \
3577                         btrfs_debug((trans)->fs_info,                   \
3578                                     "Transaction aborted (error %d)", \
3579                                   (errno));                     \
3580                 }                                               \
3581         }                                                       \
3582         __btrfs_abort_transaction((trans), __func__,            \
3583                                   __LINE__, (errno));           \
3584 } while (0)
3585 
3586 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)             \
3587 do {                                                            \
3588         __btrfs_handle_fs_error((fs_info), __func__, __LINE__,  \
3589                           (errno), fmt, ##args);                \
3590 } while (0)
3591 
3592 __printf(5, 6)
3593 __cold
3594 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3595                    unsigned int line, int errno, const char *fmt, ...);
3596 /*
3597  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3598  * will panic().  Otherwise we BUG() here.
3599  */
3600 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
3601 do {                                                                    \
3602         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3603         BUG();                                                          \
3604 } while (0)
3605 
3606 
3607 /* compatibility and incompatibility defines */
3608 
3609 #define btrfs_set_fs_incompat(__fs_info, opt) \
3610         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3611 
3612 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3613                                            u64 flag)
3614 {
3615         struct btrfs_super_block *disk_super;
3616         u64 features;
3617 
3618         disk_super = fs_info->super_copy;
3619         features = btrfs_super_incompat_flags(disk_super);
3620         if (!(features & flag)) {
3621                 spin_lock(&fs_info->super_lock);
3622                 features = btrfs_super_incompat_flags(disk_super);
3623                 if (!(features & flag)) {
3624                         features |= flag;
3625                         btrfs_set_super_incompat_flags(disk_super, features);
3626                         btrfs_info(fs_info, "setting %llu feature flag",
3627                                          flag);
3628                 }
3629                 spin_unlock(&fs_info->super_lock);
3630         }
3631 }
3632 
3633 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3634         __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3635 
3636 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3637                                              u64 flag)
3638 {
3639         struct btrfs_super_block *disk_super;
3640         u64 features;
3641 
3642         disk_super = fs_info->super_copy;
3643         features = btrfs_super_incompat_flags(disk_super);
3644         if (features & flag) {
3645                 spin_lock(&fs_info->super_lock);
3646                 features = btrfs_super_incompat_flags(disk_super);
3647                 if (features & flag) {
3648                         features &= ~flag;
3649                         btrfs_set_super_incompat_flags(disk_super, features);
3650                         btrfs_info(fs_info, "clearing %llu feature flag",
3651                                          flag);
3652                 }
3653                 spin_unlock(&fs_info->super_lock);
3654         }
3655 }
3656 
3657 #define btrfs_fs_incompat(fs_info, opt) \
3658         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3659 
3660 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3661 {
3662         struct btrfs_super_block *disk_super;
3663         disk_super = fs_info->super_copy;
3664         return !!(btrfs_super_incompat_flags(disk_super) & flag);
3665 }
3666 
3667 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3668         __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3669 
3670 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3671                                             u64 flag)
3672 {
3673         struct btrfs_super_block *disk_super;
3674         u64 features;
3675 
3676         disk_super = fs_info->super_copy;
3677         features = btrfs_super_compat_ro_flags(disk_super);
3678         if (!(features & flag)) {
3679                 spin_lock(&fs_info->super_lock);
3680                 features = btrfs_super_compat_ro_flags(disk_super);
3681                 if (!(features & flag)) {
3682                         features |= flag;
3683                         btrfs_set_super_compat_ro_flags(disk_super, features);
3684                         btrfs_info(fs_info, "setting %llu ro feature flag",
3685                                    flag);
3686                 }
3687                 spin_unlock(&fs_info->super_lock);
3688         }
3689 }
3690 
3691 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3692         __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3693 
3694 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3695                                               u64 flag)
3696 {
3697         struct btrfs_super_block *disk_super;
3698         u64 features;
3699 
3700         disk_super = fs_info->super_copy;
3701         features = btrfs_super_compat_ro_flags(disk_super);
3702         if (features & flag) {
3703                 spin_lock(&fs_info->super_lock);
3704                 features = btrfs_super_compat_ro_flags(disk_super);
3705                 if (features & flag) {
3706                         features &= ~flag;
3707                         btrfs_set_super_compat_ro_flags(disk_super, features);
3708                         btrfs_info(fs_info, "clearing %llu ro feature flag",
3709                                    flag);
3710                 }
3711                 spin_unlock(&fs_info->super_lock);
3712         }
3713 }
3714 
3715 #define btrfs_fs_compat_ro(fs_info, opt) \
3716         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3717 
3718 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3719 {
3720         struct btrfs_super_block *disk_super;
3721         disk_super = fs_info->super_copy;
3722         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3723 }
3724 
3725 /* acl.c */
3726 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3727 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3728 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3729 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3730                    struct inode *inode, struct inode *dir);
3731 #else
3732 #define btrfs_get_acl NULL
3733 #define btrfs_set_acl NULL
3734 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3735                                  struct inode *inode, struct inode *dir)
3736 {
3737         return 0;
3738 }
3739 #endif
3740 
3741 /* relocation.c */
3742 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3743 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3744                           struct btrfs_root *root);
3745 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3746                             struct btrfs_root *root);
3747 int btrfs_recover_relocation(struct btrfs_root *root);
3748 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3749 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3750                           struct btrfs_root *root, struct extent_buffer *buf,
3751                           struct extent_buffer *cow);
3752 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3753                               u64 *bytes_to_reserve);
3754 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3755                               struct btrfs_pending_snapshot *pending);
3756 
3757 /* scrub.c */
3758 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3759                     u64 end, struct btrfs_scrub_progress *progress,
3760                     int readonly, int is_dev_replace);
3761 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3762 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3763 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3764 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3765                            struct btrfs_device *dev);
3766 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3767                          struct btrfs_scrub_progress *progress);
3768 static inline void btrfs_init_full_stripe_locks_tree(
3769                         struct btrfs_full_stripe_locks_tree *locks_root)
3770 {
3771         locks_root->root = RB_ROOT;
3772         mutex_init(&locks_root->lock);
3773 }
3774 
3775 /* dev-replace.c */
3776 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3777 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3778 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3779 
3780 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3781 {
3782         btrfs_bio_counter_sub(fs_info, 1);
3783 }
3784 
3785 /* reada.c */
3786 struct reada_control {
3787         struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
3788         struct btrfs_key        key_start;
3789         struct btrfs_key        key_end;        /* exclusive */
3790         atomic_t                elems;
3791         struct kref             refcnt;
3792         wait_queue_head_t       wait;
3793 };
3794 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3795                               struct btrfs_key *start, struct btrfs_key *end);
3796 int btrfs_reada_wait(void *handle);
3797 void btrfs_reada_detach(void *handle);
3798 int btree_readahead_hook(struct extent_buffer *eb, int err);
3799 
3800 static inline int is_fstree(u64 rootid)
3801 {
3802         if (rootid == BTRFS_FS_TREE_OBJECTID ||
3803             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3804               !btrfs_qgroup_level(rootid)))
3805                 return 1;
3806         return 0;
3807 }
3808 
3809 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3810 {
3811         return signal_pending(current);
3812 }
3813 
3814 /* Sanity test specific functions */
3815 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3816 void btrfs_test_inode_set_ops(struct inode *inode);
3817 void btrfs_test_destroy_inode(struct inode *inode);
3818 
3819 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3820 {
3821         return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3822 }
3823 #else
3824 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3825 {
3826         return 0;
3827 }
3828 #endif
3829 
3830 static inline void cond_wake_up(struct wait_queue_head *wq)
3831 {
3832         /*
3833          * This implies a full smp_mb barrier, see comments for
3834          * waitqueue_active why.
3835          */
3836         if (wq_has_sleeper(wq))
3837                 wake_up(wq);
3838 }
3839 
3840 static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
3841 {
3842         /*
3843          * Special case for conditional wakeup where the barrier required for
3844          * waitqueue_active is implied by some of the preceding code. Eg. one
3845          * of such atomic operations (atomic_dec_and_return, ...), or a
3846          * unlock/lock sequence, etc.
3847          */
3848         if (waitqueue_active(wq))
3849                 wake_up(wq);
3850 }
3851 
3852 #endif
3853 

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