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

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  1 /*
  2  * Copyright (C) 2007 Oracle.  All rights reserved.
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public
  6  * License v2 as published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 11  * General Public License for more details.
 12  *
 13  * You should have received a copy of the GNU General Public
 14  * License along with this program; if not, write to the
 15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 16  * Boston, MA 021110-1307, USA.
 17  */
 18 
 19 #ifndef __BTRFS_CTREE__
 20 #define __BTRFS_CTREE__
 21 
 22 #include <linux/mm.h>
 23 #include <linux/sched/signal.h>
 24 #include <linux/highmem.h>
 25 #include <linux/fs.h>
 26 #include <linux/rwsem.h>
 27 #include <linux/semaphore.h>
 28 #include <linux/completion.h>
 29 #include <linux/backing-dev.h>
 30 #include <linux/wait.h>
 31 #include <linux/slab.h>
 32 #include <linux/kobject.h>
 33 #include <trace/events/btrfs.h>
 34 #include <asm/kmap_types.h>
 35 #include <linux/pagemap.h>
 36 #include <linux/btrfs.h>
 37 #include <linux/btrfs_tree.h>
 38 #include <linux/workqueue.h>
 39 #include <linux/security.h>
 40 #include <linux/sizes.h>
 41 #include <linux/dynamic_debug.h>
 42 #include <linux/refcount.h>
 43 #include "extent_io.h"
 44 #include "extent_map.h"
 45 #include "async-thread.h"
 46 
 47 struct btrfs_trans_handle;
 48 struct btrfs_transaction;
 49 struct btrfs_pending_snapshot;
 50 extern struct kmem_cache *btrfs_trans_handle_cachep;
 51 extern struct kmem_cache *btrfs_bit_radix_cachep;
 52 extern struct kmem_cache *btrfs_path_cachep;
 53 extern struct kmem_cache *btrfs_free_space_cachep;
 54 struct btrfs_ordered_sum;
 55 
 56 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 57 #define STATIC noinline
 58 #else
 59 #define STATIC static noinline
 60 #endif
 61 
 62 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
 63 
 64 #define BTRFS_MAX_MIRRORS 3
 65 
 66 #define BTRFS_MAX_LEVEL 8
 67 
 68 #define BTRFS_COMPAT_EXTENT_TREE_V0
 69 
 70 /*
 71  * the max metadata block size.  This limit is somewhat artificial,
 72  * but the memmove costs go through the roof for larger blocks.
 73  */
 74 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 75 
 76 /*
 77  * we can actually store much bigger names, but lets not confuse the rest
 78  * of linux
 79  */
 80 #define BTRFS_NAME_LEN 255
 81 
 82 /*
 83  * Theoretical limit is larger, but we keep this down to a sane
 84  * value. That should limit greatly the possibility of collisions on
 85  * inode ref items.
 86  */
 87 #define BTRFS_LINK_MAX 65535U
 88 
 89 static const int btrfs_csum_sizes[] = { 4 };
 90 
 91 /* four bytes for CRC32 */
 92 #define BTRFS_EMPTY_DIR_SIZE 0
 93 
 94 /* ioprio of readahead is set to idle */
 95 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
 96 
 97 #define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
 98 
 99 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
100 
101 /*
102  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
103  */
104 static inline u32 count_max_extents(u64 size)
105 {
106         return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
107 }
108 
109 struct btrfs_mapping_tree {
110         struct extent_map_tree map_tree;
111 };
112 
113 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
114 {
115         BUG_ON(num_stripes == 0);
116         return sizeof(struct btrfs_chunk) +
117                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
118 }
119 
120 /*
121  * File system states
122  */
123 #define BTRFS_FS_STATE_ERROR            0
124 #define BTRFS_FS_STATE_REMOUNTING       1
125 #define BTRFS_FS_STATE_TRANS_ABORTED    2
126 #define BTRFS_FS_STATE_DEV_REPLACING    3
127 #define BTRFS_FS_STATE_DUMMY_FS_INFO    4
128 
129 #define BTRFS_BACKREF_REV_MAX           256
130 #define BTRFS_BACKREF_REV_SHIFT         56
131 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
132                                          BTRFS_BACKREF_REV_SHIFT)
133 
134 #define BTRFS_OLD_BACKREF_REV           0
135 #define BTRFS_MIXED_BACKREF_REV         1
136 
137 /*
138  * every tree block (leaf or node) starts with this header.
139  */
140 struct btrfs_header {
141         /* these first four must match the super block */
142         u8 csum[BTRFS_CSUM_SIZE];
143         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
144         __le64 bytenr; /* which block this node is supposed to live in */
145         __le64 flags;
146 
147         /* allowed to be different from the super from here on down */
148         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
149         __le64 generation;
150         __le64 owner;
151         __le32 nritems;
152         u8 level;
153 } __attribute__ ((__packed__));
154 
155 /*
156  * this is a very generous portion of the super block, giving us
157  * room to translate 14 chunks with 3 stripes each.
158  */
159 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
160 
161 /*
162  * just in case we somehow lose the roots and are not able to mount,
163  * we store an array of the roots from previous transactions
164  * in the super.
165  */
166 #define BTRFS_NUM_BACKUP_ROOTS 4
167 struct btrfs_root_backup {
168         __le64 tree_root;
169         __le64 tree_root_gen;
170 
171         __le64 chunk_root;
172         __le64 chunk_root_gen;
173 
174         __le64 extent_root;
175         __le64 extent_root_gen;
176 
177         __le64 fs_root;
178         __le64 fs_root_gen;
179 
180         __le64 dev_root;
181         __le64 dev_root_gen;
182 
183         __le64 csum_root;
184         __le64 csum_root_gen;
185 
186         __le64 total_bytes;
187         __le64 bytes_used;
188         __le64 num_devices;
189         /* future */
190         __le64 unused_64[4];
191 
192         u8 tree_root_level;
193         u8 chunk_root_level;
194         u8 extent_root_level;
195         u8 fs_root_level;
196         u8 dev_root_level;
197         u8 csum_root_level;
198         /* future and to align */
199         u8 unused_8[10];
200 } __attribute__ ((__packed__));
201 
202 /*
203  * the super block basically lists the main trees of the FS
204  * it currently lacks any block count etc etc
205  */
206 struct btrfs_super_block {
207         u8 csum[BTRFS_CSUM_SIZE];
208         /* the first 4 fields must match struct btrfs_header */
209         u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
210         __le64 bytenr; /* this block number */
211         __le64 flags;
212 
213         /* allowed to be different from the btrfs_header from here own down */
214         __le64 magic;
215         __le64 generation;
216         __le64 root;
217         __le64 chunk_root;
218         __le64 log_root;
219 
220         /* this will help find the new super based on the log root */
221         __le64 log_root_transid;
222         __le64 total_bytes;
223         __le64 bytes_used;
224         __le64 root_dir_objectid;
225         __le64 num_devices;
226         __le32 sectorsize;
227         __le32 nodesize;
228         __le32 __unused_leafsize;
229         __le32 stripesize;
230         __le32 sys_chunk_array_size;
231         __le64 chunk_root_generation;
232         __le64 compat_flags;
233         __le64 compat_ro_flags;
234         __le64 incompat_flags;
235         __le16 csum_type;
236         u8 root_level;
237         u8 chunk_root_level;
238         u8 log_root_level;
239         struct btrfs_dev_item dev_item;
240 
241         char label[BTRFS_LABEL_SIZE];
242 
243         __le64 cache_generation;
244         __le64 uuid_tree_generation;
245 
246         /* future expansion */
247         __le64 reserved[30];
248         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
249         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
250 } __attribute__ ((__packed__));
251 
252 /*
253  * Compat flags that we support.  If any incompat flags are set other than the
254  * ones specified below then we will fail to mount
255  */
256 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
257 #define BTRFS_FEATURE_COMPAT_SAFE_SET           0ULL
258 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR         0ULL
259 
260 #define BTRFS_FEATURE_COMPAT_RO_SUPP                    \
261         (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |      \
262          BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
263 
264 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET        0ULL
265 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR      0ULL
266 
267 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
268         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
269          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
270          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
271          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
272          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
273          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
274          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
275          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
276          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
277          BTRFS_FEATURE_INCOMPAT_NO_HOLES)
278 
279 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                 \
280         (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
281 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR               0ULL
282 
283 /*
284  * A leaf is full of items. offset and size tell us where to find
285  * the item in the leaf (relative to the start of the data area)
286  */
287 struct btrfs_item {
288         struct btrfs_disk_key key;
289         __le32 offset;
290         __le32 size;
291 } __attribute__ ((__packed__));
292 
293 /*
294  * leaves have an item area and a data area:
295  * [item0, item1....itemN] [free space] [dataN...data1, data0]
296  *
297  * The data is separate from the items to get the keys closer together
298  * during searches.
299  */
300 struct btrfs_leaf {
301         struct btrfs_header header;
302         struct btrfs_item items[];
303 } __attribute__ ((__packed__));
304 
305 /*
306  * all non-leaf blocks are nodes, they hold only keys and pointers to
307  * other blocks
308  */
309 struct btrfs_key_ptr {
310         struct btrfs_disk_key key;
311         __le64 blockptr;
312         __le64 generation;
313 } __attribute__ ((__packed__));
314 
315 struct btrfs_node {
316         struct btrfs_header header;
317         struct btrfs_key_ptr ptrs[];
318 } __attribute__ ((__packed__));
319 
320 /*
321  * btrfs_paths remember the path taken from the root down to the leaf.
322  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
323  * to any other levels that are present.
324  *
325  * The slots array records the index of the item or block pointer
326  * used while walking the tree.
327  */
328 enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
329 struct btrfs_path {
330         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
331         int slots[BTRFS_MAX_LEVEL];
332         /* if there is real range locking, this locks field will change */
333         u8 locks[BTRFS_MAX_LEVEL];
334         u8 reada;
335         /* keep some upper locks as we walk down */
336         u8 lowest_level;
337 
338         /*
339          * set by btrfs_split_item, tells search_slot to keep all locks
340          * and to force calls to keep space in the nodes
341          */
342         unsigned int search_for_split:1;
343         unsigned int keep_locks:1;
344         unsigned int skip_locking:1;
345         unsigned int leave_spinning:1;
346         unsigned int search_commit_root:1;
347         unsigned int need_commit_sem:1;
348         unsigned int skip_release_on_error:1;
349 };
350 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
351                                         sizeof(struct btrfs_item))
352 struct btrfs_dev_replace {
353         u64 replace_state;      /* see #define above */
354         u64 time_started;       /* seconds since 1-Jan-1970 */
355         u64 time_stopped;       /* seconds since 1-Jan-1970 */
356         atomic64_t num_write_errors;
357         atomic64_t num_uncorrectable_read_errors;
358 
359         u64 cursor_left;
360         u64 committed_cursor_left;
361         u64 cursor_left_last_write_of_item;
362         u64 cursor_right;
363 
364         u64 cont_reading_from_srcdev_mode;      /* see #define above */
365 
366         int is_valid;
367         int item_needs_writeback;
368         struct btrfs_device *srcdev;
369         struct btrfs_device *tgtdev;
370 
371         pid_t lock_owner;
372         atomic_t nesting_level;
373         struct mutex lock_finishing_cancel_unmount;
374         rwlock_t lock;
375         atomic_t read_locks;
376         atomic_t blocking_readers;
377         wait_queue_head_t read_lock_wq;
378 
379         struct btrfs_scrub_progress scrub_progress;
380 };
381 
382 /* For raid type sysfs entries */
383 struct raid_kobject {
384         int raid_type;
385         struct kobject kobj;
386 };
387 
388 struct btrfs_space_info {
389         spinlock_t lock;
390 
391         u64 total_bytes;        /* total bytes in the space,
392                                    this doesn't take mirrors into account */
393         u64 bytes_used;         /* total bytes used,
394                                    this doesn't take mirrors into account */
395         u64 bytes_pinned;       /* total bytes pinned, will be freed when the
396                                    transaction finishes */
397         u64 bytes_reserved;     /* total bytes the allocator has reserved for
398                                    current allocations */
399         u64 bytes_may_use;      /* number of bytes that may be used for
400                                    delalloc/allocations */
401         u64 bytes_readonly;     /* total bytes that are read only */
402 
403         u64 max_extent_size;    /* This will hold the maximum extent size of
404                                    the space info if we had an ENOSPC in the
405                                    allocator. */
406 
407         unsigned int full:1;    /* indicates that we cannot allocate any more
408                                    chunks for this space */
409         unsigned int chunk_alloc:1;     /* set if we are allocating a chunk */
410 
411         unsigned int flush:1;           /* set if we are trying to make space */
412 
413         unsigned int force_alloc;       /* set if we need to force a chunk
414                                            alloc for this space */
415 
416         u64 disk_used;          /* total bytes used on disk */
417         u64 disk_total;         /* total bytes on disk, takes mirrors into
418                                    account */
419 
420         u64 flags;
421 
422         /*
423          * bytes_pinned is kept in line with what is actually pinned, as in
424          * we've called update_block_group and dropped the bytes_used counter
425          * and increased the bytes_pinned counter.  However this means that
426          * bytes_pinned does not reflect the bytes that will be pinned once the
427          * delayed refs are flushed, so this counter is inc'ed every time we
428          * call btrfs_free_extent so it is a realtime count of what will be
429          * freed once the transaction is committed.  It will be zeroed every
430          * time the transaction commits.
431          */
432         struct percpu_counter total_bytes_pinned;
433 
434         struct list_head list;
435         /* Protected by the spinlock 'lock'. */
436         struct list_head ro_bgs;
437         struct list_head priority_tickets;
438         struct list_head tickets;
439         /*
440          * tickets_id just indicates the next ticket will be handled, so note
441          * it's not stored per ticket.
442          */
443         u64 tickets_id;
444 
445         struct rw_semaphore groups_sem;
446         /* for block groups in our same type */
447         struct list_head block_groups[BTRFS_NR_RAID_TYPES];
448         wait_queue_head_t wait;
449 
450         struct kobject kobj;
451         struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
452 };
453 
454 #define BTRFS_BLOCK_RSV_GLOBAL          1
455 #define BTRFS_BLOCK_RSV_DELALLOC        2
456 #define BTRFS_BLOCK_RSV_TRANS           3
457 #define BTRFS_BLOCK_RSV_CHUNK           4
458 #define BTRFS_BLOCK_RSV_DELOPS          5
459 #define BTRFS_BLOCK_RSV_EMPTY           6
460 #define BTRFS_BLOCK_RSV_TEMP            7
461 
462 struct btrfs_block_rsv {
463         u64 size;
464         u64 reserved;
465         struct btrfs_space_info *space_info;
466         spinlock_t lock;
467         unsigned short full;
468         unsigned short type;
469         unsigned short failfast;
470 };
471 
472 /*
473  * free clusters are used to claim free space in relatively large chunks,
474  * allowing us to do less seeky writes. They are used for all metadata
475  * allocations. In ssd_spread mode they are also used for data allocations.
476  */
477 struct btrfs_free_cluster {
478         spinlock_t lock;
479         spinlock_t refill_lock;
480         struct rb_root root;
481 
482         /* largest extent in this cluster */
483         u64 max_size;
484 
485         /* first extent starting offset */
486         u64 window_start;
487 
488         /* We did a full search and couldn't create a cluster */
489         bool fragmented;
490 
491         struct btrfs_block_group_cache *block_group;
492         /*
493          * when a cluster is allocated from a block group, we put the
494          * cluster onto a list in the block group so that it can
495          * be freed before the block group is freed.
496          */
497         struct list_head block_group_list;
498 };
499 
500 enum btrfs_caching_type {
501         BTRFS_CACHE_NO          = 0,
502         BTRFS_CACHE_STARTED     = 1,
503         BTRFS_CACHE_FAST        = 2,
504         BTRFS_CACHE_FINISHED    = 3,
505         BTRFS_CACHE_ERROR       = 4,
506 };
507 
508 enum btrfs_disk_cache_state {
509         BTRFS_DC_WRITTEN        = 0,
510         BTRFS_DC_ERROR          = 1,
511         BTRFS_DC_CLEAR          = 2,
512         BTRFS_DC_SETUP          = 3,
513 };
514 
515 struct btrfs_caching_control {
516         struct list_head list;
517         struct mutex mutex;
518         wait_queue_head_t wait;
519         struct btrfs_work work;
520         struct btrfs_block_group_cache *block_group;
521         u64 progress;
522         refcount_t count;
523 };
524 
525 /* Once caching_thread() finds this much free space, it will wake up waiters. */
526 #define CACHING_CTL_WAKE_UP SZ_2M
527 
528 struct btrfs_io_ctl {
529         void *cur, *orig;
530         struct page *page;
531         struct page **pages;
532         struct btrfs_fs_info *fs_info;
533         struct inode *inode;
534         unsigned long size;
535         int index;
536         int num_pages;
537         int entries;
538         int bitmaps;
539         unsigned check_crcs:1;
540 };
541 
542 /*
543  * Tree to record all locked full stripes of a RAID5/6 block group
544  */
545 struct btrfs_full_stripe_locks_tree {
546         struct rb_root root;
547         struct mutex lock;
548 };
549 
550 struct btrfs_block_group_cache {
551         struct btrfs_key key;
552         struct btrfs_block_group_item item;
553         struct btrfs_fs_info *fs_info;
554         struct inode *inode;
555         spinlock_t lock;
556         u64 pinned;
557         u64 reserved;
558         u64 delalloc_bytes;
559         u64 bytes_super;
560         u64 flags;
561         u64 cache_generation;
562 
563         /*
564          * If the free space extent count exceeds this number, convert the block
565          * group to bitmaps.
566          */
567         u32 bitmap_high_thresh;
568 
569         /*
570          * If the free space extent count drops below this number, convert the
571          * block group back to extents.
572          */
573         u32 bitmap_low_thresh;
574 
575         /*
576          * It is just used for the delayed data space allocation because
577          * only the data space allocation and the relative metadata update
578          * can be done cross the transaction.
579          */
580         struct rw_semaphore data_rwsem;
581 
582         /* for raid56, this is a full stripe, without parity */
583         unsigned long full_stripe_len;
584 
585         unsigned int ro;
586         unsigned int iref:1;
587         unsigned int has_caching_ctl:1;
588         unsigned int removed:1;
589 
590         int disk_cache_state;
591 
592         /* cache tracking stuff */
593         int cached;
594         struct btrfs_caching_control *caching_ctl;
595         u64 last_byte_to_unpin;
596 
597         struct btrfs_space_info *space_info;
598 
599         /* free space cache stuff */
600         struct btrfs_free_space_ctl *free_space_ctl;
601 
602         /* block group cache stuff */
603         struct rb_node cache_node;
604 
605         /* for block groups in the same raid type */
606         struct list_head list;
607 
608         /* usage count */
609         atomic_t count;
610 
611         /* List of struct btrfs_free_clusters for this block group.
612          * Today it will only have one thing on it, but that may change
613          */
614         struct list_head cluster_list;
615 
616         /* For delayed block group creation or deletion of empty block groups */
617         struct list_head bg_list;
618 
619         /* For read-only block groups */
620         struct list_head ro_list;
621 
622         atomic_t trimming;
623 
624         /* For dirty block groups */
625         struct list_head dirty_list;
626         struct list_head io_list;
627 
628         struct btrfs_io_ctl io_ctl;
629 
630         /*
631          * Incremented when doing extent allocations and holding a read lock
632          * on the space_info's groups_sem semaphore.
633          * Decremented when an ordered extent that represents an IO against this
634          * block group's range is created (after it's added to its inode's
635          * root's list of ordered extents) or immediately after the allocation
636          * if it's a metadata extent or fallocate extent (for these cases we
637          * don't create ordered extents).
638          */
639         atomic_t reservations;
640 
641         /*
642          * Incremented while holding the spinlock *lock* by a task checking if
643          * it can perform a nocow write (incremented if the value for the *ro*
644          * field is 0). Decremented by such tasks once they create an ordered
645          * extent or before that if some error happens before reaching that step.
646          * This is to prevent races between block group relocation and nocow
647          * writes through direct IO.
648          */
649         atomic_t nocow_writers;
650 
651         /* Lock for free space tree operations. */
652         struct mutex free_space_lock;
653 
654         /*
655          * Does the block group need to be added to the free space tree?
656          * Protected by free_space_lock.
657          */
658         int needs_free_space;
659 
660         /* Record locked full stripes for RAID5/6 block group */
661         struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
662 };
663 
664 /* delayed seq elem */
665 struct seq_list {
666         struct list_head list;
667         u64 seq;
668 };
669 
670 #define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
671 
672 #define SEQ_LAST        ((u64)-1)
673 
674 enum btrfs_orphan_cleanup_state {
675         ORPHAN_CLEANUP_STARTED  = 1,
676         ORPHAN_CLEANUP_DONE     = 2,
677 };
678 
679 /* used by the raid56 code to lock stripes for read/modify/write */
680 struct btrfs_stripe_hash {
681         struct list_head hash_list;
682         spinlock_t lock;
683 };
684 
685 /* used by the raid56 code to lock stripes for read/modify/write */
686 struct btrfs_stripe_hash_table {
687         struct list_head stripe_cache;
688         spinlock_t cache_lock;
689         int cache_size;
690         struct btrfs_stripe_hash table[];
691 };
692 
693 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
694 
695 void btrfs_init_async_reclaim_work(struct work_struct *work);
696 
697 /* fs_info */
698 struct reloc_control;
699 struct btrfs_device;
700 struct btrfs_fs_devices;
701 struct btrfs_balance_control;
702 struct btrfs_delayed_root;
703 
704 #define BTRFS_FS_BARRIER                        1
705 #define BTRFS_FS_CLOSING_START                  2
706 #define BTRFS_FS_CLOSING_DONE                   3
707 #define BTRFS_FS_LOG_RECOVERING                 4
708 #define BTRFS_FS_OPEN                           5
709 #define BTRFS_FS_QUOTA_ENABLED                  6
710 #define BTRFS_FS_QUOTA_ENABLING                 7
711 #define BTRFS_FS_UPDATE_UUID_TREE_GEN           9
712 #define BTRFS_FS_CREATING_FREE_SPACE_TREE       10
713 #define BTRFS_FS_BTREE_ERR                      11
714 #define BTRFS_FS_LOG1_ERR                       12
715 #define BTRFS_FS_LOG2_ERR                       13
716 #define BTRFS_FS_QUOTA_OVERRIDE                 14
717 /* Used to record internally whether fs has been frozen */
718 #define BTRFS_FS_FROZEN                         15
719 
720 /*
721  * Indicate that a whole-filesystem exclusive operation is running
722  * (device replace, resize, device add/delete, balance)
723  */
724 #define BTRFS_FS_EXCL_OP                        16
725 
726 struct btrfs_fs_info {
727         u8 fsid[BTRFS_FSID_SIZE];
728         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
729         unsigned long flags;
730         struct btrfs_root *extent_root;
731         struct btrfs_root *tree_root;
732         struct btrfs_root *chunk_root;
733         struct btrfs_root *dev_root;
734         struct btrfs_root *fs_root;
735         struct btrfs_root *csum_root;
736         struct btrfs_root *quota_root;
737         struct btrfs_root *uuid_root;
738         struct btrfs_root *free_space_root;
739 
740         /* the log root tree is a directory of all the other log roots */
741         struct btrfs_root *log_root_tree;
742 
743         spinlock_t fs_roots_radix_lock;
744         struct radix_tree_root fs_roots_radix;
745 
746         /* block group cache stuff */
747         spinlock_t block_group_cache_lock;
748         u64 first_logical_byte;
749         struct rb_root block_group_cache_tree;
750 
751         /* keep track of unallocated space */
752         atomic64_t free_chunk_space;
753 
754         struct extent_io_tree freed_extents[2];
755         struct extent_io_tree *pinned_extents;
756 
757         /* logical->physical extent mapping */
758         struct btrfs_mapping_tree mapping_tree;
759 
760         /*
761          * block reservation for extent, checksum, root tree and
762          * delayed dir index item
763          */
764         struct btrfs_block_rsv global_block_rsv;
765         /* block reservation for metadata operations */
766         struct btrfs_block_rsv trans_block_rsv;
767         /* block reservation for chunk tree */
768         struct btrfs_block_rsv chunk_block_rsv;
769         /* block reservation for delayed operations */
770         struct btrfs_block_rsv delayed_block_rsv;
771 
772         struct btrfs_block_rsv empty_block_rsv;
773 
774         u64 generation;
775         u64 last_trans_committed;
776         u64 avg_delayed_ref_runtime;
777 
778         /*
779          * this is updated to the current trans every time a full commit
780          * is required instead of the faster short fsync log commits
781          */
782         u64 last_trans_log_full_commit;
783         unsigned long mount_opt;
784         /*
785          * Track requests for actions that need to be done during transaction
786          * commit (like for some mount options).
787          */
788         unsigned long pending_changes;
789         unsigned long compress_type:4;
790         unsigned int compress_level;
791         int commit_interval;
792         /*
793          * It is a suggestive number, the read side is safe even it gets a
794          * wrong number because we will write out the data into a regular
795          * extent. The write side(mount/remount) is under ->s_umount lock,
796          * so it is also safe.
797          */
798         u64 max_inline;
799 
800         struct btrfs_transaction *running_transaction;
801         wait_queue_head_t transaction_throttle;
802         wait_queue_head_t transaction_wait;
803         wait_queue_head_t transaction_blocked_wait;
804         wait_queue_head_t async_submit_wait;
805 
806         /*
807          * Used to protect the incompat_flags, compat_flags, compat_ro_flags
808          * when they are updated.
809          *
810          * Because we do not clear the flags for ever, so we needn't use
811          * the lock on the read side.
812          *
813          * We also needn't use the lock when we mount the fs, because
814          * there is no other task which will update the flag.
815          */
816         spinlock_t super_lock;
817         struct btrfs_super_block *super_copy;
818         struct btrfs_super_block *super_for_commit;
819         struct super_block *sb;
820         struct inode *btree_inode;
821         struct mutex tree_log_mutex;
822         struct mutex transaction_kthread_mutex;
823         struct mutex cleaner_mutex;
824         struct mutex chunk_mutex;
825         struct mutex volume_mutex;
826 
827         /*
828          * this is taken to make sure we don't set block groups ro after
829          * the free space cache has been allocated on them
830          */
831         struct mutex ro_block_group_mutex;
832 
833         /* this is used during read/modify/write to make sure
834          * no two ios are trying to mod the same stripe at the same
835          * time
836          */
837         struct btrfs_stripe_hash_table *stripe_hash_table;
838 
839         /*
840          * this protects the ordered operations list only while we are
841          * processing all of the entries on it.  This way we make
842          * sure the commit code doesn't find the list temporarily empty
843          * because another function happens to be doing non-waiting preflush
844          * before jumping into the main commit.
845          */
846         struct mutex ordered_operations_mutex;
847 
848         struct rw_semaphore commit_root_sem;
849 
850         struct rw_semaphore cleanup_work_sem;
851 
852         struct rw_semaphore subvol_sem;
853         struct srcu_struct subvol_srcu;
854 
855         spinlock_t trans_lock;
856         /*
857          * the reloc mutex goes with the trans lock, it is taken
858          * during commit to protect us from the relocation code
859          */
860         struct mutex reloc_mutex;
861 
862         struct list_head trans_list;
863         struct list_head dead_roots;
864         struct list_head caching_block_groups;
865 
866         spinlock_t delayed_iput_lock;
867         struct list_head delayed_iputs;
868         struct mutex cleaner_delayed_iput_mutex;
869 
870         /* this protects tree_mod_seq_list */
871         spinlock_t tree_mod_seq_lock;
872         atomic64_t tree_mod_seq;
873         struct list_head tree_mod_seq_list;
874 
875         /* this protects tree_mod_log */
876         rwlock_t tree_mod_log_lock;
877         struct rb_root tree_mod_log;
878 
879         atomic_t async_delalloc_pages;
880         atomic_t open_ioctl_trans;
881 
882         /*
883          * this is used to protect the following list -- ordered_roots.
884          */
885         spinlock_t ordered_root_lock;
886 
887         /*
888          * all fs/file tree roots in which there are data=ordered extents
889          * pending writeback are added into this list.
890          *
891          * these can span multiple transactions and basically include
892          * every dirty data page that isn't from nodatacow
893          */
894         struct list_head ordered_roots;
895 
896         struct mutex delalloc_root_mutex;
897         spinlock_t delalloc_root_lock;
898         /* all fs/file tree roots that have delalloc inodes. */
899         struct list_head delalloc_roots;
900 
901         /*
902          * there is a pool of worker threads for checksumming during writes
903          * and a pool for checksumming after reads.  This is because readers
904          * can run with FS locks held, and the writers may be waiting for
905          * those locks.  We don't want ordering in the pending list to cause
906          * deadlocks, and so the two are serviced separately.
907          *
908          * A third pool does submit_bio to avoid deadlocking with the other
909          * two
910          */
911         struct btrfs_workqueue *workers;
912         struct btrfs_workqueue *delalloc_workers;
913         struct btrfs_workqueue *flush_workers;
914         struct btrfs_workqueue *endio_workers;
915         struct btrfs_workqueue *endio_meta_workers;
916         struct btrfs_workqueue *endio_raid56_workers;
917         struct btrfs_workqueue *endio_repair_workers;
918         struct btrfs_workqueue *rmw_workers;
919         struct btrfs_workqueue *endio_meta_write_workers;
920         struct btrfs_workqueue *endio_write_workers;
921         struct btrfs_workqueue *endio_freespace_worker;
922         struct btrfs_workqueue *submit_workers;
923         struct btrfs_workqueue *caching_workers;
924         struct btrfs_workqueue *readahead_workers;
925 
926         /*
927          * fixup workers take dirty pages that didn't properly go through
928          * the cow mechanism and make them safe to write.  It happens
929          * for the sys_munmap function call path
930          */
931         struct btrfs_workqueue *fixup_workers;
932         struct btrfs_workqueue *delayed_workers;
933 
934         /* the extent workers do delayed refs on the extent allocation tree */
935         struct btrfs_workqueue *extent_workers;
936         struct task_struct *transaction_kthread;
937         struct task_struct *cleaner_kthread;
938         int thread_pool_size;
939 
940         struct kobject *space_info_kobj;
941 
942         u64 total_pinned;
943 
944         /* used to keep from writing metadata until there is a nice batch */
945         struct percpu_counter dirty_metadata_bytes;
946         struct percpu_counter delalloc_bytes;
947         s32 dirty_metadata_batch;
948         s32 delalloc_batch;
949 
950         struct list_head dirty_cowonly_roots;
951 
952         struct btrfs_fs_devices *fs_devices;
953 
954         /*
955          * the space_info list is almost entirely read only.  It only changes
956          * when we add a new raid type to the FS, and that happens
957          * very rarely.  RCU is used to protect it.
958          */
959         struct list_head space_info;
960 
961         struct btrfs_space_info *data_sinfo;
962 
963         struct reloc_control *reloc_ctl;
964 
965         /* data_alloc_cluster is only used in ssd_spread mode */
966         struct btrfs_free_cluster data_alloc_cluster;
967 
968         /* all metadata allocations go through this cluster */
969         struct btrfs_free_cluster meta_alloc_cluster;
970 
971         /* auto defrag inodes go here */
972         spinlock_t defrag_inodes_lock;
973         struct rb_root defrag_inodes;
974         atomic_t defrag_running;
975 
976         /* Used to protect avail_{data, metadata, system}_alloc_bits */
977         seqlock_t profiles_lock;
978         /*
979          * these three are in extended format (availability of single
980          * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
981          * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
982          */
983         u64 avail_data_alloc_bits;
984         u64 avail_metadata_alloc_bits;
985         u64 avail_system_alloc_bits;
986 
987         /* restriper state */
988         spinlock_t balance_lock;
989         struct mutex balance_mutex;
990         atomic_t balance_running;
991         atomic_t balance_pause_req;
992         atomic_t balance_cancel_req;
993         struct btrfs_balance_control *balance_ctl;
994         wait_queue_head_t balance_wait_q;
995 
996         unsigned data_chunk_allocations;
997         unsigned metadata_ratio;
998 
999         void *bdev_holder;
1000 
1001         /* private scrub information */
1002         struct mutex scrub_lock;
1003         atomic_t scrubs_running;
1004         atomic_t scrub_pause_req;
1005         atomic_t scrubs_paused;
1006         atomic_t scrub_cancel_req;
1007         wait_queue_head_t scrub_pause_wait;
1008         int scrub_workers_refcnt;
1009         struct btrfs_workqueue *scrub_workers;
1010         struct btrfs_workqueue *scrub_wr_completion_workers;
1011         struct btrfs_workqueue *scrub_nocow_workers;
1012         struct btrfs_workqueue *scrub_parity_workers;
1013 
1014 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1015         u32 check_integrity_print_mask;
1016 #endif
1017         /* is qgroup tracking in a consistent state? */
1018         u64 qgroup_flags;
1019 
1020         /* holds configuration and tracking. Protected by qgroup_lock */
1021         struct rb_root qgroup_tree;
1022         struct rb_root qgroup_op_tree;
1023         spinlock_t qgroup_lock;
1024         spinlock_t qgroup_op_lock;
1025         atomic_t qgroup_op_seq;
1026 
1027         /*
1028          * used to avoid frequently calling ulist_alloc()/ulist_free()
1029          * when doing qgroup accounting, it must be protected by qgroup_lock.
1030          */
1031         struct ulist *qgroup_ulist;
1032 
1033         /* protect user change for quota operations */
1034         struct mutex qgroup_ioctl_lock;
1035 
1036         /* list of dirty qgroups to be written at next commit */
1037         struct list_head dirty_qgroups;
1038 
1039         /* used by qgroup for an efficient tree traversal */
1040         u64 qgroup_seq;
1041 
1042         /* qgroup rescan items */
1043         struct mutex qgroup_rescan_lock; /* protects the progress item */
1044         struct btrfs_key qgroup_rescan_progress;
1045         struct btrfs_workqueue *qgroup_rescan_workers;
1046         struct completion qgroup_rescan_completion;
1047         struct btrfs_work qgroup_rescan_work;
1048         bool qgroup_rescan_running;     /* protected by qgroup_rescan_lock */
1049 
1050         /* filesystem state */
1051         unsigned long fs_state;
1052 
1053         struct btrfs_delayed_root *delayed_root;
1054 
1055         /* readahead tree */
1056         spinlock_t reada_lock;
1057         struct radix_tree_root reada_tree;
1058 
1059         /* readahead works cnt */
1060         atomic_t reada_works_cnt;
1061 
1062         /* Extent buffer radix tree */
1063         spinlock_t buffer_lock;
1064         struct radix_tree_root buffer_radix;
1065 
1066         /* next backup root to be overwritten */
1067         int backup_root_index;
1068 
1069         /* device replace state */
1070         struct btrfs_dev_replace dev_replace;
1071 
1072         struct percpu_counter bio_counter;
1073         wait_queue_head_t replace_wait;
1074 
1075         struct semaphore uuid_tree_rescan_sem;
1076 
1077         /* Used to reclaim the metadata space in the background. */
1078         struct work_struct async_reclaim_work;
1079 
1080         spinlock_t unused_bgs_lock;
1081         struct list_head unused_bgs;
1082         struct mutex unused_bg_unpin_mutex;
1083         struct mutex delete_unused_bgs_mutex;
1084 
1085         /* For btrfs to record security options */
1086         struct security_mnt_opts security_opts;
1087 
1088         /*
1089          * Chunks that can't be freed yet (under a trim/discard operation)
1090          * and will be latter freed. Protected by fs_info->chunk_mutex.
1091          */
1092         struct list_head pinned_chunks;
1093 
1094         /* Cached block sizes */
1095         u32 nodesize;
1096         u32 sectorsize;
1097         u32 stripesize;
1098 
1099 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1100         spinlock_t ref_verify_lock;
1101         struct rb_root block_tree;
1102 #endif
1103 };
1104 
1105 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1106 {
1107         return sb->s_fs_info;
1108 }
1109 
1110 struct btrfs_subvolume_writers {
1111         struct percpu_counter   counter;
1112         wait_queue_head_t       wait;
1113 };
1114 
1115 /*
1116  * The state of btrfs root
1117  */
1118 /*
1119  * btrfs_record_root_in_trans is a multi-step process,
1120  * and it can race with the balancing code.   But the
1121  * race is very small, and only the first time the root
1122  * is added to each transaction.  So IN_TRANS_SETUP
1123  * is used to tell us when more checks are required
1124  */
1125 #define BTRFS_ROOT_IN_TRANS_SETUP       0
1126 #define BTRFS_ROOT_REF_COWS             1
1127 #define BTRFS_ROOT_TRACK_DIRTY          2
1128 #define BTRFS_ROOT_IN_RADIX             3
1129 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 4
1130 #define BTRFS_ROOT_DEFRAG_RUNNING       5
1131 #define BTRFS_ROOT_FORCE_COW            6
1132 #define BTRFS_ROOT_MULTI_LOG_TASKS      7
1133 #define BTRFS_ROOT_DIRTY                8
1134 
1135 /*
1136  * in ram representation of the tree.  extent_root is used for all allocations
1137  * and for the extent tree extent_root root.
1138  */
1139 struct btrfs_root {
1140         struct extent_buffer *node;
1141 
1142         struct extent_buffer *commit_root;
1143         struct btrfs_root *log_root;
1144         struct btrfs_root *reloc_root;
1145 
1146         unsigned long state;
1147         struct btrfs_root_item root_item;
1148         struct btrfs_key root_key;
1149         struct btrfs_fs_info *fs_info;
1150         struct extent_io_tree dirty_log_pages;
1151 
1152         struct mutex objectid_mutex;
1153 
1154         spinlock_t accounting_lock;
1155         struct btrfs_block_rsv *block_rsv;
1156 
1157         /* free ino cache stuff */
1158         struct btrfs_free_space_ctl *free_ino_ctl;
1159         enum btrfs_caching_type ino_cache_state;
1160         spinlock_t ino_cache_lock;
1161         wait_queue_head_t ino_cache_wait;
1162         struct btrfs_free_space_ctl *free_ino_pinned;
1163         u64 ino_cache_progress;
1164         struct inode *ino_cache_inode;
1165 
1166         struct mutex log_mutex;
1167         wait_queue_head_t log_writer_wait;
1168         wait_queue_head_t log_commit_wait[2];
1169         struct list_head log_ctxs[2];
1170         atomic_t log_writers;
1171         atomic_t log_commit[2];
1172         atomic_t log_batch;
1173         int log_transid;
1174         /* No matter the commit succeeds or not*/
1175         int log_transid_committed;
1176         /* Just be updated when the commit succeeds. */
1177         int last_log_commit;
1178         pid_t log_start_pid;
1179 
1180         u64 objectid;
1181         u64 last_trans;
1182 
1183         u32 type;
1184 
1185         u64 highest_objectid;
1186 
1187 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1188         /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1189         u64 alloc_bytenr;
1190 #endif
1191 
1192         u64 defrag_trans_start;
1193         struct btrfs_key defrag_progress;
1194         struct btrfs_key defrag_max;
1195         char *name;
1196 
1197         /* the dirty list is only used by non-reference counted roots */
1198         struct list_head dirty_list;
1199 
1200         struct list_head root_list;
1201 
1202         spinlock_t log_extents_lock[2];
1203         struct list_head logged_list[2];
1204 
1205         spinlock_t orphan_lock;
1206         atomic_t orphan_inodes;
1207         struct btrfs_block_rsv *orphan_block_rsv;
1208         int orphan_cleanup_state;
1209 
1210         spinlock_t inode_lock;
1211         /* red-black tree that keeps track of in-memory inodes */
1212         struct rb_root inode_tree;
1213 
1214         /*
1215          * radix tree that keeps track of delayed nodes of every inode,
1216          * protected by inode_lock
1217          */
1218         struct radix_tree_root delayed_nodes_tree;
1219         /*
1220          * right now this just gets used so that a root has its own devid
1221          * for stat.  It may be used for more later
1222          */
1223         dev_t anon_dev;
1224 
1225         spinlock_t root_item_lock;
1226         refcount_t refs;
1227 
1228         struct mutex delalloc_mutex;
1229         spinlock_t delalloc_lock;
1230         /*
1231          * all of the inodes that have delalloc bytes.  It is possible for
1232          * this list to be empty even when there is still dirty data=ordered
1233          * extents waiting to finish IO.
1234          */
1235         struct list_head delalloc_inodes;
1236         struct list_head delalloc_root;
1237         u64 nr_delalloc_inodes;
1238 
1239         struct mutex ordered_extent_mutex;
1240         /*
1241          * this is used by the balancing code to wait for all the pending
1242          * ordered extents
1243          */
1244         spinlock_t ordered_extent_lock;
1245 
1246         /*
1247          * all of the data=ordered extents pending writeback
1248          * these can span multiple transactions and basically include
1249          * every dirty data page that isn't from nodatacow
1250          */
1251         struct list_head ordered_extents;
1252         struct list_head ordered_root;
1253         u64 nr_ordered_extents;
1254 
1255         /*
1256          * Number of currently running SEND ioctls to prevent
1257          * manipulation with the read-only status via SUBVOL_SETFLAGS
1258          */
1259         int send_in_progress;
1260         struct btrfs_subvolume_writers *subv_writers;
1261         atomic_t will_be_snapshotted;
1262 
1263         /* For qgroup metadata space reserve */
1264         atomic64_t qgroup_meta_rsv;
1265 };
1266 
1267 struct btrfs_file_private {
1268         struct btrfs_trans_handle *trans;
1269         void *filldir_buf;
1270 };
1271 
1272 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1273 {
1274         return btrfs_sb(inode->i_sb)->sectorsize;
1275 }
1276 
1277 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1278 {
1279 
1280         return info->nodesize - sizeof(struct btrfs_header);
1281 }
1282 
1283 #define BTRFS_LEAF_DATA_OFFSET          offsetof(struct btrfs_leaf, items)
1284 
1285 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1286 {
1287         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1288 }
1289 
1290 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1291 {
1292         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1293 }
1294 
1295 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1296                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1297 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1298 {
1299         return BTRFS_MAX_ITEM_SIZE(info) -
1300                BTRFS_FILE_EXTENT_INLINE_DATA_START;
1301 }
1302 
1303 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1304 {
1305         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1306 }
1307 
1308 /*
1309  * Flags for mount options.
1310  *
1311  * Note: don't forget to add new options to btrfs_show_options()
1312  */
1313 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
1314 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
1315 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1316 #define BTRFS_MOUNT_SSD                 (1 << 3)
1317 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
1318 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
1319 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1320 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1321 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1322 #define BTRFS_MOUNT_NOSSD               (1 << 9)
1323 #define BTRFS_MOUNT_DISCARD             (1 << 10)
1324 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1325 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1326 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1327 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1328 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1329 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1330 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1331 #define BTRFS_MOUNT_USEBACKUPROOT       (1 << 18)
1332 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1333 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1334 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1335 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1336 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
1337 #define BTRFS_MOUNT_FRAGMENT_DATA       (1 << 24)
1338 #define BTRFS_MOUNT_FRAGMENT_METADATA   (1 << 25)
1339 #define BTRFS_MOUNT_FREE_SPACE_TREE     (1 << 26)
1340 #define BTRFS_MOUNT_NOLOGREPLAY         (1 << 27)
1341 #define BTRFS_MOUNT_REF_VERIFY          (1 << 28)
1342 
1343 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
1344 #define BTRFS_DEFAULT_MAX_INLINE        (2048)
1345 
1346 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1347 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1348 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
1349 #define btrfs_test_opt(fs_info, opt)    ((fs_info)->mount_opt & \
1350                                          BTRFS_MOUNT_##opt)
1351 
1352 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                  \
1353 {                                                                       \
1354         if (!btrfs_test_opt(fs_info, opt))                              \
1355                 btrfs_info(fs_info, fmt, ##args);                       \
1356         btrfs_set_opt(fs_info->mount_opt, opt);                         \
1357 }
1358 
1359 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)                \
1360 {                                                                       \
1361         if (btrfs_test_opt(fs_info, opt))                               \
1362                 btrfs_info(fs_info, fmt, ##args);                       \
1363         btrfs_clear_opt(fs_info->mount_opt, opt);                       \
1364 }
1365 
1366 #ifdef CONFIG_BTRFS_DEBUG
1367 static inline int
1368 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1369 {
1370         struct btrfs_fs_info *fs_info = block_group->fs_info;
1371 
1372         return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1373                 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1374                (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1375                 block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1376 }
1377 #endif
1378 
1379 /*
1380  * Requests for changes that need to be done during transaction commit.
1381  *
1382  * Internal mount options that are used for special handling of the real
1383  * mount options (eg. cannot be set during remount and have to be set during
1384  * transaction commit)
1385  */
1386 
1387 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
1388 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
1389 #define BTRFS_PENDING_COMMIT                    (2)
1390 
1391 #define btrfs_test_pending(info, opt)   \
1392         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1393 #define btrfs_set_pending(info, opt)    \
1394         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1395 #define btrfs_clear_pending(info, opt)  \
1396         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1397 
1398 /*
1399  * Helpers for setting pending mount option changes.
1400  *
1401  * Expects corresponding macros
1402  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1403  */
1404 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1405 do {                                                                   \
1406        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1407                btrfs_info((info), fmt, ##args);                        \
1408                btrfs_set_pending((info), SET_##opt);                   \
1409                btrfs_clear_pending((info), CLEAR_##opt);               \
1410        }                                                               \
1411 } while(0)
1412 
1413 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1414 do {                                                                   \
1415        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1416                btrfs_info((info), fmt, ##args);                        \
1417                btrfs_set_pending((info), CLEAR_##opt);                 \
1418                btrfs_clear_pending((info), SET_##opt);                 \
1419        }                                                               \
1420 } while(0)
1421 
1422 /*
1423  * Inode flags
1424  */
1425 #define BTRFS_INODE_NODATASUM           (1 << 0)
1426 #define BTRFS_INODE_NODATACOW           (1 << 1)
1427 #define BTRFS_INODE_READONLY            (1 << 2)
1428 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1429 #define BTRFS_INODE_PREALLOC            (1 << 4)
1430 #define BTRFS_INODE_SYNC                (1 << 5)
1431 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1432 #define BTRFS_INODE_APPEND              (1 << 7)
1433 #define BTRFS_INODE_NODUMP              (1 << 8)
1434 #define BTRFS_INODE_NOATIME             (1 << 9)
1435 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1436 #define BTRFS_INODE_COMPRESS            (1 << 11)
1437 
1438 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1439 
1440 struct btrfs_map_token {
1441         const struct extent_buffer *eb;
1442         char *kaddr;
1443         unsigned long offset;
1444 };
1445 
1446 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1447                                 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1448 
1449 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1450 {
1451         token->kaddr = NULL;
1452 }
1453 
1454 /* some macros to generate set/get functions for the struct fields.  This
1455  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1456  * one for u8:
1457  */
1458 #define le8_to_cpu(v) (v)
1459 #define cpu_to_le8(v) (v)
1460 #define __le8 u8
1461 
1462 #define read_eb_member(eb, ptr, type, member, result) (\
1463         read_extent_buffer(eb, (char *)(result),                        \
1464                            ((unsigned long)(ptr)) +                     \
1465                             offsetof(type, member),                     \
1466                            sizeof(((type *)0)->member)))
1467 
1468 #define write_eb_member(eb, ptr, type, member, result) (\
1469         write_extent_buffer(eb, (char *)(result),                       \
1470                            ((unsigned long)(ptr)) +                     \
1471                             offsetof(type, member),                     \
1472                            sizeof(((type *)0)->member)))
1473 
1474 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1475 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,          \
1476                                const void *ptr, unsigned long off,      \
1477                                struct btrfs_map_token *token);          \
1478 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,  \
1479                             unsigned long off, u##bits val,             \
1480                             struct btrfs_map_token *token);             \
1481 static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,  \
1482                                        const void *ptr,                 \
1483                                        unsigned long off)               \
1484 {                                                                       \
1485         return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
1486 }                                                                       \
1487 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
1488                                     unsigned long off, u##bits val)     \
1489 {                                                                       \
1490        btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
1491 }
1492 
1493 DECLARE_BTRFS_SETGET_BITS(8)
1494 DECLARE_BTRFS_SETGET_BITS(16)
1495 DECLARE_BTRFS_SETGET_BITS(32)
1496 DECLARE_BTRFS_SETGET_BITS(64)
1497 
1498 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1499 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1500                                    const type *s)                       \
1501 {                                                                       \
1502         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1503         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1504 }                                                                       \
1505 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1506                                     u##bits val)                        \
1507 {                                                                       \
1508         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1509         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1510 }                                                                       \
1511 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1512                                          const type *s,                 \
1513                                          struct btrfs_map_token *token) \
1514 {                                                                       \
1515         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1516         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1517 }                                                                       \
1518 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1519                                           type *s, u##bits val,         \
1520                                          struct btrfs_map_token *token) \
1521 {                                                                       \
1522         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1523         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1524 }
1525 
1526 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1527 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1528 {                                                                       \
1529         const type *p = page_address(eb->pages[0]);                     \
1530         u##bits res = le##bits##_to_cpu(p->member);                     \
1531         return res;                                                     \
1532 }                                                                       \
1533 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1534                                     u##bits val)                        \
1535 {                                                                       \
1536         type *p = page_address(eb->pages[0]);                           \
1537         p->member = cpu_to_le##bits(val);                               \
1538 }
1539 
1540 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1541 static inline u##bits btrfs_##name(const type *s)                       \
1542 {                                                                       \
1543         return le##bits##_to_cpu(s->member);                            \
1544 }                                                                       \
1545 static inline void btrfs_set_##name(type *s, u##bits val)               \
1546 {                                                                       \
1547         s->member = cpu_to_le##bits(val);                               \
1548 }
1549 
1550 
1551 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1552                                            struct btrfs_dev_item *s)
1553 {
1554         BUILD_BUG_ON(sizeof(u64) !=
1555                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1556         return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1557                                             total_bytes));
1558 }
1559 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1560                                                 struct btrfs_dev_item *s,
1561                                                 u64 val)
1562 {
1563         BUILD_BUG_ON(sizeof(u64) !=
1564                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1565         WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1566         btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1567 }
1568 
1569 
1570 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1571 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1572 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1573 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1574 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1575                    start_offset, 64);
1576 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1577 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1578 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1579 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1580 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1581 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1582 
1583 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1584 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1585                          total_bytes, 64);
1586 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1587                          bytes_used, 64);
1588 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1589                          io_align, 32);
1590 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1591                          io_width, 32);
1592 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1593                          sector_size, 32);
1594 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1595 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1596                          dev_group, 32);
1597 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1598                          seek_speed, 8);
1599 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1600                          bandwidth, 8);
1601 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1602                          generation, 64);
1603 
1604 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1605 {
1606         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1607 }
1608 
1609 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1610 {
1611         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1612 }
1613 
1614 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1615 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1616 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1617 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1618 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1619 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1620 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1621 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1622 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1623 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1624 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1625 
1626 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1627 {
1628         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1629 }
1630 
1631 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1632 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1633 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1634                          stripe_len, 64);
1635 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1636                          io_align, 32);
1637 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1638                          io_width, 32);
1639 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1640                          sector_size, 32);
1641 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1642 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1643                          num_stripes, 16);
1644 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1645                          sub_stripes, 16);
1646 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1647 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1648 
1649 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1650                                                    int nr)
1651 {
1652         unsigned long offset = (unsigned long)c;
1653         offset += offsetof(struct btrfs_chunk, stripe);
1654         offset += nr * sizeof(struct btrfs_stripe);
1655         return (struct btrfs_stripe *)offset;
1656 }
1657 
1658 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1659 {
1660         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1661 }
1662 
1663 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1664                                          struct btrfs_chunk *c, int nr)
1665 {
1666         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1667 }
1668 
1669 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1670                                          struct btrfs_chunk *c, int nr)
1671 {
1672         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1673 }
1674 
1675 /* struct btrfs_block_group_item */
1676 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1677                          used, 64);
1678 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1679                          used, 64);
1680 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1681                         struct btrfs_block_group_item, chunk_objectid, 64);
1682 
1683 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1684                    struct btrfs_block_group_item, chunk_objectid, 64);
1685 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1686                    struct btrfs_block_group_item, flags, 64);
1687 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1688                         struct btrfs_block_group_item, flags, 64);
1689 
1690 /* struct btrfs_free_space_info */
1691 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1692                    extent_count, 32);
1693 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1694 
1695 /* struct btrfs_inode_ref */
1696 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1697 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1698 
1699 /* struct btrfs_inode_extref */
1700 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1701                    parent_objectid, 64);
1702 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1703                    name_len, 16);
1704 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1705 
1706 /* struct btrfs_inode_item */
1707 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1708 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1709 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1710 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1711 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1712 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1713 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1714 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1715 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1716 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1717 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1718 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1719 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1720                          generation, 64);
1721 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1722                          sequence, 64);
1723 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1724                          transid, 64);
1725 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1726 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1727                          nbytes, 64);
1728 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1729                          block_group, 64);
1730 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1731 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1732 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1733 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1734 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1735 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1736 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1737 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1738 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1739 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1740 
1741 /* struct btrfs_dev_extent */
1742 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1743                    chunk_tree, 64);
1744 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1745                    chunk_objectid, 64);
1746 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1747                    chunk_offset, 64);
1748 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1749 
1750 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1751 {
1752         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1753         return (unsigned long)dev + ptr;
1754 }
1755 
1756 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1757 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1758                    generation, 64);
1759 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1760 
1761 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1762 
1763 
1764 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1765 
1766 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1767                                         struct btrfs_tree_block_info *item,
1768                                         struct btrfs_disk_key *key)
1769 {
1770         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1771 }
1772 
1773 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1774                                             struct btrfs_tree_block_info *item,
1775                                             struct btrfs_disk_key *key)
1776 {
1777         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1778 }
1779 
1780 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1781                    root, 64);
1782 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1783                    objectid, 64);
1784 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1785                    offset, 64);
1786 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1787                    count, 32);
1788 
1789 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1790                    count, 32);
1791 
1792 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1793                    type, 8);
1794 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1795                    offset, 64);
1796 
1797 static inline u32 btrfs_extent_inline_ref_size(int type)
1798 {
1799         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1800             type == BTRFS_SHARED_BLOCK_REF_KEY)
1801                 return sizeof(struct btrfs_extent_inline_ref);
1802         if (type == BTRFS_SHARED_DATA_REF_KEY)
1803                 return sizeof(struct btrfs_shared_data_ref) +
1804                        sizeof(struct btrfs_extent_inline_ref);
1805         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1806                 return sizeof(struct btrfs_extent_data_ref) +
1807                        offsetof(struct btrfs_extent_inline_ref, offset);
1808         return 0;
1809 }
1810 
1811 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1812 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1813                    generation, 64);
1814 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1815 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1816 
1817 /* struct btrfs_node */
1818 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1819 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1820 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1821                          blockptr, 64);
1822 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1823                          generation, 64);
1824 
1825 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1826 {
1827         unsigned long ptr;
1828         ptr = offsetof(struct btrfs_node, ptrs) +
1829                 sizeof(struct btrfs_key_ptr) * nr;
1830         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1831 }
1832 
1833 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1834                                            int nr, u64 val)
1835 {
1836         unsigned long ptr;
1837         ptr = offsetof(struct btrfs_node, ptrs) +
1838                 sizeof(struct btrfs_key_ptr) * nr;
1839         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1840 }
1841 
1842 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1843 {
1844         unsigned long ptr;
1845         ptr = offsetof(struct btrfs_node, ptrs) +
1846                 sizeof(struct btrfs_key_ptr) * nr;
1847         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1848 }
1849 
1850 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1851                                                  int nr, u64 val)
1852 {
1853         unsigned long ptr;
1854         ptr = offsetof(struct btrfs_node, ptrs) +
1855                 sizeof(struct btrfs_key_ptr) * nr;
1856         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1857 }
1858 
1859 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1860 {
1861         return offsetof(struct btrfs_node, ptrs) +
1862                 sizeof(struct btrfs_key_ptr) * nr;
1863 }
1864 
1865 void btrfs_node_key(const struct extent_buffer *eb,
1866                     struct btrfs_disk_key *disk_key, int nr);
1867 
1868 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1869                                       struct btrfs_disk_key *disk_key, int nr)
1870 {
1871         unsigned long ptr;
1872         ptr = btrfs_node_key_ptr_offset(nr);
1873         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1874                        struct btrfs_key_ptr, key, disk_key);
1875 }
1876 
1877 /* struct btrfs_item */
1878 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1879 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1880 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1881 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1882 
1883 static inline unsigned long btrfs_item_nr_offset(int nr)
1884 {
1885         return offsetof(struct btrfs_leaf, items) +
1886                 sizeof(struct btrfs_item) * nr;
1887 }
1888 
1889 static inline struct btrfs_item *btrfs_item_nr(int nr)
1890 {
1891         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1892 }
1893 
1894 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1895                                  struct btrfs_item *item)
1896 {
1897         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1898 }
1899 
1900 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1901 {
1902         return btrfs_item_end(eb, btrfs_item_nr(nr));
1903 }
1904 
1905 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1906 {
1907         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1908 }
1909 
1910 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1911 {
1912         return btrfs_item_size(eb, btrfs_item_nr(nr));
1913 }
1914 
1915 static inline void btrfs_item_key(const struct extent_buffer *eb,
1916                            struct btrfs_disk_key *disk_key, int nr)
1917 {
1918         struct btrfs_item *item = btrfs_item_nr(nr);
1919         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1920 }
1921 
1922 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1923                                struct btrfs_disk_key *disk_key, int nr)
1924 {
1925         struct btrfs_item *item = btrfs_item_nr(nr);
1926         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1927 }
1928 
1929 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1930 
1931 /*
1932  * struct btrfs_root_ref
1933  */
1934 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1935 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1936 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1937 
1938 /* struct btrfs_dir_item */
1939 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1940 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1941 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1942 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1943 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1944 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1945                          data_len, 16);
1946 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1947                          name_len, 16);
1948 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1949                          transid, 64);
1950 
1951 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
1952                                       const struct btrfs_dir_item *item,
1953                                       struct btrfs_disk_key *key)
1954 {
1955         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1956 }
1957 
1958 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1959                                           struct btrfs_dir_item *item,
1960                                           const struct btrfs_disk_key *key)
1961 {
1962         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1963 }
1964 
1965 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1966                    num_entries, 64);
1967 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1968                    num_bitmaps, 64);
1969 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1970                    generation, 64);
1971 
1972 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
1973                                         const struct btrfs_free_space_header *h,
1974                                         struct btrfs_disk_key *key)
1975 {
1976         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1977 }
1978 
1979 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1980                                             struct btrfs_free_space_header *h,
1981                                             const struct btrfs_disk_key *key)
1982 {
1983         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1984 }
1985 
1986 /* struct btrfs_disk_key */
1987 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1988                          objectid, 64);
1989 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1990 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1991 
1992 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1993                                          const struct btrfs_disk_key *disk)
1994 {
1995         cpu->offset = le64_to_cpu(disk->offset);
1996         cpu->type = disk->type;
1997         cpu->objectid = le64_to_cpu(disk->objectid);
1998 }
1999 
2000 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2001                                          const struct btrfs_key *cpu)
2002 {
2003         disk->offset = cpu_to_le64(cpu->offset);
2004         disk->type = cpu->type;
2005         disk->objectid = cpu_to_le64(cpu->objectid);
2006 }
2007 
2008 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2009                                          struct btrfs_key *key, int nr)
2010 {
2011         struct btrfs_disk_key disk_key;
2012         btrfs_node_key(eb, &disk_key, nr);
2013         btrfs_disk_key_to_cpu(key, &disk_key);
2014 }
2015 
2016 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2017                                          struct btrfs_key *key, int nr)
2018 {
2019         struct btrfs_disk_key disk_key;
2020         btrfs_item_key(eb, &disk_key, nr);
2021         btrfs_disk_key_to_cpu(key, &disk_key);
2022 }
2023 
2024 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2025                                              const struct btrfs_dir_item *item,
2026                                              struct btrfs_key *key)
2027 {
2028         struct btrfs_disk_key disk_key;
2029         btrfs_dir_item_key(eb, item, &disk_key);
2030         btrfs_disk_key_to_cpu(key, &disk_key);
2031 }
2032 
2033 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2034 {
2035         return key->type;
2036 }
2037 
2038 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2039 {
2040         key->type = val;
2041 }
2042 
2043 /* struct btrfs_header */
2044 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2045 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2046                           generation, 64);
2047 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2048 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2049 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2050 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2051 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2052                          generation, 64);
2053 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2054 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2055                          nritems, 32);
2056 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2057 
2058 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2059 {
2060         return (btrfs_header_flags(eb) & flag) == flag;
2061 }
2062 
2063 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2064 {
2065         u64 flags = btrfs_header_flags(eb);
2066         btrfs_set_header_flags(eb, flags | flag);
2067         return (flags & flag) == flag;
2068 }
2069 
2070 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2071 {
2072         u64 flags = btrfs_header_flags(eb);
2073         btrfs_set_header_flags(eb, flags & ~flag);
2074         return (flags & flag) == flag;
2075 }
2076 
2077 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2078 {
2079         u64 flags = btrfs_header_flags(eb);
2080         return flags >> BTRFS_BACKREF_REV_SHIFT;
2081 }
2082 
2083 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2084                                                 int rev)
2085 {
2086         u64 flags = btrfs_header_flags(eb);
2087         flags &= ~BTRFS_BACKREF_REV_MASK;
2088         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2089         btrfs_set_header_flags(eb, flags);
2090 }
2091 
2092 static inline unsigned long btrfs_header_fsid(void)
2093 {
2094         return offsetof(struct btrfs_header, fsid);
2095 }
2096 
2097 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
2098 {
2099         return offsetof(struct btrfs_header, chunk_tree_uuid);
2100 }
2101 
2102 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2103 {
2104         return btrfs_header_level(eb) == 0;
2105 }
2106 
2107 /* struct btrfs_root_item */
2108 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2109                    generation, 64);
2110 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2111 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2112 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2113 
2114 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2115                          generation, 64);
2116 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2117 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2118 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2119 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2120 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2121 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2122 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2123 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2124                          last_snapshot, 64);
2125 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2126                          generation_v2, 64);
2127 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2128                          ctransid, 64);
2129 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2130                          otransid, 64);
2131 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2132                          stransid, 64);
2133 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2134                          rtransid, 64);
2135 
2136 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2137 {
2138         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2139 }
2140 
2141 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2142 {
2143         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2144 }
2145 
2146 /* struct btrfs_root_backup */
2147 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2148                    tree_root, 64);
2149 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2150                    tree_root_gen, 64);
2151 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2152                    tree_root_level, 8);
2153 
2154 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2155                    chunk_root, 64);
2156 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2157                    chunk_root_gen, 64);
2158 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2159                    chunk_root_level, 8);
2160 
2161 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2162                    extent_root, 64);
2163 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2164                    extent_root_gen, 64);
2165 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2166                    extent_root_level, 8);
2167 
2168 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2169                    fs_root, 64);
2170 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2171                    fs_root_gen, 64);
2172 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2173                    fs_root_level, 8);
2174 
2175 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2176                    dev_root, 64);
2177 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2178                    dev_root_gen, 64);
2179 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2180                    dev_root_level, 8);
2181 
2182 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2183                    csum_root, 64);
2184 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2185                    csum_root_gen, 64);
2186 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2187                    csum_root_level, 8);
2188 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2189                    total_bytes, 64);
2190 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2191                    bytes_used, 64);
2192 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2193                    num_devices, 64);
2194 
2195 /* struct btrfs_balance_item */
2196 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2197 
2198 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2199                                       const struct btrfs_balance_item *bi,
2200                                       struct btrfs_disk_balance_args *ba)
2201 {
2202         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2203 }
2204 
2205 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2206                                   struct btrfs_balance_item *bi,
2207                                   const struct btrfs_disk_balance_args *ba)
2208 {
2209         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2210 }
2211 
2212 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2213                                       const struct btrfs_balance_item *bi,
2214                                       struct btrfs_disk_balance_args *ba)
2215 {
2216         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2217 }
2218 
2219 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2220                                   struct btrfs_balance_item *bi,
2221                                   const struct btrfs_disk_balance_args *ba)
2222 {
2223         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2224 }
2225 
2226 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2227                                      const struct btrfs_balance_item *bi,
2228                                      struct btrfs_disk_balance_args *ba)
2229 {
2230         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2231 }
2232 
2233 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2234                                  struct btrfs_balance_item *bi,
2235                                  const struct btrfs_disk_balance_args *ba)
2236 {
2237         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2238 }
2239 
2240 static inline void
2241 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2242                                const struct btrfs_disk_balance_args *disk)
2243 {
2244         memset(cpu, 0, sizeof(*cpu));
2245 
2246         cpu->profiles = le64_to_cpu(disk->profiles);
2247         cpu->usage = le64_to_cpu(disk->usage);
2248         cpu->devid = le64_to_cpu(disk->devid);
2249         cpu->pstart = le64_to_cpu(disk->pstart);
2250         cpu->pend = le64_to_cpu(disk->pend);
2251         cpu->vstart = le64_to_cpu(disk->vstart);
2252         cpu->vend = le64_to_cpu(disk->vend);
2253         cpu->target = le64_to_cpu(disk->target);
2254         cpu->flags = le64_to_cpu(disk->flags);
2255         cpu->limit = le64_to_cpu(disk->limit);
2256         cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2257         cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2258 }
2259 
2260 static inline void
2261 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2262                                const struct btrfs_balance_args *cpu)
2263 {
2264         memset(disk, 0, sizeof(*disk));
2265 
2266         disk->profiles = cpu_to_le64(cpu->profiles);
2267         disk->usage = cpu_to_le64(cpu->usage);
2268         disk->devid = cpu_to_le64(cpu->devid);
2269         disk->pstart = cpu_to_le64(cpu->pstart);
2270         disk->pend = cpu_to_le64(cpu->pend);
2271         disk->vstart = cpu_to_le64(cpu->vstart);
2272         disk->vend = cpu_to_le64(cpu->vend);
2273         disk->target = cpu_to_le64(cpu->target);
2274         disk->flags = cpu_to_le64(cpu->flags);
2275         disk->limit = cpu_to_le64(cpu->limit);
2276         disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2277         disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2278 }
2279 
2280 /* struct btrfs_super_block */
2281 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2282 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2283 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2284                          generation, 64);
2285 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2286 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2287                          struct btrfs_super_block, sys_chunk_array_size, 32);
2288 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2289                          struct btrfs_super_block, chunk_root_generation, 64);
2290 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2291                          root_level, 8);
2292 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2293                          chunk_root, 64);
2294 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2295                          chunk_root_level, 8);
2296 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2297                          log_root, 64);
2298 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2299                          log_root_transid, 64);
2300 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2301                          log_root_level, 8);
2302 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2303                          total_bytes, 64);
2304 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2305                          bytes_used, 64);
2306 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2307                          sectorsize, 32);
2308 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2309                          nodesize, 32);
2310 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2311                          stripesize, 32);
2312 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2313                          root_dir_objectid, 64);
2314 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2315                          num_devices, 64);
2316 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2317                          compat_flags, 64);
2318 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2319                          compat_ro_flags, 64);
2320 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2321                          incompat_flags, 64);
2322 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2323                          csum_type, 16);
2324 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2325                          cache_generation, 64);
2326 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2327 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2328                          uuid_tree_generation, 64);
2329 
2330 static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
2331 {
2332         u16 t = btrfs_super_csum_type(s);
2333         /*
2334          * csum type is validated at mount time
2335          */
2336         return btrfs_csum_sizes[t];
2337 }
2338 
2339 
2340 /*
2341  * The leaf data grows from end-to-front in the node.
2342  * this returns the address of the start of the last item,
2343  * which is the stop of the leaf data stack
2344  */
2345 static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
2346                                          const struct extent_buffer *leaf)
2347 {
2348         u32 nr = btrfs_header_nritems(leaf);
2349 
2350         if (nr == 0)
2351                 return BTRFS_LEAF_DATA_SIZE(fs_info);
2352         return btrfs_item_offset_nr(leaf, nr - 1);
2353 }
2354 
2355 /* struct btrfs_file_extent_item */
2356 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2357 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2358                          struct btrfs_file_extent_item, disk_bytenr, 64);
2359 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2360                          struct btrfs_file_extent_item, offset, 64);
2361 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2362                          struct btrfs_file_extent_item, generation, 64);
2363 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2364                          struct btrfs_file_extent_item, num_bytes, 64);
2365 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2366                          struct btrfs_file_extent_item, disk_num_bytes, 64);
2367 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2368                          struct btrfs_file_extent_item, compression, 8);
2369 
2370 static inline unsigned long
2371 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2372 {
2373         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2374 }
2375 
2376 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2377 {
2378         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2379 }
2380 
2381 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2382                    disk_bytenr, 64);
2383 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2384                    generation, 64);
2385 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2386                    disk_num_bytes, 64);
2387 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2388                   offset, 64);
2389 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2390                    num_bytes, 64);
2391 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2392                    ram_bytes, 64);
2393 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2394                    compression, 8);
2395 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2396                    encryption, 8);
2397 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2398                    other_encoding, 16);
2399 
2400 /*
2401  * this returns the number of bytes used by the item on disk, minus the
2402  * size of any extent headers.  If a file is compressed on disk, this is
2403  * the compressed size
2404  */
2405 static inline u32 btrfs_file_extent_inline_item_len(
2406                                                 const struct extent_buffer *eb,
2407                                                 struct btrfs_item *e)
2408 {
2409         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2410 }
2411 
2412 /* this returns the number of file bytes represented by the inline item.
2413  * If an item is compressed, this is the uncompressed size
2414  */
2415 static inline u32 btrfs_file_extent_inline_len(const struct extent_buffer *eb,
2416                                         int slot,
2417                                         const struct btrfs_file_extent_item *fi)
2418 {
2419         struct btrfs_map_token token;
2420 
2421         btrfs_init_map_token(&token);
2422         /*
2423          * return the space used on disk if this item isn't
2424          * compressed or encoded
2425          */
2426         if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
2427             btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
2428             btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
2429                 return btrfs_file_extent_inline_item_len(eb,
2430                                                          btrfs_item_nr(slot));
2431         }
2432 
2433         /* otherwise use the ram bytes field */
2434         return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
2435 }
2436 
2437 
2438 /* btrfs_dev_stats_item */
2439 static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
2440                                         const struct btrfs_dev_stats_item *ptr,
2441                                         int index)
2442 {
2443         u64 val;
2444 
2445         read_extent_buffer(eb, &val,
2446                            offsetof(struct btrfs_dev_stats_item, values) +
2447                             ((unsigned long)ptr) + (index * sizeof(u64)),
2448                            sizeof(val));
2449         return val;
2450 }
2451 
2452 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2453                                              struct btrfs_dev_stats_item *ptr,
2454                                              int index, u64 val)
2455 {
2456         write_extent_buffer(eb, &val,
2457                             offsetof(struct btrfs_dev_stats_item, values) +
2458                              ((unsigned long)ptr) + (index * sizeof(u64)),
2459                             sizeof(val));
2460 }
2461 
2462 /* btrfs_qgroup_status_item */
2463 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2464                    generation, 64);
2465 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2466                    version, 64);
2467 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2468                    flags, 64);
2469 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2470                    rescan, 64);
2471 
2472 /* btrfs_qgroup_info_item */
2473 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2474                    generation, 64);
2475 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2476 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2477                    rfer_cmpr, 64);
2478 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2479 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2480                    excl_cmpr, 64);
2481 
2482 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2483                          struct btrfs_qgroup_info_item, generation, 64);
2484 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2485                          rfer, 64);
2486 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2487                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2488 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2489                          excl, 64);
2490 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2491                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
2492 
2493 /* btrfs_qgroup_limit_item */
2494 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2495                    flags, 64);
2496 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2497                    max_rfer, 64);
2498 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2499                    max_excl, 64);
2500 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2501                    rsv_rfer, 64);
2502 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2503                    rsv_excl, 64);
2504 
2505 /* btrfs_dev_replace_item */
2506 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2507                    struct btrfs_dev_replace_item, src_devid, 64);
2508 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2509                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2510                    64);
2511 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2512                    replace_state, 64);
2513 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2514                    time_started, 64);
2515 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2516                    time_stopped, 64);
2517 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2518                    num_write_errors, 64);
2519 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2520                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2521                    64);
2522 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2523                    cursor_left, 64);
2524 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2525                    cursor_right, 64);
2526 
2527 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2528                          struct btrfs_dev_replace_item, src_devid, 64);
2529 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2530                          struct btrfs_dev_replace_item,
2531                          cont_reading_from_srcdev_mode, 64);
2532 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2533                          struct btrfs_dev_replace_item, replace_state, 64);
2534 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2535                          struct btrfs_dev_replace_item, time_started, 64);
2536 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2537                          struct btrfs_dev_replace_item, time_stopped, 64);
2538 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2539                          struct btrfs_dev_replace_item, num_write_errors, 64);
2540 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2541                          struct btrfs_dev_replace_item,
2542                          num_uncorrectable_read_errors, 64);
2543 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2544                          struct btrfs_dev_replace_item, cursor_left, 64);
2545 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2546                          struct btrfs_dev_replace_item, cursor_right, 64);
2547 
2548 /* helper function to cast into the data area of the leaf. */
2549 #define btrfs_item_ptr(leaf, slot, type) \
2550         ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2551         btrfs_item_offset_nr(leaf, slot)))
2552 
2553 #define btrfs_item_ptr_offset(leaf, slot) \
2554         ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2555         btrfs_item_offset_nr(leaf, slot)))
2556 
2557 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2558 {
2559         return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2560                 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2561 }
2562 
2563 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2564 {
2565         return mapping_gfp_constraint(mapping, ~__GFP_FS);
2566 }
2567 
2568 /* extent-tree.c */
2569 
2570 enum btrfs_inline_ref_type {
2571         BTRFS_REF_TYPE_INVALID =         0,
2572         BTRFS_REF_TYPE_BLOCK =           1,
2573         BTRFS_REF_TYPE_DATA =            2,
2574         BTRFS_REF_TYPE_ANY =             3,
2575 };
2576 
2577 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2578                                      struct btrfs_extent_inline_ref *iref,
2579                                      enum btrfs_inline_ref_type is_data);
2580 
2581 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2582 
2583 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2584                                                  unsigned num_items)
2585 {
2586         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2587 }
2588 
2589 /*
2590  * Doing a truncate won't result in new nodes or leaves, just what we need for
2591  * COW.
2592  */
2593 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2594                                                  unsigned num_items)
2595 {
2596         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2597 }
2598 
2599 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
2600                                        struct btrfs_fs_info *fs_info);
2601 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
2602                                        struct btrfs_fs_info *fs_info);
2603 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2604                                          const u64 start);
2605 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2606 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2607 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2608 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2609 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2610 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2611                            struct btrfs_fs_info *fs_info, unsigned long count);
2612 int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2613                                  unsigned long count, u64 transid, int wait);
2614 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2615 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2616                              struct btrfs_fs_info *fs_info, u64 bytenr,
2617                              u64 offset, int metadata, u64 *refs, u64 *flags);
2618 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2619                      u64 bytenr, u64 num, int reserved);
2620 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2621                                     u64 bytenr, u64 num_bytes);
2622 int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2623                                  struct extent_buffer *eb);
2624 int btrfs_cross_ref_exist(struct btrfs_root *root,
2625                           u64 objectid, u64 offset, u64 bytenr);
2626 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2627                                                  struct btrfs_fs_info *info,
2628                                                  u64 bytenr);
2629 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2630 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2631 int get_block_group_index(struct btrfs_block_group_cache *cache);
2632 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2633                                              struct btrfs_root *root,
2634                                              u64 parent, u64 root_objectid,
2635                                              const struct btrfs_disk_key *key,
2636                                              int level, u64 hint,
2637                                              u64 empty_size);
2638 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2639                            struct btrfs_root *root,
2640                            struct extent_buffer *buf,
2641                            u64 parent, int last_ref);
2642 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2643                                      struct btrfs_root *root, u64 owner,
2644                                      u64 offset, u64 ram_bytes,
2645                                      struct btrfs_key *ins);
2646 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2647                                    struct btrfs_fs_info *fs_info,
2648                                    u64 root_objectid, u64 owner, u64 offset,
2649                                    struct btrfs_key *ins);
2650 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2651                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2652                          struct btrfs_key *ins, int is_data, int delalloc);
2653 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2654                   struct extent_buffer *buf, int full_backref);
2655 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2656                   struct extent_buffer *buf, int full_backref);
2657 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2658                                 struct btrfs_fs_info *fs_info,
2659                                 u64 bytenr, u64 num_bytes, u64 flags,
2660                                 int level, int is_data);
2661 int btrfs_free_extent(struct btrfs_trans_handle *trans,
2662                       struct btrfs_root *root,
2663                       u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2664                       u64 owner, u64 offset);
2665 
2666 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2667                                u64 start, u64 len, int delalloc);
2668 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2669                                        u64 start, u64 len);
2670 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2671 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2672                                struct btrfs_fs_info *fs_info);
2673 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2674                          struct btrfs_root *root,
2675                          u64 bytenr, u64 num_bytes, u64 parent,
2676                          u64 root_objectid, u64 owner, u64 offset);
2677 
2678 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
2679                                    struct btrfs_fs_info *fs_info);
2680 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2681                                    struct btrfs_fs_info *fs_info);
2682 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2683                             struct btrfs_fs_info *fs_info);
2684 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2685 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2686 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2687 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2688 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2689                            struct btrfs_fs_info *fs_info, u64 bytes_used,
2690                            u64 type, u64 chunk_offset, u64 size);
2691 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2692                                 struct btrfs_fs_info *fs_info,
2693                                 const u64 chunk_offset);
2694 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2695                              struct btrfs_fs_info *fs_info, u64 group_start,
2696                              struct extent_map *em);
2697 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2698 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2699 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2700 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
2701                                        struct btrfs_fs_info *fs_info);
2702 u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info);
2703 u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info);
2704 u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info);
2705 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2706 
2707 enum btrfs_reserve_flush_enum {
2708         /* If we are in the transaction, we can't flush anything.*/
2709         BTRFS_RESERVE_NO_FLUSH,
2710         /*
2711          * Flushing delalloc may cause deadlock somewhere, in this
2712          * case, use FLUSH LIMIT
2713          */
2714         BTRFS_RESERVE_FLUSH_LIMIT,
2715         BTRFS_RESERVE_FLUSH_ALL,
2716 };
2717 
2718 enum btrfs_flush_state {
2719         FLUSH_DELAYED_ITEMS_NR  =       1,
2720         FLUSH_DELAYED_ITEMS     =       2,
2721         FLUSH_DELALLOC          =       3,
2722         FLUSH_DELALLOC_WAIT     =       4,
2723         ALLOC_CHUNK             =       5,
2724         COMMIT_TRANS            =       6,
2725 };
2726 
2727 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
2728 int btrfs_check_data_free_space(struct inode *inode,
2729                         struct extent_changeset **reserved, u64 start, u64 len);
2730 void btrfs_free_reserved_data_space(struct inode *inode,
2731                         struct extent_changeset *reserved, u64 start, u64 len);
2732 void btrfs_delalloc_release_space(struct inode *inode,
2733                         struct extent_changeset *reserved, u64 start, u64 len);
2734 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2735                                             u64 len);
2736 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
2737                                   struct btrfs_fs_info *fs_info);
2738 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2739 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
2740                                   struct btrfs_inode *inode);
2741 void btrfs_orphan_release_metadata(struct btrfs_inode *inode);
2742 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2743                                      struct btrfs_block_rsv *rsv,
2744                                      int nitems,
2745                                      u64 *qgroup_reserved, bool use_global_rsv);
2746 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2747                                       struct btrfs_block_rsv *rsv);
2748 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2749 
2750 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2751 void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes);
2752 int btrfs_delalloc_reserve_space(struct inode *inode,
2753                         struct extent_changeset **reserved, u64 start, u64 len);
2754 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2755 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2756                                               unsigned short type);
2757 void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
2758                                    struct btrfs_block_rsv *rsv,
2759                                    unsigned short type);
2760 void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2761                           struct btrfs_block_rsv *rsv);
2762 void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv);
2763 int btrfs_block_rsv_add(struct btrfs_root *root,
2764                         struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2765                         enum btrfs_reserve_flush_enum flush);
2766 int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2767 int btrfs_block_rsv_refill(struct btrfs_root *root,
2768                            struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2769                            enum btrfs_reserve_flush_enum flush);
2770 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2771                             struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2772                             int update_size);
2773 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2774                              struct btrfs_block_rsv *dest, u64 num_bytes,
2775                              int min_factor);
2776 void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2777                              struct btrfs_block_rsv *block_rsv,
2778                              u64 num_bytes);
2779 int btrfs_inc_block_group_ro(struct btrfs_fs_info *fs_info,
2780                              struct btrfs_block_group_cache *cache);
2781 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2782 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2783 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2784 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2785                                    u64 start, u64 end);
2786 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2787                          u64 num_bytes, u64 *actual_bytes);
2788 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
2789                             struct btrfs_fs_info *fs_info, u64 type);
2790 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2791 
2792 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2793 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2794                                          struct btrfs_fs_info *fs_info);
2795 int __get_raid_index(u64 flags);
2796 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2797 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2798 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2799 void check_system_chunk(struct btrfs_trans_handle *trans,
2800                         struct btrfs_fs_info *fs_info, const u64 type);
2801 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2802                        struct btrfs_fs_info *info, u64 start, u64 end);
2803 
2804 /* ctree.c */
2805 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2806                      int level, int *slot);
2807 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2808 int btrfs_previous_item(struct btrfs_root *root,
2809                         struct btrfs_path *path, u64 min_objectid,
2810                         int type);
2811 int btrfs_previous_extent_item(struct btrfs_root *root,
2812                         struct btrfs_path *path, u64 min_objectid);
2813 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2814                              struct btrfs_path *path,
2815                              const struct btrfs_key *new_key);
2816 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2817 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2818 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2819 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2820                         struct btrfs_key *key, int lowest_level,
2821                         u64 min_trans);
2822 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2823                          struct btrfs_path *path,
2824                          u64 min_trans);
2825 enum btrfs_compare_tree_result {
2826         BTRFS_COMPARE_TREE_NEW,
2827         BTRFS_COMPARE_TREE_DELETED,
2828         BTRFS_COMPARE_TREE_CHANGED,
2829         BTRFS_COMPARE_TREE_SAME,
2830 };
2831 typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
2832                                   struct btrfs_path *right_path,
2833                                   struct btrfs_key *key,
2834                                   enum btrfs_compare_tree_result result,
2835                                   void *ctx);
2836 int btrfs_compare_trees(struct btrfs_root *left_root,
2837                         struct btrfs_root *right_root,
2838                         btrfs_changed_cb_t cb, void *ctx);
2839 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2840                     struct btrfs_root *root, struct extent_buffer *buf,
2841                     struct extent_buffer *parent, int parent_slot,
2842                     struct extent_buffer **cow_ret);
2843 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2844                       struct btrfs_root *root,
2845                       struct extent_buffer *buf,
2846                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2847 int btrfs_block_can_be_shared(struct btrfs_root *root,
2848                               struct extent_buffer *buf);
2849 void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2850                        u32 data_size);
2851 void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2852                          struct btrfs_path *path, u32 new_size, int from_end);
2853 int btrfs_split_item(struct btrfs_trans_handle *trans,
2854                      struct btrfs_root *root,
2855                      struct btrfs_path *path,
2856                      const struct btrfs_key *new_key,
2857                      unsigned long split_offset);
2858 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2859                          struct btrfs_root *root,
2860                          struct btrfs_path *path,
2861                          const struct btrfs_key *new_key);
2862 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2863                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2864 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2865                       const struct btrfs_key *key, struct btrfs_path *p,
2866                       int ins_len, int cow);
2867 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2868                           struct btrfs_path *p, u64 time_seq);
2869 int btrfs_search_slot_for_read(struct btrfs_root *root,
2870                                const struct btrfs_key *key,
2871                                struct btrfs_path *p, int find_higher,
2872                                int return_any);
2873 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2874                        struct btrfs_root *root, struct extent_buffer *parent,
2875                        int start_slot, u64 *last_ret,
2876                        struct btrfs_key *progress);
2877 void btrfs_release_path(struct btrfs_path *p);
2878 struct btrfs_path *btrfs_alloc_path(void);
2879 void btrfs_free_path(struct btrfs_path *p);
2880 void btrfs_set_path_blocking(struct btrfs_path *p);
2881 void btrfs_clear_path_blocking(struct btrfs_path *p,
2882                                struct extent_buffer *held, int held_rw);
2883 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2884 
2885 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2886                    struct btrfs_path *path, int slot, int nr);
2887 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2888                                  struct btrfs_root *root,
2889                                  struct btrfs_path *path)
2890 {
2891         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2892 }
2893 
2894 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2895                             const struct btrfs_key *cpu_key, u32 *data_size,
2896                             u32 total_data, u32 total_size, int nr);
2897 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2898                       const struct btrfs_key *key, void *data, u32 data_size);
2899 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2900                              struct btrfs_root *root,
2901                              struct btrfs_path *path,
2902                              const struct btrfs_key *cpu_key, u32 *data_size,
2903                              int nr);
2904 
2905 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2906                                           struct btrfs_root *root,
2907                                           struct btrfs_path *path,
2908                                           const struct btrfs_key *key,
2909                                           u32 data_size)
2910 {
2911         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2912 }
2913 
2914 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2915 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2916 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2917                         u64 time_seq);
2918 static inline int btrfs_next_old_item(struct btrfs_root *root,
2919                                       struct btrfs_path *p, u64 time_seq)
2920 {
2921         ++p->slots[0];
2922         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2923                 return btrfs_next_old_leaf(root, p, time_seq);
2924         return 0;
2925 }
2926 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2927 {
2928         return btrfs_next_old_item(root, p, 0);
2929 }
2930 int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
2931                           struct extent_buffer *leaf);
2932 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2933                                      struct btrfs_block_rsv *block_rsv,
2934                                      int update_ref, int for_reloc);
2935 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2936                         struct btrfs_root *root,
2937                         struct extent_buffer *node,
2938                         struct extent_buffer *parent);
2939 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2940 {
2941         /*
2942          * Do it this way so we only ever do one test_bit in the normal case.
2943          */
2944         if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2945                 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2946                         return 2;
2947                 return 1;
2948         }
2949         return 0;
2950 }
2951 
2952 /*
2953  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2954  * anything except sleeping. This function is used to check the status of
2955  * the fs.
2956  */
2957 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2958 {
2959         return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
2960 }
2961 
2962 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2963 {
2964         kfree(fs_info->balance_ctl);
2965         kfree(fs_info->delayed_root);
2966         kfree(fs_info->extent_root);
2967         kfree(fs_info->tree_root);
2968         kfree(fs_info->chunk_root);
2969         kfree(fs_info->dev_root);
2970         kfree(fs_info->csum_root);
2971         kfree(fs_info->quota_root);
2972         kfree(fs_info->uuid_root);
2973         kfree(fs_info->free_space_root);
2974         kfree(fs_info->super_copy);
2975         kfree(fs_info->super_for_commit);
2976         security_free_mnt_opts(&fs_info->security_opts);
2977         kvfree(fs_info);
2978 }
2979 
2980 /* tree mod log functions from ctree.c */
2981 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2982                            struct seq_list *elem);
2983 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2984                             struct seq_list *elem);
2985 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2986 
2987 /* root-item.c */
2988 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2989                        struct btrfs_fs_info *fs_info,
2990                        u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2991                        const char *name, int name_len);
2992 int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2993                        struct btrfs_fs_info *fs_info,
2994                        u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2995                        const char *name, int name_len);
2996 int btrfs_del_root(struct btrfs_trans_handle *trans,
2997                    struct btrfs_fs_info *fs_info, const struct btrfs_key *key);
2998 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2999                       const struct btrfs_key *key,
3000                       struct btrfs_root_item *item);
3001 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3002                                    struct btrfs_root *root,
3003                                    struct btrfs_key *key,
3004                                    struct btrfs_root_item *item);
3005 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3006                     struct btrfs_path *path, struct btrfs_root_item *root_item,
3007                     struct btrfs_key *root_key);
3008 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3009 void btrfs_set_root_node(struct btrfs_root_item *item,
3010                          struct extent_buffer *node);
3011 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3012 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3013                              struct btrfs_root *root);
3014 
3015 /* uuid-tree.c */
3016 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
3017                         struct btrfs_fs_info *fs_info, u8 *uuid, u8 type,
3018                         u64 subid);
3019 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
3020                         struct btrfs_fs_info *fs_info, u8 *uuid, u8 type,
3021                         u64 subid);
3022 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
3023                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
3024                                               u64));
3025 
3026 /* dir-item.c */
3027 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3028                           const char *name, int name_len);
3029 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
3030                           struct btrfs_root *root, const char *name,
3031                           int name_len, struct btrfs_inode *dir,
3032                           struct btrfs_key *location, u8 type, u64 index);
3033 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3034                                              struct btrfs_root *root,
3035                                              struct btrfs_path *path, u64 dir,
3036                                              const char *name, int name_len,
3037                                              int mod);
3038 struct btrfs_dir_item *
3039 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3040                             struct btrfs_root *root,
3041                             struct btrfs_path *path, u64 dir,
3042                             u64 objectid, const char *name, int name_len,
3043                             int mod);
3044 struct btrfs_dir_item *
3045 btrfs_search_dir_index_item(struct btrfs_root *root,
3046                             struct btrfs_path *path, u64 dirid,
3047                             const char *name, int name_len);
3048 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3049                               struct btrfs_root *root,
3050                               struct btrfs_path *path,
3051                               struct btrfs_dir_item *di);
3052 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3053                             struct btrfs_root *root,
3054                             struct btrfs_path *path, u64 objectid,
3055                             const char *name, u16 name_len,
3056                             const void *data, u16 data_len);
3057 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3058                                           struct btrfs_root *root,
3059                                           struct btrfs_path *path, u64 dir,
3060                                           const char *name, u16 name_len,
3061                                           int mod);
3062 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3063                                                  struct btrfs_path *path,
3064                                                  const char *name,
3065                                                  int name_len);
3066 
3067 /* orphan.c */
3068 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3069                              struct btrfs_root *root, u64 offset);
3070 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3071                           struct btrfs_root *root, u64 offset);
3072 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3073 
3074 /* inode-item.c */
3075 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3076                            struct btrfs_root *root,
3077                            const char *name, int name_len,
3078                            u64 inode_objectid, u64 ref_objectid, u64 index);
3079 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3080                            struct btrfs_root *root,
3081                            const char *name, int name_len,
3082                            u64 inode_objectid, u64 ref_objectid, u64 *index);
3083 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3084                              struct btrfs_root *root,
3085                              struct btrfs_path *path, u64 objectid);
3086 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3087                        *root, struct btrfs_path *path,
3088                        struct btrfs_key *location, int mod);
3089 
3090 struct btrfs_inode_extref *
3091 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3092                           struct btrfs_root *root,
3093                           struct btrfs_path *path,
3094                           const char *name, int name_len,
3095                           u64 inode_objectid, u64 ref_objectid, int ins_len,
3096                           int cow);
3097 
3098 int btrfs_find_name_in_backref(struct extent_buffer *leaf, int slot,
3099                                const char *name,
3100                                int name_len, struct btrfs_inode_ref **ref_ret);
3101 int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
3102                                    u64 ref_objectid, const char *name,
3103                                    int name_len,
3104                                    struct btrfs_inode_extref **extref_ret);
3105 
3106 /* file-item.c */
3107 struct btrfs_dio_private;
3108 int btrfs_del_csums(struct btrfs_trans_handle *trans,
3109                     struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
3110 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3111 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3112                               u64 logical_offset);
3113 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3114                              struct btrfs_root *root,
3115                              u64 objectid, u64 pos,
3116                              u64 disk_offset, u64 disk_num_bytes,
3117                              u64 num_bytes, u64 offset, u64 ram_bytes,
3118                              u8 compression, u8 encryption, u16 other_encoding);
3119 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3120                              struct btrfs_root *root,
3121                              struct btrfs_path *path, u64 objectid,
3122                              u64 bytenr, int mod);
3123 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3124                            struct btrfs_root *root,
3125                            struct btrfs_ordered_sum *sums);
3126 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3127                        u64 file_start, int contig);
3128 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3129                              struct list_head *list, int search_commit);
3130 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3131                                      const struct btrfs_path *path,
3132                                      struct btrfs_file_extent_item *fi,
3133                                      const bool new_inline,
3134                                      struct extent_map *em);
3135 
3136 /* inode.c */
3137 struct btrfs_delalloc_work {
3138         struct inode *inode;
3139         int delay_iput;
3140         struct completion completion;
3141         struct list_head list;
3142         struct btrfs_work work;
3143 };
3144 
3145 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3146                                                     int delay_iput);
3147 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3148 
3149 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3150                 struct page *page, size_t pg_offset, u64 start,
3151                 u64 len, int create);
3152 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3153                               u64 *orig_start, u64 *orig_block_len,
3154                               u64 *ram_bytes);
3155 
3156 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3157                                 struct btrfs_inode *inode);
3158 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3159 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3160 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3161                        struct btrfs_root *root,
3162                        struct btrfs_inode *dir, struct btrfs_inode *inode,
3163                        const char *name, int name_len);
3164 int btrfs_add_link(struct btrfs_trans_handle *trans,
3165                    struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3166                    const char *name, int name_len, int add_backref, u64 index);
3167 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3168                         struct btrfs_root *root,
3169                         struct inode *dir, u64 objectid,
3170                         const char *name, int name_len);
3171 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3172                         int front);
3173 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3174                                struct btrfs_root *root,
3175                                struct inode *inode, u64 new_size,
3176                                u32 min_type);
3177 
3178 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3179 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
3180                                int nr);
3181 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3182                               unsigned int extra_bits,
3183                               struct extent_state **cached_state, int dedupe);
3184 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3185                              struct btrfs_root *new_root,
3186                              struct btrfs_root *parent_root,
3187                              u64 new_dirid);
3188 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3189                          size_t size, struct bio *bio,
3190                          unsigned long bio_flags);
3191 void btrfs_set_range_writeback(void *private_data, u64 start, u64 end);
3192 int btrfs_page_mkwrite(struct vm_fault *vmf);
3193 int btrfs_readpage(struct file *file, struct page *page);
3194 void btrfs_evict_inode(struct inode *inode);
3195 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3196 struct inode *btrfs_alloc_inode(struct super_block *sb);
3197 void btrfs_destroy_inode(struct inode *inode);
3198 int btrfs_drop_inode(struct inode *inode);
3199 int __init btrfs_init_cachep(void);
3200 void btrfs_destroy_cachep(void);
3201 long btrfs_ioctl_trans_end(struct file *file);
3202 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3203                          struct btrfs_root *root, int *was_new);
3204 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3205                 struct page *page, size_t pg_offset,
3206                 u64 start, u64 end, int create);
3207 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3208                               struct btrfs_root *root,
3209                               struct inode *inode);
3210 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3211                                 struct btrfs_root *root, struct inode *inode);
3212 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3213                 struct btrfs_inode *inode);
3214 int btrfs_orphan_cleanup(struct btrfs_root *root);
3215 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3216                               struct btrfs_root *root);
3217 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3218 void btrfs_invalidate_inodes(struct btrfs_root *root);
3219 void btrfs_add_delayed_iput(struct inode *inode);
3220 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3221 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3222                               u64 start, u64 num_bytes, u64 min_size,
3223                               loff_t actual_len, u64 *alloc_hint);
3224 int btrfs_prealloc_file_range_trans(struct inode *inode,
3225                                     struct btrfs_trans_handle *trans, int mode,
3226                                     u64 start, u64 num_bytes, u64 min_size,
3227                                     loff_t actual_len, u64 *alloc_hint);
3228 extern const struct dentry_operations btrfs_dentry_operations;
3229 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3230 void btrfs_test_inode_set_ops(struct inode *inode);
3231 #endif
3232 
3233 /* ioctl.c */
3234 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3235 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3236 int btrfs_ioctl_get_supported_features(void __user *arg);
3237 void btrfs_update_iflags(struct inode *inode);
3238 int btrfs_is_empty_uuid(u8 *uuid);
3239 int btrfs_defrag_file(struct inode *inode, struct file *file,
3240                       struct btrfs_ioctl_defrag_range_args *range,
3241                       u64 newer_than, unsigned long max_pages);
3242 void btrfs_get_block_group_info(struct list_head *groups_list,
3243                                 struct btrfs_ioctl_space_info *space);
3244 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3245                                struct btrfs_ioctl_balance_args *bargs);
3246 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3247                            struct file *dst_file, u64 dst_loff);
3248 
3249 /* file.c */
3250 int __init btrfs_auto_defrag_init(void);
3251 void btrfs_auto_defrag_exit(void);
3252 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3253                            struct btrfs_inode *inode);
3254 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3255 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3256 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3257 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3258                              int skip_pinned);
3259 extern const struct file_operations btrfs_file_operations;
3260 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3261                          struct btrfs_root *root, struct inode *inode,
3262                          struct btrfs_path *path, u64 start, u64 end,
3263                          u64 *drop_end, int drop_cache,
3264                          int replace_extent,
3265                          u32 extent_item_size,
3266                          int *key_inserted);
3267 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3268                        struct btrfs_root *root, struct inode *inode, u64 start,
3269                        u64 end, int drop_cache);
3270 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3271                               struct btrfs_inode *inode, u64 start, u64 end);
3272 int btrfs_release_file(struct inode *inode, struct file *file);
3273 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3274                       size_t num_pages, loff_t pos, size_t write_bytes,
3275                       struct extent_state **cached);
3276 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3277 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
3278                            struct file *file_out, loff_t pos_out, u64 len);
3279 
3280 /* tree-defrag.c */
3281 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3282                         struct btrfs_root *root);
3283 
3284 /* sysfs.c */
3285 int __init btrfs_init_sysfs(void);
3286 void btrfs_exit_sysfs(void);
3287 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3288 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3289 
3290 /* xattr.c */
3291 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3292 
3293 /* super.c */
3294 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3295                         unsigned long new_flags);
3296 int btrfs_sync_fs(struct super_block *sb, int wait);
3297 
3298 static inline __printf(2, 3)
3299 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3300 {
3301 }
3302 
3303 #ifdef CONFIG_PRINTK
3304 __printf(2, 3)
3305 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3306 #else
3307 #define btrfs_printk(fs_info, fmt, args...) \
3308         btrfs_no_printk(fs_info, fmt, ##args)
3309 #endif
3310 
3311 #define btrfs_emerg(fs_info, fmt, args...) \
3312         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3313 #define btrfs_alert(fs_info, fmt, args...) \
3314         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3315 #define btrfs_crit(fs_info, fmt, args...) \
3316         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3317 #define btrfs_err(fs_info, fmt, args...) \
3318         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3319 #define btrfs_warn(fs_info, fmt, args...) \
3320         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3321 #define btrfs_notice(fs_info, fmt, args...) \
3322         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3323 #define btrfs_info(fs_info, fmt, args...) \
3324         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3325 
3326 /*
3327  * Wrappers that use printk_in_rcu
3328  */
3329 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3330         btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3331 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3332         btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3333 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3334         btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3335 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3336         btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3337 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3338         btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3339 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3340         btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3341 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3342         btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3343 
3344 /*
3345  * Wrappers that use a ratelimited printk_in_rcu
3346  */
3347 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3348         btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3349 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3350         btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3351 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3352         btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3353 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3354         btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3355 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3356         btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3357 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3358         btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3359 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3360         btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3361 
3362 /*
3363  * Wrappers that use a ratelimited printk
3364  */
3365 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3366         btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3367 #define btrfs_alert_rl(fs_info, fmt, args...) \
3368         btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3369 #define btrfs_crit_rl(fs_info, fmt, args...) \
3370         btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3371 #define btrfs_err_rl(fs_info, fmt, args...) \
3372         btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3373 #define btrfs_warn_rl(fs_info, fmt, args...) \
3374         btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3375 #define btrfs_notice_rl(fs_info, fmt, args...) \
3376         btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3377 #define btrfs_info_rl(fs_info, fmt, args...) \
3378         btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3379 
3380 #if defined(CONFIG_DYNAMIC_DEBUG)
3381 #define btrfs_debug(fs_info, fmt, args...)                              \
3382 do {                                                                    \
3383         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3384         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3385                 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args);          \
3386 } while (0)
3387 #define btrfs_debug_in_rcu(fs_info, fmt, args...)                       \
3388 do {                                                                    \
3389         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3390         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3391                 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args);   \
3392 } while (0)
3393 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)                    \
3394 do {                                                                    \
3395         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3396         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3397                 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt,         \
3398                                        ##args);\
3399 } while (0)
3400 #define btrfs_debug_rl(fs_info, fmt, args...)                           \
3401 do {                                                                    \
3402         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
3403         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT))          \
3404                 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt,       \
3405                                          ##args);                       \
3406 } while (0)
3407 #elif defined(DEBUG)
3408 #define btrfs_debug(fs_info, fmt, args...) \
3409         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3410 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3411         btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3412 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3413         btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3414 #define btrfs_debug_rl(fs_info, fmt, args...) \
3415         btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3416 #else
3417 #define btrfs_debug(fs_info, fmt, args...) \
3418         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3419 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3420         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3421 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3422         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3423 #define btrfs_debug_rl(fs_info, fmt, args...) \
3424         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3425 #endif
3426 
3427 #define btrfs_printk_in_rcu(fs_info, fmt, args...)      \
3428 do {                                                    \
3429         rcu_read_lock();                                \
3430         btrfs_printk(fs_info, fmt, ##args);             \
3431         rcu_read_unlock();                              \
3432 } while (0)
3433 
3434 #define btrfs_printk_ratelimited(fs_info, fmt, args...)         \
3435 do {                                                            \
3436         static DEFINE_RATELIMIT_STATE(_rs,                      \
3437                 DEFAULT_RATELIMIT_INTERVAL,                     \
3438                 DEFAULT_RATELIMIT_BURST);                       \
3439         if (__ratelimit(&_rs))                                  \
3440                 btrfs_printk(fs_info, fmt, ##args);             \
3441 } while (0)
3442 
3443 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)           \
3444 do {                                                            \
3445         rcu_read_lock();                                        \
3446         btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
3447         rcu_read_unlock();                                      \
3448 } while (0)
3449 
3450 #ifdef CONFIG_BTRFS_ASSERT
3451 
3452 __cold
3453 static inline void assfail(char *expr, char *file, int line)
3454 {
3455         pr_err("assertion failed: %s, file: %s, line: %d\n",
3456                expr, file, line);
3457         BUG();
3458 }
3459 
3460 #define ASSERT(expr)    \
3461         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3462 #else
3463 #define ASSERT(expr)    ((void)0)
3464 #endif
3465 
3466 __printf(5, 6)
3467 __cold
3468 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3469                      unsigned int line, int errno, const char *fmt, ...);
3470 
3471 const char *btrfs_decode_error(int errno);
3472 
3473 __cold
3474 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3475                                const char *function,
3476                                unsigned int line, int errno);
3477 
3478 /*
3479  * Call btrfs_abort_transaction as early as possible when an error condition is
3480  * detected, that way the exact line number is reported.
3481  */
3482 #define btrfs_abort_transaction(trans, errno)           \
3483 do {                                                            \
3484         /* Report first abort since mount */                    \
3485         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
3486                         &((trans)->fs_info->fs_state))) {       \
3487                 if ((errno) != -EIO) {                          \
3488                         WARN(1, KERN_DEBUG                              \
3489                         "BTRFS: Transaction aborted (error %d)\n",      \
3490                         (errno));                                       \
3491                 } else {                                                \
3492                         btrfs_debug((trans)->fs_info,                   \
3493                                     "Transaction aborted (error %d)", \
3494                                   (errno));                     \
3495                 }                                               \
3496         }                                                       \
3497         __btrfs_abort_transaction((trans), __func__,            \
3498                                   __LINE__, (errno));           \
3499 } while (0)
3500 
3501 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)             \
3502 do {                                                            \
3503         __btrfs_handle_fs_error((fs_info), __func__, __LINE__,  \
3504                           (errno), fmt, ##args);                \
3505 } while (0)
3506 
3507 __printf(5, 6)
3508 __cold
3509 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3510                    unsigned int line, int errno, const char *fmt, ...);
3511 /*
3512  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3513  * will panic().  Otherwise we BUG() here.
3514  */
3515 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
3516 do {                                                                    \
3517         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3518         BUG();                                                          \
3519 } while (0)
3520 
3521 
3522 /* compatibility and incompatibility defines */
3523 
3524 #define btrfs_set_fs_incompat(__fs_info, opt) \
3525         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3526 
3527 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3528                                            u64 flag)
3529 {
3530         struct btrfs_super_block *disk_super;
3531         u64 features;
3532 
3533         disk_super = fs_info->super_copy;
3534         features = btrfs_super_incompat_flags(disk_super);
3535         if (!(features & flag)) {
3536                 spin_lock(&fs_info->super_lock);
3537                 features = btrfs_super_incompat_flags(disk_super);
3538                 if (!(features & flag)) {
3539                         features |= flag;
3540                         btrfs_set_super_incompat_flags(disk_super, features);
3541                         btrfs_info(fs_info, "setting %llu feature flag",
3542                                          flag);
3543                 }
3544                 spin_unlock(&fs_info->super_lock);
3545         }
3546 }
3547 
3548 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3549         __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3550 
3551 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3552                                              u64 flag)
3553 {
3554         struct btrfs_super_block *disk_super;
3555         u64 features;
3556 
3557         disk_super = fs_info->super_copy;
3558         features = btrfs_super_incompat_flags(disk_super);
3559         if (features & flag) {
3560                 spin_lock(&fs_info->super_lock);
3561                 features = btrfs_super_incompat_flags(disk_super);
3562                 if (features & flag) {
3563                         features &= ~flag;
3564                         btrfs_set_super_incompat_flags(disk_super, features);
3565                         btrfs_info(fs_info, "clearing %llu feature flag",
3566                                          flag);
3567                 }
3568                 spin_unlock(&fs_info->super_lock);
3569         }
3570 }
3571 
3572 #define btrfs_fs_incompat(fs_info, opt) \
3573         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3574 
3575 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3576 {
3577         struct btrfs_super_block *disk_super;
3578         disk_super = fs_info->super_copy;
3579         return !!(btrfs_super_incompat_flags(disk_super) & flag);
3580 }
3581 
3582 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3583         __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3584 
3585 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3586                                             u64 flag)
3587 {
3588         struct btrfs_super_block *disk_super;
3589         u64 features;
3590 
3591         disk_super = fs_info->super_copy;
3592         features = btrfs_super_compat_ro_flags(disk_super);
3593         if (!(features & flag)) {
3594                 spin_lock(&fs_info->super_lock);
3595                 features = btrfs_super_compat_ro_flags(disk_super);
3596                 if (!(features & flag)) {
3597                         features |= flag;
3598                         btrfs_set_super_compat_ro_flags(disk_super, features);
3599                         btrfs_info(fs_info, "setting %llu ro feature flag",
3600                                    flag);
3601                 }
3602                 spin_unlock(&fs_info->super_lock);
3603         }
3604 }
3605 
3606 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3607         __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3608 
3609 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3610                                               u64 flag)
3611 {
3612         struct btrfs_super_block *disk_super;
3613         u64 features;
3614 
3615         disk_super = fs_info->super_copy;
3616         features = btrfs_super_compat_ro_flags(disk_super);
3617         if (features & flag) {
3618                 spin_lock(&fs_info->super_lock);
3619                 features = btrfs_super_compat_ro_flags(disk_super);
3620                 if (features & flag) {
3621                         features &= ~flag;
3622                         btrfs_set_super_compat_ro_flags(disk_super, features);
3623                         btrfs_info(fs_info, "clearing %llu ro feature flag",
3624                                    flag);
3625                 }
3626                 spin_unlock(&fs_info->super_lock);
3627         }
3628 }
3629 
3630 #define btrfs_fs_compat_ro(fs_info, opt) \
3631         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3632 
3633 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3634 {
3635         struct btrfs_super_block *disk_super;
3636         disk_super = fs_info->super_copy;
3637         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3638 }
3639 
3640 /* acl.c */
3641 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3642 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3643 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3644 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3645                    struct inode *inode, struct inode *dir);
3646 #else
3647 #define btrfs_get_acl NULL
3648 #define btrfs_set_acl NULL
3649 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3650                                  struct inode *inode, struct inode *dir)
3651 {
3652         return 0;
3653 }
3654 #endif
3655 
3656 /* relocation.c */
3657 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3658 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3659                           struct btrfs_root *root);
3660 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3661                             struct btrfs_root *root);
3662 int btrfs_recover_relocation(struct btrfs_root *root);
3663 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3664 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3665                           struct btrfs_root *root, struct extent_buffer *buf,
3666                           struct extent_buffer *cow);
3667 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3668                               u64 *bytes_to_reserve);
3669 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3670                               struct btrfs_pending_snapshot *pending);
3671 
3672 /* scrub.c */
3673 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3674                     u64 end, struct btrfs_scrub_progress *progress,
3675                     int readonly, int is_dev_replace);
3676 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3677 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3678 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3679 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3680                            struct btrfs_device *dev);
3681 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3682                          struct btrfs_scrub_progress *progress);
3683 static inline void btrfs_init_full_stripe_locks_tree(
3684                         struct btrfs_full_stripe_locks_tree *locks_root)
3685 {
3686         locks_root->root = RB_ROOT;
3687         mutex_init(&locks_root->lock);
3688 }
3689 
3690 /* dev-replace.c */
3691 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3692 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3693 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3694 
3695 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3696 {
3697         btrfs_bio_counter_sub(fs_info, 1);
3698 }
3699 
3700 /* reada.c */
3701 struct reada_control {
3702         struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
3703         struct btrfs_key        key_start;
3704         struct btrfs_key        key_end;        /* exclusive */
3705         atomic_t                elems;
3706         struct kref             refcnt;
3707         wait_queue_head_t       wait;
3708 };
3709 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3710                               struct btrfs_key *start, struct btrfs_key *end);
3711 int btrfs_reada_wait(void *handle);
3712 void btrfs_reada_detach(void *handle);
3713 int btree_readahead_hook(struct extent_buffer *eb, int err);
3714 
3715 static inline int is_fstree(u64 rootid)
3716 {
3717         if (rootid == BTRFS_FS_TREE_OBJECTID ||
3718             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3719               !btrfs_qgroup_level(rootid)))
3720                 return 1;
3721         return 0;
3722 }
3723 
3724 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3725 {
3726         return signal_pending(current);
3727 }
3728 
3729 /* Sanity test specific functions */
3730 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3731 void btrfs_test_destroy_inode(struct inode *inode);
3732 #endif
3733 
3734 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3735 {
3736 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3737         if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
3738                               &fs_info->fs_state)))
3739                 return 1;
3740 #endif
3741         return 0;
3742 }
3743 #endif
3744 

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