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

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