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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Copyright (C) 2007 Oracle.  All rights reserved.
  4  */
  5 
  6 #ifndef BTRFS_CTREE_H
  7 #define BTRFS_CTREE_H
  8 
  9 #include <linux/mm.h>
 10 #include <linux/sched/signal.h>
 11 #include <linux/highmem.h>
 12 #include <linux/fs.h>
 13 #include <linux/rwsem.h>
 14 #include <linux/semaphore.h>
 15 #include <linux/completion.h>
 16 #include <linux/backing-dev.h>
 17 #include <linux/wait.h>
 18 #include <linux/slab.h>
 19 #include <linux/kobject.h>
 20 #include <trace/events/btrfs.h>
 21 #include <asm/kmap_types.h>
 22 #include <asm/unaligned.h>
 23 #include <linux/pagemap.h>
 24 #include <linux/btrfs.h>
 25 #include <linux/btrfs_tree.h>
 26 #include <linux/workqueue.h>
 27 #include <linux/security.h>
 28 #include <linux/sizes.h>
 29 #include <linux/dynamic_debug.h>
 30 #include <linux/refcount.h>
 31 #include <linux/crc32c.h>
 32 #include "extent_io.h"
 33 #include "extent_map.h"
 34 #include "async-thread.h"
 35 #include "block-rsv.h"
 36 
 37 struct btrfs_trans_handle;
 38 struct btrfs_transaction;
 39 struct btrfs_pending_snapshot;
 40 struct btrfs_delayed_ref_root;
 41 struct btrfs_space_info;
 42 extern struct kmem_cache *btrfs_trans_handle_cachep;
 43 extern struct kmem_cache *btrfs_bit_radix_cachep;
 44 extern struct kmem_cache *btrfs_path_cachep;
 45 extern struct kmem_cache *btrfs_free_space_cachep;
 46 extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
 47 struct btrfs_ordered_sum;
 48 struct btrfs_ref;
 49 
 50 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
 51 
 52 /*
 53  * Maximum number of mirrors that can be available for all profiles counting
 54  * the target device of dev-replace as one. During an active device replace
 55  * procedure, the target device of the copy operation is a mirror for the
 56  * filesystem data as well that can be used to read data in order to repair
 57  * read errors on other disks.
 58  *
 59  * Current value is derived from RAID1 with 2 copies.
 60  */
 61 #define BTRFS_MAX_MIRRORS (2 + 1)
 62 
 63 #define BTRFS_MAX_LEVEL 8
 64 
 65 #define BTRFS_OLDEST_GENERATION 0ULL
 66 
 67 /*
 68  * the max metadata block size.  This limit is somewhat artificial,
 69  * but the memmove costs go through the roof for larger blocks.
 70  */
 71 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536
 72 
 73 /*
 74  * we can actually store much bigger names, but lets not confuse the rest
 75  * of linux
 76  */
 77 #define BTRFS_NAME_LEN 255
 78 
 79 /*
 80  * Theoretical limit is larger, but we keep this down to a sane
 81  * value. That should limit greatly the possibility of collisions on
 82  * inode ref items.
 83  */
 84 #define BTRFS_LINK_MAX 65535U
 85 
 86 /* four bytes for CRC32 */
 87 static const int btrfs_csum_sizes[] = { 4 };
 88 static const char *btrfs_csum_names[] = { "crc32c" };
 89 
 90 #define BTRFS_EMPTY_DIR_SIZE 0
 91 
 92 /* ioprio of readahead is set to idle */
 93 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
 94 
 95 #define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
 96 
 97 /*
 98  * Use large batch size to reduce overhead of metadata updates.  On the reader
 99  * side, we only read it when we are close to ENOSPC and the read overhead is
100  * mostly related to the number of CPUs, so it is OK to use arbitrary large
101  * value here.
102  */
103 #define BTRFS_TOTAL_BYTES_PINNED_BATCH  SZ_128M
104 
105 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
106 
107 
108 /*
109  * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
110  */
111 static inline u32 count_max_extents(u64 size)
112 {
113         return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
114 }
115 
116 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
117 {
118         BUG_ON(num_stripes == 0);
119         return sizeof(struct btrfs_chunk) +
120                 sizeof(struct btrfs_stripe) * (num_stripes - 1);
121 }
122 
123 /*
124  * Runtime (in-memory) states of filesystem
125  */
126 enum {
127         /* Global indicator of serious filesystem errors */
128         BTRFS_FS_STATE_ERROR,
129         /*
130          * Filesystem is being remounted, allow to skip some operations, like
131          * defrag
132          */
133         BTRFS_FS_STATE_REMOUNTING,
134         /* Track if a transaction abort has been reported on this filesystem */
135         BTRFS_FS_STATE_TRANS_ABORTED,
136         /*
137          * Bio operations should be blocked on this filesystem because a source
138          * or target device is being destroyed as part of a device replace
139          */
140         BTRFS_FS_STATE_DEV_REPLACING,
141         /* The btrfs_fs_info created for self-tests */
142         BTRFS_FS_STATE_DUMMY_FS_INFO,
143 };
144 
145 #define BTRFS_BACKREF_REV_MAX           256
146 #define BTRFS_BACKREF_REV_SHIFT         56
147 #define BTRFS_BACKREF_REV_MASK          (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
148                                          BTRFS_BACKREF_REV_SHIFT)
149 
150 #define BTRFS_OLD_BACKREF_REV           0
151 #define BTRFS_MIXED_BACKREF_REV         1
152 
153 /*
154  * every tree block (leaf or node) starts with this header.
155  */
156 struct btrfs_header {
157         /* these first four must match the super block */
158         u8 csum[BTRFS_CSUM_SIZE];
159         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
160         __le64 bytenr; /* which block this node is supposed to live in */
161         __le64 flags;
162 
163         /* allowed to be different from the super from here on down */
164         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
165         __le64 generation;
166         __le64 owner;
167         __le32 nritems;
168         u8 level;
169 } __attribute__ ((__packed__));
170 
171 /*
172  * this is a very generous portion of the super block, giving us
173  * room to translate 14 chunks with 3 stripes each.
174  */
175 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
176 
177 /*
178  * just in case we somehow lose the roots and are not able to mount,
179  * we store an array of the roots from previous transactions
180  * in the super.
181  */
182 #define BTRFS_NUM_BACKUP_ROOTS 4
183 struct btrfs_root_backup {
184         __le64 tree_root;
185         __le64 tree_root_gen;
186 
187         __le64 chunk_root;
188         __le64 chunk_root_gen;
189 
190         __le64 extent_root;
191         __le64 extent_root_gen;
192 
193         __le64 fs_root;
194         __le64 fs_root_gen;
195 
196         __le64 dev_root;
197         __le64 dev_root_gen;
198 
199         __le64 csum_root;
200         __le64 csum_root_gen;
201 
202         __le64 total_bytes;
203         __le64 bytes_used;
204         __le64 num_devices;
205         /* future */
206         __le64 unused_64[4];
207 
208         u8 tree_root_level;
209         u8 chunk_root_level;
210         u8 extent_root_level;
211         u8 fs_root_level;
212         u8 dev_root_level;
213         u8 csum_root_level;
214         /* future and to align */
215         u8 unused_8[10];
216 } __attribute__ ((__packed__));
217 
218 /*
219  * the super block basically lists the main trees of the FS
220  * it currently lacks any block count etc etc
221  */
222 struct btrfs_super_block {
223         /* the first 4 fields must match struct btrfs_header */
224         u8 csum[BTRFS_CSUM_SIZE];
225         /* FS specific UUID, visible to user */
226         u8 fsid[BTRFS_FSID_SIZE];
227         __le64 bytenr; /* this block number */
228         __le64 flags;
229 
230         /* allowed to be different from the btrfs_header from here own down */
231         __le64 magic;
232         __le64 generation;
233         __le64 root;
234         __le64 chunk_root;
235         __le64 log_root;
236 
237         /* this will help find the new super based on the log root */
238         __le64 log_root_transid;
239         __le64 total_bytes;
240         __le64 bytes_used;
241         __le64 root_dir_objectid;
242         __le64 num_devices;
243         __le32 sectorsize;
244         __le32 nodesize;
245         __le32 __unused_leafsize;
246         __le32 stripesize;
247         __le32 sys_chunk_array_size;
248         __le64 chunk_root_generation;
249         __le64 compat_flags;
250         __le64 compat_ro_flags;
251         __le64 incompat_flags;
252         __le16 csum_type;
253         u8 root_level;
254         u8 chunk_root_level;
255         u8 log_root_level;
256         struct btrfs_dev_item dev_item;
257 
258         char label[BTRFS_LABEL_SIZE];
259 
260         __le64 cache_generation;
261         __le64 uuid_tree_generation;
262 
263         /* the UUID written into btree blocks */
264         u8 metadata_uuid[BTRFS_FSID_SIZE];
265 
266         /* future expansion */
267         __le64 reserved[28];
268         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
269         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
270 } __attribute__ ((__packed__));
271 
272 /*
273  * Compat flags that we support.  If any incompat flags are set other than the
274  * ones specified below then we will fail to mount
275  */
276 #define BTRFS_FEATURE_COMPAT_SUPP               0ULL
277 #define BTRFS_FEATURE_COMPAT_SAFE_SET           0ULL
278 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR         0ULL
279 
280 #define BTRFS_FEATURE_COMPAT_RO_SUPP                    \
281         (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |      \
282          BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
283 
284 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET        0ULL
285 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR      0ULL
286 
287 #define BTRFS_FEATURE_INCOMPAT_SUPP                     \
288         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |         \
289          BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |        \
290          BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |          \
291          BTRFS_FEATURE_INCOMPAT_BIG_METADATA |          \
292          BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |          \
293          BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |         \
294          BTRFS_FEATURE_INCOMPAT_RAID56 |                \
295          BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
296          BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
297          BTRFS_FEATURE_INCOMPAT_NO_HOLES        |       \
298          BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
299 
300 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                 \
301         (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
302 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR               0ULL
303 
304 /*
305  * A leaf is full of items. offset and size tell us where to find
306  * the item in the leaf (relative to the start of the data area)
307  */
308 struct btrfs_item {
309         struct btrfs_disk_key key;
310         __le32 offset;
311         __le32 size;
312 } __attribute__ ((__packed__));
313 
314 /*
315  * leaves have an item area and a data area:
316  * [item0, item1....itemN] [free space] [dataN...data1, data0]
317  *
318  * The data is separate from the items to get the keys closer together
319  * during searches.
320  */
321 struct btrfs_leaf {
322         struct btrfs_header header;
323         struct btrfs_item items[];
324 } __attribute__ ((__packed__));
325 
326 /*
327  * all non-leaf blocks are nodes, they hold only keys and pointers to
328  * other blocks
329  */
330 struct btrfs_key_ptr {
331         struct btrfs_disk_key key;
332         __le64 blockptr;
333         __le64 generation;
334 } __attribute__ ((__packed__));
335 
336 struct btrfs_node {
337         struct btrfs_header header;
338         struct btrfs_key_ptr ptrs[];
339 } __attribute__ ((__packed__));
340 
341 /*
342  * btrfs_paths remember the path taken from the root down to the leaf.
343  * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
344  * to any other levels that are present.
345  *
346  * The slots array records the index of the item or block pointer
347  * used while walking the tree.
348  */
349 enum { READA_NONE, READA_BACK, READA_FORWARD };
350 struct btrfs_path {
351         struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
352         int slots[BTRFS_MAX_LEVEL];
353         /* if there is real range locking, this locks field will change */
354         u8 locks[BTRFS_MAX_LEVEL];
355         u8 reada;
356         /* keep some upper locks as we walk down */
357         u8 lowest_level;
358 
359         /*
360          * set by btrfs_split_item, tells search_slot to keep all locks
361          * and to force calls to keep space in the nodes
362          */
363         unsigned int search_for_split:1;
364         unsigned int keep_locks:1;
365         unsigned int skip_locking:1;
366         unsigned int leave_spinning:1;
367         unsigned int search_commit_root:1;
368         unsigned int need_commit_sem:1;
369         unsigned int skip_release_on_error:1;
370 };
371 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
372                                         sizeof(struct btrfs_item))
373 struct btrfs_dev_replace {
374         u64 replace_state;      /* see #define above */
375         time64_t time_started;  /* seconds since 1-Jan-1970 */
376         time64_t time_stopped;  /* seconds since 1-Jan-1970 */
377         atomic64_t num_write_errors;
378         atomic64_t num_uncorrectable_read_errors;
379 
380         u64 cursor_left;
381         u64 committed_cursor_left;
382         u64 cursor_left_last_write_of_item;
383         u64 cursor_right;
384 
385         u64 cont_reading_from_srcdev_mode;      /* see #define above */
386 
387         int is_valid;
388         int item_needs_writeback;
389         struct btrfs_device *srcdev;
390         struct btrfs_device *tgtdev;
391 
392         struct mutex lock_finishing_cancel_unmount;
393         struct rw_semaphore rwsem;
394 
395         struct btrfs_scrub_progress scrub_progress;
396 
397         struct percpu_counter bio_counter;
398         wait_queue_head_t replace_wait;
399 };
400 
401 /* For raid type sysfs entries */
402 struct raid_kobject {
403         u64 flags;
404         struct kobject kobj;
405 };
406 
407 /*
408  * free clusters are used to claim free space in relatively large chunks,
409  * allowing us to do less seeky writes. They are used for all metadata
410  * allocations. In ssd_spread mode they are also used for data allocations.
411  */
412 struct btrfs_free_cluster {
413         spinlock_t lock;
414         spinlock_t refill_lock;
415         struct rb_root root;
416 
417         /* largest extent in this cluster */
418         u64 max_size;
419 
420         /* first extent starting offset */
421         u64 window_start;
422 
423         /* We did a full search and couldn't create a cluster */
424         bool fragmented;
425 
426         struct btrfs_block_group_cache *block_group;
427         /*
428          * when a cluster is allocated from a block group, we put the
429          * cluster onto a list in the block group so that it can
430          * be freed before the block group is freed.
431          */
432         struct list_head block_group_list;
433 };
434 
435 enum btrfs_caching_type {
436         BTRFS_CACHE_NO,
437         BTRFS_CACHE_STARTED,
438         BTRFS_CACHE_FAST,
439         BTRFS_CACHE_FINISHED,
440         BTRFS_CACHE_ERROR,
441 };
442 
443 enum btrfs_disk_cache_state {
444         BTRFS_DC_WRITTEN,
445         BTRFS_DC_ERROR,
446         BTRFS_DC_CLEAR,
447         BTRFS_DC_SETUP,
448 };
449 
450 struct btrfs_caching_control {
451         struct list_head list;
452         struct mutex mutex;
453         wait_queue_head_t wait;
454         struct btrfs_work work;
455         struct btrfs_block_group_cache *block_group;
456         u64 progress;
457         refcount_t count;
458 };
459 
460 /* Once caching_thread() finds this much free space, it will wake up waiters. */
461 #define CACHING_CTL_WAKE_UP SZ_2M
462 
463 struct btrfs_io_ctl {
464         void *cur, *orig;
465         struct page *page;
466         struct page **pages;
467         struct btrfs_fs_info *fs_info;
468         struct inode *inode;
469         unsigned long size;
470         int index;
471         int num_pages;
472         int entries;
473         int bitmaps;
474         unsigned check_crcs:1;
475 };
476 
477 /*
478  * Tree to record all locked full stripes of a RAID5/6 block group
479  */
480 struct btrfs_full_stripe_locks_tree {
481         struct rb_root root;
482         struct mutex lock;
483 };
484 
485 struct btrfs_block_group_cache {
486         struct btrfs_key key;
487         struct btrfs_block_group_item item;
488         struct btrfs_fs_info *fs_info;
489         struct inode *inode;
490         spinlock_t lock;
491         u64 pinned;
492         u64 reserved;
493         u64 delalloc_bytes;
494         u64 bytes_super;
495         u64 flags;
496         u64 cache_generation;
497 
498         /*
499          * If the free space extent count exceeds this number, convert the block
500          * group to bitmaps.
501          */
502         u32 bitmap_high_thresh;
503 
504         /*
505          * If the free space extent count drops below this number, convert the
506          * block group back to extents.
507          */
508         u32 bitmap_low_thresh;
509 
510         /*
511          * It is just used for the delayed data space allocation because
512          * only the data space allocation and the relative metadata update
513          * can be done cross the transaction.
514          */
515         struct rw_semaphore data_rwsem;
516 
517         /* for raid56, this is a full stripe, without parity */
518         unsigned long full_stripe_len;
519 
520         unsigned int ro;
521         unsigned int iref:1;
522         unsigned int has_caching_ctl:1;
523         unsigned int removed:1;
524 
525         int disk_cache_state;
526 
527         /* cache tracking stuff */
528         int cached;
529         struct btrfs_caching_control *caching_ctl;
530         u64 last_byte_to_unpin;
531 
532         struct btrfs_space_info *space_info;
533 
534         /* free space cache stuff */
535         struct btrfs_free_space_ctl *free_space_ctl;
536 
537         /* block group cache stuff */
538         struct rb_node cache_node;
539 
540         /* for block groups in the same raid type */
541         struct list_head list;
542 
543         /* usage count */
544         atomic_t count;
545 
546         /* List of struct btrfs_free_clusters for this block group.
547          * Today it will only have one thing on it, but that may change
548          */
549         struct list_head cluster_list;
550 
551         /* For delayed block group creation or deletion of empty block groups */
552         struct list_head bg_list;
553 
554         /* For read-only block groups */
555         struct list_head ro_list;
556 
557         atomic_t trimming;
558 
559         /* For dirty block groups */
560         struct list_head dirty_list;
561         struct list_head io_list;
562 
563         struct btrfs_io_ctl io_ctl;
564 
565         /*
566          * Incremented when doing extent allocations and holding a read lock
567          * on the space_info's groups_sem semaphore.
568          * Decremented when an ordered extent that represents an IO against this
569          * block group's range is created (after it's added to its inode's
570          * root's list of ordered extents) or immediately after the allocation
571          * if it's a metadata extent or fallocate extent (for these cases we
572          * don't create ordered extents).
573          */
574         atomic_t reservations;
575 
576         /*
577          * Incremented while holding the spinlock *lock* by a task checking if
578          * it can perform a nocow write (incremented if the value for the *ro*
579          * field is 0). Decremented by such tasks once they create an ordered
580          * extent or before that if some error happens before reaching that step.
581          * This is to prevent races between block group relocation and nocow
582          * writes through direct IO.
583          */
584         atomic_t nocow_writers;
585 
586         /* Lock for free space tree operations. */
587         struct mutex free_space_lock;
588 
589         /*
590          * Does the block group need to be added to the free space tree?
591          * Protected by free_space_lock.
592          */
593         int needs_free_space;
594 
595         /* Record locked full stripes for RAID5/6 block group */
596         struct btrfs_full_stripe_locks_tree full_stripe_locks_root;
597 };
598 
599 /* delayed seq elem */
600 struct seq_list {
601         struct list_head list;
602         u64 seq;
603 };
604 
605 #define SEQ_LIST_INIT(name)     { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
606 
607 #define SEQ_LAST        ((u64)-1)
608 
609 enum btrfs_orphan_cleanup_state {
610         ORPHAN_CLEANUP_STARTED  = 1,
611         ORPHAN_CLEANUP_DONE     = 2,
612 };
613 
614 /* used by the raid56 code to lock stripes for read/modify/write */
615 struct btrfs_stripe_hash {
616         struct list_head hash_list;
617         spinlock_t lock;
618 };
619 
620 /* used by the raid56 code to lock stripes for read/modify/write */
621 struct btrfs_stripe_hash_table {
622         struct list_head stripe_cache;
623         spinlock_t cache_lock;
624         int cache_size;
625         struct btrfs_stripe_hash table[];
626 };
627 
628 #define BTRFS_STRIPE_HASH_TABLE_BITS 11
629 
630 void btrfs_init_async_reclaim_work(struct work_struct *work);
631 
632 /* fs_info */
633 struct reloc_control;
634 struct btrfs_device;
635 struct btrfs_fs_devices;
636 struct btrfs_balance_control;
637 struct btrfs_delayed_root;
638 
639 /*
640  * Block group or device which contains an active swapfile. Used for preventing
641  * unsafe operations while a swapfile is active.
642  *
643  * These are sorted on (ptr, inode) (note that a block group or device can
644  * contain more than one swapfile). We compare the pointer values because we
645  * don't actually care what the object is, we just need a quick check whether
646  * the object exists in the rbtree.
647  */
648 struct btrfs_swapfile_pin {
649         struct rb_node node;
650         void *ptr;
651         struct inode *inode;
652         /*
653          * If true, ptr points to a struct btrfs_block_group_cache. Otherwise,
654          * ptr points to a struct btrfs_device.
655          */
656         bool is_block_group;
657 };
658 
659 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
660 
661 enum {
662         BTRFS_FS_BARRIER,
663         BTRFS_FS_CLOSING_START,
664         BTRFS_FS_CLOSING_DONE,
665         BTRFS_FS_LOG_RECOVERING,
666         BTRFS_FS_OPEN,
667         BTRFS_FS_QUOTA_ENABLED,
668         BTRFS_FS_UPDATE_UUID_TREE_GEN,
669         BTRFS_FS_CREATING_FREE_SPACE_TREE,
670         BTRFS_FS_BTREE_ERR,
671         BTRFS_FS_LOG1_ERR,
672         BTRFS_FS_LOG2_ERR,
673         BTRFS_FS_QUOTA_OVERRIDE,
674         /* Used to record internally whether fs has been frozen */
675         BTRFS_FS_FROZEN,
676         /*
677          * Indicate that a whole-filesystem exclusive operation is running
678          * (device replace, resize, device add/delete, balance)
679          */
680         BTRFS_FS_EXCL_OP,
681         /*
682          * To info transaction_kthread we need an immediate commit so it
683          * doesn't need to wait for commit_interval
684          */
685         BTRFS_FS_NEED_ASYNC_COMMIT,
686         /*
687          * Indicate that balance has been set up from the ioctl and is in the
688          * main phase. The fs_info::balance_ctl is initialized.
689          * Set and cleared while holding fs_info::balance_mutex.
690          */
691         BTRFS_FS_BALANCE_RUNNING,
692 
693         /* Indicate that the cleaner thread is awake and doing something. */
694         BTRFS_FS_CLEANER_RUNNING,
695 
696         /*
697          * The checksumming has an optimized version and is considered fast,
698          * so we don't need to offload checksums to workqueues.
699          */
700         BTRFS_FS_CSUM_IMPL_FAST,
701 };
702 
703 struct btrfs_fs_info {
704         u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
705         unsigned long flags;
706         struct btrfs_root *extent_root;
707         struct btrfs_root *tree_root;
708         struct btrfs_root *chunk_root;
709         struct btrfs_root *dev_root;
710         struct btrfs_root *fs_root;
711         struct btrfs_root *csum_root;
712         struct btrfs_root *quota_root;
713         struct btrfs_root *uuid_root;
714         struct btrfs_root *free_space_root;
715 
716         /* the log root tree is a directory of all the other log roots */
717         struct btrfs_root *log_root_tree;
718 
719         spinlock_t fs_roots_radix_lock;
720         struct radix_tree_root fs_roots_radix;
721 
722         /* block group cache stuff */
723         spinlock_t block_group_cache_lock;
724         u64 first_logical_byte;
725         struct rb_root block_group_cache_tree;
726 
727         /* keep track of unallocated space */
728         atomic64_t free_chunk_space;
729 
730         struct extent_io_tree freed_extents[2];
731         struct extent_io_tree *pinned_extents;
732 
733         /* logical->physical extent mapping */
734         struct extent_map_tree mapping_tree;
735 
736         /*
737          * block reservation for extent, checksum, root tree and
738          * delayed dir index item
739          */
740         struct btrfs_block_rsv global_block_rsv;
741         /* block reservation for metadata operations */
742         struct btrfs_block_rsv trans_block_rsv;
743         /* block reservation for chunk tree */
744         struct btrfs_block_rsv chunk_block_rsv;
745         /* block reservation for delayed operations */
746         struct btrfs_block_rsv delayed_block_rsv;
747         /* block reservation for delayed refs */
748         struct btrfs_block_rsv delayed_refs_rsv;
749 
750         struct btrfs_block_rsv empty_block_rsv;
751 
752         u64 generation;
753         u64 last_trans_committed;
754         u64 avg_delayed_ref_runtime;
755 
756         /*
757          * this is updated to the current trans every time a full commit
758          * is required instead of the faster short fsync log commits
759          */
760         u64 last_trans_log_full_commit;
761         unsigned long mount_opt;
762         /*
763          * Track requests for actions that need to be done during transaction
764          * commit (like for some mount options).
765          */
766         unsigned long pending_changes;
767         unsigned long compress_type:4;
768         unsigned int compress_level;
769         u32 commit_interval;
770         /*
771          * It is a suggestive number, the read side is safe even it gets a
772          * wrong number because we will write out the data into a regular
773          * extent. The write side(mount/remount) is under ->s_umount lock,
774          * so it is also safe.
775          */
776         u64 max_inline;
777 
778         struct btrfs_transaction *running_transaction;
779         wait_queue_head_t transaction_throttle;
780         wait_queue_head_t transaction_wait;
781         wait_queue_head_t transaction_blocked_wait;
782         wait_queue_head_t async_submit_wait;
783 
784         /*
785          * Used to protect the incompat_flags, compat_flags, compat_ro_flags
786          * when they are updated.
787          *
788          * Because we do not clear the flags for ever, so we needn't use
789          * the lock on the read side.
790          *
791          * We also needn't use the lock when we mount the fs, because
792          * there is no other task which will update the flag.
793          */
794         spinlock_t super_lock;
795         struct btrfs_super_block *super_copy;
796         struct btrfs_super_block *super_for_commit;
797         struct super_block *sb;
798         struct inode *btree_inode;
799         struct mutex tree_log_mutex;
800         struct mutex transaction_kthread_mutex;
801         struct mutex cleaner_mutex;
802         struct mutex chunk_mutex;
803 
804         /*
805          * this is taken to make sure we don't set block groups ro after
806          * the free space cache has been allocated on them
807          */
808         struct mutex ro_block_group_mutex;
809 
810         /* this is used during read/modify/write to make sure
811          * no two ios are trying to mod the same stripe at the same
812          * time
813          */
814         struct btrfs_stripe_hash_table *stripe_hash_table;
815 
816         /*
817          * this protects the ordered operations list only while we are
818          * processing all of the entries on it.  This way we make
819          * sure the commit code doesn't find the list temporarily empty
820          * because another function happens to be doing non-waiting preflush
821          * before jumping into the main commit.
822          */
823         struct mutex ordered_operations_mutex;
824 
825         struct rw_semaphore commit_root_sem;
826 
827         struct rw_semaphore cleanup_work_sem;
828 
829         struct rw_semaphore subvol_sem;
830         struct srcu_struct subvol_srcu;
831 
832         spinlock_t trans_lock;
833         /*
834          * the reloc mutex goes with the trans lock, it is taken
835          * during commit to protect us from the relocation code
836          */
837         struct mutex reloc_mutex;
838 
839         struct list_head trans_list;
840         struct list_head dead_roots;
841         struct list_head caching_block_groups;
842 
843         spinlock_t delayed_iput_lock;
844         struct list_head delayed_iputs;
845         atomic_t nr_delayed_iputs;
846         wait_queue_head_t delayed_iputs_wait;
847 
848         /* this protects tree_mod_seq_list */
849         spinlock_t tree_mod_seq_lock;
850         atomic64_t tree_mod_seq;
851         struct list_head tree_mod_seq_list;
852 
853         /* this protects tree_mod_log */
854         rwlock_t tree_mod_log_lock;
855         struct rb_root tree_mod_log;
856 
857         atomic_t async_delalloc_pages;
858 
859         /*
860          * this is used to protect the following list -- ordered_roots.
861          */
862         spinlock_t ordered_root_lock;
863 
864         /*
865          * all fs/file tree roots in which there are data=ordered extents
866          * pending writeback are added into this list.
867          *
868          * these can span multiple transactions and basically include
869          * every dirty data page that isn't from nodatacow
870          */
871         struct list_head ordered_roots;
872 
873         struct mutex delalloc_root_mutex;
874         spinlock_t delalloc_root_lock;
875         /* all fs/file tree roots that have delalloc inodes. */
876         struct list_head delalloc_roots;
877 
878         /*
879          * there is a pool of worker threads for checksumming during writes
880          * and a pool for checksumming after reads.  This is because readers
881          * can run with FS locks held, and the writers may be waiting for
882          * those locks.  We don't want ordering in the pending list to cause
883          * deadlocks, and so the two are serviced separately.
884          *
885          * A third pool does submit_bio to avoid deadlocking with the other
886          * two
887          */
888         struct btrfs_workqueue *workers;
889         struct btrfs_workqueue *delalloc_workers;
890         struct btrfs_workqueue *flush_workers;
891         struct btrfs_workqueue *endio_workers;
892         struct btrfs_workqueue *endio_meta_workers;
893         struct btrfs_workqueue *endio_raid56_workers;
894         struct btrfs_workqueue *endio_repair_workers;
895         struct btrfs_workqueue *rmw_workers;
896         struct btrfs_workqueue *endio_meta_write_workers;
897         struct btrfs_workqueue *endio_write_workers;
898         struct btrfs_workqueue *endio_freespace_worker;
899         struct btrfs_workqueue *submit_workers;
900         struct btrfs_workqueue *caching_workers;
901         struct btrfs_workqueue *readahead_workers;
902 
903         /*
904          * fixup workers take dirty pages that didn't properly go through
905          * the cow mechanism and make them safe to write.  It happens
906          * for the sys_munmap function call path
907          */
908         struct btrfs_workqueue *fixup_workers;
909         struct btrfs_workqueue *delayed_workers;
910 
911         struct task_struct *transaction_kthread;
912         struct task_struct *cleaner_kthread;
913         u32 thread_pool_size;
914 
915         struct kobject *space_info_kobj;
916 
917         u64 total_pinned;
918 
919         /* used to keep from writing metadata until there is a nice batch */
920         struct percpu_counter dirty_metadata_bytes;
921         struct percpu_counter delalloc_bytes;
922         struct percpu_counter dio_bytes;
923         s32 dirty_metadata_batch;
924         s32 delalloc_batch;
925 
926         struct list_head dirty_cowonly_roots;
927 
928         struct btrfs_fs_devices *fs_devices;
929 
930         /*
931          * The space_info list is effectively read only after initial
932          * setup.  It is populated at mount time and cleaned up after
933          * all block groups are removed.  RCU is used to protect it.
934          */
935         struct list_head space_info;
936 
937         struct btrfs_space_info *data_sinfo;
938 
939         struct reloc_control *reloc_ctl;
940 
941         /* data_alloc_cluster is only used in ssd_spread mode */
942         struct btrfs_free_cluster data_alloc_cluster;
943 
944         /* all metadata allocations go through this cluster */
945         struct btrfs_free_cluster meta_alloc_cluster;
946 
947         /* auto defrag inodes go here */
948         spinlock_t defrag_inodes_lock;
949         struct rb_root defrag_inodes;
950         atomic_t defrag_running;
951 
952         /* Used to protect avail_{data, metadata, system}_alloc_bits */
953         seqlock_t profiles_lock;
954         /*
955          * these three are in extended format (availability of single
956          * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
957          * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
958          */
959         u64 avail_data_alloc_bits;
960         u64 avail_metadata_alloc_bits;
961         u64 avail_system_alloc_bits;
962 
963         /* restriper state */
964         spinlock_t balance_lock;
965         struct mutex balance_mutex;
966         atomic_t balance_pause_req;
967         atomic_t balance_cancel_req;
968         struct btrfs_balance_control *balance_ctl;
969         wait_queue_head_t balance_wait_q;
970 
971         u32 data_chunk_allocations;
972         u32 metadata_ratio;
973 
974         void *bdev_holder;
975 
976         /* private scrub information */
977         struct mutex scrub_lock;
978         atomic_t scrubs_running;
979         atomic_t scrub_pause_req;
980         atomic_t scrubs_paused;
981         atomic_t scrub_cancel_req;
982         wait_queue_head_t scrub_pause_wait;
983         /*
984          * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
985          * running.
986          */
987         refcount_t scrub_workers_refcnt;
988         struct btrfs_workqueue *scrub_workers;
989         struct btrfs_workqueue *scrub_wr_completion_workers;
990         struct btrfs_workqueue *scrub_parity_workers;
991 
992 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
993         u32 check_integrity_print_mask;
994 #endif
995         /* is qgroup tracking in a consistent state? */
996         u64 qgroup_flags;
997 
998         /* holds configuration and tracking. Protected by qgroup_lock */
999         struct rb_root qgroup_tree;
1000         spinlock_t qgroup_lock;
1001 
1002         /*
1003          * used to avoid frequently calling ulist_alloc()/ulist_free()
1004          * when doing qgroup accounting, it must be protected by qgroup_lock.
1005          */
1006         struct ulist *qgroup_ulist;
1007 
1008         /* protect user change for quota operations */
1009         struct mutex qgroup_ioctl_lock;
1010 
1011         /* list of dirty qgroups to be written at next commit */
1012         struct list_head dirty_qgroups;
1013 
1014         /* used by qgroup for an efficient tree traversal */
1015         u64 qgroup_seq;
1016 
1017         /* qgroup rescan items */
1018         struct mutex qgroup_rescan_lock; /* protects the progress item */
1019         struct btrfs_key qgroup_rescan_progress;
1020         struct btrfs_workqueue *qgroup_rescan_workers;
1021         struct completion qgroup_rescan_completion;
1022         struct btrfs_work qgroup_rescan_work;
1023         bool qgroup_rescan_running;     /* protected by qgroup_rescan_lock */
1024 
1025         /* filesystem state */
1026         unsigned long fs_state;
1027 
1028         struct btrfs_delayed_root *delayed_root;
1029 
1030         /* readahead tree */
1031         spinlock_t reada_lock;
1032         struct radix_tree_root reada_tree;
1033 
1034         /* readahead works cnt */
1035         atomic_t reada_works_cnt;
1036 
1037         /* Extent buffer radix tree */
1038         spinlock_t buffer_lock;
1039         struct radix_tree_root buffer_radix;
1040 
1041         /* next backup root to be overwritten */
1042         int backup_root_index;
1043 
1044         /* device replace state */
1045         struct btrfs_dev_replace dev_replace;
1046 
1047         struct semaphore uuid_tree_rescan_sem;
1048 
1049         /* Used to reclaim the metadata space in the background. */
1050         struct work_struct async_reclaim_work;
1051 
1052         spinlock_t unused_bgs_lock;
1053         struct list_head unused_bgs;
1054         struct mutex unused_bg_unpin_mutex;
1055         struct mutex delete_unused_bgs_mutex;
1056 
1057         /* Cached block sizes */
1058         u32 nodesize;
1059         u32 sectorsize;
1060         u32 stripesize;
1061 
1062         /* Block groups and devices containing active swapfiles. */
1063         spinlock_t swapfile_pins_lock;
1064         struct rb_root swapfile_pins;
1065 
1066         struct crypto_shash *csum_shash;
1067 
1068         /*
1069          * Number of send operations in progress.
1070          * Updated while holding fs_info::balance_mutex.
1071          */
1072         int send_in_progress;
1073 
1074 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1075         spinlock_t ref_verify_lock;
1076         struct rb_root block_tree;
1077 #endif
1078 };
1079 
1080 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1081 {
1082         return sb->s_fs_info;
1083 }
1084 
1085 struct btrfs_subvolume_writers {
1086         struct percpu_counter   counter;
1087         wait_queue_head_t       wait;
1088 };
1089 
1090 /*
1091  * The state of btrfs root
1092  */
1093 enum {
1094         /*
1095          * btrfs_record_root_in_trans is a multi-step process, and it can race
1096          * with the balancing code.   But the race is very small, and only the
1097          * first time the root is added to each transaction.  So IN_TRANS_SETUP
1098          * is used to tell us when more checks are required
1099          */
1100         BTRFS_ROOT_IN_TRANS_SETUP,
1101         BTRFS_ROOT_REF_COWS,
1102         BTRFS_ROOT_TRACK_DIRTY,
1103         BTRFS_ROOT_IN_RADIX,
1104         BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1105         BTRFS_ROOT_DEFRAG_RUNNING,
1106         BTRFS_ROOT_FORCE_COW,
1107         BTRFS_ROOT_MULTI_LOG_TASKS,
1108         BTRFS_ROOT_DIRTY,
1109         BTRFS_ROOT_DELETING,
1110 
1111         /*
1112          * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1113          *
1114          * Set for the subvolume tree owning the reloc tree.
1115          */
1116         BTRFS_ROOT_DEAD_RELOC_TREE,
1117         /* Mark dead root stored on device whose cleanup needs to be resumed */
1118         BTRFS_ROOT_DEAD_TREE,
1119 };
1120 
1121 /*
1122  * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1123  * code. For detail check comment in fs/btrfs/qgroup.c.
1124  */
1125 struct btrfs_qgroup_swapped_blocks {
1126         spinlock_t lock;
1127         /* RM_EMPTY_ROOT() of above blocks[] */
1128         bool swapped;
1129         struct rb_root blocks[BTRFS_MAX_LEVEL];
1130 };
1131 
1132 /*
1133  * in ram representation of the tree.  extent_root is used for all allocations
1134  * and for the extent tree extent_root root.
1135  */
1136 struct btrfs_root {
1137         struct extent_buffer *node;
1138 
1139         struct extent_buffer *commit_root;
1140         struct btrfs_root *log_root;
1141         struct btrfs_root *reloc_root;
1142 
1143         unsigned long state;
1144         struct btrfs_root_item root_item;
1145         struct btrfs_key root_key;
1146         struct btrfs_fs_info *fs_info;
1147         struct extent_io_tree dirty_log_pages;
1148 
1149         struct mutex objectid_mutex;
1150 
1151         spinlock_t accounting_lock;
1152         struct btrfs_block_rsv *block_rsv;
1153 
1154         /* free ino cache stuff */
1155         struct btrfs_free_space_ctl *free_ino_ctl;
1156         enum btrfs_caching_type ino_cache_state;
1157         spinlock_t ino_cache_lock;
1158         wait_queue_head_t ino_cache_wait;
1159         struct btrfs_free_space_ctl *free_ino_pinned;
1160         u64 ino_cache_progress;
1161         struct inode *ino_cache_inode;
1162 
1163         struct mutex log_mutex;
1164         wait_queue_head_t log_writer_wait;
1165         wait_queue_head_t log_commit_wait[2];
1166         struct list_head log_ctxs[2];
1167         atomic_t log_writers;
1168         atomic_t log_commit[2];
1169         atomic_t log_batch;
1170         int log_transid;
1171         /* No matter the commit succeeds or not*/
1172         int log_transid_committed;
1173         /* Just be updated when the commit succeeds. */
1174         int last_log_commit;
1175         pid_t log_start_pid;
1176 
1177         u64 last_trans;
1178 
1179         u32 type;
1180 
1181         u64 highest_objectid;
1182 
1183         u64 defrag_trans_start;
1184         struct btrfs_key defrag_progress;
1185         struct btrfs_key defrag_max;
1186 
1187         /* the dirty list is only used by non-reference counted roots */
1188         struct list_head dirty_list;
1189 
1190         struct list_head root_list;
1191 
1192         spinlock_t log_extents_lock[2];
1193         struct list_head logged_list[2];
1194 
1195         int orphan_cleanup_state;
1196 
1197         spinlock_t inode_lock;
1198         /* red-black tree that keeps track of in-memory inodes */
1199         struct rb_root inode_tree;
1200 
1201         /*
1202          * radix tree that keeps track of delayed nodes of every inode,
1203          * protected by inode_lock
1204          */
1205         struct radix_tree_root delayed_nodes_tree;
1206         /*
1207          * right now this just gets used so that a root has its own devid
1208          * for stat.  It may be used for more later
1209          */
1210         dev_t anon_dev;
1211 
1212         spinlock_t root_item_lock;
1213         refcount_t refs;
1214 
1215         struct mutex delalloc_mutex;
1216         spinlock_t delalloc_lock;
1217         /*
1218          * all of the inodes that have delalloc bytes.  It is possible for
1219          * this list to be empty even when there is still dirty data=ordered
1220          * extents waiting to finish IO.
1221          */
1222         struct list_head delalloc_inodes;
1223         struct list_head delalloc_root;
1224         u64 nr_delalloc_inodes;
1225 
1226         struct mutex ordered_extent_mutex;
1227         /*
1228          * this is used by the balancing code to wait for all the pending
1229          * ordered extents
1230          */
1231         spinlock_t ordered_extent_lock;
1232 
1233         /*
1234          * all of the data=ordered extents pending writeback
1235          * these can span multiple transactions and basically include
1236          * every dirty data page that isn't from nodatacow
1237          */
1238         struct list_head ordered_extents;
1239         struct list_head ordered_root;
1240         u64 nr_ordered_extents;
1241 
1242         /*
1243          * Not empty if this subvolume root has gone through tree block swap
1244          * (relocation)
1245          *
1246          * Will be used by reloc_control::dirty_subvol_roots.
1247          */
1248         struct list_head reloc_dirty_list;
1249 
1250         /*
1251          * Number of currently running SEND ioctls to prevent
1252          * manipulation with the read-only status via SUBVOL_SETFLAGS
1253          */
1254         int send_in_progress;
1255         /*
1256          * Number of currently running deduplication operations that have a
1257          * destination inode belonging to this root. Protected by the lock
1258          * root_item_lock.
1259          */
1260         int dedupe_in_progress;
1261         struct btrfs_subvolume_writers *subv_writers;
1262         atomic_t will_be_snapshotted;
1263         atomic_t snapshot_force_cow;
1264 
1265         /* For qgroup metadata reserved space */
1266         spinlock_t qgroup_meta_rsv_lock;
1267         u64 qgroup_meta_rsv_pertrans;
1268         u64 qgroup_meta_rsv_prealloc;
1269 
1270         /* Number of active swapfiles */
1271         atomic_t nr_swapfiles;
1272 
1273         /* Record pairs of swapped blocks for qgroup */
1274         struct btrfs_qgroup_swapped_blocks swapped_blocks;
1275 
1276 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1277         u64 alloc_bytenr;
1278 #endif
1279 };
1280 
1281 struct btrfs_file_private {
1282         void *filldir_buf;
1283 };
1284 
1285 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1286 {
1287         return btrfs_sb(inode->i_sb)->sectorsize;
1288 }
1289 
1290 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1291 {
1292 
1293         return info->nodesize - sizeof(struct btrfs_header);
1294 }
1295 
1296 #define BTRFS_LEAF_DATA_OFFSET          offsetof(struct btrfs_leaf, items)
1297 
1298 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1299 {
1300         return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1301 }
1302 
1303 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1304 {
1305         return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1306 }
1307 
1308 #define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
1309                 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1310 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1311 {
1312         return BTRFS_MAX_ITEM_SIZE(info) -
1313                BTRFS_FILE_EXTENT_INLINE_DATA_START;
1314 }
1315 
1316 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1317 {
1318         return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1319 }
1320 
1321 /*
1322  * Flags for mount options.
1323  *
1324  * Note: don't forget to add new options to btrfs_show_options()
1325  */
1326 #define BTRFS_MOUNT_NODATASUM           (1 << 0)
1327 #define BTRFS_MOUNT_NODATACOW           (1 << 1)
1328 #define BTRFS_MOUNT_NOBARRIER           (1 << 2)
1329 #define BTRFS_MOUNT_SSD                 (1 << 3)
1330 #define BTRFS_MOUNT_DEGRADED            (1 << 4)
1331 #define BTRFS_MOUNT_COMPRESS            (1 << 5)
1332 #define BTRFS_MOUNT_NOTREELOG           (1 << 6)
1333 #define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
1334 #define BTRFS_MOUNT_SSD_SPREAD          (1 << 8)
1335 #define BTRFS_MOUNT_NOSSD               (1 << 9)
1336 #define BTRFS_MOUNT_DISCARD             (1 << 10)
1337 #define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
1338 #define BTRFS_MOUNT_SPACE_CACHE         (1 << 12)
1339 #define BTRFS_MOUNT_CLEAR_CACHE         (1 << 13)
1340 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1341 #define BTRFS_MOUNT_ENOSPC_DEBUG         (1 << 15)
1342 #define BTRFS_MOUNT_AUTO_DEFRAG         (1 << 16)
1343 #define BTRFS_MOUNT_INODE_MAP_CACHE     (1 << 17)
1344 #define BTRFS_MOUNT_USEBACKUPROOT       (1 << 18)
1345 #define BTRFS_MOUNT_SKIP_BALANCE        (1 << 19)
1346 #define BTRFS_MOUNT_CHECK_INTEGRITY     (1 << 20)
1347 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1348 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR        (1 << 22)
1349 #define BTRFS_MOUNT_RESCAN_UUID_TREE    (1 << 23)
1350 #define BTRFS_MOUNT_FRAGMENT_DATA       (1 << 24)
1351 #define BTRFS_MOUNT_FRAGMENT_METADATA   (1 << 25)
1352 #define BTRFS_MOUNT_FREE_SPACE_TREE     (1 << 26)
1353 #define BTRFS_MOUNT_NOLOGREPLAY         (1 << 27)
1354 #define BTRFS_MOUNT_REF_VERIFY          (1 << 28)
1355 
1356 #define BTRFS_DEFAULT_COMMIT_INTERVAL   (30)
1357 #define BTRFS_DEFAULT_MAX_INLINE        (2048)
1358 
1359 #define btrfs_clear_opt(o, opt)         ((o) &= ~BTRFS_MOUNT_##opt)
1360 #define btrfs_set_opt(o, opt)           ((o) |= BTRFS_MOUNT_##opt)
1361 #define btrfs_raw_test_opt(o, opt)      ((o) & BTRFS_MOUNT_##opt)
1362 #define btrfs_test_opt(fs_info, opt)    ((fs_info)->mount_opt & \
1363                                          BTRFS_MOUNT_##opt)
1364 
1365 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                  \
1366 {                                                                       \
1367         if (!btrfs_test_opt(fs_info, opt))                              \
1368                 btrfs_info(fs_info, fmt, ##args);                       \
1369         btrfs_set_opt(fs_info->mount_opt, opt);                         \
1370 }
1371 
1372 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)                \
1373 {                                                                       \
1374         if (btrfs_test_opt(fs_info, opt))                               \
1375                 btrfs_info(fs_info, fmt, ##args);                       \
1376         btrfs_clear_opt(fs_info->mount_opt, opt);                       \
1377 }
1378 
1379 #ifdef CONFIG_BTRFS_DEBUG
1380 static inline int
1381 btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1382 {
1383         struct btrfs_fs_info *fs_info = block_group->fs_info;
1384 
1385         return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1386                 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1387                (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1388                 block_group->flags &  BTRFS_BLOCK_GROUP_DATA);
1389 }
1390 #endif
1391 
1392 /*
1393  * Requests for changes that need to be done during transaction commit.
1394  *
1395  * Internal mount options that are used for special handling of the real
1396  * mount options (eg. cannot be set during remount and have to be set during
1397  * transaction commit)
1398  */
1399 
1400 #define BTRFS_PENDING_SET_INODE_MAP_CACHE       (0)
1401 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE     (1)
1402 #define BTRFS_PENDING_COMMIT                    (2)
1403 
1404 #define btrfs_test_pending(info, opt)   \
1405         test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1406 #define btrfs_set_pending(info, opt)    \
1407         set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1408 #define btrfs_clear_pending(info, opt)  \
1409         clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1410 
1411 /*
1412  * Helpers for setting pending mount option changes.
1413  *
1414  * Expects corresponding macros
1415  * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1416  */
1417 #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1418 do {                                                                   \
1419        if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1420                btrfs_info((info), fmt, ##args);                        \
1421                btrfs_set_pending((info), SET_##opt);                   \
1422                btrfs_clear_pending((info), CLEAR_##opt);               \
1423        }                                                               \
1424 } while(0)
1425 
1426 #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1427 do {                                                                   \
1428        if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1429                btrfs_info((info), fmt, ##args);                        \
1430                btrfs_set_pending((info), CLEAR_##opt);                 \
1431                btrfs_clear_pending((info), SET_##opt);                 \
1432        }                                                               \
1433 } while(0)
1434 
1435 /*
1436  * Inode flags
1437  */
1438 #define BTRFS_INODE_NODATASUM           (1 << 0)
1439 #define BTRFS_INODE_NODATACOW           (1 << 1)
1440 #define BTRFS_INODE_READONLY            (1 << 2)
1441 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
1442 #define BTRFS_INODE_PREALLOC            (1 << 4)
1443 #define BTRFS_INODE_SYNC                (1 << 5)
1444 #define BTRFS_INODE_IMMUTABLE           (1 << 6)
1445 #define BTRFS_INODE_APPEND              (1 << 7)
1446 #define BTRFS_INODE_NODUMP              (1 << 8)
1447 #define BTRFS_INODE_NOATIME             (1 << 9)
1448 #define BTRFS_INODE_DIRSYNC             (1 << 10)
1449 #define BTRFS_INODE_COMPRESS            (1 << 11)
1450 
1451 #define BTRFS_INODE_ROOT_ITEM_INIT      (1 << 31)
1452 
1453 #define BTRFS_INODE_FLAG_MASK                                           \
1454         (BTRFS_INODE_NODATASUM |                                        \
1455          BTRFS_INODE_NODATACOW |                                        \
1456          BTRFS_INODE_READONLY |                                         \
1457          BTRFS_INODE_NOCOMPRESS |                                       \
1458          BTRFS_INODE_PREALLOC |                                         \
1459          BTRFS_INODE_SYNC |                                             \
1460          BTRFS_INODE_IMMUTABLE |                                        \
1461          BTRFS_INODE_APPEND |                                           \
1462          BTRFS_INODE_NODUMP |                                           \
1463          BTRFS_INODE_NOATIME |                                          \
1464          BTRFS_INODE_DIRSYNC |                                          \
1465          BTRFS_INODE_COMPRESS |                                         \
1466          BTRFS_INODE_ROOT_ITEM_INIT)
1467 
1468 struct btrfs_map_token {
1469         const struct extent_buffer *eb;
1470         char *kaddr;
1471         unsigned long offset;
1472 };
1473 
1474 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1475                                 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1476 
1477 static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1478 {
1479         token->kaddr = NULL;
1480 }
1481 
1482 /* some macros to generate set/get functions for the struct fields.  This
1483  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1484  * one for u8:
1485  */
1486 #define le8_to_cpu(v) (v)
1487 #define cpu_to_le8(v) (v)
1488 #define __le8 u8
1489 
1490 #define read_eb_member(eb, ptr, type, member, result) (\
1491         read_extent_buffer(eb, (char *)(result),                        \
1492                            ((unsigned long)(ptr)) +                     \
1493                             offsetof(type, member),                     \
1494                            sizeof(((type *)0)->member)))
1495 
1496 #define write_eb_member(eb, ptr, type, member, result) (\
1497         write_extent_buffer(eb, (char *)(result),                       \
1498                            ((unsigned long)(ptr)) +                     \
1499                             offsetof(type, member),                     \
1500                            sizeof(((type *)0)->member)))
1501 
1502 #define DECLARE_BTRFS_SETGET_BITS(bits)                                 \
1503 u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,          \
1504                                const void *ptr, unsigned long off,      \
1505                                struct btrfs_map_token *token);          \
1506 void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,  \
1507                             unsigned long off, u##bits val,             \
1508                             struct btrfs_map_token *token);             \
1509 static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,  \
1510                                        const void *ptr,                 \
1511                                        unsigned long off)               \
1512 {                                                                       \
1513         return btrfs_get_token_##bits(eb, ptr, off, NULL);              \
1514 }                                                                       \
1515 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
1516                                     unsigned long off, u##bits val)     \
1517 {                                                                       \
1518        btrfs_set_token_##bits(eb, ptr, off, val, NULL);                 \
1519 }
1520 
1521 DECLARE_BTRFS_SETGET_BITS(8)
1522 DECLARE_BTRFS_SETGET_BITS(16)
1523 DECLARE_BTRFS_SETGET_BITS(32)
1524 DECLARE_BTRFS_SETGET_BITS(64)
1525 
1526 #define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
1527 static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
1528                                    const type *s)                       \
1529 {                                                                       \
1530         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1531         return btrfs_get_##bits(eb, s, offsetof(type, member));         \
1532 }                                                                       \
1533 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
1534                                     u##bits val)                        \
1535 {                                                                       \
1536         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1537         btrfs_set_##bits(eb, s, offsetof(type, member), val);           \
1538 }                                                                       \
1539 static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
1540                                          const type *s,                 \
1541                                          struct btrfs_map_token *token) \
1542 {                                                                       \
1543         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1544         return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1545 }                                                                       \
1546 static inline void btrfs_set_token_##name(struct extent_buffer *eb,     \
1547                                           type *s, u##bits val,         \
1548                                          struct btrfs_map_token *token) \
1549 {                                                                       \
1550         BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
1551         btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1552 }
1553 
1554 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
1555 static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
1556 {                                                                       \
1557         const type *p = page_address(eb->pages[0]);                     \
1558         u##bits res = le##bits##_to_cpu(p->member);                     \
1559         return res;                                                     \
1560 }                                                                       \
1561 static inline void btrfs_set_##name(struct extent_buffer *eb,           \
1562                                     u##bits val)                        \
1563 {                                                                       \
1564         type *p = page_address(eb->pages[0]);                           \
1565         p->member = cpu_to_le##bits(val);                               \
1566 }
1567 
1568 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
1569 static inline u##bits btrfs_##name(const type *s)                       \
1570 {                                                                       \
1571         return le##bits##_to_cpu(s->member);                            \
1572 }                                                                       \
1573 static inline void btrfs_set_##name(type *s, u##bits val)               \
1574 {                                                                       \
1575         s->member = cpu_to_le##bits(val);                               \
1576 }
1577 
1578 
1579 static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
1580                                            struct btrfs_dev_item *s)
1581 {
1582         BUILD_BUG_ON(sizeof(u64) !=
1583                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1584         return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1585                                             total_bytes));
1586 }
1587 static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
1588                                                 struct btrfs_dev_item *s,
1589                                                 u64 val)
1590 {
1591         BUILD_BUG_ON(sizeof(u64) !=
1592                      sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1593         WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1594         btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1595 }
1596 
1597 
1598 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1599 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1600 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1601 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1602 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1603                    start_offset, 64);
1604 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1605 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1606 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1607 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1608 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1609 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1610 
1611 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1612 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1613                          total_bytes, 64);
1614 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1615                          bytes_used, 64);
1616 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1617                          io_align, 32);
1618 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1619                          io_width, 32);
1620 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1621                          sector_size, 32);
1622 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1623 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1624                          dev_group, 32);
1625 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1626                          seek_speed, 8);
1627 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1628                          bandwidth, 8);
1629 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1630                          generation, 64);
1631 
1632 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1633 {
1634         return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1635 }
1636 
1637 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1638 {
1639         return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1640 }
1641 
1642 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1643 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1644 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1645 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1646 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1647 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1648 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1649 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1650 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1651 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1652 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1653 
1654 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1655 {
1656         return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1657 }
1658 
1659 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1660 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1661 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1662                          stripe_len, 64);
1663 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1664                          io_align, 32);
1665 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1666                          io_width, 32);
1667 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1668                          sector_size, 32);
1669 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1670 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1671                          num_stripes, 16);
1672 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1673                          sub_stripes, 16);
1674 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1675 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1676 
1677 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1678                                                    int nr)
1679 {
1680         unsigned long offset = (unsigned long)c;
1681         offset += offsetof(struct btrfs_chunk, stripe);
1682         offset += nr * sizeof(struct btrfs_stripe);
1683         return (struct btrfs_stripe *)offset;
1684 }
1685 
1686 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1687 {
1688         return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1689 }
1690 
1691 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1692                                          struct btrfs_chunk *c, int nr)
1693 {
1694         return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1695 }
1696 
1697 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1698                                          struct btrfs_chunk *c, int nr)
1699 {
1700         return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1701 }
1702 
1703 /* struct btrfs_block_group_item */
1704 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1705                          used, 64);
1706 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1707                          used, 64);
1708 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1709                         struct btrfs_block_group_item, chunk_objectid, 64);
1710 
1711 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1712                    struct btrfs_block_group_item, chunk_objectid, 64);
1713 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1714                    struct btrfs_block_group_item, flags, 64);
1715 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1716                         struct btrfs_block_group_item, flags, 64);
1717 
1718 /* struct btrfs_free_space_info */
1719 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1720                    extent_count, 32);
1721 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1722 
1723 /* struct btrfs_inode_ref */
1724 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1725 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1726 
1727 /* struct btrfs_inode_extref */
1728 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1729                    parent_objectid, 64);
1730 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1731                    name_len, 16);
1732 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1733 
1734 /* struct btrfs_inode_item */
1735 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1736 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1737 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1738 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1739 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1740 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1741 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1742 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1743 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1744 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1745 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1746 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1747 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1748                          generation, 64);
1749 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1750                          sequence, 64);
1751 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1752                          transid, 64);
1753 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1754 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1755                          nbytes, 64);
1756 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1757                          block_group, 64);
1758 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1759 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1760 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1761 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1762 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1763 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1764 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1765 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1766 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1767 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1768 
1769 /* struct btrfs_dev_extent */
1770 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1771                    chunk_tree, 64);
1772 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1773                    chunk_objectid, 64);
1774 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1775                    chunk_offset, 64);
1776 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1777 
1778 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1779 {
1780         unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1781         return (unsigned long)dev + ptr;
1782 }
1783 
1784 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1785 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1786                    generation, 64);
1787 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1788 
1789 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1790 
1791 
1792 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1793 
1794 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1795                                         struct btrfs_tree_block_info *item,
1796                                         struct btrfs_disk_key *key)
1797 {
1798         read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1799 }
1800 
1801 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1802                                             struct btrfs_tree_block_info *item,
1803                                             struct btrfs_disk_key *key)
1804 {
1805         write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1806 }
1807 
1808 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1809                    root, 64);
1810 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1811                    objectid, 64);
1812 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1813                    offset, 64);
1814 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1815                    count, 32);
1816 
1817 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1818                    count, 32);
1819 
1820 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1821                    type, 8);
1822 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1823                    offset, 64);
1824 
1825 static inline u32 btrfs_extent_inline_ref_size(int type)
1826 {
1827         if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1828             type == BTRFS_SHARED_BLOCK_REF_KEY)
1829                 return sizeof(struct btrfs_extent_inline_ref);
1830         if (type == BTRFS_SHARED_DATA_REF_KEY)
1831                 return sizeof(struct btrfs_shared_data_ref) +
1832                        sizeof(struct btrfs_extent_inline_ref);
1833         if (type == BTRFS_EXTENT_DATA_REF_KEY)
1834                 return sizeof(struct btrfs_extent_data_ref) +
1835                        offsetof(struct btrfs_extent_inline_ref, offset);
1836         return 0;
1837 }
1838 
1839 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1840 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1841                    generation, 64);
1842 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1843 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1844 
1845 /* struct btrfs_node */
1846 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1847 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1848 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1849                          blockptr, 64);
1850 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1851                          generation, 64);
1852 
1853 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1854 {
1855         unsigned long ptr;
1856         ptr = offsetof(struct btrfs_node, ptrs) +
1857                 sizeof(struct btrfs_key_ptr) * nr;
1858         return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1859 }
1860 
1861 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1862                                            int nr, u64 val)
1863 {
1864         unsigned long ptr;
1865         ptr = offsetof(struct btrfs_node, ptrs) +
1866                 sizeof(struct btrfs_key_ptr) * nr;
1867         btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1868 }
1869 
1870 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1871 {
1872         unsigned long ptr;
1873         ptr = offsetof(struct btrfs_node, ptrs) +
1874                 sizeof(struct btrfs_key_ptr) * nr;
1875         return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1876 }
1877 
1878 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1879                                                  int nr, u64 val)
1880 {
1881         unsigned long ptr;
1882         ptr = offsetof(struct btrfs_node, ptrs) +
1883                 sizeof(struct btrfs_key_ptr) * nr;
1884         btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1885 }
1886 
1887 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1888 {
1889         return offsetof(struct btrfs_node, ptrs) +
1890                 sizeof(struct btrfs_key_ptr) * nr;
1891 }
1892 
1893 void btrfs_node_key(const struct extent_buffer *eb,
1894                     struct btrfs_disk_key *disk_key, int nr);
1895 
1896 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1897                                       struct btrfs_disk_key *disk_key, int nr)
1898 {
1899         unsigned long ptr;
1900         ptr = btrfs_node_key_ptr_offset(nr);
1901         write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1902                        struct btrfs_key_ptr, key, disk_key);
1903 }
1904 
1905 /* struct btrfs_item */
1906 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1907 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1908 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1909 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1910 
1911 static inline unsigned long btrfs_item_nr_offset(int nr)
1912 {
1913         return offsetof(struct btrfs_leaf, items) +
1914                 sizeof(struct btrfs_item) * nr;
1915 }
1916 
1917 static inline struct btrfs_item *btrfs_item_nr(int nr)
1918 {
1919         return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1920 }
1921 
1922 static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1923                                  struct btrfs_item *item)
1924 {
1925         return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1926 }
1927 
1928 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1929 {
1930         return btrfs_item_end(eb, btrfs_item_nr(nr));
1931 }
1932 
1933 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1934 {
1935         return btrfs_item_offset(eb, btrfs_item_nr(nr));
1936 }
1937 
1938 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1939 {
1940         return btrfs_item_size(eb, btrfs_item_nr(nr));
1941 }
1942 
1943 static inline void btrfs_item_key(const struct extent_buffer *eb,
1944                            struct btrfs_disk_key *disk_key, int nr)
1945 {
1946         struct btrfs_item *item = btrfs_item_nr(nr);
1947         read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1948 }
1949 
1950 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1951                                struct btrfs_disk_key *disk_key, int nr)
1952 {
1953         struct btrfs_item *item = btrfs_item_nr(nr);
1954         write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1955 }
1956 
1957 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1958 
1959 /*
1960  * struct btrfs_root_ref
1961  */
1962 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1963 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1964 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1965 
1966 /* struct btrfs_dir_item */
1967 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1968 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1969 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1970 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1971 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1972 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1973                          data_len, 16);
1974 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1975                          name_len, 16);
1976 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1977                          transid, 64);
1978 
1979 static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
1980                                       const struct btrfs_dir_item *item,
1981                                       struct btrfs_disk_key *key)
1982 {
1983         read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1984 }
1985 
1986 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1987                                           struct btrfs_dir_item *item,
1988                                           const struct btrfs_disk_key *key)
1989 {
1990         write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1991 }
1992 
1993 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1994                    num_entries, 64);
1995 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1996                    num_bitmaps, 64);
1997 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1998                    generation, 64);
1999 
2000 static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2001                                         const struct btrfs_free_space_header *h,
2002                                         struct btrfs_disk_key *key)
2003 {
2004         read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2005 }
2006 
2007 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2008                                             struct btrfs_free_space_header *h,
2009                                             const struct btrfs_disk_key *key)
2010 {
2011         write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2012 }
2013 
2014 /* struct btrfs_disk_key */
2015 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2016                          objectid, 64);
2017 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2018 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2019 
2020 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2021                                          const struct btrfs_disk_key *disk)
2022 {
2023         cpu->offset = le64_to_cpu(disk->offset);
2024         cpu->type = disk->type;
2025         cpu->objectid = le64_to_cpu(disk->objectid);
2026 }
2027 
2028 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2029                                          const struct btrfs_key *cpu)
2030 {
2031         disk->offset = cpu_to_le64(cpu->offset);
2032         disk->type = cpu->type;
2033         disk->objectid = cpu_to_le64(cpu->objectid);
2034 }
2035 
2036 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2037                                          struct btrfs_key *key, int nr)
2038 {
2039         struct btrfs_disk_key disk_key;
2040         btrfs_node_key(eb, &disk_key, nr);
2041         btrfs_disk_key_to_cpu(key, &disk_key);
2042 }
2043 
2044 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2045                                          struct btrfs_key *key, int nr)
2046 {
2047         struct btrfs_disk_key disk_key;
2048         btrfs_item_key(eb, &disk_key, nr);
2049         btrfs_disk_key_to_cpu(key, &disk_key);
2050 }
2051 
2052 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2053                                              const struct btrfs_dir_item *item,
2054                                              struct btrfs_key *key)
2055 {
2056         struct btrfs_disk_key disk_key;
2057         btrfs_dir_item_key(eb, item, &disk_key);
2058         btrfs_disk_key_to_cpu(key, &disk_key);
2059 }
2060 
2061 static inline u8 btrfs_key_type(const struct btrfs_key *key)
2062 {
2063         return key->type;
2064 }
2065 
2066 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2067 {
2068         key->type = val;
2069 }
2070 
2071 /* struct btrfs_header */
2072 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2073 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2074                           generation, 64);
2075 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2076 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2077 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2078 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2079 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2080                          generation, 64);
2081 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2082 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2083                          nritems, 32);
2084 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2085 
2086 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2087 {
2088         return (btrfs_header_flags(eb) & flag) == flag;
2089 }
2090 
2091 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2092 {
2093         u64 flags = btrfs_header_flags(eb);
2094         btrfs_set_header_flags(eb, flags | flag);
2095 }
2096 
2097 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2098 {
2099         u64 flags = btrfs_header_flags(eb);
2100         btrfs_set_header_flags(eb, flags & ~flag);
2101 }
2102 
2103 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2104 {
2105         u64 flags = btrfs_header_flags(eb);
2106         return flags >> BTRFS_BACKREF_REV_SHIFT;
2107 }
2108 
2109 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2110                                                 int rev)
2111 {
2112         u64 flags = btrfs_header_flags(eb);
2113         flags &= ~BTRFS_BACKREF_REV_MASK;
2114         flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2115         btrfs_set_header_flags(eb, flags);
2116 }
2117 
2118 static inline unsigned long btrfs_header_fsid(void)
2119 {
2120         return offsetof(struct btrfs_header, fsid);
2121 }
2122 
2123 static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
2124 {
2125         return offsetof(struct btrfs_header, chunk_tree_uuid);
2126 }
2127 
2128 static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2129 {
2130         return btrfs_header_level(eb) == 0;
2131 }
2132 
2133 /* struct btrfs_root_item */
2134 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2135                    generation, 64);
2136 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2137 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2138 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2139 
2140 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2141                          generation, 64);
2142 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2143 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2144 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2145 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2146 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2147 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2148 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2149 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2150                          last_snapshot, 64);
2151 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2152                          generation_v2, 64);
2153 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2154                          ctransid, 64);
2155 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2156                          otransid, 64);
2157 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2158                          stransid, 64);
2159 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2160                          rtransid, 64);
2161 
2162 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2163 {
2164         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2165 }
2166 
2167 static inline bool btrfs_root_dead(const struct btrfs_root *root)
2168 {
2169         return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2170 }
2171 
2172 /* struct btrfs_root_backup */
2173 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2174                    tree_root, 64);
2175 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2176                    tree_root_gen, 64);
2177 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2178                    tree_root_level, 8);
2179 
2180 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2181                    chunk_root, 64);
2182 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2183                    chunk_root_gen, 64);
2184 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2185                    chunk_root_level, 8);
2186 
2187 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2188                    extent_root, 64);
2189 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2190                    extent_root_gen, 64);
2191 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2192                    extent_root_level, 8);
2193 
2194 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2195                    fs_root, 64);
2196 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2197                    fs_root_gen, 64);
2198 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2199                    fs_root_level, 8);
2200 
2201 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2202                    dev_root, 64);
2203 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2204                    dev_root_gen, 64);
2205 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2206                    dev_root_level, 8);
2207 
2208 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2209                    csum_root, 64);
2210 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2211                    csum_root_gen, 64);
2212 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2213                    csum_root_level, 8);
2214 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2215                    total_bytes, 64);
2216 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2217                    bytes_used, 64);
2218 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2219                    num_devices, 64);
2220 
2221 /* struct btrfs_balance_item */
2222 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2223 
2224 static inline void btrfs_balance_data(const struct extent_buffer *eb,
2225                                       const struct btrfs_balance_item *bi,
2226                                       struct btrfs_disk_balance_args *ba)
2227 {
2228         read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2229 }
2230 
2231 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2232                                   struct btrfs_balance_item *bi,
2233                                   const struct btrfs_disk_balance_args *ba)
2234 {
2235         write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2236 }
2237 
2238 static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2239                                       const struct btrfs_balance_item *bi,
2240                                       struct btrfs_disk_balance_args *ba)
2241 {
2242         read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2243 }
2244 
2245 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2246                                   struct btrfs_balance_item *bi,
2247                                   const struct btrfs_disk_balance_args *ba)
2248 {
2249         write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2250 }
2251 
2252 static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2253                                      const struct btrfs_balance_item *bi,
2254                                      struct btrfs_disk_balance_args *ba)
2255 {
2256         read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2257 }
2258 
2259 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2260                                  struct btrfs_balance_item *bi,
2261                                  const struct btrfs_disk_balance_args *ba)
2262 {
2263         write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2264 }
2265 
2266 static inline void
2267 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2268                                const struct btrfs_disk_balance_args *disk)
2269 {
2270         memset(cpu, 0, sizeof(*cpu));
2271 
2272         cpu->profiles = le64_to_cpu(disk->profiles);
2273         cpu->usage = le64_to_cpu(disk->usage);
2274         cpu->devid = le64_to_cpu(disk->devid);
2275         cpu->pstart = le64_to_cpu(disk->pstart);
2276         cpu->pend = le64_to_cpu(disk->pend);
2277         cpu->vstart = le64_to_cpu(disk->vstart);
2278         cpu->vend = le64_to_cpu(disk->vend);
2279         cpu->target = le64_to_cpu(disk->target);
2280         cpu->flags = le64_to_cpu(disk->flags);
2281         cpu->limit = le64_to_cpu(disk->limit);
2282         cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2283         cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2284 }
2285 
2286 static inline void
2287 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2288                                const struct btrfs_balance_args *cpu)
2289 {
2290         memset(disk, 0, sizeof(*disk));
2291 
2292         disk->profiles = cpu_to_le64(cpu->profiles);
2293         disk->usage = cpu_to_le64(cpu->usage);
2294         disk->devid = cpu_to_le64(cpu->devid);
2295         disk->pstart = cpu_to_le64(cpu->pstart);
2296         disk->pend = cpu_to_le64(cpu->pend);
2297         disk->vstart = cpu_to_le64(cpu->vstart);
2298         disk->vend = cpu_to_le64(cpu->vend);
2299         disk->target = cpu_to_le64(cpu->target);
2300         disk->flags = cpu_to_le64(cpu->flags);
2301         disk->limit = cpu_to_le64(cpu->limit);
2302         disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2303         disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2304 }
2305 
2306 /* struct btrfs_super_block */
2307 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2308 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2309 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2310                          generation, 64);
2311 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2312 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2313                          struct btrfs_super_block, sys_chunk_array_size, 32);
2314 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2315                          struct btrfs_super_block, chunk_root_generation, 64);
2316 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2317                          root_level, 8);
2318 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2319                          chunk_root, 64);
2320 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2321                          chunk_root_level, 8);
2322 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2323                          log_root, 64);
2324 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2325                          log_root_transid, 64);
2326 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2327                          log_root_level, 8);
2328 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2329                          total_bytes, 64);
2330 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2331                          bytes_used, 64);
2332 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2333                          sectorsize, 32);
2334 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2335                          nodesize, 32);
2336 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2337                          stripesize, 32);
2338 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2339                          root_dir_objectid, 64);
2340 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2341                          num_devices, 64);
2342 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2343                          compat_flags, 64);
2344 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2345                          compat_ro_flags, 64);
2346 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2347                          incompat_flags, 64);
2348 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2349                          csum_type, 16);
2350 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2351                          cache_generation, 64);
2352 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2353 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2354                          uuid_tree_generation, 64);
2355 
2356 static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
2357 {
2358         u16 t = btrfs_super_csum_type(s);
2359         /*
2360          * csum type is validated at mount time
2361          */
2362         return btrfs_csum_sizes[t];
2363 }
2364 
2365 static inline const char *btrfs_super_csum_name(u16 csum_type)
2366 {
2367         /* csum type is validated at mount time */
2368         return btrfs_csum_names[csum_type];
2369 }
2370 
2371 /*
2372  * The leaf data grows from end-to-front in the node.
2373  * this returns the address of the start of the last item,
2374  * which is the stop of the leaf data stack
2375  */
2376 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2377 {
2378         u32 nr = btrfs_header_nritems(leaf);
2379 
2380         if (nr == 0)
2381                 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2382         return btrfs_item_offset_nr(leaf, nr - 1);
2383 }
2384 
2385 /* struct btrfs_file_extent_item */
2386 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2387 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2388                          struct btrfs_file_extent_item, disk_bytenr, 64);
2389 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2390                          struct btrfs_file_extent_item, offset, 64);
2391 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2392                          struct btrfs_file_extent_item, generation, 64);
2393 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2394                          struct btrfs_file_extent_item, num_bytes, 64);
2395 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2396                          struct btrfs_file_extent_item, disk_num_bytes, 64);
2397 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2398                          struct btrfs_file_extent_item, compression, 8);
2399 
2400 static inline unsigned long
2401 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2402 {
2403         return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2404 }
2405 
2406 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2407 {
2408         return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2409 }
2410 
2411 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2412                    disk_bytenr, 64);
2413 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2414                    generation, 64);
2415 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2416                    disk_num_bytes, 64);
2417 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2418                   offset, 64);
2419 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2420                    num_bytes, 64);
2421 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2422                    ram_bytes, 64);
2423 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2424                    compression, 8);
2425 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2426                    encryption, 8);
2427 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2428                    other_encoding, 16);
2429 
2430 /*
2431  * this returns the number of bytes used by the item on disk, minus the
2432  * size of any extent headers.  If a file is compressed on disk, this is
2433  * the compressed size
2434  */
2435 static inline u32 btrfs_file_extent_inline_item_len(
2436                                                 const struct extent_buffer *eb,
2437                                                 struct btrfs_item *e)
2438 {
2439         return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2440 }
2441 
2442 /* btrfs_dev_stats_item */
2443 static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
2444                                         const struct btrfs_dev_stats_item *ptr,
2445                                         int index)
2446 {
2447         u64 val;
2448 
2449         read_extent_buffer(eb, &val,
2450                            offsetof(struct btrfs_dev_stats_item, values) +
2451                             ((unsigned long)ptr) + (index * sizeof(u64)),
2452                            sizeof(val));
2453         return val;
2454 }
2455 
2456 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2457                                              struct btrfs_dev_stats_item *ptr,
2458                                              int index, u64 val)
2459 {
2460         write_extent_buffer(eb, &val,
2461                             offsetof(struct btrfs_dev_stats_item, values) +
2462                              ((unsigned long)ptr) + (index * sizeof(u64)),
2463                             sizeof(val));
2464 }
2465 
2466 /* btrfs_qgroup_status_item */
2467 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2468                    generation, 64);
2469 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2470                    version, 64);
2471 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2472                    flags, 64);
2473 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2474                    rescan, 64);
2475 
2476 /* btrfs_qgroup_info_item */
2477 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2478                    generation, 64);
2479 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2480 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2481                    rfer_cmpr, 64);
2482 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2483 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2484                    excl_cmpr, 64);
2485 
2486 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2487                          struct btrfs_qgroup_info_item, generation, 64);
2488 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2489                          rfer, 64);
2490 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2491                          struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2492 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2493                          excl, 64);
2494 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2495                          struct btrfs_qgroup_info_item, excl_cmpr, 64);
2496 
2497 /* btrfs_qgroup_limit_item */
2498 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2499                    flags, 64);
2500 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2501                    max_rfer, 64);
2502 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2503                    max_excl, 64);
2504 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2505                    rsv_rfer, 64);
2506 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2507                    rsv_excl, 64);
2508 
2509 /* btrfs_dev_replace_item */
2510 BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2511                    struct btrfs_dev_replace_item, src_devid, 64);
2512 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2513                    struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2514                    64);
2515 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2516                    replace_state, 64);
2517 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2518                    time_started, 64);
2519 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2520                    time_stopped, 64);
2521 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2522                    num_write_errors, 64);
2523 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2524                    struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2525                    64);
2526 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2527                    cursor_left, 64);
2528 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2529                    cursor_right, 64);
2530 
2531 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2532                          struct btrfs_dev_replace_item, src_devid, 64);
2533 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2534                          struct btrfs_dev_replace_item,
2535                          cont_reading_from_srcdev_mode, 64);
2536 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2537                          struct btrfs_dev_replace_item, replace_state, 64);
2538 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2539                          struct btrfs_dev_replace_item, time_started, 64);
2540 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2541                          struct btrfs_dev_replace_item, time_stopped, 64);
2542 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2543                          struct btrfs_dev_replace_item, num_write_errors, 64);
2544 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2545                          struct btrfs_dev_replace_item,
2546                          num_uncorrectable_read_errors, 64);
2547 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2548                          struct btrfs_dev_replace_item, cursor_left, 64);
2549 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2550                          struct btrfs_dev_replace_item, cursor_right, 64);
2551 
2552 /* helper function to cast into the data area of the leaf. */
2553 #define btrfs_item_ptr(leaf, slot, type) \
2554         ((type *)(BTRFS_LEAF_DATA_OFFSET + \
2555         btrfs_item_offset_nr(leaf, slot)))
2556 
2557 #define btrfs_item_ptr_offset(leaf, slot) \
2558         ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2559         btrfs_item_offset_nr(leaf, slot)))
2560 
2561 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2562 {
2563         return crc32c(crc, address, length);
2564 }
2565 
2566 static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2567 {
2568         put_unaligned_le32(~crc, result);
2569 }
2570 
2571 static inline u64 btrfs_name_hash(const char *name, int len)
2572 {
2573        return crc32c((u32)~1, name, len);
2574 }
2575 
2576 /*
2577  * Figure the key offset of an extended inode ref
2578  */
2579 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2580                                    int len)
2581 {
2582        return (u64) crc32c(parent_objectid, name, len);
2583 }
2584 
2585 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2586 {
2587         return mapping_gfp_constraint(mapping, ~__GFP_FS);
2588 }
2589 
2590 /* extent-tree.c */
2591 
2592 enum btrfs_inline_ref_type {
2593         BTRFS_REF_TYPE_INVALID,
2594         BTRFS_REF_TYPE_BLOCK,
2595         BTRFS_REF_TYPE_DATA,
2596         BTRFS_REF_TYPE_ANY,
2597 };
2598 
2599 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2600                                      struct btrfs_extent_inline_ref *iref,
2601                                      enum btrfs_inline_ref_type is_data);
2602 
2603 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2604 
2605 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2606                                                  unsigned num_items)
2607 {
2608         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2609 }
2610 
2611 /*
2612  * Doing a truncate won't result in new nodes or leaves, just what we need for
2613  * COW.
2614  */
2615 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2616                                                  unsigned num_items)
2617 {
2618         return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2619 }
2620 
2621 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2622                                          const u64 start);
2623 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2624 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2625 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2626 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2627 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2628 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2629                            unsigned long count);
2630 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2631                                   struct btrfs_delayed_ref_root *delayed_refs,
2632                                   struct btrfs_delayed_ref_head *head);
2633 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2634 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2635                              struct btrfs_fs_info *fs_info, u64 bytenr,
2636                              u64 offset, int metadata, u64 *refs, u64 *flags);
2637 int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2638                      u64 bytenr, u64 num, int reserved);
2639 int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2640                                     u64 bytenr, u64 num_bytes);
2641 int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2642 int btrfs_cross_ref_exist(struct btrfs_root *root,
2643                           u64 objectid, u64 offset, u64 bytenr);
2644 struct btrfs_block_group_cache *btrfs_lookup_block_group(
2645                                                  struct btrfs_fs_info *info,
2646                                                  u64 bytenr);
2647 void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2648 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2649 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2650                                              struct btrfs_root *root,
2651                                              u64 parent, u64 root_objectid,
2652                                              const struct btrfs_disk_key *key,
2653                                              int level, u64 hint,
2654                                              u64 empty_size);
2655 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2656                            struct btrfs_root *root,
2657                            struct extent_buffer *buf,
2658                            u64 parent, int last_ref);
2659 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2660                                      struct btrfs_root *root, u64 owner,
2661                                      u64 offset, u64 ram_bytes,
2662                                      struct btrfs_key *ins);
2663 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2664                                    u64 root_objectid, u64 owner, u64 offset,
2665                                    struct btrfs_key *ins);
2666 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2667                          u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2668                          struct btrfs_key *ins, int is_data, int delalloc);
2669 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2670                   struct extent_buffer *buf, int full_backref);
2671 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2672                   struct extent_buffer *buf, int full_backref);
2673 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2674                                 u64 bytenr, u64 num_bytes, u64 flags,
2675                                 int level, int is_data);
2676 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2677 
2678 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2679                                u64 start, u64 len, int delalloc);
2680 int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2681                                        u64 start, u64 len);
2682 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
2683 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2684 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2685                          struct btrfs_ref *generic_ref);
2686 
2687 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
2688 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans);
2689 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans);
2690 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2691 int btrfs_free_block_groups(struct btrfs_fs_info *info);
2692 int btrfs_read_block_groups(struct btrfs_fs_info *info);
2693 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2694 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2695                            u64 bytes_used, u64 type, u64 chunk_offset,
2696                            u64 size);
2697 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2698                                 struct btrfs_fs_info *fs_info,
2699                                 const u64 chunk_offset);
2700 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2701                              u64 group_start, struct extent_map *em);
2702 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2703 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2704 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2705 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
2706 u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info);
2707 u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info);
2708 u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info);
2709 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2710 
2711 enum btrfs_reserve_flush_enum {
2712         /* If we are in the transaction, we can't flush anything.*/
2713         BTRFS_RESERVE_NO_FLUSH,
2714         /*
2715          * Flushing delalloc may cause deadlock somewhere, in this
2716          * case, use FLUSH LIMIT
2717          */
2718         BTRFS_RESERVE_FLUSH_LIMIT,
2719         BTRFS_RESERVE_FLUSH_ALL,
2720 };
2721 
2722 enum btrfs_flush_state {
2723         FLUSH_DELAYED_ITEMS_NR  =       1,
2724         FLUSH_DELAYED_ITEMS     =       2,
2725         FLUSH_DELAYED_REFS_NR   =       3,
2726         FLUSH_DELAYED_REFS      =       4,
2727         FLUSH_DELALLOC          =       5,
2728         FLUSH_DELALLOC_WAIT     =       6,
2729         ALLOC_CHUNK             =       7,
2730         ALLOC_CHUNK_FORCE       =       8,
2731         COMMIT_TRANS            =       9,
2732 };
2733 
2734 /*
2735  * control flags for do_chunk_alloc's force field
2736  * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk
2737  * if we really need one.
2738  *
2739  * CHUNK_ALLOC_LIMITED means to only try and allocate one
2740  * if we have very few chunks already allocated.  This is
2741  * used as part of the clustering code to help make sure
2742  * we have a good pool of storage to cluster in, without
2743  * filling the FS with empty chunks
2744  *
2745  * CHUNK_ALLOC_FORCE means it must try to allocate one
2746  *
2747  */
2748 enum btrfs_chunk_alloc_enum {
2749         CHUNK_ALLOC_NO_FORCE,
2750         CHUNK_ALLOC_LIMITED,
2751         CHUNK_ALLOC_FORCE,
2752 };
2753 
2754 int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags,
2755                       enum btrfs_chunk_alloc_enum force);
2756 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2757                                      struct btrfs_block_rsv *rsv,
2758                                      int nitems, bool use_global_rsv);
2759 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2760                                       struct btrfs_block_rsv *rsv);
2761 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2762 
2763 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2764 int btrfs_inc_block_group_ro(struct btrfs_block_group_cache *cache);
2765 void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2766 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2767 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2768 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2769                                    u64 start, u64 end);
2770 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2771                          u64 num_bytes, u64 *actual_bytes);
2772 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type);
2773 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2774 
2775 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2776 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2777                                          struct btrfs_fs_info *fs_info);
2778 int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2779 void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2780 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2781 void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type);
2782 u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2783                        u64 start, u64 end);
2784 void btrfs_mark_bg_unused(struct btrfs_block_group_cache *bg);
2785 
2786 /* ctree.c */
2787 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2788                      int level, int *slot);
2789 int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2790 int btrfs_previous_item(struct btrfs_root *root,
2791                         struct btrfs_path *path, u64 min_objectid,
2792                         int type);
2793 int btrfs_previous_extent_item(struct btrfs_root *root,
2794                         struct btrfs_path *path, u64 min_objectid);
2795 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2796                              struct btrfs_path *path,
2797                              const struct btrfs_key *new_key);
2798 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2799 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2800 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root);
2801 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2802                         struct btrfs_key *key, int lowest_level,
2803                         u64 min_trans);
2804 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2805                          struct btrfs_path *path,
2806                          u64 min_trans);
2807 enum btrfs_compare_tree_result {
2808         BTRFS_COMPARE_TREE_NEW,
2809         BTRFS_COMPARE_TREE_DELETED,
2810         BTRFS_COMPARE_TREE_CHANGED,
2811         BTRFS_COMPARE_TREE_SAME,
2812 };
2813 typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
2814                                   struct btrfs_path *right_path,
2815                                   struct btrfs_key *key,
2816                                   enum btrfs_compare_tree_result result,
2817                                   void *ctx);
2818 int btrfs_compare_trees(struct btrfs_root *left_root,
2819                         struct btrfs_root *right_root,
2820                         btrfs_changed_cb_t cb, void *ctx);
2821 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2822                     struct btrfs_root *root, struct extent_buffer *buf,
2823                     struct extent_buffer *parent, int parent_slot,
2824                     struct extent_buffer **cow_ret);
2825 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2826                       struct btrfs_root *root,
2827                       struct extent_buffer *buf,
2828                       struct extent_buffer **cow_ret, u64 new_root_objectid);
2829 int btrfs_block_can_be_shared(struct btrfs_root *root,
2830                               struct extent_buffer *buf);
2831 void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2832 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2833 int btrfs_split_item(struct btrfs_trans_handle *trans,
2834                      struct btrfs_root *root,
2835                      struct btrfs_path *path,
2836                      const struct btrfs_key *new_key,
2837                      unsigned long split_offset);
2838 int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2839                          struct btrfs_root *root,
2840                          struct btrfs_path *path,
2841                          const struct btrfs_key *new_key);
2842 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2843                 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2844 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2845                       const struct btrfs_key *key, struct btrfs_path *p,
2846                       int ins_len, int cow);
2847 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2848                           struct btrfs_path *p, u64 time_seq);
2849 int btrfs_search_slot_for_read(struct btrfs_root *root,
2850                                const struct btrfs_key *key,
2851                                struct btrfs_path *p, int find_higher,
2852                                int return_any);
2853 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2854                        struct btrfs_root *root, struct extent_buffer *parent,
2855                        int start_slot, u64 *last_ret,
2856                        struct btrfs_key *progress);
2857 void btrfs_release_path(struct btrfs_path *p);
2858 struct btrfs_path *btrfs_alloc_path(void);
2859 void btrfs_free_path(struct btrfs_path *p);
2860 void btrfs_set_path_blocking(struct btrfs_path *p);
2861 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2862 
2863 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2864                    struct btrfs_path *path, int slot, int nr);
2865 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2866                                  struct btrfs_root *root,
2867                                  struct btrfs_path *path)
2868 {
2869         return btrfs_del_items(trans, root, path, path->slots[0], 1);
2870 }
2871 
2872 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2873                             const struct btrfs_key *cpu_key, u32 *data_size,
2874                             u32 total_data, u32 total_size, int nr);
2875 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2876                       const struct btrfs_key *key, void *data, u32 data_size);
2877 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2878                              struct btrfs_root *root,
2879                              struct btrfs_path *path,
2880                              const struct btrfs_key *cpu_key, u32 *data_size,
2881                              int nr);
2882 
2883 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2884                                           struct btrfs_root *root,
2885                                           struct btrfs_path *path,
2886                                           const struct btrfs_key *key,
2887                                           u32 data_size)
2888 {
2889         return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2890 }
2891 
2892 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2893 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2894 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2895                         u64 time_seq);
2896 static inline int btrfs_next_old_item(struct btrfs_root *root,
2897                                       struct btrfs_path *p, u64 time_seq)
2898 {
2899         ++p->slots[0];
2900         if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2901                 return btrfs_next_old_leaf(root, p, time_seq);
2902         return 0;
2903 }
2904 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2905 {
2906         return btrfs_next_old_item(root, p, 0);
2907 }
2908 int btrfs_leaf_free_space(struct extent_buffer *leaf);
2909 int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2910                                      struct btrfs_block_rsv *block_rsv,
2911                                      int update_ref, int for_reloc);
2912 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2913                         struct btrfs_root *root,
2914                         struct extent_buffer *node,
2915                         struct extent_buffer *parent);
2916 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2917 {
2918         /*
2919          * Do it this way so we only ever do one test_bit in the normal case.
2920          */
2921         if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2922                 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2923                         return 2;
2924                 return 1;
2925         }
2926         return 0;
2927 }
2928 
2929 /*
2930  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2931  * anything except sleeping. This function is used to check the status of
2932  * the fs.
2933  */
2934 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2935 {
2936         return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info);
2937 }
2938 
2939 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2940 {
2941         kfree(fs_info->balance_ctl);
2942         kfree(fs_info->delayed_root);
2943         kfree(fs_info->extent_root);
2944         kfree(fs_info->tree_root);
2945         kfree(fs_info->chunk_root);
2946         kfree(fs_info->dev_root);
2947         kfree(fs_info->csum_root);
2948         kfree(fs_info->quota_root);
2949         kfree(fs_info->uuid_root);
2950         kfree(fs_info->free_space_root);
2951         kfree(fs_info->super_copy);
2952         kfree(fs_info->super_for_commit);
2953         kvfree(fs_info);
2954 }
2955 
2956 /* tree mod log functions from ctree.c */
2957 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2958                            struct seq_list *elem);
2959 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2960                             struct seq_list *elem);
2961 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2962 
2963 /* root-item.c */
2964 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2965                        u64 ref_id, u64 dirid, u64 sequence, const char *name,
2966                        int name_len);
2967 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2968                        u64 ref_id, u64 dirid, u64 *sequence, const char *name,
2969                        int name_len);
2970 int btrfs_del_root(struct btrfs_trans_handle *trans,
2971                    const struct btrfs_key *key);
2972 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2973                       const struct btrfs_key *key,
2974                       struct btrfs_root_item *item);
2975 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2976                                    struct btrfs_root *root,
2977                                    struct btrfs_key *key,
2978                                    struct btrfs_root_item *item);
2979 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
2980                     struct btrfs_path *path, struct btrfs_root_item *root_item,
2981                     struct btrfs_key *root_key);
2982 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
2983 void btrfs_set_root_node(struct btrfs_root_item *item,
2984                          struct extent_buffer *node);
2985 void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2986 void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2987                              struct btrfs_root *root);
2988 
2989 /* uuid-tree.c */
2990 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
2991                         u64 subid);
2992 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
2993                         u64 subid);
2994 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
2995                             int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
2996                                               u64));
2997 
2998 /* dir-item.c */
2999 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3000                           const char *name, int name_len);
3001 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 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 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3034                                                  struct btrfs_path *path,
3035                                                  const char *name,
3036                                                  int name_len);
3037 
3038 /* orphan.c */
3039 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3040                              struct btrfs_root *root, u64 offset);
3041 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3042                           struct btrfs_root *root, u64 offset);
3043 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3044 
3045 /* inode-item.c */
3046 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3047                            struct btrfs_root *root,
3048                            const char *name, int name_len,
3049                            u64 inode_objectid, u64 ref_objectid, u64 index);
3050 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3051                            struct btrfs_root *root,
3052                            const char *name, int name_len,
3053                            u64 inode_objectid, u64 ref_objectid, u64 *index);
3054 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3055                              struct btrfs_root *root,
3056                              struct btrfs_path *path, u64 objectid);
3057 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3058                        *root, struct btrfs_path *path,
3059                        struct btrfs_key *location, int mod);
3060 
3061 struct btrfs_inode_extref *
3062 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3063                           struct btrfs_root *root,
3064                           struct btrfs_path *path,
3065                           const char *name, int name_len,
3066                           u64 inode_objectid, u64 ref_objectid, int ins_len,
3067                           int cow);
3068 
3069 int btrfs_find_name_in_backref(struct extent_buffer *leaf, int slot,
3070                                const char *name,
3071                                int name_len, struct btrfs_inode_ref **ref_ret);
3072 int btrfs_find_name_in_ext_backref(struct extent_buffer *leaf, int slot,
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 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio,
3082                                    u8 *dst);
3083 blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3084                               u64 logical_offset);
3085 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3086                              struct btrfs_root *root,
3087                              u64 objectid, u64 pos,
3088                              u64 disk_offset, u64 disk_num_bytes,
3089                              u64 num_bytes, u64 offset, u64 ram_bytes,
3090                              u8 compression, u8 encryption, u16 other_encoding);
3091 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3092                              struct btrfs_root *root,
3093                              struct btrfs_path *path, u64 objectid,
3094                              u64 bytenr, int mod);
3095 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3096                            struct btrfs_root *root,
3097                            struct btrfs_ordered_sum *sums);
3098 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3099                        u64 file_start, int contig);
3100 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3101                              struct list_head *list, int search_commit);
3102 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3103                                      const struct btrfs_path *path,
3104                                      struct btrfs_file_extent_item *fi,
3105                                      const bool new_inline,
3106                                      struct extent_map *em);
3107 
3108 /* inode.c */
3109 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3110                                            u64 start, u64 len);
3111 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3112                               u64 *orig_start, u64 *orig_block_len,
3113                               u64 *ram_bytes);
3114 
3115 void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3116                                 struct btrfs_inode *inode);
3117 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3118 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3119 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3120                        struct btrfs_root *root,
3121                        struct btrfs_inode *dir, struct btrfs_inode *inode,
3122                        const char *name, int name_len);
3123 int btrfs_add_link(struct btrfs_trans_handle *trans,
3124                    struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3125                    const char *name, int name_len, int add_backref, u64 index);
3126 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3127 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3128                         int front);
3129 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3130                                struct btrfs_root *root,
3131                                struct inode *inode, u64 new_size,
3132                                u32 min_type);
3133 
3134 int btrfs_start_delalloc_snapshot(struct btrfs_root *root);
3135 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
3136 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3137                               unsigned int extra_bits,
3138                               struct extent_state **cached_state, int dedupe);
3139 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3140                              struct btrfs_root *new_root,
3141                              struct btrfs_root *parent_root,
3142                              u64 new_dirid);
3143  void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3144                                unsigned *bits);
3145 void btrfs_clear_delalloc_extent(struct inode *inode,
3146                                  struct extent_state *state, unsigned *bits);
3147 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3148                                  struct extent_state *other);
3149 void btrfs_split_delalloc_extent(struct inode *inode,
3150                                  struct extent_state *orig, u64 split);
3151 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
3152                              unsigned long bio_flags);
3153 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end);
3154 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3155 int btrfs_readpage(struct file *file, struct page *page);
3156 void btrfs_evict_inode(struct inode *inode);
3157 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3158 struct inode *btrfs_alloc_inode(struct super_block *sb);
3159 void btrfs_destroy_inode(struct inode *inode);
3160 void btrfs_free_inode(struct inode *inode);
3161 int btrfs_drop_inode(struct inode *inode);
3162 int __init btrfs_init_cachep(void);
3163 void __cold btrfs_destroy_cachep(void);
3164 struct inode *btrfs_iget_path(struct super_block *s, struct btrfs_key *location,
3165                               struct btrfs_root *root, int *new,
3166                               struct btrfs_path *path);
3167 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3168                          struct btrfs_root *root, int *was_new);
3169 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3170                                     struct page *page, size_t pg_offset,
3171                                     u64 start, u64 end, int create);
3172 int btrfs_update_inode(struct btrfs_trans_handle *trans,
3173                               struct btrfs_root *root,
3174                               struct inode *inode);
3175 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3176                                 struct btrfs_root *root, struct inode *inode);
3177 int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3178                 struct btrfs_inode *inode);
3179 int btrfs_orphan_cleanup(struct btrfs_root *root);
3180 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3181 void btrfs_add_delayed_iput(struct inode *inode);
3182 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3183 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3184 int btrfs_prealloc_file_range(struct inode *inode, int mode,
3185                               u64 start, u64 num_bytes, u64 min_size,
3186                               loff_t actual_len, u64 *alloc_hint);
3187 int btrfs_prealloc_file_range_trans(struct inode *inode,
3188                                     struct btrfs_trans_handle *trans, int mode,
3189                                     u64 start, u64 num_bytes, u64 min_size,
3190                                     loff_t actual_len, u64 *alloc_hint);
3191 int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page,
3192                 u64 start, u64 end, int *page_started, unsigned long *nr_written,
3193                 struct writeback_control *wbc);
3194 int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end);
3195 void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
3196                                           u64 end, int uptodate);
3197 extern const struct dentry_operations btrfs_dentry_operations;
3198 
3199 /* ioctl.c */
3200 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3201 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3202 int btrfs_ioctl_get_supported_features(void __user *arg);
3203 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3204 int btrfs_is_empty_uuid(u8 *uuid);
3205 int btrfs_defrag_file(struct inode *inode, struct file *file,
3206                       struct btrfs_ioctl_defrag_range_args *range,
3207                       u64 newer_than, unsigned long max_pages);
3208 void btrfs_get_block_group_info(struct list_head *groups_list,
3209                                 struct btrfs_ioctl_space_info *space);
3210 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3211                                struct btrfs_ioctl_balance_args *bargs);
3212 
3213 /* file.c */
3214 int __init btrfs_auto_defrag_init(void);
3215 void __cold btrfs_auto_defrag_exit(void);
3216 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3217                            struct btrfs_inode *inode);
3218 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3219 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3220 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3221 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3222                              int skip_pinned);
3223 extern const struct file_operations btrfs_file_operations;
3224 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3225                          struct btrfs_root *root, struct inode *inode,
3226                          struct btrfs_path *path, u64 start, u64 end,
3227                          u64 *drop_end, int drop_cache,
3228                          int replace_extent,
3229                          u32 extent_item_size,
3230                          int *key_inserted);
3231 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3232                        struct btrfs_root *root, struct inode *inode, u64 start,
3233                        u64 end, int drop_cache);
3234 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3235                               struct btrfs_inode *inode, u64 start, u64 end);
3236 int btrfs_release_file(struct inode *inode, struct file *file);
3237 int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3238                       size_t num_pages, loff_t pos, size_t write_bytes,
3239                       struct extent_state **cached);
3240 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3241 loff_t btrfs_remap_file_range(struct file *file_in, loff_t pos_in,
3242                               struct file *file_out, loff_t pos_out,
3243                               loff_t len, unsigned int remap_flags);
3244 
3245 /* tree-defrag.c */
3246 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3247                         struct btrfs_root *root);
3248 
3249 /* sysfs.c */
3250 int __init btrfs_init_sysfs(void);
3251 void __cold btrfs_exit_sysfs(void);
3252 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3253 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3254 
3255 /* super.c */
3256 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3257                         unsigned long new_flags);
3258 int btrfs_sync_fs(struct super_block *sb, int wait);
3259 
3260 static inline __printf(2, 3) __cold
3261 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3262 {
3263 }
3264 
3265 #ifdef CONFIG_PRINTK
3266 __printf(2, 3)
3267 __cold
3268 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3269 #else
3270 #define btrfs_printk(fs_info, fmt, args...) \
3271         btrfs_no_printk(fs_info, fmt, ##args)
3272 #endif
3273 
3274 #define btrfs_emerg(fs_info, fmt, args...) \
3275         btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3276 #define btrfs_alert(fs_info, fmt, args...) \
3277         btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3278 #define btrfs_crit(fs_info, fmt, args...) \
3279         btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3280 #define btrfs_err(fs_info, fmt, args...) \
3281         btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3282 #define btrfs_warn(fs_info, fmt, args...) \
3283         btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3284 #define btrfs_notice(fs_info, fmt, args...) \
3285         btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3286 #define btrfs_info(fs_info, fmt, args...) \
3287         btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3288 
3289 /*
3290  * Wrappers that use printk_in_rcu
3291  */
3292 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3293         btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3294 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3295         btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3296 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3297         btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3298 #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3299         btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3300 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3301         btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3302 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3303         btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3304 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3305         btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3306 
3307 /*
3308  * Wrappers that use a ratelimited printk_in_rcu
3309  */
3310 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3311         btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3312 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3313         btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3314 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3315         btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3316 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3317         btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3318 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3319         btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3320 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3321         btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3322 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3323         btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3324 
3325 /*
3326  * Wrappers that use a ratelimited printk
3327  */
3328 #define btrfs_emerg_rl(fs_info, fmt, args...) \
3329         btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3330 #define btrfs_alert_rl(fs_info, fmt, args...) \
3331         btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3332 #define btrfs_crit_rl(fs_info, fmt, args...) \
3333         btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3334 #define btrfs_err_rl(fs_info, fmt, args...) \
3335         btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3336 #define btrfs_warn_rl(fs_info, fmt, args...) \
3337         btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3338 #define btrfs_notice_rl(fs_info, fmt, args...) \
3339         btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3340 #define btrfs_info_rl(fs_info, fmt, args...) \
3341         btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3342 
3343 #if defined(CONFIG_DYNAMIC_DEBUG)
3344 #define btrfs_debug(fs_info, fmt, args...)                              \
3345         _dynamic_func_call_no_desc(fmt, btrfs_printk,                   \
3346                                    fs_info, KERN_DEBUG fmt, ##args)
3347 #define btrfs_debug_in_rcu(fs_info, fmt, args...)                       \
3348         _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu,            \
3349                                    fs_info, KERN_DEBUG fmt, ##args)
3350 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)                    \
3351         _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu,         \
3352                                    fs_info, KERN_DEBUG fmt, ##args)
3353 #define btrfs_debug_rl(fs_info, fmt, args...)                           \
3354         _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited,       \
3355                                    fs_info, KERN_DEBUG fmt, ##args)
3356 #elif defined(DEBUG)
3357 #define btrfs_debug(fs_info, fmt, args...) \
3358         btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3359 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3360         btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3361 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3362         btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3363 #define btrfs_debug_rl(fs_info, fmt, args...) \
3364         btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3365 #else
3366 #define btrfs_debug(fs_info, fmt, args...) \
3367         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3368 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3369         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3370 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3371         btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3372 #define btrfs_debug_rl(fs_info, fmt, args...) \
3373         btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3374 #endif
3375 
3376 #define btrfs_printk_in_rcu(fs_info, fmt, args...)      \
3377 do {                                                    \
3378         rcu_read_lock();                                \
3379         btrfs_printk(fs_info, fmt, ##args);             \
3380         rcu_read_unlock();                              \
3381 } while (0)
3382 
3383 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...)   \
3384 do {                                                    \
3385         rcu_read_lock();                                \
3386         btrfs_no_printk(fs_info, fmt, ##args);          \
3387         rcu_read_unlock();                              \
3388 } while (0)
3389 
3390 #define btrfs_printk_ratelimited(fs_info, fmt, args...)         \
3391 do {                                                            \
3392         static DEFINE_RATELIMIT_STATE(_rs,                      \
3393                 DEFAULT_RATELIMIT_INTERVAL,                     \
3394                 DEFAULT_RATELIMIT_BURST);                       \
3395         if (__ratelimit(&_rs))                                  \
3396                 btrfs_printk(fs_info, fmt, ##args);             \
3397 } while (0)
3398 
3399 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)           \
3400 do {                                                            \
3401         rcu_read_lock();                                        \
3402         btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
3403         rcu_read_unlock();                                      \
3404 } while (0)
3405 
3406 __cold
3407 static inline void assfail(const char *expr, const char *file, int line)
3408 {
3409         if (IS_ENABLED(CONFIG_BTRFS_ASSERT)) {
3410                 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3411                 BUG();
3412         }
3413 }
3414 
3415 #define ASSERT(expr)    \
3416         (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3417 
3418 /*
3419  * Use that for functions that are conditionally exported for sanity tests but
3420  * otherwise static
3421  */
3422 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3423 #define EXPORT_FOR_TESTS static
3424 #else
3425 #define EXPORT_FOR_TESTS
3426 #endif
3427 
3428 __cold
3429 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3430 {
3431         btrfs_err(fs_info,
3432 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3433 }
3434 
3435 __printf(5, 6)
3436 __cold
3437 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3438                      unsigned int line, int errno, const char *fmt, ...);
3439 
3440 const char *btrfs_decode_error(int errno);
3441 
3442 __cold
3443 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3444                                const char *function,
3445                                unsigned int line, int errno);
3446 
3447 /*
3448  * Call btrfs_abort_transaction as early as possible when an error condition is
3449  * detected, that way the exact line number is reported.
3450  */
3451 #define btrfs_abort_transaction(trans, errno)           \
3452 do {                                                            \
3453         /* Report first abort since mount */                    \
3454         if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,     \
3455                         &((trans)->fs_info->fs_state))) {       \
3456                 if ((errno) != -EIO) {                          \
3457                         WARN(1, KERN_DEBUG                              \
3458                         "BTRFS: Transaction aborted (error %d)\n",      \
3459                         (errno));                                       \
3460                 } else {                                                \
3461                         btrfs_debug((trans)->fs_info,                   \
3462                                     "Transaction aborted (error %d)", \
3463                                   (errno));                     \
3464                 }                                               \
3465         }                                                       \
3466         __btrfs_abort_transaction((trans), __func__,            \
3467                                   __LINE__, (errno));           \
3468 } while (0)
3469 
3470 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)             \
3471 do {                                                            \
3472         __btrfs_handle_fs_error((fs_info), __func__, __LINE__,  \
3473                           (errno), fmt, ##args);                \
3474 } while (0)
3475 
3476 __printf(5, 6)
3477 __cold
3478 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3479                    unsigned int line, int errno, const char *fmt, ...);
3480 /*
3481  * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3482  * will panic().  Otherwise we BUG() here.
3483  */
3484 #define btrfs_panic(fs_info, errno, fmt, args...)                       \
3485 do {                                                                    \
3486         __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3487         BUG();                                                          \
3488 } while (0)
3489 
3490 
3491 /* compatibility and incompatibility defines */
3492 
3493 #define btrfs_set_fs_incompat(__fs_info, opt) \
3494         __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3495                                 #opt)
3496 
3497 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3498                                            u64 flag, const char* name)
3499 {
3500         struct btrfs_super_block *disk_super;
3501         u64 features;
3502 
3503         disk_super = fs_info->super_copy;
3504         features = btrfs_super_incompat_flags(disk_super);
3505         if (!(features & flag)) {
3506                 spin_lock(&fs_info->super_lock);
3507                 features = btrfs_super_incompat_flags(disk_super);
3508                 if (!(features & flag)) {
3509                         features |= flag;
3510                         btrfs_set_super_incompat_flags(disk_super, features);
3511                         btrfs_info(fs_info,
3512                                 "setting incompat feature flag for %s (0x%llx)",
3513                                 name, flag);
3514                 }
3515                 spin_unlock(&fs_info->super_lock);
3516         }
3517 }
3518 
3519 #define btrfs_clear_fs_incompat(__fs_info, opt) \
3520         __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3521                                   #opt)
3522 
3523 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3524                                              u64 flag, const char* name)
3525 {
3526         struct btrfs_super_block *disk_super;
3527         u64 features;
3528 
3529         disk_super = fs_info->super_copy;
3530         features = btrfs_super_incompat_flags(disk_super);
3531         if (features & flag) {
3532                 spin_lock(&fs_info->super_lock);
3533                 features = btrfs_super_incompat_flags(disk_super);
3534                 if (features & flag) {
3535                         features &= ~flag;
3536                         btrfs_set_super_incompat_flags(disk_super, features);
3537                         btrfs_info(fs_info,
3538                                 "clearing incompat feature flag for %s (0x%llx)",
3539                                 name, flag);
3540                 }
3541                 spin_unlock(&fs_info->super_lock);
3542         }
3543 }
3544 
3545 #define btrfs_fs_incompat(fs_info, opt) \
3546         __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3547 
3548 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3549 {
3550         struct btrfs_super_block *disk_super;
3551         disk_super = fs_info->super_copy;
3552         return !!(btrfs_super_incompat_flags(disk_super) & flag);
3553 }
3554 
3555 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3556         __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3557                                  #opt)
3558 
3559 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3560                                             u64 flag, const char *name)
3561 {
3562         struct btrfs_super_block *disk_super;
3563         u64 features;
3564 
3565         disk_super = fs_info->super_copy;
3566         features = btrfs_super_compat_ro_flags(disk_super);
3567         if (!(features & flag)) {
3568                 spin_lock(&fs_info->super_lock);
3569                 features = btrfs_super_compat_ro_flags(disk_super);
3570                 if (!(features & flag)) {
3571                         features |= flag;
3572                         btrfs_set_super_compat_ro_flags(disk_super, features);
3573                         btrfs_info(fs_info,
3574                                 "setting compat-ro feature flag for %s (0x%llx)",
3575                                 name, flag);
3576                 }
3577                 spin_unlock(&fs_info->super_lock);
3578         }
3579 }
3580 
3581 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3582         __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3583                                    #opt)
3584 
3585 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3586                                               u64 flag, const char *name)
3587 {
3588         struct btrfs_super_block *disk_super;
3589         u64 features;
3590 
3591         disk_super = fs_info->super_copy;
3592         features = btrfs_super_compat_ro_flags(disk_super);
3593         if (features & flag) {
3594                 spin_lock(&fs_info->super_lock);
3595                 features = btrfs_super_compat_ro_flags(disk_super);
3596                 if (features & flag) {
3597                         features &= ~flag;
3598                         btrfs_set_super_compat_ro_flags(disk_super, features);
3599                         btrfs_info(fs_info,
3600                                 "clearing compat-ro feature flag for %s (0x%llx)",
3601                                 name, flag);
3602                 }
3603                 spin_unlock(&fs_info->super_lock);
3604         }
3605 }
3606 
3607 #define btrfs_fs_compat_ro(fs_info, opt) \
3608         __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3609 
3610 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3611 {
3612         struct btrfs_super_block *disk_super;
3613         disk_super = fs_info->super_copy;
3614         return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3615 }
3616 
3617 /* acl.c */
3618 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3619 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3620 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3621 int btrfs_init_acl(struct btrfs_trans_handle *trans,
3622                    struct inode *inode, struct inode *dir);
3623 #else
3624 #define btrfs_get_acl NULL
3625 #define btrfs_set_acl NULL
3626 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3627                                  struct inode *inode, struct inode *dir)
3628 {
3629         return 0;
3630 }
3631 #endif
3632 
3633 /* relocation.c */
3634 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3635 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3636                           struct btrfs_root *root);
3637 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3638                             struct btrfs_root *root);
3639 int btrfs_recover_relocation(struct btrfs_root *root);
3640 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3641 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3642                           struct btrfs_root *root, struct extent_buffer *buf,
3643                           struct extent_buffer *cow);
3644 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3645                               u64 *bytes_to_reserve);
3646 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3647                               struct btrfs_pending_snapshot *pending);
3648 
3649 /* scrub.c */
3650 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3651                     u64 end, struct btrfs_scrub_progress *progress,
3652                     int readonly, int is_dev_replace);
3653 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3654 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3655 int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3656 int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3657 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3658                          struct btrfs_scrub_progress *progress);
3659 static inline void btrfs_init_full_stripe_locks_tree(
3660                         struct btrfs_full_stripe_locks_tree *locks_root)
3661 {
3662         locks_root->root = RB_ROOT;
3663         mutex_init(&locks_root->lock);
3664 }
3665 
3666 /* dev-replace.c */
3667 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3668 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3669 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3670 
3671 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3672 {
3673         btrfs_bio_counter_sub(fs_info, 1);
3674 }
3675 
3676 /* reada.c */
3677 struct reada_control {
3678         struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
3679         struct btrfs_key        key_start;
3680         struct btrfs_key        key_end;        /* exclusive */
3681         atomic_t                elems;
3682         struct kref             refcnt;
3683         wait_queue_head_t       wait;
3684 };
3685 struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3686                               struct btrfs_key *start, struct btrfs_key *end);
3687 int btrfs_reada_wait(void *handle);
3688 void btrfs_reada_detach(void *handle);
3689 int btree_readahead_hook(struct extent_buffer *eb, int err);
3690 
3691 static inline int is_fstree(u64 rootid)
3692 {
3693         if (rootid == BTRFS_FS_TREE_OBJECTID ||
3694             ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3695               !btrfs_qgroup_level(rootid)))
3696                 return 1;
3697         return 0;
3698 }
3699 
3700 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3701 {
3702         return signal_pending(current);
3703 }
3704 
3705 #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
3706 
3707 /* Sanity test specific functions */
3708 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3709 void btrfs_test_inode_set_ops(struct inode *inode);
3710 void btrfs_test_destroy_inode(struct inode *inode);
3711 
3712 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3713 {
3714         return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3715 }
3716 #else
3717 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3718 {
3719         return 0;
3720 }
3721 #endif
3722 
3723 static inline void cond_wake_up(struct wait_queue_head *wq)
3724 {
3725         /*
3726          * This implies a full smp_mb barrier, see comments for
3727          * waitqueue_active why.
3728          */
3729         if (wq_has_sleeper(wq))
3730                 wake_up(wq);
3731 }
3732 
3733 static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
3734 {
3735         /*
3736          * Special case for conditional wakeup where the barrier required for
3737          * waitqueue_active is implied by some of the preceding code. Eg. one
3738          * of such atomic operations (atomic_dec_and_return, ...), or a
3739          * unlock/lock sequence, etc.
3740          */
3741         if (waitqueue_active(wq))
3742                 wake_up(wq);
3743 }
3744 
3745 #endif
3746 

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