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

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

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