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

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