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

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