xref: /openbmc/linux/fs/btrfs/ctree.h (revision 83869019c74cc2d01c96a3be2463a4eebe362224)
1  /* SPDX-License-Identifier: GPL-2.0 */
2  /*
3   * Copyright (C) 2007 Oracle.  All rights reserved.
4   */
5  
6  #ifndef BTRFS_CTREE_H
7  #define BTRFS_CTREE_H
8  
9  #include <linux/mm.h>
10  #include <linux/sched/signal.h>
11  #include <linux/highmem.h>
12  #include <linux/fs.h>
13  #include <linux/rwsem.h>
14  #include <linux/semaphore.h>
15  #include <linux/completion.h>
16  #include <linux/backing-dev.h>
17  #include <linux/wait.h>
18  #include <linux/slab.h>
19  #include <trace/events/btrfs.h>
20  #include <asm/unaligned.h>
21  #include <linux/pagemap.h>
22  #include <linux/btrfs.h>
23  #include <linux/btrfs_tree.h>
24  #include <linux/workqueue.h>
25  #include <linux/security.h>
26  #include <linux/sizes.h>
27  #include <linux/dynamic_debug.h>
28  #include <linux/refcount.h>
29  #include <linux/crc32c.h>
30  #include <linux/iomap.h>
31  #include "extent-io-tree.h"
32  #include "extent_io.h"
33  #include "extent_map.h"
34  #include "async-thread.h"
35  #include "block-rsv.h"
36  #include "locking.h"
37  
38  struct btrfs_trans_handle;
39  struct btrfs_transaction;
40  struct btrfs_pending_snapshot;
41  struct btrfs_delayed_ref_root;
42  struct btrfs_space_info;
43  struct btrfs_block_group;
44  extern struct kmem_cache *btrfs_trans_handle_cachep;
45  extern struct kmem_cache *btrfs_bit_radix_cachep;
46  extern struct kmem_cache *btrfs_path_cachep;
47  extern struct kmem_cache *btrfs_free_space_cachep;
48  extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
49  struct btrfs_ordered_sum;
50  struct btrfs_ref;
51  struct btrfs_bio;
52  
53  #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
54  
55  /*
56   * Maximum number of mirrors that can be available for all profiles counting
57   * the target device of dev-replace as one. During an active device replace
58   * procedure, the target device of the copy operation is a mirror for the
59   * filesystem data as well that can be used to read data in order to repair
60   * read errors on other disks.
61   *
62   * Current value is derived from RAID1C4 with 4 copies.
63   */
64  #define BTRFS_MAX_MIRRORS (4 + 1)
65  
66  #define BTRFS_MAX_LEVEL 8
67  
68  #define BTRFS_OLDEST_GENERATION	0ULL
69  
70  /*
71   * we can actually store much bigger names, but lets not confuse the rest
72   * of linux
73   */
74  #define BTRFS_NAME_LEN 255
75  
76  /*
77   * Theoretical limit is larger, but we keep this down to a sane
78   * value. That should limit greatly the possibility of collisions on
79   * inode ref items.
80   */
81  #define BTRFS_LINK_MAX 65535U
82  
83  #define BTRFS_EMPTY_DIR_SIZE 0
84  
85  /* ioprio of readahead is set to idle */
86  #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
87  
88  #define BTRFS_DIRTY_METADATA_THRESH	SZ_32M
89  
90  /*
91   * Use large batch size to reduce overhead of metadata updates.  On the reader
92   * side, we only read it when we are close to ENOSPC and the read overhead is
93   * mostly related to the number of CPUs, so it is OK to use arbitrary large
94   * value here.
95   */
96  #define BTRFS_TOTAL_BYTES_PINNED_BATCH	SZ_128M
97  
98  #define BTRFS_MAX_EXTENT_SIZE SZ_128M
99  
100  /*
101   * Deltas are an effective way to populate global statistics.  Give macro names
102   * to make it clear what we're doing.  An example is discard_extents in
103   * btrfs_free_space_ctl.
104   */
105  #define BTRFS_STAT_NR_ENTRIES	2
106  #define BTRFS_STAT_CURR		0
107  #define BTRFS_STAT_PREV		1
108  
109  /*
110   * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
111   */
112  static inline u32 count_max_extents(u64 size)
113  {
114  	return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
115  }
116  
117  static inline unsigned long btrfs_chunk_item_size(int num_stripes)
118  {
119  	BUG_ON(num_stripes == 0);
120  	return sizeof(struct btrfs_chunk) +
121  		sizeof(struct btrfs_stripe) * (num_stripes - 1);
122  }
123  
124  /*
125   * Runtime (in-memory) states of filesystem
126   */
127  enum {
128  	/* Global indicator of serious filesystem errors */
129  	BTRFS_FS_STATE_ERROR,
130  	/*
131  	 * Filesystem is being remounted, allow to skip some operations, like
132  	 * defrag
133  	 */
134  	BTRFS_FS_STATE_REMOUNTING,
135  	/* Filesystem in RO mode */
136  	BTRFS_FS_STATE_RO,
137  	/* Track if a transaction abort has been reported on this filesystem */
138  	BTRFS_FS_STATE_TRANS_ABORTED,
139  	/*
140  	 * Bio operations should be blocked on this filesystem because a source
141  	 * or target device is being destroyed as part of a device replace
142  	 */
143  	BTRFS_FS_STATE_DEV_REPLACING,
144  	/* The btrfs_fs_info created for self-tests */
145  	BTRFS_FS_STATE_DUMMY_FS_INFO,
146  };
147  
148  #define BTRFS_BACKREF_REV_MAX		256
149  #define BTRFS_BACKREF_REV_SHIFT		56
150  #define BTRFS_BACKREF_REV_MASK		(((u64)BTRFS_BACKREF_REV_MAX - 1) << \
151  					 BTRFS_BACKREF_REV_SHIFT)
152  
153  #define BTRFS_OLD_BACKREF_REV		0
154  #define BTRFS_MIXED_BACKREF_REV		1
155  
156  /*
157   * every tree block (leaf or node) starts with this header.
158   */
159  struct btrfs_header {
160  	/* these first four must match the super block */
161  	u8 csum[BTRFS_CSUM_SIZE];
162  	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
163  	__le64 bytenr; /* which block this node is supposed to live in */
164  	__le64 flags;
165  
166  	/* allowed to be different from the super from here on down */
167  	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
168  	__le64 generation;
169  	__le64 owner;
170  	__le32 nritems;
171  	u8 level;
172  } __attribute__ ((__packed__));
173  
174  /*
175   * this is a very generous portion of the super block, giving us
176   * room to translate 14 chunks with 3 stripes each.
177   */
178  #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
179  
180  /*
181   * just in case we somehow lose the roots and are not able to mount,
182   * we store an array of the roots from previous transactions
183   * in the super.
184   */
185  #define BTRFS_NUM_BACKUP_ROOTS 4
186  struct btrfs_root_backup {
187  	__le64 tree_root;
188  	__le64 tree_root_gen;
189  
190  	__le64 chunk_root;
191  	__le64 chunk_root_gen;
192  
193  	__le64 extent_root;
194  	__le64 extent_root_gen;
195  
196  	__le64 fs_root;
197  	__le64 fs_root_gen;
198  
199  	__le64 dev_root;
200  	__le64 dev_root_gen;
201  
202  	__le64 csum_root;
203  	__le64 csum_root_gen;
204  
205  	__le64 total_bytes;
206  	__le64 bytes_used;
207  	__le64 num_devices;
208  	/* future */
209  	__le64 unused_64[4];
210  
211  	u8 tree_root_level;
212  	u8 chunk_root_level;
213  	u8 extent_root_level;
214  	u8 fs_root_level;
215  	u8 dev_root_level;
216  	u8 csum_root_level;
217  	/* future and to align */
218  	u8 unused_8[10];
219  } __attribute__ ((__packed__));
220  
221  #define BTRFS_SUPER_INFO_OFFSET			SZ_64K
222  #define BTRFS_SUPER_INFO_SIZE			4096
223  
224  /*
225   * the super block basically lists the main trees of the FS
226   * it currently lacks any block count etc etc
227   */
228  struct btrfs_super_block {
229  	/* the first 4 fields must match struct btrfs_header */
230  	u8 csum[BTRFS_CSUM_SIZE];
231  	/* FS specific UUID, visible to user */
232  	u8 fsid[BTRFS_FSID_SIZE];
233  	__le64 bytenr; /* this block number */
234  	__le64 flags;
235  
236  	/* allowed to be different from the btrfs_header from here own down */
237  	__le64 magic;
238  	__le64 generation;
239  	__le64 root;
240  	__le64 chunk_root;
241  	__le64 log_root;
242  
243  	/* this will help find the new super based on the log root */
244  	__le64 log_root_transid;
245  	__le64 total_bytes;
246  	__le64 bytes_used;
247  	__le64 root_dir_objectid;
248  	__le64 num_devices;
249  	__le32 sectorsize;
250  	__le32 nodesize;
251  	__le32 __unused_leafsize;
252  	__le32 stripesize;
253  	__le32 sys_chunk_array_size;
254  	__le64 chunk_root_generation;
255  	__le64 compat_flags;
256  	__le64 compat_ro_flags;
257  	__le64 incompat_flags;
258  	__le16 csum_type;
259  	u8 root_level;
260  	u8 chunk_root_level;
261  	u8 log_root_level;
262  	struct btrfs_dev_item dev_item;
263  
264  	char label[BTRFS_LABEL_SIZE];
265  
266  	__le64 cache_generation;
267  	__le64 uuid_tree_generation;
268  
269  	/* the UUID written into btree blocks */
270  	u8 metadata_uuid[BTRFS_FSID_SIZE];
271  
272  	/* future expansion */
273  	__le64 reserved[28];
274  	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
275  	struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
276  
277  	/* Padded to 4096 bytes */
278  	u8 padding[565];
279  } __attribute__ ((__packed__));
280  static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE);
281  
282  /*
283   * Compat flags that we support.  If any incompat flags are set other than the
284   * ones specified below then we will fail to mount
285   */
286  #define BTRFS_FEATURE_COMPAT_SUPP		0ULL
287  #define BTRFS_FEATURE_COMPAT_SAFE_SET		0ULL
288  #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR		0ULL
289  
290  #define BTRFS_FEATURE_COMPAT_RO_SUPP			\
291  	(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |	\
292  	 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
293  	 BTRFS_FEATURE_COMPAT_RO_VERITY)
294  
295  #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET	0ULL
296  #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR	0ULL
297  
298  #define BTRFS_FEATURE_INCOMPAT_SUPP			\
299  	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |		\
300  	 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |	\
301  	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
302  	 BTRFS_FEATURE_INCOMPAT_BIG_METADATA |		\
303  	 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |		\
304  	 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |		\
305  	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
306  	 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
307  	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
308  	 BTRFS_FEATURE_INCOMPAT_NO_HOLES	|	\
309  	 BTRFS_FEATURE_INCOMPAT_METADATA_UUID	|	\
310  	 BTRFS_FEATURE_INCOMPAT_RAID1C34	|	\
311  	 BTRFS_FEATURE_INCOMPAT_ZONED)
312  
313  #define BTRFS_FEATURE_INCOMPAT_SAFE_SET			\
314  	(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
315  #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR		0ULL
316  
317  /*
318   * A leaf is full of items. offset and size tell us where to find
319   * the item in the leaf (relative to the start of the data area)
320   */
321  struct btrfs_item {
322  	struct btrfs_disk_key key;
323  	__le32 offset;
324  	__le32 size;
325  } __attribute__ ((__packed__));
326  
327  /*
328   * leaves have an item area and a data area:
329   * [item0, item1....itemN] [free space] [dataN...data1, data0]
330   *
331   * The data is separate from the items to get the keys closer together
332   * during searches.
333   */
334  struct btrfs_leaf {
335  	struct btrfs_header header;
336  	struct btrfs_item items[];
337  } __attribute__ ((__packed__));
338  
339  /*
340   * all non-leaf blocks are nodes, they hold only keys and pointers to
341   * other blocks
342   */
343  struct btrfs_key_ptr {
344  	struct btrfs_disk_key key;
345  	__le64 blockptr;
346  	__le64 generation;
347  } __attribute__ ((__packed__));
348  
349  struct btrfs_node {
350  	struct btrfs_header header;
351  	struct btrfs_key_ptr ptrs[];
352  } __attribute__ ((__packed__));
353  
354  /* Read ahead values for struct btrfs_path.reada */
355  enum {
356  	READA_NONE,
357  	READA_BACK,
358  	READA_FORWARD,
359  	/*
360  	 * Similar to READA_FORWARD but unlike it:
361  	 *
362  	 * 1) It will trigger readahead even for leaves that are not close to
363  	 *    each other on disk;
364  	 * 2) It also triggers readahead for nodes;
365  	 * 3) During a search, even when a node or leaf is already in memory, it
366  	 *    will still trigger readahead for other nodes and leaves that follow
367  	 *    it.
368  	 *
369  	 * This is meant to be used only when we know we are iterating over the
370  	 * entire tree or a very large part of it.
371  	 */
372  	READA_FORWARD_ALWAYS,
373  };
374  
375  /*
376   * btrfs_paths remember the path taken from the root down to the leaf.
377   * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
378   * to any other levels that are present.
379   *
380   * The slots array records the index of the item or block pointer
381   * used while walking the tree.
382   */
383  struct btrfs_path {
384  	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
385  	int slots[BTRFS_MAX_LEVEL];
386  	/* if there is real range locking, this locks field will change */
387  	u8 locks[BTRFS_MAX_LEVEL];
388  	u8 reada;
389  	/* keep some upper locks as we walk down */
390  	u8 lowest_level;
391  
392  	/*
393  	 * set by btrfs_split_item, tells search_slot to keep all locks
394  	 * and to force calls to keep space in the nodes
395  	 */
396  	unsigned int search_for_split:1;
397  	unsigned int keep_locks:1;
398  	unsigned int skip_locking:1;
399  	unsigned int search_commit_root:1;
400  	unsigned int need_commit_sem:1;
401  	unsigned int skip_release_on_error:1;
402  	/*
403  	 * Indicate that new item (btrfs_search_slot) is extending already
404  	 * existing item and ins_len contains only the data size and not item
405  	 * header (ie. sizeof(struct btrfs_item) is not included).
406  	 */
407  	unsigned int search_for_extension:1;
408  };
409  #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
410  					sizeof(struct btrfs_item))
411  struct btrfs_dev_replace {
412  	u64 replace_state;	/* see #define above */
413  	time64_t time_started;	/* seconds since 1-Jan-1970 */
414  	time64_t time_stopped;	/* seconds since 1-Jan-1970 */
415  	atomic64_t num_write_errors;
416  	atomic64_t num_uncorrectable_read_errors;
417  
418  	u64 cursor_left;
419  	u64 committed_cursor_left;
420  	u64 cursor_left_last_write_of_item;
421  	u64 cursor_right;
422  
423  	u64 cont_reading_from_srcdev_mode;	/* see #define above */
424  
425  	int is_valid;
426  	int item_needs_writeback;
427  	struct btrfs_device *srcdev;
428  	struct btrfs_device *tgtdev;
429  
430  	struct mutex lock_finishing_cancel_unmount;
431  	struct rw_semaphore rwsem;
432  
433  	struct btrfs_scrub_progress scrub_progress;
434  
435  	struct percpu_counter bio_counter;
436  	wait_queue_head_t replace_wait;
437  };
438  
439  /*
440   * free clusters are used to claim free space in relatively large chunks,
441   * allowing us to do less seeky writes. They are used for all metadata
442   * allocations. In ssd_spread mode they are also used for data allocations.
443   */
444  struct btrfs_free_cluster {
445  	spinlock_t lock;
446  	spinlock_t refill_lock;
447  	struct rb_root root;
448  
449  	/* largest extent in this cluster */
450  	u64 max_size;
451  
452  	/* first extent starting offset */
453  	u64 window_start;
454  
455  	/* We did a full search and couldn't create a cluster */
456  	bool fragmented;
457  
458  	struct btrfs_block_group *block_group;
459  	/*
460  	 * when a cluster is allocated from a block group, we put the
461  	 * cluster onto a list in the block group so that it can
462  	 * be freed before the block group is freed.
463  	 */
464  	struct list_head block_group_list;
465  };
466  
467  enum btrfs_caching_type {
468  	BTRFS_CACHE_NO,
469  	BTRFS_CACHE_STARTED,
470  	BTRFS_CACHE_FAST,
471  	BTRFS_CACHE_FINISHED,
472  	BTRFS_CACHE_ERROR,
473  };
474  
475  /*
476   * Tree to record all locked full stripes of a RAID5/6 block group
477   */
478  struct btrfs_full_stripe_locks_tree {
479  	struct rb_root root;
480  	struct mutex lock;
481  };
482  
483  /* Discard control. */
484  /*
485   * Async discard uses multiple lists to differentiate the discard filter
486   * parameters.  Index 0 is for completely free block groups where we need to
487   * ensure the entire block group is trimmed without being lossy.  Indices
488   * afterwards represent monotonically decreasing discard filter sizes to
489   * prioritize what should be discarded next.
490   */
491  #define BTRFS_NR_DISCARD_LISTS		3
492  #define BTRFS_DISCARD_INDEX_UNUSED	0
493  #define BTRFS_DISCARD_INDEX_START	1
494  
495  struct btrfs_discard_ctl {
496  	struct workqueue_struct *discard_workers;
497  	struct delayed_work work;
498  	spinlock_t lock;
499  	struct btrfs_block_group *block_group;
500  	struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
501  	u64 prev_discard;
502  	u64 prev_discard_time;
503  	atomic_t discardable_extents;
504  	atomic64_t discardable_bytes;
505  	u64 max_discard_size;
506  	u64 delay_ms;
507  	u32 iops_limit;
508  	u32 kbps_limit;
509  	u64 discard_extent_bytes;
510  	u64 discard_bitmap_bytes;
511  	atomic64_t discard_bytes_saved;
512  };
513  
514  enum btrfs_orphan_cleanup_state {
515  	ORPHAN_CLEANUP_STARTED	= 1,
516  	ORPHAN_CLEANUP_DONE	= 2,
517  };
518  
519  void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
520  
521  /* fs_info */
522  struct reloc_control;
523  struct btrfs_device;
524  struct btrfs_fs_devices;
525  struct btrfs_balance_control;
526  struct btrfs_delayed_root;
527  
528  /*
529   * Block group or device which contains an active swapfile. Used for preventing
530   * unsafe operations while a swapfile is active.
531   *
532   * These are sorted on (ptr, inode) (note that a block group or device can
533   * contain more than one swapfile). We compare the pointer values because we
534   * don't actually care what the object is, we just need a quick check whether
535   * the object exists in the rbtree.
536   */
537  struct btrfs_swapfile_pin {
538  	struct rb_node node;
539  	void *ptr;
540  	struct inode *inode;
541  	/*
542  	 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
543  	 * points to a struct btrfs_device.
544  	 */
545  	bool is_block_group;
546  	/*
547  	 * Only used when 'is_block_group' is true and it is the number of
548  	 * extents used by a swapfile for this block group ('ptr' field).
549  	 */
550  	int bg_extent_count;
551  };
552  
553  bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
554  
555  enum {
556  	BTRFS_FS_BARRIER,
557  	BTRFS_FS_CLOSING_START,
558  	BTRFS_FS_CLOSING_DONE,
559  	BTRFS_FS_LOG_RECOVERING,
560  	BTRFS_FS_OPEN,
561  	BTRFS_FS_QUOTA_ENABLED,
562  	BTRFS_FS_UPDATE_UUID_TREE_GEN,
563  	BTRFS_FS_CREATING_FREE_SPACE_TREE,
564  	BTRFS_FS_BTREE_ERR,
565  	BTRFS_FS_LOG1_ERR,
566  	BTRFS_FS_LOG2_ERR,
567  	BTRFS_FS_QUOTA_OVERRIDE,
568  	/* Used to record internally whether fs has been frozen */
569  	BTRFS_FS_FROZEN,
570  	/*
571  	 * Indicate that balance has been set up from the ioctl and is in the
572  	 * main phase. The fs_info::balance_ctl is initialized.
573  	 */
574  	BTRFS_FS_BALANCE_RUNNING,
575  
576  	/*
577  	 * Indicate that relocation of a chunk has started, it's set per chunk
578  	 * and is toggled between chunks.
579  	 * Set, tested and cleared while holding fs_info::send_reloc_lock.
580  	 */
581  	BTRFS_FS_RELOC_RUNNING,
582  
583  	/* Indicate that the cleaner thread is awake and doing something. */
584  	BTRFS_FS_CLEANER_RUNNING,
585  
586  	/*
587  	 * The checksumming has an optimized version and is considered fast,
588  	 * so we don't need to offload checksums to workqueues.
589  	 */
590  	BTRFS_FS_CSUM_IMPL_FAST,
591  
592  	/* Indicate that the discard workqueue can service discards. */
593  	BTRFS_FS_DISCARD_RUNNING,
594  
595  	/* Indicate that we need to cleanup space cache v1 */
596  	BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
597  
598  	/* Indicate that we can't trust the free space tree for caching yet */
599  	BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
600  
601  	/* Indicate whether there are any tree modification log users */
602  	BTRFS_FS_TREE_MOD_LOG_USERS,
603  
604  #if BITS_PER_LONG == 32
605  	/* Indicate if we have error/warn message printed on 32bit systems */
606  	BTRFS_FS_32BIT_ERROR,
607  	BTRFS_FS_32BIT_WARN,
608  #endif
609  };
610  
611  /*
612   * Exclusive operations (device replace, resize, device add/remove, balance)
613   */
614  enum btrfs_exclusive_operation {
615  	BTRFS_EXCLOP_NONE,
616  	BTRFS_EXCLOP_BALANCE,
617  	BTRFS_EXCLOP_DEV_ADD,
618  	BTRFS_EXCLOP_DEV_REMOVE,
619  	BTRFS_EXCLOP_DEV_REPLACE,
620  	BTRFS_EXCLOP_RESIZE,
621  	BTRFS_EXCLOP_SWAP_ACTIVATE,
622  };
623  
624  struct btrfs_fs_info {
625  	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
626  	unsigned long flags;
627  	struct btrfs_root *extent_root;
628  	struct btrfs_root *tree_root;
629  	struct btrfs_root *chunk_root;
630  	struct btrfs_root *dev_root;
631  	struct btrfs_root *fs_root;
632  	struct btrfs_root *csum_root;
633  	struct btrfs_root *quota_root;
634  	struct btrfs_root *uuid_root;
635  	struct btrfs_root *free_space_root;
636  	struct btrfs_root *data_reloc_root;
637  
638  	/* the log root tree is a directory of all the other log roots */
639  	struct btrfs_root *log_root_tree;
640  
641  	spinlock_t fs_roots_radix_lock;
642  	struct radix_tree_root fs_roots_radix;
643  
644  	/* block group cache stuff */
645  	spinlock_t block_group_cache_lock;
646  	u64 first_logical_byte;
647  	struct rb_root block_group_cache_tree;
648  
649  	/* keep track of unallocated space */
650  	atomic64_t free_chunk_space;
651  
652  	/* Track ranges which are used by log trees blocks/logged data extents */
653  	struct extent_io_tree excluded_extents;
654  
655  	/* logical->physical extent mapping */
656  	struct extent_map_tree mapping_tree;
657  
658  	/*
659  	 * block reservation for extent, checksum, root tree and
660  	 * delayed dir index item
661  	 */
662  	struct btrfs_block_rsv global_block_rsv;
663  	/* block reservation for metadata operations */
664  	struct btrfs_block_rsv trans_block_rsv;
665  	/* block reservation for chunk tree */
666  	struct btrfs_block_rsv chunk_block_rsv;
667  	/* block reservation for delayed operations */
668  	struct btrfs_block_rsv delayed_block_rsv;
669  	/* block reservation for delayed refs */
670  	struct btrfs_block_rsv delayed_refs_rsv;
671  
672  	struct btrfs_block_rsv empty_block_rsv;
673  
674  	u64 generation;
675  	u64 last_trans_committed;
676  	u64 avg_delayed_ref_runtime;
677  
678  	/*
679  	 * this is updated to the current trans every time a full commit
680  	 * is required instead of the faster short fsync log commits
681  	 */
682  	u64 last_trans_log_full_commit;
683  	unsigned long mount_opt;
684  	/*
685  	 * Track requests for actions that need to be done during transaction
686  	 * commit (like for some mount options).
687  	 */
688  	unsigned long pending_changes;
689  	unsigned long compress_type:4;
690  	unsigned int compress_level;
691  	u32 commit_interval;
692  	/*
693  	 * It is a suggestive number, the read side is safe even it gets a
694  	 * wrong number because we will write out the data into a regular
695  	 * extent. The write side(mount/remount) is under ->s_umount lock,
696  	 * so it is also safe.
697  	 */
698  	u64 max_inline;
699  
700  	struct btrfs_transaction *running_transaction;
701  	wait_queue_head_t transaction_throttle;
702  	wait_queue_head_t transaction_wait;
703  	wait_queue_head_t transaction_blocked_wait;
704  	wait_queue_head_t async_submit_wait;
705  
706  	/*
707  	 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
708  	 * when they are updated.
709  	 *
710  	 * Because we do not clear the flags for ever, so we needn't use
711  	 * the lock on the read side.
712  	 *
713  	 * We also needn't use the lock when we mount the fs, because
714  	 * there is no other task which will update the flag.
715  	 */
716  	spinlock_t super_lock;
717  	struct btrfs_super_block *super_copy;
718  	struct btrfs_super_block *super_for_commit;
719  	struct super_block *sb;
720  	struct inode *btree_inode;
721  	struct mutex tree_log_mutex;
722  	struct mutex transaction_kthread_mutex;
723  	struct mutex cleaner_mutex;
724  	struct mutex chunk_mutex;
725  
726  	/*
727  	 * this is taken to make sure we don't set block groups ro after
728  	 * the free space cache has been allocated on them
729  	 */
730  	struct mutex ro_block_group_mutex;
731  
732  	/* this is used during read/modify/write to make sure
733  	 * no two ios are trying to mod the same stripe at the same
734  	 * time
735  	 */
736  	struct btrfs_stripe_hash_table *stripe_hash_table;
737  
738  	/*
739  	 * this protects the ordered operations list only while we are
740  	 * processing all of the entries on it.  This way we make
741  	 * sure the commit code doesn't find the list temporarily empty
742  	 * because another function happens to be doing non-waiting preflush
743  	 * before jumping into the main commit.
744  	 */
745  	struct mutex ordered_operations_mutex;
746  
747  	struct rw_semaphore commit_root_sem;
748  
749  	struct rw_semaphore cleanup_work_sem;
750  
751  	struct rw_semaphore subvol_sem;
752  
753  	spinlock_t trans_lock;
754  	/*
755  	 * the reloc mutex goes with the trans lock, it is taken
756  	 * during commit to protect us from the relocation code
757  	 */
758  	struct mutex reloc_mutex;
759  
760  	struct list_head trans_list;
761  	struct list_head dead_roots;
762  	struct list_head caching_block_groups;
763  
764  	spinlock_t delayed_iput_lock;
765  	struct list_head delayed_iputs;
766  	atomic_t nr_delayed_iputs;
767  	wait_queue_head_t delayed_iputs_wait;
768  
769  	atomic64_t tree_mod_seq;
770  
771  	/* this protects tree_mod_log and tree_mod_seq_list */
772  	rwlock_t tree_mod_log_lock;
773  	struct rb_root tree_mod_log;
774  	struct list_head tree_mod_seq_list;
775  
776  	atomic_t async_delalloc_pages;
777  
778  	/*
779  	 * this is used to protect the following list -- ordered_roots.
780  	 */
781  	spinlock_t ordered_root_lock;
782  
783  	/*
784  	 * all fs/file tree roots in which there are data=ordered extents
785  	 * pending writeback are added into this list.
786  	 *
787  	 * these can span multiple transactions and basically include
788  	 * every dirty data page that isn't from nodatacow
789  	 */
790  	struct list_head ordered_roots;
791  
792  	struct mutex delalloc_root_mutex;
793  	spinlock_t delalloc_root_lock;
794  	/* all fs/file tree roots that have delalloc inodes. */
795  	struct list_head delalloc_roots;
796  
797  	/*
798  	 * there is a pool of worker threads for checksumming during writes
799  	 * and a pool for checksumming after reads.  This is because readers
800  	 * can run with FS locks held, and the writers may be waiting for
801  	 * those locks.  We don't want ordering in the pending list to cause
802  	 * deadlocks, and so the two are serviced separately.
803  	 *
804  	 * A third pool does submit_bio to avoid deadlocking with the other
805  	 * two
806  	 */
807  	struct btrfs_workqueue *workers;
808  	struct btrfs_workqueue *delalloc_workers;
809  	struct btrfs_workqueue *flush_workers;
810  	struct btrfs_workqueue *endio_workers;
811  	struct btrfs_workqueue *endio_meta_workers;
812  	struct btrfs_workqueue *endio_raid56_workers;
813  	struct btrfs_workqueue *rmw_workers;
814  	struct btrfs_workqueue *endio_meta_write_workers;
815  	struct btrfs_workqueue *endio_write_workers;
816  	struct btrfs_workqueue *endio_freespace_worker;
817  	struct btrfs_workqueue *caching_workers;
818  	struct btrfs_workqueue *readahead_workers;
819  
820  	/*
821  	 * fixup workers take dirty pages that didn't properly go through
822  	 * the cow mechanism and make them safe to write.  It happens
823  	 * for the sys_munmap function call path
824  	 */
825  	struct btrfs_workqueue *fixup_workers;
826  	struct btrfs_workqueue *delayed_workers;
827  
828  	struct task_struct *transaction_kthread;
829  	struct task_struct *cleaner_kthread;
830  	u32 thread_pool_size;
831  
832  	struct kobject *space_info_kobj;
833  	struct kobject *qgroups_kobj;
834  
835  	/* used to keep from writing metadata until there is a nice batch */
836  	struct percpu_counter dirty_metadata_bytes;
837  	struct percpu_counter delalloc_bytes;
838  	struct percpu_counter ordered_bytes;
839  	s32 dirty_metadata_batch;
840  	s32 delalloc_batch;
841  
842  	struct list_head dirty_cowonly_roots;
843  
844  	struct btrfs_fs_devices *fs_devices;
845  
846  	/*
847  	 * The space_info list is effectively read only after initial
848  	 * setup.  It is populated at mount time and cleaned up after
849  	 * all block groups are removed.  RCU is used to protect it.
850  	 */
851  	struct list_head space_info;
852  
853  	struct btrfs_space_info *data_sinfo;
854  
855  	struct reloc_control *reloc_ctl;
856  
857  	/* data_alloc_cluster is only used in ssd_spread mode */
858  	struct btrfs_free_cluster data_alloc_cluster;
859  
860  	/* all metadata allocations go through this cluster */
861  	struct btrfs_free_cluster meta_alloc_cluster;
862  
863  	/* auto defrag inodes go here */
864  	spinlock_t defrag_inodes_lock;
865  	struct rb_root defrag_inodes;
866  	atomic_t defrag_running;
867  
868  	/* Used to protect avail_{data, metadata, system}_alloc_bits */
869  	seqlock_t profiles_lock;
870  	/*
871  	 * these three are in extended format (availability of single
872  	 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
873  	 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
874  	 */
875  	u64 avail_data_alloc_bits;
876  	u64 avail_metadata_alloc_bits;
877  	u64 avail_system_alloc_bits;
878  
879  	/* restriper state */
880  	spinlock_t balance_lock;
881  	struct mutex balance_mutex;
882  	atomic_t balance_pause_req;
883  	atomic_t balance_cancel_req;
884  	struct btrfs_balance_control *balance_ctl;
885  	wait_queue_head_t balance_wait_q;
886  
887  	/* Cancellation requests for chunk relocation */
888  	atomic_t reloc_cancel_req;
889  
890  	u32 data_chunk_allocations;
891  	u32 metadata_ratio;
892  
893  	void *bdev_holder;
894  
895  	/* private scrub information */
896  	struct mutex scrub_lock;
897  	atomic_t scrubs_running;
898  	atomic_t scrub_pause_req;
899  	atomic_t scrubs_paused;
900  	atomic_t scrub_cancel_req;
901  	wait_queue_head_t scrub_pause_wait;
902  	/*
903  	 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
904  	 * running.
905  	 */
906  	refcount_t scrub_workers_refcnt;
907  	struct btrfs_workqueue *scrub_workers;
908  	struct btrfs_workqueue *scrub_wr_completion_workers;
909  	struct btrfs_workqueue *scrub_parity_workers;
910  	struct btrfs_subpage_info *subpage_info;
911  
912  	struct btrfs_discard_ctl discard_ctl;
913  
914  #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
915  	u32 check_integrity_print_mask;
916  #endif
917  	/* is qgroup tracking in a consistent state? */
918  	u64 qgroup_flags;
919  
920  	/* holds configuration and tracking. Protected by qgroup_lock */
921  	struct rb_root qgroup_tree;
922  	spinlock_t qgroup_lock;
923  
924  	/*
925  	 * used to avoid frequently calling ulist_alloc()/ulist_free()
926  	 * when doing qgroup accounting, it must be protected by qgroup_lock.
927  	 */
928  	struct ulist *qgroup_ulist;
929  
930  	/*
931  	 * Protect user change for quota operations. If a transaction is needed,
932  	 * it must be started before locking this lock.
933  	 */
934  	struct mutex qgroup_ioctl_lock;
935  
936  	/* list of dirty qgroups to be written at next commit */
937  	struct list_head dirty_qgroups;
938  
939  	/* used by qgroup for an efficient tree traversal */
940  	u64 qgroup_seq;
941  
942  	/* qgroup rescan items */
943  	struct mutex qgroup_rescan_lock; /* protects the progress item */
944  	struct btrfs_key qgroup_rescan_progress;
945  	struct btrfs_workqueue *qgroup_rescan_workers;
946  	struct completion qgroup_rescan_completion;
947  	struct btrfs_work qgroup_rescan_work;
948  	bool qgroup_rescan_running;	/* protected by qgroup_rescan_lock */
949  
950  	/* filesystem state */
951  	unsigned long fs_state;
952  
953  	struct btrfs_delayed_root *delayed_root;
954  
955  	/* readahead tree */
956  	spinlock_t reada_lock;
957  	struct radix_tree_root reada_tree;
958  
959  	/* readahead works cnt */
960  	atomic_t reada_works_cnt;
961  
962  	/* Extent buffer radix tree */
963  	spinlock_t buffer_lock;
964  	/* Entries are eb->start / sectorsize */
965  	struct radix_tree_root buffer_radix;
966  
967  	/* next backup root to be overwritten */
968  	int backup_root_index;
969  
970  	/* device replace state */
971  	struct btrfs_dev_replace dev_replace;
972  
973  	struct semaphore uuid_tree_rescan_sem;
974  
975  	/* Used to reclaim the metadata space in the background. */
976  	struct work_struct async_reclaim_work;
977  	struct work_struct async_data_reclaim_work;
978  	struct work_struct preempt_reclaim_work;
979  
980  	/* Reclaim partially filled block groups in the background */
981  	struct work_struct reclaim_bgs_work;
982  	struct list_head reclaim_bgs;
983  	int bg_reclaim_threshold;
984  
985  	spinlock_t unused_bgs_lock;
986  	struct list_head unused_bgs;
987  	struct mutex unused_bg_unpin_mutex;
988  	/* Protect block groups that are going to be deleted */
989  	struct mutex reclaim_bgs_lock;
990  
991  	/* Cached block sizes */
992  	u32 nodesize;
993  	u32 sectorsize;
994  	/* ilog2 of sectorsize, use to avoid 64bit division */
995  	u32 sectorsize_bits;
996  	u32 csum_size;
997  	u32 csums_per_leaf;
998  	u32 stripesize;
999  
1000  	/* Block groups and devices containing active swapfiles. */
1001  	spinlock_t swapfile_pins_lock;
1002  	struct rb_root swapfile_pins;
1003  
1004  	struct crypto_shash *csum_shash;
1005  
1006  	spinlock_t send_reloc_lock;
1007  	/*
1008  	 * Number of send operations in progress.
1009  	 * Updated while holding fs_info::send_reloc_lock.
1010  	 */
1011  	int send_in_progress;
1012  
1013  	/* Type of exclusive operation running, protected by super_lock */
1014  	enum btrfs_exclusive_operation exclusive_operation;
1015  
1016  	/*
1017  	 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1018  	 * if the mode is enabled
1019  	 */
1020  	union {
1021  		u64 zone_size;
1022  		u64 zoned;
1023  	};
1024  
1025  	struct mutex zoned_meta_io_lock;
1026  	spinlock_t treelog_bg_lock;
1027  	u64 treelog_bg;
1028  
1029  	/*
1030  	 * Start of the dedicated data relocation block group, protected by
1031  	 * relocation_bg_lock.
1032  	 */
1033  	spinlock_t relocation_bg_lock;
1034  	u64 data_reloc_bg;
1035  
1036  	spinlock_t zone_active_bgs_lock;
1037  	struct list_head zone_active_bgs;
1038  
1039  #ifdef CONFIG_BTRFS_FS_REF_VERIFY
1040  	spinlock_t ref_verify_lock;
1041  	struct rb_root block_tree;
1042  #endif
1043  
1044  #ifdef CONFIG_BTRFS_DEBUG
1045  	struct kobject *debug_kobj;
1046  	struct kobject *discard_debug_kobj;
1047  	struct list_head allocated_roots;
1048  
1049  	spinlock_t eb_leak_lock;
1050  	struct list_head allocated_ebs;
1051  #endif
1052  };
1053  
1054  static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1055  {
1056  	return sb->s_fs_info;
1057  }
1058  
1059  /*
1060   * The state of btrfs root
1061   */
1062  enum {
1063  	/*
1064  	 * btrfs_record_root_in_trans is a multi-step process, and it can race
1065  	 * with the balancing code.   But the race is very small, and only the
1066  	 * first time the root is added to each transaction.  So IN_TRANS_SETUP
1067  	 * is used to tell us when more checks are required
1068  	 */
1069  	BTRFS_ROOT_IN_TRANS_SETUP,
1070  
1071  	/*
1072  	 * Set if tree blocks of this root can be shared by other roots.
1073  	 * Only subvolume trees and their reloc trees have this bit set.
1074  	 * Conflicts with TRACK_DIRTY bit.
1075  	 *
1076  	 * This affects two things:
1077  	 *
1078  	 * - How balance works
1079  	 *   For shareable roots, we need to use reloc tree and do path
1080  	 *   replacement for balance, and need various pre/post hooks for
1081  	 *   snapshot creation to handle them.
1082  	 *
1083  	 *   While for non-shareable trees, we just simply do a tree search
1084  	 *   with COW.
1085  	 *
1086  	 * - How dirty roots are tracked
1087  	 *   For shareable roots, btrfs_record_root_in_trans() is needed to
1088  	 *   track them, while non-subvolume roots have TRACK_DIRTY bit, they
1089  	 *   don't need to set this manually.
1090  	 */
1091  	BTRFS_ROOT_SHAREABLE,
1092  	BTRFS_ROOT_TRACK_DIRTY,
1093  	BTRFS_ROOT_IN_RADIX,
1094  	BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1095  	BTRFS_ROOT_DEFRAG_RUNNING,
1096  	BTRFS_ROOT_FORCE_COW,
1097  	BTRFS_ROOT_MULTI_LOG_TASKS,
1098  	BTRFS_ROOT_DIRTY,
1099  	BTRFS_ROOT_DELETING,
1100  
1101  	/*
1102  	 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1103  	 *
1104  	 * Set for the subvolume tree owning the reloc tree.
1105  	 */
1106  	BTRFS_ROOT_DEAD_RELOC_TREE,
1107  	/* Mark dead root stored on device whose cleanup needs to be resumed */
1108  	BTRFS_ROOT_DEAD_TREE,
1109  	/* The root has a log tree. Used for subvolume roots and the tree root. */
1110  	BTRFS_ROOT_HAS_LOG_TREE,
1111  	/* Qgroup flushing is in progress */
1112  	BTRFS_ROOT_QGROUP_FLUSHING,
1113  };
1114  
1115  /*
1116   * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1117   * code. For detail check comment in fs/btrfs/qgroup.c.
1118   */
1119  struct btrfs_qgroup_swapped_blocks {
1120  	spinlock_t lock;
1121  	/* RM_EMPTY_ROOT() of above blocks[] */
1122  	bool swapped;
1123  	struct rb_root blocks[BTRFS_MAX_LEVEL];
1124  };
1125  
1126  /*
1127   * in ram representation of the tree.  extent_root is used for all allocations
1128   * and for the extent tree extent_root root.
1129   */
1130  struct btrfs_root {
1131  	struct extent_buffer *node;
1132  
1133  	struct extent_buffer *commit_root;
1134  	struct btrfs_root *log_root;
1135  	struct btrfs_root *reloc_root;
1136  
1137  	unsigned long state;
1138  	struct btrfs_root_item root_item;
1139  	struct btrfs_key root_key;
1140  	struct btrfs_fs_info *fs_info;
1141  	struct extent_io_tree dirty_log_pages;
1142  
1143  	struct mutex objectid_mutex;
1144  
1145  	spinlock_t accounting_lock;
1146  	struct btrfs_block_rsv *block_rsv;
1147  
1148  	struct mutex log_mutex;
1149  	wait_queue_head_t log_writer_wait;
1150  	wait_queue_head_t log_commit_wait[2];
1151  	struct list_head log_ctxs[2];
1152  	/* Used only for log trees of subvolumes, not for the log root tree */
1153  	atomic_t log_writers;
1154  	atomic_t log_commit[2];
1155  	/* Used only for log trees of subvolumes, not for the log root tree */
1156  	atomic_t log_batch;
1157  	int log_transid;
1158  	/* No matter the commit succeeds or not*/
1159  	int log_transid_committed;
1160  	/* Just be updated when the commit succeeds. */
1161  	int last_log_commit;
1162  	pid_t log_start_pid;
1163  
1164  	u64 last_trans;
1165  
1166  	u32 type;
1167  
1168  	u64 free_objectid;
1169  
1170  	struct btrfs_key defrag_progress;
1171  	struct btrfs_key defrag_max;
1172  
1173  	/* The dirty list is only used by non-shareable roots */
1174  	struct list_head dirty_list;
1175  
1176  	struct list_head root_list;
1177  
1178  	spinlock_t log_extents_lock[2];
1179  	struct list_head logged_list[2];
1180  
1181  	int orphan_cleanup_state;
1182  
1183  	spinlock_t inode_lock;
1184  	/* red-black tree that keeps track of in-memory inodes */
1185  	struct rb_root inode_tree;
1186  
1187  	/*
1188  	 * radix tree that keeps track of delayed nodes of every inode,
1189  	 * protected by inode_lock
1190  	 */
1191  	struct radix_tree_root delayed_nodes_tree;
1192  	/*
1193  	 * right now this just gets used so that a root has its own devid
1194  	 * for stat.  It may be used for more later
1195  	 */
1196  	dev_t anon_dev;
1197  
1198  	spinlock_t root_item_lock;
1199  	refcount_t refs;
1200  
1201  	struct mutex delalloc_mutex;
1202  	spinlock_t delalloc_lock;
1203  	/*
1204  	 * all of the inodes that have delalloc bytes.  It is possible for
1205  	 * this list to be empty even when there is still dirty data=ordered
1206  	 * extents waiting to finish IO.
1207  	 */
1208  	struct list_head delalloc_inodes;
1209  	struct list_head delalloc_root;
1210  	u64 nr_delalloc_inodes;
1211  
1212  	struct mutex ordered_extent_mutex;
1213  	/*
1214  	 * this is used by the balancing code to wait for all the pending
1215  	 * ordered extents
1216  	 */
1217  	spinlock_t ordered_extent_lock;
1218  
1219  	/*
1220  	 * all of the data=ordered extents pending writeback
1221  	 * these can span multiple transactions and basically include
1222  	 * every dirty data page that isn't from nodatacow
1223  	 */
1224  	struct list_head ordered_extents;
1225  	struct list_head ordered_root;
1226  	u64 nr_ordered_extents;
1227  
1228  	/*
1229  	 * Not empty if this subvolume root has gone through tree block swap
1230  	 * (relocation)
1231  	 *
1232  	 * Will be used by reloc_control::dirty_subvol_roots.
1233  	 */
1234  	struct list_head reloc_dirty_list;
1235  
1236  	/*
1237  	 * Number of currently running SEND ioctls to prevent
1238  	 * manipulation with the read-only status via SUBVOL_SETFLAGS
1239  	 */
1240  	int send_in_progress;
1241  	/*
1242  	 * Number of currently running deduplication operations that have a
1243  	 * destination inode belonging to this root. Protected by the lock
1244  	 * root_item_lock.
1245  	 */
1246  	int dedupe_in_progress;
1247  	/* For exclusion of snapshot creation and nocow writes */
1248  	struct btrfs_drew_lock snapshot_lock;
1249  
1250  	atomic_t snapshot_force_cow;
1251  
1252  	/* For qgroup metadata reserved space */
1253  	spinlock_t qgroup_meta_rsv_lock;
1254  	u64 qgroup_meta_rsv_pertrans;
1255  	u64 qgroup_meta_rsv_prealloc;
1256  	wait_queue_head_t qgroup_flush_wait;
1257  
1258  	/* Number of active swapfiles */
1259  	atomic_t nr_swapfiles;
1260  
1261  	/* Record pairs of swapped blocks for qgroup */
1262  	struct btrfs_qgroup_swapped_blocks swapped_blocks;
1263  
1264  	/* Used only by log trees, when logging csum items */
1265  	struct extent_io_tree log_csum_range;
1266  
1267  #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1268  	u64 alloc_bytenr;
1269  #endif
1270  
1271  #ifdef CONFIG_BTRFS_DEBUG
1272  	struct list_head leak_list;
1273  #endif
1274  };
1275  
1276  /*
1277   * Structure that conveys information about an extent that is going to replace
1278   * all the extents in a file range.
1279   */
1280  struct btrfs_replace_extent_info {
1281  	u64 disk_offset;
1282  	u64 disk_len;
1283  	u64 data_offset;
1284  	u64 data_len;
1285  	u64 file_offset;
1286  	/* Pointer to a file extent item of type regular or prealloc. */
1287  	char *extent_buf;
1288  	/*
1289  	 * Set to true when attempting to replace a file range with a new extent
1290  	 * described by this structure, set to false when attempting to clone an
1291  	 * existing extent into a file range.
1292  	 */
1293  	bool is_new_extent;
1294  	/* Meaningful only if is_new_extent is true. */
1295  	int qgroup_reserved;
1296  	/*
1297  	 * Meaningful only if is_new_extent is true.
1298  	 * Used to track how many extent items we have already inserted in a
1299  	 * subvolume tree that refer to the extent described by this structure,
1300  	 * so that we know when to create a new delayed ref or update an existing
1301  	 * one.
1302  	 */
1303  	int insertions;
1304  };
1305  
1306  /* Arguments for btrfs_drop_extents() */
1307  struct btrfs_drop_extents_args {
1308  	/* Input parameters */
1309  
1310  	/*
1311  	 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1312  	 * If 'replace_extent' is true, this must not be NULL. Also the path
1313  	 * is always released except if 'replace_extent' is true and
1314  	 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1315  	 * the path is kept locked.
1316  	 */
1317  	struct btrfs_path *path;
1318  	/* Start offset of the range to drop extents from */
1319  	u64 start;
1320  	/* End (exclusive, last byte + 1) of the range to drop extents from */
1321  	u64 end;
1322  	/* If true drop all the extent maps in the range */
1323  	bool drop_cache;
1324  	/*
1325  	 * If true it means we want to insert a new extent after dropping all
1326  	 * the extents in the range. If this is true, the 'extent_item_size'
1327  	 * parameter must be set as well and the 'extent_inserted' field will
1328  	 * be set to true by btrfs_drop_extents() if it could insert the new
1329  	 * extent.
1330  	 * Note: when this is set to true the path must not be NULL.
1331  	 */
1332  	bool replace_extent;
1333  	/*
1334  	 * Used if 'replace_extent' is true. Size of the file extent item to
1335  	 * insert after dropping all existing extents in the range
1336  	 */
1337  	u32 extent_item_size;
1338  
1339  	/* Output parameters */
1340  
1341  	/*
1342  	 * Set to the minimum between the input parameter 'end' and the end
1343  	 * (exclusive, last byte + 1) of the last dropped extent. This is always
1344  	 * set even if btrfs_drop_extents() returns an error.
1345  	 */
1346  	u64 drop_end;
1347  	/*
1348  	 * The number of allocated bytes found in the range. This can be smaller
1349  	 * than the range's length when there are holes in the range.
1350  	 */
1351  	u64 bytes_found;
1352  	/*
1353  	 * Only set if 'replace_extent' is true. Set to true if we were able
1354  	 * to insert a replacement extent after dropping all extents in the
1355  	 * range, otherwise set to false by btrfs_drop_extents().
1356  	 * Also, if btrfs_drop_extents() has set this to true it means it
1357  	 * returned with the path locked, otherwise if it has set this to
1358  	 * false it has returned with the path released.
1359  	 */
1360  	bool extent_inserted;
1361  };
1362  
1363  struct btrfs_file_private {
1364  	void *filldir_buf;
1365  };
1366  
1367  
1368  static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1369  {
1370  
1371  	return info->nodesize - sizeof(struct btrfs_header);
1372  }
1373  
1374  #define BTRFS_LEAF_DATA_OFFSET		offsetof(struct btrfs_leaf, items)
1375  
1376  static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1377  {
1378  	return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1379  }
1380  
1381  static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1382  {
1383  	return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1384  }
1385  
1386  #define BTRFS_FILE_EXTENT_INLINE_DATA_START		\
1387  		(offsetof(struct btrfs_file_extent_item, disk_bytenr))
1388  static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1389  {
1390  	return BTRFS_MAX_ITEM_SIZE(info) -
1391  	       BTRFS_FILE_EXTENT_INLINE_DATA_START;
1392  }
1393  
1394  static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1395  {
1396  	return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1397  }
1398  
1399  /*
1400   * Flags for mount options.
1401   *
1402   * Note: don't forget to add new options to btrfs_show_options()
1403   */
1404  enum {
1405  	BTRFS_MOUNT_NODATASUM			= (1UL << 0),
1406  	BTRFS_MOUNT_NODATACOW			= (1UL << 1),
1407  	BTRFS_MOUNT_NOBARRIER			= (1UL << 2),
1408  	BTRFS_MOUNT_SSD				= (1UL << 3),
1409  	BTRFS_MOUNT_DEGRADED			= (1UL << 4),
1410  	BTRFS_MOUNT_COMPRESS			= (1UL << 5),
1411  	BTRFS_MOUNT_NOTREELOG   		= (1UL << 6),
1412  	BTRFS_MOUNT_FLUSHONCOMMIT		= (1UL << 7),
1413  	BTRFS_MOUNT_SSD_SPREAD			= (1UL << 8),
1414  	BTRFS_MOUNT_NOSSD			= (1UL << 9),
1415  	BTRFS_MOUNT_DISCARD_SYNC		= (1UL << 10),
1416  	BTRFS_MOUNT_FORCE_COMPRESS      	= (1UL << 11),
1417  	BTRFS_MOUNT_SPACE_CACHE			= (1UL << 12),
1418  	BTRFS_MOUNT_CLEAR_CACHE			= (1UL << 13),
1419  	BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED	= (1UL << 14),
1420  	BTRFS_MOUNT_ENOSPC_DEBUG		= (1UL << 15),
1421  	BTRFS_MOUNT_AUTO_DEFRAG			= (1UL << 16),
1422  	BTRFS_MOUNT_USEBACKUPROOT		= (1UL << 17),
1423  	BTRFS_MOUNT_SKIP_BALANCE		= (1UL << 18),
1424  	BTRFS_MOUNT_CHECK_INTEGRITY		= (1UL << 19),
1425  	BTRFS_MOUNT_CHECK_INTEGRITY_DATA	= (1UL << 20),
1426  	BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	= (1UL << 21),
1427  	BTRFS_MOUNT_RESCAN_UUID_TREE		= (1UL << 22),
1428  	BTRFS_MOUNT_FRAGMENT_DATA		= (1UL << 23),
1429  	BTRFS_MOUNT_FRAGMENT_METADATA		= (1UL << 24),
1430  	BTRFS_MOUNT_FREE_SPACE_TREE		= (1UL << 25),
1431  	BTRFS_MOUNT_NOLOGREPLAY			= (1UL << 26),
1432  	BTRFS_MOUNT_REF_VERIFY			= (1UL << 27),
1433  	BTRFS_MOUNT_DISCARD_ASYNC		= (1UL << 28),
1434  	BTRFS_MOUNT_IGNOREBADROOTS		= (1UL << 29),
1435  	BTRFS_MOUNT_IGNOREDATACSUMS		= (1UL << 30),
1436  };
1437  
1438  #define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)
1439  #define BTRFS_DEFAULT_MAX_INLINE	(2048)
1440  
1441  #define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
1442  #define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
1443  #define btrfs_raw_test_opt(o, opt)	((o) & BTRFS_MOUNT_##opt)
1444  #define btrfs_test_opt(fs_info, opt)	((fs_info)->mount_opt & \
1445  					 BTRFS_MOUNT_##opt)
1446  
1447  #define btrfs_set_and_info(fs_info, opt, fmt, args...)			\
1448  do {									\
1449  	if (!btrfs_test_opt(fs_info, opt))				\
1450  		btrfs_info(fs_info, fmt, ##args);			\
1451  	btrfs_set_opt(fs_info->mount_opt, opt);				\
1452  } while (0)
1453  
1454  #define btrfs_clear_and_info(fs_info, opt, fmt, args...)		\
1455  do {									\
1456  	if (btrfs_test_opt(fs_info, opt))				\
1457  		btrfs_info(fs_info, fmt, ##args);			\
1458  	btrfs_clear_opt(fs_info->mount_opt, opt);			\
1459  } while (0)
1460  
1461  /*
1462   * Requests for changes that need to be done during transaction commit.
1463   *
1464   * Internal mount options that are used for special handling of the real
1465   * mount options (eg. cannot be set during remount and have to be set during
1466   * transaction commit)
1467   */
1468  
1469  #define BTRFS_PENDING_COMMIT			(0)
1470  
1471  #define btrfs_test_pending(info, opt)	\
1472  	test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1473  #define btrfs_set_pending(info, opt)	\
1474  	set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1475  #define btrfs_clear_pending(info, opt)	\
1476  	clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1477  
1478  /*
1479   * Helpers for setting pending mount option changes.
1480   *
1481   * Expects corresponding macros
1482   * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1483   */
1484  #define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1485  do {                                                                   \
1486         if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1487                 btrfs_info((info), fmt, ##args);                        \
1488                 btrfs_set_pending((info), SET_##opt);                   \
1489                 btrfs_clear_pending((info), CLEAR_##opt);               \
1490         }                                                               \
1491  } while(0)
1492  
1493  #define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1494  do {                                                                   \
1495         if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1496                 btrfs_info((info), fmt, ##args);                        \
1497                 btrfs_set_pending((info), CLEAR_##opt);                 \
1498                 btrfs_clear_pending((info), SET_##opt);                 \
1499         }                                                               \
1500  } while(0)
1501  
1502  /*
1503   * Inode flags
1504   */
1505  #define BTRFS_INODE_NODATASUM		(1U << 0)
1506  #define BTRFS_INODE_NODATACOW		(1U << 1)
1507  #define BTRFS_INODE_READONLY		(1U << 2)
1508  #define BTRFS_INODE_NOCOMPRESS		(1U << 3)
1509  #define BTRFS_INODE_PREALLOC		(1U << 4)
1510  #define BTRFS_INODE_SYNC		(1U << 5)
1511  #define BTRFS_INODE_IMMUTABLE		(1U << 6)
1512  #define BTRFS_INODE_APPEND		(1U << 7)
1513  #define BTRFS_INODE_NODUMP		(1U << 8)
1514  #define BTRFS_INODE_NOATIME		(1U << 9)
1515  #define BTRFS_INODE_DIRSYNC		(1U << 10)
1516  #define BTRFS_INODE_COMPRESS		(1U << 11)
1517  
1518  #define BTRFS_INODE_ROOT_ITEM_INIT	(1U << 31)
1519  
1520  #define BTRFS_INODE_FLAG_MASK						\
1521  	(BTRFS_INODE_NODATASUM |					\
1522  	 BTRFS_INODE_NODATACOW |					\
1523  	 BTRFS_INODE_READONLY |						\
1524  	 BTRFS_INODE_NOCOMPRESS |					\
1525  	 BTRFS_INODE_PREALLOC |						\
1526  	 BTRFS_INODE_SYNC |						\
1527  	 BTRFS_INODE_IMMUTABLE |					\
1528  	 BTRFS_INODE_APPEND |						\
1529  	 BTRFS_INODE_NODUMP |						\
1530  	 BTRFS_INODE_NOATIME |						\
1531  	 BTRFS_INODE_DIRSYNC |						\
1532  	 BTRFS_INODE_COMPRESS |						\
1533  	 BTRFS_INODE_ROOT_ITEM_INIT)
1534  
1535  #define BTRFS_INODE_RO_VERITY		(1U << 0)
1536  
1537  #define BTRFS_INODE_RO_FLAG_MASK	(BTRFS_INODE_RO_VERITY)
1538  
1539  struct btrfs_map_token {
1540  	struct extent_buffer *eb;
1541  	char *kaddr;
1542  	unsigned long offset;
1543  };
1544  
1545  #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1546  				((bytes) >> (fs_info)->sectorsize_bits)
1547  
1548  static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1549  					struct extent_buffer *eb)
1550  {
1551  	token->eb = eb;
1552  	token->kaddr = page_address(eb->pages[0]);
1553  	token->offset = 0;
1554  }
1555  
1556  /* some macros to generate set/get functions for the struct fields.  This
1557   * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1558   * one for u8:
1559   */
1560  #define le8_to_cpu(v) (v)
1561  #define cpu_to_le8(v) (v)
1562  #define __le8 u8
1563  
1564  static inline u8 get_unaligned_le8(const void *p)
1565  {
1566         return *(u8 *)p;
1567  }
1568  
1569  static inline void put_unaligned_le8(u8 val, void *p)
1570  {
1571         *(u8 *)p = val;
1572  }
1573  
1574  #define read_eb_member(eb, ptr, type, member, result) (\
1575  	read_extent_buffer(eb, (char *)(result),			\
1576  			   ((unsigned long)(ptr)) +			\
1577  			    offsetof(type, member),			\
1578  			   sizeof(((type *)0)->member)))
1579  
1580  #define write_eb_member(eb, ptr, type, member, result) (\
1581  	write_extent_buffer(eb, (char *)(result),			\
1582  			   ((unsigned long)(ptr)) +			\
1583  			    offsetof(type, member),			\
1584  			   sizeof(((type *)0)->member)))
1585  
1586  #define DECLARE_BTRFS_SETGET_BITS(bits)					\
1587  u##bits btrfs_get_token_##bits(struct btrfs_map_token *token,		\
1588  			       const void *ptr, unsigned long off);	\
1589  void btrfs_set_token_##bits(struct btrfs_map_token *token,		\
1590  			    const void *ptr, unsigned long off,		\
1591  			    u##bits val);				\
1592  u##bits btrfs_get_##bits(const struct extent_buffer *eb,		\
1593  			 const void *ptr, unsigned long off);		\
1594  void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr,	\
1595  		      unsigned long off, u##bits val);
1596  
1597  DECLARE_BTRFS_SETGET_BITS(8)
1598  DECLARE_BTRFS_SETGET_BITS(16)
1599  DECLARE_BTRFS_SETGET_BITS(32)
1600  DECLARE_BTRFS_SETGET_BITS(64)
1601  
1602  #define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
1603  static inline u##bits btrfs_##name(const struct extent_buffer *eb,	\
1604  				   const type *s)			\
1605  {									\
1606  	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1607  	return btrfs_get_##bits(eb, s, offsetof(type, member));		\
1608  }									\
1609  static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1610  				    u##bits val)			\
1611  {									\
1612  	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1613  	btrfs_set_##bits(eb, s, offsetof(type, member), val);		\
1614  }									\
1615  static inline u##bits btrfs_token_##name(struct btrfs_map_token *token,	\
1616  					 const type *s)			\
1617  {									\
1618  	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1619  	return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1620  }									\
1621  static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1622  					  type *s, u##bits val)		\
1623  {									\
1624  	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1625  	btrfs_set_token_##bits(token, s, offsetof(type, member), val);	\
1626  }
1627  
1628  #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
1629  static inline u##bits btrfs_##name(const struct extent_buffer *eb)	\
1630  {									\
1631  	const type *p = page_address(eb->pages[0]) +			\
1632  			offset_in_page(eb->start);			\
1633  	return get_unaligned_le##bits(&p->member);			\
1634  }									\
1635  static inline void btrfs_set_##name(const struct extent_buffer *eb,	\
1636  				    u##bits val)			\
1637  {									\
1638  	type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1639  	put_unaligned_le##bits(val, &p->member);			\
1640  }
1641  
1642  #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
1643  static inline u##bits btrfs_##name(const type *s)			\
1644  {									\
1645  	return get_unaligned_le##bits(&s->member);			\
1646  }									\
1647  static inline void btrfs_set_##name(type *s, u##bits val)		\
1648  {									\
1649  	put_unaligned_le##bits(val, &s->member);			\
1650  }
1651  
1652  static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1653  					   struct btrfs_dev_item *s)
1654  {
1655  	BUILD_BUG_ON(sizeof(u64) !=
1656  		     sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1657  	return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1658  					    total_bytes));
1659  }
1660  static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1661  						struct btrfs_dev_item *s,
1662  						u64 val)
1663  {
1664  	BUILD_BUG_ON(sizeof(u64) !=
1665  		     sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1666  	WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1667  	btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1668  }
1669  
1670  
1671  BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1672  BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1673  BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1674  BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1675  BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1676  		   start_offset, 64);
1677  BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1678  BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1679  BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1680  BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1681  BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1682  BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1683  
1684  BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1685  BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1686  			 total_bytes, 64);
1687  BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1688  			 bytes_used, 64);
1689  BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1690  			 io_align, 32);
1691  BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1692  			 io_width, 32);
1693  BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1694  			 sector_size, 32);
1695  BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1696  BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1697  			 dev_group, 32);
1698  BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1699  			 seek_speed, 8);
1700  BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1701  			 bandwidth, 8);
1702  BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1703  			 generation, 64);
1704  
1705  static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1706  {
1707  	return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1708  }
1709  
1710  static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1711  {
1712  	return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1713  }
1714  
1715  BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1716  BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1717  BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1718  BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1719  BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1720  BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1721  BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1722  BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1723  BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1724  BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1725  BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1726  
1727  static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1728  {
1729  	return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1730  }
1731  
1732  BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1733  BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1734  BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1735  			 stripe_len, 64);
1736  BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1737  			 io_align, 32);
1738  BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1739  			 io_width, 32);
1740  BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1741  			 sector_size, 32);
1742  BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1743  BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1744  			 num_stripes, 16);
1745  BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1746  			 sub_stripes, 16);
1747  BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1748  BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1749  
1750  static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1751  						   int nr)
1752  {
1753  	unsigned long offset = (unsigned long)c;
1754  	offset += offsetof(struct btrfs_chunk, stripe);
1755  	offset += nr * sizeof(struct btrfs_stripe);
1756  	return (struct btrfs_stripe *)offset;
1757  }
1758  
1759  static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1760  {
1761  	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1762  }
1763  
1764  static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1765  					 struct btrfs_chunk *c, int nr)
1766  {
1767  	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1768  }
1769  
1770  static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1771  					 struct btrfs_chunk *c, int nr)
1772  {
1773  	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1774  }
1775  
1776  /* struct btrfs_block_group_item */
1777  BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1778  			 used, 64);
1779  BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1780  			 used, 64);
1781  BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1782  			struct btrfs_block_group_item, chunk_objectid, 64);
1783  
1784  BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1785  		   struct btrfs_block_group_item, chunk_objectid, 64);
1786  BTRFS_SETGET_FUNCS(block_group_flags,
1787  		   struct btrfs_block_group_item, flags, 64);
1788  BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1789  			struct btrfs_block_group_item, flags, 64);
1790  
1791  /* struct btrfs_free_space_info */
1792  BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1793  		   extent_count, 32);
1794  BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1795  
1796  /* struct btrfs_inode_ref */
1797  BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1798  BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1799  
1800  /* struct btrfs_inode_extref */
1801  BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1802  		   parent_objectid, 64);
1803  BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1804  		   name_len, 16);
1805  BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1806  
1807  /* struct btrfs_inode_item */
1808  BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1809  BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1810  BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1811  BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1812  BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1813  BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1814  BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1815  BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1816  BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1817  BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1818  BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1819  BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1820  BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1821  			 generation, 64);
1822  BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1823  			 sequence, 64);
1824  BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1825  			 transid, 64);
1826  BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1827  BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1828  			 nbytes, 64);
1829  BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1830  			 block_group, 64);
1831  BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1832  BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1833  BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1834  BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1835  BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1836  BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1837  BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1838  BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1839  BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1840  BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1841  
1842  /* struct btrfs_dev_extent */
1843  BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1844  		   chunk_tree, 64);
1845  BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1846  		   chunk_objectid, 64);
1847  BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1848  		   chunk_offset, 64);
1849  BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1850  BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1851  BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1852  		   generation, 64);
1853  BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1854  
1855  BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1856  
1857  static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1858  					struct btrfs_tree_block_info *item,
1859  					struct btrfs_disk_key *key)
1860  {
1861  	read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1862  }
1863  
1864  static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1865  					    struct btrfs_tree_block_info *item,
1866  					    struct btrfs_disk_key *key)
1867  {
1868  	write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1869  }
1870  
1871  BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1872  		   root, 64);
1873  BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1874  		   objectid, 64);
1875  BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1876  		   offset, 64);
1877  BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1878  		   count, 32);
1879  
1880  BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1881  		   count, 32);
1882  
1883  BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1884  		   type, 8);
1885  BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1886  		   offset, 64);
1887  
1888  static inline u32 btrfs_extent_inline_ref_size(int type)
1889  {
1890  	if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1891  	    type == BTRFS_SHARED_BLOCK_REF_KEY)
1892  		return sizeof(struct btrfs_extent_inline_ref);
1893  	if (type == BTRFS_SHARED_DATA_REF_KEY)
1894  		return sizeof(struct btrfs_shared_data_ref) +
1895  		       sizeof(struct btrfs_extent_inline_ref);
1896  	if (type == BTRFS_EXTENT_DATA_REF_KEY)
1897  		return sizeof(struct btrfs_extent_data_ref) +
1898  		       offsetof(struct btrfs_extent_inline_ref, offset);
1899  	return 0;
1900  }
1901  
1902  /* struct btrfs_node */
1903  BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1904  BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1905  BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1906  			 blockptr, 64);
1907  BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1908  			 generation, 64);
1909  
1910  static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1911  {
1912  	unsigned long ptr;
1913  	ptr = offsetof(struct btrfs_node, ptrs) +
1914  		sizeof(struct btrfs_key_ptr) * nr;
1915  	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1916  }
1917  
1918  static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1919  					   int nr, u64 val)
1920  {
1921  	unsigned long ptr;
1922  	ptr = offsetof(struct btrfs_node, ptrs) +
1923  		sizeof(struct btrfs_key_ptr) * nr;
1924  	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1925  }
1926  
1927  static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1928  {
1929  	unsigned long ptr;
1930  	ptr = offsetof(struct btrfs_node, ptrs) +
1931  		sizeof(struct btrfs_key_ptr) * nr;
1932  	return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1933  }
1934  
1935  static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1936  						 int nr, u64 val)
1937  {
1938  	unsigned long ptr;
1939  	ptr = offsetof(struct btrfs_node, ptrs) +
1940  		sizeof(struct btrfs_key_ptr) * nr;
1941  	btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1942  }
1943  
1944  static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1945  {
1946  	return offsetof(struct btrfs_node, ptrs) +
1947  		sizeof(struct btrfs_key_ptr) * nr;
1948  }
1949  
1950  void btrfs_node_key(const struct extent_buffer *eb,
1951  		    struct btrfs_disk_key *disk_key, int nr);
1952  
1953  static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1954  				      struct btrfs_disk_key *disk_key, int nr)
1955  {
1956  	unsigned long ptr;
1957  	ptr = btrfs_node_key_ptr_offset(nr);
1958  	write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1959  		       struct btrfs_key_ptr, key, disk_key);
1960  }
1961  
1962  /* struct btrfs_item */
1963  BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1964  BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1965  BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1966  BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1967  
1968  static inline unsigned long btrfs_item_nr_offset(int nr)
1969  {
1970  	return offsetof(struct btrfs_leaf, items) +
1971  		sizeof(struct btrfs_item) * nr;
1972  }
1973  
1974  static inline struct btrfs_item *btrfs_item_nr(int nr)
1975  {
1976  	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1977  }
1978  
1979  static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1980  				 struct btrfs_item *item)
1981  {
1982  	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1983  }
1984  
1985  static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1986  {
1987  	return btrfs_item_end(eb, btrfs_item_nr(nr));
1988  }
1989  
1990  static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1991  {
1992  	return btrfs_item_offset(eb, btrfs_item_nr(nr));
1993  }
1994  
1995  static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1996  {
1997  	return btrfs_item_size(eb, btrfs_item_nr(nr));
1998  }
1999  
2000  static inline void btrfs_item_key(const struct extent_buffer *eb,
2001  			   struct btrfs_disk_key *disk_key, int nr)
2002  {
2003  	struct btrfs_item *item = btrfs_item_nr(nr);
2004  	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
2005  }
2006  
2007  static inline void btrfs_set_item_key(struct extent_buffer *eb,
2008  			       struct btrfs_disk_key *disk_key, int nr)
2009  {
2010  	struct btrfs_item *item = btrfs_item_nr(nr);
2011  	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
2012  }
2013  
2014  BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
2015  
2016  /*
2017   * struct btrfs_root_ref
2018   */
2019  BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
2020  BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
2021  BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
2022  
2023  /* struct btrfs_dir_item */
2024  BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2025  BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2026  BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2027  BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2028  BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2029  BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2030  			 data_len, 16);
2031  BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2032  			 name_len, 16);
2033  BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2034  			 transid, 64);
2035  
2036  static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2037  				      const struct btrfs_dir_item *item,
2038  				      struct btrfs_disk_key *key)
2039  {
2040  	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2041  }
2042  
2043  static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2044  					  struct btrfs_dir_item *item,
2045  					  const struct btrfs_disk_key *key)
2046  {
2047  	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2048  }
2049  
2050  BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2051  		   num_entries, 64);
2052  BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2053  		   num_bitmaps, 64);
2054  BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2055  		   generation, 64);
2056  
2057  static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2058  					const struct btrfs_free_space_header *h,
2059  					struct btrfs_disk_key *key)
2060  {
2061  	read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2062  }
2063  
2064  static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2065  					    struct btrfs_free_space_header *h,
2066  					    const struct btrfs_disk_key *key)
2067  {
2068  	write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2069  }
2070  
2071  /* struct btrfs_disk_key */
2072  BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2073  			 objectid, 64);
2074  BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2075  BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2076  
2077  #ifdef __LITTLE_ENDIAN
2078  
2079  /*
2080   * Optimized helpers for little-endian architectures where CPU and on-disk
2081   * structures have the same endianness and we can skip conversions.
2082   */
2083  
2084  static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2085  					 const struct btrfs_disk_key *disk_key)
2086  {
2087  	memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2088  }
2089  
2090  static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2091  					 const struct btrfs_key *cpu_key)
2092  {
2093  	memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2094  }
2095  
2096  static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2097  					 struct btrfs_key *cpu_key, int nr)
2098  {
2099  	struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2100  
2101  	btrfs_node_key(eb, disk_key, nr);
2102  }
2103  
2104  static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2105  					 struct btrfs_key *cpu_key, int nr)
2106  {
2107  	struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2108  
2109  	btrfs_item_key(eb, disk_key, nr);
2110  }
2111  
2112  static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2113  					     const struct btrfs_dir_item *item,
2114  					     struct btrfs_key *cpu_key)
2115  {
2116  	struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2117  
2118  	btrfs_dir_item_key(eb, item, disk_key);
2119  }
2120  
2121  #else
2122  
2123  static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2124  					 const struct btrfs_disk_key *disk)
2125  {
2126  	cpu->offset = le64_to_cpu(disk->offset);
2127  	cpu->type = disk->type;
2128  	cpu->objectid = le64_to_cpu(disk->objectid);
2129  }
2130  
2131  static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2132  					 const struct btrfs_key *cpu)
2133  {
2134  	disk->offset = cpu_to_le64(cpu->offset);
2135  	disk->type = cpu->type;
2136  	disk->objectid = cpu_to_le64(cpu->objectid);
2137  }
2138  
2139  static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2140  					 struct btrfs_key *key, int nr)
2141  {
2142  	struct btrfs_disk_key disk_key;
2143  	btrfs_node_key(eb, &disk_key, nr);
2144  	btrfs_disk_key_to_cpu(key, &disk_key);
2145  }
2146  
2147  static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2148  					 struct btrfs_key *key, int nr)
2149  {
2150  	struct btrfs_disk_key disk_key;
2151  	btrfs_item_key(eb, &disk_key, nr);
2152  	btrfs_disk_key_to_cpu(key, &disk_key);
2153  }
2154  
2155  static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2156  					     const struct btrfs_dir_item *item,
2157  					     struct btrfs_key *key)
2158  {
2159  	struct btrfs_disk_key disk_key;
2160  	btrfs_dir_item_key(eb, item, &disk_key);
2161  	btrfs_disk_key_to_cpu(key, &disk_key);
2162  }
2163  
2164  #endif
2165  
2166  /* struct btrfs_header */
2167  BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2168  BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2169  			  generation, 64);
2170  BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2171  BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2172  BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2173  BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2174  BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2175  			 generation, 64);
2176  BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2177  BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2178  			 nritems, 32);
2179  BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2180  
2181  static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2182  {
2183  	return (btrfs_header_flags(eb) & flag) == flag;
2184  }
2185  
2186  static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2187  {
2188  	u64 flags = btrfs_header_flags(eb);
2189  	btrfs_set_header_flags(eb, flags | flag);
2190  }
2191  
2192  static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2193  {
2194  	u64 flags = btrfs_header_flags(eb);
2195  	btrfs_set_header_flags(eb, flags & ~flag);
2196  }
2197  
2198  static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2199  {
2200  	u64 flags = btrfs_header_flags(eb);
2201  	return flags >> BTRFS_BACKREF_REV_SHIFT;
2202  }
2203  
2204  static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2205  						int rev)
2206  {
2207  	u64 flags = btrfs_header_flags(eb);
2208  	flags &= ~BTRFS_BACKREF_REV_MASK;
2209  	flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2210  	btrfs_set_header_flags(eb, flags);
2211  }
2212  
2213  static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2214  {
2215  	return btrfs_header_level(eb) == 0;
2216  }
2217  
2218  /* struct btrfs_root_item */
2219  BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2220  		   generation, 64);
2221  BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2222  BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2223  BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2224  
2225  BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2226  			 generation, 64);
2227  BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2228  BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2229  BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2230  BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2231  BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2232  BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2233  BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2234  BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2235  BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2236  			 last_snapshot, 64);
2237  BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2238  			 generation_v2, 64);
2239  BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2240  			 ctransid, 64);
2241  BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2242  			 otransid, 64);
2243  BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2244  			 stransid, 64);
2245  BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2246  			 rtransid, 64);
2247  
2248  static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2249  {
2250  	/* Byte-swap the constant at compile time, root_item::flags is LE */
2251  	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2252  }
2253  
2254  static inline bool btrfs_root_dead(const struct btrfs_root *root)
2255  {
2256  	/* Byte-swap the constant at compile time, root_item::flags is LE */
2257  	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2258  }
2259  
2260  /* struct btrfs_root_backup */
2261  BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2262  		   tree_root, 64);
2263  BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2264  		   tree_root_gen, 64);
2265  BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2266  		   tree_root_level, 8);
2267  
2268  BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2269  		   chunk_root, 64);
2270  BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2271  		   chunk_root_gen, 64);
2272  BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2273  		   chunk_root_level, 8);
2274  
2275  BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2276  		   extent_root, 64);
2277  BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2278  		   extent_root_gen, 64);
2279  BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2280  		   extent_root_level, 8);
2281  
2282  BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2283  		   fs_root, 64);
2284  BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2285  		   fs_root_gen, 64);
2286  BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2287  		   fs_root_level, 8);
2288  
2289  BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2290  		   dev_root, 64);
2291  BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2292  		   dev_root_gen, 64);
2293  BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2294  		   dev_root_level, 8);
2295  
2296  BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2297  		   csum_root, 64);
2298  BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2299  		   csum_root_gen, 64);
2300  BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2301  		   csum_root_level, 8);
2302  BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2303  		   total_bytes, 64);
2304  BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2305  		   bytes_used, 64);
2306  BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2307  		   num_devices, 64);
2308  
2309  /* struct btrfs_balance_item */
2310  BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2311  
2312  static inline void btrfs_balance_data(const struct extent_buffer *eb,
2313  				      const struct btrfs_balance_item *bi,
2314  				      struct btrfs_disk_balance_args *ba)
2315  {
2316  	read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2317  }
2318  
2319  static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2320  				  struct btrfs_balance_item *bi,
2321  				  const struct btrfs_disk_balance_args *ba)
2322  {
2323  	write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2324  }
2325  
2326  static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2327  				      const struct btrfs_balance_item *bi,
2328  				      struct btrfs_disk_balance_args *ba)
2329  {
2330  	read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2331  }
2332  
2333  static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2334  				  struct btrfs_balance_item *bi,
2335  				  const struct btrfs_disk_balance_args *ba)
2336  {
2337  	write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2338  }
2339  
2340  static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2341  				     const struct btrfs_balance_item *bi,
2342  				     struct btrfs_disk_balance_args *ba)
2343  {
2344  	read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2345  }
2346  
2347  static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2348  				 struct btrfs_balance_item *bi,
2349  				 const struct btrfs_disk_balance_args *ba)
2350  {
2351  	write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2352  }
2353  
2354  static inline void
2355  btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2356  			       const struct btrfs_disk_balance_args *disk)
2357  {
2358  	memset(cpu, 0, sizeof(*cpu));
2359  
2360  	cpu->profiles = le64_to_cpu(disk->profiles);
2361  	cpu->usage = le64_to_cpu(disk->usage);
2362  	cpu->devid = le64_to_cpu(disk->devid);
2363  	cpu->pstart = le64_to_cpu(disk->pstart);
2364  	cpu->pend = le64_to_cpu(disk->pend);
2365  	cpu->vstart = le64_to_cpu(disk->vstart);
2366  	cpu->vend = le64_to_cpu(disk->vend);
2367  	cpu->target = le64_to_cpu(disk->target);
2368  	cpu->flags = le64_to_cpu(disk->flags);
2369  	cpu->limit = le64_to_cpu(disk->limit);
2370  	cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2371  	cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2372  }
2373  
2374  static inline void
2375  btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2376  			       const struct btrfs_balance_args *cpu)
2377  {
2378  	memset(disk, 0, sizeof(*disk));
2379  
2380  	disk->profiles = cpu_to_le64(cpu->profiles);
2381  	disk->usage = cpu_to_le64(cpu->usage);
2382  	disk->devid = cpu_to_le64(cpu->devid);
2383  	disk->pstart = cpu_to_le64(cpu->pstart);
2384  	disk->pend = cpu_to_le64(cpu->pend);
2385  	disk->vstart = cpu_to_le64(cpu->vstart);
2386  	disk->vend = cpu_to_le64(cpu->vend);
2387  	disk->target = cpu_to_le64(cpu->target);
2388  	disk->flags = cpu_to_le64(cpu->flags);
2389  	disk->limit = cpu_to_le64(cpu->limit);
2390  	disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2391  	disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2392  }
2393  
2394  /* struct btrfs_super_block */
2395  BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2396  BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2397  BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2398  			 generation, 64);
2399  BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2400  BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2401  			 struct btrfs_super_block, sys_chunk_array_size, 32);
2402  BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2403  			 struct btrfs_super_block, chunk_root_generation, 64);
2404  BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2405  			 root_level, 8);
2406  BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2407  			 chunk_root, 64);
2408  BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2409  			 chunk_root_level, 8);
2410  BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2411  			 log_root, 64);
2412  BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2413  			 log_root_transid, 64);
2414  BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2415  			 log_root_level, 8);
2416  BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2417  			 total_bytes, 64);
2418  BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2419  			 bytes_used, 64);
2420  BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2421  			 sectorsize, 32);
2422  BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2423  			 nodesize, 32);
2424  BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2425  			 stripesize, 32);
2426  BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2427  			 root_dir_objectid, 64);
2428  BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2429  			 num_devices, 64);
2430  BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2431  			 compat_flags, 64);
2432  BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2433  			 compat_ro_flags, 64);
2434  BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2435  			 incompat_flags, 64);
2436  BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2437  			 csum_type, 16);
2438  BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2439  			 cache_generation, 64);
2440  BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2441  BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2442  			 uuid_tree_generation, 64);
2443  
2444  int btrfs_super_csum_size(const struct btrfs_super_block *s);
2445  const char *btrfs_super_csum_name(u16 csum_type);
2446  const char *btrfs_super_csum_driver(u16 csum_type);
2447  size_t __attribute_const__ btrfs_get_num_csums(void);
2448  
2449  
2450  /*
2451   * The leaf data grows from end-to-front in the node.
2452   * this returns the address of the start of the last item,
2453   * which is the stop of the leaf data stack
2454   */
2455  static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2456  {
2457  	u32 nr = btrfs_header_nritems(leaf);
2458  
2459  	if (nr == 0)
2460  		return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2461  	return btrfs_item_offset_nr(leaf, nr - 1);
2462  }
2463  
2464  /* struct btrfs_file_extent_item */
2465  BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2466  			 type, 8);
2467  BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2468  			 struct btrfs_file_extent_item, disk_bytenr, 64);
2469  BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2470  			 struct btrfs_file_extent_item, offset, 64);
2471  BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2472  			 struct btrfs_file_extent_item, generation, 64);
2473  BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2474  			 struct btrfs_file_extent_item, num_bytes, 64);
2475  BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2476  			 struct btrfs_file_extent_item, ram_bytes, 64);
2477  BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2478  			 struct btrfs_file_extent_item, disk_num_bytes, 64);
2479  BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2480  			 struct btrfs_file_extent_item, compression, 8);
2481  
2482  static inline unsigned long
2483  btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2484  {
2485  	return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2486  }
2487  
2488  static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2489  {
2490  	return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2491  }
2492  
2493  BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2494  BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2495  		   disk_bytenr, 64);
2496  BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2497  		   generation, 64);
2498  BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2499  		   disk_num_bytes, 64);
2500  BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2501  		  offset, 64);
2502  BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2503  		   num_bytes, 64);
2504  BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2505  		   ram_bytes, 64);
2506  BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2507  		   compression, 8);
2508  BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2509  		   encryption, 8);
2510  BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2511  		   other_encoding, 16);
2512  
2513  /*
2514   * this returns the number of bytes used by the item on disk, minus the
2515   * size of any extent headers.  If a file is compressed on disk, this is
2516   * the compressed size
2517   */
2518  static inline u32 btrfs_file_extent_inline_item_len(
2519  						const struct extent_buffer *eb,
2520  						struct btrfs_item *e)
2521  {
2522  	return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2523  }
2524  
2525  /* btrfs_qgroup_status_item */
2526  BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2527  		   generation, 64);
2528  BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2529  		   version, 64);
2530  BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2531  		   flags, 64);
2532  BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2533  		   rescan, 64);
2534  
2535  /* btrfs_qgroup_info_item */
2536  BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2537  		   generation, 64);
2538  BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2539  BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2540  		   rfer_cmpr, 64);
2541  BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2542  BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2543  		   excl_cmpr, 64);
2544  
2545  BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2546  			 struct btrfs_qgroup_info_item, generation, 64);
2547  BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2548  			 rfer, 64);
2549  BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2550  			 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2551  BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2552  			 excl, 64);
2553  BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2554  			 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2555  
2556  /* btrfs_qgroup_limit_item */
2557  BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2558  		   flags, 64);
2559  BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2560  		   max_rfer, 64);
2561  BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2562  		   max_excl, 64);
2563  BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2564  		   rsv_rfer, 64);
2565  BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2566  		   rsv_excl, 64);
2567  
2568  /* btrfs_dev_replace_item */
2569  BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2570  		   struct btrfs_dev_replace_item, src_devid, 64);
2571  BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2572  		   struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2573  		   64);
2574  BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2575  		   replace_state, 64);
2576  BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2577  		   time_started, 64);
2578  BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2579  		   time_stopped, 64);
2580  BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2581  		   num_write_errors, 64);
2582  BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2583  		   struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2584  		   64);
2585  BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2586  		   cursor_left, 64);
2587  BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2588  		   cursor_right, 64);
2589  
2590  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2591  			 struct btrfs_dev_replace_item, src_devid, 64);
2592  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2593  			 struct btrfs_dev_replace_item,
2594  			 cont_reading_from_srcdev_mode, 64);
2595  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2596  			 struct btrfs_dev_replace_item, replace_state, 64);
2597  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2598  			 struct btrfs_dev_replace_item, time_started, 64);
2599  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2600  			 struct btrfs_dev_replace_item, time_stopped, 64);
2601  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2602  			 struct btrfs_dev_replace_item, num_write_errors, 64);
2603  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2604  			 struct btrfs_dev_replace_item,
2605  			 num_uncorrectable_read_errors, 64);
2606  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2607  			 struct btrfs_dev_replace_item, cursor_left, 64);
2608  BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2609  			 struct btrfs_dev_replace_item, cursor_right, 64);
2610  
2611  /* helper function to cast into the data area of the leaf. */
2612  #define btrfs_item_ptr(leaf, slot, type) \
2613  	((type *)(BTRFS_LEAF_DATA_OFFSET + \
2614  	btrfs_item_offset_nr(leaf, slot)))
2615  
2616  #define btrfs_item_ptr_offset(leaf, slot) \
2617  	((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2618  	btrfs_item_offset_nr(leaf, slot)))
2619  
2620  static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2621  {
2622  	return crc32c(crc, address, length);
2623  }
2624  
2625  static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2626  {
2627  	put_unaligned_le32(~crc, result);
2628  }
2629  
2630  static inline u64 btrfs_name_hash(const char *name, int len)
2631  {
2632         return crc32c((u32)~1, name, len);
2633  }
2634  
2635  /*
2636   * Figure the key offset of an extended inode ref
2637   */
2638  static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2639                                     int len)
2640  {
2641         return (u64) crc32c(parent_objectid, name, len);
2642  }
2643  
2644  static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2645  {
2646  	return mapping_gfp_constraint(mapping, ~__GFP_FS);
2647  }
2648  
2649  /* extent-tree.c */
2650  
2651  enum btrfs_inline_ref_type {
2652  	BTRFS_REF_TYPE_INVALID,
2653  	BTRFS_REF_TYPE_BLOCK,
2654  	BTRFS_REF_TYPE_DATA,
2655  	BTRFS_REF_TYPE_ANY,
2656  };
2657  
2658  int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2659  				     struct btrfs_extent_inline_ref *iref,
2660  				     enum btrfs_inline_ref_type is_data);
2661  u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2662  
2663  /*
2664   * Take the number of bytes to be checksummmed and figure out how many leaves
2665   * it would require to store the csums for that many bytes.
2666   */
2667  static inline u64 btrfs_csum_bytes_to_leaves(
2668  			const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2669  {
2670  	const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2671  
2672  	return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2673  }
2674  
2675  /*
2676   * Use this if we would be adding new items, as we could split nodes as we cow
2677   * down the tree.
2678   */
2679  static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2680  						  unsigned num_items)
2681  {
2682  	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2683  }
2684  
2685  /*
2686   * Doing a truncate or a modification won't result in new nodes or leaves, just
2687   * what we need for COW.
2688   */
2689  static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2690  						 unsigned num_items)
2691  {
2692  	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2693  }
2694  
2695  int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2696  			      u64 start, u64 num_bytes);
2697  void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2698  int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2699  			   unsigned long count);
2700  void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2701  				  struct btrfs_delayed_ref_root *delayed_refs,
2702  				  struct btrfs_delayed_ref_head *head);
2703  int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2704  int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2705  			     struct btrfs_fs_info *fs_info, u64 bytenr,
2706  			     u64 offset, int metadata, u64 *refs, u64 *flags);
2707  int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2708  		     int reserved);
2709  int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2710  				    u64 bytenr, u64 num_bytes);
2711  int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2712  int btrfs_cross_ref_exist(struct btrfs_root *root,
2713  			  u64 objectid, u64 offset, u64 bytenr, bool strict);
2714  struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2715  					     struct btrfs_root *root,
2716  					     u64 parent, u64 root_objectid,
2717  					     const struct btrfs_disk_key *key,
2718  					     int level, u64 hint,
2719  					     u64 empty_size,
2720  					     enum btrfs_lock_nesting nest);
2721  void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2722  			   struct btrfs_root *root,
2723  			   struct extent_buffer *buf,
2724  			   u64 parent, int last_ref);
2725  int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2726  				     struct btrfs_root *root, u64 owner,
2727  				     u64 offset, u64 ram_bytes,
2728  				     struct btrfs_key *ins);
2729  int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2730  				   u64 root_objectid, u64 owner, u64 offset,
2731  				   struct btrfs_key *ins);
2732  int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2733  			 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2734  			 struct btrfs_key *ins, int is_data, int delalloc);
2735  int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2736  		  struct extent_buffer *buf, int full_backref);
2737  int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2738  		  struct extent_buffer *buf, int full_backref);
2739  int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2740  				struct extent_buffer *eb, u64 flags,
2741  				int level, int is_data);
2742  int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2743  
2744  int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2745  			       u64 start, u64 len, int delalloc);
2746  int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2747  			      u64 len);
2748  int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2749  int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2750  			 struct btrfs_ref *generic_ref);
2751  
2752  void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2753  
2754  /*
2755   * Different levels for to flush space when doing space reservations.
2756   *
2757   * The higher the level, the more methods we try to reclaim space.
2758   */
2759  enum btrfs_reserve_flush_enum {
2760  	/* If we are in the transaction, we can't flush anything.*/
2761  	BTRFS_RESERVE_NO_FLUSH,
2762  
2763  	/*
2764  	 * Flush space by:
2765  	 * - Running delayed inode items
2766  	 * - Allocating a new chunk
2767  	 */
2768  	BTRFS_RESERVE_FLUSH_LIMIT,
2769  
2770  	/*
2771  	 * Flush space by:
2772  	 * - Running delayed inode items
2773  	 * - Running delayed refs
2774  	 * - Running delalloc and waiting for ordered extents
2775  	 * - Allocating a new chunk
2776  	 */
2777  	BTRFS_RESERVE_FLUSH_EVICT,
2778  
2779  	/*
2780  	 * Flush space by above mentioned methods and by:
2781  	 * - Running delayed iputs
2782  	 * - Committing transaction
2783  	 *
2784  	 * Can be interrupted by a fatal signal.
2785  	 */
2786  	BTRFS_RESERVE_FLUSH_DATA,
2787  	BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2788  	BTRFS_RESERVE_FLUSH_ALL,
2789  
2790  	/*
2791  	 * Pretty much the same as FLUSH_ALL, but can also steal space from
2792  	 * global rsv.
2793  	 *
2794  	 * Can be interrupted by a fatal signal.
2795  	 */
2796  	BTRFS_RESERVE_FLUSH_ALL_STEAL,
2797  };
2798  
2799  enum btrfs_flush_state {
2800  	FLUSH_DELAYED_ITEMS_NR	=	1,
2801  	FLUSH_DELAYED_ITEMS	=	2,
2802  	FLUSH_DELAYED_REFS_NR	=	3,
2803  	FLUSH_DELAYED_REFS	=	4,
2804  	FLUSH_DELALLOC		=	5,
2805  	FLUSH_DELALLOC_WAIT	=	6,
2806  	FLUSH_DELALLOC_FULL	=	7,
2807  	ALLOC_CHUNK		=	8,
2808  	ALLOC_CHUNK_FORCE	=	9,
2809  	RUN_DELAYED_IPUTS	=	10,
2810  	COMMIT_TRANS		=	11,
2811  };
2812  
2813  int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2814  				     struct btrfs_block_rsv *rsv,
2815  				     int nitems, bool use_global_rsv);
2816  void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2817  				      struct btrfs_block_rsv *rsv);
2818  void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2819  
2820  int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2821  u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2822  int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2823  				   u64 start, u64 end);
2824  int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2825  			 u64 num_bytes, u64 *actual_bytes);
2826  int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2827  
2828  int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2829  int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2830  					 struct btrfs_fs_info *fs_info);
2831  int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2832  void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2833  void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2834  
2835  /* ctree.c */
2836  int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2837  		     int *slot);
2838  int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2839  int btrfs_previous_item(struct btrfs_root *root,
2840  			struct btrfs_path *path, u64 min_objectid,
2841  			int type);
2842  int btrfs_previous_extent_item(struct btrfs_root *root,
2843  			struct btrfs_path *path, u64 min_objectid);
2844  void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2845  			     struct btrfs_path *path,
2846  			     const struct btrfs_key *new_key);
2847  struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2848  int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2849  			struct btrfs_key *key, int lowest_level,
2850  			u64 min_trans);
2851  int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2852  			 struct btrfs_path *path,
2853  			 u64 min_trans);
2854  struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2855  					   int slot);
2856  
2857  int btrfs_cow_block(struct btrfs_trans_handle *trans,
2858  		    struct btrfs_root *root, struct extent_buffer *buf,
2859  		    struct extent_buffer *parent, int parent_slot,
2860  		    struct extent_buffer **cow_ret,
2861  		    enum btrfs_lock_nesting nest);
2862  int btrfs_copy_root(struct btrfs_trans_handle *trans,
2863  		      struct btrfs_root *root,
2864  		      struct extent_buffer *buf,
2865  		      struct extent_buffer **cow_ret, u64 new_root_objectid);
2866  int btrfs_block_can_be_shared(struct btrfs_root *root,
2867  			      struct extent_buffer *buf);
2868  void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2869  void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2870  int btrfs_split_item(struct btrfs_trans_handle *trans,
2871  		     struct btrfs_root *root,
2872  		     struct btrfs_path *path,
2873  		     const struct btrfs_key *new_key,
2874  		     unsigned long split_offset);
2875  int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2876  			 struct btrfs_root *root,
2877  			 struct btrfs_path *path,
2878  			 const struct btrfs_key *new_key);
2879  int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2880  		u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2881  int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2882  		      const struct btrfs_key *key, struct btrfs_path *p,
2883  		      int ins_len, int cow);
2884  int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2885  			  struct btrfs_path *p, u64 time_seq);
2886  int btrfs_search_slot_for_read(struct btrfs_root *root,
2887  			       const struct btrfs_key *key,
2888  			       struct btrfs_path *p, int find_higher,
2889  			       int return_any);
2890  int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2891  		       struct btrfs_root *root, struct extent_buffer *parent,
2892  		       int start_slot, u64 *last_ret,
2893  		       struct btrfs_key *progress);
2894  void btrfs_release_path(struct btrfs_path *p);
2895  struct btrfs_path *btrfs_alloc_path(void);
2896  void btrfs_free_path(struct btrfs_path *p);
2897  
2898  int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2899  		   struct btrfs_path *path, int slot, int nr);
2900  static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2901  				 struct btrfs_root *root,
2902  				 struct btrfs_path *path)
2903  {
2904  	return btrfs_del_items(trans, root, path, path->slots[0], 1);
2905  }
2906  
2907  /*
2908   * Describes a batch of items to insert in a btree. This is used by
2909   * btrfs_insert_empty_items().
2910   */
2911  struct btrfs_item_batch {
2912  	/*
2913  	 * Pointer to an array containing the keys of the items to insert (in
2914  	 * sorted order).
2915  	 */
2916  	const struct btrfs_key *keys;
2917  	/* Pointer to an array containing the data size for each item to insert. */
2918  	const u32 *data_sizes;
2919  	/*
2920  	 * The sum of data sizes for all items. The caller can compute this while
2921  	 * setting up the data_sizes array, so it ends up being more efficient
2922  	 * than having btrfs_insert_empty_items() or setup_item_for_insert()
2923  	 * doing it, as it would avoid an extra loop over a potentially large
2924  	 * array, and in the case of setup_item_for_insert(), we would be doing
2925  	 * it while holding a write lock on a leaf and often on upper level nodes
2926  	 * too, unnecessarily increasing the size of a critical section.
2927  	 */
2928  	u32 total_data_size;
2929  	/* Size of the keys and data_sizes arrays (number of items in the batch). */
2930  	int nr;
2931  };
2932  
2933  void btrfs_setup_item_for_insert(struct btrfs_root *root,
2934  				 struct btrfs_path *path,
2935  				 const struct btrfs_key *key,
2936  				 u32 data_size);
2937  int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2938  		      const struct btrfs_key *key, void *data, u32 data_size);
2939  int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2940  			     struct btrfs_root *root,
2941  			     struct btrfs_path *path,
2942  			     const struct btrfs_item_batch *batch);
2943  
2944  static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2945  					  struct btrfs_root *root,
2946  					  struct btrfs_path *path,
2947  					  const struct btrfs_key *key,
2948  					  u32 data_size)
2949  {
2950  	struct btrfs_item_batch batch;
2951  
2952  	batch.keys = key;
2953  	batch.data_sizes = &data_size;
2954  	batch.total_data_size = data_size;
2955  	batch.nr = 1;
2956  
2957  	return btrfs_insert_empty_items(trans, root, path, &batch);
2958  }
2959  
2960  int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2961  int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2962  			u64 time_seq);
2963  
2964  int btrfs_search_backwards(struct btrfs_root *root, struct btrfs_key *key,
2965  			   struct btrfs_path *path);
2966  
2967  static inline int btrfs_next_old_item(struct btrfs_root *root,
2968  				      struct btrfs_path *p, u64 time_seq)
2969  {
2970  	++p->slots[0];
2971  	if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2972  		return btrfs_next_old_leaf(root, p, time_seq);
2973  	return 0;
2974  }
2975  
2976  /*
2977   * Search the tree again to find a leaf with greater keys.
2978   *
2979   * Returns 0 if it found something or 1 if there are no greater leaves.
2980   * Returns < 0 on error.
2981   */
2982  static inline int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
2983  {
2984  	return btrfs_next_old_leaf(root, path, 0);
2985  }
2986  
2987  static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2988  {
2989  	return btrfs_next_old_item(root, p, 0);
2990  }
2991  int btrfs_leaf_free_space(struct extent_buffer *leaf);
2992  int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
2993  				     int for_reloc);
2994  int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2995  			struct btrfs_root *root,
2996  			struct extent_buffer *node,
2997  			struct extent_buffer *parent);
2998  static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2999  {
3000  	/*
3001  	 * Do it this way so we only ever do one test_bit in the normal case.
3002  	 */
3003  	if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
3004  		if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
3005  			return 2;
3006  		return 1;
3007  	}
3008  	return 0;
3009  }
3010  
3011  /*
3012   * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
3013   * anything except sleeping. This function is used to check the status of
3014   * the fs.
3015   * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
3016   * since setting and checking for SB_RDONLY in the superblock's flags is not
3017   * atomic.
3018   */
3019  static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
3020  {
3021  	return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
3022  		btrfs_fs_closing(fs_info);
3023  }
3024  
3025  static inline void btrfs_set_sb_rdonly(struct super_block *sb)
3026  {
3027  	sb->s_flags |= SB_RDONLY;
3028  	set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3029  }
3030  
3031  static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
3032  {
3033  	sb->s_flags &= ~SB_RDONLY;
3034  	clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
3035  }
3036  
3037  /* root-item.c */
3038  int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3039  		       u64 ref_id, u64 dirid, u64 sequence, const char *name,
3040  		       int name_len);
3041  int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
3042  		       u64 ref_id, u64 dirid, u64 *sequence, const char *name,
3043  		       int name_len);
3044  int btrfs_del_root(struct btrfs_trans_handle *trans,
3045  		   const struct btrfs_key *key);
3046  int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
3047  		      const struct btrfs_key *key,
3048  		      struct btrfs_root_item *item);
3049  int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
3050  				   struct btrfs_root *root,
3051  				   struct btrfs_key *key,
3052  				   struct btrfs_root_item *item);
3053  int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
3054  		    struct btrfs_path *path, struct btrfs_root_item *root_item,
3055  		    struct btrfs_key *root_key);
3056  int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
3057  void btrfs_set_root_node(struct btrfs_root_item *item,
3058  			 struct extent_buffer *node);
3059  void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
3060  void btrfs_update_root_times(struct btrfs_trans_handle *trans,
3061  			     struct btrfs_root *root);
3062  
3063  /* uuid-tree.c */
3064  int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3065  			u64 subid);
3066  int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
3067  			u64 subid);
3068  int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
3069  
3070  /* dir-item.c */
3071  int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
3072  			  const char *name, int name_len);
3073  int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3074  			  int name_len, struct btrfs_inode *dir,
3075  			  struct btrfs_key *location, u8 type, u64 index);
3076  struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3077  					     struct btrfs_root *root,
3078  					     struct btrfs_path *path, u64 dir,
3079  					     const char *name, int name_len,
3080  					     int mod);
3081  struct btrfs_dir_item *
3082  btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3083  			    struct btrfs_root *root,
3084  			    struct btrfs_path *path, u64 dir,
3085  			    u64 index, const char *name, int name_len,
3086  			    int mod);
3087  struct btrfs_dir_item *
3088  btrfs_search_dir_index_item(struct btrfs_root *root,
3089  			    struct btrfs_path *path, u64 dirid,
3090  			    const char *name, int name_len);
3091  int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3092  			      struct btrfs_root *root,
3093  			      struct btrfs_path *path,
3094  			      struct btrfs_dir_item *di);
3095  int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3096  			    struct btrfs_root *root,
3097  			    struct btrfs_path *path, u64 objectid,
3098  			    const char *name, u16 name_len,
3099  			    const void *data, u16 data_len);
3100  struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3101  					  struct btrfs_root *root,
3102  					  struct btrfs_path *path, u64 dir,
3103  					  const char *name, u16 name_len,
3104  					  int mod);
3105  struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3106  						 struct btrfs_path *path,
3107  						 const char *name,
3108  						 int name_len);
3109  
3110  /* orphan.c */
3111  int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3112  			     struct btrfs_root *root, u64 offset);
3113  int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3114  			  struct btrfs_root *root, u64 offset);
3115  int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3116  
3117  /* inode-item.c */
3118  int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3119  			   struct btrfs_root *root,
3120  			   const char *name, int name_len,
3121  			   u64 inode_objectid, u64 ref_objectid, u64 index);
3122  int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3123  			   struct btrfs_root *root,
3124  			   const char *name, int name_len,
3125  			   u64 inode_objectid, u64 ref_objectid, u64 *index);
3126  int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3127  			     struct btrfs_root *root,
3128  			     struct btrfs_path *path, u64 objectid);
3129  int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3130  		       *root, struct btrfs_path *path,
3131  		       struct btrfs_key *location, int mod);
3132  
3133  struct btrfs_inode_extref *
3134  btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3135  			  struct btrfs_root *root,
3136  			  struct btrfs_path *path,
3137  			  const char *name, int name_len,
3138  			  u64 inode_objectid, u64 ref_objectid, int ins_len,
3139  			  int cow);
3140  
3141  struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
3142  						   int slot, const char *name,
3143  						   int name_len);
3144  struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
3145  		struct extent_buffer *leaf, int slot, u64 ref_objectid,
3146  		const char *name, int name_len);
3147  /* file-item.c */
3148  struct btrfs_dio_private;
3149  int btrfs_del_csums(struct btrfs_trans_handle *trans,
3150  		    struct btrfs_root *root, u64 bytenr, u64 len);
3151  blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3152  int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3153  			     struct btrfs_root *root,
3154  			     u64 objectid, u64 pos,
3155  			     u64 disk_offset, u64 disk_num_bytes,
3156  			     u64 num_bytes, u64 offset, u64 ram_bytes,
3157  			     u8 compression, u8 encryption, u16 other_encoding);
3158  int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3159  			     struct btrfs_root *root,
3160  			     struct btrfs_path *path, u64 objectid,
3161  			     u64 bytenr, int mod);
3162  int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3163  			   struct btrfs_root *root,
3164  			   struct btrfs_ordered_sum *sums);
3165  blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3166  				u64 file_start, int contig);
3167  int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3168  			     struct list_head *list, int search_commit);
3169  void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3170  				     const struct btrfs_path *path,
3171  				     struct btrfs_file_extent_item *fi,
3172  				     const bool new_inline,
3173  				     struct extent_map *em);
3174  int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3175  					u64 len);
3176  int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3177  				      u64 len);
3178  void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3179  u64 btrfs_file_extent_end(const struct btrfs_path *path);
3180  
3181  /* inode.c */
3182  blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3183  				   int mirror_num, unsigned long bio_flags);
3184  unsigned int btrfs_verify_data_csum(struct btrfs_bio *bbio,
3185  				    u32 bio_offset, struct page *page,
3186  				    u64 start, u64 end);
3187  struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3188  					   u64 start, u64 len);
3189  noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3190  			      u64 *orig_start, u64 *orig_block_len,
3191  			      u64 *ram_bytes, bool strict);
3192  
3193  void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3194  				struct btrfs_inode *inode);
3195  struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3196  int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3197  int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3198  		       struct btrfs_inode *dir, struct btrfs_inode *inode,
3199  		       const char *name, int name_len);
3200  int btrfs_add_link(struct btrfs_trans_handle *trans,
3201  		   struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3202  		   const char *name, int name_len, int add_backref, u64 index);
3203  int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3204  int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3205  			 int front);
3206  int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3207  			       struct btrfs_root *root,
3208  			       struct btrfs_inode *inode, u64 new_size,
3209  			       u32 min_type, u64 *extents_found);
3210  
3211  int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3212  int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3213  			       bool in_reclaim_context);
3214  int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3215  			      unsigned int extra_bits,
3216  			      struct extent_state **cached_state);
3217  int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3218  			     struct btrfs_root *new_root,
3219  			     struct btrfs_root *parent_root,
3220  			     struct user_namespace *mnt_userns);
3221   void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3222  			       unsigned *bits);
3223  void btrfs_clear_delalloc_extent(struct inode *inode,
3224  				 struct extent_state *state, unsigned *bits);
3225  void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3226  				 struct extent_state *other);
3227  void btrfs_split_delalloc_extent(struct inode *inode,
3228  				 struct extent_state *orig, u64 split);
3229  void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3230  vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3231  int btrfs_readpage(struct file *file, struct page *page);
3232  void btrfs_evict_inode(struct inode *inode);
3233  int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3234  struct inode *btrfs_alloc_inode(struct super_block *sb);
3235  void btrfs_destroy_inode(struct inode *inode);
3236  void btrfs_free_inode(struct inode *inode);
3237  int btrfs_drop_inode(struct inode *inode);
3238  int __init btrfs_init_cachep(void);
3239  void __cold btrfs_destroy_cachep(void);
3240  struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3241  			      struct btrfs_root *root, struct btrfs_path *path);
3242  struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3243  struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3244  				    struct page *page, size_t pg_offset,
3245  				    u64 start, u64 end);
3246  int btrfs_update_inode(struct btrfs_trans_handle *trans,
3247  		       struct btrfs_root *root, struct btrfs_inode *inode);
3248  int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3249  				struct btrfs_root *root, struct btrfs_inode *inode);
3250  int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3251  		struct btrfs_inode *inode);
3252  int btrfs_orphan_cleanup(struct btrfs_root *root);
3253  int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3254  void btrfs_add_delayed_iput(struct inode *inode);
3255  void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3256  int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3257  int btrfs_prealloc_file_range(struct inode *inode, int mode,
3258  			      u64 start, u64 num_bytes, u64 min_size,
3259  			      loff_t actual_len, u64 *alloc_hint);
3260  int btrfs_prealloc_file_range_trans(struct inode *inode,
3261  				    struct btrfs_trans_handle *trans, int mode,
3262  				    u64 start, u64 num_bytes, u64 min_size,
3263  				    loff_t actual_len, u64 *alloc_hint);
3264  int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3265  		u64 start, u64 end, int *page_started, unsigned long *nr_written,
3266  		struct writeback_control *wbc);
3267  int btrfs_writepage_cow_fixup(struct page *page);
3268  void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3269  					  struct page *page, u64 start,
3270  					  u64 end, bool uptodate);
3271  extern const struct dentry_operations btrfs_dentry_operations;
3272  extern const struct iomap_ops btrfs_dio_iomap_ops;
3273  extern const struct iomap_dio_ops btrfs_dio_ops;
3274  
3275  /* Inode locking type flags, by default the exclusive lock is taken */
3276  #define BTRFS_ILOCK_SHARED	(1U << 0)
3277  #define BTRFS_ILOCK_TRY 	(1U << 1)
3278  #define BTRFS_ILOCK_MMAP	(1U << 2)
3279  
3280  int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3281  void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3282  void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3283  			      const u64 add_bytes,
3284  			      const u64 del_bytes);
3285  
3286  /* ioctl.c */
3287  long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3288  long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3289  int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3290  int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3291  		       struct dentry *dentry, struct fileattr *fa);
3292  int btrfs_ioctl_get_supported_features(void __user *arg);
3293  void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3294  int __pure btrfs_is_empty_uuid(u8 *uuid);
3295  int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
3296  		      struct btrfs_ioctl_defrag_range_args *range,
3297  		      u64 newer_than, unsigned long max_to_defrag);
3298  void btrfs_get_block_group_info(struct list_head *groups_list,
3299  				struct btrfs_ioctl_space_info *space);
3300  void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3301  			       struct btrfs_ioctl_balance_args *bargs);
3302  bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3303  			enum btrfs_exclusive_operation type);
3304  bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3305  				 enum btrfs_exclusive_operation type);
3306  void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3307  void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3308  
3309  /* file.c */
3310  int __init btrfs_auto_defrag_init(void);
3311  void __cold btrfs_auto_defrag_exit(void);
3312  int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3313  			   struct btrfs_inode *inode);
3314  int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3315  void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3316  int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3317  void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3318  			     int skip_pinned);
3319  extern const struct file_operations btrfs_file_operations;
3320  int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3321  		       struct btrfs_root *root, struct btrfs_inode *inode,
3322  		       struct btrfs_drop_extents_args *args);
3323  int btrfs_replace_file_extents(struct btrfs_inode *inode,
3324  			   struct btrfs_path *path, const u64 start,
3325  			   const u64 end,
3326  			   struct btrfs_replace_extent_info *extent_info,
3327  			   struct btrfs_trans_handle **trans_out);
3328  int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3329  			      struct btrfs_inode *inode, u64 start, u64 end);
3330  int btrfs_release_file(struct inode *inode, struct file *file);
3331  int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3332  		      size_t num_pages, loff_t pos, size_t write_bytes,
3333  		      struct extent_state **cached, bool noreserve);
3334  int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3335  int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3336  			   size_t *write_bytes);
3337  void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3338  
3339  /* tree-defrag.c */
3340  int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3341  			struct btrfs_root *root);
3342  
3343  /* super.c */
3344  int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3345  			unsigned long new_flags);
3346  int btrfs_sync_fs(struct super_block *sb, int wait);
3347  char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3348  					  u64 subvol_objectid);
3349  
3350  static inline __printf(2, 3) __cold
3351  void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3352  {
3353  }
3354  
3355  #ifdef CONFIG_PRINTK
3356  __printf(2, 3)
3357  __cold
3358  void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3359  #else
3360  #define btrfs_printk(fs_info, fmt, args...) \
3361  	btrfs_no_printk(fs_info, fmt, ##args)
3362  #endif
3363  
3364  #define btrfs_emerg(fs_info, fmt, args...) \
3365  	btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3366  #define btrfs_alert(fs_info, fmt, args...) \
3367  	btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3368  #define btrfs_crit(fs_info, fmt, args...) \
3369  	btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3370  #define btrfs_err(fs_info, fmt, args...) \
3371  	btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3372  #define btrfs_warn(fs_info, fmt, args...) \
3373  	btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3374  #define btrfs_notice(fs_info, fmt, args...) \
3375  	btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3376  #define btrfs_info(fs_info, fmt, args...) \
3377  	btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3378  
3379  /*
3380   * Wrappers that use printk_in_rcu
3381   */
3382  #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3383  	btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3384  #define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3385  	btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3386  #define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3387  	btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3388  #define btrfs_err_in_rcu(fs_info, fmt, args...) \
3389  	btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3390  #define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3391  	btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3392  #define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3393  	btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3394  #define btrfs_info_in_rcu(fs_info, fmt, args...) \
3395  	btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3396  
3397  /*
3398   * Wrappers that use a ratelimited printk_in_rcu
3399   */
3400  #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3401  	btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3402  #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3403  	btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3404  #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3405  	btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3406  #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3407  	btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3408  #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3409  	btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3410  #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3411  	btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3412  #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3413  	btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3414  
3415  /*
3416   * Wrappers that use a ratelimited printk
3417   */
3418  #define btrfs_emerg_rl(fs_info, fmt, args...) \
3419  	btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3420  #define btrfs_alert_rl(fs_info, fmt, args...) \
3421  	btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3422  #define btrfs_crit_rl(fs_info, fmt, args...) \
3423  	btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3424  #define btrfs_err_rl(fs_info, fmt, args...) \
3425  	btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3426  #define btrfs_warn_rl(fs_info, fmt, args...) \
3427  	btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3428  #define btrfs_notice_rl(fs_info, fmt, args...) \
3429  	btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3430  #define btrfs_info_rl(fs_info, fmt, args...) \
3431  	btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3432  
3433  #if defined(CONFIG_DYNAMIC_DEBUG)
3434  #define btrfs_debug(fs_info, fmt, args...)				\
3435  	_dynamic_func_call_no_desc(fmt, btrfs_printk,			\
3436  				   fs_info, KERN_DEBUG fmt, ##args)
3437  #define btrfs_debug_in_rcu(fs_info, fmt, args...)			\
3438  	_dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu,		\
3439  				   fs_info, KERN_DEBUG fmt, ##args)
3440  #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)			\
3441  	_dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu,		\
3442  				   fs_info, KERN_DEBUG fmt, ##args)
3443  #define btrfs_debug_rl(fs_info, fmt, args...)				\
3444  	_dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited,	\
3445  				   fs_info, KERN_DEBUG fmt, ##args)
3446  #elif defined(DEBUG)
3447  #define btrfs_debug(fs_info, fmt, args...) \
3448  	btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3449  #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3450  	btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3451  #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3452  	btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3453  #define btrfs_debug_rl(fs_info, fmt, args...) \
3454  	btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3455  #else
3456  #define btrfs_debug(fs_info, fmt, args...) \
3457  	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3458  #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3459  	btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3460  #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3461  	btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3462  #define btrfs_debug_rl(fs_info, fmt, args...) \
3463  	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3464  #endif
3465  
3466  #define btrfs_printk_in_rcu(fs_info, fmt, args...)	\
3467  do {							\
3468  	rcu_read_lock();				\
3469  	btrfs_printk(fs_info, fmt, ##args);		\
3470  	rcu_read_unlock();				\
3471  } while (0)
3472  
3473  #define btrfs_no_printk_in_rcu(fs_info, fmt, args...)	\
3474  do {							\
3475  	rcu_read_lock();				\
3476  	btrfs_no_printk(fs_info, fmt, ##args);		\
3477  	rcu_read_unlock();				\
3478  } while (0)
3479  
3480  #define btrfs_printk_ratelimited(fs_info, fmt, args...)		\
3481  do {								\
3482  	static DEFINE_RATELIMIT_STATE(_rs,			\
3483  		DEFAULT_RATELIMIT_INTERVAL,			\
3484  		DEFAULT_RATELIMIT_BURST);       		\
3485  	if (__ratelimit(&_rs))					\
3486  		btrfs_printk(fs_info, fmt, ##args);		\
3487  } while (0)
3488  
3489  #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)		\
3490  do {								\
3491  	rcu_read_lock();					\
3492  	btrfs_printk_ratelimited(fs_info, fmt, ##args);		\
3493  	rcu_read_unlock();					\
3494  } while (0)
3495  
3496  #ifdef CONFIG_BTRFS_ASSERT
3497  __cold __noreturn
3498  static inline void assertfail(const char *expr, const char *file, int line)
3499  {
3500  	pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3501  	BUG();
3502  }
3503  
3504  #define ASSERT(expr)						\
3505  	(likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3506  
3507  #else
3508  static inline void assertfail(const char *expr, const char* file, int line) { }
3509  #define ASSERT(expr)	(void)(expr)
3510  #endif
3511  
3512  #if BITS_PER_LONG == 32
3513  #define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3514  /*
3515   * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3516   * addresses of extents.
3517   *
3518   * For 4K page size it's about 10T, for 64K it's 160T.
3519   */
3520  #define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3521  void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3522  void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3523  #endif
3524  
3525  /*
3526   * Get the correct offset inside the page of extent buffer.
3527   *
3528   * @eb:		target extent buffer
3529   * @start:	offset inside the extent buffer
3530   *
3531   * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3532   */
3533  static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3534  					   unsigned long offset)
3535  {
3536  	/*
3537  	 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3538  	 * to PAGE_SIZE, thus adding it won't cause any difference.
3539  	 *
3540  	 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3541  	 * to the eb, thus we have to take the eb->start into consideration.
3542  	 */
3543  	return offset_in_page(offset + eb->start);
3544  }
3545  
3546  static inline unsigned long get_eb_page_index(unsigned long offset)
3547  {
3548  	/*
3549  	 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3550  	 *
3551  	 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3552  	 * and have ensured that all tree blocks are contained in one page,
3553  	 * thus we always get index == 0.
3554  	 */
3555  	return offset >> PAGE_SHIFT;
3556  }
3557  
3558  /*
3559   * Use that for functions that are conditionally exported for sanity tests but
3560   * otherwise static
3561   */
3562  #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3563  #define EXPORT_FOR_TESTS static
3564  #else
3565  #define EXPORT_FOR_TESTS
3566  #endif
3567  
3568  __cold
3569  static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3570  {
3571  	btrfs_err(fs_info,
3572  "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3573  }
3574  
3575  __printf(5, 6)
3576  __cold
3577  void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3578  		     unsigned int line, int errno, const char *fmt, ...);
3579  
3580  const char * __attribute_const__ btrfs_decode_error(int errno);
3581  
3582  __cold
3583  void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3584  			       const char *function,
3585  			       unsigned int line, int errno);
3586  
3587  /*
3588   * Call btrfs_abort_transaction as early as possible when an error condition is
3589   * detected, that way the exact line number is reported.
3590   */
3591  #define btrfs_abort_transaction(trans, errno)		\
3592  do {								\
3593  	/* Report first abort since mount */			\
3594  	if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,	\
3595  			&((trans)->fs_info->fs_state))) {	\
3596  		if ((errno) != -EIO && (errno) != -EROFS) {		\
3597  			WARN(1, KERN_DEBUG				\
3598  			"BTRFS: Transaction aborted (error %d)\n",	\
3599  			(errno));					\
3600  		} else {						\
3601  			btrfs_debug((trans)->fs_info,			\
3602  				    "Transaction aborted (error %d)", \
3603  				  (errno));			\
3604  		}						\
3605  	}							\
3606  	__btrfs_abort_transaction((trans), __func__,		\
3607  				  __LINE__, (errno));		\
3608  } while (0)
3609  
3610  #define btrfs_handle_fs_error(fs_info, errno, fmt, args...)		\
3611  do {								\
3612  	__btrfs_handle_fs_error((fs_info), __func__, __LINE__,	\
3613  			  (errno), fmt, ##args);		\
3614  } while (0)
3615  
3616  #define BTRFS_FS_ERROR(fs_info)	(unlikely(test_bit(BTRFS_FS_STATE_ERROR, \
3617  						   &(fs_info)->fs_state)))
3618  
3619  __printf(5, 6)
3620  __cold
3621  void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3622  		   unsigned int line, int errno, const char *fmt, ...);
3623  /*
3624   * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3625   * will panic().  Otherwise we BUG() here.
3626   */
3627  #define btrfs_panic(fs_info, errno, fmt, args...)			\
3628  do {									\
3629  	__btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args);	\
3630  	BUG();								\
3631  } while (0)
3632  
3633  
3634  /* compatibility and incompatibility defines */
3635  
3636  #define btrfs_set_fs_incompat(__fs_info, opt) \
3637  	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3638  				#opt)
3639  
3640  static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3641  					   u64 flag, const char* name)
3642  {
3643  	struct btrfs_super_block *disk_super;
3644  	u64 features;
3645  
3646  	disk_super = fs_info->super_copy;
3647  	features = btrfs_super_incompat_flags(disk_super);
3648  	if (!(features & flag)) {
3649  		spin_lock(&fs_info->super_lock);
3650  		features = btrfs_super_incompat_flags(disk_super);
3651  		if (!(features & flag)) {
3652  			features |= flag;
3653  			btrfs_set_super_incompat_flags(disk_super, features);
3654  			btrfs_info(fs_info,
3655  				"setting incompat feature flag for %s (0x%llx)",
3656  				name, flag);
3657  		}
3658  		spin_unlock(&fs_info->super_lock);
3659  	}
3660  }
3661  
3662  #define btrfs_clear_fs_incompat(__fs_info, opt) \
3663  	__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3664  				  #opt)
3665  
3666  static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3667  					     u64 flag, const char* name)
3668  {
3669  	struct btrfs_super_block *disk_super;
3670  	u64 features;
3671  
3672  	disk_super = fs_info->super_copy;
3673  	features = btrfs_super_incompat_flags(disk_super);
3674  	if (features & flag) {
3675  		spin_lock(&fs_info->super_lock);
3676  		features = btrfs_super_incompat_flags(disk_super);
3677  		if (features & flag) {
3678  			features &= ~flag;
3679  			btrfs_set_super_incompat_flags(disk_super, features);
3680  			btrfs_info(fs_info,
3681  				"clearing incompat feature flag for %s (0x%llx)",
3682  				name, flag);
3683  		}
3684  		spin_unlock(&fs_info->super_lock);
3685  	}
3686  }
3687  
3688  #define btrfs_fs_incompat(fs_info, opt) \
3689  	__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3690  
3691  static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3692  {
3693  	struct btrfs_super_block *disk_super;
3694  	disk_super = fs_info->super_copy;
3695  	return !!(btrfs_super_incompat_flags(disk_super) & flag);
3696  }
3697  
3698  #define btrfs_set_fs_compat_ro(__fs_info, opt) \
3699  	__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3700  				 #opt)
3701  
3702  static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3703  					    u64 flag, const char *name)
3704  {
3705  	struct btrfs_super_block *disk_super;
3706  	u64 features;
3707  
3708  	disk_super = fs_info->super_copy;
3709  	features = btrfs_super_compat_ro_flags(disk_super);
3710  	if (!(features & flag)) {
3711  		spin_lock(&fs_info->super_lock);
3712  		features = btrfs_super_compat_ro_flags(disk_super);
3713  		if (!(features & flag)) {
3714  			features |= flag;
3715  			btrfs_set_super_compat_ro_flags(disk_super, features);
3716  			btrfs_info(fs_info,
3717  				"setting compat-ro feature flag for %s (0x%llx)",
3718  				name, flag);
3719  		}
3720  		spin_unlock(&fs_info->super_lock);
3721  	}
3722  }
3723  
3724  #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3725  	__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3726  				   #opt)
3727  
3728  static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3729  					      u64 flag, const char *name)
3730  {
3731  	struct btrfs_super_block *disk_super;
3732  	u64 features;
3733  
3734  	disk_super = fs_info->super_copy;
3735  	features = btrfs_super_compat_ro_flags(disk_super);
3736  	if (features & flag) {
3737  		spin_lock(&fs_info->super_lock);
3738  		features = btrfs_super_compat_ro_flags(disk_super);
3739  		if (features & flag) {
3740  			features &= ~flag;
3741  			btrfs_set_super_compat_ro_flags(disk_super, features);
3742  			btrfs_info(fs_info,
3743  				"clearing compat-ro feature flag for %s (0x%llx)",
3744  				name, flag);
3745  		}
3746  		spin_unlock(&fs_info->super_lock);
3747  	}
3748  }
3749  
3750  #define btrfs_fs_compat_ro(fs_info, opt) \
3751  	__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3752  
3753  static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3754  {
3755  	struct btrfs_super_block *disk_super;
3756  	disk_super = fs_info->super_copy;
3757  	return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3758  }
3759  
3760  /* acl.c */
3761  #ifdef CONFIG_BTRFS_FS_POSIX_ACL
3762  struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu);
3763  int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3764  		  struct posix_acl *acl, int type);
3765  int btrfs_init_acl(struct btrfs_trans_handle *trans,
3766  		   struct inode *inode, struct inode *dir);
3767  #else
3768  #define btrfs_get_acl NULL
3769  #define btrfs_set_acl NULL
3770  static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3771  				 struct inode *inode, struct inode *dir)
3772  {
3773  	return 0;
3774  }
3775  #endif
3776  
3777  /* relocation.c */
3778  int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3779  int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3780  			  struct btrfs_root *root);
3781  int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3782  			    struct btrfs_root *root);
3783  int btrfs_recover_relocation(struct btrfs_root *root);
3784  int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3785  int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3786  			  struct btrfs_root *root, struct extent_buffer *buf,
3787  			  struct extent_buffer *cow);
3788  void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3789  			      u64 *bytes_to_reserve);
3790  int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3791  			      struct btrfs_pending_snapshot *pending);
3792  int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3793  struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3794  				   u64 bytenr);
3795  int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3796  
3797  /* scrub.c */
3798  int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3799  		    u64 end, struct btrfs_scrub_progress *progress,
3800  		    int readonly, int is_dev_replace);
3801  void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3802  void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3803  int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3804  int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3805  int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3806  			 struct btrfs_scrub_progress *progress);
3807  static inline void btrfs_init_full_stripe_locks_tree(
3808  			struct btrfs_full_stripe_locks_tree *locks_root)
3809  {
3810  	locks_root->root = RB_ROOT;
3811  	mutex_init(&locks_root->lock);
3812  }
3813  
3814  /* dev-replace.c */
3815  void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3816  void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3817  void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3818  
3819  static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3820  {
3821  	btrfs_bio_counter_sub(fs_info, 1);
3822  }
3823  
3824  /* reada.c */
3825  struct reada_control {
3826  	struct btrfs_fs_info	*fs_info;		/* tree to prefetch */
3827  	struct btrfs_key	key_start;
3828  	struct btrfs_key	key_end;	/* exclusive */
3829  	atomic_t		elems;
3830  	struct kref		refcnt;
3831  	wait_queue_head_t	wait;
3832  };
3833  struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3834  			      struct btrfs_key *start, struct btrfs_key *end);
3835  int btrfs_reada_wait(void *handle);
3836  void btrfs_reada_detach(void *handle);
3837  int btree_readahead_hook(struct extent_buffer *eb, int err);
3838  void btrfs_reada_remove_dev(struct btrfs_device *dev);
3839  void btrfs_reada_undo_remove_dev(struct btrfs_device *dev);
3840  
3841  static inline int is_fstree(u64 rootid)
3842  {
3843  	if (rootid == BTRFS_FS_TREE_OBJECTID ||
3844  	    ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3845  	      !btrfs_qgroup_level(rootid)))
3846  		return 1;
3847  	return 0;
3848  }
3849  
3850  static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3851  {
3852  	return signal_pending(current);
3853  }
3854  
3855  /* verity.c */
3856  #ifdef CONFIG_FS_VERITY
3857  
3858  extern const struct fsverity_operations btrfs_verityops;
3859  int btrfs_drop_verity_items(struct btrfs_inode *inode);
3860  
3861  BTRFS_SETGET_FUNCS(verity_descriptor_encryption, struct btrfs_verity_descriptor_item,
3862  		   encryption, 8);
3863  BTRFS_SETGET_FUNCS(verity_descriptor_size, struct btrfs_verity_descriptor_item,
3864  		   size, 64);
3865  BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_encryption,
3866  			 struct btrfs_verity_descriptor_item, encryption, 8);
3867  BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_size,
3868  			 struct btrfs_verity_descriptor_item, size, 64);
3869  
3870  #else
3871  
3872  static inline int btrfs_drop_verity_items(struct btrfs_inode *inode)
3873  {
3874  	return 0;
3875  }
3876  
3877  #endif
3878  
3879  /* Sanity test specific functions */
3880  #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3881  void btrfs_test_destroy_inode(struct inode *inode);
3882  static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3883  {
3884  	return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3885  }
3886  #else
3887  static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3888  {
3889  	return 0;
3890  }
3891  #endif
3892  
3893  static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
3894  {
3895  	return fs_info->zoned != 0;
3896  }
3897  
3898  static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root)
3899  {
3900  	return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;
3901  }
3902  
3903  /*
3904   * We use page status Private2 to indicate there is an ordered extent with
3905   * unfinished IO.
3906   *
3907   * Rename the Private2 accessors to Ordered, to improve readability.
3908   */
3909  #define PageOrdered(page)		PagePrivate2(page)
3910  #define SetPageOrdered(page)		SetPagePrivate2(page)
3911  #define ClearPageOrdered(page)		ClearPagePrivate2(page)
3912  
3913  #endif
3914