ctree.h revision 25c1252a
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
38struct btrfs_trans_handle;
39struct btrfs_transaction;
40struct btrfs_pending_snapshot;
41struct btrfs_delayed_ref_root;
42struct btrfs_space_info;
43struct btrfs_block_group;
44extern struct kmem_cache *btrfs_trans_handle_cachep;
45extern struct kmem_cache *btrfs_bit_radix_cachep;
46extern struct kmem_cache *btrfs_path_cachep;
47extern struct kmem_cache *btrfs_free_space_cachep;
48extern struct kmem_cache *btrfs_free_space_bitmap_cachep;
49struct btrfs_ordered_sum;
50struct btrfs_ref;
51
52#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
53
54/*
55 * Maximum number of mirrors that can be available for all profiles counting
56 * the target device of dev-replace as one. During an active device replace
57 * procedure, the target device of the copy operation is a mirror for the
58 * filesystem data as well that can be used to read data in order to repair
59 * read errors on other disks.
60 *
61 * Current value is derived from RAID1C4 with 4 copies.
62 */
63#define BTRFS_MAX_MIRRORS (4 + 1)
64
65#define BTRFS_MAX_LEVEL 8
66
67#define BTRFS_OLDEST_GENERATION	0ULL
68
69/*
70 * we can actually store much bigger names, but lets not confuse the rest
71 * of linux
72 */
73#define BTRFS_NAME_LEN 255
74
75/*
76 * Theoretical limit is larger, but we keep this down to a sane
77 * value. That should limit greatly the possibility of collisions on
78 * inode ref items.
79 */
80#define BTRFS_LINK_MAX 65535U
81
82#define BTRFS_EMPTY_DIR_SIZE 0
83
84/* ioprio of readahead is set to idle */
85#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
86
87#define BTRFS_DIRTY_METADATA_THRESH	SZ_32M
88
89/*
90 * Use large batch size to reduce overhead of metadata updates.  On the reader
91 * side, we only read it when we are close to ENOSPC and the read overhead is
92 * mostly related to the number of CPUs, so it is OK to use arbitrary large
93 * value here.
94 */
95#define BTRFS_TOTAL_BYTES_PINNED_BATCH	SZ_128M
96
97#define BTRFS_MAX_EXTENT_SIZE SZ_128M
98
99/*
100 * Deltas are an effective way to populate global statistics.  Give macro names
101 * to make it clear what we're doing.  An example is discard_extents in
102 * btrfs_free_space_ctl.
103 */
104#define BTRFS_STAT_NR_ENTRIES	2
105#define BTRFS_STAT_CURR		0
106#define BTRFS_STAT_PREV		1
107
108/*
109 * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
110 */
111static inline u32 count_max_extents(u64 size)
112{
113	return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
114}
115
116static inline unsigned long btrfs_chunk_item_size(int num_stripes)
117{
118	BUG_ON(num_stripes == 0);
119	return sizeof(struct btrfs_chunk) +
120		sizeof(struct btrfs_stripe) * (num_stripes - 1);
121}
122
123/*
124 * Runtime (in-memory) states of filesystem
125 */
126enum {
127	/* Global indicator of serious filesystem errors */
128	BTRFS_FS_STATE_ERROR,
129	/*
130	 * Filesystem is being remounted, allow to skip some operations, like
131	 * defrag
132	 */
133	BTRFS_FS_STATE_REMOUNTING,
134	/* Filesystem in RO mode */
135	BTRFS_FS_STATE_RO,
136	/* Track if a transaction abort has been reported on this filesystem */
137	BTRFS_FS_STATE_TRANS_ABORTED,
138	/*
139	 * Bio operations should be blocked on this filesystem because a source
140	 * or target device is being destroyed as part of a device replace
141	 */
142	BTRFS_FS_STATE_DEV_REPLACING,
143	/* The btrfs_fs_info created for self-tests */
144	BTRFS_FS_STATE_DUMMY_FS_INFO,
145};
146
147#define BTRFS_BACKREF_REV_MAX		256
148#define BTRFS_BACKREF_REV_SHIFT		56
149#define BTRFS_BACKREF_REV_MASK		(((u64)BTRFS_BACKREF_REV_MAX - 1) << \
150					 BTRFS_BACKREF_REV_SHIFT)
151
152#define BTRFS_OLD_BACKREF_REV		0
153#define BTRFS_MIXED_BACKREF_REV		1
154
155/*
156 * every tree block (leaf or node) starts with this header.
157 */
158struct btrfs_header {
159	/* these first four must match the super block */
160	u8 csum[BTRFS_CSUM_SIZE];
161	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
162	__le64 bytenr; /* which block this node is supposed to live in */
163	__le64 flags;
164
165	/* allowed to be different from the super from here on down */
166	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
167	__le64 generation;
168	__le64 owner;
169	__le32 nritems;
170	u8 level;
171} __attribute__ ((__packed__));
172
173/*
174 * this is a very generous portion of the super block, giving us
175 * room to translate 14 chunks with 3 stripes each.
176 */
177#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
178
179/*
180 * just in case we somehow lose the roots and are not able to mount,
181 * we store an array of the roots from previous transactions
182 * in the super.
183 */
184#define BTRFS_NUM_BACKUP_ROOTS 4
185struct btrfs_root_backup {
186	__le64 tree_root;
187	__le64 tree_root_gen;
188
189	__le64 chunk_root;
190	__le64 chunk_root_gen;
191
192	__le64 extent_root;
193	__le64 extent_root_gen;
194
195	__le64 fs_root;
196	__le64 fs_root_gen;
197
198	__le64 dev_root;
199	__le64 dev_root_gen;
200
201	__le64 csum_root;
202	__le64 csum_root_gen;
203
204	__le64 total_bytes;
205	__le64 bytes_used;
206	__le64 num_devices;
207	/* future */
208	__le64 unused_64[4];
209
210	u8 tree_root_level;
211	u8 chunk_root_level;
212	u8 extent_root_level;
213	u8 fs_root_level;
214	u8 dev_root_level;
215	u8 csum_root_level;
216	/* future and to align */
217	u8 unused_8[10];
218} __attribute__ ((__packed__));
219
220/*
221 * the super block basically lists the main trees of the FS
222 * it currently lacks any block count etc etc
223 */
224struct btrfs_super_block {
225	/* the first 4 fields must match struct btrfs_header */
226	u8 csum[BTRFS_CSUM_SIZE];
227	/* FS specific UUID, visible to user */
228	u8 fsid[BTRFS_FSID_SIZE];
229	__le64 bytenr; /* this block number */
230	__le64 flags;
231
232	/* allowed to be different from the btrfs_header from here own down */
233	__le64 magic;
234	__le64 generation;
235	__le64 root;
236	__le64 chunk_root;
237	__le64 log_root;
238
239	/* this will help find the new super based on the log root */
240	__le64 log_root_transid;
241	__le64 total_bytes;
242	__le64 bytes_used;
243	__le64 root_dir_objectid;
244	__le64 num_devices;
245	__le32 sectorsize;
246	__le32 nodesize;
247	__le32 __unused_leafsize;
248	__le32 stripesize;
249	__le32 sys_chunk_array_size;
250	__le64 chunk_root_generation;
251	__le64 compat_flags;
252	__le64 compat_ro_flags;
253	__le64 incompat_flags;
254	__le16 csum_type;
255	u8 root_level;
256	u8 chunk_root_level;
257	u8 log_root_level;
258	struct btrfs_dev_item dev_item;
259
260	char label[BTRFS_LABEL_SIZE];
261
262	__le64 cache_generation;
263	__le64 uuid_tree_generation;
264
265	/* the UUID written into btree blocks */
266	u8 metadata_uuid[BTRFS_FSID_SIZE];
267
268	/* future expansion */
269	__le64 reserved[28];
270	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
271	struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
272} __attribute__ ((__packed__));
273
274/*
275 * Compat flags that we support.  If any incompat flags are set other than the
276 * ones specified below then we will fail to mount
277 */
278#define BTRFS_FEATURE_COMPAT_SUPP		0ULL
279#define BTRFS_FEATURE_COMPAT_SAFE_SET		0ULL
280#define BTRFS_FEATURE_COMPAT_SAFE_CLEAR		0ULL
281
282#define BTRFS_FEATURE_COMPAT_RO_SUPP			\
283	(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |	\
284	 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
285
286#define BTRFS_FEATURE_COMPAT_RO_SAFE_SET	0ULL
287#define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR	0ULL
288
289#define BTRFS_FEATURE_INCOMPAT_SUPP			\
290	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |		\
291	 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |	\
292	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
293	 BTRFS_FEATURE_INCOMPAT_BIG_METADATA |		\
294	 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |		\
295	 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |		\
296	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
297	 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
298	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
299	 BTRFS_FEATURE_INCOMPAT_NO_HOLES	|	\
300	 BTRFS_FEATURE_INCOMPAT_METADATA_UUID	|	\
301	 BTRFS_FEATURE_INCOMPAT_RAID1C34	|	\
302	 BTRFS_FEATURE_INCOMPAT_ZONED)
303
304#define BTRFS_FEATURE_INCOMPAT_SAFE_SET			\
305	(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
306#define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR		0ULL
307
308/*
309 * A leaf is full of items. offset and size tell us where to find
310 * the item in the leaf (relative to the start of the data area)
311 */
312struct btrfs_item {
313	struct btrfs_disk_key key;
314	__le32 offset;
315	__le32 size;
316} __attribute__ ((__packed__));
317
318/*
319 * leaves have an item area and a data area:
320 * [item0, item1....itemN] [free space] [dataN...data1, data0]
321 *
322 * The data is separate from the items to get the keys closer together
323 * during searches.
324 */
325struct btrfs_leaf {
326	struct btrfs_header header;
327	struct btrfs_item items[];
328} __attribute__ ((__packed__));
329
330/*
331 * all non-leaf blocks are nodes, they hold only keys and pointers to
332 * other blocks
333 */
334struct btrfs_key_ptr {
335	struct btrfs_disk_key key;
336	__le64 blockptr;
337	__le64 generation;
338} __attribute__ ((__packed__));
339
340struct btrfs_node {
341	struct btrfs_header header;
342	struct btrfs_key_ptr ptrs[];
343} __attribute__ ((__packed__));
344
345/* Read ahead values for struct btrfs_path.reada */
346enum {
347	READA_NONE,
348	READA_BACK,
349	READA_FORWARD,
350	/*
351	 * Similar to READA_FORWARD but unlike it:
352	 *
353	 * 1) It will trigger readahead even for leaves that are not close to
354	 *    each other on disk;
355	 * 2) It also triggers readahead for nodes;
356	 * 3) During a search, even when a node or leaf is already in memory, it
357	 *    will still trigger readahead for other nodes and leaves that follow
358	 *    it.
359	 *
360	 * This is meant to be used only when we know we are iterating over the
361	 * entire tree or a very large part of it.
362	 */
363	READA_FORWARD_ALWAYS,
364};
365
366/*
367 * btrfs_paths remember the path taken from the root down to the leaf.
368 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
369 * to any other levels that are present.
370 *
371 * The slots array records the index of the item or block pointer
372 * used while walking the tree.
373 */
374struct btrfs_path {
375	struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
376	int slots[BTRFS_MAX_LEVEL];
377	/* if there is real range locking, this locks field will change */
378	u8 locks[BTRFS_MAX_LEVEL];
379	u8 reada;
380	/* keep some upper locks as we walk down */
381	u8 lowest_level;
382
383	/*
384	 * set by btrfs_split_item, tells search_slot to keep all locks
385	 * and to force calls to keep space in the nodes
386	 */
387	unsigned int search_for_split:1;
388	unsigned int keep_locks:1;
389	unsigned int skip_locking:1;
390	unsigned int search_commit_root:1;
391	unsigned int need_commit_sem:1;
392	unsigned int skip_release_on_error:1;
393	/*
394	 * Indicate that new item (btrfs_search_slot) is extending already
395	 * existing item and ins_len contains only the data size and not item
396	 * header (ie. sizeof(struct btrfs_item) is not included).
397	 */
398	unsigned int search_for_extension:1;
399};
400#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
401					sizeof(struct btrfs_item))
402struct btrfs_dev_replace {
403	u64 replace_state;	/* see #define above */
404	time64_t time_started;	/* seconds since 1-Jan-1970 */
405	time64_t time_stopped;	/* seconds since 1-Jan-1970 */
406	atomic64_t num_write_errors;
407	atomic64_t num_uncorrectable_read_errors;
408
409	u64 cursor_left;
410	u64 committed_cursor_left;
411	u64 cursor_left_last_write_of_item;
412	u64 cursor_right;
413
414	u64 cont_reading_from_srcdev_mode;	/* see #define above */
415
416	int is_valid;
417	int item_needs_writeback;
418	struct btrfs_device *srcdev;
419	struct btrfs_device *tgtdev;
420
421	struct mutex lock_finishing_cancel_unmount;
422	struct rw_semaphore rwsem;
423
424	struct btrfs_scrub_progress scrub_progress;
425
426	struct percpu_counter bio_counter;
427	wait_queue_head_t replace_wait;
428};
429
430/*
431 * free clusters are used to claim free space in relatively large chunks,
432 * allowing us to do less seeky writes. They are used for all metadata
433 * allocations. In ssd_spread mode they are also used for data allocations.
434 */
435struct btrfs_free_cluster {
436	spinlock_t lock;
437	spinlock_t refill_lock;
438	struct rb_root root;
439
440	/* largest extent in this cluster */
441	u64 max_size;
442
443	/* first extent starting offset */
444	u64 window_start;
445
446	/* We did a full search and couldn't create a cluster */
447	bool fragmented;
448
449	struct btrfs_block_group *block_group;
450	/*
451	 * when a cluster is allocated from a block group, we put the
452	 * cluster onto a list in the block group so that it can
453	 * be freed before the block group is freed.
454	 */
455	struct list_head block_group_list;
456};
457
458enum btrfs_caching_type {
459	BTRFS_CACHE_NO,
460	BTRFS_CACHE_STARTED,
461	BTRFS_CACHE_FAST,
462	BTRFS_CACHE_FINISHED,
463	BTRFS_CACHE_ERROR,
464};
465
466/*
467 * Tree to record all locked full stripes of a RAID5/6 block group
468 */
469struct btrfs_full_stripe_locks_tree {
470	struct rb_root root;
471	struct mutex lock;
472};
473
474/* Discard control. */
475/*
476 * Async discard uses multiple lists to differentiate the discard filter
477 * parameters.  Index 0 is for completely free block groups where we need to
478 * ensure the entire block group is trimmed without being lossy.  Indices
479 * afterwards represent monotonically decreasing discard filter sizes to
480 * prioritize what should be discarded next.
481 */
482#define BTRFS_NR_DISCARD_LISTS		3
483#define BTRFS_DISCARD_INDEX_UNUSED	0
484#define BTRFS_DISCARD_INDEX_START	1
485
486struct btrfs_discard_ctl {
487	struct workqueue_struct *discard_workers;
488	struct delayed_work work;
489	spinlock_t lock;
490	struct btrfs_block_group *block_group;
491	struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
492	u64 prev_discard;
493	u64 prev_discard_time;
494	atomic_t discardable_extents;
495	atomic64_t discardable_bytes;
496	u64 max_discard_size;
497	u64 delay_ms;
498	u32 iops_limit;
499	u32 kbps_limit;
500	u64 discard_extent_bytes;
501	u64 discard_bitmap_bytes;
502	atomic64_t discard_bytes_saved;
503};
504
505enum btrfs_orphan_cleanup_state {
506	ORPHAN_CLEANUP_STARTED	= 1,
507	ORPHAN_CLEANUP_DONE	= 2,
508};
509
510void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info);
511
512/* fs_info */
513struct reloc_control;
514struct btrfs_device;
515struct btrfs_fs_devices;
516struct btrfs_balance_control;
517struct btrfs_delayed_root;
518
519/*
520 * Block group or device which contains an active swapfile. Used for preventing
521 * unsafe operations while a swapfile is active.
522 *
523 * These are sorted on (ptr, inode) (note that a block group or device can
524 * contain more than one swapfile). We compare the pointer values because we
525 * don't actually care what the object is, we just need a quick check whether
526 * the object exists in the rbtree.
527 */
528struct btrfs_swapfile_pin {
529	struct rb_node node;
530	void *ptr;
531	struct inode *inode;
532	/*
533	 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr
534	 * points to a struct btrfs_device.
535	 */
536	bool is_block_group;
537	/*
538	 * Only used when 'is_block_group' is true and it is the number of
539	 * extents used by a swapfile for this block group ('ptr' field).
540	 */
541	int bg_extent_count;
542};
543
544bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
545
546enum {
547	BTRFS_FS_BARRIER,
548	BTRFS_FS_CLOSING_START,
549	BTRFS_FS_CLOSING_DONE,
550	BTRFS_FS_LOG_RECOVERING,
551	BTRFS_FS_OPEN,
552	BTRFS_FS_QUOTA_ENABLED,
553	BTRFS_FS_UPDATE_UUID_TREE_GEN,
554	BTRFS_FS_CREATING_FREE_SPACE_TREE,
555	BTRFS_FS_BTREE_ERR,
556	BTRFS_FS_LOG1_ERR,
557	BTRFS_FS_LOG2_ERR,
558	BTRFS_FS_QUOTA_OVERRIDE,
559	/* Used to record internally whether fs has been frozen */
560	BTRFS_FS_FROZEN,
561	/*
562	 * Indicate that balance has been set up from the ioctl and is in the
563	 * main phase. The fs_info::balance_ctl is initialized.
564	 */
565	BTRFS_FS_BALANCE_RUNNING,
566
567	/*
568	 * Indicate that relocation of a chunk has started, it's set per chunk
569	 * and is toggled between chunks.
570	 * Set, tested and cleared while holding fs_info::send_reloc_lock.
571	 */
572	BTRFS_FS_RELOC_RUNNING,
573
574	/* Indicate that the cleaner thread is awake and doing something. */
575	BTRFS_FS_CLEANER_RUNNING,
576
577	/*
578	 * The checksumming has an optimized version and is considered fast,
579	 * so we don't need to offload checksums to workqueues.
580	 */
581	BTRFS_FS_CSUM_IMPL_FAST,
582
583	/* Indicate that the discard workqueue can service discards. */
584	BTRFS_FS_DISCARD_RUNNING,
585
586	/* Indicate that we need to cleanup space cache v1 */
587	BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
588
589	/* Indicate that we can't trust the free space tree for caching yet */
590	BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
591
592	/* Indicate whether there are any tree modification log users */
593	BTRFS_FS_TREE_MOD_LOG_USERS,
594
595#if BITS_PER_LONG == 32
596	/* Indicate if we have error/warn message printed on 32bit systems */
597	BTRFS_FS_32BIT_ERROR,
598	BTRFS_FS_32BIT_WARN,
599#endif
600};
601
602/*
603 * Exclusive operations (device replace, resize, device add/remove, balance)
604 */
605enum btrfs_exclusive_operation {
606	BTRFS_EXCLOP_NONE,
607	BTRFS_EXCLOP_BALANCE,
608	BTRFS_EXCLOP_DEV_ADD,
609	BTRFS_EXCLOP_DEV_REMOVE,
610	BTRFS_EXCLOP_DEV_REPLACE,
611	BTRFS_EXCLOP_RESIZE,
612	BTRFS_EXCLOP_SWAP_ACTIVATE,
613};
614
615struct btrfs_fs_info {
616	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
617	unsigned long flags;
618	struct btrfs_root *extent_root;
619	struct btrfs_root *tree_root;
620	struct btrfs_root *chunk_root;
621	struct btrfs_root *dev_root;
622	struct btrfs_root *fs_root;
623	struct btrfs_root *csum_root;
624	struct btrfs_root *quota_root;
625	struct btrfs_root *uuid_root;
626	struct btrfs_root *free_space_root;
627	struct btrfs_root *data_reloc_root;
628
629	/* the log root tree is a directory of all the other log roots */
630	struct btrfs_root *log_root_tree;
631
632	spinlock_t fs_roots_radix_lock;
633	struct radix_tree_root fs_roots_radix;
634
635	/* block group cache stuff */
636	spinlock_t block_group_cache_lock;
637	u64 first_logical_byte;
638	struct rb_root block_group_cache_tree;
639
640	/* keep track of unallocated space */
641	atomic64_t free_chunk_space;
642
643	/* Track ranges which are used by log trees blocks/logged data extents */
644	struct extent_io_tree excluded_extents;
645
646	/* logical->physical extent mapping */
647	struct extent_map_tree mapping_tree;
648
649	/*
650	 * block reservation for extent, checksum, root tree and
651	 * delayed dir index item
652	 */
653	struct btrfs_block_rsv global_block_rsv;
654	/* block reservation for metadata operations */
655	struct btrfs_block_rsv trans_block_rsv;
656	/* block reservation for chunk tree */
657	struct btrfs_block_rsv chunk_block_rsv;
658	/* block reservation for delayed operations */
659	struct btrfs_block_rsv delayed_block_rsv;
660	/* block reservation for delayed refs */
661	struct btrfs_block_rsv delayed_refs_rsv;
662
663	struct btrfs_block_rsv empty_block_rsv;
664
665	u64 generation;
666	u64 last_trans_committed;
667	u64 avg_delayed_ref_runtime;
668
669	/*
670	 * this is updated to the current trans every time a full commit
671	 * is required instead of the faster short fsync log commits
672	 */
673	u64 last_trans_log_full_commit;
674	unsigned long mount_opt;
675	/*
676	 * Track requests for actions that need to be done during transaction
677	 * commit (like for some mount options).
678	 */
679	unsigned long pending_changes;
680	unsigned long compress_type:4;
681	unsigned int compress_level;
682	u32 commit_interval;
683	/*
684	 * It is a suggestive number, the read side is safe even it gets a
685	 * wrong number because we will write out the data into a regular
686	 * extent. The write side(mount/remount) is under ->s_umount lock,
687	 * so it is also safe.
688	 */
689	u64 max_inline;
690
691	struct btrfs_transaction *running_transaction;
692	wait_queue_head_t transaction_throttle;
693	wait_queue_head_t transaction_wait;
694	wait_queue_head_t transaction_blocked_wait;
695	wait_queue_head_t async_submit_wait;
696
697	/*
698	 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
699	 * when they are updated.
700	 *
701	 * Because we do not clear the flags for ever, so we needn't use
702	 * the lock on the read side.
703	 *
704	 * We also needn't use the lock when we mount the fs, because
705	 * there is no other task which will update the flag.
706	 */
707	spinlock_t super_lock;
708	struct btrfs_super_block *super_copy;
709	struct btrfs_super_block *super_for_commit;
710	struct super_block *sb;
711	struct inode *btree_inode;
712	struct mutex tree_log_mutex;
713	struct mutex transaction_kthread_mutex;
714	struct mutex cleaner_mutex;
715	struct mutex chunk_mutex;
716
717	/*
718	 * this is taken to make sure we don't set block groups ro after
719	 * the free space cache has been allocated on them
720	 */
721	struct mutex ro_block_group_mutex;
722
723	/* this is used during read/modify/write to make sure
724	 * no two ios are trying to mod the same stripe at the same
725	 * time
726	 */
727	struct btrfs_stripe_hash_table *stripe_hash_table;
728
729	/*
730	 * this protects the ordered operations list only while we are
731	 * processing all of the entries on it.  This way we make
732	 * sure the commit code doesn't find the list temporarily empty
733	 * because another function happens to be doing non-waiting preflush
734	 * before jumping into the main commit.
735	 */
736	struct mutex ordered_operations_mutex;
737
738	struct rw_semaphore commit_root_sem;
739
740	struct rw_semaphore cleanup_work_sem;
741
742	struct rw_semaphore subvol_sem;
743
744	spinlock_t trans_lock;
745	/*
746	 * the reloc mutex goes with the trans lock, it is taken
747	 * during commit to protect us from the relocation code
748	 */
749	struct mutex reloc_mutex;
750
751	struct list_head trans_list;
752	struct list_head dead_roots;
753	struct list_head caching_block_groups;
754
755	spinlock_t delayed_iput_lock;
756	struct list_head delayed_iputs;
757	atomic_t nr_delayed_iputs;
758	wait_queue_head_t delayed_iputs_wait;
759
760	atomic64_t tree_mod_seq;
761
762	/* this protects tree_mod_log and tree_mod_seq_list */
763	rwlock_t tree_mod_log_lock;
764	struct rb_root tree_mod_log;
765	struct list_head tree_mod_seq_list;
766
767	atomic_t async_delalloc_pages;
768
769	/*
770	 * this is used to protect the following list -- ordered_roots.
771	 */
772	spinlock_t ordered_root_lock;
773
774	/*
775	 * all fs/file tree roots in which there are data=ordered extents
776	 * pending writeback are added into this list.
777	 *
778	 * these can span multiple transactions and basically include
779	 * every dirty data page that isn't from nodatacow
780	 */
781	struct list_head ordered_roots;
782
783	struct mutex delalloc_root_mutex;
784	spinlock_t delalloc_root_lock;
785	/* all fs/file tree roots that have delalloc inodes. */
786	struct list_head delalloc_roots;
787
788	/*
789	 * there is a pool of worker threads for checksumming during writes
790	 * and a pool for checksumming after reads.  This is because readers
791	 * can run with FS locks held, and the writers may be waiting for
792	 * those locks.  We don't want ordering in the pending list to cause
793	 * deadlocks, and so the two are serviced separately.
794	 *
795	 * A third pool does submit_bio to avoid deadlocking with the other
796	 * two
797	 */
798	struct btrfs_workqueue *workers;
799	struct btrfs_workqueue *delalloc_workers;
800	struct btrfs_workqueue *flush_workers;
801	struct btrfs_workqueue *endio_workers;
802	struct btrfs_workqueue *endio_meta_workers;
803	struct btrfs_workqueue *endio_raid56_workers;
804	struct btrfs_workqueue *rmw_workers;
805	struct btrfs_workqueue *endio_meta_write_workers;
806	struct btrfs_workqueue *endio_write_workers;
807	struct btrfs_workqueue *endio_freespace_worker;
808	struct btrfs_workqueue *caching_workers;
809	struct btrfs_workqueue *readahead_workers;
810
811	/*
812	 * fixup workers take dirty pages that didn't properly go through
813	 * the cow mechanism and make them safe to write.  It happens
814	 * for the sys_munmap function call path
815	 */
816	struct btrfs_workqueue *fixup_workers;
817	struct btrfs_workqueue *delayed_workers;
818
819	struct task_struct *transaction_kthread;
820	struct task_struct *cleaner_kthread;
821	u32 thread_pool_size;
822
823	struct kobject *space_info_kobj;
824	struct kobject *qgroups_kobj;
825
826	/* used to keep from writing metadata until there is a nice batch */
827	struct percpu_counter dirty_metadata_bytes;
828	struct percpu_counter delalloc_bytes;
829	struct percpu_counter ordered_bytes;
830	s32 dirty_metadata_batch;
831	s32 delalloc_batch;
832
833	struct list_head dirty_cowonly_roots;
834
835	struct btrfs_fs_devices *fs_devices;
836
837	/*
838	 * The space_info list is effectively read only after initial
839	 * setup.  It is populated at mount time and cleaned up after
840	 * all block groups are removed.  RCU is used to protect it.
841	 */
842	struct list_head space_info;
843
844	struct btrfs_space_info *data_sinfo;
845
846	struct reloc_control *reloc_ctl;
847
848	/* data_alloc_cluster is only used in ssd_spread mode */
849	struct btrfs_free_cluster data_alloc_cluster;
850
851	/* all metadata allocations go through this cluster */
852	struct btrfs_free_cluster meta_alloc_cluster;
853
854	/* auto defrag inodes go here */
855	spinlock_t defrag_inodes_lock;
856	struct rb_root defrag_inodes;
857	atomic_t defrag_running;
858
859	/* Used to protect avail_{data, metadata, system}_alloc_bits */
860	seqlock_t profiles_lock;
861	/*
862	 * these three are in extended format (availability of single
863	 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
864	 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
865	 */
866	u64 avail_data_alloc_bits;
867	u64 avail_metadata_alloc_bits;
868	u64 avail_system_alloc_bits;
869
870	/* restriper state */
871	spinlock_t balance_lock;
872	struct mutex balance_mutex;
873	atomic_t balance_pause_req;
874	atomic_t balance_cancel_req;
875	struct btrfs_balance_control *balance_ctl;
876	wait_queue_head_t balance_wait_q;
877
878	/* Cancellation requests for chunk relocation */
879	atomic_t reloc_cancel_req;
880
881	u32 data_chunk_allocations;
882	u32 metadata_ratio;
883
884	void *bdev_holder;
885
886	/* private scrub information */
887	struct mutex scrub_lock;
888	atomic_t scrubs_running;
889	atomic_t scrub_pause_req;
890	atomic_t scrubs_paused;
891	atomic_t scrub_cancel_req;
892	wait_queue_head_t scrub_pause_wait;
893	/*
894	 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
895	 * running.
896	 */
897	refcount_t scrub_workers_refcnt;
898	struct btrfs_workqueue *scrub_workers;
899	struct btrfs_workqueue *scrub_wr_completion_workers;
900	struct btrfs_workqueue *scrub_parity_workers;
901
902	struct btrfs_discard_ctl discard_ctl;
903
904#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
905	u32 check_integrity_print_mask;
906#endif
907	/* is qgroup tracking in a consistent state? */
908	u64 qgroup_flags;
909
910	/* holds configuration and tracking. Protected by qgroup_lock */
911	struct rb_root qgroup_tree;
912	spinlock_t qgroup_lock;
913
914	/*
915	 * used to avoid frequently calling ulist_alloc()/ulist_free()
916	 * when doing qgroup accounting, it must be protected by qgroup_lock.
917	 */
918	struct ulist *qgroup_ulist;
919
920	/*
921	 * Protect user change for quota operations. If a transaction is needed,
922	 * it must be started before locking this lock.
923	 */
924	struct mutex qgroup_ioctl_lock;
925
926	/* list of dirty qgroups to be written at next commit */
927	struct list_head dirty_qgroups;
928
929	/* used by qgroup for an efficient tree traversal */
930	u64 qgroup_seq;
931
932	/* qgroup rescan items */
933	struct mutex qgroup_rescan_lock; /* protects the progress item */
934	struct btrfs_key qgroup_rescan_progress;
935	struct btrfs_workqueue *qgroup_rescan_workers;
936	struct completion qgroup_rescan_completion;
937	struct btrfs_work qgroup_rescan_work;
938	bool qgroup_rescan_running;	/* protected by qgroup_rescan_lock */
939
940	/* filesystem state */
941	unsigned long fs_state;
942
943	struct btrfs_delayed_root *delayed_root;
944
945	/* readahead tree */
946	spinlock_t reada_lock;
947	struct radix_tree_root reada_tree;
948
949	/* readahead works cnt */
950	atomic_t reada_works_cnt;
951
952	/* Extent buffer radix tree */
953	spinlock_t buffer_lock;
954	/* Entries are eb->start / sectorsize */
955	struct radix_tree_root buffer_radix;
956
957	/* next backup root to be overwritten */
958	int backup_root_index;
959
960	/* device replace state */
961	struct btrfs_dev_replace dev_replace;
962
963	struct semaphore uuid_tree_rescan_sem;
964
965	/* Used to reclaim the metadata space in the background. */
966	struct work_struct async_reclaim_work;
967	struct work_struct async_data_reclaim_work;
968	struct work_struct preempt_reclaim_work;
969
970	/* Reclaim partially filled block groups in the background */
971	struct work_struct reclaim_bgs_work;
972	struct list_head reclaim_bgs;
973	int bg_reclaim_threshold;
974
975	spinlock_t unused_bgs_lock;
976	struct list_head unused_bgs;
977	struct mutex unused_bg_unpin_mutex;
978	/* Protect block groups that are going to be deleted */
979	struct mutex reclaim_bgs_lock;
980
981	/* Cached block sizes */
982	u32 nodesize;
983	u32 sectorsize;
984	/* ilog2 of sectorsize, use to avoid 64bit division */
985	u32 sectorsize_bits;
986	u32 csum_size;
987	u32 csums_per_leaf;
988	u32 stripesize;
989
990	/* Block groups and devices containing active swapfiles. */
991	spinlock_t swapfile_pins_lock;
992	struct rb_root swapfile_pins;
993
994	struct crypto_shash *csum_shash;
995
996	spinlock_t send_reloc_lock;
997	/*
998	 * Number of send operations in progress.
999	 * Updated while holding fs_info::send_reloc_lock.
1000	 */
1001	int send_in_progress;
1002
1003	/* Type of exclusive operation running, protected by super_lock */
1004	enum btrfs_exclusive_operation exclusive_operation;
1005
1006	/*
1007	 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
1008	 * if the mode is enabled
1009	 */
1010	union {
1011		u64 zone_size;
1012		u64 zoned;
1013	};
1014
1015	struct mutex zoned_meta_io_lock;
1016	spinlock_t treelog_bg_lock;
1017	u64 treelog_bg;
1018
1019#ifdef CONFIG_BTRFS_FS_REF_VERIFY
1020	spinlock_t ref_verify_lock;
1021	struct rb_root block_tree;
1022#endif
1023
1024#ifdef CONFIG_BTRFS_DEBUG
1025	struct kobject *debug_kobj;
1026	struct kobject *discard_debug_kobj;
1027	struct list_head allocated_roots;
1028
1029	spinlock_t eb_leak_lock;
1030	struct list_head allocated_ebs;
1031#endif
1032};
1033
1034static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1035{
1036	return sb->s_fs_info;
1037}
1038
1039/*
1040 * The state of btrfs root
1041 */
1042enum {
1043	/*
1044	 * btrfs_record_root_in_trans is a multi-step process, and it can race
1045	 * with the balancing code.   But the race is very small, and only the
1046	 * first time the root is added to each transaction.  So IN_TRANS_SETUP
1047	 * is used to tell us when more checks are required
1048	 */
1049	BTRFS_ROOT_IN_TRANS_SETUP,
1050
1051	/*
1052	 * Set if tree blocks of this root can be shared by other roots.
1053	 * Only subvolume trees and their reloc trees have this bit set.
1054	 * Conflicts with TRACK_DIRTY bit.
1055	 *
1056	 * This affects two things:
1057	 *
1058	 * - How balance works
1059	 *   For shareable roots, we need to use reloc tree and do path
1060	 *   replacement for balance, and need various pre/post hooks for
1061	 *   snapshot creation to handle them.
1062	 *
1063	 *   While for non-shareable trees, we just simply do a tree search
1064	 *   with COW.
1065	 *
1066	 * - How dirty roots are tracked
1067	 *   For shareable roots, btrfs_record_root_in_trans() is needed to
1068	 *   track them, while non-subvolume roots have TRACK_DIRTY bit, they
1069	 *   don't need to set this manually.
1070	 */
1071	BTRFS_ROOT_SHAREABLE,
1072	BTRFS_ROOT_TRACK_DIRTY,
1073	BTRFS_ROOT_IN_RADIX,
1074	BTRFS_ROOT_ORPHAN_ITEM_INSERTED,
1075	BTRFS_ROOT_DEFRAG_RUNNING,
1076	BTRFS_ROOT_FORCE_COW,
1077	BTRFS_ROOT_MULTI_LOG_TASKS,
1078	BTRFS_ROOT_DIRTY,
1079	BTRFS_ROOT_DELETING,
1080
1081	/*
1082	 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan
1083	 *
1084	 * Set for the subvolume tree owning the reloc tree.
1085	 */
1086	BTRFS_ROOT_DEAD_RELOC_TREE,
1087	/* Mark dead root stored on device whose cleanup needs to be resumed */
1088	BTRFS_ROOT_DEAD_TREE,
1089	/* The root has a log tree. Used for subvolume roots and the tree root. */
1090	BTRFS_ROOT_HAS_LOG_TREE,
1091	/* Qgroup flushing is in progress */
1092	BTRFS_ROOT_QGROUP_FLUSHING,
1093};
1094
1095/*
1096 * Record swapped tree blocks of a subvolume tree for delayed subtree trace
1097 * code. For detail check comment in fs/btrfs/qgroup.c.
1098 */
1099struct btrfs_qgroup_swapped_blocks {
1100	spinlock_t lock;
1101	/* RM_EMPTY_ROOT() of above blocks[] */
1102	bool swapped;
1103	struct rb_root blocks[BTRFS_MAX_LEVEL];
1104};
1105
1106/*
1107 * in ram representation of the tree.  extent_root is used for all allocations
1108 * and for the extent tree extent_root root.
1109 */
1110struct btrfs_root {
1111	struct extent_buffer *node;
1112
1113	struct extent_buffer *commit_root;
1114	struct btrfs_root *log_root;
1115	struct btrfs_root *reloc_root;
1116
1117	unsigned long state;
1118	struct btrfs_root_item root_item;
1119	struct btrfs_key root_key;
1120	struct btrfs_fs_info *fs_info;
1121	struct extent_io_tree dirty_log_pages;
1122
1123	struct mutex objectid_mutex;
1124
1125	spinlock_t accounting_lock;
1126	struct btrfs_block_rsv *block_rsv;
1127
1128	struct mutex log_mutex;
1129	wait_queue_head_t log_writer_wait;
1130	wait_queue_head_t log_commit_wait[2];
1131	struct list_head log_ctxs[2];
1132	/* Used only for log trees of subvolumes, not for the log root tree */
1133	atomic_t log_writers;
1134	atomic_t log_commit[2];
1135	/* Used only for log trees of subvolumes, not for the log root tree */
1136	atomic_t log_batch;
1137	int log_transid;
1138	/* No matter the commit succeeds or not*/
1139	int log_transid_committed;
1140	/* Just be updated when the commit succeeds. */
1141	int last_log_commit;
1142	pid_t log_start_pid;
1143
1144	u64 last_trans;
1145
1146	u32 type;
1147
1148	u64 free_objectid;
1149
1150	struct btrfs_key defrag_progress;
1151	struct btrfs_key defrag_max;
1152
1153	/* The dirty list is only used by non-shareable roots */
1154	struct list_head dirty_list;
1155
1156	struct list_head root_list;
1157
1158	spinlock_t log_extents_lock[2];
1159	struct list_head logged_list[2];
1160
1161	int orphan_cleanup_state;
1162
1163	spinlock_t inode_lock;
1164	/* red-black tree that keeps track of in-memory inodes */
1165	struct rb_root inode_tree;
1166
1167	/*
1168	 * radix tree that keeps track of delayed nodes of every inode,
1169	 * protected by inode_lock
1170	 */
1171	struct radix_tree_root delayed_nodes_tree;
1172	/*
1173	 * right now this just gets used so that a root has its own devid
1174	 * for stat.  It may be used for more later
1175	 */
1176	dev_t anon_dev;
1177
1178	spinlock_t root_item_lock;
1179	refcount_t refs;
1180
1181	struct mutex delalloc_mutex;
1182	spinlock_t delalloc_lock;
1183	/*
1184	 * all of the inodes that have delalloc bytes.  It is possible for
1185	 * this list to be empty even when there is still dirty data=ordered
1186	 * extents waiting to finish IO.
1187	 */
1188	struct list_head delalloc_inodes;
1189	struct list_head delalloc_root;
1190	u64 nr_delalloc_inodes;
1191
1192	struct mutex ordered_extent_mutex;
1193	/*
1194	 * this is used by the balancing code to wait for all the pending
1195	 * ordered extents
1196	 */
1197	spinlock_t ordered_extent_lock;
1198
1199	/*
1200	 * all of the data=ordered extents pending writeback
1201	 * these can span multiple transactions and basically include
1202	 * every dirty data page that isn't from nodatacow
1203	 */
1204	struct list_head ordered_extents;
1205	struct list_head ordered_root;
1206	u64 nr_ordered_extents;
1207
1208	/*
1209	 * Not empty if this subvolume root has gone through tree block swap
1210	 * (relocation)
1211	 *
1212	 * Will be used by reloc_control::dirty_subvol_roots.
1213	 */
1214	struct list_head reloc_dirty_list;
1215
1216	/*
1217	 * Number of currently running SEND ioctls to prevent
1218	 * manipulation with the read-only status via SUBVOL_SETFLAGS
1219	 */
1220	int send_in_progress;
1221	/*
1222	 * Number of currently running deduplication operations that have a
1223	 * destination inode belonging to this root. Protected by the lock
1224	 * root_item_lock.
1225	 */
1226	int dedupe_in_progress;
1227	/* For exclusion of snapshot creation and nocow writes */
1228	struct btrfs_drew_lock snapshot_lock;
1229
1230	atomic_t snapshot_force_cow;
1231
1232	/* For qgroup metadata reserved space */
1233	spinlock_t qgroup_meta_rsv_lock;
1234	u64 qgroup_meta_rsv_pertrans;
1235	u64 qgroup_meta_rsv_prealloc;
1236	wait_queue_head_t qgroup_flush_wait;
1237
1238	/* Number of active swapfiles */
1239	atomic_t nr_swapfiles;
1240
1241	/* Record pairs of swapped blocks for qgroup */
1242	struct btrfs_qgroup_swapped_blocks swapped_blocks;
1243
1244	/* Used only by log trees, when logging csum items */
1245	struct extent_io_tree log_csum_range;
1246
1247#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1248	u64 alloc_bytenr;
1249#endif
1250
1251#ifdef CONFIG_BTRFS_DEBUG
1252	struct list_head leak_list;
1253#endif
1254};
1255
1256/*
1257 * Structure that conveys information about an extent that is going to replace
1258 * all the extents in a file range.
1259 */
1260struct btrfs_replace_extent_info {
1261	u64 disk_offset;
1262	u64 disk_len;
1263	u64 data_offset;
1264	u64 data_len;
1265	u64 file_offset;
1266	/* Pointer to a file extent item of type regular or prealloc. */
1267	char *extent_buf;
1268	/*
1269	 * Set to true when attempting to replace a file range with a new extent
1270	 * described by this structure, set to false when attempting to clone an
1271	 * existing extent into a file range.
1272	 */
1273	bool is_new_extent;
1274	/* Meaningful only if is_new_extent is true. */
1275	int qgroup_reserved;
1276	/*
1277	 * Meaningful only if is_new_extent is true.
1278	 * Used to track how many extent items we have already inserted in a
1279	 * subvolume tree that refer to the extent described by this structure,
1280	 * so that we know when to create a new delayed ref or update an existing
1281	 * one.
1282	 */
1283	int insertions;
1284};
1285
1286/* Arguments for btrfs_drop_extents() */
1287struct btrfs_drop_extents_args {
1288	/* Input parameters */
1289
1290	/*
1291	 * If NULL, btrfs_drop_extents() will allocate and free its own path.
1292	 * If 'replace_extent' is true, this must not be NULL. Also the path
1293	 * is always released except if 'replace_extent' is true and
1294	 * btrfs_drop_extents() sets 'extent_inserted' to true, in which case
1295	 * the path is kept locked.
1296	 */
1297	struct btrfs_path *path;
1298	/* Start offset of the range to drop extents from */
1299	u64 start;
1300	/* End (exclusive, last byte + 1) of the range to drop extents from */
1301	u64 end;
1302	/* If true drop all the extent maps in the range */
1303	bool drop_cache;
1304	/*
1305	 * If true it means we want to insert a new extent after dropping all
1306	 * the extents in the range. If this is true, the 'extent_item_size'
1307	 * parameter must be set as well and the 'extent_inserted' field will
1308	 * be set to true by btrfs_drop_extents() if it could insert the new
1309	 * extent.
1310	 * Note: when this is set to true the path must not be NULL.
1311	 */
1312	bool replace_extent;
1313	/*
1314	 * Used if 'replace_extent' is true. Size of the file extent item to
1315	 * insert after dropping all existing extents in the range
1316	 */
1317	u32 extent_item_size;
1318
1319	/* Output parameters */
1320
1321	/*
1322	 * Set to the minimum between the input parameter 'end' and the end
1323	 * (exclusive, last byte + 1) of the last dropped extent. This is always
1324	 * set even if btrfs_drop_extents() returns an error.
1325	 */
1326	u64 drop_end;
1327	/*
1328	 * The number of allocated bytes found in the range. This can be smaller
1329	 * than the range's length when there are holes in the range.
1330	 */
1331	u64 bytes_found;
1332	/*
1333	 * Only set if 'replace_extent' is true. Set to true if we were able
1334	 * to insert a replacement extent after dropping all extents in the
1335	 * range, otherwise set to false by btrfs_drop_extents().
1336	 * Also, if btrfs_drop_extents() has set this to true it means it
1337	 * returned with the path locked, otherwise if it has set this to
1338	 * false it has returned with the path released.
1339	 */
1340	bool extent_inserted;
1341};
1342
1343struct btrfs_file_private {
1344	void *filldir_buf;
1345};
1346
1347
1348static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1349{
1350
1351	return info->nodesize - sizeof(struct btrfs_header);
1352}
1353
1354#define BTRFS_LEAF_DATA_OFFSET		offsetof(struct btrfs_leaf, items)
1355
1356static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1357{
1358	return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1359}
1360
1361static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1362{
1363	return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1364}
1365
1366#define BTRFS_FILE_EXTENT_INLINE_DATA_START		\
1367		(offsetof(struct btrfs_file_extent_item, disk_bytenr))
1368static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1369{
1370	return BTRFS_MAX_ITEM_SIZE(info) -
1371	       BTRFS_FILE_EXTENT_INLINE_DATA_START;
1372}
1373
1374static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1375{
1376	return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1377}
1378
1379/*
1380 * Flags for mount options.
1381 *
1382 * Note: don't forget to add new options to btrfs_show_options()
1383 */
1384enum {
1385	BTRFS_MOUNT_NODATASUM			= (1UL << 0),
1386	BTRFS_MOUNT_NODATACOW			= (1UL << 1),
1387	BTRFS_MOUNT_NOBARRIER			= (1UL << 2),
1388	BTRFS_MOUNT_SSD				= (1UL << 3),
1389	BTRFS_MOUNT_DEGRADED			= (1UL << 4),
1390	BTRFS_MOUNT_COMPRESS			= (1UL << 5),
1391	BTRFS_MOUNT_NOTREELOG   		= (1UL << 6),
1392	BTRFS_MOUNT_FLUSHONCOMMIT		= (1UL << 7),
1393	BTRFS_MOUNT_SSD_SPREAD			= (1UL << 8),
1394	BTRFS_MOUNT_NOSSD			= (1UL << 9),
1395	BTRFS_MOUNT_DISCARD_SYNC		= (1UL << 10),
1396	BTRFS_MOUNT_FORCE_COMPRESS      	= (1UL << 11),
1397	BTRFS_MOUNT_SPACE_CACHE			= (1UL << 12),
1398	BTRFS_MOUNT_CLEAR_CACHE			= (1UL << 13),
1399	BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED	= (1UL << 14),
1400	BTRFS_MOUNT_ENOSPC_DEBUG		= (1UL << 15),
1401	BTRFS_MOUNT_AUTO_DEFRAG			= (1UL << 16),
1402	BTRFS_MOUNT_USEBACKUPROOT		= (1UL << 17),
1403	BTRFS_MOUNT_SKIP_BALANCE		= (1UL << 18),
1404	BTRFS_MOUNT_CHECK_INTEGRITY		= (1UL << 19),
1405	BTRFS_MOUNT_CHECK_INTEGRITY_DATA	= (1UL << 20),
1406	BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	= (1UL << 21),
1407	BTRFS_MOUNT_RESCAN_UUID_TREE		= (1UL << 22),
1408	BTRFS_MOUNT_FRAGMENT_DATA		= (1UL << 23),
1409	BTRFS_MOUNT_FRAGMENT_METADATA		= (1UL << 24),
1410	BTRFS_MOUNT_FREE_SPACE_TREE		= (1UL << 25),
1411	BTRFS_MOUNT_NOLOGREPLAY			= (1UL << 26),
1412	BTRFS_MOUNT_REF_VERIFY			= (1UL << 27),
1413	BTRFS_MOUNT_DISCARD_ASYNC		= (1UL << 28),
1414	BTRFS_MOUNT_IGNOREBADROOTS		= (1UL << 29),
1415	BTRFS_MOUNT_IGNOREDATACSUMS		= (1UL << 30),
1416};
1417
1418#define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)
1419#define BTRFS_DEFAULT_MAX_INLINE	(2048)
1420
1421#define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
1422#define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
1423#define btrfs_raw_test_opt(o, opt)	((o) & BTRFS_MOUNT_##opt)
1424#define btrfs_test_opt(fs_info, opt)	((fs_info)->mount_opt & \
1425					 BTRFS_MOUNT_##opt)
1426
1427#define btrfs_set_and_info(fs_info, opt, fmt, args...)			\
1428do {									\
1429	if (!btrfs_test_opt(fs_info, opt))				\
1430		btrfs_info(fs_info, fmt, ##args);			\
1431	btrfs_set_opt(fs_info->mount_opt, opt);				\
1432} while (0)
1433
1434#define btrfs_clear_and_info(fs_info, opt, fmt, args...)		\
1435do {									\
1436	if (btrfs_test_opt(fs_info, opt))				\
1437		btrfs_info(fs_info, fmt, ##args);			\
1438	btrfs_clear_opt(fs_info->mount_opt, opt);			\
1439} while (0)
1440
1441/*
1442 * Requests for changes that need to be done during transaction commit.
1443 *
1444 * Internal mount options that are used for special handling of the real
1445 * mount options (eg. cannot be set during remount and have to be set during
1446 * transaction commit)
1447 */
1448
1449#define BTRFS_PENDING_COMMIT			(0)
1450
1451#define btrfs_test_pending(info, opt)	\
1452	test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1453#define btrfs_set_pending(info, opt)	\
1454	set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1455#define btrfs_clear_pending(info, opt)	\
1456	clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1457
1458/*
1459 * Helpers for setting pending mount option changes.
1460 *
1461 * Expects corresponding macros
1462 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1463 */
1464#define btrfs_set_pending_and_info(info, opt, fmt, args...)            \
1465do {                                                                   \
1466       if (!btrfs_raw_test_opt((info)->mount_opt, opt)) {              \
1467               btrfs_info((info), fmt, ##args);                        \
1468               btrfs_set_pending((info), SET_##opt);                   \
1469               btrfs_clear_pending((info), CLEAR_##opt);               \
1470       }                                                               \
1471} while(0)
1472
1473#define btrfs_clear_pending_and_info(info, opt, fmt, args...)          \
1474do {                                                                   \
1475       if (btrfs_raw_test_opt((info)->mount_opt, opt)) {               \
1476               btrfs_info((info), fmt, ##args);                        \
1477               btrfs_set_pending((info), CLEAR_##opt);                 \
1478               btrfs_clear_pending((info), SET_##opt);                 \
1479       }                                                               \
1480} while(0)
1481
1482/*
1483 * Inode flags
1484 */
1485#define BTRFS_INODE_NODATASUM		(1 << 0)
1486#define BTRFS_INODE_NODATACOW		(1 << 1)
1487#define BTRFS_INODE_READONLY		(1 << 2)
1488#define BTRFS_INODE_NOCOMPRESS		(1 << 3)
1489#define BTRFS_INODE_PREALLOC		(1 << 4)
1490#define BTRFS_INODE_SYNC		(1 << 5)
1491#define BTRFS_INODE_IMMUTABLE		(1 << 6)
1492#define BTRFS_INODE_APPEND		(1 << 7)
1493#define BTRFS_INODE_NODUMP		(1 << 8)
1494#define BTRFS_INODE_NOATIME		(1 << 9)
1495#define BTRFS_INODE_DIRSYNC		(1 << 10)
1496#define BTRFS_INODE_COMPRESS		(1 << 11)
1497
1498#define BTRFS_INODE_ROOT_ITEM_INIT	(1 << 31)
1499
1500#define BTRFS_INODE_FLAG_MASK						\
1501	(BTRFS_INODE_NODATASUM |					\
1502	 BTRFS_INODE_NODATACOW |					\
1503	 BTRFS_INODE_READONLY |						\
1504	 BTRFS_INODE_NOCOMPRESS |					\
1505	 BTRFS_INODE_PREALLOC |						\
1506	 BTRFS_INODE_SYNC |						\
1507	 BTRFS_INODE_IMMUTABLE |					\
1508	 BTRFS_INODE_APPEND |						\
1509	 BTRFS_INODE_NODUMP |						\
1510	 BTRFS_INODE_NOATIME |						\
1511	 BTRFS_INODE_DIRSYNC |						\
1512	 BTRFS_INODE_COMPRESS |						\
1513	 BTRFS_INODE_ROOT_ITEM_INIT)
1514
1515struct btrfs_map_token {
1516	struct extent_buffer *eb;
1517	char *kaddr;
1518	unsigned long offset;
1519};
1520
1521#define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1522				((bytes) >> (fs_info)->sectorsize_bits)
1523
1524static inline void btrfs_init_map_token(struct btrfs_map_token *token,
1525					struct extent_buffer *eb)
1526{
1527	token->eb = eb;
1528	token->kaddr = page_address(eb->pages[0]);
1529	token->offset = 0;
1530}
1531
1532/* some macros to generate set/get functions for the struct fields.  This
1533 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1534 * one for u8:
1535 */
1536#define le8_to_cpu(v) (v)
1537#define cpu_to_le8(v) (v)
1538#define __le8 u8
1539
1540static inline u8 get_unaligned_le8(const void *p)
1541{
1542       return *(u8 *)p;
1543}
1544
1545static inline void put_unaligned_le8(u8 val, void *p)
1546{
1547       *(u8 *)p = val;
1548}
1549
1550#define read_eb_member(eb, ptr, type, member, result) (\
1551	read_extent_buffer(eb, (char *)(result),			\
1552			   ((unsigned long)(ptr)) +			\
1553			    offsetof(type, member),			\
1554			   sizeof(((type *)0)->member)))
1555
1556#define write_eb_member(eb, ptr, type, member, result) (\
1557	write_extent_buffer(eb, (char *)(result),			\
1558			   ((unsigned long)(ptr)) +			\
1559			    offsetof(type, member),			\
1560			   sizeof(((type *)0)->member)))
1561
1562#define DECLARE_BTRFS_SETGET_BITS(bits)					\
1563u##bits btrfs_get_token_##bits(struct btrfs_map_token *token,		\
1564			       const void *ptr, unsigned long off);	\
1565void btrfs_set_token_##bits(struct btrfs_map_token *token,		\
1566			    const void *ptr, unsigned long off,		\
1567			    u##bits val);				\
1568u##bits btrfs_get_##bits(const struct extent_buffer *eb,		\
1569			 const void *ptr, unsigned long off);		\
1570void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr,	\
1571		      unsigned long off, u##bits val);
1572
1573DECLARE_BTRFS_SETGET_BITS(8)
1574DECLARE_BTRFS_SETGET_BITS(16)
1575DECLARE_BTRFS_SETGET_BITS(32)
1576DECLARE_BTRFS_SETGET_BITS(64)
1577
1578#define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
1579static inline u##bits btrfs_##name(const struct extent_buffer *eb,	\
1580				   const type *s)			\
1581{									\
1582	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1583	return btrfs_get_##bits(eb, s, offsetof(type, member));		\
1584}									\
1585static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \
1586				    u##bits val)			\
1587{									\
1588	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1589	btrfs_set_##bits(eb, s, offsetof(type, member), val);		\
1590}									\
1591static inline u##bits btrfs_token_##name(struct btrfs_map_token *token,	\
1592					 const type *s)			\
1593{									\
1594	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1595	return btrfs_get_token_##bits(token, s, offsetof(type, member));\
1596}									\
1597static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\
1598					  type *s, u##bits val)		\
1599{									\
1600	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
1601	btrfs_set_token_##bits(token, s, offsetof(type, member), val);	\
1602}
1603
1604#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
1605static inline u##bits btrfs_##name(const struct extent_buffer *eb)	\
1606{									\
1607	const type *p = page_address(eb->pages[0]) +			\
1608			offset_in_page(eb->start);			\
1609	return get_unaligned_le##bits(&p->member);			\
1610}									\
1611static inline void btrfs_set_##name(const struct extent_buffer *eb,	\
1612				    u##bits val)			\
1613{									\
1614	type *p = page_address(eb->pages[0]) + offset_in_page(eb->start); \
1615	put_unaligned_le##bits(val, &p->member);			\
1616}
1617
1618#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
1619static inline u##bits btrfs_##name(const type *s)			\
1620{									\
1621	return get_unaligned_le##bits(&s->member);			\
1622}									\
1623static inline void btrfs_set_##name(type *s, u##bits val)		\
1624{									\
1625	put_unaligned_le##bits(val, &s->member);			\
1626}
1627
1628static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb,
1629					   struct btrfs_dev_item *s)
1630{
1631	BUILD_BUG_ON(sizeof(u64) !=
1632		     sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1633	return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
1634					    total_bytes));
1635}
1636static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb,
1637						struct btrfs_dev_item *s,
1638						u64 val)
1639{
1640	BUILD_BUG_ON(sizeof(u64) !=
1641		     sizeof(((struct btrfs_dev_item *)0))->total_bytes);
1642	WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize));
1643	btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
1644}
1645
1646
1647BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1648BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1649BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1650BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1651BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1652		   start_offset, 64);
1653BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1654BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1655BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1656BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1657BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1658BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1659
1660BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1661BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1662			 total_bytes, 64);
1663BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1664			 bytes_used, 64);
1665BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1666			 io_align, 32);
1667BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1668			 io_width, 32);
1669BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1670			 sector_size, 32);
1671BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1672BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1673			 dev_group, 32);
1674BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1675			 seek_speed, 8);
1676BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1677			 bandwidth, 8);
1678BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1679			 generation, 64);
1680
1681static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1682{
1683	return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1684}
1685
1686static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1687{
1688	return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1689}
1690
1691BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1692BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1693BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1694BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1695BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1696BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1697BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1698BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1699BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1700BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1701BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1702
1703static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1704{
1705	return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1706}
1707
1708BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1709BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1710BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1711			 stripe_len, 64);
1712BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1713			 io_align, 32);
1714BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1715			 io_width, 32);
1716BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1717			 sector_size, 32);
1718BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1719BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1720			 num_stripes, 16);
1721BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1722			 sub_stripes, 16);
1723BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1724BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1725
1726static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1727						   int nr)
1728{
1729	unsigned long offset = (unsigned long)c;
1730	offset += offsetof(struct btrfs_chunk, stripe);
1731	offset += nr * sizeof(struct btrfs_stripe);
1732	return (struct btrfs_stripe *)offset;
1733}
1734
1735static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1736{
1737	return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1738}
1739
1740static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb,
1741					 struct btrfs_chunk *c, int nr)
1742{
1743	return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1744}
1745
1746static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb,
1747					 struct btrfs_chunk *c, int nr)
1748{
1749	return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1750}
1751
1752/* struct btrfs_block_group_item */
1753BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item,
1754			 used, 64);
1755BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item,
1756			 used, 64);
1757BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid,
1758			struct btrfs_block_group_item, chunk_objectid, 64);
1759
1760BTRFS_SETGET_FUNCS(block_group_chunk_objectid,
1761		   struct btrfs_block_group_item, chunk_objectid, 64);
1762BTRFS_SETGET_FUNCS(block_group_flags,
1763		   struct btrfs_block_group_item, flags, 64);
1764BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags,
1765			struct btrfs_block_group_item, flags, 64);
1766
1767/* struct btrfs_free_space_info */
1768BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1769		   extent_count, 32);
1770BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1771
1772/* struct btrfs_inode_ref */
1773BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1774BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1775
1776/* struct btrfs_inode_extref */
1777BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1778		   parent_objectid, 64);
1779BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1780		   name_len, 16);
1781BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1782
1783/* struct btrfs_inode_item */
1784BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1785BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1786BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1787BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1788BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1789BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1790BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1791BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1792BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1793BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1794BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1795BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1796BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1797			 generation, 64);
1798BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1799			 sequence, 64);
1800BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1801			 transid, 64);
1802BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1803BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1804			 nbytes, 64);
1805BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1806			 block_group, 64);
1807BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1808BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1809BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1810BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1811BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1812BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1813BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1814BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1815BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1816BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1817
1818/* struct btrfs_dev_extent */
1819BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1820		   chunk_tree, 64);
1821BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1822		   chunk_objectid, 64);
1823BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1824		   chunk_offset, 64);
1825BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1826BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1827BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1828		   generation, 64);
1829BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1830
1831BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1832
1833static inline void btrfs_tree_block_key(const struct extent_buffer *eb,
1834					struct btrfs_tree_block_info *item,
1835					struct btrfs_disk_key *key)
1836{
1837	read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1838}
1839
1840static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb,
1841					    struct btrfs_tree_block_info *item,
1842					    struct btrfs_disk_key *key)
1843{
1844	write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1845}
1846
1847BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1848		   root, 64);
1849BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1850		   objectid, 64);
1851BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1852		   offset, 64);
1853BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1854		   count, 32);
1855
1856BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1857		   count, 32);
1858
1859BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1860		   type, 8);
1861BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1862		   offset, 64);
1863
1864static inline u32 btrfs_extent_inline_ref_size(int type)
1865{
1866	if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1867	    type == BTRFS_SHARED_BLOCK_REF_KEY)
1868		return sizeof(struct btrfs_extent_inline_ref);
1869	if (type == BTRFS_SHARED_DATA_REF_KEY)
1870		return sizeof(struct btrfs_shared_data_ref) +
1871		       sizeof(struct btrfs_extent_inline_ref);
1872	if (type == BTRFS_EXTENT_DATA_REF_KEY)
1873		return sizeof(struct btrfs_extent_data_ref) +
1874		       offsetof(struct btrfs_extent_inline_ref, offset);
1875	return 0;
1876}
1877
1878/* struct btrfs_node */
1879BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1880BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1881BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1882			 blockptr, 64);
1883BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1884			 generation, 64);
1885
1886static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr)
1887{
1888	unsigned long ptr;
1889	ptr = offsetof(struct btrfs_node, ptrs) +
1890		sizeof(struct btrfs_key_ptr) * nr;
1891	return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1892}
1893
1894static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb,
1895					   int nr, u64 val)
1896{
1897	unsigned long ptr;
1898	ptr = offsetof(struct btrfs_node, ptrs) +
1899		sizeof(struct btrfs_key_ptr) * nr;
1900	btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1901}
1902
1903static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr)
1904{
1905	unsigned long ptr;
1906	ptr = offsetof(struct btrfs_node, ptrs) +
1907		sizeof(struct btrfs_key_ptr) * nr;
1908	return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1909}
1910
1911static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb,
1912						 int nr, u64 val)
1913{
1914	unsigned long ptr;
1915	ptr = offsetof(struct btrfs_node, ptrs) +
1916		sizeof(struct btrfs_key_ptr) * nr;
1917	btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1918}
1919
1920static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1921{
1922	return offsetof(struct btrfs_node, ptrs) +
1923		sizeof(struct btrfs_key_ptr) * nr;
1924}
1925
1926void btrfs_node_key(const struct extent_buffer *eb,
1927		    struct btrfs_disk_key *disk_key, int nr);
1928
1929static inline void btrfs_set_node_key(const struct extent_buffer *eb,
1930				      struct btrfs_disk_key *disk_key, int nr)
1931{
1932	unsigned long ptr;
1933	ptr = btrfs_node_key_ptr_offset(nr);
1934	write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1935		       struct btrfs_key_ptr, key, disk_key);
1936}
1937
1938/* struct btrfs_item */
1939BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1940BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1941BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1942BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1943
1944static inline unsigned long btrfs_item_nr_offset(int nr)
1945{
1946	return offsetof(struct btrfs_leaf, items) +
1947		sizeof(struct btrfs_item) * nr;
1948}
1949
1950static inline struct btrfs_item *btrfs_item_nr(int nr)
1951{
1952	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1953}
1954
1955static inline u32 btrfs_item_end(const struct extent_buffer *eb,
1956				 struct btrfs_item *item)
1957{
1958	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1959}
1960
1961static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
1962{
1963	return btrfs_item_end(eb, btrfs_item_nr(nr));
1964}
1965
1966static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
1967{
1968	return btrfs_item_offset(eb, btrfs_item_nr(nr));
1969}
1970
1971static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
1972{
1973	return btrfs_item_size(eb, btrfs_item_nr(nr));
1974}
1975
1976static inline void btrfs_item_key(const struct extent_buffer *eb,
1977			   struct btrfs_disk_key *disk_key, int nr)
1978{
1979	struct btrfs_item *item = btrfs_item_nr(nr);
1980	read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1981}
1982
1983static inline void btrfs_set_item_key(struct extent_buffer *eb,
1984			       struct btrfs_disk_key *disk_key, int nr)
1985{
1986	struct btrfs_item *item = btrfs_item_nr(nr);
1987	write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1988}
1989
1990BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1991
1992/*
1993 * struct btrfs_root_ref
1994 */
1995BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1996BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1997BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1998
1999/* struct btrfs_dir_item */
2000BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
2001BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
2002BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
2003BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
2004BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
2005BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
2006			 data_len, 16);
2007BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
2008			 name_len, 16);
2009BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
2010			 transid, 64);
2011
2012static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
2013				      const struct btrfs_dir_item *item,
2014				      struct btrfs_disk_key *key)
2015{
2016	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
2017}
2018
2019static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
2020					  struct btrfs_dir_item *item,
2021					  const struct btrfs_disk_key *key)
2022{
2023	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
2024}
2025
2026BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
2027		   num_entries, 64);
2028BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
2029		   num_bitmaps, 64);
2030BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
2031		   generation, 64);
2032
2033static inline void btrfs_free_space_key(const struct extent_buffer *eb,
2034					const struct btrfs_free_space_header *h,
2035					struct btrfs_disk_key *key)
2036{
2037	read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2038}
2039
2040static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
2041					    struct btrfs_free_space_header *h,
2042					    const struct btrfs_disk_key *key)
2043{
2044	write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
2045}
2046
2047/* struct btrfs_disk_key */
2048BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
2049			 objectid, 64);
2050BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
2051BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
2052
2053#ifdef __LITTLE_ENDIAN
2054
2055/*
2056 * Optimized helpers for little-endian architectures where CPU and on-disk
2057 * structures have the same endianness and we can skip conversions.
2058 */
2059
2060static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu_key,
2061					 const struct btrfs_disk_key *disk_key)
2062{
2063	memcpy(cpu_key, disk_key, sizeof(struct btrfs_key));
2064}
2065
2066static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk_key,
2067					 const struct btrfs_key *cpu_key)
2068{
2069	memcpy(disk_key, cpu_key, sizeof(struct btrfs_key));
2070}
2071
2072static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2073					 struct btrfs_key *cpu_key, int nr)
2074{
2075	struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2076
2077	btrfs_node_key(eb, disk_key, nr);
2078}
2079
2080static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2081					 struct btrfs_key *cpu_key, int nr)
2082{
2083	struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2084
2085	btrfs_item_key(eb, disk_key, nr);
2086}
2087
2088static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2089					     const struct btrfs_dir_item *item,
2090					     struct btrfs_key *cpu_key)
2091{
2092	struct btrfs_disk_key *disk_key = (struct btrfs_disk_key *)cpu_key;
2093
2094	btrfs_dir_item_key(eb, item, disk_key);
2095}
2096
2097#else
2098
2099static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
2100					 const struct btrfs_disk_key *disk)
2101{
2102	cpu->offset = le64_to_cpu(disk->offset);
2103	cpu->type = disk->type;
2104	cpu->objectid = le64_to_cpu(disk->objectid);
2105}
2106
2107static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
2108					 const struct btrfs_key *cpu)
2109{
2110	disk->offset = cpu_to_le64(cpu->offset);
2111	disk->type = cpu->type;
2112	disk->objectid = cpu_to_le64(cpu->objectid);
2113}
2114
2115static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
2116					 struct btrfs_key *key, int nr)
2117{
2118	struct btrfs_disk_key disk_key;
2119	btrfs_node_key(eb, &disk_key, nr);
2120	btrfs_disk_key_to_cpu(key, &disk_key);
2121}
2122
2123static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
2124					 struct btrfs_key *key, int nr)
2125{
2126	struct btrfs_disk_key disk_key;
2127	btrfs_item_key(eb, &disk_key, nr);
2128	btrfs_disk_key_to_cpu(key, &disk_key);
2129}
2130
2131static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
2132					     const struct btrfs_dir_item *item,
2133					     struct btrfs_key *key)
2134{
2135	struct btrfs_disk_key disk_key;
2136	btrfs_dir_item_key(eb, item, &disk_key);
2137	btrfs_disk_key_to_cpu(key, &disk_key);
2138}
2139
2140#endif
2141
2142/* struct btrfs_header */
2143BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2144BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2145			  generation, 64);
2146BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2147BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2148BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2149BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2150BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2151			 generation, 64);
2152BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2153BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2154			 nritems, 32);
2155BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2156
2157static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
2158{
2159	return (btrfs_header_flags(eb) & flag) == flag;
2160}
2161
2162static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2163{
2164	u64 flags = btrfs_header_flags(eb);
2165	btrfs_set_header_flags(eb, flags | flag);
2166}
2167
2168static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2169{
2170	u64 flags = btrfs_header_flags(eb);
2171	btrfs_set_header_flags(eb, flags & ~flag);
2172}
2173
2174static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
2175{
2176	u64 flags = btrfs_header_flags(eb);
2177	return flags >> BTRFS_BACKREF_REV_SHIFT;
2178}
2179
2180static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2181						int rev)
2182{
2183	u64 flags = btrfs_header_flags(eb);
2184	flags &= ~BTRFS_BACKREF_REV_MASK;
2185	flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2186	btrfs_set_header_flags(eb, flags);
2187}
2188
2189static inline int btrfs_is_leaf(const struct extent_buffer *eb)
2190{
2191	return btrfs_header_level(eb) == 0;
2192}
2193
2194/* struct btrfs_root_item */
2195BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2196		   generation, 64);
2197BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2198BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2199BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2200
2201BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2202			 generation, 64);
2203BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2204BTRFS_SETGET_STACK_FUNCS(root_drop_level, struct btrfs_root_item, drop_level, 8);
2205BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2206BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2207BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2208BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2209BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2210BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2211BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2212			 last_snapshot, 64);
2213BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2214			 generation_v2, 64);
2215BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2216			 ctransid, 64);
2217BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2218			 otransid, 64);
2219BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2220			 stransid, 64);
2221BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2222			 rtransid, 64);
2223
2224static inline bool btrfs_root_readonly(const struct btrfs_root *root)
2225{
2226	/* Byte-swap the constant at compile time, root_item::flags is LE */
2227	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2228}
2229
2230static inline bool btrfs_root_dead(const struct btrfs_root *root)
2231{
2232	/* Byte-swap the constant at compile time, root_item::flags is LE */
2233	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2234}
2235
2236/* struct btrfs_root_backup */
2237BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2238		   tree_root, 64);
2239BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2240		   tree_root_gen, 64);
2241BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2242		   tree_root_level, 8);
2243
2244BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2245		   chunk_root, 64);
2246BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2247		   chunk_root_gen, 64);
2248BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2249		   chunk_root_level, 8);
2250
2251BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2252		   extent_root, 64);
2253BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2254		   extent_root_gen, 64);
2255BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2256		   extent_root_level, 8);
2257
2258BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2259		   fs_root, 64);
2260BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2261		   fs_root_gen, 64);
2262BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2263		   fs_root_level, 8);
2264
2265BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2266		   dev_root, 64);
2267BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2268		   dev_root_gen, 64);
2269BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2270		   dev_root_level, 8);
2271
2272BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2273		   csum_root, 64);
2274BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2275		   csum_root_gen, 64);
2276BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2277		   csum_root_level, 8);
2278BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2279		   total_bytes, 64);
2280BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2281		   bytes_used, 64);
2282BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2283		   num_devices, 64);
2284
2285/* struct btrfs_balance_item */
2286BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2287
2288static inline void btrfs_balance_data(const struct extent_buffer *eb,
2289				      const struct btrfs_balance_item *bi,
2290				      struct btrfs_disk_balance_args *ba)
2291{
2292	read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2293}
2294
2295static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2296				  struct btrfs_balance_item *bi,
2297				  const struct btrfs_disk_balance_args *ba)
2298{
2299	write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2300}
2301
2302static inline void btrfs_balance_meta(const struct extent_buffer *eb,
2303				      const struct btrfs_balance_item *bi,
2304				      struct btrfs_disk_balance_args *ba)
2305{
2306	read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2307}
2308
2309static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2310				  struct btrfs_balance_item *bi,
2311				  const struct btrfs_disk_balance_args *ba)
2312{
2313	write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2314}
2315
2316static inline void btrfs_balance_sys(const struct extent_buffer *eb,
2317				     const struct btrfs_balance_item *bi,
2318				     struct btrfs_disk_balance_args *ba)
2319{
2320	read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2321}
2322
2323static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2324				 struct btrfs_balance_item *bi,
2325				 const struct btrfs_disk_balance_args *ba)
2326{
2327	write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2328}
2329
2330static inline void
2331btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2332			       const struct btrfs_disk_balance_args *disk)
2333{
2334	memset(cpu, 0, sizeof(*cpu));
2335
2336	cpu->profiles = le64_to_cpu(disk->profiles);
2337	cpu->usage = le64_to_cpu(disk->usage);
2338	cpu->devid = le64_to_cpu(disk->devid);
2339	cpu->pstart = le64_to_cpu(disk->pstart);
2340	cpu->pend = le64_to_cpu(disk->pend);
2341	cpu->vstart = le64_to_cpu(disk->vstart);
2342	cpu->vend = le64_to_cpu(disk->vend);
2343	cpu->target = le64_to_cpu(disk->target);
2344	cpu->flags = le64_to_cpu(disk->flags);
2345	cpu->limit = le64_to_cpu(disk->limit);
2346	cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2347	cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2348}
2349
2350static inline void
2351btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2352			       const struct btrfs_balance_args *cpu)
2353{
2354	memset(disk, 0, sizeof(*disk));
2355
2356	disk->profiles = cpu_to_le64(cpu->profiles);
2357	disk->usage = cpu_to_le64(cpu->usage);
2358	disk->devid = cpu_to_le64(cpu->devid);
2359	disk->pstart = cpu_to_le64(cpu->pstart);
2360	disk->pend = cpu_to_le64(cpu->pend);
2361	disk->vstart = cpu_to_le64(cpu->vstart);
2362	disk->vend = cpu_to_le64(cpu->vend);
2363	disk->target = cpu_to_le64(cpu->target);
2364	disk->flags = cpu_to_le64(cpu->flags);
2365	disk->limit = cpu_to_le64(cpu->limit);
2366	disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2367	disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2368}
2369
2370/* struct btrfs_super_block */
2371BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2372BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2373BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2374			 generation, 64);
2375BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2376BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2377			 struct btrfs_super_block, sys_chunk_array_size, 32);
2378BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2379			 struct btrfs_super_block, chunk_root_generation, 64);
2380BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2381			 root_level, 8);
2382BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2383			 chunk_root, 64);
2384BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2385			 chunk_root_level, 8);
2386BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2387			 log_root, 64);
2388BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2389			 log_root_transid, 64);
2390BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2391			 log_root_level, 8);
2392BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2393			 total_bytes, 64);
2394BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2395			 bytes_used, 64);
2396BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2397			 sectorsize, 32);
2398BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2399			 nodesize, 32);
2400BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2401			 stripesize, 32);
2402BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2403			 root_dir_objectid, 64);
2404BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2405			 num_devices, 64);
2406BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2407			 compat_flags, 64);
2408BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2409			 compat_ro_flags, 64);
2410BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2411			 incompat_flags, 64);
2412BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2413			 csum_type, 16);
2414BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2415			 cache_generation, 64);
2416BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2417BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2418			 uuid_tree_generation, 64);
2419
2420int btrfs_super_csum_size(const struct btrfs_super_block *s);
2421const char *btrfs_super_csum_name(u16 csum_type);
2422const char *btrfs_super_csum_driver(u16 csum_type);
2423size_t __attribute_const__ btrfs_get_num_csums(void);
2424
2425
2426/*
2427 * The leaf data grows from end-to-front in the node.
2428 * this returns the address of the start of the last item,
2429 * which is the stop of the leaf data stack
2430 */
2431static inline unsigned int leaf_data_end(const struct extent_buffer *leaf)
2432{
2433	u32 nr = btrfs_header_nritems(leaf);
2434
2435	if (nr == 0)
2436		return BTRFS_LEAF_DATA_SIZE(leaf->fs_info);
2437	return btrfs_item_offset_nr(leaf, nr - 1);
2438}
2439
2440/* struct btrfs_file_extent_item */
2441BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item,
2442			 type, 8);
2443BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2444			 struct btrfs_file_extent_item, disk_bytenr, 64);
2445BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2446			 struct btrfs_file_extent_item, offset, 64);
2447BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2448			 struct btrfs_file_extent_item, generation, 64);
2449BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2450			 struct btrfs_file_extent_item, num_bytes, 64);
2451BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes,
2452			 struct btrfs_file_extent_item, ram_bytes, 64);
2453BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2454			 struct btrfs_file_extent_item, disk_num_bytes, 64);
2455BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2456			 struct btrfs_file_extent_item, compression, 8);
2457
2458static inline unsigned long
2459btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
2460{
2461	return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2462}
2463
2464static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2465{
2466	return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2467}
2468
2469BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2470BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2471		   disk_bytenr, 64);
2472BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2473		   generation, 64);
2474BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2475		   disk_num_bytes, 64);
2476BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2477		  offset, 64);
2478BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2479		   num_bytes, 64);
2480BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2481		   ram_bytes, 64);
2482BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2483		   compression, 8);
2484BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2485		   encryption, 8);
2486BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2487		   other_encoding, 16);
2488
2489/*
2490 * this returns the number of bytes used by the item on disk, minus the
2491 * size of any extent headers.  If a file is compressed on disk, this is
2492 * the compressed size
2493 */
2494static inline u32 btrfs_file_extent_inline_item_len(
2495						const struct extent_buffer *eb,
2496						struct btrfs_item *e)
2497{
2498	return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2499}
2500
2501/* btrfs_qgroup_status_item */
2502BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2503		   generation, 64);
2504BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2505		   version, 64);
2506BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2507		   flags, 64);
2508BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2509		   rescan, 64);
2510
2511/* btrfs_qgroup_info_item */
2512BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2513		   generation, 64);
2514BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2515BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2516		   rfer_cmpr, 64);
2517BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2518BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2519		   excl_cmpr, 64);
2520
2521BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2522			 struct btrfs_qgroup_info_item, generation, 64);
2523BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2524			 rfer, 64);
2525BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2526			 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2527BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2528			 excl, 64);
2529BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2530			 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2531
2532/* btrfs_qgroup_limit_item */
2533BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2534		   flags, 64);
2535BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2536		   max_rfer, 64);
2537BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2538		   max_excl, 64);
2539BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2540		   rsv_rfer, 64);
2541BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2542		   rsv_excl, 64);
2543
2544/* btrfs_dev_replace_item */
2545BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2546		   struct btrfs_dev_replace_item, src_devid, 64);
2547BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2548		   struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2549		   64);
2550BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2551		   replace_state, 64);
2552BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2553		   time_started, 64);
2554BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2555		   time_stopped, 64);
2556BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2557		   num_write_errors, 64);
2558BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2559		   struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2560		   64);
2561BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2562		   cursor_left, 64);
2563BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2564		   cursor_right, 64);
2565
2566BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2567			 struct btrfs_dev_replace_item, src_devid, 64);
2568BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2569			 struct btrfs_dev_replace_item,
2570			 cont_reading_from_srcdev_mode, 64);
2571BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2572			 struct btrfs_dev_replace_item, replace_state, 64);
2573BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2574			 struct btrfs_dev_replace_item, time_started, 64);
2575BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2576			 struct btrfs_dev_replace_item, time_stopped, 64);
2577BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2578			 struct btrfs_dev_replace_item, num_write_errors, 64);
2579BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2580			 struct btrfs_dev_replace_item,
2581			 num_uncorrectable_read_errors, 64);
2582BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2583			 struct btrfs_dev_replace_item, cursor_left, 64);
2584BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2585			 struct btrfs_dev_replace_item, cursor_right, 64);
2586
2587/* helper function to cast into the data area of the leaf. */
2588#define btrfs_item_ptr(leaf, slot, type) \
2589	((type *)(BTRFS_LEAF_DATA_OFFSET + \
2590	btrfs_item_offset_nr(leaf, slot)))
2591
2592#define btrfs_item_ptr_offset(leaf, slot) \
2593	((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \
2594	btrfs_item_offset_nr(leaf, slot)))
2595
2596static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length)
2597{
2598	return crc32c(crc, address, length);
2599}
2600
2601static inline void btrfs_crc32c_final(u32 crc, u8 *result)
2602{
2603	put_unaligned_le32(~crc, result);
2604}
2605
2606static inline u64 btrfs_name_hash(const char *name, int len)
2607{
2608       return crc32c((u32)~1, name, len);
2609}
2610
2611/*
2612 * Figure the key offset of an extended inode ref
2613 */
2614static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
2615                                   int len)
2616{
2617       return (u64) crc32c(parent_objectid, name, len);
2618}
2619
2620static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2621{
2622	return mapping_gfp_constraint(mapping, ~__GFP_FS);
2623}
2624
2625/* extent-tree.c */
2626
2627enum btrfs_inline_ref_type {
2628	BTRFS_REF_TYPE_INVALID,
2629	BTRFS_REF_TYPE_BLOCK,
2630	BTRFS_REF_TYPE_DATA,
2631	BTRFS_REF_TYPE_ANY,
2632};
2633
2634int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
2635				     struct btrfs_extent_inline_ref *iref,
2636				     enum btrfs_inline_ref_type is_data);
2637u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset);
2638
2639/*
2640 * Take the number of bytes to be checksummmed and figure out how many leaves
2641 * it would require to store the csums for that many bytes.
2642 */
2643static inline u64 btrfs_csum_bytes_to_leaves(
2644			const struct btrfs_fs_info *fs_info, u64 csum_bytes)
2645{
2646	const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
2647
2648	return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
2649}
2650
2651/*
2652 * Use this if we would be adding new items, as we could split nodes as we cow
2653 * down the tree.
2654 */
2655static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info,
2656						  unsigned num_items)
2657{
2658	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2659}
2660
2661/*
2662 * Doing a truncate or a modification won't result in new nodes or leaves, just
2663 * what we need for COW.
2664 */
2665static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info,
2666						 unsigned num_items)
2667{
2668	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2669}
2670
2671int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
2672			      u64 start, u64 num_bytes);
2673void btrfs_free_excluded_extents(struct btrfs_block_group *cache);
2674int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2675			   unsigned long count);
2676void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info,
2677				  struct btrfs_delayed_ref_root *delayed_refs,
2678				  struct btrfs_delayed_ref_head *head);
2679int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2680int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2681			     struct btrfs_fs_info *fs_info, u64 bytenr,
2682			     u64 offset, int metadata, u64 *refs, u64 *flags);
2683int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num,
2684		     int reserved);
2685int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
2686				    u64 bytenr, u64 num_bytes);
2687int btrfs_exclude_logged_extents(struct extent_buffer *eb);
2688int btrfs_cross_ref_exist(struct btrfs_root *root,
2689			  u64 objectid, u64 offset, u64 bytenr, bool strict);
2690struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2691					     struct btrfs_root *root,
2692					     u64 parent, u64 root_objectid,
2693					     const struct btrfs_disk_key *key,
2694					     int level, u64 hint,
2695					     u64 empty_size,
2696					     enum btrfs_lock_nesting nest);
2697void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2698			   struct btrfs_root *root,
2699			   struct extent_buffer *buf,
2700			   u64 parent, int last_ref);
2701int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2702				     struct btrfs_root *root, u64 owner,
2703				     u64 offset, u64 ram_bytes,
2704				     struct btrfs_key *ins);
2705int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2706				   u64 root_objectid, u64 owner, u64 offset,
2707				   struct btrfs_key *ins);
2708int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2709			 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2710			 struct btrfs_key *ins, int is_data, int delalloc);
2711int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2712		  struct extent_buffer *buf, int full_backref);
2713int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2714		  struct extent_buffer *buf, int full_backref);
2715int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2716				struct extent_buffer *eb, u64 flags,
2717				int level, int is_data);
2718int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref);
2719
2720int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2721			       u64 start, u64 len, int delalloc);
2722int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start,
2723			      u64 len);
2724int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
2725int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2726			 struct btrfs_ref *generic_ref);
2727
2728void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2729
2730/*
2731 * Different levels for to flush space when doing space reservations.
2732 *
2733 * The higher the level, the more methods we try to reclaim space.
2734 */
2735enum btrfs_reserve_flush_enum {
2736	/* If we are in the transaction, we can't flush anything.*/
2737	BTRFS_RESERVE_NO_FLUSH,
2738
2739	/*
2740	 * Flush space by:
2741	 * - Running delayed inode items
2742	 * - Allocating a new chunk
2743	 */
2744	BTRFS_RESERVE_FLUSH_LIMIT,
2745
2746	/*
2747	 * Flush space by:
2748	 * - Running delayed inode items
2749	 * - Running delayed refs
2750	 * - Running delalloc and waiting for ordered extents
2751	 * - Allocating a new chunk
2752	 */
2753	BTRFS_RESERVE_FLUSH_EVICT,
2754
2755	/*
2756	 * Flush space by above mentioned methods and by:
2757	 * - Running delayed iputs
2758	 * - Committing transaction
2759	 *
2760	 * Can be interrupted by a fatal signal.
2761	 */
2762	BTRFS_RESERVE_FLUSH_DATA,
2763	BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
2764	BTRFS_RESERVE_FLUSH_ALL,
2765
2766	/*
2767	 * Pretty much the same as FLUSH_ALL, but can also steal space from
2768	 * global rsv.
2769	 *
2770	 * Can be interrupted by a fatal signal.
2771	 */
2772	BTRFS_RESERVE_FLUSH_ALL_STEAL,
2773};
2774
2775enum btrfs_flush_state {
2776	FLUSH_DELAYED_ITEMS_NR	=	1,
2777	FLUSH_DELAYED_ITEMS	=	2,
2778	FLUSH_DELAYED_REFS_NR	=	3,
2779	FLUSH_DELAYED_REFS	=	4,
2780	FLUSH_DELALLOC		=	5,
2781	FLUSH_DELALLOC_WAIT	=	6,
2782	ALLOC_CHUNK		=	7,
2783	ALLOC_CHUNK_FORCE	=	8,
2784	RUN_DELAYED_IPUTS	=	9,
2785	COMMIT_TRANS		=	10,
2786};
2787
2788int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2789				     struct btrfs_block_rsv *rsv,
2790				     int nitems, bool use_global_rsv);
2791void btrfs_subvolume_release_metadata(struct btrfs_root *root,
2792				      struct btrfs_block_rsv *rsv);
2793void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes);
2794
2795int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes);
2796u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2797int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2798				   u64 start, u64 end);
2799int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2800			 u64 num_bytes, u64 *actual_bytes);
2801int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2802
2803int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2804int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2805					 struct btrfs_fs_info *fs_info);
2806int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
2807void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
2808void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2809
2810/* ctree.c */
2811int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
2812		     int *slot);
2813int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
2814int btrfs_previous_item(struct btrfs_root *root,
2815			struct btrfs_path *path, u64 min_objectid,
2816			int type);
2817int btrfs_previous_extent_item(struct btrfs_root *root,
2818			struct btrfs_path *path, u64 min_objectid);
2819void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2820			     struct btrfs_path *path,
2821			     const struct btrfs_key *new_key);
2822struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2823int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2824			struct btrfs_key *key, int lowest_level,
2825			u64 min_trans);
2826int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2827			 struct btrfs_path *path,
2828			 u64 min_trans);
2829struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent,
2830					   int slot);
2831
2832int btrfs_cow_block(struct btrfs_trans_handle *trans,
2833		    struct btrfs_root *root, struct extent_buffer *buf,
2834		    struct extent_buffer *parent, int parent_slot,
2835		    struct extent_buffer **cow_ret,
2836		    enum btrfs_lock_nesting nest);
2837int btrfs_copy_root(struct btrfs_trans_handle *trans,
2838		      struct btrfs_root *root,
2839		      struct extent_buffer *buf,
2840		      struct extent_buffer **cow_ret, u64 new_root_objectid);
2841int btrfs_block_can_be_shared(struct btrfs_root *root,
2842			      struct extent_buffer *buf);
2843void btrfs_extend_item(struct btrfs_path *path, u32 data_size);
2844void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end);
2845int btrfs_split_item(struct btrfs_trans_handle *trans,
2846		     struct btrfs_root *root,
2847		     struct btrfs_path *path,
2848		     const struct btrfs_key *new_key,
2849		     unsigned long split_offset);
2850int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2851			 struct btrfs_root *root,
2852			 struct btrfs_path *path,
2853			 const struct btrfs_key *new_key);
2854int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2855		u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2856int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2857		      const struct btrfs_key *key, struct btrfs_path *p,
2858		      int ins_len, int cow);
2859int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key,
2860			  struct btrfs_path *p, u64 time_seq);
2861int btrfs_search_slot_for_read(struct btrfs_root *root,
2862			       const struct btrfs_key *key,
2863			       struct btrfs_path *p, int find_higher,
2864			       int return_any);
2865int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2866		       struct btrfs_root *root, struct extent_buffer *parent,
2867		       int start_slot, u64 *last_ret,
2868		       struct btrfs_key *progress);
2869void btrfs_release_path(struct btrfs_path *p);
2870struct btrfs_path *btrfs_alloc_path(void);
2871void btrfs_free_path(struct btrfs_path *p);
2872
2873int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2874		   struct btrfs_path *path, int slot, int nr);
2875static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2876				 struct btrfs_root *root,
2877				 struct btrfs_path *path)
2878{
2879	return btrfs_del_items(trans, root, path, path->slots[0], 1);
2880}
2881
2882void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2883			    const struct btrfs_key *cpu_key, u32 *data_size,
2884			    int nr);
2885int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2886		      const struct btrfs_key *key, void *data, u32 data_size);
2887int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2888			     struct btrfs_root *root,
2889			     struct btrfs_path *path,
2890			     const struct btrfs_key *cpu_key, u32 *data_size,
2891			     int nr);
2892
2893static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2894					  struct btrfs_root *root,
2895					  struct btrfs_path *path,
2896					  const struct btrfs_key *key,
2897					  u32 data_size)
2898{
2899	return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2900}
2901
2902int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2903int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2904int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2905			u64 time_seq);
2906static inline int btrfs_next_old_item(struct btrfs_root *root,
2907				      struct btrfs_path *p, u64 time_seq)
2908{
2909	++p->slots[0];
2910	if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2911		return btrfs_next_old_leaf(root, p, time_seq);
2912	return 0;
2913}
2914static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2915{
2916	return btrfs_next_old_item(root, p, 0);
2917}
2918int btrfs_leaf_free_space(struct extent_buffer *leaf);
2919int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref,
2920				     int for_reloc);
2921int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2922			struct btrfs_root *root,
2923			struct extent_buffer *node,
2924			struct extent_buffer *parent);
2925static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2926{
2927	/*
2928	 * Do it this way so we only ever do one test_bit in the normal case.
2929	 */
2930	if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2931		if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2932			return 2;
2933		return 1;
2934	}
2935	return 0;
2936}
2937
2938/*
2939 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2940 * anything except sleeping. This function is used to check the status of
2941 * the fs.
2942 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
2943 * since setting and checking for SB_RDONLY in the superblock's flags is not
2944 * atomic.
2945 */
2946static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2947{
2948	return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
2949		btrfs_fs_closing(fs_info);
2950}
2951
2952static inline void btrfs_set_sb_rdonly(struct super_block *sb)
2953{
2954	sb->s_flags |= SB_RDONLY;
2955	set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
2956}
2957
2958static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
2959{
2960	sb->s_flags &= ~SB_RDONLY;
2961	clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
2962}
2963
2964/* root-item.c */
2965int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2966		       u64 ref_id, u64 dirid, u64 sequence, const char *name,
2967		       int name_len);
2968int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id,
2969		       u64 ref_id, u64 dirid, u64 *sequence, const char *name,
2970		       int name_len);
2971int btrfs_del_root(struct btrfs_trans_handle *trans,
2972		   const struct btrfs_key *key);
2973int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2974		      const struct btrfs_key *key,
2975		      struct btrfs_root_item *item);
2976int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2977				   struct btrfs_root *root,
2978				   struct btrfs_key *key,
2979				   struct btrfs_root_item *item);
2980int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key,
2981		    struct btrfs_path *path, struct btrfs_root_item *root_item,
2982		    struct btrfs_key *root_key);
2983int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
2984void btrfs_set_root_node(struct btrfs_root_item *item,
2985			 struct extent_buffer *node);
2986void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2987void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2988			     struct btrfs_root *root);
2989
2990/* uuid-tree.c */
2991int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
2992			u64 subid);
2993int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
2994			u64 subid);
2995int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
2996
2997/* dir-item.c */
2998int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
2999			  const char *name, int name_len);
3000int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name,
3001			  int name_len, struct btrfs_inode *dir,
3002			  struct btrfs_key *location, u8 type, u64 index);
3003struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
3004					     struct btrfs_root *root,
3005					     struct btrfs_path *path, u64 dir,
3006					     const char *name, int name_len,
3007					     int mod);
3008struct btrfs_dir_item *
3009btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
3010			    struct btrfs_root *root,
3011			    struct btrfs_path *path, u64 dir,
3012			    u64 objectid, const char *name, int name_len,
3013			    int mod);
3014struct btrfs_dir_item *
3015btrfs_search_dir_index_item(struct btrfs_root *root,
3016			    struct btrfs_path *path, u64 dirid,
3017			    const char *name, int name_len);
3018int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
3019			      struct btrfs_root *root,
3020			      struct btrfs_path *path,
3021			      struct btrfs_dir_item *di);
3022int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3023			    struct btrfs_root *root,
3024			    struct btrfs_path *path, u64 objectid,
3025			    const char *name, u16 name_len,
3026			    const void *data, u16 data_len);
3027struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3028					  struct btrfs_root *root,
3029					  struct btrfs_path *path, u64 dir,
3030					  const char *name, u16 name_len,
3031					  int mod);
3032struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3033						 struct btrfs_path *path,
3034						 const char *name,
3035						 int name_len);
3036
3037/* orphan.c */
3038int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3039			     struct btrfs_root *root, u64 offset);
3040int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3041			  struct btrfs_root *root, u64 offset);
3042int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3043
3044/* inode-item.c */
3045int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3046			   struct btrfs_root *root,
3047			   const char *name, int name_len,
3048			   u64 inode_objectid, u64 ref_objectid, u64 index);
3049int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3050			   struct btrfs_root *root,
3051			   const char *name, int name_len,
3052			   u64 inode_objectid, u64 ref_objectid, u64 *index);
3053int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3054			     struct btrfs_root *root,
3055			     struct btrfs_path *path, u64 objectid);
3056int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3057		       *root, struct btrfs_path *path,
3058		       struct btrfs_key *location, int mod);
3059
3060struct btrfs_inode_extref *
3061btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3062			  struct btrfs_root *root,
3063			  struct btrfs_path *path,
3064			  const char *name, int name_len,
3065			  u64 inode_objectid, u64 ref_objectid, int ins_len,
3066			  int cow);
3067
3068struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
3069						   int slot, const char *name,
3070						   int name_len);
3071struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
3072		struct extent_buffer *leaf, int slot, u64 ref_objectid,
3073		const char *name, int name_len);
3074/* file-item.c */
3075struct btrfs_dio_private;
3076int btrfs_del_csums(struct btrfs_trans_handle *trans,
3077		    struct btrfs_root *root, u64 bytenr, u64 len);
3078blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u8 *dst);
3079int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3080			     struct btrfs_root *root,
3081			     u64 objectid, u64 pos,
3082			     u64 disk_offset, u64 disk_num_bytes,
3083			     u64 num_bytes, u64 offset, u64 ram_bytes,
3084			     u8 compression, u8 encryption, u16 other_encoding);
3085int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3086			     struct btrfs_root *root,
3087			     struct btrfs_path *path, u64 objectid,
3088			     u64 bytenr, int mod);
3089int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3090			   struct btrfs_root *root,
3091			   struct btrfs_ordered_sum *sums);
3092blk_status_t btrfs_csum_one_bio(struct btrfs_inode *inode, struct bio *bio,
3093				u64 file_start, int contig);
3094int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3095			     struct list_head *list, int search_commit);
3096void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
3097				     const struct btrfs_path *path,
3098				     struct btrfs_file_extent_item *fi,
3099				     const bool new_inline,
3100				     struct extent_map *em);
3101int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
3102					u64 len);
3103int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start,
3104				      u64 len);
3105void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
3106u64 btrfs_file_extent_end(const struct btrfs_path *path);
3107
3108/* inode.c */
3109blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
3110				   int mirror_num, unsigned long bio_flags);
3111unsigned int btrfs_verify_data_csum(struct btrfs_io_bio *io_bio, u32 bio_offset,
3112				    struct page *page, u64 start, u64 end);
3113struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode,
3114					   u64 start, u64 len);
3115noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3116			      u64 *orig_start, u64 *orig_block_len,
3117			      u64 *ram_bytes, bool strict);
3118
3119void __btrfs_del_delalloc_inode(struct btrfs_root *root,
3120				struct btrfs_inode *inode);
3121struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3122int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
3123int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3124		       struct btrfs_root *root,
3125		       struct btrfs_inode *dir, struct btrfs_inode *inode,
3126		       const char *name, int name_len);
3127int btrfs_add_link(struct btrfs_trans_handle *trans,
3128		   struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
3129		   const char *name, int name_len, int add_backref, u64 index);
3130int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
3131int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
3132			 int front);
3133int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3134			       struct btrfs_root *root,
3135			       struct btrfs_inode *inode, u64 new_size,
3136			       u32 min_type, u64 *extents_found);
3137
3138int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context);
3139int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
3140			       bool in_reclaim_context);
3141int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
3142			      unsigned int extra_bits,
3143			      struct extent_state **cached_state);
3144int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3145			     struct btrfs_root *new_root,
3146			     struct btrfs_root *parent_root);
3147 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
3148			       unsigned *bits);
3149void btrfs_clear_delalloc_extent(struct inode *inode,
3150				 struct extent_state *state, unsigned *bits);
3151void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
3152				 struct extent_state *other);
3153void btrfs_split_delalloc_extent(struct inode *inode,
3154				 struct extent_state *orig, u64 split);
3155int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
3156			     unsigned long bio_flags);
3157void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
3158vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
3159int btrfs_readpage(struct file *file, struct page *page);
3160void btrfs_evict_inode(struct inode *inode);
3161int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3162struct inode *btrfs_alloc_inode(struct super_block *sb);
3163void btrfs_destroy_inode(struct inode *inode);
3164void btrfs_free_inode(struct inode *inode);
3165int btrfs_drop_inode(struct inode *inode);
3166int __init btrfs_init_cachep(void);
3167void __cold btrfs_destroy_cachep(void);
3168struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
3169			      struct btrfs_root *root, struct btrfs_path *path);
3170struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
3171struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
3172				    struct page *page, size_t pg_offset,
3173				    u64 start, u64 end);
3174int btrfs_update_inode(struct btrfs_trans_handle *trans,
3175		       struct btrfs_root *root, struct btrfs_inode *inode);
3176int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3177				struct btrfs_root *root, struct btrfs_inode *inode);
3178int btrfs_orphan_add(struct btrfs_trans_handle *trans,
3179		struct btrfs_inode *inode);
3180int btrfs_orphan_cleanup(struct btrfs_root *root);
3181int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size);
3182void btrfs_add_delayed_iput(struct inode *inode);
3183void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3184int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info);
3185int btrfs_prealloc_file_range(struct inode *inode, int mode,
3186			      u64 start, u64 num_bytes, u64 min_size,
3187			      loff_t actual_len, u64 *alloc_hint);
3188int btrfs_prealloc_file_range_trans(struct inode *inode,
3189				    struct btrfs_trans_handle *trans, int mode,
3190				    u64 start, u64 num_bytes, u64 min_size,
3191				    loff_t actual_len, u64 *alloc_hint);
3192int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page,
3193		u64 start, u64 end, int *page_started, unsigned long *nr_written,
3194		struct writeback_control *wbc);
3195int btrfs_writepage_cow_fixup(struct page *page);
3196void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode,
3197					  struct page *page, u64 start,
3198					  u64 end, bool uptodate);
3199extern const struct dentry_operations btrfs_dentry_operations;
3200extern const struct iomap_ops btrfs_dio_iomap_ops;
3201extern const struct iomap_dio_ops btrfs_dio_ops;
3202
3203/* Inode locking type flags, by default the exclusive lock is taken */
3204#define BTRFS_ILOCK_SHARED	(1U << 0)
3205#define BTRFS_ILOCK_TRY 	(1U << 1)
3206#define BTRFS_ILOCK_MMAP	(1U << 2)
3207
3208int btrfs_inode_lock(struct inode *inode, unsigned int ilock_flags);
3209void btrfs_inode_unlock(struct inode *inode, unsigned int ilock_flags);
3210void btrfs_update_inode_bytes(struct btrfs_inode *inode,
3211			      const u64 add_bytes,
3212			      const u64 del_bytes);
3213
3214/* ioctl.c */
3215long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3216long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3217int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3218int btrfs_fileattr_set(struct user_namespace *mnt_userns,
3219		       struct dentry *dentry, struct fileattr *fa);
3220int btrfs_ioctl_get_supported_features(void __user *arg);
3221void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
3222int __pure btrfs_is_empty_uuid(u8 *uuid);
3223int btrfs_defrag_file(struct inode *inode, struct file *file,
3224		      struct btrfs_ioctl_defrag_range_args *range,
3225		      u64 newer_than, unsigned long max_pages);
3226void btrfs_get_block_group_info(struct list_head *groups_list,
3227				struct btrfs_ioctl_space_info *space);
3228void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3229			       struct btrfs_ioctl_balance_args *bargs);
3230bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
3231			enum btrfs_exclusive_operation type);
3232bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
3233				 enum btrfs_exclusive_operation type);
3234void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
3235void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
3236
3237/* file.c */
3238int __init btrfs_auto_defrag_init(void);
3239void __cold btrfs_auto_defrag_exit(void);
3240int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3241			   struct btrfs_inode *inode);
3242int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3243void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3244int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3245void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end,
3246			     int skip_pinned);
3247extern const struct file_operations btrfs_file_operations;
3248int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3249		       struct btrfs_root *root, struct btrfs_inode *inode,
3250		       struct btrfs_drop_extents_args *args);
3251int btrfs_replace_file_extents(struct btrfs_inode *inode,
3252			   struct btrfs_path *path, const u64 start,
3253			   const u64 end,
3254			   struct btrfs_replace_extent_info *extent_info,
3255			   struct btrfs_trans_handle **trans_out);
3256int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3257			      struct btrfs_inode *inode, u64 start, u64 end);
3258int btrfs_release_file(struct inode *inode, struct file *file);
3259int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages,
3260		      size_t num_pages, loff_t pos, size_t write_bytes,
3261		      struct extent_state **cached, bool noreserve);
3262int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3263int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
3264			   size_t *write_bytes);
3265void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
3266
3267/* tree-defrag.c */
3268int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3269			struct btrfs_root *root);
3270
3271/* super.c */
3272int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3273			unsigned long new_flags);
3274int btrfs_sync_fs(struct super_block *sb, int wait);
3275char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
3276					  u64 subvol_objectid);
3277
3278static inline __printf(2, 3) __cold
3279void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3280{
3281}
3282
3283#ifdef CONFIG_PRINTK
3284__printf(2, 3)
3285__cold
3286void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3287#else
3288#define btrfs_printk(fs_info, fmt, args...) \
3289	btrfs_no_printk(fs_info, fmt, ##args)
3290#endif
3291
3292#define btrfs_emerg(fs_info, fmt, args...) \
3293	btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3294#define btrfs_alert(fs_info, fmt, args...) \
3295	btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3296#define btrfs_crit(fs_info, fmt, args...) \
3297	btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3298#define btrfs_err(fs_info, fmt, args...) \
3299	btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3300#define btrfs_warn(fs_info, fmt, args...) \
3301	btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3302#define btrfs_notice(fs_info, fmt, args...) \
3303	btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3304#define btrfs_info(fs_info, fmt, args...) \
3305	btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3306
3307/*
3308 * Wrappers that use printk_in_rcu
3309 */
3310#define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3311	btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3312#define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3313	btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3314#define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3315	btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3316#define btrfs_err_in_rcu(fs_info, fmt, args...) \
3317	btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3318#define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3319	btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3320#define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3321	btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3322#define btrfs_info_in_rcu(fs_info, fmt, args...) \
3323	btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3324
3325/*
3326 * Wrappers that use a ratelimited printk_in_rcu
3327 */
3328#define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3329	btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3330#define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3331	btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3332#define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3333	btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3334#define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3335	btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3336#define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3337	btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3338#define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3339	btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3340#define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3341	btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3342
3343/*
3344 * Wrappers that use a ratelimited printk
3345 */
3346#define btrfs_emerg_rl(fs_info, fmt, args...) \
3347	btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3348#define btrfs_alert_rl(fs_info, fmt, args...) \
3349	btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3350#define btrfs_crit_rl(fs_info, fmt, args...) \
3351	btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3352#define btrfs_err_rl(fs_info, fmt, args...) \
3353	btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3354#define btrfs_warn_rl(fs_info, fmt, args...) \
3355	btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3356#define btrfs_notice_rl(fs_info, fmt, args...) \
3357	btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3358#define btrfs_info_rl(fs_info, fmt, args...) \
3359	btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3360
3361#if defined(CONFIG_DYNAMIC_DEBUG)
3362#define btrfs_debug(fs_info, fmt, args...)				\
3363	_dynamic_func_call_no_desc(fmt, btrfs_printk,			\
3364				   fs_info, KERN_DEBUG fmt, ##args)
3365#define btrfs_debug_in_rcu(fs_info, fmt, args...)			\
3366	_dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu,		\
3367				   fs_info, KERN_DEBUG fmt, ##args)
3368#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...)			\
3369	_dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu,		\
3370				   fs_info, KERN_DEBUG fmt, ##args)
3371#define btrfs_debug_rl(fs_info, fmt, args...)				\
3372	_dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited,	\
3373				   fs_info, KERN_DEBUG fmt, ##args)
3374#elif defined(DEBUG)
3375#define btrfs_debug(fs_info, fmt, args...) \
3376	btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3377#define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3378	btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3379#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3380	btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3381#define btrfs_debug_rl(fs_info, fmt, args...) \
3382	btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3383#else
3384#define btrfs_debug(fs_info, fmt, args...) \
3385	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3386#define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3387	btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3388#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3389	btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3390#define btrfs_debug_rl(fs_info, fmt, args...) \
3391	btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3392#endif
3393
3394#define btrfs_printk_in_rcu(fs_info, fmt, args...)	\
3395do {							\
3396	rcu_read_lock();				\
3397	btrfs_printk(fs_info, fmt, ##args);		\
3398	rcu_read_unlock();				\
3399} while (0)
3400
3401#define btrfs_no_printk_in_rcu(fs_info, fmt, args...)	\
3402do {							\
3403	rcu_read_lock();				\
3404	btrfs_no_printk(fs_info, fmt, ##args);		\
3405	rcu_read_unlock();				\
3406} while (0)
3407
3408#define btrfs_printk_ratelimited(fs_info, fmt, args...)		\
3409do {								\
3410	static DEFINE_RATELIMIT_STATE(_rs,			\
3411		DEFAULT_RATELIMIT_INTERVAL,			\
3412		DEFAULT_RATELIMIT_BURST);       		\
3413	if (__ratelimit(&_rs))					\
3414		btrfs_printk(fs_info, fmt, ##args);		\
3415} while (0)
3416
3417#define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)		\
3418do {								\
3419	rcu_read_lock();					\
3420	btrfs_printk_ratelimited(fs_info, fmt, ##args);		\
3421	rcu_read_unlock();					\
3422} while (0)
3423
3424#ifdef CONFIG_BTRFS_ASSERT
3425__cold __noreturn
3426static inline void assertfail(const char *expr, const char *file, int line)
3427{
3428	pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
3429	BUG();
3430}
3431
3432#define ASSERT(expr)						\
3433	(likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
3434
3435#else
3436static inline void assertfail(const char *expr, const char* file, int line) { }
3437#define ASSERT(expr)	(void)(expr)
3438#endif
3439
3440#if BITS_PER_LONG == 32
3441#define BTRFS_32BIT_MAX_FILE_SIZE (((u64)ULONG_MAX + 1) << PAGE_SHIFT)
3442/*
3443 * The warning threshold is 5/8th of the MAX_LFS_FILESIZE that limits the logical
3444 * addresses of extents.
3445 *
3446 * For 4K page size it's about 10T, for 64K it's 160T.
3447 */
3448#define BTRFS_32BIT_EARLY_WARN_THRESHOLD (BTRFS_32BIT_MAX_FILE_SIZE * 5 / 8)
3449void btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info);
3450void btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info);
3451#endif
3452
3453/*
3454 * Get the correct offset inside the page of extent buffer.
3455 *
3456 * @eb:		target extent buffer
3457 * @start:	offset inside the extent buffer
3458 *
3459 * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases.
3460 */
3461static inline size_t get_eb_offset_in_page(const struct extent_buffer *eb,
3462					   unsigned long offset)
3463{
3464	/*
3465	 * For sectorsize == PAGE_SIZE case, eb->start will always be aligned
3466	 * to PAGE_SIZE, thus adding it won't cause any difference.
3467	 *
3468	 * For sectorsize < PAGE_SIZE, we must only read the data that belongs
3469	 * to the eb, thus we have to take the eb->start into consideration.
3470	 */
3471	return offset_in_page(offset + eb->start);
3472}
3473
3474static inline unsigned long get_eb_page_index(unsigned long offset)
3475{
3476	/*
3477	 * For sectorsize == PAGE_SIZE case, plain >> PAGE_SHIFT is enough.
3478	 *
3479	 * For sectorsize < PAGE_SIZE case, we only support 64K PAGE_SIZE,
3480	 * and have ensured that all tree blocks are contained in one page,
3481	 * thus we always get index == 0.
3482	 */
3483	return offset >> PAGE_SHIFT;
3484}
3485
3486/*
3487 * Use that for functions that are conditionally exported for sanity tests but
3488 * otherwise static
3489 */
3490#ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3491#define EXPORT_FOR_TESTS static
3492#else
3493#define EXPORT_FOR_TESTS
3494#endif
3495
3496__cold
3497static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
3498{
3499	btrfs_err(fs_info,
3500"Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
3501}
3502
3503__printf(5, 6)
3504__cold
3505void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3506		     unsigned int line, int errno, const char *fmt, ...);
3507
3508const char * __attribute_const__ btrfs_decode_error(int errno);
3509
3510__cold
3511void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3512			       const char *function,
3513			       unsigned int line, int errno);
3514
3515/*
3516 * Call btrfs_abort_transaction as early as possible when an error condition is
3517 * detected, that way the exact line number is reported.
3518 */
3519#define btrfs_abort_transaction(trans, errno)		\
3520do {								\
3521	/* Report first abort since mount */			\
3522	if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED,	\
3523			&((trans)->fs_info->fs_state))) {	\
3524		if ((errno) != -EIO && (errno) != -EROFS) {		\
3525			WARN(1, KERN_DEBUG				\
3526			"BTRFS: Transaction aborted (error %d)\n",	\
3527			(errno));					\
3528		} else {						\
3529			btrfs_debug((trans)->fs_info,			\
3530				    "Transaction aborted (error %d)", \
3531				  (errno));			\
3532		}						\
3533	}							\
3534	__btrfs_abort_transaction((trans), __func__,		\
3535				  __LINE__, (errno));		\
3536} while (0)
3537
3538#define btrfs_handle_fs_error(fs_info, errno, fmt, args...)		\
3539do {								\
3540	__btrfs_handle_fs_error((fs_info), __func__, __LINE__,	\
3541			  (errno), fmt, ##args);		\
3542} while (0)
3543
3544__printf(5, 6)
3545__cold
3546void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3547		   unsigned int line, int errno, const char *fmt, ...);
3548/*
3549 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3550 * will panic().  Otherwise we BUG() here.
3551 */
3552#define btrfs_panic(fs_info, errno, fmt, args...)			\
3553do {									\
3554	__btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args);	\
3555	BUG();								\
3556} while (0)
3557
3558
3559/* compatibility and incompatibility defines */
3560
3561#define btrfs_set_fs_incompat(__fs_info, opt) \
3562	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3563				#opt)
3564
3565static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3566					   u64 flag, const char* name)
3567{
3568	struct btrfs_super_block *disk_super;
3569	u64 features;
3570
3571	disk_super = fs_info->super_copy;
3572	features = btrfs_super_incompat_flags(disk_super);
3573	if (!(features & flag)) {
3574		spin_lock(&fs_info->super_lock);
3575		features = btrfs_super_incompat_flags(disk_super);
3576		if (!(features & flag)) {
3577			features |= flag;
3578			btrfs_set_super_incompat_flags(disk_super, features);
3579			btrfs_info(fs_info,
3580				"setting incompat feature flag for %s (0x%llx)",
3581				name, flag);
3582		}
3583		spin_unlock(&fs_info->super_lock);
3584	}
3585}
3586
3587#define btrfs_clear_fs_incompat(__fs_info, opt) \
3588	__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
3589				  #opt)
3590
3591static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3592					     u64 flag, const char* name)
3593{
3594	struct btrfs_super_block *disk_super;
3595	u64 features;
3596
3597	disk_super = fs_info->super_copy;
3598	features = btrfs_super_incompat_flags(disk_super);
3599	if (features & flag) {
3600		spin_lock(&fs_info->super_lock);
3601		features = btrfs_super_incompat_flags(disk_super);
3602		if (features & flag) {
3603			features &= ~flag;
3604			btrfs_set_super_incompat_flags(disk_super, features);
3605			btrfs_info(fs_info,
3606				"clearing incompat feature flag for %s (0x%llx)",
3607				name, flag);
3608		}
3609		spin_unlock(&fs_info->super_lock);
3610	}
3611}
3612
3613#define btrfs_fs_incompat(fs_info, opt) \
3614	__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3615
3616static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3617{
3618	struct btrfs_super_block *disk_super;
3619	disk_super = fs_info->super_copy;
3620	return !!(btrfs_super_incompat_flags(disk_super) & flag);
3621}
3622
3623#define btrfs_set_fs_compat_ro(__fs_info, opt) \
3624	__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3625				 #opt)
3626
3627static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3628					    u64 flag, const char *name)
3629{
3630	struct btrfs_super_block *disk_super;
3631	u64 features;
3632
3633	disk_super = fs_info->super_copy;
3634	features = btrfs_super_compat_ro_flags(disk_super);
3635	if (!(features & flag)) {
3636		spin_lock(&fs_info->super_lock);
3637		features = btrfs_super_compat_ro_flags(disk_super);
3638		if (!(features & flag)) {
3639			features |= flag;
3640			btrfs_set_super_compat_ro_flags(disk_super, features);
3641			btrfs_info(fs_info,
3642				"setting compat-ro feature flag for %s (0x%llx)",
3643				name, flag);
3644		}
3645		spin_unlock(&fs_info->super_lock);
3646	}
3647}
3648
3649#define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3650	__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
3651				   #opt)
3652
3653static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3654					      u64 flag, const char *name)
3655{
3656	struct btrfs_super_block *disk_super;
3657	u64 features;
3658
3659	disk_super = fs_info->super_copy;
3660	features = btrfs_super_compat_ro_flags(disk_super);
3661	if (features & flag) {
3662		spin_lock(&fs_info->super_lock);
3663		features = btrfs_super_compat_ro_flags(disk_super);
3664		if (features & flag) {
3665			features &= ~flag;
3666			btrfs_set_super_compat_ro_flags(disk_super, features);
3667			btrfs_info(fs_info,
3668				"clearing compat-ro feature flag for %s (0x%llx)",
3669				name, flag);
3670		}
3671		spin_unlock(&fs_info->super_lock);
3672	}
3673}
3674
3675#define btrfs_fs_compat_ro(fs_info, opt) \
3676	__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3677
3678static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3679{
3680	struct btrfs_super_block *disk_super;
3681	disk_super = fs_info->super_copy;
3682	return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3683}
3684
3685/* acl.c */
3686#ifdef CONFIG_BTRFS_FS_POSIX_ACL
3687struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3688int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
3689		  struct posix_acl *acl, int type);
3690int btrfs_init_acl(struct btrfs_trans_handle *trans,
3691		   struct inode *inode, struct inode *dir);
3692#else
3693#define btrfs_get_acl NULL
3694#define btrfs_set_acl NULL
3695static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3696				 struct inode *inode, struct inode *dir)
3697{
3698	return 0;
3699}
3700#endif
3701
3702/* relocation.c */
3703int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3704int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3705			  struct btrfs_root *root);
3706int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3707			    struct btrfs_root *root);
3708int btrfs_recover_relocation(struct btrfs_root *root);
3709int btrfs_reloc_clone_csums(struct btrfs_inode *inode, u64 file_pos, u64 len);
3710int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3711			  struct btrfs_root *root, struct extent_buffer *buf,
3712			  struct extent_buffer *cow);
3713void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3714			      u64 *bytes_to_reserve);
3715int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3716			      struct btrfs_pending_snapshot *pending);
3717int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info);
3718struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info,
3719				   u64 bytenr);
3720int btrfs_should_ignore_reloc_root(struct btrfs_root *root);
3721
3722/* scrub.c */
3723int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3724		    u64 end, struct btrfs_scrub_progress *progress,
3725		    int readonly, int is_dev_replace);
3726void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3727void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3728int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3729int btrfs_scrub_cancel_dev(struct btrfs_device *dev);
3730int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3731			 struct btrfs_scrub_progress *progress);
3732static inline void btrfs_init_full_stripe_locks_tree(
3733			struct btrfs_full_stripe_locks_tree *locks_root)
3734{
3735	locks_root->root = RB_ROOT;
3736	mutex_init(&locks_root->lock);
3737}
3738
3739/* dev-replace.c */
3740void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3741void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3742void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3743
3744static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3745{
3746	btrfs_bio_counter_sub(fs_info, 1);
3747}
3748
3749/* reada.c */
3750struct reada_control {
3751	struct btrfs_fs_info	*fs_info;		/* tree to prefetch */
3752	struct btrfs_key	key_start;
3753	struct btrfs_key	key_end;	/* exclusive */
3754	atomic_t		elems;
3755	struct kref		refcnt;
3756	wait_queue_head_t	wait;
3757};
3758struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3759			      struct btrfs_key *start, struct btrfs_key *end);
3760int btrfs_reada_wait(void *handle);
3761void btrfs_reada_detach(void *handle);
3762int btree_readahead_hook(struct extent_buffer *eb, int err);
3763void btrfs_reada_remove_dev(struct btrfs_device *dev);
3764void btrfs_reada_undo_remove_dev(struct btrfs_device *dev);
3765
3766static inline int is_fstree(u64 rootid)
3767{
3768	if (rootid == BTRFS_FS_TREE_OBJECTID ||
3769	    ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3770	      !btrfs_qgroup_level(rootid)))
3771		return 1;
3772	return 0;
3773}
3774
3775static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3776{
3777	return signal_pending(current);
3778}
3779
3780/* Sanity test specific functions */
3781#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3782void btrfs_test_destroy_inode(struct inode *inode);
3783static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3784{
3785	return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
3786}
3787#else
3788static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3789{
3790	return 0;
3791}
3792#endif
3793
3794static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
3795{
3796	return fs_info->zoned != 0;
3797}
3798
3799/*
3800 * We use page status Private2 to indicate there is an ordered extent with
3801 * unfinished IO.
3802 *
3803 * Rename the Private2 accessors to Ordered, to improve readability.
3804 */
3805#define PageOrdered(page)		PagePrivate2(page)
3806#define SetPageOrdered(page)		SetPagePrivate2(page)
3807#define ClearPageOrdered(page)		ClearPagePrivate2(page)
3808
3809#endif
3810