xref: /linux/fs/btrfs/fs.h (revision 31ceedee8aa4559494d2ebb85c484efff6f5afa1)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #ifndef BTRFS_FS_H
4 #define BTRFS_FS_H
5 
6 #include <linux/blkdev.h>
7 #include <linux/fs.h>
8 #include <linux/btrfs_tree.h>
9 #include <linux/sizes.h>
10 #include "extent-io-tree.h"
11 #include "extent_map.h"
12 #include "async-thread.h"
13 #include "block-rsv.h"
14 
15 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
16 
17 #define BTRFS_OLDEST_GENERATION	0ULL
18 
19 #define BTRFS_EMPTY_DIR_SIZE 0
20 
21 #define BTRFS_DIRTY_METADATA_THRESH		SZ_32M
22 
23 #define BTRFS_SUPER_INFO_OFFSET			SZ_64K
24 #define BTRFS_SUPER_INFO_SIZE			4096
25 static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE);
26 
27 /*
28  * Number of metadata items necessary for an unlink operation:
29  *
30  * 1 for the possible orphan item
31  * 1 for the dir item
32  * 1 for the dir index
33  * 1 for the inode ref
34  * 1 for the inode
35  * 1 for the parent inode
36  */
37 #define BTRFS_UNLINK_METADATA_UNITS		6
38 
39 /*
40  * The reserved space at the beginning of each device.  It covers the primary
41  * super block and leaves space for potential use by other tools like
42  * bootloaders or to lower potential damage of accidental overwrite.
43  */
44 #define BTRFS_DEVICE_RANGE_RESERVED			(SZ_1M)
45 /*
46  * Runtime (in-memory) states of filesystem
47  */
48 enum {
49 	/* Global indicator of serious filesystem errors */
50 	BTRFS_FS_STATE_ERROR,
51 	/*
52 	 * Filesystem is being remounted, allow to skip some operations, like
53 	 * defrag
54 	 */
55 	BTRFS_FS_STATE_REMOUNTING,
56 	/* Filesystem in RO mode */
57 	BTRFS_FS_STATE_RO,
58 	/* Track if a transaction abort has been reported on this filesystem */
59 	BTRFS_FS_STATE_TRANS_ABORTED,
60 	/*
61 	 * Bio operations should be blocked on this filesystem because a source
62 	 * or target device is being destroyed as part of a device replace
63 	 */
64 	BTRFS_FS_STATE_DEV_REPLACING,
65 	/* The btrfs_fs_info created for self-tests */
66 	BTRFS_FS_STATE_DUMMY_FS_INFO,
67 
68 	BTRFS_FS_STATE_NO_CSUMS,
69 
70 	/* Indicates there was an error cleaning up a log tree. */
71 	BTRFS_FS_STATE_LOG_CLEANUP_ERROR,
72 
73 	BTRFS_FS_STATE_COUNT
74 };
75 
76 enum {
77 	BTRFS_FS_CLOSING_START,
78 	BTRFS_FS_CLOSING_DONE,
79 	BTRFS_FS_LOG_RECOVERING,
80 	BTRFS_FS_OPEN,
81 	BTRFS_FS_QUOTA_ENABLED,
82 	BTRFS_FS_UPDATE_UUID_TREE_GEN,
83 	BTRFS_FS_CREATING_FREE_SPACE_TREE,
84 	BTRFS_FS_BTREE_ERR,
85 	BTRFS_FS_LOG1_ERR,
86 	BTRFS_FS_LOG2_ERR,
87 	BTRFS_FS_QUOTA_OVERRIDE,
88 	/* Used to record internally whether fs has been frozen */
89 	BTRFS_FS_FROZEN,
90 	/*
91 	 * Indicate that balance has been set up from the ioctl and is in the
92 	 * main phase. The fs_info::balance_ctl is initialized.
93 	 */
94 	BTRFS_FS_BALANCE_RUNNING,
95 
96 	/*
97 	 * Indicate that relocation of a chunk has started, it's set per chunk
98 	 * and is toggled between chunks.
99 	 */
100 	BTRFS_FS_RELOC_RUNNING,
101 
102 	/* Indicate that the cleaner thread is awake and doing something. */
103 	BTRFS_FS_CLEANER_RUNNING,
104 
105 	/*
106 	 * The checksumming has an optimized version and is considered fast,
107 	 * so we don't need to offload checksums to workqueues.
108 	 */
109 	BTRFS_FS_CSUM_IMPL_FAST,
110 
111 	/* Indicate that the discard workqueue can service discards. */
112 	BTRFS_FS_DISCARD_RUNNING,
113 
114 	/* Indicate that we need to cleanup space cache v1 */
115 	BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
116 
117 	/* Indicate that we can't trust the free space tree for caching yet */
118 	BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
119 
120 	/* Indicate whether there are any tree modification log users */
121 	BTRFS_FS_TREE_MOD_LOG_USERS,
122 
123 	/* Indicate that we want the transaction kthread to commit right now. */
124 	BTRFS_FS_COMMIT_TRANS,
125 
126 	/* Indicate we have half completed snapshot deletions pending. */
127 	BTRFS_FS_UNFINISHED_DROPS,
128 
129 	/* Indicate we have to finish a zone to do next allocation. */
130 	BTRFS_FS_NEED_ZONE_FINISH,
131 
132 	/* Indicate that we want to commit the transaction. */
133 	BTRFS_FS_NEED_TRANS_COMMIT,
134 
135 	/* This is set when active zone tracking is needed. */
136 	BTRFS_FS_ACTIVE_ZONE_TRACKING,
137 
138 	/*
139 	 * Indicate if we have some features changed, this is mostly for
140 	 * cleaner thread to update the sysfs interface.
141 	 */
142 	BTRFS_FS_FEATURE_CHANGED,
143 
144 #if BITS_PER_LONG == 32
145 	/* Indicate if we have error/warn message printed on 32bit systems */
146 	BTRFS_FS_32BIT_ERROR,
147 	BTRFS_FS_32BIT_WARN,
148 #endif
149 };
150 
151 /*
152  * Flags for mount options.
153  *
154  * Note: don't forget to add new options to btrfs_show_options()
155  */
156 enum {
157 	BTRFS_MOUNT_NODATASUM			= (1UL << 0),
158 	BTRFS_MOUNT_NODATACOW			= (1UL << 1),
159 	BTRFS_MOUNT_NOBARRIER			= (1UL << 2),
160 	BTRFS_MOUNT_SSD				= (1UL << 3),
161 	BTRFS_MOUNT_DEGRADED			= (1UL << 4),
162 	BTRFS_MOUNT_COMPRESS			= (1UL << 5),
163 	BTRFS_MOUNT_NOTREELOG   		= (1UL << 6),
164 	BTRFS_MOUNT_FLUSHONCOMMIT		= (1UL << 7),
165 	BTRFS_MOUNT_SSD_SPREAD			= (1UL << 8),
166 	BTRFS_MOUNT_NOSSD			= (1UL << 9),
167 	BTRFS_MOUNT_DISCARD_SYNC		= (1UL << 10),
168 	BTRFS_MOUNT_FORCE_COMPRESS      	= (1UL << 11),
169 	BTRFS_MOUNT_SPACE_CACHE			= (1UL << 12),
170 	BTRFS_MOUNT_CLEAR_CACHE			= (1UL << 13),
171 	BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED	= (1UL << 14),
172 	BTRFS_MOUNT_ENOSPC_DEBUG		= (1UL << 15),
173 	BTRFS_MOUNT_AUTO_DEFRAG			= (1UL << 16),
174 	BTRFS_MOUNT_USEBACKUPROOT		= (1UL << 17),
175 	BTRFS_MOUNT_SKIP_BALANCE		= (1UL << 18),
176 	BTRFS_MOUNT_CHECK_INTEGRITY		= (1UL << 19),
177 	BTRFS_MOUNT_CHECK_INTEGRITY_DATA	= (1UL << 20),
178 	BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	= (1UL << 21),
179 	BTRFS_MOUNT_RESCAN_UUID_TREE		= (1UL << 22),
180 	BTRFS_MOUNT_FRAGMENT_DATA		= (1UL << 23),
181 	BTRFS_MOUNT_FRAGMENT_METADATA		= (1UL << 24),
182 	BTRFS_MOUNT_FREE_SPACE_TREE		= (1UL << 25),
183 	BTRFS_MOUNT_NOLOGREPLAY			= (1UL << 26),
184 	BTRFS_MOUNT_REF_VERIFY			= (1UL << 27),
185 	BTRFS_MOUNT_DISCARD_ASYNC		= (1UL << 28),
186 	BTRFS_MOUNT_IGNOREBADROOTS		= (1UL << 29),
187 	BTRFS_MOUNT_IGNOREDATACSUMS		= (1UL << 30),
188 	BTRFS_MOUNT_NODISCARD			= (1UL << 31),
189 };
190 
191 /*
192  * Compat flags that we support.  If any incompat flags are set other than the
193  * ones specified below then we will fail to mount
194  */
195 #define BTRFS_FEATURE_COMPAT_SUPP		0ULL
196 #define BTRFS_FEATURE_COMPAT_SAFE_SET		0ULL
197 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR		0ULL
198 
199 #define BTRFS_FEATURE_COMPAT_RO_SUPP			\
200 	(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |	\
201 	 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
202 	 BTRFS_FEATURE_COMPAT_RO_VERITY |		\
203 	 BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE)
204 
205 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET	0ULL
206 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR	0ULL
207 
208 #define BTRFS_FEATURE_INCOMPAT_SUPP_STABLE		\
209 	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |		\
210 	 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |	\
211 	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
212 	 BTRFS_FEATURE_INCOMPAT_BIG_METADATA |		\
213 	 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |		\
214 	 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |		\
215 	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
216 	 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
217 	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
218 	 BTRFS_FEATURE_INCOMPAT_NO_HOLES	|	\
219 	 BTRFS_FEATURE_INCOMPAT_METADATA_UUID	|	\
220 	 BTRFS_FEATURE_INCOMPAT_RAID1C34	|	\
221 	 BTRFS_FEATURE_INCOMPAT_ZONED)
222 
223 #ifdef CONFIG_BTRFS_DEBUG
224 	/*
225 	 * Features under developmen like Extent tree v2 support is enabled
226 	 * only under CONFIG_BTRFS_DEBUG.
227 	 */
228 #define BTRFS_FEATURE_INCOMPAT_SUPP		\
229 	(BTRFS_FEATURE_INCOMPAT_SUPP_STABLE |	\
230 	 BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2)
231 
232 #else
233 
234 #define BTRFS_FEATURE_INCOMPAT_SUPP		\
235 	(BTRFS_FEATURE_INCOMPAT_SUPP_STABLE)
236 
237 #endif
238 
239 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET			\
240 	(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
241 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR		0ULL
242 
243 #define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)
244 #define BTRFS_DEFAULT_MAX_INLINE	(2048)
245 
246 struct btrfs_dev_replace {
247 	/* See #define above */
248 	u64 replace_state;
249 	/* Seconds since 1-Jan-1970 */
250 	time64_t time_started;
251 	/* Seconds since 1-Jan-1970 */
252 	time64_t time_stopped;
253 	atomic64_t num_write_errors;
254 	atomic64_t num_uncorrectable_read_errors;
255 
256 	u64 cursor_left;
257 	u64 committed_cursor_left;
258 	u64 cursor_left_last_write_of_item;
259 	u64 cursor_right;
260 
261 	/* See #define above */
262 	u64 cont_reading_from_srcdev_mode;
263 
264 	int is_valid;
265 	int item_needs_writeback;
266 	struct btrfs_device *srcdev;
267 	struct btrfs_device *tgtdev;
268 
269 	struct mutex lock_finishing_cancel_unmount;
270 	struct rw_semaphore rwsem;
271 
272 	struct btrfs_scrub_progress scrub_progress;
273 
274 	struct percpu_counter bio_counter;
275 	wait_queue_head_t replace_wait;
276 };
277 
278 /*
279  * Free clusters are used to claim free space in relatively large chunks,
280  * allowing us to do less seeky writes. They are used for all metadata
281  * allocations. In ssd_spread mode they are also used for data allocations.
282  */
283 struct btrfs_free_cluster {
284 	spinlock_t lock;
285 	spinlock_t refill_lock;
286 	struct rb_root root;
287 
288 	/* Largest extent in this cluster */
289 	u64 max_size;
290 
291 	/* First extent starting offset */
292 	u64 window_start;
293 
294 	/* We did a full search and couldn't create a cluster */
295 	bool fragmented;
296 
297 	struct btrfs_block_group *block_group;
298 	/*
299 	 * When a cluster is allocated from a block group, we put the cluster
300 	 * onto a list in the block group so that it can be freed before the
301 	 * block group is freed.
302 	 */
303 	struct list_head block_group_list;
304 };
305 
306 /* Discard control. */
307 /*
308  * Async discard uses multiple lists to differentiate the discard filter
309  * parameters.  Index 0 is for completely free block groups where we need to
310  * ensure the entire block group is trimmed without being lossy.  Indices
311  * afterwards represent monotonically decreasing discard filter sizes to
312  * prioritize what should be discarded next.
313  */
314 #define BTRFS_NR_DISCARD_LISTS		3
315 #define BTRFS_DISCARD_INDEX_UNUSED	0
316 #define BTRFS_DISCARD_INDEX_START	1
317 
318 struct btrfs_discard_ctl {
319 	struct workqueue_struct *discard_workers;
320 	struct delayed_work work;
321 	spinlock_t lock;
322 	struct btrfs_block_group *block_group;
323 	struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
324 	u64 prev_discard;
325 	u64 prev_discard_time;
326 	atomic_t discardable_extents;
327 	atomic64_t discardable_bytes;
328 	u64 max_discard_size;
329 	u64 delay_ms;
330 	u32 iops_limit;
331 	u32 kbps_limit;
332 	u64 discard_extent_bytes;
333 	u64 discard_bitmap_bytes;
334 	atomic64_t discard_bytes_saved;
335 };
336 
337 /*
338  * Exclusive operations (device replace, resize, device add/remove, balance)
339  */
340 enum btrfs_exclusive_operation {
341 	BTRFS_EXCLOP_NONE,
342 	BTRFS_EXCLOP_BALANCE_PAUSED,
343 	BTRFS_EXCLOP_BALANCE,
344 	BTRFS_EXCLOP_DEV_ADD,
345 	BTRFS_EXCLOP_DEV_REMOVE,
346 	BTRFS_EXCLOP_DEV_REPLACE,
347 	BTRFS_EXCLOP_RESIZE,
348 	BTRFS_EXCLOP_SWAP_ACTIVATE,
349 };
350 
351 /* Store data about transaction commits, exported via sysfs. */
352 struct btrfs_commit_stats {
353 	/* Total number of commits */
354 	u64 commit_count;
355 	/* The maximum commit duration so far in ns */
356 	u64 max_commit_dur;
357 	/* The last commit duration in ns */
358 	u64 last_commit_dur;
359 	/* The total commit duration in ns */
360 	u64 total_commit_dur;
361 };
362 
363 struct btrfs_fs_info {
364 	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
365 	unsigned long flags;
366 	struct btrfs_root *tree_root;
367 	struct btrfs_root *chunk_root;
368 	struct btrfs_root *dev_root;
369 	struct btrfs_root *fs_root;
370 	struct btrfs_root *quota_root;
371 	struct btrfs_root *uuid_root;
372 	struct btrfs_root *data_reloc_root;
373 	struct btrfs_root *block_group_root;
374 
375 	/* The log root tree is a directory of all the other log roots */
376 	struct btrfs_root *log_root_tree;
377 
378 	/* The tree that holds the global roots (csum, extent, etc) */
379 	rwlock_t global_root_lock;
380 	struct rb_root global_root_tree;
381 
382 	spinlock_t fs_roots_radix_lock;
383 	struct radix_tree_root fs_roots_radix;
384 
385 	/* Block group cache stuff */
386 	rwlock_t block_group_cache_lock;
387 	struct rb_root_cached block_group_cache_tree;
388 
389 	/* Keep track of unallocated space */
390 	atomic64_t free_chunk_space;
391 
392 	/* Track ranges which are used by log trees blocks/logged data extents */
393 	struct extent_io_tree excluded_extents;
394 
395 	/* logical->physical extent mapping */
396 	struct extent_map_tree mapping_tree;
397 
398 	/*
399 	 * Block reservation for extent, checksum, root tree and delayed dir
400 	 * index item.
401 	 */
402 	struct btrfs_block_rsv global_block_rsv;
403 	/* Block reservation for metadata operations */
404 	struct btrfs_block_rsv trans_block_rsv;
405 	/* Block reservation for chunk tree */
406 	struct btrfs_block_rsv chunk_block_rsv;
407 	/* Block reservation for delayed operations */
408 	struct btrfs_block_rsv delayed_block_rsv;
409 	/* Block reservation for delayed refs */
410 	struct btrfs_block_rsv delayed_refs_rsv;
411 
412 	struct btrfs_block_rsv empty_block_rsv;
413 
414 	u64 generation;
415 	u64 last_trans_committed;
416 	/*
417 	 * Generation of the last transaction used for block group relocation
418 	 * since the filesystem was last mounted (or 0 if none happened yet).
419 	 * Must be written and read while holding btrfs_fs_info::commit_root_sem.
420 	 */
421 	u64 last_reloc_trans;
422 
423 	/*
424 	 * This is updated to the current trans every time a full commit is
425 	 * required instead of the faster short fsync log commits
426 	 */
427 	u64 last_trans_log_full_commit;
428 	unsigned long mount_opt;
429 
430 	unsigned long compress_type:4;
431 	unsigned int compress_level;
432 	u32 commit_interval;
433 	/*
434 	 * It is a suggestive number, the read side is safe even it gets a
435 	 * wrong number because we will write out the data into a regular
436 	 * extent. The write side(mount/remount) is under ->s_umount lock,
437 	 * so it is also safe.
438 	 */
439 	u64 max_inline;
440 
441 	struct btrfs_transaction *running_transaction;
442 	wait_queue_head_t transaction_throttle;
443 	wait_queue_head_t transaction_wait;
444 	wait_queue_head_t transaction_blocked_wait;
445 	wait_queue_head_t async_submit_wait;
446 
447 	/*
448 	 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
449 	 * when they are updated.
450 	 *
451 	 * Because we do not clear the flags for ever, so we needn't use
452 	 * the lock on the read side.
453 	 *
454 	 * We also needn't use the lock when we mount the fs, because
455 	 * there is no other task which will update the flag.
456 	 */
457 	spinlock_t super_lock;
458 	struct btrfs_super_block *super_copy;
459 	struct btrfs_super_block *super_for_commit;
460 	struct super_block *sb;
461 	struct inode *btree_inode;
462 	struct mutex tree_log_mutex;
463 	struct mutex transaction_kthread_mutex;
464 	struct mutex cleaner_mutex;
465 	struct mutex chunk_mutex;
466 
467 	/*
468 	 * This is taken to make sure we don't set block groups ro after the
469 	 * free space cache has been allocated on them.
470 	 */
471 	struct mutex ro_block_group_mutex;
472 
473 	/*
474 	 * This is used during read/modify/write to make sure no two ios are
475 	 * trying to mod the same stripe at the same time.
476 	 */
477 	struct btrfs_stripe_hash_table *stripe_hash_table;
478 
479 	/*
480 	 * This protects the ordered operations list only while we are
481 	 * processing all of the entries on it.  This way we make sure the
482 	 * commit code doesn't find the list temporarily empty because another
483 	 * function happens to be doing non-waiting preflush before jumping
484 	 * into the main commit.
485 	 */
486 	struct mutex ordered_operations_mutex;
487 
488 	struct rw_semaphore commit_root_sem;
489 
490 	struct rw_semaphore cleanup_work_sem;
491 
492 	struct rw_semaphore subvol_sem;
493 
494 	spinlock_t trans_lock;
495 	/*
496 	 * The reloc mutex goes with the trans lock, it is taken during commit
497 	 * to protect us from the relocation code.
498 	 */
499 	struct mutex reloc_mutex;
500 
501 	struct list_head trans_list;
502 	struct list_head dead_roots;
503 	struct list_head caching_block_groups;
504 
505 	spinlock_t delayed_iput_lock;
506 	struct list_head delayed_iputs;
507 	atomic_t nr_delayed_iputs;
508 	wait_queue_head_t delayed_iputs_wait;
509 
510 	atomic64_t tree_mod_seq;
511 
512 	/* This protects tree_mod_log and tree_mod_seq_list */
513 	rwlock_t tree_mod_log_lock;
514 	struct rb_root tree_mod_log;
515 	struct list_head tree_mod_seq_list;
516 
517 	atomic_t async_delalloc_pages;
518 
519 	/* This is used to protect the following list -- ordered_roots. */
520 	spinlock_t ordered_root_lock;
521 
522 	/*
523 	 * All fs/file tree roots in which there are data=ordered extents
524 	 * pending writeback are added into this list.
525 	 *
526 	 * These can span multiple transactions and basically include every
527 	 * dirty data page that isn't from nodatacow.
528 	 */
529 	struct list_head ordered_roots;
530 
531 	struct mutex delalloc_root_mutex;
532 	spinlock_t delalloc_root_lock;
533 	/* All fs/file tree roots that have delalloc inodes. */
534 	struct list_head delalloc_roots;
535 
536 	/*
537 	 * There is a pool of worker threads for checksumming during writes and
538 	 * a pool for checksumming after reads.  This is because readers can
539 	 * run with FS locks held, and the writers may be waiting for those
540 	 * locks.  We don't want ordering in the pending list to cause
541 	 * deadlocks, and so the two are serviced separately.
542 	 *
543 	 * A third pool does submit_bio to avoid deadlocking with the other two.
544 	 */
545 	struct btrfs_workqueue *workers;
546 	struct btrfs_workqueue *delalloc_workers;
547 	struct btrfs_workqueue *flush_workers;
548 	struct workqueue_struct *endio_workers;
549 	struct workqueue_struct *endio_meta_workers;
550 	struct workqueue_struct *rmw_workers;
551 	struct workqueue_struct *compressed_write_workers;
552 	struct btrfs_workqueue *endio_write_workers;
553 	struct btrfs_workqueue *endio_freespace_worker;
554 	struct btrfs_workqueue *caching_workers;
555 
556 	/*
557 	 * Fixup workers take dirty pages that didn't properly go through the
558 	 * cow mechanism and make them safe to write.  It happens for the
559 	 * sys_munmap function call path.
560 	 */
561 	struct btrfs_workqueue *fixup_workers;
562 	struct btrfs_workqueue *delayed_workers;
563 
564 	struct task_struct *transaction_kthread;
565 	struct task_struct *cleaner_kthread;
566 	u32 thread_pool_size;
567 
568 	struct kobject *space_info_kobj;
569 	struct kobject *qgroups_kobj;
570 	struct kobject *discard_kobj;
571 
572 	/* Used to keep from writing metadata until there is a nice batch */
573 	struct percpu_counter dirty_metadata_bytes;
574 	struct percpu_counter delalloc_bytes;
575 	struct percpu_counter ordered_bytes;
576 	s32 dirty_metadata_batch;
577 	s32 delalloc_batch;
578 
579 	/* Protected by 'trans_lock'. */
580 	struct list_head dirty_cowonly_roots;
581 
582 	struct btrfs_fs_devices *fs_devices;
583 
584 	/*
585 	 * The space_info list is effectively read only after initial setup.
586 	 * It is populated at mount time and cleaned up after all block groups
587 	 * are removed.  RCU is used to protect it.
588 	 */
589 	struct list_head space_info;
590 
591 	struct btrfs_space_info *data_sinfo;
592 
593 	struct reloc_control *reloc_ctl;
594 
595 	/* data_alloc_cluster is only used in ssd_spread mode */
596 	struct btrfs_free_cluster data_alloc_cluster;
597 
598 	/* All metadata allocations go through this cluster. */
599 	struct btrfs_free_cluster meta_alloc_cluster;
600 
601 	/* Auto defrag inodes go here. */
602 	spinlock_t defrag_inodes_lock;
603 	struct rb_root defrag_inodes;
604 	atomic_t defrag_running;
605 
606 	/* Used to protect avail_{data, metadata, system}_alloc_bits */
607 	seqlock_t profiles_lock;
608 	/*
609 	 * These three are in extended format (availability of single chunks is
610 	 * denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other types are denoted
611 	 * by corresponding BTRFS_BLOCK_GROUP_* bits)
612 	 */
613 	u64 avail_data_alloc_bits;
614 	u64 avail_metadata_alloc_bits;
615 	u64 avail_system_alloc_bits;
616 
617 	/* Balance state */
618 	spinlock_t balance_lock;
619 	struct mutex balance_mutex;
620 	atomic_t balance_pause_req;
621 	atomic_t balance_cancel_req;
622 	struct btrfs_balance_control *balance_ctl;
623 	wait_queue_head_t balance_wait_q;
624 
625 	/* Cancellation requests for chunk relocation */
626 	atomic_t reloc_cancel_req;
627 
628 	u32 data_chunk_allocations;
629 	u32 metadata_ratio;
630 
631 	void *bdev_holder;
632 
633 	/* Private scrub information */
634 	struct mutex scrub_lock;
635 	atomic_t scrubs_running;
636 	atomic_t scrub_pause_req;
637 	atomic_t scrubs_paused;
638 	atomic_t scrub_cancel_req;
639 	wait_queue_head_t scrub_pause_wait;
640 	/*
641 	 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
642 	 * running.
643 	 */
644 	refcount_t scrub_workers_refcnt;
645 	struct workqueue_struct *scrub_workers;
646 	struct btrfs_subpage_info *subpage_info;
647 
648 	struct btrfs_discard_ctl discard_ctl;
649 
650 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
651 	u32 check_integrity_print_mask;
652 #endif
653 	/* Is qgroup tracking in a consistent state? */
654 	u64 qgroup_flags;
655 
656 	/* Holds configuration and tracking. Protected by qgroup_lock. */
657 	struct rb_root qgroup_tree;
658 	spinlock_t qgroup_lock;
659 
660 	/*
661 	 * Used to avoid frequently calling ulist_alloc()/ulist_free()
662 	 * when doing qgroup accounting, it must be protected by qgroup_lock.
663 	 */
664 	struct ulist *qgroup_ulist;
665 
666 	/*
667 	 * Protect user change for quota operations. If a transaction is needed,
668 	 * it must be started before locking this lock.
669 	 */
670 	struct mutex qgroup_ioctl_lock;
671 
672 	/* List of dirty qgroups to be written at next commit. */
673 	struct list_head dirty_qgroups;
674 
675 	/* Used by qgroup for an efficient tree traversal. */
676 	u64 qgroup_seq;
677 
678 	/* Qgroup rescan items. */
679 	/* Protects the progress item */
680 	struct mutex qgroup_rescan_lock;
681 	struct btrfs_key qgroup_rescan_progress;
682 	struct btrfs_workqueue *qgroup_rescan_workers;
683 	struct completion qgroup_rescan_completion;
684 	struct btrfs_work qgroup_rescan_work;
685 	/* Protected by qgroup_rescan_lock */
686 	bool qgroup_rescan_running;
687 	u8 qgroup_drop_subtree_thres;
688 
689 	/* Filesystem state */
690 	unsigned long fs_state;
691 
692 	struct btrfs_delayed_root *delayed_root;
693 
694 	/* Extent buffer radix tree */
695 	spinlock_t buffer_lock;
696 	/* Entries are eb->start / sectorsize */
697 	struct radix_tree_root buffer_radix;
698 
699 	/* Next backup root to be overwritten */
700 	int backup_root_index;
701 
702 	/* Device replace state */
703 	struct btrfs_dev_replace dev_replace;
704 
705 	struct semaphore uuid_tree_rescan_sem;
706 
707 	/* Used to reclaim the metadata space in the background. */
708 	struct work_struct async_reclaim_work;
709 	struct work_struct async_data_reclaim_work;
710 	struct work_struct preempt_reclaim_work;
711 
712 	/* Reclaim partially filled block groups in the background */
713 	struct work_struct reclaim_bgs_work;
714 	struct list_head reclaim_bgs;
715 	int bg_reclaim_threshold;
716 
717 	spinlock_t unused_bgs_lock;
718 	struct list_head unused_bgs;
719 	struct mutex unused_bg_unpin_mutex;
720 	/* Protect block groups that are going to be deleted */
721 	struct mutex reclaim_bgs_lock;
722 
723 	/* Cached block sizes */
724 	u32 nodesize;
725 	u32 sectorsize;
726 	/* ilog2 of sectorsize, use to avoid 64bit division */
727 	u32 sectorsize_bits;
728 	u32 csum_size;
729 	u32 csums_per_leaf;
730 	u32 stripesize;
731 
732 	/*
733 	 * Maximum size of an extent. BTRFS_MAX_EXTENT_SIZE on regular
734 	 * filesystem, on zoned it depends on the device constraints.
735 	 */
736 	u64 max_extent_size;
737 
738 	/* Block groups and devices containing active swapfiles. */
739 	spinlock_t swapfile_pins_lock;
740 	struct rb_root swapfile_pins;
741 
742 	struct crypto_shash *csum_shash;
743 
744 	/* Type of exclusive operation running, protected by super_lock */
745 	enum btrfs_exclusive_operation exclusive_operation;
746 
747 	/*
748 	 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
749 	 * if the mode is enabled
750 	 */
751 	u64 zone_size;
752 
753 	/* Constraints for ZONE_APPEND commands: */
754 	struct queue_limits limits;
755 	u64 max_zone_append_size;
756 
757 	struct mutex zoned_meta_io_lock;
758 	spinlock_t treelog_bg_lock;
759 	u64 treelog_bg;
760 
761 	/*
762 	 * Start of the dedicated data relocation block group, protected by
763 	 * relocation_bg_lock.
764 	 */
765 	spinlock_t relocation_bg_lock;
766 	u64 data_reloc_bg;
767 	struct mutex zoned_data_reloc_io_lock;
768 
769 	u64 nr_global_roots;
770 
771 	spinlock_t zone_active_bgs_lock;
772 	struct list_head zone_active_bgs;
773 
774 	/* Updates are not protected by any lock */
775 	struct btrfs_commit_stats commit_stats;
776 
777 	/*
778 	 * Last generation where we dropped a non-relocation root.
779 	 * Use btrfs_set_last_root_drop_gen() and btrfs_get_last_root_drop_gen()
780 	 * to change it and to read it, respectively.
781 	 */
782 	u64 last_root_drop_gen;
783 
784 	/*
785 	 * Annotations for transaction events (structures are empty when
786 	 * compiled without lockdep).
787 	 */
788 	struct lockdep_map btrfs_trans_num_writers_map;
789 	struct lockdep_map btrfs_trans_num_extwriters_map;
790 	struct lockdep_map btrfs_state_change_map[4];
791 	struct lockdep_map btrfs_trans_pending_ordered_map;
792 	struct lockdep_map btrfs_ordered_extent_map;
793 
794 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
795 	spinlock_t ref_verify_lock;
796 	struct rb_root block_tree;
797 #endif
798 
799 #ifdef CONFIG_BTRFS_DEBUG
800 	struct kobject *debug_kobj;
801 	struct list_head allocated_roots;
802 
803 	spinlock_t eb_leak_lock;
804 	struct list_head allocated_ebs;
805 #endif
806 };
807 
808 static inline void btrfs_set_last_root_drop_gen(struct btrfs_fs_info *fs_info,
809 						u64 gen)
810 {
811 	WRITE_ONCE(fs_info->last_root_drop_gen, gen);
812 }
813 
814 static inline u64 btrfs_get_last_root_drop_gen(const struct btrfs_fs_info *fs_info)
815 {
816 	return READ_ONCE(fs_info->last_root_drop_gen);
817 }
818 
819 /*
820  * Take the number of bytes to be checksummed and figure out how many leaves
821  * it would require to store the csums for that many bytes.
822  */
823 static inline u64 btrfs_csum_bytes_to_leaves(
824 			const struct btrfs_fs_info *fs_info, u64 csum_bytes)
825 {
826 	const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
827 
828 	return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
829 }
830 
831 /*
832  * Use this if we would be adding new items, as we could split nodes as we cow
833  * down the tree.
834  */
835 static inline u64 btrfs_calc_insert_metadata_size(const struct btrfs_fs_info *fs_info,
836 						  unsigned num_items)
837 {
838 	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
839 }
840 
841 /*
842  * Doing a truncate or a modification won't result in new nodes or leaves, just
843  * what we need for COW.
844  */
845 static inline u64 btrfs_calc_metadata_size(const struct btrfs_fs_info *fs_info,
846 						 unsigned num_items)
847 {
848 	return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
849 }
850 
851 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
852 					sizeof(struct btrfs_item))
853 
854 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
855 {
856 	return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && fs_info->zone_size > 0;
857 }
858 
859 /*
860  * Count how many fs_info->max_extent_size cover the @size
861  */
862 static inline u32 count_max_extents(struct btrfs_fs_info *fs_info, u64 size)
863 {
864 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
865 	if (!fs_info)
866 		return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
867 #endif
868 
869 	return div_u64(size + fs_info->max_extent_size - 1, fs_info->max_extent_size);
870 }
871 
872 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
873 			enum btrfs_exclusive_operation type);
874 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
875 				 enum btrfs_exclusive_operation type);
876 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
877 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
878 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
879 			  enum btrfs_exclusive_operation op);
880 
881 /* Compatibility and incompatibility defines */
882 void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
883 			     const char *name);
884 void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
885 			       const char *name);
886 void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
887 			      const char *name);
888 void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
889 				const char *name);
890 
891 #define __btrfs_fs_incompat(fs_info, flags)				\
892 	(!!(btrfs_super_incompat_flags((fs_info)->super_copy) & (flags)))
893 
894 #define __btrfs_fs_compat_ro(fs_info, flags)				\
895 	(!!(btrfs_super_compat_ro_flags((fs_info)->super_copy) & (flags)))
896 
897 #define btrfs_set_fs_incompat(__fs_info, opt)				\
898 	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt)
899 
900 #define btrfs_clear_fs_incompat(__fs_info, opt)				\
901 	__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt)
902 
903 #define btrfs_fs_incompat(fs_info, opt)					\
904 	__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
905 
906 #define btrfs_set_fs_compat_ro(__fs_info, opt)				\
907 	__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt)
908 
909 #define btrfs_clear_fs_compat_ro(__fs_info, opt)			\
910 	__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt)
911 
912 #define btrfs_fs_compat_ro(fs_info, opt)				\
913 	__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
914 
915 #define btrfs_clear_opt(o, opt)		((o) &= ~BTRFS_MOUNT_##opt)
916 #define btrfs_set_opt(o, opt)		((o) |= BTRFS_MOUNT_##opt)
917 #define btrfs_raw_test_opt(o, opt)	((o) & BTRFS_MOUNT_##opt)
918 #define btrfs_test_opt(fs_info, opt)	((fs_info)->mount_opt & \
919 					 BTRFS_MOUNT_##opt)
920 
921 #define btrfs_set_and_info(fs_info, opt, fmt, args...)			\
922 do {									\
923 	if (!btrfs_test_opt(fs_info, opt))				\
924 		btrfs_info(fs_info, fmt, ##args);			\
925 	btrfs_set_opt(fs_info->mount_opt, opt);				\
926 } while (0)
927 
928 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)		\
929 do {									\
930 	if (btrfs_test_opt(fs_info, opt))				\
931 		btrfs_info(fs_info, fmt, ##args);			\
932 	btrfs_clear_opt(fs_info->mount_opt, opt);			\
933 } while (0)
934 
935 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
936 {
937 	/* Do it this way so we only ever do one test_bit in the normal case. */
938 	if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
939 		if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
940 			return 2;
941 		return 1;
942 	}
943 	return 0;
944 }
945 
946 /*
947  * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
948  * anything except sleeping. This function is used to check the status of
949  * the fs.
950  * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
951  * since setting and checking for SB_RDONLY in the superblock's flags is not
952  * atomic.
953  */
954 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
955 {
956 	return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
957 		btrfs_fs_closing(fs_info);
958 }
959 
960 static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
961 {
962 	clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags);
963 }
964 
965 #define BTRFS_FS_ERROR(fs_info)	(unlikely(test_bit(BTRFS_FS_STATE_ERROR, \
966 						   &(fs_info)->fs_state)))
967 #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info)				\
968 	(unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR,		\
969 			   &(fs_info)->fs_state)))
970 
971 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
972 
973 #define EXPORT_FOR_TESTS
974 
975 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
976 {
977 	return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
978 }
979 
980 void btrfs_test_destroy_inode(struct inode *inode);
981 
982 #else
983 
984 #define EXPORT_FOR_TESTS static
985 
986 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
987 {
988 	return 0;
989 }
990 #endif
991 
992 #endif
993