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