1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/blkdev.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"
15 #define BTRFS_MAX_EXTENT_SIZE SZ_128M
17 #define BTRFS_OLDEST_GENERATION 0ULL
19 #define BTRFS_EMPTY_DIR_SIZE 0
21 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M
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);
28 * Number of metadata items necessary for an unlink operation:
30 * 1 for the possible orphan item
35 * 1 for the parent inode
37 #define BTRFS_UNLINK_METADATA_UNITS 6
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.
44 #define BTRFS_DEVICE_RANGE_RESERVED (SZ_1M)
46 * Runtime (in-memory) states of filesystem
50 * Filesystem is being remounted, allow to skip some operations, like
53 BTRFS_FS_STATE_REMOUNTING,
54 /* Filesystem in RO mode */
56 /* Track if a transaction abort has been reported on this filesystem */
57 BTRFS_FS_STATE_TRANS_ABORTED,
59 * Bio operations should be blocked on this filesystem because a source
60 * or target device is being destroyed as part of a device replace
62 BTRFS_FS_STATE_DEV_REPLACING,
63 /* The btrfs_fs_info created for self-tests */
64 BTRFS_FS_STATE_DUMMY_FS_INFO,
66 BTRFS_FS_STATE_NO_CSUMS,
68 /* Indicates there was an error cleaning up a log tree. */
69 BTRFS_FS_STATE_LOG_CLEANUP_ERROR,
75 BTRFS_FS_CLOSING_START,
76 BTRFS_FS_CLOSING_DONE,
77 BTRFS_FS_LOG_RECOVERING,
79 BTRFS_FS_QUOTA_ENABLED,
80 BTRFS_FS_UPDATE_UUID_TREE_GEN,
81 BTRFS_FS_CREATING_FREE_SPACE_TREE,
85 BTRFS_FS_QUOTA_OVERRIDE,
86 /* Used to record internally whether fs has been frozen */
89 * Indicate that balance has been set up from the ioctl and is in the
90 * main phase. The fs_info::balance_ctl is initialized.
92 BTRFS_FS_BALANCE_RUNNING,
95 * Indicate that relocation of a chunk has started, it's set per chunk
96 * and is toggled between chunks.
98 BTRFS_FS_RELOC_RUNNING,
100 /* Indicate that the cleaner thread is awake and doing something. */
101 BTRFS_FS_CLEANER_RUNNING,
104 * The checksumming has an optimized version and is considered fast,
105 * so we don't need to offload checksums to workqueues.
107 BTRFS_FS_CSUM_IMPL_FAST,
109 /* Indicate that the discard workqueue can service discards. */
110 BTRFS_FS_DISCARD_RUNNING,
112 /* Indicate that we need to cleanup space cache v1 */
113 BTRFS_FS_CLEANUP_SPACE_CACHE_V1,
115 /* Indicate that we can't trust the free space tree for caching yet */
116 BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
118 /* Indicate whether there are any tree modification log users */
119 BTRFS_FS_TREE_MOD_LOG_USERS,
121 /* Indicate that we want the transaction kthread to commit right now. */
122 BTRFS_FS_COMMIT_TRANS,
124 /* Indicate we have half completed snapshot deletions pending. */
125 BTRFS_FS_UNFINISHED_DROPS,
127 /* Indicate we have to finish a zone to do next allocation. */
128 BTRFS_FS_NEED_ZONE_FINISH,
130 /* Indicate that we want to commit the transaction. */
131 BTRFS_FS_NEED_TRANS_COMMIT,
133 /* This is set when active zone tracking is needed. */
134 BTRFS_FS_ACTIVE_ZONE_TRACKING,
137 * Indicate if we have some features changed, this is mostly for
138 * cleaner thread to update the sysfs interface.
140 BTRFS_FS_FEATURE_CHANGED,
143 * Indicate that we have found a tree block which is only aligned to
144 * sectorsize, but not to nodesize. This should be rare nowadays.
146 BTRFS_FS_UNALIGNED_TREE_BLOCK,
148 #if BITS_PER_LONG == 32
149 /* Indicate if we have error/warn message printed on 32bit systems */
150 BTRFS_FS_32BIT_ERROR,
156 * Flags for mount options.
158 * Note: don't forget to add new options to btrfs_show_options()
161 BTRFS_MOUNT_NODATASUM = (1UL << 0),
162 BTRFS_MOUNT_NODATACOW = (1UL << 1),
163 BTRFS_MOUNT_NOBARRIER = (1UL << 2),
164 BTRFS_MOUNT_SSD = (1UL << 3),
165 BTRFS_MOUNT_DEGRADED = (1UL << 4),
166 BTRFS_MOUNT_COMPRESS = (1UL << 5),
167 BTRFS_MOUNT_NOTREELOG = (1UL << 6),
168 BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7),
169 BTRFS_MOUNT_SSD_SPREAD = (1UL << 8),
170 BTRFS_MOUNT_NOSSD = (1UL << 9),
171 BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10),
172 BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11),
173 BTRFS_MOUNT_SPACE_CACHE = (1UL << 12),
174 BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13),
175 BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14),
176 BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15),
177 BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16),
178 BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17),
179 BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18),
180 BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 19),
181 BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 20),
182 BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 21),
183 BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 22),
184 BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 23),
185 BTRFS_MOUNT_NOLOGREPLAY = (1UL << 24),
186 BTRFS_MOUNT_REF_VERIFY = (1UL << 25),
187 BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 26),
188 BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 27),
189 BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 28),
190 BTRFS_MOUNT_NODISCARD = (1UL << 29),
194 * Compat flags that we support. If any incompat flags are set other than the
195 * ones specified below then we will fail to mount
197 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
198 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
199 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
201 #define BTRFS_FEATURE_COMPAT_RO_SUPP \
202 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
203 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \
204 BTRFS_FEATURE_COMPAT_RO_VERITY | \
205 BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE)
207 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
208 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
210 #define BTRFS_FEATURE_INCOMPAT_SUPP_STABLE \
211 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
212 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
213 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
214 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
215 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
216 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
217 BTRFS_FEATURE_INCOMPAT_RAID56 | \
218 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
219 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
220 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
221 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
222 BTRFS_FEATURE_INCOMPAT_RAID1C34 | \
223 BTRFS_FEATURE_INCOMPAT_ZONED | \
224 BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA)
226 #ifdef CONFIG_BTRFS_DEBUG
228 * Features under developmen like Extent tree v2 support is enabled
229 * only under CONFIG_BTRFS_DEBUG.
231 #define BTRFS_FEATURE_INCOMPAT_SUPP \
232 (BTRFS_FEATURE_INCOMPAT_SUPP_STABLE | \
233 BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE | \
234 BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2)
238 #define BTRFS_FEATURE_INCOMPAT_SUPP \
239 (BTRFS_FEATURE_INCOMPAT_SUPP_STABLE)
243 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
244 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
245 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
247 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
248 #define BTRFS_DEFAULT_MAX_INLINE (2048)
250 struct btrfs_dev_replace {
251 /* See #define above */
253 /* Seconds since 1-Jan-1970 */
254 time64_t time_started;
255 /* Seconds since 1-Jan-1970 */
256 time64_t time_stopped;
257 atomic64_t num_write_errors;
258 atomic64_t num_uncorrectable_read_errors;
261 u64 committed_cursor_left;
262 u64 cursor_left_last_write_of_item;
265 /* See #define above */
266 u64 cont_reading_from_srcdev_mode;
269 int item_needs_writeback;
270 struct btrfs_device *srcdev;
271 struct btrfs_device *tgtdev;
273 struct mutex lock_finishing_cancel_unmount;
274 struct rw_semaphore rwsem;
276 struct btrfs_scrub_progress scrub_progress;
278 struct percpu_counter bio_counter;
279 wait_queue_head_t replace_wait;
283 * Free clusters are used to claim free space in relatively large chunks,
284 * allowing us to do less seeky writes. They are used for all metadata
285 * allocations. In ssd_spread mode they are also used for data allocations.
287 struct btrfs_free_cluster {
289 spinlock_t refill_lock;
292 /* Largest extent in this cluster */
295 /* First extent starting offset */
298 /* We did a full search and couldn't create a cluster */
301 struct btrfs_block_group *block_group;
303 * When a cluster is allocated from a block group, we put the cluster
304 * onto a list in the block group so that it can be freed before the
305 * block group is freed.
307 struct list_head block_group_list;
310 /* Discard control. */
312 * Async discard uses multiple lists to differentiate the discard filter
313 * parameters. Index 0 is for completely free block groups where we need to
314 * ensure the entire block group is trimmed without being lossy. Indices
315 * afterwards represent monotonically decreasing discard filter sizes to
316 * prioritize what should be discarded next.
318 #define BTRFS_NR_DISCARD_LISTS 3
319 #define BTRFS_DISCARD_INDEX_UNUSED 0
320 #define BTRFS_DISCARD_INDEX_START 1
322 struct btrfs_discard_ctl {
323 struct workqueue_struct *discard_workers;
324 struct delayed_work work;
326 struct btrfs_block_group *block_group;
327 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS];
329 u64 prev_discard_time;
330 atomic_t discardable_extents;
331 atomic64_t discardable_bytes;
332 u64 max_discard_size;
336 u64 discard_extent_bytes;
337 u64 discard_bitmap_bytes;
338 atomic64_t discard_bytes_saved;
342 * Exclusive operations (device replace, resize, device add/remove, balance)
344 enum btrfs_exclusive_operation {
346 BTRFS_EXCLOP_BALANCE_PAUSED,
347 BTRFS_EXCLOP_BALANCE,
348 BTRFS_EXCLOP_DEV_ADD,
349 BTRFS_EXCLOP_DEV_REMOVE,
350 BTRFS_EXCLOP_DEV_REPLACE,
352 BTRFS_EXCLOP_SWAP_ACTIVATE,
355 /* Store data about transaction commits, exported via sysfs. */
356 struct btrfs_commit_stats {
357 /* Total number of commits */
359 /* The maximum commit duration so far in ns */
361 /* The last commit duration in ns */
363 /* The total commit duration in ns */
364 u64 total_commit_dur;
367 struct btrfs_fs_info {
368 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
370 struct btrfs_root *tree_root;
371 struct btrfs_root *chunk_root;
372 struct btrfs_root *dev_root;
373 struct btrfs_root *fs_root;
374 struct btrfs_root *quota_root;
375 struct btrfs_root *uuid_root;
376 struct btrfs_root *data_reloc_root;
377 struct btrfs_root *block_group_root;
378 struct btrfs_root *stripe_root;
380 /* The log root tree is a directory of all the other log roots */
381 struct btrfs_root *log_root_tree;
383 /* The tree that holds the global roots (csum, extent, etc) */
384 rwlock_t global_root_lock;
385 struct rb_root global_root_tree;
387 spinlock_t fs_roots_radix_lock;
388 struct radix_tree_root fs_roots_radix;
390 /* Block group cache stuff */
391 rwlock_t block_group_cache_lock;
392 struct rb_root_cached block_group_cache_tree;
394 /* Keep track of unallocated space */
395 atomic64_t free_chunk_space;
397 /* Track ranges which are used by log trees blocks/logged data extents */
398 struct extent_io_tree excluded_extents;
400 /* logical->physical extent mapping */
401 struct extent_map_tree mapping_tree;
404 * Block reservation for extent, checksum, root tree and delayed dir
407 struct btrfs_block_rsv global_block_rsv;
408 /* Block reservation for metadata operations */
409 struct btrfs_block_rsv trans_block_rsv;
410 /* Block reservation for chunk tree */
411 struct btrfs_block_rsv chunk_block_rsv;
412 /* Block reservation for delayed operations */
413 struct btrfs_block_rsv delayed_block_rsv;
414 /* Block reservation for delayed refs */
415 struct btrfs_block_rsv delayed_refs_rsv;
417 struct btrfs_block_rsv empty_block_rsv;
420 u64 last_trans_committed;
422 * Generation of the last transaction used for block group relocation
423 * since the filesystem was last mounted (or 0 if none happened yet).
424 * Must be written and read while holding btrfs_fs_info::commit_root_sem.
426 u64 last_reloc_trans;
429 * This is updated to the current trans every time a full commit is
430 * required instead of the faster short fsync log commits
432 u64 last_trans_log_full_commit;
433 unsigned long mount_opt;
435 unsigned long compress_type:4;
436 unsigned int compress_level;
439 * It is a suggestive number, the read side is safe even it gets a
440 * wrong number because we will write out the data into a regular
441 * extent. The write side(mount/remount) is under ->s_umount lock,
442 * so it is also safe.
446 struct btrfs_transaction *running_transaction;
447 wait_queue_head_t transaction_throttle;
448 wait_queue_head_t transaction_wait;
449 wait_queue_head_t transaction_blocked_wait;
450 wait_queue_head_t async_submit_wait;
453 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
454 * when they are updated.
456 * Because we do not clear the flags for ever, so we needn't use
457 * the lock on the read side.
459 * We also needn't use the lock when we mount the fs, because
460 * there is no other task which will update the flag.
462 spinlock_t super_lock;
463 struct btrfs_super_block *super_copy;
464 struct btrfs_super_block *super_for_commit;
465 struct super_block *sb;
466 struct inode *btree_inode;
467 struct mutex tree_log_mutex;
468 struct mutex transaction_kthread_mutex;
469 struct mutex cleaner_mutex;
470 struct mutex chunk_mutex;
473 * This is taken to make sure we don't set block groups ro after the
474 * free space cache has been allocated on them.
476 struct mutex ro_block_group_mutex;
479 * This is used during read/modify/write to make sure no two ios are
480 * trying to mod the same stripe at the same time.
482 struct btrfs_stripe_hash_table *stripe_hash_table;
485 * This protects the ordered operations list only while we are
486 * processing all of the entries on it. This way we make sure the
487 * commit code doesn't find the list temporarily empty because another
488 * function happens to be doing non-waiting preflush before jumping
489 * into the main commit.
491 struct mutex ordered_operations_mutex;
493 struct rw_semaphore commit_root_sem;
495 struct rw_semaphore cleanup_work_sem;
497 struct rw_semaphore subvol_sem;
499 spinlock_t trans_lock;
501 * The reloc mutex goes with the trans lock, it is taken during commit
502 * to protect us from the relocation code.
504 struct mutex reloc_mutex;
506 struct list_head trans_list;
507 struct list_head dead_roots;
508 struct list_head caching_block_groups;
510 spinlock_t delayed_iput_lock;
511 struct list_head delayed_iputs;
512 atomic_t nr_delayed_iputs;
513 wait_queue_head_t delayed_iputs_wait;
515 atomic64_t tree_mod_seq;
517 /* This protects tree_mod_log and tree_mod_seq_list */
518 rwlock_t tree_mod_log_lock;
519 struct rb_root tree_mod_log;
520 struct list_head tree_mod_seq_list;
522 atomic_t async_delalloc_pages;
524 /* This is used to protect the following list -- ordered_roots. */
525 spinlock_t ordered_root_lock;
528 * All fs/file tree roots in which there are data=ordered extents
529 * pending writeback are added into this list.
531 * These can span multiple transactions and basically include every
532 * dirty data page that isn't from nodatacow.
534 struct list_head ordered_roots;
536 struct mutex delalloc_root_mutex;
537 spinlock_t delalloc_root_lock;
538 /* All fs/file tree roots that have delalloc inodes. */
539 struct list_head delalloc_roots;
542 * There is a pool of worker threads for checksumming during writes and
543 * a pool for checksumming after reads. This is because readers can
544 * run with FS locks held, and the writers may be waiting for those
545 * locks. We don't want ordering in the pending list to cause
546 * deadlocks, and so the two are serviced separately.
548 * A third pool does submit_bio to avoid deadlocking with the other two.
550 struct btrfs_workqueue *workers;
551 struct btrfs_workqueue *delalloc_workers;
552 struct btrfs_workqueue *flush_workers;
553 struct workqueue_struct *endio_workers;
554 struct workqueue_struct *endio_meta_workers;
555 struct workqueue_struct *rmw_workers;
556 struct workqueue_struct *compressed_write_workers;
557 struct btrfs_workqueue *endio_write_workers;
558 struct btrfs_workqueue *endio_freespace_worker;
559 struct btrfs_workqueue *caching_workers;
562 * Fixup workers take dirty pages that didn't properly go through the
563 * cow mechanism and make them safe to write. It happens for the
564 * sys_munmap function call path.
566 struct btrfs_workqueue *fixup_workers;
567 struct btrfs_workqueue *delayed_workers;
569 struct task_struct *transaction_kthread;
570 struct task_struct *cleaner_kthread;
571 u32 thread_pool_size;
573 struct kobject *space_info_kobj;
574 struct kobject *qgroups_kobj;
575 struct kobject *discard_kobj;
577 /* Used to keep from writing metadata until there is a nice batch */
578 struct percpu_counter dirty_metadata_bytes;
579 struct percpu_counter delalloc_bytes;
580 struct percpu_counter ordered_bytes;
581 s32 dirty_metadata_batch;
584 /* Protected by 'trans_lock'. */
585 struct list_head dirty_cowonly_roots;
587 struct btrfs_fs_devices *fs_devices;
590 * The space_info list is effectively read only after initial setup.
591 * It is populated at mount time and cleaned up after all block groups
592 * are removed. RCU is used to protect it.
594 struct list_head space_info;
596 struct btrfs_space_info *data_sinfo;
598 struct reloc_control *reloc_ctl;
600 /* data_alloc_cluster is only used in ssd_spread mode */
601 struct btrfs_free_cluster data_alloc_cluster;
603 /* All metadata allocations go through this cluster. */
604 struct btrfs_free_cluster meta_alloc_cluster;
606 /* Auto defrag inodes go here. */
607 spinlock_t defrag_inodes_lock;
608 struct rb_root defrag_inodes;
609 atomic_t defrag_running;
611 /* Used to protect avail_{data, metadata, system}_alloc_bits */
612 seqlock_t profiles_lock;
614 * These three are in extended format (availability of single chunks is
615 * denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other types are denoted
616 * by corresponding BTRFS_BLOCK_GROUP_* bits)
618 u64 avail_data_alloc_bits;
619 u64 avail_metadata_alloc_bits;
620 u64 avail_system_alloc_bits;
623 spinlock_t balance_lock;
624 struct mutex balance_mutex;
625 atomic_t balance_pause_req;
626 atomic_t balance_cancel_req;
627 struct btrfs_balance_control *balance_ctl;
628 wait_queue_head_t balance_wait_q;
630 /* Cancellation requests for chunk relocation */
631 atomic_t reloc_cancel_req;
633 u32 data_chunk_allocations;
638 /* Private scrub information */
639 struct mutex scrub_lock;
640 atomic_t scrubs_running;
641 atomic_t scrub_pause_req;
642 atomic_t scrubs_paused;
643 atomic_t scrub_cancel_req;
644 wait_queue_head_t scrub_pause_wait;
646 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not
649 refcount_t scrub_workers_refcnt;
650 struct workqueue_struct *scrub_workers;
651 struct btrfs_subpage_info *subpage_info;
653 struct btrfs_discard_ctl discard_ctl;
655 /* Is qgroup tracking in a consistent state? */
658 /* Holds configuration and tracking. Protected by qgroup_lock. */
659 struct rb_root qgroup_tree;
660 spinlock_t qgroup_lock;
663 * Used to avoid frequently calling ulist_alloc()/ulist_free()
664 * when doing qgroup accounting, it must be protected by qgroup_lock.
666 struct ulist *qgroup_ulist;
669 * Protect user change for quota operations. If a transaction is needed,
670 * it must be started before locking this lock.
672 struct mutex qgroup_ioctl_lock;
674 /* List of dirty qgroups to be written at next commit. */
675 struct list_head dirty_qgroups;
677 /* Used by qgroup for an efficient tree traversal. */
680 /* Qgroup rescan items. */
681 /* Protects the progress item */
682 struct mutex qgroup_rescan_lock;
683 struct btrfs_key qgroup_rescan_progress;
684 struct btrfs_workqueue *qgroup_rescan_workers;
685 struct completion qgroup_rescan_completion;
686 struct btrfs_work qgroup_rescan_work;
687 /* Protected by qgroup_rescan_lock */
688 bool qgroup_rescan_running;
689 u8 qgroup_drop_subtree_thres;
690 u64 qgroup_enable_gen;
693 * If this is not 0, then it indicates a serious filesystem error has
694 * happened and it contains that error (negative errno value).
698 /* Filesystem state */
699 unsigned long fs_state;
701 struct btrfs_delayed_root *delayed_root;
703 /* Extent buffer radix tree */
704 spinlock_t buffer_lock;
705 /* Entries are eb->start / sectorsize */
706 struct radix_tree_root buffer_radix;
708 /* Next backup root to be overwritten */
709 int backup_root_index;
711 /* Device replace state */
712 struct btrfs_dev_replace dev_replace;
714 struct semaphore uuid_tree_rescan_sem;
716 /* Used to reclaim the metadata space in the background. */
717 struct work_struct async_reclaim_work;
718 struct work_struct async_data_reclaim_work;
719 struct work_struct preempt_reclaim_work;
721 /* Reclaim partially filled block groups in the background */
722 struct work_struct reclaim_bgs_work;
723 struct list_head reclaim_bgs;
724 int bg_reclaim_threshold;
726 spinlock_t unused_bgs_lock;
727 struct list_head unused_bgs;
728 struct mutex unused_bg_unpin_mutex;
729 /* Protect block groups that are going to be deleted */
730 struct mutex reclaim_bgs_lock;
732 /* Cached block sizes */
735 /* ilog2 of sectorsize, use to avoid 64bit division */
742 * Maximum size of an extent. BTRFS_MAX_EXTENT_SIZE on regular
743 * filesystem, on zoned it depends on the device constraints.
747 /* Block groups and devices containing active swapfiles. */
748 spinlock_t swapfile_pins_lock;
749 struct rb_root swapfile_pins;
751 struct crypto_shash *csum_shash;
753 /* Type of exclusive operation running, protected by super_lock */
754 enum btrfs_exclusive_operation exclusive_operation;
757 * Zone size > 0 when in ZONED mode, otherwise it's used for a check
758 * if the mode is enabled
762 /* Constraints for ZONE_APPEND commands: */
763 struct queue_limits limits;
764 u64 max_zone_append_size;
766 struct mutex zoned_meta_io_lock;
767 spinlock_t treelog_bg_lock;
771 * Start of the dedicated data relocation block group, protected by
772 * relocation_bg_lock.
774 spinlock_t relocation_bg_lock;
776 struct mutex zoned_data_reloc_io_lock;
778 struct btrfs_block_group *active_meta_bg;
779 struct btrfs_block_group *active_system_bg;
783 spinlock_t zone_active_bgs_lock;
784 struct list_head zone_active_bgs;
786 /* Updates are not protected by any lock */
787 struct btrfs_commit_stats commit_stats;
790 * Last generation where we dropped a non-relocation root.
791 * Use btrfs_set_last_root_drop_gen() and btrfs_get_last_root_drop_gen()
792 * to change it and to read it, respectively.
794 u64 last_root_drop_gen;
797 * Annotations for transaction events (structures are empty when
798 * compiled without lockdep).
800 struct lockdep_map btrfs_trans_num_writers_map;
801 struct lockdep_map btrfs_trans_num_extwriters_map;
802 struct lockdep_map btrfs_state_change_map[4];
803 struct lockdep_map btrfs_trans_pending_ordered_map;
804 struct lockdep_map btrfs_ordered_extent_map;
806 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
807 spinlock_t ref_verify_lock;
808 struct rb_root block_tree;
811 #ifdef CONFIG_BTRFS_DEBUG
812 struct kobject *debug_kobj;
813 struct list_head allocated_roots;
815 spinlock_t eb_leak_lock;
816 struct list_head allocated_ebs;
820 static inline void btrfs_set_last_root_drop_gen(struct btrfs_fs_info *fs_info,
823 WRITE_ONCE(fs_info->last_root_drop_gen, gen);
826 static inline u64 btrfs_get_last_root_drop_gen(const struct btrfs_fs_info *fs_info)
828 return READ_ONCE(fs_info->last_root_drop_gen);
832 * Take the number of bytes to be checksummed and figure out how many leaves
833 * it would require to store the csums for that many bytes.
835 static inline u64 btrfs_csum_bytes_to_leaves(
836 const struct btrfs_fs_info *fs_info, u64 csum_bytes)
838 const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits;
840 return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf);
844 * Use this if we would be adding new items, as we could split nodes as we cow
847 static inline u64 btrfs_calc_insert_metadata_size(const struct btrfs_fs_info *fs_info,
850 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
854 * Doing a truncate or a modification won't result in new nodes or leaves, just
855 * what we need for COW.
857 static inline u64 btrfs_calc_metadata_size(const struct btrfs_fs_info *fs_info,
860 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
863 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
864 sizeof(struct btrfs_item))
866 static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
868 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && fs_info->zone_size > 0;
872 * Count how many fs_info->max_extent_size cover the @size
874 static inline u32 count_max_extents(struct btrfs_fs_info *fs_info, u64 size)
876 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
878 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
881 return div_u64(size + fs_info->max_extent_size - 1, fs_info->max_extent_size);
884 bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
885 enum btrfs_exclusive_operation type);
886 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
887 enum btrfs_exclusive_operation type);
888 void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info);
889 void btrfs_exclop_finish(struct btrfs_fs_info *fs_info);
890 void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
891 enum btrfs_exclusive_operation op);
893 /* Compatibility and incompatibility defines */
894 void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
896 void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
898 void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
900 void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
903 #define __btrfs_fs_incompat(fs_info, flags) \
904 (!!(btrfs_super_incompat_flags((fs_info)->super_copy) & (flags)))
906 #define __btrfs_fs_compat_ro(fs_info, flags) \
907 (!!(btrfs_super_compat_ro_flags((fs_info)->super_copy) & (flags)))
909 #define btrfs_set_fs_incompat(__fs_info, opt) \
910 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt)
912 #define btrfs_clear_fs_incompat(__fs_info, opt) \
913 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt)
915 #define btrfs_fs_incompat(fs_info, opt) \
916 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
918 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
919 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt)
921 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
922 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt)
924 #define btrfs_fs_compat_ro(fs_info, opt) \
925 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
927 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
928 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
929 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
930 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
933 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \
935 if (!btrfs_test_opt(fs_info, opt)) \
936 btrfs_info(fs_info, fmt, ##args); \
937 btrfs_set_opt(fs_info->mount_opt, opt); \
940 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
942 if (btrfs_test_opt(fs_info, opt)) \
943 btrfs_info(fs_info, fmt, ##args); \
944 btrfs_clear_opt(fs_info->mount_opt, opt); \
947 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
949 /* Do it this way so we only ever do one test_bit in the normal case. */
950 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
951 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
959 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
960 * anything except sleeping. This function is used to check the status of
962 * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
963 * since setting and checking for SB_RDONLY in the superblock's flags is not
966 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
968 return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
969 btrfs_fs_closing(fs_info);
972 static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
974 clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags);
977 #define BTRFS_FS_ERROR(fs_info) (READ_ONCE((fs_info)->fs_error))
979 #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \
980 (unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \
981 &(fs_info)->fs_state)))
983 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
985 #define EXPORT_FOR_TESTS
987 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
989 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
992 void btrfs_test_destroy_inode(struct inode *inode);
996 #define EXPORT_FOR_TESTS static
998 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)