| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #ifndef BTRFS_FS_H |
| #define BTRFS_FS_H |
| |
| #include <linux/blkdev.h> |
| #include <linux/fs.h> |
| #include <linux/btrfs_tree.h> |
| #include <linux/sizes.h> |
| #include "extent-io-tree.h" |
| #include "extent_map.h" |
| #include "async-thread.h" |
| #include "block-rsv.h" |
| |
| #define BTRFS_MAX_EXTENT_SIZE SZ_128M |
| |
| #define BTRFS_OLDEST_GENERATION 0ULL |
| |
| #define BTRFS_EMPTY_DIR_SIZE 0 |
| |
| #define BTRFS_DIRTY_METADATA_THRESH SZ_32M |
| |
| #define BTRFS_SUPER_INFO_OFFSET SZ_64K |
| #define BTRFS_SUPER_INFO_SIZE 4096 |
| static_assert(sizeof(struct btrfs_super_block) == BTRFS_SUPER_INFO_SIZE); |
| |
| /* |
| * Number of metadata items necessary for an unlink operation: |
| * |
| * 1 for the possible orphan item |
| * 1 for the dir item |
| * 1 for the dir index |
| * 1 for the inode ref |
| * 1 for the inode |
| * 1 for the parent inode |
| */ |
| #define BTRFS_UNLINK_METADATA_UNITS 6 |
| |
| /* |
| * The reserved space at the beginning of each device. It covers the primary |
| * super block and leaves space for potential use by other tools like |
| * bootloaders or to lower potential damage of accidental overwrite. |
| */ |
| #define BTRFS_DEVICE_RANGE_RESERVED (SZ_1M) |
| /* |
| * Runtime (in-memory) states of filesystem |
| */ |
| enum { |
| /* |
| * Filesystem is being remounted, allow to skip some operations, like |
| * defrag |
| */ |
| BTRFS_FS_STATE_REMOUNTING, |
| /* Filesystem in RO mode */ |
| BTRFS_FS_STATE_RO, |
| /* Track if a transaction abort has been reported on this filesystem */ |
| BTRFS_FS_STATE_TRANS_ABORTED, |
| /* |
| * Bio operations should be blocked on this filesystem because a source |
| * or target device is being destroyed as part of a device replace |
| */ |
| BTRFS_FS_STATE_DEV_REPLACING, |
| /* The btrfs_fs_info created for self-tests */ |
| BTRFS_FS_STATE_DUMMY_FS_INFO, |
| |
| BTRFS_FS_STATE_NO_CSUMS, |
| |
| /* Indicates there was an error cleaning up a log tree. */ |
| BTRFS_FS_STATE_LOG_CLEANUP_ERROR, |
| |
| BTRFS_FS_STATE_COUNT |
| }; |
| |
| enum { |
| BTRFS_FS_CLOSING_START, |
| BTRFS_FS_CLOSING_DONE, |
| BTRFS_FS_LOG_RECOVERING, |
| BTRFS_FS_OPEN, |
| BTRFS_FS_QUOTA_ENABLED, |
| BTRFS_FS_UPDATE_UUID_TREE_GEN, |
| BTRFS_FS_CREATING_FREE_SPACE_TREE, |
| BTRFS_FS_BTREE_ERR, |
| BTRFS_FS_LOG1_ERR, |
| BTRFS_FS_LOG2_ERR, |
| BTRFS_FS_QUOTA_OVERRIDE, |
| /* Used to record internally whether fs has been frozen */ |
| BTRFS_FS_FROZEN, |
| /* |
| * Indicate that balance has been set up from the ioctl and is in the |
| * main phase. The fs_info::balance_ctl is initialized. |
| */ |
| BTRFS_FS_BALANCE_RUNNING, |
| |
| /* |
| * Indicate that relocation of a chunk has started, it's set per chunk |
| * and is toggled between chunks. |
| */ |
| BTRFS_FS_RELOC_RUNNING, |
| |
| /* Indicate that the cleaner thread is awake and doing something. */ |
| BTRFS_FS_CLEANER_RUNNING, |
| |
| /* |
| * The checksumming has an optimized version and is considered fast, |
| * so we don't need to offload checksums to workqueues. |
| */ |
| BTRFS_FS_CSUM_IMPL_FAST, |
| |
| /* Indicate that the discard workqueue can service discards. */ |
| BTRFS_FS_DISCARD_RUNNING, |
| |
| /* Indicate that we need to cleanup space cache v1 */ |
| BTRFS_FS_CLEANUP_SPACE_CACHE_V1, |
| |
| /* Indicate that we can't trust the free space tree for caching yet */ |
| BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, |
| |
| /* Indicate whether there are any tree modification log users */ |
| BTRFS_FS_TREE_MOD_LOG_USERS, |
| |
| /* Indicate that we want the transaction kthread to commit right now. */ |
| BTRFS_FS_COMMIT_TRANS, |
| |
| /* Indicate we have half completed snapshot deletions pending. */ |
| BTRFS_FS_UNFINISHED_DROPS, |
| |
| /* Indicate we have to finish a zone to do next allocation. */ |
| BTRFS_FS_NEED_ZONE_FINISH, |
| |
| /* Indicate that we want to commit the transaction. */ |
| BTRFS_FS_NEED_TRANS_COMMIT, |
| |
| /* This is set when active zone tracking is needed. */ |
| BTRFS_FS_ACTIVE_ZONE_TRACKING, |
| |
| /* |
| * Indicate if we have some features changed, this is mostly for |
| * cleaner thread to update the sysfs interface. |
| */ |
| BTRFS_FS_FEATURE_CHANGED, |
| |
| /* |
| * Indicate that we have found a tree block which is only aligned to |
| * sectorsize, but not to nodesize. This should be rare nowadays. |
| */ |
| BTRFS_FS_UNALIGNED_TREE_BLOCK, |
| |
| #if BITS_PER_LONG == 32 |
| /* Indicate if we have error/warn message printed on 32bit systems */ |
| BTRFS_FS_32BIT_ERROR, |
| BTRFS_FS_32BIT_WARN, |
| #endif |
| }; |
| |
| /* |
| * Flags for mount options. |
| * |
| * Note: don't forget to add new options to btrfs_show_options() |
| */ |
| enum { |
| BTRFS_MOUNT_NODATASUM = (1UL << 0), |
| BTRFS_MOUNT_NODATACOW = (1UL << 1), |
| BTRFS_MOUNT_NOBARRIER = (1UL << 2), |
| BTRFS_MOUNT_SSD = (1UL << 3), |
| BTRFS_MOUNT_DEGRADED = (1UL << 4), |
| BTRFS_MOUNT_COMPRESS = (1UL << 5), |
| BTRFS_MOUNT_NOTREELOG = (1UL << 6), |
| BTRFS_MOUNT_FLUSHONCOMMIT = (1UL << 7), |
| BTRFS_MOUNT_SSD_SPREAD = (1UL << 8), |
| BTRFS_MOUNT_NOSSD = (1UL << 9), |
| BTRFS_MOUNT_DISCARD_SYNC = (1UL << 10), |
| BTRFS_MOUNT_FORCE_COMPRESS = (1UL << 11), |
| BTRFS_MOUNT_SPACE_CACHE = (1UL << 12), |
| BTRFS_MOUNT_CLEAR_CACHE = (1UL << 13), |
| BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED = (1UL << 14), |
| BTRFS_MOUNT_ENOSPC_DEBUG = (1UL << 15), |
| BTRFS_MOUNT_AUTO_DEFRAG = (1UL << 16), |
| BTRFS_MOUNT_USEBACKUPROOT = (1UL << 17), |
| BTRFS_MOUNT_SKIP_BALANCE = (1UL << 18), |
| BTRFS_MOUNT_PANIC_ON_FATAL_ERROR = (1UL << 19), |
| BTRFS_MOUNT_RESCAN_UUID_TREE = (1UL << 20), |
| BTRFS_MOUNT_FRAGMENT_DATA = (1UL << 21), |
| BTRFS_MOUNT_FRAGMENT_METADATA = (1UL << 22), |
| BTRFS_MOUNT_FREE_SPACE_TREE = (1UL << 23), |
| BTRFS_MOUNT_NOLOGREPLAY = (1UL << 24), |
| BTRFS_MOUNT_REF_VERIFY = (1UL << 25), |
| BTRFS_MOUNT_DISCARD_ASYNC = (1UL << 26), |
| BTRFS_MOUNT_IGNOREBADROOTS = (1UL << 27), |
| BTRFS_MOUNT_IGNOREDATACSUMS = (1UL << 28), |
| BTRFS_MOUNT_NODISCARD = (1UL << 29), |
| BTRFS_MOUNT_NOSPACECACHE = (1UL << 30), |
| }; |
| |
| /* |
| * Compat flags that we support. If any incompat flags are set other than the |
| * ones specified below then we will fail to mount |
| */ |
| #define BTRFS_FEATURE_COMPAT_SUPP 0ULL |
| #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL |
| #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL |
| |
| #define BTRFS_FEATURE_COMPAT_RO_SUPP \ |
| (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \ |
| BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID | \ |
| BTRFS_FEATURE_COMPAT_RO_VERITY | \ |
| BTRFS_FEATURE_COMPAT_RO_BLOCK_GROUP_TREE) |
| |
| #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL |
| #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL |
| |
| #define BTRFS_FEATURE_INCOMPAT_SUPP_STABLE \ |
| (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \ |
| BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \ |
| BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \ |
| BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \ |
| BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \ |
| BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \ |
| BTRFS_FEATURE_INCOMPAT_RAID56 | \ |
| BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \ |
| BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \ |
| BTRFS_FEATURE_INCOMPAT_NO_HOLES | \ |
| BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \ |
| BTRFS_FEATURE_INCOMPAT_RAID1C34 | \ |
| BTRFS_FEATURE_INCOMPAT_ZONED | \ |
| BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA) |
| |
| #ifdef CONFIG_BTRFS_DEBUG |
| /* |
| * Features under developmen like Extent tree v2 support is enabled |
| * only under CONFIG_BTRFS_DEBUG. |
| */ |
| #define BTRFS_FEATURE_INCOMPAT_SUPP \ |
| (BTRFS_FEATURE_INCOMPAT_SUPP_STABLE | \ |
| BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE | \ |
| BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2) |
| |
| #else |
| |
| #define BTRFS_FEATURE_INCOMPAT_SUPP \ |
| (BTRFS_FEATURE_INCOMPAT_SUPP_STABLE) |
| |
| #endif |
| |
| #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \ |
| (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF) |
| #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL |
| |
| #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) |
| #define BTRFS_DEFAULT_MAX_INLINE (2048) |
| |
| struct btrfs_dev_replace { |
| /* See #define above */ |
| u64 replace_state; |
| /* Seconds since 1-Jan-1970 */ |
| time64_t time_started; |
| /* Seconds since 1-Jan-1970 */ |
| time64_t time_stopped; |
| atomic64_t num_write_errors; |
| atomic64_t num_uncorrectable_read_errors; |
| |
| u64 cursor_left; |
| u64 committed_cursor_left; |
| u64 cursor_left_last_write_of_item; |
| u64 cursor_right; |
| |
| /* See #define above */ |
| u64 cont_reading_from_srcdev_mode; |
| |
| int is_valid; |
| int item_needs_writeback; |
| struct btrfs_device *srcdev; |
| struct btrfs_device *tgtdev; |
| |
| struct mutex lock_finishing_cancel_unmount; |
| struct rw_semaphore rwsem; |
| |
| struct btrfs_scrub_progress scrub_progress; |
| |
| struct percpu_counter bio_counter; |
| wait_queue_head_t replace_wait; |
| }; |
| |
| /* |
| * Free clusters are used to claim free space in relatively large chunks, |
| * allowing us to do less seeky writes. They are used for all metadata |
| * allocations. In ssd_spread mode they are also used for data allocations. |
| */ |
| struct btrfs_free_cluster { |
| spinlock_t lock; |
| spinlock_t refill_lock; |
| struct rb_root root; |
| |
| /* Largest extent in this cluster */ |
| u64 max_size; |
| |
| /* First extent starting offset */ |
| u64 window_start; |
| |
| /* We did a full search and couldn't create a cluster */ |
| bool fragmented; |
| |
| struct btrfs_block_group *block_group; |
| /* |
| * When a cluster is allocated from a block group, we put the cluster |
| * onto a list in the block group so that it can be freed before the |
| * block group is freed. |
| */ |
| struct list_head block_group_list; |
| }; |
| |
| /* Discard control. */ |
| /* |
| * Async discard uses multiple lists to differentiate the discard filter |
| * parameters. Index 0 is for completely free block groups where we need to |
| * ensure the entire block group is trimmed without being lossy. Indices |
| * afterwards represent monotonically decreasing discard filter sizes to |
| * prioritize what should be discarded next. |
| */ |
| #define BTRFS_NR_DISCARD_LISTS 3 |
| #define BTRFS_DISCARD_INDEX_UNUSED 0 |
| #define BTRFS_DISCARD_INDEX_START 1 |
| |
| struct btrfs_discard_ctl { |
| struct workqueue_struct *discard_workers; |
| struct delayed_work work; |
| spinlock_t lock; |
| struct btrfs_block_group *block_group; |
| struct list_head discard_list[BTRFS_NR_DISCARD_LISTS]; |
| u64 prev_discard; |
| u64 prev_discard_time; |
| atomic_t discardable_extents; |
| atomic64_t discardable_bytes; |
| u64 max_discard_size; |
| u64 delay_ms; |
| u32 iops_limit; |
| u32 kbps_limit; |
| u64 discard_extent_bytes; |
| u64 discard_bitmap_bytes; |
| atomic64_t discard_bytes_saved; |
| }; |
| |
| /* |
| * Exclusive operations (device replace, resize, device add/remove, balance) |
| */ |
| enum btrfs_exclusive_operation { |
| BTRFS_EXCLOP_NONE, |
| BTRFS_EXCLOP_BALANCE_PAUSED, |
| BTRFS_EXCLOP_BALANCE, |
| BTRFS_EXCLOP_DEV_ADD, |
| BTRFS_EXCLOP_DEV_REMOVE, |
| BTRFS_EXCLOP_DEV_REPLACE, |
| BTRFS_EXCLOP_RESIZE, |
| BTRFS_EXCLOP_SWAP_ACTIVATE, |
| }; |
| |
| /* Store data about transaction commits, exported via sysfs. */ |
| struct btrfs_commit_stats { |
| /* Total number of commits */ |
| u64 commit_count; |
| /* The maximum commit duration so far in ns */ |
| u64 max_commit_dur; |
| /* The last commit duration in ns */ |
| u64 last_commit_dur; |
| /* The total commit duration in ns */ |
| u64 total_commit_dur; |
| }; |
| |
| struct btrfs_fs_info { |
| u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; |
| unsigned long flags; |
| struct btrfs_root *tree_root; |
| struct btrfs_root *chunk_root; |
| struct btrfs_root *dev_root; |
| struct btrfs_root *fs_root; |
| struct btrfs_root *quota_root; |
| struct btrfs_root *uuid_root; |
| struct btrfs_root *data_reloc_root; |
| struct btrfs_root *block_group_root; |
| struct btrfs_root *stripe_root; |
| |
| /* The log root tree is a directory of all the other log roots */ |
| struct btrfs_root *log_root_tree; |
| |
| /* The tree that holds the global roots (csum, extent, etc) */ |
| rwlock_t global_root_lock; |
| struct rb_root global_root_tree; |
| |
| spinlock_t fs_roots_radix_lock; |
| struct radix_tree_root fs_roots_radix; |
| |
| /* Block group cache stuff */ |
| rwlock_t block_group_cache_lock; |
| struct rb_root_cached block_group_cache_tree; |
| |
| /* Keep track of unallocated space */ |
| atomic64_t free_chunk_space; |
| |
| /* Track ranges which are used by log trees blocks/logged data extents */ |
| struct extent_io_tree excluded_extents; |
| |
| /* logical->physical extent mapping */ |
| struct rb_root_cached mapping_tree; |
| rwlock_t mapping_tree_lock; |
| |
| /* |
| * Block reservation for extent, checksum, root tree and delayed dir |
| * index item. |
| */ |
| struct btrfs_block_rsv global_block_rsv; |
| /* Block reservation for metadata operations */ |
| struct btrfs_block_rsv trans_block_rsv; |
| /* Block reservation for chunk tree */ |
| struct btrfs_block_rsv chunk_block_rsv; |
| /* Block reservation for delayed operations */ |
| struct btrfs_block_rsv delayed_block_rsv; |
| /* Block reservation for delayed refs */ |
| struct btrfs_block_rsv delayed_refs_rsv; |
| |
| struct btrfs_block_rsv empty_block_rsv; |
| |
| /* |
| * Updated while holding the lock 'trans_lock'. Due to the life cycle of |
| * a transaction, it can be directly read while holding a transaction |
| * handle, everywhere else must be read with btrfs_get_fs_generation(). |
| * Should always be updated using btrfs_set_fs_generation(). |
| */ |
| u64 generation; |
| /* |
| * Always use btrfs_get_last_trans_committed() and |
| * btrfs_set_last_trans_committed() to read and update this field. |
| */ |
| u64 last_trans_committed; |
| /* |
| * Generation of the last transaction used for block group relocation |
| * since the filesystem was last mounted (or 0 if none happened yet). |
| * Must be written and read while holding btrfs_fs_info::commit_root_sem. |
| */ |
| u64 last_reloc_trans; |
| |
| /* |
| * This is updated to the current trans every time a full commit is |
| * required instead of the faster short fsync log commits |
| */ |
| u64 last_trans_log_full_commit; |
| unsigned long mount_opt; |
| |
| unsigned long compress_type:4; |
| unsigned int compress_level; |
| u32 commit_interval; |
| /* |
| * It is a suggestive number, the read side is safe even it gets a |
| * wrong number because we will write out the data into a regular |
| * extent. The write side(mount/remount) is under ->s_umount lock, |
| * so it is also safe. |
| */ |
| u64 max_inline; |
| |
| struct btrfs_transaction *running_transaction; |
| wait_queue_head_t transaction_throttle; |
| wait_queue_head_t transaction_wait; |
| wait_queue_head_t transaction_blocked_wait; |
| wait_queue_head_t async_submit_wait; |
| |
| /* |
| * Used to protect the incompat_flags, compat_flags, compat_ro_flags |
| * when they are updated. |
| * |
| * Because we do not clear the flags for ever, so we needn't use |
| * the lock on the read side. |
| * |
| * We also needn't use the lock when we mount the fs, because |
| * there is no other task which will update the flag. |
| */ |
| spinlock_t super_lock; |
| struct btrfs_super_block *super_copy; |
| struct btrfs_super_block *super_for_commit; |
| struct super_block *sb; |
| struct inode *btree_inode; |
| struct mutex tree_log_mutex; |
| struct mutex transaction_kthread_mutex; |
| struct mutex cleaner_mutex; |
| struct mutex chunk_mutex; |
| |
| /* |
| * This is taken to make sure we don't set block groups ro after the |
| * free space cache has been allocated on them. |
| */ |
| struct mutex ro_block_group_mutex; |
| |
| /* |
| * This is used during read/modify/write to make sure no two ios are |
| * trying to mod the same stripe at the same time. |
| */ |
| struct btrfs_stripe_hash_table *stripe_hash_table; |
| |
| /* |
| * This protects the ordered operations list only while we are |
| * processing all of the entries on it. This way we make sure the |
| * commit code doesn't find the list temporarily empty because another |
| * function happens to be doing non-waiting preflush before jumping |
| * into the main commit. |
| */ |
| struct mutex ordered_operations_mutex; |
| |
| struct rw_semaphore commit_root_sem; |
| |
| struct rw_semaphore cleanup_work_sem; |
| |
| struct rw_semaphore subvol_sem; |
| |
| spinlock_t trans_lock; |
| /* |
| * The reloc mutex goes with the trans lock, it is taken during commit |
| * to protect us from the relocation code. |
| */ |
| struct mutex reloc_mutex; |
| |
| struct list_head trans_list; |
| struct list_head dead_roots; |
| struct list_head caching_block_groups; |
| |
| spinlock_t delayed_iput_lock; |
| struct list_head delayed_iputs; |
| atomic_t nr_delayed_iputs; |
| wait_queue_head_t delayed_iputs_wait; |
| |
| atomic64_t tree_mod_seq; |
| |
| /* This protects tree_mod_log and tree_mod_seq_list */ |
| rwlock_t tree_mod_log_lock; |
| struct rb_root tree_mod_log; |
| struct list_head tree_mod_seq_list; |
| |
| atomic_t async_delalloc_pages; |
| |
| /* This is used to protect the following list -- ordered_roots. */ |
| spinlock_t ordered_root_lock; |
| |
| /* |
| * All fs/file tree roots in which there are data=ordered extents |
| * pending writeback are added into this list. |
| * |
| * These can span multiple transactions and basically include every |
| * dirty data page that isn't from nodatacow. |
| */ |
| struct list_head ordered_roots; |
| |
| struct mutex delalloc_root_mutex; |
| spinlock_t delalloc_root_lock; |
| /* All fs/file tree roots that have delalloc inodes. */ |
| struct list_head delalloc_roots; |
| |
| /* |
| * There is a pool of worker threads for checksumming during writes and |
| * a pool for checksumming after reads. This is because readers can |
| * run with FS locks held, and the writers may be waiting for those |
| * locks. We don't want ordering in the pending list to cause |
| * deadlocks, and so the two are serviced separately. |
| * |
| * A third pool does submit_bio to avoid deadlocking with the other two. |
| */ |
| struct btrfs_workqueue *workers; |
| struct btrfs_workqueue *delalloc_workers; |
| struct btrfs_workqueue *flush_workers; |
| struct workqueue_struct *endio_workers; |
| struct workqueue_struct *endio_meta_workers; |
| struct workqueue_struct *rmw_workers; |
| struct workqueue_struct *compressed_write_workers; |
| struct btrfs_workqueue *endio_write_workers; |
| struct btrfs_workqueue *endio_freespace_worker; |
| struct btrfs_workqueue *caching_workers; |
| |
| /* |
| * Fixup workers take dirty pages that didn't properly go through the |
| * cow mechanism and make them safe to write. It happens for the |
| * sys_munmap function call path. |
| */ |
| struct btrfs_workqueue *fixup_workers; |
| struct btrfs_workqueue *delayed_workers; |
| |
| struct task_struct *transaction_kthread; |
| struct task_struct *cleaner_kthread; |
| u32 thread_pool_size; |
| |
| struct kobject *space_info_kobj; |
| struct kobject *qgroups_kobj; |
| struct kobject *discard_kobj; |
| |
| /* Used to keep from writing metadata until there is a nice batch */ |
| struct percpu_counter dirty_metadata_bytes; |
| struct percpu_counter delalloc_bytes; |
| struct percpu_counter ordered_bytes; |
| s32 dirty_metadata_batch; |
| s32 delalloc_batch; |
| |
| /* Protected by 'trans_lock'. */ |
| struct list_head dirty_cowonly_roots; |
| |
| struct btrfs_fs_devices *fs_devices; |
| |
| /* |
| * The space_info list is effectively read only after initial setup. |
| * It is populated at mount time and cleaned up after all block groups |
| * are removed. RCU is used to protect it. |
| */ |
| struct list_head space_info; |
| |
| struct btrfs_space_info *data_sinfo; |
| |
| struct reloc_control *reloc_ctl; |
| |
| /* data_alloc_cluster is only used in ssd_spread mode */ |
| struct btrfs_free_cluster data_alloc_cluster; |
| |
| /* All metadata allocations go through this cluster. */ |
| struct btrfs_free_cluster meta_alloc_cluster; |
| |
| /* Auto defrag inodes go here. */ |
| spinlock_t defrag_inodes_lock; |
| struct rb_root defrag_inodes; |
| atomic_t defrag_running; |
| |
| /* Used to protect avail_{data, metadata, system}_alloc_bits */ |
| seqlock_t profiles_lock; |
| /* |
| * These three are in extended format (availability of single chunks is |
| * denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other types are denoted |
| * by corresponding BTRFS_BLOCK_GROUP_* bits) |
| */ |
| u64 avail_data_alloc_bits; |
| u64 avail_metadata_alloc_bits; |
| u64 avail_system_alloc_bits; |
| |
| /* Balance state */ |
| spinlock_t balance_lock; |
| struct mutex balance_mutex; |
| atomic_t balance_pause_req; |
| atomic_t balance_cancel_req; |
| struct btrfs_balance_control *balance_ctl; |
| wait_queue_head_t balance_wait_q; |
| |
| /* Cancellation requests for chunk relocation */ |
| atomic_t reloc_cancel_req; |
| |
| u32 data_chunk_allocations; |
| u32 metadata_ratio; |
| |
| void *bdev_holder; |
| |
| /* Private scrub information */ |
| struct mutex scrub_lock; |
| atomic_t scrubs_running; |
| atomic_t scrub_pause_req; |
| atomic_t scrubs_paused; |
| atomic_t scrub_cancel_req; |
| wait_queue_head_t scrub_pause_wait; |
| /* |
| * The worker pointers are NULL iff the refcount is 0, ie. scrub is not |
| * running. |
| */ |
| refcount_t scrub_workers_refcnt; |
| struct workqueue_struct *scrub_workers; |
| struct btrfs_subpage_info *subpage_info; |
| |
| struct btrfs_discard_ctl discard_ctl; |
| |
| /* Is qgroup tracking in a consistent state? */ |
| u64 qgroup_flags; |
| |
| /* Holds configuration and tracking. Protected by qgroup_lock. */ |
| struct rb_root qgroup_tree; |
| spinlock_t qgroup_lock; |
| |
| /* |
| * Used to avoid frequently calling ulist_alloc()/ulist_free() |
| * when doing qgroup accounting, it must be protected by qgroup_lock. |
| */ |
| struct ulist *qgroup_ulist; |
| |
| /* |
| * Protect user change for quota operations. If a transaction is needed, |
| * it must be started before locking this lock. |
| */ |
| struct mutex qgroup_ioctl_lock; |
| |
| /* List of dirty qgroups to be written at next commit. */ |
| struct list_head dirty_qgroups; |
| |
| /* Used by qgroup for an efficient tree traversal. */ |
| u64 qgroup_seq; |
| |
| /* Qgroup rescan items. */ |
| /* Protects the progress item */ |
| struct mutex qgroup_rescan_lock; |
| struct btrfs_key qgroup_rescan_progress; |
| struct btrfs_workqueue *qgroup_rescan_workers; |
| struct completion qgroup_rescan_completion; |
| struct btrfs_work qgroup_rescan_work; |
| /* Protected by qgroup_rescan_lock */ |
| bool qgroup_rescan_running; |
| u8 qgroup_drop_subtree_thres; |
| u64 qgroup_enable_gen; |
| |
| /* |
| * If this is not 0, then it indicates a serious filesystem error has |
| * happened and it contains that error (negative errno value). |
| */ |
| int fs_error; |
| |
| /* Filesystem state */ |
| unsigned long fs_state; |
| |
| struct btrfs_delayed_root *delayed_root; |
| |
| /* Extent buffer radix tree */ |
| spinlock_t buffer_lock; |
| /* Entries are eb->start / sectorsize */ |
| struct radix_tree_root buffer_radix; |
| |
| /* Next backup root to be overwritten */ |
| int backup_root_index; |
| |
| /* Device replace state */ |
| struct btrfs_dev_replace dev_replace; |
| |
| struct semaphore uuid_tree_rescan_sem; |
| |
| /* Used to reclaim the metadata space in the background. */ |
| struct work_struct async_reclaim_work; |
| struct work_struct async_data_reclaim_work; |
| struct work_struct preempt_reclaim_work; |
| |
| /* Reclaim partially filled block groups in the background */ |
| struct work_struct reclaim_bgs_work; |
| struct list_head reclaim_bgs; |
| int bg_reclaim_threshold; |
| |
| spinlock_t unused_bgs_lock; |
| struct list_head unused_bgs; |
| struct mutex unused_bg_unpin_mutex; |
| /* Protect block groups that are going to be deleted */ |
| struct mutex reclaim_bgs_lock; |
| |
| /* Cached block sizes */ |
| u32 nodesize; |
| u32 sectorsize; |
| /* ilog2 of sectorsize, use to avoid 64bit division */ |
| u32 sectorsize_bits; |
| u32 csum_size; |
| u32 csums_per_leaf; |
| u32 stripesize; |
| |
| /* |
| * Maximum size of an extent. BTRFS_MAX_EXTENT_SIZE on regular |
| * filesystem, on zoned it depends on the device constraints. |
| */ |
| u64 max_extent_size; |
| |
| /* Block groups and devices containing active swapfiles. */ |
| spinlock_t swapfile_pins_lock; |
| struct rb_root swapfile_pins; |
| |
| struct crypto_shash *csum_shash; |
| |
| /* Type of exclusive operation running, protected by super_lock */ |
| enum btrfs_exclusive_operation exclusive_operation; |
| |
| /* |
| * Zone size > 0 when in ZONED mode, otherwise it's used for a check |
| * if the mode is enabled |
| */ |
| u64 zone_size; |
| |
| /* Constraints for ZONE_APPEND commands: */ |
| struct queue_limits limits; |
| u64 max_zone_append_size; |
| |
| struct mutex zoned_meta_io_lock; |
| spinlock_t treelog_bg_lock; |
| u64 treelog_bg; |
| |
| /* |
| * Start of the dedicated data relocation block group, protected by |
| * relocation_bg_lock. |
| */ |
| spinlock_t relocation_bg_lock; |
| u64 data_reloc_bg; |
| struct mutex zoned_data_reloc_io_lock; |
| |
| struct btrfs_block_group *active_meta_bg; |
| struct btrfs_block_group *active_system_bg; |
| |
| u64 nr_global_roots; |
| |
| spinlock_t zone_active_bgs_lock; |
| struct list_head zone_active_bgs; |
| |
| /* Updates are not protected by any lock */ |
| struct btrfs_commit_stats commit_stats; |
| |
| /* |
| * Last generation where we dropped a non-relocation root. |
| * Use btrfs_set_last_root_drop_gen() and btrfs_get_last_root_drop_gen() |
| * to change it and to read it, respectively. |
| */ |
| u64 last_root_drop_gen; |
| |
| /* |
| * Annotations for transaction events (structures are empty when |
| * compiled without lockdep). |
| */ |
| struct lockdep_map btrfs_trans_num_writers_map; |
| struct lockdep_map btrfs_trans_num_extwriters_map; |
| struct lockdep_map btrfs_state_change_map[4]; |
| struct lockdep_map btrfs_trans_pending_ordered_map; |
| struct lockdep_map btrfs_ordered_extent_map; |
| |
| #ifdef CONFIG_BTRFS_FS_REF_VERIFY |
| spinlock_t ref_verify_lock; |
| struct rb_root block_tree; |
| #endif |
| |
| #ifdef CONFIG_BTRFS_DEBUG |
| struct kobject *debug_kobj; |
| struct list_head allocated_roots; |
| |
| spinlock_t eb_leak_lock; |
| struct list_head allocated_ebs; |
| #endif |
| }; |
| |
| static inline u64 btrfs_get_fs_generation(const struct btrfs_fs_info *fs_info) |
| { |
| return READ_ONCE(fs_info->generation); |
| } |
| |
| static inline void btrfs_set_fs_generation(struct btrfs_fs_info *fs_info, u64 gen) |
| { |
| WRITE_ONCE(fs_info->generation, gen); |
| } |
| |
| static inline u64 btrfs_get_last_trans_committed(const struct btrfs_fs_info *fs_info) |
| { |
| return READ_ONCE(fs_info->last_trans_committed); |
| } |
| |
| static inline void btrfs_set_last_trans_committed(struct btrfs_fs_info *fs_info, u64 gen) |
| { |
| WRITE_ONCE(fs_info->last_trans_committed, gen); |
| } |
| |
| static inline void btrfs_set_last_root_drop_gen(struct btrfs_fs_info *fs_info, |
| u64 gen) |
| { |
| WRITE_ONCE(fs_info->last_root_drop_gen, gen); |
| } |
| |
| static inline u64 btrfs_get_last_root_drop_gen(const struct btrfs_fs_info *fs_info) |
| { |
| return READ_ONCE(fs_info->last_root_drop_gen); |
| } |
| |
| /* |
| * Take the number of bytes to be checksummed and figure out how many leaves |
| * it would require to store the csums for that many bytes. |
| */ |
| static inline u64 btrfs_csum_bytes_to_leaves( |
| const struct btrfs_fs_info *fs_info, u64 csum_bytes) |
| { |
| const u64 num_csums = csum_bytes >> fs_info->sectorsize_bits; |
| |
| return DIV_ROUND_UP_ULL(num_csums, fs_info->csums_per_leaf); |
| } |
| |
| /* |
| * Use this if we would be adding new items, as we could split nodes as we cow |
| * down the tree. |
| */ |
| static inline u64 btrfs_calc_insert_metadata_size(const struct btrfs_fs_info *fs_info, |
| unsigned num_items) |
| { |
| return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items; |
| } |
| |
| /* |
| * Doing a truncate or a modification won't result in new nodes or leaves, just |
| * what we need for COW. |
| */ |
| static inline u64 btrfs_calc_metadata_size(const struct btrfs_fs_info *fs_info, |
| unsigned num_items) |
| { |
| return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items; |
| } |
| |
| #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \ |
| sizeof(struct btrfs_item)) |
| |
| static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info) |
| { |
| return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && fs_info->zone_size > 0; |
| } |
| |
| /* |
| * Count how many fs_info->max_extent_size cover the @size |
| */ |
| static inline u32 count_max_extents(struct btrfs_fs_info *fs_info, u64 size) |
| { |
| #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
| if (!fs_info) |
| return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE); |
| #endif |
| |
| return div_u64(size + fs_info->max_extent_size - 1, fs_info->max_extent_size); |
| } |
| |
| bool btrfs_exclop_start(struct btrfs_fs_info *fs_info, |
| enum btrfs_exclusive_operation type); |
| bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info, |
| enum btrfs_exclusive_operation type); |
| void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info); |
| void btrfs_exclop_finish(struct btrfs_fs_info *fs_info); |
| void btrfs_exclop_balance(struct btrfs_fs_info *fs_info, |
| enum btrfs_exclusive_operation op); |
| |
| /* Compatibility and incompatibility defines */ |
| void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag, |
| const char *name); |
| void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag, |
| const char *name); |
| void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag, |
| const char *name); |
| void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag, |
| const char *name); |
| |
| #define __btrfs_fs_incompat(fs_info, flags) \ |
| (!!(btrfs_super_incompat_flags((fs_info)->super_copy) & (flags))) |
| |
| #define __btrfs_fs_compat_ro(fs_info, flags) \ |
| (!!(btrfs_super_compat_ro_flags((fs_info)->super_copy) & (flags))) |
| |
| #define btrfs_set_fs_incompat(__fs_info, opt) \ |
| __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt) |
| |
| #define btrfs_clear_fs_incompat(__fs_info, opt) \ |
| __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt) |
| |
| #define btrfs_fs_incompat(fs_info, opt) \ |
| __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt) |
| |
| #define btrfs_set_fs_compat_ro(__fs_info, opt) \ |
| __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt) |
| |
| #define btrfs_clear_fs_compat_ro(__fs_info, opt) \ |
| __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt) |
| |
| #define btrfs_fs_compat_ro(fs_info, opt) \ |
| __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) |
| |
| #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) |
| #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) |
| #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt) |
| #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \ |
| BTRFS_MOUNT_##opt) |
| |
| static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info) |
| { |
| /* Do it this way so we only ever do one test_bit in the normal case. */ |
| if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) { |
| if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags)) |
| return 2; |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * If we remount the fs to be R/O or umount the fs, the cleaner needn't do |
| * anything except sleeping. This function is used to check the status of |
| * the fs. |
| * We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount, |
| * since setting and checking for SB_RDONLY in the superblock's flags is not |
| * atomic. |
| */ |
| static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info) |
| { |
| return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) || |
| btrfs_fs_closing(fs_info); |
| } |
| |
| static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info) |
| { |
| clear_and_wake_up_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags); |
| } |
| |
| #define BTRFS_FS_ERROR(fs_info) (READ_ONCE((fs_info)->fs_error)) |
| |
| #define BTRFS_FS_LOG_CLEANUP_ERROR(fs_info) \ |
| (unlikely(test_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, \ |
| &(fs_info)->fs_state))) |
| |
| #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
| |
| #define EXPORT_FOR_TESTS |
| |
| static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info) |
| { |
| return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state); |
| } |
| |
| void btrfs_test_destroy_inode(struct inode *inode); |
| |
| #else |
| |
| #define EXPORT_FOR_TESTS static |
| |
| static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info) |
| { |
| return 0; |
| } |
| #endif |
| |
| #endif |