/* SPDX-License-Identifier: GPL-2.0 */ #ifndef BTRFS_SPACE_INFO_H #define BTRFS_SPACE_INFO_H #include #include "volumes.h" /* * Different levels for to flush space when doing space reservations. * * The higher the level, the more methods we try to reclaim space. */ enum btrfs_reserve_flush_enum { /* If we are in the transaction, we can't flush anything.*/ BTRFS_RESERVE_NO_FLUSH, /* * Flush space by: * - Running delayed inode items * - Allocating a new chunk */ BTRFS_RESERVE_FLUSH_LIMIT, /* * Flush space by: * - Running delayed inode items * - Running delayed refs * - Running delalloc and waiting for ordered extents * - Allocating a new chunk * - Committing transaction */ BTRFS_RESERVE_FLUSH_EVICT, /* * Flush space by above mentioned methods and by: * - Running delayed iputs * - Committing transaction * * Can be interrupted by a fatal signal. */ BTRFS_RESERVE_FLUSH_DATA, BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, BTRFS_RESERVE_FLUSH_ALL, /* * Pretty much the same as FLUSH_ALL, but can also steal space from * global rsv. * * Can be interrupted by a fatal signal. */ BTRFS_RESERVE_FLUSH_ALL_STEAL, /* * This is for btrfs_use_block_rsv only. We have exhausted our block * rsv and our global block rsv. This can happen for things like * delalloc where we are overwriting a lot of extents with a single * extent and didn't reserve enough space. Alternatively it can happen * with delalloc where we reserve 1 extents worth for a large extent but * fragmentation leads to multiple extents being created. This will * give us the reservation in the case of * * if (num_bytes < (space_info->total_bytes - * btrfs_space_info_used(space_info, false)) * * Which ignores bytes_may_use. This is potentially dangerous, but our * reservation system is generally pessimistic so is able to absorb this * style of mistake. */ BTRFS_RESERVE_FLUSH_EMERGENCY, }; enum btrfs_flush_state { FLUSH_DELAYED_ITEMS_NR = 1, FLUSH_DELAYED_ITEMS = 2, FLUSH_DELAYED_REFS_NR = 3, FLUSH_DELAYED_REFS = 4, FLUSH_DELALLOC = 5, FLUSH_DELALLOC_WAIT = 6, FLUSH_DELALLOC_FULL = 7, ALLOC_CHUNK = 8, ALLOC_CHUNK_FORCE = 9, RUN_DELAYED_IPUTS = 10, COMMIT_TRANS = 11, }; struct btrfs_space_info { spinlock_t lock; u64 total_bytes; /* total bytes in the space, this doesn't take mirrors into account */ u64 bytes_used; /* total bytes used, this doesn't take mirrors into account */ u64 bytes_pinned; /* total bytes pinned, will be freed when the transaction finishes */ u64 bytes_reserved; /* total bytes the allocator has reserved for current allocations */ u64 bytes_may_use; /* number of bytes that may be used for delalloc/allocations */ u64 bytes_readonly; /* total bytes that are read only */ u64 bytes_zone_unusable; /* total bytes that are unusable until resetting the device zone */ u64 max_extent_size; /* This will hold the maximum extent size of the space info if we had an ENOSPC in the allocator. */ /* Chunk size in bytes */ u64 chunk_size; /* * Once a block group drops below this threshold (percents) we'll * schedule it for reclaim. */ int bg_reclaim_threshold; int clamp; /* Used to scale our threshold for preemptive flushing. The value is >> clamp, so turns out to be a 2^clamp divisor. */ unsigned int full:1; /* indicates that we cannot allocate any more chunks for this space */ unsigned int chunk_alloc:1; /* set if we are allocating a chunk */ unsigned int flush:1; /* set if we are trying to make space */ unsigned int force_alloc; /* set if we need to force a chunk alloc for this space */ u64 disk_used; /* total bytes used on disk */ u64 disk_total; /* total bytes on disk, takes mirrors into account */ u64 flags; struct list_head list; /* Protected by the spinlock 'lock'. */ struct list_head ro_bgs; struct list_head priority_tickets; struct list_head tickets; /* * Size of space that needs to be reclaimed in order to satisfy pending * tickets */ u64 reclaim_size; /* * tickets_id just indicates the next ticket will be handled, so note * it's not stored per ticket. */ u64 tickets_id; struct rw_semaphore groups_sem; /* for block groups in our same type */ struct list_head block_groups[BTRFS_NR_RAID_TYPES]; struct kobject kobj; struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES]; }; struct reserve_ticket { u64 bytes; int error; bool steal; struct list_head list; wait_queue_head_t wait; }; static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) { return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); } /* * * Declare a helper function to detect underflow of various space info members */ #define DECLARE_SPACE_INFO_UPDATE(name, trace_name) \ static inline void \ btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \ struct btrfs_space_info *sinfo, \ s64 bytes) \ { \ const u64 abs_bytes = (bytes < 0) ? -bytes : bytes; \ lockdep_assert_held(&sinfo->lock); \ trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \ trace_btrfs_space_reservation(fs_info, trace_name, \ sinfo->flags, abs_bytes, \ bytes > 0); \ if (bytes < 0 && sinfo->name < -bytes) { \ WARN_ON(1); \ sinfo->name = 0; \ return; \ } \ sinfo->name += bytes; \ } DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info"); DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned"); int btrfs_init_space_info(struct btrfs_fs_info *fs_info); void btrfs_add_bg_to_space_info(struct btrfs_fs_info *info, struct btrfs_block_group *block_group); void btrfs_update_space_info_chunk_size(struct btrfs_space_info *space_info, u64 chunk_size); struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info, u64 flags); u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info, bool may_use_included); void btrfs_clear_space_info_full(struct btrfs_fs_info *info); void btrfs_dump_space_info(struct btrfs_fs_info *fs_info, struct btrfs_space_info *info, u64 bytes, int dump_block_groups); int btrfs_reserve_metadata_bytes(struct btrfs_fs_info *fs_info, struct btrfs_space_info *space_info, u64 orig_bytes, enum btrfs_reserve_flush_enum flush); void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info, struct btrfs_space_info *space_info); int btrfs_can_overcommit(struct btrfs_fs_info *fs_info, struct btrfs_space_info *space_info, u64 bytes, enum btrfs_reserve_flush_enum flush); static inline void btrfs_space_info_free_bytes_may_use( struct btrfs_fs_info *fs_info, struct btrfs_space_info *space_info, u64 num_bytes) { spin_lock(&space_info->lock); btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes); btrfs_try_granting_tickets(fs_info, space_info); spin_unlock(&space_info->lock); } int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes, enum btrfs_reserve_flush_enum flush); void btrfs_dump_space_info_for_trans_abort(struct btrfs_fs_info *fs_info); void btrfs_init_async_reclaim_work(struct btrfs_fs_info *fs_info); u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); #endif /* BTRFS_SPACE_INFO_H */