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178 lines
5.8 KiB
178 lines
5.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef BTRFS_SPACE_INFO_H |
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#define BTRFS_SPACE_INFO_H |
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struct btrfs_space_info { |
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spinlock_t lock; |
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u64 total_bytes; /* total bytes in the space, |
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this doesn't take mirrors into account */ |
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u64 bytes_used; /* total bytes used, |
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this doesn't take mirrors into account */ |
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u64 bytes_pinned; /* total bytes pinned, will be freed when the |
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transaction finishes */ |
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u64 bytes_reserved; /* total bytes the allocator has reserved for |
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current allocations */ |
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u64 bytes_may_use; /* number of bytes that may be used for |
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delalloc/allocations */ |
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u64 bytes_readonly; /* total bytes that are read only */ |
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u64 bytes_zone_unusable; /* total bytes that are unusable until |
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resetting the device zone */ |
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u64 max_extent_size; /* This will hold the maximum extent size of |
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the space info if we had an ENOSPC in the |
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allocator. */ |
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int clamp; /* Used to scale our threshold for preemptive |
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flushing. The value is >> clamp, so turns |
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out to be a 2^clamp divisor. */ |
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unsigned int full:1; /* indicates that we cannot allocate any more |
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chunks for this space */ |
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unsigned int chunk_alloc:1; /* set if we are allocating a chunk */ |
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unsigned int flush:1; /* set if we are trying to make space */ |
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unsigned int force_alloc; /* set if we need to force a chunk |
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alloc for this space */ |
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u64 disk_used; /* total bytes used on disk */ |
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u64 disk_total; /* total bytes on disk, takes mirrors into |
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account */ |
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u64 flags; |
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/* |
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* bytes_pinned is kept in line with what is actually pinned, as in |
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* we've called update_block_group and dropped the bytes_used counter |
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* and increased the bytes_pinned counter. However this means that |
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* bytes_pinned does not reflect the bytes that will be pinned once the |
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* delayed refs are flushed, so this counter is inc'ed every time we |
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* call btrfs_free_extent so it is a realtime count of what will be |
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* freed once the transaction is committed. It will be zeroed every |
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* time the transaction commits. |
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*/ |
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struct percpu_counter total_bytes_pinned; |
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struct list_head list; |
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/* Protected by the spinlock 'lock'. */ |
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struct list_head ro_bgs; |
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struct list_head priority_tickets; |
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struct list_head tickets; |
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/* |
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* Size of space that needs to be reclaimed in order to satisfy pending |
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* tickets |
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*/ |
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u64 reclaim_size; |
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/* |
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* tickets_id just indicates the next ticket will be handled, so note |
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* it's not stored per ticket. |
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*/ |
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u64 tickets_id; |
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struct rw_semaphore groups_sem; |
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/* for block groups in our same type */ |
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struct list_head block_groups[BTRFS_NR_RAID_TYPES]; |
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struct kobject kobj; |
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struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES]; |
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}; |
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struct reserve_ticket { |
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u64 bytes; |
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int error; |
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bool steal; |
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struct list_head list; |
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wait_queue_head_t wait; |
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}; |
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static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) |
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{ |
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return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && |
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(space_info->flags & BTRFS_BLOCK_GROUP_DATA)); |
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} |
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/* |
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* |
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* Declare a helper function to detect underflow of various space info members |
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*/ |
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#define DECLARE_SPACE_INFO_UPDATE(name, trace_name) \ |
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static inline void \ |
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btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \ |
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struct btrfs_space_info *sinfo, \ |
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s64 bytes) \ |
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{ \ |
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const u64 abs_bytes = (bytes < 0) ? -bytes : bytes; \ |
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lockdep_assert_held(&sinfo->lock); \ |
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trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \ |
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trace_btrfs_space_reservation(fs_info, trace_name, \ |
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sinfo->flags, abs_bytes, \ |
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bytes > 0); \ |
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if (bytes < 0 && sinfo->name < -bytes) { \ |
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WARN_ON(1); \ |
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sinfo->name = 0; \ |
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return; \ |
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} \ |
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sinfo->name += bytes; \ |
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} |
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DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info"); |
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DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned"); |
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int btrfs_init_space_info(struct btrfs_fs_info *fs_info); |
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void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags, |
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u64 total_bytes, u64 bytes_used, |
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u64 bytes_readonly, u64 bytes_zone_unusable, |
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struct btrfs_space_info **space_info); |
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struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info, |
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u64 flags); |
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u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info, |
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bool may_use_included); |
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void btrfs_clear_space_info_full(struct btrfs_fs_info *info); |
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void btrfs_dump_space_info(struct btrfs_fs_info *fs_info, |
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struct btrfs_space_info *info, u64 bytes, |
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int dump_block_groups); |
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int btrfs_reserve_metadata_bytes(struct btrfs_root *root, |
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struct btrfs_block_rsv *block_rsv, |
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u64 orig_bytes, |
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enum btrfs_reserve_flush_enum flush); |
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void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info, |
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struct btrfs_space_info *space_info); |
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int btrfs_can_overcommit(struct btrfs_fs_info *fs_info, |
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struct btrfs_space_info *space_info, u64 bytes, |
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enum btrfs_reserve_flush_enum flush); |
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static inline void btrfs_space_info_free_bytes_may_use( |
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struct btrfs_fs_info *fs_info, |
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struct btrfs_space_info *space_info, |
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u64 num_bytes) |
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{ |
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spin_lock(&space_info->lock); |
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btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes); |
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btrfs_try_granting_tickets(fs_info, space_info); |
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spin_unlock(&space_info->lock); |
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} |
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int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes, |
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enum btrfs_reserve_flush_enum flush); |
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static inline void __btrfs_mod_total_bytes_pinned( |
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struct btrfs_space_info *space_info, |
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s64 mod) |
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{ |
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percpu_counter_add_batch(&space_info->total_bytes_pinned, mod, |
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BTRFS_TOTAL_BYTES_PINNED_BATCH); |
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} |
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static inline void btrfs_mod_total_bytes_pinned(struct btrfs_fs_info *fs_info, |
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u64 flags, s64 mod) |
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{ |
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struct btrfs_space_info *space_info = btrfs_find_space_info(fs_info, flags); |
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ASSERT(space_info); |
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__btrfs_mod_total_bytes_pinned(space_info, mod); |
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} |
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#endif /* BTRFS_SPACE_INFO_H */
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