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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef BTRFS_SPACE_INFO_H
- #define BTRFS_SPACE_INFO_H
- 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 max_extent_size; /* This will hold the maximum extent size of
- the space info if we had an ENOSPC in the
- allocator. */
- 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;
- /*
- * bytes_pinned is kept in line with what is actually pinned, as in
- * we've called update_block_group and dropped the bytes_used counter
- * and increased the bytes_pinned counter. However this means that
- * bytes_pinned does not reflect the bytes that will be pinned once the
- * delayed refs are flushed, so this counter is inc'ed every time we
- * call btrfs_free_extent so it is a realtime count of what will be
- * freed once the transaction is committed. It will be zeroed every
- * time the transaction commits.
- */
- struct percpu_counter total_bytes_pinned;
- struct list_head list;
- /* Protected by the spinlock 'lock'. */
- struct list_head ro_bgs;
- struct list_head priority_tickets;
- struct list_head tickets;
- /*
- * 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];
- wait_queue_head_t wait;
- 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_update_space_info(struct btrfs_fs_info *info, u64 flags,
- u64 total_bytes, u64 bytes_used,
- u64 bytes_readonly,
- struct btrfs_space_info **space_info);
- struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
- u64 flags);
- u64 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_root *root,
- struct btrfs_block_rsv *block_rsv,
- 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);
- }
- #endif /* BTRFS_SPACE_INFO_H */
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