146 lines
4.8 KiB
C
146 lines
4.8 KiB
C
/* 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 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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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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* 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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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,
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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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#endif /* BTRFS_SPACE_INFO_H */
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