diff options
Diffstat (limited to 'fs/btrfs/space-info.h')
| -rw-r--r-- | fs/btrfs/space-info.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/fs/btrfs/space-info.h b/fs/btrfs/space-info.h new file mode 100644 index 000000000000..c2b54b8e1a14 --- /dev/null +++ b/fs/btrfs/space-info.h @@ -0,0 +1,133 @@ +/* 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 orig_bytes; + u64 bytes; + int error; + 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) \ +static inline void \ +btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \ + struct btrfs_space_info *sinfo, \ + s64 bytes) \ +{ \ + lockdep_assert_held(&sinfo->lock); \ + trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \ + if (bytes < 0 && sinfo->name < -bytes) { \ + WARN_ON(1); \ + sinfo->name = 0; \ + return; \ + } \ + sinfo->name += bytes; \ +} + +DECLARE_SPACE_INFO_UPDATE(bytes_may_use); +DECLARE_SPACE_INFO_UPDATE(bytes_pinned); + +void btrfs_space_info_add_new_bytes(struct btrfs_fs_info *fs_info, + struct btrfs_space_info *space_info, + u64 num_bytes); +void btrfs_space_info_add_old_bytes(struct btrfs_fs_info *fs_info, + struct btrfs_space_info *space_info, + u64 num_bytes); +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); + +#endif /* BTRFS_SPACE_INFO_H */ |