1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef BTRFS_SPACE_INFO_H 4 #define BTRFS_SPACE_INFO_H 5 6 struct btrfs_space_info { 7 spinlock_t lock; 8 9 u64 total_bytes; /* total bytes in the space, 10 this doesn't take mirrors into account */ 11 u64 bytes_used; /* total bytes used, 12 this doesn't take mirrors into account */ 13 u64 bytes_pinned; /* total bytes pinned, will be freed when the 14 transaction finishes */ 15 u64 bytes_reserved; /* total bytes the allocator has reserved for 16 current allocations */ 17 u64 bytes_may_use; /* number of bytes that may be used for 18 delalloc/allocations */ 19 u64 bytes_readonly; /* total bytes that are read only */ 20 21 u64 max_extent_size; /* This will hold the maximum extent size of 22 the space info if we had an ENOSPC in the 23 allocator. */ 24 25 unsigned int full:1; /* indicates that we cannot allocate any more 26 chunks for this space */ 27 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */ 28 29 unsigned int flush:1; /* set if we are trying to make space */ 30 31 unsigned int force_alloc; /* set if we need to force a chunk 32 alloc for this space */ 33 34 u64 disk_used; /* total bytes used on disk */ 35 u64 disk_total; /* total bytes on disk, takes mirrors into 36 account */ 37 38 u64 flags; 39 40 /* 41 * bytes_pinned is kept in line with what is actually pinned, as in 42 * we've called update_block_group and dropped the bytes_used counter 43 * and increased the bytes_pinned counter. However this means that 44 * bytes_pinned does not reflect the bytes that will be pinned once the 45 * delayed refs are flushed, so this counter is inc'ed every time we 46 * call btrfs_free_extent so it is a realtime count of what will be 47 * freed once the transaction is committed. It will be zeroed every 48 * time the transaction commits. 49 */ 50 struct percpu_counter total_bytes_pinned; 51 52 struct list_head list; 53 /* Protected by the spinlock 'lock'. */ 54 struct list_head ro_bgs; 55 struct list_head priority_tickets; 56 struct list_head tickets; 57 /* 58 * tickets_id just indicates the next ticket will be handled, so note 59 * it's not stored per ticket. 60 */ 61 u64 tickets_id; 62 63 struct rw_semaphore groups_sem; 64 /* for block groups in our same type */ 65 struct list_head block_groups[BTRFS_NR_RAID_TYPES]; 66 67 struct kobject kobj; 68 struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES]; 69 }; 70 71 struct reserve_ticket { 72 u64 bytes; 73 int error; 74 struct list_head list; 75 wait_queue_head_t wait; 76 }; 77 78 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) 79 { 80 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && 81 (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); 82 } 83 84 /* 85 * 86 * Declare a helper function to detect underflow of various space info members 87 */ 88 #define DECLARE_SPACE_INFO_UPDATE(name, trace_name) \ 89 static inline void \ 90 btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \ 91 struct btrfs_space_info *sinfo, \ 92 s64 bytes) \ 93 { \ 94 const u64 abs_bytes = (bytes < 0) ? -bytes : bytes; \ 95 lockdep_assert_held(&sinfo->lock); \ 96 trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \ 97 trace_btrfs_space_reservation(fs_info, trace_name, \ 98 sinfo->flags, abs_bytes, \ 99 bytes > 0); \ 100 if (bytes < 0 && sinfo->name < -bytes) { \ 101 WARN_ON(1); \ 102 sinfo->name = 0; \ 103 return; \ 104 } \ 105 sinfo->name += bytes; \ 106 } 107 108 DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info"); 109 DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned"); 110 111 int btrfs_init_space_info(struct btrfs_fs_info *fs_info); 112 void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags, 113 u64 total_bytes, u64 bytes_used, 114 u64 bytes_readonly, 115 struct btrfs_space_info **space_info); 116 struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info, 117 u64 flags); 118 u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info, 119 bool may_use_included); 120 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 121 void btrfs_dump_space_info(struct btrfs_fs_info *fs_info, 122 struct btrfs_space_info *info, u64 bytes, 123 int dump_block_groups); 124 int btrfs_reserve_metadata_bytes(struct btrfs_root *root, 125 struct btrfs_block_rsv *block_rsv, 126 u64 orig_bytes, 127 enum btrfs_reserve_flush_enum flush); 128 void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info, 129 struct btrfs_space_info *space_info); 130 int btrfs_can_overcommit(struct btrfs_fs_info *fs_info, 131 struct btrfs_space_info *space_info, u64 bytes, 132 enum btrfs_reserve_flush_enum flush); 133 134 static inline void btrfs_space_info_free_bytes_may_use( 135 struct btrfs_fs_info *fs_info, 136 struct btrfs_space_info *space_info, 137 u64 num_bytes) 138 { 139 spin_lock(&space_info->lock); 140 btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes); 141 btrfs_try_granting_tickets(fs_info, space_info); 142 spin_unlock(&space_info->lock); 143 } 144 145 #endif /* BTRFS_SPACE_INFO_H */ 146