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 /* 59 * Size of space that needs to be reclaimed in order to satisfy pending 60 * tickets 61 */ 62 u64 reclaim_size; 63 64 /* 65 * tickets_id just indicates the next ticket will be handled, so note 66 * it's not stored per ticket. 67 */ 68 u64 tickets_id; 69 70 struct rw_semaphore groups_sem; 71 /* for block groups in our same type */ 72 struct list_head block_groups[BTRFS_NR_RAID_TYPES]; 73 74 struct kobject kobj; 75 struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES]; 76 }; 77 78 struct reserve_ticket { 79 u64 bytes; 80 int error; 81 bool steal; 82 struct list_head list; 83 wait_queue_head_t wait; 84 }; 85 86 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) 87 { 88 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && 89 (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); 90 } 91 92 /* 93 * 94 * Declare a helper function to detect underflow of various space info members 95 */ 96 #define DECLARE_SPACE_INFO_UPDATE(name, trace_name) \ 97 static inline void \ 98 btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \ 99 struct btrfs_space_info *sinfo, \ 100 s64 bytes) \ 101 { \ 102 const u64 abs_bytes = (bytes < 0) ? -bytes : bytes; \ 103 lockdep_assert_held(&sinfo->lock); \ 104 trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \ 105 trace_btrfs_space_reservation(fs_info, trace_name, \ 106 sinfo->flags, abs_bytes, \ 107 bytes > 0); \ 108 if (bytes < 0 && sinfo->name < -bytes) { \ 109 WARN_ON(1); \ 110 sinfo->name = 0; \ 111 return; \ 112 } \ 113 sinfo->name += bytes; \ 114 } 115 116 DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info"); 117 DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned"); 118 119 int btrfs_init_space_info(struct btrfs_fs_info *fs_info); 120 void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags, 121 u64 total_bytes, u64 bytes_used, 122 u64 bytes_readonly, 123 struct btrfs_space_info **space_info); 124 struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info, 125 u64 flags); 126 u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info, 127 bool may_use_included); 128 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 129 void btrfs_dump_space_info(struct btrfs_fs_info *fs_info, 130 struct btrfs_space_info *info, u64 bytes, 131 int dump_block_groups); 132 int btrfs_reserve_metadata_bytes(struct btrfs_root *root, 133 struct btrfs_block_rsv *block_rsv, 134 u64 orig_bytes, 135 enum btrfs_reserve_flush_enum flush); 136 void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info, 137 struct btrfs_space_info *space_info); 138 int btrfs_can_overcommit(struct btrfs_fs_info *fs_info, 139 struct btrfs_space_info *space_info, u64 bytes, 140 enum btrfs_reserve_flush_enum flush); 141 142 static inline void btrfs_space_info_free_bytes_may_use( 143 struct btrfs_fs_info *fs_info, 144 struct btrfs_space_info *space_info, 145 u64 num_bytes) 146 { 147 spin_lock(&space_info->lock); 148 btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes); 149 btrfs_try_granting_tickets(fs_info, space_info); 150 spin_unlock(&space_info->lock); 151 } 152 int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes, 153 enum btrfs_reserve_flush_enum flush); 154 155 #endif /* BTRFS_SPACE_INFO_H */ 156