1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef BTRFS_BLOCK_GROUP_H 4 #define BTRFS_BLOCK_GROUP_H 5 6 #include "free-space-cache.h" 7 8 enum btrfs_disk_cache_state { 9 BTRFS_DC_WRITTEN, 10 BTRFS_DC_ERROR, 11 BTRFS_DC_CLEAR, 12 BTRFS_DC_SETUP, 13 }; 14 15 /* 16 * Control flags for do_chunk_alloc's force field CHUNK_ALLOC_NO_FORCE means to 17 * only allocate a chunk if we really need one. 18 * 19 * CHUNK_ALLOC_LIMITED means to only try and allocate one if we have very few 20 * chunks already allocated. This is used as part of the clustering code to 21 * help make sure we have a good pool of storage to cluster in, without filling 22 * the FS with empty chunks 23 * 24 * CHUNK_ALLOC_FORCE means it must try to allocate one 25 */ 26 enum btrfs_chunk_alloc_enum { 27 CHUNK_ALLOC_NO_FORCE, 28 CHUNK_ALLOC_LIMITED, 29 CHUNK_ALLOC_FORCE, 30 }; 31 32 struct btrfs_caching_control { 33 struct list_head list; 34 struct mutex mutex; 35 wait_queue_head_t wait; 36 struct btrfs_work work; 37 struct btrfs_block_group *block_group; 38 u64 progress; 39 refcount_t count; 40 }; 41 42 /* Once caching_thread() finds this much free space, it will wake up waiters. */ 43 #define CACHING_CTL_WAKE_UP SZ_2M 44 45 struct btrfs_block_group { 46 struct btrfs_fs_info *fs_info; 47 struct inode *inode; 48 spinlock_t lock; 49 u64 start; 50 u64 length; 51 u64 pinned; 52 u64 reserved; 53 u64 used; 54 u64 delalloc_bytes; 55 u64 bytes_super; 56 u64 flags; 57 u64 cache_generation; 58 59 /* 60 * If the free space extent count exceeds this number, convert the block 61 * group to bitmaps. 62 */ 63 u32 bitmap_high_thresh; 64 65 /* 66 * If the free space extent count drops below this number, convert the 67 * block group back to extents. 68 */ 69 u32 bitmap_low_thresh; 70 71 /* 72 * It is just used for the delayed data space allocation because 73 * only the data space allocation and the relative metadata update 74 * can be done cross the transaction. 75 */ 76 struct rw_semaphore data_rwsem; 77 78 /* For raid56, this is a full stripe, without parity */ 79 unsigned long full_stripe_len; 80 81 unsigned int ro; 82 unsigned int iref:1; 83 unsigned int has_caching_ctl:1; 84 unsigned int removed:1; 85 86 int disk_cache_state; 87 88 /* Cache tracking stuff */ 89 int cached; 90 struct btrfs_caching_control *caching_ctl; 91 u64 last_byte_to_unpin; 92 93 struct btrfs_space_info *space_info; 94 95 /* Free space cache stuff */ 96 struct btrfs_free_space_ctl *free_space_ctl; 97 98 /* Block group cache stuff */ 99 struct rb_node cache_node; 100 101 /* For block groups in the same raid type */ 102 struct list_head list; 103 104 /* Usage count */ 105 atomic_t count; 106 107 /* 108 * List of struct btrfs_free_clusters for this block group. 109 * Today it will only have one thing on it, but that may change 110 */ 111 struct list_head cluster_list; 112 113 /* For delayed block group creation or deletion of empty block groups */ 114 struct list_head bg_list; 115 116 /* For read-only block groups */ 117 struct list_head ro_list; 118 119 atomic_t trimming; 120 121 /* For dirty block groups */ 122 struct list_head dirty_list; 123 struct list_head io_list; 124 125 struct btrfs_io_ctl io_ctl; 126 127 /* 128 * Incremented when doing extent allocations and holding a read lock 129 * on the space_info's groups_sem semaphore. 130 * Decremented when an ordered extent that represents an IO against this 131 * block group's range is created (after it's added to its inode's 132 * root's list of ordered extents) or immediately after the allocation 133 * if it's a metadata extent or fallocate extent (for these cases we 134 * don't create ordered extents). 135 */ 136 atomic_t reservations; 137 138 /* 139 * Incremented while holding the spinlock *lock* by a task checking if 140 * it can perform a nocow write (incremented if the value for the *ro* 141 * field is 0). Decremented by such tasks once they create an ordered 142 * extent or before that if some error happens before reaching that step. 143 * This is to prevent races between block group relocation and nocow 144 * writes through direct IO. 145 */ 146 atomic_t nocow_writers; 147 148 /* Lock for free space tree operations. */ 149 struct mutex free_space_lock; 150 151 /* 152 * Does the block group need to be added to the free space tree? 153 * Protected by free_space_lock. 154 */ 155 int needs_free_space; 156 157 /* Record locked full stripes for RAID5/6 block group */ 158 struct btrfs_full_stripe_locks_tree full_stripe_locks_root; 159 }; 160 161 #ifdef CONFIG_BTRFS_DEBUG 162 static inline int btrfs_should_fragment_free_space( 163 struct btrfs_block_group *block_group) 164 { 165 struct btrfs_fs_info *fs_info = block_group->fs_info; 166 167 return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) && 168 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) || 169 (btrfs_test_opt(fs_info, FRAGMENT_DATA) && 170 block_group->flags & BTRFS_BLOCK_GROUP_DATA); 171 } 172 #endif 173 174 struct btrfs_block_group *btrfs_lookup_first_block_group( 175 struct btrfs_fs_info *info, u64 bytenr); 176 struct btrfs_block_group *btrfs_lookup_block_group( 177 struct btrfs_fs_info *info, u64 bytenr); 178 struct btrfs_block_group *btrfs_next_block_group( 179 struct btrfs_block_group *cache); 180 void btrfs_get_block_group(struct btrfs_block_group *cache); 181 void btrfs_put_block_group(struct btrfs_block_group *cache); 182 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info, 183 const u64 start); 184 void btrfs_wait_block_group_reservations(struct btrfs_block_group *bg); 185 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr); 186 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr); 187 void btrfs_wait_nocow_writers(struct btrfs_block_group *bg); 188 void btrfs_wait_block_group_cache_progress(struct btrfs_block_group *cache, 189 u64 num_bytes); 190 int btrfs_wait_block_group_cache_done(struct btrfs_block_group *cache); 191 int btrfs_cache_block_group(struct btrfs_block_group *cache, 192 int load_cache_only); 193 void btrfs_put_caching_control(struct btrfs_caching_control *ctl); 194 struct btrfs_caching_control *btrfs_get_caching_control( 195 struct btrfs_block_group *cache); 196 u64 add_new_free_space(struct btrfs_block_group *block_group, 197 u64 start, u64 end); 198 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group( 199 struct btrfs_fs_info *fs_info, 200 const u64 chunk_offset); 201 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 202 u64 group_start, struct extent_map *em); 203 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info); 204 void btrfs_mark_bg_unused(struct btrfs_block_group *bg); 205 int btrfs_read_block_groups(struct btrfs_fs_info *info); 206 int btrfs_make_block_group(struct btrfs_trans_handle *trans, u64 bytes_used, 207 u64 type, u64 chunk_offset, u64 size); 208 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans); 209 int btrfs_inc_block_group_ro(struct btrfs_block_group *cache, 210 bool do_chunk_alloc); 211 void btrfs_dec_block_group_ro(struct btrfs_block_group *cache); 212 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans); 213 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans); 214 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans); 215 int btrfs_update_block_group(struct btrfs_trans_handle *trans, 216 u64 bytenr, u64 num_bytes, int alloc); 217 int btrfs_add_reserved_bytes(struct btrfs_block_group *cache, 218 u64 ram_bytes, u64 num_bytes, int delalloc); 219 void btrfs_free_reserved_bytes(struct btrfs_block_group *cache, 220 u64 num_bytes, int delalloc); 221 int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags, 222 enum btrfs_chunk_alloc_enum force); 223 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type); 224 void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type); 225 u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags); 226 void btrfs_put_block_group_cache(struct btrfs_fs_info *info); 227 int btrfs_free_block_groups(struct btrfs_fs_info *info); 228 229 static inline u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info) 230 { 231 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_DATA); 232 } 233 234 static inline u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info) 235 { 236 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_METADATA); 237 } 238 239 static inline u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info) 240 { 241 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); 242 } 243 244 static inline int btrfs_block_group_done(struct btrfs_block_group *cache) 245 { 246 smp_mb(); 247 return cache->cached == BTRFS_CACHE_FINISHED || 248 cache->cached == BTRFS_CACHE_ERROR; 249 } 250 251 #endif /* BTRFS_BLOCK_GROUP_H */ 252