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 * This describes the state of the block_group for async discard. This is due 17 * to the two pass nature of it where extent discarding is prioritized over 18 * bitmap discarding. BTRFS_DISCARD_RESET_CURSOR is set when we are resetting 19 * between lists to prevent contention for discard state variables 20 * (eg. discard_cursor). 21 */ 22 enum btrfs_discard_state { 23 BTRFS_DISCARD_EXTENTS, 24 BTRFS_DISCARD_BITMAPS, 25 BTRFS_DISCARD_RESET_CURSOR, 26 }; 27 28 /* 29 * Control flags for do_chunk_alloc's force field CHUNK_ALLOC_NO_FORCE means to 30 * only allocate a chunk if we really need one. 31 * 32 * CHUNK_ALLOC_LIMITED means to only try and allocate one if we have very few 33 * chunks already allocated. This is used as part of the clustering code to 34 * help make sure we have a good pool of storage to cluster in, without filling 35 * the FS with empty chunks 36 * 37 * CHUNK_ALLOC_FORCE means it must try to allocate one 38 * 39 * CHUNK_ALLOC_FORCE_FOR_EXTENT like CHUNK_ALLOC_FORCE but called from 40 * find_free_extent() that also activaes the zone 41 */ 42 enum btrfs_chunk_alloc_enum { 43 CHUNK_ALLOC_NO_FORCE, 44 CHUNK_ALLOC_LIMITED, 45 CHUNK_ALLOC_FORCE, 46 CHUNK_ALLOC_FORCE_FOR_EXTENT, 47 }; 48 49 struct btrfs_caching_control { 50 struct list_head list; 51 struct mutex mutex; 52 wait_queue_head_t wait; 53 struct btrfs_work work; 54 struct btrfs_block_group *block_group; 55 u64 progress; 56 refcount_t count; 57 }; 58 59 /* Once caching_thread() finds this much free space, it will wake up waiters. */ 60 #define CACHING_CTL_WAKE_UP SZ_2M 61 62 struct btrfs_block_group { 63 struct btrfs_fs_info *fs_info; 64 struct inode *inode; 65 spinlock_t lock; 66 u64 start; 67 u64 length; 68 u64 pinned; 69 u64 reserved; 70 u64 used; 71 u64 delalloc_bytes; 72 u64 bytes_super; 73 u64 flags; 74 u64 cache_generation; 75 u64 global_root_id; 76 77 /* 78 * If the free space extent count exceeds this number, convert the block 79 * group to bitmaps. 80 */ 81 u32 bitmap_high_thresh; 82 83 /* 84 * If the free space extent count drops below this number, convert the 85 * block group back to extents. 86 */ 87 u32 bitmap_low_thresh; 88 89 /* 90 * It is just used for the delayed data space allocation because 91 * only the data space allocation and the relative metadata update 92 * can be done cross the transaction. 93 */ 94 struct rw_semaphore data_rwsem; 95 96 /* For raid56, this is a full stripe, without parity */ 97 unsigned long full_stripe_len; 98 99 unsigned int ro; 100 unsigned int iref:1; 101 unsigned int has_caching_ctl:1; 102 unsigned int removed:1; 103 unsigned int to_copy:1; 104 unsigned int relocating_repair:1; 105 unsigned int chunk_item_inserted:1; 106 unsigned int zone_is_active:1; 107 unsigned int zoned_data_reloc_ongoing:1; 108 109 int disk_cache_state; 110 111 /* Cache tracking stuff */ 112 int cached; 113 struct btrfs_caching_control *caching_ctl; 114 u64 last_byte_to_unpin; 115 116 struct btrfs_space_info *space_info; 117 118 /* Free space cache stuff */ 119 struct btrfs_free_space_ctl *free_space_ctl; 120 121 /* Block group cache stuff */ 122 struct rb_node cache_node; 123 124 /* For block groups in the same raid type */ 125 struct list_head list; 126 127 refcount_t refs; 128 129 /* 130 * List of struct btrfs_free_clusters for this block group. 131 * Today it will only have one thing on it, but that may change 132 */ 133 struct list_head cluster_list; 134 135 /* For delayed block group creation or deletion of empty block groups */ 136 struct list_head bg_list; 137 138 /* For read-only block groups */ 139 struct list_head ro_list; 140 141 /* 142 * When non-zero it means the block group's logical address and its 143 * device extents can not be reused for future block group allocations 144 * until the counter goes down to 0. This is to prevent them from being 145 * reused while some task is still using the block group after it was 146 * deleted - we want to make sure they can only be reused for new block 147 * groups after that task is done with the deleted block group. 148 */ 149 atomic_t frozen; 150 151 /* For discard operations */ 152 struct list_head discard_list; 153 int discard_index; 154 u64 discard_eligible_time; 155 u64 discard_cursor; 156 enum btrfs_discard_state discard_state; 157 158 /* For dirty block groups */ 159 struct list_head dirty_list; 160 struct list_head io_list; 161 162 struct btrfs_io_ctl io_ctl; 163 164 /* 165 * Incremented when doing extent allocations and holding a read lock 166 * on the space_info's groups_sem semaphore. 167 * Decremented when an ordered extent that represents an IO against this 168 * block group's range is created (after it's added to its inode's 169 * root's list of ordered extents) or immediately after the allocation 170 * if it's a metadata extent or fallocate extent (for these cases we 171 * don't create ordered extents). 172 */ 173 atomic_t reservations; 174 175 /* 176 * Incremented while holding the spinlock *lock* by a task checking if 177 * it can perform a nocow write (incremented if the value for the *ro* 178 * field is 0). Decremented by such tasks once they create an ordered 179 * extent or before that if some error happens before reaching that step. 180 * This is to prevent races between block group relocation and nocow 181 * writes through direct IO. 182 */ 183 atomic_t nocow_writers; 184 185 /* Lock for free space tree operations. */ 186 struct mutex free_space_lock; 187 188 /* 189 * Does the block group need to be added to the free space tree? 190 * Protected by free_space_lock. 191 */ 192 int needs_free_space; 193 194 /* Flag indicating this block group is placed on a sequential zone */ 195 bool seq_zone; 196 197 /* 198 * Number of extents in this block group used for swap files. 199 * All accesses protected by the spinlock 'lock'. 200 */ 201 int swap_extents; 202 203 /* Record locked full stripes for RAID5/6 block group */ 204 struct btrfs_full_stripe_locks_tree full_stripe_locks_root; 205 206 /* 207 * Allocation offset for the block group to implement sequential 208 * allocation. This is used only on a zoned filesystem. 209 */ 210 u64 alloc_offset; 211 u64 zone_unusable; 212 u64 zone_capacity; 213 u64 meta_write_pointer; 214 struct map_lookup *physical_map; 215 struct list_head active_bg_list; 216 struct work_struct zone_finish_work; 217 struct extent_buffer *last_eb; 218 }; 219 220 static inline u64 btrfs_block_group_end(struct btrfs_block_group *block_group) 221 { 222 return (block_group->start + block_group->length); 223 } 224 225 static inline bool btrfs_is_block_group_data_only( 226 struct btrfs_block_group *block_group) 227 { 228 /* 229 * In mixed mode the fragmentation is expected to be high, lowering the 230 * efficiency, so only proper data block groups are considered. 231 */ 232 return (block_group->flags & BTRFS_BLOCK_GROUP_DATA) && 233 !(block_group->flags & BTRFS_BLOCK_GROUP_METADATA); 234 } 235 236 #ifdef CONFIG_BTRFS_DEBUG 237 static inline int btrfs_should_fragment_free_space( 238 struct btrfs_block_group *block_group) 239 { 240 struct btrfs_fs_info *fs_info = block_group->fs_info; 241 242 return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) && 243 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) || 244 (btrfs_test_opt(fs_info, FRAGMENT_DATA) && 245 block_group->flags & BTRFS_BLOCK_GROUP_DATA); 246 } 247 #endif 248 249 struct btrfs_block_group *btrfs_lookup_first_block_group( 250 struct btrfs_fs_info *info, u64 bytenr); 251 struct btrfs_block_group *btrfs_lookup_block_group( 252 struct btrfs_fs_info *info, u64 bytenr); 253 struct btrfs_block_group *btrfs_next_block_group( 254 struct btrfs_block_group *cache); 255 void btrfs_get_block_group(struct btrfs_block_group *cache); 256 void btrfs_put_block_group(struct btrfs_block_group *cache); 257 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info, 258 const u64 start); 259 void btrfs_wait_block_group_reservations(struct btrfs_block_group *bg); 260 struct btrfs_block_group *btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, 261 u64 bytenr); 262 void btrfs_dec_nocow_writers(struct btrfs_block_group *bg); 263 void btrfs_wait_nocow_writers(struct btrfs_block_group *bg); 264 void btrfs_wait_block_group_cache_progress(struct btrfs_block_group *cache, 265 u64 num_bytes); 266 int btrfs_cache_block_group(struct btrfs_block_group *cache, bool wait); 267 void btrfs_put_caching_control(struct btrfs_caching_control *ctl); 268 struct btrfs_caching_control *btrfs_get_caching_control( 269 struct btrfs_block_group *cache); 270 u64 add_new_free_space(struct btrfs_block_group *block_group, 271 u64 start, u64 end); 272 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group( 273 struct btrfs_fs_info *fs_info, 274 const u64 chunk_offset); 275 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 276 u64 group_start, struct extent_map *em); 277 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info); 278 void btrfs_mark_bg_unused(struct btrfs_block_group *bg); 279 void btrfs_reclaim_bgs_work(struct work_struct *work); 280 void btrfs_reclaim_bgs(struct btrfs_fs_info *fs_info); 281 void btrfs_mark_bg_to_reclaim(struct btrfs_block_group *bg); 282 int btrfs_read_block_groups(struct btrfs_fs_info *info); 283 struct btrfs_block_group *btrfs_make_block_group(struct btrfs_trans_handle *trans, 284 u64 bytes_used, u64 type, 285 u64 chunk_offset, u64 size); 286 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans); 287 int btrfs_inc_block_group_ro(struct btrfs_block_group *cache, 288 bool do_chunk_alloc); 289 void btrfs_dec_block_group_ro(struct btrfs_block_group *cache); 290 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans); 291 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans); 292 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans); 293 int btrfs_update_block_group(struct btrfs_trans_handle *trans, 294 u64 bytenr, u64 num_bytes, bool alloc); 295 int btrfs_add_reserved_bytes(struct btrfs_block_group *cache, 296 u64 ram_bytes, u64 num_bytes, int delalloc); 297 void btrfs_free_reserved_bytes(struct btrfs_block_group *cache, 298 u64 num_bytes, int delalloc); 299 int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags, 300 enum btrfs_chunk_alloc_enum force); 301 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type); 302 void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type); 303 void btrfs_reserve_chunk_metadata(struct btrfs_trans_handle *trans, 304 bool is_item_insertion); 305 u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags); 306 void btrfs_put_block_group_cache(struct btrfs_fs_info *info); 307 int btrfs_free_block_groups(struct btrfs_fs_info *info); 308 void btrfs_wait_space_cache_v1_finished(struct btrfs_block_group *cache, 309 struct btrfs_caching_control *caching_ctl); 310 int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start, 311 struct block_device *bdev, u64 physical, u64 **logical, 312 int *naddrs, int *stripe_len); 313 314 static inline u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info) 315 { 316 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_DATA); 317 } 318 319 static inline u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info) 320 { 321 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_METADATA); 322 } 323 324 static inline u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info) 325 { 326 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); 327 } 328 329 static inline int btrfs_block_group_done(struct btrfs_block_group *cache) 330 { 331 smp_mb(); 332 return cache->cached == BTRFS_CACHE_FINISHED || 333 cache->cached == BTRFS_CACHE_ERROR; 334 } 335 336 void btrfs_freeze_block_group(struct btrfs_block_group *cache); 337 void btrfs_unfreeze_block_group(struct btrfs_block_group *cache); 338 339 bool btrfs_inc_block_group_swap_extents(struct btrfs_block_group *bg); 340 void btrfs_dec_block_group_swap_extents(struct btrfs_block_group *bg, int amount); 341 342 #endif /* BTRFS_BLOCK_GROUP_H */ 343