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