1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef BTRFS_BLOCK_GROUP_H
4 #define BTRFS_BLOCK_GROUP_H
6 #include "free-space-cache.h"
8 struct btrfs_chunk_map;
10 enum btrfs_disk_cache_state {
17 enum btrfs_block_group_size_class {
20 /* 0 < size <= 128K */
22 /* 128K < size <= 8M */
24 /* 8M < size < BG_LENGTH */
29 * This describes the state of the block_group for async discard. This is due
30 * to the two pass nature of it where extent discarding is prioritized over
31 * bitmap discarding. BTRFS_DISCARD_RESET_CURSOR is set when we are resetting
32 * between lists to prevent contention for discard state variables
33 * (eg. discard_cursor).
35 enum btrfs_discard_state {
36 BTRFS_DISCARD_EXTENTS,
37 BTRFS_DISCARD_BITMAPS,
38 BTRFS_DISCARD_RESET_CURSOR,
42 * Control flags for do_chunk_alloc's force field CHUNK_ALLOC_NO_FORCE means to
43 * only allocate a chunk if we really need one.
45 * CHUNK_ALLOC_LIMITED means to only try and allocate one if we have very few
46 * chunks already allocated. This is used as part of the clustering code to
47 * help make sure we have a good pool of storage to cluster in, without filling
48 * the FS with empty chunks
50 * CHUNK_ALLOC_FORCE means it must try to allocate one
52 * CHUNK_ALLOC_FORCE_FOR_EXTENT like CHUNK_ALLOC_FORCE but called from
53 * find_free_extent() that also activaes the zone
55 enum btrfs_chunk_alloc_enum {
59 CHUNK_ALLOC_FORCE_FOR_EXTENT,
62 /* Block group flags set at runtime */
63 enum btrfs_block_group_flags {
64 BLOCK_GROUP_FLAG_IREF,
65 BLOCK_GROUP_FLAG_REMOVED,
66 BLOCK_GROUP_FLAG_TO_COPY,
67 BLOCK_GROUP_FLAG_RELOCATING_REPAIR,
68 BLOCK_GROUP_FLAG_CHUNK_ITEM_INSERTED,
69 BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
70 BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
71 /* Does the block group need to be added to the free space tree? */
72 BLOCK_GROUP_FLAG_NEEDS_FREE_SPACE,
73 /* Indicate that the block group is placed on a sequential zone */
74 BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE,
76 * Indicate that block group is in the list of new block groups of a
82 enum btrfs_caching_type {
89 struct btrfs_caching_control {
90 struct list_head list;
92 wait_queue_head_t wait;
93 struct btrfs_work work;
94 struct btrfs_block_group *block_group;
95 /* Track progress of caching during allocation. */
100 /* Once caching_thread() finds this much free space, it will wake up waiters. */
101 #define CACHING_CTL_WAKE_UP SZ_2M
103 struct btrfs_block_group {
104 struct btrfs_fs_info *fs_info;
115 u64 cache_generation;
119 * The last committed used bytes of this block group, if the above @used
120 * is still the same as @commit_used, we don't need to update block
121 * group item of this block group.
125 * If the free space extent count exceeds this number, convert the block
128 u32 bitmap_high_thresh;
131 * If the free space extent count drops below this number, convert the
132 * block group back to extents.
134 u32 bitmap_low_thresh;
137 * It is just used for the delayed data space allocation because
138 * only the data space allocation and the relative metadata update
139 * can be done cross the transaction.
141 struct rw_semaphore data_rwsem;
143 /* For raid56, this is a full stripe, without parity */
144 unsigned long full_stripe_len;
145 unsigned long runtime_flags;
149 int disk_cache_state;
151 /* Cache tracking stuff */
153 struct btrfs_caching_control *caching_ctl;
155 struct btrfs_space_info *space_info;
157 /* Free space cache stuff */
158 struct btrfs_free_space_ctl *free_space_ctl;
160 /* Block group cache stuff */
161 struct rb_node cache_node;
163 /* For block groups in the same raid type */
164 struct list_head list;
169 * List of struct btrfs_free_clusters for this block group.
170 * Today it will only have one thing on it, but that may change
172 struct list_head cluster_list;
175 * Used for several lists:
177 * 1) struct btrfs_fs_info::unused_bgs
178 * 2) struct btrfs_fs_info::reclaim_bgs
179 * 3) struct btrfs_transaction::deleted_bgs
180 * 4) struct btrfs_trans_handle::new_bgs
182 struct list_head bg_list;
184 /* For read-only block groups */
185 struct list_head ro_list;
188 * When non-zero it means the block group's logical address and its
189 * device extents can not be reused for future block group allocations
190 * until the counter goes down to 0. This is to prevent them from being
191 * reused while some task is still using the block group after it was
192 * deleted - we want to make sure they can only be reused for new block
193 * groups after that task is done with the deleted block group.
197 /* For discard operations */
198 struct list_head discard_list;
200 u64 discard_eligible_time;
202 enum btrfs_discard_state discard_state;
204 /* For dirty block groups */
205 struct list_head dirty_list;
206 struct list_head io_list;
208 struct btrfs_io_ctl io_ctl;
211 * Incremented when doing extent allocations and holding a read lock
212 * on the space_info's groups_sem semaphore.
213 * Decremented when an ordered extent that represents an IO against this
214 * block group's range is created (after it's added to its inode's
215 * root's list of ordered extents) or immediately after the allocation
216 * if it's a metadata extent or fallocate extent (for these cases we
217 * don't create ordered extents).
219 atomic_t reservations;
222 * Incremented while holding the spinlock *lock* by a task checking if
223 * it can perform a nocow write (incremented if the value for the *ro*
224 * field is 0). Decremented by such tasks once they create an ordered
225 * extent or before that if some error happens before reaching that step.
226 * This is to prevent races between block group relocation and nocow
227 * writes through direct IO.
229 atomic_t nocow_writers;
231 /* Lock for free space tree operations. */
232 struct mutex free_space_lock;
235 * Number of extents in this block group used for swap files.
236 * All accesses protected by the spinlock 'lock'.
241 * Allocation offset for the block group to implement sequential
242 * allocation. This is used only on a zoned filesystem.
247 u64 meta_write_pointer;
248 struct btrfs_chunk_map *physical_map;
249 struct list_head active_bg_list;
250 struct work_struct zone_finish_work;
251 struct extent_buffer *last_eb;
252 enum btrfs_block_group_size_class size_class;
255 static inline u64 btrfs_block_group_end(struct btrfs_block_group *block_group)
257 return (block_group->start + block_group->length);
260 static inline bool btrfs_is_block_group_used(const struct btrfs_block_group *bg)
262 lockdep_assert_held(&bg->lock);
264 return (bg->used > 0 || bg->reserved > 0 || bg->pinned > 0);
267 static inline bool btrfs_is_block_group_data_only(
268 struct btrfs_block_group *block_group)
271 * In mixed mode the fragmentation is expected to be high, lowering the
272 * efficiency, so only proper data block groups are considered.
274 return (block_group->flags & BTRFS_BLOCK_GROUP_DATA) &&
275 !(block_group->flags & BTRFS_BLOCK_GROUP_METADATA);
278 #ifdef CONFIG_BTRFS_DEBUG
279 int btrfs_should_fragment_free_space(struct btrfs_block_group *block_group);
282 struct btrfs_block_group *btrfs_lookup_first_block_group(
283 struct btrfs_fs_info *info, u64 bytenr);
284 struct btrfs_block_group *btrfs_lookup_block_group(
285 struct btrfs_fs_info *info, u64 bytenr);
286 struct btrfs_block_group *btrfs_next_block_group(
287 struct btrfs_block_group *cache);
288 void btrfs_get_block_group(struct btrfs_block_group *cache);
289 void btrfs_put_block_group(struct btrfs_block_group *cache);
290 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
292 void btrfs_wait_block_group_reservations(struct btrfs_block_group *bg);
293 struct btrfs_block_group *btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info,
295 void btrfs_dec_nocow_writers(struct btrfs_block_group *bg);
296 void btrfs_wait_nocow_writers(struct btrfs_block_group *bg);
297 void btrfs_wait_block_group_cache_progress(struct btrfs_block_group *cache,
299 int btrfs_cache_block_group(struct btrfs_block_group *cache, bool wait);
300 void btrfs_put_caching_control(struct btrfs_caching_control *ctl);
301 struct btrfs_caching_control *btrfs_get_caching_control(
302 struct btrfs_block_group *cache);
303 int btrfs_add_new_free_space(struct btrfs_block_group *block_group,
304 u64 start, u64 end, u64 *total_added_ret);
305 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
306 struct btrfs_fs_info *fs_info,
307 const u64 chunk_offset);
308 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
309 struct btrfs_chunk_map *map);
310 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
311 void btrfs_mark_bg_unused(struct btrfs_block_group *bg);
312 void btrfs_reclaim_bgs_work(struct work_struct *work);
313 void btrfs_reclaim_bgs(struct btrfs_fs_info *fs_info);
314 void btrfs_mark_bg_to_reclaim(struct btrfs_block_group *bg);
315 int btrfs_read_block_groups(struct btrfs_fs_info *info);
316 struct btrfs_block_group *btrfs_make_block_group(struct btrfs_trans_handle *trans,
318 u64 chunk_offset, u64 size);
319 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans);
320 int btrfs_inc_block_group_ro(struct btrfs_block_group *cache,
321 bool do_chunk_alloc);
322 void btrfs_dec_block_group_ro(struct btrfs_block_group *cache);
323 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
324 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans);
325 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans);
326 int btrfs_update_block_group(struct btrfs_trans_handle *trans,
327 u64 bytenr, u64 num_bytes, bool alloc);
328 int btrfs_add_reserved_bytes(struct btrfs_block_group *cache,
329 u64 ram_bytes, u64 num_bytes, int delalloc,
330 bool force_wrong_size_class);
331 void btrfs_free_reserved_bytes(struct btrfs_block_group *cache,
332 u64 num_bytes, int delalloc);
333 int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags,
334 enum btrfs_chunk_alloc_enum force);
335 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type);
336 void check_system_chunk(struct btrfs_trans_handle *trans, const u64 type);
337 void btrfs_reserve_chunk_metadata(struct btrfs_trans_handle *trans,
338 bool is_item_insertion);
339 u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags);
340 void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
341 int btrfs_free_block_groups(struct btrfs_fs_info *info);
342 int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
343 u64 physical, u64 **logical, int *naddrs, int *stripe_len);
345 static inline u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info)
347 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_DATA);
350 static inline u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info)
352 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_METADATA);
355 static inline u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info)
357 return btrfs_get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
360 static inline int btrfs_block_group_done(struct btrfs_block_group *cache)
363 return cache->cached == BTRFS_CACHE_FINISHED ||
364 cache->cached == BTRFS_CACHE_ERROR;
367 void btrfs_freeze_block_group(struct btrfs_block_group *cache);
368 void btrfs_unfreeze_block_group(struct btrfs_block_group *cache);
370 bool btrfs_inc_block_group_swap_extents(struct btrfs_block_group *bg);
371 void btrfs_dec_block_group_swap_extents(struct btrfs_block_group *bg, int amount);
373 enum btrfs_block_group_size_class btrfs_calc_block_group_size_class(u64 size);
374 int btrfs_use_block_group_size_class(struct btrfs_block_group *bg,
375 enum btrfs_block_group_size_class size_class,
376 bool force_wrong_size_class);
377 bool btrfs_block_group_should_use_size_class(struct btrfs_block_group *bg);
379 #endif /* BTRFS_BLOCK_GROUP_H */