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aac0023c JB |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | ||
3 | #ifndef BTRFS_BLOCK_GROUP_H | |
4 | #define BTRFS_BLOCK_GROUP_H | |
5 | ||
67b61aef DS |
6 | #include "free-space-cache.h" |
7 | ||
aac0023c JB |
8 | enum btrfs_disk_cache_state { |
9 | BTRFS_DC_WRITTEN, | |
10 | BTRFS_DC_ERROR, | |
11 | BTRFS_DC_CLEAR, | |
12 | BTRFS_DC_SETUP, | |
13 | }; | |
14 | ||
07730d87 JB |
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 | ||
aac0023c JB |
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 | ||
2e405ad8 JB |
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); | |
3cad1284 JB |
179 | void btrfs_get_block_group(struct btrfs_block_group_cache *cache); |
180 | void btrfs_put_block_group(struct btrfs_block_group_cache *cache); | |
3eeb3226 JB |
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); | |
676f1f75 JB |
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); | |
e3cb339f JB |
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); | |
9f21246d JB |
195 | u64 add_new_free_space(struct btrfs_block_group_cache *block_group, |
196 | u64 start, u64 end); | |
e3e0520b JB |
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); | |
4358d963 JB |
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); | |
26ce2095 JB |
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); | |
77745c05 JB |
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); | |
ade4b516 JB |
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); | |
07730d87 JB |
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); | |
878d7b67 | 223 | u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags); |
3e43c279 JB |
224 | void btrfs_put_block_group_cache(struct btrfs_fs_info *info); |
225 | int btrfs_free_block_groups(struct btrfs_fs_info *info); | |
878d7b67 JB |
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 | } | |
676f1f75 JB |
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 | } | |
2e405ad8 | 249 | |
aac0023c | 250 | #endif /* BTRFS_BLOCK_GROUP_H */ |