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 enum btrfs_disk_cache_state
{
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.
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
24 * CHUNK_ALLOC_FORCE means it must try to allocate one
26 enum btrfs_chunk_alloc_enum
{
32 struct btrfs_caching_control
{
33 struct list_head list
;
35 wait_queue_head_t wait
;
36 struct btrfs_work work
;
37 struct btrfs_block_group_cache
*block_group
;
42 /* Once caching_thread() finds this much free space, it will wake up waiters. */
43 #define CACHING_CTL_WAKE_UP SZ_2M
45 struct btrfs_block_group_cache
{
47 struct btrfs_block_group_item item
;
48 struct btrfs_fs_info
*fs_info
;
59 * If the free space extent count exceeds this number, convert the block
62 u32 bitmap_high_thresh
;
65 * If the free space extent count drops below this number, convert the
66 * block group back to extents.
68 u32 bitmap_low_thresh
;
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.
75 struct rw_semaphore data_rwsem
;
77 /* For raid56, this is a full stripe, without parity */
78 unsigned long full_stripe_len
;
82 unsigned int has_caching_ctl
:1;
83 unsigned int removed
:1;
87 /* Cache tracking stuff */
89 struct btrfs_caching_control
*caching_ctl
;
90 u64 last_byte_to_unpin
;
92 struct btrfs_space_info
*space_info
;
94 /* Free space cache stuff */
95 struct btrfs_free_space_ctl
*free_space_ctl
;
97 /* Block group cache stuff */
98 struct rb_node cache_node
;
100 /* For block groups in the same raid type */
101 struct list_head list
;
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
110 struct list_head cluster_list
;
112 /* For delayed block group creation or deletion of empty block groups */
113 struct list_head bg_list
;
115 /* For read-only block groups */
116 struct list_head ro_list
;
120 /* For dirty block groups */
121 struct list_head dirty_list
;
122 struct list_head io_list
;
124 struct btrfs_io_ctl io_ctl
;
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).
135 atomic_t reservations
;
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.
145 atomic_t nocow_writers
;
147 /* Lock for free space tree operations. */
148 struct mutex free_space_lock
;
151 * Does the block group need to be added to the free space tree?
152 * Protected by free_space_lock.
154 int needs_free_space
;
156 /* Record locked full stripes for RAID5/6 block group */
157 struct btrfs_full_stripe_locks_tree full_stripe_locks_root
;
160 #ifdef CONFIG_BTRFS_DEBUG
161 static inline int btrfs_should_fragment_free_space(
162 struct btrfs_block_group_cache
*block_group
)
164 struct btrfs_fs_info
*fs_info
= block_group
->fs_info
;
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
);
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
,
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
,
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
,
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
);
227 static inline u64
btrfs_data_alloc_profile(struct btrfs_fs_info
*fs_info
)
229 return btrfs_get_alloc_profile(fs_info
, BTRFS_BLOCK_GROUP_DATA
);
232 static inline u64
btrfs_metadata_alloc_profile(struct btrfs_fs_info
*fs_info
)
234 return btrfs_get_alloc_profile(fs_info
, BTRFS_BLOCK_GROUP_METADATA
);
237 static inline u64
btrfs_system_alloc_profile(struct btrfs_fs_info
*fs_info
)
239 return btrfs_get_alloc_profile(fs_info
, BTRFS_BLOCK_GROUP_SYSTEM
);
242 static inline int btrfs_block_group_cache_done(
243 struct btrfs_block_group_cache
*cache
)
246 return cache
->cached
== BTRFS_CACHE_FINISHED
||
247 cache
->cached
== BTRFS_CACHE_ERROR
;
250 #endif /* BTRFS_BLOCK_GROUP_H */