1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef BTRFS_SPACE_INFO_H
4 #define BTRFS_SPACE_INFO_H
5
6 struct btrfs_space_info {
7 spinlock_t lock;
8
9 u64 total_bytes; /* total bytes in the space,
10 this doesn't take mirrors into account */
11 u64 bytes_used; /* total bytes used,
12 this doesn't take mirrors into account */
13 u64 bytes_pinned; /* total bytes pinned, will be freed when the
14 transaction finishes */
15 u64 bytes_reserved; /* total bytes the allocator has reserved for
16 current allocations */
17 u64 bytes_may_use; /* number of bytes that may be used for
18 delalloc/allocations */
19 u64 bytes_readonly; /* total bytes that are read only */
20
21 u64 max_extent_size; /* This will hold the maximum extent size of
22 the space info if we had an ENOSPC in the
23 allocator. */
24
25 unsigned int full:1; /* indicates that we cannot allocate any more
26 chunks for this space */
27 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
28
29 unsigned int flush:1; /* set if we are trying to make space */
30
31 unsigned int force_alloc; /* set if we need to force a chunk
32 alloc for this space */
33
34 u64 disk_used; /* total bytes used on disk */
35 u64 disk_total; /* total bytes on disk, takes mirrors into
36 account */
37
38 u64 flags;
39
40 /*
41 * bytes_pinned is kept in line with what is actually pinned, as in
42 * we've called update_block_group and dropped the bytes_used counter
43 * and increased the bytes_pinned counter. However this means that
44 * bytes_pinned does not reflect the bytes that will be pinned once the
45 * delayed refs are flushed, so this counter is inc'ed every time we
46 * call btrfs_free_extent so it is a realtime count of what will be
47 * freed once the transaction is committed. It will be zeroed every
48 * time the transaction commits.
49 */
50 struct percpu_counter total_bytes_pinned;
51
52 struct list_head list;
53 /* Protected by the spinlock 'lock'. */
54 struct list_head ro_bgs;
55 struct list_head priority_tickets;
56 struct list_head tickets;
57
58 /*
59 * Size of space that needs to be reclaimed in order to satisfy pending
60 * tickets
61 */
62 u64 reclaim_size;
63
64 /*
65 * tickets_id just indicates the next ticket will be handled, so note
66 * it's not stored per ticket.
67 */
68 u64 tickets_id;
69
70 struct rw_semaphore groups_sem;
71 /* for block groups in our same type */
72 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
73
74 struct kobject kobj;
75 struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
76 };
77
78 struct reserve_ticket {
79 u64 bytes;
80 int error;
81 bool steal;
82 struct list_head list;
83 wait_queue_head_t wait;
84 };
85
btrfs_mixed_space_info(struct btrfs_space_info * space_info)86 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
87 {
88 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
89 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
90 }
91
92 /*
93 *
94 * Declare a helper function to detect underflow of various space info members
95 */
96 #define DECLARE_SPACE_INFO_UPDATE(name, trace_name) \
97 static inline void \
98 btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info, \
99 struct btrfs_space_info *sinfo, \
100 s64 bytes) \
101 { \
102 const u64 abs_bytes = (bytes < 0) ? -bytes : bytes; \
103 lockdep_assert_held(&sinfo->lock); \
104 trace_update_##name(fs_info, sinfo, sinfo->name, bytes); \
105 trace_btrfs_space_reservation(fs_info, trace_name, \
106 sinfo->flags, abs_bytes, \
107 bytes > 0); \
108 if (bytes < 0 && sinfo->name < -bytes) { \
109 WARN_ON(1); \
110 sinfo->name = 0; \
111 return; \
112 } \
113 sinfo->name += bytes; \
114 }
115
116 DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info");
117 DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned");
118
119 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
120 void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
121 u64 total_bytes, u64 bytes_used,
122 u64 bytes_readonly,
123 struct btrfs_space_info **space_info);
124 struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
125 u64 flags);
126 u64 __pure btrfs_space_info_used(struct btrfs_space_info *s_info,
127 bool may_use_included);
128 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
129 void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
130 struct btrfs_space_info *info, u64 bytes,
131 int dump_block_groups);
132 int btrfs_reserve_metadata_bytes(struct btrfs_root *root,
133 struct btrfs_block_rsv *block_rsv,
134 u64 orig_bytes,
135 enum btrfs_reserve_flush_enum flush);
136 void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info,
137 struct btrfs_space_info *space_info);
138 int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
139 struct btrfs_space_info *space_info, u64 bytes,
140 enum btrfs_reserve_flush_enum flush);
141
btrfs_space_info_free_bytes_may_use(struct btrfs_fs_info * fs_info,struct btrfs_space_info * space_info,u64 num_bytes)142 static inline void btrfs_space_info_free_bytes_may_use(
143 struct btrfs_fs_info *fs_info,
144 struct btrfs_space_info *space_info,
145 u64 num_bytes)
146 {
147 spin_lock(&space_info->lock);
148 btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes);
149 btrfs_try_granting_tickets(fs_info, space_info);
150 spin_unlock(&space_info->lock);
151 }
152 int btrfs_reserve_data_bytes(struct btrfs_fs_info *fs_info, u64 bytes,
153 enum btrfs_reserve_flush_enum flush);
154
155 #endif /* BTRFS_SPACE_INFO_H */
156
