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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 	 * tickets_id just indicates the next ticket will be handled, so note
59 	 * it's not stored per ticket.
60 	 */
61 	u64 tickets_id;
62 
63 	struct rw_semaphore groups_sem;
64 	/* for block groups in our same type */
65 	struct list_head block_groups[BTRFS_NR_RAID_TYPES];
66 	wait_queue_head_t wait;
67 
68 	struct kobject kobj;
69 	struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
70 };
71 
72 struct reserve_ticket {
73 	u64 bytes;
74 	int error;
75 	bool steal;
76 	struct list_head list;
77 	wait_queue_head_t wait;
78 };
79 
btrfs_mixed_space_info(struct btrfs_space_info * space_info)80 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
81 {
82 	return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
83 		(space_info->flags & BTRFS_BLOCK_GROUP_DATA));
84 }
85 
86 /*
87  *
88  * Declare a helper function to detect underflow of various space info members
89  */
90 #define DECLARE_SPACE_INFO_UPDATE(name, trace_name)			\
91 static inline void							\
92 btrfs_space_info_update_##name(struct btrfs_fs_info *fs_info,		\
93 			       struct btrfs_space_info *sinfo,		\
94 			       s64 bytes)				\
95 {									\
96 	const u64 abs_bytes = (bytes < 0) ? -bytes : bytes;		\
97 	lockdep_assert_held(&sinfo->lock);				\
98 	trace_update_##name(fs_info, sinfo, sinfo->name, bytes);	\
99 	trace_btrfs_space_reservation(fs_info, trace_name,		\
100 				      sinfo->flags, abs_bytes,		\
101 				      bytes > 0);			\
102 	if (bytes < 0 && sinfo->name < -bytes) {			\
103 		WARN_ON(1);						\
104 		sinfo->name = 0;					\
105 		return;							\
106 	}								\
107 	sinfo->name += bytes;						\
108 }
109 
110 DECLARE_SPACE_INFO_UPDATE(bytes_may_use, "space_info");
111 DECLARE_SPACE_INFO_UPDATE(bytes_pinned, "pinned");
112 
113 int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
114 void btrfs_update_space_info(struct btrfs_fs_info *info, u64 flags,
115 			     u64 total_bytes, u64 bytes_used,
116 			     u64 bytes_readonly,
117 			     struct btrfs_space_info **space_info);
118 struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
119 					       u64 flags);
120 u64 btrfs_space_info_used(struct btrfs_space_info *s_info,
121 			  bool may_use_included);
122 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
123 void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
124 			   struct btrfs_space_info *info, u64 bytes,
125 			   int dump_block_groups);
126 int btrfs_reserve_metadata_bytes(struct btrfs_root *root,
127 				 struct btrfs_block_rsv *block_rsv,
128 				 u64 orig_bytes,
129 				 enum btrfs_reserve_flush_enum flush);
130 void btrfs_try_granting_tickets(struct btrfs_fs_info *fs_info,
131 				struct btrfs_space_info *space_info);
132 int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
133 			 struct btrfs_space_info *space_info, u64 bytes,
134 			 enum btrfs_reserve_flush_enum flush);
135 
btrfs_space_info_free_bytes_may_use(struct btrfs_fs_info * fs_info,struct btrfs_space_info * space_info,u64 num_bytes)136 static inline void btrfs_space_info_free_bytes_may_use(
137 				struct btrfs_fs_info *fs_info,
138 				struct btrfs_space_info *space_info,
139 				u64 num_bytes)
140 {
141 	spin_lock(&space_info->lock);
142 	btrfs_space_info_update_bytes_may_use(fs_info, space_info, -num_bytes);
143 	btrfs_try_granting_tickets(fs_info, space_info);
144 	spin_unlock(&space_info->lock);
145 }
146 
147 #endif /* BTRFS_SPACE_INFO_H */
148