1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef BTRFS_EXTENT_IO_TREE_H
4 #define BTRFS_EXTENT_IO_TREE_H
5
6 #include "misc.h"
7
8 struct extent_changeset;
9
10 /* Bits for the extent state */
11 enum {
12 ENUM_BIT(EXTENT_DIRTY),
13 ENUM_BIT(EXTENT_UPTODATE),
14 ENUM_BIT(EXTENT_LOCKED),
15 ENUM_BIT(EXTENT_NEW),
16 ENUM_BIT(EXTENT_DELALLOC),
17 ENUM_BIT(EXTENT_DEFRAG),
18 ENUM_BIT(EXTENT_BOUNDARY),
19 ENUM_BIT(EXTENT_NODATASUM),
20 ENUM_BIT(EXTENT_CLEAR_META_RESV),
21 ENUM_BIT(EXTENT_NEED_WAIT),
22 ENUM_BIT(EXTENT_NORESERVE),
23 ENUM_BIT(EXTENT_QGROUP_RESERVED),
24 ENUM_BIT(EXTENT_CLEAR_DATA_RESV),
25 /*
26 * Must be cleared only during ordered extent completion or on error
27 * paths if we did not manage to submit bios and create the ordered
28 * extents for the range. Should not be cleared during page release
29 * and page invalidation (if there is an ordered extent in flight),
30 * that is left for the ordered extent completion.
31 */
32 ENUM_BIT(EXTENT_DELALLOC_NEW),
33 /*
34 * When an ordered extent successfully completes for a region marked as
35 * a new delalloc range, use this flag when clearing a new delalloc
36 * range to indicate that the VFS' inode number of bytes should be
37 * incremented and the inode's new delalloc bytes decremented, in an
38 * atomic way to prevent races with stat(2).
39 */
40 ENUM_BIT(EXTENT_ADD_INODE_BYTES),
41 /*
42 * Set during truncate when we're clearing an entire range and we just
43 * want the extent states to go away.
44 */
45 ENUM_BIT(EXTENT_CLEAR_ALL_BITS),
46
47 /*
48 * This must be last.
49 *
50 * Bit not representing a state but a request for NOWAIT semantics,
51 * e.g. when allocating memory, and must be masked out from the other
52 * bits.
53 */
54 ENUM_BIT(EXTENT_NOWAIT)
55 };
56
57 #define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \
58 EXTENT_CLEAR_DATA_RESV)
59 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | \
60 EXTENT_ADD_INODE_BYTES | \
61 EXTENT_CLEAR_ALL_BITS)
62
63 /*
64 * Redefined bits above which are used only in the device allocation tree,
65 * shouldn't be using EXTENT_LOCKED / EXTENT_BOUNDARY / EXTENT_CLEAR_META_RESV
66 * / EXTENT_CLEAR_DATA_RESV because they have special meaning to the bit
67 * manipulation functions
68 */
69 #define CHUNK_ALLOCATED EXTENT_DIRTY
70 #define CHUNK_TRIMMED EXTENT_DEFRAG
71 #define CHUNK_STATE_MASK (CHUNK_ALLOCATED | \
72 CHUNK_TRIMMED)
73
74 enum {
75 IO_TREE_FS_PINNED_EXTENTS,
76 IO_TREE_FS_EXCLUDED_EXTENTS,
77 IO_TREE_BTREE_INODE_IO,
78 IO_TREE_INODE_IO,
79 IO_TREE_RELOC_BLOCKS,
80 IO_TREE_TRANS_DIRTY_PAGES,
81 IO_TREE_ROOT_DIRTY_LOG_PAGES,
82 IO_TREE_INODE_FILE_EXTENT,
83 IO_TREE_LOG_CSUM_RANGE,
84 IO_TREE_SELFTEST,
85 IO_TREE_DEVICE_ALLOC_STATE,
86 };
87
88 struct extent_io_tree {
89 struct rb_root state;
90 struct btrfs_fs_info *fs_info;
91 /* Inode associated with this tree, or NULL. */
92 struct btrfs_inode *inode;
93
94 /* Who owns this io tree, should be one of IO_TREE_* */
95 u8 owner;
96
97 spinlock_t lock;
98 };
99
100 struct extent_state {
101 u64 start;
102 u64 end; /* inclusive */
103 struct rb_node rb_node;
104
105 /* ADD NEW ELEMENTS AFTER THIS */
106 wait_queue_head_t wq;
107 refcount_t refs;
108 u32 state;
109
110 #ifdef CONFIG_BTRFS_DEBUG
111 struct list_head leak_list;
112 #endif
113 };
114
115 void extent_io_tree_init(struct btrfs_fs_info *fs_info,
116 struct extent_io_tree *tree, unsigned int owner);
117 void extent_io_tree_release(struct extent_io_tree *tree);
118
119 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
120 struct extent_state **cached);
121
122 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
123 struct extent_state **cached);
124
125 int __init extent_state_init_cachep(void);
126 void __cold extent_state_free_cachep(void);
127
128 u64 count_range_bits(struct extent_io_tree *tree,
129 u64 *start, u64 search_end,
130 u64 max_bytes, u32 bits, int contig,
131 struct extent_state **cached_state);
132
133 void free_extent_state(struct extent_state *state);
134 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
135 u32 bits, int filled, struct extent_state *cached_state);
136 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
137 u32 bits, struct extent_changeset *changeset);
138 int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
139 u32 bits, struct extent_state **cached,
140 struct extent_changeset *changeset);
141
clear_extent_bit(struct extent_io_tree * tree,u64 start,u64 end,u32 bits,struct extent_state ** cached)142 static inline int clear_extent_bit(struct extent_io_tree *tree, u64 start,
143 u64 end, u32 bits,
144 struct extent_state **cached)
145 {
146 return __clear_extent_bit(tree, start, end, bits, cached, NULL);
147 }
148
unlock_extent(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)149 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
150 struct extent_state **cached)
151 {
152 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached, NULL);
153 }
154
clear_extent_bits(struct extent_io_tree * tree,u64 start,u64 end,u32 bits)155 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
156 u64 end, u32 bits)
157 {
158 return clear_extent_bit(tree, start, end, bits, NULL);
159 }
160
161 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
162 u32 bits, struct extent_changeset *changeset);
163 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
164 u32 bits, struct extent_state **cached_state);
165
clear_extent_uptodate(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state)166 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
167 u64 end, struct extent_state **cached_state)
168 {
169 return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE,
170 cached_state, NULL);
171 }
172
clear_extent_dirty(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)173 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
174 u64 end, struct extent_state **cached)
175 {
176 return clear_extent_bit(tree, start, end,
177 EXTENT_DIRTY | EXTENT_DELALLOC |
178 EXTENT_DO_ACCOUNTING, cached);
179 }
180
181 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
182 u32 bits, u32 clear_bits,
183 struct extent_state **cached_state);
184
185 bool find_first_extent_bit(struct extent_io_tree *tree, u64 start,
186 u64 *start_ret, u64 *end_ret, u32 bits,
187 struct extent_state **cached_state);
188 void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
189 u64 *start_ret, u64 *end_ret, u32 bits);
190 int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start,
191 u64 *start_ret, u64 *end_ret, u32 bits);
192 bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
193 u64 *end, u64 max_bytes,
194 struct extent_state **cached_state);
195 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits,
196 struct extent_state **cached_state);
197
198 #endif /* BTRFS_EXTENT_IO_TREE_H */
199
