Line data Source code
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 :
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 0 : return __clear_extent_bit(tree, start, end, bits, cached, NULL);
147 : }
148 :
149 : static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
150 : struct extent_state **cached)
151 : {
152 0 : return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached, NULL);
153 : }
154 :
155 : static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
156 : u64 end, u32 bits)
157 : {
158 0 : 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 :
166 : static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
167 : u64 end, struct extent_state **cached_state)
168 : {
169 0 : return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE,
170 : cached_state, NULL);
171 : }
172 :
173 : static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
174 : u64 end, struct extent_state **cached)
175 : {
176 0 : 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 : int 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 */
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