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 #define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \
49 EXTENT_CLEAR_DATA_RESV)
50 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | \
51 EXTENT_ADD_INODE_BYTES | \
52 EXTENT_CLEAR_ALL_BITS)
53
54 /*
55 * Redefined bits above which are used only in the device allocation tree,
56 * shouldn't be using EXTENT_LOCKED / EXTENT_BOUNDARY / EXTENT_CLEAR_META_RESV
57 * / EXTENT_CLEAR_DATA_RESV because they have special meaning to the bit
58 * manipulation functions
59 */
60 #define CHUNK_ALLOCATED EXTENT_DIRTY
61 #define CHUNK_TRIMMED EXTENT_DEFRAG
62 #define CHUNK_STATE_MASK (CHUNK_ALLOCATED | \
63 CHUNK_TRIMMED)
64
65 enum {
66 IO_TREE_FS_PINNED_EXTENTS,
67 IO_TREE_FS_EXCLUDED_EXTENTS,
68 IO_TREE_BTREE_INODE_IO,
69 IO_TREE_INODE_IO,
70 IO_TREE_RELOC_BLOCKS,
71 IO_TREE_TRANS_DIRTY_PAGES,
72 IO_TREE_ROOT_DIRTY_LOG_PAGES,
73 IO_TREE_INODE_FILE_EXTENT,
74 IO_TREE_LOG_CSUM_RANGE,
75 IO_TREE_SELFTEST,
76 IO_TREE_DEVICE_ALLOC_STATE,
77 };
78
79 struct extent_io_tree {
80 struct rb_root state;
81 struct btrfs_fs_info *fs_info;
82 /* Inode associated with this tree, or NULL. */
83 struct btrfs_inode *inode;
84
85 /* Who owns this io tree, should be one of IO_TREE_* */
86 u8 owner;
87
88 spinlock_t lock;
89 };
90
91 struct extent_state {
92 u64 start;
93 u64 end; /* inclusive */
94 struct rb_node rb_node;
95
96 /* ADD NEW ELEMENTS AFTER THIS */
97 wait_queue_head_t wq;
98 refcount_t refs;
99 u32 state;
100
101 #ifdef CONFIG_BTRFS_DEBUG
102 struct list_head leak_list;
103 #endif
104 };
105
106 void extent_io_tree_init(struct btrfs_fs_info *fs_info,
107 struct extent_io_tree *tree, unsigned int owner);
108 void extent_io_tree_release(struct extent_io_tree *tree);
109
110 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
111 struct extent_state **cached);
112
113 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
114 struct extent_state **cached);
115
116 int __init extent_state_init_cachep(void);
117 void __cold extent_state_free_cachep(void);
118
119 u64 count_range_bits(struct extent_io_tree *tree,
120 u64 *start, u64 search_end,
121 u64 max_bytes, u32 bits, int contig,
122 struct extent_state **cached_state);
123
124 void free_extent_state(struct extent_state *state);
125 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
126 u32 bits, int filled, struct extent_state *cached_state);
127 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
128 u32 bits, struct extent_changeset *changeset);
129 int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
130 u32 bits, struct extent_state **cached, gfp_t mask,
131 struct extent_changeset *changeset);
132
clear_extent_bit(struct extent_io_tree * tree,u64 start,u64 end,u32 bits,struct extent_state ** cached)133 static inline int clear_extent_bit(struct extent_io_tree *tree, u64 start,
134 u64 end, u32 bits,
135 struct extent_state **cached)
136 {
137 return __clear_extent_bit(tree, start, end, bits, cached,
138 GFP_NOFS, NULL);
139 }
140
unlock_extent(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)141 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
142 struct extent_state **cached)
143 {
144 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached,
145 GFP_NOFS, NULL);
146 }
147
clear_extent_bits(struct extent_io_tree * tree,u64 start,u64 end,u32 bits)148 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
149 u64 end, u32 bits)
150 {
151 return clear_extent_bit(tree, start, end, bits, NULL);
152 }
153
154 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
155 u32 bits, struct extent_changeset *changeset);
156 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
157 u32 bits, struct extent_state **cached_state, gfp_t mask);
158
set_extent_bits_nowait(struct extent_io_tree * tree,u64 start,u64 end,u32 bits)159 static inline int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start,
160 u64 end, u32 bits)
161 {
162 return set_extent_bit(tree, start, end, bits, NULL, GFP_NOWAIT);
163 }
164
set_extent_bits(struct extent_io_tree * tree,u64 start,u64 end,u32 bits)165 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
166 u64 end, u32 bits)
167 {
168 return set_extent_bit(tree, start, end, bits, NULL, GFP_NOFS);
169 }
170
clear_extent_uptodate(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state)171 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
172 u64 end, struct extent_state **cached_state)
173 {
174 return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE,
175 cached_state, GFP_NOFS, NULL);
176 }
177
set_extent_dirty(struct extent_io_tree * tree,u64 start,u64 end,gfp_t mask)178 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
179 u64 end, gfp_t mask)
180 {
181 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, mask);
182 }
183
clear_extent_dirty(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)184 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
185 u64 end, struct extent_state **cached)
186 {
187 return clear_extent_bit(tree, start, end,
188 EXTENT_DIRTY | EXTENT_DELALLOC |
189 EXTENT_DO_ACCOUNTING, cached);
190 }
191
192 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
193 u32 bits, u32 clear_bits,
194 struct extent_state **cached_state);
195
set_extent_delalloc(struct extent_io_tree * tree,u64 start,u64 end,u32 extra_bits,struct extent_state ** cached_state)196 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
197 u64 end, u32 extra_bits,
198 struct extent_state **cached_state)
199 {
200 return set_extent_bit(tree, start, end,
201 EXTENT_DELALLOC | extra_bits,
202 cached_state, GFP_NOFS);
203 }
204
set_extent_defrag(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state)205 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
206 u64 end, struct extent_state **cached_state)
207 {
208 return set_extent_bit(tree, start, end,
209 EXTENT_DELALLOC | EXTENT_DEFRAG,
210 cached_state, GFP_NOFS);
211 }
212
set_extent_new(struct extent_io_tree * tree,u64 start,u64 end)213 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
214 u64 end)
215 {
216 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, GFP_NOFS);
217 }
218
219 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
220 u64 *start_ret, u64 *end_ret, u32 bits,
221 struct extent_state **cached_state);
222 void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
223 u64 *start_ret, u64 *end_ret, u32 bits);
224 int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start,
225 u64 *start_ret, u64 *end_ret, u32 bits);
226 bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
227 u64 *end, u64 max_bytes,
228 struct extent_state **cached_state);
229 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits,
230 struct extent_state **cached_state);
231
232 #endif /* BTRFS_EXTENT_IO_TREE_H */
233