1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #ifndef BTRFS_EXTENT_IO_TREE_H
4 #define BTRFS_EXTENT_IO_TREE_H
5 
6 struct extent_changeset;
7 struct io_failure_record;
8 
9 /* Bits for the extent state */
10 #define EXTENT_DIRTY		(1U << 0)
11 #define EXTENT_UPTODATE		(1U << 1)
12 #define EXTENT_LOCKED		(1U << 2)
13 #define EXTENT_NEW		(1U << 3)
14 #define EXTENT_DELALLOC		(1U << 4)
15 #define EXTENT_DEFRAG		(1U << 5)
16 #define EXTENT_BOUNDARY		(1U << 6)
17 #define EXTENT_NODATASUM	(1U << 7)
18 #define EXTENT_CLEAR_META_RESV	(1U << 8)
19 #define EXTENT_NEED_WAIT	(1U << 9)
20 #define EXTENT_NORESERVE	(1U << 11)
21 #define EXTENT_QGROUP_RESERVED	(1U << 12)
22 #define EXTENT_CLEAR_DATA_RESV	(1U << 13)
23 /*
24  * Must be cleared only during ordered extent completion or on error paths if we
25  * did not manage to submit bios and create the ordered extents for the range.
26  * Should not be cleared during page release and page invalidation (if there is
27  * an ordered extent in flight), that is left for the ordered extent completion.
28  */
29 #define EXTENT_DELALLOC_NEW	(1U << 14)
30 /*
31  * When an ordered extent successfully completes for a region marked as a new
32  * delalloc range, use this flag when clearing a new delalloc range to indicate
33  * that the VFS' inode number of bytes should be incremented and the inode's new
34  * delalloc bytes decremented, in an atomic way to prevent races with stat(2).
35  */
36 #define EXTENT_ADD_INODE_BYTES  (1U << 15)
37 
38 /*
39  * Set during truncate when we're clearing an entire range and we just want the
40  * extent states to go away.
41  */
42 #define EXTENT_CLEAR_ALL_BITS	(1U << 16)
43 
44 #define EXTENT_DO_ACCOUNTING    (EXTENT_CLEAR_META_RESV | \
45 				 EXTENT_CLEAR_DATA_RESV)
46 #define EXTENT_CTLBITS		(EXTENT_DO_ACCOUNTING | \
47 				 EXTENT_ADD_INODE_BYTES | \
48 				 EXTENT_CLEAR_ALL_BITS)
49 
50 /*
51  * Redefined bits above which are used only in the device allocation tree,
52  * shouldn't be using EXTENT_LOCKED / EXTENT_BOUNDARY / EXTENT_CLEAR_META_RESV
53  * / EXTENT_CLEAR_DATA_RESV because they have special meaning to the bit
54  * manipulation functions
55  */
56 #define CHUNK_ALLOCATED				EXTENT_DIRTY
57 #define CHUNK_TRIMMED				EXTENT_DEFRAG
58 #define CHUNK_STATE_MASK			(CHUNK_ALLOCATED |		\
59 						 CHUNK_TRIMMED)
60 
61 enum {
62 	IO_TREE_FS_PINNED_EXTENTS,
63 	IO_TREE_FS_EXCLUDED_EXTENTS,
64 	IO_TREE_BTREE_INODE_IO,
65 	IO_TREE_INODE_IO,
66 	IO_TREE_RELOC_BLOCKS,
67 	IO_TREE_TRANS_DIRTY_PAGES,
68 	IO_TREE_ROOT_DIRTY_LOG_PAGES,
69 	IO_TREE_INODE_FILE_EXTENT,
70 	IO_TREE_LOG_CSUM_RANGE,
71 	IO_TREE_SELFTEST,
72 	IO_TREE_DEVICE_ALLOC_STATE,
73 };
74 
75 struct extent_io_tree {
76 	struct rb_root state;
77 	struct btrfs_fs_info *fs_info;
78 	void *private_data;
79 
80 	/* Who owns this io tree, should be one of IO_TREE_* */
81 	u8 owner;
82 
83 	spinlock_t lock;
84 };
85 
86 struct extent_state {
87 	u64 start;
88 	u64 end; /* inclusive */
89 	struct rb_node rb_node;
90 
91 	/* ADD NEW ELEMENTS AFTER THIS */
92 	wait_queue_head_t wq;
93 	refcount_t refs;
94 	u32 state;
95 
96 #ifdef CONFIG_BTRFS_DEBUG
97 	struct list_head leak_list;
98 #endif
99 };
100 
101 void extent_io_tree_init(struct btrfs_fs_info *fs_info,
102 			 struct extent_io_tree *tree, unsigned int owner,
103 			 void *private_data);
104 void extent_io_tree_release(struct extent_io_tree *tree);
105 
106 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
107 		struct extent_state **cached);
108 
109 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
110 
111 int __init extent_state_init_cachep(void);
112 void __cold extent_state_free_cachep(void);
113 
114 u64 count_range_bits(struct extent_io_tree *tree,
115 		     u64 *start, u64 search_end,
116 		     u64 max_bytes, u32 bits, int contig);
117 
118 void free_extent_state(struct extent_state *state);
119 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
120 		   u32 bits, int filled, struct extent_state *cached_state);
121 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
122 			     u32 bits, struct extent_changeset *changeset);
123 int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
124 		       u32 bits, struct extent_state **cached, gfp_t mask,
125 		       struct extent_changeset *changeset);
126 
clear_extent_bit(struct extent_io_tree * tree,u64 start,u64 end,u32 bits,struct extent_state ** cached)127 static inline int clear_extent_bit(struct extent_io_tree *tree, u64 start,
128 				   u64 end, u32 bits,
129 				   struct extent_state **cached)
130 {
131 	return __clear_extent_bit(tree, start, end, bits, cached,
132 				  GFP_NOFS, NULL);
133 }
134 
unlock_extent(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)135 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
136 				struct extent_state **cached)
137 {
138 	return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached,
139 				  GFP_NOFS, NULL);
140 }
141 
unlock_extent_atomic(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)142 static inline int unlock_extent_atomic(struct extent_io_tree *tree, u64 start,
143 				       u64 end, struct extent_state **cached)
144 {
145 	return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached,
146 				  GFP_ATOMIC, NULL);
147 }
148 
clear_extent_bits(struct extent_io_tree * tree,u64 start,u64 end,u32 bits)149 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
150 				    u64 end, u32 bits)
151 {
152 	return clear_extent_bit(tree, start, end, bits, NULL);
153 }
154 
155 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
156 			   u32 bits, struct extent_changeset *changeset);
157 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
158 		   u32 bits, struct extent_state **cached_state, gfp_t mask);
159 
set_extent_bits_nowait(struct extent_io_tree * tree,u64 start,u64 end,u32 bits)160 static inline int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start,
161 					 u64 end, u32 bits)
162 {
163 	return set_extent_bit(tree, start, end, bits, NULL, GFP_NOWAIT);
164 }
165 
set_extent_bits(struct extent_io_tree * tree,u64 start,u64 end,u32 bits)166 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
167 		u64 end, u32 bits)
168 {
169 	return set_extent_bit(tree, start, end, bits, NULL, GFP_NOFS);
170 }
171 
clear_extent_uptodate(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state)172 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
173 		u64 end, struct extent_state **cached_state)
174 {
175 	return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE,
176 				  cached_state, GFP_NOFS, NULL);
177 }
178 
set_extent_dirty(struct extent_io_tree * tree,u64 start,u64 end,gfp_t mask)179 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
180 		u64 end, gfp_t mask)
181 {
182 	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, mask);
183 }
184 
clear_extent_dirty(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached)185 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
186 				     u64 end, struct extent_state **cached)
187 {
188 	return clear_extent_bit(tree, start, end,
189 				EXTENT_DIRTY | EXTENT_DELALLOC |
190 				EXTENT_DO_ACCOUNTING, cached);
191 }
192 
193 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
194 		       u32 bits, u32 clear_bits,
195 		       struct extent_state **cached_state);
196 
set_extent_delalloc(struct extent_io_tree * tree,u64 start,u64 end,u32 extra_bits,struct extent_state ** cached_state)197 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
198 				      u64 end, u32 extra_bits,
199 				      struct extent_state **cached_state)
200 {
201 	return set_extent_bit(tree, start, end,
202 			      EXTENT_DELALLOC | extra_bits,
203 			      cached_state, GFP_NOFS);
204 }
205 
set_extent_defrag(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state)206 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
207 		u64 end, struct extent_state **cached_state)
208 {
209 	return set_extent_bit(tree, start, end,
210 			      EXTENT_DELALLOC | EXTENT_DEFRAG,
211 			      cached_state, GFP_NOFS);
212 }
213 
set_extent_new(struct extent_io_tree * tree,u64 start,u64 end)214 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
215 		u64 end)
216 {
217 	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, GFP_NOFS);
218 }
219 
set_extent_uptodate(struct extent_io_tree * tree,u64 start,u64 end,struct extent_state ** cached_state,gfp_t mask)220 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
221 		u64 end, struct extent_state **cached_state, gfp_t mask)
222 {
223 	return set_extent_bit(tree, start, end, EXTENT_UPTODATE,
224 			      cached_state, mask);
225 }
226 
227 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
228 			  u64 *start_ret, u64 *end_ret, u32 bits,
229 			  struct extent_state **cached_state);
230 void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
231 				 u64 *start_ret, u64 *end_ret, u32 bits);
232 int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start,
233 			       u64 *start_ret, u64 *end_ret, u32 bits);
234 bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
235 			       u64 *end, u64 max_bytes,
236 			       struct extent_state **cached_state);
237 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits);
238 
239 #endif /* BTRFS_EXTENT_IO_TREE_H */
240