summaryrefslogtreecommitdiff
path: root/fs/btrfs/extent-io-tree.h
blob: a855f40dd61d49804cd2f13f174c66a32e02a2f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef BTRFS_EXTENT_IO_TREE_H
#define BTRFS_EXTENT_IO_TREE_H

struct extent_changeset;
struct io_failure_record;

/* Bits for the extent state */
#define EXTENT_DIRTY		(1U << 0)
#define EXTENT_UPTODATE		(1U << 1)
#define EXTENT_LOCKED		(1U << 2)
#define EXTENT_NEW		(1U << 3)
#define EXTENT_DELALLOC		(1U << 4)
#define EXTENT_DEFRAG		(1U << 5)
#define EXTENT_BOUNDARY		(1U << 6)
#define EXTENT_NODATASUM	(1U << 7)
#define EXTENT_CLEAR_META_RESV	(1U << 8)
#define EXTENT_NEED_WAIT	(1U << 9)
#define EXTENT_NORESERVE	(1U << 11)
#define EXTENT_QGROUP_RESERVED	(1U << 12)
#define EXTENT_CLEAR_DATA_RESV	(1U << 13)
/*
 * Must be cleared only during ordered extent completion or on error paths if we
 * did not manage to submit bios and create the ordered extents for the range.
 * Should not be cleared during page release and page invalidation (if there is
 * an ordered extent in flight), that is left for the ordered extent completion.
 */
#define EXTENT_DELALLOC_NEW	(1U << 14)
/*
 * When an ordered extent successfully completes for a region marked as a new
 * delalloc range, use this flag when clearing a new delalloc range to indicate
 * that the VFS' inode number of bytes should be incremented and the inode's new
 * delalloc bytes decremented, in an atomic way to prevent races with stat(2).
 */
#define EXTENT_ADD_INODE_BYTES  (1U << 15)

/*
 * Set during truncate when we're clearing an entire range and we just want the
 * extent states to go away.
 */
#define EXTENT_CLEAR_ALL_BITS	(1U << 16)

#define EXTENT_DO_ACCOUNTING    (EXTENT_CLEAR_META_RESV | \
				 EXTENT_CLEAR_DATA_RESV)
#define EXTENT_CTLBITS		(EXTENT_DO_ACCOUNTING | \
				 EXTENT_ADD_INODE_BYTES | \
				 EXTENT_CLEAR_ALL_BITS)

/*
 * Redefined bits above which are used only in the device allocation tree,
 * shouldn't be using EXTENT_LOCKED / EXTENT_BOUNDARY / EXTENT_CLEAR_META_RESV
 * / EXTENT_CLEAR_DATA_RESV because they have special meaning to the bit
 * manipulation functions
 */
#define CHUNK_ALLOCATED				EXTENT_DIRTY
#define CHUNK_TRIMMED				EXTENT_DEFRAG
#define CHUNK_STATE_MASK			(CHUNK_ALLOCATED |		\
						 CHUNK_TRIMMED)

enum {
	IO_TREE_FS_PINNED_EXTENTS,
	IO_TREE_FS_EXCLUDED_EXTENTS,
	IO_TREE_BTREE_INODE_IO,
	IO_TREE_INODE_IO,
	IO_TREE_RELOC_BLOCKS,
	IO_TREE_TRANS_DIRTY_PAGES,
	IO_TREE_ROOT_DIRTY_LOG_PAGES,
	IO_TREE_INODE_FILE_EXTENT,
	IO_TREE_LOG_CSUM_RANGE,
	IO_TREE_SELFTEST,
	IO_TREE_DEVICE_ALLOC_STATE,
};

struct extent_io_tree {
	struct rb_root state;
	struct btrfs_fs_info *fs_info;
	void *private_data;

	/* Who owns this io tree, should be one of IO_TREE_* */
	u8 owner;

	spinlock_t lock;
};

struct extent_state {
	u64 start;
	u64 end; /* inclusive */
	struct rb_node rb_node;

	/* ADD NEW ELEMENTS AFTER THIS */
	wait_queue_head_t wq;
	refcount_t refs;
	u32 state;

#ifdef CONFIG_BTRFS_DEBUG
	struct list_head leak_list;
#endif
};

void extent_io_tree_init(struct btrfs_fs_info *fs_info,
			 struct extent_io_tree *tree, unsigned int owner,
			 void *private_data);
void extent_io_tree_release(struct extent_io_tree *tree);

int lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
		struct extent_state **cached);

int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);

int __init extent_state_init_cachep(void);
void __cold extent_state_free_cachep(void);

u64 count_range_bits(struct extent_io_tree *tree,
		     u64 *start, u64 search_end,
		     u64 max_bytes, u32 bits, int contig);

void free_extent_state(struct extent_state *state);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   u32 bits, int filled, struct extent_state *cached_state);
int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
			     u32 bits, struct extent_changeset *changeset);
int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		       u32 bits, struct extent_state **cached, gfp_t mask,
		       struct extent_changeset *changeset);

static inline int clear_extent_bit(struct extent_io_tree *tree, u64 start,
				   u64 end, u32 bits,
				   struct extent_state **cached)
{
	return __clear_extent_bit(tree, start, end, bits, cached,
				  GFP_NOFS, NULL);
}

static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
				struct extent_state **cached)
{
	return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached,
				  GFP_NOFS, NULL);
}

static inline int unlock_extent_atomic(struct extent_io_tree *tree, u64 start,
				       u64 end, struct extent_state **cached)
{
	return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached,
				  GFP_ATOMIC, NULL);
}

static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
				    u64 end, u32 bits)
{
	return clear_extent_bit(tree, start, end, bits, NULL);
}

int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
			   u32 bits, struct extent_changeset *changeset);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   u32 bits, struct extent_state **cached_state, gfp_t mask);

static inline int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start,
					 u64 end, u32 bits)
{
	return set_extent_bit(tree, start, end, bits, NULL, GFP_NOWAIT);
}

static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
		u64 end, u32 bits)
{
	return set_extent_bit(tree, start, end, bits, NULL, GFP_NOFS);
}

static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state)
{
	return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE,
				  cached_state, GFP_NOFS, NULL);
}

static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
		u64 end, gfp_t mask)
{
	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, mask);
}

static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
				     u64 end, struct extent_state **cached)
{
	return clear_extent_bit(tree, start, end,
				EXTENT_DIRTY | EXTENT_DELALLOC |
				EXTENT_DO_ACCOUNTING, cached);
}

int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		       u32 bits, u32 clear_bits,
		       struct extent_state **cached_state);

static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
				      u64 end, u32 extra_bits,
				      struct extent_state **cached_state)
{
	return set_extent_bit(tree, start, end,
			      EXTENT_DELALLOC | extra_bits,
			      cached_state, GFP_NOFS);
}

static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state)
{
	return set_extent_bit(tree, start, end,
			      EXTENT_DELALLOC | EXTENT_DEFRAG,
			      cached_state, GFP_NOFS);
}

static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
		u64 end)
{
	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, GFP_NOFS);
}

static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state, gfp_t mask)
{
	return set_extent_bit(tree, start, end, EXTENT_UPTODATE,
			      cached_state, mask);
}

int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
			  u64 *start_ret, u64 *end_ret, u32 bits,
			  struct extent_state **cached_state);
void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
				 u64 *start_ret, u64 *end_ret, u32 bits);
int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start,
			       u64 *start_ret, u64 *end_ret, u32 bits);
bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
			       u64 *end, u64 max_bytes,
			       struct extent_state **cached_state);
void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits);

#endif /* BTRFS_EXTENT_IO_TREE_H */