fbd23a72f53b6dd6a1eb9f654ef1f080f1658e2c
4 #include <linux/rbtree.h>
6 #define EXTENT_MAP_HOLE (u64)-3
7 #define EXTENT_MAP_INLINE (u64)-2
8 #define EXTENT_MAP_DELALLOC (u64)-1
10 /* bits for the extent state */
11 #define EXTENT_DIRTY 1
12 #define EXTENT_WRITEBACK (1 << 1)
13 #define EXTENT_UPTODATE (1 << 2)
14 #define EXTENT_LOCKED (1 << 3)
15 #define EXTENT_NEW (1 << 4)
16 #define EXTENT_DELALLOC (1 << 5)
17 #define EXTENT_DEFRAG (1 << 6)
18 #define EXTENT_DEFRAG_DONE (1 << 7)
19 #define EXTENT_BUFFER_FILLED (1 << 8)
20 #define EXTENT_CSUM (1 << 9)
21 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24 * page->private values. Every page that is controlled by the extent
25 * map has page->private set to one.
27 #define EXTENT_PAGE_PRIVATE 1
28 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
31 struct extent_map_ops
{
32 int (*fill_delalloc
)(struct inode
*inode
, u64 start
, u64 end
);
33 int (*writepage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
34 int (*readpage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
35 int (*readpage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
);
36 void (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
);
39 struct extent_map_tree
{
42 struct address_space
*mapping
;
44 struct extent_map_ops
*ops
;
46 struct list_head buffer_lru
;
50 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
53 u64 end
; /* inclusive */
55 struct rb_node rb_node
;
56 /* block_start and block_end are in bytes */
58 u64 block_end
; /* inclusive */
59 struct block_device
*bdev
;
63 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
66 u64 end
; /* inclusive */
68 struct rb_node rb_node
;
73 /* for use by the FS */
76 struct list_head list
;
79 struct extent_buffer
{
84 unsigned long map_start
;
85 unsigned long map_len
;
86 struct page
*first_page
;
92 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
98 void extent_map_tree_init(struct extent_map_tree
*tree
,
99 struct address_space
*mapping
, gfp_t mask
);
100 void extent_map_tree_empty_lru(struct extent_map_tree
*tree
);
101 struct extent_map
*lookup_extent_mapping(struct extent_map_tree
*tree
,
103 int add_extent_mapping(struct extent_map_tree
*tree
,
104 struct extent_map
*em
);
105 int remove_extent_mapping(struct extent_map_tree
*tree
, struct extent_map
*em
);
106 int try_release_extent_mapping(struct extent_map_tree
*tree
, struct page
*page
);
107 int lock_extent(struct extent_map_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
108 int unlock_extent(struct extent_map_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
109 struct extent_map
*alloc_extent_map(gfp_t mask
);
110 void free_extent_map(struct extent_map
*em
);
111 int extent_read_full_page(struct extent_map_tree
*tree
, struct page
*page
,
112 get_extent_t
*get_extent
);
113 void __init
extent_map_init(void);
114 void __exit
extent_map_exit(void);
116 int test_range_bit(struct extent_map_tree
*tree
, u64 start
, u64 end
,
117 int bits
, int filled
);
118 int clear_extent_bits(struct extent_map_tree
*tree
, u64 start
, u64 end
,
119 int bits
, gfp_t mask
);
120 int set_extent_bits(struct extent_map_tree
*tree
, u64 start
, u64 end
,
121 int bits
, gfp_t mask
);
122 int set_extent_uptodate(struct extent_map_tree
*tree
, u64 start
, u64 end
,
124 int set_extent_new(struct extent_map_tree
*tree
, u64 start
, u64 end
,
126 int set_extent_dirty(struct extent_map_tree
*tree
, u64 start
, u64 end
,
128 int clear_extent_dirty(struct extent_map_tree
*tree
, u64 start
, u64 end
,
130 int set_extent_delalloc(struct extent_map_tree
*tree
, u64 start
, u64 end
,
132 int find_first_extent_bit(struct extent_map_tree
*tree
, u64 start
,
133 u64
*start_ret
, u64
*end_ret
, int bits
);
134 int extent_invalidatepage(struct extent_map_tree
*tree
,
135 struct page
*page
, unsigned long offset
);
136 int extent_write_full_page(struct extent_map_tree
*tree
, struct page
*page
,
137 get_extent_t
*get_extent
,
138 struct writeback_control
*wbc
);
139 int extent_writepages(struct extent_map_tree
*tree
,
140 struct address_space
*mapping
,
141 get_extent_t
*get_extent
,
142 struct writeback_control
*wbc
);
143 int extent_readpages(struct extent_map_tree
*tree
,
144 struct address_space
*mapping
,
145 struct list_head
*pages
, unsigned nr_pages
,
146 get_extent_t get_extent
);
147 int extent_prepare_write(struct extent_map_tree
*tree
,
148 struct inode
*inode
, struct page
*page
,
149 unsigned from
, unsigned to
, get_extent_t
*get_extent
);
150 int extent_commit_write(struct extent_map_tree
*tree
,
151 struct inode
*inode
, struct page
*page
,
152 unsigned from
, unsigned to
);
153 sector_t
extent_bmap(struct address_space
*mapping
, sector_t iblock
,
154 get_extent_t
*get_extent
);
155 int set_range_dirty(struct extent_map_tree
*tree
, u64 start
, u64 end
);
156 int set_state_private(struct extent_map_tree
*tree
, u64 start
, u64
private);
157 int get_state_private(struct extent_map_tree
*tree
, u64 start
, u64
*private);
158 void set_page_extent_mapped(struct page
*page
);
160 struct extent_buffer
*alloc_extent_buffer(struct extent_map_tree
*tree
,
161 u64 start
, unsigned long len
,
164 struct extent_buffer
*find_extent_buffer(struct extent_map_tree
*tree
,
165 u64 start
, unsigned long len
,
167 void free_extent_buffer(struct extent_buffer
*eb
);
168 int read_extent_buffer_pages(struct extent_map_tree
*tree
,
169 struct extent_buffer
*eb
, u64 start
, int wait
);
171 static inline void extent_buffer_get(struct extent_buffer
*eb
)
173 atomic_inc(&eb
->refs
);
176 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
179 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
182 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
183 unsigned long start
, unsigned long len
);
184 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
185 unsigned long dst_offset
, unsigned long src_offset
,
187 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
188 unsigned long src_offset
, unsigned long len
);
189 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
190 unsigned long src_offset
, unsigned long len
);
191 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
192 unsigned long start
, unsigned long len
);
193 int wait_on_extent_buffer_writeback(struct extent_map_tree
*tree
,
194 struct extent_buffer
*eb
);
195 int clear_extent_buffer_dirty(struct extent_map_tree
*tree
,
196 struct extent_buffer
*eb
);
197 int set_extent_buffer_dirty(struct extent_map_tree
*tree
,
198 struct extent_buffer
*eb
);
199 int set_extent_buffer_uptodate(struct extent_map_tree
*tree
,
200 struct extent_buffer
*eb
);
201 int extent_buffer_uptodate(struct extent_map_tree
*tree
,
202 struct extent_buffer
*eb
);
203 int map_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
204 unsigned long min_len
, char **token
, char **map
,
205 unsigned long *map_start
,
206 unsigned long *map_len
, int km
);
207 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
208 unsigned long min_len
, char **token
, char **map
,
209 unsigned long *map_start
,
210 unsigned long *map_len
, int km
);
211 void unmap_extent_buffer(struct extent_buffer
*eb
, char *token
, int km
);
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