]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - fs/btrfs/extent_io.h
4 #include <linux/rbtree.h>
6 /* bits for the extent state */
8 #define EXTENT_WRITEBACK (1 << 1)
9 #define EXTENT_UPTODATE (1 << 2)
10 #define EXTENT_LOCKED (1 << 3)
11 #define EXTENT_NEW (1 << 4)
12 #define EXTENT_DELALLOC (1 << 5)
13 #define EXTENT_DEFRAG (1 << 6)
14 #define EXTENT_DEFRAG_DONE (1 << 7)
15 #define EXTENT_BUFFER_FILLED (1 << 8)
16 #define EXTENT_CSUM (1 << 9)
17 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
20 * page->private values. Every page that is controlled by the extent
21 * map has page->private set to one.
23 #define EXTENT_PAGE_PRIVATE 1
24 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
28 struct extent_io_ops
{
29 int (*fill_delalloc
)(struct inode
*inode
, u64 start
, u64 end
);
30 int (*writepage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
31 int (*readpage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
32 int (*readpage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
33 struct extent_state
*state
);
34 void (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
35 struct extent_state
*state
);
36 int (*set_bit_hook
)(struct inode
*inode
, u64 start
, u64 end
,
38 int (*clear_bit_hook
)(struct inode
*inode
, u64 start
, u64 end
,
42 struct extent_io_tree
{
44 struct address_space
*mapping
;
47 struct extent_io_ops
*ops
;
49 struct list_head buffer_lru
;
55 u64 end
; /* inclusive */
56 struct rb_node rb_node
;
57 struct extent_io_tree
*tree
;
62 /* for use by the FS */
65 struct list_head list
;
68 struct extent_buffer
{
73 unsigned long map_start
;
74 unsigned long map_len
;
75 struct page
*first_page
;
81 struct extent_map_tree
;
83 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
89 void extent_io_tree_init(struct extent_io_tree
*tree
,
90 struct address_space
*mapping
, gfp_t mask
);
91 void extent_io_tree_empty_lru(struct extent_io_tree
*tree
);
92 int try_release_extent_mapping(struct extent_map_tree
*map
,
93 struct extent_io_tree
*tree
, struct page
*page
,
95 int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
96 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
, gfp_t mask
);
97 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
98 get_extent_t
*get_extent
);
99 int __init
extent_io_init(void);
100 void extent_io_exit(void);
102 u64
count_range_bits(struct extent_io_tree
*tree
,
103 u64
*start
, u64 search_end
,
104 u64 max_bytes
, unsigned long bits
);
106 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
107 int bits
, int filled
);
108 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
109 int bits
, gfp_t mask
);
110 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
111 int bits
, gfp_t mask
);
112 int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
114 int set_extent_new(struct extent_io_tree
*tree
, u64 start
, u64 end
,
116 int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
118 int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
120 int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
, u64 end
,
122 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
123 u64
*start_ret
, u64
*end_ret
, int bits
);
124 int extent_invalidatepage(struct extent_io_tree
*tree
,
125 struct page
*page
, unsigned long offset
);
126 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
127 get_extent_t
*get_extent
,
128 struct writeback_control
*wbc
);
129 int extent_writepages(struct extent_io_tree
*tree
,
130 struct address_space
*mapping
,
131 get_extent_t
*get_extent
,
132 struct writeback_control
*wbc
);
133 int extent_readpages(struct extent_io_tree
*tree
,
134 struct address_space
*mapping
,
135 struct list_head
*pages
, unsigned nr_pages
,
136 get_extent_t get_extent
);
137 int extent_prepare_write(struct extent_io_tree
*tree
,
138 struct inode
*inode
, struct page
*page
,
139 unsigned from
, unsigned to
, get_extent_t
*get_extent
);
140 int extent_commit_write(struct extent_io_tree
*tree
,
141 struct inode
*inode
, struct page
*page
,
142 unsigned from
, unsigned to
);
143 sector_t
extent_bmap(struct address_space
*mapping
, sector_t iblock
,
144 get_extent_t
*get_extent
);
145 int set_range_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
);
146 int set_state_private(struct extent_io_tree
*tree
, u64 start
, u64
private);
147 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
148 void set_page_extent_mapped(struct page
*page
);
150 struct extent_buffer
*alloc_extent_buffer(struct extent_io_tree
*tree
,
151 u64 start
, unsigned long len
,
154 struct extent_buffer
*find_extent_buffer(struct extent_io_tree
*tree
,
155 u64 start
, unsigned long len
,
157 void free_extent_buffer(struct extent_buffer
*eb
);
158 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
159 struct extent_buffer
*eb
, u64 start
, int wait
);
161 static inline void extent_buffer_get(struct extent_buffer
*eb
)
163 atomic_inc(&eb
->refs
);
166 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
169 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
172 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
173 unsigned long start
, unsigned long len
);
174 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
175 unsigned long dst_offset
, unsigned long src_offset
,
177 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
178 unsigned long src_offset
, unsigned long len
);
179 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
180 unsigned long src_offset
, unsigned long len
);
181 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
182 unsigned long start
, unsigned long len
);
183 int wait_on_extent_buffer_writeback(struct extent_io_tree
*tree
,
184 struct extent_buffer
*eb
);
185 int clear_extent_buffer_dirty(struct extent_io_tree
*tree
,
186 struct extent_buffer
*eb
);
187 int set_extent_buffer_dirty(struct extent_io_tree
*tree
,
188 struct extent_buffer
*eb
);
189 int set_extent_buffer_uptodate(struct extent_io_tree
*tree
,
190 struct extent_buffer
*eb
);
191 int extent_buffer_uptodate(struct extent_io_tree
*tree
,
192 struct extent_buffer
*eb
);
193 int map_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
194 unsigned long min_len
, char **token
, char **map
,
195 unsigned long *map_start
,
196 unsigned long *map_len
, int km
);
197 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
198 unsigned long min_len
, char **token
, char **map
,
199 unsigned long *map_start
,
200 unsigned long *map_len
, int km
);
201 void unmap_extent_buffer(struct extent_buffer
*eb
, char *token
, int km
);