extent_io.h 7.0 KB

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  1. #ifndef __EXTENTIO__
  2. #define __EXTENTIO__
  3. #include <linux/rbtree.h>
  4. /* bits for the extent state */
  5. #define EXTENT_DIRTY 1
  6. #define EXTENT_WRITEBACK (1 << 1)
  7. #define EXTENT_UPTODATE (1 << 2)
  8. #define EXTENT_LOCKED (1 << 3)
  9. #define EXTENT_NEW (1 << 4)
  10. #define EXTENT_DELALLOC (1 << 5)
  11. #define EXTENT_DEFRAG (1 << 6)
  12. #define EXTENT_DEFRAG_DONE (1 << 7)
  13. #define EXTENT_BUFFER_FILLED (1 << 8)
  14. #define EXTENT_CSUM (1 << 9)
  15. #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  16. /*
  17. * page->private values. Every page that is controlled by the extent
  18. * map has page->private set to one.
  19. */
  20. #define EXTENT_PAGE_PRIVATE 1
  21. #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  22. struct extent_state;
  23. struct extent_io_ops {
  24. int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
  25. int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  26. int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  27. int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  28. struct extent_state *state);
  29. void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  30. struct extent_state *state);
  31. };
  32. struct extent_io_tree {
  33. struct rb_root state;
  34. struct address_space *mapping;
  35. u64 dirty_bytes;
  36. spinlock_t lock;
  37. struct extent_io_ops *ops;
  38. spinlock_t lru_lock;
  39. struct list_head buffer_lru;
  40. int lru_size;
  41. };
  42. struct extent_state {
  43. u64 start;
  44. u64 end; /* inclusive */
  45. struct rb_node rb_node;
  46. struct extent_io_tree *tree;
  47. wait_queue_head_t wq;
  48. atomic_t refs;
  49. unsigned long state;
  50. /* for use by the FS */
  51. u64 private;
  52. struct list_head list;
  53. };
  54. struct extent_buffer {
  55. u64 start;
  56. unsigned long len;
  57. char *map_token;
  58. char *kaddr;
  59. unsigned long map_start;
  60. unsigned long map_len;
  61. struct page *first_page;
  62. struct list_head lru;
  63. atomic_t refs;
  64. int flags;
  65. };
  66. struct extent_map_tree;
  67. typedef struct extent_map *(get_extent_t)(struct inode *inode,
  68. struct page *page,
  69. size_t page_offset,
  70. u64 start, u64 len,
  71. int create);
  72. void extent_io_tree_init(struct extent_io_tree *tree,
  73. struct address_space *mapping, gfp_t mask);
  74. void extent_io_tree_empty_lru(struct extent_io_tree *tree);
  75. int try_release_extent_mapping(struct extent_map_tree *map,
  76. struct extent_io_tree *tree, struct page *page,
  77. gfp_t mask);
  78. int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
  79. int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
  80. int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
  81. get_extent_t *get_extent);
  82. int __init extent_io_init(void);
  83. void extent_io_exit(void);
  84. u64 count_range_bits(struct extent_io_tree *tree,
  85. u64 *start, u64 search_end,
  86. u64 max_bytes, unsigned long bits);
  87. int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
  88. int bits, int filled);
  89. int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
  90. int bits, gfp_t mask);
  91. int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
  92. int bits, gfp_t mask);
  93. int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
  94. gfp_t mask);
  95. int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
  96. gfp_t mask);
  97. int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
  98. gfp_t mask);
  99. int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
  100. gfp_t mask);
  101. int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
  102. gfp_t mask);
  103. int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
  104. u64 *start_ret, u64 *end_ret, int bits);
  105. int extent_invalidatepage(struct extent_io_tree *tree,
  106. struct page *page, unsigned long offset);
  107. int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
  108. get_extent_t *get_extent,
  109. struct writeback_control *wbc);
  110. int extent_writepages(struct extent_io_tree *tree,
  111. struct address_space *mapping,
  112. get_extent_t *get_extent,
  113. struct writeback_control *wbc);
  114. int extent_readpages(struct extent_io_tree *tree,
  115. struct address_space *mapping,
  116. struct list_head *pages, unsigned nr_pages,
  117. get_extent_t get_extent);
  118. int extent_prepare_write(struct extent_io_tree *tree,
  119. struct inode *inode, struct page *page,
  120. unsigned from, unsigned to, get_extent_t *get_extent);
  121. int extent_commit_write(struct extent_io_tree *tree,
  122. struct inode *inode, struct page *page,
  123. unsigned from, unsigned to);
  124. sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
  125. get_extent_t *get_extent);
  126. int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
  127. int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
  128. int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
  129. void set_page_extent_mapped(struct page *page);
  130. struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
  131. u64 start, unsigned long len,
  132. struct page *page0,
  133. gfp_t mask);
  134. struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
  135. u64 start, unsigned long len,
  136. gfp_t mask);
  137. void free_extent_buffer(struct extent_buffer *eb);
  138. int read_extent_buffer_pages(struct extent_io_tree *tree,
  139. struct extent_buffer *eb, u64 start, int wait);
  140. static inline void extent_buffer_get(struct extent_buffer *eb)
  141. {
  142. atomic_inc(&eb->refs);
  143. }
  144. int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
  145. unsigned long start,
  146. unsigned long len);
  147. void read_extent_buffer(struct extent_buffer *eb, void *dst,
  148. unsigned long start,
  149. unsigned long len);
  150. void write_extent_buffer(struct extent_buffer *eb, const void *src,
  151. unsigned long start, unsigned long len);
  152. void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
  153. unsigned long dst_offset, unsigned long src_offset,
  154. unsigned long len);
  155. void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
  156. unsigned long src_offset, unsigned long len);
  157. void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
  158. unsigned long src_offset, unsigned long len);
  159. void memset_extent_buffer(struct extent_buffer *eb, char c,
  160. unsigned long start, unsigned long len);
  161. int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
  162. struct extent_buffer *eb);
  163. int clear_extent_buffer_dirty(struct extent_io_tree *tree,
  164. struct extent_buffer *eb);
  165. int set_extent_buffer_dirty(struct extent_io_tree *tree,
  166. struct extent_buffer *eb);
  167. int set_extent_buffer_uptodate(struct extent_io_tree *tree,
  168. struct extent_buffer *eb);
  169. int extent_buffer_uptodate(struct extent_io_tree *tree,
  170. struct extent_buffer *eb);
  171. int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
  172. unsigned long min_len, char **token, char **map,
  173. unsigned long *map_start,
  174. unsigned long *map_len, int km);
  175. int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
  176. unsigned long min_len, char **token, char **map,
  177. unsigned long *map_start,
  178. unsigned long *map_len, int km);
  179. void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
  180. #endif