extent_io.h 8.2 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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  15. /*
  16. * page->private values. Every page that is controlled by the extent
  17. * map has page->private set to one.
  18. */
  19. #define EXTENT_PAGE_PRIVATE 1
  20. #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  21. struct extent_state;
  22. struct extent_io_ops {
  23. int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
  24. int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  25. int (*submit_bio_hook)(struct inode *inode, int rw, struct bio *bio,
  26. int mirror_num);
  27. int (*merge_bio_hook)(struct page *page, unsigned long offset,
  28. size_t size, struct bio *bio);
  29. int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  30. int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  31. u64 start, u64 end,
  32. struct extent_state *state);
  33. int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  34. struct extent_state *state);
  35. void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  36. struct extent_state *state);
  37. int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
  38. unsigned long old, unsigned long bits);
  39. int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
  40. unsigned long old, unsigned long bits);
  41. };
  42. struct extent_io_tree {
  43. struct rb_root state;
  44. struct address_space *mapping;
  45. u64 dirty_bytes;
  46. spinlock_t lock;
  47. struct extent_io_ops *ops;
  48. spinlock_t lru_lock;
  49. struct list_head buffer_lru;
  50. int lru_size;
  51. struct extent_state *last;
  52. };
  53. struct extent_state {
  54. u64 start;
  55. u64 end; /* inclusive */
  56. struct rb_node rb_node;
  57. struct extent_io_tree *tree;
  58. wait_queue_head_t wq;
  59. atomic_t refs;
  60. unsigned long state;
  61. /* for use by the FS */
  62. u64 private;
  63. struct list_head leak_list;
  64. };
  65. struct extent_buffer {
  66. u64 start;
  67. unsigned long len;
  68. char *map_token;
  69. char *kaddr;
  70. unsigned long map_start;
  71. unsigned long map_len;
  72. struct page *first_page;
  73. struct list_head lru;
  74. atomic_t refs;
  75. int flags;
  76. struct list_head leak_list;
  77. };
  78. struct extent_map_tree;
  79. static inline struct extent_state *extent_state_next(struct extent_state *state)
  80. {
  81. struct rb_node *node;
  82. node = rb_next(&state->rb_node);
  83. if (!node)
  84. return NULL;
  85. return rb_entry(node, struct extent_state, rb_node);
  86. }
  87. typedef struct extent_map *(get_extent_t)(struct inode *inode,
  88. struct page *page,
  89. size_t page_offset,
  90. u64 start, u64 len,
  91. int create);
  92. void extent_io_tree_init(struct extent_io_tree *tree,
  93. struct address_space *mapping, gfp_t mask);
  94. void extent_io_tree_empty_lru(struct extent_io_tree *tree);
  95. int try_release_extent_mapping(struct extent_map_tree *map,
  96. struct extent_io_tree *tree, struct page *page,
  97. gfp_t mask);
  98. int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
  99. int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
  100. int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
  101. get_extent_t *get_extent);
  102. int __init extent_io_init(void);
  103. void extent_io_exit(void);
  104. u64 count_range_bits(struct extent_io_tree *tree,
  105. u64 *start, u64 search_end,
  106. u64 max_bytes, unsigned long bits);
  107. int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
  108. int bits, int filled);
  109. int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
  110. int bits, gfp_t mask);
  111. int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
  112. int bits, gfp_t mask);
  113. int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
  114. gfp_t mask);
  115. int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
  116. gfp_t mask);
  117. int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
  118. gfp_t mask);
  119. int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
  120. gfp_t mask);
  121. int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
  122. gfp_t mask);
  123. int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
  124. u64 *start_ret, u64 *end_ret, int bits);
  125. struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
  126. u64 start, int bits);
  127. int extent_invalidatepage(struct extent_io_tree *tree,
  128. struct page *page, unsigned long offset);
  129. int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
  130. get_extent_t *get_extent,
  131. struct writeback_control *wbc);
  132. int extent_writepages(struct extent_io_tree *tree,
  133. struct address_space *mapping,
  134. get_extent_t *get_extent,
  135. struct writeback_control *wbc);
  136. int extent_readpages(struct extent_io_tree *tree,
  137. struct address_space *mapping,
  138. struct list_head *pages, unsigned nr_pages,
  139. get_extent_t get_extent);
  140. int extent_prepare_write(struct extent_io_tree *tree,
  141. struct inode *inode, struct page *page,
  142. unsigned from, unsigned to, get_extent_t *get_extent);
  143. int extent_commit_write(struct extent_io_tree *tree,
  144. struct inode *inode, struct page *page,
  145. unsigned from, unsigned to);
  146. sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
  147. get_extent_t *get_extent);
  148. int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
  149. int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
  150. int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
  151. void set_page_extent_mapped(struct page *page);
  152. struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
  153. u64 start, unsigned long len,
  154. struct page *page0,
  155. gfp_t mask);
  156. struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
  157. u64 start, unsigned long len,
  158. gfp_t mask);
  159. void free_extent_buffer(struct extent_buffer *eb);
  160. int read_extent_buffer_pages(struct extent_io_tree *tree,
  161. struct extent_buffer *eb, u64 start, int wait,
  162. get_extent_t *get_extent, int mirror_num);
  163. static inline void extent_buffer_get(struct extent_buffer *eb)
  164. {
  165. atomic_inc(&eb->refs);
  166. }
  167. int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
  168. unsigned long start,
  169. unsigned long len);
  170. void read_extent_buffer(struct extent_buffer *eb, void *dst,
  171. unsigned long start,
  172. unsigned long len);
  173. void write_extent_buffer(struct extent_buffer *eb, const void *src,
  174. unsigned long start, unsigned long len);
  175. void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
  176. unsigned long dst_offset, unsigned long src_offset,
  177. unsigned long len);
  178. void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
  179. unsigned long src_offset, unsigned long len);
  180. void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
  181. unsigned long src_offset, unsigned long len);
  182. void memset_extent_buffer(struct extent_buffer *eb, char c,
  183. unsigned long start, unsigned long len);
  184. int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
  185. struct extent_buffer *eb);
  186. int clear_extent_buffer_dirty(struct extent_io_tree *tree,
  187. struct extent_buffer *eb);
  188. int set_extent_buffer_dirty(struct extent_io_tree *tree,
  189. struct extent_buffer *eb);
  190. int set_extent_buffer_uptodate(struct extent_io_tree *tree,
  191. struct extent_buffer *eb);
  192. int extent_buffer_uptodate(struct extent_io_tree *tree,
  193. struct extent_buffer *eb);
  194. int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
  195. unsigned long min_len, char **token, char **map,
  196. unsigned long *map_start,
  197. unsigned long *map_len, int km);
  198. int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
  199. unsigned long min_len, char **token, char **map,
  200. unsigned long *map_start,
  201. unsigned long *map_len, int km);
  202. void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
  203. int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
  204. unsigned long len);
  205. int release_extent_buffer_tail_pages(struct extent_buffer *eb);
  206. int extent_range_uptodate(struct extent_io_tree *tree,
  207. u64 start, u64 end);
  208. #endif