fs/btrfs/extent_io.h

   1 #ifndef __EXTENTIO__
   2 #define __EXTENTIO__
   3
   4 #include <linux/rbtree.h>
   5
   6 /* bits for the extent state */
   7 #define EXTENT_DIRTY 1
   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)
  18
  19 /*
  20  * page->private values.  Every page that is controlled by the extent
  21  * map has page->private set to one.
  22  */
  23 #define EXTENT_PAGE_PRIVATE 1
  24 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  25
  26 struct extent_state;
  27
  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 (*submit_bio_hook)(struct inode *inode, int rw, struct bio *bio);
  32         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  33                               size_t size, struct bio *bio);
  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                                     struct extent_state *state);
  37         void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  38                                       struct extent_state *state);
  39         int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
  40                             unsigned long old, unsigned long bits);
  41         int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
  42                             unsigned long old, unsigned long bits);
  43 };
  44
  45 struct extent_io_tree {
  46         struct rb_root state;
  47         struct address_space *mapping;
  48         u64 dirty_bytes;
  49         spinlock_t lock;
  50         struct extent_io_ops *ops;
  51         spinlock_t lru_lock;
  52         struct list_head buffer_lru;
  53         int lru_size;
  54         struct extent_state *last;
  55 };
  56
  57 struct extent_state {
  58         u64 start;
  59         u64 end; /* inclusive */
  60         struct rb_node rb_node;
  61         struct extent_io_tree *tree;
  62         wait_queue_head_t wq;
  63         atomic_t refs;
  64         unsigned long state;
  65
  66         /* for use by the FS */
  67         u64 private;
  68
  69         struct list_head leak_list;
  70 };
  71
  72 struct extent_buffer {
  73         u64 start;
  74         unsigned long len;
  75         char *map_token;
  76         char *kaddr;
  77         unsigned long map_start;
  78         unsigned long map_len;
  79         struct page *first_page;
  80         struct list_head lru;
  81         atomic_t refs;
  82         int flags;
  83         struct list_head leak_list;
  84 };
  85
  86 struct extent_map_tree;
  87
  88 static inline struct extent_state *extent_state_next(struct extent_state *state)
  89 {
  90         struct rb_node *node;
  91         node = rb_next(&state->rb_node);
  92         if (!node)
  93                 return NULL;
  94         return rb_entry(node, struct extent_state, rb_node);
  95 }
  96
  97 typedef struct extent_map *(get_extent_t)(struct inode *inode,
  98                                           struct page *page,
  99                                           size_t page_offset,
 100                                           u64 start, u64 len,
 101                                           int create);
 102
 103 void extent_io_tree_init(struct extent_io_tree *tree,
 104                           struct address_space *mapping, gfp_t mask);
 105 void extent_io_tree_empty_lru(struct extent_io_tree *tree);
 106 int try_release_extent_mapping(struct extent_map_tree *map,
 107                                struct extent_io_tree *tree, struct page *page,
 108                                gfp_t mask);
 109 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 110 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 111 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 112                           get_extent_t *get_extent);
 113 int __init extent_io_init(void);
 114 void extent_io_exit(void);
 115
 116 u64 count_range_bits(struct extent_io_tree *tree,
 117                      u64 *start, u64 search_end,
 118                      u64 max_bytes, unsigned long bits);
 119
 120 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 121                    int bits, int filled);
 122 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 123                       int bits, gfp_t mask);
 124 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 125                     int bits, gfp_t mask);
 126 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 127                         gfp_t mask);
 128 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 129                    gfp_t mask);
 130 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 131                      gfp_t mask);
 132 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 133                        gfp_t mask);
 134 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 135                      gfp_t mask);
 136 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 137                           u64 *start_ret, u64 *end_ret, int bits);
 138 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 139                                                  u64 start, int bits);
 140 int extent_invalidatepage(struct extent_io_tree *tree,
 141                           struct page *page, unsigned long offset);
 142 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 143                           get_extent_t *get_extent,
 144                           struct writeback_control *wbc);
 145 int extent_writepages(struct extent_io_tree *tree,
 146                       struct address_space *mapping,
 147                       get_extent_t *get_extent,
 148                       struct writeback_control *wbc);
 149 int extent_readpages(struct extent_io_tree *tree,
 150                      struct address_space *mapping,
 151                      struct list_head *pages, unsigned nr_pages,
 152                      get_extent_t get_extent);
 153 int extent_prepare_write(struct extent_io_tree *tree,
 154                          struct inode *inode, struct page *page,
 155                          unsigned from, unsigned to, get_extent_t *get_extent);
 156 int extent_commit_write(struct extent_io_tree *tree,
 157                         struct inode *inode, struct page *page,
 158                         unsigned from, unsigned to);
 159 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 160                 get_extent_t *get_extent);
 161 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 162 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 163 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 164 void set_page_extent_mapped(struct page *page);
 165
 166 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 167                                           u64 start, unsigned long len,
 168                                           struct page *page0,
 169                                           gfp_t mask);
 170 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 171                                          u64 start, unsigned long len,
 172                                           gfp_t mask);
 173 void free_extent_buffer(struct extent_buffer *eb);
 174 int read_extent_buffer_pages(struct extent_io_tree *tree,
 175                              struct extent_buffer *eb, u64 start, int wait,
 176                              get_extent_t *get_extent);
 177
 178 static inline void extent_buffer_get(struct extent_buffer *eb)
 179 {
 180         atomic_inc(&eb->refs);
 181 }
 182
 183 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 184                           unsigned long start,
 185                           unsigned long len);
 186 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 187                         unsigned long start,
 188                         unsigned long len);
 189 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 190                          unsigned long start, unsigned long len);
 191 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 192                         unsigned long dst_offset, unsigned long src_offset,
 193                         unsigned long len);
 194 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 195                            unsigned long src_offset, unsigned long len);
 196 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 197                            unsigned long src_offset, unsigned long len);
 198 void memset_extent_buffer(struct extent_buffer *eb, char c,
 199                           unsigned long start, unsigned long len);
 200 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
 201                                     struct extent_buffer *eb);
 202 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 203                               struct extent_buffer *eb);
 204 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 205                              struct extent_buffer *eb);
 206 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 207                                struct extent_buffer *eb);
 208 int extent_buffer_uptodate(struct extent_io_tree *tree,
 209                            struct extent_buffer *eb);
 210 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 211                       unsigned long min_len, char **token, char **map,
 212                       unsigned long *map_start,
 213                       unsigned long *map_len, int km);
 214 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 215                       unsigned long min_len, char **token, char **map,
 216                       unsigned long *map_start,
 217                       unsigned long *map_len, int km);
 218 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 219 int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
 220                           unsigned long len);
 221 #endif