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