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