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