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_ORDERED (1 << 9)
  17 #define EXTENT_ORDERED_METADATA (1 << 10)
  18 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  19
  20 /*
  21  * page->private values.  Every page that is controlled by the extent
  22  * map has page->private set to one.
  23  */
  24 #define EXTENT_PAGE_PRIVATE 1
  25 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  26
  27 struct extent_state;
  28
  29 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  30                                        struct bio *bio, int mirror_num);
  31 struct extent_io_ops {
  32         int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
  33         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  34         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  35         extent_submit_bio_hook_t *submit_bio_hook;
  36         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  37                               size_t size, struct bio *bio);
  38         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  39         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  40                                        u64 start, u64 end,
  41                                        struct extent_state *state);
  42         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  43                                         u64 start, u64 end,
  44                                        struct extent_state *state);
  45         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  46                                     struct extent_state *state);
  47         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  48                                       struct extent_state *state, int uptodate);
  49         int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
  50                             unsigned long old, unsigned long bits);
  51         int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
  52                             unsigned long old, unsigned long bits);
  53 };
  54
  55 struct extent_io_tree {
  56         struct rb_root state;
  57         struct address_space *mapping;
  58         u64 dirty_bytes;
  59         spinlock_t lock;
  60         struct extent_io_ops *ops;
  61         spinlock_t lru_lock;
  62         struct list_head buffer_lru;
  63         int lru_size;
  64         struct extent_state *last;
  65 };
  66
  67 struct extent_state {
  68         u64 start;
  69         u64 end; /* inclusive */
  70         struct rb_node rb_node;
  71         struct extent_io_tree *tree;
  72         wait_queue_head_t wq;
  73         atomic_t refs;
  74         unsigned long state;
  75
  76         /* for use by the FS */
  77         u64 private;
  78
  79         struct list_head leak_list;
  80 };
  81
  82 struct extent_buffer {
  83         u64 start;
  84         unsigned long len;
  85         char *map_token;
  86         char *kaddr;
  87         unsigned long map_start;
  88         unsigned long map_len;
  89         struct page *first_page;
  90         struct list_head lru;
  91         atomic_t refs;
  92         int flags;
  93         struct list_head leak_list;
  94 };
  95
  96 struct extent_map_tree;
  97
  98 static inline struct extent_state *extent_state_next(struct extent_state *state)
  99 {
 100         struct rb_node *node;
 101         node = rb_next(&state->rb_node);
 102         if (!node)
 103                 return NULL;
 104         return rb_entry(node, struct extent_state, rb_node);
 105 }
 106
 107 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 108                                           struct page *page,
 109                                           size_t page_offset,
 110                                           u64 start, u64 len,
 111                                           int create);
 112
 113 void extent_io_tree_init(struct extent_io_tree *tree,
 114                           struct address_space *mapping, gfp_t mask);
 115 void extent_io_tree_empty_lru(struct extent_io_tree *tree);
 116 int try_release_extent_mapping(struct extent_map_tree *map,
 117                                struct extent_io_tree *tree, struct page *page,
 118                                gfp_t mask);
 119 int try_release_extent_state(struct extent_map_tree *map,
 120                              struct extent_io_tree *tree, struct page *page,
 121                              gfp_t mask);
 122 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 123 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 124 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 125                           get_extent_t *get_extent);
 126 int __init extent_io_init(void);
 127 void extent_io_exit(void);
 128
 129 u64 count_range_bits(struct extent_io_tree *tree,
 130                      u64 *start, u64 search_end,
 131                      u64 max_bytes, unsigned long bits);
 132
 133 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 134                    int bits, int filled);
 135 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 136                       int bits, gfp_t mask);
 137 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 138                      int bits, int wake, int delete, gfp_t mask);
 139 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 140                     int bits, gfp_t mask);
 141 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 142                         gfp_t mask);
 143 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 144                    gfp_t mask);
 145 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 146                      gfp_t mask);
 147 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 148                        gfp_t mask);
 149 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 150                        gfp_t mask);
 151 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
 152                                   u64 end, gfp_t mask);
 153 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 154                      gfp_t mask);
 155 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 156                      gfp_t mask);
 157 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 158                           u64 *start_ret, u64 *end_ret, int bits);
 159 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 160                                                  u64 start, int bits);
 161 int extent_invalidatepage(struct extent_io_tree *tree,
 162                           struct page *page, unsigned long offset);
 163 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 164                           get_extent_t *get_extent,
 165                           struct writeback_control *wbc);
 166 int extent_writepages(struct extent_io_tree *tree,
 167                       struct address_space *mapping,
 168                       get_extent_t *get_extent,
 169                       struct writeback_control *wbc);
 170 int extent_readpages(struct extent_io_tree *tree,
 171                      struct address_space *mapping,
 172                      struct list_head *pages, unsigned nr_pages,
 173                      get_extent_t get_extent);
 174 int extent_prepare_write(struct extent_io_tree *tree,
 175                          struct inode *inode, struct page *page,
 176                          unsigned from, unsigned to, get_extent_t *get_extent);
 177 int extent_commit_write(struct extent_io_tree *tree,
 178                         struct inode *inode, struct page *page,
 179                         unsigned from, unsigned to);
 180 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 181                 get_extent_t *get_extent);
 182 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 183 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 184 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 185 void set_page_extent_mapped(struct page *page);
 186
 187 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 188                                           u64 start, unsigned long len,
 189                                           struct page *page0,
 190                                           gfp_t mask);
 191 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 192                                          u64 start, unsigned long len,
 193                                           gfp_t mask);
 194 void free_extent_buffer(struct extent_buffer *eb);
 195 int read_extent_buffer_pages(struct extent_io_tree *tree,
 196                              struct extent_buffer *eb, u64 start, int wait,
 197                              get_extent_t *get_extent, int mirror_num);
 198
 199 static inline void extent_buffer_get(struct extent_buffer *eb)
 200 {
 201         atomic_inc(&eb->refs);
 202 }
 203
 204 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 205                           unsigned long start,
 206                           unsigned long len);
 207 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 208                         unsigned long start,
 209                         unsigned long len);
 210 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 211                          unsigned long start, unsigned long len);
 212 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 213                         unsigned long dst_offset, unsigned long src_offset,
 214                         unsigned long len);
 215 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 216                            unsigned long src_offset, unsigned long len);
 217 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 218                            unsigned long src_offset, unsigned long len);
 219 void memset_extent_buffer(struct extent_buffer *eb, char c,
 220                           unsigned long start, unsigned long len);
 221 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
 222                                     struct extent_buffer *eb);
 223 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
 224 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 225 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 226                               struct extent_buffer *eb);
 227 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 228                              struct extent_buffer *eb);
 229 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 230                                struct extent_buffer *eb);
 231 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 232                                 struct extent_buffer *eb);
 233 int extent_buffer_uptodate(struct extent_io_tree *tree,
 234                            struct extent_buffer *eb);
 235 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 236                       unsigned long min_len, char **token, char **map,
 237                       unsigned long *map_start,
 238                       unsigned long *map_len, int km);
 239 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 240                       unsigned long min_len, char **token, char **map,
 241                       unsigned long *map_start,
 242                       unsigned long *map_len, int km);
 243 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 244 int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
 245                           unsigned long len);
 246 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
 247 int extent_range_uptodate(struct extent_io_tree *tree,
 248                           u64 start, u64 end);
 249 #endif