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_BOUNDARY (1 << 11)
  19 #define EXTENT_NODATASUM (1 << 12)
  20 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  21
  22 /* flags for bio submission */
  23 #define EXTENT_BIO_COMPRESSED 1
  24
  25 /*
  26  * page->private values.  Every page that is controlled by the extent
  27  * map has page->private set to one.
  28  */
  29 #define EXTENT_PAGE_PRIVATE 1
  30 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  31
  32 struct extent_state;
  33
  34 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  35                                        struct bio *bio, int mirror_num,
  36                                        unsigned long bio_flags);
  37 struct extent_io_ops {
  38         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  39                              u64 start, u64 end, int *page_started,
  40                              unsigned long *nr_written);
  41         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  42         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  43         extent_submit_bio_hook_t *submit_bio_hook;
  44         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  45                               size_t size, struct bio *bio,
  46                               unsigned long bio_flags);
  47         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  48         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  49                                        u64 start, u64 end,
  50                                        struct extent_state *state);
  51         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  52                                         u64 start, u64 end,
  53                                        struct extent_state *state);
  54         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  55                                     struct extent_state *state);
  56         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  57                                       struct extent_state *state, int uptodate);
  58         int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
  59                             unsigned long old, unsigned long bits);
  60         int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
  61                             unsigned long old, unsigned long bits);
  62         int (*write_cache_pages_lock_hook)(struct page *page);
  63 };
  64
  65 struct extent_io_tree {
  66         struct rb_root state;
  67         struct rb_root buffer;
  68         struct address_space *mapping;
  69         u64 dirty_bytes;
  70         spinlock_t lock;
  71         spinlock_t buffer_lock;
  72         struct extent_io_ops *ops;
  73 };
  74
  75 struct extent_state {
  76         u64 start;
  77         u64 end; /* inclusive */
  78         struct rb_node rb_node;
  79         struct extent_io_tree *tree;
  80         wait_queue_head_t wq;
  81         atomic_t refs;
  82         unsigned long state;
  83
  84         /* for use by the FS */
  85         u64 private;
  86
  87         struct list_head leak_list;
  88 };
  89
  90 struct extent_buffer {
  91         u64 start;
  92         unsigned long len;
  93         char *map_token;
  94         char *kaddr;
  95         unsigned long map_start;
  96         unsigned long map_len;
  97         struct page *first_page;
  98         atomic_t refs;
  99         int flags;
 100         struct list_head leak_list;
 101         struct rb_node rb_node;
 102         struct mutex mutex;
 103 };
 104
 105 struct extent_map_tree;
 106
 107 static inline struct extent_state *extent_state_next(struct extent_state *state)
 108 {
 109         struct rb_node *node;
 110         node = rb_next(&state->rb_node);
 111         if (!node)
 112                 return NULL;
 113         return rb_entry(node, struct extent_state, rb_node);
 114 }
 115
 116 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 117                                           struct page *page,
 118                                           size_t page_offset,
 119                                           u64 start, u64 len,
 120                                           int create);
 121
 122 void extent_io_tree_init(struct extent_io_tree *tree,
 123                           struct address_space *mapping, gfp_t mask);
 124 int try_release_extent_mapping(struct extent_map_tree *map,
 125                                struct extent_io_tree *tree, struct page *page,
 126                                gfp_t mask);
 127 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 128 int try_release_extent_state(struct extent_map_tree *map,
 129                              struct extent_io_tree *tree, struct page *page,
 130                              gfp_t mask);
 131 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 132 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 133 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 134                     gfp_t mask);
 135 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 136                           get_extent_t *get_extent);
 137 int __init extent_io_init(void);
 138 void extent_io_exit(void);
 139
 140 u64 count_range_bits(struct extent_io_tree *tree,
 141                      u64 *start, u64 search_end,
 142                      u64 max_bytes, unsigned long bits);
 143
 144 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 145                    int bits, int filled);
 146 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 147                       int bits, gfp_t mask);
 148 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 149                      int bits, int wake, int delete, gfp_t mask);
 150 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 151                     int bits, gfp_t mask);
 152 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 153                         gfp_t mask);
 154 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 155                    gfp_t mask);
 156 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 157                      gfp_t mask);
 158 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 159                        gfp_t mask);
 160 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 161                        gfp_t mask);
 162 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
 163                                   u64 end, gfp_t mask);
 164 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 165                      gfp_t mask);
 166 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 167                      gfp_t mask);
 168 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 169                           u64 *start_ret, u64 *end_ret, int bits);
 170 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 171                                                  u64 start, int bits);
 172 int extent_invalidatepage(struct extent_io_tree *tree,
 173                           struct page *page, unsigned long offset);
 174 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 175                           get_extent_t *get_extent,
 176                           struct writeback_control *wbc);
 177 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 178                               u64 start, u64 end, get_extent_t *get_extent,
 179                               int mode);
 180 int extent_writepages(struct extent_io_tree *tree,
 181                       struct address_space *mapping,
 182                       get_extent_t *get_extent,
 183                       struct writeback_control *wbc);
 184 int extent_readpages(struct extent_io_tree *tree,
 185                      struct address_space *mapping,
 186                      struct list_head *pages, unsigned nr_pages,
 187                      get_extent_t get_extent);
 188 int extent_prepare_write(struct extent_io_tree *tree,
 189                          struct inode *inode, struct page *page,
 190                          unsigned from, unsigned to, get_extent_t *get_extent);
 191 int extent_commit_write(struct extent_io_tree *tree,
 192                         struct inode *inode, struct page *page,
 193                         unsigned from, unsigned to);
 194 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 195                 get_extent_t *get_extent);
 196 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 197 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 198 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 199 void set_page_extent_mapped(struct page *page);
 200
 201 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 202                                           u64 start, unsigned long len,
 203                                           struct page *page0,
 204                                           gfp_t mask);
 205 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 206                                          u64 start, unsigned long len,
 207                                           gfp_t mask);
 208 void free_extent_buffer(struct extent_buffer *eb);
 209 int read_extent_buffer_pages(struct extent_io_tree *tree,
 210                              struct extent_buffer *eb, u64 start, int wait,
 211                              get_extent_t *get_extent, int mirror_num);
 212
 213 static inline void extent_buffer_get(struct extent_buffer *eb)
 214 {
 215         atomic_inc(&eb->refs);
 216 }
 217
 218 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 219                           unsigned long start,
 220                           unsigned long len);
 221 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 222                         unsigned long start,
 223                         unsigned long len);
 224 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 225                          unsigned long start, unsigned long len);
 226 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 227                         unsigned long dst_offset, unsigned long src_offset,
 228                         unsigned long len);
 229 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 230                            unsigned long src_offset, unsigned long len);
 231 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 232                            unsigned long src_offset, unsigned long len);
 233 void memset_extent_buffer(struct extent_buffer *eb, char c,
 234                           unsigned long start, unsigned long len);
 235 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
 236                                     struct extent_buffer *eb);
 237 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
 238 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 239 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 240                               struct extent_buffer *eb);
 241 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 242                              struct extent_buffer *eb);
 243 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 244                                struct extent_buffer *eb);
 245 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 246                                 struct extent_buffer *eb);
 247 int extent_buffer_uptodate(struct extent_io_tree *tree,
 248                            struct extent_buffer *eb);
 249 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 250                       unsigned long min_len, char **token, char **map,
 251                       unsigned long *map_start,
 252                       unsigned long *map_len, int km);
 253 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 254                       unsigned long min_len, char **token, char **map,
 255                       unsigned long *map_start,
 256                       unsigned long *map_len, int km);
 257 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 258 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
 259 int extent_range_uptodate(struct extent_io_tree *tree,
 260                           u64 start, u64 end);
 261 int extent_clear_unlock_delalloc(struct inode *inode,
 262                                 struct extent_io_tree *tree,
 263                                 u64 start, u64 end, struct page *locked_page,
 264                                 int unlock_page,
 265                                 int clear_unlock,
 266                                 int clear_delalloc, int clear_dirty,
 267                                 int set_writeback,
 268                                 int end_writeback);
 269 #endif