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