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_BOUNDARY (1 << 9)
  17 #define EXTENT_NODATASUM (1 << 10)
  18 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  19
  20 /* flags for bio submission */
  21 #define EXTENT_BIO_COMPRESSED 1
  22
  23 /* these are bit numbers for test/set bit */
  24 #define EXTENT_BUFFER_UPTODATE 0
  25 #define EXTENT_BUFFER_BLOCKING 1
  26 #define EXTENT_BUFFER_DIRTY 2
  27
  28 /*
  29  * page->private values.  Every page that is controlled by the extent
  30  * map has page->private set to one.
  31  */
  32 #define EXTENT_PAGE_PRIVATE 1
  33 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  34
  35 struct extent_state;
  36
  37 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  38                                        struct bio *bio, int mirror_num,
  39                                        unsigned long bio_flags);
  40 struct extent_io_ops {
  41         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  42                              u64 start, u64 end, int *page_started,
  43                              unsigned long *nr_written);
  44         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  45         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  46         extent_submit_bio_hook_t *submit_bio_hook;
  47         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  48                               size_t size, struct bio *bio,
  49                               unsigned long bio_flags);
  50         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  51         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  52                                        u64 start, u64 end,
  53                                        struct extent_state *state);
  54         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  55                                         u64 start, u64 end,
  56                                        struct extent_state *state);
  57         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  58                                     struct extent_state *state);
  59         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  60                                       struct extent_state *state, int uptodate);
  61         int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
  62                             unsigned long old, unsigned long bits);
  63         int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  64                               unsigned long bits);
  65         int (*merge_extent_hook)(struct inode *inode,
  66                                  struct extent_state *new,
  67                                  struct extent_state *other);
  68         int (*split_extent_hook)(struct inode *inode,
  69                                  struct extent_state *orig, u64 split);
  70         int (*write_cache_pages_lock_hook)(struct page *page);
  71 };
  72
  73 struct extent_io_tree {
  74         struct rb_root state;
  75         struct rb_root buffer;
  76         struct address_space *mapping;
  77         u64 dirty_bytes;
  78         spinlock_t lock;
  79         spinlock_t buffer_lock;
  80         struct extent_io_ops *ops;
  81 };
  82
  83 struct extent_state {
  84         u64 start;
  85         u64 end; /* inclusive */
  86         struct rb_node rb_node;
  87
  88         /* ADD NEW ELEMENTS AFTER THIS */
  89         struct extent_io_tree *tree;
  90         wait_queue_head_t wq;
  91         atomic_t refs;
  92         unsigned long state;
  93         u64 split_start;
  94         u64 split_end;
  95
  96         /* for use by the FS */
  97         u64 private;
  98
  99         struct list_head leak_list;
 100 };
 101
 102 struct extent_buffer {
 103         u64 start;
 104         unsigned long len;
 105         char *map_token;
 106         char *kaddr;
 107         unsigned long map_start;
 108         unsigned long map_len;
 109         struct page *first_page;
 110         unsigned long bflags;
 111         atomic_t refs;
 112         struct list_head leak_list;
 113         struct rb_node rb_node;
 114
 115         /* the spinlock is used to protect most operations */
 116         spinlock_t lock;
 117
 118         /*
 119          * when we keep the lock held while blocking, waiters go onto
 120          * the wq
 121          */
 122         wait_queue_head_t lock_wq;
 123 };
 124
 125 struct extent_map_tree;
 126
 127 static inline struct extent_state *extent_state_next(struct extent_state *state)
 128 {
 129         struct rb_node *node;
 130         node = rb_next(&state->rb_node);
 131         if (!node)
 132                 return NULL;
 133         return rb_entry(node, struct extent_state, rb_node);
 134 }
 135
 136 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 137                                           struct page *page,
 138                                           size_t page_offset,
 139                                           u64 start, u64 len,
 140                                           int create);
 141
 142 void extent_io_tree_init(struct extent_io_tree *tree,
 143                           struct address_space *mapping, gfp_t mask);
 144 int try_release_extent_mapping(struct extent_map_tree *map,
 145                                struct extent_io_tree *tree, struct page *page,
 146                                gfp_t mask);
 147 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 148 int try_release_extent_state(struct extent_map_tree *map,
 149                              struct extent_io_tree *tree, struct page *page,
 150                              gfp_t mask);
 151 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 152 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 153                      int bits, struct extent_state **cached, gfp_t mask);
 154 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 155 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 156                     gfp_t mask);
 157 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 158                           get_extent_t *get_extent);
 159 int __init extent_io_init(void);
 160 void extent_io_exit(void);
 161
 162 u64 count_range_bits(struct extent_io_tree *tree,
 163                      u64 *start, u64 search_end,
 164                      u64 max_bytes, unsigned long bits);
 165
 166 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 167                    int bits, int filled, struct extent_state *cached_state);
 168 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 169                       int bits, gfp_t mask);
 170 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 171                      int bits, int wake, int delete, struct extent_state **cached,
 172                      gfp_t mask);
 173 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 174                     int bits, gfp_t mask);
 175 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 176                         gfp_t mask);
 177 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 178                    gfp_t mask);
 179 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 180                      gfp_t mask);
 181 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 182                        gfp_t mask);
 183 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 184                        gfp_t mask);
 185 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
 186                                   u64 end, gfp_t mask);
 187 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 188                      gfp_t mask);
 189 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 190                      gfp_t mask);
 191 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 192                           u64 *start_ret, u64 *end_ret, int bits);
 193 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 194                                                  u64 start, int bits);
 195 int extent_invalidatepage(struct extent_io_tree *tree,
 196                           struct page *page, unsigned long offset);
 197 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 198                           get_extent_t *get_extent,
 199                           struct writeback_control *wbc);
 200 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 201                               u64 start, u64 end, get_extent_t *get_extent,
 202                               int mode);
 203 int extent_writepages(struct extent_io_tree *tree,
 204                       struct address_space *mapping,
 205                       get_extent_t *get_extent,
 206                       struct writeback_control *wbc);
 207 int extent_readpages(struct extent_io_tree *tree,
 208                      struct address_space *mapping,
 209                      struct list_head *pages, unsigned nr_pages,
 210                      get_extent_t get_extent);
 211 int extent_prepare_write(struct extent_io_tree *tree,
 212                          struct inode *inode, struct page *page,
 213                          unsigned from, unsigned to, get_extent_t *get_extent);
 214 int extent_commit_write(struct extent_io_tree *tree,
 215                         struct inode *inode, struct page *page,
 216                         unsigned from, unsigned to);
 217 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 218                 get_extent_t *get_extent);
 219 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 220                 __u64 start, __u64 len, get_extent_t *get_extent);
 221 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 222 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 223 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 224 void set_page_extent_mapped(struct page *page);
 225
 226 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 227                                           u64 start, unsigned long len,
 228                                           struct page *page0,
 229                                           gfp_t mask);
 230 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 231                                          u64 start, unsigned long len,
 232                                           gfp_t mask);
 233 void free_extent_buffer(struct extent_buffer *eb);
 234 int read_extent_buffer_pages(struct extent_io_tree *tree,
 235                              struct extent_buffer *eb, u64 start, int wait,
 236                              get_extent_t *get_extent, int mirror_num);
 237
 238 static inline void extent_buffer_get(struct extent_buffer *eb)
 239 {
 240         atomic_inc(&eb->refs);
 241 }
 242
 243 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 244                           unsigned long start,
 245                           unsigned long len);
 246 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 247                         unsigned long start,
 248                         unsigned long len);
 249 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 250                          unsigned long start, unsigned long len);
 251 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 252                         unsigned long dst_offset, unsigned long src_offset,
 253                         unsigned long len);
 254 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 255                            unsigned long src_offset, unsigned long len);
 256 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 257                            unsigned long src_offset, unsigned long len);
 258 void memset_extent_buffer(struct extent_buffer *eb, char c,
 259                           unsigned long start, unsigned long len);
 260 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
 261                                     struct extent_buffer *eb);
 262 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
 263 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 264 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 265                               struct extent_buffer *eb);
 266 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 267                              struct extent_buffer *eb);
 268 int test_extent_buffer_dirty(struct extent_io_tree *tree,
 269                              struct extent_buffer *eb);
 270 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 271                                struct extent_buffer *eb);
 272 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 273                                 struct extent_buffer *eb);
 274 int extent_buffer_uptodate(struct extent_io_tree *tree,
 275                            struct extent_buffer *eb);
 276 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 277                       unsigned long min_len, char **token, char **map,
 278                       unsigned long *map_start,
 279                       unsigned long *map_len, int km);
 280 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 281                       unsigned long min_len, char **token, char **map,
 282                       unsigned long *map_start,
 283                       unsigned long *map_len, int km);
 284 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 285 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
 286 int extent_range_uptodate(struct extent_io_tree *tree,
 287                           u64 start, u64 end);
 288 int extent_clear_unlock_delalloc(struct inode *inode,
 289                                 struct extent_io_tree *tree,
 290                                 u64 start, u64 end, struct page *locked_page,
 291                                 int unlock_page,
 292                                 int clear_unlock,
 293                                 int clear_delalloc, int clear_dirty,
 294                                 int set_writeback,
 295                                 int end_writeback,
 296                                 int set_private2);
 297 #endif