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_DO_ACCOUNTING (1 << 11)
  19 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  20
  21 /* flags for bio submission */
  22 #define EXTENT_BIO_COMPRESSED 1
  23
  24 /* these are bit numbers for test/set bit */
  25 #define EXTENT_BUFFER_UPTODATE 0
  26 #define EXTENT_BUFFER_BLOCKING 1
  27 #define EXTENT_BUFFER_DIRTY 2
  28
  29 /* these are flags for extent_clear_unlock_delalloc */
  30 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  31 #define EXTENT_CLEAR_UNLOCK      0x2
  32 #define EXTENT_CLEAR_DELALLOC    0x4
  33 #define EXTENT_CLEAR_DIRTY       0x8
  34 #define EXTENT_SET_WRITEBACK     0x10
  35 #define EXTENT_END_WRITEBACK     0x20
  36 #define EXTENT_SET_PRIVATE2      0x40
  37 #define EXTENT_CLEAR_ACCOUNTING  0x80
  38
  39 /*
  40  * page->private values.  Every page that is controlled by the extent
  41  * map has page->private set to one.
  42  */
  43 #define EXTENT_PAGE_PRIVATE 1
  44 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  45
  46 struct extent_state;
  47
  48 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  49                                        struct bio *bio, int mirror_num,
  50                                        unsigned long bio_flags);
  51 struct extent_io_ops {
  52         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  53                              u64 start, u64 end, int *page_started,
  54                              unsigned long *nr_written);
  55         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  56         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  57         extent_submit_bio_hook_t *submit_bio_hook;
  58         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  59                               size_t size, struct bio *bio,
  60                               unsigned long bio_flags);
  61         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  62         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  63                                        u64 start, u64 end,
  64                                        struct extent_state *state);
  65         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  66                                         u64 start, u64 end,
  67                                        struct extent_state *state);
  68         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  69                                     struct extent_state *state);
  70         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  71                                       struct extent_state *state, int uptodate);
  72         int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
  73                             unsigned long old, unsigned long bits);
  74         int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  75                               unsigned long bits);
  76         int (*merge_extent_hook)(struct inode *inode,
  77                                  struct extent_state *new,
  78                                  struct extent_state *other);
  79         int (*split_extent_hook)(struct inode *inode,
  80                                  struct extent_state *orig, u64 split);
  81         int (*write_cache_pages_lock_hook)(struct page *page);
  82 };
  83
  84 struct extent_io_tree {
  85         struct rb_root state;
  86         struct rb_root buffer;
  87         struct address_space *mapping;
  88         u64 dirty_bytes;
  89         spinlock_t lock;
  90         spinlock_t buffer_lock;
  91         struct extent_io_ops *ops;
  92 };
  93
  94 struct extent_state {
  95         u64 start;
  96         u64 end; /* inclusive */
  97         struct rb_node rb_node;
  98
  99         /* ADD NEW ELEMENTS AFTER THIS */
 100         struct extent_io_tree *tree;
 101         wait_queue_head_t wq;
 102         atomic_t refs;
 103         unsigned long state;
 104         u64 split_start;
 105         u64 split_end;
 106
 107         /* for use by the FS */
 108         u64 private;
 109
 110         struct list_head leak_list;
 111 };
 112
 113 struct extent_buffer {
 114         u64 start;
 115         unsigned long len;
 116         char *map_token;
 117         char *kaddr;
 118         unsigned long map_start;
 119         unsigned long map_len;
 120         struct page *first_page;
 121         unsigned long bflags;
 122         atomic_t refs;
 123         struct list_head leak_list;
 124         struct rb_node rb_node;
 125
 126         /* the spinlock is used to protect most operations */
 127         spinlock_t lock;
 128
 129         /*
 130          * when we keep the lock held while blocking, waiters go onto
 131          * the wq
 132          */
 133         wait_queue_head_t lock_wq;
 134 };
 135
 136 struct extent_map_tree;
 137
 138 static inline struct extent_state *extent_state_next(struct extent_state *state)
 139 {
 140         struct rb_node *node;
 141         node = rb_next(&state->rb_node);
 142         if (!node)
 143                 return NULL;
 144         return rb_entry(node, struct extent_state, rb_node);
 145 }
 146
 147 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 148                                           struct page *page,
 149                                           size_t page_offset,
 150                                           u64 start, u64 len,
 151                                           int create);
 152
 153 void extent_io_tree_init(struct extent_io_tree *tree,
 154                           struct address_space *mapping, gfp_t mask);
 155 int try_release_extent_mapping(struct extent_map_tree *map,
 156                                struct extent_io_tree *tree, struct page *page,
 157                                gfp_t mask);
 158 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 159 int try_release_extent_state(struct extent_map_tree *map,
 160                              struct extent_io_tree *tree, struct page *page,
 161                              gfp_t mask);
 162 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 163 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 164                      int bits, struct extent_state **cached, gfp_t mask);
 165 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 166 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 167                          struct extent_state **cached, gfp_t mask);
 168 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 169                     gfp_t mask);
 170 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 171                           get_extent_t *get_extent);
 172 int __init extent_io_init(void);
 173 void extent_io_exit(void);
 174
 175 u64 count_range_bits(struct extent_io_tree *tree,
 176                      u64 *start, u64 search_end,
 177                      u64 max_bytes, unsigned long bits);
 178
 179 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 180                    int bits, int filled, struct extent_state *cached_state);
 181 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 182                       int bits, gfp_t mask);
 183 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 184                      int bits, int wake, int delete, struct extent_state **cached,
 185                      gfp_t mask);
 186 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 187                     int bits, gfp_t mask);
 188 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 189                         gfp_t mask);
 190 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 191                    gfp_t mask);
 192 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 193                      gfp_t mask);
 194 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 195                        gfp_t mask);
 196 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 197                        gfp_t mask);
 198 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
 199                                   u64 end, gfp_t mask);
 200 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 201                         struct extent_state **cached_state, gfp_t mask);
 202 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 203                      gfp_t mask);
 204 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 205                           u64 *start_ret, u64 *end_ret, int bits);
 206 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 207                                                  u64 start, int bits);
 208 int extent_invalidatepage(struct extent_io_tree *tree,
 209                           struct page *page, unsigned long offset);
 210 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 211                           get_extent_t *get_extent,
 212                           struct writeback_control *wbc);
 213 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 214                               u64 start, u64 end, get_extent_t *get_extent,
 215                               int mode);
 216 int extent_writepages(struct extent_io_tree *tree,
 217                       struct address_space *mapping,
 218                       get_extent_t *get_extent,
 219                       struct writeback_control *wbc);
 220 int extent_readpages(struct extent_io_tree *tree,
 221                      struct address_space *mapping,
 222                      struct list_head *pages, unsigned nr_pages,
 223                      get_extent_t get_extent);
 224 int extent_prepare_write(struct extent_io_tree *tree,
 225                          struct inode *inode, struct page *page,
 226                          unsigned from, unsigned to, get_extent_t *get_extent);
 227 int extent_commit_write(struct extent_io_tree *tree,
 228                         struct inode *inode, struct page *page,
 229                         unsigned from, unsigned to);
 230 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 231                 get_extent_t *get_extent);
 232 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 233                 __u64 start, __u64 len, get_extent_t *get_extent);
 234 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 235 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 236 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 237 void set_page_extent_mapped(struct page *page);
 238
 239 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 240                                           u64 start, unsigned long len,
 241                                           struct page *page0,
 242                                           gfp_t mask);
 243 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 244                                          u64 start, unsigned long len,
 245                                           gfp_t mask);
 246 void free_extent_buffer(struct extent_buffer *eb);
 247 int read_extent_buffer_pages(struct extent_io_tree *tree,
 248                              struct extent_buffer *eb, u64 start, int wait,
 249                              get_extent_t *get_extent, int mirror_num);
 250
 251 static inline void extent_buffer_get(struct extent_buffer *eb)
 252 {
 253         atomic_inc(&eb->refs);
 254 }
 255
 256 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 257                           unsigned long start,
 258                           unsigned long len);
 259 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 260                         unsigned long start,
 261                         unsigned long len);
 262 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 263                          unsigned long start, unsigned long len);
 264 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 265                         unsigned long dst_offset, unsigned long src_offset,
 266                         unsigned long len);
 267 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 268                            unsigned long src_offset, unsigned long len);
 269 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 270                            unsigned long src_offset, unsigned long len);
 271 void memset_extent_buffer(struct extent_buffer *eb, char c,
 272                           unsigned long start, unsigned long len);
 273 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
 274                                     struct extent_buffer *eb);
 275 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
 276 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 277 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 278                               struct extent_buffer *eb);
 279 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 280                              struct extent_buffer *eb);
 281 int test_extent_buffer_dirty(struct extent_io_tree *tree,
 282                              struct extent_buffer *eb);
 283 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 284                                struct extent_buffer *eb);
 285 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 286                                 struct extent_buffer *eb,
 287                                 struct extent_state **cached_state);
 288 int extent_buffer_uptodate(struct extent_io_tree *tree,
 289                            struct extent_buffer *eb,
 290                            struct extent_state *cached_state);
 291 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 292                       unsigned long min_len, char **token, char **map,
 293                       unsigned long *map_start,
 294                       unsigned long *map_len, int km);
 295 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 296                       unsigned long min_len, char **token, char **map,
 297                       unsigned long *map_start,
 298                       unsigned long *map_len, int km);
 299 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 300 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
 301 int extent_range_uptodate(struct extent_io_tree *tree,
 302                           u64 start, u64 end);
 303 int extent_clear_unlock_delalloc(struct inode *inode,
 304                                 struct extent_io_tree *tree,
 305                                 u64 start, u64 end, struct page *locked_page,
 306                                 unsigned long op);
 307 #endif