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_FIRST_DELALLOC (1 << 12)
  20 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  21 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
  22
  23 /*
  24  * flags for bio submission. The high bits indicate the compression
  25  * type for this bio
  26  */
  27 #define EXTENT_BIO_COMPRESSED 1
  28 #define EXTENT_BIO_FLAG_SHIFT 16
  29
  30 /* these are bit numbers for test/set bit */
  31 #define EXTENT_BUFFER_UPTODATE 0
  32 #define EXTENT_BUFFER_BLOCKING 1
  33 #define EXTENT_BUFFER_DIRTY 2
  34
  35 /* these are flags for extent_clear_unlock_delalloc */
  36 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  37 #define EXTENT_CLEAR_UNLOCK      0x2
  38 #define EXTENT_CLEAR_DELALLOC    0x4
  39 #define EXTENT_CLEAR_DIRTY       0x8
  40 #define EXTENT_SET_WRITEBACK     0x10
  41 #define EXTENT_END_WRITEBACK     0x20
  42 #define EXTENT_SET_PRIVATE2      0x40
  43 #define EXTENT_CLEAR_ACCOUNTING  0x80
  44
  45 /*
  46  * page->private values.  Every page that is controlled by the extent
  47  * map has page->private set to one.
  48  */
  49 #define EXTENT_PAGE_PRIVATE 1
  50 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  51
  52 struct extent_state;
  53
  54 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  55                                        struct bio *bio, int mirror_num,
  56                                        unsigned long bio_flags, u64 bio_offset);
  57 struct extent_io_ops {
  58         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  59                              u64 start, u64 end, int *page_started,
  60                              unsigned long *nr_written);
  61         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  62         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  63         extent_submit_bio_hook_t *submit_bio_hook;
  64         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  65                               size_t size, struct bio *bio,
  66                               unsigned long bio_flags);
  67         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  68         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  69                                        u64 start, u64 end,
  70                                        struct extent_state *state);
  71         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  72                                         u64 start, u64 end,
  73                                        struct extent_state *state);
  74         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  75                                     struct extent_state *state);
  76         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  77                                       struct extent_state *state, int uptodate);
  78         int (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  79                             int *bits);
  80         int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  81                               int *bits);
  82         int (*merge_extent_hook)(struct inode *inode,
  83                                  struct extent_state *new,
  84                                  struct extent_state *other);
  85         int (*split_extent_hook)(struct inode *inode,
  86                                  struct extent_state *orig, u64 split);
  87         int (*write_cache_pages_lock_hook)(struct page *page);
  88 };
  89
  90 struct extent_io_tree {
  91         struct rb_root state;
  92         struct radix_tree_root buffer;
  93         struct address_space *mapping;
  94         u64 dirty_bytes;
  95         spinlock_t lock;
  96         spinlock_t buffer_lock;
  97         struct extent_io_ops *ops;
  98 };
  99
 100 struct extent_state {
 101         u64 start;
 102         u64 end; /* inclusive */
 103         struct rb_node rb_node;
 104
 105         /* ADD NEW ELEMENTS AFTER THIS */
 106         struct extent_io_tree *tree;
 107         wait_queue_head_t wq;
 108         atomic_t refs;
 109         unsigned long state;
 110         u64 split_start;
 111         u64 split_end;
 112
 113         /* for use by the FS */
 114         u64 private;
 115
 116         struct list_head leak_list;
 117 };
 118
 119 struct extent_buffer {
 120         u64 start;
 121         unsigned long len;
 122         char *map_token;
 123         char *kaddr;
 124         unsigned long map_start;
 125         unsigned long map_len;
 126         struct page *first_page;
 127         unsigned long bflags;
 128         atomic_t refs;
 129         struct list_head leak_list;
 130         struct rcu_head rcu_head;
 131
 132         /* the spinlock is used to protect most operations */
 133         spinlock_t lock;
 134
 135         /*
 136          * when we keep the lock held while blocking, waiters go onto
 137          * the wq
 138          */
 139         wait_queue_head_t lock_wq;
 140 };
 141
 142 static inline void extent_set_compress_type(unsigned long *bio_flags,
 143                                             int compress_type)
 144 {
 145         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 146 }
 147
 148 static inline int extent_compress_type(unsigned long bio_flags)
 149 {
 150         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 151 }
 152
 153 struct extent_map_tree;
 154
 155 static inline struct extent_state *extent_state_next(struct extent_state *state)
 156 {
 157         struct rb_node *node;
 158         node = rb_next(&state->rb_node);
 159         if (!node)
 160                 return NULL;
 161         return rb_entry(node, struct extent_state, rb_node);
 162 }
 163
 164 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 165                                           struct page *page,
 166                                           size_t page_offset,
 167                                           u64 start, u64 len,
 168                                           int create);
 169
 170 void extent_io_tree_init(struct extent_io_tree *tree,
 171                           struct address_space *mapping, gfp_t mask);
 172 int try_release_extent_mapping(struct extent_map_tree *map,
 173                                struct extent_io_tree *tree, struct page *page,
 174                                gfp_t mask);
 175 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 176 int try_release_extent_state(struct extent_map_tree *map,
 177                              struct extent_io_tree *tree, struct page *page,
 178                              gfp_t mask);
 179 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 180 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 181                      int bits, struct extent_state **cached, gfp_t mask);
 182 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 183 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 184                          struct extent_state **cached, gfp_t mask);
 185 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 186                     gfp_t mask);
 187 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 188                           get_extent_t *get_extent);
 189 int __init extent_io_init(void);
 190 void extent_io_exit(void);
 191
 192 u64 count_range_bits(struct extent_io_tree *tree,
 193                      u64 *start, u64 search_end,
 194                      u64 max_bytes, unsigned long bits, int contig);
 195
 196 void free_extent_state(struct extent_state *state);
 197 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 198                    int bits, int filled, struct extent_state *cached_state);
 199 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 200                       int bits, gfp_t mask);
 201 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 202                      int bits, int wake, int delete, struct extent_state **cached,
 203                      gfp_t mask);
 204 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 205                     int bits, gfp_t mask);
 206 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 207                    int bits, int exclusive_bits, u64 *failed_start,
 208                    struct extent_state **cached_state, gfp_t mask);
 209 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 210                         gfp_t mask);
 211 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 212                    gfp_t mask);
 213 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 214                      gfp_t mask);
 215 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 216                        gfp_t mask);
 217 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 218                        gfp_t mask);
 219 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
 220                                   u64 end, gfp_t mask);
 221 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 222                         struct extent_state **cached_state, gfp_t mask);
 223 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 224                      gfp_t mask);
 225 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 226                           u64 *start_ret, u64 *end_ret, int bits);
 227 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 228                                                  u64 start, int bits);
 229 int extent_invalidatepage(struct extent_io_tree *tree,
 230                           struct page *page, unsigned long offset);
 231 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 232                           get_extent_t *get_extent,
 233                           struct writeback_control *wbc);
 234 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 235                               u64 start, u64 end, get_extent_t *get_extent,
 236                               int mode);
 237 int extent_writepages(struct extent_io_tree *tree,
 238                       struct address_space *mapping,
 239                       get_extent_t *get_extent,
 240                       struct writeback_control *wbc);
 241 int extent_readpages(struct extent_io_tree *tree,
 242                      struct address_space *mapping,
 243                      struct list_head *pages, unsigned nr_pages,
 244                      get_extent_t get_extent);
 245 int extent_prepare_write(struct extent_io_tree *tree,
 246                          struct inode *inode, struct page *page,
 247                          unsigned from, unsigned to, get_extent_t *get_extent);
 248 int extent_commit_write(struct extent_io_tree *tree,
 249                         struct inode *inode, struct page *page,
 250                         unsigned from, unsigned to);
 251 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 252                 get_extent_t *get_extent);
 253 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 254                 __u64 start, __u64 len, get_extent_t *get_extent);
 255 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 256 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 257 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 258 void set_page_extent_mapped(struct page *page);
 259
 260 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 261                                           u64 start, unsigned long len,
 262                                           struct page *page0,
 263                                           gfp_t mask);
 264 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 265                                          u64 start, unsigned long len,
 266                                           gfp_t mask);
 267 void free_extent_buffer(struct extent_buffer *eb);
 268 int read_extent_buffer_pages(struct extent_io_tree *tree,
 269                              struct extent_buffer *eb, u64 start, int wait,
 270                              get_extent_t *get_extent, int mirror_num);
 271
 272 static inline void extent_buffer_get(struct extent_buffer *eb)
 273 {
 274         atomic_inc(&eb->refs);
 275 }
 276
 277 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 278                           unsigned long start,
 279                           unsigned long len);
 280 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 281                         unsigned long start,
 282                         unsigned long len);
 283 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 284                          unsigned long start, unsigned long len);
 285 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 286                         unsigned long dst_offset, unsigned long src_offset,
 287                         unsigned long len);
 288 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 289                            unsigned long src_offset, unsigned long len);
 290 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 291                            unsigned long src_offset, unsigned long len);
 292 void memset_extent_buffer(struct extent_buffer *eb, char c,
 293                           unsigned long start, unsigned long len);
 294 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
 295                                     struct extent_buffer *eb);
 296 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
 297 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 298 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 299                               struct extent_buffer *eb);
 300 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 301                              struct extent_buffer *eb);
 302 int test_extent_buffer_dirty(struct extent_io_tree *tree,
 303                              struct extent_buffer *eb);
 304 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 305                                struct extent_buffer *eb);
 306 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 307                                 struct extent_buffer *eb,
 308                                 struct extent_state **cached_state);
 309 int extent_buffer_uptodate(struct extent_io_tree *tree,
 310                            struct extent_buffer *eb,
 311                            struct extent_state *cached_state);
 312 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 313                       unsigned long min_len, char **token, char **map,
 314                       unsigned long *map_start,
 315                       unsigned long *map_len, int km);
 316 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 317                       unsigned long min_len, char **token, char **map,
 318                       unsigned long *map_start,
 319                       unsigned long *map_len, int km);
 320 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 321 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
 322 int extent_range_uptodate(struct extent_io_tree *tree,
 323                           u64 start, u64 end);
 324 int extent_clear_unlock_delalloc(struct inode *inode,
 325                                 struct extent_io_tree *tree,
 326                                 u64 start, u64 end, struct page *locked_page,
 327                                 unsigned long op);
 328 struct bio *
 329 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 330                 gfp_t gfp_flags);
 331 #endif