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