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_NEED_WAIT (1 << 13)
  21 #define EXTENT_DAMAGED (1 << 14)
  22 #define EXTENT_NORESERVE (1 << 15)
  23 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  24 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
  25
  26 /*
  27  * flags for bio submission. The high bits indicate the compression
  28  * type for this bio
  29  */
  30 #define EXTENT_BIO_COMPRESSED 1
  31 #define EXTENT_BIO_TREE_LOG 2
  32 #define EXTENT_BIO_PARENT_LOCKED 4
  33 #define EXTENT_BIO_FLAG_SHIFT 16
  34
  35 /* these are bit numbers for test/set bit */
  36 #define EXTENT_BUFFER_UPTODATE 0
  37 #define EXTENT_BUFFER_BLOCKING 1
  38 #define EXTENT_BUFFER_DIRTY 2
  39 #define EXTENT_BUFFER_CORRUPT 3
  40 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
  41 #define EXTENT_BUFFER_TREE_REF 5
  42 #define EXTENT_BUFFER_STALE 6
  43 #define EXTENT_BUFFER_WRITEBACK 7
  44 #define EXTENT_BUFFER_IOERR 8
  45 #define EXTENT_BUFFER_DUMMY 9
  46
  47 /* these are flags for extent_clear_unlock_delalloc */
  48 #define PAGE_UNLOCK             (1 << 0)
  49 #define PAGE_CLEAR_DIRTY        (1 << 1)
  50 #define PAGE_SET_WRITEBACK      (1 << 2)
  51 #define PAGE_END_WRITEBACK      (1 << 3)
  52 #define PAGE_SET_PRIVATE2       (1 << 4)
  53
  54 /*
  55  * page->private values.  Every page that is controlled by the extent
  56  * map has page->private set to one.
  57  */
  58 #define EXTENT_PAGE_PRIVATE 1
  59 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  60
  61 struct extent_state;
  62 struct btrfs_root;
  63 struct btrfs_io_bio;
  64
  65 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  66                                        struct bio *bio, int mirror_num,
  67                                        unsigned long bio_flags, u64 bio_offset);
  68 struct extent_io_ops {
  69         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  70                              u64 start, u64 end, int *page_started,
  71                              unsigned long *nr_written);
  72         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  73         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  74         extent_submit_bio_hook_t *submit_bio_hook;
  75         int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
  76                               size_t size, struct bio *bio,
  77                               unsigned long bio_flags);
  78         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
  79         int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
  80                                     struct page *page, u64 start, u64 end,
  81                                     int mirror);
  82         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  83                                       struct extent_state *state, int uptodate);
  84         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  85                              unsigned long *bits);
  86         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  87                                unsigned long *bits);
  88         void (*merge_extent_hook)(struct inode *inode,
  89                                   struct extent_state *new,
  90                                   struct extent_state *other);
  91         void (*split_extent_hook)(struct inode *inode,
  92                                   struct extent_state *orig, u64 split);
  93 };
  94
  95 struct extent_io_tree {
  96         struct rb_root state;
  97         struct radix_tree_root buffer;
  98         struct address_space *mapping;
  99         u64 dirty_bytes;
 100         int track_uptodate;
 101         spinlock_t lock;
 102         spinlock_t buffer_lock;
 103         struct extent_io_ops *ops;
 104 };
 105
 106 struct extent_state {
 107         u64 start;
 108         u64 end; /* inclusive */
 109         struct rb_node rb_node;
 110
 111         /* ADD NEW ELEMENTS AFTER THIS */
 112         struct extent_io_tree *tree;
 113         wait_queue_head_t wq;
 114         atomic_t refs;
 115         unsigned long state;
 116
 117         /* for use by the FS */
 118         u64 private;
 119
 120 #ifdef CONFIG_BTRFS_DEBUG
 121         struct list_head leak_list;
 122 #endif
 123 };
 124
 125 #define INLINE_EXTENT_BUFFER_PAGES 16
 126 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
 127 struct extent_buffer {
 128         u64 start;
 129         unsigned long len;
 130         unsigned long map_start;
 131         unsigned long map_len;
 132         unsigned long bflags;
 133         struct extent_io_tree *tree;
 134         spinlock_t refs_lock;
 135         atomic_t refs;
 136         atomic_t io_pages;
 137         int read_mirror;
 138         struct rcu_head rcu_head;
 139         pid_t lock_owner;
 140
 141         /* count of read lock holders on the extent buffer */
 142         atomic_t write_locks;
 143         atomic_t read_locks;
 144         atomic_t blocking_writers;
 145         atomic_t blocking_readers;
 146         atomic_t spinning_readers;
 147         atomic_t spinning_writers;
 148         int lock_nested;
 149
 150         /* protects write locks */
 151         rwlock_t lock;
 152
 153         /* readers use lock_wq while they wait for the write
 154          * lock holders to unlock
 155          */
 156         wait_queue_head_t write_lock_wq;
 157
 158         /* writers use read_lock_wq while they wait for readers
 159          * to unlock
 160          */
 161         wait_queue_head_t read_lock_wq;
 162         wait_queue_head_t lock_wq;
 163         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 164 #ifdef CONFIG_BTRFS_DEBUG
 165         struct list_head leak_list;
 166 #endif
 167 };
 168
 169 static inline void extent_set_compress_type(unsigned long *bio_flags,
 170                                             int compress_type)
 171 {
 172         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 173 }
 174
 175 static inline int extent_compress_type(unsigned long bio_flags)
 176 {
 177         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 178 }
 179
 180 struct extent_map_tree;
 181
 182 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 183                                           struct page *page,
 184                                           size_t pg_offset,
 185                                           u64 start, u64 len,
 186                                           int create);
 187
 188 void extent_io_tree_init(struct extent_io_tree *tree,
 189                          struct address_space *mapping);
 190 int try_release_extent_mapping(struct extent_map_tree *map,
 191                                struct extent_io_tree *tree, struct page *page,
 192                                gfp_t mask);
 193 int try_release_extent_buffer(struct page *page);
 194 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 195 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 196                      unsigned long bits, struct extent_state **cached);
 197 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 198 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 199                          struct extent_state **cached, gfp_t mask);
 200 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 201 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 202                           get_extent_t *get_extent, int mirror_num);
 203 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
 204                                  get_extent_t *get_extent, int mirror_num);
 205 int __init extent_io_init(void);
 206 void extent_io_exit(void);
 207
 208 u64 count_range_bits(struct extent_io_tree *tree,
 209                      u64 *start, u64 search_end,
 210                      u64 max_bytes, unsigned long bits, int contig);
 211
 212 void free_extent_state(struct extent_state *state);
 213 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 214                    unsigned long bits, int filled,
 215                    struct extent_state *cached_state);
 216 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 217                       unsigned long bits, gfp_t mask);
 218 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 219                      unsigned long bits, int wake, int delete,
 220                      struct extent_state **cached, gfp_t mask);
 221 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 222                     unsigned long bits, gfp_t mask);
 223 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 224                    unsigned long bits, u64 *failed_start,
 225                    struct extent_state **cached_state, gfp_t mask);
 226 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 227                         struct extent_state **cached_state, gfp_t mask);
 228 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 229                           struct extent_state **cached_state, gfp_t mask);
 230 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 231                    gfp_t mask);
 232 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 233                      gfp_t mask);
 234 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 235                        gfp_t mask);
 236 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 237                        unsigned long bits, unsigned long clear_bits,
 238                        struct extent_state **cached_state, gfp_t mask);
 239 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 240                         struct extent_state **cached_state, gfp_t mask);
 241 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
 242                       struct extent_state **cached_state, gfp_t mask);
 243 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 244                           u64 *start_ret, u64 *end_ret, unsigned long bits,
 245                           struct extent_state **cached_state);
 246 int extent_invalidatepage(struct extent_io_tree *tree,
 247                           struct page *page, unsigned long offset);
 248 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 249                           get_extent_t *get_extent,
 250                           struct writeback_control *wbc);
 251 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 252                               u64 start, u64 end, get_extent_t *get_extent,
 253                               int mode);
 254 int extent_writepages(struct extent_io_tree *tree,
 255                       struct address_space *mapping,
 256                       get_extent_t *get_extent,
 257                       struct writeback_control *wbc);
 258 int btree_write_cache_pages(struct address_space *mapping,
 259                             struct writeback_control *wbc);
 260 int extent_readpages(struct extent_io_tree *tree,
 261                      struct address_space *mapping,
 262                      struct list_head *pages, unsigned nr_pages,
 263                      get_extent_t get_extent);
 264 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 265                 __u64 start, __u64 len, get_extent_t *get_extent);
 266 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 267 void set_page_extent_mapped(struct page *page);
 268
 269 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 270                                           u64 start, unsigned long len);
 271 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 272 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 273 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 274                                          u64 start, unsigned long len);
 275 void free_extent_buffer(struct extent_buffer *eb);
 276 void free_extent_buffer_stale(struct extent_buffer *eb);
 277 #define WAIT_NONE       0
 278 #define WAIT_COMPLETE   1
 279 #define WAIT_PAGE_LOCK  2
 280 int read_extent_buffer_pages(struct extent_io_tree *tree,
 281                              struct extent_buffer *eb, u64 start, int wait,
 282                              get_extent_t *get_extent, int mirror_num);
 283 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 284
 285 static inline unsigned long num_extent_pages(u64 start, u64 len)
 286 {
 287         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
 288                 (start >> PAGE_CACHE_SHIFT);
 289 }
 290
 291 static inline struct page *extent_buffer_page(struct extent_buffer *eb,
 292                                               unsigned long i)
 293 {
 294         return eb->pages[i];
 295 }
 296
 297 static inline void extent_buffer_get(struct extent_buffer *eb)
 298 {
 299         atomic_inc(&eb->refs);
 300 }
 301
 302 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 303                           unsigned long start,
 304                           unsigned long len);
 305 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 306                         unsigned long start,
 307                         unsigned long len);
 308 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 309                          unsigned long start, unsigned long len);
 310 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 311                         unsigned long dst_offset, unsigned long src_offset,
 312                         unsigned long len);
 313 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 314                            unsigned long src_offset, unsigned long len);
 315 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 316                            unsigned long src_offset, unsigned long len);
 317 void memset_extent_buffer(struct extent_buffer *eb, char c,
 318                           unsigned long start, unsigned long len);
 319 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 320 int set_extent_buffer_dirty(struct extent_buffer *eb);
 321 int set_extent_buffer_uptodate(struct extent_buffer *eb);
 322 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 323 int extent_buffer_uptodate(struct extent_buffer *eb);
 324 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 325                       unsigned long min_len, char **map,
 326                       unsigned long *map_start,
 327                       unsigned long *map_len);
 328 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 329 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
 330 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
 331                                  struct page *locked_page,
 332                                  unsigned long bits_to_clear,
 333                                  unsigned long page_ops);
 334 struct bio *
 335 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 336                 gfp_t gfp_flags);
 337 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
 338 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
 339
 340 struct btrfs_fs_info;
 341
 342 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
 343                         u64 length, u64 logical, struct page *page,
 344                         int mirror_num);
 345 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 346 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 347                          int mirror_num);
 348 #endif