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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  23 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
  24
  25 /*
  26  * flags for bio submission. The high bits indicate the compression
  27  * type for this bio
  28  */
  29 #define EXTENT_BIO_COMPRESSED 1
  30 #define EXTENT_BIO_TREE_LOG 2
  31 #define EXTENT_BIO_FLAG_SHIFT 16
  32
  33 /* these are bit numbers for test/set bit */
  34 #define EXTENT_BUFFER_UPTODATE 0
  35 #define EXTENT_BUFFER_BLOCKING 1
  36 #define EXTENT_BUFFER_DIRTY 2
  37 #define EXTENT_BUFFER_CORRUPT 3
  38 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
  39 #define EXTENT_BUFFER_TREE_REF 5
  40 #define EXTENT_BUFFER_STALE 6
  41 #define EXTENT_BUFFER_WRITEBACK 7
  42 #define EXTENT_BUFFER_IOERR 8
  43 #define EXTENT_BUFFER_DUMMY 9
  44
  45 /* these are flags for extent_clear_unlock_delalloc */
  46 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  47 #define EXTENT_CLEAR_UNLOCK      0x2
  48 #define EXTENT_CLEAR_DELALLOC    0x4
  49 #define EXTENT_CLEAR_DIRTY       0x8
  50 #define EXTENT_SET_WRITEBACK     0x10
  51 #define EXTENT_END_WRITEBACK     0x20
  52 #define EXTENT_SET_PRIVATE2      0x40
  53 #define EXTENT_CLEAR_ACCOUNTING  0x80
  54
  55 /*
  56  * page->private values.  Every page that is controlled by the extent
  57  * map has page->private set to one.
  58  */
  59 #define EXTENT_PAGE_PRIVATE 1
  60 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  61
  62 struct extent_state;
  63 struct btrfs_root;
  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 page *page, u64 start, u64 end,
  80                                     struct extent_state *state, int mirror);
  81         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  82                                       struct extent_state *state, int uptodate);
  83         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  84                              int *bits);
  85         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  86                                int *bits);
  87         void (*merge_extent_hook)(struct inode *inode,
  88                                   struct extent_state *new,
  89                                   struct extent_state *other);
  90         void (*split_extent_hook)(struct inode *inode,
  91                                   struct extent_state *orig, u64 split);
  92 };
  93
  94 struct extent_io_tree {
  95         struct rb_root state;
  96         struct radix_tree_root buffer;
  97         struct address_space *mapping;
  98         u64 dirty_bytes;
  99         int track_uptodate;
 100         spinlock_t lock;
 101         spinlock_t buffer_lock;
 102         struct extent_io_ops *ops;
 103 };
 104
 105 struct extent_state {
 106         u64 start;
 107         u64 end; /* inclusive */
 108         struct rb_node rb_node;
 109
 110         /* ADD NEW ELEMENTS AFTER THIS */
 111         struct extent_io_tree *tree;
 112         wait_queue_head_t wq;
 113         atomic_t refs;
 114         unsigned long state;
 115
 116         /* for use by the FS */
 117         u64 private;
 118
 119         struct list_head leak_list;
 120 };
 121
 122 #define INLINE_EXTENT_BUFFER_PAGES 16
 123 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
 124 struct extent_buffer {
 125         u64 start;
 126         unsigned long len;
 127         unsigned long map_start;
 128         unsigned long map_len;
 129         unsigned long bflags;
 130         struct extent_io_tree *tree;
 131         spinlock_t refs_lock;
 132         atomic_t refs;
 133         atomic_t io_pages;
 134         int read_mirror;
 135         struct list_head leak_list;
 136         struct rcu_head rcu_head;
 137         pid_t lock_owner;
 138
 139         /* count of read lock holders on the extent buffer */
 140         atomic_t write_locks;
 141         atomic_t read_locks;
 142         atomic_t blocking_writers;
 143         atomic_t blocking_readers;
 144         atomic_t spinning_readers;
 145         atomic_t spinning_writers;
 146         int lock_nested;
 147
 148         /* protects write locks */
 149         rwlock_t lock;
 150
 151         /* readers use lock_wq while they wait for the write
 152          * lock holders to unlock
 153          */
 154         wait_queue_head_t write_lock_wq;
 155
 156         /* writers use read_lock_wq while they wait for readers
 157          * to unlock
 158          */
 159         wait_queue_head_t read_lock_wq;
 160         wait_queue_head_t lock_wq;
 161         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 162 };
 163
 164 static inline void extent_set_compress_type(unsigned long *bio_flags,
 165                                             int compress_type)
 166 {
 167         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 168 }
 169
 170 static inline int extent_compress_type(unsigned long bio_flags)
 171 {
 172         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 173 }
 174
 175 struct extent_map_tree;
 176
 177 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 178                                           struct page *page,
 179                                           size_t pg_offset,
 180                                           u64 start, u64 len,
 181                                           int create);
 182
 183 void extent_io_tree_init(struct extent_io_tree *tree,
 184                          struct address_space *mapping);
 185 int try_release_extent_mapping(struct extent_map_tree *map,
 186                                struct extent_io_tree *tree, struct page *page,
 187                                gfp_t mask);
 188 int try_release_extent_buffer(struct page *page, gfp_t mask);
 189 int try_release_extent_state(struct extent_map_tree *map,
 190                              struct extent_io_tree *tree, struct page *page,
 191                              gfp_t mask);
 192 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 193 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 194                      int bits, struct extent_state **cached);
 195 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 196 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 197                          struct extent_state **cached, gfp_t mask);
 198 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 199 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 200                           get_extent_t *get_extent, int mirror_num);
 201 int __init extent_io_init(void);
 202 void extent_io_exit(void);
 203
 204 u64 count_range_bits(struct extent_io_tree *tree,
 205                      u64 *start, u64 search_end,
 206                      u64 max_bytes, unsigned long bits, int contig);
 207
 208 void free_extent_state(struct extent_state *state);
 209 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 210                    int bits, int filled, struct extent_state *cached_state);
 211 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 212                       int bits, gfp_t mask);
 213 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 214                      int bits, int wake, int delete, struct extent_state **cached,
 215                      gfp_t mask);
 216 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 217                     int bits, gfp_t mask);
 218 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 219                    int bits, u64 *failed_start,
 220                    struct extent_state **cached_state, gfp_t mask);
 221 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 222                         struct extent_state **cached_state, gfp_t mask);
 223 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 224                           struct extent_state **cached_state, gfp_t mask);
 225 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 226                    gfp_t mask);
 227 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 228                      gfp_t mask);
 229 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 230                        gfp_t mask);
 231 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 232                        int bits, int clear_bits,
 233                        struct extent_state **cached_state, gfp_t mask);
 234 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 235                         struct extent_state **cached_state, gfp_t mask);
 236 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
 237                       struct extent_state **cached_state, gfp_t mask);
 238 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 239                           u64 *start_ret, u64 *end_ret, int bits,
 240                           struct extent_state **cached_state);
 241 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 242                                                  u64 start, int bits);
 243 int extent_invalidatepage(struct extent_io_tree *tree,
 244                           struct page *page, unsigned long offset);
 245 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 246                           get_extent_t *get_extent,
 247                           struct writeback_control *wbc);
 248 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 249                               u64 start, u64 end, get_extent_t *get_extent,
 250                               int mode);
 251 int extent_writepages(struct extent_io_tree *tree,
 252                       struct address_space *mapping,
 253                       get_extent_t *get_extent,
 254                       struct writeback_control *wbc);
 255 int btree_write_cache_pages(struct address_space *mapping,
 256                             struct writeback_control *wbc);
 257 int extent_readpages(struct extent_io_tree *tree,
 258                      struct address_space *mapping,
 259                      struct list_head *pages, unsigned nr_pages,
 260                      get_extent_t get_extent);
 261 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 262                 __u64 start, __u64 len, get_extent_t *get_extent);
 263 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 264 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 265 void set_page_extent_mapped(struct page *page);
 266
 267 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 268                                           u64 start, unsigned long len);
 269 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 270 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 271 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 272                                          u64 start, unsigned long len);
 273 void free_extent_buffer(struct extent_buffer *eb);
 274 void free_extent_buffer_stale(struct extent_buffer *eb);
 275 #define WAIT_NONE       0
 276 #define WAIT_COMPLETE   1
 277 #define WAIT_PAGE_LOCK  2
 278 int read_extent_buffer_pages(struct extent_io_tree *tree,
 279                              struct extent_buffer *eb, u64 start, int wait,
 280                              get_extent_t *get_extent, int mirror_num);
 281
 282 static inline unsigned long num_extent_pages(u64 start, u64 len)
 283 {
 284         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
 285                 (start >> PAGE_CACHE_SHIFT);
 286 }
 287
 288 static inline struct page *extent_buffer_page(struct extent_buffer *eb,
 289                                               unsigned long i)
 290 {
 291         return eb->pages[i];
 292 }
 293
 294 static inline void extent_buffer_get(struct extent_buffer *eb)
 295 {
 296         atomic_inc(&eb->refs);
 297 }
 298
 299 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 300                           unsigned long start,
 301                           unsigned long len);
 302 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 303                         unsigned long start,
 304                         unsigned long len);
 305 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 306                          unsigned long start, unsigned long len);
 307 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 308                         unsigned long dst_offset, unsigned long src_offset,
 309                         unsigned long len);
 310 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 311                            unsigned long src_offset, unsigned long len);
 312 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 313                            unsigned long src_offset, unsigned long len);
 314 void memset_extent_buffer(struct extent_buffer *eb, char c,
 315                           unsigned long start, unsigned long len);
 316 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 317 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 318 int set_extent_buffer_dirty(struct extent_buffer *eb);
 319 int set_extent_buffer_uptodate(struct extent_buffer *eb);
 320 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 321 int extent_buffer_uptodate(struct extent_buffer *eb);
 322 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 323                       unsigned long min_len, char **map,
 324                       unsigned long *map_start,
 325                       unsigned long *map_len);
 326 int extent_range_uptodate(struct extent_io_tree *tree,
 327                           u64 start, u64 end);
 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,
 331                                 struct extent_io_tree *tree,
 332                                 u64 start, u64 end, struct page *locked_page,
 333                                 unsigned long op);
 334 struct bio *
 335 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 336                 gfp_t gfp_flags);
 337
 338 struct btrfs_fs_info;
 339
 340 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
 341                         u64 length, u64 logical, struct page *page,
 342                         int mirror_num);
 343 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 344 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 345                          int mirror_num);
 346 #endif