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_FLAG_SHIFT 16
  31
  32 /* these are bit numbers for test/set bit */
  33 #define EXTENT_BUFFER_UPTODATE 0
  34 #define EXTENT_BUFFER_BLOCKING 1
  35 #define EXTENT_BUFFER_DIRTY 2
  36 #define EXTENT_BUFFER_CORRUPT 3
  37 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
  38 #define EXTENT_BUFFER_TREE_REF 5
  39 #define EXTENT_BUFFER_STALE 6
  40 #define EXTENT_BUFFER_WRITEBACK 7
  41 #define EXTENT_BUFFER_IOERR 8
  42 #define EXTENT_BUFFER_DUMMY 9
  43
  44 /* these are flags for extent_clear_unlock_delalloc */
  45 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  46 #define EXTENT_CLEAR_UNLOCK      0x2
  47 #define EXTENT_CLEAR_DELALLOC    0x4
  48 #define EXTENT_CLEAR_DIRTY       0x8
  49 #define EXTENT_SET_WRITEBACK     0x10
  50 #define EXTENT_END_WRITEBACK     0x20
  51 #define EXTENT_SET_PRIVATE2      0x40
  52 #define EXTENT_CLEAR_ACCOUNTING  0x80
  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
  64 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  65                                        struct bio *bio, int mirror_num,
  66                                        unsigned long bio_flags, u64 bio_offset);
  67 struct extent_io_ops {
  68         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  69                              u64 start, u64 end, int *page_started,
  70                              unsigned long *nr_written);
  71         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  72         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  73         extent_submit_bio_hook_t *submit_bio_hook;
  74         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  75                               size_t size, struct bio *bio,
  76                               unsigned long bio_flags);
  77         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  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         int (*write_cache_pages_lock_hook)(struct page *page, void *data,
  93                                            void (*flush_fn)(void *));
  94 };
  95
  96 struct extent_io_tree {
  97         struct rb_root state;
  98         struct radix_tree_root buffer;
  99         struct address_space *mapping;
 100         u64 dirty_bytes;
 101         int track_uptodate;
 102         spinlock_t lock;
 103         spinlock_t buffer_lock;
 104         struct extent_io_ops *ops;
 105 };
 106
 107 struct extent_state {
 108         u64 start;
 109         u64 end; /* inclusive */
 110         struct rb_node rb_node;
 111
 112         /* ADD NEW ELEMENTS AFTER THIS */
 113         struct extent_io_tree *tree;
 114         wait_queue_head_t wq;
 115         atomic_t refs;
 116         unsigned long state;
 117
 118         /* for use by the FS */
 119         u64 private;
 120
 121         struct list_head leak_list;
 122 };
 123
 124 #define INLINE_EXTENT_BUFFER_PAGES 16
 125 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
 126 struct extent_buffer {
 127         u64 start;
 128         unsigned long len;
 129         unsigned long map_start;
 130         unsigned long map_len;
 131         unsigned long bflags;
 132         struct extent_io_tree *tree;
 133         spinlock_t refs_lock;
 134         atomic_t refs;
 135         atomic_t io_pages;
 136         int read_mirror;
 137         struct list_head leak_list;
 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 *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
 164         struct page **pages;
 165 };
 166
 167 static inline void extent_set_compress_type(unsigned long *bio_flags,
 168                                             int compress_type)
 169 {
 170         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 171 }
 172
 173 static inline int extent_compress_type(unsigned long bio_flags)
 174 {
 175         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 176 }
 177
 178 struct extent_map_tree;
 179
 180 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 181                                           struct page *page,
 182                                           size_t pg_offset,
 183                                           u64 start, u64 len,
 184                                           int create);
 185
 186 void extent_io_tree_init(struct extent_io_tree *tree,
 187                          struct address_space *mapping);
 188 int try_release_extent_mapping(struct extent_map_tree *map,
 189                                struct extent_io_tree *tree, struct page *page,
 190                                gfp_t mask);
 191 int try_release_extent_buffer(struct page *page, gfp_t mask);
 192 int try_release_extent_state(struct extent_map_tree *map,
 193                              struct extent_io_tree *tree, struct page *page,
 194                              gfp_t mask);
 195 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 196 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 197                      int bits, struct extent_state **cached);
 198 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 199 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 200                          struct extent_state **cached, gfp_t mask);
 201 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 202 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 203                           get_extent_t *get_extent, int mirror_num);
 204 int __init extent_io_init(void);
 205 void extent_io_exit(void);
 206
 207 u64 count_range_bits(struct extent_io_tree *tree,
 208                      u64 *start, u64 search_end,
 209                      u64 max_bytes, unsigned long bits, int contig);
 210
 211 void free_extent_state(struct extent_state *state);
 212 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 213                    int bits, int filled, struct extent_state *cached_state);
 214 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 215                       int bits, gfp_t mask);
 216 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 217                      int bits, int wake, int delete, struct extent_state **cached,
 218                      gfp_t mask);
 219 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 220                     int bits, gfp_t mask);
 221 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 222                    int bits, u64 *failed_start,
 223                    struct extent_state **cached_state, gfp_t mask);
 224 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 225                         struct extent_state **cached_state, gfp_t mask);
 226 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 227                           struct extent_state **cached_state, gfp_t mask);
 228 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 229                    gfp_t mask);
 230 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 231                      gfp_t mask);
 232 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 233                        gfp_t mask);
 234 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 235                        int bits, int clear_bits, gfp_t mask);
 236 int set_extent_delalloc(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 *find_first_extent_bit_state(struct extent_io_tree *tree,
 241                                                  u64 start, int bits);
 242 int extent_invalidatepage(struct extent_io_tree *tree,
 243                           struct page *page, unsigned long offset);
 244 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 245                           get_extent_t *get_extent,
 246                           struct writeback_control *wbc);
 247 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 248                               u64 start, u64 end, get_extent_t *get_extent,
 249                               int mode);
 250 int extent_writepages(struct extent_io_tree *tree,
 251                       struct address_space *mapping,
 252                       get_extent_t *get_extent,
 253                       struct writeback_control *wbc);
 254 int btree_write_cache_pages(struct address_space *mapping,
 255                             struct writeback_control *wbc);
 256 int extent_readpages(struct extent_io_tree *tree,
 257                      struct address_space *mapping,
 258                      struct list_head *pages, unsigned nr_pages,
 259                      get_extent_t get_extent);
 260 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 261                 __u64 start, __u64 len, get_extent_t *get_extent);
 262 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 263 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 264 void set_page_extent_mapped(struct page *page);
 265
 266 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 267                                           u64 start, unsigned long len);
 268 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 269 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 270 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 271                                          u64 start, unsigned long len);
 272 void free_extent_buffer(struct extent_buffer *eb);
 273 void free_extent_buffer_stale(struct extent_buffer *eb);
 274 #define WAIT_NONE       0
 275 #define WAIT_COMPLETE   1
 276 #define WAIT_PAGE_LOCK  2
 277 int read_extent_buffer_pages(struct extent_io_tree *tree,
 278                              struct extent_buffer *eb, u64 start, int wait,
 279                              get_extent_t *get_extent, int mirror_num);
 280 unsigned long num_extent_pages(u64 start, u64 len);
 281 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
 282
 283 static inline void extent_buffer_get(struct extent_buffer *eb)
 284 {
 285         atomic_inc(&eb->refs);
 286 }
 287
 288 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 289                           unsigned long start,
 290                           unsigned long len);
 291 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 292                         unsigned long start,
 293                         unsigned long len);
 294 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 295                          unsigned long start, unsigned long len);
 296 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 297                         unsigned long dst_offset, unsigned long src_offset,
 298                         unsigned long len);
 299 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 300                            unsigned long src_offset, unsigned long len);
 301 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 302                            unsigned long src_offset, unsigned long len);
 303 void memset_extent_buffer(struct extent_buffer *eb, char c,
 304                           unsigned long start, unsigned long len);
 305 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 306 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 307 int set_extent_buffer_dirty(struct extent_buffer *eb);
 308 int set_extent_buffer_uptodate(struct extent_buffer *eb);
 309 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 310 int extent_buffer_uptodate(struct extent_buffer *eb);
 311 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 312                       unsigned long min_len, char **map,
 313                       unsigned long *map_start,
 314                       unsigned long *map_len);
 315 int extent_range_uptodate(struct extent_io_tree *tree,
 316                           u64 start, u64 end);
 317 int extent_clear_unlock_delalloc(struct inode *inode,
 318                                 struct extent_io_tree *tree,
 319                                 u64 start, u64 end, struct page *locked_page,
 320                                 unsigned long op);
 321 struct bio *
 322 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 323                 gfp_t gfp_flags);
 324
 325 struct btrfs_mapping_tree;
 326
 327 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
 328                         u64 length, u64 logical, struct page *page,
 329                         int mirror_num);
 330 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 331 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 332                          int mirror_num);
 333 #endif