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)(struct page *page, unsigned long offset,
  76                               size_t size, struct bio *bio,
  77                               unsigned long bio_flags);
  78         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  79         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
  80         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  81                                     struct extent_state *state, 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                              int *bits);
  86         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  87                                int *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         int (*write_cache_pages_lock_hook)(struct page *page, void *data,
  94                                            void (*flush_fn)(void *));
  95 };
  96
  97 struct extent_io_tree {
  98         struct rb_root state;
  99         struct radix_tree_root buffer;
 100         struct address_space *mapping;
 101         u64 dirty_bytes;
 102         int track_uptodate;
 103         spinlock_t lock;
 104         spinlock_t buffer_lock;
 105         struct extent_io_ops *ops;
 106 };
 107
 108 struct extent_state {
 109         u64 start;
 110         u64 end; /* inclusive */
 111         struct rb_node rb_node;
 112
 113         /* ADD NEW ELEMENTS AFTER THIS */
 114         struct extent_io_tree *tree;
 115         wait_queue_head_t wq;
 116         atomic_t refs;
 117         unsigned long state;
 118
 119         /* for use by the FS */
 120         u64 private;
 121
 122         struct list_head leak_list;
 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 list_head leak_list;
 139         struct rcu_head rcu_head;
 140         pid_t lock_owner;
 141
 142         /* count of read lock holders on the extent buffer */
 143         atomic_t write_locks;
 144         atomic_t read_locks;
 145         atomic_t blocking_writers;
 146         atomic_t blocking_readers;
 147         atomic_t spinning_readers;
 148         atomic_t spinning_writers;
 149         int lock_nested;
 150
 151         /* protects write locks */
 152         rwlock_t lock;
 153
 154         /* readers use lock_wq while they wait for the write
 155          * lock holders to unlock
 156          */
 157         wait_queue_head_t write_lock_wq;
 158
 159         /* writers use read_lock_wq while they wait for readers
 160          * to unlock
 161          */
 162         wait_queue_head_t read_lock_wq;
 163         wait_queue_head_t lock_wq;
 164         struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
 165         struct page **pages;
 166 };
 167
 168 static inline void extent_set_compress_type(unsigned long *bio_flags,
 169                                             int compress_type)
 170 {
 171         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 172 }
 173
 174 static inline int extent_compress_type(unsigned long bio_flags)
 175 {
 176         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 177 }
 178
 179 struct extent_map_tree;
 180
 181 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 182                                           struct page *page,
 183                                           size_t pg_offset,
 184                                           u64 start, u64 len,
 185                                           int create);
 186
 187 void extent_io_tree_init(struct extent_io_tree *tree,
 188                          struct address_space *mapping);
 189 int try_release_extent_mapping(struct extent_map_tree *map,
 190                                struct extent_io_tree *tree, struct page *page,
 191                                gfp_t mask);
 192 int try_release_extent_buffer(struct page *page, gfp_t mask);
 193 int try_release_extent_state(struct extent_map_tree *map,
 194                              struct extent_io_tree *tree, struct page *page,
 195                              gfp_t mask);
 196 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 197 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 198                      int bits, struct extent_state **cached);
 199 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 200 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 201                          struct extent_state **cached, gfp_t mask);
 202 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 203 int extent_read_full_page(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                    int bits, int filled, struct extent_state *cached_state);
 215 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 216                       int bits, gfp_t mask);
 217 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 218                      int bits, int wake, int delete, struct extent_state **cached,
 219                      gfp_t mask);
 220 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 221                     int bits, gfp_t mask);
 222 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 223                    int bits, u64 *failed_start,
 224                    struct extent_state **cached_state, gfp_t mask);
 225 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 226                         struct extent_state **cached_state, gfp_t mask);
 227 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 228                           struct extent_state **cached_state, gfp_t mask);
 229 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 230                    gfp_t mask);
 231 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 232                      gfp_t mask);
 233 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 234                        gfp_t mask);
 235 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 236                        int bits, int clear_bits,
 237                        struct extent_state **cached_state, gfp_t mask);
 238 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 239                         struct extent_state **cached_state, gfp_t mask);
 240 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
 241                       struct extent_state **cached_state, gfp_t mask);
 242 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 243                           u64 *start_ret, u64 *end_ret, int bits,
 244                           struct extent_state **cached_state);
 245 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 246                                                  u64 start, int bits);
 247 int extent_invalidatepage(struct extent_io_tree *tree,
 248                           struct page *page, unsigned long offset);
 249 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 250                           get_extent_t *get_extent,
 251                           struct writeback_control *wbc);
 252 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 253                               u64 start, u64 end, get_extent_t *get_extent,
 254                               int mode);
 255 int extent_writepages(struct extent_io_tree *tree,
 256                       struct address_space *mapping,
 257                       get_extent_t *get_extent,
 258                       struct writeback_control *wbc);
 259 int btree_write_cache_pages(struct address_space *mapping,
 260                             struct writeback_control *wbc);
 261 int extent_readpages(struct extent_io_tree *tree,
 262                      struct address_space *mapping,
 263                      struct list_head *pages, unsigned nr_pages,
 264                      get_extent_t get_extent);
 265 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 266                 __u64 start, __u64 len, get_extent_t *get_extent);
 267 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 268 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 269 void set_page_extent_mapped(struct page *page);
 270
 271 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 272                                           u64 start, unsigned long len);
 273 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 274 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 275 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 276                                          u64 start, unsigned long len);
 277 void free_extent_buffer(struct extent_buffer *eb);
 278 void free_extent_buffer_stale(struct extent_buffer *eb);
 279 #define WAIT_NONE       0
 280 #define WAIT_COMPLETE   1
 281 #define WAIT_PAGE_LOCK  2
 282 int read_extent_buffer_pages(struct extent_io_tree *tree,
 283                              struct extent_buffer *eb, u64 start, int wait,
 284                              get_extent_t *get_extent, int mirror_num);
 285
 286 static inline unsigned long num_extent_pages(u64 start, u64 len)
 287 {
 288         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
 289                 (start >> PAGE_CACHE_SHIFT);
 290 }
 291
 292 static inline struct page *extent_buffer_page(struct extent_buffer *eb,
 293                                               unsigned long i)
 294 {
 295         return eb->pages[i];
 296 }
 297
 298 static inline void extent_buffer_get(struct extent_buffer *eb)
 299 {
 300         atomic_inc(&eb->refs);
 301 }
 302
 303 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 304                           unsigned long start,
 305                           unsigned long len);
 306 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 307                         unsigned long start,
 308                         unsigned long len);
 309 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 310                          unsigned long start, unsigned long len);
 311 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 312                         unsigned long dst_offset, unsigned long src_offset,
 313                         unsigned long len);
 314 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 315                            unsigned long src_offset, unsigned long len);
 316 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 317                            unsigned long src_offset, unsigned long len);
 318 void memset_extent_buffer(struct extent_buffer *eb, char c,
 319                           unsigned long start, unsigned long len);
 320 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 321 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 322 int set_extent_buffer_dirty(struct extent_buffer *eb);
 323 int set_extent_buffer_uptodate(struct extent_buffer *eb);
 324 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 325 int extent_buffer_uptodate(struct extent_buffer *eb);
 326 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 327                       unsigned long min_len, char **map,
 328                       unsigned long *map_start,
 329                       unsigned long *map_len);
 330 int extent_range_uptodate(struct extent_io_tree *tree,
 331                           u64 start, u64 end);
 332 int extent_clear_unlock_delalloc(struct inode *inode,
 333                                 struct extent_io_tree *tree,
 334                                 u64 start, u64 end, struct page *locked_page,
 335                                 unsigned long op);
 336 struct bio *
 337 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 338                 gfp_t gfp_flags);
 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