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
  43 /* these are flags for extent_clear_unlock_delalloc */
  44 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  45 #define EXTENT_CLEAR_UNLOCK      0x2
  46 #define EXTENT_CLEAR_DELALLOC    0x4
  47 #define EXTENT_CLEAR_DIRTY       0x8
  48 #define EXTENT_SET_WRITEBACK     0x10
  49 #define EXTENT_END_WRITEBACK     0x20
  50 #define EXTENT_SET_PRIVATE2      0x40
  51 #define EXTENT_CLEAR_ACCOUNTING  0x80
  52
  53 /*
  54  * page->private values.  Every page that is controlled by the extent
  55  * map has page->private set to one.
  56  */
  57 #define EXTENT_PAGE_PRIVATE 1
  58 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  59
  60 struct extent_state;
  61 struct btrfs_root;
  62
  63 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  64                                        struct bio *bio, int mirror_num,
  65                                        unsigned long bio_flags, u64 bio_offset);
  66 struct extent_io_ops {
  67         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  68                              u64 start, u64 end, int *page_started,
  69                              unsigned long *nr_written);
  70         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  71         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  72         extent_submit_bio_hook_t *submit_bio_hook;
  73         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  74                               size_t size, struct bio *bio,
  75                               unsigned long bio_flags);
  76         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  77         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
  78         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  79                                         u64 start, u64 end,
  80                                        struct extent_state *state);
  81         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  82                                     struct extent_state *state, int mirror);
  83         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  84                                       struct extent_state *state, int uptodate);
  85         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  86                              int *bits);
  87         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  88                                int *bits);
  89         void (*merge_extent_hook)(struct inode *inode,
  90                                   struct extent_state *new,
  91                                   struct extent_state *other);
  92         void (*split_extent_hook)(struct inode *inode,
  93                                   struct extent_state *orig, u64 split);
  94         int (*write_cache_pages_lock_hook)(struct page *page, void *data,
  95                                            void (*flush_fn)(void *));
  96 };
  97
  98 struct extent_io_tree {
  99         struct rb_root state;
 100         struct radix_tree_root buffer;
 101         struct address_space *mapping;
 102         u64 dirty_bytes;
 103         int track_uptodate;
 104         spinlock_t lock;
 105         spinlock_t buffer_lock;
 106         struct extent_io_ops *ops;
 107 };
 108
 109 struct extent_state {
 110         u64 start;
 111         u64 end; /* inclusive */
 112         struct rb_node rb_node;
 113
 114         /* ADD NEW ELEMENTS AFTER THIS */
 115         struct extent_io_tree *tree;
 116         wait_queue_head_t wq;
 117         atomic_t refs;
 118         unsigned long state;
 119
 120         /* for use by the FS */
 121         u64 private;
 122
 123         struct list_head leak_list;
 124 };
 125
 126 #define INLINE_EXTENT_BUFFER_PAGES 16
 127 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
 128 struct extent_buffer {
 129         u64 start;
 130         unsigned long len;
 131         unsigned long map_start;
 132         unsigned long map_len;
 133         unsigned long bflags;
 134         struct extent_io_tree *tree;
 135         spinlock_t refs_lock;
 136         atomic_t refs;
 137         atomic_t io_pages;
 138         int read_mirror;
 139         struct list_head leak_list;
 140         struct rcu_head rcu_head;
 141         pid_t lock_owner;
 142
 143         /* count of read lock holders on the extent buffer */
 144         atomic_t write_locks;
 145         atomic_t read_locks;
 146         atomic_t blocking_writers;
 147         atomic_t blocking_readers;
 148         atomic_t spinning_readers;
 149         atomic_t spinning_writers;
 150         int lock_nested;
 151
 152         /* protects write locks */
 153         rwlock_t lock;
 154
 155         /* readers use lock_wq while they wait for the write
 156          * lock holders to unlock
 157          */
 158         wait_queue_head_t write_lock_wq;
 159
 160         /* writers use read_lock_wq while they wait for readers
 161          * to unlock
 162          */
 163         wait_queue_head_t read_lock_wq;
 164         wait_queue_head_t lock_wq;
 165         struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
 166         struct page **pages;
 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, gfp_t mask);
 194 int try_release_extent_state(struct extent_map_tree *map,
 195                              struct extent_io_tree *tree, struct page *page,
 196                              gfp_t mask);
 197 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 198 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 199                      int bits, struct extent_state **cached);
 200 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 201 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 202                          struct extent_state **cached, gfp_t mask);
 203 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 204 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 205                           get_extent_t *get_extent, int mirror_num);
 206 int __init extent_io_init(void);
 207 void extent_io_exit(void);
 208
 209 u64 count_range_bits(struct extent_io_tree *tree,
 210                      u64 *start, u64 search_end,
 211                      u64 max_bytes, unsigned long bits, int contig);
 212
 213 void free_extent_state(struct extent_state *state);
 214 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 215                    int bits, int filled, struct extent_state *cached_state);
 216 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 217                       int bits, gfp_t mask);
 218 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 219                      int bits, int wake, int delete, struct extent_state **cached,
 220                      gfp_t mask);
 221 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 222                     int bits, gfp_t mask);
 223 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 224                    int 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 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 *find_extent_buffer(struct extent_io_tree *tree,
 269                                          u64 start, unsigned long len);
 270 void free_extent_buffer(struct extent_buffer *eb);
 271 void free_extent_buffer_stale(struct extent_buffer *eb);
 272 #define WAIT_NONE       0
 273 #define WAIT_COMPLETE   1
 274 #define WAIT_PAGE_LOCK  2
 275 int read_extent_buffer_pages(struct extent_io_tree *tree,
 276                              struct extent_buffer *eb, u64 start, int wait,
 277                              get_extent_t *get_extent, int mirror_num);
 278 unsigned long num_extent_pages(u64 start, u64 len);
 279 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
 280
 281 static inline void extent_buffer_get(struct extent_buffer *eb)
 282 {
 283         atomic_inc(&eb->refs);
 284 }
 285
 286 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 287                           unsigned long start,
 288                           unsigned long len);
 289 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 290                         unsigned long start,
 291                         unsigned long len);
 292 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 293                          unsigned long start, unsigned long len);
 294 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 295                         unsigned long dst_offset, unsigned long src_offset,
 296                         unsigned long len);
 297 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 298                            unsigned long src_offset, unsigned long len);
 299 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 300                            unsigned long src_offset, unsigned long len);
 301 void memset_extent_buffer(struct extent_buffer *eb, char c,
 302                           unsigned long start, unsigned long len);
 303 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 304 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 305 int set_extent_buffer_dirty(struct extent_buffer *eb);
 306 int set_extent_buffer_uptodate(struct extent_buffer *eb);
 307 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 308 int extent_buffer_uptodate(struct extent_buffer *eb);
 309 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 310                       unsigned long min_len, char **map,
 311                       unsigned long *map_start,
 312                       unsigned long *map_len);
 313 int extent_range_uptodate(struct extent_io_tree *tree,
 314                           u64 start, u64 end);
 315 int extent_clear_unlock_delalloc(struct inode *inode,
 316                                 struct extent_io_tree *tree,
 317                                 u64 start, u64 end, struct page *locked_page,
 318                                 unsigned long op);
 319 struct bio *
 320 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 321                 gfp_t gfp_flags);
 322
 323 struct btrfs_mapping_tree;
 324
 325 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
 326                         u64 length, u64 logical, struct page *page,
 327                         int mirror_num);
 328 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 329 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 330                          int mirror_num);
 331 #endif