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_BOUNDARY (1 << 9)
  15 #define EXTENT_NODATASUM (1 << 10)
  16 #define EXTENT_DO_ACCOUNTING (1 << 11)
  17 #define EXTENT_FIRST_DELALLOC (1 << 12)
  18 #define EXTENT_NEED_WAIT (1 << 13)
  19 #define EXTENT_DAMAGED (1 << 14)
  20 #define EXTENT_NORESERVE (1 << 15)
  21 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  22 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
  23
  24 /*
  25  * flags for bio submission. The high bits indicate the compression
  26  * type for this bio
  27  */
  28 #define EXTENT_BIO_COMPRESSED 1
  29 #define EXTENT_BIO_TREE_LOG 2
  30 #define EXTENT_BIO_PARENT_LOCKED 4
  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_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_READ_ERR 8        /* read IO error */
  42 #define EXTENT_BUFFER_DUMMY 9
  43 #define EXTENT_BUFFER_IN_TREE 10
  44 #define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */
  45
  46 /* these are flags for extent_clear_unlock_delalloc */
  47 #define PAGE_UNLOCK             (1 << 0)
  48 #define PAGE_CLEAR_DIRTY        (1 << 1)
  49 #define PAGE_SET_WRITEBACK      (1 << 2)
  50 #define PAGE_END_WRITEBACK      (1 << 3)
  51 #define PAGE_SET_PRIVATE2       (1 << 4)
  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
  59 struct extent_state;
  60 struct btrfs_root;
  61 struct btrfs_io_bio;
  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)(int rw, struct page *page, unsigned long offset,
  74                               size_t size, struct bio *bio,
  75                               unsigned long bio_flags);
  76         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
  77         int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
  78                                     struct page *page, u64 start, u64 end,
  79                                     int mirror);
  80         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  81                                       struct extent_state *state, int uptodate);
  82         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  83                              unsigned long *bits);
  84         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  85                                unsigned long *bits);
  86         void (*merge_extent_hook)(struct inode *inode,
  87                                   struct extent_state *new,
  88                                   struct extent_state *other);
  89         void (*split_extent_hook)(struct inode *inode,
  90                                   struct extent_state *orig, u64 split);
  91 };
  92
  93 struct extent_io_tree {
  94         struct rb_root state;
  95         struct address_space *mapping;
  96         u64 dirty_bytes;
  97         int track_uptodate;
  98         spinlock_t lock;
  99         struct extent_io_ops *ops;
 100 };
 101
 102 struct extent_state {
 103         u64 start;
 104         u64 end; /* inclusive */
 105         struct rb_node rb_node;
 106
 107         /* ADD NEW ELEMENTS AFTER THIS */
 108         wait_queue_head_t wq;
 109         atomic_t refs;
 110         unsigned long state;
 111
 112         /* for use by the FS */
 113         u64 private;
 114
 115 #ifdef CONFIG_BTRFS_DEBUG
 116         struct list_head leak_list;
 117 #endif
 118 };
 119
 120 #define INLINE_EXTENT_BUFFER_PAGES 16
 121 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
 122 struct extent_buffer {
 123         u64 start;
 124         unsigned long len;
 125         unsigned long bflags;
 126         struct btrfs_fs_info *fs_info;
 127         spinlock_t refs_lock;
 128         atomic_t refs;
 129         atomic_t io_pages;
 130         int read_mirror;
 131         struct rcu_head rcu_head;
 132         pid_t lock_owner;
 133
 134         /* count of read lock holders on the extent buffer */
 135         atomic_t write_locks;
 136         atomic_t read_locks;
 137         atomic_t blocking_writers;
 138         atomic_t blocking_readers;
 139         atomic_t spinning_readers;
 140         atomic_t spinning_writers;
 141         short lock_nested;
 142         /* >= 0 if eb belongs to a log tree, -1 otherwise */
 143         short log_index;
 144
 145         /* protects write locks */
 146         rwlock_t lock;
 147
 148         /* readers use lock_wq while they wait for the write
 149          * lock holders to unlock
 150          */
 151         wait_queue_head_t write_lock_wq;
 152
 153         /* writers use read_lock_wq while they wait for readers
 154          * to unlock
 155          */
 156         wait_queue_head_t read_lock_wq;
 157         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 158 #ifdef CONFIG_BTRFS_DEBUG
 159         struct list_head leak_list;
 160 #endif
 161 };
 162
 163 static inline void extent_set_compress_type(unsigned long *bio_flags,
 164                                             int compress_type)
 165 {
 166         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 167 }
 168
 169 static inline int extent_compress_type(unsigned long bio_flags)
 170 {
 171         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 172 }
 173
 174 struct extent_map_tree;
 175
 176 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 177                                           struct page *page,
 178                                           size_t pg_offset,
 179                                           u64 start, u64 len,
 180                                           int create);
 181
 182 void extent_io_tree_init(struct extent_io_tree *tree,
 183                          struct address_space *mapping);
 184 int try_release_extent_mapping(struct extent_map_tree *map,
 185                                struct extent_io_tree *tree, struct page *page,
 186                                gfp_t mask);
 187 int try_release_extent_buffer(struct page *page);
 188 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 189 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 190                      unsigned long bits, struct extent_state **cached);
 191 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 192 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 193                          struct extent_state **cached, gfp_t mask);
 194 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 195 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 196                           get_extent_t *get_extent, int mirror_num);
 197 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
 198                                  get_extent_t *get_extent, int mirror_num);
 199 int __init extent_io_init(void);
 200 void extent_io_exit(void);
 201
 202 u64 count_range_bits(struct extent_io_tree *tree,
 203                      u64 *start, u64 search_end,
 204                      u64 max_bytes, unsigned long bits, int contig);
 205
 206 void free_extent_state(struct extent_state *state);
 207 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 208                    unsigned long bits, int filled,
 209                    struct extent_state *cached_state);
 210 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 211                       unsigned long bits, gfp_t mask);
 212 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 213                      unsigned long bits, int wake, int delete,
 214                      struct extent_state **cached, gfp_t mask);
 215 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 216                     unsigned long bits, gfp_t mask);
 217 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 218                    unsigned long bits, u64 *failed_start,
 219                    struct extent_state **cached_state, gfp_t mask);
 220 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 221                         struct extent_state **cached_state, gfp_t mask);
 222 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 223                           struct extent_state **cached_state, gfp_t mask);
 224 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 225                    gfp_t mask);
 226 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 227                      gfp_t mask);
 228 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 229                        gfp_t mask);
 230 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 231                        unsigned long bits, unsigned long clear_bits,
 232                        struct extent_state **cached_state, gfp_t mask);
 233 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 234                         struct extent_state **cached_state, gfp_t mask);
 235 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
 236                       struct extent_state **cached_state, gfp_t mask);
 237 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 238                           u64 *start_ret, u64 *end_ret, unsigned long bits,
 239                           struct extent_state **cached_state);
 240 int extent_invalidatepage(struct extent_io_tree *tree,
 241                           struct page *page, unsigned long offset);
 242 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 243                           get_extent_t *get_extent,
 244                           struct writeback_control *wbc);
 245 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 246                               u64 start, u64 end, get_extent_t *get_extent,
 247                               int mode);
 248 int extent_writepages(struct extent_io_tree *tree,
 249                       struct address_space *mapping,
 250                       get_extent_t *get_extent,
 251                       struct writeback_control *wbc);
 252 int btree_write_cache_pages(struct address_space *mapping,
 253                             struct writeback_control *wbc);
 254 int extent_readpages(struct extent_io_tree *tree,
 255                      struct address_space *mapping,
 256                      struct list_head *pages, unsigned nr_pages,
 257                      get_extent_t get_extent);
 258 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 259                 __u64 start, __u64 len, get_extent_t *get_extent);
 260 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 261 void set_page_extent_mapped(struct page *page);
 262
 263 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 264                                           u64 start, unsigned long len);
 265 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 266 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 267 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
 268                                          u64 start);
 269 void free_extent_buffer(struct extent_buffer *eb);
 270 void free_extent_buffer_stale(struct extent_buffer *eb);
 271 #define WAIT_NONE       0
 272 #define WAIT_COMPLETE   1
 273 #define WAIT_PAGE_LOCK  2
 274 int read_extent_buffer_pages(struct extent_io_tree *tree,
 275                              struct extent_buffer *eb, u64 start, int wait,
 276                              get_extent_t *get_extent, int mirror_num);
 277 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 278
 279 static inline unsigned long num_extent_pages(u64 start, u64 len)
 280 {
 281         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
 282                 (start >> PAGE_CACHE_SHIFT);
 283 }
 284
 285 static inline void extent_buffer_get(struct extent_buffer *eb)
 286 {
 287         atomic_inc(&eb->refs);
 288 }
 289
 290 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 291                           unsigned long start,
 292                           unsigned long len);
 293 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 294                         unsigned long start,
 295                         unsigned long len);
 296 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
 297                                unsigned long start,
 298                                unsigned long len);
 299 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 300                          unsigned long start, unsigned long len);
 301 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 302                         unsigned long dst_offset, unsigned long src_offset,
 303                         unsigned long len);
 304 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 305                            unsigned long src_offset, unsigned long len);
 306 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 307                            unsigned long src_offset, unsigned long len);
 308 void memset_extent_buffer(struct extent_buffer *eb, char c,
 309                           unsigned long start, unsigned long len);
 310 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 311 int set_extent_buffer_dirty(struct extent_buffer *eb);
 312 int set_extent_buffer_uptodate(struct extent_buffer *eb);
 313 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 314 int extent_buffer_uptodate(struct extent_buffer *eb);
 315 int extent_buffer_under_io(struct extent_buffer *eb);
 316 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 317                       unsigned long min_len, char **map,
 318                       unsigned long *map_start,
 319                       unsigned long *map_len);
 320 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 321 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
 322 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
 323                                  struct page *locked_page,
 324                                  unsigned long bits_to_clear,
 325                                  unsigned long page_ops);
 326 struct bio *
 327 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 328                 gfp_t gfp_flags);
 329 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
 330 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
 331
 332 struct btrfs_fs_info;
 333
 334 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
 335                       struct page *page, unsigned int pg_offset,
 336                       int mirror_num);
 337 int clean_io_failure(struct inode *inode, u64 start, struct page *page,
 338                      unsigned int pg_offset);
 339 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 340 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 341                          int mirror_num);
 342
 343 /*
 344  * When IO fails, either with EIO or csum verification fails, we
 345  * try other mirrors that might have a good copy of the data.  This
 346  * io_failure_record is used to record state as we go through all the
 347  * mirrors.  If another mirror has good data, the page is set up to date
 348  * and things continue.  If a good mirror can't be found, the original
 349  * bio end_io callback is called to indicate things have failed.
 350  */
 351 struct io_failure_record {
 352         struct page *page;
 353         u64 start;
 354         u64 len;
 355         u64 logical;
 356         unsigned long bio_flags;
 357         int this_mirror;
 358         int failed_mirror;
 359         int in_validation;
 360 };
 361
 362 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
 363 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
 364                                 struct io_failure_record **failrec_ret);
 365 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
 366                            struct io_failure_record *failrec, int fail_mirror);
 367 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
 368                                     struct io_failure_record *failrec,
 369                                     struct page *page, int pg_offset, int icsum,
 370                                     bio_end_io_t *endio_func, void *data);
 371 int free_io_failure(struct inode *inode, struct io_failure_record *rec);
 372 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 373 noinline u64 find_lock_delalloc_range(struct inode *inode,
 374                                       struct extent_io_tree *tree,
 375                                       struct page *locked_page, u64 *start,
 376                                       u64 *end, u64 max_bytes);
 377 #endif
 378 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
 379                                                u64 start, unsigned long len);
 380 #endif