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_NORESERVE (1 << 15)
  23 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  24 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
  25
  26 /*
  27  * flags for bio submission. The high bits indicate the compression
  28  * type for this bio
  29  */
  30 #define EXTENT_BIO_COMPRESSED 1
  31 #define EXTENT_BIO_TREE_LOG 2
  32 #define EXTENT_BIO_PARENT_LOCKED 4
  33 #define EXTENT_BIO_FLAG_SHIFT 16
  34
  35 /* these are bit numbers for test/set bit */
  36 #define EXTENT_BUFFER_UPTODATE 0
  37 #define EXTENT_BUFFER_BLOCKING 1
  38 #define EXTENT_BUFFER_DIRTY 2
  39 #define EXTENT_BUFFER_CORRUPT 3
  40 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
  41 #define EXTENT_BUFFER_TREE_REF 5
  42 #define EXTENT_BUFFER_STALE 6
  43 #define EXTENT_BUFFER_WRITEBACK 7
  44 #define EXTENT_BUFFER_IOERR 8
  45 #define EXTENT_BUFFER_DUMMY 9
  46 #define EXTENT_BUFFER_IN_TREE 10
  47
  48 /* these are flags for extent_clear_unlock_delalloc */
  49 #define PAGE_UNLOCK             (1 << 0)
  50 #define PAGE_CLEAR_DIRTY        (1 << 1)
  51 #define PAGE_SET_WRITEBACK      (1 << 2)
  52 #define PAGE_END_WRITEBACK      (1 << 3)
  53 #define PAGE_SET_PRIVATE2       (1 << 4)
  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 struct btrfs_io_bio;
  65
  66 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  67                                        struct bio *bio, int mirror_num,
  68                                        unsigned long bio_flags, u64 bio_offset);
  69 struct extent_io_ops {
  70         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  71                              u64 start, u64 end, int *page_started,
  72                              unsigned long *nr_written);
  73         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  74         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  75         extent_submit_bio_hook_t *submit_bio_hook;
  76         int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
  77                               size_t size, struct bio *bio,
  78                               unsigned long bio_flags);
  79         int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
  80         int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
  81                                     struct page *page, u64 start, u64 end,
  82                                     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                              unsigned long *bits);
  87         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  88                                unsigned long *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 };
  95
  96 struct extent_io_tree {
  97         struct rb_root state;
  98         struct address_space *mapping;
  99         u64 dirty_bytes;
 100         int track_uptodate;
 101         spinlock_t 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         wait_queue_head_t wq;
 112         atomic_t refs;
 113         unsigned long state;
 114
 115         /* for use by the FS */
 116         u64 private;
 117
 118 #ifdef CONFIG_BTRFS_DEBUG
 119         struct list_head leak_list;
 120 #endif
 121 };
 122
 123 #define INLINE_EXTENT_BUFFER_PAGES 16
 124 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
 125 struct extent_buffer {
 126         u64 start;
 127         unsigned long len;
 128         unsigned long bflags;
 129         struct btrfs_fs_info *fs_info;
 130         spinlock_t refs_lock;
 131         atomic_t refs;
 132         atomic_t io_pages;
 133         int read_mirror;
 134         struct rcu_head rcu_head;
 135         pid_t lock_owner;
 136
 137         /* count of read lock holders on the extent buffer */
 138         atomic_t write_locks;
 139         atomic_t read_locks;
 140         atomic_t blocking_writers;
 141         atomic_t blocking_readers;
 142         atomic_t spinning_readers;
 143         atomic_t spinning_writers;
 144         int lock_nested;
 145
 146         /* protects write locks */
 147         rwlock_t lock;
 148
 149         /* readers use lock_wq while they wait for the write
 150          * lock holders to unlock
 151          */
 152         wait_queue_head_t write_lock_wq;
 153
 154         /* writers use read_lock_wq while they wait for readers
 155          * to unlock
 156          */
 157         wait_queue_head_t read_lock_wq;
 158         struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 159 #ifdef CONFIG_BTRFS_DEBUG
 160         struct list_head leak_list;
 161 #endif
 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);
 189 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 190 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 191                      unsigned long bits, struct extent_state **cached);
 192 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 193 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 194                          struct extent_state **cached, gfp_t mask);
 195 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 196 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 197                           get_extent_t *get_extent, int mirror_num);
 198 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
 199                                  get_extent_t *get_extent, int mirror_num);
 200 int __init extent_io_init(void);
 201 void extent_io_exit(void);
 202
 203 u64 count_range_bits(struct extent_io_tree *tree,
 204                      u64 *start, u64 search_end,
 205                      u64 max_bytes, unsigned long bits, int contig);
 206
 207 void free_extent_state(struct extent_state *state);
 208 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 209                    unsigned long bits, int filled,
 210                    struct extent_state *cached_state);
 211 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 212                       unsigned long bits, gfp_t mask);
 213 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 214                      unsigned long bits, int wake, int delete,
 215                      struct extent_state **cached, gfp_t mask);
 216 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 217                     unsigned long bits, gfp_t mask);
 218 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 219                    unsigned long 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                        unsigned long bits, unsigned long 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, unsigned long bits,
 240                           struct extent_state **cached_state);
 241 int extent_invalidatepage(struct extent_io_tree *tree,
 242                           struct page *page, unsigned long offset);
 243 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 244                           get_extent_t *get_extent,
 245                           struct writeback_control *wbc);
 246 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 247                               u64 start, u64 end, get_extent_t *get_extent,
 248                               int mode);
 249 int extent_writepages(struct extent_io_tree *tree,
 250                       struct address_space *mapping,
 251                       get_extent_t *get_extent,
 252                       struct writeback_control *wbc);
 253 int btree_write_cache_pages(struct address_space *mapping,
 254                             struct writeback_control *wbc);
 255 int extent_readpages(struct extent_io_tree *tree,
 256                      struct address_space *mapping,
 257                      struct list_head *pages, unsigned nr_pages,
 258                      get_extent_t get_extent);
 259 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 260                 __u64 start, __u64 len, get_extent_t *get_extent);
 261 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 262 void set_page_extent_mapped(struct page *page);
 263
 264 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 265                                           u64 start, unsigned long len);
 266 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 267 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 268 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
 269                                          u64 start);
 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 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 279
 280 static inline unsigned long num_extent_pages(u64 start, u64 len)
 281 {
 282         return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
 283                 (start >> PAGE_CACHE_SHIFT);
 284 }
 285
 286 static inline struct page *extent_buffer_page(struct extent_buffer *eb,
 287                                               unsigned long i)
 288 {
 289         return eb->pages[i];
 290 }
 291
 292 static inline void extent_buffer_get(struct extent_buffer *eb)
 293 {
 294         atomic_inc(&eb->refs);
 295 }
 296
 297 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 298                           unsigned long start,
 299                           unsigned long len);
 300 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 301                         unsigned long start,
 302                         unsigned long len);
 303 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
 304                                unsigned long start,
 305                                unsigned long len);
 306 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 307                          unsigned long start, unsigned long len);
 308 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 309                         unsigned long dst_offset, unsigned long src_offset,
 310                         unsigned long len);
 311 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 312                            unsigned long src_offset, unsigned long len);
 313 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 314                            unsigned long src_offset, unsigned long len);
 315 void memset_extent_buffer(struct extent_buffer *eb, char c,
 316                           unsigned long start, unsigned long len);
 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 extent_buffer_under_io(struct extent_buffer *eb);
 323 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 324                       unsigned long min_len, char **map,
 325                       unsigned long *map_start,
 326                       unsigned long *map_len);
 327 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 328 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
 329 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
 330                                  struct page *locked_page,
 331                                  unsigned long bits_to_clear,
 332                                  unsigned long page_ops);
 333 struct bio *
 334 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 335                 gfp_t gfp_flags);
 336 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
 337 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
 338
 339 struct btrfs_fs_info;
 340
 341 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
 342                       struct page *page, unsigned int pg_offset,
 343                       int mirror_num);
 344 int clean_io_failure(struct inode *inode, u64 start, struct page *page,
 345                      unsigned int pg_offset);
 346 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 347 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 348                          int mirror_num);
 349
 350 /*
 351  * When IO fails, either with EIO or csum verification fails, we
 352  * try other mirrors that might have a good copy of the data.  This
 353  * io_failure_record is used to record state as we go through all the
 354  * mirrors.  If another mirror has good data, the page is set up to date
 355  * and things continue.  If a good mirror can't be found, the original
 356  * bio end_io callback is called to indicate things have failed.
 357  */
 358 struct io_failure_record {
 359         struct page *page;
 360         u64 start;
 361         u64 len;
 362         u64 logical;
 363         unsigned long bio_flags;
 364         int this_mirror;
 365         int failed_mirror;
 366         int in_validation;
 367 };
 368
 369 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
 370                                 struct io_failure_record **failrec_ret);
 371 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
 372                            struct io_failure_record *failrec, int fail_mirror);
 373 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
 374                                     struct io_failure_record *failrec,
 375                                     struct page *page, int pg_offset, int icsum,
 376                                     bio_end_io_t *endio_func, void *data);
 377 int free_io_failure(struct inode *inode, struct io_failure_record *rec);
 378 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 379 noinline u64 find_lock_delalloc_range(struct inode *inode,
 380                                       struct extent_io_tree *tree,
 381                                       struct page *locked_page, u64 *start,
 382                                       u64 *end, u64 max_bytes);
 383 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
 384                                                u64 start, unsigned long len);
 385 #endif
 386 #endif