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 (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  80                                         u64 start, u64 end,
  81                                        struct extent_state *state);
  82         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  83                                     struct extent_state *state, int mirror);
  84         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  85                                       struct extent_state *state, int uptodate);
  86         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  87                              int *bits);
  88         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  89                                int *bits);
  90         void (*merge_extent_hook)(struct inode *inode,
  91                                   struct extent_state *new,
  92                                   struct extent_state *other);
  93         void (*split_extent_hook)(struct inode *inode,
  94                                   struct extent_state *orig, u64 split);
  95         int (*write_cache_pages_lock_hook)(struct page *page, void *data,
  96                                            void (*flush_fn)(void *));
  97 };
  98
  99 struct extent_io_tree {
 100         struct rb_root state;
 101         struct radix_tree_root buffer;
 102         struct address_space *mapping;
 103         u64 dirty_bytes;
 104         int track_uptodate;
 105         spinlock_t lock;
 106         spinlock_t buffer_lock;
 107         struct extent_io_ops *ops;
 108 };
 109
 110 struct extent_state {
 111         u64 start;
 112         u64 end; /* inclusive */
 113         struct rb_node rb_node;
 114
 115         /* ADD NEW ELEMENTS AFTER THIS */
 116         struct extent_io_tree *tree;
 117         wait_queue_head_t wq;
 118         atomic_t refs;
 119         unsigned long state;
 120
 121         /* for use by the FS */
 122         u64 private;
 123
 124         struct list_head leak_list;
 125 };
 126
 127 #define INLINE_EXTENT_BUFFER_PAGES 16
 128 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
 129 struct extent_buffer {
 130         u64 start;
 131         unsigned long len;
 132         unsigned long map_start;
 133         unsigned long map_len;
 134         unsigned long bflags;
 135         struct extent_io_tree *tree;
 136         spinlock_t refs_lock;
 137         atomic_t refs;
 138         atomic_t io_pages;
 139         int read_mirror;
 140         struct list_head leak_list;
 141         struct rcu_head rcu_head;
 142         pid_t lock_owner;
 143
 144         /* count of read lock holders on the extent buffer */
 145         atomic_t write_locks;
 146         atomic_t read_locks;
 147         atomic_t blocking_writers;
 148         atomic_t blocking_readers;
 149         atomic_t spinning_readers;
 150         atomic_t spinning_writers;
 151         int lock_nested;
 152
 153         /* protects write locks */
 154         rwlock_t lock;
 155
 156         /* readers use lock_wq while they wait for the write
 157          * lock holders to unlock
 158          */
 159         wait_queue_head_t write_lock_wq;
 160
 161         /* writers use read_lock_wq while they wait for readers
 162          * to unlock
 163          */
 164         wait_queue_head_t read_lock_wq;
 165         wait_queue_head_t lock_wq;
 166         struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
 167         struct page **pages;
 168 };
 169
 170 static inline void extent_set_compress_type(unsigned long *bio_flags,
 171                                             int compress_type)
 172 {
 173         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 174 }
 175
 176 static inline int extent_compress_type(unsigned long bio_flags)
 177 {
 178         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 179 }
 180
 181 struct extent_map_tree;
 182
 183 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 184                                           struct page *page,
 185                                           size_t pg_offset,
 186                                           u64 start, u64 len,
 187                                           int create);
 188
 189 void extent_io_tree_init(struct extent_io_tree *tree,
 190                          struct address_space *mapping);
 191 int try_release_extent_mapping(struct extent_map_tree *map,
 192                                struct extent_io_tree *tree, struct page *page,
 193                                gfp_t mask);
 194 int try_release_extent_buffer(struct page *page, gfp_t mask);
 195 int try_release_extent_state(struct extent_map_tree *map,
 196                              struct extent_io_tree *tree, struct page *page,
 197                              gfp_t mask);
 198 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 199 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 200                      int bits, struct extent_state **cached);
 201 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 202 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 203                          struct extent_state **cached, gfp_t mask);
 204 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 205 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 206                           get_extent_t *get_extent, int mirror_num);
 207 int __init extent_io_init(void);
 208 void extent_io_exit(void);
 209
 210 u64 count_range_bits(struct extent_io_tree *tree,
 211                      u64 *start, u64 search_end,
 212                      u64 max_bytes, unsigned long bits, int contig);
 213
 214 void free_extent_state(struct extent_state *state);
 215 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 216                    int bits, int filled, struct extent_state *cached_state);
 217 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 218                       int bits, gfp_t mask);
 219 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 220                      int bits, int wake, int delete, struct extent_state **cached,
 221                      gfp_t mask);
 222 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 223                     int bits, gfp_t mask);
 224 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 225                    int bits, u64 *failed_start,
 226                    struct extent_state **cached_state, gfp_t mask);
 227 int set_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, gfp_t mask);
 237 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 238                         struct extent_state **cached_state, gfp_t mask);
 239 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 240                           u64 *start_ret, u64 *end_ret, int bits);
 241 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 242                                                  u64 start, int bits);
 243 int extent_invalidatepage(struct extent_io_tree *tree,
 244                           struct page *page, unsigned long offset);
 245 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 246                           get_extent_t *get_extent,
 247                           struct writeback_control *wbc);
 248 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 249                               u64 start, u64 end, get_extent_t *get_extent,
 250                               int mode);
 251 int extent_writepages(struct extent_io_tree *tree,
 252                       struct address_space *mapping,
 253                       get_extent_t *get_extent,
 254                       struct writeback_control *wbc);
 255 int btree_write_cache_pages(struct address_space *mapping,
 256                             struct writeback_control *wbc);
 257 int extent_readpages(struct extent_io_tree *tree,
 258                      struct address_space *mapping,
 259                      struct list_head *pages, unsigned nr_pages,
 260                      get_extent_t get_extent);
 261 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 262                 __u64 start, __u64 len, get_extent_t *get_extent);
 263 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 264 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 265 void set_page_extent_mapped(struct page *page);
 266
 267 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 268                                           u64 start, unsigned long len);
 269 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 270 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 271 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 272                                          u64 start, unsigned long len);
 273 void free_extent_buffer(struct extent_buffer *eb);
 274 void free_extent_buffer_stale(struct extent_buffer *eb);
 275 #define WAIT_NONE       0
 276 #define WAIT_COMPLETE   1
 277 #define WAIT_PAGE_LOCK  2
 278 int read_extent_buffer_pages(struct extent_io_tree *tree,
 279                              struct extent_buffer *eb, u64 start, int wait,
 280                              get_extent_t *get_extent, int mirror_num);
 281 unsigned long num_extent_pages(u64 start, u64 len);
 282 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
 283
 284 static inline void extent_buffer_get(struct extent_buffer *eb)
 285 {
 286         atomic_inc(&eb->refs);
 287 }
 288
 289 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 290                           unsigned long start,
 291                           unsigned long len);
 292 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 293                         unsigned long start,
 294                         unsigned long len);
 295 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 296                          unsigned long start, unsigned long len);
 297 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 298                         unsigned long dst_offset, unsigned long src_offset,
 299                         unsigned long len);
 300 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 301                            unsigned long src_offset, unsigned long len);
 302 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 303                            unsigned long src_offset, unsigned long len);
 304 void memset_extent_buffer(struct extent_buffer *eb, char c,
 305                           unsigned long start, unsigned long len);
 306 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 307 void clear_extent_buffer_dirty(struct extent_buffer *eb);
 308 int set_extent_buffer_dirty(struct extent_buffer *eb);
 309 int set_extent_buffer_uptodate(struct extent_buffer *eb);
 310 int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 311 int extent_buffer_uptodate(struct extent_buffer *eb);
 312 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 313                       unsigned long min_len, char **map,
 314                       unsigned long *map_start,
 315                       unsigned long *map_len);
 316 int extent_range_uptodate(struct extent_io_tree *tree,
 317                           u64 start, u64 end);
 318 int extent_clear_unlock_delalloc(struct inode *inode,
 319                                 struct extent_io_tree *tree,
 320                                 u64 start, u64 end, struct page *locked_page,
 321                                 unsigned long op);
 322 struct bio *
 323 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 324                 gfp_t gfp_flags);
 325
 326 struct btrfs_mapping_tree;
 327
 328 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
 329                         u64 length, u64 logical, struct page *page,
 330                         int mirror_num);
 331 int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 332 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 333                          int mirror_num);
 334 #endif