linux/fs/btrfs/extent_io.h
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   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
  62struct extent_state;
  63struct btrfs_root;
  64
  65typedef 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);
  68struct 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
  97struct 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
 108struct 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)
 127struct 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
 168static 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
 174static inline int extent_compress_type(unsigned long bio_flags)
 175{
 176        return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 177}
 178
 179struct extent_map_tree;
 180
 181typedef 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
 187void extent_io_tree_init(struct extent_io_tree *tree,
 188                         struct address_space *mapping);
 189int try_release_extent_mapping(struct extent_map_tree *map,
 190                               struct extent_io_tree *tree, struct page *page,
 191                               gfp_t mask);
 192int try_release_extent_buffer(struct page *page, gfp_t mask);
 193int try_release_extent_state(struct extent_map_tree *map,
 194                             struct extent_io_tree *tree, struct page *page,
 195                             gfp_t mask);
 196int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 197int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 198                     int bits, struct extent_state **cached);
 199int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 200int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 201                         struct extent_state **cached, gfp_t mask);
 202int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 203int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 204                          get_extent_t *get_extent, int mirror_num);
 205int __init extent_io_init(void);
 206void extent_io_exit(void);
 207
 208u64 count_range_bits(struct extent_io_tree *tree,
 209                     u64 *start, u64 search_end,
 210                     u64 max_bytes, unsigned long bits, int contig);
 211
 212void free_extent_state(struct extent_state *state);
 213int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 214                   int bits, int filled, struct extent_state *cached_state);
 215int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 216                      int bits, gfp_t mask);
 217int 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);
 220int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 221                    int bits, gfp_t mask);
 222int 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);
 225int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 226                        struct extent_state **cached_state, gfp_t mask);
 227int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 228                          struct extent_state **cached_state, gfp_t mask);
 229int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 230                   gfp_t mask);
 231int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 232                     gfp_t mask);
 233int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 234                       gfp_t mask);
 235int 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);
 238int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 239                        struct extent_state **cached_state, gfp_t mask);
 240int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
 241                      struct extent_state **cached_state, gfp_t mask);
 242int 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);
 245struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 246                                                 u64 start, int bits);
 247int extent_invalidatepage(struct extent_io_tree *tree,
 248                          struct page *page, unsigned long offset);
 249int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 250                          get_extent_t *get_extent,
 251                          struct writeback_control *wbc);
 252int 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);
 255int extent_writepages(struct extent_io_tree *tree,
 256                      struct address_space *mapping,
 257                      get_extent_t *get_extent,
 258                      struct writeback_control *wbc);
 259int btree_write_cache_pages(struct address_space *mapping,
 260                            struct writeback_control *wbc);
 261int 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);
 265int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 266                __u64 start, __u64 len, get_extent_t *get_extent);
 267int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 268int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 269void set_page_extent_mapped(struct page *page);
 270
 271struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 272                                          u64 start, unsigned long len);
 273struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 274struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 275struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 276                                         u64 start, unsigned long len);
 277void free_extent_buffer(struct extent_buffer *eb);
 278void free_extent_buffer_stale(struct extent_buffer *eb);
 279#define WAIT_NONE       0
 280#define WAIT_COMPLETE   1
 281#define WAIT_PAGE_LOCK  2
 282int 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
 286static 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
 292static inline struct page *extent_buffer_page(struct extent_buffer *eb,
 293                                              unsigned long i)
 294{
 295        return eb->pages[i];
 296}
 297
 298static inline void extent_buffer_get(struct extent_buffer *eb)
 299{
 300        atomic_inc(&eb->refs);
 301}
 302
 303int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 304                          unsigned long start,
 305                          unsigned long len);
 306void read_extent_buffer(struct extent_buffer *eb, void *dst,
 307                        unsigned long start,
 308                        unsigned long len);
 309void write_extent_buffer(struct extent_buffer *eb, const void *src,
 310                         unsigned long start, unsigned long len);
 311void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 312                        unsigned long dst_offset, unsigned long src_offset,
 313                        unsigned long len);
 314void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 315                           unsigned long src_offset, unsigned long len);
 316void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 317                           unsigned long src_offset, unsigned long len);
 318void memset_extent_buffer(struct extent_buffer *eb, char c,
 319                          unsigned long start, unsigned long len);
 320void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 321void clear_extent_buffer_dirty(struct extent_buffer *eb);
 322int set_extent_buffer_dirty(struct extent_buffer *eb);
 323int set_extent_buffer_uptodate(struct extent_buffer *eb);
 324int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 325int extent_buffer_uptodate(struct extent_buffer *eb);
 326int 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);
 330int extent_range_uptodate(struct extent_io_tree *tree,
 331                          u64 start, u64 end);
 332int 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);
 336struct bio *
 337btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 338                gfp_t gfp_flags);
 339
 340struct btrfs_mapping_tree;
 341
 342int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
 343                        u64 length, u64 logical, struct page *page,
 344                        int mirror_num);
 345int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 346int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 347                         int mirror_num);
 348#endif
 349
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