LXR linux/fs/btrfs/extent

   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)(int rw, struct page *page, unsigned long offset,
  76                              size_t size, struct bio *bio,
  77                              unsigned long bio_flags);
  78        int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
  79        int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  80                                    struct extent_state *state, int mirror);
  81        int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  82                                      struct extent_state *state, int uptodate);
  83        void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  84                             unsigned long *bits);
  85        void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  86                               unsigned long *bits);
  87        void (*merge_extent_hook)(struct inode *inode,
  88                                  struct extent_state *new,
  89                                  struct extent_state *other);
  90        void (*split_extent_hook)(struct inode *inode,
  91                                  struct extent_state *orig, u64 split);
  92};
  93
  94struct extent_io_tree {
  95        struct rb_root state;
  96        struct radix_tree_root buffer;
  97        struct address_space *mapping;
  98        u64 dirty_bytes;
  99        int track_uptodate;
 100        spinlock_t lock;
 101        spinlock_t buffer_lock;
 102        struct extent_io_ops *ops;
 103};
 104
 105struct extent_state {
 106        u64 start;
 107        u64 end; /* inclusive */
 108        struct rb_node rb_node;
 109
 110        /* ADD NEW ELEMENTS AFTER THIS */
 111        struct extent_io_tree *tree;
 112        wait_queue_head_t wq;
 113        atomic_t refs;
 114        unsigned long state;
 115
 116        /* for use by the FS */
 117        u64 private;
 118
 119#ifdef CONFIG_BTRFS_DEBUG
 120        struct list_head leak_list;
 121#endif
 122};
 123
 124#define INLINE_EXTENT_BUFFER_PAGES 16
 125#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
 126struct extent_buffer {
 127        u64 start;
 128        unsigned long len;
 129        unsigned long map_start;
 130        unsigned long map_len;
 131        unsigned long bflags;
 132        struct extent_io_tree *tree;
 133        spinlock_t refs_lock;
 134        atomic_t refs;
 135        atomic_t io_pages;
 136        int read_mirror;
 137        struct rcu_head rcu_head;
 138        pid_t lock_owner;
 139
 140        /* count of read lock holders on the extent buffer */
 141        atomic_t write_locks;
 142        atomic_t read_locks;
 143        atomic_t blocking_writers;
 144        atomic_t blocking_readers;
 145        atomic_t spinning_readers;
 146        atomic_t spinning_writers;
 147        int lock_nested;
 148
 149        /* protects write locks */
 150        rwlock_t lock;
 151
 152        /* readers use lock_wq while they wait for the write
 153         * lock holders to unlock
 154         */
 155        wait_queue_head_t write_lock_wq;
 156
 157        /* writers use read_lock_wq while they wait for readers
 158         * to unlock
 159         */
 160        wait_queue_head_t read_lock_wq;
 161        wait_queue_head_t lock_wq;
 162        struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
 163#ifdef CONFIG_BTRFS_DEBUG
 164        struct list_head leak_list;
 165#endif
 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);
 193int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 194int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 195                     unsigned long bits, struct extent_state **cached);
 196int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 197int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 198                         struct extent_state **cached, gfp_t mask);
 199int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 200int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 201                          get_extent_t *get_extent, int mirror_num);
 202int __init extent_io_init(void);
 203void extent_io_exit(void);
 204
 205u64 count_range_bits(struct extent_io_tree *tree,
 206                     u64 *start, u64 search_end,
 207                     u64 max_bytes, unsigned long bits, int contig);
 208
 209void free_extent_state(struct extent_state *state);
 210int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 211                   unsigned long bits, int filled,
 212                   struct extent_state *cached_state);
 213int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 214                      unsigned long bits, gfp_t mask);
 215int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 216                     unsigned long bits, int wake, int delete,
 217                     struct extent_state **cached, gfp_t mask);
 218int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 219                    unsigned long bits, gfp_t mask);
 220int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 221                   unsigned long bits, u64 *failed_start,
 222                   struct extent_state **cached_state, gfp_t mask);
 223int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 224                        struct extent_state **cached_state, gfp_t mask);
 225int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 226                          struct extent_state **cached_state, gfp_t mask);
 227int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 228                   gfp_t mask);
 229int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 230                     gfp_t mask);
 231int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 232                       gfp_t mask);
 233int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 234                       unsigned long bits, unsigned long clear_bits,
 235                       struct extent_state **cached_state, gfp_t mask);
 236int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 237                        struct extent_state **cached_state, gfp_t mask);
 238int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
 239                      struct extent_state **cached_state, gfp_t mask);
 240int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 241                          u64 *start_ret, u64 *end_ret, unsigned long bits,
 242                          struct extent_state **cached_state);
 243int extent_invalidatepage(struct extent_io_tree *tree,
 244                          struct page *page, unsigned long offset);
 245int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 246                          get_extent_t *get_extent,
 247                          struct writeback_control *wbc);
 248int 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);
 251int extent_writepages(struct extent_io_tree *tree,
 252                      struct address_space *mapping,
 253                      get_extent_t *get_extent,
 254                      struct writeback_control *wbc);
 255int btree_write_cache_pages(struct address_space *mapping,
 256                            struct writeback_control *wbc);
 257int 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);
 261int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 262                __u64 start, __u64 len, get_extent_t *get_extent);
 263int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 264void extent_cache_csums_dio(struct extent_io_tree *tree, u64 start, u32 csums[],
 265                            int count);
 266void extent_cache_csums(struct extent_io_tree *tree, struct bio *bio,
 267                        int bvec_index, u32 csums[], int count);
 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);
 285void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 286
 287static inline unsigned long num_extent_pages(u64 start, u64 len)
 288{
 289        return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
 290                (start >> PAGE_CACHE_SHIFT);
 291}
 292
 293static inline struct page *extent_buffer_page(struct extent_buffer *eb,
 294                                              unsigned long i)
 295{
 296        return eb->pages[i];
 297}
 298
 299static inline void extent_buffer_get(struct extent_buffer *eb)
 300{
 301        atomic_inc(&eb->refs);
 302}
 303
 304int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 305                          unsigned long start,
 306                          unsigned long len);
 307void read_extent_buffer(struct extent_buffer *eb, void *dst,
 308                        unsigned long start,
 309                        unsigned long len);
 310void write_extent_buffer(struct extent_buffer *eb, const void *src,
 311                         unsigned long start, unsigned long len);
 312void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 313                        unsigned long dst_offset, unsigned long src_offset,
 314                        unsigned long len);
 315void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 316                           unsigned long src_offset, unsigned long len);
 317void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 318                           unsigned long src_offset, unsigned long len);
 319void memset_extent_buffer(struct extent_buffer *eb, char c,
 320                          unsigned long start, unsigned long len);
 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_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 331int extent_range_redirty_for_io(struct inode *inode, 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);
 339struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
 340struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
 341
 342struct btrfs_fs_info;
 343
 344int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
 345                        u64 length, u64 logical, struct page *page,
 346                        int mirror_num);
 347int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 348int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 349                         int mirror_num);
 350#endif
 351