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_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
  61struct extent_state;
  62struct btrfs_root;
  63
  64typedef 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);
  67struct 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 (*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                             int *bits);
  85        void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  86                               int *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        int (*write_cache_pages_lock_hook)(struct page *page, void *data,
  93                                           void (*flush_fn)(void *));
  94};
  95
  96struct extent_io_tree {
  97        struct rb_root state;
  98        struct radix_tree_root buffer;
  99        struct address_space *mapping;
 100        u64 dirty_bytes;
 101        int track_uptodate;
 102        spinlock_t lock;
 103        spinlock_t buffer_lock;
 104        struct extent_io_ops *ops;
 105};
 106
 107struct extent_state {
 108        u64 start;
 109        u64 end; /* inclusive */
 110        struct rb_node rb_node;
 111
 112        /* ADD NEW ELEMENTS AFTER THIS */
 113        struct extent_io_tree *tree;
 114        wait_queue_head_t wq;
 115        atomic_t refs;
 116        unsigned long state;
 117
 118        /* for use by the FS */
 119        u64 private;
 120
 121        struct list_head leak_list;
 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 list_head leak_list;
 138        struct rcu_head rcu_head;
 139        pid_t lock_owner;
 140
 141        /* count of read lock holders on the extent buffer */
 142        atomic_t write_locks;
 143        atomic_t read_locks;
 144        atomic_t blocking_writers;
 145        atomic_t blocking_readers;
 146        atomic_t spinning_readers;
 147        atomic_t spinning_writers;
 148        int lock_nested;
 149
 150        /* protects write locks */
 151        rwlock_t lock;
 152
 153        /* readers use lock_wq while they wait for the write
 154         * lock holders to unlock
 155         */
 156        wait_queue_head_t write_lock_wq;
 157
 158        /* writers use read_lock_wq while they wait for readers
 159         * to unlock
 160         */
 161        wait_queue_head_t read_lock_wq;
 162        wait_queue_head_t lock_wq;
 163        struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES];
 164        struct page **pages;
 165};
 166
 167static inline void extent_set_compress_type(unsigned long *bio_flags,
 168                                            int compress_type)
 169{
 170        *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 171}
 172
 173static inline int extent_compress_type(unsigned long bio_flags)
 174{
 175        return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 176}
 177
 178struct extent_map_tree;
 179
 180typedef struct extent_map *(get_extent_t)(struct inode *inode,
 181                                          struct page *page,
 182                                          size_t pg_offset,
 183                                          u64 start, u64 len,
 184                                          int create);
 185
 186void extent_io_tree_init(struct extent_io_tree *tree,
 187                         struct address_space *mapping);
 188int try_release_extent_mapping(struct extent_map_tree *map,
 189                               struct extent_io_tree *tree, struct page *page,
 190                               gfp_t mask);
 191int try_release_extent_buffer(struct page *page, gfp_t mask);
 192int try_release_extent_state(struct extent_map_tree *map,
 193                             struct extent_io_tree *tree, struct page *page,
 194                             gfp_t mask);
 195int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 196int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 197                     int bits, struct extent_state **cached);
 198int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 199int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 200                         struct extent_state **cached, gfp_t mask);
 201int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
 202int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 203                          get_extent_t *get_extent, int mirror_num);
 204int __init extent_io_init(void);
 205void extent_io_exit(void);
 206
 207u64 count_range_bits(struct extent_io_tree *tree,
 208                     u64 *start, u64 search_end,
 209                     u64 max_bytes, unsigned long bits, int contig);
 210
 211void free_extent_state(struct extent_state *state);
 212int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 213                   int bits, int filled, struct extent_state *cached_state);
 214int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 215                      int bits, gfp_t mask);
 216int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 217                     int bits, int wake, int delete, struct extent_state **cached,
 218                     gfp_t mask);
 219int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 220                    int bits, gfp_t mask);
 221int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 222                   int bits, u64 *failed_start,
 223                   struct extent_state **cached_state, gfp_t mask);
 224int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 225                        struct extent_state **cached_state, gfp_t mask);
 226int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 227                          struct extent_state **cached_state, gfp_t mask);
 228int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 229                   gfp_t mask);
 230int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 231                     gfp_t mask);
 232int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 233                       gfp_t mask);
 234int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 235                       int bits, int clear_bits, 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 find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 239                          u64 *start_ret, u64 *end_ret, int bits);
 240struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 241                                                 u64 start, int bits);
 242int extent_invalidatepage(struct extent_io_tree *tree,
 243                          struct page *page, unsigned long offset);
 244int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 245                          get_extent_t *get_extent,
 246                          struct writeback_control *wbc);
 247int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 248                              u64 start, u64 end, get_extent_t *get_extent,
 249                              int mode);
 250int extent_writepages(struct extent_io_tree *tree,
 251                      struct address_space *mapping,
 252                      get_extent_t *get_extent,
 253                      struct writeback_control *wbc);
 254int btree_write_cache_pages(struct address_space *mapping,
 255                            struct writeback_control *wbc);
 256int extent_readpages(struct extent_io_tree *tree,
 257                     struct address_space *mapping,
 258                     struct list_head *pages, unsigned nr_pages,
 259                     get_extent_t get_extent);
 260int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 261                __u64 start, __u64 len, get_extent_t *get_extent);
 262int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 263int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 264void set_page_extent_mapped(struct page *page);
 265
 266struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 267                                          u64 start, unsigned long len);
 268struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
 269struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 270struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 271                                         u64 start, unsigned long len);
 272void free_extent_buffer(struct extent_buffer *eb);
 273void free_extent_buffer_stale(struct extent_buffer *eb);
 274#define WAIT_NONE       0
 275#define WAIT_COMPLETE   1
 276#define WAIT_PAGE_LOCK  2
 277int read_extent_buffer_pages(struct extent_io_tree *tree,
 278                             struct extent_buffer *eb, u64 start, int wait,
 279                             get_extent_t *get_extent, int mirror_num);
 280unsigned long num_extent_pages(u64 start, u64 len);
 281struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
 282
 283static inline void extent_buffer_get(struct extent_buffer *eb)
 284{
 285        atomic_inc(&eb->refs);
 286}
 287
 288int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 289                          unsigned long start,
 290                          unsigned long len);
 291void read_extent_buffer(struct extent_buffer *eb, void *dst,
 292                        unsigned long start,
 293                        unsigned long len);
 294void write_extent_buffer(struct extent_buffer *eb, const void *src,
 295                         unsigned long start, unsigned long len);
 296void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 297                        unsigned long dst_offset, unsigned long src_offset,
 298                        unsigned long len);
 299void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 300                           unsigned long src_offset, unsigned long len);
 301void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 302                           unsigned long src_offset, unsigned long len);
 303void memset_extent_buffer(struct extent_buffer *eb, char c,
 304                          unsigned long start, unsigned long len);
 305void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 306void clear_extent_buffer_dirty(struct extent_buffer *eb);
 307int set_extent_buffer_dirty(struct extent_buffer *eb);
 308int set_extent_buffer_uptodate(struct extent_buffer *eb);
 309int clear_extent_buffer_uptodate(struct extent_buffer *eb);
 310int extent_buffer_uptodate(struct extent_buffer *eb);
 311int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 312                      unsigned long min_len, char **map,
 313                      unsigned long *map_start,
 314                      unsigned long *map_len);
 315int extent_range_uptodate(struct extent_io_tree *tree,
 316                          u64 start, u64 end);
 317int extent_clear_unlock_delalloc(struct inode *inode,
 318                                struct extent_io_tree *tree,
 319                                u64 start, u64 end, struct page *locked_page,
 320                                unsigned long op);
 321struct bio *
 322btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 323                gfp_t gfp_flags);
 324
 325struct btrfs_mapping_tree;
 326
 327int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
 328                        u64 length, u64 logical, struct page *page,
 329                        int mirror_num);
 330int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
 331int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
 332                         int mirror_num);
 333#endif
 334
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