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_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
  39/* these are flags for extent_clear_unlock_delalloc */
  40#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  41#define EXTENT_CLEAR_UNLOCK      0x2
  42#define EXTENT_CLEAR_DELALLOC    0x4
  43#define EXTENT_CLEAR_DIRTY       0x8
  44#define EXTENT_SET_WRITEBACK     0x10
  45#define EXTENT_END_WRITEBACK     0x20
  46#define EXTENT_SET_PRIVATE2      0x40
  47#define EXTENT_CLEAR_ACCOUNTING  0x80
  48
  49/*
  50 * page->private values.  Every page that is controlled by the extent
  51 * map has page->private set to one.
  52 */
  53#define EXTENT_PAGE_PRIVATE 1
  54#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  55
  56struct extent_state;
  57
  58typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  59                                       struct bio *bio, int mirror_num,
  60                                       unsigned long bio_flags, u64 bio_offset);
  61struct extent_io_ops {
  62        int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  63                             u64 start, u64 end, int *page_started,
  64                             unsigned long *nr_written);
  65        int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  66        int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  67        extent_submit_bio_hook_t *submit_bio_hook;
  68        int (*merge_bio_hook)(struct page *page, unsigned long offset,
  69                              size_t size, struct bio *bio,
  70                              unsigned long bio_flags);
  71        int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  72        int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  73                                       u64 start, u64 end, int failed_mirror,
  74                                       struct extent_state *state);
  75        int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  76                                        u64 start, u64 end,
  77                                       struct extent_state *state);
  78        int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  79                                    struct extent_state *state);
  80        int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  81                                      struct extent_state *state, int uptodate);
  82        void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  83                             int *bits);
  84        void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  85                               int *bits);
  86        void (*merge_extent_hook)(struct inode *inode,
  87                                  struct extent_state *new,
  88                                  struct extent_state *other);
  89        void (*split_extent_hook)(struct inode *inode,
  90                                  struct extent_state *orig, u64 split);
  91        int (*write_cache_pages_lock_hook)(struct page *page, void *data,
  92                                           void (*flush_fn)(void *));
  93};
  94
  95struct extent_io_tree {
  96        struct rb_root state;
  97        struct radix_tree_root buffer;
  98        struct address_space *mapping;
  99        u64 dirty_bytes;
 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        struct list_head leak_list;
 120};
 121
 122struct extent_buffer {
 123        u64 start;
 124        unsigned long len;
 125        unsigned long map_start;
 126        unsigned long map_len;
 127        struct page *first_page;
 128        unsigned long bflags;
 129        struct list_head leak_list;
 130        struct rcu_head rcu_head;
 131        atomic_t refs;
 132
 133        /* count of read lock holders on the extent buffer */
 134        atomic_t write_locks;
 135        atomic_t read_locks;
 136        atomic_t blocking_writers;
 137        atomic_t blocking_readers;
 138        atomic_t spinning_readers;
 139        atomic_t spinning_writers;
 140
 141        /* protects write locks */
 142        rwlock_t lock;
 143
 144        /* readers use lock_wq while they wait for the write
 145         * lock holders to unlock
 146         */
 147        wait_queue_head_t write_lock_wq;
 148
 149        /* writers use read_lock_wq while they wait for readers
 150         * to unlock
 151         */
 152        wait_queue_head_t read_lock_wq;
 153};
 154
 155static inline void extent_set_compress_type(unsigned long *bio_flags,
 156                                            int compress_type)
 157{
 158        *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 159}
 160
 161static inline int extent_compress_type(unsigned long bio_flags)
 162{
 163        return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 164}
 165
 166struct extent_map_tree;
 167
 168typedef struct extent_map *(get_extent_t)(struct inode *inode,
 169                                          struct page *page,
 170                                          size_t pg_offset,
 171                                          u64 start, u64 len,
 172                                          int create);
 173
 174void extent_io_tree_init(struct extent_io_tree *tree,
 175                         struct address_space *mapping);
 176int try_release_extent_mapping(struct extent_map_tree *map,
 177                               struct extent_io_tree *tree, struct page *page,
 178                               gfp_t mask);
 179int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 180int try_release_extent_state(struct extent_map_tree *map,
 181                             struct extent_io_tree *tree, struct page *page,
 182                             gfp_t mask);
 183int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 184int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 185                     int bits, struct extent_state **cached, gfp_t mask);
 186int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 187int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 188                         struct extent_state **cached, gfp_t mask);
 189int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 190                    gfp_t mask);
 191int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 192                          get_extent_t *get_extent, int mirror_num);
 193int __init extent_io_init(void);
 194void extent_io_exit(void);
 195
 196u64 count_range_bits(struct extent_io_tree *tree,
 197                     u64 *start, u64 search_end,
 198                     u64 max_bytes, unsigned long bits, int contig);
 199
 200void free_extent_state(struct extent_state *state);
 201int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 202                   int bits, int filled, struct extent_state *cached_state);
 203int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 204                      int bits, gfp_t mask);
 205int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 206                     int bits, int wake, int delete, struct extent_state **cached,
 207                     gfp_t mask);
 208int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 209                    int bits, gfp_t mask);
 210int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 211                   int bits, int exclusive_bits, u64 *failed_start,
 212                   struct extent_state **cached_state, gfp_t mask);
 213int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 214                        struct extent_state **cached_state, gfp_t mask);
 215int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 216                   gfp_t mask);
 217int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 218                     gfp_t mask);
 219int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 220                       gfp_t mask);
 221int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 222                       int bits, int clear_bits, gfp_t mask);
 223int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 224                        struct extent_state **cached_state, gfp_t mask);
 225int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 226                          u64 *start_ret, u64 *end_ret, int bits);
 227struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 228                                                 u64 start, int bits);
 229int extent_invalidatepage(struct extent_io_tree *tree,
 230                          struct page *page, unsigned long offset);
 231int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 232                          get_extent_t *get_extent,
 233                          struct writeback_control *wbc);
 234int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 235                              u64 start, u64 end, get_extent_t *get_extent,
 236                              int mode);
 237int extent_writepages(struct extent_io_tree *tree,
 238                      struct address_space *mapping,
 239                      get_extent_t *get_extent,
 240                      struct writeback_control *wbc);
 241int extent_readpages(struct extent_io_tree *tree,
 242                     struct address_space *mapping,
 243                     struct list_head *pages, unsigned nr_pages,
 244                     get_extent_t get_extent);
 245int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 246                __u64 start, __u64 len, get_extent_t *get_extent);
 247int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 248int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 249void set_page_extent_mapped(struct page *page);
 250
 251struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 252                                          u64 start, unsigned long len,
 253                                          struct page *page0);
 254struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 255                                         u64 start, unsigned long len);
 256void free_extent_buffer(struct extent_buffer *eb);
 257#define WAIT_NONE       0
 258#define WAIT_COMPLETE   1
 259#define WAIT_PAGE_LOCK  2
 260int read_extent_buffer_pages(struct extent_io_tree *tree,
 261                             struct extent_buffer *eb, u64 start, int wait,
 262                             get_extent_t *get_extent, int mirror_num);
 263unsigned long num_extent_pages(u64 start, u64 len);
 264struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
 265
 266static inline void extent_buffer_get(struct extent_buffer *eb)
 267{
 268        atomic_inc(&eb->refs);
 269}
 270
 271int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 272                          unsigned long start,
 273                          unsigned long len);
 274void read_extent_buffer(struct extent_buffer *eb, void *dst,
 275                        unsigned long start,
 276                        unsigned long len);
 277void write_extent_buffer(struct extent_buffer *eb, const void *src,
 278                         unsigned long start, unsigned long len);
 279void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 280                        unsigned long dst_offset, unsigned long src_offset,
 281                        unsigned long len);
 282void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 283                           unsigned long src_offset, unsigned long len);
 284void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 285                           unsigned long src_offset, unsigned long len);
 286void memset_extent_buffer(struct extent_buffer *eb, char c,
 287                          unsigned long start, unsigned long len);
 288int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 289int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 290                              struct extent_buffer *eb);
 291int set_extent_buffer_dirty(struct extent_io_tree *tree,
 292                             struct extent_buffer *eb);
 293int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 294                               struct extent_buffer *eb);
 295int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 296                                struct extent_buffer *eb,
 297                                struct extent_state **cached_state);
 298int extent_buffer_uptodate(struct extent_io_tree *tree,
 299                           struct extent_buffer *eb,
 300                           struct extent_state *cached_state);
 301int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 302                      unsigned long min_len, char **map,
 303                      unsigned long *map_start,
 304                      unsigned long *map_len);
 305int extent_range_uptodate(struct extent_io_tree *tree,
 306                          u64 start, u64 end);
 307int extent_clear_unlock_delalloc(struct inode *inode,
 308                                struct extent_io_tree *tree,
 309                                u64 start, u64 end, struct page *locked_page,
 310                                unsigned long op);
 311struct bio *
 312btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 313                gfp_t gfp_flags);
 314
 315struct btrfs_mapping_tree;
 316
 317int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
 318                        u64 length, u64 logical, struct page *page,
 319                        int mirror_num);
 320#endif
 321