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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  22 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
  23
  24 /*
  25  * flags for bio submission. The high bits indicate the compression
  26  * type for this bio
  27  */
  28 #define EXTENT_BIO_COMPRESSED 1
  29 #define EXTENT_BIO_FLAG_SHIFT 16
  30
  31 /* these are bit numbers for test/set bit */
  32 #define EXTENT_BUFFER_UPTODATE 0
  33 #define EXTENT_BUFFER_BLOCKING 1
  34 #define EXTENT_BUFFER_DIRTY 2
  35 #define EXTENT_BUFFER_CORRUPT 3
  36 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
  37
  38 /* these are flags for extent_clear_unlock_delalloc */
  39 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  40 #define EXTENT_CLEAR_UNLOCK      0x2
  41 #define EXTENT_CLEAR_DELALLOC    0x4
  42 #define EXTENT_CLEAR_DIRTY       0x8
  43 #define EXTENT_SET_WRITEBACK     0x10
  44 #define EXTENT_END_WRITEBACK     0x20
  45 #define EXTENT_SET_PRIVATE2      0x40
  46 #define EXTENT_CLEAR_ACCOUNTING  0x80
  47
  48 /*
  49  * page->private values.  Every page that is controlled by the extent
  50  * map has page->private set to one.
  51  */
  52 #define EXTENT_PAGE_PRIVATE 1
  53 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  54
  55 struct extent_state;
  56
  57 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  58                                        struct bio *bio, int mirror_num,
  59                                        unsigned long bio_flags, u64 bio_offset);
  60 struct extent_io_ops {
  61         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  62                              u64 start, u64 end, int *page_started,
  63                              unsigned long *nr_written);
  64         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  65         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  66         extent_submit_bio_hook_t *submit_bio_hook;
  67         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  68                               size_t size, struct bio *bio,
  69                               unsigned long bio_flags);
  70         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  71         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  72                                        u64 start, u64 end,
  73                                        struct extent_state *state);
  74         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  75                                         u64 start, u64 end,
  76                                        struct extent_state *state);
  77         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  78                                     struct extent_state *state);
  79         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  80                                       struct extent_state *state, int uptodate);
  81         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  82                              int *bits);
  83         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  84                                int *bits);
  85         void (*merge_extent_hook)(struct inode *inode,
  86                                   struct extent_state *new,
  87                                   struct extent_state *other);
  88         void (*split_extent_hook)(struct inode *inode,
  89                                   struct extent_state *orig, u64 split);
  90         int (*write_cache_pages_lock_hook)(struct page *page, void *data,
  91                                            void (*flush_fn)(void *));
  92 };
  93
  94 struct extent_io_tree {
  95         struct rb_root state;
  96         struct radix_tree_root buffer;
  97         struct address_space *mapping;
  98         u64 dirty_bytes;
  99         spinlock_t lock;
 100         spinlock_t buffer_lock;
 101         struct extent_io_ops *ops;
 102 };
 103
 104 struct extent_state {
 105         u64 start;
 106         u64 end; /* inclusive */
 107         struct rb_node rb_node;
 108
 109         /* ADD NEW ELEMENTS AFTER THIS */
 110         struct extent_io_tree *tree;
 111         wait_queue_head_t wq;
 112         atomic_t refs;
 113         unsigned long state;
 114
 115         /* for use by the FS */
 116         u64 private;
 117
 118         struct list_head leak_list;
 119 };
 120
 121 struct extent_buffer {
 122         u64 start;
 123         unsigned long len;
 124         unsigned long map_start;
 125         unsigned long map_len;
 126         struct page *first_page;
 127         unsigned long bflags;
 128         struct list_head leak_list;
 129         struct rcu_head rcu_head;
 130         atomic_t refs;
 131
 132         /* count of read lock holders on the extent buffer */
 133         atomic_t write_locks;
 134         atomic_t read_locks;
 135         atomic_t blocking_writers;
 136         atomic_t blocking_readers;
 137         atomic_t spinning_readers;
 138         atomic_t spinning_writers;
 139
 140         /* protects write locks */
 141         rwlock_t lock;
 142
 143         /* readers use lock_wq while they wait for the write
 144          * lock holders to unlock
 145          */
 146         wait_queue_head_t write_lock_wq;
 147
 148         /* writers use read_lock_wq while they wait for readers
 149          * to unlock
 150          */
 151         wait_queue_head_t read_lock_wq;
 152 };
 153
 154 static inline void extent_set_compress_type(unsigned long *bio_flags,
 155                                             int compress_type)
 156 {
 157         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 158 }
 159
 160 static inline int extent_compress_type(unsigned long bio_flags)
 161 {
 162         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 163 }
 164
 165 struct extent_map_tree;
 166
 167 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 168                                           struct page *page,
 169                                           size_t pg_offset,
 170                                           u64 start, u64 len,
 171                                           int create);
 172
 173 void extent_io_tree_init(struct extent_io_tree *tree,
 174                          struct address_space *mapping);
 175 int try_release_extent_mapping(struct extent_map_tree *map,
 176                                struct extent_io_tree *tree, struct page *page,
 177                                gfp_t mask);
 178 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 179 int try_release_extent_state(struct extent_map_tree *map,
 180                              struct extent_io_tree *tree, struct page *page,
 181                              gfp_t mask);
 182 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 183 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 184                      int bits, struct extent_state **cached, gfp_t mask);
 185 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 186 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 187                          struct extent_state **cached, gfp_t mask);
 188 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 189                     gfp_t mask);
 190 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 191                           get_extent_t *get_extent);
 192 int __init extent_io_init(void);
 193 void extent_io_exit(void);
 194
 195 u64 count_range_bits(struct extent_io_tree *tree,
 196                      u64 *start, u64 search_end,
 197                      u64 max_bytes, unsigned long bits, int contig);
 198
 199 void free_extent_state(struct extent_state *state);
 200 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 201                    int bits, int filled, struct extent_state *cached_state);
 202 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 203                       int bits, gfp_t mask);
 204 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 205                      int bits, int wake, int delete, struct extent_state **cached,
 206                      gfp_t mask);
 207 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 208                     int bits, gfp_t mask);
 209 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 210                    int bits, int exclusive_bits, u64 *failed_start,
 211                    struct extent_state **cached_state, gfp_t mask);
 212 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 213                         struct extent_state **cached_state, gfp_t mask);
 214 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 215                    gfp_t mask);
 216 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 217                      gfp_t mask);
 218 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 219                        gfp_t mask);
 220 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 221                        int bits, int clear_bits, gfp_t mask);
 222 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 223                         struct extent_state **cached_state, gfp_t mask);
 224 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 225                           u64 *start_ret, u64 *end_ret, int bits);
 226 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 227                                                  u64 start, int bits);
 228 int extent_invalidatepage(struct extent_io_tree *tree,
 229                           struct page *page, unsigned long offset);
 230 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 231                           get_extent_t *get_extent,
 232                           struct writeback_control *wbc);
 233 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 234                               u64 start, u64 end, get_extent_t *get_extent,
 235                               int mode);
 236 int extent_writepages(struct extent_io_tree *tree,
 237                       struct address_space *mapping,
 238                       get_extent_t *get_extent,
 239                       struct writeback_control *wbc);
 240 int extent_readpages(struct extent_io_tree *tree,
 241                      struct address_space *mapping,
 242                      struct list_head *pages, unsigned nr_pages,
 243                      get_extent_t get_extent);
 244 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 245                 __u64 start, __u64 len, get_extent_t *get_extent);
 246 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 247 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 248 void set_page_extent_mapped(struct page *page);
 249
 250 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 251                                           u64 start, unsigned long len,
 252                                           struct page *page0);
 253 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 254                                          u64 start, unsigned long len);
 255 void free_extent_buffer(struct extent_buffer *eb);
 256 #define WAIT_NONE       0
 257 #define WAIT_COMPLETE   1
 258 #define WAIT_PAGE_LOCK  2
 259 int read_extent_buffer_pages(struct extent_io_tree *tree,
 260                              struct extent_buffer *eb, u64 start, int wait,
 261                              get_extent_t *get_extent, int mirror_num);
 262
 263 static inline void extent_buffer_get(struct extent_buffer *eb)
 264 {
 265         atomic_inc(&eb->refs);
 266 }
 267
 268 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 269                           unsigned long start,
 270                           unsigned long len);
 271 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 272                         unsigned long start,
 273                         unsigned long len);
 274 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 275                          unsigned long start, unsigned long len);
 276 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 277                         unsigned long dst_offset, unsigned long src_offset,
 278                         unsigned long len);
 279 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 280                            unsigned long src_offset, unsigned long len);
 281 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 282                            unsigned long src_offset, unsigned long len);
 283 void memset_extent_buffer(struct extent_buffer *eb, char c,
 284                           unsigned long start, unsigned long len);
 285 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 286 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 287                               struct extent_buffer *eb);
 288 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 289                              struct extent_buffer *eb);
 290 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 291                                struct extent_buffer *eb);
 292 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 293                                 struct extent_buffer *eb,
 294                                 struct extent_state **cached_state);
 295 int extent_buffer_uptodate(struct extent_io_tree *tree,
 296                            struct extent_buffer *eb,
 297                            struct extent_state *cached_state);
 298 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 299                       unsigned long min_len, char **map,
 300                       unsigned long *map_start,
 301                       unsigned long *map_len);
 302 int extent_range_uptodate(struct extent_io_tree *tree,
 303                           u64 start, u64 end);
 304 int extent_clear_unlock_delalloc(struct inode *inode,
 305                                 struct extent_io_tree *tree,
 306                                 u64 start, u64 end, struct page *locked_page,
 307                                 unsigned long op);
 308 struct bio *
 309 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 310                 gfp_t gfp_flags);
 311 #endif