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