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