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         int (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  80                             int *bits);
  81         int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  82                               int *bits);
  83         int (*merge_extent_hook)(struct inode *inode,
  84                                  struct extent_state *new,
  85                                  struct extent_state *other);
  86         int (*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         u64 split_start;
 112         u64 split_end;
 113
 114         /* for use by the FS */
 115         u64 private;
 116
 117         struct list_head leak_list;
 118 };
 119
 120 struct extent_buffer {
 121         u64 start;
 122         unsigned long len;
 123         unsigned long map_start;
 124         unsigned long map_len;
 125         struct page *first_page;
 126         unsigned long bflags;
 127         struct list_head leak_list;
 128         struct rcu_head rcu_head;
 129         atomic_t refs;
 130
 131         /* count of read lock holders on the extent buffer */
 132         atomic_t write_locks;
 133         atomic_t read_locks;
 134         atomic_t blocking_writers;
 135         atomic_t blocking_readers;
 136         atomic_t spinning_readers;
 137         atomic_t spinning_writers;
 138
 139         /* protects write locks */
 140         rwlock_t lock;
 141
 142         /* readers use lock_wq while they wait for the write
 143          * lock holders to unlock
 144          */
 145         wait_queue_head_t write_lock_wq;
 146
 147         /* writers use read_lock_wq while they wait for readers
 148          * to unlock
 149          */
 150         wait_queue_head_t read_lock_wq;
 151 };
 152
 153 static inline void extent_set_compress_type(unsigned long *bio_flags,
 154                                             int compress_type)
 155 {
 156         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 157 }
 158
 159 static inline int extent_compress_type(unsigned long bio_flags)
 160 {
 161         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 162 }
 163
 164 struct extent_map_tree;
 165
 166 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 167                                           struct page *page,
 168                                           size_t pg_offset,
 169                                           u64 start, u64 len,
 170                                           int create);
 171
 172 void extent_io_tree_init(struct extent_io_tree *tree,
 173                          struct address_space *mapping);
 174 int try_release_extent_mapping(struct extent_map_tree *map,
 175                                struct extent_io_tree *tree, struct page *page,
 176                                gfp_t mask);
 177 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 178 int try_release_extent_state(struct extent_map_tree *map,
 179                              struct extent_io_tree *tree, struct page *page,
 180                              gfp_t mask);
 181 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 182 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 183                      int bits, struct extent_state **cached, gfp_t mask);
 184 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 185 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 186                          struct extent_state **cached, gfp_t mask);
 187 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 188                     gfp_t mask);
 189 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 190                           get_extent_t *get_extent);
 191 int __init extent_io_init(void);
 192 void extent_io_exit(void);
 193
 194 u64 count_range_bits(struct extent_io_tree *tree,
 195                      u64 *start, u64 search_end,
 196                      u64 max_bytes, unsigned long bits, int contig);
 197
 198 void free_extent_state(struct extent_state *state);
 199 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 200                    int bits, int filled, struct extent_state *cached_state);
 201 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 202                       int bits, gfp_t mask);
 203 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 204                      int bits, int wake, int delete, struct extent_state **cached,
 205                      gfp_t mask);
 206 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 207                     int bits, gfp_t mask);
 208 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 209                    int bits, int exclusive_bits, u64 *failed_start,
 210                    struct extent_state **cached_state, gfp_t mask);
 211 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 212                         struct extent_state **cached_state, gfp_t mask);
 213 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 214                    gfp_t mask);
 215 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 216                      gfp_t mask);
 217 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 218                        gfp_t mask);
 219 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 220                         struct extent_state **cached_state, gfp_t mask);
 221 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 222                           u64 *start_ret, u64 *end_ret, int bits);
 223 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 224                                                  u64 start, int bits);
 225 int extent_invalidatepage(struct extent_io_tree *tree,
 226                           struct page *page, unsigned long offset);
 227 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 228                           get_extent_t *get_extent,
 229                           struct writeback_control *wbc);
 230 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 231                               u64 start, u64 end, get_extent_t *get_extent,
 232                               int mode);
 233 int extent_writepages(struct extent_io_tree *tree,
 234                       struct address_space *mapping,
 235                       get_extent_t *get_extent,
 236                       struct writeback_control *wbc);
 237 int extent_readpages(struct extent_io_tree *tree,
 238                      struct address_space *mapping,
 239                      struct list_head *pages, unsigned nr_pages,
 240                      get_extent_t get_extent);
 241 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 242                 __u64 start, __u64 len, get_extent_t *get_extent);
 243 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 244 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 245 void set_page_extent_mapped(struct page *page);
 246
 247 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 248                                           u64 start, unsigned long len,
 249                                           struct page *page0);
 250 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 251                                          u64 start, unsigned long len);
 252 void free_extent_buffer(struct extent_buffer *eb);
 253 int read_extent_buffer_pages(struct extent_io_tree *tree,
 254                              struct extent_buffer *eb, u64 start, int wait,
 255                              get_extent_t *get_extent, int mirror_num);
 256
 257 static inline void extent_buffer_get(struct extent_buffer *eb)
 258 {
 259         atomic_inc(&eb->refs);
 260 }
 261
 262 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 263                           unsigned long start,
 264                           unsigned long len);
 265 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 266                         unsigned long start,
 267                         unsigned long len);
 268 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 269                          unsigned long start, unsigned long len);
 270 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 271                         unsigned long dst_offset, unsigned long src_offset,
 272                         unsigned long len);
 273 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 274                            unsigned long src_offset, unsigned long len);
 275 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 276                            unsigned long src_offset, unsigned long len);
 277 void memset_extent_buffer(struct extent_buffer *eb, char c,
 278                           unsigned long start, unsigned long len);
 279 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 280 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 281                               struct extent_buffer *eb);
 282 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 283                              struct extent_buffer *eb);
 284 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 285                                struct extent_buffer *eb);
 286 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 287                                 struct extent_buffer *eb,
 288                                 struct extent_state **cached_state);
 289 int extent_buffer_uptodate(struct extent_io_tree *tree,
 290                            struct extent_buffer *eb,
 291                            struct extent_state *cached_state);
 292 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 293                       unsigned long min_len, char **map,
 294                       unsigned long *map_start,
 295                       unsigned long *map_len);
 296 int extent_range_uptodate(struct extent_io_tree *tree,
 297                           u64 start, u64 end);
 298 int extent_clear_unlock_delalloc(struct inode *inode,
 299                                 struct extent_io_tree *tree,
 300                                 u64 start, u64 end, struct page *locked_page,
 301                                 unsigned long op);
 302 struct bio *
 303 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 304                 gfp_t gfp_flags);
 305 #endif