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 /* flags for bio submission */
  24 #define EXTENT_BIO_COMPRESSED 1
  25
  26 /* these are bit numbers for test/set bit */
  27 #define EXTENT_BUFFER_UPTODATE 0
  28 #define EXTENT_BUFFER_BLOCKING 1
  29 #define EXTENT_BUFFER_DIRTY 2
  30
  31 /* these are flags for extent_clear_unlock_delalloc */
  32 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  33 #define EXTENT_CLEAR_UNLOCK      0x2
  34 #define EXTENT_CLEAR_DELALLOC    0x4
  35 #define EXTENT_CLEAR_DIRTY       0x8
  36 #define EXTENT_SET_WRITEBACK     0x10
  37 #define EXTENT_END_WRITEBACK     0x20
  38 #define EXTENT_SET_PRIVATE2      0x40
  39 #define EXTENT_CLEAR_ACCOUNTING  0x80
  40
  41 /*
  42  * page->private values.  Every page that is controlled by the extent
  43  * map has page->private set to one.
  44  */
  45 #define EXTENT_PAGE_PRIVATE 1
  46 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  47
  48 struct extent_state;
  49
  50 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  51                                        struct bio *bio, int mirror_num,
  52                                        unsigned long bio_flags, u64 bio_offset);
  53 struct extent_io_ops {
  54         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  55                              u64 start, u64 end, int *page_started,
  56                              unsigned long *nr_written);
  57         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  58         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  59         extent_submit_bio_hook_t *submit_bio_hook;
  60         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  61                               size_t size, struct bio *bio,
  62                               unsigned long bio_flags);
  63         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  64         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  65                                        u64 start, u64 end,
  66                                        struct extent_state *state);
  67         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  68                                         u64 start, u64 end,
  69                                        struct extent_state *state);
  70         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  71                                     struct extent_state *state);
  72         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  73                                       struct extent_state *state, int uptodate);
  74         int (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  75                             int *bits);
  76         int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  77                               int *bits);
  78         int (*merge_extent_hook)(struct inode *inode,
  79                                  struct extent_state *new,
  80                                  struct extent_state *other);
  81         int (*split_extent_hook)(struct inode *inode,
  82                                  struct extent_state *orig, u64 split);
  83         int (*write_cache_pages_lock_hook)(struct page *page);
  84 };
  85
  86 struct extent_io_tree {
  87         struct rb_root state;
  88         struct rb_root buffer;
  89         struct address_space *mapping;
  90         u64 dirty_bytes;
  91         spinlock_t lock;
  92         spinlock_t buffer_lock;
  93         struct extent_io_ops *ops;
  94 };
  95
  96 struct extent_state {
  97         u64 start;
  98         u64 end; /* inclusive */
  99         struct rb_node rb_node;
 100
 101         /* ADD NEW ELEMENTS AFTER THIS */
 102         struct extent_io_tree *tree;
 103         wait_queue_head_t wq;
 104         atomic_t refs;
 105         unsigned long state;
 106         u64 split_start;
 107         u64 split_end;
 108
 109         /* for use by the FS */
 110         u64 private;
 111
 112         struct list_head leak_list;
 113 };
 114
 115 struct extent_buffer {
 116         u64 start;
 117         unsigned long len;
 118         char *map_token;
 119         char *kaddr;
 120         unsigned long map_start;
 121         unsigned long map_len;
 122         struct page *first_page;
 123         unsigned long bflags;
 124         atomic_t refs;
 125         struct list_head leak_list;
 126         struct rb_node rb_node;
 127
 128         /* the spinlock is used to protect most operations */
 129         spinlock_t lock;
 130
 131         /*
 132          * when we keep the lock held while blocking, waiters go onto
 133          * the wq
 134          */
 135         wait_queue_head_t lock_wq;
 136 };
 137
 138 struct extent_map_tree;
 139
 140 static inline struct extent_state *extent_state_next(struct extent_state *state)
 141 {
 142         struct rb_node *node;
 143         node = rb_next(&state->rb_node);
 144         if (!node)
 145                 return NULL;
 146         return rb_entry(node, struct extent_state, rb_node);
 147 }
 148
 149 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 150                                           struct page *page,
 151                                           size_t page_offset,
 152                                           u64 start, u64 len,
 153                                           int create);
 154
 155 void extent_io_tree_init(struct extent_io_tree *tree,
 156                           struct address_space *mapping, gfp_t mask);
 157 int try_release_extent_mapping(struct extent_map_tree *map,
 158                                struct extent_io_tree *tree, struct page *page,
 159                                gfp_t mask);
 160 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 161 int try_release_extent_state(struct extent_map_tree *map,
 162                              struct extent_io_tree *tree, struct page *page,
 163                              gfp_t mask);
 164 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 165 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 166                      int bits, struct extent_state **cached, gfp_t mask);
 167 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 168 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 169                          struct extent_state **cached, gfp_t mask);
 170 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 171                     gfp_t mask);
 172 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 173                           get_extent_t *get_extent);
 174 int __init extent_io_init(void);
 175 void extent_io_exit(void);
 176
 177 u64 count_range_bits(struct extent_io_tree *tree,
 178                      u64 *start, u64 search_end,
 179                      u64 max_bytes, unsigned long bits);
 180
 181 void free_extent_state(struct extent_state *state);
 182 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 183                    int bits, int filled, struct extent_state *cached_state);
 184 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 185                       int bits, gfp_t mask);
 186 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 187                      int bits, int wake, int delete, struct extent_state **cached,
 188                      gfp_t mask);
 189 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 190                     int bits, gfp_t mask);
 191 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 192                    int bits, int exclusive_bits, u64 *failed_start,
 193                    struct extent_state **cached_state, gfp_t mask);
 194 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 195                         gfp_t mask);
 196 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 197                    gfp_t mask);
 198 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 199                      gfp_t mask);
 200 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 201                        gfp_t mask);
 202 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 203                        gfp_t mask);
 204 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
 205                                   u64 end, gfp_t mask);
 206 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 207                         struct extent_state **cached_state, gfp_t mask);
 208 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 209                      gfp_t mask);
 210 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 211                           u64 *start_ret, u64 *end_ret, int bits);
 212 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 213                                                  u64 start, int bits);
 214 int extent_invalidatepage(struct extent_io_tree *tree,
 215                           struct page *page, unsigned long offset);
 216 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 217                           get_extent_t *get_extent,
 218                           struct writeback_control *wbc);
 219 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 220                               u64 start, u64 end, get_extent_t *get_extent,
 221                               int mode);
 222 int extent_writepages(struct extent_io_tree *tree,
 223                       struct address_space *mapping,
 224                       get_extent_t *get_extent,
 225                       struct writeback_control *wbc);
 226 int extent_readpages(struct extent_io_tree *tree,
 227                      struct address_space *mapping,
 228                      struct list_head *pages, unsigned nr_pages,
 229                      get_extent_t get_extent);
 230 int extent_prepare_write(struct extent_io_tree *tree,
 231                          struct inode *inode, struct page *page,
 232                          unsigned from, unsigned to, get_extent_t *get_extent);
 233 int extent_commit_write(struct extent_io_tree *tree,
 234                         struct inode *inode, struct page *page,
 235                         unsigned from, unsigned to);
 236 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 237                 get_extent_t *get_extent);
 238 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 239                 __u64 start, __u64 len, get_extent_t *get_extent);
 240 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 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                                           gfp_t mask);
 249 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 250                                          u64 start, unsigned long len,
 251                                           gfp_t mask);
 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_on_extent_buffer_writeback(struct extent_io_tree *tree,
 280                                     struct extent_buffer *eb);
 281 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
 282 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 283 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 284                               struct extent_buffer *eb);
 285 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 286                              struct extent_buffer *eb);
 287 int test_extent_buffer_dirty(struct extent_io_tree *tree,
 288                              struct extent_buffer *eb);
 289 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 290                                struct extent_buffer *eb);
 291 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 292                                 struct extent_buffer *eb,
 293                                 struct extent_state **cached_state);
 294 int extent_buffer_uptodate(struct extent_io_tree *tree,
 295                            struct extent_buffer *eb,
 296                            struct extent_state *cached_state);
 297 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 298                       unsigned long min_len, char **token, char **map,
 299                       unsigned long *map_start,
 300                       unsigned long *map_len, int km);
 301 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 302                       unsigned long min_len, char **token, char **map,
 303                       unsigned long *map_start,
 304                       unsigned long *map_len, int km);
 305 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 306 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
 307 int extent_range_uptodate(struct extent_io_tree *tree,
 308                           u64 start, u64 end);
 309 int extent_clear_unlock_delalloc(struct inode *inode,
 310                                 struct extent_io_tree *tree,
 311                                 u64 start, u64 end, struct page *locked_page,
 312                                 unsigned long op);
 313 #endif