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_ORDERED (1 << 9)
  17 #define EXTENT_ORDERED_METADATA (1 << 10)
  18 #define EXTENT_BOUNDARY (1 << 11)
  19 #define EXTENT_NODATASUM (1 << 12)
  20 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  21
  22 /* flags for bio submission */
  23 #define EXTENT_BIO_COMPRESSED 1
  24
  25 /* these are bit numbers for test/set bit */
  26 #define EXTENT_BUFFER_UPTODATE 0
  27 #define EXTENT_BUFFER_BLOCKING 1
  28 #define EXTENT_BUFFER_DIRTY 2
  29
  30 /*
  31  * page->private values.  Every page that is controlled by the extent
  32  * map has page->private set to one.
  33  */
  34 #define EXTENT_PAGE_PRIVATE 1
  35 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  36
  37 struct extent_state;
  38
  39 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  40                                        struct bio *bio, int mirror_num,
  41                                        unsigned long bio_flags);
  42 struct extent_io_ops {
  43         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  44                              u64 start, u64 end, int *page_started,
  45                              unsigned long *nr_written);
  46         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  47         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  48         extent_submit_bio_hook_t *submit_bio_hook;
  49         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  50                               size_t size, struct bio *bio,
  51                               unsigned long bio_flags);
  52         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  53         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  54                                        u64 start, u64 end,
  55                                        struct extent_state *state);
  56         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  57                                         u64 start, u64 end,
  58                                        struct extent_state *state);
  59         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  60                                     struct extent_state *state);
  61         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  62                                       struct extent_state *state, int uptodate);
  63         int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
  64                             unsigned long old, unsigned long bits);
  65         int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
  66                             unsigned long old, unsigned long bits);
  67         int (*write_cache_pages_lock_hook)(struct page *page);
  68 };
  69
  70 struct extent_io_tree {
  71         struct rb_root state;
  72         struct rb_root buffer;
  73         struct address_space *mapping;
  74         u64 dirty_bytes;
  75         spinlock_t lock;
  76         spinlock_t buffer_lock;
  77         struct extent_io_ops *ops;
  78 };
  79
  80 struct extent_state {
  81         u64 start;
  82         u64 end; /* inclusive */
  83         struct rb_node rb_node;
  84         struct extent_io_tree *tree;
  85         wait_queue_head_t wq;
  86         atomic_t refs;
  87         unsigned long state;
  88
  89         /* for use by the FS */
  90         u64 private;
  91
  92         struct list_head leak_list;
  93 };
  94
  95 struct extent_buffer {
  96         u64 start;
  97         unsigned long len;
  98         char *map_token;
  99         char *kaddr;
 100         unsigned long map_start;
 101         unsigned long map_len;
 102         struct page *first_page;
 103         unsigned long bflags;
 104         atomic_t refs;
 105         struct list_head leak_list;
 106         struct rb_node rb_node;
 107
 108         /* the spinlock is used to protect most operations */
 109         spinlock_t lock;
 110
 111         /*
 112          * when we keep the lock held while blocking, waiters go onto
 113          * the wq
 114          */
 115         wait_queue_head_t lock_wq;
 116 };
 117
 118 struct extent_map_tree;
 119
 120 static inline struct extent_state *extent_state_next(struct extent_state *state)
 121 {
 122         struct rb_node *node;
 123         node = rb_next(&state->rb_node);
 124         if (!node)
 125                 return NULL;
 126         return rb_entry(node, struct extent_state, rb_node);
 127 }
 128
 129 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 130                                           struct page *page,
 131                                           size_t page_offset,
 132                                           u64 start, u64 len,
 133                                           int create);
 134
 135 void extent_io_tree_init(struct extent_io_tree *tree,
 136                           struct address_space *mapping, gfp_t mask);
 137 int try_release_extent_mapping(struct extent_map_tree *map,
 138                                struct extent_io_tree *tree, struct page *page,
 139                                gfp_t mask);
 140 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 141 int try_release_extent_state(struct extent_map_tree *map,
 142                              struct extent_io_tree *tree, struct page *page,
 143                              gfp_t mask);
 144 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 145 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 146                      int bits, struct extent_state **cached, gfp_t mask);
 147 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 148 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 149                     gfp_t mask);
 150 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 151                           get_extent_t *get_extent);
 152 int __init extent_io_init(void);
 153 void extent_io_exit(void);
 154
 155 u64 count_range_bits(struct extent_io_tree *tree,
 156                      u64 *start, u64 search_end,
 157                      u64 max_bytes, unsigned long bits);
 158
 159 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 160                    int bits, int filled, struct extent_state *cached_state);
 161 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 162                       int bits, gfp_t mask);
 163 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 164                      int bits, int wake, int delete, struct extent_state **cached,
 165                      gfp_t mask);
 166 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 167                     int bits, gfp_t mask);
 168 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 169                         gfp_t mask);
 170 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 171                    gfp_t mask);
 172 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 173                      gfp_t mask);
 174 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 175                        gfp_t mask);
 176 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 177                        gfp_t mask);
 178 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
 179                                   u64 end, gfp_t mask);
 180 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 181                      gfp_t mask);
 182 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 183                      gfp_t mask);
 184 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 185                           u64 *start_ret, u64 *end_ret, int bits);
 186 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 187                                                  u64 start, int bits);
 188 int extent_invalidatepage(struct extent_io_tree *tree,
 189                           struct page *page, unsigned long offset);
 190 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 191                           get_extent_t *get_extent,
 192                           struct writeback_control *wbc);
 193 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 194                               u64 start, u64 end, get_extent_t *get_extent,
 195                               int mode);
 196 int extent_writepages(struct extent_io_tree *tree,
 197                       struct address_space *mapping,
 198                       get_extent_t *get_extent,
 199                       struct writeback_control *wbc);
 200 int extent_readpages(struct extent_io_tree *tree,
 201                      struct address_space *mapping,
 202                      struct list_head *pages, unsigned nr_pages,
 203                      get_extent_t get_extent);
 204 int extent_prepare_write(struct extent_io_tree *tree,
 205                          struct inode *inode, struct page *page,
 206                          unsigned from, unsigned to, get_extent_t *get_extent);
 207 int extent_commit_write(struct extent_io_tree *tree,
 208                         struct inode *inode, struct page *page,
 209                         unsigned from, unsigned to);
 210 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 211                 get_extent_t *get_extent);
 212 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 213                 __u64 start, __u64 len, get_extent_t *get_extent);
 214 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 215 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 216 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 217 void set_page_extent_mapped(struct page *page);
 218
 219 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 220                                           u64 start, unsigned long len,
 221                                           struct page *page0,
 222                                           gfp_t mask);
 223 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 224                                          u64 start, unsigned long len,
 225                                           gfp_t mask);
 226 void free_extent_buffer(struct extent_buffer *eb);
 227 int read_extent_buffer_pages(struct extent_io_tree *tree,
 228                              struct extent_buffer *eb, u64 start, int wait,
 229                              get_extent_t *get_extent, int mirror_num);
 230
 231 static inline void extent_buffer_get(struct extent_buffer *eb)
 232 {
 233         atomic_inc(&eb->refs);
 234 }
 235
 236 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 237                           unsigned long start,
 238                           unsigned long len);
 239 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 240                         unsigned long start,
 241                         unsigned long len);
 242 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 243                          unsigned long start, unsigned long len);
 244 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 245                         unsigned long dst_offset, unsigned long src_offset,
 246                         unsigned long len);
 247 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 248                            unsigned long src_offset, unsigned long len);
 249 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 250                            unsigned long src_offset, unsigned long len);
 251 void memset_extent_buffer(struct extent_buffer *eb, char c,
 252                           unsigned long start, unsigned long len);
 253 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
 254                                     struct extent_buffer *eb);
 255 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
 256 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 257 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 258                               struct extent_buffer *eb);
 259 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 260                              struct extent_buffer *eb);
 261 int test_extent_buffer_dirty(struct extent_io_tree *tree,
 262                              struct extent_buffer *eb);
 263 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 264                                struct extent_buffer *eb);
 265 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 266                                 struct extent_buffer *eb);
 267 int extent_buffer_uptodate(struct extent_io_tree *tree,
 268                            struct extent_buffer *eb);
 269 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 270                       unsigned long min_len, char **token, char **map,
 271                       unsigned long *map_start,
 272                       unsigned long *map_len, int km);
 273 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 274                       unsigned long min_len, char **token, char **map,
 275                       unsigned long *map_start,
 276                       unsigned long *map_len, int km);
 277 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 278 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
 279 int extent_range_uptodate(struct extent_io_tree *tree,
 280                           u64 start, u64 end);
 281 int extent_clear_unlock_delalloc(struct inode *inode,
 282                                 struct extent_io_tree *tree,
 283                                 u64 start, u64 end, struct page *locked_page,
 284                                 int unlock_page,
 285                                 int clear_unlock,
 286                                 int clear_delalloc, int clear_dirty,
 287                                 int set_writeback,
 288                                 int end_writeback);
 289 #endif