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