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