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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  19
  20 /* flags for bio submission */
  21 #define EXTENT_BIO_COMPRESSED 1
  22
  23 /* these are bit numbers for test/set bit */
  24 #define EXTENT_BUFFER_UPTODATE 0
  25 #define EXTENT_BUFFER_BLOCKING 1
  26 #define EXTENT_BUFFER_DIRTY 2
  27
  28 /*
  29  * page->private values.  Every page that is controlled by the extent
  30  * map has page->private set to one.
  31  */
  32 #define EXTENT_PAGE_PRIVATE 1
  33 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  34
  35 struct extent_state;
  36
  37 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  38                                        struct bio *bio, int mirror_num,
  39                                        unsigned long bio_flags);
  40 struct extent_io_ops {
  41         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  42                              u64 start, u64 end, int *page_started,
  43                              unsigned long *nr_written);
  44         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  45         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  46         extent_submit_bio_hook_t *submit_bio_hook;
  47         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  48                               size_t size, struct bio *bio,
  49                               unsigned long bio_flags);
  50         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  51         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  52                                        u64 start, u64 end,
  53                                        struct extent_state *state);
  54         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  55                                         u64 start, u64 end,
  56                                        struct extent_state *state);
  57         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  58                                     struct extent_state *state);
  59         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  60                                       struct extent_state *state, int uptodate);
  61         int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
  62                             unsigned long old, unsigned long bits);
  63         int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
  64                             unsigned long old, unsigned long bits);
  65         int (*write_cache_pages_lock_hook)(struct page *page);
  66 };
  67
  68 struct extent_io_tree {
  69         struct rb_root state;
  70         struct rb_root buffer;
  71         struct address_space *mapping;
  72         u64 dirty_bytes;
  73         spinlock_t lock;
  74         spinlock_t buffer_lock;
  75         struct extent_io_ops *ops;
  76 };
  77
  78 struct extent_state {
  79         u64 start;
  80         u64 end; /* inclusive */
  81         struct rb_node rb_node;
  82         struct extent_io_tree *tree;
  83         wait_queue_head_t wq;
  84         atomic_t refs;
  85         unsigned long state;
  86
  87         /* for use by the FS */
  88         u64 private;
  89
  90         struct list_head leak_list;
  91 };
  92
  93 struct extent_buffer {
  94         u64 start;
  95         unsigned long len;
  96         char *map_token;
  97         char *kaddr;
  98         unsigned long map_start;
  99         unsigned long map_len;
 100         struct page *first_page;
 101         unsigned long bflags;
 102         atomic_t refs;
 103         struct list_head leak_list;
 104         struct rb_node rb_node;
 105
 106         /* the spinlock is used to protect most operations */
 107         spinlock_t lock;
 108
 109         /*
 110          * when we keep the lock held while blocking, waiters go onto
 111          * the wq
 112          */
 113         wait_queue_head_t lock_wq;
 114 };
 115
 116 struct extent_map_tree;
 117
 118 static inline struct extent_state *extent_state_next(struct extent_state *state)
 119 {
 120         struct rb_node *node;
 121         node = rb_next(&state->rb_node);
 122         if (!node)
 123                 return NULL;
 124         return rb_entry(node, struct extent_state, rb_node);
 125 }
 126
 127 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 128                                           struct page *page,
 129                                           size_t page_offset,
 130                                           u64 start, u64 len,
 131                                           int create);
 132
 133 void extent_io_tree_init(struct extent_io_tree *tree,
 134                           struct address_space *mapping, gfp_t mask);
 135 int try_release_extent_mapping(struct extent_map_tree *map,
 136                                struct extent_io_tree *tree, struct page *page,
 137                                gfp_t mask);
 138 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 139 int try_release_extent_state(struct extent_map_tree *map,
 140                              struct extent_io_tree *tree, struct page *page,
 141                              gfp_t mask);
 142 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 143 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 144                      int bits, struct extent_state **cached, gfp_t mask);
 145 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 146 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 147                     gfp_t mask);
 148 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 149                           get_extent_t *get_extent);
 150 int __init extent_io_init(void);
 151 void extent_io_exit(void);
 152
 153 u64 count_range_bits(struct extent_io_tree *tree,
 154                      u64 *start, u64 search_end,
 155                      u64 max_bytes, unsigned long bits);
 156
 157 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 158                    int bits, int filled, struct extent_state *cached_state);
 159 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 160                       int bits, gfp_t mask);
 161 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 162                      int bits, int wake, int delete, struct extent_state **cached,
 163                      gfp_t mask);
 164 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 165                     int bits, gfp_t mask);
 166 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 167                         gfp_t mask);
 168 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 169                    gfp_t mask);
 170 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 171                      gfp_t mask);
 172 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 173                        gfp_t mask);
 174 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 175                        gfp_t mask);
 176 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
 177                                   u64 end, gfp_t mask);
 178 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 179                      gfp_t mask);
 180 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
 181                      gfp_t mask);
 182 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 183                           u64 *start_ret, u64 *end_ret, int bits);
 184 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 185                                                  u64 start, int bits);
 186 int extent_invalidatepage(struct extent_io_tree *tree,
 187                           struct page *page, unsigned long offset);
 188 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 189                           get_extent_t *get_extent,
 190                           struct writeback_control *wbc);
 191 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 192                               u64 start, u64 end, get_extent_t *get_extent,
 193                               int mode);
 194 int extent_writepages(struct extent_io_tree *tree,
 195                       struct address_space *mapping,
 196                       get_extent_t *get_extent,
 197                       struct writeback_control *wbc);
 198 int extent_readpages(struct extent_io_tree *tree,
 199                      struct address_space *mapping,
 200                      struct list_head *pages, unsigned nr_pages,
 201                      get_extent_t get_extent);
 202 int extent_prepare_write(struct extent_io_tree *tree,
 203                          struct inode *inode, struct page *page,
 204                          unsigned from, unsigned to, get_extent_t *get_extent);
 205 int extent_commit_write(struct extent_io_tree *tree,
 206                         struct inode *inode, struct page *page,
 207                         unsigned from, unsigned to);
 208 sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 209                 get_extent_t *get_extent);
 210 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 211                 __u64 start, __u64 len, get_extent_t *get_extent);
 212 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
 213 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 214 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 215 void set_page_extent_mapped(struct page *page);
 216
 217 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 218                                           u64 start, unsigned long len,
 219                                           struct page *page0,
 220                                           gfp_t mask);
 221 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 222                                          u64 start, unsigned long len,
 223                                           gfp_t mask);
 224 void free_extent_buffer(struct extent_buffer *eb);
 225 int read_extent_buffer_pages(struct extent_io_tree *tree,
 226                              struct extent_buffer *eb, u64 start, int wait,
 227                              get_extent_t *get_extent, int mirror_num);
 228
 229 static inline void extent_buffer_get(struct extent_buffer *eb)
 230 {
 231         atomic_inc(&eb->refs);
 232 }
 233
 234 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 235                           unsigned long start,
 236                           unsigned long len);
 237 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 238                         unsigned long start,
 239                         unsigned long len);
 240 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 241                          unsigned long start, unsigned long len);
 242 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 243                         unsigned long dst_offset, unsigned long src_offset,
 244                         unsigned long len);
 245 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 246                            unsigned long src_offset, unsigned long len);
 247 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 248                            unsigned long src_offset, unsigned long len);
 249 void memset_extent_buffer(struct extent_buffer *eb, char c,
 250                           unsigned long start, unsigned long len);
 251 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
 252                                     struct extent_buffer *eb);
 253 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
 254 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 255 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 256                               struct extent_buffer *eb);
 257 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 258                              struct extent_buffer *eb);
 259 int test_extent_buffer_dirty(struct extent_io_tree *tree,
 260                              struct extent_buffer *eb);
 261 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 262                                struct extent_buffer *eb);
 263 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 264                                 struct extent_buffer *eb);
 265 int extent_buffer_uptodate(struct extent_io_tree *tree,
 266                            struct extent_buffer *eb);
 267 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 268                       unsigned long min_len, char **token, char **map,
 269                       unsigned long *map_start,
 270                       unsigned long *map_len, int km);
 271 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 272                       unsigned long min_len, char **token, char **map,
 273                       unsigned long *map_start,
 274                       unsigned long *map_len, int km);
 275 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 276 int release_extent_buffer_tail_pages(struct extent_buffer *eb);
 277 int extent_range_uptodate(struct extent_io_tree *tree,
 278                           u64 start, u64 end);
 279 int extent_clear_unlock_delalloc(struct inode *inode,
 280                                 struct extent_io_tree *tree,
 281                                 u64 start, u64 end, struct page *locked_page,
 282                                 int unlock_page,
 283                                 int clear_unlock,
 284                                 int clear_delalloc, int clear_dirty,
 285                                 int set_writeback,
 286                                 int end_writeback,
 287                                 int set_private2);
 288 #endif