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