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_DO_ACCOUNTING (1 << 11)
  19 #define EXTENT_FIRST_DELALLOC (1 << 12)
  20 #define EXTENT_NEED_WAIT (1 << 13)
  21 #define EXTENT_DAMAGED (1 << 14)
  22 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  23 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
  24
  25 /*
  26  * flags for bio submission. The high bits indicate the compression
  27  * type for this bio
  28  */
  29 #define EXTENT_BIO_COMPRESSED 1
  30 #define EXTENT_BIO_FLAG_SHIFT 16
  31
  32 /* these are bit numbers for test/set bit */
  33 #define EXTENT_BUFFER_UPTODATE 0
  34 #define EXTENT_BUFFER_BLOCKING 1
  35 #define EXTENT_BUFFER_DIRTY 2
  36 #define EXTENT_BUFFER_CORRUPT 3
  37 #define EXTENT_BUFFER_READAHEAD 4       /* this got triggered by readahead */
  38
  39 /* these are flags for extent_clear_unlock_delalloc */
  40 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1
  41 #define EXTENT_CLEAR_UNLOCK      0x2
  42 #define EXTENT_CLEAR_DELALLOC    0x4
  43 #define EXTENT_CLEAR_DIRTY       0x8
  44 #define EXTENT_SET_WRITEBACK     0x10
  45 #define EXTENT_END_WRITEBACK     0x20
  46 #define EXTENT_SET_PRIVATE2      0x40
  47 #define EXTENT_CLEAR_ACCOUNTING  0x80
  48
  49 /*
  50  * page->private values.  Every page that is controlled by the extent
  51  * map has page->private set to one.
  52  */
  53 #define EXTENT_PAGE_PRIVATE 1
  54 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
  55
  56 struct extent_state;
  57
  58 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
  59                                        struct bio *bio, int mirror_num,
  60                                        unsigned long bio_flags, u64 bio_offset);
  61 struct extent_io_ops {
  62         int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
  63                              u64 start, u64 end, int *page_started,
  64                              unsigned long *nr_written);
  65         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
  66         int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
  67         extent_submit_bio_hook_t *submit_bio_hook;
  68         int (*merge_bio_hook)(struct page *page, unsigned long offset,
  69                               size_t size, struct bio *bio,
  70                               unsigned long bio_flags);
  71         int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
  72         int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
  73                                        u64 start, u64 end, u64 failed_mirror,
  74                                        struct extent_state *state);
  75         int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
  76                                         u64 start, u64 end,
  77                                        struct extent_state *state);
  78         int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
  79                                     struct extent_state *state);
  80         int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
  81                                       struct extent_state *state, int uptodate);
  82         void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
  83                              int *bits);
  84         void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
  85                                int *bits);
  86         void (*merge_extent_hook)(struct inode *inode,
  87                                   struct extent_state *new,
  88                                   struct extent_state *other);
  89         void (*split_extent_hook)(struct inode *inode,
  90                                   struct extent_state *orig, u64 split);
  91         int (*write_cache_pages_lock_hook)(struct page *page, void *data,
  92                                            void (*flush_fn)(void *));
  93 };
  94
  95 struct extent_io_tree {
  96         struct rb_root state;
  97         struct radix_tree_root buffer;
  98         struct address_space *mapping;
  99         u64 dirty_bytes;
 100         spinlock_t lock;
 101         spinlock_t buffer_lock;
 102         struct extent_io_ops *ops;
 103 };
 104
 105 struct extent_state {
 106         u64 start;
 107         u64 end; /* inclusive */
 108         struct rb_node rb_node;
 109
 110         /* ADD NEW ELEMENTS AFTER THIS */
 111         struct extent_io_tree *tree;
 112         wait_queue_head_t wq;
 113         atomic_t refs;
 114         unsigned long state;
 115
 116         /* for use by the FS */
 117         u64 private;
 118
 119         struct list_head leak_list;
 120 };
 121
 122 struct extent_buffer {
 123         u64 start;
 124         unsigned long len;
 125         unsigned long map_start;
 126         unsigned long map_len;
 127         struct page *first_page;
 128         unsigned long bflags;
 129         struct list_head leak_list;
 130         struct rcu_head rcu_head;
 131         atomic_t refs;
 132
 133         /* count of read lock holders on the extent buffer */
 134         atomic_t write_locks;
 135         atomic_t read_locks;
 136         atomic_t blocking_writers;
 137         atomic_t blocking_readers;
 138         atomic_t spinning_readers;
 139         atomic_t spinning_writers;
 140
 141         /* protects write locks */
 142         rwlock_t lock;
 143
 144         /* readers use lock_wq while they wait for the write
 145          * lock holders to unlock
 146          */
 147         wait_queue_head_t write_lock_wq;
 148
 149         /* writers use read_lock_wq while they wait for readers
 150          * to unlock
 151          */
 152         wait_queue_head_t read_lock_wq;
 153 };
 154
 155 static inline void extent_set_compress_type(unsigned long *bio_flags,
 156                                             int compress_type)
 157 {
 158         *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
 159 }
 160
 161 static inline int extent_compress_type(unsigned long bio_flags)
 162 {
 163         return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
 164 }
 165
 166 struct extent_map_tree;
 167
 168 typedef struct extent_map *(get_extent_t)(struct inode *inode,
 169                                           struct page *page,
 170                                           size_t pg_offset,
 171                                           u64 start, u64 len,
 172                                           int create);
 173
 174 void extent_io_tree_init(struct extent_io_tree *tree,
 175                          struct address_space *mapping);
 176 int try_release_extent_mapping(struct extent_map_tree *map,
 177                                struct extent_io_tree *tree, struct page *page,
 178                                gfp_t mask);
 179 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
 180 int try_release_extent_state(struct extent_map_tree *map,
 181                              struct extent_io_tree *tree, struct page *page,
 182                              gfp_t mask);
 183 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 184 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 185                      int bits, struct extent_state **cached, gfp_t mask);
 186 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
 187 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
 188                          struct extent_state **cached, gfp_t mask);
 189 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
 190                     gfp_t mask);
 191 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
 192                           get_extent_t *get_extent, int mirror_num);
 193 int __init extent_io_init(void);
 194 void extent_io_exit(void);
 195
 196 u64 count_range_bits(struct extent_io_tree *tree,
 197                      u64 *start, u64 search_end,
 198                      u64 max_bytes, unsigned long bits, int contig);
 199
 200 void free_extent_state(struct extent_state *state);
 201 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 202                    int bits, int filled, struct extent_state *cached_state);
 203 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 204                       int bits, gfp_t mask);
 205 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 206                      int bits, int wake, int delete, struct extent_state **cached,
 207                      gfp_t mask);
 208 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 209                     int bits, gfp_t mask);
 210 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 211                    int bits, int exclusive_bits, u64 *failed_start,
 212                    struct extent_state **cached_state, gfp_t mask);
 213 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
 214                         struct extent_state **cached_state, gfp_t mask);
 215 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
 216                    gfp_t mask);
 217 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 218                      gfp_t mask);
 219 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
 220                        gfp_t mask);
 221 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 222                        int bits, int clear_bits, gfp_t mask);
 223 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
 224                         struct extent_state **cached_state, gfp_t mask);
 225 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 226                           u64 *start_ret, u64 *end_ret, int bits);
 227 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
 228                                                  u64 start, int bits);
 229 int extent_invalidatepage(struct extent_io_tree *tree,
 230                           struct page *page, unsigned long offset);
 231 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 232                           get_extent_t *get_extent,
 233                           struct writeback_control *wbc);
 234 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
 235                               u64 start, u64 end, get_extent_t *get_extent,
 236                               int mode);
 237 int extent_writepages(struct extent_io_tree *tree,
 238                       struct address_space *mapping,
 239                       get_extent_t *get_extent,
 240                       struct writeback_control *wbc);
 241 int extent_readpages(struct extent_io_tree *tree,
 242                      struct address_space *mapping,
 243                      struct list_head *pages, unsigned nr_pages,
 244                      get_extent_t get_extent);
 245 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 246                 __u64 start, __u64 len, get_extent_t *get_extent);
 247 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
 248 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
 249 void set_page_extent_mapped(struct page *page);
 250
 251 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 252                                           u64 start, unsigned long len,
 253                                           struct page *page0);
 254 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 255                                          u64 start, unsigned long len);
 256 void free_extent_buffer(struct extent_buffer *eb);
 257 #define WAIT_NONE       0
 258 #define WAIT_COMPLETE   1
 259 #define WAIT_PAGE_LOCK  2
 260 int read_extent_buffer_pages(struct extent_io_tree *tree,
 261                              struct extent_buffer *eb, u64 start, int wait,
 262                              get_extent_t *get_extent, int mirror_num);
 263 unsigned long num_extent_pages(u64 start, u64 len);
 264 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i);
 265
 266 static inline void extent_buffer_get(struct extent_buffer *eb)
 267 {
 268         atomic_inc(&eb->refs);
 269 }
 270
 271 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 272                           unsigned long start,
 273                           unsigned long len);
 274 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 275                         unsigned long start,
 276                         unsigned long len);
 277 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 278                          unsigned long start, unsigned long len);
 279 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 280                         unsigned long dst_offset, unsigned long src_offset,
 281                         unsigned long len);
 282 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 283                            unsigned long src_offset, unsigned long len);
 284 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 285                            unsigned long src_offset, unsigned long len);
 286 void memset_extent_buffer(struct extent_buffer *eb, char c,
 287                           unsigned long start, unsigned long len);
 288 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 289 int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 290                               struct extent_buffer *eb);
 291 int set_extent_buffer_dirty(struct extent_io_tree *tree,
 292                              struct extent_buffer *eb);
 293 int set_extent_buffer_uptodate(struct extent_io_tree *tree,
 294                                struct extent_buffer *eb);
 295 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 296                                 struct extent_buffer *eb,
 297                                 struct extent_state **cached_state);
 298 int extent_buffer_uptodate(struct extent_io_tree *tree,
 299                            struct extent_buffer *eb,
 300                            struct extent_state *cached_state);
 301 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
 302                       unsigned long min_len, char **map,
 303                       unsigned long *map_start,
 304                       unsigned long *map_len);
 305 int extent_range_uptodate(struct extent_io_tree *tree,
 306                           u64 start, u64 end);
 307 int extent_clear_unlock_delalloc(struct inode *inode,
 308                                 struct extent_io_tree *tree,
 309                                 u64 start, u64 end, struct page *locked_page,
 310                                 unsigned long op);
 311 struct bio *
 312 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
 313                 gfp_t gfp_flags);
 314
 315 struct btrfs_mapping_tree;
 316
 317 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
 318                         u64 length, u64 logical, struct page *page,
 319                         int mirror_num);
 320 #endif