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_TREE_LOG 2 31 #define EXTENT_BIO_FLAG_SHIFT 16 32 33 /* these are bit numbers for test/set bit */ 34 #define EXTENT_BUFFER_UPTODATE 0 35 #define EXTENT_BUFFER_BLOCKING 1 36 #define EXTENT_BUFFER_DIRTY 2 37 #define EXTENT_BUFFER_CORRUPT 3 38 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */ 39 #define EXTENT_BUFFER_TREE_REF 5 40 #define EXTENT_BUFFER_STALE 6 41 #define EXTENT_BUFFER_WRITEBACK 7 42 #define EXTENT_BUFFER_IOERR 8 43 #define EXTENT_BUFFER_DUMMY 9 44 45 /* these are flags for extent_clear_unlock_delalloc */ 46 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1 47 #define EXTENT_CLEAR_UNLOCK 0x2 48 #define EXTENT_CLEAR_DELALLOC 0x4 49 #define EXTENT_CLEAR_DIRTY 0x8 50 #define EXTENT_SET_WRITEBACK 0x10 51 #define EXTENT_END_WRITEBACK 0x20 52 #define EXTENT_SET_PRIVATE2 0x40 53 #define EXTENT_CLEAR_ACCOUNTING 0x80 54 55 /* 56 * page->private values. Every page that is controlled by the extent 57 * map has page->private set to one. 58 */ 59 #define EXTENT_PAGE_PRIVATE 1 60 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 61 62 struct extent_state; 63 struct btrfs_root; 64 65 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 66 struct bio *bio, int mirror_num, 67 unsigned long bio_flags, u64 bio_offset); 68 struct extent_io_ops { 69 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 70 u64 start, u64 end, int *page_started, 71 unsigned long *nr_written); 72 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 73 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 74 extent_submit_bio_hook_t *submit_bio_hook; 75 int (*merge_bio_hook)(struct page *page, unsigned long offset, 76 size_t size, struct bio *bio, 77 unsigned long bio_flags); 78 int (*readpage_io_hook)(struct page *page, u64 start, u64 end); 79 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 80 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, 81 struct extent_state *state, int mirror); 82 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 83 struct extent_state *state, int uptodate); 84 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 85 int *bits); 86 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 87 int *bits); 88 void (*merge_extent_hook)(struct inode *inode, 89 struct extent_state *new, 90 struct extent_state *other); 91 void (*split_extent_hook)(struct inode *inode, 92 struct extent_state *orig, u64 split); 93 int (*write_cache_pages_lock_hook)(struct page *page, void *data, 94 void (*flush_fn)(void *)); 95 }; 96 97 struct extent_io_tree { 98 struct rb_root state; 99 struct radix_tree_root buffer; 100 struct address_space *mapping; 101 u64 dirty_bytes; 102 int track_uptodate; 103 spinlock_t lock; 104 spinlock_t buffer_lock; 105 struct extent_io_ops *ops; 106 }; 107 108 struct extent_state { 109 u64 start; 110 u64 end; /* inclusive */ 111 struct rb_node rb_node; 112 113 /* ADD NEW ELEMENTS AFTER THIS */ 114 struct extent_io_tree *tree; 115 wait_queue_head_t wq; 116 atomic_t refs; 117 unsigned long state; 118 119 /* for use by the FS */ 120 u64 private; 121 122 struct list_head leak_list; 123 }; 124 125 #define INLINE_EXTENT_BUFFER_PAGES 16 126 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE) 127 struct extent_buffer { 128 u64 start; 129 unsigned long len; 130 unsigned long map_start; 131 unsigned long map_len; 132 unsigned long bflags; 133 struct extent_io_tree *tree; 134 spinlock_t refs_lock; 135 atomic_t refs; 136 atomic_t io_pages; 137 int read_mirror; 138 struct list_head leak_list; 139 struct rcu_head rcu_head; 140 pid_t lock_owner; 141 142 /* count of read lock holders on the extent buffer */ 143 atomic_t write_locks; 144 atomic_t read_locks; 145 atomic_t blocking_writers; 146 atomic_t blocking_readers; 147 atomic_t spinning_readers; 148 atomic_t spinning_writers; 149 int lock_nested; 150 151 /* protects write locks */ 152 rwlock_t lock; 153 154 /* readers use lock_wq while they wait for the write 155 * lock holders to unlock 156 */ 157 wait_queue_head_t write_lock_wq; 158 159 /* writers use read_lock_wq while they wait for readers 160 * to unlock 161 */ 162 wait_queue_head_t read_lock_wq; 163 wait_queue_head_t lock_wq; 164 struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES]; 165 struct page **pages; 166 }; 167 168 static inline void extent_set_compress_type(unsigned long *bio_flags, 169 int compress_type) 170 { 171 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 172 } 173 174 static inline int extent_compress_type(unsigned long bio_flags) 175 { 176 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 177 } 178 179 struct extent_map_tree; 180 181 typedef struct extent_map *(get_extent_t)(struct inode *inode, 182 struct page *page, 183 size_t pg_offset, 184 u64 start, u64 len, 185 int create); 186 187 void extent_io_tree_init(struct extent_io_tree *tree, 188 struct address_space *mapping); 189 int try_release_extent_mapping(struct extent_map_tree *map, 190 struct extent_io_tree *tree, struct page *page, 191 gfp_t mask); 192 int try_release_extent_buffer(struct page *page, gfp_t mask); 193 int try_release_extent_state(struct extent_map_tree *map, 194 struct extent_io_tree *tree, struct page *page, 195 gfp_t mask); 196 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 197 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 198 int bits, struct extent_state **cached); 199 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 200 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 201 struct extent_state **cached, gfp_t mask); 202 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 203 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 204 get_extent_t *get_extent, int mirror_num); 205 int __init extent_io_init(void); 206 void extent_io_exit(void); 207 208 u64 count_range_bits(struct extent_io_tree *tree, 209 u64 *start, u64 search_end, 210 u64 max_bytes, unsigned long bits, int contig); 211 212 void free_extent_state(struct extent_state *state); 213 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 214 int bits, int filled, struct extent_state *cached_state); 215 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 216 int bits, gfp_t mask); 217 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 218 int bits, int wake, int delete, struct extent_state **cached, 219 gfp_t mask); 220 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 221 int bits, gfp_t mask); 222 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 223 int bits, u64 *failed_start, 224 struct extent_state **cached_state, gfp_t mask); 225 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 226 struct extent_state **cached_state, gfp_t mask); 227 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 228 struct extent_state **cached_state, gfp_t mask); 229 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 230 gfp_t mask); 231 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 232 gfp_t mask); 233 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 234 gfp_t mask); 235 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 236 int bits, int clear_bits, 237 struct extent_state **cached_state, gfp_t mask); 238 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 239 struct extent_state **cached_state, gfp_t mask); 240 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, 241 struct extent_state **cached_state, gfp_t mask); 242 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 243 u64 *start_ret, u64 *end_ret, int bits, 244 struct extent_state **cached_state); 245 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, 246 u64 start, int bits); 247 int extent_invalidatepage(struct extent_io_tree *tree, 248 struct page *page, unsigned long offset); 249 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 250 get_extent_t *get_extent, 251 struct writeback_control *wbc); 252 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 253 u64 start, u64 end, get_extent_t *get_extent, 254 int mode); 255 int extent_writepages(struct extent_io_tree *tree, 256 struct address_space *mapping, 257 get_extent_t *get_extent, 258 struct writeback_control *wbc); 259 int btree_write_cache_pages(struct address_space *mapping, 260 struct writeback_control *wbc); 261 int extent_readpages(struct extent_io_tree *tree, 262 struct address_space *mapping, 263 struct list_head *pages, unsigned nr_pages, 264 get_extent_t get_extent); 265 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 266 __u64 start, __u64 len, get_extent_t *get_extent); 267 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); 268 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 269 void set_page_extent_mapped(struct page *page); 270 271 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 272 u64 start, unsigned long len); 273 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len); 274 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 275 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, 276 u64 start, unsigned long len); 277 void free_extent_buffer(struct extent_buffer *eb); 278 void free_extent_buffer_stale(struct extent_buffer *eb); 279 #define WAIT_NONE 0 280 #define WAIT_COMPLETE 1 281 #define WAIT_PAGE_LOCK 2 282 int read_extent_buffer_pages(struct extent_io_tree *tree, 283 struct extent_buffer *eb, u64 start, int wait, 284 get_extent_t *get_extent, int mirror_num); 285 286 static inline unsigned long num_extent_pages(u64 start, u64 len) 287 { 288 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 289 (start >> PAGE_CACHE_SHIFT); 290 } 291 292 static inline struct page *extent_buffer_page(struct extent_buffer *eb, 293 unsigned long i) 294 { 295 return eb->pages[i]; 296 } 297 298 static inline void extent_buffer_get(struct extent_buffer *eb) 299 { 300 atomic_inc(&eb->refs); 301 } 302 303 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 304 unsigned long start, 305 unsigned long len); 306 void read_extent_buffer(struct extent_buffer *eb, void *dst, 307 unsigned long start, 308 unsigned long len); 309 void write_extent_buffer(struct extent_buffer *eb, const void *src, 310 unsigned long start, unsigned long len); 311 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 312 unsigned long dst_offset, unsigned long src_offset, 313 unsigned long len); 314 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 315 unsigned long src_offset, unsigned long len); 316 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 317 unsigned long src_offset, unsigned long len); 318 void memset_extent_buffer(struct extent_buffer *eb, char c, 319 unsigned long start, unsigned long len); 320 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits); 321 void clear_extent_buffer_dirty(struct extent_buffer *eb); 322 int set_extent_buffer_dirty(struct extent_buffer *eb); 323 int set_extent_buffer_uptodate(struct extent_buffer *eb); 324 int clear_extent_buffer_uptodate(struct extent_buffer *eb); 325 int extent_buffer_uptodate(struct extent_buffer *eb); 326 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 327 unsigned long min_len, char **map, 328 unsigned long *map_start, 329 unsigned long *map_len); 330 int extent_range_uptodate(struct extent_io_tree *tree, 331 u64 start, u64 end); 332 int extent_clear_unlock_delalloc(struct inode *inode, 333 struct extent_io_tree *tree, 334 u64 start, u64 end, struct page *locked_page, 335 unsigned long op); 336 struct bio * 337 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 338 gfp_t gfp_flags); 339 340 struct btrfs_fs_info; 341 342 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start, 343 u64 length, u64 logical, struct page *page, 344 int mirror_num); 345 int end_extent_writepage(struct page *page, int err, u64 start, u64 end); 346 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, 347 int mirror_num); 348 #endif 349