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_NORESERVE (1 << 15) 23 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) 24 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) 25 26 /* 27 * flags for bio submission. The high bits indicate the compression 28 * type for this bio 29 */ 30 #define EXTENT_BIO_COMPRESSED 1 31 #define EXTENT_BIO_TREE_LOG 2 32 #define EXTENT_BIO_PARENT_LOCKED 4 33 #define EXTENT_BIO_FLAG_SHIFT 16 34 35 /* these are bit numbers for test/set bit */ 36 #define EXTENT_BUFFER_UPTODATE 0 37 #define EXTENT_BUFFER_BLOCKING 1 38 #define EXTENT_BUFFER_DIRTY 2 39 #define EXTENT_BUFFER_CORRUPT 3 40 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */ 41 #define EXTENT_BUFFER_TREE_REF 5 42 #define EXTENT_BUFFER_STALE 6 43 #define EXTENT_BUFFER_WRITEBACK 7 44 #define EXTENT_BUFFER_IOERR 8 45 #define EXTENT_BUFFER_DUMMY 9 46 #define EXTENT_BUFFER_IN_TREE 10 47 48 /* these are flags for extent_clear_unlock_delalloc */ 49 #define PAGE_UNLOCK (1 << 0) 50 #define PAGE_CLEAR_DIRTY (1 << 1) 51 #define PAGE_SET_WRITEBACK (1 << 2) 52 #define PAGE_END_WRITEBACK (1 << 3) 53 #define PAGE_SET_PRIVATE2 (1 << 4) 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 struct btrfs_io_bio; 65 66 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 67 struct bio *bio, int mirror_num, 68 unsigned long bio_flags, u64 bio_offset); 69 struct extent_io_ops { 70 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 71 u64 start, u64 end, int *page_started, 72 unsigned long *nr_written); 73 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 74 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 75 extent_submit_bio_hook_t *submit_bio_hook; 76 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset, 77 size_t size, struct bio *bio, 78 unsigned long bio_flags); 79 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 80 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset, 81 struct page *page, u64 start, u64 end, 82 int mirror); 83 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 84 struct extent_state *state, int uptodate); 85 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 86 unsigned long *bits); 87 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 88 unsigned long *bits); 89 void (*merge_extent_hook)(struct inode *inode, 90 struct extent_state *new, 91 struct extent_state *other); 92 void (*split_extent_hook)(struct inode *inode, 93 struct extent_state *orig, u64 split); 94 }; 95 96 struct extent_io_tree { 97 struct rb_root state; 98 struct address_space *mapping; 99 u64 dirty_bytes; 100 int track_uptodate; 101 spinlock_t 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 #ifdef CONFIG_BTRFS_DEBUG 120 struct list_head leak_list; 121 #endif 122 }; 123 124 #define INLINE_EXTENT_BUFFER_PAGES 16 125 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE) 126 struct extent_buffer { 127 u64 start; 128 unsigned long len; 129 unsigned long map_start; 130 unsigned long map_len; 131 unsigned long bflags; 132 struct btrfs_fs_info *fs_info; 133 spinlock_t refs_lock; 134 atomic_t refs; 135 atomic_t io_pages; 136 int read_mirror; 137 struct rcu_head rcu_head; 138 pid_t lock_owner; 139 140 /* count of read lock holders on the extent buffer */ 141 atomic_t write_locks; 142 atomic_t read_locks; 143 atomic_t blocking_writers; 144 atomic_t blocking_readers; 145 atomic_t spinning_readers; 146 atomic_t spinning_writers; 147 int lock_nested; 148 149 /* protects write locks */ 150 rwlock_t lock; 151 152 /* readers use lock_wq while they wait for the write 153 * lock holders to unlock 154 */ 155 wait_queue_head_t write_lock_wq; 156 157 /* writers use read_lock_wq while they wait for readers 158 * to unlock 159 */ 160 wait_queue_head_t read_lock_wq; 161 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 162 #ifdef CONFIG_BTRFS_DEBUG 163 struct list_head leak_list; 164 #endif 165 }; 166 167 static inline void extent_set_compress_type(unsigned long *bio_flags, 168 int compress_type) 169 { 170 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 171 } 172 173 static inline int extent_compress_type(unsigned long bio_flags) 174 { 175 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 176 } 177 178 struct extent_map_tree; 179 180 typedef struct extent_map *(get_extent_t)(struct inode *inode, 181 struct page *page, 182 size_t pg_offset, 183 u64 start, u64 len, 184 int create); 185 186 void extent_io_tree_init(struct extent_io_tree *tree, 187 struct address_space *mapping); 188 int try_release_extent_mapping(struct extent_map_tree *map, 189 struct extent_io_tree *tree, struct page *page, 190 gfp_t mask); 191 int try_release_extent_buffer(struct page *page); 192 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 193 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 194 unsigned long bits, struct extent_state **cached); 195 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 196 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 197 struct extent_state **cached, gfp_t mask); 198 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 199 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 200 get_extent_t *get_extent, int mirror_num); 201 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, 202 get_extent_t *get_extent, int mirror_num); 203 int __init extent_io_init(void); 204 void extent_io_exit(void); 205 206 u64 count_range_bits(struct extent_io_tree *tree, 207 u64 *start, u64 search_end, 208 u64 max_bytes, unsigned long bits, int contig); 209 210 void free_extent_state(struct extent_state *state); 211 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 212 unsigned long bits, int filled, 213 struct extent_state *cached_state); 214 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 215 unsigned long bits, gfp_t mask); 216 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 217 unsigned long bits, int wake, int delete, 218 struct extent_state **cached, gfp_t mask); 219 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 220 unsigned long bits, gfp_t mask); 221 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 222 unsigned long bits, u64 *failed_start, 223 struct extent_state **cached_state, gfp_t mask); 224 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 225 struct extent_state **cached_state, gfp_t mask); 226 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 227 struct extent_state **cached_state, gfp_t mask); 228 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 229 gfp_t mask); 230 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 231 gfp_t mask); 232 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 233 gfp_t mask); 234 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 235 unsigned long bits, unsigned long clear_bits, 236 struct extent_state **cached_state, gfp_t mask); 237 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 238 struct extent_state **cached_state, gfp_t mask); 239 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, 240 struct extent_state **cached_state, gfp_t mask); 241 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 242 u64 *start_ret, u64 *end_ret, unsigned long bits, 243 struct extent_state **cached_state); 244 int extent_invalidatepage(struct extent_io_tree *tree, 245 struct page *page, unsigned long offset); 246 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 247 get_extent_t *get_extent, 248 struct writeback_control *wbc); 249 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 250 u64 start, u64 end, get_extent_t *get_extent, 251 int mode); 252 int extent_writepages(struct extent_io_tree *tree, 253 struct address_space *mapping, 254 get_extent_t *get_extent, 255 struct writeback_control *wbc); 256 int btree_write_cache_pages(struct address_space *mapping, 257 struct writeback_control *wbc); 258 int extent_readpages(struct extent_io_tree *tree, 259 struct address_space *mapping, 260 struct list_head *pages, unsigned nr_pages, 261 get_extent_t get_extent); 262 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 263 __u64 start, __u64 len, get_extent_t *get_extent); 264 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 265 void set_page_extent_mapped(struct page *page); 266 267 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, 268 u64 start, unsigned long len); 269 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len); 270 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 271 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, 272 u64 start); 273 void free_extent_buffer(struct extent_buffer *eb); 274 void free_extent_buffer_stale(struct extent_buffer *eb); 275 #define WAIT_NONE 0 276 #define WAIT_COMPLETE 1 277 #define WAIT_PAGE_LOCK 2 278 int read_extent_buffer_pages(struct extent_io_tree *tree, 279 struct extent_buffer *eb, u64 start, int wait, 280 get_extent_t *get_extent, int mirror_num); 281 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 282 283 static inline unsigned long num_extent_pages(u64 start, u64 len) 284 { 285 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 286 (start >> PAGE_CACHE_SHIFT); 287 } 288 289 static inline struct page *extent_buffer_page(struct extent_buffer *eb, 290 unsigned long i) 291 { 292 return eb->pages[i]; 293 } 294 295 static inline void extent_buffer_get(struct extent_buffer *eb) 296 { 297 atomic_inc(&eb->refs); 298 } 299 300 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 301 unsigned long start, 302 unsigned long len); 303 void read_extent_buffer(struct extent_buffer *eb, void *dst, 304 unsigned long start, 305 unsigned long len); 306 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *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 clear_extent_buffer_dirty(struct extent_buffer *eb); 321 int set_extent_buffer_dirty(struct extent_buffer *eb); 322 int set_extent_buffer_uptodate(struct extent_buffer *eb); 323 int clear_extent_buffer_uptodate(struct extent_buffer *eb); 324 int extent_buffer_uptodate(struct extent_buffer *eb); 325 int extent_buffer_under_io(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_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 331 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 332 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 333 struct page *locked_page, 334 unsigned long bits_to_clear, 335 unsigned long page_ops); 336 struct bio * 337 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 338 gfp_t gfp_flags); 339 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); 340 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); 341 342 struct btrfs_fs_info; 343 344 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start, 345 u64 length, u64 logical, struct page *page, 346 int mirror_num); 347 int end_extent_writepage(struct page *page, int err, u64 start, u64 end); 348 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, 349 int mirror_num); 350 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 351 noinline u64 find_lock_delalloc_range(struct inode *inode, 352 struct extent_io_tree *tree, 353 struct page *locked_page, u64 *start, 354 u64 *end, u64 max_bytes); 355 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, 356 u64 start, unsigned long len); 357 #endif 358 #endif 359