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 47 /* these are flags for extent_clear_unlock_delalloc */ 48 #define PAGE_UNLOCK (1 << 0) 49 #define PAGE_CLEAR_DIRTY (1 << 1) 50 #define PAGE_SET_WRITEBACK (1 << 2) 51 #define PAGE_END_WRITEBACK (1 << 3) 52 #define PAGE_SET_PRIVATE2 (1 << 4) 53 54 /* 55 * page->private values. Every page that is controlled by the extent 56 * map has page->private set to one. 57 */ 58 #define EXTENT_PAGE_PRIVATE 1 59 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 60 61 struct extent_state; 62 struct btrfs_root; 63 struct btrfs_io_bio; 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)(int rw, struct page *page, unsigned long offset, 76 size_t size, struct bio *bio, 77 unsigned long bio_flags); 78 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 79 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset, 80 struct page *page, u64 start, u64 end, 81 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 unsigned long *bits); 86 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 87 unsigned long *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 }; 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 int track_uptodate; 101 spinlock_t lock; 102 spinlock_t buffer_lock; 103 struct extent_io_ops *ops; 104 }; 105 106 struct extent_state { 107 u64 start; 108 u64 end; /* inclusive */ 109 struct rb_node rb_node; 110 111 /* ADD NEW ELEMENTS AFTER THIS */ 112 struct extent_io_tree *tree; 113 wait_queue_head_t wq; 114 atomic_t refs; 115 unsigned long state; 116 117 /* for use by the FS */ 118 u64 private; 119 120 #ifdef CONFIG_BTRFS_DEBUG 121 struct list_head leak_list; 122 #endif 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 rcu_head rcu_head; 139 pid_t lock_owner; 140 141 /* count of read lock holders on the extent buffer */ 142 atomic_t write_locks; 143 atomic_t read_locks; 144 atomic_t blocking_writers; 145 atomic_t blocking_readers; 146 atomic_t spinning_readers; 147 atomic_t spinning_writers; 148 int lock_nested; 149 150 /* protects write locks */ 151 rwlock_t lock; 152 153 /* readers use lock_wq while they wait for the write 154 * lock holders to unlock 155 */ 156 wait_queue_head_t write_lock_wq; 157 158 /* writers use read_lock_wq while they wait for readers 159 * to unlock 160 */ 161 wait_queue_head_t read_lock_wq; 162 wait_queue_head_t lock_wq; 163 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 164 #ifdef CONFIG_BTRFS_DEBUG 165 struct list_head leak_list; 166 #endif 167 }; 168 169 static inline void extent_set_compress_type(unsigned long *bio_flags, 170 int compress_type) 171 { 172 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 173 } 174 175 static inline int extent_compress_type(unsigned long bio_flags) 176 { 177 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 178 } 179 180 struct extent_map_tree; 181 182 typedef struct extent_map *(get_extent_t)(struct inode *inode, 183 struct page *page, 184 size_t pg_offset, 185 u64 start, u64 len, 186 int create); 187 188 void extent_io_tree_init(struct extent_io_tree *tree, 189 struct address_space *mapping); 190 int try_release_extent_mapping(struct extent_map_tree *map, 191 struct extent_io_tree *tree, struct page *page, 192 gfp_t mask); 193 int try_release_extent_buffer(struct page *page); 194 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 195 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 196 unsigned long bits, struct extent_state **cached); 197 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 198 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 199 struct extent_state **cached, gfp_t mask); 200 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 201 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 202 get_extent_t *get_extent, int mirror_num); 203 int extent_read_full_page_nolock(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 unsigned long bits, int filled, 215 struct extent_state *cached_state); 216 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 217 unsigned long bits, gfp_t mask); 218 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 219 unsigned long bits, int wake, int delete, 220 struct extent_state **cached, gfp_t mask); 221 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 222 unsigned long bits, gfp_t mask); 223 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 224 unsigned long bits, u64 *failed_start, 225 struct extent_state **cached_state, gfp_t mask); 226 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 227 struct extent_state **cached_state, gfp_t mask); 228 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 229 struct extent_state **cached_state, gfp_t mask); 230 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 231 gfp_t mask); 232 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 233 gfp_t mask); 234 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 235 gfp_t mask); 236 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 237 unsigned long bits, unsigned long clear_bits, 238 struct extent_state **cached_state, gfp_t mask); 239 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 240 struct extent_state **cached_state, gfp_t mask); 241 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, 242 struct extent_state **cached_state, gfp_t mask); 243 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 244 u64 *start_ret, u64 *end_ret, unsigned long bits, 245 struct extent_state **cached_state); 246 int extent_invalidatepage(struct extent_io_tree *tree, 247 struct page *page, unsigned long offset); 248 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 249 get_extent_t *get_extent, 250 struct writeback_control *wbc); 251 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 252 u64 start, u64 end, get_extent_t *get_extent, 253 int mode); 254 int extent_writepages(struct extent_io_tree *tree, 255 struct address_space *mapping, 256 get_extent_t *get_extent, 257 struct writeback_control *wbc); 258 int btree_write_cache_pages(struct address_space *mapping, 259 struct writeback_control *wbc); 260 int extent_readpages(struct extent_io_tree *tree, 261 struct address_space *mapping, 262 struct list_head *pages, unsigned nr_pages, 263 get_extent_t get_extent); 264 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 265 __u64 start, __u64 len, get_extent_t *get_extent); 266 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 267 void set_page_extent_mapped(struct page *page); 268 269 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 270 u64 start, unsigned long len); 271 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len); 272 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 273 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, 274 u64 start, unsigned long len); 275 void free_extent_buffer(struct extent_buffer *eb); 276 void free_extent_buffer_stale(struct extent_buffer *eb); 277 #define WAIT_NONE 0 278 #define WAIT_COMPLETE 1 279 #define WAIT_PAGE_LOCK 2 280 int read_extent_buffer_pages(struct extent_io_tree *tree, 281 struct extent_buffer *eb, u64 start, int wait, 282 get_extent_t *get_extent, int mirror_num); 283 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 284 285 static inline unsigned long num_extent_pages(u64 start, u64 len) 286 { 287 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 288 (start >> PAGE_CACHE_SHIFT); 289 } 290 291 static inline struct page *extent_buffer_page(struct extent_buffer *eb, 292 unsigned long i) 293 { 294 return eb->pages[i]; 295 } 296 297 static inline void extent_buffer_get(struct extent_buffer *eb) 298 { 299 atomic_inc(&eb->refs); 300 } 301 302 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 303 unsigned long start, 304 unsigned long len); 305 void read_extent_buffer(struct extent_buffer *eb, void *dst, 306 unsigned long start, 307 unsigned long len); 308 void write_extent_buffer(struct extent_buffer *eb, const void *src, 309 unsigned long start, unsigned long len); 310 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 311 unsigned long dst_offset, unsigned long src_offset, 312 unsigned long len); 313 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 314 unsigned long src_offset, unsigned long len); 315 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 316 unsigned long src_offset, unsigned long len); 317 void memset_extent_buffer(struct extent_buffer *eb, char c, 318 unsigned long start, unsigned long len); 319 void clear_extent_buffer_dirty(struct extent_buffer *eb); 320 int set_extent_buffer_dirty(struct extent_buffer *eb); 321 int set_extent_buffer_uptodate(struct extent_buffer *eb); 322 int clear_extent_buffer_uptodate(struct extent_buffer *eb); 323 int extent_buffer_uptodate(struct extent_buffer *eb); 324 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 325 unsigned long min_len, char **map, 326 unsigned long *map_start, 327 unsigned long *map_len); 328 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 329 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 330 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 331 struct page *locked_page, 332 unsigned long bits_to_clear, 333 unsigned long page_ops); 334 struct bio * 335 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 336 gfp_t gfp_flags); 337 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); 338 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); 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