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)(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 page *page, u64 start, u64 end, 80 struct extent_state *state, int mirror); 81 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 82 struct extent_state *state, int uptodate); 83 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 84 unsigned long *bits); 85 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 86 unsigned long *bits); 87 void (*merge_extent_hook)(struct inode *inode, 88 struct extent_state *new, 89 struct extent_state *other); 90 void (*split_extent_hook)(struct inode *inode, 91 struct extent_state *orig, u64 split); 92 }; 93 94 struct extent_io_tree { 95 struct rb_root state; 96 struct radix_tree_root buffer; 97 struct address_space *mapping; 98 u64 dirty_bytes; 99 int track_uptodate; 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 #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 extent_io_tree *tree; 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 wait_queue_head_t lock_wq; 162 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 163 #ifdef CONFIG_BTRFS_DEBUG 164 struct list_head leak_list; 165 #endif 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); 193 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 194 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 195 unsigned long bits, struct extent_state **cached); 196 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 197 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 198 struct extent_state **cached, gfp_t mask); 199 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 200 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 201 get_extent_t *get_extent, int mirror_num); 202 int __init extent_io_init(void); 203 void extent_io_exit(void); 204 205 u64 count_range_bits(struct extent_io_tree *tree, 206 u64 *start, u64 search_end, 207 u64 max_bytes, unsigned long bits, int contig); 208 209 void free_extent_state(struct extent_state *state); 210 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 211 unsigned long bits, int filled, 212 struct extent_state *cached_state); 213 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 214 unsigned long bits, gfp_t mask); 215 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 216 unsigned long bits, int wake, int delete, 217 struct extent_state **cached, gfp_t mask); 218 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 219 unsigned long bits, gfp_t mask); 220 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 221 unsigned long bits, u64 *failed_start, 222 struct extent_state **cached_state, gfp_t mask); 223 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 224 struct extent_state **cached_state, gfp_t mask); 225 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 226 struct extent_state **cached_state, gfp_t mask); 227 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 228 gfp_t mask); 229 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 230 gfp_t mask); 231 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 232 gfp_t mask); 233 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 234 unsigned long bits, unsigned long clear_bits, 235 struct extent_state **cached_state, gfp_t mask); 236 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 237 struct extent_state **cached_state, gfp_t mask); 238 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, 239 struct extent_state **cached_state, gfp_t mask); 240 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 241 u64 *start_ret, u64 *end_ret, unsigned long bits, 242 struct extent_state **cached_state); 243 int extent_invalidatepage(struct extent_io_tree *tree, 244 struct page *page, unsigned long offset); 245 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 246 get_extent_t *get_extent, 247 struct writeback_control *wbc); 248 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 249 u64 start, u64 end, get_extent_t *get_extent, 250 int mode); 251 int extent_writepages(struct extent_io_tree *tree, 252 struct address_space *mapping, 253 get_extent_t *get_extent, 254 struct writeback_control *wbc); 255 int btree_write_cache_pages(struct address_space *mapping, 256 struct writeback_control *wbc); 257 int extent_readpages(struct extent_io_tree *tree, 258 struct address_space *mapping, 259 struct list_head *pages, unsigned nr_pages, 260 get_extent_t get_extent); 261 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 262 __u64 start, __u64 len, get_extent_t *get_extent); 263 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); 264 void extent_cache_csums_dio(struct extent_io_tree *tree, u64 start, u32 csums[], 265 int count); 266 void extent_cache_csums(struct extent_io_tree *tree, struct bio *bio, 267 int bvec_index, u32 csums[], int count); 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 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 286 287 static inline unsigned long num_extent_pages(u64 start, u64 len) 288 { 289 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 290 (start >> PAGE_CACHE_SHIFT); 291 } 292 293 static inline struct page *extent_buffer_page(struct extent_buffer *eb, 294 unsigned long i) 295 { 296 return eb->pages[i]; 297 } 298 299 static inline void extent_buffer_get(struct extent_buffer *eb) 300 { 301 atomic_inc(&eb->refs); 302 } 303 304 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 305 unsigned long start, 306 unsigned long len); 307 void read_extent_buffer(struct extent_buffer *eb, void *dst, 308 unsigned long start, 309 unsigned long len); 310 void write_extent_buffer(struct extent_buffer *eb, const void *src, 311 unsigned long start, unsigned long len); 312 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 313 unsigned long dst_offset, unsigned long src_offset, 314 unsigned long len); 315 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 316 unsigned long src_offset, unsigned long len); 317 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 318 unsigned long src_offset, unsigned long len); 319 void memset_extent_buffer(struct extent_buffer *eb, char c, 320 unsigned long start, unsigned long len); 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_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, 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