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 #define EXTENT_BUFFER_TREE_REF 5 39 #define EXTENT_BUFFER_STALE 6 40 #define EXTENT_BUFFER_WRITEBACK 7 41 #define EXTENT_BUFFER_IOERR 8 42 #define EXTENT_BUFFER_DUMMY 9 43 44 /* these are flags for extent_clear_unlock_delalloc */ 45 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1 46 #define EXTENT_CLEAR_UNLOCK 0x2 47 #define EXTENT_CLEAR_DELALLOC 0x4 48 #define EXTENT_CLEAR_DIRTY 0x8 49 #define EXTENT_SET_WRITEBACK 0x10 50 #define EXTENT_END_WRITEBACK 0x20 51 #define EXTENT_SET_PRIVATE2 0x40 52 #define EXTENT_CLEAR_ACCOUNTING 0x80 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 64 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 65 struct bio *bio, int mirror_num, 66 unsigned long bio_flags, u64 bio_offset); 67 struct extent_io_ops { 68 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 69 u64 start, u64 end, int *page_started, 70 unsigned long *nr_written); 71 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 72 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 73 extent_submit_bio_hook_t *submit_bio_hook; 74 int (*merge_bio_hook)(struct page *page, unsigned long offset, 75 size_t size, struct bio *bio, 76 unsigned long bio_flags); 77 int (*readpage_io_hook)(struct page *page, u64 start, u64 end); 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 int *bits); 85 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 86 int *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 int (*write_cache_pages_lock_hook)(struct page *page, void *data, 93 void (*flush_fn)(void *)); 94 }; 95 96 struct extent_io_tree { 97 struct rb_root state; 98 struct radix_tree_root buffer; 99 struct address_space *mapping; 100 u64 dirty_bytes; 101 int track_uptodate; 102 spinlock_t lock; 103 spinlock_t buffer_lock; 104 struct extent_io_ops *ops; 105 }; 106 107 struct extent_state { 108 u64 start; 109 u64 end; /* inclusive */ 110 struct rb_node rb_node; 111 112 /* ADD NEW ELEMENTS AFTER THIS */ 113 struct extent_io_tree *tree; 114 wait_queue_head_t wq; 115 atomic_t refs; 116 unsigned long state; 117 118 /* for use by the FS */ 119 u64 private; 120 121 struct list_head leak_list; 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 list_head leak_list; 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 *inline_pages[INLINE_EXTENT_BUFFER_PAGES]; 164 struct page **pages; 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, gfp_t mask); 192 int try_release_extent_state(struct extent_map_tree *map, 193 struct extent_io_tree *tree, struct page *page, 194 gfp_t mask); 195 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 196 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 197 int bits, struct extent_state **cached); 198 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 199 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 200 struct extent_state **cached, gfp_t mask); 201 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 202 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 203 get_extent_t *get_extent, int mirror_num); 204 int __init extent_io_init(void); 205 void extent_io_exit(void); 206 207 u64 count_range_bits(struct extent_io_tree *tree, 208 u64 *start, u64 search_end, 209 u64 max_bytes, unsigned long bits, int contig); 210 211 void free_extent_state(struct extent_state *state); 212 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 213 int bits, int filled, struct extent_state *cached_state); 214 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 215 int bits, gfp_t mask); 216 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 217 int bits, int wake, int delete, struct extent_state **cached, 218 gfp_t mask); 219 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 220 int bits, gfp_t mask); 221 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 222 int 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 int bits, int clear_bits, 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 find_first_extent_bit(struct extent_io_tree *tree, u64 start, 239 u64 *start_ret, u64 *end_ret, int bits); 240 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, 241 u64 start, int bits); 242 int extent_invalidatepage(struct extent_io_tree *tree, 243 struct page *page, unsigned long offset); 244 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 245 get_extent_t *get_extent, 246 struct writeback_control *wbc); 247 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 248 u64 start, u64 end, get_extent_t *get_extent, 249 int mode); 250 int extent_writepages(struct extent_io_tree *tree, 251 struct address_space *mapping, 252 get_extent_t *get_extent, 253 struct writeback_control *wbc); 254 int btree_write_cache_pages(struct address_space *mapping, 255 struct writeback_control *wbc); 256 int extent_readpages(struct extent_io_tree *tree, 257 struct address_space *mapping, 258 struct list_head *pages, unsigned nr_pages, 259 get_extent_t get_extent); 260 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 261 __u64 start, __u64 len, get_extent_t *get_extent); 262 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); 263 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 264 void set_page_extent_mapped(struct page *page); 265 266 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 267 u64 start, unsigned long len); 268 struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len); 269 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 270 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, 271 u64 start, unsigned long len); 272 void free_extent_buffer(struct extent_buffer *eb); 273 void free_extent_buffer_stale(struct extent_buffer *eb); 274 #define WAIT_NONE 0 275 #define WAIT_COMPLETE 1 276 #define WAIT_PAGE_LOCK 2 277 int read_extent_buffer_pages(struct extent_io_tree *tree, 278 struct extent_buffer *eb, u64 start, int wait, 279 get_extent_t *get_extent, int mirror_num); 280 unsigned long num_extent_pages(u64 start, u64 len); 281 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i); 282 283 static inline void extent_buffer_get(struct extent_buffer *eb) 284 { 285 atomic_inc(&eb->refs); 286 } 287 288 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 289 unsigned long start, 290 unsigned long len); 291 void read_extent_buffer(struct extent_buffer *eb, void *dst, 292 unsigned long start, 293 unsigned long len); 294 void write_extent_buffer(struct extent_buffer *eb, const void *src, 295 unsigned long start, unsigned long len); 296 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 297 unsigned long dst_offset, unsigned long src_offset, 298 unsigned long len); 299 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 300 unsigned long src_offset, unsigned long len); 301 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 302 unsigned long src_offset, unsigned long len); 303 void memset_extent_buffer(struct extent_buffer *eb, char c, 304 unsigned long start, unsigned long len); 305 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits); 306 void clear_extent_buffer_dirty(struct extent_buffer *eb); 307 int set_extent_buffer_dirty(struct extent_buffer *eb); 308 int set_extent_buffer_uptodate(struct extent_buffer *eb); 309 int clear_extent_buffer_uptodate(struct extent_buffer *eb); 310 int extent_buffer_uptodate(struct extent_buffer *eb); 311 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 312 unsigned long min_len, char **map, 313 unsigned long *map_start, 314 unsigned long *map_len); 315 int extent_range_uptodate(struct extent_io_tree *tree, 316 u64 start, u64 end); 317 int extent_clear_unlock_delalloc(struct inode *inode, 318 struct extent_io_tree *tree, 319 u64 start, u64 end, struct page *locked_page, 320 unsigned long op); 321 struct bio * 322 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 323 gfp_t gfp_flags); 324 325 struct btrfs_mapping_tree; 326 327 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start, 328 u64 length, u64 logical, struct page *page, 329 int mirror_num); 330 int end_extent_writepage(struct page *page, int err, u64 start, u64 end); 331 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, 332 int mirror_num); 333 #endif 334