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 43 /* these are flags for extent_clear_unlock_delalloc */ 44 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1 45 #define EXTENT_CLEAR_UNLOCK 0x2 46 #define EXTENT_CLEAR_DELALLOC 0x4 47 #define EXTENT_CLEAR_DIRTY 0x8 48 #define EXTENT_SET_WRITEBACK 0x10 49 #define EXTENT_END_WRITEBACK 0x20 50 #define EXTENT_SET_PRIVATE2 0x40 51 #define EXTENT_CLEAR_ACCOUNTING 0x80 52 53 /* 54 * page->private values. Every page that is controlled by the extent 55 * map has page->private set to one. 56 */ 57 #define EXTENT_PAGE_PRIVATE 1 58 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 59 60 struct extent_state; 61 struct btrfs_root; 62 63 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 64 struct bio *bio, int mirror_num, 65 unsigned long bio_flags, u64 bio_offset); 66 struct extent_io_ops { 67 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 68 u64 start, u64 end, int *page_started, 69 unsigned long *nr_written); 70 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 71 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 72 extent_submit_bio_hook_t *submit_bio_hook; 73 int (*merge_bio_hook)(struct page *page, unsigned long offset, 74 size_t size, struct bio *bio, 75 unsigned long bio_flags); 76 int (*readpage_io_hook)(struct page *page, u64 start, u64 end); 77 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 78 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page, 79 u64 start, u64 end, 80 struct extent_state *state); 81 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, 82 struct extent_state *state, 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 int *bits); 87 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 88 int *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 int (*write_cache_pages_lock_hook)(struct page *page, void *data, 95 void (*flush_fn)(void *)); 96 }; 97 98 struct extent_io_tree { 99 struct rb_root state; 100 struct radix_tree_root buffer; 101 struct address_space *mapping; 102 u64 dirty_bytes; 103 int track_uptodate; 104 spinlock_t lock; 105 spinlock_t buffer_lock; 106 struct extent_io_ops *ops; 107 }; 108 109 struct extent_state { 110 u64 start; 111 u64 end; /* inclusive */ 112 struct rb_node rb_node; 113 114 /* ADD NEW ELEMENTS AFTER THIS */ 115 struct extent_io_tree *tree; 116 wait_queue_head_t wq; 117 atomic_t refs; 118 unsigned long state; 119 120 /* for use by the FS */ 121 u64 private; 122 123 struct list_head leak_list; 124 }; 125 126 #define INLINE_EXTENT_BUFFER_PAGES 16 127 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE) 128 struct extent_buffer { 129 u64 start; 130 unsigned long len; 131 unsigned long map_start; 132 unsigned long map_len; 133 unsigned long bflags; 134 struct extent_io_tree *tree; 135 spinlock_t refs_lock; 136 atomic_t refs; 137 atomic_t io_pages; 138 int read_mirror; 139 struct list_head leak_list; 140 struct rcu_head rcu_head; 141 pid_t lock_owner; 142 143 /* count of read lock holders on the extent buffer */ 144 atomic_t write_locks; 145 atomic_t read_locks; 146 atomic_t blocking_writers; 147 atomic_t blocking_readers; 148 atomic_t spinning_readers; 149 atomic_t spinning_writers; 150 int lock_nested; 151 152 /* protects write locks */ 153 rwlock_t lock; 154 155 /* readers use lock_wq while they wait for the write 156 * lock holders to unlock 157 */ 158 wait_queue_head_t write_lock_wq; 159 160 /* writers use read_lock_wq while they wait for readers 161 * to unlock 162 */ 163 wait_queue_head_t read_lock_wq; 164 wait_queue_head_t lock_wq; 165 struct page *inline_pages[INLINE_EXTENT_BUFFER_PAGES]; 166 struct page **pages; 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, gfp_t mask); 194 int try_release_extent_state(struct extent_map_tree *map, 195 struct extent_io_tree *tree, struct page *page, 196 gfp_t mask); 197 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 198 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 199 int bits, struct extent_state **cached); 200 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 201 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 202 struct extent_state **cached, gfp_t mask); 203 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 204 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 205 get_extent_t *get_extent, int mirror_num); 206 int __init extent_io_init(void); 207 void extent_io_exit(void); 208 209 u64 count_range_bits(struct extent_io_tree *tree, 210 u64 *start, u64 search_end, 211 u64 max_bytes, unsigned long bits, int contig); 212 213 void free_extent_state(struct extent_state *state); 214 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 215 int bits, int filled, struct extent_state *cached_state); 216 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 217 int bits, gfp_t mask); 218 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 219 int bits, int wake, int delete, struct extent_state **cached, 220 gfp_t mask); 221 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 222 int bits, gfp_t mask); 223 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 224 int 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 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 *find_extent_buffer(struct extent_io_tree *tree, 269 u64 start, unsigned long len); 270 void free_extent_buffer(struct extent_buffer *eb); 271 void free_extent_buffer_stale(struct extent_buffer *eb); 272 #define WAIT_NONE 0 273 #define WAIT_COMPLETE 1 274 #define WAIT_PAGE_LOCK 2 275 int read_extent_buffer_pages(struct extent_io_tree *tree, 276 struct extent_buffer *eb, u64 start, int wait, 277 get_extent_t *get_extent, int mirror_num); 278 unsigned long num_extent_pages(u64 start, u64 len); 279 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i); 280 281 static inline void extent_buffer_get(struct extent_buffer *eb) 282 { 283 atomic_inc(&eb->refs); 284 } 285 286 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 287 unsigned long start, 288 unsigned long len); 289 void read_extent_buffer(struct extent_buffer *eb, void *dst, 290 unsigned long start, 291 unsigned long len); 292 void write_extent_buffer(struct extent_buffer *eb, const void *src, 293 unsigned long start, unsigned long len); 294 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 295 unsigned long dst_offset, unsigned long src_offset, 296 unsigned long len); 297 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 298 unsigned long src_offset, unsigned long len); 299 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 300 unsigned long src_offset, unsigned long len); 301 void memset_extent_buffer(struct extent_buffer *eb, char c, 302 unsigned long start, unsigned long len); 303 void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits); 304 void clear_extent_buffer_dirty(struct extent_buffer *eb); 305 int set_extent_buffer_dirty(struct extent_buffer *eb); 306 int set_extent_buffer_uptodate(struct extent_buffer *eb); 307 int clear_extent_buffer_uptodate(struct extent_buffer *eb); 308 int extent_buffer_uptodate(struct extent_buffer *eb); 309 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 310 unsigned long min_len, char **map, 311 unsigned long *map_start, 312 unsigned long *map_len); 313 int extent_range_uptodate(struct extent_io_tree *tree, 314 u64 start, u64 end); 315 int extent_clear_unlock_delalloc(struct inode *inode, 316 struct extent_io_tree *tree, 317 u64 start, u64 end, struct page *locked_page, 318 unsigned long op); 319 struct bio * 320 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 321 gfp_t gfp_flags); 322 323 struct btrfs_mapping_tree; 324 325 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start, 326 u64 length, u64 logical, struct page *page, 327 int mirror_num); 328 int end_extent_writepage(struct page *page, int err, u64 start, u64 end); 329 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, 330 int mirror_num); 331 #endif 332