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 39 /* these are flags for extent_clear_unlock_delalloc */ 40 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1 41 #define EXTENT_CLEAR_UNLOCK 0x2 42 #define EXTENT_CLEAR_DELALLOC 0x4 43 #define EXTENT_CLEAR_DIRTY 0x8 44 #define EXTENT_SET_WRITEBACK 0x10 45 #define EXTENT_END_WRITEBACK 0x20 46 #define EXTENT_SET_PRIVATE2 0x40 47 #define EXTENT_CLEAR_ACCOUNTING 0x80 48 49 /* 50 * page->private values. Every page that is controlled by the extent 51 * map has page->private set to one. 52 */ 53 #define EXTENT_PAGE_PRIVATE 1 54 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 55 56 struct extent_state; 57 58 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 59 struct bio *bio, int mirror_num, 60 unsigned long bio_flags, u64 bio_offset); 61 struct extent_io_ops { 62 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 63 u64 start, u64 end, int *page_started, 64 unsigned long *nr_written); 65 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 66 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 67 extent_submit_bio_hook_t *submit_bio_hook; 68 int (*merge_bio_hook)(struct page *page, unsigned long offset, 69 size_t size, struct bio *bio, 70 unsigned long bio_flags); 71 int (*readpage_io_hook)(struct page *page, u64 start, u64 end); 72 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page, 73 u64 start, u64 end, int failed_mirror, 74 struct extent_state *state); 75 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page, 76 u64 start, u64 end, 77 struct extent_state *state); 78 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, 79 struct extent_state *state); 80 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 81 struct extent_state *state, int uptodate); 82 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 83 int *bits); 84 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 85 int *bits); 86 void (*merge_extent_hook)(struct inode *inode, 87 struct extent_state *new, 88 struct extent_state *other); 89 void (*split_extent_hook)(struct inode *inode, 90 struct extent_state *orig, u64 split); 91 int (*write_cache_pages_lock_hook)(struct page *page, void *data, 92 void (*flush_fn)(void *)); 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 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 struct list_head leak_list; 120 }; 121 122 struct extent_buffer { 123 u64 start; 124 unsigned long len; 125 unsigned long map_start; 126 unsigned long map_len; 127 struct page *first_page; 128 unsigned long bflags; 129 struct list_head leak_list; 130 struct rcu_head rcu_head; 131 atomic_t refs; 132 pid_t lock_owner; 133 134 /* count of read lock holders on the extent buffer */ 135 atomic_t write_locks; 136 atomic_t read_locks; 137 atomic_t blocking_writers; 138 atomic_t blocking_readers; 139 atomic_t spinning_readers; 140 atomic_t spinning_writers; 141 int lock_nested; 142 143 /* protects write locks */ 144 rwlock_t lock; 145 146 /* readers use lock_wq while they wait for the write 147 * lock holders to unlock 148 */ 149 wait_queue_head_t write_lock_wq; 150 151 /* writers use read_lock_wq while they wait for readers 152 * to unlock 153 */ 154 wait_queue_head_t read_lock_wq; 155 }; 156 157 static inline void extent_set_compress_type(unsigned long *bio_flags, 158 int compress_type) 159 { 160 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 161 } 162 163 static inline int extent_compress_type(unsigned long bio_flags) 164 { 165 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 166 } 167 168 struct extent_map_tree; 169 170 typedef struct extent_map *(get_extent_t)(struct inode *inode, 171 struct page *page, 172 size_t pg_offset, 173 u64 start, u64 len, 174 int create); 175 176 void extent_io_tree_init(struct extent_io_tree *tree, 177 struct address_space *mapping); 178 int try_release_extent_mapping(struct extent_map_tree *map, 179 struct extent_io_tree *tree, struct page *page, 180 gfp_t mask); 181 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page); 182 int try_release_extent_state(struct extent_map_tree *map, 183 struct extent_io_tree *tree, struct page *page, 184 gfp_t mask); 185 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); 186 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 187 int bits, struct extent_state **cached, gfp_t mask); 188 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); 189 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 190 struct extent_state **cached, gfp_t mask); 191 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end, 192 gfp_t mask); 193 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 194 get_extent_t *get_extent, int mirror_num); 195 int __init extent_io_init(void); 196 void extent_io_exit(void); 197 198 u64 count_range_bits(struct extent_io_tree *tree, 199 u64 *start, u64 search_end, 200 u64 max_bytes, unsigned long bits, int contig); 201 202 void free_extent_state(struct extent_state *state); 203 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 204 int bits, int filled, struct extent_state *cached_state); 205 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 206 int bits, gfp_t mask); 207 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 208 int bits, int wake, int delete, struct extent_state **cached, 209 gfp_t mask); 210 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 211 int bits, gfp_t mask); 212 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 213 int bits, int exclusive_bits, u64 *failed_start, 214 struct extent_state **cached_state, gfp_t mask); 215 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 216 struct extent_state **cached_state, gfp_t mask); 217 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 218 gfp_t mask); 219 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 220 gfp_t mask); 221 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 222 gfp_t mask); 223 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 224 int bits, int clear_bits, gfp_t mask); 225 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 226 struct extent_state **cached_state, gfp_t mask); 227 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 228 u64 *start_ret, u64 *end_ret, int bits); 229 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, 230 u64 start, int bits); 231 int extent_invalidatepage(struct extent_io_tree *tree, 232 struct page *page, unsigned long offset); 233 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 234 get_extent_t *get_extent, 235 struct writeback_control *wbc); 236 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 237 u64 start, u64 end, get_extent_t *get_extent, 238 int mode); 239 int extent_writepages(struct extent_io_tree *tree, 240 struct address_space *mapping, 241 get_extent_t *get_extent, 242 struct writeback_control *wbc); 243 int extent_readpages(struct extent_io_tree *tree, 244 struct address_space *mapping, 245 struct list_head *pages, unsigned nr_pages, 246 get_extent_t get_extent); 247 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 248 __u64 start, __u64 len, get_extent_t *get_extent); 249 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); 250 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 251 void set_page_extent_mapped(struct page *page); 252 253 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 254 u64 start, unsigned long len, 255 struct page *page0); 256 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, 257 u64 start, unsigned long len); 258 void free_extent_buffer(struct extent_buffer *eb); 259 #define WAIT_NONE 0 260 #define WAIT_COMPLETE 1 261 #define WAIT_PAGE_LOCK 2 262 int read_extent_buffer_pages(struct extent_io_tree *tree, 263 struct extent_buffer *eb, u64 start, int wait, 264 get_extent_t *get_extent, int mirror_num); 265 unsigned long num_extent_pages(u64 start, u64 len); 266 struct page *extent_buffer_page(struct extent_buffer *eb, unsigned long i); 267 268 static inline void extent_buffer_get(struct extent_buffer *eb) 269 { 270 atomic_inc(&eb->refs); 271 } 272 273 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 274 unsigned long start, 275 unsigned long len); 276 void read_extent_buffer(struct extent_buffer *eb, void *dst, 277 unsigned long start, 278 unsigned long len); 279 void write_extent_buffer(struct extent_buffer *eb, const void *src, 280 unsigned long start, unsigned long len); 281 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 282 unsigned long dst_offset, unsigned long src_offset, 283 unsigned long len); 284 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 285 unsigned long src_offset, unsigned long len); 286 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 287 unsigned long src_offset, unsigned long len); 288 void memset_extent_buffer(struct extent_buffer *eb, char c, 289 unsigned long start, unsigned long len); 290 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits); 291 int clear_extent_buffer_dirty(struct extent_io_tree *tree, 292 struct extent_buffer *eb); 293 int set_extent_buffer_dirty(struct extent_io_tree *tree, 294 struct extent_buffer *eb); 295 int set_extent_buffer_uptodate(struct extent_io_tree *tree, 296 struct extent_buffer *eb); 297 int clear_extent_buffer_uptodate(struct extent_io_tree *tree, 298 struct extent_buffer *eb, 299 struct extent_state **cached_state); 300 int extent_buffer_uptodate(struct extent_io_tree *tree, 301 struct extent_buffer *eb, 302 struct extent_state *cached_state); 303 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 304 unsigned long min_len, char **map, 305 unsigned long *map_start, 306 unsigned long *map_len); 307 int extent_range_uptodate(struct extent_io_tree *tree, 308 u64 start, u64 end); 309 int extent_clear_unlock_delalloc(struct inode *inode, 310 struct extent_io_tree *tree, 311 u64 start, u64 end, struct page *locked_page, 312 unsigned long op); 313 struct bio * 314 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 315 gfp_t gfp_flags); 316 317 struct btrfs_mapping_tree; 318 319 int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start, 320 u64 length, u64 logical, struct page *page, 321 int mirror_num); 322 int end_extent_writepage(struct page *page, int err, u64 start, u64 end); 323 #endif 324