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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) 21 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) 22 23 /* 24 * flags for bio submission. The high bits indicate the compression 25 * type for this bio 26 */ 27 #define EXTENT_BIO_COMPRESSED 1 28 #define EXTENT_BIO_FLAG_SHIFT 16 29 30 /* these are bit numbers for test/set bit */ 31 #define EXTENT_BUFFER_UPTODATE 0 32 #define EXTENT_BUFFER_BLOCKING 1 33 #define EXTENT_BUFFER_DIRTY 2 34 35 /* these are flags for extent_clear_unlock_delalloc */ 36 #define EXTENT_CLEAR_UNLOCK_PAGE 0x1 37 #define EXTENT_CLEAR_UNLOCK 0x2 38 #define EXTENT_CLEAR_DELALLOC 0x4 39 #define EXTENT_CLEAR_DIRTY 0x8 40 #define EXTENT_SET_WRITEBACK 0x10 41 #define EXTENT_END_WRITEBACK 0x20 42 #define EXTENT_SET_PRIVATE2 0x40 43 #define EXTENT_CLEAR_ACCOUNTING 0x80 44 45 /* 46 * page->private values. Every page that is controlled by the extent 47 * map has page->private set to one. 48 */ 49 #define EXTENT_PAGE_PRIVATE 1 50 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 51 52 struct extent_state; 53 54 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 55 struct bio *bio, int mirror_num, 56 unsigned long bio_flags, u64 bio_offset); 57 struct extent_io_ops { 58 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 59 u64 start, u64 end, int *page_started, 60 unsigned long *nr_written); 61 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 62 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 63 extent_submit_bio_hook_t *submit_bio_hook; 64 int (*merge_bio_hook)(struct page *page, unsigned long offset, 65 size_t size, struct bio *bio, 66 unsigned long bio_flags); 67 int (*readpage_io_hook)(struct page *page, u64 start, u64 end); 68 int (*readpage_io_failed_hook)(struct bio *bio, struct page *page, 69 u64 start, u64 end, 70 struct extent_state *state); 71 int (*writepage_io_failed_hook)(struct bio *bio, struct page *page, 72 u64 start, u64 end, 73 struct extent_state *state); 74 int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end, 75 struct extent_state *state); 76 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 77 struct extent_state *state, int uptodate); 78 int (*set_bit_hook)(struct inode *inode, struct extent_state *state, 79 int *bits); 80 int (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 81 int *bits); 82 int (*merge_extent_hook)(struct inode *inode, 83 struct extent_state *new, 84 struct extent_state *other); 85 int (*split_extent_hook)(struct inode *inode, 86 struct extent_state *orig, u64 split); 87 int (*write_cache_pages_lock_hook)(struct page *page); 88 }; 89 90 struct extent_io_tree { 91 struct rb_root state; 92 struct radix_tree_root buffer; 93 struct address_space *mapping; 94 u64 dirty_bytes; 95 spinlock_t lock; 96 spinlock_t buffer_lock; 97 struct extent_io_ops *ops; 98 }; 99 100 struct extent_state { 101 u64 start; 102 u64 end; /* inclusive */ 103 struct rb_node rb_node; 104 105 /* ADD NEW ELEMENTS AFTER THIS */ 106 struct extent_io_tree *tree; 107 wait_queue_head_t wq; 108 atomic_t refs; 109 unsigned long state; 110 u64 split_start; 111 u64 split_end; 112 113 /* for use by the FS */ 114 u64 private; 115 116 struct list_head leak_list; 117 }; 118 119 struct extent_buffer { 120 u64 start; 121 unsigned long len; 122 char *map_token; 123 char *kaddr; 124 unsigned long map_start; 125 unsigned long map_len; 126 struct page *first_page; 127 unsigned long bflags; 128 atomic_t refs; 129 struct list_head leak_list; 130 struct rcu_head rcu_head; 131 132 /* the spinlock is used to protect most operations */ 133 spinlock_t lock; 134 135 /* 136 * when we keep the lock held while blocking, waiters go onto 137 * the wq 138 */ 139 wait_queue_head_t lock_wq; 140 }; 141 142 static inline void extent_set_compress_type(unsigned long *bio_flags, 143 int compress_type) 144 { 145 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 146 } 147 148 static inline int extent_compress_type(unsigned long bio_flags) 149 { 150 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 151 } 152 153 struct extent_map_tree; 154 155 static inline struct extent_state *extent_state_next(struct extent_state *state) 156 { 157 struct rb_node *node; 158 node = rb_next(&state->rb_node); 159 if (!node) 160 return NULL; 161 return rb_entry(node, struct extent_state, rb_node); 162 } 163 164 typedef struct extent_map *(get_extent_t)(struct inode *inode, 165 struct page *page, 166 size_t page_offset, 167 u64 start, u64 len, 168 int create); 169 170 void extent_io_tree_init(struct extent_io_tree *tree, 171 struct address_space *mapping, gfp_t mask); 172 int try_release_extent_mapping(struct extent_map_tree *map, 173 struct extent_io_tree *tree, struct page *page, 174 gfp_t mask); 175 int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page); 176 int try_release_extent_state(struct extent_map_tree *map, 177 struct extent_io_tree *tree, struct page *page, 178 gfp_t mask); 179 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); 180 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 181 int bits, struct extent_state **cached, gfp_t mask); 182 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); 183 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 184 struct extent_state **cached, gfp_t mask); 185 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end, 186 gfp_t mask); 187 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 188 get_extent_t *get_extent); 189 int __init extent_io_init(void); 190 void extent_io_exit(void); 191 192 u64 count_range_bits(struct extent_io_tree *tree, 193 u64 *start, u64 search_end, 194 u64 max_bytes, unsigned long bits, int contig); 195 196 void free_extent_state(struct extent_state *state); 197 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 198 int bits, int filled, struct extent_state *cached_state); 199 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 200 int bits, gfp_t mask); 201 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 202 int bits, int wake, int delete, struct extent_state **cached, 203 gfp_t mask); 204 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 205 int bits, gfp_t mask); 206 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 207 int bits, int exclusive_bits, u64 *failed_start, 208 struct extent_state **cached_state, gfp_t mask); 209 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 210 gfp_t mask); 211 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 212 gfp_t mask); 213 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 214 gfp_t mask); 215 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 216 gfp_t mask); 217 int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end, 218 gfp_t mask); 219 int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start, 220 u64 end, gfp_t mask); 221 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 222 struct extent_state **cached_state, gfp_t mask); 223 int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end, 224 gfp_t mask); 225 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 226 u64 *start_ret, u64 *end_ret, int bits); 227 struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, 228 u64 start, int bits); 229 int extent_invalidatepage(struct extent_io_tree *tree, 230 struct page *page, unsigned long offset); 231 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 232 get_extent_t *get_extent, 233 struct writeback_control *wbc); 234 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 235 u64 start, u64 end, get_extent_t *get_extent, 236 int mode); 237 int extent_writepages(struct extent_io_tree *tree, 238 struct address_space *mapping, 239 get_extent_t *get_extent, 240 struct writeback_control *wbc); 241 int extent_readpages(struct extent_io_tree *tree, 242 struct address_space *mapping, 243 struct list_head *pages, unsigned nr_pages, 244 get_extent_t get_extent); 245 int extent_prepare_write(struct extent_io_tree *tree, 246 struct inode *inode, struct page *page, 247 unsigned from, unsigned to, get_extent_t *get_extent); 248 int extent_commit_write(struct extent_io_tree *tree, 249 struct inode *inode, struct page *page, 250 unsigned from, unsigned to); 251 sector_t extent_bmap(struct address_space *mapping, sector_t iblock, 252 get_extent_t *get_extent); 253 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 254 __u64 start, __u64 len, get_extent_t *get_extent); 255 int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end); 256 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); 257 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 258 void set_page_extent_mapped(struct page *page); 259 260 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 261 u64 start, unsigned long len, 262 struct page *page0, 263 gfp_t mask); 264 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, 265 u64 start, unsigned long len, 266 gfp_t mask); 267 void free_extent_buffer(struct extent_buffer *eb); 268 int read_extent_buffer_pages(struct extent_io_tree *tree, 269 struct extent_buffer *eb, u64 start, int wait, 270 get_extent_t *get_extent, int mirror_num); 271 272 static inline void extent_buffer_get(struct extent_buffer *eb) 273 { 274 atomic_inc(&eb->refs); 275 } 276 277 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 278 unsigned long start, 279 unsigned long len); 280 void read_extent_buffer(struct extent_buffer *eb, void *dst, 281 unsigned long start, 282 unsigned long len); 283 void write_extent_buffer(struct extent_buffer *eb, const void *src, 284 unsigned long start, unsigned long len); 285 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 286 unsigned long dst_offset, unsigned long src_offset, 287 unsigned long len); 288 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 289 unsigned long src_offset, unsigned long len); 290 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 291 unsigned long src_offset, unsigned long len); 292 void memset_extent_buffer(struct extent_buffer *eb, char c, 293 unsigned long start, unsigned long len); 294 int wait_on_extent_buffer_writeback(struct extent_io_tree *tree, 295 struct extent_buffer *eb); 296 int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end); 297 int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits); 298 int clear_extent_buffer_dirty(struct extent_io_tree *tree, 299 struct extent_buffer *eb); 300 int set_extent_buffer_dirty(struct extent_io_tree *tree, 301 struct extent_buffer *eb); 302 int test_extent_buffer_dirty(struct extent_io_tree *tree, 303 struct extent_buffer *eb); 304 int set_extent_buffer_uptodate(struct extent_io_tree *tree, 305 struct extent_buffer *eb); 306 int clear_extent_buffer_uptodate(struct extent_io_tree *tree, 307 struct extent_buffer *eb, 308 struct extent_state **cached_state); 309 int extent_buffer_uptodate(struct extent_io_tree *tree, 310 struct extent_buffer *eb, 311 struct extent_state *cached_state); 312 int map_extent_buffer(struct extent_buffer *eb, unsigned long offset, 313 unsigned long min_len, char **token, char **map, 314 unsigned long *map_start, 315 unsigned long *map_len, int km); 316 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 317 unsigned long min_len, char **token, char **map, 318 unsigned long *map_start, 319 unsigned long *map_len, int km); 320 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km); 321 int release_extent_buffer_tail_pages(struct extent_buffer *eb); 322 int extent_range_uptodate(struct extent_io_tree *tree, 323 u64 start, u64 end); 324 int extent_clear_unlock_delalloc(struct inode *inode, 325 struct extent_io_tree *tree, 326 u64 start, u64 end, struct page *locked_page, 327 unsigned long op); 328 struct bio * 329 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 330 gfp_t gfp_flags); 331 #endif 332