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