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