1 2 struct cached_page { 3 /* - The (dev, dev_offset) pair are unique; 4 * the (ino, ino_offset) pair is information and 5 * might be missing. duplicate do not make sense 6 * although it won't bother VM much. 7 * - dev must always be valid, i.e. not NO_DEV 8 * - ino may be unknown, i.e. VMC_NO_INODE 9 */ 10 dev_t dev; /* which dev is it on */ 11 u64_t dev_offset; /* offset within dev */ 12 13 ino_t ino; /* which ino is it about */ 14 u64_t ino_offset; /* offset within ino */ 15 struct phys_block *page; /* page ptr */ 16 struct cached_page *older; /* older in lru chain */ 17 struct cached_page *newer; /* newer in lru chain */ 18 struct cached_page *hash_next_dev; /* next in hash chain (bydev) */ 19 struct cached_page *hash_next_ino; /* next in hash chain (byino) */ 20 }; 21 22