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struct cached_page {
/* - The (dev, dev_offset) pair are unique;
* the (ino, ino_offset) pair is information and
* might be missing. duplicate do not make sense
* although it won't bother VM much.
* - dev must always be valid, i.e. not NO_DEV
* - ino may be unknown, i.e. VMC_NO_INODE
*/
dev_t dev; /* which dev is it on */
u64_t dev_offset; /* offset within dev */
ino_t ino; /* which ino is it about */
u64_t ino_offset; /* offset within ino */
int flags; /* currently only VMSF_ONCE or 0 */
struct phys_block *page; /* page ptr */
struct cached_page *older; /* older in lru chain */
struct cached_page *newer; /* newer in lru chain */
struct cached_page *hash_next_dev; /* next in hash chain (bydev) */
struct cached_page *hash_next_ino; /* next in hash chain (byino) */
};
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