Locate, pin and lock a page cache entry
struct page * find_lock_entry(struct address_space * mapping, pgoff_t offset);
mapping
the address_space to search
offset
the page cache index
Looks up the page cache slot at mapping & offset. If there is a page cache page, it is returned locked and with an increased refcount.
If the slot holds a shadow entry of a previously evicted page, or a swap entry from shmem/tmpfs, it is returned.
Otherwise, NULL is returned.
find_lock_entry may sleep.