Add a locked page to the pagecache
int add_to_page_cache_locked(struct page * page, struct address_space * mapping, pgoff_t offset, gfp_t gfp_mask);
page
page to add
mapping
the page's address_space
offset
page index
gfp_mask
page allocation mode
This function is used to add a page to the pagecache. It must be locked. This function does not add the page to the LRU. The caller must do that.