Man page 9 : read_cache_pages

read_cache_pages - populate an address space with some pages & start reads against them

int read_cache_pages(struct address_space *  mapping , struct list_head *  pages , int (* filler ) (void *, struct page *), void *  data );

mapping
    the address_space

pages
    The address of a list_head which contains the target pages. These pages have their ->index populated and are otherwise uninitialised.

filler
    callback routine for filling a single page.

data
    private data for the callback routine.

Hides the details of the LRU cache etc from the filesystems.