Man page 9 : find_or_create_page

find_or_create_page - locate or add a pagecache page

struct page * find_or_create_page(struct address_space *  mapping , pgoff_t  index , gfp_t  gfp_mask );

mapping
    the pageAqs address_space

index
    the pageAqs index into the mapping

gfp_mask
    page allocation mode

Locates a page in the pagecache. If the page is not present, a new page is allocated using gfp_mask and is added to the pagecache and to the VMAqs LRU list. The returned page is locked and has its reference count incremented.

find_or_create_page may sleep, even if gfp_flags specifies an atomic allocation!

find_or_create_page returns the desired pageAqs address, or zero on memory exhaustion.