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); |
mappingthe page's address_space
indexthe page's index into the mapping
gfp_maskpage 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 VM's
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 page's address, or zero on
memory exhaustion.