read_cache_page (9) Linux Manual Page
read_cache_page – read into page cache, fill it if needed
Synopsis
struct page *read_cache_page(struct address_space *mapping, pgoff_t index, int (*filler)(void *, struct page *), void *data);Arguments
mapping
-
- the page’s address_space
index
- the page index
filler
- function to perform the read
data
- first arg to filler(data, page) function, often left as NULL
Description
Read into the page cache. If a page already exists, and PageUptodate is not set, try to fill the page and wait for it to become unlocked.
If the page does not get brought uptodate, return -EIO.