read_cache_page - read into page cache, fill it if needed
2. SYNOPSIS ▲
struct page * read_cache_page(struct address_space * mapping , pgoff_t index , int (* filler ) (void *, struct page *), void * data );
3. ARGUMENTS ▲
the pageAqs address_space
the page index
function to perform the read
first arg to filler(data, page) function, often left as NULL
4. DESCRIPTION ▲
Read into the page cache. If a page already exists, and PageUptodate is not set, try to fill the page then wait for it to become unlocked.
If the page does not get brought uptodate, return -EIO.
5. COPYRIGHT ▲