page_cache_async_rea(9)
NAME
page_cache_async_readahead - file readahead for marked pages
SYNOPSIS
void page_cache_async_readahead(struct address_space * mapping,
struct file_ra_state * ra,
struct file * filp, struct page * page,
pgoff_t offset,
unsigned long req_size);
ARGUMENTS
- mapping
- address_space which holds the pagecache and I/O vectors
- ra
- file_ra_state which holds the readahead state
- filp
- passed on to ->readpage and ->readpages
- page
- the page at offset which has the PG_readahead flag set
- offset
- start offset into mapping, in pagecache page-sized units
- req_size
- hint: total size of the read which the caller is performing in
pagecache pages
DESCRIPTION
page_cache_async_ondemand should be called when a page is used which
has the PG_readahead flag; this is a marker to suggest that the
application has used up enough of the readahead window that we should
start pulling in more pages.