page_cache_async

page_cache_async_readahead
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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.

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