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readahead: data structure and routines

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Extend struct file_ra_state to support the on-demand readahead logic.  Also
define some helpers for it.

Signed-off-by: Fengguang Wu <[email protected]>
Cc: Steven Pratt <[email protected]>
Cc: Ram Pai <[email protected]>
Cc: Rusty Russell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Fengguang Wu 2007-07-19 01:47:59 -07:00 • committed by Linus Torvalds
commit 5ce1110b92
2 changed files with 83 additions and 0 deletions
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19
mm/readahead.c
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@ -592,3 +592,22 @@ unsigned long max_sane_readahead(unsigned long nr)
return min(nr, (node_page_state(numa_node_id(), NR_INACTIVE)
+ node_page_state(numa_node_id(), NR_FREE_PAGES)) / 2);
}
/*
* Submit IO for the read-ahead request in file_ra_state.
*/
unsigned long ra_submit(struct file_ra_state *ra,
struct address_space *mapping, struct file *filp)
{
unsigned long ra_size;
unsigned long la_size;
int actual;
ra_size = ra_readahead_size(ra);
la_size = ra_lookahead_size(ra);
actual = __do_page_cache_readahead(mapping, filp,
ra->ra_index, ra_size, la_size);
return actual;
}
EXPORT_SYMBOL_GPL(ra_submit);