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readahead: split ondemand readahead interface into two functions

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Split ondemand readahead interface into two functions.  I think this makes it
a little clearer for non-readahead experts (like Rusty).

Internally they both call ondemand_readahead(), but the page argument is
changed to an obvious boolean flag.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell 2007-07-19 01:48:08 -07:00 • committed by Linus Torvalds
parent fe3cba17c4
commit cf914a7d65
6 changed files with 85 additions and 56 deletions
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6
fs/splice.c
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@ -295,8 +295,8 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
* readahead/allocate the rest and fill in the holes.
*/
if (spd.nr_pages < nr_pages)
page_cache_readahead_ondemand(mapping, &in->f_ra, in,
NULL, index, req_pages - spd.nr_pages);
page_cache_sync_readahead(mapping, &in->f_ra, in,
index, req_pages - spd.nr_pages);
error = 0;
while (spd.nr_pages < nr_pages) {
@ -352,7 +352,7 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
page = pages[page_nr];
if (PageReadahead(page))
page_cache_readahead_ondemand(mapping, &in->f_ra, in,
page_cache_async_readahead(mapping, &in->f_ra, in,
page, index, req_pages - page_nr);
/*