readahead: split ondemand readahead interface into two functions

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>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/splice.c b/fs/splice.c
index 6ddd0329f866..22496d2a73fa 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -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);
 
                 /*