readahead: combine file_ra_state.prev_index/prev_offset into prev_pos

Combine the file_ra_state members
				unsigned long prev_index
				unsigned int prev_offset
into
				loff_t prev_pos

It is more consistent and better supports huge files.

Thanks to Peter for the nice proposal!

[akpm@linux-foundation.org: fix shift overflow]
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/splice.c b/fs/splice.c
index e95a36228863..2df6be43c667 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -447,7 +447,7 @@ fill_it:
          */
         while (page_nr < nr_pages)
                 page_cache_release(pages[page_nr++]);
-        in->f_ra.prev_index = index;
+        in->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
 
         if (spd.nr_pages)
                 return splice_to_pipe(pipe, &spd);