swapfile: rearrange scan and swap_info

Before making functional changes, rearrange scan_swap_map() to simplify
subsequent diffs.  Actually, there is one functional change in there:
leave cluster_nr negative while scanning for a new cluster - resetting it
early increased the likelihood that when we have difficulty finding a free
cluster, another task may come in and try doing exactly the same - just a
waste of cpu.

Before making functional changes, rearrange struct swap_info_struct
slightly: flags will be needed as an unsigned long (for wait_on_bit), next
is a good int to pair with prio, old_block_size is uninteresting so shift
it to the end.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 410c8e473727..9cabb8b21aba 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -133,14 +133,14 @@ enum {
  * The in-memory structure used to track swap areas.
  */
 struct swap_info_struct {
-        unsigned int flags;
+        unsigned long flags;
         int prio;                       /* swap priority */
+        int next;                       /* next entry on swap list */
         struct file *swap_file;
         struct block_device *bdev;
         struct list_head extent_list;
         struct swap_extent *curr_swap_extent;
-        unsigned old_block_size;
-        unsigned short * swap_map;
+        unsigned short *swap_map;
         unsigned int lowest_bit;
         unsigned int highest_bit;
         unsigned int cluster_next;
@@ -148,7 +148,7 @@ struct swap_info_struct {
         unsigned int pages;
         unsigned int max;
         unsigned int inuse_pages;
-        int next;                       /* next entry on swap list */
+        unsigned int old_block_size;
 };
 
 struct swap_list_t {