dm writecache: return void from functions

The functions writecache_map_remap_origin and writecache_bio_copy_ssd
only return a single value, thus they can be made to return void.

This helps simplify the following IO accounting changes.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index d572135cd43fa7136ebce00e20bb548c4ce80c58..9e14717c46a987632b72d9baeaf41074e22b3d5e 100644 (file)
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -1329,8 +1329,8 @@ enum wc_map_op {
        WC_MAP_ERROR,
 };
 
-static enum wc_map_op writecache_map_remap_origin(struct dm_writecache *wc, struct bio *bio,
-                                                 struct wc_entry *e)
+static void writecache_map_remap_origin(struct dm_writecache *wc, struct bio *bio,
+                                       struct wc_entry *e)
 {
        if (e) {
                sector_t next_boundary =
@@ -1338,8 +1338,6 @@ static enum wc_map_op writecache_map_remap_origin(struct dm_writecache *wc, stru
                if (next_boundary < bio->bi_iter.bi_size >> SECTOR_SHIFT)
                        dm_accept_partial_bio(bio, next_boundary);
        }
-
-       return WC_MAP_REMAP_ORIGIN;
 }
 
 static enum wc_map_op writecache_map_read(struct dm_writecache *wc, struct bio *bio)
@@ -1366,14 +1364,15 @@ read_next_block:
                        map_op = WC_MAP_REMAP;
                }
        } else {
-               map_op = writecache_map_remap_origin(wc, bio, e);
+               writecache_map_remap_origin(wc, bio, e);
+               map_op = WC_MAP_REMAP_ORIGIN;
        }
 
        return map_op;
 }
 
-static enum wc_map_op writecache_bio_copy_ssd(struct dm_writecache *wc, struct bio *bio,
-                                             struct wc_entry *e, bool search_used)
+static void writecache_bio_copy_ssd(struct dm_writecache *wc, struct bio *bio,
+                                   struct wc_entry *e, bool search_used)
 {
        unsigned bio_size = wc->block_size;
        sector_t start_cache_sec = cache_sector(wc, e);
@@ -1419,8 +1418,6 @@ static enum wc_map_op writecache_bio_copy_ssd(struct dm_writecache *wc, struct b
        } else {
                writecache_schedule_autocommit(wc);
        }
-
-       return WC_MAP_REMAP;
 }
 
 static enum wc_map_op writecache_map_write(struct dm_writecache *wc, struct bio *bio)
@@ -1458,7 +1455,8 @@ static enum wc_map_op writecache_map_write(struct dm_writecache *wc, struct bio
 direct_write:
                                wc->stats.writes_around++;
                                e = writecache_find_entry(wc, bio->bi_iter.bi_sector, WFE_RETURN_FOLLOWING);
-                               return writecache_map_remap_origin(wc, bio, e);
+                               writecache_map_remap_origin(wc, bio, e);
+                               return WC_MAP_REMAP_ORIGIN;
                        }
                        wc->stats.writes_blocked_on_freelist++;
                        writecache_wait_on_freelist(wc);
@@ -1469,10 +1467,12 @@ direct_write:
                wc->uncommitted_blocks++;
                wc->stats.writes_allocate++;
 bio_copy:
-               if (WC_MODE_PMEM(wc))
+               if (WC_MODE_PMEM(wc)) {
                        bio_copy_block(wc, bio, memory_data(wc, e));
-               else
-                       return writecache_bio_copy_ssd(wc, bio, e, search_used);
+               } else {
+                       writecache_bio_copy_ssd(wc, bio, e, search_used);
+                       return WC_MAP_REMAP;
+               }
        } while (bio->bi_iter.bi_size);
 
        if (unlikely(bio->bi_opf & REQ_FUA || wc->uncommitted_blocks >= wc->autocommit_blocks))