f2fs: readahead contiguous SSA blocks for f2fs_gc

If there are multi segments in one section, we will read those SSA blocks which
have contiguous address one by one in f2fs_gc. It may lost performance, let's
read ahead SSA blocks by merge multi read request.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 6f88191f2a34..bd6666e1bf2f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -89,12 +89,13 @@ enum {
 };
 
 /*
- * For CP/NAT/SIT readahead
+ * For CP/NAT/SIT/SSA readahead
  */
 enum {
         META_CP,
         META_NAT,
-        META_SIT
+        META_SIT,
+        META_SSA
 };
 
 /* for the list of orphan inodes */