From 13da549460d549aec78a943e589f4ffc3fdc716c Mon Sep 17 00:00:00 2001
From: Chao Yu <chao2.yu@samsung.com>
Date: Mon, 8 Dec 2014 14:56:19 +0800
Subject: f2fs: fix to enable readahead for SSA/CP blocks

1.We use zero as upper boundary value for ra SSA/CP blocks, we will skip
readahead as verification failure with max number, it causes low performance.
2.Low boundary value is not accurate for SSA/CP/POR region verification, so
these values need to be redefined.

This patch fixes above issues.

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

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 6a81b73..f3ebfb5 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -95,8 +95,9 @@ static inline block_t get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
 	case META_SIT:
 		return SIT_BLK_CNT(sbi);
 	case META_SSA:
+		return MAIN_BLKADDR(sbi);
 	case META_CP:
-		return 0;
+		return SM_I(sbi)->sit_info->sit_base_addr;
 	case META_POR:
 		return MAX_BLKADDR(sbi);
 	default:
@@ -141,11 +142,23 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, int type
 			prev_blk_addr = blk_addr;
 			break;
 		case META_SSA:
+			if (unlikely(blkno >= max_blks))
+				goto out;
+			if (unlikely(blkno < SM_I(sbi)->ssa_blkaddr))
+				goto out;
+			blk_addr = blkno;
+			break;
 		case META_CP:
+			if (unlikely(blkno >= max_blks))
+				goto out;
+			if (unlikely(blkno < __start_cp_addr(sbi)))
+				goto out;
+			blk_addr = blkno;
+			break;
 		case META_POR:
 			if (unlikely(blkno >= max_blks))
 				goto out;
-			if (unlikely(blkno < SEG0_BLKADDR(sbi)))
+			if (unlikely(blkno < MAIN_BLKADDR(sbi)))
 				goto out;
 			blk_addr = blkno;
 			break;
-- 
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