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>

1 files changed, 15 insertions, 2 deletions

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 6a81b73add06..f3ebfb5a8431 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;