f2fs: improve print log in f2fs_sanity_check_ckpt()

As Park Ju Hyung suggested:

"I'd like to suggest to write down an actual version of f2fs-tools
here as we've seen older versions of fsck doing even more damage
and the users might not have the latest f2fs-tools installed."

This patch give a more detailed info of how we fix such corruption
to user to avoid damageable repair with low version fsck.

Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 1d33ca1a8c09e6d8b413349b0c0455e9a5747f26..d95a681ef7c972a344c5afdc5ac20d0fc4ff52aa 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2688,7 +2688,9 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
 
        if (__is_set_ckpt_flags(ckpt, CP_LARGE_NAT_BITMAP_FLAG) &&
                le32_to_cpu(ckpt->checksum_offset) != CP_MIN_CHKSUM_OFFSET) {
-               f2fs_warn(sbi, "layout of large_nat_bitmap is deprecated, run fsck to repair, chksum_offset: %u",
+               f2fs_warn(sbi, "using deprecated layout of large_nat_bitmap, "
+                         "please run fsck v1.13.0 or higher to repair, chksum_offset: %u, "
+                         "fixed with patch: \"f2fs-tools: relocate chksum_offset for large_nat_bitmap feature\"",
                          le32_to_cpu(ckpt->checksum_offset));
                return 1;
        }