Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Chao Yu <chao@kernel.org>,
        Jaegeuk Kim <jaegeuk@kernel.org>
Subject: [PATCH 5.15 782/846] f2fs: fix to check available space of CP area correctly in update_ckpt_flags()
Date:   Mon, 24 Jan 2022 19:44:59 +0100
Message-Id: <20220124184127.931729694@linuxfoundation.org>
In-Reply-To: <20220124184100.867127425@linuxfoundation.org>
References: <20220124184100.867127425@linuxfoundation.org>
User-Agent: quilt/0.66
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Chao Yu <chao@kernel.org>

commit b702c83e2eaa2fa2d72e957c55c0321535cc8b9f upstream.

Otherwise, nat_bit area may be persisted across boundary of CP area during
nat_bit rebuilding.

Fixes: 94c821fb286b ("f2fs: rebuild nat_bits during umount")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/f2fs/checkpoint.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1305,8 +1305,8 @@ static void update_ckpt_flags(struct f2f
 	unsigned long flags;
 
 	if (cpc->reason & CP_UMOUNT) {
-		if (le32_to_cpu(ckpt->cp_pack_total_block_count) >
-			sbi->blocks_per_seg - NM_I(sbi)->nat_bits_blocks) {
+		if (le32_to_cpu(ckpt->cp_pack_total_block_count) +
+			NM_I(sbi)->nat_bits_blocks > sbi->blocks_per_seg) {
 			clear_ckpt_flags(sbi, CP_NAT_BITS_FLAG);
 			f2fs_notice(sbi, "Disable nat_bits due to no space");
 		} else if (!is_set_ckpt_flags(sbi, CP_NAT_BITS_FLAG) &&