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From:   Zhiguo Niu <zhiguo.niu@unisoc.com>
To:     <jaegeuk@kernel.org>, <chao@kernel.org>
CC:     <linux-f2fs-devel@lists.sourceforge.net>,
        <linux-kernel@vger.kernel.org>, <niuzhiguo84@gmail.com>,
        <zhiguo.niu@unisoc.com>
Subject: [PATCH V2] f2fs: fix error path of __f2fs_build_free_nids
Date:   Mon, 16 Oct 2023 19:27:31 +0800
Message-ID: <1697455651-11124-1-git-send-email-zhiguo.niu@unisoc.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

If NAT is corrupted, let scan_nat_page() return EFSCORRUPTED, so that,
caller can set SBI_NEED_FSCK flag into checkpoint for later repair by
fsck.

Also, this patch introduces a new fscorrupted error flag, and in above
scenario, it will persist the error flag into superblock synchronously
to avoid it has no luck to trigger a checkpoint to record SBI_NEED_FSCK

Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
---
changes of v2: Improve the patch according to Chao's suggestions.
---
---
 fs/f2fs/node.c          | 11 +++++++++--
 include/linux/f2fs_fs.h |  1 +
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index ee2e1dd..248764b 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2389,7 +2389,7 @@ static int scan_nat_page(struct f2fs_sb_info *sbi,
 		blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
 
 		if (blk_addr == NEW_ADDR)
-			return -EINVAL;
+			return -EFSCORRUPTED;
 
 		if (blk_addr == NULL_ADDR) {
 			add_free_nid(sbi, start_nid, true, true);
@@ -2504,7 +2504,14 @@ static int __f2fs_build_free_nids(struct f2fs_sb_info *sbi,
 
 			if (ret) {
 				f2fs_up_read(&nm_i->nat_tree_lock);
-				f2fs_err(sbi, "NAT is corrupt, run fsck to fix it");
+
+				if (ret == -EFSCORRUPTED) {
+					f2fs_err(sbi, "NAT is corrupt, run fsck to fix it");
+					set_sbi_flag(sbi, SBI_NEED_FSCK);
+					f2fs_handle_error(sbi,
+						ERROR_INCONSISTENT_NAT);
+				}
+
 				return ret;
 			}
 		}
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index a82a4bb..cf1adce 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -104,6 +104,7 @@ enum f2fs_error {
 	ERROR_CORRUPTED_VERITY_XATTR,
 	ERROR_CORRUPTED_XATTR,
 	ERROR_INVALID_NODE_REFERENCE,
+	ERROR_INCONSISTENT_NAT,
 	ERROR_MAX,
 };
 
-- 
1.9.1