linux-kernel - [PATCH v5 3/3] f2fs: detect more inconsistent cases in sanity_check_node

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Message-Id: <20260112074917.40107-3-chao@kernel.org>
Date: Mon, 12 Jan 2026 15:49:17 +0800
From: Chao Yu <chao@...nel.org>
To: jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Chao Yu <chao@...nel.org>
Subject: [PATCH v5 3/3] f2fs: detect more inconsistent cases in sanity_check_node_footer()

Let's enhance sanity_check_node_footer() to detect more inconsistent
cases as below:

Node Type			Node Footer Info
===================		=============================
NODE_TYPE_REGULAR		inode = true and xnode = true
NODE_TYPE_INODE			inode = false or xnode = true
NODE_TYPE_XATTR			inode = true or xnode = false
NODE_TYPE_NON_INODE		inode = false

Signed-off-by: Chao Yu <chao@...nel.org>
---
v5:
- split original patch 1/2 to two, in this patch, fix to not sanity check
on uninitialized i_mode for new inode page, instead, let's enhance
sanity_check_node_footer() to detect more inconsistent cases in node footer.
 fs/f2fs/node.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index e8b2618fcac7..c79af2bc5728 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1515,20 +1515,29 @@ int f2fs_sanity_check_node_footer(struct f2fs_sb_info *sbi,
 					struct folio *folio, pgoff_t nid,
 					enum node_type ntype, bool in_irq)
 {
+	bool is_inode, is_xnode;
+
 	if (unlikely(nid != nid_of_node(folio)))
 		goto out_err;
 
+	is_inode = IS_INODE(folio);
+	is_xnode = f2fs_has_xattr_block(ofs_of_node(folio));
+
 	switch (ntype) {
+	case NODE_TYPE_REGULAR:
+		if (is_inode && is_xnode)
+			goto out_err;
+		break;
 	case NODE_TYPE_INODE:
-		if (!IS_INODE(folio))
+		if (!is_inode || is_xnode)
 			goto out_err;
 		break;
 	case NODE_TYPE_XATTR:
-		if (!f2fs_has_xattr_block(ofs_of_node(folio)))
+		if (is_inode || !is_xnode)
 			goto out_err;
 		break;
 	case NODE_TYPE_NON_INODE:
-		if (IS_INODE(folio))
+		if (is_inode)
 			goto out_err;
 		break;
 	default:
-- 
2.40.1