[PATCH v2 3/3] f2fs: introduce FAULT_INCONSISTENT_FOOTER

[Chao Yu]

To simulate inconsistent node footer error.

Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
---
v2:
- no changes
 Documentation/ABI/testing/sysfs-fs-f2fs | 1 +
 Documentation/filesystems/f2fs.rst      | 1 +
 fs/f2fs/f2fs.h                          | 1 +
 fs/f2fs/node.c                          | 3 ++-
 fs/f2fs/super.c                         | 1 +
 5 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 81deae2af84d..b9a000e5098a 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -734,6 +734,7 @@ Description:	Support configuring fault injection type, should be
 		FAULT_BLKADDR_VALIDITY           0x000040000
 		FAULT_BLKADDR_CONSISTENCE        0x000080000
 		FAULT_NO_SEGMENT                 0x000100000
+		FAULT_INCONSISTENT_FOOTER        0x000200000
 		===========================      ===========
 
 What:		/sys/fs/f2fs/<disk>/discard_io_aware_gran
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index fb7d2ee022bc..42f28dbf2410 100644
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -206,6 +206,7 @@ fault_type=%d		 Support configuring fault injection type, should be
 			 FAULT_BLKADDR_VALIDITY           0x000040000
 			 FAULT_BLKADDR_CONSISTENCE        0x000080000
 			 FAULT_NO_SEGMENT                 0x000100000
+			 FAULT_INCONSISTENT_FOOTER        0x000200000
 			 ===========================      ===========
 mode=%s			 Control block allocation mode which supports "adaptive"
 			 and "lfs". In "lfs" mode, there should be no random
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index b43aaa9e4ae5..6b4579b05dbf 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -62,6 +62,7 @@ enum {
 	FAULT_BLKADDR_VALIDITY,
 	FAULT_BLKADDR_CONSISTENCE,
 	FAULT_NO_SEGMENT,
+	FAULT_INCONSISTENT_FOOTER,
 	FAULT_MAX,
 };
 
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 439690f40d2b..c40980447113 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1463,7 +1463,8 @@ static int sanity_check_node_footer(struct f2fs_sb_info *sbi,
 	if (unlikely(nid != nid_of_node(page) ||
 		(ntype == NODE_TYPE_INODE && !IS_INODE(page)) ||
 		(ntype == NODE_TYPE_XATTR &&
-		!f2fs_has_xattr_block(ofs_of_node(page))))) {
+		!f2fs_has_xattr_block(ofs_of_node(page))) ||
+		time_to_inject(sbi, FAULT_INCONSISTENT_FOOTER))) {
 		f2fs_warn(sbi, "inconsistent node block, node_type:%d, nid:%lu, "
 			  "node_footer[nid:%u,ino:%u,ofs:%u,cpver:%llu,blkaddr:%u]",
 			  ntype, nid, nid_of_node(page), ino_of_node(page),
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 3c875dc07266..bbd45e300311 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -63,6 +63,7 @@ const char *f2fs_fault_name[FAULT_MAX] = {
 	[FAULT_BLKADDR_VALIDITY]	= "invalid blkaddr",
 	[FAULT_BLKADDR_CONSISTENCE]	= "inconsistent blkaddr",
 	[FAULT_NO_SEGMENT]		= "no free segment",
+	[FAULT_INCONSISTENT_FOOTER]	= "inconsistent footer",
 };
 
 int f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned long rate,
-- 
2.48.1