[PATCH 2/7] btrfs-progs: check/original: Add inode mode check

[Qu Wenruo <wqu@suse.com>]

Just like lowmem mode, check inode mode, specially for S_IFMT bits and
beyond.

Please note that, this check only applies to inodes in fs/subvol trees.
It doesn't apply to free space cache inodes.

Reported-by: Thorsten Hirsch <t.hirsch@web.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 check/main.c          | 5 +++++
 check/mode-original.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/check/main.c b/check/main.c
index 7547209c5604..553c93caa2c9 100644
--- a/check/main.c
+++ b/check/main.c
@@ -616,6 +616,9 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
 		fprintf(stderr, ", odd inode flags");
 	if (errors & I_ERR_INLINE_RAM_BYTES_WRONG)
 		fprintf(stderr, ", invalid inline ram bytes");
+	if (errors & I_ERR_INVALID_IMODE)
+		fprintf(stderr, ", invalid inode mode bit 0%o",
+			rec->imode & ~07777);
 	fprintf(stderr, "\n");
 	/* Print the orphan extents if needed */
 	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
@@ -811,6 +814,8 @@ static void maybe_free_inode_rec(struct cache_tree *inode_cache,
 	if (!rec->checked || rec->merging)
 		return;
 
+	if (!is_valid_imode(rec->imode))
+		rec->errors |= I_ERR_INVALID_IMODE;
 	if (S_ISDIR(rec->imode)) {
 		if (rec->found_size != rec->isize)
 			rec->errors |= I_ERR_DIR_ISIZE_WRONG;
diff --git a/check/mode-original.h b/check/mode-original.h
index 25ca274118a7..e40a12930a6f 100644
--- a/check/mode-original.h
+++ b/check/mode-original.h
@@ -189,6 +189,7 @@ struct file_extent_hole {
 #define I_ERR_ODD_INODE_FLAGS		(1 << 16)
 #define I_ERR_INLINE_RAM_BYTES_WRONG	(1 << 17)
 #define I_ERR_MISMATCH_DIR_HASH		(1 << 18)
+#define I_ERR_INVALID_IMODE		(1 << 19)
 
 struct inode_record {
 	struct list_head backrefs;
-- 
2.21.0