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-rw-r--r--fs/befs/inode.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/fs/befs/inode.c b/fs/befs/inode.c
new file mode 100644
index 000000000000..d41c9247ae8a
--- /dev/null
+++ b/fs/befs/inode.c
@@ -0,0 +1,53 @@
+/*
+ * inode.c
+ *
+ * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
+ */
+
+#include <linux/fs.h>
+
+#include "befs.h"
+#include "inode.h"
+#include "endian.h"
+
+/*
+ Validates the correctness of the befs inode
+ Returns BEFS_OK if the inode should be used, otherwise
+ returns BEFS_BAD_INODE
+*/
+int
+befs_check_inode(struct super_block *sb, befs_inode * raw_inode,
+ befs_blocknr_t inode)
+{
+ u32 magic1 = fs32_to_cpu(sb, raw_inode->magic1);
+ befs_inode_addr ino_num = fsrun_to_cpu(sb, raw_inode->inode_num);
+ u32 flags = fs32_to_cpu(sb, raw_inode->flags);
+
+ /* check magic header. */
+ if (magic1 != BEFS_INODE_MAGIC1) {
+ befs_error(sb,
+ "Inode has a bad magic header - inode = %lu", inode);
+ return BEFS_BAD_INODE;
+ }
+
+ /*
+ * Sanity check2: inodes store their own block address. Check it.
+ */
+ if (inode != iaddr2blockno(sb, &ino_num)) {
+ befs_error(sb, "inode blocknr field disagrees with vfs "
+ "VFS: %lu, Inode %lu",
+ inode, iaddr2blockno(sb, &ino_num));
+ return BEFS_BAD_INODE;
+ }
+
+ /*
+ * check flag
+ */
+
+ if (!(flags & BEFS_INODE_IN_USE)) {
+ befs_error(sb, "inode is not used - inode = %lu", inode);
+ return BEFS_BAD_INODE;
+ }
+
+ return BEFS_OK;
+}