1 files changed, 123 insertions, 0 deletions
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
new file mode 100644
index 0000000..672a319
--- /dev/null
+++ b/fs/bad_inode.c
@@ -0,0 +1,123 @@
+/*
+ *  linux/fs/bad_inode.c
+ *
+ *  Copyright (C) 1997, Stephen Tweedie
+ *
+ *  Provide stub functions for unreadable inodes
+ *
+ *  Fabian Frederick : August 2003 - All file operations assigned to EIO
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/smp_lock.h>
+#include <linux/namei.h>
+
+static int return_EIO(void)
+{
+	return -EIO;
+}
+
+#define EIO_ERROR ((void *) (return_EIO))
+
+static struct file_operations bad_file_ops =
+{
+	.llseek		= EIO_ERROR,
+	.aio_read	= EIO_ERROR,
+	.read		= EIO_ERROR,
+	.write		= EIO_ERROR,
+	.aio_write	= EIO_ERROR,
+	.readdir	= EIO_ERROR,
+	.poll		= EIO_ERROR,
+	.ioctl		= EIO_ERROR,
+	.mmap		= EIO_ERROR,
+	.open		= EIO_ERROR,
+	.flush		= EIO_ERROR,
+	.release	= EIO_ERROR,
+	.fsync		= EIO_ERROR,
+	.aio_fsync	= EIO_ERROR,
+	.fasync		= EIO_ERROR,
+	.lock		= EIO_ERROR,
+	.readv		= EIO_ERROR,
+	.writev		= EIO_ERROR,
+	.sendfile	= EIO_ERROR,
+	.sendpage	= EIO_ERROR,
+	.get_unmapped_area = EIO_ERROR,
+};
+
+struct inode_operations bad_inode_ops =
+{
+	.create		= EIO_ERROR,
+	.lookup		= EIO_ERROR,
+	.link		= EIO_ERROR,
+	.unlink		= EIO_ERROR,
+	.symlink	= EIO_ERROR,
+	.mkdir		= EIO_ERROR,
+	.rmdir		= EIO_ERROR,
+	.mknod		= EIO_ERROR,
+	.rename		= EIO_ERROR,
+	.readlink	= EIO_ERROR,
+	/* follow_link must be no-op, otherwise unmounting this inode
+	   won't work */
+	.truncate	= EIO_ERROR,
+	.permission	= EIO_ERROR,
+	.getattr	= EIO_ERROR,
+	.setattr	= EIO_ERROR,
+	.setxattr	= EIO_ERROR,
+	.getxattr	= EIO_ERROR,
+	.listxattr	= EIO_ERROR,
+	.removexattr	= EIO_ERROR,
+};
+
+
+/*
+ * When a filesystem is unable to read an inode due to an I/O error in
+ * its read_inode() function, it can call make_bad_inode() to return a
+ * set of stubs which will return EIO errors as required. 
+ *
+ * We only need to do limited initialisation: all other fields are
+ * preinitialised to zero automatically.
+ */
+ 
+/**
+ *	make_bad_inode - mark an inode bad due to an I/O error
+ *	@inode: Inode to mark bad
+ *
+ *	When an inode cannot be read due to a media or remote network
+ *	failure this function makes the inode "bad" and causes I/O operations
+ *	on it to fail from this point on.
+ */
+ 
+void make_bad_inode(struct inode * inode) 
+{
+	remove_inode_hash(inode);
+
+	inode->i_mode = S_IFREG;
+	inode->i_atime = inode->i_mtime = inode->i_ctime =
+		current_fs_time(inode->i_sb);
+	inode->i_op = &bad_inode_ops;	
+	inode->i_fop = &bad_file_ops;	
+}
+EXPORT_SYMBOL(make_bad_inode);
+
+/*
+ * This tests whether an inode has been flagged as bad. The test uses
+ * &bad_inode_ops to cover the case of invalidated inodes as well as
+ * those created by make_bad_inode() above.
+ */
+ 
+/**
+ *	is_bad_inode - is an inode errored
+ *	@inode: inode to test
+ *
+ *	Returns true if the inode in question has been marked as bad.
+ */
+ 
+int is_bad_inode(struct inode * inode) 
+{
+	return (inode->i_op == &bad_inode_ops);	
+}
+
+EXPORT_SYMBOL(is_bad_inode);