patch-2.1.56 linux/fs/bad_inode.c

• Lines: 84
• Date: Wed Sep 17 12:06:43 1997
• Orig file: v2.1.55/linux/fs/bad_inode.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.55/linux/fs/bad_inode.c linux/fs/bad_inode.c
@@ -0,0 +1,83 @@
+/*
+ *  linux/fs/bad_inode.c
+ *
+ *  Copyright (C) 1997, Stephen Tweedie
+ *
+ *  Provide stub functions for unreadable inodes
+ */
+
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/sched.h>
+
+/*
+ * The follow_symlink operation must dput() the base.
+ */
+static struct dentry * bad_follow_link(struct inode * ino, struct dentry *base)
+{
+	dput(base);
+	return ERR_PTR(-EIO);
+}
+
+static int return_EIO()
+{
+	return -EIO;
+}
+
+#define EIO_ERROR ((void *) (return_EIO))
+
+static struct file_operations bad_file_ops =
+{
+	EIO_ERROR,		/* lseek */
+	EIO_ERROR,		/* read */
+	EIO_ERROR,		/* write */
+	EIO_ERROR,		/* readdir */
+	EIO_ERROR,		/* select */
+	EIO_ERROR,		/* ioctl */
+	EIO_ERROR,		/* mmap */
+	EIO_ERROR,		/* open */
+	EIO_ERROR,		/* release */
+	EIO_ERROR,		/* fsync */
+	EIO_ERROR,		/* fasync */
+	EIO_ERROR,		/* check_media_change */
+	EIO_ERROR		/* revalidate */
+};
+
+struct inode_operations bad_inode_ops =
+{
+	&bad_file_ops,		/* default file operations */
+	EIO_ERROR,		/* 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 */
+	bad_follow_link,	/* follow_link */
+	EIO_ERROR,		/* readpage */
+	EIO_ERROR,		/* writepage */
+	EIO_ERROR,		/* bmap */
+	EIO_ERROR,		/* truncate */
+	EIO_ERROR,		/* permission */
+	EIO_ERROR		/* smap */
+};
+
+
+/* 
+ * 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.
+ */
+void make_bad_inode(struct inode * inode) 
+{
+	inode->i_mode = S_IFREG;
+	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	inode->i_op = &bad_inode_ops;	
+}
+