1 files changed, 123 insertions, 0 deletions

diff --git a/fs/bad_inode.c b/fs/bad_inode.c
new file mode 100644
index 000000000000..672a31924f3c
--- /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);