v4.19.13 snapshot.
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
new file mode 100644
index 0000000..8035d2a
--- /dev/null
+++ b/fs/bad_inode.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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/export.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/namei.h>
+#include <linux/poll.h>
+
+static int bad_file_open(struct inode *inode, struct file *filp)
+{
+ return -EIO;
+}
+
+static const struct file_operations bad_file_ops =
+{
+ .open = bad_file_open,
+};
+
+static int bad_inode_create (struct inode *dir, struct dentry *dentry,
+ umode_t mode, bool excl)
+{
+ return -EIO;
+}
+
+static struct dentry *bad_inode_lookup(struct inode *dir,
+ struct dentry *dentry, unsigned int flags)
+{
+ return ERR_PTR(-EIO);
+}
+
+static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ return -EIO;
+}
+
+static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
+{
+ return -EIO;
+}
+
+static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ return -EIO;
+}
+
+static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
+ umode_t mode)
+{
+ return -EIO;
+}
+
+static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
+{
+ return -EIO;
+}
+
+static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
+ umode_t mode, dev_t rdev)
+{
+ return -EIO;
+}
+
+static int bad_inode_rename2(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags)
+{
+ return -EIO;
+}
+
+static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
+ int buflen)
+{
+ return -EIO;
+}
+
+static int bad_inode_permission(struct inode *inode, int mask)
+{
+ return -EIO;
+}
+
+static int bad_inode_getattr(const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int query_flags)
+{
+ return -EIO;
+}
+
+static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
+{
+ return -EIO;
+}
+
+static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
+ size_t buffer_size)
+{
+ return -EIO;
+}
+
+static const char *bad_inode_get_link(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ return ERR_PTR(-EIO);
+}
+
+static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
+{
+ return ERR_PTR(-EIO);
+}
+
+static int bad_inode_fiemap(struct inode *inode,
+ struct fiemap_extent_info *fieinfo, u64 start,
+ u64 len)
+{
+ return -EIO;
+}
+
+static int bad_inode_update_time(struct inode *inode, struct timespec64 *time,
+ int flags)
+{
+ return -EIO;
+}
+
+static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
+ struct file *file, unsigned int open_flag,
+ umode_t create_mode)
+{
+ return -EIO;
+}
+
+static int bad_inode_tmpfile(struct inode *inode, struct dentry *dentry,
+ umode_t mode)
+{
+ return -EIO;
+}
+
+static int bad_inode_set_acl(struct inode *inode, struct posix_acl *acl,
+ int type)
+{
+ return -EIO;
+}
+
+static const struct inode_operations bad_inode_ops =
+{
+ .create = bad_inode_create,
+ .lookup = bad_inode_lookup,
+ .link = bad_inode_link,
+ .unlink = bad_inode_unlink,
+ .symlink = bad_inode_symlink,
+ .mkdir = bad_inode_mkdir,
+ .rmdir = bad_inode_rmdir,
+ .mknod = bad_inode_mknod,
+ .rename = bad_inode_rename2,
+ .readlink = bad_inode_readlink,
+ .permission = bad_inode_permission,
+ .getattr = bad_inode_getattr,
+ .setattr = bad_inode_setattr,
+ .listxattr = bad_inode_listxattr,
+ .get_link = bad_inode_get_link,
+ .get_acl = bad_inode_get_acl,
+ .fiemap = bad_inode_fiemap,
+ .update_time = bad_inode_update_time,
+ .atomic_open = bad_inode_atomic_open,
+ .tmpfile = bad_inode_tmpfile,
+ .set_acl = bad_inode_set_acl,
+};
+
+
+/*
+ * 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_time(inode);
+ inode->i_op = &bad_inode_ops;
+ inode->i_opflags &= ~IOP_XATTR;
+ 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.
+ */
+
+bool is_bad_inode(struct inode *inode)
+{
+ return (inode->i_op == &bad_inode_ops);
+}
+
+EXPORT_SYMBOL(is_bad_inode);
+
+/**
+ * iget_failed - Mark an under-construction inode as dead and release it
+ * @inode: The inode to discard
+ *
+ * Mark an under-construction inode as dead and release it.
+ */
+void iget_failed(struct inode *inode)
+{
+ make_bad_inode(inode);
+ unlock_new_inode(inode);
+ iput(inode);
+}
+EXPORT_SYMBOL(iget_failed);