From: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Add file, inode, and addresspace operations for inodes that represent revoked
files.
Cc: Alan Cox <alan@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
---
fs/revoked_inode.c | 416 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 416 insertions(+)
Index: 2.6/fs/revoked_inode.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ 2.6/fs/revoked_inode.c 2007-12-14 16:40:53.000000000 +0200
@@ -0,0 +1,416 @@
+/*
+ * fs/revoked_inode.c
+ *
+ * Copyright (C) 2007 Pekka Enberg
+ *
+ * Provide stub functions for revoked inodes. Based on fs/bad_inode.c which is
+ *
+ * Copyright (C) 1997 Stephen Tweedie
+ *
+ * This file is released under the GPLv2.
+ */
+
+#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>
+#include <linux/poll.h>
+
+static loff_t revoked_file_llseek(struct file *file, loff_t offset, int origin)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_file_read(struct file *filp, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_special_file_read(struct file *filp, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ return 0;
+}
+
+static ssize_t revoked_file_write(struct file *filp, const char __user *buf,
+ size_t siz, loff_t *ppos)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_file_aio_read(struct kiocb *iocb,
+ const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_file_aio_write(struct kiocb *iocb,
+ const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ return -EBADF;
+}
+
+static int revoked_file_readdir(struct file *filp, void *dirent,
+ filldir_t filldir)
+{
+ return -EBADF;
+}
+
+static unsigned int revoked_file_poll(struct file *filp, poll_table *wait)
+{
+ return POLLERR;
+}
+
+static int revoked_file_ioctl(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ return -EBADF;
+}
+
+static long revoked_file_unlocked_ioctl(struct file *file, unsigned cmd,
+ unsigned long arg)
+{
+ return -EBADF;
+}
+
+static long revoked_file_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return -EBADF;
+}
+
+static int revoked_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ return -EBADF;
+}
+
+static int revoked_file_open(struct inode *inode, struct file *filp)
+{
+ return -EBADF;
+}
+
+static int revoked_file_flush(struct file *file, fl_owner_t id)
+{
+ return 0;
+}
+
+static int revoked_file_release(struct inode *inode, struct file *filp)
+{
+ return -EBADF;
+}
+
+static int revoked_file_fsync(struct file *file, struct dentry *dentry,
+ int datasync)
+{
+ return -EBADF;
+}
+
+static int revoked_file_aio_fsync(struct kiocb *iocb, int datasync)
+{
+ return -EBADF;
+}
+
+static int revoked_file_fasync(int fd, struct file *filp, int on)
+{
+ return -EBADF;
+}
+
+static int revoked_file_lock(struct file *file, int cmd, struct file_lock *fl)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_file_sendpage(struct file *file, struct page *page,
+ int off, size_t len, loff_t *pos,
+ int more)
+{
+ return -EBADF;
+}
+
+static unsigned long revoked_file_get_unmapped_area(struct file *file,
+ unsigned long addr,
+ unsigned long len,
+ unsigned long pgoff,
+ unsigned long flags)
+{
+ return -EBADF;
+}
+
+static int revoked_file_check_flags(int flags)
+{
+ return -EBADF;
+}
+
+static int revoked_file_dir_notify(struct file *file, unsigned long arg)
+{
+ return -EBADF;
+}
+
+static int revoked_file_flock(struct file *filp, int cmd, struct file_lock *fl)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_file_splice_write(struct pipe_inode_info *pipe,
+ struct file *out, loff_t *ppos,
+ size_t len, unsigned int flags)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_file_splice_read(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe,
+ size_t len, unsigned int flags)
+{
+ return -EBADF;
+}
+
+static const struct file_operations revoked_file_ops = {
+ .llseek = revoked_file_llseek,
+ .read = revoked_file_read,
+ .write = revoked_file_write,
+ .aio_read = revoked_file_aio_read,
+ .aio_write = revoked_file_aio_write,
+ .readdir = revoked_file_readdir,
+ .poll = revoked_file_poll,
+ .ioctl = revoked_file_ioctl,
+ .unlocked_ioctl = revoked_file_unlocked_ioctl,
+ .compat_ioctl = revoked_file_compat_ioctl,
+ .mmap = revoked_file_mmap,
+ .open = revoked_file_open,
+ .flush = revoked_file_flush,
+ .release = revoked_file_release,
+ .fsync = revoked_file_fsync,
+ .aio_fsync = revoked_file_aio_fsync,
+ .fasync = revoked_file_fasync,
+ .lock = revoked_file_lock,
+ .sendpage = revoked_file_sendpage,
+ .get_unmapped_area = revoked_file_get_unmapped_area,
+ .check_flags = revoked_file_check_flags,
+ .dir_notify = revoked_file_dir_notify,
+ .flock = revoked_file_flock,
+ .splice_write = revoked_file_splice_write,
+ .splice_read = revoked_file_splice_read,
+};
+
+static const struct file_operations revoked_special_file_ops = {
+ .llseek = revoked_file_llseek,
+ .read = revoked_special_file_read,
+ .write = revoked_file_write,
+ .aio_read = revoked_file_aio_read,
+ .aio_write = revoked_file_aio_write,
+ .readdir = revoked_file_readdir,
+ .poll = revoked_file_poll,
+ .ioctl = revoked_file_ioctl,
+ .unlocked_ioctl = revoked_file_unlocked_ioctl,
+ .compat_ioctl = revoked_file_compat_ioctl,
+ .mmap = revoked_file_mmap,
+ .open = revoked_file_open,
+ .flush = revoked_file_flush,
+ .release = revoked_file_release,
+ .fsync = revoked_file_fsync,
+ .aio_fsync = revoked_file_aio_fsync,
+ .fasync = revoked_file_fasync,
+ .lock = revoked_file_lock,
+ .sendpage = revoked_file_sendpage,
+ .get_unmapped_area = revoked_file_get_unmapped_area,
+ .check_flags = revoked_file_check_flags,
+ .dir_notify = revoked_file_dir_notify,
+ .flock = revoked_file_flock,
+ .splice_write = revoked_file_splice_write,
+ .splice_read = revoked_file_splice_read,
+};
+
+static int revoked_inode_create(struct inode *dir, struct dentry *dentry,
+ int mode, struct nameidata *nd)
+{
+ return -EBADF;
+}
+
+static struct dentry *revoked_inode_lookup(struct inode *dir,
+ struct dentry *dentry,
+ struct nameidata *nd)
+{
+ return ERR_PTR(-EBADF);
+}
+
+static int revoked_inode_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_unlink(struct inode *dir, struct dentry *dentry)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_mkdir(struct inode *dir, struct dentry *dentry,
+ int mode)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t rdev)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_rename(struct inode *old_dir,
+ struct dentry *old_dentry,
+ struct inode *new_dir,
+ struct dentry *new_dentry)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_readlink(struct dentry *dentry, char __user *buffer,
+ int buflen)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_permission(struct inode *inode, int mask,
+ struct nameidata *nd)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_setattr(struct dentry *direntry, struct iattr *attrs)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_setxattr(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_inode_getxattr(struct dentry *dentry, const char *name,
+ void *buffer, size_t size)
+{
+ return -EBADF;
+}
+
+static ssize_t revoked_inode_listxattr(struct dentry *dentry, char *buffer,
+ size_t buffer_size)
+{
+ return -EBADF;
+}
+
+static int revoked_inode_removexattr(struct dentry *dentry, const char *name)
+{
+ return -EBADF;
+}
+
+static struct inode_operations revoked_inode_ops = {
+ .create = revoked_inode_create,
+ .lookup = revoked_inode_lookup,
+ .link = revoked_inode_link,
+ .unlink = revoked_inode_unlink,
+ .symlink = revoked_inode_symlink,
+ .mkdir = revoked_inode_mkdir,
+ .rmdir = revoked_inode_rmdir,
+ .mknod = revoked_inode_mknod,
+ .rename = revoked_inode_rename,
+ .readlink = revoked_inode_readlink,
+ /* follow_link must be no-op, otherwise unmounting this inode
+ won't work */
+ /* put_link returns void */
+ /* truncate returns void */
+ .permission = revoked_inode_permission,
+ .getattr = revoked_inode_getattr,
+ .setattr = revoked_inode_setattr,
+ .setxattr = revoked_inode_setxattr,
+ .getxattr = revoked_inode_getxattr,
+ .listxattr = revoked_inode_listxattr,
+ .removexattr = revoked_inode_removexattr,
+ /* truncate_range returns void */
+};
+
+static int revoked_readpage(struct file *file, struct page *page)
+{
+ return -EIO;
+}
+
+static int revoked_writepage(struct page *page, struct writeback_control *wbc)
+{
+ return -EIO;
+}
+
+static int revoked_prepare_write(struct file *file, struct page *page,
+ unsigned from, unsigned to)
+{
+ return -EIO;
+}
+
+static int revoked_commit_write(struct file *file, struct page *page,
+ unsigned from, unsigned to)
+{
+ return -EIO;
+}
+
+static ssize_t revoked_direct_IO(int rw, struct kiocb *iocb,
+ const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs)
+{
+ return -EIO;
+}
+
+static const struct address_space_operations revoked_aops = {
+ .readpage = revoked_readpage,
+ .writepage = revoked_writepage,
+ .prepare_write = revoked_prepare_write,
+ .commit_write = revoked_commit_write,
+ .direct_IO = revoked_direct_IO,
+};
+
+void make_revoked_file(struct inode *inode, struct file *file)
+{
+ if (special_file(inode->i_mode))
+ file->f_op = &revoked_special_file_ops;
+ else
+ file->f_op = &revoked_file_ops;
+
+ file->f_pos = 0;
+}
+
+void make_revoked_inode(struct inode *inode)
+{
+ remove_inode_hash(inode);
+
+ inode->i_atime = inode->i_mtime = inode->i_ctime =
+ current_fs_time(inode->i_sb);
+ inode->i_op = &revoked_inode_ops;
+
+ if (special_file(inode->i_mode))
+ inode->i_fop = &revoked_special_file_ops;
+ else
+ inode->i_fop = &revoked_file_ops;
+
+ inode->i_mapping->a_ops = &revoked_aops;
+}
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