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Date: Fri, 9 Mar 2007 13:55:06 +0200 (EET)
From: Pekka J Enberg <penberg@...helsinki.fi>
To: akpm@...ux-foundation.org
cc: alan@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH] revoke: consolidate revoked file operations
From: Pekka Enberg <penberg@...helsinki.fi>
Return EBADF for all revoked file operations except for read(2) which
returns zero for special files as the BSDs do and close(2) which is
always zero.
Cc: Alan Cox <alan@...hat.com>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
fs/revoked_inode.c | 367 +++++------------------------------------------------
1 file changed, 38 insertions(+), 329 deletions(-)
Index: uml-2.6/fs/revoked_inode.c
===================================================================
--- uml-2.6.orig/fs/revoked_inode.c 2007-03-09 13:26:30.000000000 +0200
+++ uml-2.6/fs/revoked_inode.c 2007-03-09 13:47:54.000000000 +0200
@@ -29,6 +29,12 @@
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)
{
@@ -200,6 +206,35 @@
.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,
+ .sendfile = revoked_file_sendfile,
+ .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)
{
@@ -326,330 +361,6 @@
/* truncate_range returns void */
};
-static loff_t revoked_special_file_llseek(struct file *file, loff_t offset,
- int origin)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_file_read(struct file *filp, char __user * buf,
- size_t size, loff_t * ppos)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_file_write(struct file *filp,
- const char __user * buf, size_t siz,
- loff_t * ppos)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_file_aio_read(struct kiocb *iocb,
- const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_file_aio_write(struct kiocb *iocb,
- const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_readdir(struct file *filp, void *dirent,
- filldir_t filldir)
-{
- return -ENXIO;
-}
-
-static unsigned int revoked_special_file_poll(struct file *filp,
- poll_table * wait)
-{
- return POLLERR;
-}
-
-static int revoked_special_file_ioctl(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
-{
- return -ENXIO;
-}
-
-static long revoked_special_file_unlocked_ioctl(struct file *file, unsigned cmd,
- unsigned long arg)
-{
- return -ENXIO;
-}
-
-static long revoked_special_file_compat_ioctl(struct file *file,
- unsigned int cmd,
- unsigned long arg)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_mmap(struct file *file,
- struct vm_area_struct *vma)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_open(struct inode *inode, struct file *filp)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_flush(struct file *file, fl_owner_t id)
-{
- return 0;
-}
-
-static int revoked_special_file_release(struct inode *inode, struct file *filp)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_fsync(struct file *file, struct dentry *dentry,
- int datasync)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_aio_fsync(struct kiocb *iocb, int datasync)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_fasync(int fd, struct file *filp, int on)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_lock(struct file *file, int cmd,
- struct file_lock *fl)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_file_sendfile(struct file *in_file,
- loff_t * ppos, size_t count,
- read_actor_t actor, void *target)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_file_sendpage(struct file *file,
- struct page *page, int off,
- size_t len, loff_t * pos, int more)
-{
- return -ENXIO;
-}
-
-static unsigned long revoked_special_file_get_unmapped_area(struct file *file,
- unsigned long addr,
- unsigned long len,
- unsigned long pgoff,
- unsigned long flags)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_check_flags(int flags)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_dir_notify(struct file *file, unsigned long arg)
-{
- return -ENXIO;
-}
-
-static int revoked_special_file_flock(struct file *filp, int cmd,
- struct file_lock *fl)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_file_splice_write(struct pipe_inode_info *pipe,
- struct file *out,
- loff_t * ppos, size_t len,
- unsigned int flags)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_file_splice_read(struct file *in, loff_t * ppos,
- struct pipe_inode_info *pipe,
- size_t len, unsigned int flags)
-{
- return -ENXIO;
-}
-
-static const struct file_operations revoked_special_file_ops = {
- .llseek = revoked_special_file_llseek,
- .read = revoked_special_file_read,
- .write = revoked_special_file_write,
- .aio_read = revoked_special_file_aio_read,
- .aio_write = revoked_special_file_aio_write,
- .readdir = revoked_special_file_readdir,
- .poll = revoked_special_file_poll,
- .ioctl = revoked_special_file_ioctl,
- .unlocked_ioctl = revoked_special_file_unlocked_ioctl,
- .compat_ioctl = revoked_special_file_compat_ioctl,
- .mmap = revoked_special_file_mmap,
- .open = revoked_special_file_open,
- .flush = revoked_special_file_flush,
- .release = revoked_special_file_release,
- .fsync = revoked_special_file_fsync,
- .aio_fsync = revoked_special_file_aio_fsync,
- .fasync = revoked_special_file_fasync,
- .lock = revoked_special_file_lock,
- .sendfile = revoked_special_file_sendfile,
- .sendpage = revoked_special_file_sendpage,
- .get_unmapped_area = revoked_special_file_get_unmapped_area,
- .check_flags = revoked_special_file_check_flags,
- .dir_notify = revoked_special_file_dir_notify,
- .flock = revoked_special_file_flock,
- .splice_write = revoked_special_file_splice_write,
- .splice_read = revoked_special_file_splice_read,
-};
-
-static int revoked_special_inode_create(struct inode *dir,
- struct dentry *dentry, int mode,
- struct nameidata *nd)
-{
- return -ENXIO;
-}
-
-static struct dentry *revoked_special_inode_lookup(struct inode *dir,
- struct dentry *dentry,
- struct nameidata *nd)
-{
- return ERR_PTR(-ENXIO);
-}
-
-static int revoked_special_inode_link(struct dentry *old_dentry,
- struct inode *dir, struct dentry *dentry)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_unlink(struct inode *dir,
- struct dentry *dentry)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_symlink(struct inode *dir,
- struct dentry *dentry,
- const char *symname)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_mkdir(struct inode *dir, struct dentry *dentry,
- int mode)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_rmdir(struct inode *dir, struct dentry *dentry)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_mknod(struct inode *dir, struct dentry *dentry,
- int mode, dev_t rdev)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_rename(struct inode *old_dir,
- struct dentry *old_dentry,
- struct inode *new_dir,
- struct dentry *new_dentry)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_readlink(struct dentry *dentry,
- char __user * buffer, int buflen)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_permission(struct inode *inode, int mask,
- struct nameidata *nd)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_getattr(struct vfsmount *mnt,
- struct dentry *dentry,
- struct kstat *stat)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_setattr(struct dentry *direntry,
- struct iattr *attrs)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_setxattr(struct dentry *dentry,
- const char *name, const void *value,
- size_t size, int flags)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_inode_getxattr(struct dentry *dentry,
- const char *name, void *buffer,
- size_t size)
-{
- return -ENXIO;
-}
-
-static ssize_t revoked_special_inode_listxattr(struct dentry *dentry,
- char *buffer, size_t buffer_size)
-{
- return -ENXIO;
-}
-
-static int revoked_special_inode_removexattr(struct dentry *dentry,
- const char *name)
-{
- return -ENXIO;
-}
-
-static struct inode_operations revoked_special_inode_ops = {
- .create = revoked_special_inode_create,
- .lookup = revoked_special_inode_lookup,
- .link = revoked_special_inode_link,
- .unlink = revoked_special_inode_unlink,
- .symlink = revoked_special_inode_symlink,
- .mkdir = revoked_special_inode_mkdir,
- .rmdir = revoked_special_inode_rmdir,
- .mknod = revoked_special_inode_mknod,
- .rename = revoked_special_inode_rename,
- .readlink = revoked_special_inode_readlink,
- /* follow_link must be no-op, otherwise unmounting this inode
- won't work */
- /* put_link returns void */
- /* truncate returns void */
- .permission = revoked_special_inode_permission,
- .getattr = revoked_special_inode_getattr,
- .setattr = revoked_special_inode_setattr,
- .setxattr = revoked_special_inode_setxattr,
- .getxattr = revoked_special_inode_getxattr,
- .listxattr = revoked_special_inode_listxattr,
- .removexattr = revoked_special_inode_removexattr,
- /* truncate_range returns void */
-};
-
void make_revoked_inode(struct inode *inode, int mode)
{
remove_inode_hash(inode);
@@ -657,12 +368,10 @@
inode->i_mode = mode;
inode->i_atime = inode->i_mtime = inode->i_ctime =
current_fs_time(inode->i_sb);
+ inode->i_op = &revoked_inode_ops;
- if (special_file(mode)) {
- inode->i_op = &revoked_special_inode_ops;
+ if (special_file(mode))
inode->i_fop = &revoked_special_file_ops;
- } else {
- inode->i_op = &revoked_inode_ops;
+ else
inode->i_fop = &revoked_file_ops;
- }
}
-
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