ovl: remove unneeded ioctls

The FS_IOC_[GS]ETFLAGS/FS_IOC_FS[GS]ETXATTR ioctls are now handled via the
fileattr api.  The only unconverted filesystem remaining is CIFS and it is
not allowed to be overlayed due to case insensitive filenames.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

Author: Miklos Szeredi

fs/overlayfs/file.c

@@ -491,112 +491,6 @@ static int ovl_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
 	return ret;
 }
 
-static long ovl_real_ioctl(struct file *file, unsigned int cmd,
-			   unsigned long arg)
-{
-	struct fd real;
-	long ret;
-
-	ret = ovl_real_fdget(file, &real);
-	if (ret)
-		return ret;
-
-	ret = security_file_ioctl(real.file, cmd, arg);
-	if (!ret) {
-		/*
-		 * Don't override creds, since we currently can't safely check
-		 * permissions before doing so.
-		 */
-		ret = vfs_ioctl(real.file, cmd, arg);
-	}
-
-	fdput(real);
-
-	return ret;
-}
-
-static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd,
-				unsigned long arg)
-{
-	long ret;
-	struct inode *inode = file_inode(file);
-
-	if (!inode_owner_or_capable(&init_user_ns, inode))
-		return -EACCES;
-
-	ret = mnt_want_write_file(file);
-	if (ret)
-		return ret;
-
-	inode_lock(inode);
-
-	/*
-	 * Prevent copy up if immutable and has no CAP_LINUX_IMMUTABLE
-	 * capability.
-	 */
-	ret = -EPERM;
-	if (!ovl_has_upperdata(inode) && IS_IMMUTABLE(inode) &&
-	    !capable(CAP_LINUX_IMMUTABLE))
-		goto unlock;
-
-	ret = ovl_maybe_copy_up(file_dentry(file), O_WRONLY);
-	if (ret)
-		goto unlock;
-
-	ret = ovl_real_ioctl(file, cmd, arg);
-
-	ovl_copyflags(ovl_inode_real(inode), inode);
-unlock:
-	inode_unlock(inode);
-
-	mnt_drop_write_file(file);
-
-	return ret;
-
-}
-
-long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-	long ret;
-
-	switch (cmd) {
-	case FS_IOC_GETFLAGS:
-	case FS_IOC_FSGETXATTR:
-		ret = ovl_real_ioctl(file, cmd, arg);
-		break;
-
-	case FS_IOC_FSSETXATTR:
-	case FS_IOC_SETFLAGS:
-		ret = ovl_ioctl_set_flags(file, cmd, arg);
-		break;
-
-	default:
-		ret = -ENOTTY;
-	}
-
-	return ret;
-}
-
-#ifdef CONFIG_COMPAT
-long ovl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-	switch (cmd) {
-	case FS_IOC32_GETFLAGS:
-		cmd = FS_IOC_GETFLAGS;
-		break;
-
-	case FS_IOC32_SETFLAGS:
-		cmd = FS_IOC_SETFLAGS;
-		break;
-
-	default:
-		return -ENOIOCTLCMD;
-	}
-
-	return ovl_ioctl(file, cmd, arg);
-}
-#endif
-
 enum ovl_copyop {
 	OVL_COPY,
 	OVL_CLONE,
@@ -696,10 +590,6 @@ const struct file_operations ovl_file_operations = {
 	.mmap		= ovl_mmap,
 	.fallocate	= ovl_fallocate,
 	.fadvise	= ovl_fadvise,
-	.unlocked_ioctl	= ovl_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl	= ovl_compat_ioctl,
-#endif
 	.splice_read    = generic_file_splice_read,
 	.splice_write   = iter_file_splice_write,
 

fs/overlayfs/overlayfs.h

@@ -519,8 +519,6 @@ struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr);
 extern const struct file_operations ovl_file_operations;
 int __init ovl_aio_request_cache_init(void);
 void ovl_aio_request_cache_destroy(void);
-long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
-long ovl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa);
 int ovl_fileattr_set(struct user_namespace *mnt_userns,
 		     struct dentry *dentry, struct fileattr *fa);

fs/overlayfs/readdir.c

@@ -963,10 +963,6 @@ const struct file_operations ovl_dir_operations = {
 	.llseek		= ovl_dir_llseek,
 	.fsync		= ovl_dir_fsync,
 	.release	= ovl_dir_release,
-	.unlocked_ioctl	= ovl_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl	= ovl_compat_ioctl,
-#endif
 };
 
 int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list)