C++ (Cpp) xfs_attrmulti_attr_set Examples

Example #1

File: xfs_ioctl.c Project: 19Dan01/linux

STATIC int
xfs_attrmulti_by_handle(
	struct file		*parfilp,
	void			__user *arg)
{
	int			error;
	xfs_attr_multiop_t	*ops;
	xfs_fsop_attrmulti_handlereq_t am_hreq;
	struct dentry		*dentry;
	unsigned int		i, size;
	unsigned char		*attr_name;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
		return -EFAULT;

	/* overflow check */
	if (am_hreq.opcount >= INT_MAX / sizeof(xfs_attr_multiop_t))
		return -E2BIG;

	dentry = xfs_handlereq_to_dentry(parfilp, &am_hreq.hreq);
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);

	error = -E2BIG;
	size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
	if (!size || size > 16 * PAGE_SIZE)
		goto out_dput;

	ops = memdup_user(am_hreq.ops, size);
	if (IS_ERR(ops)) {
		error = PTR_ERR(ops);
		goto out_dput;
	}

	error = -ENOMEM;
	attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
	if (!attr_name)
		goto out_kfree_ops;

	error = 0;
	for (i = 0; i < am_hreq.opcount; i++) {
		ops[i].am_error = strncpy_from_user((char *)attr_name,
				ops[i].am_attrname, MAXNAMELEN);
		if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
			error = -ERANGE;
		if (ops[i].am_error < 0)
			break;

		switch (ops[i].am_opcode) {
		case ATTR_OP_GET:
			ops[i].am_error = xfs_attrmulti_attr_get(
					d_inode(dentry), attr_name,
					ops[i].am_attrvalue, &ops[i].am_length,
					ops[i].am_flags);
			break;
		case ATTR_OP_SET:
			ops[i].am_error = mnt_want_write_file(parfilp);
			if (ops[i].am_error)
				break;
			ops[i].am_error = xfs_attrmulti_attr_set(
					d_inode(dentry), attr_name,
					ops[i].am_attrvalue, ops[i].am_length,
					ops[i].am_flags);
			mnt_drop_write_file(parfilp);
			break;
		case ATTR_OP_REMOVE:
			ops[i].am_error = mnt_want_write_file(parfilp);
			if (ops[i].am_error)
				break;
			ops[i].am_error = xfs_attrmulti_attr_remove(
					d_inode(dentry), attr_name,
					ops[i].am_flags);
			mnt_drop_write_file(parfilp);
			break;
		default:
			ops[i].am_error = -EINVAL;
		}
	}

	if (copy_to_user(am_hreq.ops, ops, size))
		error = -EFAULT;

	kfree(attr_name);
 out_kfree_ops:
	kfree(ops);
 out_dput:
	dput(dentry);
	return error;
}

Example #2

File: xfs_ioctl.c Project: Mr-Aloof/wl500g

STATIC int
xfs_attrmulti_by_handle(
	xfs_mount_t		*mp,
	void			__user *arg,
	struct inode		*parinode)
{
	int			error;
	xfs_attr_multiop_t	*ops;
	xfs_fsop_attrmulti_handlereq_t am_hreq;
	struct inode		*inode;
	unsigned int		i, size;
	char			*attr_name;

	if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);
	if (copy_from_user(&am_hreq, arg, sizeof(xfs_fsop_attrmulti_handlereq_t)))
		return -XFS_ERROR(EFAULT);

	error = xfs_vget_fsop_handlereq(mp, parinode, &am_hreq.hreq, &inode);
	if (error)
		goto out;

	error = E2BIG;
	size = am_hreq.opcount * sizeof(xfs_attr_multiop_t);
	if (!size || size > 16 * PAGE_SIZE)
		goto out_vn_rele;

	error = ENOMEM;
	ops = memdup_user(am_hreq.ops, size);
	if (IS_ERR(ops)) {
		error = PTR_ERR(ops);
		goto out_kfree_ops;
	}

	attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
	if (!attr_name)
		goto out_kfree_ops;


	error = 0;
	for (i = 0; i < am_hreq.opcount; i++) {
		ops[i].am_error = strncpy_from_user(attr_name,
				ops[i].am_attrname, MAXNAMELEN);
		if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
			error = -ERANGE;
		if (ops[i].am_error < 0)
			break;

		switch (ops[i].am_opcode) {
		case ATTR_OP_GET:
			ops[i].am_error = xfs_attrmulti_attr_get(inode,
					attr_name, ops[i].am_attrvalue,
					&ops[i].am_length, ops[i].am_flags);
			break;
		case ATTR_OP_SET:
			ops[i].am_error = xfs_attrmulti_attr_set(inode,
					attr_name, ops[i].am_attrvalue,
					ops[i].am_length, ops[i].am_flags);
			break;
		case ATTR_OP_REMOVE:
			ops[i].am_error = xfs_attrmulti_attr_remove(inode,
					attr_name, ops[i].am_flags);
			break;
		default:
			ops[i].am_error = EINVAL;
		}
	}

	if (copy_to_user(am_hreq.ops, ops, size))
		error = XFS_ERROR(EFAULT);

	kfree(attr_name);
 out_kfree_ops:
	kfree(ops);
 out_vn_rele:
	iput(inode);
 out:
	return -error;
}