晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/rdma/rdma_user_ioctl_cmds.h
/*
 * Copyright (c) 2018, Mellanox Technologies inc.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef RDMA_USER_IOCTL_CMDS_H
#define RDMA_USER_IOCTL_CMDS_H

#include <linux/types.h>
#include <linux/ioctl.h>

/* Documentation/ioctl/ioctl-number.txt */
#define RDMA_IOCTL_MAGIC	0x1b
#define RDMA_VERBS_IOCTL \
	_IOWR(RDMA_IOCTL_MAGIC, 1, struct ib_uverbs_ioctl_hdr)

enum {
	/* User input */
	UVERBS_ATTR_F_MANDATORY = 1U << 0,
	/*
	 * Valid output bit should be ignored and considered set in
	 * mandatory fields. This bit is kernel output.
	 */
	UVERBS_ATTR_F_VALID_OUTPUT = 1U << 1,
};

struct ib_uverbs_attr {
	__u16 attr_id;		/* command specific type attribute */
	__u16 len;		/* only for pointers and IDRs array */
	__u16 flags;		/* combination of UVERBS_ATTR_F_XXXX */
	union {
		struct {
			__u8 elem_id;
			__u8 reserved;
		} enum_data;
		__u16 reserved;
	} attr_data;
	union {
		/*
		 * ptr to command, __inline__ data, idr/fd or
		 * ptr to __u32 array of IDRs
		 */
		__aligned_u64 data;
		/* Used by FD_IN and FD_OUT */
		__s64 data_s64;
	};
};

struct ib_uverbs_ioctl_hdr {
	__u16 length;
	__u16 object_id;
	__u16 method_id;
	__u16 num_attrs;
	__aligned_u64 reserved1;
	__u32 driver_id;
	__u32 reserved2;
	struct ib_uverbs_attr  attrs[];
};

#endif

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