1/*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "defs.h"
29
30enum {
31	IOPRIO_WHO_PROCESS = 1,
32	IOPRIO_WHO_PGRP,
33	IOPRIO_WHO_USER
34};
35
36#include "xlat/ioprio_who.h"
37
38enum {
39	IOPRIO_CLASS_NONE,
40	IOPRIO_CLASS_RT,
41	IOPRIO_CLASS_BE,
42	IOPRIO_CLASS_IDLE
43};
44
45#include "xlat/ioprio_class.h"
46
47#define IOPRIO_CLASS_SHIFT	(13)
48#define IOPRIO_PRIO_MASK	((1ul << IOPRIO_CLASS_SHIFT) - 1)
49
50#define IOPRIO_PRIO_CLASS(mask)	((mask) >> IOPRIO_CLASS_SHIFT)
51#define IOPRIO_PRIO_DATA(mask)	((mask) & IOPRIO_PRIO_MASK)
52
53static const char *
54sprint_ioprio(int ioprio)
55{
56	static char outstr[256];
57	const char *str;
58	int class, data;
59
60	class = IOPRIO_PRIO_CLASS(ioprio);
61	data = IOPRIO_PRIO_DATA(ioprio);
62	str = xlookup(ioprio_class, class);
63	if (str)
64		sprintf(outstr, "IOPRIO_PRIO_VALUE(%s,%d)", str, data);
65	else
66		sprintf(outstr, "IOPRIO_PRIO_VALUE(%#x /* %s */,%d)",
67			class, "IOPRIO_CLASS_???", data);
68
69	return outstr;
70}
71
72SYS_FUNC(ioprio_get)
73{
74	if (entering(tcp)) {
75		/* int which */
76		printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
77		/* int who */
78		tprintf(", %d", (int) tcp->u_arg[1]);
79		return 0;
80	} else {
81		if (syserror(tcp))
82			return 0;
83
84		tcp->auxstr = sprint_ioprio(tcp->u_rval);
85		return RVAL_STR;
86	}
87}
88
89SYS_FUNC(ioprio_set)
90{
91	/* int which */
92	printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
93	/* int who */
94	tprintf(", %d, ", (int) tcp->u_arg[1]);
95	/* int ioprio */
96	tprints(sprint_ioprio(tcp->u_arg[2]));
97
98	return RVAL_DECODED;
99}
100