1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
37 #include <linux/module.h>
38 #include <linux/sysctl.h>
39 #include <linux/sched.h>
40 #include <linux/mm.h>
41 #include <linux/slab.h>
42 #include <linux/stat.h>
43 #include <linux/ctype.h>
44 #include <linux/bitops.h>
45 #include <linux/uaccess.h>
46 #include <linux/utsname.h>
47
48 #define DEBUG_SUBSYSTEM S_CLASS
49
50 #include "../../include/obd_support.h"
51 #include "../../include/lprocfs_status.h"
52
53 struct static_lustre_uintvalue_attr {
54 struct {
55 struct attribute attr;
56 ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
57 char *buf);
58 ssize_t (*store)(struct kobject *kobj, struct attribute *attr,
59 const char *buf, size_t len);
60 } u;
61 int *value;
62 };
63
static_uintvalue_show(struct kobject * kobj,struct attribute * attr,char * buf)64 static ssize_t static_uintvalue_show(struct kobject *kobj,
65 struct attribute *attr,
66 char *buf)
67 {
68 struct static_lustre_uintvalue_attr *lattr = (void *)attr;
69
70 return sprintf(buf, "%d\n", *lattr->value);
71 }
72
static_uintvalue_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t count)73 static ssize_t static_uintvalue_store(struct kobject *kobj,
74 struct attribute *attr,
75 const char *buffer, size_t count)
76 {
77 struct static_lustre_uintvalue_attr *lattr = (void *)attr;
78 int rc;
79 unsigned int val;
80
81 rc = kstrtouint(buffer, 10, &val);
82 if (rc)
83 return rc;
84
85 *lattr->value = val;
86
87 return count;
88 }
89
90 #define LUSTRE_STATIC_UINT_ATTR(name, value) \
91 static struct static_lustre_uintvalue_attr lustre_sattr_##name = \
92 {__ATTR(name, 0644, \
93 static_uintvalue_show, \
94 static_uintvalue_store),\
95 value }
96
97 LUSTRE_STATIC_UINT_ATTR(timeout, &obd_timeout);
98
max_dirty_mb_show(struct kobject * kobj,struct attribute * attr,char * buf)99 static ssize_t max_dirty_mb_show(struct kobject *kobj, struct attribute *attr,
100 char *buf)
101 {
102 return sprintf(buf, "%ul\n",
103 obd_max_dirty_pages / (1 << (20 - PAGE_CACHE_SHIFT)));
104 }
105
max_dirty_mb_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t count)106 static ssize_t max_dirty_mb_store(struct kobject *kobj, struct attribute *attr,
107 const char *buffer, size_t count)
108 {
109 int rc;
110 unsigned long val;
111
112 rc = kstrtoul(buffer, 10, &val);
113 if (rc)
114 return rc;
115
116 val *= 1 << (20 - PAGE_CACHE_SHIFT); /* convert to pages */
117
118 if (val > ((totalram_pages / 10) * 9)) {
119 /* Somebody wants to assign too much memory to dirty pages */
120 return -EINVAL;
121 }
122
123 if (val < 4 << (20 - PAGE_CACHE_SHIFT)) {
124 /* Less than 4 Mb for dirty cache is also bad */
125 return -EINVAL;
126 }
127
128 obd_max_dirty_pages = val;
129
130 return count;
131 }
132 LUSTRE_RW_ATTR(max_dirty_mb);
133
134 LUSTRE_STATIC_UINT_ATTR(debug_peer_on_timeout, &obd_debug_peer_on_timeout);
135 LUSTRE_STATIC_UINT_ATTR(dump_on_timeout, &obd_dump_on_timeout);
136 LUSTRE_STATIC_UINT_ATTR(dump_on_eviction, &obd_dump_on_eviction);
137 LUSTRE_STATIC_UINT_ATTR(at_min, &at_min);
138 LUSTRE_STATIC_UINT_ATTR(at_max, &at_max);
139 LUSTRE_STATIC_UINT_ATTR(at_extra, &at_extra);
140 LUSTRE_STATIC_UINT_ATTR(at_early_margin, &at_early_margin);
141 LUSTRE_STATIC_UINT_ATTR(at_history, &at_history);
142
143 static struct attribute *lustre_attrs[] = {
144 &lustre_sattr_timeout.u.attr,
145 &lustre_attr_max_dirty_mb.attr,
146 &lustre_sattr_debug_peer_on_timeout.u.attr,
147 &lustre_sattr_dump_on_timeout.u.attr,
148 &lustre_sattr_dump_on_eviction.u.attr,
149 &lustre_sattr_at_min.u.attr,
150 &lustre_sattr_at_max.u.attr,
151 &lustre_sattr_at_extra.u.attr,
152 &lustre_sattr_at_early_margin.u.attr,
153 &lustre_sattr_at_history.u.attr,
154 NULL,
155 };
156
157 static struct attribute_group lustre_attr_group = {
158 .attrs = lustre_attrs,
159 };
160
obd_sysctl_init(void)161 int obd_sysctl_init(void)
162 {
163 return sysfs_create_group(lustre_kobj, &lustre_attr_group);
164 }
165