| 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, 2015, 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 161 | int obd_sysctl_init(void) |
| 162 | { |
| 163 | return sysfs_create_group(lustre_kobj, &lustre_attr_group); |
| 164 | } |