lustre/obdclass/linux/linux-sysctl.c

   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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/sysctl.h>
  35 #include <linux/sched.h>
  36 #include <linux/mm.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/version.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/slab.h>
  41 #include <linux/stat.h>
  42 #include <linux/ctype.h>
  43 #include <asm/bitops.h>
  44 #include <asm/uaccess.h>
  45 #include <linux/utsname.h>
  46
  47 #define DEBUG_SUBSYSTEM S_CLASS
  48
  49 #include <obd_support.h>
  50 #include <lprocfs_status.h>
  51 #include <obd_class.h>
  52
  53 #ifdef CONFIG_SYSCTL
  54 static struct ctl_table_header *obd_table_header;
  55 #endif
  56
  57 struct static_lustre_uintvalue_attr {
  58         struct {
  59                 struct attribute attr;
  60                 ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
  61                                 char *buf);
  62                 ssize_t (*store)(struct kobject *kobj, struct attribute *attr,
  63                                  const char *buf, size_t len);
  64         } u;
  65         int *value;
  66 };
  67
  68 static ssize_t static_uintvalue_show(struct kobject *kobj,
  69                                      struct attribute *attr,
  70                                      char *buf)
  71 {
  72         struct static_lustre_uintvalue_attr *lattr = (void *)attr;
  73
  74         return sprintf(buf, "%d\n", *lattr->value);
  75 }
  76
  77 static ssize_t static_uintvalue_store(struct kobject *kobj,
  78                                       struct attribute *attr,
  79                                       const char *buffer, size_t count)
  80 {
  81         struct static_lustre_uintvalue_attr *lattr  = (void *)attr;
  82         unsigned int val;
  83         int rc;
  84
  85         rc = kstrtouint(buffer, 10, &val);
  86         if (rc)
  87                 return rc;
  88
  89         *lattr->value = val;
  90
  91         return count;
  92 }
  93
  94 #define LUSTRE_STATIC_UINT_ATTR(name, value) \
  95 static struct static_lustre_uintvalue_attr lustre_sattr_##name =        \
  96                                         {__ATTR(name, 0644,             \
  97                                                 static_uintvalue_show,  \
  98                                                 static_uintvalue_store),\
  99                                                 value }
 100
 101 LUSTRE_STATIC_UINT_ATTR(timeout, &obd_timeout);
 102
 103 #ifdef CONFIG_SYSCTL
 104 static int
 105 proc_memory_alloc(struct ctl_table *table, int write, void __user *buffer,
 106                   size_t *lenp, loff_t *ppos)
 107 {
 108         char buf[22];
 109         int len;
 110
 111         if (!*lenp || (*ppos && !write)) {
 112                 *lenp = 0;
 113                 return 0;
 114         }
 115         if (write)
 116                 return -EINVAL;
 117
 118         len = snprintf(buf, sizeof(buf), "%llu\n", obd_memory_sum());
 119         if (len > *lenp)
 120                 len = *lenp;
 121         buf[len] = '\0';
 122         if (copy_to_user(buffer, buf, len))
 123                 return -EFAULT;
 124         *lenp = len;
 125         *ppos += *lenp;
 126         return 0;
 127 }
 128
 129 static int
 130 proc_mem_max(struct ctl_table *table, int write, void __user *buffer,
 131              size_t *lenp, loff_t *ppos)
 132 {
 133         char buf[22];
 134         int len;
 135
 136         if (!*lenp || (*ppos && !write)) {
 137                 *lenp = 0;
 138                 return 0;
 139         }
 140         if (write)
 141                 return -EINVAL;
 142
 143         len = snprintf(buf, sizeof(buf), "%llu\n", obd_memory_max());
 144         if (len > *lenp)
 145                 len = *lenp;
 146         buf[len] = '\0';
 147         if (copy_to_user(buffer, buf, len))
 148                 return -EFAULT;
 149         *lenp = len;
 150         *ppos += *lenp;
 151         return 0;
 152 }
 153 #endif /* CONFIG_SYSCTL */
 154
 155 static ssize_t max_dirty_mb_show(struct kobject *kobj, struct attribute *attr,
 156                                  char *buf)
 157 {
 158         return sprintf(buf, "%lu\n",
 159                        obd_max_dirty_pages / (1 << (20 - PAGE_SHIFT)));
 160 }
 161
 162 static ssize_t max_dirty_mb_store(struct kobject *kobj, struct attribute *attr,
 163                                   const char *buffer, size_t count)
 164 {
 165         unsigned long val;
 166         int rc;
 167
 168         rc = kstrtoul(buffer, 10, &val);
 169         if (rc)
 170                 return rc;
 171
 172         val *= 1 << (20 - PAGE_SHIFT); /* convert to pages */
 173
 174         if (val > ((totalram_pages / 10) * 9)) {
 175                 /* Somebody wants to assign too much memory to dirty pages */
 176                 return -EINVAL;
 177         }
 178
 179         if (val < 4 << (20 - PAGE_SHIFT)) {
 180                 /* Less than 4 Mb for dirty cache is also bad */
 181                 return -EINVAL;
 182         }
 183
 184         obd_max_dirty_pages = val;
 185
 186         return count;
 187 }
 188 LUSTRE_RW_ATTR(max_dirty_mb);
 189
 190 LUSTRE_STATIC_UINT_ATTR(debug_peer_on_timeout, &obd_debug_peer_on_timeout);
 191 LUSTRE_STATIC_UINT_ATTR(dump_on_timeout, &obd_dump_on_timeout);
 192 LUSTRE_STATIC_UINT_ATTR(dump_on_eviction, &obd_dump_on_eviction);
 193 LUSTRE_STATIC_UINT_ATTR(at_min, &at_min);
 194 LUSTRE_STATIC_UINT_ATTR(at_max, &at_max);
 195 LUSTRE_STATIC_UINT_ATTR(at_extra, &at_extra);
 196 LUSTRE_STATIC_UINT_ATTR(at_early_margin, &at_early_margin);
 197 LUSTRE_STATIC_UINT_ATTR(at_history, &at_history);
 198
 199 #ifdef HAVE_SERVER_SUPPORT
 200 LUSTRE_STATIC_UINT_ATTR(ldlm_timeout, &ldlm_timeout);
 201 #endif
 202
 203 #ifdef CONFIG_SYSCTL
 204 static struct ctl_table obd_table[] = {
 205         {
 206                 INIT_CTL_NAME
 207                 .procname       = "memused",
 208                 .data           = NULL,
 209                 .maxlen         = 0,
 210                 .mode           = 0444,
 211                 .proc_handler   = &proc_memory_alloc
 212         },
 213         {
 214                 INIT_CTL_NAME
 215                 .procname       = "memused_max",
 216                 .data           = NULL,
 217                 .maxlen         = 0,
 218                 .mode           = 0444,
 219                 .proc_handler   = &proc_mem_max
 220         },
 221         {
 222                 INIT_CTL_NAME
 223                 .procname       = "bulk_timeout",
 224                 .data           = &bulk_timeout,
 225                 .maxlen         = sizeof(int),
 226                 .mode           = 0644,
 227                 .proc_handler   = &proc_dointvec
 228         },
 229         { 0 }
 230 };
 231
 232 static struct ctl_table parent_table[] = {
 233         {
 234                 INIT_CTL_NAME
 235                 .procname       = "lustre",
 236                 .data           = NULL,
 237                 .maxlen         = 0,
 238                 .mode           = 0555,
 239                 .child          = obd_table
 240         },
 241         { 0 }
 242 };
 243 #endif
 244
 245 static struct attribute *lustre_attrs[] = {
 246         &lustre_sattr_timeout.u.attr,
 247         &lustre_attr_max_dirty_mb.attr,
 248         &lustre_sattr_debug_peer_on_timeout.u.attr,
 249         &lustre_sattr_dump_on_timeout.u.attr,
 250         &lustre_sattr_dump_on_eviction.u.attr,
 251         &lustre_sattr_at_min.u.attr,
 252         &lustre_sattr_at_max.u.attr,
 253         &lustre_sattr_at_extra.u.attr,
 254         &lustre_sattr_at_early_margin.u.attr,
 255         &lustre_sattr_at_history.u.attr,
 256 #ifdef HAVE_SERVER_SUPPORT
 257         &lustre_sattr_ldlm_timeout.u.attr,
 258 #endif
 259         NULL,
 260 };
 261
 262 static struct attribute_group lustre_attr_group = {
 263         .attrs = lustre_attrs,
 264 };
 265
 266 int obd_sysctl_init(void)
 267 {
 268 #ifdef CONFIG_SYSCTL
 269         if ( !obd_table_header )
 270                 obd_table_header = register_sysctl_table(parent_table);
 271 #endif
 272         return sysfs_create_group(lustre_kobj, &lustre_attr_group);
 273 }
 274
 275 void obd_sysctl_clean (void)
 276 {
 277 #ifdef CONFIG_SYSCTL
 278         if ( obd_table_header )
 279                 unregister_sysctl_table(obd_table_header);
 280         obd_table_header = NULL;
 281 #endif
 282 }