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 static int
  58 proc_set_timeout(struct ctl_table *table, int write, void __user *buffer,
  59                  size_t *lenp, loff_t *ppos)
  60 {
  61         int rc;
  62
  63         rc = proc_dointvec(table, write, buffer, lenp, ppos);
  64         if (ldlm_timeout >= obd_timeout)
  65                 ldlm_timeout = max(obd_timeout / 3, 1U);
  66         return rc;
  67 }
  68
  69 static int
  70 proc_memory_alloc(struct ctl_table *table, int write, void __user *buffer,
  71                   size_t *lenp, loff_t *ppos)
  72 {
  73         char buf[22];
  74         int len;
  75
  76         if (!*lenp || (*ppos && !write)) {
  77                 *lenp = 0;
  78                 return 0;
  79         }
  80         if (write)
  81                 return -EINVAL;
  82
  83         len = snprintf(buf, sizeof(buf), "%llu\n", obd_memory_sum());
  84         if (len > *lenp)
  85                 len = *lenp;
  86         buf[len] = '\0';
  87         if (copy_to_user(buffer, buf, len))
  88                 return -EFAULT;
  89         *lenp = len;
  90         *ppos += *lenp;
  91         return 0;
  92 }
  93
  94 static int
  95 proc_mem_max(struct ctl_table *table, int write, void __user *buffer,
  96              size_t *lenp, loff_t *ppos)
  97 {
  98         char buf[22];
  99         int len;
 100
 101         if (!*lenp || (*ppos && !write)) {
 102                 *lenp = 0;
 103                 return 0;
 104         }
 105         if (write)
 106                 return -EINVAL;
 107
 108         len = snprintf(buf, sizeof(buf), "%llu\n", obd_memory_max());
 109         if (len > *lenp)
 110                 len = *lenp;
 111         buf[len] = '\0';
 112         if (copy_to_user(buffer, buf, len))
 113                 return -EFAULT;
 114         *lenp = len;
 115         *ppos += *lenp;
 116         return 0;
 117 }
 118
 119 static int
 120 proc_max_dirty_pages_in_mb(struct ctl_table *table, int write,
 121                            void __user *buffer, size_t *lenp, loff_t *ppos)
 122 {
 123         __s64 val;
 124         int rc = 0;
 125
 126         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 127                 *lenp = 0;
 128                 return 0;
 129         }
 130         if (write) {
 131                 rc = lprocfs_str_with_units_to_s64(buffer, *lenp, &val, 'M');
 132                 if (rc)
 133                         return rc;
 134
 135                 if (val < 0)
 136                         return -ERANGE;
 137
 138                 val >>= PAGE_SHIFT;
 139
 140                 /* Don't allow them to let dirty pages exceed 90% of system
 141                  * memory and set a hard minimum of 4MB. */
 142                 if (val > ((totalram_pages / 10) * 9)) {
 143                         CERROR("Refusing to set max dirty pages to %lld, "
 144                                "which is more than 90%% of available RAM; "
 145                                "setting to %lu\n", val,
 146                                ((totalram_pages / 10) * 9));
 147                         obd_max_dirty_pages = ((totalram_pages / 10) * 9);
 148                 } else if (val < 4 << (20 - PAGE_SHIFT)) {
 149                         obd_max_dirty_pages = 4 << (20 - PAGE_SHIFT);
 150                 } else {
 151                         obd_max_dirty_pages = val;
 152                 }
 153         } else {
 154                 char buf[21];
 155                 int len;
 156
 157                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 158                                                *(unsigned long *)table->data,
 159                                                1 << (20 - PAGE_SHIFT));
 160                 if (len > *lenp)
 161                         len = *lenp;
 162                 buf[len] = '\0';
 163                 if (copy_to_user(buffer, buf, len))
 164                         return -EFAULT;
 165                 *lenp = len;
 166         }
 167         *ppos += *lenp;
 168         return rc;
 169 }
 170
 171 #ifdef CONFIG_SYSCTL
 172 static struct ctl_table obd_table[] = {
 173         {
 174                 INIT_CTL_NAME
 175                 .procname       = "timeout",
 176                 .data           = &obd_timeout,
 177                 .maxlen         = sizeof(int),
 178                 .mode           = 0644,
 179                 .proc_handler   = &proc_set_timeout
 180         },
 181         {
 182                 INIT_CTL_NAME
 183                 .procname       = "debug_peer_on_timeout",
 184                 .data           = &obd_debug_peer_on_timeout,
 185                 .maxlen         = sizeof(int),
 186                 .mode           = 0644,
 187                 .proc_handler   = &proc_dointvec
 188         },
 189         {
 190                 INIT_CTL_NAME
 191                 .procname       = "dump_on_timeout",
 192                 .data           = &obd_dump_on_timeout,
 193                 .maxlen         = sizeof(int),
 194                 .mode           = 0644,
 195                 .proc_handler   = &proc_dointvec
 196         },
 197         {
 198                 INIT_CTL_NAME
 199                 .procname       = "dump_on_eviction",
 200                 .data           = &obd_dump_on_eviction,
 201                 .maxlen         = sizeof(int),
 202                 .mode           = 0644,
 203                 .proc_handler   = &proc_dointvec
 204         },
 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       = "ldlm_timeout",
 224                 .data           = &ldlm_timeout,
 225                 .maxlen         = sizeof(int),
 226                 .mode           = 0644,
 227                 .proc_handler   = &proc_set_timeout
 228         },
 229         {
 230                 INIT_CTL_NAME
 231                 .procname       = "max_dirty_mb",
 232                 .data           = &obd_max_dirty_pages,
 233                 .maxlen         = sizeof(unsigned long),
 234                 .mode           = 0644,
 235                 .proc_handler   = &proc_max_dirty_pages_in_mb
 236         },
 237         {
 238                 INIT_CTL_NAME
 239                 .procname       = "bulk_timeout",
 240                 .data           = &bulk_timeout,
 241                 .maxlen         = sizeof(int),
 242                 .mode           = 0644,
 243                 .proc_handler   = &proc_dointvec
 244         },
 245         {
 246                 INIT_CTL_NAME
 247                 .procname       = "at_min",
 248                 .data           = &at_min,
 249                 .maxlen         = sizeof(int),
 250                 .mode           = 0644,
 251                 .proc_handler   = &proc_dointvec
 252         },
 253         {
 254                 INIT_CTL_NAME
 255                 .procname       = "at_max",
 256                 .data           = &at_max,
 257                 .maxlen         = sizeof(int),
 258                 .mode           = 0644,
 259                 .proc_handler   = &proc_dointvec
 260         },
 261         {
 262                 INIT_CTL_NAME
 263                 .procname       = "at_extra",
 264                 .data           = &at_extra,
 265                 .maxlen         = sizeof(int),
 266                 .mode           = 0644,
 267                 .proc_handler   = &proc_dointvec
 268         },
 269         {
 270                 INIT_CTL_NAME
 271                 .procname       = "at_early_margin",
 272                 .data           = &at_early_margin,
 273                 .maxlen         = sizeof(int),
 274                 .mode           = 0644,
 275                 .proc_handler   = &proc_dointvec
 276         },
 277         {
 278                 INIT_CTL_NAME
 279                 .procname       = "at_history",
 280                 .data           = &at_history,
 281                 .maxlen         = sizeof(int),
 282                 .mode           = 0644,
 283                 .proc_handler   = &proc_dointvec
 284         },
 285         { 0 }
 286 };
 287
 288 static struct ctl_table parent_table[] = {
 289         {
 290                 INIT_CTL_NAME
 291                 .procname       = "lustre",
 292                 .data           = NULL,
 293                 .maxlen         = 0,
 294                 .mode           = 0555,
 295                 .child          = obd_table
 296         },
 297         { 0 }
 298 };
 299 #endif
 300
 301 void obd_sysctl_init (void)
 302 {
 303 #ifdef CONFIG_SYSCTL
 304         if ( !obd_table_header )
 305                 obd_table_header = register_sysctl_table(parent_table);
 306 #endif
 307 }
 308
 309 void obd_sysctl_clean (void)
 310 {
 311 #ifdef CONFIG_SYSCTL
 312         if ( obd_table_header )
 313                 unregister_sysctl_table(obd_table_header);
 314         obd_table_header = NULL;
 315 #endif
 316 }