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.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/sysctl.h>
  42 #include <linux/version.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/slab.h>
  45 #include <linux/stat.h>
  46 #include <linux/ctype.h>
  47 #include <asm/bitops.h>
  48 #include <asm/uaccess.h>
  49 #include <linux/utsname.h>
  50
  51 #define DEBUG_SUBSYSTEM S_CLASS
  52
  53 #include <obd_support.h>
  54 #include <lprocfs_status.h>
  55 #include <obd_class.h>
  56
  57 #ifdef CONFIG_SYSCTL
  58 static struct ctl_table_header *obd_table_header;
  59 #endif
  60
  61 static int
  62 proc_set_timeout(struct ctl_table *table, int write, void __user *buffer,
  63                  size_t *lenp, loff_t *ppos)
  64 {
  65         int rc;
  66
  67         rc = proc_dointvec(table, write, buffer, lenp, ppos);
  68         if (ldlm_timeout >= obd_timeout)
  69                 ldlm_timeout = max(obd_timeout / 3, 1U);
  70         return rc;
  71 }
  72
  73 static int
  74 proc_memory_alloc(struct ctl_table *table, int write, void __user *buffer,
  75                   size_t *lenp, loff_t *ppos)
  76 {
  77         char buf[22];
  78         int len;
  79
  80         if (!*lenp || (*ppos && !write)) {
  81                 *lenp = 0;
  82                 return 0;
  83         }
  84         if (write)
  85                 return -EINVAL;
  86
  87         len = snprintf(buf, sizeof(buf), "%llu\n", obd_memory_sum());
  88         if (len > *lenp)
  89                 len = *lenp;
  90         buf[len] = '\0';
  91         if (copy_to_user(buffer, buf, len))
  92                 return -EFAULT;
  93         *lenp = len;
  94         *ppos += *lenp;
  95         return 0;
  96 }
  97
  98 static int
  99 proc_mem_max(struct ctl_table *table, int write, void __user *buffer,
 100              size_t *lenp, loff_t *ppos)
 101 {
 102         char buf[22];
 103         int len;
 104
 105         if (!*lenp || (*ppos && !write)) {
 106                 *lenp = 0;
 107                 return 0;
 108         }
 109         if (write)
 110                 return -EINVAL;
 111
 112         len = snprintf(buf, sizeof(buf), "%llu\n", obd_memory_max());
 113         if (len > *lenp)
 114                 len = *lenp;
 115         buf[len] = '\0';
 116         if (copy_to_user(buffer, buf, len))
 117                 return -EFAULT;
 118         *lenp = len;
 119         *ppos += *lenp;
 120         return 0;
 121 }
 122
 123 static int
 124 proc_max_dirty_pages_in_mb(struct ctl_table *table, int write,
 125                            void __user *buffer, size_t *lenp, loff_t *ppos)
 126 {
 127         __s64 val;
 128         int rc = 0;
 129
 130         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 131                 *lenp = 0;
 132                 return 0;
 133         }
 134         if (write) {
 135                 rc = lprocfs_str_with_units_to_s64(buffer, *lenp, &val, 'M');
 136                 if (rc)
 137                         return rc;
 138
 139                 if (val < 0)
 140                         return -ERANGE;
 141
 142                 val >>= PAGE_SHIFT;
 143
 144                 /* Don't allow them to let dirty pages exceed 90% of system
 145                  * memory and set a hard minimum of 4MB. */
 146                 if (val > ((totalram_pages / 10) * 9)) {
 147                         CERROR("Refusing to set max dirty pages to %lld, "
 148                                "which is more than 90%% of available RAM; "
 149                                "setting to %lu\n", val,
 150                                ((totalram_pages / 10) * 9));
 151                         obd_max_dirty_pages = ((totalram_pages / 10) * 9);
 152                 } else if (val < 4 << (20 - PAGE_SHIFT)) {
 153                         obd_max_dirty_pages = 4 << (20 - PAGE_SHIFT);
 154                 } else {
 155                         obd_max_dirty_pages = val;
 156                 }
 157         } else {
 158                 char buf[21];
 159                 int len;
 160
 161                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 162                                                *(unsigned long *)table->data,
 163                                                1 << (20 - PAGE_SHIFT));
 164                 if (len > *lenp)
 165                         len = *lenp;
 166                 buf[len] = '\0';
 167                 if (copy_to_user(buffer, buf, len))
 168                         return -EFAULT;
 169                 *lenp = len;
 170         }
 171         *ppos += *lenp;
 172         return rc;
 173 }
 174
 175 #ifdef CONFIG_SYSCTL
 176 static struct ctl_table obd_table[] = {
 177         {
 178                 INIT_CTL_NAME
 179                 .procname       = "timeout",
 180                 .data           = &obd_timeout,
 181                 .maxlen         = sizeof(int),
 182                 .mode           = 0644,
 183                 .proc_handler   = &proc_set_timeout
 184         },
 185         {
 186                 INIT_CTL_NAME
 187                 .procname       = "debug_peer_on_timeout",
 188                 .data           = &obd_debug_peer_on_timeout,
 189                 .maxlen         = sizeof(int),
 190                 .mode           = 0644,
 191                 .proc_handler   = &proc_dointvec
 192         },
 193         {
 194                 INIT_CTL_NAME
 195                 .procname       = "dump_on_timeout",
 196                 .data           = &obd_dump_on_timeout,
 197                 .maxlen         = sizeof(int),
 198                 .mode           = 0644,
 199                 .proc_handler   = &proc_dointvec
 200         },
 201         {
 202                 INIT_CTL_NAME
 203                 .procname       = "dump_on_eviction",
 204                 .data           = &obd_dump_on_eviction,
 205                 .maxlen         = sizeof(int),
 206                 .mode           = 0644,
 207                 .proc_handler   = &proc_dointvec
 208         },
 209         {
 210                 INIT_CTL_NAME
 211                 .procname       = "memused",
 212                 .data           = NULL,
 213                 .maxlen         = 0,
 214                 .mode           = 0444,
 215                 .proc_handler   = &proc_memory_alloc
 216         },
 217         {
 218                 INIT_CTL_NAME
 219                 .procname       = "memused_max",
 220                 .data           = NULL,
 221                 .maxlen         = 0,
 222                 .mode           = 0444,
 223                 .proc_handler   = &proc_mem_max
 224         },
 225         {
 226                 INIT_CTL_NAME
 227                 .procname       = "ldlm_timeout",
 228                 .data           = &ldlm_timeout,
 229                 .maxlen         = sizeof(int),
 230                 .mode           = 0644,
 231                 .proc_handler   = &proc_set_timeout
 232         },
 233         {
 234                 INIT_CTL_NAME
 235                 .procname       = "max_dirty_mb",
 236                 .data           = &obd_max_dirty_pages,
 237                 .maxlen         = sizeof(unsigned long),
 238                 .mode           = 0644,
 239                 .proc_handler   = &proc_max_dirty_pages_in_mb
 240         },
 241         {
 242                 INIT_CTL_NAME
 243                 .procname       = "bulk_timeout",
 244                 .data           = &bulk_timeout,
 245                 .maxlen         = sizeof(int),
 246                 .mode           = 0644,
 247                 .proc_handler   = &proc_dointvec
 248         },
 249         {
 250                 INIT_CTL_NAME
 251                 .procname       = "at_min",
 252                 .data           = &at_min,
 253                 .maxlen         = sizeof(int),
 254                 .mode           = 0644,
 255                 .proc_handler   = &proc_dointvec
 256         },
 257         {
 258                 INIT_CTL_NAME
 259                 .procname       = "at_max",
 260                 .data           = &at_max,
 261                 .maxlen         = sizeof(int),
 262                 .mode           = 0644,
 263                 .proc_handler   = &proc_dointvec
 264         },
 265         {
 266                 INIT_CTL_NAME
 267                 .procname       = "at_extra",
 268                 .data           = &at_extra,
 269                 .maxlen         = sizeof(int),
 270                 .mode           = 0644,
 271                 .proc_handler   = &proc_dointvec
 272         },
 273         {
 274                 INIT_CTL_NAME
 275                 .procname       = "at_early_margin",
 276                 .data           = &at_early_margin,
 277                 .maxlen         = sizeof(int),
 278                 .mode           = 0644,
 279                 .proc_handler   = &proc_dointvec
 280         },
 281         {
 282                 INIT_CTL_NAME
 283                 .procname       = "at_history",
 284                 .data           = &at_history,
 285                 .maxlen         = sizeof(int),
 286                 .mode           = 0644,
 287                 .proc_handler   = &proc_dointvec
 288         },
 289         { 0 }
 290 };
 291
 292 static struct ctl_table parent_table[] = {
 293         {
 294                 INIT_CTL_NAME
 295                 .procname       = "lustre",
 296                 .data           = NULL,
 297                 .maxlen         = 0,
 298                 .mode           = 0555,
 299                 .child          = obd_table
 300         },
 301         { 0 }
 302 };
 303 #endif
 304
 305 void obd_sysctl_init (void)
 306 {
 307 #ifdef CONFIG_SYSCTL
 308         if ( !obd_table_header )
 309                 obd_table_header = register_sysctl_table(parent_table);
 310 #endif
 311 }
 312
 313 void obd_sysctl_clean (void)
 314 {
 315 #ifdef CONFIG_SYSCTL
 316         if ( obd_table_header )
 317                 unregister_sysctl_table(obd_table_header);
 318         obd_table_header = NULL;
 319 #endif
 320 }