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), LPU64"\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), LPU64"\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         __u64 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_write_frac_u64_helper(buffer, *lenp, &val,
 136                                                1 << (20 - PAGE_CACHE_SHIFT));
 137
 138                 /* Don't allow them to let dirty pages exceed 90% of system
 139                  * memory and set a hard minimum of 4MB. */
 140                 if (val > ((totalram_pages / 10) * 9)) {
 141                         CERROR("Refusing to set max dirty pages to "LPU64", "
 142                                "which is more than 90%% of available RAM; "
 143                                "setting to %lu\n", val,
 144                                ((totalram_pages / 10) * 9));
 145                         obd_max_dirty_pages = ((totalram_pages / 10) * 9);
 146                 } else if (val < 4 << (20 - PAGE_CACHE_SHIFT)) {
 147                         obd_max_dirty_pages = 4 << (20 - PAGE_CACHE_SHIFT);
 148                 } else {
 149                         obd_max_dirty_pages = val;
 150                 }
 151         } else {
 152                 char buf[21];
 153                 int len;
 154
 155                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 156                                                *(unsigned long *)table->data,
 157                                                1 << (20 - PAGE_CACHE_SHIFT));
 158                 if (len > *lenp)
 159                         len = *lenp;
 160                 buf[len] = '\0';
 161                 if (copy_to_user(buffer, buf, len))
 162                         return -EFAULT;
 163                 *lenp = len;
 164         }
 165         *ppos += *lenp;
 166         return rc;
 167 }
 168
 169 #ifdef CONFIG_SYSCTL
 170 static struct ctl_table obd_table[] = {
 171         {
 172                 INIT_CTL_NAME
 173                 .procname       = "timeout",
 174                 .data           = &obd_timeout,
 175                 .maxlen         = sizeof(int),
 176                 .mode           = 0644,
 177                 .proc_handler   = &proc_set_timeout
 178         },
 179         {
 180                 INIT_CTL_NAME
 181                 .procname       = "debug_peer_on_timeout",
 182                 .data           = &obd_debug_peer_on_timeout,
 183                 .maxlen         = sizeof(int),
 184                 .mode           = 0644,
 185                 .proc_handler   = &proc_dointvec
 186         },
 187         {
 188                 INIT_CTL_NAME
 189                 .procname       = "dump_on_timeout",
 190                 .data           = &obd_dump_on_timeout,
 191                 .maxlen         = sizeof(int),
 192                 .mode           = 0644,
 193                 .proc_handler   = &proc_dointvec
 194         },
 195         {
 196                 INIT_CTL_NAME
 197                 .procname       = "dump_on_eviction",
 198                 .data           = &obd_dump_on_eviction,
 199                 .maxlen         = sizeof(int),
 200                 .mode           = 0644,
 201                 .proc_handler   = &proc_dointvec
 202         },
 203         {
 204                 INIT_CTL_NAME
 205                 .procname       = "memused",
 206                 .data           = NULL,
 207                 .maxlen         = 0,
 208                 .mode           = 0444,
 209                 .proc_handler   = &proc_memory_alloc
 210         },
 211         {
 212                 INIT_CTL_NAME
 213                 .procname       = "memused_max",
 214                 .data           = NULL,
 215                 .maxlen         = 0,
 216                 .mode           = 0444,
 217                 .proc_handler   = &proc_mem_max
 218         },
 219         {
 220                 INIT_CTL_NAME
 221                 .procname       = "ldlm_timeout",
 222                 .data           = &ldlm_timeout,
 223                 .maxlen         = sizeof(int),
 224                 .mode           = 0644,
 225                 .proc_handler   = &proc_set_timeout
 226         },
 227         {
 228                 INIT_CTL_NAME
 229                 .procname       = "max_dirty_mb",
 230                 .data           = &obd_max_dirty_pages,
 231                 .maxlen         = sizeof(unsigned long),
 232                 .mode           = 0644,
 233                 .proc_handler   = &proc_max_dirty_pages_in_mb
 234         },
 235         {
 236                 INIT_CTL_NAME
 237                 .procname       = "bulk_timeout",
 238                 .data           = &bulk_timeout,
 239                 .maxlen         = sizeof(int),
 240                 .mode           = 0644,
 241                 .proc_handler   = &proc_dointvec
 242         },
 243         {
 244                 INIT_CTL_NAME
 245                 .procname       = "at_min",
 246                 .data           = &at_min,
 247                 .maxlen         = sizeof(int),
 248                 .mode           = 0644,
 249                 .proc_handler   = &proc_dointvec
 250         },
 251         {
 252                 INIT_CTL_NAME
 253                 .procname       = "at_max",
 254                 .data           = &at_max,
 255                 .maxlen         = sizeof(int),
 256                 .mode           = 0644,
 257                 .proc_handler   = &proc_dointvec
 258         },
 259         {
 260                 INIT_CTL_NAME
 261                 .procname       = "at_extra",
 262                 .data           = &at_extra,
 263                 .maxlen         = sizeof(int),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_dointvec
 266         },
 267         {
 268                 INIT_CTL_NAME
 269                 .procname       = "at_early_margin",
 270                 .data           = &at_early_margin,
 271                 .maxlen         = sizeof(int),
 272                 .mode           = 0644,
 273                 .proc_handler   = &proc_dointvec
 274         },
 275         {
 276                 INIT_CTL_NAME
 277                 .procname       = "at_history",
 278                 .data           = &at_history,
 279                 .maxlen         = sizeof(int),
 280                 .mode           = 0644,
 281                 .proc_handler   = &proc_dointvec
 282         },
 283         { 0 }
 284 };
 285
 286 static struct ctl_table parent_table[] = {
 287         {
 288                 INIT_CTL_NAME
 289                 .procname       = "lustre",
 290                 .data           = NULL,
 291                 .maxlen         = 0,
 292                 .mode           = 0555,
 293                 .child          = obd_table
 294         },
 295         { 0 }
 296 };
 297 #endif
 298
 299 void obd_sysctl_init (void)
 300 {
 301 #ifdef CONFIG_SYSCTL
 302         if ( !obd_table_header )
 303                 obd_table_header = register_sysctl_table(parent_table);
 304 #endif
 305 }
 306
 307 void obd_sysctl_clean (void)
 308 {
 309 #ifdef CONFIG_SYSCTL
 310         if ( obd_table_header )
 311                 unregister_sysctl_table(obd_table_header);
 312         obd_table_header = NULL;
 313 #endif
 314 }