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, 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
  56 #ifdef CONFIG_SYSCTL
  57 struct ctl_table_header *obd_table_header = NULL;
  58 #endif
  59
  60 int LL_PROC_PROTO(proc_set_timeout)
  61 {
  62         int rc;
  63
  64         rc = proc_dointvec(table, write, buffer, lenp, ppos);
  65         if (ldlm_timeout >= obd_timeout)
  66                 ldlm_timeout = max(obd_timeout / 3, 1U);
  67         return rc;
  68 }
  69
  70 int LL_PROC_PROTO(proc_memory_alloc)
  71 {
  72         char buf[22];
  73         int len;
  74
  75         if (!*lenp || (*ppos && !write)) {
  76                 *lenp = 0;
  77                 return 0;
  78         }
  79         if (write)
  80                 return -EINVAL;
  81
  82         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_sum());
  83         if (len > *lenp)
  84                 len = *lenp;
  85         buf[len] = '\0';
  86         if (copy_to_user(buffer, buf, len))
  87                 return -EFAULT;
  88         *lenp = len;
  89         *ppos += *lenp;
  90         return 0;
  91 }
  92
  93 int LL_PROC_PROTO(proc_pages_alloc)
  94 {
  95         char buf[22];
  96         int len;
  97
  98         if (!*lenp || (*ppos && !write)) {
  99                 *lenp = 0;
 100                 return 0;
 101         }
 102         if (write)
 103                 return -EINVAL;
 104
 105         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_sum());
 106         if (len > *lenp)
 107                 len = *lenp;
 108         buf[len] = '\0';
 109         if (copy_to_user(buffer, buf, len))
 110                 return -EFAULT;
 111         *lenp = len;
 112         *ppos += *lenp;
 113         return 0;
 114 }
 115
 116 int LL_PROC_PROTO(proc_mem_max)
 117 {
 118         char buf[22];
 119         int len;
 120
 121         if (!*lenp || (*ppos && !write)) {
 122                 *lenp = 0;
 123                 return 0;
 124         }
 125         if (write)
 126                 return -EINVAL;
 127
 128         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_max());
 129         if (len > *lenp)
 130                 len = *lenp;
 131         buf[len] = '\0';
 132         if (copy_to_user(buffer, buf, len))
 133                 return -EFAULT;
 134         *lenp = len;
 135         *ppos += *lenp;
 136         return 0;
 137 }
 138
 139 int LL_PROC_PROTO(proc_pages_max)
 140 {
 141         char buf[22];
 142         int len;
 143
 144         if (!*lenp || (*ppos && !write)) {
 145                 *lenp = 0;
 146                 return 0;
 147         }
 148         if (write)
 149                 return -EINVAL;
 150
 151         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_max());
 152         if (len > *lenp)
 153                 len = *lenp;
 154         buf[len] = '\0';
 155         if (copy_to_user(buffer, buf, len))
 156                 return -EFAULT;
 157         *lenp = len;
 158         *ppos += *lenp;
 159         return 0;
 160 }
 161
 162 int LL_PROC_PROTO(proc_max_dirty_pages_in_mb)
 163 {
 164         int rc = 0;
 165
 166         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 167                 *lenp = 0;
 168                 return 0;
 169         }
 170         if (write) {
 171                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 172                                                (unsigned int *)table->data,
 173                                                1 << (20 - PAGE_CACHE_SHIFT));
 174                 /* Don't allow them to let dirty pages exceed 90% of system
 175                  * memory and set a hard minimum of 4MB. */
 176                 if (obd_max_dirty_pages > ((totalram_pages / 10) * 9)) {
 177                         CERROR("Refusing to set max dirty pages to %u, which "
 178                                "is more than 90%% of available RAM; setting "
 179                                "to %lu\n", obd_max_dirty_pages,
 180                                ((totalram_pages / 10) * 9));
 181                         obd_max_dirty_pages = ((totalram_pages / 10) * 9);
 182                 } else if (obd_max_dirty_pages < 4 << (20 - PAGE_CACHE_SHIFT)) {
 183                         obd_max_dirty_pages = 4 << (20 - PAGE_CACHE_SHIFT);
 184                 }
 185         } else {
 186                 char buf[21];
 187                 int len;
 188
 189                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 190                                                *(unsigned int *)table->data,
 191                                                1 << (20 - PAGE_CACHE_SHIFT));
 192                 if (len > *lenp)
 193                         len = *lenp;
 194                 buf[len] = '\0';
 195                 if (copy_to_user(buffer, buf, len))
 196                         return -EFAULT;
 197                 *lenp = len;
 198         }
 199         *ppos += *lenp;
 200         return rc;
 201 }
 202
 203 #ifdef RANDOM_FAIL_ALLOC
 204 int proc_alloc_fail_rate(struct ctl_table *table, int write,
 205                          void __user *buffer, size_t *lenp, loff_t *ppos)
 206 {
 207         int rc          = 0;
 208
 209         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 210                 *lenp = 0;
 211                 return 0;
 212         }
 213         if (write) {
 214                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 215                                                (unsigned int*)table->data,
 216                                                OBD_ALLOC_FAIL_MULT);
 217         } else {
 218                 char buf[21];
 219                 int  len;
 220
 221                 len = lprocfs_read_frac_helper(buf, 21,
 222                                                *(unsigned int*)table->data,
 223                                                OBD_ALLOC_FAIL_MULT);
 224                 if (len > *lenp)
 225                         len = *lenp;
 226                 buf[len] = '\0';
 227                 if (copy_to_user(buffer, buf, len))
 228                         return -EFAULT;
 229                 *lenp = len;
 230         }
 231         *ppos += *lenp;
 232         return rc;
 233 }
 234 #endif
 235
 236 int LL_PROC_PROTO(proc_at_min)
 237 {
 238         return proc_dointvec(table, write, buffer, lenp, ppos);
 239 }
 240 int LL_PROC_PROTO(proc_at_max)
 241 {
 242         return proc_dointvec(table, write, buffer, lenp, ppos);
 243 }
 244 int LL_PROC_PROTO(proc_at_extra)
 245 {
 246         return proc_dointvec(table, write, buffer, lenp, ppos);
 247 }
 248 int LL_PROC_PROTO(proc_at_early_margin)
 249 {
 250         return proc_dointvec(table, write, buffer, lenp, ppos);
 251 }
 252 int LL_PROC_PROTO(proc_at_history)
 253 {
 254         return proc_dointvec(table, write, buffer, lenp, ppos);
 255 }
 256
 257 #ifdef CONFIG_SYSCTL
 258 static struct ctl_table obd_table[] = {
 259         {
 260                 INIT_CTL_NAME
 261                 .procname       = "timeout",
 262                 .data           = &obd_timeout,
 263                 .maxlen         = sizeof(int),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_set_timeout
 266         },
 267         {
 268                 INIT_CTL_NAME
 269                 .procname       = "debug_peer_on_timeout",
 270                 .data           = &obd_debug_peer_on_timeout,
 271                 .maxlen         = sizeof(int),
 272                 .mode           = 0644,
 273                 .proc_handler   = &proc_dointvec
 274         },
 275         {
 276                 INIT_CTL_NAME
 277                 .procname       = "dump_on_timeout",
 278                 .data           = &obd_dump_on_timeout,
 279                 .maxlen         = sizeof(int),
 280                 .mode           = 0644,
 281                 .proc_handler   = &proc_dointvec
 282         },
 283         {
 284                 INIT_CTL_NAME
 285                 .procname       = "dump_on_eviction",
 286                 .data           = &obd_dump_on_eviction,
 287                 .maxlen         = sizeof(int),
 288                 .mode           = 0644,
 289                 .proc_handler   = &proc_dointvec
 290         },
 291         {
 292                 INIT_CTL_NAME
 293                 .procname       = "memused",
 294                 .data           = NULL,
 295                 .maxlen         = 0,
 296                 .mode           = 0444,
 297                 .proc_handler   = &proc_memory_alloc
 298         },
 299         {
 300                 INIT_CTL_NAME
 301                 .procname       = "pagesused",
 302                 .data           = NULL,
 303                 .maxlen         = 0,
 304                 .mode           = 0444,
 305                 .proc_handler   = &proc_pages_alloc
 306         },
 307         {
 308                 INIT_CTL_NAME
 309                 .procname       = "memused_max",
 310                 .data           = NULL,
 311                 .maxlen         = 0,
 312                 .mode           = 0444,
 313                 .proc_handler   = &proc_mem_max
 314         },
 315         {
 316                 INIT_CTL_NAME
 317                 .procname       = "pagesused_max",
 318                 .data           = NULL,
 319                 .maxlen         = 0,
 320                 .mode           = 0444,
 321                 .proc_handler   = &proc_pages_max
 322         },
 323         {
 324                 INIT_CTL_NAME
 325                 .procname       = "ldlm_timeout",
 326                 .data           = &ldlm_timeout,
 327                 .maxlen         = sizeof(int),
 328                 .mode           = 0644,
 329                 .proc_handler   = &proc_set_timeout
 330         },
 331 #ifdef RANDOM_FAIL_ALLOC
 332         {
 333                 INIT_CTL_NAME
 334                 .procname       = "alloc_fail_rate",
 335                 .data           = &obd_alloc_fail_rate,
 336                 .maxlen         = sizeof(int),
 337                 .mode           = 0644,
 338                 .proc_handler   = &proc_alloc_fail_rate
 339         },
 340 #endif
 341         {
 342                 INIT_CTL_NAME
 343                 .procname       = "max_dirty_mb",
 344                 .data           = &obd_max_dirty_pages,
 345                 .maxlen         = sizeof(int),
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_max_dirty_pages_in_mb
 348         },
 349         {
 350                 INIT_CTL_NAME
 351                 .procname       = "at_min",
 352                 .data           = &at_min,
 353                 .maxlen         = sizeof(int),
 354                 .mode           = 0644,
 355                 .proc_handler   = &proc_at_min
 356         },
 357         {
 358                 INIT_CTL_NAME
 359                 .procname       = "at_max",
 360                 .data           = &at_max,
 361                 .maxlen         = sizeof(int),
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_at_max
 364         },
 365         {
 366                 INIT_CTL_NAME
 367                 .procname       = "at_extra",
 368                 .data           = &at_extra,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &proc_at_extra
 372         },
 373         {
 374                 INIT_CTL_NAME
 375                 .procname       = "at_early_margin",
 376                 .data           = &at_early_margin,
 377                 .maxlen         = sizeof(int),
 378                 .mode           = 0644,
 379                 .proc_handler   = &proc_at_early_margin
 380         },
 381         {
 382                 INIT_CTL_NAME
 383                 .procname       = "at_history",
 384                 .data           = &at_history,
 385                 .maxlen         = sizeof(int),
 386                 .mode           = 0644,
 387                 .proc_handler   = &proc_at_history
 388         },
 389         { 0 }
 390 };
 391
 392 static struct ctl_table parent_table[] = {
 393         {
 394                 INIT_CTL_NAME
 395                 .procname       = "lustre",
 396                 .data           = NULL,
 397                 .maxlen         = 0,
 398                 .mode           = 0555,
 399                 .child          = obd_table
 400         },
 401         { 0 }
 402 };
 403 #endif
 404
 405 void obd_sysctl_init (void)
 406 {
 407 #ifdef CONFIG_SYSCTL
 408         if ( !obd_table_header )
 409                 obd_table_header = register_sysctl_table(parent_table);
 410 #endif
 411 }
 412
 413 void obd_sysctl_clean (void)
 414 {
 415 #ifdef CONFIG_SYSCTL
 416         if ( obd_table_header )
 417                 unregister_sysctl_table(obd_table_header);
 418         obd_table_header = NULL;
 419 #endif
 420 }