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 static int
  61 proc_set_timeout(struct ctl_table *table, int write, void __user *buffer,
  62                  size_t *lenp, loff_t *ppos)
  63 {
  64         int rc;
  65
  66         rc = proc_dointvec(table, write, buffer, lenp, ppos);
  67         if (ldlm_timeout >= obd_timeout)
  68                 ldlm_timeout = max(obd_timeout / 3, 1U);
  69         return rc;
  70 }
  71
  72 static int
  73 proc_memory_alloc(struct ctl_table *table, int write, void __user *buffer,
  74                   size_t *lenp, loff_t *ppos)
  75 {
  76         char buf[22];
  77         int len;
  78
  79         if (!*lenp || (*ppos && !write)) {
  80                 *lenp = 0;
  81                 return 0;
  82         }
  83         if (write)
  84                 return -EINVAL;
  85
  86         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_sum());
  87         if (len > *lenp)
  88                 len = *lenp;
  89         buf[len] = '\0';
  90         if (copy_to_user(buffer, buf, len))
  91                 return -EFAULT;
  92         *lenp = len;
  93         *ppos += *lenp;
  94         return 0;
  95 }
  96
  97 static int
  98 proc_pages_alloc(struct ctl_table *table, int write, void __user *buffer,
  99                  size_t *lenp, loff_t *ppos)
 100 {
 101         char buf[22];
 102         int len;
 103
 104         if (!*lenp || (*ppos && !write)) {
 105                 *lenp = 0;
 106                 return 0;
 107         }
 108         if (write)
 109                 return -EINVAL;
 110
 111         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_sum());
 112         if (len > *lenp)
 113                 len = *lenp;
 114         buf[len] = '\0';
 115         if (copy_to_user(buffer, buf, len))
 116                 return -EFAULT;
 117         *lenp = len;
 118         *ppos += *lenp;
 119         return 0;
 120 }
 121
 122 static int
 123 proc_mem_max(struct ctl_table *table, int write, void __user *buffer,
 124              size_t *lenp, loff_t *ppos)
 125 {
 126         char buf[22];
 127         int len;
 128
 129         if (!*lenp || (*ppos && !write)) {
 130                 *lenp = 0;
 131                 return 0;
 132         }
 133         if (write)
 134                 return -EINVAL;
 135
 136         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_max());
 137         if (len > *lenp)
 138                 len = *lenp;
 139         buf[len] = '\0';
 140         if (copy_to_user(buffer, buf, len))
 141                 return -EFAULT;
 142         *lenp = len;
 143         *ppos += *lenp;
 144         return 0;
 145 }
 146
 147 static int
 148 proc_pages_max(struct ctl_table *table, int write, void __user *buffer,
 149                size_t *lenp, loff_t *ppos)
 150 {
 151         char buf[22];
 152         int len;
 153
 154         if (!*lenp || (*ppos && !write)) {
 155                 *lenp = 0;
 156                 return 0;
 157         }
 158         if (write)
 159                 return -EINVAL;
 160
 161         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_max());
 162         if (len > *lenp)
 163                 len = *lenp;
 164         buf[len] = '\0';
 165         if (copy_to_user(buffer, buf, len))
 166                 return -EFAULT;
 167         *lenp = len;
 168         *ppos += *lenp;
 169         return 0;
 170 }
 171
 172 static int
 173 proc_max_dirty_pages_in_mb(struct ctl_table *table, int write,
 174                            void __user *buffer, size_t *lenp, loff_t *ppos)
 175 {
 176         __u64 val;
 177         int rc = 0;
 178
 179         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 180                 *lenp = 0;
 181                 return 0;
 182         }
 183         if (write) {
 184                 rc = lprocfs_write_frac_u64_helper(buffer, *lenp, &val,
 185                                                1 << (20 - PAGE_CACHE_SHIFT));
 186                 obd_max_dirty_pages = (unsigned long)val;
 187
 188                 /* Don't allow them to let dirty pages exceed 90% of system
 189                  * memory and set a hard minimum of 4MB. */
 190                 if (obd_max_dirty_pages > ((totalram_pages / 10) * 9)) {
 191                         CERROR("Refusing to set max dirty pages to %lu, which "
 192                                "is more than 90%% of available RAM; setting "
 193                                "to %lu\n", obd_max_dirty_pages,
 194                                ((totalram_pages / 10) * 9));
 195                         obd_max_dirty_pages = ((totalram_pages / 10) * 9);
 196                 } else if (obd_max_dirty_pages < 4 << (20 - PAGE_CACHE_SHIFT)) {
 197                         obd_max_dirty_pages = 4 << (20 - PAGE_CACHE_SHIFT);
 198                 }
 199         } else {
 200                 char buf[21];
 201                 int len;
 202
 203                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 204                                                *(unsigned long *)table->data,
 205                                                1 << (20 - PAGE_CACHE_SHIFT));
 206                 if (len > *lenp)
 207                         len = *lenp;
 208                 buf[len] = '\0';
 209                 if (copy_to_user(buffer, buf, len))
 210                         return -EFAULT;
 211                 *lenp = len;
 212         }
 213         *ppos += *lenp;
 214         return rc;
 215 }
 216
 217 #ifdef RANDOM_FAIL_ALLOC
 218 int proc_alloc_fail_rate(struct ctl_table *table, int write,
 219                          void __user *buffer, size_t *lenp, loff_t *ppos)
 220 {
 221         int rc          = 0;
 222
 223         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 224                 *lenp = 0;
 225                 return 0;
 226         }
 227         if (write) {
 228                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 229                                                (unsigned int*)table->data,
 230                                                OBD_ALLOC_FAIL_MULT);
 231         } else {
 232                 char buf[21];
 233                 int  len;
 234
 235                 len = lprocfs_read_frac_helper(buf, 21,
 236                                                *(unsigned int*)table->data,
 237                                                OBD_ALLOC_FAIL_MULT);
 238                 if (len > *lenp)
 239                         len = *lenp;
 240                 buf[len] = '\0';
 241                 if (copy_to_user(buffer, buf, len))
 242                         return -EFAULT;
 243                 *lenp = len;
 244         }
 245         *ppos += *lenp;
 246         return rc;
 247 }
 248 #endif
 249
 250 #ifdef CONFIG_SYSCTL
 251 static struct ctl_table obd_table[] = {
 252         {
 253                 INIT_CTL_NAME
 254                 .procname       = "timeout",
 255                 .data           = &obd_timeout,
 256                 .maxlen         = sizeof(int),
 257                 .mode           = 0644,
 258                 .proc_handler   = &proc_set_timeout
 259         },
 260         {
 261                 INIT_CTL_NAME
 262                 .procname       = "debug_peer_on_timeout",
 263                 .data           = &obd_debug_peer_on_timeout,
 264                 .maxlen         = sizeof(int),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_dointvec
 267         },
 268         {
 269                 INIT_CTL_NAME
 270                 .procname       = "dump_on_timeout",
 271                 .data           = &obd_dump_on_timeout,
 272                 .maxlen         = sizeof(int),
 273                 .mode           = 0644,
 274                 .proc_handler   = &proc_dointvec
 275         },
 276         {
 277                 INIT_CTL_NAME
 278                 .procname       = "dump_on_eviction",
 279                 .data           = &obd_dump_on_eviction,
 280                 .maxlen         = sizeof(int),
 281                 .mode           = 0644,
 282                 .proc_handler   = &proc_dointvec
 283         },
 284         {
 285                 INIT_CTL_NAME
 286                 .procname       = "memused",
 287                 .data           = NULL,
 288                 .maxlen         = 0,
 289                 .mode           = 0444,
 290                 .proc_handler   = &proc_memory_alloc
 291         },
 292         {
 293                 INIT_CTL_NAME
 294                 .procname       = "pagesused",
 295                 .data           = NULL,
 296                 .maxlen         = 0,
 297                 .mode           = 0444,
 298                 .proc_handler   = &proc_pages_alloc
 299         },
 300         {
 301                 INIT_CTL_NAME
 302                 .procname       = "memused_max",
 303                 .data           = NULL,
 304                 .maxlen         = 0,
 305                 .mode           = 0444,
 306                 .proc_handler   = &proc_mem_max
 307         },
 308         {
 309                 INIT_CTL_NAME
 310                 .procname       = "pagesused_max",
 311                 .data           = NULL,
 312                 .maxlen         = 0,
 313                 .mode           = 0444,
 314                 .proc_handler   = &proc_pages_max
 315         },
 316         {
 317                 INIT_CTL_NAME
 318                 .procname       = "ldlm_timeout",
 319                 .data           = &ldlm_timeout,
 320                 .maxlen         = sizeof(int),
 321                 .mode           = 0644,
 322                 .proc_handler   = &proc_set_timeout
 323         },
 324 #ifdef RANDOM_FAIL_ALLOC
 325         {
 326                 INIT_CTL_NAME
 327                 .procname       = "alloc_fail_rate",
 328                 .data           = &obd_alloc_fail_rate,
 329                 .maxlen         = sizeof(int),
 330                 .mode           = 0644,
 331                 .proc_handler   = &proc_alloc_fail_rate
 332         },
 333 #endif
 334         {
 335                 INIT_CTL_NAME
 336                 .procname       = "max_dirty_mb",
 337                 .data           = &obd_max_dirty_pages,
 338                 .maxlen         = sizeof(unsigned long),
 339                 .mode           = 0644,
 340                 .proc_handler   = &proc_max_dirty_pages_in_mb
 341         },
 342         {
 343                 INIT_CTL_NAME
 344                 .procname       = "bulk_timeout",
 345                 .data           = &bulk_timeout,
 346                 .maxlen         = sizeof(int),
 347                 .mode           = 0644,
 348                 .proc_handler   = &proc_dointvec
 349         },
 350         {
 351                 INIT_CTL_NAME
 352                 .procname       = "at_min",
 353                 .data           = &at_min,
 354                 .maxlen         = sizeof(int),
 355                 .mode           = 0644,
 356                 .proc_handler   = &proc_dointvec
 357         },
 358         {
 359                 INIT_CTL_NAME
 360                 .procname       = "at_max",
 361                 .data           = &at_max,
 362                 .maxlen         = sizeof(int),
 363                 .mode           = 0644,
 364                 .proc_handler   = &proc_dointvec
 365         },
 366         {
 367                 INIT_CTL_NAME
 368                 .procname       = "at_extra",
 369                 .data           = &at_extra,
 370                 .maxlen         = sizeof(int),
 371                 .mode           = 0644,
 372                 .proc_handler   = &proc_dointvec
 373         },
 374         {
 375                 INIT_CTL_NAME
 376                 .procname       = "at_early_margin",
 377                 .data           = &at_early_margin,
 378                 .maxlen         = sizeof(int),
 379                 .mode           = 0644,
 380                 .proc_handler   = &proc_dointvec
 381         },
 382         {
 383                 INIT_CTL_NAME
 384                 .procname       = "at_history",
 385                 .data           = &at_history,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = &proc_dointvec
 389         },
 390         { 0 }
 391 };
 392
 393 static struct ctl_table parent_table[] = {
 394         {
 395                 INIT_CTL_NAME
 396                 .procname       = "lustre",
 397                 .data           = NULL,
 398                 .maxlen         = 0,
 399                 .mode           = 0555,
 400                 .child          = obd_table
 401         },
 402         { 0 }
 403 };
 404 #endif
 405
 406 void obd_sysctl_init (void)
 407 {
 408 #ifdef CONFIG_SYSCTL
 409         if ( !obd_table_header )
 410                 obd_table_header = register_sysctl_table(parent_table);
 411 #endif
 412 }
 413
 414 void obd_sysctl_clean (void)
 415 {
 416 #ifdef CONFIG_SYSCTL
 417         if ( obd_table_header )
 418                 unregister_sysctl_table(obd_table_header);
 419         obd_table_header = NULL;
 420 #endif
 421 }