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         int rc = 0;
 177
 178         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 179                 *lenp = 0;
 180                 return 0;
 181         }
 182         if (write) {
 183                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 184                                                (unsigned int *)table->data,
 185                                                1 << (20 - PAGE_CACHE_SHIFT));
 186                 /* Don't allow them to let dirty pages exceed 90% of system
 187                  * memory and set a hard minimum of 4MB. */
 188                 if (obd_max_dirty_pages > ((totalram_pages / 10) * 9)) {
 189                         CERROR("Refusing to set max dirty pages to %u, which "
 190                                "is more than 90%% of available RAM; setting "
 191                                "to %lu\n", obd_max_dirty_pages,
 192                                ((totalram_pages / 10) * 9));
 193                         obd_max_dirty_pages = ((totalram_pages / 10) * 9);
 194                 } else if (obd_max_dirty_pages < 4 << (20 - PAGE_CACHE_SHIFT)) {
 195                         obd_max_dirty_pages = 4 << (20 - PAGE_CACHE_SHIFT);
 196                 }
 197         } else {
 198                 char buf[21];
 199                 int len;
 200
 201                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 202                                                *(unsigned int *)table->data,
 203                                                1 << (20 - PAGE_CACHE_SHIFT));
 204                 if (len > *lenp)
 205                         len = *lenp;
 206                 buf[len] = '\0';
 207                 if (copy_to_user(buffer, buf, len))
 208                         return -EFAULT;
 209                 *lenp = len;
 210         }
 211         *ppos += *lenp;
 212         return rc;
 213 }
 214
 215 #ifdef RANDOM_FAIL_ALLOC
 216 int proc_alloc_fail_rate(struct ctl_table *table, int write,
 217                          void __user *buffer, size_t *lenp, loff_t *ppos)
 218 {
 219         int rc          = 0;
 220
 221         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 222                 *lenp = 0;
 223                 return 0;
 224         }
 225         if (write) {
 226                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 227                                                (unsigned int*)table->data,
 228                                                OBD_ALLOC_FAIL_MULT);
 229         } else {
 230                 char buf[21];
 231                 int  len;
 232
 233                 len = lprocfs_read_frac_helper(buf, 21,
 234                                                *(unsigned int*)table->data,
 235                                                OBD_ALLOC_FAIL_MULT);
 236                 if (len > *lenp)
 237                         len = *lenp;
 238                 buf[len] = '\0';
 239                 if (copy_to_user(buffer, buf, len))
 240                         return -EFAULT;
 241                 *lenp = len;
 242         }
 243         *ppos += *lenp;
 244         return rc;
 245 }
 246 #endif
 247
 248 #ifdef CONFIG_SYSCTL
 249 static struct ctl_table obd_table[] = {
 250         {
 251                 INIT_CTL_NAME
 252                 .procname       = "timeout",
 253                 .data           = &obd_timeout,
 254                 .maxlen         = sizeof(int),
 255                 .mode           = 0644,
 256                 .proc_handler   = &proc_set_timeout
 257         },
 258         {
 259                 INIT_CTL_NAME
 260                 .procname       = "debug_peer_on_timeout",
 261                 .data           = &obd_debug_peer_on_timeout,
 262                 .maxlen         = sizeof(int),
 263                 .mode           = 0644,
 264                 .proc_handler   = &proc_dointvec
 265         },
 266         {
 267                 INIT_CTL_NAME
 268                 .procname       = "dump_on_timeout",
 269                 .data           = &obd_dump_on_timeout,
 270                 .maxlen         = sizeof(int),
 271                 .mode           = 0644,
 272                 .proc_handler   = &proc_dointvec
 273         },
 274         {
 275                 INIT_CTL_NAME
 276                 .procname       = "dump_on_eviction",
 277                 .data           = &obd_dump_on_eviction,
 278                 .maxlen         = sizeof(int),
 279                 .mode           = 0644,
 280                 .proc_handler   = &proc_dointvec
 281         },
 282         {
 283                 INIT_CTL_NAME
 284                 .procname       = "memused",
 285                 .data           = NULL,
 286                 .maxlen         = 0,
 287                 .mode           = 0444,
 288                 .proc_handler   = &proc_memory_alloc
 289         },
 290         {
 291                 INIT_CTL_NAME
 292                 .procname       = "pagesused",
 293                 .data           = NULL,
 294                 .maxlen         = 0,
 295                 .mode           = 0444,
 296                 .proc_handler   = &proc_pages_alloc
 297         },
 298         {
 299                 INIT_CTL_NAME
 300                 .procname       = "memused_max",
 301                 .data           = NULL,
 302                 .maxlen         = 0,
 303                 .mode           = 0444,
 304                 .proc_handler   = &proc_mem_max
 305         },
 306         {
 307                 INIT_CTL_NAME
 308                 .procname       = "pagesused_max",
 309                 .data           = NULL,
 310                 .maxlen         = 0,
 311                 .mode           = 0444,
 312                 .proc_handler   = &proc_pages_max
 313         },
 314         {
 315                 INIT_CTL_NAME
 316                 .procname       = "ldlm_timeout",
 317                 .data           = &ldlm_timeout,
 318                 .maxlen         = sizeof(int),
 319                 .mode           = 0644,
 320                 .proc_handler   = &proc_set_timeout
 321         },
 322 #ifdef RANDOM_FAIL_ALLOC
 323         {
 324                 INIT_CTL_NAME
 325                 .procname       = "alloc_fail_rate",
 326                 .data           = &obd_alloc_fail_rate,
 327                 .maxlen         = sizeof(int),
 328                 .mode           = 0644,
 329                 .proc_handler   = &proc_alloc_fail_rate
 330         },
 331 #endif
 332         {
 333                 INIT_CTL_NAME
 334                 .procname       = "max_dirty_mb",
 335                 .data           = &obd_max_dirty_pages,
 336                 .maxlen         = sizeof(int),
 337                 .mode           = 0644,
 338                 .proc_handler   = &proc_max_dirty_pages_in_mb
 339         },
 340         {
 341                 INIT_CTL_NAME
 342                 .procname       = "bulk_timeout",
 343                 .data           = &bulk_timeout,
 344                 .maxlen         = sizeof(int),
 345                 .mode           = 0644,
 346                 .proc_handler   = &proc_dointvec
 347         },
 348         {
 349                 INIT_CTL_NAME
 350                 .procname       = "at_min",
 351                 .data           = &at_min,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = &proc_dointvec
 355         },
 356         {
 357                 INIT_CTL_NAME
 358                 .procname       = "at_max",
 359                 .data           = &at_max,
 360                 .maxlen         = sizeof(int),
 361                 .mode           = 0644,
 362                 .proc_handler   = &proc_dointvec
 363         },
 364         {
 365                 INIT_CTL_NAME
 366                 .procname       = "at_extra",
 367                 .data           = &at_extra,
 368                 .maxlen         = sizeof(int),
 369                 .mode           = 0644,
 370                 .proc_handler   = &proc_dointvec
 371         },
 372         {
 373                 INIT_CTL_NAME
 374                 .procname       = "at_early_margin",
 375                 .data           = &at_early_margin,
 376                 .maxlen         = sizeof(int),
 377                 .mode           = 0644,
 378                 .proc_handler   = &proc_dointvec
 379         },
 380         {
 381                 INIT_CTL_NAME
 382                 .procname       = "at_history",
 383                 .data           = &at_history,
 384                 .maxlen         = sizeof(int),
 385                 .mode           = 0644,
 386                 .proc_handler   = &proc_dointvec
 387         },
 388         { 0 }
 389 };
 390
 391 static struct ctl_table parent_table[] = {
 392         {
 393                 INIT_CTL_NAME
 394                 .procname       = "lustre",
 395                 .data           = NULL,
 396                 .maxlen         = 0,
 397                 .mode           = 0555,
 398                 .child          = obd_table
 399         },
 400         { 0 }
 401 };
 402 #endif
 403
 404 void obd_sysctl_init (void)
 405 {
 406 #ifdef CONFIG_SYSCTL
 407         if ( !obd_table_header )
 408                 obd_table_header = register_sysctl_table(parent_table);
 409 #endif
 410 }
 411
 412 void obd_sysctl_clean (void)
 413 {
 414 #ifdef CONFIG_SYSCTL
 415         if ( obd_table_header )
 416                 unregister_sysctl_table(obd_table_header);
 417         obd_table_header = NULL;
 418 #endif
 419 }