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, 2014, 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_pages_alloc(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_pages_sum());
 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_mem_max(struct ctl_table *table, int write, void __user *buffer,
 125              size_t *lenp, loff_t *ppos)
 126 {
 127         char buf[22];
 128         int len;
 129
 130         if (!*lenp || (*ppos && !write)) {
 131                 *lenp = 0;
 132                 return 0;
 133         }
 134         if (write)
 135                 return -EINVAL;
 136
 137         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_max());
 138         if (len > *lenp)
 139                 len = *lenp;
 140         buf[len] = '\0';
 141         if (copy_to_user(buffer, buf, len))
 142                 return -EFAULT;
 143         *lenp = len;
 144         *ppos += *lenp;
 145         return 0;
 146 }
 147
 148 static int
 149 proc_pages_max(struct ctl_table *table, int write, void __user *buffer,
 150                size_t *lenp, loff_t *ppos)
 151 {
 152         char buf[22];
 153         int len;
 154
 155         if (!*lenp || (*ppos && !write)) {
 156                 *lenp = 0;
 157                 return 0;
 158         }
 159         if (write)
 160                 return -EINVAL;
 161
 162         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_max());
 163         if (len > *lenp)
 164                 len = *lenp;
 165         buf[len] = '\0';
 166         if (copy_to_user(buffer, buf, len))
 167                 return -EFAULT;
 168         *lenp = len;
 169         *ppos += *lenp;
 170         return 0;
 171 }
 172
 173 static int
 174 proc_max_dirty_pages_in_mb(struct ctl_table *table, int write,
 175                            void __user *buffer, size_t *lenp, loff_t *ppos)
 176 {
 177         __u64 val;
 178         int rc = 0;
 179
 180         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 181                 *lenp = 0;
 182                 return 0;
 183         }
 184         if (write) {
 185                 rc = lprocfs_write_frac_u64_helper(buffer, *lenp, &val,
 186                                                1 << (20 - PAGE_CACHE_SHIFT));
 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 (val > ((totalram_pages / 10) * 9)) {
 191                         CERROR("Refusing to set max dirty pages to "LPU64", "
 192                                "which is more than 90%% of available RAM; "
 193                                "setting to %lu\n", val,
 194                                ((totalram_pages / 10) * 9));
 195                         obd_max_dirty_pages = ((totalram_pages / 10) * 9);
 196                 } else if (val < 4 << (20 - PAGE_CACHE_SHIFT)) {
 197                         obd_max_dirty_pages = 4 << (20 - PAGE_CACHE_SHIFT);
 198                 } else {
 199                         obd_max_dirty_pages = val;
 200                 }
 201         } else {
 202                 char buf[21];
 203                 int len;
 204
 205                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 206                                                *(unsigned long *)table->data,
 207                                                1 << (20 - PAGE_CACHE_SHIFT));
 208                 if (len > *lenp)
 209                         len = *lenp;
 210                 buf[len] = '\0';
 211                 if (copy_to_user(buffer, buf, len))
 212                         return -EFAULT;
 213                 *lenp = len;
 214         }
 215         *ppos += *lenp;
 216         return rc;
 217 }
 218
 219 #ifdef RANDOM_FAIL_ALLOC
 220 static int proc_alloc_fail_rate(struct ctl_table *table, int write,
 221                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 222 {
 223         int rc          = 0;
 224
 225         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 226                 *lenp = 0;
 227                 return 0;
 228         }
 229         if (write) {
 230                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 231                                                (unsigned int*)table->data,
 232                                                OBD_ALLOC_FAIL_MULT);
 233         } else {
 234                 char buf[21];
 235                 int  len;
 236
 237                 len = lprocfs_read_frac_helper(buf, 21,
 238                                                *(unsigned int*)table->data,
 239                                                OBD_ALLOC_FAIL_MULT);
 240                 if (len > *lenp)
 241                         len = *lenp;
 242                 buf[len] = '\0';
 243                 if (copy_to_user(buffer, buf, len))
 244                         return -EFAULT;
 245                 *lenp = len;
 246         }
 247         *ppos += *lenp;
 248         return rc;
 249 }
 250 #endif
 251
 252 #ifdef CONFIG_SYSCTL
 253 static struct ctl_table obd_table[] = {
 254         {
 255                 INIT_CTL_NAME
 256                 .procname       = "timeout",
 257                 .data           = &obd_timeout,
 258                 .maxlen         = sizeof(int),
 259                 .mode           = 0644,
 260                 .proc_handler   = &proc_set_timeout
 261         },
 262         {
 263                 INIT_CTL_NAME
 264                 .procname       = "debug_peer_on_timeout",
 265                 .data           = &obd_debug_peer_on_timeout,
 266                 .maxlen         = sizeof(int),
 267                 .mode           = 0644,
 268                 .proc_handler   = &proc_dointvec
 269         },
 270         {
 271                 INIT_CTL_NAME
 272                 .procname       = "dump_on_timeout",
 273                 .data           = &obd_dump_on_timeout,
 274                 .maxlen         = sizeof(int),
 275                 .mode           = 0644,
 276                 .proc_handler   = &proc_dointvec
 277         },
 278         {
 279                 INIT_CTL_NAME
 280                 .procname       = "dump_on_eviction",
 281                 .data           = &obd_dump_on_eviction,
 282                 .maxlen         = sizeof(int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec
 285         },
 286         {
 287                 INIT_CTL_NAME
 288                 .procname       = "memused",
 289                 .data           = NULL,
 290                 .maxlen         = 0,
 291                 .mode           = 0444,
 292                 .proc_handler   = &proc_memory_alloc
 293         },
 294         {
 295                 INIT_CTL_NAME
 296                 .procname       = "pagesused",
 297                 .data           = NULL,
 298                 .maxlen         = 0,
 299                 .mode           = 0444,
 300                 .proc_handler   = &proc_pages_alloc
 301         },
 302         {
 303                 INIT_CTL_NAME
 304                 .procname       = "memused_max",
 305                 .data           = NULL,
 306                 .maxlen         = 0,
 307                 .mode           = 0444,
 308                 .proc_handler   = &proc_mem_max
 309         },
 310         {
 311                 INIT_CTL_NAME
 312                 .procname       = "pagesused_max",
 313                 .data           = NULL,
 314                 .maxlen         = 0,
 315                 .mode           = 0444,
 316                 .proc_handler   = &proc_pages_max
 317         },
 318         {
 319                 INIT_CTL_NAME
 320                 .procname       = "ldlm_timeout",
 321                 .data           = &ldlm_timeout,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &proc_set_timeout
 325         },
 326 #ifdef RANDOM_FAIL_ALLOC
 327         {
 328                 INIT_CTL_NAME
 329                 .procname       = "alloc_fail_rate",
 330                 .data           = &obd_alloc_fail_rate,
 331                 .maxlen         = sizeof(int),
 332                 .mode           = 0644,
 333                 .proc_handler   = &proc_alloc_fail_rate
 334         },
 335 #endif
 336         {
 337                 INIT_CTL_NAME
 338                 .procname       = "max_dirty_mb",
 339                 .data           = &obd_max_dirty_pages,
 340                 .maxlen         = sizeof(unsigned long),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_max_dirty_pages_in_mb
 343         },
 344         {
 345                 INIT_CTL_NAME
 346                 .procname       = "bulk_timeout",
 347                 .data           = &bulk_timeout,
 348                 .maxlen         = sizeof(int),
 349                 .mode           = 0644,
 350                 .proc_handler   = &proc_dointvec
 351         },
 352         {
 353                 INIT_CTL_NAME
 354                 .procname       = "at_min",
 355                 .data           = &at_min,
 356                 .maxlen         = sizeof(int),
 357                 .mode           = 0644,
 358                 .proc_handler   = &proc_dointvec
 359         },
 360         {
 361                 INIT_CTL_NAME
 362                 .procname       = "at_max",
 363                 .data           = &at_max,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = &proc_dointvec
 367         },
 368         {
 369                 INIT_CTL_NAME
 370                 .procname       = "at_extra",
 371                 .data           = &at_extra,
 372                 .maxlen         = sizeof(int),
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dointvec
 375         },
 376         {
 377                 INIT_CTL_NAME
 378                 .procname       = "at_early_margin",
 379                 .data           = &at_early_margin,
 380                 .maxlen         = sizeof(int),
 381                 .mode           = 0644,
 382                 .proc_handler   = &proc_dointvec
 383         },
 384         {
 385                 INIT_CTL_NAME
 386                 .procname       = "at_history",
 387                 .data           = &at_history,
 388                 .maxlen         = sizeof(int),
 389                 .mode           = 0644,
 390                 .proc_handler   = &proc_dointvec
 391         },
 392         { 0 }
 393 };
 394
 395 static struct ctl_table parent_table[] = {
 396         {
 397                 INIT_CTL_NAME
 398                 .procname       = "lustre",
 399                 .data           = NULL,
 400                 .maxlen         = 0,
 401                 .mode           = 0555,
 402                 .child          = obd_table
 403         },
 404         { 0 }
 405 };
 406 #endif
 407
 408 void obd_sysctl_init (void)
 409 {
 410 #ifdef CONFIG_SYSCTL
 411         if ( !obd_table_header )
 412                 obd_table_header = register_sysctl_table(parent_table);
 413 #endif
 414 }
 415
 416 void obd_sysctl_clean (void)
 417 {
 418 #ifdef CONFIG_SYSCTL
 419         if ( obd_table_header )
 420                 unregister_sysctl_table(obd_table_header);
 421         obd_table_header = NULL;
 422 #endif
 423 }