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
 187                 /* Don't allow them to let dirty pages exceed 90% of system
 188                  * memory and set a hard minimum of 4MB. */
 189                 if (val > ((totalram_pages / 10) * 9)) {
 190                         CERROR("Refusing to set max dirty pages to "LPU64", "
 191                                "which is more than 90%% of available RAM; "
 192                                "setting to %lu\n", val,
 193                                ((totalram_pages / 10) * 9));
 194                         obd_max_dirty_pages = ((totalram_pages / 10) * 9);
 195                 } else if (val < 4 << (20 - PAGE_CACHE_SHIFT)) {
 196                         obd_max_dirty_pages = 4 << (20 - PAGE_CACHE_SHIFT);
 197                 } else {
 198                         obd_max_dirty_pages = val;
 199                 }
 200         } else {
 201                 char buf[21];
 202                 int len;
 203
 204                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 205                                                *(unsigned long *)table->data,
 206                                                1 << (20 - PAGE_CACHE_SHIFT));
 207                 if (len > *lenp)
 208                         len = *lenp;
 209                 buf[len] = '\0';
 210                 if (copy_to_user(buffer, buf, len))
 211                         return -EFAULT;
 212                 *lenp = len;
 213         }
 214         *ppos += *lenp;
 215         return rc;
 216 }
 217
 218 #ifdef RANDOM_FAIL_ALLOC
 219 int proc_alloc_fail_rate(struct ctl_table *table, int write,
 220                          void __user *buffer, size_t *lenp, loff_t *ppos)
 221 {
 222         int rc          = 0;
 223
 224         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 225                 *lenp = 0;
 226                 return 0;
 227         }
 228         if (write) {
 229                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 230                                                (unsigned int*)table->data,
 231                                                OBD_ALLOC_FAIL_MULT);
 232         } else {
 233                 char buf[21];
 234                 int  len;
 235
 236                 len = lprocfs_read_frac_helper(buf, 21,
 237                                                *(unsigned int*)table->data,
 238                                                OBD_ALLOC_FAIL_MULT);
 239                 if (len > *lenp)
 240                         len = *lenp;
 241                 buf[len] = '\0';
 242                 if (copy_to_user(buffer, buf, len))
 243                         return -EFAULT;
 244                 *lenp = len;
 245         }
 246         *ppos += *lenp;
 247         return rc;
 248 }
 249 #endif
 250
 251 #ifdef CONFIG_SYSCTL
 252 static struct ctl_table obd_table[] = {
 253         {
 254                 INIT_CTL_NAME
 255                 .procname       = "timeout",
 256                 .data           = &obd_timeout,
 257                 .maxlen         = sizeof(int),
 258                 .mode           = 0644,
 259                 .proc_handler   = &proc_set_timeout
 260         },
 261         {
 262                 INIT_CTL_NAME
 263                 .procname       = "debug_peer_on_timeout",
 264                 .data           = &obd_debug_peer_on_timeout,
 265                 .maxlen         = sizeof(int),
 266                 .mode           = 0644,
 267                 .proc_handler   = &proc_dointvec
 268         },
 269         {
 270                 INIT_CTL_NAME
 271                 .procname       = "dump_on_timeout",
 272                 .data           = &obd_dump_on_timeout,
 273                 .maxlen         = sizeof(int),
 274                 .mode           = 0644,
 275                 .proc_handler   = &proc_dointvec
 276         },
 277         {
 278                 INIT_CTL_NAME
 279                 .procname       = "dump_on_eviction",
 280                 .data           = &obd_dump_on_eviction,
 281                 .maxlen         = sizeof(int),
 282                 .mode           = 0644,
 283                 .proc_handler   = &proc_dointvec
 284         },
 285         {
 286                 INIT_CTL_NAME
 287                 .procname       = "memused",
 288                 .data           = NULL,
 289                 .maxlen         = 0,
 290                 .mode           = 0444,
 291                 .proc_handler   = &proc_memory_alloc
 292         },
 293         {
 294                 INIT_CTL_NAME
 295                 .procname       = "pagesused",
 296                 .data           = NULL,
 297                 .maxlen         = 0,
 298                 .mode           = 0444,
 299                 .proc_handler   = &proc_pages_alloc
 300         },
 301         {
 302                 INIT_CTL_NAME
 303                 .procname       = "memused_max",
 304                 .data           = NULL,
 305                 .maxlen         = 0,
 306                 .mode           = 0444,
 307                 .proc_handler   = &proc_mem_max
 308         },
 309         {
 310                 INIT_CTL_NAME
 311                 .procname       = "pagesused_max",
 312                 .data           = NULL,
 313                 .maxlen         = 0,
 314                 .mode           = 0444,
 315                 .proc_handler   = &proc_pages_max
 316         },
 317         {
 318                 INIT_CTL_NAME
 319                 .procname       = "ldlm_timeout",
 320                 .data           = &ldlm_timeout,
 321                 .maxlen         = sizeof(int),
 322                 .mode           = 0644,
 323                 .proc_handler   = &proc_set_timeout
 324         },
 325 #ifdef RANDOM_FAIL_ALLOC
 326         {
 327                 INIT_CTL_NAME
 328                 .procname       = "alloc_fail_rate",
 329                 .data           = &obd_alloc_fail_rate,
 330                 .maxlen         = sizeof(int),
 331                 .mode           = 0644,
 332                 .proc_handler   = &proc_alloc_fail_rate
 333         },
 334 #endif
 335         {
 336                 INIT_CTL_NAME
 337                 .procname       = "max_dirty_mb",
 338                 .data           = &obd_max_dirty_pages,
 339                 .maxlen         = sizeof(unsigned long),
 340                 .mode           = 0644,
 341                 .proc_handler   = &proc_max_dirty_pages_in_mb
 342         },
 343         {
 344                 INIT_CTL_NAME
 345                 .procname       = "bulk_timeout",
 346                 .data           = &bulk_timeout,
 347                 .maxlen         = sizeof(int),
 348                 .mode           = 0644,
 349                 .proc_handler   = &proc_dointvec
 350         },
 351         {
 352                 INIT_CTL_NAME
 353                 .procname       = "at_min",
 354                 .data           = &at_min,
 355                 .maxlen         = sizeof(int),
 356                 .mode           = 0644,
 357                 .proc_handler   = &proc_dointvec
 358         },
 359         {
 360                 INIT_CTL_NAME
 361                 .procname       = "at_max",
 362                 .data           = &at_max,
 363                 .maxlen         = sizeof(int),
 364                 .mode           = 0644,
 365                 .proc_handler   = &proc_dointvec
 366         },
 367         {
 368                 INIT_CTL_NAME
 369                 .procname       = "at_extra",
 370                 .data           = &at_extra,
 371                 .maxlen         = sizeof(int),
 372                 .mode           = 0644,
 373                 .proc_handler   = &proc_dointvec
 374         },
 375         {
 376                 INIT_CTL_NAME
 377                 .procname       = "at_early_margin",
 378                 .data           = &at_early_margin,
 379                 .maxlen         = sizeof(int),
 380                 .mode           = 0644,
 381                 .proc_handler   = &proc_dointvec
 382         },
 383         {
 384                 INIT_CTL_NAME
 385                 .procname       = "at_history",
 386                 .data           = &at_history,
 387                 .maxlen         = sizeof(int),
 388                 .mode           = 0644,
 389                 .proc_handler   = &proc_dointvec
 390         },
 391         { 0 }
 392 };
 393
 394 static struct ctl_table parent_table[] = {
 395         {
 396                 INIT_CTL_NAME
 397                 .procname       = "lustre",
 398                 .data           = NULL,
 399                 .maxlen         = 0,
 400                 .mode           = 0555,
 401                 .child          = obd_table
 402         },
 403         { 0 }
 404 };
 405 #endif
 406
 407 void obd_sysctl_init (void)
 408 {
 409 #ifdef CONFIG_SYSCTL
 410         if ( !obd_table_header )
 411                 obd_table_header = register_sysctl_table(parent_table);
 412 #endif
 413 }
 414
 415 void obd_sysctl_clean (void)
 416 {
 417 #ifdef CONFIG_SYSCTL
 418         if ( obd_table_header )
 419                 unregister_sysctl_table(obd_table_header);
 420         obd_table_header = NULL;
 421 #endif
 422 }