fs/proc/proc_misc.c

   1 /*
   2  *  linux/fs/proc/proc_misc.c
   3  *
   4  *  linux/fs/proc/array.c
   5  *  Copyright (C) 1992  by Linus Torvalds
   6  *  based on ideas by Darren Senn
   7  *
   8  *  This used to be the part of array.c. See the rest of history and credits
   9  *  there. I took this into a separate file and switched the thing to generic
  10  *  proc_file_inode_operations, leaving in array.c only per-process stuff.
  11  *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
  12  *
  13  * Changes:
  14  * Fulton Green      :  Encapsulated position metric calculations.
  15  *                      <kernel@FultonGreen.com>
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/time.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/fs.h>
  24 #include <linux/tty.h>
  25 #include <linux/string.h>
  26 #include <linux/mman.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/ioport.h>
  29 #include <linux/mm.h>
  30 #include <linux/mmzone.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/swap.h>
  33 #include <linux/slab.h>
  34 #include <linux/smp.h>
  35 #include <linux/signal.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/times.h>
  40 #include <linux/profile.h>
  41 #include <linux/utsname.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/hugetlb.h>
  44 #include <linux/jiffies.h>
  45 #include <linux/sysrq.h>
  46 #include <linux/vmalloc.h>
  47 #include <linux/crash_dump.h>
  48 #include <linux/pid_namespace.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/io.h>
  52 #include <asm/tlb.h>
  53 #include <asm/div64.h>
  54 #include "internal.h"
  55
  56 #define LOAD_INT(x) ((x) >> FSHIFT)
  57 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  58 /*
  59  * Warning: stuff below (imported functions) assumes that its output will fit
  60  * into one page. For some of those functions it may be wrong. Moreover, we
  61  * have a way to deal with that gracefully. Right now I used straightforward
  62  * wrappers, but this needs further analysis wrt potential overflows.
  63  */
  64 extern int get_hardware_list(char *);
  65 extern int get_stram_list(char *);
  66 extern int get_filesystem_list(char *);
  67 extern int get_exec_domain_list(char *);
  68 extern int get_dma_list(char *);
  69
  70 static int proc_calc_metrics(char *page, char **start, off_t off,
  71                                  int count, int *eof, int len)
  72 {
  73         if (len <= off+count) *eof = 1;
  74         *start = page + off;
  75         len -= off;
  76         if (len>count) len = count;
  77         if (len<0) len = 0;
  78         return len;
  79 }
  80
  81 static int loadavg_read_proc(char *page, char **start, off_t off,
  82                                  int count, int *eof, void *data)
  83 {
  84         int a, b, c;
  85         int len;
  86
  87         a = avenrun[0] + (FIXED_1/200);
  88         b = avenrun[1] + (FIXED_1/200);
  89         c = avenrun[2] + (FIXED_1/200);
  90         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  91                 LOAD_INT(a), LOAD_FRAC(a),
  92                 LOAD_INT(b), LOAD_FRAC(b),
  93                 LOAD_INT(c), LOAD_FRAC(c),
  94                 nr_running(), nr_threads, current->nsproxy->pid_ns->last_pid);
  95         return proc_calc_metrics(page, start, off, count, eof, len);
  96 }
  97
  98 static int uptime_read_proc(char *page, char **start, off_t off,
  99                                  int count, int *eof, void *data)
 100 {
 101         struct timespec uptime;
 102         struct timespec idle;
 103         int len;
 104         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 105
 106         do_posix_clock_monotonic_gettime(&uptime);
 107         monotonic_to_bootbased(&uptime);
 108         cputime_to_timespec(idletime, &idle);
 109         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 110                         (unsigned long) uptime.tv_sec,
 111                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 112                         (unsigned long) idle.tv_sec,
 113                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 114
 115         return proc_calc_metrics(page, start, off, count, eof, len);
 116 }
 117
 118 static int meminfo_read_proc(char *page, char **start, off_t off,
 119                                  int count, int *eof, void *data)
 120 {
 121         struct sysinfo i;
 122         int len;
 123         unsigned long committed;
 124         unsigned long allowed;
 125         struct vmalloc_info vmi;
 126         long cached;
 127
 128 /*
 129  * display in kilobytes.
 130  */
 131 #define K(x) ((x) << (PAGE_SHIFT - 10))
 132         si_meminfo(&i);
 133         si_swapinfo(&i);
 134         committed = atomic_read(&vm_committed_space);
 135         allowed = ((totalram_pages - hugetlb_total_pages())
 136                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 137
 138         cached = global_page_state(NR_FILE_PAGES) -
 139                         total_swapcache_pages - i.bufferram;
 140         if (cached < 0)
 141                 cached = 0;
 142
 143         get_vmalloc_info(&vmi);
 144
 145         /*
 146          * Tagged format, for easy grepping and expansion.
 147          */
 148         len = sprintf(page,
 149                 "MemTotal:     %8lu kB\n"
 150                 "MemFree:      %8lu kB\n"
 151                 "Buffers:      %8lu kB\n"
 152                 "Cached:       %8lu kB\n"
 153                 "SwapCached:   %8lu kB\n"
 154                 "Active:       %8lu kB\n"
 155                 "Inactive:     %8lu kB\n"
 156 #ifdef CONFIG_HIGHMEM
 157                 "HighTotal:    %8lu kB\n"
 158                 "HighFree:     %8lu kB\n"
 159                 "LowTotal:     %8lu kB\n"
 160                 "LowFree:      %8lu kB\n"
 161 #endif
 162                 "SwapTotal:    %8lu kB\n"
 163                 "SwapFree:     %8lu kB\n"
 164                 "Dirty:        %8lu kB\n"
 165                 "Writeback:    %8lu kB\n"
 166                 "AnonPages:    %8lu kB\n"
 167                 "Mapped:       %8lu kB\n"
 168                 "Slab:         %8lu kB\n"
 169                 "SReclaimable: %8lu kB\n"
 170                 "SUnreclaim:   %8lu kB\n"
 171                 "PageTables:   %8lu kB\n"
 172                 "NFS_Unstable: %8lu kB\n"
 173                 "Bounce:       %8lu kB\n"
 174                 "CommitLimit:  %8lu kB\n"
 175                 "Committed_AS: %8lu kB\n"
 176                 "VmallocTotal: %8lu kB\n"
 177                 "VmallocUsed:  %8lu kB\n"
 178                 "VmallocChunk: %8lu kB\n",
 179                 K(i.totalram),
 180                 K(i.freeram),
 181                 K(i.bufferram),
 182                 K(cached),
 183                 K(total_swapcache_pages),
 184                 K(global_page_state(NR_ACTIVE)),
 185                 K(global_page_state(NR_INACTIVE)),
 186 #ifdef CONFIG_HIGHMEM
 187                 K(i.totalhigh),
 188                 K(i.freehigh),
 189                 K(i.totalram-i.totalhigh),
 190                 K(i.freeram-i.freehigh),
 191 #endif
 192                 K(i.totalswap),
 193                 K(i.freeswap),
 194                 K(global_page_state(NR_FILE_DIRTY)),
 195                 K(global_page_state(NR_WRITEBACK)),
 196                 K(global_page_state(NR_ANON_PAGES)),
 197                 K(global_page_state(NR_FILE_MAPPED)),
 198                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 199                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 200                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 201                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 202                 K(global_page_state(NR_PAGETABLE)),
 203                 K(global_page_state(NR_UNSTABLE_NFS)),
 204                 K(global_page_state(NR_BOUNCE)),
 205                 K(allowed),
 206                 K(committed),
 207                 (unsigned long)VMALLOC_TOTAL >> 10,
 208                 vmi.used >> 10,
 209                 vmi.largest_chunk >> 10
 210                 );
 211
 212                 len += hugetlb_report_meminfo(page + len);
 213
 214         return proc_calc_metrics(page, start, off, count, eof, len);
 215 #undef K
 216 }
 217
 218 extern struct seq_operations fragmentation_op;
 219 static int fragmentation_open(struct inode *inode, struct file *file)
 220 {
 221         (void)inode;
 222         return seq_open(file, &fragmentation_op);
 223 }
 224
 225 static const struct file_operations fragmentation_file_operations = {
 226         .open           = fragmentation_open,
 227         .read           = seq_read,
 228         .llseek         = seq_lseek,
 229         .release        = seq_release,
 230 };
 231
 232 extern struct seq_operations zoneinfo_op;
 233 static int zoneinfo_open(struct inode *inode, struct file *file)
 234 {
 235         return seq_open(file, &zoneinfo_op);
 236 }
 237
 238 static const struct file_operations proc_zoneinfo_file_operations = {
 239         .open           = zoneinfo_open,
 240         .read           = seq_read,
 241         .llseek         = seq_lseek,
 242         .release        = seq_release,
 243 };
 244
 245 static int version_read_proc(char *page, char **start, off_t off,
 246                                  int count, int *eof, void *data)
 247 {
 248         int len;
 249
 250         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 251                 utsname()->sysname,
 252                 utsname()->release,
 253                 utsname()->version);
 254         return proc_calc_metrics(page, start, off, count, eof, len);
 255 }
 256
 257 extern struct seq_operations cpuinfo_op;
 258 static int cpuinfo_open(struct inode *inode, struct file *file)
 259 {
 260         return seq_open(file, &cpuinfo_op);
 261 }
 262
 263 static const struct file_operations proc_cpuinfo_operations = {
 264         .open           = cpuinfo_open,
 265         .read           = seq_read,
 266         .llseek         = seq_lseek,
 267         .release        = seq_release,
 268 };
 269
 270 static int devinfo_show(struct seq_file *f, void *v)
 271 {
 272         int i = *(loff_t *) v;
 273
 274         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 275                 if (i == 0)
 276                         seq_printf(f, "Character devices:\n");
 277                 chrdev_show(f, i);
 278         }
 279 #ifdef CONFIG_BLOCK
 280         else {
 281                 i -= CHRDEV_MAJOR_HASH_SIZE;
 282                 if (i == 0)
 283                         seq_printf(f, "\nBlock devices:\n");
 284                 blkdev_show(f, i);
 285         }
 286 #endif
 287         return 0;
 288 }
 289
 290 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 291 {
 292         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 293                 return pos;
 294         return NULL;
 295 }
 296
 297 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 298 {
 299         (*pos)++;
 300         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 301                 return NULL;
 302         return pos;
 303 }
 304
 305 static void devinfo_stop(struct seq_file *f, void *v)
 306 {
 307         /* Nothing to do */
 308 }
 309
 310 static struct seq_operations devinfo_ops = {
 311         .start = devinfo_start,
 312         .next  = devinfo_next,
 313         .stop  = devinfo_stop,
 314         .show  = devinfo_show
 315 };
 316
 317 static int devinfo_open(struct inode *inode, struct file *filp)
 318 {
 319         return seq_open(filp, &devinfo_ops);
 320 }
 321
 322 static const struct file_operations proc_devinfo_operations = {
 323         .open           = devinfo_open,
 324         .read           = seq_read,
 325         .llseek         = seq_lseek,
 326         .release        = seq_release,
 327 };
 328
 329 extern struct seq_operations vmstat_op;
 330 static int vmstat_open(struct inode *inode, struct file *file)
 331 {
 332         return seq_open(file, &vmstat_op);
 333 }
 334 static const struct file_operations proc_vmstat_file_operations = {
 335         .open           = vmstat_open,
 336         .read           = seq_read,
 337         .llseek         = seq_lseek,
 338         .release        = seq_release,
 339 };
 340
 341 #ifdef CONFIG_PROC_HARDWARE
 342 static int hardware_read_proc(char *page, char **start, off_t off,
 343                                  int count, int *eof, void *data)
 344 {
 345         int len = get_hardware_list(page);
 346         return proc_calc_metrics(page, start, off, count, eof, len);
 347 }
 348 #endif
 349
 350 #ifdef CONFIG_STRAM_PROC
 351 static int stram_read_proc(char *page, char **start, off_t off,
 352                                  int count, int *eof, void *data)
 353 {
 354         int len = get_stram_list(page);
 355         return proc_calc_metrics(page, start, off, count, eof, len);
 356 }
 357 #endif
 358
 359 #ifdef CONFIG_BLOCK
 360 extern struct seq_operations partitions_op;
 361 static int partitions_open(struct inode *inode, struct file *file)
 362 {
 363         return seq_open(file, &partitions_op);
 364 }
 365 static const struct file_operations proc_partitions_operations = {
 366         .open           = partitions_open,
 367         .read           = seq_read,
 368         .llseek         = seq_lseek,
 369         .release        = seq_release,
 370 };
 371
 372 extern struct seq_operations diskstats_op;
 373 static int diskstats_open(struct inode *inode, struct file *file)
 374 {
 375         return seq_open(file, &diskstats_op);
 376 }
 377 static const struct file_operations proc_diskstats_operations = {
 378         .open           = diskstats_open,
 379         .read           = seq_read,
 380         .llseek         = seq_lseek,
 381         .release        = seq_release,
 382 };
 383 #endif
 384
 385 #ifdef CONFIG_MODULES
 386 extern struct seq_operations modules_op;
 387 static int modules_open(struct inode *inode, struct file *file)
 388 {
 389         return seq_open(file, &modules_op);
 390 }
 391 static const struct file_operations proc_modules_operations = {
 392         .open           = modules_open,
 393         .read           = seq_read,
 394         .llseek         = seq_lseek,
 395         .release        = seq_release,
 396 };
 397 #endif
 398
 399 #ifdef CONFIG_SLAB
 400 static int slabinfo_open(struct inode *inode, struct file *file)
 401 {
 402         return seq_open(file, &slabinfo_op);
 403 }
 404 static const struct file_operations proc_slabinfo_operations = {
 405         .open           = slabinfo_open,
 406         .read           = seq_read,
 407         .write          = slabinfo_write,
 408         .llseek         = seq_lseek,
 409         .release        = seq_release,
 410 };
 411
 412 #ifdef CONFIG_DEBUG_SLAB_LEAK
 413 extern struct seq_operations slabstats_op;
 414 static int slabstats_open(struct inode *inode, struct file *file)
 415 {
 416         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 417         int ret = -ENOMEM;
 418         if (n) {
 419                 ret = seq_open(file, &slabstats_op);
 420                 if (!ret) {
 421                         struct seq_file *m = file->private_data;
 422                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 423                         m->private = n;
 424                         n = NULL;
 425                 }
 426                 kfree(n);
 427         }
 428         return ret;
 429 }
 430
 431 static const struct file_operations proc_slabstats_operations = {
 432         .open           = slabstats_open,
 433         .read           = seq_read,
 434         .llseek         = seq_lseek,
 435         .release        = seq_release_private,
 436 };
 437 #endif
 438 #endif
 439
 440 static int show_stat(struct seq_file *p, void *v)
 441 {
 442         int i;
 443         unsigned long jif;
 444         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 445         u64 sum = 0;
 446         struct timespec boottime;
 447         unsigned int *per_irq_sum;
 448
 449         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 450         if (!per_irq_sum)
 451                 return -ENOMEM;
 452
 453         user = nice = system = idle = iowait =
 454                 irq = softirq = steal = cputime64_zero;
 455         getboottime(&boottime);
 456         jif = boottime.tv_sec;
 457
 458         for_each_possible_cpu(i) {
 459                 int j;
 460
 461                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 462                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 463                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 464                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 465                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 466                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 467                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 468                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 469                 for (j = 0; j < NR_IRQS; j++) {
 470                         unsigned int temp = kstat_cpu(i).irqs[j];
 471                         sum += temp;
 472                         per_irq_sum[j] += temp;
 473                 }
 474         }
 475
 476         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 477                 (unsigned long long)cputime64_to_clock_t(user),
 478                 (unsigned long long)cputime64_to_clock_t(nice),
 479                 (unsigned long long)cputime64_to_clock_t(system),
 480                 (unsigned long long)cputime64_to_clock_t(idle),
 481                 (unsigned long long)cputime64_to_clock_t(iowait),
 482                 (unsigned long long)cputime64_to_clock_t(irq),
 483                 (unsigned long long)cputime64_to_clock_t(softirq),
 484                 (unsigned long long)cputime64_to_clock_t(steal));
 485         for_each_online_cpu(i) {
 486
 487                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 488                 user = kstat_cpu(i).cpustat.user;
 489                 nice = kstat_cpu(i).cpustat.nice;
 490                 system = kstat_cpu(i).cpustat.system;
 491                 idle = kstat_cpu(i).cpustat.idle;
 492                 iowait = kstat_cpu(i).cpustat.iowait;
 493                 irq = kstat_cpu(i).cpustat.irq;
 494                 softirq = kstat_cpu(i).cpustat.softirq;
 495                 steal = kstat_cpu(i).cpustat.steal;
 496                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 497                         i,
 498                         (unsigned long long)cputime64_to_clock_t(user),
 499                         (unsigned long long)cputime64_to_clock_t(nice),
 500                         (unsigned long long)cputime64_to_clock_t(system),
 501                         (unsigned long long)cputime64_to_clock_t(idle),
 502                         (unsigned long long)cputime64_to_clock_t(iowait),
 503                         (unsigned long long)cputime64_to_clock_t(irq),
 504                         (unsigned long long)cputime64_to_clock_t(softirq),
 505                         (unsigned long long)cputime64_to_clock_t(steal));
 506         }
 507         seq_printf(p, "intr %llu", (unsigned long long)sum);
 508
 509 #ifndef CONFIG_SMP
 510         /* Touches too many cache lines on SMP setups */
 511         for (i = 0; i < NR_IRQS; i++)
 512                 seq_printf(p, " %u", per_irq_sum[i]);
 513 #endif
 514
 515         seq_printf(p,
 516                 "\nctxt %llu\n"
 517                 "btime %lu\n"
 518                 "processes %lu\n"
 519                 "procs_running %lu\n"
 520                 "procs_blocked %lu\n",
 521                 nr_context_switches(),
 522                 (unsigned long)jif,
 523                 total_forks,
 524                 nr_running(),
 525                 nr_iowait());
 526
 527         kfree(per_irq_sum);
 528         return 0;
 529 }
 530
 531 static int stat_open(struct inode *inode, struct file *file)
 532 {
 533         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 534         char *buf;
 535         struct seq_file *m;
 536         int res;
 537
 538         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 539         if (size > 128 * 1024)
 540                 size = 128 * 1024;
 541         buf = kmalloc(size, GFP_KERNEL);
 542         if (!buf)
 543                 return -ENOMEM;
 544
 545         res = single_open(file, show_stat, NULL);
 546         if (!res) {
 547                 m = file->private_data;
 548                 m->buf = buf;
 549                 m->size = size;
 550         } else
 551                 kfree(buf);
 552         return res;
 553 }
 554 static const struct file_operations proc_stat_operations = {
 555         .open           = stat_open,
 556         .read           = seq_read,
 557         .llseek         = seq_lseek,
 558         .release        = single_release,
 559 };
 560
 561 /*
 562  * /proc/interrupts
 563  */
 564 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 565 {
 566         return (*pos <= NR_IRQS) ? pos : NULL;
 567 }
 568
 569 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 570 {
 571         (*pos)++;
 572         if (*pos > NR_IRQS)
 573                 return NULL;
 574         return pos;
 575 }
 576
 577 static void int_seq_stop(struct seq_file *f, void *v)
 578 {
 579         /* Nothing to do */
 580 }
 581
 582
 583 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 584 static struct seq_operations int_seq_ops = {
 585         .start = int_seq_start,
 586         .next  = int_seq_next,
 587         .stop  = int_seq_stop,
 588         .show  = show_interrupts
 589 };
 590
 591 static int interrupts_open(struct inode *inode, struct file *filp)
 592 {
 593         return seq_open(filp, &int_seq_ops);
 594 }
 595
 596 static const struct file_operations proc_interrupts_operations = {
 597         .open           = interrupts_open,
 598         .read           = seq_read,
 599         .llseek         = seq_lseek,
 600         .release        = seq_release,
 601 };
 602
 603 static int filesystems_read_proc(char *page, char **start, off_t off,
 604                                  int count, int *eof, void *data)
 605 {
 606         int len = get_filesystem_list(page);
 607         return proc_calc_metrics(page, start, off, count, eof, len);
 608 }
 609
 610 static int cmdline_read_proc(char *page, char **start, off_t off,
 611                                  int count, int *eof, void *data)
 612 {
 613         int len;
 614
 615         len = sprintf(page, "%s\n", saved_command_line);
 616         return proc_calc_metrics(page, start, off, count, eof, len);
 617 }
 618
 619 static int locks_open(struct inode *inode, struct file *filp)
 620 {
 621         return seq_open(filp, &locks_seq_operations);
 622 }
 623
 624 static const struct file_operations proc_locks_operations = {
 625         .open           = locks_open,
 626         .read           = seq_read,
 627         .llseek         = seq_lseek,
 628         .release        = seq_release,
 629 };
 630
 631 static int execdomains_read_proc(char *page, char **start, off_t off,
 632                                  int count, int *eof, void *data)
 633 {
 634         int len = get_exec_domain_list(page);
 635         return proc_calc_metrics(page, start, off, count, eof, len);
 636 }
 637
 638 #ifdef CONFIG_MAGIC_SYSRQ
 639 /*
 640  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 641  */
 642 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 643                                    size_t count, loff_t *ppos)
 644 {
 645         if (count) {
 646                 char c;
 647
 648                 if (get_user(c, buf))
 649                         return -EFAULT;
 650                 __handle_sysrq(c, NULL, 0);
 651         }
 652         return count;
 653 }
 654
 655 static const struct file_operations proc_sysrq_trigger_operations = {
 656         .write          = write_sysrq_trigger,
 657 };
 658 #endif
 659
 660 struct proc_dir_entry *proc_root_kcore;
 661
 662 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 663 {
 664         struct proc_dir_entry *entry;
 665         entry = create_proc_entry(name, mode, NULL);
 666         if (entry)
 667                 entry->proc_fops = f;
 668 }
 669
 670 void __init proc_misc_init(void)
 671 {
 672         static struct {
 673                 char *name;
 674                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 675         } *p, simple_ones[] = {
 676                 {"loadavg",     loadavg_read_proc},
 677                 {"uptime",      uptime_read_proc},
 678                 {"meminfo",     meminfo_read_proc},
 679                 {"version",     version_read_proc},
 680 #ifdef CONFIG_PROC_HARDWARE
 681                 {"hardware",    hardware_read_proc},
 682 #endif
 683 #ifdef CONFIG_STRAM_PROC
 684                 {"stram",       stram_read_proc},
 685 #endif
 686                 {"filesystems", filesystems_read_proc},
 687                 {"cmdline",     cmdline_read_proc},
 688                 {"execdomains", execdomains_read_proc},
 689                 {NULL,}
 690         };
 691         for (p = simple_ones; p->name; p++)
 692                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 693
 694         proc_symlink("mounts", NULL, "self/mounts");
 695
 696         /* And now for trickier ones */
 697 #ifdef CONFIG_PRINTK
 698         {
 699                 struct proc_dir_entry *entry;
 700                 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 701                 if (entry)
 702                         entry->proc_fops = &proc_kmsg_operations;
 703         }
 704 #endif
 705         create_seq_entry("locks", 0, &proc_locks_operations);
 706         create_seq_entry("devices", 0, &proc_devinfo_operations);
 707         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 708 #ifdef CONFIG_BLOCK
 709         create_seq_entry("partitions", 0, &proc_partitions_operations);
 710 #endif
 711         create_seq_entry("stat", 0, &proc_stat_operations);
 712         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 713 #ifdef CONFIG_SLAB
 714         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 715 #ifdef CONFIG_DEBUG_SLAB_LEAK
 716         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 717 #endif
 718 #endif
 719         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 720         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 721         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
 722 #ifdef CONFIG_BLOCK
 723         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 724 #endif
 725 #ifdef CONFIG_MODULES
 726         create_seq_entry("modules", 0, &proc_modules_operations);
 727 #endif
 728 #ifdef CONFIG_SCHEDSTATS
 729         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 730 #endif
 731 #ifdef CONFIG_PROC_KCORE
 732         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 733         if (proc_root_kcore) {
 734                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 735                 proc_root_kcore->size =
 736                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 737         }
 738 #endif
 739 #ifdef CONFIG_PROC_VMCORE
 740         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
 741         if (proc_vmcore)
 742                 proc_vmcore->proc_fops = &proc_vmcore_operations;
 743 #endif
 744 #ifdef CONFIG_MAGIC_SYSRQ
 745         {
 746                 struct proc_dir_entry *entry;
 747                 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 748                 if (entry)
 749                         entry->proc_fops = &proc_sysrq_trigger_operations;
 750         }
 751 #endif
 752 }