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 extern int get_locks_status (char *, char **, off_t, int);
  70
  71 static int proc_calc_metrics(char *page, char **start, off_t off,
  72                                  int count, int *eof, int len)
  73 {
  74         if (len <= off+count) *eof = 1;
  75         *start = page + off;
  76         len -= off;
  77         if (len>count) len = count;
  78         if (len<0) len = 0;
  79         return len;
  80 }
  81
  82 static int loadavg_read_proc(char *page, char **start, off_t off,
  83                                  int count, int *eof, void *data)
  84 {
  85         int a, b, c;
  86         int len;
  87
  88         a = avenrun[0] + (FIXED_1/200);
  89         b = avenrun[1] + (FIXED_1/200);
  90         c = avenrun[2] + (FIXED_1/200);
  91         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  92                 LOAD_INT(a), LOAD_FRAC(a),
  93                 LOAD_INT(b), LOAD_FRAC(b),
  94                 LOAD_INT(c), LOAD_FRAC(c),
  95                 nr_running(), nr_threads, current->nsproxy->pid_ns->last_pid);
  96         return proc_calc_metrics(page, start, off, count, eof, len);
  97 }
  98
  99 static int uptime_read_proc(char *page, char **start, off_t off,
 100                                  int count, int *eof, void *data)
 101 {
 102         struct timespec uptime;
 103         struct timespec idle;
 104         int len;
 105         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 106
 107         do_posix_clock_monotonic_gettime(&uptime);
 108         monotonic_to_bootbased(&uptime);
 109         cputime_to_timespec(idletime, &idle);
 110         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 111                         (unsigned long) uptime.tv_sec,
 112                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 113                         (unsigned long) idle.tv_sec,
 114                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 115
 116         return proc_calc_metrics(page, start, off, count, eof, len);
 117 }
 118
 119 static int meminfo_read_proc(char *page, char **start, off_t off,
 120                                  int count, int *eof, void *data)
 121 {
 122         struct sysinfo i;
 123         int len;
 124         unsigned long committed;
 125         unsigned long allowed;
 126         struct vmalloc_info vmi;
 127         long cached;
 128
 129 /*
 130  * display in kilobytes.
 131  */
 132 #define K(x) ((x) << (PAGE_SHIFT - 10))
 133         si_meminfo(&i);
 134         si_swapinfo(&i);
 135         committed = atomic_read(&vm_committed_space);
 136         allowed = ((totalram_pages - hugetlb_total_pages())
 137                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 138
 139         cached = global_page_state(NR_FILE_PAGES) -
 140                         total_swapcache_pages - i.bufferram;
 141         if (cached < 0)
 142                 cached = 0;
 143
 144         get_vmalloc_info(&vmi);
 145
 146         /*
 147          * Tagged format, for easy grepping and expansion.
 148          */
 149         len = sprintf(page,
 150                 "MemTotal:     %8lu kB\n"
 151                 "MemFree:      %8lu kB\n"
 152                 "Buffers:      %8lu kB\n"
 153                 "Cached:       %8lu kB\n"
 154                 "SwapCached:   %8lu kB\n"
 155                 "Active:       %8lu kB\n"
 156                 "Inactive:     %8lu kB\n"
 157 #ifdef CONFIG_HIGHMEM
 158                 "HighTotal:    %8lu kB\n"
 159                 "HighFree:     %8lu kB\n"
 160                 "LowTotal:     %8lu kB\n"
 161                 "LowFree:      %8lu kB\n"
 162 #endif
 163                 "SwapTotal:    %8lu kB\n"
 164                 "SwapFree:     %8lu kB\n"
 165                 "Dirty:        %8lu kB\n"
 166                 "Writeback:    %8lu kB\n"
 167                 "AnonPages:    %8lu kB\n"
 168                 "Mapped:       %8lu kB\n"
 169                 "Slab:         %8lu kB\n"
 170                 "SReclaimable: %8lu kB\n"
 171                 "SUnreclaim:   %8lu kB\n"
 172                 "PageTables:   %8lu kB\n"
 173                 "NFS_Unstable: %8lu kB\n"
 174                 "Bounce:       %8lu kB\n"
 175                 "CommitLimit:  %8lu kB\n"
 176                 "Committed_AS: %8lu kB\n"
 177                 "VmallocTotal: %8lu kB\n"
 178                 "VmallocUsed:  %8lu kB\n"
 179                 "VmallocChunk: %8lu kB\n",
 180                 K(i.totalram),
 181                 K(i.freeram),
 182                 K(i.bufferram),
 183                 K(cached),
 184                 K(total_swapcache_pages),
 185                 K(global_page_state(NR_ACTIVE)),
 186                 K(global_page_state(NR_INACTIVE)),
 187 #ifdef CONFIG_HIGHMEM
 188                 K(i.totalhigh),
 189                 K(i.freehigh),
 190                 K(i.totalram-i.totalhigh),
 191                 K(i.freeram-i.freehigh),
 192 #endif
 193                 K(i.totalswap),
 194                 K(i.freeswap),
 195                 K(global_page_state(NR_FILE_DIRTY)),
 196                 K(global_page_state(NR_WRITEBACK)),
 197                 K(global_page_state(NR_ANON_PAGES)),
 198                 K(global_page_state(NR_FILE_MAPPED)),
 199                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 200                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 201                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 202                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 203                 K(global_page_state(NR_PAGETABLE)),
 204                 K(global_page_state(NR_UNSTABLE_NFS)),
 205                 K(global_page_state(NR_BOUNCE)),
 206                 K(allowed),
 207                 K(committed),
 208                 (unsigned long)VMALLOC_TOTAL >> 10,
 209                 vmi.used >> 10,
 210                 vmi.largest_chunk >> 10
 211                 );
 212
 213                 len += hugetlb_report_meminfo(page + len);
 214
 215         return proc_calc_metrics(page, start, off, count, eof, len);
 216 #undef K
 217 }
 218
 219 extern struct seq_operations fragmentation_op;
 220 static int fragmentation_open(struct inode *inode, struct file *file)
 221 {
 222         (void)inode;
 223         return seq_open(file, &fragmentation_op);
 224 }
 225
 226 static const struct file_operations fragmentation_file_operations = {
 227         .open           = fragmentation_open,
 228         .read           = seq_read,
 229         .llseek         = seq_lseek,
 230         .release        = seq_release,
 231 };
 232
 233 extern struct seq_operations zoneinfo_op;
 234 static int zoneinfo_open(struct inode *inode, struct file *file)
 235 {
 236         return seq_open(file, &zoneinfo_op);
 237 }
 238
 239 static const struct file_operations proc_zoneinfo_file_operations = {
 240         .open           = zoneinfo_open,
 241         .read           = seq_read,
 242         .llseek         = seq_lseek,
 243         .release        = seq_release,
 244 };
 245
 246 static int version_read_proc(char *page, char **start, off_t off,
 247                                  int count, int *eof, void *data)
 248 {
 249         int len;
 250
 251         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 252                 utsname()->sysname,
 253                 utsname()->release,
 254                 utsname()->version);
 255         return proc_calc_metrics(page, start, off, count, eof, len);
 256 }
 257
 258 extern struct seq_operations cpuinfo_op;
 259 static int cpuinfo_open(struct inode *inode, struct file *file)
 260 {
 261         return seq_open(file, &cpuinfo_op);
 262 }
 263
 264 static const struct file_operations proc_cpuinfo_operations = {
 265         .open           = cpuinfo_open,
 266         .read           = seq_read,
 267         .llseek         = seq_lseek,
 268         .release        = seq_release,
 269 };
 270
 271 static int devinfo_show(struct seq_file *f, void *v)
 272 {
 273         int i = *(loff_t *) v;
 274
 275         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 276                 if (i == 0)
 277                         seq_printf(f, "Character devices:\n");
 278                 chrdev_show(f, i);
 279         }
 280 #ifdef CONFIG_BLOCK
 281         else {
 282                 i -= CHRDEV_MAJOR_HASH_SIZE;
 283                 if (i == 0)
 284                         seq_printf(f, "\nBlock devices:\n");
 285                 blkdev_show(f, i);
 286         }
 287 #endif
 288         return 0;
 289 }
 290
 291 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 292 {
 293         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 294                 return pos;
 295         return NULL;
 296 }
 297
 298 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 299 {
 300         (*pos)++;
 301         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 302                 return NULL;
 303         return pos;
 304 }
 305
 306 static void devinfo_stop(struct seq_file *f, void *v)
 307 {
 308         /* Nothing to do */
 309 }
 310
 311 static struct seq_operations devinfo_ops = {
 312         .start = devinfo_start,
 313         .next  = devinfo_next,
 314         .stop  = devinfo_stop,
 315         .show  = devinfo_show
 316 };
 317
 318 static int devinfo_open(struct inode *inode, struct file *filp)
 319 {
 320         return seq_open(filp, &devinfo_ops);
 321 }
 322
 323 static const struct file_operations proc_devinfo_operations = {
 324         .open           = devinfo_open,
 325         .read           = seq_read,
 326         .llseek         = seq_lseek,
 327         .release        = seq_release,
 328 };
 329
 330 extern struct seq_operations vmstat_op;
 331 static int vmstat_open(struct inode *inode, struct file *file)
 332 {
 333         return seq_open(file, &vmstat_op);
 334 }
 335 static const struct file_operations proc_vmstat_file_operations = {
 336         .open           = vmstat_open,
 337         .read           = seq_read,
 338         .llseek         = seq_lseek,
 339         .release        = seq_release,
 340 };
 341
 342 #ifdef CONFIG_PROC_HARDWARE
 343 static int hardware_read_proc(char *page, char **start, off_t off,
 344                                  int count, int *eof, void *data)
 345 {
 346         int len = get_hardware_list(page);
 347         return proc_calc_metrics(page, start, off, count, eof, len);
 348 }
 349 #endif
 350
 351 #ifdef CONFIG_STRAM_PROC
 352 static int stram_read_proc(char *page, char **start, off_t off,
 353                                  int count, int *eof, void *data)
 354 {
 355         int len = get_stram_list(page);
 356         return proc_calc_metrics(page, start, off, count, eof, len);
 357 }
 358 #endif
 359
 360 #ifdef CONFIG_BLOCK
 361 extern struct seq_operations partitions_op;
 362 static int partitions_open(struct inode *inode, struct file *file)
 363 {
 364         return seq_open(file, &partitions_op);
 365 }
 366 static const struct file_operations proc_partitions_operations = {
 367         .open           = partitions_open,
 368         .read           = seq_read,
 369         .llseek         = seq_lseek,
 370         .release        = seq_release,
 371 };
 372
 373 extern struct seq_operations diskstats_op;
 374 static int diskstats_open(struct inode *inode, struct file *file)
 375 {
 376         return seq_open(file, &diskstats_op);
 377 }
 378 static const struct file_operations proc_diskstats_operations = {
 379         .open           = diskstats_open,
 380         .read           = seq_read,
 381         .llseek         = seq_lseek,
 382         .release        = seq_release,
 383 };
 384 #endif
 385
 386 #ifdef CONFIG_MODULES
 387 extern struct seq_operations modules_op;
 388 static int modules_open(struct inode *inode, struct file *file)
 389 {
 390         return seq_open(file, &modules_op);
 391 }
 392 static const struct file_operations proc_modules_operations = {
 393         .open           = modules_open,
 394         .read           = seq_read,
 395         .llseek         = seq_lseek,
 396         .release        = seq_release,
 397 };
 398 #endif
 399
 400 #ifdef CONFIG_SLAB
 401 static int slabinfo_open(struct inode *inode, struct file *file)
 402 {
 403         return seq_open(file, &slabinfo_op);
 404 }
 405 static const struct file_operations proc_slabinfo_operations = {
 406         .open           = slabinfo_open,
 407         .read           = seq_read,
 408         .write          = slabinfo_write,
 409         .llseek         = seq_lseek,
 410         .release        = seq_release,
 411 };
 412
 413 #ifdef CONFIG_DEBUG_SLAB_LEAK
 414 extern struct seq_operations slabstats_op;
 415 static int slabstats_open(struct inode *inode, struct file *file)
 416 {
 417         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 418         int ret = -ENOMEM;
 419         if (n) {
 420                 ret = seq_open(file, &slabstats_op);
 421                 if (!ret) {
 422                         struct seq_file *m = file->private_data;
 423                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 424                         m->private = n;
 425                         n = NULL;
 426                 }
 427                 kfree(n);
 428         }
 429         return ret;
 430 }
 431
 432 static const struct file_operations proc_slabstats_operations = {
 433         .open           = slabstats_open,
 434         .read           = seq_read,
 435         .llseek         = seq_lseek,
 436         .release        = seq_release_private,
 437 };
 438 #endif
 439 #endif
 440
 441 static int show_stat(struct seq_file *p, void *v)
 442 {
 443         int i;
 444         unsigned long jif;
 445         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 446         u64 sum = 0;
 447         struct timespec boottime;
 448         unsigned int *per_irq_sum;
 449
 450         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 451         if (!per_irq_sum)
 452                 return -ENOMEM;
 453
 454         user = nice = system = idle = iowait =
 455                 irq = softirq = steal = cputime64_zero;
 456         getboottime(&boottime);
 457         jif = boottime.tv_sec;
 458
 459         for_each_possible_cpu(i) {
 460                 int j;
 461
 462                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 463                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 464                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 465                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 466                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 467                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 468                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 469                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 470                 for (j = 0; j < NR_IRQS; j++) {
 471                         unsigned int temp = kstat_cpu(i).irqs[j];
 472                         sum += temp;
 473                         per_irq_sum[j] += temp;
 474                 }
 475         }
 476
 477         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 478                 (unsigned long long)cputime64_to_clock_t(user),
 479                 (unsigned long long)cputime64_to_clock_t(nice),
 480                 (unsigned long long)cputime64_to_clock_t(system),
 481                 (unsigned long long)cputime64_to_clock_t(idle),
 482                 (unsigned long long)cputime64_to_clock_t(iowait),
 483                 (unsigned long long)cputime64_to_clock_t(irq),
 484                 (unsigned long long)cputime64_to_clock_t(softirq),
 485                 (unsigned long long)cputime64_to_clock_t(steal));
 486         for_each_online_cpu(i) {
 487
 488                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 489                 user = kstat_cpu(i).cpustat.user;
 490                 nice = kstat_cpu(i).cpustat.nice;
 491                 system = kstat_cpu(i).cpustat.system;
 492                 idle = kstat_cpu(i).cpustat.idle;
 493                 iowait = kstat_cpu(i).cpustat.iowait;
 494                 irq = kstat_cpu(i).cpustat.irq;
 495                 softirq = kstat_cpu(i).cpustat.softirq;
 496                 steal = kstat_cpu(i).cpustat.steal;
 497                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 498                         i,
 499                         (unsigned long long)cputime64_to_clock_t(user),
 500                         (unsigned long long)cputime64_to_clock_t(nice),
 501                         (unsigned long long)cputime64_to_clock_t(system),
 502                         (unsigned long long)cputime64_to_clock_t(idle),
 503                         (unsigned long long)cputime64_to_clock_t(iowait),
 504                         (unsigned long long)cputime64_to_clock_t(irq),
 505                         (unsigned long long)cputime64_to_clock_t(softirq),
 506                         (unsigned long long)cputime64_to_clock_t(steal));
 507         }
 508         seq_printf(p, "intr %llu", (unsigned long long)sum);
 509
 510 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
 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_read_proc(char *page, char **start, off_t off,
 620                                  int count, int *eof, void *data)
 621 {
 622         int len = get_locks_status(page, start, off, count);
 623
 624         if (len < count)
 625                 *eof = 1;
 626         return len;
 627 }
 628
 629 static int execdomains_read_proc(char *page, char **start, off_t off,
 630                                  int count, int *eof, void *data)
 631 {
 632         int len = get_exec_domain_list(page);
 633         return proc_calc_metrics(page, start, off, count, eof, len);
 634 }
 635
 636 #ifdef CONFIG_MAGIC_SYSRQ
 637 /*
 638  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 639  */
 640 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 641                                    size_t count, loff_t *ppos)
 642 {
 643         if (count) {
 644                 char c;
 645
 646                 if (get_user(c, buf))
 647                         return -EFAULT;
 648                 __handle_sysrq(c, NULL, 0);
 649         }
 650         return count;
 651 }
 652
 653 static const struct file_operations proc_sysrq_trigger_operations = {
 654         .write          = write_sysrq_trigger,
 655 };
 656 #endif
 657
 658 struct proc_dir_entry *proc_root_kcore;
 659
 660 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 661 {
 662         struct proc_dir_entry *entry;
 663         entry = create_proc_entry(name, mode, NULL);
 664         if (entry)
 665                 entry->proc_fops = f;
 666 }
 667
 668 void __init proc_misc_init(void)
 669 {
 670         static struct {
 671                 char *name;
 672                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 673         } *p, simple_ones[] = {
 674                 {"loadavg",     loadavg_read_proc},
 675                 {"uptime",      uptime_read_proc},
 676                 {"meminfo",     meminfo_read_proc},
 677                 {"version",     version_read_proc},
 678 #ifdef CONFIG_PROC_HARDWARE
 679                 {"hardware",    hardware_read_proc},
 680 #endif
 681 #ifdef CONFIG_STRAM_PROC
 682                 {"stram",       stram_read_proc},
 683 #endif
 684                 {"filesystems", filesystems_read_proc},
 685                 {"cmdline",     cmdline_read_proc},
 686                 {"locks",       locks_read_proc},
 687                 {"execdomains", execdomains_read_proc},
 688                 {NULL,}
 689         };
 690         for (p = simple_ones; p->name; p++)
 691                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 692
 693         proc_symlink("mounts", NULL, "self/mounts");
 694
 695         /* And now for trickier ones */
 696 #ifdef CONFIG_PRINTK
 697         {
 698                 struct proc_dir_entry *entry;
 699                 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 700                 if (entry)
 701                         entry->proc_fops = &proc_kmsg_operations;
 702         }
 703 #endif
 704         create_seq_entry("devices", 0, &proc_devinfo_operations);
 705         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 706 #ifdef CONFIG_BLOCK
 707         create_seq_entry("partitions", 0, &proc_partitions_operations);
 708 #endif
 709         create_seq_entry("stat", 0, &proc_stat_operations);
 710         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 711 #ifdef CONFIG_SLAB
 712         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 713 #ifdef CONFIG_DEBUG_SLAB_LEAK
 714         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 715 #endif
 716 #endif
 717         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 718         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 719         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
 720 #ifdef CONFIG_BLOCK
 721         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 722 #endif
 723 #ifdef CONFIG_MODULES
 724         create_seq_entry("modules", 0, &proc_modules_operations);
 725 #endif
 726 #ifdef CONFIG_SCHEDSTATS
 727         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 728 #endif
 729 #ifdef CONFIG_PROC_KCORE
 730         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 731         if (proc_root_kcore) {
 732                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 733                 proc_root_kcore->size =
 734                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 735         }
 736 #endif
 737 #ifdef CONFIG_PROC_VMCORE
 738         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
 739         if (proc_vmcore)
 740                 proc_vmcore->proc_fops = &proc_vmcore_operations;
 741 #endif
 742 #ifdef CONFIG_MAGIC_SYSRQ
 743         {
 744                 struct proc_dir_entry *entry;
 745                 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 746                 if (entry)
 747                         entry->proc_fops = &proc_sysrq_trigger_operations;
 748         }
 749 #endif
 750 }