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/smp_lock.h>
  39 #include <linux/seq_file.h>
  40 #include <linux/times.h>
  41 #include <linux/profile.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/pspace.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, init_pspace.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         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 inactive;
 124         unsigned long active;
 125         unsigned long free;
 126         unsigned long committed;
 127         unsigned long allowed;
 128         struct vmalloc_info vmi;
 129         long cached;
 130
 131         get_zone_counts(&active, &inactive, &free);
 132
 133 /*
 134  * display in kilobytes.
 135  */
 136 #define K(x) ((x) << (PAGE_SHIFT - 10))
 137         si_meminfo(&i);
 138         si_swapinfo(&i);
 139         committed = atomic_read(&vm_committed_space);
 140         allowed = ((totalram_pages - hugetlb_total_pages())
 141                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 142
 143         cached = global_page_state(NR_FILE_PAGES) -
 144                         total_swapcache_pages - i.bufferram;
 145         if (cached < 0)
 146                 cached = 0;
 147
 148         get_vmalloc_info(&vmi);
 149
 150         /*
 151          * Tagged format, for easy grepping and expansion.
 152          */
 153         len = sprintf(page,
 154                 "MemTotal:     %8lu kB\n"
 155                 "MemFree:      %8lu kB\n"
 156                 "Buffers:      %8lu kB\n"
 157                 "Cached:       %8lu kB\n"
 158                 "SwapCached:   %8lu kB\n"
 159                 "Active:       %8lu kB\n"
 160                 "Inactive:     %8lu kB\n"
 161 #ifdef CONFIG_HIGHMEM
 162                 "HighTotal:    %8lu kB\n"
 163                 "HighFree:     %8lu kB\n"
 164                 "LowTotal:     %8lu kB\n"
 165                 "LowFree:      %8lu kB\n"
 166 #endif
 167                 "SwapTotal:    %8lu kB\n"
 168                 "SwapFree:     %8lu kB\n"
 169                 "Dirty:        %8lu kB\n"
 170                 "Writeback:    %8lu kB\n"
 171                 "AnonPages:    %8lu kB\n"
 172                 "Mapped:       %8lu kB\n"
 173                 "Slab:         %8lu kB\n"
 174                 "SReclaimable: %8lu kB\n"
 175                 "SUnreclaim:   %8lu kB\n"
 176                 "PageTables:   %8lu kB\n"
 177                 "NFS_Unstable: %8lu kB\n"
 178                 "Bounce:       %8lu kB\n"
 179                 "CommitLimit:  %8lu kB\n"
 180                 "Committed_AS: %8lu kB\n"
 181                 "VmallocTotal: %8lu kB\n"
 182                 "VmallocUsed:  %8lu kB\n"
 183                 "VmallocChunk: %8lu kB\n",
 184                 K(i.totalram),
 185                 K(i.freeram),
 186                 K(i.bufferram),
 187                 K(cached),
 188                 K(total_swapcache_pages),
 189                 K(active),
 190                 K(inactive),
 191 #ifdef CONFIG_HIGHMEM
 192                 K(i.totalhigh),
 193                 K(i.freehigh),
 194                 K(i.totalram-i.totalhigh),
 195                 K(i.freeram-i.freehigh),
 196 #endif
 197                 K(i.totalswap),
 198                 K(i.freeswap),
 199                 K(global_page_state(NR_FILE_DIRTY)),
 200                 K(global_page_state(NR_WRITEBACK)),
 201                 K(global_page_state(NR_ANON_PAGES)),
 202                 K(global_page_state(NR_FILE_MAPPED)),
 203                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 204                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 205                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 206                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 207                 K(global_page_state(NR_PAGETABLE)),
 208                 K(global_page_state(NR_UNSTABLE_NFS)),
 209                 K(global_page_state(NR_BOUNCE)),
 210                 K(allowed),
 211                 K(committed),
 212                 (unsigned long)VMALLOC_TOTAL >> 10,
 213                 vmi.used >> 10,
 214                 vmi.largest_chunk >> 10
 215                 );
 216
 217                 len += hugetlb_report_meminfo(page + len);
 218
 219         return proc_calc_metrics(page, start, off, count, eof, len);
 220 #undef K
 221 }
 222
 223 extern struct seq_operations fragmentation_op;
 224 static int fragmentation_open(struct inode *inode, struct file *file)
 225 {
 226         (void)inode;
 227         return seq_open(file, &fragmentation_op);
 228 }
 229
 230 static struct file_operations fragmentation_file_operations = {
 231         .open           = fragmentation_open,
 232         .read           = seq_read,
 233         .llseek         = seq_lseek,
 234         .release        = seq_release,
 235 };
 236
 237 extern struct seq_operations zoneinfo_op;
 238 static int zoneinfo_open(struct inode *inode, struct file *file)
 239 {
 240         return seq_open(file, &zoneinfo_op);
 241 }
 242
 243 static struct file_operations proc_zoneinfo_file_operations = {
 244         .open           = zoneinfo_open,
 245         .read           = seq_read,
 246         .llseek         = seq_lseek,
 247         .release        = seq_release,
 248 };
 249
 250 static int version_read_proc(char *page, char **start, off_t off,
 251                                  int count, int *eof, void *data)
 252 {
 253         int len;
 254
 255         strcpy(page, linux_banner);
 256         len = strlen(page);
 257         return proc_calc_metrics(page, start, off, count, eof, len);
 258 }
 259
 260 extern struct seq_operations cpuinfo_op;
 261 static int cpuinfo_open(struct inode *inode, struct file *file)
 262 {
 263         return seq_open(file, &cpuinfo_op);
 264 }
 265
 266 static struct file_operations proc_cpuinfo_operations = {
 267         .open           = cpuinfo_open,
 268         .read           = seq_read,
 269         .llseek         = seq_lseek,
 270         .release        = seq_release,
 271 };
 272
 273 static int devinfo_show(struct seq_file *f, void *v)
 274 {
 275         int i = *(loff_t *) v;
 276
 277         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 278                 if (i == 0)
 279                         seq_printf(f, "Character devices:\n");
 280                 chrdev_show(f, i);
 281         }
 282 #ifdef CONFIG_BLOCK
 283         else {
 284                 i -= CHRDEV_MAJOR_HASH_SIZE;
 285                 if (i == 0)
 286                         seq_printf(f, "\nBlock devices:\n");
 287                 blkdev_show(f, i);
 288         }
 289 #endif
 290         return 0;
 291 }
 292
 293 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 294 {
 295         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 296                 return pos;
 297         return NULL;
 298 }
 299
 300 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 301 {
 302         (*pos)++;
 303         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 304                 return NULL;
 305         return pos;
 306 }
 307
 308 static void devinfo_stop(struct seq_file *f, void *v)
 309 {
 310         /* Nothing to do */
 311 }
 312
 313 static struct seq_operations devinfo_ops = {
 314         .start = devinfo_start,
 315         .next  = devinfo_next,
 316         .stop  = devinfo_stop,
 317         .show  = devinfo_show
 318 };
 319
 320 static int devinfo_open(struct inode *inode, struct file *filp)
 321 {
 322         return seq_open(filp, &devinfo_ops);
 323 }
 324
 325 static struct file_operations proc_devinfo_operations = {
 326         .open           = devinfo_open,
 327         .read           = seq_read,
 328         .llseek         = seq_lseek,
 329         .release        = seq_release,
 330 };
 331
 332 extern struct seq_operations vmstat_op;
 333 static int vmstat_open(struct inode *inode, struct file *file)
 334 {
 335         return seq_open(file, &vmstat_op);
 336 }
 337 static struct file_operations proc_vmstat_file_operations = {
 338         .open           = vmstat_open,
 339         .read           = seq_read,
 340         .llseek         = seq_lseek,
 341         .release        = seq_release,
 342 };
 343
 344 #ifdef CONFIG_PROC_HARDWARE
 345 static int hardware_read_proc(char *page, char **start, off_t off,
 346                                  int count, int *eof, void *data)
 347 {
 348         int len = get_hardware_list(page);
 349         return proc_calc_metrics(page, start, off, count, eof, len);
 350 }
 351 #endif
 352
 353 #ifdef CONFIG_STRAM_PROC
 354 static int stram_read_proc(char *page, char **start, off_t off,
 355                                  int count, int *eof, void *data)
 356 {
 357         int len = get_stram_list(page);
 358         return proc_calc_metrics(page, start, off, count, eof, len);
 359 }
 360 #endif
 361
 362 #ifdef CONFIG_BLOCK
 363 extern struct seq_operations partitions_op;
 364 static int partitions_open(struct inode *inode, struct file *file)
 365 {
 366         return seq_open(file, &partitions_op);
 367 }
 368 static struct file_operations proc_partitions_operations = {
 369         .open           = partitions_open,
 370         .read           = seq_read,
 371         .llseek         = seq_lseek,
 372         .release        = seq_release,
 373 };
 374
 375 extern struct seq_operations diskstats_op;
 376 static int diskstats_open(struct inode *inode, struct file *file)
 377 {
 378         return seq_open(file, &diskstats_op);
 379 }
 380 static struct file_operations proc_diskstats_operations = {
 381         .open           = diskstats_open,
 382         .read           = seq_read,
 383         .llseek         = seq_lseek,
 384         .release        = seq_release,
 385 };
 386 #endif
 387
 388 #ifdef CONFIG_MODULES
 389 extern struct seq_operations modules_op;
 390 static int modules_open(struct inode *inode, struct file *file)
 391 {
 392         return seq_open(file, &modules_op);
 393 }
 394 static struct file_operations proc_modules_operations = {
 395         .open           = modules_open,
 396         .read           = seq_read,
 397         .llseek         = seq_lseek,
 398         .release        = seq_release,
 399 };
 400 #endif
 401
 402 #ifdef CONFIG_SLAB
 403 extern struct seq_operations slabinfo_op;
 404 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 405 static int slabinfo_open(struct inode *inode, struct file *file)
 406 {
 407         return seq_open(file, &slabinfo_op);
 408 }
 409 static struct file_operations proc_slabinfo_operations = {
 410         .open           = slabinfo_open,
 411         .read           = seq_read,
 412         .write          = slabinfo_write,
 413         .llseek         = seq_lseek,
 414         .release        = seq_release,
 415 };
 416
 417 #ifdef CONFIG_DEBUG_SLAB_LEAK
 418 extern struct seq_operations slabstats_op;
 419 static int slabstats_open(struct inode *inode, struct file *file)
 420 {
 421         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 422         int ret = -ENOMEM;
 423         if (n) {
 424                 ret = seq_open(file, &slabstats_op);
 425                 if (!ret) {
 426                         struct seq_file *m = file->private_data;
 427                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 428                         m->private = n;
 429                         n = NULL;
 430                 }
 431                 kfree(n);
 432         }
 433         return ret;
 434 }
 435
 436 static int slabstats_release(struct inode *inode, struct file *file)
 437 {
 438         struct seq_file *m = file->private_data;
 439         kfree(m->private);
 440         return seq_release(inode, file);
 441 }
 442
 443 static struct file_operations proc_slabstats_operations = {
 444         .open           = slabstats_open,
 445         .read           = seq_read,
 446         .llseek         = seq_lseek,
 447         .release        = slabstats_release,
 448 };
 449 #endif
 450 #endif
 451
 452 static int show_stat(struct seq_file *p, void *v)
 453 {
 454         int i;
 455         unsigned long jif;
 456         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 457         u64 sum = 0;
 458
 459         user = nice = system = idle = iowait =
 460                 irq = softirq = steal = cputime64_zero;
 461         jif = - wall_to_monotonic.tv_sec;
 462         if (wall_to_monotonic.tv_nsec)
 463                 --jif;
 464
 465         for_each_possible_cpu(i) {
 466                 int j;
 467
 468                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 469                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 470                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 471                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 472                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 473                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 474                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 475                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 476                 for (j = 0 ; j < NR_IRQS ; j++)
 477                         sum += kstat_cpu(i).irqs[j];
 478         }
 479
 480         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 481                 (unsigned long long)cputime64_to_clock_t(user),
 482                 (unsigned long long)cputime64_to_clock_t(nice),
 483                 (unsigned long long)cputime64_to_clock_t(system),
 484                 (unsigned long long)cputime64_to_clock_t(idle),
 485                 (unsigned long long)cputime64_to_clock_t(iowait),
 486                 (unsigned long long)cputime64_to_clock_t(irq),
 487                 (unsigned long long)cputime64_to_clock_t(softirq),
 488                 (unsigned long long)cputime64_to_clock_t(steal));
 489         for_each_online_cpu(i) {
 490
 491                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 492                 user = kstat_cpu(i).cpustat.user;
 493                 nice = kstat_cpu(i).cpustat.nice;
 494                 system = kstat_cpu(i).cpustat.system;
 495                 idle = kstat_cpu(i).cpustat.idle;
 496                 iowait = kstat_cpu(i).cpustat.iowait;
 497                 irq = kstat_cpu(i).cpustat.irq;
 498                 softirq = kstat_cpu(i).cpustat.softirq;
 499                 steal = kstat_cpu(i).cpustat.steal;
 500                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 501                         i,
 502                         (unsigned long long)cputime64_to_clock_t(user),
 503                         (unsigned long long)cputime64_to_clock_t(nice),
 504                         (unsigned long long)cputime64_to_clock_t(system),
 505                         (unsigned long long)cputime64_to_clock_t(idle),
 506                         (unsigned long long)cputime64_to_clock_t(iowait),
 507                         (unsigned long long)cputime64_to_clock_t(irq),
 508                         (unsigned long long)cputime64_to_clock_t(softirq),
 509                         (unsigned long long)cputime64_to_clock_t(steal));
 510         }
 511         seq_printf(p, "intr %llu", (unsigned long long)sum);
 512
 513 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
 514         for (i = 0; i < NR_IRQS; i++)
 515                 seq_printf(p, " %u", kstat_irqs(i));
 516 #endif
 517
 518         seq_printf(p,
 519                 "\nctxt %llu\n"
 520                 "btime %lu\n"
 521                 "processes %lu\n"
 522                 "procs_running %lu\n"
 523                 "procs_blocked %lu\n",
 524                 nr_context_switches(),
 525                 (unsigned long)jif,
 526                 total_forks,
 527                 nr_running(),
 528                 nr_iowait());
 529
 530         return 0;
 531 }
 532
 533 static int stat_open(struct inode *inode, struct file *file)
 534 {
 535         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 536         char *buf;
 537         struct seq_file *m;
 538         int res;
 539
 540         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 541         if (size > 128 * 1024)
 542                 size = 128 * 1024;
 543         buf = kmalloc(size, GFP_KERNEL);
 544         if (!buf)
 545                 return -ENOMEM;
 546
 547         res = single_open(file, show_stat, NULL);
 548         if (!res) {
 549                 m = file->private_data;
 550                 m->buf = buf;
 551                 m->size = size;
 552         } else
 553                 kfree(buf);
 554         return res;
 555 }
 556 static struct file_operations proc_stat_operations = {
 557         .open           = stat_open,
 558         .read           = seq_read,
 559         .llseek         = seq_lseek,
 560         .release        = single_release,
 561 };
 562
 563 /*
 564  * /proc/interrupts
 565  */
 566 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 567 {
 568         return (*pos <= NR_IRQS) ? pos : NULL;
 569 }
 570
 571 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 572 {
 573         (*pos)++;
 574         if (*pos > NR_IRQS)
 575                 return NULL;
 576         return pos;
 577 }
 578
 579 static void int_seq_stop(struct seq_file *f, void *v)
 580 {
 581         /* Nothing to do */
 582 }
 583
 584
 585 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 586 static struct seq_operations int_seq_ops = {
 587         .start = int_seq_start,
 588         .next  = int_seq_next,
 589         .stop  = int_seq_stop,
 590         .show  = show_interrupts
 591 };
 592
 593 static int interrupts_open(struct inode *inode, struct file *filp)
 594 {
 595         return seq_open(filp, &int_seq_ops);
 596 }
 597
 598 static struct file_operations proc_interrupts_operations = {
 599         .open           = interrupts_open,
 600         .read           = seq_read,
 601         .llseek         = seq_lseek,
 602         .release        = seq_release,
 603 };
 604
 605 static int filesystems_read_proc(char *page, char **start, off_t off,
 606                                  int count, int *eof, void *data)
 607 {
 608         int len = get_filesystem_list(page);
 609         return proc_calc_metrics(page, start, off, count, eof, len);
 610 }
 611
 612 static int cmdline_read_proc(char *page, char **start, off_t off,
 613                                  int count, int *eof, void *data)
 614 {
 615         int len;
 616
 617         len = sprintf(page, "%s\n", saved_command_line);
 618         return proc_calc_metrics(page, start, off, count, eof, len);
 619 }
 620
 621 static int locks_read_proc(char *page, char **start, off_t off,
 622                                  int count, int *eof, void *data)
 623 {
 624         int len = get_locks_status(page, start, off, count);
 625
 626         if (len < count)
 627                 *eof = 1;
 628         return len;
 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 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         struct proc_dir_entry *entry;
 673         static struct {
 674                 char *name;
 675                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 676         } *p, simple_ones[] = {
 677                 {"loadavg",     loadavg_read_proc},
 678                 {"uptime",      uptime_read_proc},
 679                 {"meminfo",     meminfo_read_proc},
 680                 {"version",     version_read_proc},
 681 #ifdef CONFIG_PROC_HARDWARE
 682                 {"hardware",    hardware_read_proc},
 683 #endif
 684 #ifdef CONFIG_STRAM_PROC
 685                 {"stram",       stram_read_proc},
 686 #endif
 687                 {"filesystems", filesystems_read_proc},
 688                 {"cmdline",     cmdline_read_proc},
 689                 {"locks",       locks_read_proc},
 690                 {"execdomains", execdomains_read_proc},
 691                 {NULL,}
 692         };
 693         for (p = simple_ones; p->name; p++)
 694                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 695
 696         proc_symlink("mounts", NULL, "self/mounts");
 697
 698         /* And now for trickier ones */
 699         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 700         if (entry)
 701                 entry->proc_fops = &proc_kmsg_operations;
 702         create_seq_entry("devices", 0, &proc_devinfo_operations);
 703         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 704 #ifdef CONFIG_BLOCK
 705         create_seq_entry("partitions", 0, &proc_partitions_operations);
 706 #endif
 707         create_seq_entry("stat", 0, &proc_stat_operations);
 708         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 709 #ifdef CONFIG_SLAB
 710         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 711 #ifdef CONFIG_DEBUG_SLAB_LEAK
 712         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 713 #endif
 714 #endif
 715         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 716         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 717         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
 718 #ifdef CONFIG_BLOCK
 719         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 720 #endif
 721 #ifdef CONFIG_MODULES
 722         create_seq_entry("modules", 0, &proc_modules_operations);
 723 #endif
 724 #ifdef CONFIG_SCHEDSTATS
 725         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 726 #endif
 727 #ifdef CONFIG_PROC_KCORE
 728         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 729         if (proc_root_kcore) {
 730                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 731                 proc_root_kcore->size =
 732                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 733         }
 734 #endif
 735 #ifdef CONFIG_PROC_VMCORE
 736         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
 737         if (proc_vmcore)
 738                 proc_vmcore->proc_fops = &proc_vmcore_operations;
 739 #endif
 740 #ifdef CONFIG_MAGIC_SYSRQ
 741         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 742         if (entry)
 743                 entry->proc_fops = &proc_sysrq_trigger_operations;
 744 #endif
 745 }