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/utsname.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/jiffies.h>
  46 #include <linux/sysrq.h>
  47 #include <linux/vmalloc.h>
  48 #include <linux/crash_dump.h>
  49 #include <linux/pid_namespace.h>
  50 #include <linux/compile.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/pgtable.h>
  53 #include <asm/io.h>
  54 #include <asm/tlb.h>
  55 #include <asm/div64.h>
  56 #include "internal.h"
  57
  58 #define LOAD_INT(x) ((x) >> FSHIFT)
  59 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  60 /*
  61  * Warning: stuff below (imported functions) assumes that its output will fit
  62  * into one page. For some of those functions it may be wrong. Moreover, we
  63  * have a way to deal with that gracefully. Right now I used straightforward
  64  * wrappers, but this needs further analysis wrt potential overflows.
  65  */
  66 extern int get_hardware_list(char *);
  67 extern int get_stram_list(char *);
  68 extern int get_filesystem_list(char *);
  69 extern int get_exec_domain_list(char *);
  70 extern int get_dma_list(char *);
  71 extern int get_locks_status (char *, char **, off_t, int);
  72
  73 static int proc_calc_metrics(char *page, char **start, off_t off,
  74                                  int count, int *eof, int len)
  75 {
  76         if (len <= off+count) *eof = 1;
  77         *start = page + off;
  78         len -= off;
  79         if (len>count) len = count;
  80         if (len<0) len = 0;
  81         return len;
  82 }
  83
  84 static int loadavg_read_proc(char *page, char **start, off_t off,
  85                                  int count, int *eof, void *data)
  86 {
  87         int a, b, c;
  88         int len;
  89
  90         a = avenrun[0] + (FIXED_1/200);
  91         b = avenrun[1] + (FIXED_1/200);
  92         c = avenrun[2] + (FIXED_1/200);
  93         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  94                 LOAD_INT(a), LOAD_FRAC(a),
  95                 LOAD_INT(b), LOAD_FRAC(b),
  96                 LOAD_INT(c), LOAD_FRAC(c),
  97                 nr_running(), nr_threads, current->nsproxy->pid_ns->last_pid);
  98         return proc_calc_metrics(page, start, off, count, eof, len);
  99 }
 100
 101 static int uptime_read_proc(char *page, char **start, off_t off,
 102                                  int count, int *eof, void *data)
 103 {
 104         struct timespec uptime;
 105         struct timespec idle;
 106         int len;
 107         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 108
 109         do_posix_clock_monotonic_gettime(&uptime);
 110         cputime_to_timespec(idletime, &idle);
 111         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 112                         (unsigned long) uptime.tv_sec,
 113                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 114                         (unsigned long) idle.tv_sec,
 115                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 116
 117         return proc_calc_metrics(page, start, off, count, eof, len);
 118 }
 119
 120 static int meminfo_read_proc(char *page, char **start, off_t off,
 121                                  int count, int *eof, void *data)
 122 {
 123         struct sysinfo i;
 124         int len;
 125         unsigned long inactive;
 126         unsigned long active;
 127         unsigned long free;
 128         unsigned long committed;
 129         unsigned long allowed;
 130         struct vmalloc_info vmi;
 131         long cached;
 132
 133         get_zone_counts(&active, &inactive, &free);
 134
 135 /*
 136  * display in kilobytes.
 137  */
 138 #define K(x) ((x) << (PAGE_SHIFT - 10))
 139         si_meminfo(&i);
 140         si_swapinfo(&i);
 141         committed = atomic_read(&vm_committed_space);
 142         allowed = ((totalram_pages - hugetlb_total_pages())
 143                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 144
 145         cached = global_page_state(NR_FILE_PAGES) -
 146                         total_swapcache_pages - i.bufferram;
 147         if (cached < 0)
 148                 cached = 0;
 149
 150         get_vmalloc_info(&vmi);
 151
 152         /*
 153          * Tagged format, for easy grepping and expansion.
 154          */
 155         len = sprintf(page,
 156                 "MemTotal:     %8lu kB\n"
 157                 "MemFree:      %8lu kB\n"
 158                 "Buffers:      %8lu kB\n"
 159                 "Cached:       %8lu kB\n"
 160                 "SwapCached:   %8lu kB\n"
 161                 "Active:       %8lu kB\n"
 162                 "Inactive:     %8lu kB\n"
 163 #ifdef CONFIG_HIGHMEM
 164                 "HighTotal:    %8lu kB\n"
 165                 "HighFree:     %8lu kB\n"
 166                 "LowTotal:     %8lu kB\n"
 167                 "LowFree:      %8lu kB\n"
 168 #endif
 169                 "SwapTotal:    %8lu kB\n"
 170                 "SwapFree:     %8lu kB\n"
 171                 "Dirty:        %8lu kB\n"
 172                 "Writeback:    %8lu kB\n"
 173                 "AnonPages:    %8lu kB\n"
 174                 "Mapped:       %8lu kB\n"
 175                 "Slab:         %8lu kB\n"
 176                 "SReclaimable: %8lu kB\n"
 177                 "SUnreclaim:   %8lu kB\n"
 178                 "PageTables:   %8lu kB\n"
 179                 "NFS_Unstable: %8lu kB\n"
 180                 "Bounce:       %8lu kB\n"
 181                 "CommitLimit:  %8lu kB\n"
 182                 "Committed_AS: %8lu kB\n"
 183                 "VmallocTotal: %8lu kB\n"
 184                 "VmallocUsed:  %8lu kB\n"
 185                 "VmallocChunk: %8lu kB\n",
 186                 K(i.totalram),
 187                 K(i.freeram),
 188                 K(i.bufferram),
 189                 K(cached),
 190                 K(total_swapcache_pages),
 191                 K(active),
 192                 K(inactive),
 193 #ifdef CONFIG_HIGHMEM
 194                 K(i.totalhigh),
 195                 K(i.freehigh),
 196                 K(i.totalram-i.totalhigh),
 197                 K(i.freeram-i.freehigh),
 198 #endif
 199                 K(i.totalswap),
 200                 K(i.freeswap),
 201                 K(global_page_state(NR_FILE_DIRTY)),
 202                 K(global_page_state(NR_WRITEBACK)),
 203                 K(global_page_state(NR_ANON_PAGES)),
 204                 K(global_page_state(NR_FILE_MAPPED)),
 205                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 206                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 207                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 208                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 209                 K(global_page_state(NR_PAGETABLE)),
 210                 K(global_page_state(NR_UNSTABLE_NFS)),
 211                 K(global_page_state(NR_BOUNCE)),
 212                 K(allowed),
 213                 K(committed),
 214                 (unsigned long)VMALLOC_TOTAL >> 10,
 215                 vmi.used >> 10,
 216                 vmi.largest_chunk >> 10
 217                 );
 218
 219                 len += hugetlb_report_meminfo(page + len);
 220
 221         return proc_calc_metrics(page, start, off, count, eof, len);
 222 #undef K
 223 }
 224
 225 extern struct seq_operations fragmentation_op;
 226 static int fragmentation_open(struct inode *inode, struct file *file)
 227 {
 228         (void)inode;
 229         return seq_open(file, &fragmentation_op);
 230 }
 231
 232 static struct file_operations fragmentation_file_operations = {
 233         .open           = fragmentation_open,
 234         .read           = seq_read,
 235         .llseek         = seq_lseek,
 236         .release        = seq_release,
 237 };
 238
 239 extern struct seq_operations zoneinfo_op;
 240 static int zoneinfo_open(struct inode *inode, struct file *file)
 241 {
 242         return seq_open(file, &zoneinfo_op);
 243 }
 244
 245 static struct file_operations proc_zoneinfo_file_operations = {
 246         .open           = zoneinfo_open,
 247         .read           = seq_read,
 248         .llseek         = seq_lseek,
 249         .release        = seq_release,
 250 };
 251
 252 static int version_read_proc(char *page, char **start, off_t off,
 253                                  int count, int *eof, void *data)
 254 {
 255         int len;
 256
 257         /* FIXED STRING! Don't touch! */
 258         len = snprintf(page, PAGE_SIZE,
 259                 "%s version %s"
 260                 " (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ")"
 261                 " (" LINUX_COMPILER ")"
 262                 " %s\n",
 263                 utsname()->sysname,
 264                 utsname()->release,
 265                 utsname()->version);
 266         return proc_calc_metrics(page, start, off, count, eof, len);
 267 }
 268
 269 extern struct seq_operations cpuinfo_op;
 270 static int cpuinfo_open(struct inode *inode, struct file *file)
 271 {
 272         return seq_open(file, &cpuinfo_op);
 273 }
 274
 275 static struct file_operations proc_cpuinfo_operations = {
 276         .open           = cpuinfo_open,
 277         .read           = seq_read,
 278         .llseek         = seq_lseek,
 279         .release        = seq_release,
 280 };
 281
 282 static int devinfo_show(struct seq_file *f, void *v)
 283 {
 284         int i = *(loff_t *) v;
 285
 286         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 287                 if (i == 0)
 288                         seq_printf(f, "Character devices:\n");
 289                 chrdev_show(f, i);
 290         }
 291 #ifdef CONFIG_BLOCK
 292         else {
 293                 i -= CHRDEV_MAJOR_HASH_SIZE;
 294                 if (i == 0)
 295                         seq_printf(f, "\nBlock devices:\n");
 296                 blkdev_show(f, i);
 297         }
 298 #endif
 299         return 0;
 300 }
 301
 302 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 303 {
 304         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 305                 return pos;
 306         return NULL;
 307 }
 308
 309 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 310 {
 311         (*pos)++;
 312         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 313                 return NULL;
 314         return pos;
 315 }
 316
 317 static void devinfo_stop(struct seq_file *f, void *v)
 318 {
 319         /* Nothing to do */
 320 }
 321
 322 static struct seq_operations devinfo_ops = {
 323         .start = devinfo_start,
 324         .next  = devinfo_next,
 325         .stop  = devinfo_stop,
 326         .show  = devinfo_show
 327 };
 328
 329 static int devinfo_open(struct inode *inode, struct file *filp)
 330 {
 331         return seq_open(filp, &devinfo_ops);
 332 }
 333
 334 static struct file_operations proc_devinfo_operations = {
 335         .open           = devinfo_open,
 336         .read           = seq_read,
 337         .llseek         = seq_lseek,
 338         .release        = seq_release,
 339 };
 340
 341 extern struct seq_operations vmstat_op;
 342 static int vmstat_open(struct inode *inode, struct file *file)
 343 {
 344         return seq_open(file, &vmstat_op);
 345 }
 346 static struct file_operations proc_vmstat_file_operations = {
 347         .open           = vmstat_open,
 348         .read           = seq_read,
 349         .llseek         = seq_lseek,
 350         .release        = seq_release,
 351 };
 352
 353 #ifdef CONFIG_PROC_HARDWARE
 354 static int hardware_read_proc(char *page, char **start, off_t off,
 355                                  int count, int *eof, void *data)
 356 {
 357         int len = get_hardware_list(page);
 358         return proc_calc_metrics(page, start, off, count, eof, len);
 359 }
 360 #endif
 361
 362 #ifdef CONFIG_STRAM_PROC
 363 static int stram_read_proc(char *page, char **start, off_t off,
 364                                  int count, int *eof, void *data)
 365 {
 366         int len = get_stram_list(page);
 367         return proc_calc_metrics(page, start, off, count, eof, len);
 368 }
 369 #endif
 370
 371 #ifdef CONFIG_BLOCK
 372 extern struct seq_operations partitions_op;
 373 static int partitions_open(struct inode *inode, struct file *file)
 374 {
 375         return seq_open(file, &partitions_op);
 376 }
 377 static struct file_operations proc_partitions_operations = {
 378         .open           = partitions_open,
 379         .read           = seq_read,
 380         .llseek         = seq_lseek,
 381         .release        = seq_release,
 382 };
 383
 384 extern struct seq_operations diskstats_op;
 385 static int diskstats_open(struct inode *inode, struct file *file)
 386 {
 387         return seq_open(file, &diskstats_op);
 388 }
 389 static struct file_operations proc_diskstats_operations = {
 390         .open           = diskstats_open,
 391         .read           = seq_read,
 392         .llseek         = seq_lseek,
 393         .release        = seq_release,
 394 };
 395 #endif
 396
 397 #ifdef CONFIG_MODULES
 398 extern struct seq_operations modules_op;
 399 static int modules_open(struct inode *inode, struct file *file)
 400 {
 401         return seq_open(file, &modules_op);
 402 }
 403 static struct file_operations proc_modules_operations = {
 404         .open           = modules_open,
 405         .read           = seq_read,
 406         .llseek         = seq_lseek,
 407         .release        = seq_release,
 408 };
 409 #endif
 410
 411 #ifdef CONFIG_SLAB
 412 extern struct seq_operations slabinfo_op;
 413 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 414 static int slabinfo_open(struct inode *inode, struct file *file)
 415 {
 416         return seq_open(file, &slabinfo_op);
 417 }
 418 static struct file_operations proc_slabinfo_operations = {
 419         .open           = slabinfo_open,
 420         .read           = seq_read,
 421         .write          = slabinfo_write,
 422         .llseek         = seq_lseek,
 423         .release        = seq_release,
 424 };
 425
 426 #ifdef CONFIG_DEBUG_SLAB_LEAK
 427 extern struct seq_operations slabstats_op;
 428 static int slabstats_open(struct inode *inode, struct file *file)
 429 {
 430         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 431         int ret = -ENOMEM;
 432         if (n) {
 433                 ret = seq_open(file, &slabstats_op);
 434                 if (!ret) {
 435                         struct seq_file *m = file->private_data;
 436                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 437                         m->private = n;
 438                         n = NULL;
 439                 }
 440                 kfree(n);
 441         }
 442         return ret;
 443 }
 444
 445 static int slabstats_release(struct inode *inode, struct file *file)
 446 {
 447         struct seq_file *m = file->private_data;
 448         kfree(m->private);
 449         return seq_release(inode, file);
 450 }
 451
 452 static struct file_operations proc_slabstats_operations = {
 453         .open           = slabstats_open,
 454         .read           = seq_read,
 455         .llseek         = seq_lseek,
 456         .release        = slabstats_release,
 457 };
 458 #endif
 459 #endif
 460
 461 static int show_stat(struct seq_file *p, void *v)
 462 {
 463         int i;
 464         unsigned long jif;
 465         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 466         u64 sum = 0;
 467
 468         user = nice = system = idle = iowait =
 469                 irq = softirq = steal = cputime64_zero;
 470         jif = - wall_to_monotonic.tv_sec;
 471         if (wall_to_monotonic.tv_nsec)
 472                 --jif;
 473
 474         for_each_possible_cpu(i) {
 475                 int j;
 476
 477                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 478                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 479                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 480                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 481                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 482                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 483                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 484                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 485                 for (j = 0 ; j < NR_IRQS ; j++)
 486                         sum += kstat_cpu(i).irqs[j];
 487         }
 488
 489         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 490                 (unsigned long long)cputime64_to_clock_t(user),
 491                 (unsigned long long)cputime64_to_clock_t(nice),
 492                 (unsigned long long)cputime64_to_clock_t(system),
 493                 (unsigned long long)cputime64_to_clock_t(idle),
 494                 (unsigned long long)cputime64_to_clock_t(iowait),
 495                 (unsigned long long)cputime64_to_clock_t(irq),
 496                 (unsigned long long)cputime64_to_clock_t(softirq),
 497                 (unsigned long long)cputime64_to_clock_t(steal));
 498         for_each_online_cpu(i) {
 499
 500                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 501                 user = kstat_cpu(i).cpustat.user;
 502                 nice = kstat_cpu(i).cpustat.nice;
 503                 system = kstat_cpu(i).cpustat.system;
 504                 idle = kstat_cpu(i).cpustat.idle;
 505                 iowait = kstat_cpu(i).cpustat.iowait;
 506                 irq = kstat_cpu(i).cpustat.irq;
 507                 softirq = kstat_cpu(i).cpustat.softirq;
 508                 steal = kstat_cpu(i).cpustat.steal;
 509                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 510                         i,
 511                         (unsigned long long)cputime64_to_clock_t(user),
 512                         (unsigned long long)cputime64_to_clock_t(nice),
 513                         (unsigned long long)cputime64_to_clock_t(system),
 514                         (unsigned long long)cputime64_to_clock_t(idle),
 515                         (unsigned long long)cputime64_to_clock_t(iowait),
 516                         (unsigned long long)cputime64_to_clock_t(irq),
 517                         (unsigned long long)cputime64_to_clock_t(softirq),
 518                         (unsigned long long)cputime64_to_clock_t(steal));
 519         }
 520         seq_printf(p, "intr %llu", (unsigned long long)sum);
 521
 522 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
 523         for (i = 0; i < NR_IRQS; i++)
 524                 seq_printf(p, " %u", kstat_irqs(i));
 525 #endif
 526
 527         seq_printf(p,
 528                 "\nctxt %llu\n"
 529                 "btime %lu\n"
 530                 "processes %lu\n"
 531                 "procs_running %lu\n"
 532                 "procs_blocked %lu\n",
 533                 nr_context_switches(),
 534                 (unsigned long)jif,
 535                 total_forks,
 536                 nr_running(),
 537                 nr_iowait());
 538
 539         return 0;
 540 }
 541
 542 static int stat_open(struct inode *inode, struct file *file)
 543 {
 544         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 545         char *buf;
 546         struct seq_file *m;
 547         int res;
 548
 549         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 550         if (size > 128 * 1024)
 551                 size = 128 * 1024;
 552         buf = kmalloc(size, GFP_KERNEL);
 553         if (!buf)
 554                 return -ENOMEM;
 555
 556         res = single_open(file, show_stat, NULL);
 557         if (!res) {
 558                 m = file->private_data;
 559                 m->buf = buf;
 560                 m->size = size;
 561         } else
 562                 kfree(buf);
 563         return res;
 564 }
 565 static struct file_operations proc_stat_operations = {
 566         .open           = stat_open,
 567         .read           = seq_read,
 568         .llseek         = seq_lseek,
 569         .release        = single_release,
 570 };
 571
 572 /*
 573  * /proc/interrupts
 574  */
 575 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 576 {
 577         return (*pos <= NR_IRQS) ? pos : NULL;
 578 }
 579
 580 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 581 {
 582         (*pos)++;
 583         if (*pos > NR_IRQS)
 584                 return NULL;
 585         return pos;
 586 }
 587
 588 static void int_seq_stop(struct seq_file *f, void *v)
 589 {
 590         /* Nothing to do */
 591 }
 592
 593
 594 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 595 static struct seq_operations int_seq_ops = {
 596         .start = int_seq_start,
 597         .next  = int_seq_next,
 598         .stop  = int_seq_stop,
 599         .show  = show_interrupts
 600 };
 601
 602 static int interrupts_open(struct inode *inode, struct file *filp)
 603 {
 604         return seq_open(filp, &int_seq_ops);
 605 }
 606
 607 static struct file_operations proc_interrupts_operations = {
 608         .open           = interrupts_open,
 609         .read           = seq_read,
 610         .llseek         = seq_lseek,
 611         .release        = seq_release,
 612 };
 613
 614 static int filesystems_read_proc(char *page, char **start, off_t off,
 615                                  int count, int *eof, void *data)
 616 {
 617         int len = get_filesystem_list(page);
 618         return proc_calc_metrics(page, start, off, count, eof, len);
 619 }
 620
 621 static int cmdline_read_proc(char *page, char **start, off_t off,
 622                                  int count, int *eof, void *data)
 623 {
 624         int len;
 625
 626         len = sprintf(page, "%s\n", saved_command_line);
 627         return proc_calc_metrics(page, start, off, count, eof, len);
 628 }
 629
 630 static int locks_read_proc(char *page, char **start, off_t off,
 631                                  int count, int *eof, void *data)
 632 {
 633         int len = get_locks_status(page, start, off, count);
 634
 635         if (len < count)
 636                 *eof = 1;
 637         return len;
 638 }
 639
 640 static int execdomains_read_proc(char *page, char **start, off_t off,
 641                                  int count, int *eof, void *data)
 642 {
 643         int len = get_exec_domain_list(page);
 644         return proc_calc_metrics(page, start, off, count, eof, len);
 645 }
 646
 647 #ifdef CONFIG_MAGIC_SYSRQ
 648 /*
 649  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 650  */
 651 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 652                                    size_t count, loff_t *ppos)
 653 {
 654         if (count) {
 655                 char c;
 656
 657                 if (get_user(c, buf))
 658                         return -EFAULT;
 659                 __handle_sysrq(c, NULL, 0);
 660         }
 661         return count;
 662 }
 663
 664 static struct file_operations proc_sysrq_trigger_operations = {
 665         .write          = write_sysrq_trigger,
 666 };
 667 #endif
 668
 669 struct proc_dir_entry *proc_root_kcore;
 670
 671 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 672 {
 673         struct proc_dir_entry *entry;
 674         entry = create_proc_entry(name, mode, NULL);
 675         if (entry)
 676                 entry->proc_fops = f;
 677 }
 678
 679 void __init proc_misc_init(void)
 680 {
 681         struct proc_dir_entry *entry;
 682         static struct {
 683                 char *name;
 684                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 685         } *p, simple_ones[] = {
 686                 {"loadavg",     loadavg_read_proc},
 687                 {"uptime",      uptime_read_proc},
 688                 {"meminfo",     meminfo_read_proc},
 689                 {"version",     version_read_proc},
 690 #ifdef CONFIG_PROC_HARDWARE
 691                 {"hardware",    hardware_read_proc},
 692 #endif
 693 #ifdef CONFIG_STRAM_PROC
 694                 {"stram",       stram_read_proc},
 695 #endif
 696                 {"filesystems", filesystems_read_proc},
 697                 {"cmdline",     cmdline_read_proc},
 698                 {"locks",       locks_read_proc},
 699                 {"execdomains", execdomains_read_proc},
 700                 {NULL,}
 701         };
 702         for (p = simple_ones; p->name; p++)
 703                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 704
 705         proc_symlink("mounts", NULL, "self/mounts");
 706
 707         /* And now for trickier ones */
 708 #ifdef CONFIG_PRINTK
 709         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 710         if (entry)
 711                 entry->proc_fops = &proc_kmsg_operations;
 712 #endif
 713         create_seq_entry("devices", 0, &proc_devinfo_operations);
 714         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 715 #ifdef CONFIG_BLOCK
 716         create_seq_entry("partitions", 0, &proc_partitions_operations);
 717 #endif
 718         create_seq_entry("stat", 0, &proc_stat_operations);
 719         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 720 #ifdef CONFIG_SLAB
 721         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 722 #ifdef CONFIG_DEBUG_SLAB_LEAK
 723         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 724 #endif
 725 #endif
 726         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 727         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 728         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
 729 #ifdef CONFIG_BLOCK
 730         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 731 #endif
 732 #ifdef CONFIG_MODULES
 733         create_seq_entry("modules", 0, &proc_modules_operations);
 734 #endif
 735 #ifdef CONFIG_SCHEDSTATS
 736         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 737 #endif
 738 #ifdef CONFIG_PROC_KCORE
 739         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 740         if (proc_root_kcore) {
 741                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 742                 proc_root_kcore->size =
 743                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 744         }
 745 #endif
 746 #ifdef CONFIG_PROC_VMCORE
 747         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
 748         if (proc_vmcore)
 749                 proc_vmcore->proc_fops = &proc_vmcore_operations;
 750 #endif
 751 #ifdef CONFIG_MAGIC_SYSRQ
 752         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 753         if (entry)
 754                 entry->proc_fops = &proc_sysrq_trigger_operations;
 755 #endif
 756 }