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