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 = sprintf(page, linux_banner,
 257                 utsname()->release, utsname()->version);
 258         return proc_calc_metrics(page, start, off, count, eof, len);
 259 }
 260
 261 extern struct seq_operations cpuinfo_op;
 262 static int cpuinfo_open(struct inode *inode, struct file *file)
 263 {
 264         return seq_open(file, &cpuinfo_op);
 265 }
 266
 267 static struct file_operations proc_cpuinfo_operations = {
 268         .open           = cpuinfo_open,
 269         .read           = seq_read,
 270         .llseek         = seq_lseek,
 271         .release        = seq_release,
 272 };
 273
 274 static int devinfo_show(struct seq_file *f, void *v)
 275 {
 276         int i = *(loff_t *) v;
 277
 278         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 279                 if (i == 0)
 280                         seq_printf(f, "Character devices:\n");
 281                 chrdev_show(f, i);
 282         }
 283 #ifdef CONFIG_BLOCK
 284         else {
 285                 i -= CHRDEV_MAJOR_HASH_SIZE;
 286                 if (i == 0)
 287                         seq_printf(f, "\nBlock devices:\n");
 288                 blkdev_show(f, i);
 289         }
 290 #endif
 291         return 0;
 292 }
 293
 294 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 295 {
 296         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 297                 return pos;
 298         return NULL;
 299 }
 300
 301 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 302 {
 303         (*pos)++;
 304         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 305                 return NULL;
 306         return pos;
 307 }
 308
 309 static void devinfo_stop(struct seq_file *f, void *v)
 310 {
 311         /* Nothing to do */
 312 }
 313
 314 static struct seq_operations devinfo_ops = {
 315         .start = devinfo_start,
 316         .next  = devinfo_next,
 317         .stop  = devinfo_stop,
 318         .show  = devinfo_show
 319 };
 320
 321 static int devinfo_open(struct inode *inode, struct file *filp)
 322 {
 323         return seq_open(filp, &devinfo_ops);
 324 }
 325
 326 static struct file_operations proc_devinfo_operations = {
 327         .open           = devinfo_open,
 328         .read           = seq_read,
 329         .llseek         = seq_lseek,
 330         .release        = seq_release,
 331 };
 332
 333 extern struct seq_operations vmstat_op;
 334 static int vmstat_open(struct inode *inode, struct file *file)
 335 {
 336         return seq_open(file, &vmstat_op);
 337 }
 338 static struct file_operations proc_vmstat_file_operations = {
 339         .open           = vmstat_open,
 340         .read           = seq_read,
 341         .llseek         = seq_lseek,
 342         .release        = seq_release,
 343 };
 344
 345 #ifdef CONFIG_PROC_HARDWARE
 346 static int hardware_read_proc(char *page, char **start, off_t off,
 347                                  int count, int *eof, void *data)
 348 {
 349         int len = get_hardware_list(page);
 350         return proc_calc_metrics(page, start, off, count, eof, len);
 351 }
 352 #endif
 353
 354 #ifdef CONFIG_STRAM_PROC
 355 static int stram_read_proc(char *page, char **start, off_t off,
 356                                  int count, int *eof, void *data)
 357 {
 358         int len = get_stram_list(page);
 359         return proc_calc_metrics(page, start, off, count, eof, len);
 360 }
 361 #endif
 362
 363 #ifdef CONFIG_BLOCK
 364 extern struct seq_operations partitions_op;
 365 static int partitions_open(struct inode *inode, struct file *file)
 366 {
 367         return seq_open(file, &partitions_op);
 368 }
 369 static struct file_operations proc_partitions_operations = {
 370         .open           = partitions_open,
 371         .read           = seq_read,
 372         .llseek         = seq_lseek,
 373         .release        = seq_release,
 374 };
 375
 376 extern struct seq_operations diskstats_op;
 377 static int diskstats_open(struct inode *inode, struct file *file)
 378 {
 379         return seq_open(file, &diskstats_op);
 380 }
 381 static struct file_operations proc_diskstats_operations = {
 382         .open           = diskstats_open,
 383         .read           = seq_read,
 384         .llseek         = seq_lseek,
 385         .release        = seq_release,
 386 };
 387 #endif
 388
 389 #ifdef CONFIG_MODULES
 390 extern struct seq_operations modules_op;
 391 static int modules_open(struct inode *inode, struct file *file)
 392 {
 393         return seq_open(file, &modules_op);
 394 }
 395 static struct file_operations proc_modules_operations = {
 396         .open           = modules_open,
 397         .read           = seq_read,
 398         .llseek         = seq_lseek,
 399         .release        = seq_release,
 400 };
 401 #endif
 402
 403 #ifdef CONFIG_SLAB
 404 extern struct seq_operations slabinfo_op;
 405 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 406 static int slabinfo_open(struct inode *inode, struct file *file)
 407 {
 408         return seq_open(file, &slabinfo_op);
 409 }
 410 static struct file_operations proc_slabinfo_operations = {
 411         .open           = slabinfo_open,
 412         .read           = seq_read,
 413         .write          = slabinfo_write,
 414         .llseek         = seq_lseek,
 415         .release        = seq_release,
 416 };
 417
 418 #ifdef CONFIG_DEBUG_SLAB_LEAK
 419 extern struct seq_operations slabstats_op;
 420 static int slabstats_open(struct inode *inode, struct file *file)
 421 {
 422         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 423         int ret = -ENOMEM;
 424         if (n) {
 425                 ret = seq_open(file, &slabstats_op);
 426                 if (!ret) {
 427                         struct seq_file *m = file->private_data;
 428                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 429                         m->private = n;
 430                         n = NULL;
 431                 }
 432                 kfree(n);
 433         }
 434         return ret;
 435 }
 436
 437 static int slabstats_release(struct inode *inode, struct file *file)
 438 {
 439         struct seq_file *m = file->private_data;
 440         kfree(m->private);
 441         return seq_release(inode, file);
 442 }
 443
 444 static struct file_operations proc_slabstats_operations = {
 445         .open           = slabstats_open,
 446         .read           = seq_read,
 447         .llseek         = seq_lseek,
 448         .release        = slabstats_release,
 449 };
 450 #endif
 451 #endif
 452
 453 static int show_stat(struct seq_file *p, void *v)
 454 {
 455         int i;
 456         unsigned long jif;
 457         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 458         u64 sum = 0;
 459
 460         user = nice = system = idle = iowait =
 461                 irq = softirq = steal = cputime64_zero;
 462         jif = - wall_to_monotonic.tv_sec;
 463         if (wall_to_monotonic.tv_nsec)
 464                 --jif;
 465
 466         for_each_possible_cpu(i) {
 467                 int j;
 468
 469                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 470                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 471                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 472                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 473                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 474                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 475                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 476                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 477                 for (j = 0 ; j < NR_IRQS ; j++)
 478                         sum += kstat_cpu(i).irqs[j];
 479         }
 480
 481         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 482                 (unsigned long long)cputime64_to_clock_t(user),
 483                 (unsigned long long)cputime64_to_clock_t(nice),
 484                 (unsigned long long)cputime64_to_clock_t(system),
 485                 (unsigned long long)cputime64_to_clock_t(idle),
 486                 (unsigned long long)cputime64_to_clock_t(iowait),
 487                 (unsigned long long)cputime64_to_clock_t(irq),
 488                 (unsigned long long)cputime64_to_clock_t(softirq),
 489                 (unsigned long long)cputime64_to_clock_t(steal));
 490         for_each_online_cpu(i) {
 491
 492                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 493                 user = kstat_cpu(i).cpustat.user;
 494                 nice = kstat_cpu(i).cpustat.nice;
 495                 system = kstat_cpu(i).cpustat.system;
 496                 idle = kstat_cpu(i).cpustat.idle;
 497                 iowait = kstat_cpu(i).cpustat.iowait;
 498                 irq = kstat_cpu(i).cpustat.irq;
 499                 softirq = kstat_cpu(i).cpustat.softirq;
 500                 steal = kstat_cpu(i).cpustat.steal;
 501                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 502                         i,
 503                         (unsigned long long)cputime64_to_clock_t(user),
 504                         (unsigned long long)cputime64_to_clock_t(nice),
 505                         (unsigned long long)cputime64_to_clock_t(system),
 506                         (unsigned long long)cputime64_to_clock_t(idle),
 507                         (unsigned long long)cputime64_to_clock_t(iowait),
 508                         (unsigned long long)cputime64_to_clock_t(irq),
 509                         (unsigned long long)cputime64_to_clock_t(softirq),
 510                         (unsigned long long)cputime64_to_clock_t(steal));
 511         }
 512         seq_printf(p, "intr %llu", (unsigned long long)sum);
 513
 514 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
 515         for (i = 0; i < NR_IRQS; i++)
 516                 seq_printf(p, " %u", kstat_irqs(i));
 517 #endif
 518
 519         seq_printf(p,
 520                 "\nctxt %llu\n"
 521                 "btime %lu\n"
 522                 "processes %lu\n"
 523                 "procs_running %lu\n"
 524                 "procs_blocked %lu\n",
 525                 nr_context_switches(),
 526                 (unsigned long)jif,
 527                 total_forks,
 528                 nr_running(),
 529                 nr_iowait());
 530
 531         return 0;
 532 }
 533
 534 static int stat_open(struct inode *inode, struct file *file)
 535 {
 536         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 537         char *buf;
 538         struct seq_file *m;
 539         int res;
 540
 541         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 542         if (size > 128 * 1024)
 543                 size = 128 * 1024;
 544         buf = kmalloc(size, GFP_KERNEL);
 545         if (!buf)
 546                 return -ENOMEM;
 547
 548         res = single_open(file, show_stat, NULL);
 549         if (!res) {
 550                 m = file->private_data;
 551                 m->buf = buf;
 552                 m->size = size;
 553         } else
 554                 kfree(buf);
 555         return res;
 556 }
 557 static struct file_operations proc_stat_operations = {
 558         .open           = stat_open,
 559         .read           = seq_read,
 560         .llseek         = seq_lseek,
 561         .release        = single_release,
 562 };
 563
 564 /*
 565  * /proc/interrupts
 566  */
 567 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 568 {
 569         return (*pos <= NR_IRQS) ? pos : NULL;
 570 }
 571
 572 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 573 {
 574         (*pos)++;
 575         if (*pos > NR_IRQS)
 576                 return NULL;
 577         return pos;
 578 }
 579
 580 static void int_seq_stop(struct seq_file *f, void *v)
 581 {
 582         /* Nothing to do */
 583 }
 584
 585
 586 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 587 static struct seq_operations int_seq_ops = {
 588         .start = int_seq_start,
 589         .next  = int_seq_next,
 590         .stop  = int_seq_stop,
 591         .show  = show_interrupts
 592 };
 593
 594 static int interrupts_open(struct inode *inode, struct file *filp)
 595 {
 596         return seq_open(filp, &int_seq_ops);
 597 }
 598
 599 static struct file_operations proc_interrupts_operations = {
 600         .open           = interrupts_open,
 601         .read           = seq_read,
 602         .llseek         = seq_lseek,
 603         .release        = seq_release,
 604 };
 605
 606 static int filesystems_read_proc(char *page, char **start, off_t off,
 607                                  int count, int *eof, void *data)
 608 {
 609         int len = get_filesystem_list(page);
 610         return proc_calc_metrics(page, start, off, count, eof, len);
 611 }
 612
 613 static int cmdline_read_proc(char *page, char **start, off_t off,
 614                                  int count, int *eof, void *data)
 615 {
 616         int len;
 617
 618         len = sprintf(page, "%s\n", saved_command_line);
 619         return proc_calc_metrics(page, start, off, count, eof, len);
 620 }
 621
 622 static int locks_read_proc(char *page, char **start, off_t off,
 623                                  int count, int *eof, void *data)
 624 {
 625         int len = get_locks_status(page, start, off, count);
 626
 627         if (len < count)
 628                 *eof = 1;
 629         return len;
 630 }
 631
 632 static int execdomains_read_proc(char *page, char **start, off_t off,
 633                                  int count, int *eof, void *data)
 634 {
 635         int len = get_exec_domain_list(page);
 636         return proc_calc_metrics(page, start, off, count, eof, len);
 637 }
 638
 639 #ifdef CONFIG_MAGIC_SYSRQ
 640 /*
 641  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 642  */
 643 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 644                                    size_t count, loff_t *ppos)
 645 {
 646         if (count) {
 647                 char c;
 648
 649                 if (get_user(c, buf))
 650                         return -EFAULT;
 651                 __handle_sysrq(c, NULL, 0);
 652         }
 653         return count;
 654 }
 655
 656 static struct file_operations proc_sysrq_trigger_operations = {
 657         .write          = write_sysrq_trigger,
 658 };
 659 #endif
 660
 661 struct proc_dir_entry *proc_root_kcore;
 662
 663 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 664 {
 665         struct proc_dir_entry *entry;
 666         entry = create_proc_entry(name, mode, NULL);
 667         if (entry)
 668                 entry->proc_fops = f;
 669 }
 670
 671 void __init proc_misc_init(void)
 672 {
 673         struct proc_dir_entry *entry;
 674         static struct {
 675                 char *name;
 676                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 677         } *p, simple_ones[] = {
 678                 {"loadavg",     loadavg_read_proc},
 679                 {"uptime",      uptime_read_proc},
 680                 {"meminfo",     meminfo_read_proc},
 681                 {"version",     version_read_proc},
 682 #ifdef CONFIG_PROC_HARDWARE
 683                 {"hardware",    hardware_read_proc},
 684 #endif
 685 #ifdef CONFIG_STRAM_PROC
 686                 {"stram",       stram_read_proc},
 687 #endif
 688                 {"filesystems", filesystems_read_proc},
 689                 {"cmdline",     cmdline_read_proc},
 690                 {"locks",       locks_read_proc},
 691                 {"execdomains", execdomains_read_proc},
 692                 {NULL,}
 693         };
 694         for (p = simple_ones; p->name; p++)
 695                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 696
 697         proc_symlink("mounts", NULL, "self/mounts");
 698
 699         /* And now for trickier ones */
 700 #ifdef CONFIG_PRINTK
 701         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 702         if (entry)
 703                 entry->proc_fops = &proc_kmsg_operations;
 704 #endif
 705         create_seq_entry("devices", 0, &proc_devinfo_operations);
 706         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 707 #ifdef CONFIG_BLOCK
 708         create_seq_entry("partitions", 0, &proc_partitions_operations);
 709 #endif
 710         create_seq_entry("stat", 0, &proc_stat_operations);
 711         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 712 #ifdef CONFIG_SLAB
 713         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 714 #ifdef CONFIG_DEBUG_SLAB_LEAK
 715         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 716 #endif
 717 #endif
 718         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 719         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 720         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
 721 #ifdef CONFIG_BLOCK
 722         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 723 #endif
 724 #ifdef CONFIG_MODULES
 725         create_seq_entry("modules", 0, &proc_modules_operations);
 726 #endif
 727 #ifdef CONFIG_SCHEDSTATS
 728         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 729 #endif
 730 #ifdef CONFIG_PROC_KCORE
 731         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 732         if (proc_root_kcore) {
 733                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 734                 proc_root_kcore->size =
 735                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 736         }
 737 #endif
 738 #ifdef CONFIG_PROC_VMCORE
 739         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
 740         if (proc_vmcore)
 741                 proc_vmcore->proc_fops = &proc_vmcore_operations;
 742 #endif
 743 #ifdef CONFIG_MAGIC_SYSRQ
 744         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 745         if (entry)
 746                 entry->proc_fops = &proc_sysrq_trigger_operations;
 747 #endif
 748 }