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