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