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/quicklist.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/ioport.h>
  30 #include <linux/mm.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/swap.h>
  35 #include <linux/slab.h>
  36 #include <linux/genhd.h>
  37 #include <linux/smp.h>
  38 #include <linux/signal.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/times.h>
  43 #include <linux/profile.h>
  44 #include <linux/utsname.h>
  45 #include <linux/blkdev.h>
  46 #include <linux/hugetlb.h>
  47 #include <linux/jiffies.h>
  48 #include <linux/sysrq.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/crash_dump.h>
  51 #include <linux/pid_namespace.h>
  52 #include <linux/bootmem.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/pgtable.h>
  55 #include <asm/io.h>
  56 #include <asm/tlb.h>
  57 #include <asm/div64.h>
  58 #include "internal.h"
  59
  60 #define LOAD_INT(x) ((x) >> FSHIFT)
  61 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  62 /*
  63  * Warning: stuff below (imported functions) assumes that its output will fit
  64  * into one page. For some of those functions it may be wrong. Moreover, we
  65  * have a way to deal with that gracefully. Right now I used straightforward
  66  * wrappers, but this needs further analysis wrt potential overflows.
  67  */
  68 extern int get_hardware_list(char *);
  69 extern int get_stram_list(char *);
  70 extern int get_exec_domain_list(char *);
  71 extern int get_dma_list(char *);
  72
  73 static int proc_calc_metrics(char *page, char **start, off_t off,
  74                                  int count, int *eof, int len)
  75 {
  76         if (len <= off+count) *eof = 1;
  77         *start = page + off;
  78         len -= off;
  79         if (len>count) len = count;
  80         if (len<0) len = 0;
  81         return len;
  82 }
  83
  84 static int loadavg_read_proc(char *page, char **start, off_t off,
  85                                  int count, int *eof, void *data)
  86 {
  87         int a, b, c;
  88         int len;
  89         unsigned long seq;
  90
  91         do {
  92                 seq = read_seqbegin(&xtime_lock);
  93                 a = avenrun[0] + (FIXED_1/200);
  94                 b = avenrun[1] + (FIXED_1/200);
  95                 c = avenrun[2] + (FIXED_1/200);
  96         } while (read_seqretry(&xtime_lock, seq));
  97
  98         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  99                 LOAD_INT(a), LOAD_FRAC(a),
 100                 LOAD_INT(b), LOAD_FRAC(b),
 101                 LOAD_INT(c), LOAD_FRAC(c),
 102                 nr_running(), nr_threads,
 103                 task_active_pid_ns(current)->last_pid);
 104         return proc_calc_metrics(page, start, off, count, eof, len);
 105 }
 106
 107 static int uptime_read_proc(char *page, char **start, off_t off,
 108                                  int count, int *eof, void *data)
 109 {
 110         struct timespec uptime;
 111         struct timespec idle;
 112         int len;
 113         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 114
 115         do_posix_clock_monotonic_gettime(&uptime);
 116         monotonic_to_bootbased(&uptime);
 117         cputime_to_timespec(idletime, &idle);
 118         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 119                         (unsigned long) uptime.tv_sec,
 120                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 121                         (unsigned long) idle.tv_sec,
 122                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 123
 124         return proc_calc_metrics(page, start, off, count, eof, len);
 125 }
 126
 127 int __attribute__((weak)) arch_report_meminfo(char *page)
 128 {
 129         return 0;
 130 }
 131
 132 static int meminfo_read_proc(char *page, char **start, off_t off,
 133                                  int count, int *eof, void *data)
 134 {
 135         struct sysinfo i;
 136         int len;
 137         unsigned long committed;
 138         unsigned long allowed;
 139         struct vmalloc_info vmi;
 140         long cached;
 141
 142 /*
 143  * display in kilobytes.
 144  */
 145 #define K(x) ((x) << (PAGE_SHIFT - 10))
 146         si_meminfo(&i);
 147         si_swapinfo(&i);
 148         committed = atomic_long_read(&vm_committed_space);
 149         allowed = ((totalram_pages - hugetlb_total_pages())
 150                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 151
 152         cached = global_page_state(NR_FILE_PAGES) -
 153                         total_swapcache_pages - i.bufferram;
 154         if (cached < 0)
 155                 cached = 0;
 156
 157         get_vmalloc_info(&vmi);
 158
 159         /*
 160          * Tagged format, for easy grepping and expansion.
 161          */
 162         len = sprintf(page,
 163                 "MemTotal:     %8lu kB\n"
 164                 "MemFree:      %8lu kB\n"
 165                 "Buffers:      %8lu kB\n"
 166                 "Cached:       %8lu kB\n"
 167                 "SwapCached:   %8lu kB\n"
 168                 "Active:       %8lu kB\n"
 169                 "Inactive:     %8lu kB\n"
 170 #ifdef CONFIG_HIGHMEM
 171                 "HighTotal:    %8lu kB\n"
 172                 "HighFree:     %8lu kB\n"
 173                 "LowTotal:     %8lu kB\n"
 174                 "LowFree:      %8lu kB\n"
 175 #endif
 176                 "SwapTotal:    %8lu kB\n"
 177                 "SwapFree:     %8lu kB\n"
 178                 "Dirty:        %8lu kB\n"
 179                 "Writeback:    %8lu kB\n"
 180                 "AnonPages:    %8lu kB\n"
 181                 "Mapped:       %8lu kB\n"
 182                 "Slab:         %8lu kB\n"
 183                 "SReclaimable: %8lu kB\n"
 184                 "SUnreclaim:   %8lu kB\n"
 185                 "PageTables:   %8lu kB\n"
 186                 "NFS_Unstable: %8lu kB\n"
 187                 "Bounce:       %8lu kB\n"
 188                 "WritebackTmp: %8lu kB\n"
 189                 "CommitLimit:  %8lu kB\n"
 190                 "Committed_AS: %8lu kB\n"
 191                 "VmallocTotal: %8lu kB\n"
 192                 "VmallocUsed:  %8lu kB\n"
 193                 "VmallocChunk: %8lu kB\n"
 194                 "Quicklists:   %8lu kB\n",
 195                 K(i.totalram),
 196                 K(i.freeram),
 197                 K(i.bufferram),
 198                 K(cached),
 199                 K(total_swapcache_pages),
 200                 K(global_page_state(NR_ACTIVE)),
 201                 K(global_page_state(NR_INACTIVE)),
 202 #ifdef CONFIG_HIGHMEM
 203                 K(i.totalhigh),
 204                 K(i.freehigh),
 205                 K(i.totalram-i.totalhigh),
 206                 K(i.freeram-i.freehigh),
 207 #endif
 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_RECLAIMABLE) +
 215                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 216                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 217                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 218                 K(global_page_state(NR_PAGETABLE)),
 219                 K(global_page_state(NR_UNSTABLE_NFS)),
 220                 K(global_page_state(NR_BOUNCE)),
 221                 K(global_page_state(NR_WRITEBACK_TEMP)),
 222                 K(allowed),
 223                 K(committed),
 224                 (unsigned long)VMALLOC_TOTAL >> 10,
 225                 vmi.used >> 10,
 226                 vmi.largest_chunk >> 10,
 227                 K(quicklist_total_size())
 228                 );
 229
 230                 len += hugetlb_report_meminfo(page + len);
 231
 232         len += arch_report_meminfo(page + len);
 233
 234         return proc_calc_metrics(page, start, off, count, eof, len);
 235 #undef K
 236 }
 237
 238 static int fragmentation_open(struct inode *inode, struct file *file)
 239 {
 240         (void)inode;
 241         return seq_open(file, &fragmentation_op);
 242 }
 243
 244 static const struct file_operations fragmentation_file_operations = {
 245         .open           = fragmentation_open,
 246         .read           = seq_read,
 247         .llseek         = seq_lseek,
 248         .release        = seq_release,
 249 };
 250
 251 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 252 {
 253         return seq_open(file, &pagetypeinfo_op);
 254 }
 255
 256 static const struct file_operations pagetypeinfo_file_ops = {
 257         .open           = pagetypeinfo_open,
 258         .read           = seq_read,
 259         .llseek         = seq_lseek,
 260         .release        = seq_release,
 261 };
 262
 263 static int zoneinfo_open(struct inode *inode, struct file *file)
 264 {
 265         return seq_open(file, &zoneinfo_op);
 266 }
 267
 268 static const struct file_operations proc_zoneinfo_file_operations = {
 269         .open           = zoneinfo_open,
 270         .read           = seq_read,
 271         .llseek         = seq_lseek,
 272         .release        = seq_release,
 273 };
 274
 275 static int version_read_proc(char *page, char **start, off_t off,
 276                                  int count, int *eof, void *data)
 277 {
 278         int len;
 279
 280         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 281                 utsname()->sysname,
 282                 utsname()->release,
 283                 utsname()->version);
 284         return proc_calc_metrics(page, start, off, count, eof, len);
 285 }
 286
 287 extern const struct seq_operations cpuinfo_op;
 288 static int cpuinfo_open(struct inode *inode, struct file *file)
 289 {
 290         return seq_open(file, &cpuinfo_op);
 291 }
 292
 293 static const struct file_operations proc_cpuinfo_operations = {
 294         .open           = cpuinfo_open,
 295         .read           = seq_read,
 296         .llseek         = seq_lseek,
 297         .release        = seq_release,
 298 };
 299
 300 static int devinfo_show(struct seq_file *f, void *v)
 301 {
 302         int i = *(loff_t *) v;
 303
 304         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 305                 if (i == 0)
 306                         seq_printf(f, "Character devices:\n");
 307                 chrdev_show(f, i);
 308         }
 309 #ifdef CONFIG_BLOCK
 310         else {
 311                 i -= CHRDEV_MAJOR_HASH_SIZE;
 312                 if (i == 0)
 313                         seq_printf(f, "\nBlock devices:\n");
 314                 blkdev_show(f, i);
 315         }
 316 #endif
 317         return 0;
 318 }
 319
 320 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 321 {
 322         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 323                 return pos;
 324         return NULL;
 325 }
 326
 327 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 328 {
 329         (*pos)++;
 330         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 331                 return NULL;
 332         return pos;
 333 }
 334
 335 static void devinfo_stop(struct seq_file *f, void *v)
 336 {
 337         /* Nothing to do */
 338 }
 339
 340 static const struct seq_operations devinfo_ops = {
 341         .start = devinfo_start,
 342         .next  = devinfo_next,
 343         .stop  = devinfo_stop,
 344         .show  = devinfo_show
 345 };
 346
 347 static int devinfo_open(struct inode *inode, struct file *filp)
 348 {
 349         return seq_open(filp, &devinfo_ops);
 350 }
 351
 352 static const struct file_operations proc_devinfo_operations = {
 353         .open           = devinfo_open,
 354         .read           = seq_read,
 355         .llseek         = seq_lseek,
 356         .release        = seq_release,
 357 };
 358
 359 static int vmstat_open(struct inode *inode, struct file *file)
 360 {
 361         return seq_open(file, &vmstat_op);
 362 }
 363 static const struct file_operations proc_vmstat_file_operations = {
 364         .open           = vmstat_open,
 365         .read           = seq_read,
 366         .llseek         = seq_lseek,
 367         .release        = seq_release,
 368 };
 369
 370 #ifdef CONFIG_PROC_HARDWARE
 371 static int hardware_read_proc(char *page, char **start, off_t off,
 372                                  int count, int *eof, void *data)
 373 {
 374         int len = get_hardware_list(page);
 375         return proc_calc_metrics(page, start, off, count, eof, len);
 376 }
 377 #endif
 378
 379 #ifdef CONFIG_STRAM_PROC
 380 static int stram_read_proc(char *page, char **start, off_t off,
 381                                  int count, int *eof, void *data)
 382 {
 383         int len = get_stram_list(page);
 384         return proc_calc_metrics(page, start, off, count, eof, len);
 385 }
 386 #endif
 387
 388 #ifdef CONFIG_BLOCK
 389 static int partitions_open(struct inode *inode, struct file *file)
 390 {
 391         return seq_open(file, &partitions_op);
 392 }
 393 static const struct file_operations proc_partitions_operations = {
 394         .open           = partitions_open,
 395         .read           = seq_read,
 396         .llseek         = seq_lseek,
 397         .release        = seq_release,
 398 };
 399
 400 static int diskstats_open(struct inode *inode, struct file *file)
 401 {
 402         return seq_open(file, &diskstats_op);
 403 }
 404 static const struct file_operations proc_diskstats_operations = {
 405         .open           = diskstats_open,
 406         .read           = seq_read,
 407         .llseek         = seq_lseek,
 408         .release        = seq_release,
 409 };
 410 #endif
 411
 412 #ifdef CONFIG_MODULES
 413 extern const struct seq_operations modules_op;
 414 static int modules_open(struct inode *inode, struct file *file)
 415 {
 416         return seq_open(file, &modules_op);
 417 }
 418 static const struct file_operations proc_modules_operations = {
 419         .open           = modules_open,
 420         .read           = seq_read,
 421         .llseek         = seq_lseek,
 422         .release        = seq_release,
 423 };
 424 #endif
 425
 426 #ifdef CONFIG_SLABINFO
 427 static int slabinfo_open(struct inode *inode, struct file *file)
 428 {
 429         return seq_open(file, &slabinfo_op);
 430 }
 431 static const struct file_operations proc_slabinfo_operations = {
 432         .open           = slabinfo_open,
 433         .read           = seq_read,
 434         .write          = slabinfo_write,
 435         .llseek         = seq_lseek,
 436         .release        = seq_release,
 437 };
 438
 439 #ifdef CONFIG_DEBUG_SLAB_LEAK
 440 extern const struct seq_operations slabstats_op;
 441 static int slabstats_open(struct inode *inode, struct file *file)
 442 {
 443         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 444         int ret = -ENOMEM;
 445         if (n) {
 446                 ret = seq_open(file, &slabstats_op);
 447                 if (!ret) {
 448                         struct seq_file *m = file->private_data;
 449                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 450                         m->private = n;
 451                         n = NULL;
 452                 }
 453                 kfree(n);
 454         }
 455         return ret;
 456 }
 457
 458 static const struct file_operations proc_slabstats_operations = {
 459         .open           = slabstats_open,
 460         .read           = seq_read,
 461         .llseek         = seq_lseek,
 462         .release        = seq_release_private,
 463 };
 464 #endif
 465 #endif
 466
 467 #ifdef CONFIG_MMU
 468 static int vmalloc_open(struct inode *inode, struct file *file)
 469 {
 470         unsigned int *ptr = NULL;
 471         int ret;
 472
 473         if (NUMA_BUILD)
 474                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 475         ret = seq_open(file, &vmalloc_op);
 476         if (!ret) {
 477                 struct seq_file *m = file->private_data;
 478                 m->private = ptr;
 479         } else
 480                 kfree(ptr);
 481         return ret;
 482 }
 483
 484 static const struct file_operations proc_vmalloc_operations = {
 485         .open           = vmalloc_open,
 486         .read           = seq_read,
 487         .llseek         = seq_lseek,
 488         .release        = seq_release_private,
 489 };
 490 #endif
 491
 492 #ifndef arch_irq_stat_cpu
 493 #define arch_irq_stat_cpu(cpu) 0
 494 #endif
 495 #ifndef arch_irq_stat
 496 #define arch_irq_stat() 0
 497 #endif
 498
 499 static int show_stat(struct seq_file *p, void *v)
 500 {
 501         int i;
 502         unsigned long jif;
 503         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 504         cputime64_t guest;
 505         u64 sum = 0;
 506         struct timespec boottime;
 507         unsigned int *per_irq_sum;
 508
 509         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 510         if (!per_irq_sum)
 511                 return -ENOMEM;
 512
 513         user = nice = system = idle = iowait =
 514                 irq = softirq = steal = cputime64_zero;
 515         guest = cputime64_zero;
 516         getboottime(&boottime);
 517         jif = boottime.tv_sec;
 518
 519         for_each_possible_cpu(i) {
 520                 int j;
 521
 522                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 523                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 524                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 525                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 526                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 527                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 528                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 529                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 530                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 531                 for (j = 0; j < NR_IRQS; j++) {
 532                         unsigned int temp = kstat_cpu(i).irqs[j];
 533                         sum += temp;
 534                         per_irq_sum[j] += temp;
 535                 }
 536                 sum += arch_irq_stat_cpu(i);
 537         }
 538         sum += arch_irq_stat();
 539
 540         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 541                 (unsigned long long)cputime64_to_clock_t(user),
 542                 (unsigned long long)cputime64_to_clock_t(nice),
 543                 (unsigned long long)cputime64_to_clock_t(system),
 544                 (unsigned long long)cputime64_to_clock_t(idle),
 545                 (unsigned long long)cputime64_to_clock_t(iowait),
 546                 (unsigned long long)cputime64_to_clock_t(irq),
 547                 (unsigned long long)cputime64_to_clock_t(softirq),
 548                 (unsigned long long)cputime64_to_clock_t(steal),
 549                 (unsigned long long)cputime64_to_clock_t(guest));
 550         for_each_online_cpu(i) {
 551
 552                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 553                 user = kstat_cpu(i).cpustat.user;
 554                 nice = kstat_cpu(i).cpustat.nice;
 555                 system = kstat_cpu(i).cpustat.system;
 556                 idle = kstat_cpu(i).cpustat.idle;
 557                 iowait = kstat_cpu(i).cpustat.iowait;
 558                 irq = kstat_cpu(i).cpustat.irq;
 559                 softirq = kstat_cpu(i).cpustat.softirq;
 560                 steal = kstat_cpu(i).cpustat.steal;
 561                 guest = kstat_cpu(i).cpustat.guest;
 562                 seq_printf(p,
 563                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 564                         i,
 565                         (unsigned long long)cputime64_to_clock_t(user),
 566                         (unsigned long long)cputime64_to_clock_t(nice),
 567                         (unsigned long long)cputime64_to_clock_t(system),
 568                         (unsigned long long)cputime64_to_clock_t(idle),
 569                         (unsigned long long)cputime64_to_clock_t(iowait),
 570                         (unsigned long long)cputime64_to_clock_t(irq),
 571                         (unsigned long long)cputime64_to_clock_t(softirq),
 572                         (unsigned long long)cputime64_to_clock_t(steal),
 573                         (unsigned long long)cputime64_to_clock_t(guest));
 574         }
 575         seq_printf(p, "intr %llu", (unsigned long long)sum);
 576
 577         for (i = 0; i < NR_IRQS; i++)
 578                 seq_printf(p, " %u", per_irq_sum[i]);
 579
 580         seq_printf(p,
 581                 "\nctxt %llu\n"
 582                 "btime %lu\n"
 583                 "processes %lu\n"
 584                 "procs_running %lu\n"
 585                 "procs_blocked %lu\n",
 586                 nr_context_switches(),
 587                 (unsigned long)jif,
 588                 total_forks,
 589                 nr_running(),
 590                 nr_iowait());
 591
 592         kfree(per_irq_sum);
 593         return 0;
 594 }
 595
 596 static int stat_open(struct inode *inode, struct file *file)
 597 {
 598         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 599         char *buf;
 600         struct seq_file *m;
 601         int res;
 602
 603         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 604         if (size > 128 * 1024)
 605                 size = 128 * 1024;
 606         buf = kmalloc(size, GFP_KERNEL);
 607         if (!buf)
 608                 return -ENOMEM;
 609
 610         res = single_open(file, show_stat, NULL);
 611         if (!res) {
 612                 m = file->private_data;
 613                 m->buf = buf;
 614                 m->size = size;
 615         } else
 616                 kfree(buf);
 617         return res;
 618 }
 619 static const struct file_operations proc_stat_operations = {
 620         .open           = stat_open,
 621         .read           = seq_read,
 622         .llseek         = seq_lseek,
 623         .release        = single_release,
 624 };
 625
 626 /*
 627  * /proc/interrupts
 628  */
 629 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 630 {
 631         return (*pos <= NR_IRQS) ? pos : NULL;
 632 }
 633
 634 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 635 {
 636         (*pos)++;
 637         if (*pos > NR_IRQS)
 638                 return NULL;
 639         return pos;
 640 }
 641
 642 static void int_seq_stop(struct seq_file *f, void *v)
 643 {
 644         /* Nothing to do */
 645 }
 646
 647
 648 static const struct seq_operations int_seq_ops = {
 649         .start = int_seq_start,
 650         .next  = int_seq_next,
 651         .stop  = int_seq_stop,
 652         .show  = show_interrupts
 653 };
 654
 655 static int interrupts_open(struct inode *inode, struct file *filp)
 656 {
 657         return seq_open(filp, &int_seq_ops);
 658 }
 659
 660 static const struct file_operations proc_interrupts_operations = {
 661         .open           = interrupts_open,
 662         .read           = seq_read,
 663         .llseek         = seq_lseek,
 664         .release        = seq_release,
 665 };
 666
 667 static int filesystems_read_proc(char *page, char **start, off_t off,
 668                                  int count, int *eof, void *data)
 669 {
 670         int len = get_filesystem_list(page);
 671         return proc_calc_metrics(page, start, off, count, eof, len);
 672 }
 673
 674 static int cmdline_read_proc(char *page, char **start, off_t off,
 675                                  int count, int *eof, void *data)
 676 {
 677         int len;
 678
 679         len = sprintf(page, "%s\n", saved_command_line);
 680         return proc_calc_metrics(page, start, off, count, eof, len);
 681 }
 682
 683 static int locks_open(struct inode *inode, struct file *filp)
 684 {
 685         return seq_open(filp, &locks_seq_operations);
 686 }
 687
 688 static const struct file_operations proc_locks_operations = {
 689         .open           = locks_open,
 690         .read           = seq_read,
 691         .llseek         = seq_lseek,
 692         .release        = seq_release,
 693 };
 694
 695 static int execdomains_read_proc(char *page, char **start, off_t off,
 696                                  int count, int *eof, void *data)
 697 {
 698         int len = get_exec_domain_list(page);
 699         return proc_calc_metrics(page, start, off, count, eof, len);
 700 }
 701
 702 #ifdef CONFIG_MAGIC_SYSRQ
 703 /*
 704  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 705  */
 706 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 707                                    size_t count, loff_t *ppos)
 708 {
 709         if (count) {
 710                 char c;
 711
 712                 if (get_user(c, buf))
 713                         return -EFAULT;
 714                 __handle_sysrq(c, NULL, 0);
 715         }
 716         return count;
 717 }
 718
 719 static const struct file_operations proc_sysrq_trigger_operations = {
 720         .write          = write_sysrq_trigger,
 721 };
 722 #endif
 723
 724 #ifdef CONFIG_PROC_PAGE_MONITOR
 725 #define KPMSIZE sizeof(u64)
 726 #define KPMMASK (KPMSIZE - 1)
 727 /* /proc/kpagecount - an array exposing page counts
 728  *
 729  * Each entry is a u64 representing the corresponding
 730  * physical page count.
 731  */
 732 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 733                              size_t count, loff_t *ppos)
 734 {
 735         u64 __user *out = (u64 __user *)buf;
 736         struct page *ppage;
 737         unsigned long src = *ppos;
 738         unsigned long pfn;
 739         ssize_t ret = 0;
 740         u64 pcount;
 741
 742         pfn = src / KPMSIZE;
 743         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 744         if (src & KPMMASK || count & KPMMASK)
 745                 return -EINVAL;
 746
 747         while (count > 0) {
 748                 ppage = NULL;
 749                 if (pfn_valid(pfn))
 750                         ppage = pfn_to_page(pfn);
 751                 pfn++;
 752                 if (!ppage)
 753                         pcount = 0;
 754                 else
 755                         pcount = page_mapcount(ppage);
 756
 757                 if (put_user(pcount, out++)) {
 758                         ret = -EFAULT;
 759                         break;
 760                 }
 761
 762                 count -= KPMSIZE;
 763         }
 764
 765         *ppos += (char __user *)out - buf;
 766         if (!ret)
 767                 ret = (char __user *)out - buf;
 768         return ret;
 769 }
 770
 771 static struct file_operations proc_kpagecount_operations = {
 772         .llseek = mem_lseek,
 773         .read = kpagecount_read,
 774 };
 775
 776 /* /proc/kpageflags - an array exposing page flags
 777  *
 778  * Each entry is a u64 representing the corresponding
 779  * physical page flags.
 780  */
 781
 782 /* These macros are used to decouple internal flags from exported ones */
 783
 784 #define KPF_LOCKED     0
 785 #define KPF_ERROR      1
 786 #define KPF_REFERENCED 2
 787 #define KPF_UPTODATE   3
 788 #define KPF_DIRTY      4
 789 #define KPF_LRU        5
 790 #define KPF_ACTIVE     6
 791 #define KPF_SLAB       7
 792 #define KPF_WRITEBACK  8
 793 #define KPF_RECLAIM    9
 794 #define KPF_BUDDY     10
 795
 796 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 797
 798 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 799                              size_t count, loff_t *ppos)
 800 {
 801         u64 __user *out = (u64 __user *)buf;
 802         struct page *ppage;
 803         unsigned long src = *ppos;
 804         unsigned long pfn;
 805         ssize_t ret = 0;
 806         u64 kflags, uflags;
 807
 808         pfn = src / KPMSIZE;
 809         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 810         if (src & KPMMASK || count & KPMMASK)
 811                 return -EINVAL;
 812
 813         while (count > 0) {
 814                 ppage = NULL;
 815                 if (pfn_valid(pfn))
 816                         ppage = pfn_to_page(pfn);
 817                 pfn++;
 818                 if (!ppage)
 819                         kflags = 0;
 820                 else
 821                         kflags = ppage->flags;
 822
 823                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 824                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 825                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 826                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 827                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 828                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 829                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 830                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 831                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 832                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 833                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 834
 835                 if (put_user(uflags, out++)) {
 836                         ret = -EFAULT;
 837                         break;
 838                 }
 839
 840                 count -= KPMSIZE;
 841         }
 842
 843         *ppos += (char __user *)out - buf;
 844         if (!ret)
 845                 ret = (char __user *)out - buf;
 846         return ret;
 847 }
 848
 849 static struct file_operations proc_kpageflags_operations = {
 850         .llseek = mem_lseek,
 851         .read = kpageflags_read,
 852 };
 853 #endif /* CONFIG_PROC_PAGE_MONITOR */
 854
 855 struct proc_dir_entry *proc_root_kcore;
 856
 857 void __init proc_misc_init(void)
 858 {
 859         static struct {
 860                 char *name;
 861                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 862         } *p, simple_ones[] = {
 863                 {"loadavg",     loadavg_read_proc},
 864                 {"uptime",      uptime_read_proc},
 865                 {"meminfo",     meminfo_read_proc},
 866                 {"version",     version_read_proc},
 867 #ifdef CONFIG_PROC_HARDWARE
 868                 {"hardware",    hardware_read_proc},
 869 #endif
 870 #ifdef CONFIG_STRAM_PROC
 871                 {"stram",       stram_read_proc},
 872 #endif
 873                 {"filesystems", filesystems_read_proc},
 874                 {"cmdline",     cmdline_read_proc},
 875                 {"execdomains", execdomains_read_proc},
 876                 {NULL,}
 877         };
 878         for (p = simple_ones; p->name; p++)
 879                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 880
 881         proc_symlink("mounts", NULL, "self/mounts");
 882
 883         /* And now for trickier ones */
 884 #ifdef CONFIG_PRINTK
 885         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 886 #endif
 887         proc_create("locks", 0, NULL, &proc_locks_operations);
 888         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 889         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 890 #ifdef CONFIG_BLOCK
 891         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 892 #endif
 893         proc_create("stat", 0, NULL, &proc_stat_operations);
 894         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 895 #ifdef CONFIG_SLABINFO
 896         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 897 #ifdef CONFIG_DEBUG_SLAB_LEAK
 898         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 899 #endif
 900 #endif
 901 #ifdef CONFIG_MMU
 902         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 903 #endif
 904         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 905         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 906         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 907         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 908 #ifdef CONFIG_BLOCK
 909         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 910 #endif
 911 #ifdef CONFIG_MODULES
 912         proc_create("modules", 0, NULL, &proc_modules_operations);
 913 #endif
 914 #ifdef CONFIG_SCHEDSTATS
 915         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 916 #endif
 917 #ifdef CONFIG_PROC_KCORE
 918         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 919         if (proc_root_kcore)
 920                 proc_root_kcore->size =
 921                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 922 #endif
 923 #ifdef CONFIG_PROC_PAGE_MONITOR
 924         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 925         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 926 #endif
 927 #ifdef CONFIG_PROC_VMCORE
 928         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 929 #endif
 930 #ifdef CONFIG_MAGIC_SYSRQ
 931         proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
 932 #endif
 933 }