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
  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         unsigned long seq;
  89
  90         do {
  91                 seq = read_seqbegin(&xtime_lock);
  92                 a = avenrun[0] + (FIXED_1/200);
  93                 b = avenrun[1] + (FIXED_1/200);
  94                 c = avenrun[2] + (FIXED_1/200);
  95         } while (read_seqretry(&xtime_lock, seq));
  96
  97         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  98                 LOAD_INT(a), LOAD_FRAC(a),
  99                 LOAD_INT(b), LOAD_FRAC(b),
 100                 LOAD_INT(c), LOAD_FRAC(c),
 101                 nr_running(), nr_threads,
 102                 task_active_pid_ns(current)->last_pid);
 103         return proc_calc_metrics(page, start, off, count, eof, len);
 104 }
 105
 106 static int uptime_read_proc(char *page, char **start, off_t off,
 107                                  int count, int *eof, void *data)
 108 {
 109         struct timespec uptime;
 110         struct timespec idle;
 111         int len;
 112         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 113
 114         do_posix_clock_monotonic_gettime(&uptime);
 115         monotonic_to_bootbased(&uptime);
 116         cputime_to_timespec(idletime, &idle);
 117         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 118                         (unsigned long) uptime.tv_sec,
 119                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 120                         (unsigned long) idle.tv_sec,
 121                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 122
 123         return proc_calc_metrics(page, start, off, count, eof, len);
 124 }
 125
 126 int __attribute__((weak)) arch_report_meminfo(char *page)
 127 {
 128         return 0;
 129 }
 130
 131 static int meminfo_read_proc(char *page, char **start, off_t off,
 132                                  int count, int *eof, void *data)
 133 {
 134         struct sysinfo i;
 135         int len;
 136         unsigned long committed;
 137         unsigned long allowed;
 138         struct vmalloc_info vmi;
 139         long cached;
 140
 141 /*
 142  * display in kilobytes.
 143  */
 144 #define K(x) ((x) << (PAGE_SHIFT - 10))
 145         si_meminfo(&i);
 146         si_swapinfo(&i);
 147         committed = atomic_long_read(&vm_committed_space);
 148         allowed = ((totalram_pages - hugetlb_total_pages())
 149                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 150
 151         cached = global_page_state(NR_FILE_PAGES) -
 152                         total_swapcache_pages - i.bufferram;
 153         if (cached < 0)
 154                 cached = 0;
 155
 156         get_vmalloc_info(&vmi);
 157
 158         /*
 159          * Tagged format, for easy grepping and expansion.
 160          */
 161         len = sprintf(page,
 162                 "MemTotal:     %8lu kB\n"
 163                 "MemFree:      %8lu kB\n"
 164                 "Buffers:      %8lu kB\n"
 165                 "Cached:       %8lu kB\n"
 166                 "SwapCached:   %8lu kB\n"
 167                 "Active:       %8lu kB\n"
 168                 "Inactive:     %8lu kB\n"
 169 #ifdef CONFIG_HIGHMEM
 170                 "HighTotal:    %8lu kB\n"
 171                 "HighFree:     %8lu kB\n"
 172                 "LowTotal:     %8lu kB\n"
 173                 "LowFree:      %8lu kB\n"
 174 #endif
 175                 "SwapTotal:    %8lu kB\n"
 176                 "SwapFree:     %8lu kB\n"
 177                 "Dirty:        %8lu kB\n"
 178                 "Writeback:    %8lu kB\n"
 179                 "AnonPages:    %8lu kB\n"
 180                 "Mapped:       %8lu kB\n"
 181                 "Slab:         %8lu kB\n"
 182                 "SReclaimable: %8lu kB\n"
 183                 "SUnreclaim:   %8lu kB\n"
 184                 "PageTables:   %8lu kB\n"
 185 #ifdef CONFIG_QUICKLIST
 186                 "Quicklists:   %8lu kB\n"
 187 #endif
 188                 "NFS_Unstable: %8lu kB\n"
 189                 "Bounce:       %8lu kB\n"
 190                 "WritebackTmp: %8lu kB\n"
 191                 "CommitLimit:  %8lu kB\n"
 192                 "Committed_AS: %8lu kB\n"
 193                 "VmallocTotal: %8lu kB\n"
 194                 "VmallocUsed:  %8lu kB\n"
 195                 "VmallocChunk: %8lu kB\n",
 196                 K(i.totalram),
 197                 K(i.freeram),
 198                 K(i.bufferram),
 199                 K(cached),
 200                 K(total_swapcache_pages),
 201                 K(global_page_state(NR_ACTIVE)),
 202                 K(global_page_state(NR_INACTIVE)),
 203 #ifdef CONFIG_HIGHMEM
 204                 K(i.totalhigh),
 205                 K(i.freehigh),
 206                 K(i.totalram-i.totalhigh),
 207                 K(i.freeram-i.freehigh),
 208 #endif
 209                 K(i.totalswap),
 210                 K(i.freeswap),
 211                 K(global_page_state(NR_FILE_DIRTY)),
 212                 K(global_page_state(NR_WRITEBACK)),
 213                 K(global_page_state(NR_ANON_PAGES)),
 214                 K(global_page_state(NR_FILE_MAPPED)),
 215                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 216                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 217                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 218                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 219                 K(global_page_state(NR_PAGETABLE)),
 220 #ifdef CONFIG_QUICKLIST
 221                 K(quicklist_total_size()),
 222 #endif
 223                 K(global_page_state(NR_UNSTABLE_NFS)),
 224                 K(global_page_state(NR_BOUNCE)),
 225                 K(global_page_state(NR_WRITEBACK_TEMP)),
 226                 K(allowed),
 227                 K(committed),
 228                 (unsigned long)VMALLOC_TOTAL >> 10,
 229                 vmi.used >> 10,
 230                 vmi.largest_chunk >> 10
 231                 );
 232
 233                 len += hugetlb_report_meminfo(page + len);
 234
 235         len += arch_report_meminfo(page + len);
 236
 237         return proc_calc_metrics(page, start, off, count, eof, len);
 238 #undef K
 239 }
 240
 241 static int fragmentation_open(struct inode *inode, struct file *file)
 242 {
 243         (void)inode;
 244         return seq_open(file, &fragmentation_op);
 245 }
 246
 247 static const struct file_operations fragmentation_file_operations = {
 248         .open           = fragmentation_open,
 249         .read           = seq_read,
 250         .llseek         = seq_lseek,
 251         .release        = seq_release,
 252 };
 253
 254 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 255 {
 256         return seq_open(file, &pagetypeinfo_op);
 257 }
 258
 259 static const struct file_operations pagetypeinfo_file_ops = {
 260         .open           = pagetypeinfo_open,
 261         .read           = seq_read,
 262         .llseek         = seq_lseek,
 263         .release        = seq_release,
 264 };
 265
 266 static int zoneinfo_open(struct inode *inode, struct file *file)
 267 {
 268         return seq_open(file, &zoneinfo_op);
 269 }
 270
 271 static const struct file_operations proc_zoneinfo_file_operations = {
 272         .open           = zoneinfo_open,
 273         .read           = seq_read,
 274         .llseek         = seq_lseek,
 275         .release        = seq_release,
 276 };
 277
 278 static int version_read_proc(char *page, char **start, off_t off,
 279                                  int count, int *eof, void *data)
 280 {
 281         int len;
 282
 283         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 284                 utsname()->sysname,
 285                 utsname()->release,
 286                 utsname()->version);
 287         return proc_calc_metrics(page, start, off, count, eof, len);
 288 }
 289
 290 extern const struct seq_operations cpuinfo_op;
 291 static int cpuinfo_open(struct inode *inode, struct file *file)
 292 {
 293         return seq_open(file, &cpuinfo_op);
 294 }
 295
 296 static const struct file_operations proc_cpuinfo_operations = {
 297         .open           = cpuinfo_open,
 298         .read           = seq_read,
 299         .llseek         = seq_lseek,
 300         .release        = seq_release,
 301 };
 302
 303 static int devinfo_show(struct seq_file *f, void *v)
 304 {
 305         int i = *(loff_t *) v;
 306
 307         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 308                 if (i == 0)
 309                         seq_printf(f, "Character devices:\n");
 310                 chrdev_show(f, i);
 311         }
 312 #ifdef CONFIG_BLOCK
 313         else {
 314                 i -= CHRDEV_MAJOR_HASH_SIZE;
 315                 if (i == 0)
 316                         seq_printf(f, "\nBlock devices:\n");
 317                 blkdev_show(f, i);
 318         }
 319 #endif
 320         return 0;
 321 }
 322
 323 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 324 {
 325         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 326                 return pos;
 327         return NULL;
 328 }
 329
 330 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 331 {
 332         (*pos)++;
 333         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 334                 return NULL;
 335         return pos;
 336 }
 337
 338 static void devinfo_stop(struct seq_file *f, void *v)
 339 {
 340         /* Nothing to do */
 341 }
 342
 343 static const struct seq_operations devinfo_ops = {
 344         .start = devinfo_start,
 345         .next  = devinfo_next,
 346         .stop  = devinfo_stop,
 347         .show  = devinfo_show
 348 };
 349
 350 static int devinfo_open(struct inode *inode, struct file *filp)
 351 {
 352         return seq_open(filp, &devinfo_ops);
 353 }
 354
 355 static const struct file_operations proc_devinfo_operations = {
 356         .open           = devinfo_open,
 357         .read           = seq_read,
 358         .llseek         = seq_lseek,
 359         .release        = seq_release,
 360 };
 361
 362 static int vmstat_open(struct inode *inode, struct file *file)
 363 {
 364         return seq_open(file, &vmstat_op);
 365 }
 366 static const struct file_operations proc_vmstat_file_operations = {
 367         .open           = vmstat_open,
 368         .read           = seq_read,
 369         .llseek         = seq_lseek,
 370         .release        = seq_release,
 371 };
 372
 373 #ifdef CONFIG_PROC_HARDWARE
 374 static int hardware_read_proc(char *page, char **start, off_t off,
 375                                  int count, int *eof, void *data)
 376 {
 377         int len = get_hardware_list(page);
 378         return proc_calc_metrics(page, start, off, count, eof, len);
 379 }
 380 #endif
 381
 382 #ifdef CONFIG_STRAM_PROC
 383 static int stram_read_proc(char *page, char **start, off_t off,
 384                                  int count, int *eof, void *data)
 385 {
 386         int len = get_stram_list(page);
 387         return proc_calc_metrics(page, start, off, count, eof, len);
 388 }
 389 #endif
 390
 391 #ifdef CONFIG_BLOCK
 392 static int partitions_open(struct inode *inode, struct file *file)
 393 {
 394         return seq_open(file, &partitions_op);
 395 }
 396 static const struct file_operations proc_partitions_operations = {
 397         .open           = partitions_open,
 398         .read           = seq_read,
 399         .llseek         = seq_lseek,
 400         .release        = seq_release,
 401 };
 402
 403 static int diskstats_open(struct inode *inode, struct file *file)
 404 {
 405         return seq_open(file, &diskstats_op);
 406 }
 407 static const struct file_operations proc_diskstats_operations = {
 408         .open           = diskstats_open,
 409         .read           = seq_read,
 410         .llseek         = seq_lseek,
 411         .release        = seq_release,
 412 };
 413 #endif
 414
 415 #ifdef CONFIG_MODULES
 416 extern const struct seq_operations modules_op;
 417 static int modules_open(struct inode *inode, struct file *file)
 418 {
 419         return seq_open(file, &modules_op);
 420 }
 421 static const struct file_operations proc_modules_operations = {
 422         .open           = modules_open,
 423         .read           = seq_read,
 424         .llseek         = seq_lseek,
 425         .release        = seq_release,
 426 };
 427 #endif
 428
 429 #ifdef CONFIG_SLABINFO
 430 static int slabinfo_open(struct inode *inode, struct file *file)
 431 {
 432         return seq_open(file, &slabinfo_op);
 433 }
 434 static const struct file_operations proc_slabinfo_operations = {
 435         .open           = slabinfo_open,
 436         .read           = seq_read,
 437         .write          = slabinfo_write,
 438         .llseek         = seq_lseek,
 439         .release        = seq_release,
 440 };
 441
 442 #ifdef CONFIG_DEBUG_SLAB_LEAK
 443 extern const struct seq_operations slabstats_op;
 444 static int slabstats_open(struct inode *inode, struct file *file)
 445 {
 446         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 447         int ret = -ENOMEM;
 448         if (n) {
 449                 ret = seq_open(file, &slabstats_op);
 450                 if (!ret) {
 451                         struct seq_file *m = file->private_data;
 452                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 453                         m->private = n;
 454                         n = NULL;
 455                 }
 456                 kfree(n);
 457         }
 458         return ret;
 459 }
 460
 461 static const struct file_operations proc_slabstats_operations = {
 462         .open           = slabstats_open,
 463         .read           = seq_read,
 464         .llseek         = seq_lseek,
 465         .release        = seq_release_private,
 466 };
 467 #endif
 468 #endif
 469
 470 #ifdef CONFIG_MMU
 471 static int vmalloc_open(struct inode *inode, struct file *file)
 472 {
 473         unsigned int *ptr = NULL;
 474         int ret;
 475
 476         if (NUMA_BUILD)
 477                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 478         ret = seq_open(file, &vmalloc_op);
 479         if (!ret) {
 480                 struct seq_file *m = file->private_data;
 481                 m->private = ptr;
 482         } else
 483                 kfree(ptr);
 484         return ret;
 485 }
 486
 487 static const struct file_operations proc_vmalloc_operations = {
 488         .open           = vmalloc_open,
 489         .read           = seq_read,
 490         .llseek         = seq_lseek,
 491         .release        = seq_release_private,
 492 };
 493 #endif
 494
 495 #ifndef arch_irq_stat_cpu
 496 #define arch_irq_stat_cpu(cpu) 0
 497 #endif
 498 #ifndef arch_irq_stat
 499 #define arch_irq_stat() 0
 500 #endif
 501
 502 static int show_stat(struct seq_file *p, void *v)
 503 {
 504         int i;
 505         unsigned long jif;
 506         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 507         cputime64_t guest;
 508         u64 sum = 0;
 509         struct timespec boottime;
 510         unsigned int *per_irq_sum;
 511
 512         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 513         if (!per_irq_sum)
 514                 return -ENOMEM;
 515
 516         user = nice = system = idle = iowait =
 517                 irq = softirq = steal = cputime64_zero;
 518         guest = cputime64_zero;
 519         getboottime(&boottime);
 520         jif = boottime.tv_sec;
 521
 522         for_each_possible_cpu(i) {
 523                 int j;
 524
 525                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 526                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 527                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 528                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 529                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 530                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 531                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 532                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 533                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 534                 for (j = 0; j < NR_IRQS; j++) {
 535                         unsigned int temp = kstat_cpu(i).irqs[j];
 536                         sum += temp;
 537                         per_irq_sum[j] += temp;
 538                 }
 539                 sum += arch_irq_stat_cpu(i);
 540         }
 541         sum += arch_irq_stat();
 542
 543         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 544                 (unsigned long long)cputime64_to_clock_t(user),
 545                 (unsigned long long)cputime64_to_clock_t(nice),
 546                 (unsigned long long)cputime64_to_clock_t(system),
 547                 (unsigned long long)cputime64_to_clock_t(idle),
 548                 (unsigned long long)cputime64_to_clock_t(iowait),
 549                 (unsigned long long)cputime64_to_clock_t(irq),
 550                 (unsigned long long)cputime64_to_clock_t(softirq),
 551                 (unsigned long long)cputime64_to_clock_t(steal),
 552                 (unsigned long long)cputime64_to_clock_t(guest));
 553         for_each_online_cpu(i) {
 554
 555                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 556                 user = kstat_cpu(i).cpustat.user;
 557                 nice = kstat_cpu(i).cpustat.nice;
 558                 system = kstat_cpu(i).cpustat.system;
 559                 idle = kstat_cpu(i).cpustat.idle;
 560                 iowait = kstat_cpu(i).cpustat.iowait;
 561                 irq = kstat_cpu(i).cpustat.irq;
 562                 softirq = kstat_cpu(i).cpustat.softirq;
 563                 steal = kstat_cpu(i).cpustat.steal;
 564                 guest = kstat_cpu(i).cpustat.guest;
 565                 seq_printf(p,
 566                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 567                         i,
 568                         (unsigned long long)cputime64_to_clock_t(user),
 569                         (unsigned long long)cputime64_to_clock_t(nice),
 570                         (unsigned long long)cputime64_to_clock_t(system),
 571                         (unsigned long long)cputime64_to_clock_t(idle),
 572                         (unsigned long long)cputime64_to_clock_t(iowait),
 573                         (unsigned long long)cputime64_to_clock_t(irq),
 574                         (unsigned long long)cputime64_to_clock_t(softirq),
 575                         (unsigned long long)cputime64_to_clock_t(steal),
 576                         (unsigned long long)cputime64_to_clock_t(guest));
 577         }
 578         seq_printf(p, "intr %llu", (unsigned long long)sum);
 579
 580         for (i = 0; i < NR_IRQS; i++)
 581                 seq_printf(p, " %u", per_irq_sum[i]);
 582
 583         seq_printf(p,
 584                 "\nctxt %llu\n"
 585                 "btime %lu\n"
 586                 "processes %lu\n"
 587                 "procs_running %lu\n"
 588                 "procs_blocked %lu\n",
 589                 nr_context_switches(),
 590                 (unsigned long)jif,
 591                 total_forks,
 592                 nr_running(),
 593                 nr_iowait());
 594
 595         kfree(per_irq_sum);
 596         return 0;
 597 }
 598
 599 static int stat_open(struct inode *inode, struct file *file)
 600 {
 601         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 602         char *buf;
 603         struct seq_file *m;
 604         int res;
 605
 606         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 607         if (size > 128 * 1024)
 608                 size = 128 * 1024;
 609         buf = kmalloc(size, GFP_KERNEL);
 610         if (!buf)
 611                 return -ENOMEM;
 612
 613         res = single_open(file, show_stat, NULL);
 614         if (!res) {
 615                 m = file->private_data;
 616                 m->buf = buf;
 617                 m->size = size;
 618         } else
 619                 kfree(buf);
 620         return res;
 621 }
 622 static const struct file_operations proc_stat_operations = {
 623         .open           = stat_open,
 624         .read           = seq_read,
 625         .llseek         = seq_lseek,
 626         .release        = single_release,
 627 };
 628
 629 /*
 630  * /proc/interrupts
 631  */
 632 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 633 {
 634         return (*pos <= NR_IRQS) ? pos : NULL;
 635 }
 636
 637 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 638 {
 639         (*pos)++;
 640         if (*pos > NR_IRQS)
 641                 return NULL;
 642         return pos;
 643 }
 644
 645 static void int_seq_stop(struct seq_file *f, void *v)
 646 {
 647         /* Nothing to do */
 648 }
 649
 650
 651 static const struct seq_operations int_seq_ops = {
 652         .start = int_seq_start,
 653         .next  = int_seq_next,
 654         .stop  = int_seq_stop,
 655         .show  = show_interrupts
 656 };
 657
 658 static int interrupts_open(struct inode *inode, struct file *filp)
 659 {
 660         return seq_open(filp, &int_seq_ops);
 661 }
 662
 663 static const struct file_operations proc_interrupts_operations = {
 664         .open           = interrupts_open,
 665         .read           = seq_read,
 666         .llseek         = seq_lseek,
 667         .release        = seq_release,
 668 };
 669
 670 static int filesystems_read_proc(char *page, char **start, off_t off,
 671                                  int count, int *eof, void *data)
 672 {
 673         int len = get_filesystem_list(page);
 674         return proc_calc_metrics(page, start, off, count, eof, len);
 675 }
 676
 677 static int cmdline_read_proc(char *page, char **start, off_t off,
 678                                  int count, int *eof, void *data)
 679 {
 680         int len;
 681
 682         len = sprintf(page, "%s\n", saved_command_line);
 683         return proc_calc_metrics(page, start, off, count, eof, len);
 684 }
 685
 686 static int locks_open(struct inode *inode, struct file *filp)
 687 {
 688         return seq_open(filp, &locks_seq_operations);
 689 }
 690
 691 static const struct file_operations proc_locks_operations = {
 692         .open           = locks_open,
 693         .read           = seq_read,
 694         .llseek         = seq_lseek,
 695         .release        = seq_release,
 696 };
 697
 698 static int execdomains_read_proc(char *page, char **start, off_t off,
 699                                  int count, int *eof, void *data)
 700 {
 701         int len = get_exec_domain_list(page);
 702         return proc_calc_metrics(page, start, off, count, eof, len);
 703 }
 704
 705 #ifdef CONFIG_MAGIC_SYSRQ
 706 /*
 707  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 708  */
 709 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 710                                    size_t count, loff_t *ppos)
 711 {
 712         if (count) {
 713                 char c;
 714
 715                 if (get_user(c, buf))
 716                         return -EFAULT;
 717                 __handle_sysrq(c, NULL, 0);
 718         }
 719         return count;
 720 }
 721
 722 static const struct file_operations proc_sysrq_trigger_operations = {
 723         .write          = write_sysrq_trigger,
 724 };
 725 #endif
 726
 727 #ifdef CONFIG_PROC_PAGE_MONITOR
 728 #define KPMSIZE sizeof(u64)
 729 #define KPMMASK (KPMSIZE - 1)
 730 /* /proc/kpagecount - an array exposing page counts
 731  *
 732  * Each entry is a u64 representing the corresponding
 733  * physical page count.
 734  */
 735 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 736                              size_t count, loff_t *ppos)
 737 {
 738         u64 __user *out = (u64 __user *)buf;
 739         struct page *ppage;
 740         unsigned long src = *ppos;
 741         unsigned long pfn;
 742         ssize_t ret = 0;
 743         u64 pcount;
 744
 745         pfn = src / KPMSIZE;
 746         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 747         if (src & KPMMASK || count & KPMMASK)
 748                 return -EINVAL;
 749
 750         while (count > 0) {
 751                 ppage = NULL;
 752                 if (pfn_valid(pfn))
 753                         ppage = pfn_to_page(pfn);
 754                 pfn++;
 755                 if (!ppage)
 756                         pcount = 0;
 757                 else
 758                         pcount = page_mapcount(ppage);
 759
 760                 if (put_user(pcount, out++)) {
 761                         ret = -EFAULT;
 762                         break;
 763                 }
 764
 765                 count -= KPMSIZE;
 766         }
 767
 768         *ppos += (char __user *)out - buf;
 769         if (!ret)
 770                 ret = (char __user *)out - buf;
 771         return ret;
 772 }
 773
 774 static struct file_operations proc_kpagecount_operations = {
 775         .llseek = mem_lseek,
 776         .read = kpagecount_read,
 777 };
 778
 779 /* /proc/kpageflags - an array exposing page flags
 780  *
 781  * Each entry is a u64 representing the corresponding
 782  * physical page flags.
 783  */
 784
 785 /* These macros are used to decouple internal flags from exported ones */
 786
 787 #define KPF_LOCKED     0
 788 #define KPF_ERROR      1
 789 #define KPF_REFERENCED 2
 790 #define KPF_UPTODATE   3
 791 #define KPF_DIRTY      4
 792 #define KPF_LRU        5
 793 #define KPF_ACTIVE     6
 794 #define KPF_SLAB       7
 795 #define KPF_WRITEBACK  8
 796 #define KPF_RECLAIM    9
 797 #define KPF_BUDDY     10
 798
 799 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 800
 801 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 802                              size_t count, loff_t *ppos)
 803 {
 804         u64 __user *out = (u64 __user *)buf;
 805         struct page *ppage;
 806         unsigned long src = *ppos;
 807         unsigned long pfn;
 808         ssize_t ret = 0;
 809         u64 kflags, uflags;
 810
 811         pfn = src / KPMSIZE;
 812         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 813         if (src & KPMMASK || count & KPMMASK)
 814                 return -EINVAL;
 815
 816         while (count > 0) {
 817                 ppage = NULL;
 818                 if (pfn_valid(pfn))
 819                         ppage = pfn_to_page(pfn);
 820                 pfn++;
 821                 if (!ppage)
 822                         kflags = 0;
 823                 else
 824                         kflags = ppage->flags;
 825
 826                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 827                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 828                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 829                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 830                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 831                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 832                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 833                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 834                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 835                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 836                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 837
 838                 if (put_user(uflags, out++)) {
 839                         ret = -EFAULT;
 840                         break;
 841                 }
 842
 843                 count -= KPMSIZE;
 844         }
 845
 846         *ppos += (char __user *)out - buf;
 847         if (!ret)
 848                 ret = (char __user *)out - buf;
 849         return ret;
 850 }
 851
 852 static struct file_operations proc_kpageflags_operations = {
 853         .llseek = mem_lseek,
 854         .read = kpageflags_read,
 855 };
 856 #endif /* CONFIG_PROC_PAGE_MONITOR */
 857
 858 struct proc_dir_entry *proc_root_kcore;
 859
 860 void __init proc_misc_init(void)
 861 {
 862         static struct {
 863                 char *name;
 864                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 865         } *p, simple_ones[] = {
 866                 {"loadavg",     loadavg_read_proc},
 867                 {"uptime",      uptime_read_proc},
 868                 {"meminfo",     meminfo_read_proc},
 869                 {"version",     version_read_proc},
 870 #ifdef CONFIG_PROC_HARDWARE
 871                 {"hardware",    hardware_read_proc},
 872 #endif
 873 #ifdef CONFIG_STRAM_PROC
 874                 {"stram",       stram_read_proc},
 875 #endif
 876                 {"filesystems", filesystems_read_proc},
 877                 {"cmdline",     cmdline_read_proc},
 878                 {"execdomains", execdomains_read_proc},
 879                 {NULL,}
 880         };
 881         for (p = simple_ones; p->name; p++)
 882                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 883
 884         proc_symlink("mounts", NULL, "self/mounts");
 885
 886         /* And now for trickier ones */
 887 #ifdef CONFIG_PRINTK
 888         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 889 #endif
 890         proc_create("locks", 0, NULL, &proc_locks_operations);
 891         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 892         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 893 #ifdef CONFIG_BLOCK
 894         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 895 #endif
 896         proc_create("stat", 0, NULL, &proc_stat_operations);
 897         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 898 #ifdef CONFIG_SLABINFO
 899         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 900 #ifdef CONFIG_DEBUG_SLAB_LEAK
 901         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 902 #endif
 903 #endif
 904 #ifdef CONFIG_MMU
 905         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 906 #endif
 907         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 908         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 909         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 910         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 911 #ifdef CONFIG_BLOCK
 912         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 913 #endif
 914 #ifdef CONFIG_MODULES
 915         proc_create("modules", 0, NULL, &proc_modules_operations);
 916 #endif
 917 #ifdef CONFIG_SCHEDSTATS
 918         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 919 #endif
 920 #ifdef CONFIG_PROC_KCORE
 921         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 922         if (proc_root_kcore)
 923                 proc_root_kcore->size =
 924                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 925 #endif
 926 #ifdef CONFIG_PROC_PAGE_MONITOR
 927         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 928         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 929 #endif
 930 #ifdef CONFIG_PROC_VMCORE
 931         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 932 #endif
 933 #ifdef CONFIG_MAGIC_SYSRQ
 934         proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
 935 #endif
 936 }