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/interrupt.h>
  33 #include <linux/swap.h>
  34 #include <linux/slab.h>
  35 #include <linux/genhd.h>
  36 #include <linux/smp.h>
  37 #include <linux/signal.h>
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/times.h>
  42 #include <linux/profile.h>
  43 #include <linux/utsname.h>
  44 #include <linux/blkdev.h>
  45 #include <linux/hugetlb.h>
  46 #include <linux/jiffies.h>
  47 #include <linux/sysrq.h>
  48 #include <linux/vmalloc.h>
  49 #include <linux/crash_dump.h>
  50 #include <linux/pid_namespace.h>
  51 #include <linux/bootmem.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/pgtable.h>
  54 #include <asm/io.h>
  55 #include <asm/tlb.h>
  56 #include <asm/div64.h>
  57 #include "internal.h"
  58
  59 #define LOAD_INT(x) ((x) >> FSHIFT)
  60 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  61 /*
  62  * Warning: stuff below (imported functions) assumes that its output will fit
  63  * into one page. For some of those functions it may be wrong. Moreover, we
  64  * have a way to deal with that gracefully. Right now I used straightforward
  65  * wrappers, but this needs further analysis wrt potential overflows.
  66  */
  67 extern int get_hardware_list(char *);
  68 extern int get_stram_list(char *);
  69 extern int get_exec_domain_list(char *);
  70 extern int get_dma_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                 "NFS_Unstable: %8lu kB\n"
 186                 "Bounce:       %8lu kB\n"
 187                 "WritebackTmp: %8lu kB\n"
 188                 "CommitLimit:  %8lu kB\n"
 189                 "Committed_AS: %8lu kB\n"
 190                 "VmallocTotal: %8lu kB\n"
 191                 "VmallocUsed:  %8lu kB\n"
 192                 "VmallocChunk: %8lu kB\n",
 193                 K(i.totalram),
 194                 K(i.freeram),
 195                 K(i.bufferram),
 196                 K(cached),
 197                 K(total_swapcache_pages),
 198                 K(global_page_state(NR_ACTIVE)),
 199                 K(global_page_state(NR_INACTIVE)),
 200 #ifdef CONFIG_HIGHMEM
 201                 K(i.totalhigh),
 202                 K(i.freehigh),
 203                 K(i.totalram-i.totalhigh),
 204                 K(i.freeram-i.freehigh),
 205 #endif
 206                 K(i.totalswap),
 207                 K(i.freeswap),
 208                 K(global_page_state(NR_FILE_DIRTY)),
 209                 K(global_page_state(NR_WRITEBACK)),
 210                 K(global_page_state(NR_ANON_PAGES)),
 211                 K(global_page_state(NR_FILE_MAPPED)),
 212                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 213                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 214                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 215                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 216                 K(global_page_state(NR_PAGETABLE)),
 217                 K(global_page_state(NR_UNSTABLE_NFS)),
 218                 K(global_page_state(NR_BOUNCE)),
 219                 K(global_page_state(NR_WRITEBACK_TEMP)),
 220                 K(allowed),
 221                 K(committed),
 222                 (unsigned long)VMALLOC_TOTAL >> 10,
 223                 vmi.used >> 10,
 224                 vmi.largest_chunk >> 10
 225                 );
 226
 227                 len += hugetlb_report_meminfo(page + len);
 228
 229         len += arch_report_meminfo(page + len);
 230
 231         return proc_calc_metrics(page, start, off, count, eof, len);
 232 #undef K
 233 }
 234
 235 extern const struct seq_operations fragmentation_op;
 236 static int fragmentation_open(struct inode *inode, struct file *file)
 237 {
 238         (void)inode;
 239         return seq_open(file, &fragmentation_op);
 240 }
 241
 242 static const struct file_operations fragmentation_file_operations = {
 243         .open           = fragmentation_open,
 244         .read           = seq_read,
 245         .llseek         = seq_lseek,
 246         .release        = seq_release,
 247 };
 248
 249 extern const struct seq_operations pagetypeinfo_op;
 250 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 251 {
 252         return seq_open(file, &pagetypeinfo_op);
 253 }
 254
 255 static const struct file_operations pagetypeinfo_file_ops = {
 256         .open           = pagetypeinfo_open,
 257         .read           = seq_read,
 258         .llseek         = seq_lseek,
 259         .release        = seq_release,
 260 };
 261
 262 extern const struct seq_operations zoneinfo_op;
 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 extern const struct seq_operations vmstat_op;
 360 static int vmstat_open(struct inode *inode, struct file *file)
 361 {
 362         return seq_open(file, &vmstat_op);
 363 }
 364 static const struct file_operations proc_vmstat_file_operations = {
 365         .open           = vmstat_open,
 366         .read           = seq_read,
 367         .llseek         = seq_lseek,
 368         .release        = seq_release,
 369 };
 370
 371 #ifdef CONFIG_PROC_HARDWARE
 372 static int hardware_read_proc(char *page, char **start, off_t off,
 373                                  int count, int *eof, void *data)
 374 {
 375         int len = get_hardware_list(page);
 376         return proc_calc_metrics(page, start, off, count, eof, len);
 377 }
 378 #endif
 379
 380 #ifdef CONFIG_STRAM_PROC
 381 static int stram_read_proc(char *page, char **start, off_t off,
 382                                  int count, int *eof, void *data)
 383 {
 384         int len = get_stram_list(page);
 385         return proc_calc_metrics(page, start, off, count, eof, len);
 386 }
 387 #endif
 388
 389 #ifdef CONFIG_BLOCK
 390 static int partitions_open(struct inode *inode, struct file *file)
 391 {
 392         return seq_open(file, &partitions_op);
 393 }
 394 static const struct file_operations proc_partitions_operations = {
 395         .open           = partitions_open,
 396         .read           = seq_read,
 397         .llseek         = seq_lseek,
 398         .release        = seq_release,
 399 };
 400
 401 static int diskstats_open(struct inode *inode, struct file *file)
 402 {
 403         return seq_open(file, &diskstats_op);
 404 }
 405 static const struct file_operations proc_diskstats_operations = {
 406         .open           = diskstats_open,
 407         .read           = seq_read,
 408         .llseek         = seq_lseek,
 409         .release        = seq_release,
 410 };
 411 #endif
 412
 413 #ifdef CONFIG_MODULES
 414 extern const struct seq_operations modules_op;
 415 static int modules_open(struct inode *inode, struct file *file)
 416 {
 417         return seq_open(file, &modules_op);
 418 }
 419 static const struct file_operations proc_modules_operations = {
 420         .open           = modules_open,
 421         .read           = seq_read,
 422         .llseek         = seq_lseek,
 423         .release        = seq_release,
 424 };
 425 #endif
 426
 427 #ifdef CONFIG_SLABINFO
 428 static int slabinfo_open(struct inode *inode, struct file *file)
 429 {
 430         return seq_open(file, &slabinfo_op);
 431 }
 432 static const struct file_operations proc_slabinfo_operations = {
 433         .open           = slabinfo_open,
 434         .read           = seq_read,
 435         .write          = slabinfo_write,
 436         .llseek         = seq_lseek,
 437         .release        = seq_release,
 438 };
 439
 440 #ifdef CONFIG_DEBUG_SLAB_LEAK
 441 extern const struct seq_operations slabstats_op;
 442 static int slabstats_open(struct inode *inode, struct file *file)
 443 {
 444         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 445         int ret = -ENOMEM;
 446         if (n) {
 447                 ret = seq_open(file, &slabstats_op);
 448                 if (!ret) {
 449                         struct seq_file *m = file->private_data;
 450                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 451                         m->private = n;
 452                         n = NULL;
 453                 }
 454                 kfree(n);
 455         }
 456         return ret;
 457 }
 458
 459 static const struct file_operations proc_slabstats_operations = {
 460         .open           = slabstats_open,
 461         .read           = seq_read,
 462         .llseek         = seq_lseek,
 463         .release        = seq_release_private,
 464 };
 465 #endif
 466 #endif
 467
 468 #ifdef CONFIG_MMU
 469 static int vmalloc_open(struct inode *inode, struct file *file)
 470 {
 471         return seq_open(file, &vmalloc_op);
 472 }
 473
 474 static const struct file_operations proc_vmalloc_operations = {
 475         .open           = vmalloc_open,
 476         .read           = seq_read,
 477         .llseek         = seq_lseek,
 478         .release        = seq_release,
 479 };
 480 #endif
 481
 482 static int show_stat(struct seq_file *p, void *v)
 483 {
 484         int i;
 485         unsigned long jif;
 486         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 487         cputime64_t guest;
 488         u64 sum = 0;
 489         struct timespec boottime;
 490         unsigned int *per_irq_sum;
 491
 492         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 493         if (!per_irq_sum)
 494                 return -ENOMEM;
 495
 496         user = nice = system = idle = iowait =
 497                 irq = softirq = steal = cputime64_zero;
 498         guest = cputime64_zero;
 499         getboottime(&boottime);
 500         jif = boottime.tv_sec;
 501
 502         for_each_possible_cpu(i) {
 503                 int j;
 504
 505                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 506                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 507                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 508                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 509                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 510                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 511                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 512                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 513                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 514                 for (j = 0; j < NR_IRQS; j++) {
 515                         unsigned int temp = kstat_cpu(i).irqs[j];
 516                         sum += temp;
 517                         per_irq_sum[j] += temp;
 518                 }
 519         }
 520
 521         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 522                 (unsigned long long)cputime64_to_clock_t(user),
 523                 (unsigned long long)cputime64_to_clock_t(nice),
 524                 (unsigned long long)cputime64_to_clock_t(system),
 525                 (unsigned long long)cputime64_to_clock_t(idle),
 526                 (unsigned long long)cputime64_to_clock_t(iowait),
 527                 (unsigned long long)cputime64_to_clock_t(irq),
 528                 (unsigned long long)cputime64_to_clock_t(softirq),
 529                 (unsigned long long)cputime64_to_clock_t(steal),
 530                 (unsigned long long)cputime64_to_clock_t(guest));
 531         for_each_online_cpu(i) {
 532
 533                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 534                 user = kstat_cpu(i).cpustat.user;
 535                 nice = kstat_cpu(i).cpustat.nice;
 536                 system = kstat_cpu(i).cpustat.system;
 537                 idle = kstat_cpu(i).cpustat.idle;
 538                 iowait = kstat_cpu(i).cpustat.iowait;
 539                 irq = kstat_cpu(i).cpustat.irq;
 540                 softirq = kstat_cpu(i).cpustat.softirq;
 541                 steal = kstat_cpu(i).cpustat.steal;
 542                 guest = kstat_cpu(i).cpustat.guest;
 543                 seq_printf(p,
 544                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 545                         i,
 546                         (unsigned long long)cputime64_to_clock_t(user),
 547                         (unsigned long long)cputime64_to_clock_t(nice),
 548                         (unsigned long long)cputime64_to_clock_t(system),
 549                         (unsigned long long)cputime64_to_clock_t(idle),
 550                         (unsigned long long)cputime64_to_clock_t(iowait),
 551                         (unsigned long long)cputime64_to_clock_t(irq),
 552                         (unsigned long long)cputime64_to_clock_t(softirq),
 553                         (unsigned long long)cputime64_to_clock_t(steal),
 554                         (unsigned long long)cputime64_to_clock_t(guest));
 555         }
 556         seq_printf(p, "intr %llu", (unsigned long long)sum);
 557
 558         for (i = 0; i < NR_IRQS; i++)
 559                 seq_printf(p, " %u", per_irq_sum[i]);
 560
 561         seq_printf(p,
 562                 "\nctxt %llu\n"
 563                 "btime %lu\n"
 564                 "processes %lu\n"
 565                 "procs_running %lu\n"
 566                 "procs_blocked %lu\n",
 567                 nr_context_switches(),
 568                 (unsigned long)jif,
 569                 total_forks,
 570                 nr_running(),
 571                 nr_iowait());
 572
 573         kfree(per_irq_sum);
 574         return 0;
 575 }
 576
 577 static int stat_open(struct inode *inode, struct file *file)
 578 {
 579         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 580         char *buf;
 581         struct seq_file *m;
 582         int res;
 583
 584         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 585         if (size > 128 * 1024)
 586                 size = 128 * 1024;
 587         buf = kmalloc(size, GFP_KERNEL);
 588         if (!buf)
 589                 return -ENOMEM;
 590
 591         res = single_open(file, show_stat, NULL);
 592         if (!res) {
 593                 m = file->private_data;
 594                 m->buf = buf;
 595                 m->size = size;
 596         } else
 597                 kfree(buf);
 598         return res;
 599 }
 600 static const struct file_operations proc_stat_operations = {
 601         .open           = stat_open,
 602         .read           = seq_read,
 603         .llseek         = seq_lseek,
 604         .release        = single_release,
 605 };
 606
 607 /*
 608  * /proc/interrupts
 609  */
 610 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 611 {
 612         return (*pos <= NR_IRQS) ? pos : NULL;
 613 }
 614
 615 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 616 {
 617         (*pos)++;
 618         if (*pos > NR_IRQS)
 619                 return NULL;
 620         return pos;
 621 }
 622
 623 static void int_seq_stop(struct seq_file *f, void *v)
 624 {
 625         /* Nothing to do */
 626 }
 627
 628
 629 static const struct seq_operations int_seq_ops = {
 630         .start = int_seq_start,
 631         .next  = int_seq_next,
 632         .stop  = int_seq_stop,
 633         .show  = show_interrupts
 634 };
 635
 636 static int interrupts_open(struct inode *inode, struct file *filp)
 637 {
 638         return seq_open(filp, &int_seq_ops);
 639 }
 640
 641 static const struct file_operations proc_interrupts_operations = {
 642         .open           = interrupts_open,
 643         .read           = seq_read,
 644         .llseek         = seq_lseek,
 645         .release        = seq_release,
 646 };
 647
 648 static int filesystems_read_proc(char *page, char **start, off_t off,
 649                                  int count, int *eof, void *data)
 650 {
 651         int len = get_filesystem_list(page);
 652         return proc_calc_metrics(page, start, off, count, eof, len);
 653 }
 654
 655 static int cmdline_read_proc(char *page, char **start, off_t off,
 656                                  int count, int *eof, void *data)
 657 {
 658         int len;
 659
 660         len = sprintf(page, "%s\n", saved_command_line);
 661         return proc_calc_metrics(page, start, off, count, eof, len);
 662 }
 663
 664 static int locks_open(struct inode *inode, struct file *filp)
 665 {
 666         return seq_open(filp, &locks_seq_operations);
 667 }
 668
 669 static const struct file_operations proc_locks_operations = {
 670         .open           = locks_open,
 671         .read           = seq_read,
 672         .llseek         = seq_lseek,
 673         .release        = seq_release,
 674 };
 675
 676 static int execdomains_read_proc(char *page, char **start, off_t off,
 677                                  int count, int *eof, void *data)
 678 {
 679         int len = get_exec_domain_list(page);
 680         return proc_calc_metrics(page, start, off, count, eof, len);
 681 }
 682
 683 #ifdef CONFIG_MAGIC_SYSRQ
 684 /*
 685  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 686  */
 687 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 688                                    size_t count, loff_t *ppos)
 689 {
 690         if (count) {
 691                 char c;
 692
 693                 if (get_user(c, buf))
 694                         return -EFAULT;
 695                 __handle_sysrq(c, NULL, 0);
 696         }
 697         return count;
 698 }
 699
 700 static const struct file_operations proc_sysrq_trigger_operations = {
 701         .write          = write_sysrq_trigger,
 702 };
 703 #endif
 704
 705 #ifdef CONFIG_PROC_PAGE_MONITOR
 706 #define KPMSIZE sizeof(u64)
 707 #define KPMMASK (KPMSIZE - 1)
 708 /* /proc/kpagecount - an array exposing page counts
 709  *
 710  * Each entry is a u64 representing the corresponding
 711  * physical page count.
 712  */
 713 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 714                              size_t count, loff_t *ppos)
 715 {
 716         u64 __user *out = (u64 __user *)buf;
 717         struct page *ppage;
 718         unsigned long src = *ppos;
 719         unsigned long pfn;
 720         ssize_t ret = 0;
 721         u64 pcount;
 722
 723         pfn = src / KPMSIZE;
 724         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 725         if (src & KPMMASK || count & KPMMASK)
 726                 return -EINVAL;
 727
 728         while (count > 0) {
 729                 ppage = NULL;
 730                 if (pfn_valid(pfn))
 731                         ppage = pfn_to_page(pfn);
 732                 pfn++;
 733                 if (!ppage)
 734                         pcount = 0;
 735                 else
 736                         pcount = page_mapcount(ppage);
 737
 738                 if (put_user(pcount, out++)) {
 739                         ret = -EFAULT;
 740                         break;
 741                 }
 742
 743                 count -= KPMSIZE;
 744         }
 745
 746         *ppos += (char __user *)out - buf;
 747         if (!ret)
 748                 ret = (char __user *)out - buf;
 749         return ret;
 750 }
 751
 752 static struct file_operations proc_kpagecount_operations = {
 753         .llseek = mem_lseek,
 754         .read = kpagecount_read,
 755 };
 756
 757 /* /proc/kpageflags - an array exposing page flags
 758  *
 759  * Each entry is a u64 representing the corresponding
 760  * physical page flags.
 761  */
 762
 763 /* These macros are used to decouple internal flags from exported ones */
 764
 765 #define KPF_LOCKED     0
 766 #define KPF_ERROR      1
 767 #define KPF_REFERENCED 2
 768 #define KPF_UPTODATE   3
 769 #define KPF_DIRTY      4
 770 #define KPF_LRU        5
 771 #define KPF_ACTIVE     6
 772 #define KPF_SLAB       7
 773 #define KPF_WRITEBACK  8
 774 #define KPF_RECLAIM    9
 775 #define KPF_BUDDY     10
 776
 777 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 778
 779 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 780                              size_t count, loff_t *ppos)
 781 {
 782         u64 __user *out = (u64 __user *)buf;
 783         struct page *ppage;
 784         unsigned long src = *ppos;
 785         unsigned long pfn;
 786         ssize_t ret = 0;
 787         u64 kflags, uflags;
 788
 789         pfn = src / KPMSIZE;
 790         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 791         if (src & KPMMASK || count & KPMMASK)
 792                 return -EINVAL;
 793
 794         while (count > 0) {
 795                 ppage = NULL;
 796                 if (pfn_valid(pfn))
 797                         ppage = pfn_to_page(pfn);
 798                 pfn++;
 799                 if (!ppage)
 800                         kflags = 0;
 801                 else
 802                         kflags = ppage->flags;
 803
 804                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 805                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 806                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 807                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 808                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 809                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 810                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 811                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 812                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 813                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 814                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 815
 816                 if (put_user(uflags, out++)) {
 817                         ret = -EFAULT;
 818                         break;
 819                 }
 820
 821                 count -= KPMSIZE;
 822         }
 823
 824         *ppos += (char __user *)out - buf;
 825         if (!ret)
 826                 ret = (char __user *)out - buf;
 827         return ret;
 828 }
 829
 830 static struct file_operations proc_kpageflags_operations = {
 831         .llseek = mem_lseek,
 832         .read = kpageflags_read,
 833 };
 834 #endif /* CONFIG_PROC_PAGE_MONITOR */
 835
 836 struct proc_dir_entry *proc_root_kcore;
 837
 838 void __init proc_misc_init(void)
 839 {
 840         static struct {
 841                 char *name;
 842                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 843         } *p, simple_ones[] = {
 844                 {"loadavg",     loadavg_read_proc},
 845                 {"uptime",      uptime_read_proc},
 846                 {"meminfo",     meminfo_read_proc},
 847                 {"version",     version_read_proc},
 848 #ifdef CONFIG_PROC_HARDWARE
 849                 {"hardware",    hardware_read_proc},
 850 #endif
 851 #ifdef CONFIG_STRAM_PROC
 852                 {"stram",       stram_read_proc},
 853 #endif
 854                 {"filesystems", filesystems_read_proc},
 855                 {"cmdline",     cmdline_read_proc},
 856                 {"execdomains", execdomains_read_proc},
 857                 {NULL,}
 858         };
 859         for (p = simple_ones; p->name; p++)
 860                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 861
 862         proc_symlink("mounts", NULL, "self/mounts");
 863
 864         /* And now for trickier ones */
 865 #ifdef CONFIG_PRINTK
 866         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 867 #endif
 868         proc_create("locks", 0, NULL, &proc_locks_operations);
 869         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 870         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 871 #ifdef CONFIG_BLOCK
 872         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 873 #endif
 874         proc_create("stat", 0, NULL, &proc_stat_operations);
 875         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 876 #ifdef CONFIG_SLABINFO
 877         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 878 #ifdef CONFIG_DEBUG_SLAB_LEAK
 879         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 880 #endif
 881 #endif
 882 #ifdef CONFIG_MMU
 883         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 884 #endif
 885         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 886         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 887         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 888         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 889 #ifdef CONFIG_BLOCK
 890         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 891 #endif
 892 #ifdef CONFIG_MODULES
 893         proc_create("modules", 0, NULL, &proc_modules_operations);
 894 #endif
 895 #ifdef CONFIG_SCHEDSTATS
 896         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 897 #endif
 898 #ifdef CONFIG_PROC_KCORE
 899         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 900         if (proc_root_kcore)
 901                 proc_root_kcore->size =
 902                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 903 #endif
 904 #ifdef CONFIG_PROC_PAGE_MONITOR
 905         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 906         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 907 #endif
 908 #ifdef CONFIG_PROC_VMCORE
 909         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 910 #endif
 911 #ifdef CONFIG_MAGIC_SYSRQ
 912         proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
 913 #endif
 914 }