err.no Git - linux-2.6/blob - 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 static int fragmentation_open(struct inode *inode, struct file *file)
 236 {
 237         (void)inode;
 238         return seq_open(file, &fragmentation_op);
 239 }
 240
 241 static const struct file_operations fragmentation_file_operations = {
 242         .open           = fragmentation_open,
 243         .read           = seq_read,
 244         .llseek         = seq_lseek,
 245         .release        = seq_release,
 246 };
 247
 248 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 249 {
 250         return seq_open(file, &pagetypeinfo_op);
 251 }
 252
 253 static const struct file_operations pagetypeinfo_file_ops = {
 254         .open           = pagetypeinfo_open,
 255         .read           = seq_read,
 256         .llseek         = seq_lseek,
 257         .release        = seq_release,
 258 };
 259
 260 static int zoneinfo_open(struct inode *inode, struct file *file)
 261 {
 262         return seq_open(file, &zoneinfo_op);
 263 }
 264
 265 static const struct file_operations proc_zoneinfo_file_operations = {
 266         .open           = zoneinfo_open,
 267         .read           = seq_read,
 268         .llseek         = seq_lseek,
 269         .release        = seq_release,
 270 };
 271
 272 static int version_read_proc(char *page, char **start, off_t off,
 273                                  int count, int *eof, void *data)
 274 {
 275         int len;
 276
 277         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 278                 utsname()->sysname,
 279                 utsname()->release,
 280                 utsname()->version);
 281         return proc_calc_metrics(page, start, off, count, eof, len);
 282 }
 283
 284 extern const struct seq_operations cpuinfo_op;
 285 static int cpuinfo_open(struct inode *inode, struct file *file)
 286 {
 287         return seq_open(file, &cpuinfo_op);
 288 }
 289
 290 static const struct file_operations proc_cpuinfo_operations = {
 291         .open           = cpuinfo_open,
 292         .read           = seq_read,
 293         .llseek         = seq_lseek,
 294         .release        = seq_release,
 295 };
 296
 297 static int devinfo_show(struct seq_file *f, void *v)
 298 {
 299         int i = *(loff_t *) v;
 300
 301         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 302                 if (i == 0)
 303                         seq_printf(f, "Character devices:\n");
 304                 chrdev_show(f, i);
 305         }
 306 #ifdef CONFIG_BLOCK
 307         else {
 308                 i -= CHRDEV_MAJOR_HASH_SIZE;
 309                 if (i == 0)
 310                         seq_printf(f, "\nBlock devices:\n");
 311                 blkdev_show(f, i);
 312         }
 313 #endif
 314         return 0;
 315 }
 316
 317 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 318 {
 319         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 320                 return pos;
 321         return NULL;
 322 }
 323
 324 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 325 {
 326         (*pos)++;
 327         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 328                 return NULL;
 329         return pos;
 330 }
 331
 332 static void devinfo_stop(struct seq_file *f, void *v)
 333 {
 334         /* Nothing to do */
 335 }
 336
 337 static const struct seq_operations devinfo_ops = {
 338         .start = devinfo_start,
 339         .next  = devinfo_next,
 340         .stop  = devinfo_stop,
 341         .show  = devinfo_show
 342 };
 343
 344 static int devinfo_open(struct inode *inode, struct file *filp)
 345 {
 346         return seq_open(filp, &devinfo_ops);
 347 }
 348
 349 static const struct file_operations proc_devinfo_operations = {
 350         .open           = devinfo_open,
 351         .read           = seq_read,
 352         .llseek         = seq_lseek,
 353         .release        = seq_release,
 354 };
 355
 356 static int vmstat_open(struct inode *inode, struct file *file)
 357 {
 358         return seq_open(file, &vmstat_op);
 359 }
 360 static const struct file_operations proc_vmstat_file_operations = {
 361         .open           = vmstat_open,
 362         .read           = seq_read,
 363         .llseek         = seq_lseek,
 364         .release        = seq_release,
 365 };
 366
 367 #ifdef CONFIG_PROC_HARDWARE
 368 static int hardware_read_proc(char *page, char **start, off_t off,
 369                                  int count, int *eof, void *data)
 370 {
 371         int len = get_hardware_list(page);
 372         return proc_calc_metrics(page, start, off, count, eof, len);
 373 }
 374 #endif
 375
 376 #ifdef CONFIG_STRAM_PROC
 377 static int stram_read_proc(char *page, char **start, off_t off,
 378                                  int count, int *eof, void *data)
 379 {
 380         int len = get_stram_list(page);
 381         return proc_calc_metrics(page, start, off, count, eof, len);
 382 }
 383 #endif
 384
 385 #ifdef CONFIG_BLOCK
 386 static int partitions_open(struct inode *inode, struct file *file)
 387 {
 388         return seq_open(file, &partitions_op);
 389 }
 390 static const struct file_operations proc_partitions_operations = {
 391         .open           = partitions_open,
 392         .read           = seq_read,
 393         .llseek         = seq_lseek,
 394         .release        = seq_release,
 395 };
 396
 397 static int diskstats_open(struct inode *inode, struct file *file)
 398 {
 399         return seq_open(file, &diskstats_op);
 400 }
 401 static const struct file_operations proc_diskstats_operations = {
 402         .open           = diskstats_open,
 403         .read           = seq_read,
 404         .llseek         = seq_lseek,
 405         .release        = seq_release,
 406 };
 407 #endif
 408
 409 #ifdef CONFIG_MODULES
 410 extern const struct seq_operations modules_op;
 411 static int modules_open(struct inode *inode, struct file *file)
 412 {
 413         return seq_open(file, &modules_op);
 414 }
 415 static const struct file_operations proc_modules_operations = {
 416         .open           = modules_open,
 417         .read           = seq_read,
 418         .llseek         = seq_lseek,
 419         .release        = seq_release,
 420 };
 421 #endif
 422
 423 #ifdef CONFIG_SLABINFO
 424 static int slabinfo_open(struct inode *inode, struct file *file)
 425 {
 426         return seq_open(file, &slabinfo_op);
 427 }
 428 static const struct file_operations proc_slabinfo_operations = {
 429         .open           = slabinfo_open,
 430         .read           = seq_read,
 431         .write          = slabinfo_write,
 432         .llseek         = seq_lseek,
 433         .release        = seq_release,
 434 };
 435
 436 #ifdef CONFIG_DEBUG_SLAB_LEAK
 437 extern const struct seq_operations slabstats_op;
 438 static int slabstats_open(struct inode *inode, struct file *file)
 439 {
 440         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 441         int ret = -ENOMEM;
 442         if (n) {
 443                 ret = seq_open(file, &slabstats_op);
 444                 if (!ret) {
 445                         struct seq_file *m = file->private_data;
 446                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 447                         m->private = n;
 448                         n = NULL;
 449                 }
 450                 kfree(n);
 451         }
 452         return ret;
 453 }
 454
 455 static const struct file_operations proc_slabstats_operations = {
 456         .open           = slabstats_open,
 457         .read           = seq_read,
 458         .llseek         = seq_lseek,
 459         .release        = seq_release_private,
 460 };
 461 #endif
 462 #endif
 463
 464 #ifdef CONFIG_MMU
 465 static int vmalloc_open(struct inode *inode, struct file *file)
 466 {
 467         return seq_open(file, &vmalloc_op);
 468 }
 469
 470 static const struct file_operations proc_vmalloc_operations = {
 471         .open           = vmalloc_open,
 472         .read           = seq_read,
 473         .llseek         = seq_lseek,
 474         .release        = seq_release,
 475 };
 476 #endif
 477
 478 #ifndef arch_irq_stat_cpu
 479 #define arch_irq_stat_cpu(cpu) 0
 480 #endif
 481 #ifndef arch_irq_stat
 482 #define arch_irq_stat() 0
 483 #endif
 484
 485 static int show_stat(struct seq_file *p, void *v)
 486 {
 487         int i;
 488         unsigned long jif;
 489         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 490         cputime64_t guest;
 491         u64 sum = 0;
 492         struct timespec boottime;
 493         unsigned int *per_irq_sum;
 494
 495         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 496         if (!per_irq_sum)
 497                 return -ENOMEM;
 498
 499         user = nice = system = idle = iowait =
 500                 irq = softirq = steal = cputime64_zero;
 501         guest = cputime64_zero;
 502         getboottime(&boottime);
 503         jif = boottime.tv_sec;
 504
 505         for_each_possible_cpu(i) {
 506                 int j;
 507
 508                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 509                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 510                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 511                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 512                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 513                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 514                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 515                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 516                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 517                 for (j = 0; j < NR_IRQS; j++) {
 518                         unsigned int temp = kstat_cpu(i).irqs[j];
 519                         sum += temp;
 520                         per_irq_sum[j] += temp;
 521                 }
 522                 sum += arch_irq_stat_cpu(i);
 523         }
 524         sum += arch_irq_stat();
 525
 526         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 527                 (unsigned long long)cputime64_to_clock_t(user),
 528                 (unsigned long long)cputime64_to_clock_t(nice),
 529                 (unsigned long long)cputime64_to_clock_t(system),
 530                 (unsigned long long)cputime64_to_clock_t(idle),
 531                 (unsigned long long)cputime64_to_clock_t(iowait),
 532                 (unsigned long long)cputime64_to_clock_t(irq),
 533                 (unsigned long long)cputime64_to_clock_t(softirq),
 534                 (unsigned long long)cputime64_to_clock_t(steal),
 535                 (unsigned long long)cputime64_to_clock_t(guest));
 536         for_each_online_cpu(i) {
 537
 538                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 539                 user = kstat_cpu(i).cpustat.user;
 540                 nice = kstat_cpu(i).cpustat.nice;
 541                 system = kstat_cpu(i).cpustat.system;
 542                 idle = kstat_cpu(i).cpustat.idle;
 543                 iowait = kstat_cpu(i).cpustat.iowait;
 544                 irq = kstat_cpu(i).cpustat.irq;
 545                 softirq = kstat_cpu(i).cpustat.softirq;
 546                 steal = kstat_cpu(i).cpustat.steal;
 547                 guest = kstat_cpu(i).cpustat.guest;
 548                 seq_printf(p,
 549                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 550                         i,
 551                         (unsigned long long)cputime64_to_clock_t(user),
 552                         (unsigned long long)cputime64_to_clock_t(nice),
 553                         (unsigned long long)cputime64_to_clock_t(system),
 554                         (unsigned long long)cputime64_to_clock_t(idle),
 555                         (unsigned long long)cputime64_to_clock_t(iowait),
 556                         (unsigned long long)cputime64_to_clock_t(irq),
 557                         (unsigned long long)cputime64_to_clock_t(softirq),
 558                         (unsigned long long)cputime64_to_clock_t(steal),
 559                         (unsigned long long)cputime64_to_clock_t(guest));
 560         }
 561         seq_printf(p, "intr %llu", (unsigned long long)sum);
 562
 563         for (i = 0; i < NR_IRQS; i++)
 564                 seq_printf(p, " %u", per_irq_sum[i]);
 565
 566         seq_printf(p,
 567                 "\nctxt %llu\n"
 568                 "btime %lu\n"
 569                 "processes %lu\n"
 570                 "procs_running %lu\n"
 571                 "procs_blocked %lu\n",
 572                 nr_context_switches(),
 573                 (unsigned long)jif,
 574                 total_forks,
 575                 nr_running(),
 576                 nr_iowait());
 577
 578         kfree(per_irq_sum);
 579         return 0;
 580 }
 581
 582 static int stat_open(struct inode *inode, struct file *file)
 583 {
 584         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 585         char *buf;
 586         struct seq_file *m;
 587         int res;
 588
 589         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 590         if (size > 128 * 1024)
 591                 size = 128 * 1024;
 592         buf = kmalloc(size, GFP_KERNEL);
 593         if (!buf)
 594                 return -ENOMEM;
 595
 596         res = single_open(file, show_stat, NULL);
 597         if (!res) {
 598                 m = file->private_data;
 599                 m->buf = buf;
 600                 m->size = size;
 601         } else
 602                 kfree(buf);
 603         return res;
 604 }
 605 static const struct file_operations proc_stat_operations = {
 606         .open           = stat_open,
 607         .read           = seq_read,
 608         .llseek         = seq_lseek,
 609         .release        = single_release,
 610 };
 611
 612 /*
 613  * /proc/interrupts
 614  */
 615 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 616 {
 617         return (*pos <= NR_IRQS) ? pos : NULL;
 618 }
 619
 620 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 621 {
 622         (*pos)++;
 623         if (*pos > NR_IRQS)
 624                 return NULL;
 625         return pos;
 626 }
 627
 628 static void int_seq_stop(struct seq_file *f, void *v)
 629 {
 630         /* Nothing to do */
 631 }
 632
 633
 634 static const struct seq_operations int_seq_ops = {
 635         .start = int_seq_start,
 636         .next  = int_seq_next,
 637         .stop  = int_seq_stop,
 638         .show  = show_interrupts
 639 };
 640
 641 static int interrupts_open(struct inode *inode, struct file *filp)
 642 {
 643         return seq_open(filp, &int_seq_ops);
 644 }
 645
 646 static const struct file_operations proc_interrupts_operations = {
 647         .open           = interrupts_open,
 648         .read           = seq_read,
 649         .llseek         = seq_lseek,
 650         .release        = seq_release,
 651 };
 652
 653 static int filesystems_read_proc(char *page, char **start, off_t off,
 654                                  int count, int *eof, void *data)
 655 {
 656         int len = get_filesystem_list(page);
 657         return proc_calc_metrics(page, start, off, count, eof, len);
 658 }
 659
 660 static int cmdline_read_proc(char *page, char **start, off_t off,
 661                                  int count, int *eof, void *data)
 662 {
 663         int len;
 664
 665         len = sprintf(page, "%s\n", saved_command_line);
 666         return proc_calc_metrics(page, start, off, count, eof, len);
 667 }
 668
 669 static int locks_open(struct inode *inode, struct file *filp)
 670 {
 671         return seq_open(filp, &locks_seq_operations);
 672 }
 673
 674 static const struct file_operations proc_locks_operations = {
 675         .open           = locks_open,
 676         .read           = seq_read,
 677         .llseek         = seq_lseek,
 678         .release        = seq_release,
 679 };
 680
 681 static int execdomains_read_proc(char *page, char **start, off_t off,
 682                                  int count, int *eof, void *data)
 683 {
 684         int len = get_exec_domain_list(page);
 685         return proc_calc_metrics(page, start, off, count, eof, len);
 686 }
 687
 688 #ifdef CONFIG_MAGIC_SYSRQ
 689 /*
 690  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 691  */
 692 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 693                                    size_t count, loff_t *ppos)
 694 {
 695         if (count) {
 696                 char c;
 697
 698                 if (get_user(c, buf))
 699                         return -EFAULT;
 700                 __handle_sysrq(c, NULL, 0);
 701         }
 702         return count;
 703 }
 704
 705 static const struct file_operations proc_sysrq_trigger_operations = {
 706         .write          = write_sysrq_trigger,
 707 };
 708 #endif
 709
 710 #ifdef CONFIG_PROC_PAGE_MONITOR
 711 #define KPMSIZE sizeof(u64)
 712 #define KPMMASK (KPMSIZE - 1)
 713 /* /proc/kpagecount - an array exposing page counts
 714  *
 715  * Each entry is a u64 representing the corresponding
 716  * physical page count.
 717  */
 718 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 719                              size_t count, loff_t *ppos)
 720 {
 721         u64 __user *out = (u64 __user *)buf;
 722         struct page *ppage;
 723         unsigned long src = *ppos;
 724         unsigned long pfn;
 725         ssize_t ret = 0;
 726         u64 pcount;
 727
 728         pfn = src / KPMSIZE;
 729         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 730         if (src & KPMMASK || count & KPMMASK)
 731                 return -EINVAL;
 732
 733         while (count > 0) {
 734                 ppage = NULL;
 735                 if (pfn_valid(pfn))
 736                         ppage = pfn_to_page(pfn);
 737                 pfn++;
 738                 if (!ppage)
 739                         pcount = 0;
 740                 else
 741                         pcount = page_mapcount(ppage);
 742
 743                 if (put_user(pcount, out++)) {
 744                         ret = -EFAULT;
 745                         break;
 746                 }
 747
 748                 count -= KPMSIZE;
 749         }
 750
 751         *ppos += (char __user *)out - buf;
 752         if (!ret)
 753                 ret = (char __user *)out - buf;
 754         return ret;
 755 }
 756
 757 static struct file_operations proc_kpagecount_operations = {
 758         .llseek = mem_lseek,
 759         .read = kpagecount_read,
 760 };
 761
 762 /* /proc/kpageflags - an array exposing page flags
 763  *
 764  * Each entry is a u64 representing the corresponding
 765  * physical page flags.
 766  */
 767
 768 /* These macros are used to decouple internal flags from exported ones */
 769
 770 #define KPF_LOCKED     0
 771 #define KPF_ERROR      1
 772 #define KPF_REFERENCED 2
 773 #define KPF_UPTODATE   3
 774 #define KPF_DIRTY      4
 775 #define KPF_LRU        5
 776 #define KPF_ACTIVE     6
 777 #define KPF_SLAB       7
 778 #define KPF_WRITEBACK  8
 779 #define KPF_RECLAIM    9
 780 #define KPF_BUDDY     10
 781
 782 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 783
 784 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 785                              size_t count, loff_t *ppos)
 786 {
 787         u64 __user *out = (u64 __user *)buf;
 788         struct page *ppage;
 789         unsigned long src = *ppos;
 790         unsigned long pfn;
 791         ssize_t ret = 0;
 792         u64 kflags, uflags;
 793
 794         pfn = src / KPMSIZE;
 795         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 796         if (src & KPMMASK || count & KPMMASK)
 797                 return -EINVAL;
 798
 799         while (count > 0) {
 800                 ppage = NULL;
 801                 if (pfn_valid(pfn))
 802                         ppage = pfn_to_page(pfn);
 803                 pfn++;
 804                 if (!ppage)
 805                         kflags = 0;
 806                 else
 807                         kflags = ppage->flags;
 808
 809                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 810                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 811                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 812                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 813                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 814                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 815                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 816                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 817                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 818                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 819                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 820
 821                 if (put_user(uflags, out++)) {
 822                         ret = -EFAULT;
 823                         break;
 824                 }
 825
 826                 count -= KPMSIZE;
 827         }
 828
 829         *ppos += (char __user *)out - buf;
 830         if (!ret)
 831                 ret = (char __user *)out - buf;
 832         return ret;
 833 }
 834
 835 static struct file_operations proc_kpageflags_operations = {
 836         .llseek = mem_lseek,
 837         .read = kpageflags_read,
 838 };
 839 #endif /* CONFIG_PROC_PAGE_MONITOR */
 840
 841 struct proc_dir_entry *proc_root_kcore;
 842
 843 void __init proc_misc_init(void)
 844 {
 845         static struct {
 846                 char *name;
 847                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 848         } *p, simple_ones[] = {
 849                 {"loadavg",     loadavg_read_proc},
 850                 {"uptime",      uptime_read_proc},
 851                 {"meminfo",     meminfo_read_proc},
 852                 {"version",     version_read_proc},
 853 #ifdef CONFIG_PROC_HARDWARE
 854                 {"hardware",    hardware_read_proc},
 855 #endif
 856 #ifdef CONFIG_STRAM_PROC
 857                 {"stram",       stram_read_proc},
 858 #endif
 859                 {"filesystems", filesystems_read_proc},
 860                 {"cmdline",     cmdline_read_proc},
 861                 {"execdomains", execdomains_read_proc},
 862                 {NULL,}
 863         };
 864         for (p = simple_ones; p->name; p++)
 865                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 866
 867         proc_symlink("mounts", NULL, "self/mounts");
 868
 869         /* And now for trickier ones */
 870 #ifdef CONFIG_PRINTK
 871         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 872 #endif
 873         proc_create("locks", 0, NULL, &proc_locks_operations);
 874         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 875         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 876 #ifdef CONFIG_BLOCK
 877         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 878 #endif
 879         proc_create("stat", 0, NULL, &proc_stat_operations);
 880         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 881 #ifdef CONFIG_SLABINFO
 882         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 883 #ifdef CONFIG_DEBUG_SLAB_LEAK
 884         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 885 #endif
 886 #endif
 887 #ifdef CONFIG_MMU
 888         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 889 #endif
 890         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 891         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 892         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 893         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 894 #ifdef CONFIG_BLOCK
 895         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 896 #endif
 897 #ifdef CONFIG_MODULES
 898         proc_create("modules", 0, NULL, &proc_modules_operations);
 899 #endif
 900 #ifdef CONFIG_SCHEDSTATS
 901         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 902 #endif
 903 #ifdef CONFIG_PROC_KCORE
 904         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 905         if (proc_root_kcore)
 906                 proc_root_kcore->size =
 907                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 908 #endif
 909 #ifdef CONFIG_PROC_PAGE_MONITOR
 910         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 911         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 912 #endif
 913 #ifdef CONFIG_PROC_VMCORE
 914         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 915 #endif
 916 #ifdef CONFIG_MAGIC_SYSRQ
 917         proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
 918 #endif
 919 }