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         unsigned int *ptr = NULL;
 468         int ret;
 469
 470         if (NUMA_BUILD)
 471                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 472         ret = seq_open(file, &vmalloc_op);
 473         if (!ret) {
 474                 struct seq_file *m = file->private_data;
 475                 m->private = ptr;
 476         } else
 477                 kfree(ptr);
 478         return ret;
 479 }
 480
 481 static const struct file_operations proc_vmalloc_operations = {
 482         .open           = vmalloc_open,
 483         .read           = seq_read,
 484         .llseek         = seq_lseek,
 485         .release        = seq_release_private,
 486 };
 487 #endif
 488
 489 #ifndef arch_irq_stat_cpu
 490 #define arch_irq_stat_cpu(cpu) 0
 491 #endif
 492 #ifndef arch_irq_stat
 493 #define arch_irq_stat() 0
 494 #endif
 495
 496 static int show_stat(struct seq_file *p, void *v)
 497 {
 498         int i;
 499         unsigned long jif;
 500         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 501         cputime64_t guest;
 502         u64 sum = 0;
 503         struct timespec boottime;
 504         unsigned int *per_irq_sum;
 505
 506         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 507         if (!per_irq_sum)
 508                 return -ENOMEM;
 509
 510         user = nice = system = idle = iowait =
 511                 irq = softirq = steal = cputime64_zero;
 512         guest = cputime64_zero;
 513         getboottime(&boottime);
 514         jif = boottime.tv_sec;
 515
 516         for_each_possible_cpu(i) {
 517                 int j;
 518
 519                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 520                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 521                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 522                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 523                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 524                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 525                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 526                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 527                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 528                 for (j = 0; j < NR_IRQS; j++) {
 529                         unsigned int temp = kstat_cpu(i).irqs[j];
 530                         sum += temp;
 531                         per_irq_sum[j] += temp;
 532                 }
 533                 sum += arch_irq_stat_cpu(i);
 534         }
 535         sum += arch_irq_stat();
 536
 537         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 538                 (unsigned long long)cputime64_to_clock_t(user),
 539                 (unsigned long long)cputime64_to_clock_t(nice),
 540                 (unsigned long long)cputime64_to_clock_t(system),
 541                 (unsigned long long)cputime64_to_clock_t(idle),
 542                 (unsigned long long)cputime64_to_clock_t(iowait),
 543                 (unsigned long long)cputime64_to_clock_t(irq),
 544                 (unsigned long long)cputime64_to_clock_t(softirq),
 545                 (unsigned long long)cputime64_to_clock_t(steal),
 546                 (unsigned long long)cputime64_to_clock_t(guest));
 547         for_each_online_cpu(i) {
 548
 549                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 550                 user = kstat_cpu(i).cpustat.user;
 551                 nice = kstat_cpu(i).cpustat.nice;
 552                 system = kstat_cpu(i).cpustat.system;
 553                 idle = kstat_cpu(i).cpustat.idle;
 554                 iowait = kstat_cpu(i).cpustat.iowait;
 555                 irq = kstat_cpu(i).cpustat.irq;
 556                 softirq = kstat_cpu(i).cpustat.softirq;
 557                 steal = kstat_cpu(i).cpustat.steal;
 558                 guest = kstat_cpu(i).cpustat.guest;
 559                 seq_printf(p,
 560                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 561                         i,
 562                         (unsigned long long)cputime64_to_clock_t(user),
 563                         (unsigned long long)cputime64_to_clock_t(nice),
 564                         (unsigned long long)cputime64_to_clock_t(system),
 565                         (unsigned long long)cputime64_to_clock_t(idle),
 566                         (unsigned long long)cputime64_to_clock_t(iowait),
 567                         (unsigned long long)cputime64_to_clock_t(irq),
 568                         (unsigned long long)cputime64_to_clock_t(softirq),
 569                         (unsigned long long)cputime64_to_clock_t(steal),
 570                         (unsigned long long)cputime64_to_clock_t(guest));
 571         }
 572         seq_printf(p, "intr %llu", (unsigned long long)sum);
 573
 574         for (i = 0; i < NR_IRQS; i++)
 575                 seq_printf(p, " %u", per_irq_sum[i]);
 576
 577         seq_printf(p,
 578                 "\nctxt %llu\n"
 579                 "btime %lu\n"
 580                 "processes %lu\n"
 581                 "procs_running %lu\n"
 582                 "procs_blocked %lu\n",
 583                 nr_context_switches(),
 584                 (unsigned long)jif,
 585                 total_forks,
 586                 nr_running(),
 587                 nr_iowait());
 588
 589         kfree(per_irq_sum);
 590         return 0;
 591 }
 592
 593 static int stat_open(struct inode *inode, struct file *file)
 594 {
 595         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 596         char *buf;
 597         struct seq_file *m;
 598         int res;
 599
 600         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 601         if (size > 128 * 1024)
 602                 size = 128 * 1024;
 603         buf = kmalloc(size, GFP_KERNEL);
 604         if (!buf)
 605                 return -ENOMEM;
 606
 607         res = single_open(file, show_stat, NULL);
 608         if (!res) {
 609                 m = file->private_data;
 610                 m->buf = buf;
 611                 m->size = size;
 612         } else
 613                 kfree(buf);
 614         return res;
 615 }
 616 static const struct file_operations proc_stat_operations = {
 617         .open           = stat_open,
 618         .read           = seq_read,
 619         .llseek         = seq_lseek,
 620         .release        = single_release,
 621 };
 622
 623 /*
 624  * /proc/interrupts
 625  */
 626 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 627 {
 628         return (*pos <= NR_IRQS) ? pos : NULL;
 629 }
 630
 631 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 632 {
 633         (*pos)++;
 634         if (*pos > NR_IRQS)
 635                 return NULL;
 636         return pos;
 637 }
 638
 639 static void int_seq_stop(struct seq_file *f, void *v)
 640 {
 641         /* Nothing to do */
 642 }
 643
 644
 645 static const struct seq_operations int_seq_ops = {
 646         .start = int_seq_start,
 647         .next  = int_seq_next,
 648         .stop  = int_seq_stop,
 649         .show  = show_interrupts
 650 };
 651
 652 static int interrupts_open(struct inode *inode, struct file *filp)
 653 {
 654         return seq_open(filp, &int_seq_ops);
 655 }
 656
 657 static const struct file_operations proc_interrupts_operations = {
 658         .open           = interrupts_open,
 659         .read           = seq_read,
 660         .llseek         = seq_lseek,
 661         .release        = seq_release,
 662 };
 663
 664 static int filesystems_read_proc(char *page, char **start, off_t off,
 665                                  int count, int *eof, void *data)
 666 {
 667         int len = get_filesystem_list(page);
 668         return proc_calc_metrics(page, start, off, count, eof, len);
 669 }
 670
 671 static int cmdline_read_proc(char *page, char **start, off_t off,
 672                                  int count, int *eof, void *data)
 673 {
 674         int len;
 675
 676         len = sprintf(page, "%s\n", saved_command_line);
 677         return proc_calc_metrics(page, start, off, count, eof, len);
 678 }
 679
 680 static int locks_open(struct inode *inode, struct file *filp)
 681 {
 682         return seq_open(filp, &locks_seq_operations);
 683 }
 684
 685 static const struct file_operations proc_locks_operations = {
 686         .open           = locks_open,
 687         .read           = seq_read,
 688         .llseek         = seq_lseek,
 689         .release        = seq_release,
 690 };
 691
 692 static int execdomains_read_proc(char *page, char **start, off_t off,
 693                                  int count, int *eof, void *data)
 694 {
 695         int len = get_exec_domain_list(page);
 696         return proc_calc_metrics(page, start, off, count, eof, len);
 697 }
 698
 699 #ifdef CONFIG_MAGIC_SYSRQ
 700 /*
 701  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 702  */
 703 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 704                                    size_t count, loff_t *ppos)
 705 {
 706         if (count) {
 707                 char c;
 708
 709                 if (get_user(c, buf))
 710                         return -EFAULT;
 711                 __handle_sysrq(c, NULL, 0);
 712         }
 713         return count;
 714 }
 715
 716 static const struct file_operations proc_sysrq_trigger_operations = {
 717         .write          = write_sysrq_trigger,
 718 };
 719 #endif
 720
 721 #ifdef CONFIG_PROC_PAGE_MONITOR
 722 #define KPMSIZE sizeof(u64)
 723 #define KPMMASK (KPMSIZE - 1)
 724 /* /proc/kpagecount - an array exposing page counts
 725  *
 726  * Each entry is a u64 representing the corresponding
 727  * physical page count.
 728  */
 729 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 730                              size_t count, loff_t *ppos)
 731 {
 732         u64 __user *out = (u64 __user *)buf;
 733         struct page *ppage;
 734         unsigned long src = *ppos;
 735         unsigned long pfn;
 736         ssize_t ret = 0;
 737         u64 pcount;
 738
 739         pfn = src / KPMSIZE;
 740         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 741         if (src & KPMMASK || count & KPMMASK)
 742                 return -EINVAL;
 743
 744         while (count > 0) {
 745                 ppage = NULL;
 746                 if (pfn_valid(pfn))
 747                         ppage = pfn_to_page(pfn);
 748                 pfn++;
 749                 if (!ppage)
 750                         pcount = 0;
 751                 else
 752                         pcount = page_mapcount(ppage);
 753
 754                 if (put_user(pcount, out++)) {
 755                         ret = -EFAULT;
 756                         break;
 757                 }
 758
 759                 count -= KPMSIZE;
 760         }
 761
 762         *ppos += (char __user *)out - buf;
 763         if (!ret)
 764                 ret = (char __user *)out - buf;
 765         return ret;
 766 }
 767
 768 static struct file_operations proc_kpagecount_operations = {
 769         .llseek = mem_lseek,
 770         .read = kpagecount_read,
 771 };
 772
 773 /* /proc/kpageflags - an array exposing page flags
 774  *
 775  * Each entry is a u64 representing the corresponding
 776  * physical page flags.
 777  */
 778
 779 /* These macros are used to decouple internal flags from exported ones */
 780
 781 #define KPF_LOCKED     0
 782 #define KPF_ERROR      1
 783 #define KPF_REFERENCED 2
 784 #define KPF_UPTODATE   3
 785 #define KPF_DIRTY      4
 786 #define KPF_LRU        5
 787 #define KPF_ACTIVE     6
 788 #define KPF_SLAB       7
 789 #define KPF_WRITEBACK  8
 790 #define KPF_RECLAIM    9
 791 #define KPF_BUDDY     10
 792
 793 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 794
 795 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 796                              size_t count, loff_t *ppos)
 797 {
 798         u64 __user *out = (u64 __user *)buf;
 799         struct page *ppage;
 800         unsigned long src = *ppos;
 801         unsigned long pfn;
 802         ssize_t ret = 0;
 803         u64 kflags, uflags;
 804
 805         pfn = src / KPMSIZE;
 806         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 807         if (src & KPMMASK || count & KPMMASK)
 808                 return -EINVAL;
 809
 810         while (count > 0) {
 811                 ppage = NULL;
 812                 if (pfn_valid(pfn))
 813                         ppage = pfn_to_page(pfn);
 814                 pfn++;
 815                 if (!ppage)
 816                         kflags = 0;
 817                 else
 818                         kflags = ppage->flags;
 819
 820                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 821                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 822                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 823                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 824                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 825                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 826                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 827                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 828                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 829                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 830                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 831
 832                 if (put_user(uflags, out++)) {
 833                         ret = -EFAULT;
 834                         break;
 835                 }
 836
 837                 count -= KPMSIZE;
 838         }
 839
 840         *ppos += (char __user *)out - buf;
 841         if (!ret)
 842                 ret = (char __user *)out - buf;
 843         return ret;
 844 }
 845
 846 static struct file_operations proc_kpageflags_operations = {
 847         .llseek = mem_lseek,
 848         .read = kpageflags_read,
 849 };
 850 #endif /* CONFIG_PROC_PAGE_MONITOR */
 851
 852 struct proc_dir_entry *proc_root_kcore;
 853
 854 void __init proc_misc_init(void)
 855 {
 856         static struct {
 857                 char *name;
 858                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 859         } *p, simple_ones[] = {
 860                 {"loadavg",     loadavg_read_proc},
 861                 {"uptime",      uptime_read_proc},
 862                 {"meminfo",     meminfo_read_proc},
 863                 {"version",     version_read_proc},
 864 #ifdef CONFIG_PROC_HARDWARE
 865                 {"hardware",    hardware_read_proc},
 866 #endif
 867 #ifdef CONFIG_STRAM_PROC
 868                 {"stram",       stram_read_proc},
 869 #endif
 870                 {"filesystems", filesystems_read_proc},
 871                 {"cmdline",     cmdline_read_proc},
 872                 {"execdomains", execdomains_read_proc},
 873                 {NULL,}
 874         };
 875         for (p = simple_ones; p->name; p++)
 876                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 877
 878         proc_symlink("mounts", NULL, "self/mounts");
 879
 880         /* And now for trickier ones */
 881 #ifdef CONFIG_PRINTK
 882         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 883 #endif
 884         proc_create("locks", 0, NULL, &proc_locks_operations);
 885         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 886         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 887 #ifdef CONFIG_BLOCK
 888         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 889 #endif
 890         proc_create("stat", 0, NULL, &proc_stat_operations);
 891         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 892 #ifdef CONFIG_SLABINFO
 893         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 894 #ifdef CONFIG_DEBUG_SLAB_LEAK
 895         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 896 #endif
 897 #endif
 898 #ifdef CONFIG_MMU
 899         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 900 #endif
 901         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 902         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 903         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 904         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 905 #ifdef CONFIG_BLOCK
 906         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 907 #endif
 908 #ifdef CONFIG_MODULES
 909         proc_create("modules", 0, NULL, &proc_modules_operations);
 910 #endif
 911 #ifdef CONFIG_SCHEDSTATS
 912         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 913 #endif
 914 #ifdef CONFIG_PROC_KCORE
 915         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 916         if (proc_root_kcore)
 917                 proc_root_kcore->size =
 918                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 919 #endif
 920 #ifdef CONFIG_PROC_PAGE_MONITOR
 921         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 922         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 923 #endif
 924 #ifdef CONFIG_PROC_VMCORE
 925         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 926 #endif
 927 #ifdef CONFIG_MAGIC_SYSRQ
 928         proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
 929 #endif
 930 }