fs/proc/proc_misc.c

   1 /*
   2  *  linux/fs/proc/proc_misc.c
   3  *
   4  *  linux/fs/proc/array.c
   5  *  Copyright (C) 1992  by Linus Torvalds
   6  *  based on ideas by Darren Senn
   7  *
   8  *  This used to be the part of array.c. See the rest of history and credits
   9  *  there. I took this into a separate file and switched the thing to generic
  10  *  proc_file_inode_operations, leaving in array.c only per-process stuff.
  11  *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
  12  *
  13  * Changes:
  14  * Fulton Green      :  Encapsulated position metric calculations.
  15  *                      <kernel@FultonGreen.com>
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/time.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/fs.h>
  24 #include <linux/tty.h>
  25 #include <linux/string.h>
  26 #include <linux/mman.h>
  27 #include <linux/quicklist.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/ioport.h>
  30 #include <linux/mm.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/irq.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/swap.h>
  36 #include <linux/slab.h>
  37 #include <linux/genhd.h>
  38 #include <linux/smp.h>
  39 #include <linux/signal.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/times.h>
  44 #include <linux/profile.h>
  45 #include <linux/utsname.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/hugetlb.h>
  48 #include <linux/jiffies.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/crash_dump.h>
  51 #include <linux/pid_namespace.h>
  52 #include <linux/bootmem.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/pgtable.h>
  55 #include <asm/io.h>
  56 #include <asm/tlb.h>
  57 #include <asm/div64.h>
  58 #include "internal.h"
  59
  60 /*
  61  * Warning: stuff below (imported functions) assumes that its output will fit
  62  * into one page. For some of those functions it may be wrong. Moreover, we
  63  * have a way to deal with that gracefully. Right now I used straightforward
  64  * wrappers, but this needs further analysis wrt potential overflows.
  65  */
  66 extern int get_hardware_list(char *);
  67 extern int get_stram_list(char *);
  68 extern int get_exec_domain_list(char *);
  69
  70 static int proc_calc_metrics(char *page, char **start, off_t off,
  71                                  int count, int *eof, int len)
  72 {
  73         if (len <= off+count) *eof = 1;
  74         *start = page + off;
  75         len -= off;
  76         if (len>count) len = count;
  77         if (len<0) len = 0;
  78         return len;
  79 }
  80
  81 static int uptime_read_proc(char *page, char **start, off_t off,
  82                                  int count, int *eof, void *data)
  83 {
  84         struct timespec uptime;
  85         struct timespec idle;
  86         int len;
  87         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
  88
  89         do_posix_clock_monotonic_gettime(&uptime);
  90         monotonic_to_bootbased(&uptime);
  91         cputime_to_timespec(idletime, &idle);
  92         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
  93                         (unsigned long) uptime.tv_sec,
  94                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
  95                         (unsigned long) idle.tv_sec,
  96                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
  97
  98         return proc_calc_metrics(page, start, off, count, eof, len);
  99 }
 100
 101 int __attribute__((weak)) arch_report_meminfo(char *page)
 102 {
 103         return 0;
 104 }
 105
 106 static int meminfo_read_proc(char *page, char **start, off_t off,
 107                                  int count, int *eof, void *data)
 108 {
 109         struct sysinfo i;
 110         int len;
 111         unsigned long committed;
 112         unsigned long allowed;
 113         struct vmalloc_info vmi;
 114         long cached;
 115         unsigned long pages[NR_LRU_LISTS];
 116         int lru;
 117
 118 /*
 119  * display in kilobytes.
 120  */
 121 #define K(x) ((x) << (PAGE_SHIFT - 10))
 122         si_meminfo(&i);
 123         si_swapinfo(&i);
 124         committed = atomic_long_read(&vm_committed_space);
 125         allowed = ((totalram_pages - hugetlb_total_pages())
 126                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 127
 128         cached = global_page_state(NR_FILE_PAGES) -
 129                         total_swapcache_pages - i.bufferram;
 130         if (cached < 0)
 131                 cached = 0;
 132
 133         get_vmalloc_info(&vmi);
 134
 135         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
 136                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
 137
 138         /*
 139          * Tagged format, for easy grepping and expansion.
 140          */
 141         len = sprintf(page,
 142                 "MemTotal:       %8lu kB\n"
 143                 "MemFree:        %8lu kB\n"
 144                 "Buffers:        %8lu kB\n"
 145                 "Cached:         %8lu kB\n"
 146                 "SwapCached:     %8lu kB\n"
 147                 "Active:         %8lu kB\n"
 148                 "Inactive:       %8lu kB\n"
 149                 "Active(anon):   %8lu kB\n"
 150                 "Inactive(anon): %8lu kB\n"
 151                 "Active(file):   %8lu kB\n"
 152                 "Inactive(file): %8lu kB\n"
 153 #ifdef CONFIG_UNEVICTABLE_LRU
 154                 "Unevictable:    %8lu kB\n"
 155                 "Mlocked:        %8lu kB\n"
 156 #endif
 157 #ifdef CONFIG_HIGHMEM
 158                 "HighTotal:      %8lu kB\n"
 159                 "HighFree:       %8lu kB\n"
 160                 "LowTotal:       %8lu kB\n"
 161                 "LowFree:        %8lu kB\n"
 162 #endif
 163                 "SwapTotal:      %8lu kB\n"
 164                 "SwapFree:       %8lu kB\n"
 165                 "Dirty:          %8lu kB\n"
 166                 "Writeback:      %8lu kB\n"
 167                 "AnonPages:      %8lu kB\n"
 168                 "Mapped:         %8lu kB\n"
 169                 "Slab:           %8lu kB\n"
 170                 "SReclaimable:   %8lu kB\n"
 171                 "SUnreclaim:     %8lu kB\n"
 172                 "PageTables:     %8lu kB\n"
 173 #ifdef CONFIG_QUICKLIST
 174                 "Quicklists:     %8lu kB\n"
 175 #endif
 176                 "NFS_Unstable:   %8lu kB\n"
 177                 "Bounce:         %8lu kB\n"
 178                 "WritebackTmp:   %8lu kB\n"
 179                 "CommitLimit:    %8lu kB\n"
 180                 "Committed_AS:   %8lu kB\n"
 181                 "VmallocTotal:   %8lu kB\n"
 182                 "VmallocUsed:    %8lu kB\n"
 183                 "VmallocChunk:   %8lu kB\n",
 184                 K(i.totalram),
 185                 K(i.freeram),
 186                 K(i.bufferram),
 187                 K(cached),
 188                 K(total_swapcache_pages),
 189                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 190                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 191                 K(pages[LRU_ACTIVE_ANON]),
 192                 K(pages[LRU_INACTIVE_ANON]),
 193                 K(pages[LRU_ACTIVE_FILE]),
 194                 K(pages[LRU_INACTIVE_FILE]),
 195 #ifdef CONFIG_UNEVICTABLE_LRU
 196                 K(pages[LRU_UNEVICTABLE]),
 197                 K(global_page_state(NR_MLOCK)),
 198 #endif
 199 #ifdef CONFIG_HIGHMEM
 200                 K(i.totalhigh),
 201                 K(i.freehigh),
 202                 K(i.totalram-i.totalhigh),
 203                 K(i.freeram-i.freehigh),
 204 #endif
 205                 K(i.totalswap),
 206                 K(i.freeswap),
 207                 K(global_page_state(NR_FILE_DIRTY)),
 208                 K(global_page_state(NR_WRITEBACK)),
 209                 K(global_page_state(NR_ANON_PAGES)),
 210                 K(global_page_state(NR_FILE_MAPPED)),
 211                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 212                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 213                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 214                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 215                 K(global_page_state(NR_PAGETABLE)),
 216 #ifdef CONFIG_QUICKLIST
 217                 K(quicklist_total_size()),
 218 #endif
 219                 K(global_page_state(NR_UNSTABLE_NFS)),
 220                 K(global_page_state(NR_BOUNCE)),
 221                 K(global_page_state(NR_WRITEBACK_TEMP)),
 222                 K(allowed),
 223                 K(committed),
 224                 (unsigned long)VMALLOC_TOTAL >> 10,
 225                 vmi.used >> 10,
 226                 vmi.largest_chunk >> 10
 227                 );
 228
 229                 len += hugetlb_report_meminfo(page + len);
 230
 231         len += arch_report_meminfo(page + len);
 232
 233         return proc_calc_metrics(page, start, off, count, eof, len);
 234 #undef K
 235 }
 236
 237 static int fragmentation_open(struct inode *inode, struct file *file)
 238 {
 239         (void)inode;
 240         return seq_open(file, &fragmentation_op);
 241 }
 242
 243 static const struct file_operations fragmentation_file_operations = {
 244         .open           = fragmentation_open,
 245         .read           = seq_read,
 246         .llseek         = seq_lseek,
 247         .release        = seq_release,
 248 };
 249
 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 static int zoneinfo_open(struct inode *inode, struct file *file)
 263 {
 264         return seq_open(file, &zoneinfo_op);
 265 }
 266
 267 static const struct file_operations proc_zoneinfo_file_operations = {
 268         .open           = zoneinfo_open,
 269         .read           = seq_read,
 270         .llseek         = seq_lseek,
 271         .release        = seq_release,
 272 };
 273
 274 static int version_read_proc(char *page, char **start, off_t off,
 275                                  int count, int *eof, void *data)
 276 {
 277         int len;
 278
 279         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 280                 utsname()->sysname,
 281                 utsname()->release,
 282                 utsname()->version);
 283         return proc_calc_metrics(page, start, off, count, eof, len);
 284 }
 285
 286 extern const struct seq_operations cpuinfo_op;
 287 static int cpuinfo_open(struct inode *inode, struct file *file)
 288 {
 289         return seq_open(file, &cpuinfo_op);
 290 }
 291
 292 static const struct file_operations proc_cpuinfo_operations = {
 293         .open           = cpuinfo_open,
 294         .read           = seq_read,
 295         .llseek         = seq_lseek,
 296         .release        = seq_release,
 297 };
 298
 299 static int devinfo_show(struct seq_file *f, void *v)
 300 {
 301         int i = *(loff_t *) v;
 302
 303         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 304                 if (i == 0)
 305                         seq_printf(f, "Character devices:\n");
 306                 chrdev_show(f, i);
 307         }
 308 #ifdef CONFIG_BLOCK
 309         else {
 310                 i -= CHRDEV_MAJOR_HASH_SIZE;
 311                 if (i == 0)
 312                         seq_printf(f, "\nBlock devices:\n");
 313                 blkdev_show(f, i);
 314         }
 315 #endif
 316         return 0;
 317 }
 318
 319 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 320 {
 321         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 322                 return pos;
 323         return NULL;
 324 }
 325
 326 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 327 {
 328         (*pos)++;
 329         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 330                 return NULL;
 331         return pos;
 332 }
 333
 334 static void devinfo_stop(struct seq_file *f, void *v)
 335 {
 336         /* Nothing to do */
 337 }
 338
 339 static const struct seq_operations devinfo_ops = {
 340         .start = devinfo_start,
 341         .next  = devinfo_next,
 342         .stop  = devinfo_stop,
 343         .show  = devinfo_show
 344 };
 345
 346 static int devinfo_open(struct inode *inode, struct file *filp)
 347 {
 348         return seq_open(filp, &devinfo_ops);
 349 }
 350
 351 static const struct file_operations proc_devinfo_operations = {
 352         .open           = devinfo_open,
 353         .read           = seq_read,
 354         .llseek         = seq_lseek,
 355         .release        = seq_release,
 356 };
 357
 358 static int vmstat_open(struct inode *inode, struct file *file)
 359 {
 360         return seq_open(file, &vmstat_op);
 361 }
 362 static const struct file_operations proc_vmstat_file_operations = {
 363         .open           = vmstat_open,
 364         .read           = seq_read,
 365         .llseek         = seq_lseek,
 366         .release        = seq_release,
 367 };
 368
 369 #ifdef CONFIG_PROC_HARDWARE
 370 static int hardware_read_proc(char *page, char **start, off_t off,
 371                                  int count, int *eof, void *data)
 372 {
 373         int len = get_hardware_list(page);
 374         return proc_calc_metrics(page, start, off, count, eof, len);
 375 }
 376 #endif
 377
 378 #ifdef CONFIG_STRAM_PROC
 379 static int stram_read_proc(char *page, char **start, off_t off,
 380                                  int count, int *eof, void *data)
 381 {
 382         int len = get_stram_list(page);
 383         return proc_calc_metrics(page, start, off, count, eof, len);
 384 }
 385 #endif
 386
 387 #ifdef CONFIG_BLOCK
 388 static int partitions_open(struct inode *inode, struct file *file)
 389 {
 390         return seq_open(file, &partitions_op);
 391 }
 392 static const struct file_operations proc_partitions_operations = {
 393         .open           = partitions_open,
 394         .read           = seq_read,
 395         .llseek         = seq_lseek,
 396         .release        = seq_release,
 397 };
 398
 399 static int diskstats_open(struct inode *inode, struct file *file)
 400 {
 401         return seq_open(file, &diskstats_op);
 402 }
 403 static const struct file_operations proc_diskstats_operations = {
 404         .open           = diskstats_open,
 405         .read           = seq_read,
 406         .llseek         = seq_lseek,
 407         .release        = seq_release,
 408 };
 409 #endif
 410
 411 #ifdef CONFIG_MODULES
 412 extern const struct seq_operations modules_op;
 413 static int modules_open(struct inode *inode, struct file *file)
 414 {
 415         return seq_open(file, &modules_op);
 416 }
 417 static const struct file_operations proc_modules_operations = {
 418         .open           = modules_open,
 419         .read           = seq_read,
 420         .llseek         = seq_lseek,
 421         .release        = seq_release,
 422 };
 423 #endif
 424
 425 #ifdef CONFIG_SLABINFO
 426 static int slabinfo_open(struct inode *inode, struct file *file)
 427 {
 428         return seq_open(file, &slabinfo_op);
 429 }
 430 static const struct file_operations proc_slabinfo_operations = {
 431         .open           = slabinfo_open,
 432         .read           = seq_read,
 433         .write          = slabinfo_write,
 434         .llseek         = seq_lseek,
 435         .release        = seq_release,
 436 };
 437
 438 #ifdef CONFIG_DEBUG_SLAB_LEAK
 439 extern const struct seq_operations slabstats_op;
 440 static int slabstats_open(struct inode *inode, struct file *file)
 441 {
 442         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 443         int ret = -ENOMEM;
 444         if (n) {
 445                 ret = seq_open(file, &slabstats_op);
 446                 if (!ret) {
 447                         struct seq_file *m = file->private_data;
 448                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 449                         m->private = n;
 450                         n = NULL;
 451                 }
 452                 kfree(n);
 453         }
 454         return ret;
 455 }
 456
 457 static const struct file_operations proc_slabstats_operations = {
 458         .open           = slabstats_open,
 459         .read           = seq_read,
 460         .llseek         = seq_lseek,
 461         .release        = seq_release_private,
 462 };
 463 #endif
 464 #endif
 465
 466 #ifdef CONFIG_MMU
 467 static int vmalloc_open(struct inode *inode, struct file *file)
 468 {
 469         unsigned int *ptr = NULL;
 470         int ret;
 471
 472         if (NUMA_BUILD)
 473                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 474         ret = seq_open(file, &vmalloc_op);
 475         if (!ret) {
 476                 struct seq_file *m = file->private_data;
 477                 m->private = ptr;
 478         } else
 479                 kfree(ptr);
 480         return ret;
 481 }
 482
 483 static const struct file_operations proc_vmalloc_operations = {
 484         .open           = vmalloc_open,
 485         .read           = seq_read,
 486         .llseek         = seq_lseek,
 487         .release        = seq_release_private,
 488 };
 489 #endif
 490
 491 #ifndef arch_irq_stat_cpu
 492 #define arch_irq_stat_cpu(cpu) 0
 493 #endif
 494 #ifndef arch_irq_stat
 495 #define arch_irq_stat() 0
 496 #endif
 497
 498 static int show_stat(struct seq_file *p, void *v)
 499 {
 500         int i, j;
 501         unsigned long jif;
 502         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 503         cputime64_t guest;
 504         u64 sum = 0;
 505         struct timespec boottime;
 506         unsigned int per_irq_sum;
 507
 508         user = nice = system = idle = iowait =
 509                 irq = softirq = steal = cputime64_zero;
 510         guest = cputime64_zero;
 511         getboottime(&boottime);
 512         jif = boottime.tv_sec;
 513
 514         for_each_possible_cpu(i) {
 515                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 516                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 517                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 518                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 519                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 520                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 521                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 522                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 523                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 524
 525                 for_each_irq_nr(j)
 526                         sum += kstat_irqs_cpu(j, i);
 527
 528                 sum += arch_irq_stat_cpu(i);
 529         }
 530         sum += arch_irq_stat();
 531
 532         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 533                 (unsigned long long)cputime64_to_clock_t(user),
 534                 (unsigned long long)cputime64_to_clock_t(nice),
 535                 (unsigned long long)cputime64_to_clock_t(system),
 536                 (unsigned long long)cputime64_to_clock_t(idle),
 537                 (unsigned long long)cputime64_to_clock_t(iowait),
 538                 (unsigned long long)cputime64_to_clock_t(irq),
 539                 (unsigned long long)cputime64_to_clock_t(softirq),
 540                 (unsigned long long)cputime64_to_clock_t(steal),
 541                 (unsigned long long)cputime64_to_clock_t(guest));
 542         for_each_online_cpu(i) {
 543
 544                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 545                 user = kstat_cpu(i).cpustat.user;
 546                 nice = kstat_cpu(i).cpustat.nice;
 547                 system = kstat_cpu(i).cpustat.system;
 548                 idle = kstat_cpu(i).cpustat.idle;
 549                 iowait = kstat_cpu(i).cpustat.iowait;
 550                 irq = kstat_cpu(i).cpustat.irq;
 551                 softirq = kstat_cpu(i).cpustat.softirq;
 552                 steal = kstat_cpu(i).cpustat.steal;
 553                 guest = kstat_cpu(i).cpustat.guest;
 554                 seq_printf(p,
 555                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 556                         i,
 557                         (unsigned long long)cputime64_to_clock_t(user),
 558                         (unsigned long long)cputime64_to_clock_t(nice),
 559                         (unsigned long long)cputime64_to_clock_t(system),
 560                         (unsigned long long)cputime64_to_clock_t(idle),
 561                         (unsigned long long)cputime64_to_clock_t(iowait),
 562                         (unsigned long long)cputime64_to_clock_t(irq),
 563                         (unsigned long long)cputime64_to_clock_t(softirq),
 564                         (unsigned long long)cputime64_to_clock_t(steal),
 565                         (unsigned long long)cputime64_to_clock_t(guest));
 566         }
 567         seq_printf(p, "intr %llu", (unsigned long long)sum);
 568
 569         /* sum again ? it could be updated? */
 570         for_each_irq_nr(j) {
 571                 per_irq_sum = 0;
 572
 573                 for_each_possible_cpu(i)
 574                         per_irq_sum += kstat_irqs_cpu(j, i);
 575
 576                 seq_printf(p, " %u", per_irq_sum);
 577         }
 578
 579         seq_printf(p,
 580                 "\nctxt %llu\n"
 581                 "btime %lu\n"
 582                 "processes %lu\n"
 583                 "procs_running %lu\n"
 584                 "procs_blocked %lu\n",
 585                 nr_context_switches(),
 586                 (unsigned long)jif,
 587                 total_forks,
 588                 nr_running(),
 589                 nr_iowait());
 590
 591         return 0;
 592 }
 593
 594 static int stat_open(struct inode *inode, struct file *file)
 595 {
 596         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 597         char *buf;
 598         struct seq_file *m;
 599         int res;
 600
 601         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 602         if (size > 128 * 1024)
 603                 size = 128 * 1024;
 604         buf = kmalloc(size, GFP_KERNEL);
 605         if (!buf)
 606                 return -ENOMEM;
 607
 608         res = single_open(file, show_stat, NULL);
 609         if (!res) {
 610                 m = file->private_data;
 611                 m->buf = buf;
 612                 m->size = size;
 613         } else
 614                 kfree(buf);
 615         return res;
 616 }
 617 static const struct file_operations proc_stat_operations = {
 618         .open           = stat_open,
 619         .read           = seq_read,
 620         .llseek         = seq_lseek,
 621         .release        = single_release,
 622 };
 623
 624 /*
 625  * /proc/interrupts
 626  */
 627 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 628 {
 629         return (*pos <= nr_irqs) ? pos : NULL;
 630 }
 631
 632
 633 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 634 {
 635         (*pos)++;
 636         return (*pos <= nr_irqs) ? pos : NULL;
 637 }
 638
 639 static void int_seq_stop(struct seq_file *f, void *v)
 640 {
 641         /* Nothing to do */
 642 }
 643
 644 static const struct seq_operations int_seq_ops = {
 645         .start = int_seq_start,
 646         .next  = int_seq_next,
 647         .stop  = int_seq_stop,
 648         .show  = show_interrupts
 649 };
 650
 651 static int interrupts_open(struct inode *inode, struct file *filp)
 652 {
 653         return seq_open(filp, &int_seq_ops);
 654 }
 655
 656 static const struct file_operations proc_interrupts_operations = {
 657         .open           = interrupts_open,
 658         .read           = seq_read,
 659         .llseek         = seq_lseek,
 660         .release        = seq_release,
 661 };
 662
 663 static int filesystems_read_proc(char *page, char **start, off_t off,
 664                                  int count, int *eof, void *data)
 665 {
 666         int len = get_filesystem_list(page);
 667         return proc_calc_metrics(page, start, off, count, eof, len);
 668 }
 669
 670 static int cmdline_read_proc(char *page, char **start, off_t off,
 671                                  int count, int *eof, void *data)
 672 {
 673         int len;
 674
 675         len = sprintf(page, "%s\n", saved_command_line);
 676         return proc_calc_metrics(page, start, off, count, eof, len);
 677 }
 678
 679 #ifdef CONFIG_FILE_LOCKING
 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 #endif /* CONFIG_FILE_LOCKING */
 692
 693 static int execdomains_read_proc(char *page, char **start, off_t off,
 694                                  int count, int *eof, void *data)
 695 {
 696         int len = get_exec_domain_list(page);
 697         return proc_calc_metrics(page, start, off, count, eof, len);
 698 }
 699
 700 #ifdef CONFIG_PROC_PAGE_MONITOR
 701 #define KPMSIZE sizeof(u64)
 702 #define KPMMASK (KPMSIZE - 1)
 703 /* /proc/kpagecount - an array exposing page counts
 704  *
 705  * Each entry is a u64 representing the corresponding
 706  * physical page count.
 707  */
 708 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 709                              size_t count, loff_t *ppos)
 710 {
 711         u64 __user *out = (u64 __user *)buf;
 712         struct page *ppage;
 713         unsigned long src = *ppos;
 714         unsigned long pfn;
 715         ssize_t ret = 0;
 716         u64 pcount;
 717
 718         pfn = src / KPMSIZE;
 719         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 720         if (src & KPMMASK || count & KPMMASK)
 721                 return -EINVAL;
 722
 723         while (count > 0) {
 724                 ppage = NULL;
 725                 if (pfn_valid(pfn))
 726                         ppage = pfn_to_page(pfn);
 727                 pfn++;
 728                 if (!ppage)
 729                         pcount = 0;
 730                 else
 731                         pcount = page_mapcount(ppage);
 732
 733                 if (put_user(pcount, out++)) {
 734                         ret = -EFAULT;
 735                         break;
 736                 }
 737
 738                 count -= KPMSIZE;
 739         }
 740
 741         *ppos += (char __user *)out - buf;
 742         if (!ret)
 743                 ret = (char __user *)out - buf;
 744         return ret;
 745 }
 746
 747 static struct file_operations proc_kpagecount_operations = {
 748         .llseek = mem_lseek,
 749         .read = kpagecount_read,
 750 };
 751
 752 /* /proc/kpageflags - an array exposing page flags
 753  *
 754  * Each entry is a u64 representing the corresponding
 755  * physical page flags.
 756  */
 757
 758 /* These macros are used to decouple internal flags from exported ones */
 759
 760 #define KPF_LOCKED     0
 761 #define KPF_ERROR      1
 762 #define KPF_REFERENCED 2
 763 #define KPF_UPTODATE   3
 764 #define KPF_DIRTY      4
 765 #define KPF_LRU        5
 766 #define KPF_ACTIVE     6
 767 #define KPF_SLAB       7
 768 #define KPF_WRITEBACK  8
 769 #define KPF_RECLAIM    9
 770 #define KPF_BUDDY     10
 771
 772 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 773
 774 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 775                              size_t count, loff_t *ppos)
 776 {
 777         u64 __user *out = (u64 __user *)buf;
 778         struct page *ppage;
 779         unsigned long src = *ppos;
 780         unsigned long pfn;
 781         ssize_t ret = 0;
 782         u64 kflags, uflags;
 783
 784         pfn = src / KPMSIZE;
 785         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 786         if (src & KPMMASK || count & KPMMASK)
 787                 return -EINVAL;
 788
 789         while (count > 0) {
 790                 ppage = NULL;
 791                 if (pfn_valid(pfn))
 792                         ppage = pfn_to_page(pfn);
 793                 pfn++;
 794                 if (!ppage)
 795                         kflags = 0;
 796                 else
 797                         kflags = ppage->flags;
 798
 799                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 800                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 801                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 802                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 803                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 804                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 805                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 806                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 807                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 808                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 809                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 810
 811                 if (put_user(uflags, out++)) {
 812                         ret = -EFAULT;
 813                         break;
 814                 }
 815
 816                 count -= KPMSIZE;
 817         }
 818
 819         *ppos += (char __user *)out - buf;
 820         if (!ret)
 821                 ret = (char __user *)out - buf;
 822         return ret;
 823 }
 824
 825 static struct file_operations proc_kpageflags_operations = {
 826         .llseek = mem_lseek,
 827         .read = kpageflags_read,
 828 };
 829 #endif /* CONFIG_PROC_PAGE_MONITOR */
 830
 831 struct proc_dir_entry *proc_root_kcore;
 832
 833 void __init proc_misc_init(void)
 834 {
 835         static struct {
 836                 char *name;
 837                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 838         } *p, simple_ones[] = {
 839                 {"uptime",      uptime_read_proc},
 840                 {"meminfo",     meminfo_read_proc},
 841                 {"version",     version_read_proc},
 842 #ifdef CONFIG_PROC_HARDWARE
 843                 {"hardware",    hardware_read_proc},
 844 #endif
 845 #ifdef CONFIG_STRAM_PROC
 846                 {"stram",       stram_read_proc},
 847 #endif
 848                 {"filesystems", filesystems_read_proc},
 849                 {"cmdline",     cmdline_read_proc},
 850                 {"execdomains", execdomains_read_proc},
 851                 {NULL,}
 852         };
 853         for (p = simple_ones; p->name; p++)
 854                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 855
 856         proc_symlink("mounts", NULL, "self/mounts");
 857
 858         /* And now for trickier ones */
 859 #ifdef CONFIG_PRINTK
 860         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 861 #endif
 862 #ifdef CONFIG_FILE_LOCKING
 863         proc_create("locks", 0, NULL, &proc_locks_operations);
 864 #endif
 865         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 866         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 867 #ifdef CONFIG_BLOCK
 868         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 869 #endif
 870         proc_create("stat", 0, NULL, &proc_stat_operations);
 871         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 872 #ifdef CONFIG_SLABINFO
 873         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 874 #ifdef CONFIG_DEBUG_SLAB_LEAK
 875         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 876 #endif
 877 #endif
 878 #ifdef CONFIG_MMU
 879         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 880 #endif
 881         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 882         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 883         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 884         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 885 #ifdef CONFIG_BLOCK
 886         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 887 #endif
 888 #ifdef CONFIG_MODULES
 889         proc_create("modules", 0, NULL, &proc_modules_operations);
 890 #endif
 891 #ifdef CONFIG_SCHEDSTATS
 892         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 893 #endif
 894 #ifdef CONFIG_PROC_KCORE
 895         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 896         if (proc_root_kcore)
 897                 proc_root_kcore->size =
 898                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 899 #endif
 900 #ifdef CONFIG_PROC_PAGE_MONITOR
 901         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 902         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 903 #endif
 904 #ifdef CONFIG_PROC_VMCORE
 905         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 906 #endif
 907 }