fs/proc/proc_misc.c

   1 /*
   2  *  linux/fs/proc/proc_misc.c
   3  *
   4  *  linux/fs/proc/array.c
   5  *  Copyright (C) 1992  by Linus Torvalds
   6  *  based on ideas by Darren Senn
   7  *
   8  *  This used to be the part of array.c. See the rest of history and credits
   9  *  there. I took this into a separate file and switched the thing to generic
  10  *  proc_file_inode_operations, leaving in array.c only per-process stuff.
  11  *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
  12  *
  13  * Changes:
  14  * Fulton Green      :  Encapsulated position metric calculations.
  15  *                      <kernel@FultonGreen.com>
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/time.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/fs.h>
  24 #include <linux/tty.h>
  25 #include <linux/string.h>
  26 #include <linux/mman.h>
  27 #include <linux/quicklist.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/ioport.h>
  30 #include <linux/mm.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/swap.h>
  35 #include <linux/slab.h>
  36 #include <linux/genhd.h>
  37 #include <linux/smp.h>
  38 #include <linux/signal.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/times.h>
  43 #include <linux/profile.h>
  44 #include <linux/utsname.h>
  45 #include <linux/blkdev.h>
  46 #include <linux/hugetlb.h>
  47 #include <linux/jiffies.h>
  48 #include <linux/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
  71 static int proc_calc_metrics(char *page, char **start, off_t off,
  72                                  int count, int *eof, int len)
  73 {
  74         if (len <= off+count) *eof = 1;
  75         *start = page + off;
  76         len -= off;
  77         if (len>count) len = count;
  78         if (len<0) len = 0;
  79         return len;
  80 }
  81
  82 static int loadavg_read_proc(char *page, char **start, off_t off,
  83                                  int count, int *eof, void *data)
  84 {
  85         int a, b, c;
  86         int len;
  87         unsigned long seq;
  88
  89         do {
  90                 seq = read_seqbegin(&xtime_lock);
  91                 a = avenrun[0] + (FIXED_1/200);
  92                 b = avenrun[1] + (FIXED_1/200);
  93                 c = avenrun[2] + (FIXED_1/200);
  94         } while (read_seqretry(&xtime_lock, seq));
  95
  96         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  97                 LOAD_INT(a), LOAD_FRAC(a),
  98                 LOAD_INT(b), LOAD_FRAC(b),
  99                 LOAD_INT(c), LOAD_FRAC(c),
 100                 nr_running(), nr_threads,
 101                 task_active_pid_ns(current)->last_pid);
 102         return proc_calc_metrics(page, start, off, count, eof, len);
 103 }
 104
 105 static int uptime_read_proc(char *page, char **start, off_t off,
 106                                  int count, int *eof, void *data)
 107 {
 108         struct timespec uptime;
 109         struct timespec idle;
 110         int len;
 111         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 112
 113         do_posix_clock_monotonic_gettime(&uptime);
 114         monotonic_to_bootbased(&uptime);
 115         cputime_to_timespec(idletime, &idle);
 116         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 117                         (unsigned long) uptime.tv_sec,
 118                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 119                         (unsigned long) idle.tv_sec,
 120                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 121
 122         return proc_calc_metrics(page, start, off, count, eof, len);
 123 }
 124
 125 int __attribute__((weak)) arch_report_meminfo(char *page)
 126 {
 127         return 0;
 128 }
 129
 130 static int meminfo_read_proc(char *page, char **start, off_t off,
 131                                  int count, int *eof, void *data)
 132 {
 133         struct sysinfo i;
 134         int len;
 135         unsigned long committed;
 136         unsigned long allowed;
 137         struct vmalloc_info vmi;
 138         long cached;
 139
 140 /*
 141  * display in kilobytes.
 142  */
 143 #define K(x) ((x) << (PAGE_SHIFT - 10))
 144         si_meminfo(&i);
 145         si_swapinfo(&i);
 146         committed = atomic_long_read(&vm_committed_space);
 147         allowed = ((totalram_pages - hugetlb_total_pages())
 148                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 149
 150         cached = global_page_state(NR_FILE_PAGES) -
 151                         total_swapcache_pages - i.bufferram;
 152         if (cached < 0)
 153                 cached = 0;
 154
 155         get_vmalloc_info(&vmi);
 156
 157         /*
 158          * Tagged format, for easy grepping and expansion.
 159          */
 160         len = sprintf(page,
 161                 "MemTotal:     %8lu kB\n"
 162                 "MemFree:      %8lu kB\n"
 163                 "Buffers:      %8lu kB\n"
 164                 "Cached:       %8lu kB\n"
 165                 "SwapCached:   %8lu kB\n"
 166                 "Active:       %8lu kB\n"
 167                 "Inactive:     %8lu kB\n"
 168 #ifdef CONFIG_HIGHMEM
 169                 "HighTotal:    %8lu kB\n"
 170                 "HighFree:     %8lu kB\n"
 171                 "LowTotal:     %8lu kB\n"
 172                 "LowFree:      %8lu kB\n"
 173 #endif
 174                 "SwapTotal:    %8lu kB\n"
 175                 "SwapFree:     %8lu kB\n"
 176                 "Dirty:        %8lu kB\n"
 177                 "Writeback:    %8lu kB\n"
 178                 "AnonPages:    %8lu kB\n"
 179                 "Mapped:       %8lu kB\n"
 180                 "Slab:         %8lu kB\n"
 181                 "SReclaimable: %8lu kB\n"
 182                 "SUnreclaim:   %8lu kB\n"
 183                 "PageTables:   %8lu kB\n"
 184 #ifdef CONFIG_QUICKLIST
 185                 "Quicklists:   %8lu kB\n"
 186 #endif
 187                 "NFS_Unstable: %8lu kB\n"
 188                 "Bounce:       %8lu kB\n"
 189                 "WritebackTmp: %8lu kB\n"
 190                 "CommitLimit:  %8lu kB\n"
 191                 "Committed_AS: %8lu kB\n"
 192                 "VmallocTotal: %8lu kB\n"
 193                 "VmallocUsed:  %8lu kB\n"
 194                 "VmallocChunk: %8lu kB\n",
 195                 K(i.totalram),
 196                 K(i.freeram),
 197                 K(i.bufferram),
 198                 K(cached),
 199                 K(total_swapcache_pages),
 200                 K(global_page_state(NR_ACTIVE)),
 201                 K(global_page_state(NR_INACTIVE)),
 202 #ifdef CONFIG_HIGHMEM
 203                 K(i.totalhigh),
 204                 K(i.freehigh),
 205                 K(i.totalram-i.totalhigh),
 206                 K(i.freeram-i.freehigh),
 207 #endif
 208                 K(i.totalswap),
 209                 K(i.freeswap),
 210                 K(global_page_state(NR_FILE_DIRTY)),
 211                 K(global_page_state(NR_WRITEBACK)),
 212                 K(global_page_state(NR_ANON_PAGES)),
 213                 K(global_page_state(NR_FILE_MAPPED)),
 214                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 215                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 216                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 217                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 218                 K(global_page_state(NR_PAGETABLE)),
 219 #ifdef CONFIG_QUICKLIST
 220                 K(quicklist_total_size()),
 221 #endif
 222                 K(global_page_state(NR_UNSTABLE_NFS)),
 223                 K(global_page_state(NR_BOUNCE)),
 224                 K(global_page_state(NR_WRITEBACK_TEMP)),
 225                 K(allowed),
 226                 K(committed),
 227                 (unsigned long)VMALLOC_TOTAL >> 10,
 228                 vmi.used >> 10,
 229                 vmi.largest_chunk >> 10
 230                 );
 231
 232                 len += hugetlb_report_meminfo(page + len);
 233
 234         len += arch_report_meminfo(page + len);
 235
 236         return proc_calc_metrics(page, start, off, count, eof, len);
 237 #undef K
 238 }
 239
 240 static int fragmentation_open(struct inode *inode, struct file *file)
 241 {
 242         (void)inode;
 243         return seq_open(file, &fragmentation_op);
 244 }
 245
 246 static const struct file_operations fragmentation_file_operations = {
 247         .open           = fragmentation_open,
 248         .read           = seq_read,
 249         .llseek         = seq_lseek,
 250         .release        = seq_release,
 251 };
 252
 253 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 254 {
 255         return seq_open(file, &pagetypeinfo_op);
 256 }
 257
 258 static const struct file_operations pagetypeinfo_file_ops = {
 259         .open           = pagetypeinfo_open,
 260         .read           = seq_read,
 261         .llseek         = seq_lseek,
 262         .release        = seq_release,
 263 };
 264
 265 static int zoneinfo_open(struct inode *inode, struct file *file)
 266 {
 267         return seq_open(file, &zoneinfo_op);
 268 }
 269
 270 static const struct file_operations proc_zoneinfo_file_operations = {
 271         .open           = zoneinfo_open,
 272         .read           = seq_read,
 273         .llseek         = seq_lseek,
 274         .release        = seq_release,
 275 };
 276
 277 static int version_read_proc(char *page, char **start, off_t off,
 278                                  int count, int *eof, void *data)
 279 {
 280         int len;
 281
 282         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 283                 utsname()->sysname,
 284                 utsname()->release,
 285                 utsname()->version);
 286         return proc_calc_metrics(page, start, off, count, eof, len);
 287 }
 288
 289 extern const struct seq_operations cpuinfo_op;
 290 static int cpuinfo_open(struct inode *inode, struct file *file)
 291 {
 292         return seq_open(file, &cpuinfo_op);
 293 }
 294
 295 static const struct file_operations proc_cpuinfo_operations = {
 296         .open           = cpuinfo_open,
 297         .read           = seq_read,
 298         .llseek         = seq_lseek,
 299         .release        = seq_release,
 300 };
 301
 302 static int devinfo_show(struct seq_file *f, void *v)
 303 {
 304         int i = *(loff_t *) v;
 305
 306         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 307                 if (i == 0)
 308                         seq_printf(f, "Character devices:\n");
 309                 chrdev_show(f, i);
 310         }
 311 #ifdef CONFIG_BLOCK
 312         else {
 313                 i -= CHRDEV_MAJOR_HASH_SIZE;
 314                 if (i == 0)
 315                         seq_printf(f, "\nBlock devices:\n");
 316                 blkdev_show(f, i);
 317         }
 318 #endif
 319         return 0;
 320 }
 321
 322 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 323 {
 324         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 325                 return pos;
 326         return NULL;
 327 }
 328
 329 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 330 {
 331         (*pos)++;
 332         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 333                 return NULL;
 334         return pos;
 335 }
 336
 337 static void devinfo_stop(struct seq_file *f, void *v)
 338 {
 339         /* Nothing to do */
 340 }
 341
 342 static const struct seq_operations devinfo_ops = {
 343         .start = devinfo_start,
 344         .next  = devinfo_next,
 345         .stop  = devinfo_stop,
 346         .show  = devinfo_show
 347 };
 348
 349 static int devinfo_open(struct inode *inode, struct file *filp)
 350 {
 351         return seq_open(filp, &devinfo_ops);
 352 }
 353
 354 static const struct file_operations proc_devinfo_operations = {
 355         .open           = devinfo_open,
 356         .read           = seq_read,
 357         .llseek         = seq_lseek,
 358         .release        = seq_release,
 359 };
 360
 361 static int vmstat_open(struct inode *inode, struct file *file)
 362 {
 363         return seq_open(file, &vmstat_op);
 364 }
 365 static const struct file_operations proc_vmstat_file_operations = {
 366         .open           = vmstat_open,
 367         .read           = seq_read,
 368         .llseek         = seq_lseek,
 369         .release        = seq_release,
 370 };
 371
 372 #ifdef CONFIG_PROC_HARDWARE
 373 static int hardware_read_proc(char *page, char **start, off_t off,
 374                                  int count, int *eof, void *data)
 375 {
 376         int len = get_hardware_list(page);
 377         return proc_calc_metrics(page, start, off, count, eof, len);
 378 }
 379 #endif
 380
 381 #ifdef CONFIG_STRAM_PROC
 382 static int stram_read_proc(char *page, char **start, off_t off,
 383                                  int count, int *eof, void *data)
 384 {
 385         int len = get_stram_list(page);
 386         return proc_calc_metrics(page, start, off, count, eof, len);
 387 }
 388 #endif
 389
 390 #ifdef CONFIG_BLOCK
 391 static int partitions_open(struct inode *inode, struct file *file)
 392 {
 393         return seq_open(file, &partitions_op);
 394 }
 395 static const struct file_operations proc_partitions_operations = {
 396         .open           = partitions_open,
 397         .read           = seq_read,
 398         .llseek         = seq_lseek,
 399         .release        = seq_release,
 400 };
 401
 402 static int diskstats_open(struct inode *inode, struct file *file)
 403 {
 404         return seq_open(file, &diskstats_op);
 405 }
 406 static const struct file_operations proc_diskstats_operations = {
 407         .open           = diskstats_open,
 408         .read           = seq_read,
 409         .llseek         = seq_lseek,
 410         .release        = seq_release,
 411 };
 412 #endif
 413
 414 #ifdef CONFIG_MODULES
 415 extern const struct seq_operations modules_op;
 416 static int modules_open(struct inode *inode, struct file *file)
 417 {
 418         return seq_open(file, &modules_op);
 419 }
 420 static const struct file_operations proc_modules_operations = {
 421         .open           = modules_open,
 422         .read           = seq_read,
 423         .llseek         = seq_lseek,
 424         .release        = seq_release,
 425 };
 426 #endif
 427
 428 #ifdef CONFIG_SLABINFO
 429 static int slabinfo_open(struct inode *inode, struct file *file)
 430 {
 431         return seq_open(file, &slabinfo_op);
 432 }
 433 static const struct file_operations proc_slabinfo_operations = {
 434         .open           = slabinfo_open,
 435         .read           = seq_read,
 436         .write          = slabinfo_write,
 437         .llseek         = seq_lseek,
 438         .release        = seq_release,
 439 };
 440
 441 #ifdef CONFIG_DEBUG_SLAB_LEAK
 442 extern const struct seq_operations slabstats_op;
 443 static int slabstats_open(struct inode *inode, struct file *file)
 444 {
 445         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 446         int ret = -ENOMEM;
 447         if (n) {
 448                 ret = seq_open(file, &slabstats_op);
 449                 if (!ret) {
 450                         struct seq_file *m = file->private_data;
 451                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 452                         m->private = n;
 453                         n = NULL;
 454                 }
 455                 kfree(n);
 456         }
 457         return ret;
 458 }
 459
 460 static const struct file_operations proc_slabstats_operations = {
 461         .open           = slabstats_open,
 462         .read           = seq_read,
 463         .llseek         = seq_lseek,
 464         .release        = seq_release_private,
 465 };
 466 #endif
 467 #endif
 468
 469 #ifdef CONFIG_MMU
 470 static int vmalloc_open(struct inode *inode, struct file *file)
 471 {
 472         unsigned int *ptr = NULL;
 473         int ret;
 474
 475         if (NUMA_BUILD)
 476                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 477         ret = seq_open(file, &vmalloc_op);
 478         if (!ret) {
 479                 struct seq_file *m = file->private_data;
 480                 m->private = ptr;
 481         } else
 482                 kfree(ptr);
 483         return ret;
 484 }
 485
 486 static const struct file_operations proc_vmalloc_operations = {
 487         .open           = vmalloc_open,
 488         .read           = seq_read,
 489         .llseek         = seq_lseek,
 490         .release        = seq_release_private,
 491 };
 492 #endif
 493
 494 #ifndef arch_irq_stat_cpu
 495 #define arch_irq_stat_cpu(cpu) 0
 496 #endif
 497 #ifndef arch_irq_stat
 498 #define arch_irq_stat() 0
 499 #endif
 500
 501 static int show_stat(struct seq_file *p, void *v)
 502 {
 503         int i;
 504         unsigned long jif;
 505         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 506         cputime64_t guest;
 507         u64 sum = 0;
 508         struct timespec boottime;
 509         unsigned int *per_irq_sum;
 510
 511         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 512         if (!per_irq_sum)
 513                 return -ENOMEM;
 514
 515         user = nice = system = idle = iowait =
 516                 irq = softirq = steal = cputime64_zero;
 517         guest = cputime64_zero;
 518         getboottime(&boottime);
 519         jif = boottime.tv_sec;
 520
 521         for_each_possible_cpu(i) {
 522                 int j;
 523
 524                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 525                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 526                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 527                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 528                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 529                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 530                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 531                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 532                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 533                 for (j = 0; j < NR_IRQS; j++) {
 534                         unsigned int temp = kstat_cpu(i).irqs[j];
 535                         sum += temp;
 536                         per_irq_sum[j] += temp;
 537                 }
 538                 sum += arch_irq_stat_cpu(i);
 539         }
 540         sum += arch_irq_stat();
 541
 542         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 543                 (unsigned long long)cputime64_to_clock_t(user),
 544                 (unsigned long long)cputime64_to_clock_t(nice),
 545                 (unsigned long long)cputime64_to_clock_t(system),
 546                 (unsigned long long)cputime64_to_clock_t(idle),
 547                 (unsigned long long)cputime64_to_clock_t(iowait),
 548                 (unsigned long long)cputime64_to_clock_t(irq),
 549                 (unsigned long long)cputime64_to_clock_t(softirq),
 550                 (unsigned long long)cputime64_to_clock_t(steal),
 551                 (unsigned long long)cputime64_to_clock_t(guest));
 552         for_each_online_cpu(i) {
 553
 554                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 555                 user = kstat_cpu(i).cpustat.user;
 556                 nice = kstat_cpu(i).cpustat.nice;
 557                 system = kstat_cpu(i).cpustat.system;
 558                 idle = kstat_cpu(i).cpustat.idle;
 559                 iowait = kstat_cpu(i).cpustat.iowait;
 560                 irq = kstat_cpu(i).cpustat.irq;
 561                 softirq = kstat_cpu(i).cpustat.softirq;
 562                 steal = kstat_cpu(i).cpustat.steal;
 563                 guest = kstat_cpu(i).cpustat.guest;
 564                 seq_printf(p,
 565                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 566                         i,
 567                         (unsigned long long)cputime64_to_clock_t(user),
 568                         (unsigned long long)cputime64_to_clock_t(nice),
 569                         (unsigned long long)cputime64_to_clock_t(system),
 570                         (unsigned long long)cputime64_to_clock_t(idle),
 571                         (unsigned long long)cputime64_to_clock_t(iowait),
 572                         (unsigned long long)cputime64_to_clock_t(irq),
 573                         (unsigned long long)cputime64_to_clock_t(softirq),
 574                         (unsigned long long)cputime64_to_clock_t(steal),
 575                         (unsigned long long)cputime64_to_clock_t(guest));
 576         }
 577         seq_printf(p, "intr %llu", (unsigned long long)sum);
 578
 579         for (i = 0; i < NR_IRQS; i++)
 580                 seq_printf(p, " %u", per_irq_sum[i]);
 581
 582         seq_printf(p,
 583                 "\nctxt %llu\n"
 584                 "btime %lu\n"
 585                 "processes %lu\n"
 586                 "procs_running %lu\n"
 587                 "procs_blocked %lu\n",
 588                 nr_context_switches(),
 589                 (unsigned long)jif,
 590                 total_forks,
 591                 nr_running(),
 592                 nr_iowait());
 593
 594         kfree(per_irq_sum);
 595         return 0;
 596 }
 597
 598 static int stat_open(struct inode *inode, struct file *file)
 599 {
 600         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 601         char *buf;
 602         struct seq_file *m;
 603         int res;
 604
 605         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 606         if (size > 128 * 1024)
 607                 size = 128 * 1024;
 608         buf = kmalloc(size, GFP_KERNEL);
 609         if (!buf)
 610                 return -ENOMEM;
 611
 612         res = single_open(file, show_stat, NULL);
 613         if (!res) {
 614                 m = file->private_data;
 615                 m->buf = buf;
 616                 m->size = size;
 617         } else
 618                 kfree(buf);
 619         return res;
 620 }
 621 static const struct file_operations proc_stat_operations = {
 622         .open           = stat_open,
 623         .read           = seq_read,
 624         .llseek         = seq_lseek,
 625         .release        = single_release,
 626 };
 627
 628 /*
 629  * /proc/interrupts
 630  */
 631 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 632 {
 633         return (*pos <= NR_IRQS) ? pos : NULL;
 634 }
 635
 636 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 637 {
 638         (*pos)++;
 639         if (*pos > NR_IRQS)
 640                 return NULL;
 641         return pos;
 642 }
 643
 644 static void int_seq_stop(struct seq_file *f, void *v)
 645 {
 646         /* Nothing to do */
 647 }
 648
 649
 650 static const struct seq_operations int_seq_ops = {
 651         .start = int_seq_start,
 652         .next  = int_seq_next,
 653         .stop  = int_seq_stop,
 654         .show  = show_interrupts
 655 };
 656
 657 static int interrupts_open(struct inode *inode, struct file *filp)
 658 {
 659         return seq_open(filp, &int_seq_ops);
 660 }
 661
 662 static const struct file_operations proc_interrupts_operations = {
 663         .open           = interrupts_open,
 664         .read           = seq_read,
 665         .llseek         = seq_lseek,
 666         .release        = seq_release,
 667 };
 668
 669 static int filesystems_read_proc(char *page, char **start, off_t off,
 670                                  int count, int *eof, void *data)
 671 {
 672         int len = get_filesystem_list(page);
 673         return proc_calc_metrics(page, start, off, count, eof, len);
 674 }
 675
 676 static int cmdline_read_proc(char *page, char **start, off_t off,
 677                                  int count, int *eof, void *data)
 678 {
 679         int len;
 680
 681         len = sprintf(page, "%s\n", saved_command_line);
 682         return proc_calc_metrics(page, start, off, count, eof, len);
 683 }
 684
 685 #ifdef CONFIG_FILE_LOCKING
 686 static int locks_open(struct inode *inode, struct file *filp)
 687 {
 688         return seq_open(filp, &locks_seq_operations);
 689 }
 690
 691 static const struct file_operations proc_locks_operations = {
 692         .open           = locks_open,
 693         .read           = seq_read,
 694         .llseek         = seq_lseek,
 695         .release        = seq_release,
 696 };
 697 #endif /* CONFIG_FILE_LOCKING */
 698
 699 static int execdomains_read_proc(char *page, char **start, off_t off,
 700                                  int count, int *eof, void *data)
 701 {
 702         int len = get_exec_domain_list(page);
 703         return proc_calc_metrics(page, start, off, count, eof, len);
 704 }
 705
 706 #ifdef CONFIG_PROC_PAGE_MONITOR
 707 #define KPMSIZE sizeof(u64)
 708 #define KPMMASK (KPMSIZE - 1)
 709 /* /proc/kpagecount - an array exposing page counts
 710  *
 711  * Each entry is a u64 representing the corresponding
 712  * physical page count.
 713  */
 714 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 715                              size_t count, loff_t *ppos)
 716 {
 717         u64 __user *out = (u64 __user *)buf;
 718         struct page *ppage;
 719         unsigned long src = *ppos;
 720         unsigned long pfn;
 721         ssize_t ret = 0;
 722         u64 pcount;
 723
 724         pfn = src / KPMSIZE;
 725         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 726         if (src & KPMMASK || count & KPMMASK)
 727                 return -EINVAL;
 728
 729         while (count > 0) {
 730                 ppage = NULL;
 731                 if (pfn_valid(pfn))
 732                         ppage = pfn_to_page(pfn);
 733                 pfn++;
 734                 if (!ppage)
 735                         pcount = 0;
 736                 else
 737                         pcount = page_mapcount(ppage);
 738
 739                 if (put_user(pcount, out++)) {
 740                         ret = -EFAULT;
 741                         break;
 742                 }
 743
 744                 count -= KPMSIZE;
 745         }
 746
 747         *ppos += (char __user *)out - buf;
 748         if (!ret)
 749                 ret = (char __user *)out - buf;
 750         return ret;
 751 }
 752
 753 static struct file_operations proc_kpagecount_operations = {
 754         .llseek = mem_lseek,
 755         .read = kpagecount_read,
 756 };
 757
 758 /* /proc/kpageflags - an array exposing page flags
 759  *
 760  * Each entry is a u64 representing the corresponding
 761  * physical page flags.
 762  */
 763
 764 /* These macros are used to decouple internal flags from exported ones */
 765
 766 #define KPF_LOCKED     0
 767 #define KPF_ERROR      1
 768 #define KPF_REFERENCED 2
 769 #define KPF_UPTODATE   3
 770 #define KPF_DIRTY      4
 771 #define KPF_LRU        5
 772 #define KPF_ACTIVE     6
 773 #define KPF_SLAB       7
 774 #define KPF_WRITEBACK  8
 775 #define KPF_RECLAIM    9
 776 #define KPF_BUDDY     10
 777
 778 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 779
 780 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 781                              size_t count, loff_t *ppos)
 782 {
 783         u64 __user *out = (u64 __user *)buf;
 784         struct page *ppage;
 785         unsigned long src = *ppos;
 786         unsigned long pfn;
 787         ssize_t ret = 0;
 788         u64 kflags, uflags;
 789
 790         pfn = src / KPMSIZE;
 791         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 792         if (src & KPMMASK || count & KPMMASK)
 793                 return -EINVAL;
 794
 795         while (count > 0) {
 796                 ppage = NULL;
 797                 if (pfn_valid(pfn))
 798                         ppage = pfn_to_page(pfn);
 799                 pfn++;
 800                 if (!ppage)
 801                         kflags = 0;
 802                 else
 803                         kflags = ppage->flags;
 804
 805                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 806                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 807                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 808                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 809                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 810                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 811                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 812                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 813                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 814                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 815                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 816
 817                 if (put_user(uflags, out++)) {
 818                         ret = -EFAULT;
 819                         break;
 820                 }
 821
 822                 count -= KPMSIZE;
 823         }
 824
 825         *ppos += (char __user *)out - buf;
 826         if (!ret)
 827                 ret = (char __user *)out - buf;
 828         return ret;
 829 }
 830
 831 static struct file_operations proc_kpageflags_operations = {
 832         .llseek = mem_lseek,
 833         .read = kpageflags_read,
 834 };
 835 #endif /* CONFIG_PROC_PAGE_MONITOR */
 836
 837 struct proc_dir_entry *proc_root_kcore;
 838
 839 void __init proc_misc_init(void)
 840 {
 841         static struct {
 842                 char *name;
 843                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 844         } *p, simple_ones[] = {
 845                 {"loadavg",     loadavg_read_proc},
 846                 {"uptime",      uptime_read_proc},
 847                 {"meminfo",     meminfo_read_proc},
 848                 {"version",     version_read_proc},
 849 #ifdef CONFIG_PROC_HARDWARE
 850                 {"hardware",    hardware_read_proc},
 851 #endif
 852 #ifdef CONFIG_STRAM_PROC
 853                 {"stram",       stram_read_proc},
 854 #endif
 855                 {"filesystems", filesystems_read_proc},
 856                 {"cmdline",     cmdline_read_proc},
 857                 {"execdomains", execdomains_read_proc},
 858                 {NULL,}
 859         };
 860         for (p = simple_ones; p->name; p++)
 861                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 862
 863         proc_symlink("mounts", NULL, "self/mounts");
 864
 865         /* And now for trickier ones */
 866 #ifdef CONFIG_PRINTK
 867         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 868 #endif
 869 #ifdef CONFIG_FILE_LOCKING
 870         proc_create("locks", 0, NULL, &proc_locks_operations);
 871 #endif
 872         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 873         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 874 #ifdef CONFIG_BLOCK
 875         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 876 #endif
 877         proc_create("stat", 0, NULL, &proc_stat_operations);
 878         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 879 #ifdef CONFIG_SLABINFO
 880         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 881 #ifdef CONFIG_DEBUG_SLAB_LEAK
 882         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 883 #endif
 884 #endif
 885 #ifdef CONFIG_MMU
 886         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 887 #endif
 888         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 889         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 890         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 891         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 892 #ifdef CONFIG_BLOCK
 893         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 894 #endif
 895 #ifdef CONFIG_MODULES
 896         proc_create("modules", 0, NULL, &proc_modules_operations);
 897 #endif
 898 #ifdef CONFIG_SCHEDSTATS
 899         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 900 #endif
 901 #ifdef CONFIG_PROC_KCORE
 902         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 903         if (proc_root_kcore)
 904                 proc_root_kcore->size =
 905                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 906 #endif
 907 #ifdef CONFIG_PROC_PAGE_MONITOR
 908         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 909         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 910 #endif
 911 #ifdef CONFIG_PROC_VMCORE
 912         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 913 #endif
 914 }