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