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