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 #ifdef CONFIG_MMU
 460 static int vmalloc_open(struct inode *inode, struct file *file)
 461 {
 462         return seq_open(file, &vmalloc_op);
 463 }
 464
 465 static const struct file_operations proc_vmalloc_operations = {
 466         .open           = vmalloc_open,
 467         .read           = seq_read,
 468         .llseek         = seq_lseek,
 469         .release        = seq_release,
 470 };
 471 #endif
 472
 473 static int show_stat(struct seq_file *p, void *v)
 474 {
 475         int i;
 476         unsigned long jif;
 477         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 478         cputime64_t guest;
 479         u64 sum = 0;
 480         struct timespec boottime;
 481         unsigned int *per_irq_sum;
 482
 483         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 484         if (!per_irq_sum)
 485                 return -ENOMEM;
 486
 487         user = nice = system = idle = iowait =
 488                 irq = softirq = steal = cputime64_zero;
 489         guest = cputime64_zero;
 490         getboottime(&boottime);
 491         jif = boottime.tv_sec;
 492
 493         for_each_possible_cpu(i) {
 494                 int j;
 495
 496                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 497                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 498                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 499                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 500                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 501                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 502                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 503                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 504                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 505                 for (j = 0; j < NR_IRQS; j++) {
 506                         unsigned int temp = kstat_cpu(i).irqs[j];
 507                         sum += temp;
 508                         per_irq_sum[j] += temp;
 509                 }
 510         }
 511
 512         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 513                 (unsigned long long)cputime64_to_clock_t(user),
 514                 (unsigned long long)cputime64_to_clock_t(nice),
 515                 (unsigned long long)cputime64_to_clock_t(system),
 516                 (unsigned long long)cputime64_to_clock_t(idle),
 517                 (unsigned long long)cputime64_to_clock_t(iowait),
 518                 (unsigned long long)cputime64_to_clock_t(irq),
 519                 (unsigned long long)cputime64_to_clock_t(softirq),
 520                 (unsigned long long)cputime64_to_clock_t(steal),
 521                 (unsigned long long)cputime64_to_clock_t(guest));
 522         for_each_online_cpu(i) {
 523
 524                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 525                 user = kstat_cpu(i).cpustat.user;
 526                 nice = kstat_cpu(i).cpustat.nice;
 527                 system = kstat_cpu(i).cpustat.system;
 528                 idle = kstat_cpu(i).cpustat.idle;
 529                 iowait = kstat_cpu(i).cpustat.iowait;
 530                 irq = kstat_cpu(i).cpustat.irq;
 531                 softirq = kstat_cpu(i).cpustat.softirq;
 532                 steal = kstat_cpu(i).cpustat.steal;
 533                 guest = kstat_cpu(i).cpustat.guest;
 534                 seq_printf(p,
 535                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 536                         i,
 537                         (unsigned long long)cputime64_to_clock_t(user),
 538                         (unsigned long long)cputime64_to_clock_t(nice),
 539                         (unsigned long long)cputime64_to_clock_t(system),
 540                         (unsigned long long)cputime64_to_clock_t(idle),
 541                         (unsigned long long)cputime64_to_clock_t(iowait),
 542                         (unsigned long long)cputime64_to_clock_t(irq),
 543                         (unsigned long long)cputime64_to_clock_t(softirq),
 544                         (unsigned long long)cputime64_to_clock_t(steal),
 545                         (unsigned long long)cputime64_to_clock_t(guest));
 546         }
 547         seq_printf(p, "intr %llu", (unsigned long long)sum);
 548
 549         for (i = 0; i < NR_IRQS; i++)
 550                 seq_printf(p, " %u", per_irq_sum[i]);
 551
 552         seq_printf(p,
 553                 "\nctxt %llu\n"
 554                 "btime %lu\n"
 555                 "processes %lu\n"
 556                 "procs_running %lu\n"
 557                 "procs_blocked %lu\n",
 558                 nr_context_switches(),
 559                 (unsigned long)jif,
 560                 total_forks,
 561                 nr_running(),
 562                 nr_iowait());
 563
 564         kfree(per_irq_sum);
 565         return 0;
 566 }
 567
 568 static int stat_open(struct inode *inode, struct file *file)
 569 {
 570         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 571         char *buf;
 572         struct seq_file *m;
 573         int res;
 574
 575         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 576         if (size > 128 * 1024)
 577                 size = 128 * 1024;
 578         buf = kmalloc(size, GFP_KERNEL);
 579         if (!buf)
 580                 return -ENOMEM;
 581
 582         res = single_open(file, show_stat, NULL);
 583         if (!res) {
 584                 m = file->private_data;
 585                 m->buf = buf;
 586                 m->size = size;
 587         } else
 588                 kfree(buf);
 589         return res;
 590 }
 591 static const struct file_operations proc_stat_operations = {
 592         .open           = stat_open,
 593         .read           = seq_read,
 594         .llseek         = seq_lseek,
 595         .release        = single_release,
 596 };
 597
 598 /*
 599  * /proc/interrupts
 600  */
 601 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 602 {
 603         return (*pos <= NR_IRQS) ? pos : NULL;
 604 }
 605
 606 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 607 {
 608         (*pos)++;
 609         if (*pos > NR_IRQS)
 610                 return NULL;
 611         return pos;
 612 }
 613
 614 static void int_seq_stop(struct seq_file *f, void *v)
 615 {
 616         /* Nothing to do */
 617 }
 618
 619
 620 static const struct seq_operations int_seq_ops = {
 621         .start = int_seq_start,
 622         .next  = int_seq_next,
 623         .stop  = int_seq_stop,
 624         .show  = show_interrupts
 625 };
 626
 627 static int interrupts_open(struct inode *inode, struct file *filp)
 628 {
 629         return seq_open(filp, &int_seq_ops);
 630 }
 631
 632 static const struct file_operations proc_interrupts_operations = {
 633         .open           = interrupts_open,
 634         .read           = seq_read,
 635         .llseek         = seq_lseek,
 636         .release        = seq_release,
 637 };
 638
 639 static int filesystems_read_proc(char *page, char **start, off_t off,
 640                                  int count, int *eof, void *data)
 641 {
 642         int len = get_filesystem_list(page);
 643         return proc_calc_metrics(page, start, off, count, eof, len);
 644 }
 645
 646 static int cmdline_read_proc(char *page, char **start, off_t off,
 647                                  int count, int *eof, void *data)
 648 {
 649         int len;
 650
 651         len = sprintf(page, "%s\n", saved_command_line);
 652         return proc_calc_metrics(page, start, off, count, eof, len);
 653 }
 654
 655 static int locks_open(struct inode *inode, struct file *filp)
 656 {
 657         return seq_open(filp, &locks_seq_operations);
 658 }
 659
 660 static const struct file_operations proc_locks_operations = {
 661         .open           = locks_open,
 662         .read           = seq_read,
 663         .llseek         = seq_lseek,
 664         .release        = seq_release,
 665 };
 666
 667 static int execdomains_read_proc(char *page, char **start, off_t off,
 668                                  int count, int *eof, void *data)
 669 {
 670         int len = get_exec_domain_list(page);
 671         return proc_calc_metrics(page, start, off, count, eof, len);
 672 }
 673
 674 #ifdef CONFIG_MAGIC_SYSRQ
 675 /*
 676  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 677  */
 678 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 679                                    size_t count, loff_t *ppos)
 680 {
 681         if (count) {
 682                 char c;
 683
 684                 if (get_user(c, buf))
 685                         return -EFAULT;
 686                 __handle_sysrq(c, NULL, 0);
 687         }
 688         return count;
 689 }
 690
 691 static const struct file_operations proc_sysrq_trigger_operations = {
 692         .write          = write_sysrq_trigger,
 693 };
 694 #endif
 695
 696 #ifdef CONFIG_PROC_PAGE_MONITOR
 697 #define KPMSIZE sizeof(u64)
 698 #define KPMMASK (KPMSIZE - 1)
 699 /* /proc/kpagecount - an array exposing page counts
 700  *
 701  * Each entry is a u64 representing the corresponding
 702  * physical page count.
 703  */
 704 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 705                              size_t count, loff_t *ppos)
 706 {
 707         u64 __user *out = (u64 __user *)buf;
 708         struct page *ppage;
 709         unsigned long src = *ppos;
 710         unsigned long pfn;
 711         ssize_t ret = 0;
 712         u64 pcount;
 713
 714         pfn = src / KPMSIZE;
 715         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 716         if (src & KPMMASK || count & KPMMASK)
 717                 return -EIO;
 718
 719         while (count > 0) {
 720                 ppage = NULL;
 721                 if (pfn_valid(pfn))
 722                         ppage = pfn_to_page(pfn);
 723                 pfn++;
 724                 if (!ppage)
 725                         pcount = 0;
 726                 else
 727                         pcount = atomic_read(&ppage->_count);
 728
 729                 if (put_user(pcount, out++)) {
 730                         ret = -EFAULT;
 731                         break;
 732                 }
 733
 734                 count -= KPMSIZE;
 735         }
 736
 737         *ppos += (char __user *)out - buf;
 738         if (!ret)
 739                 ret = (char __user *)out - buf;
 740         return ret;
 741 }
 742
 743 static struct file_operations proc_kpagecount_operations = {
 744         .llseek = mem_lseek,
 745         .read = kpagecount_read,
 746 };
 747
 748 /* /proc/kpageflags - an array exposing page flags
 749  *
 750  * Each entry is a u64 representing the corresponding
 751  * physical page flags.
 752  */
 753
 754 /* These macros are used to decouple internal flags from exported ones */
 755
 756 #define KPF_LOCKED     0
 757 #define KPF_ERROR      1
 758 #define KPF_REFERENCED 2
 759 #define KPF_UPTODATE   3
 760 #define KPF_DIRTY      4
 761 #define KPF_LRU        5
 762 #define KPF_ACTIVE     6
 763 #define KPF_SLAB       7
 764 #define KPF_WRITEBACK  8
 765 #define KPF_RECLAIM    9
 766 #define KPF_BUDDY     10
 767
 768 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 769
 770 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 771                              size_t count, loff_t *ppos)
 772 {
 773         u64 __user *out = (u64 __user *)buf;
 774         struct page *ppage;
 775         unsigned long src = *ppos;
 776         unsigned long pfn;
 777         ssize_t ret = 0;
 778         u64 kflags, uflags;
 779
 780         pfn = src / KPMSIZE;
 781         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 782         if (src & KPMMASK || count & KPMMASK)
 783                 return -EIO;
 784
 785         while (count > 0) {
 786                 ppage = NULL;
 787                 if (pfn_valid(pfn))
 788                         ppage = pfn_to_page(pfn);
 789                 pfn++;
 790                 if (!ppage)
 791                         kflags = 0;
 792                 else
 793                         kflags = ppage->flags;
 794
 795                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 796                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 797                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 798                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 799                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 800                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 801                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 802                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 803                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 804                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 805                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 806
 807                 if (put_user(uflags, out++)) {
 808                         ret = -EFAULT;
 809                         break;
 810                 }
 811
 812                 count -= KPMSIZE;
 813         }
 814
 815         *ppos += (char __user *)out - buf;
 816         if (!ret)
 817                 ret = (char __user *)out - buf;
 818         return ret;
 819 }
 820
 821 static struct file_operations proc_kpageflags_operations = {
 822         .llseek = mem_lseek,
 823         .read = kpageflags_read,
 824 };
 825 #endif /* CONFIG_PROC_PAGE_MONITOR */
 826
 827 struct proc_dir_entry *proc_root_kcore;
 828
 829 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 830 {
 831         struct proc_dir_entry *entry;
 832         entry = create_proc_entry(name, mode, NULL);
 833         if (entry)
 834                 entry->proc_fops = f;
 835 }
 836
 837 void __init proc_misc_init(void)
 838 {
 839         static struct {
 840                 char *name;
 841                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 842         } *p, simple_ones[] = {
 843                 {"loadavg",     loadavg_read_proc},
 844                 {"uptime",      uptime_read_proc},
 845                 {"meminfo",     meminfo_read_proc},
 846                 {"version",     version_read_proc},
 847 #ifdef CONFIG_PROC_HARDWARE
 848                 {"hardware",    hardware_read_proc},
 849 #endif
 850 #ifdef CONFIG_STRAM_PROC
 851                 {"stram",       stram_read_proc},
 852 #endif
 853                 {"filesystems", filesystems_read_proc},
 854                 {"cmdline",     cmdline_read_proc},
 855                 {"execdomains", execdomains_read_proc},
 856                 {NULL,}
 857         };
 858         for (p = simple_ones; p->name; p++)
 859                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 860
 861         proc_symlink("mounts", NULL, "self/mounts");
 862
 863         /* And now for trickier ones */
 864 #ifdef CONFIG_PRINTK
 865         {
 866                 struct proc_dir_entry *entry;
 867                 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 868                 if (entry)
 869                         entry->proc_fops = &proc_kmsg_operations;
 870         }
 871 #endif
 872         create_seq_entry("locks", 0, &proc_locks_operations);
 873         create_seq_entry("devices", 0, &proc_devinfo_operations);
 874         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 875 #ifdef CONFIG_BLOCK
 876         create_seq_entry("partitions", 0, &proc_partitions_operations);
 877 #endif
 878         create_seq_entry("stat", 0, &proc_stat_operations);
 879         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 880 #ifdef CONFIG_SLABINFO
 881         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 882 #ifdef CONFIG_DEBUG_SLAB_LEAK
 883         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 884 #endif
 885 #endif
 886 #ifdef CONFIG_MMU
 887         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 888 #endif
 889         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 890         create_seq_entry("pagetypeinfo", S_IRUGO, &pagetypeinfo_file_ops);
 891         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 892         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
 893 #ifdef CONFIG_BLOCK
 894         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 895 #endif
 896 #ifdef CONFIG_MODULES
 897         create_seq_entry("modules", 0, &proc_modules_operations);
 898 #endif
 899 #ifdef CONFIG_SCHEDSTATS
 900         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 901 #endif
 902 #ifdef CONFIG_PROC_KCORE
 903         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 904         if (proc_root_kcore) {
 905                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 906                 proc_root_kcore->size =
 907                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 908         }
 909 #endif
 910 #ifdef CONFIG_PROC_PAGE_MONITOR
 911         create_seq_entry("kpagecount", S_IRUSR, &proc_kpagecount_operations);
 912         create_seq_entry("kpageflags", S_IRUSR, &proc_kpageflags_operations);
 913 #endif
 914 #ifdef CONFIG_PROC_VMCORE
 915         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
 916         if (proc_vmcore)
 917                 proc_vmcore->proc_fops = &proc_vmcore_operations;
 918 #endif
 919 #ifdef CONFIG_MAGIC_SYSRQ
 920         {
 921                 struct proc_dir_entry *entry;
 922                 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 923                 if (entry)
 924                         entry->proc_fops = &proc_sysrq_trigger_operations;
 925         }
 926 #endif
 927 }