fs/proc/proc_misc.c

   1 /*
   2  *  linux/fs/proc/proc_misc.c
   3  *
   4  *  linux/fs/proc/array.c
   5  *  Copyright (C) 1992  by Linus Torvalds
   6  *  based on ideas by Darren Senn
   7  *
   8  *  This used to be the part of array.c. See the rest of history and credits
   9  *  there. I took this into a separate file and switched the thing to generic
  10  *  proc_file_inode_operations, leaving in array.c only per-process stuff.
  11  *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
  12  *
  13  * Changes:
  14  * Fulton Green      :  Encapsulated position metric calculations.
  15  *                      <kernel@FultonGreen.com>
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/time.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/fs.h>
  24 #include <linux/tty.h>
  25 #include <linux/string.h>
  26 #include <linux/mman.h>
  27 #include <linux/quicklist.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/ioport.h>
  30 #include <linux/mm.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/irq.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/swap.h>
  36 #include <linux/slab.h>
  37 #include <linux/genhd.h>
  38 #include <linux/smp.h>
  39 #include <linux/signal.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/times.h>
  44 #include <linux/profile.h>
  45 #include <linux/utsname.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/hugetlb.h>
  48 #include <linux/jiffies.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/crash_dump.h>
  51 #include <linux/pid_namespace.h>
  52 #include <linux/bootmem.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/pgtable.h>
  55 #include <asm/io.h>
  56 #include <asm/tlb.h>
  57 #include <asm/div64.h>
  58 #include "internal.h"
  59
  60 /*
  61  * Warning: stuff below (imported functions) assumes that its output will fit
  62  * into one page. For some of those functions it may be wrong. Moreover, we
  63  * have a way to deal with that gracefully. Right now I used straightforward
  64  * wrappers, but this needs further analysis wrt potential overflows.
  65  */
  66 extern int get_hardware_list(char *);
  67 extern int get_stram_list(char *);
  68 extern int get_exec_domain_list(char *);
  69
  70 static int proc_calc_metrics(char *page, char **start, off_t off,
  71                                  int count, int *eof, int len)
  72 {
  73         if (len <= off+count) *eof = 1;
  74         *start = page + off;
  75         len -= off;
  76         if (len>count) len = count;
  77         if (len<0) len = 0;
  78         return len;
  79 }
  80
  81 int __attribute__((weak)) arch_report_meminfo(char *page)
  82 {
  83         return 0;
  84 }
  85
  86 static int meminfo_read_proc(char *page, char **start, off_t off,
  87                                  int count, int *eof, void *data)
  88 {
  89         struct sysinfo i;
  90         int len;
  91         unsigned long committed;
  92         unsigned long allowed;
  93         struct vmalloc_info vmi;
  94         long cached;
  95         unsigned long pages[NR_LRU_LISTS];
  96         int lru;
  97
  98 /*
  99  * display in kilobytes.
 100  */
 101 #define K(x) ((x) << (PAGE_SHIFT - 10))
 102         si_meminfo(&i);
 103         si_swapinfo(&i);
 104         committed = atomic_long_read(&vm_committed_space);
 105         allowed = ((totalram_pages - hugetlb_total_pages())
 106                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 107
 108         cached = global_page_state(NR_FILE_PAGES) -
 109                         total_swapcache_pages - i.bufferram;
 110         if (cached < 0)
 111                 cached = 0;
 112
 113         get_vmalloc_info(&vmi);
 114
 115         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
 116                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
 117
 118         /*
 119          * Tagged format, for easy grepping and expansion.
 120          */
 121         len = sprintf(page,
 122                 "MemTotal:       %8lu kB\n"
 123                 "MemFree:        %8lu kB\n"
 124                 "Buffers:        %8lu kB\n"
 125                 "Cached:         %8lu kB\n"
 126                 "SwapCached:     %8lu kB\n"
 127                 "Active:         %8lu kB\n"
 128                 "Inactive:       %8lu kB\n"
 129                 "Active(anon):   %8lu kB\n"
 130                 "Inactive(anon): %8lu kB\n"
 131                 "Active(file):   %8lu kB\n"
 132                 "Inactive(file): %8lu kB\n"
 133 #ifdef CONFIG_UNEVICTABLE_LRU
 134                 "Unevictable:    %8lu kB\n"
 135                 "Mlocked:        %8lu kB\n"
 136 #endif
 137 #ifdef CONFIG_HIGHMEM
 138                 "HighTotal:      %8lu kB\n"
 139                 "HighFree:       %8lu kB\n"
 140                 "LowTotal:       %8lu kB\n"
 141                 "LowFree:        %8lu kB\n"
 142 #endif
 143                 "SwapTotal:      %8lu kB\n"
 144                 "SwapFree:       %8lu kB\n"
 145                 "Dirty:          %8lu kB\n"
 146                 "Writeback:      %8lu kB\n"
 147                 "AnonPages:      %8lu kB\n"
 148                 "Mapped:         %8lu kB\n"
 149                 "Slab:           %8lu kB\n"
 150                 "SReclaimable:   %8lu kB\n"
 151                 "SUnreclaim:     %8lu kB\n"
 152                 "PageTables:     %8lu kB\n"
 153 #ifdef CONFIG_QUICKLIST
 154                 "Quicklists:     %8lu kB\n"
 155 #endif
 156                 "NFS_Unstable:   %8lu kB\n"
 157                 "Bounce:         %8lu kB\n"
 158                 "WritebackTmp:   %8lu kB\n"
 159                 "CommitLimit:    %8lu kB\n"
 160                 "Committed_AS:   %8lu kB\n"
 161                 "VmallocTotal:   %8lu kB\n"
 162                 "VmallocUsed:    %8lu kB\n"
 163                 "VmallocChunk:   %8lu kB\n",
 164                 K(i.totalram),
 165                 K(i.freeram),
 166                 K(i.bufferram),
 167                 K(cached),
 168                 K(total_swapcache_pages),
 169                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 170                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 171                 K(pages[LRU_ACTIVE_ANON]),
 172                 K(pages[LRU_INACTIVE_ANON]),
 173                 K(pages[LRU_ACTIVE_FILE]),
 174                 K(pages[LRU_INACTIVE_FILE]),
 175 #ifdef CONFIG_UNEVICTABLE_LRU
 176                 K(pages[LRU_UNEVICTABLE]),
 177                 K(global_page_state(NR_MLOCK)),
 178 #endif
 179 #ifdef CONFIG_HIGHMEM
 180                 K(i.totalhigh),
 181                 K(i.freehigh),
 182                 K(i.totalram-i.totalhigh),
 183                 K(i.freeram-i.freehigh),
 184 #endif
 185                 K(i.totalswap),
 186                 K(i.freeswap),
 187                 K(global_page_state(NR_FILE_DIRTY)),
 188                 K(global_page_state(NR_WRITEBACK)),
 189                 K(global_page_state(NR_ANON_PAGES)),
 190                 K(global_page_state(NR_FILE_MAPPED)),
 191                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 192                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 193                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 194                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 195                 K(global_page_state(NR_PAGETABLE)),
 196 #ifdef CONFIG_QUICKLIST
 197                 K(quicklist_total_size()),
 198 #endif
 199                 K(global_page_state(NR_UNSTABLE_NFS)),
 200                 K(global_page_state(NR_BOUNCE)),
 201                 K(global_page_state(NR_WRITEBACK_TEMP)),
 202                 K(allowed),
 203                 K(committed),
 204                 (unsigned long)VMALLOC_TOTAL >> 10,
 205                 vmi.used >> 10,
 206                 vmi.largest_chunk >> 10
 207                 );
 208
 209                 len += hugetlb_report_meminfo(page + len);
 210
 211         len += arch_report_meminfo(page + len);
 212
 213         return proc_calc_metrics(page, start, off, count, eof, len);
 214 #undef K
 215 }
 216
 217 static int fragmentation_open(struct inode *inode, struct file *file)
 218 {
 219         (void)inode;
 220         return seq_open(file, &fragmentation_op);
 221 }
 222
 223 static const struct file_operations fragmentation_file_operations = {
 224         .open           = fragmentation_open,
 225         .read           = seq_read,
 226         .llseek         = seq_lseek,
 227         .release        = seq_release,
 228 };
 229
 230 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 231 {
 232         return seq_open(file, &pagetypeinfo_op);
 233 }
 234
 235 static const struct file_operations pagetypeinfo_file_ops = {
 236         .open           = pagetypeinfo_open,
 237         .read           = seq_read,
 238         .llseek         = seq_lseek,
 239         .release        = seq_release,
 240 };
 241
 242 static int zoneinfo_open(struct inode *inode, struct file *file)
 243 {
 244         return seq_open(file, &zoneinfo_op);
 245 }
 246
 247 static const struct file_operations proc_zoneinfo_file_operations = {
 248         .open           = zoneinfo_open,
 249         .read           = seq_read,
 250         .llseek         = seq_lseek,
 251         .release        = seq_release,
 252 };
 253
 254 static int version_read_proc(char *page, char **start, off_t off,
 255                                  int count, int *eof, void *data)
 256 {
 257         int len;
 258
 259         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 260                 utsname()->sysname,
 261                 utsname()->release,
 262                 utsname()->version);
 263         return proc_calc_metrics(page, start, off, count, eof, len);
 264 }
 265
 266 extern const struct seq_operations cpuinfo_op;
 267 static int cpuinfo_open(struct inode *inode, struct file *file)
 268 {
 269         return seq_open(file, &cpuinfo_op);
 270 }
 271
 272 static const struct file_operations proc_cpuinfo_operations = {
 273         .open           = cpuinfo_open,
 274         .read           = seq_read,
 275         .llseek         = seq_lseek,
 276         .release        = seq_release,
 277 };
 278
 279 static int devinfo_show(struct seq_file *f, void *v)
 280 {
 281         int i = *(loff_t *) v;
 282
 283         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 284                 if (i == 0)
 285                         seq_printf(f, "Character devices:\n");
 286                 chrdev_show(f, i);
 287         }
 288 #ifdef CONFIG_BLOCK
 289         else {
 290                 i -= CHRDEV_MAJOR_HASH_SIZE;
 291                 if (i == 0)
 292                         seq_printf(f, "\nBlock devices:\n");
 293                 blkdev_show(f, i);
 294         }
 295 #endif
 296         return 0;
 297 }
 298
 299 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 300 {
 301         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 302                 return pos;
 303         return NULL;
 304 }
 305
 306 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 307 {
 308         (*pos)++;
 309         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 310                 return NULL;
 311         return pos;
 312 }
 313
 314 static void devinfo_stop(struct seq_file *f, void *v)
 315 {
 316         /* Nothing to do */
 317 }
 318
 319 static const struct seq_operations devinfo_ops = {
 320         .start = devinfo_start,
 321         .next  = devinfo_next,
 322         .stop  = devinfo_stop,
 323         .show  = devinfo_show
 324 };
 325
 326 static int devinfo_open(struct inode *inode, struct file *filp)
 327 {
 328         return seq_open(filp, &devinfo_ops);
 329 }
 330
 331 static const struct file_operations proc_devinfo_operations = {
 332         .open           = devinfo_open,
 333         .read           = seq_read,
 334         .llseek         = seq_lseek,
 335         .release        = seq_release,
 336 };
 337
 338 static int vmstat_open(struct inode *inode, struct file *file)
 339 {
 340         return seq_open(file, &vmstat_op);
 341 }
 342 static const struct file_operations proc_vmstat_file_operations = {
 343         .open           = vmstat_open,
 344         .read           = seq_read,
 345         .llseek         = seq_lseek,
 346         .release        = seq_release,
 347 };
 348
 349 #ifdef CONFIG_PROC_HARDWARE
 350 static int hardware_read_proc(char *page, char **start, off_t off,
 351                                  int count, int *eof, void *data)
 352 {
 353         int len = get_hardware_list(page);
 354         return proc_calc_metrics(page, start, off, count, eof, len);
 355 }
 356 #endif
 357
 358 #ifdef CONFIG_STRAM_PROC
 359 static int stram_read_proc(char *page, char **start, off_t off,
 360                                  int count, int *eof, void *data)
 361 {
 362         int len = get_stram_list(page);
 363         return proc_calc_metrics(page, start, off, count, eof, len);
 364 }
 365 #endif
 366
 367 #ifdef CONFIG_BLOCK
 368 static int partitions_open(struct inode *inode, struct file *file)
 369 {
 370         return seq_open(file, &partitions_op);
 371 }
 372 static const struct file_operations proc_partitions_operations = {
 373         .open           = partitions_open,
 374         .read           = seq_read,
 375         .llseek         = seq_lseek,
 376         .release        = seq_release,
 377 };
 378
 379 static int diskstats_open(struct inode *inode, struct file *file)
 380 {
 381         return seq_open(file, &diskstats_op);
 382 }
 383 static const struct file_operations proc_diskstats_operations = {
 384         .open           = diskstats_open,
 385         .read           = seq_read,
 386         .llseek         = seq_lseek,
 387         .release        = seq_release,
 388 };
 389 #endif
 390
 391 #ifdef CONFIG_MODULES
 392 extern const struct seq_operations modules_op;
 393 static int modules_open(struct inode *inode, struct file *file)
 394 {
 395         return seq_open(file, &modules_op);
 396 }
 397 static const struct file_operations proc_modules_operations = {
 398         .open           = modules_open,
 399         .read           = seq_read,
 400         .llseek         = seq_lseek,
 401         .release        = seq_release,
 402 };
 403 #endif
 404
 405 #ifdef CONFIG_SLABINFO
 406 static int slabinfo_open(struct inode *inode, struct file *file)
 407 {
 408         return seq_open(file, &slabinfo_op);
 409 }
 410 static const struct file_operations proc_slabinfo_operations = {
 411         .open           = slabinfo_open,
 412         .read           = seq_read,
 413         .write          = slabinfo_write,
 414         .llseek         = seq_lseek,
 415         .release        = seq_release,
 416 };
 417
 418 #ifdef CONFIG_DEBUG_SLAB_LEAK
 419 extern const struct seq_operations slabstats_op;
 420 static int slabstats_open(struct inode *inode, struct file *file)
 421 {
 422         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 423         int ret = -ENOMEM;
 424         if (n) {
 425                 ret = seq_open(file, &slabstats_op);
 426                 if (!ret) {
 427                         struct seq_file *m = file->private_data;
 428                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 429                         m->private = n;
 430                         n = NULL;
 431                 }
 432                 kfree(n);
 433         }
 434         return ret;
 435 }
 436
 437 static const struct file_operations proc_slabstats_operations = {
 438         .open           = slabstats_open,
 439         .read           = seq_read,
 440         .llseek         = seq_lseek,
 441         .release        = seq_release_private,
 442 };
 443 #endif
 444 #endif
 445
 446 #ifdef CONFIG_MMU
 447 static int vmalloc_open(struct inode *inode, struct file *file)
 448 {
 449         unsigned int *ptr = NULL;
 450         int ret;
 451
 452         if (NUMA_BUILD)
 453                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 454         ret = seq_open(file, &vmalloc_op);
 455         if (!ret) {
 456                 struct seq_file *m = file->private_data;
 457                 m->private = ptr;
 458         } else
 459                 kfree(ptr);
 460         return ret;
 461 }
 462
 463 static const struct file_operations proc_vmalloc_operations = {
 464         .open           = vmalloc_open,
 465         .read           = seq_read,
 466         .llseek         = seq_lseek,
 467         .release        = seq_release_private,
 468 };
 469 #endif
 470
 471 #ifndef arch_irq_stat_cpu
 472 #define arch_irq_stat_cpu(cpu) 0
 473 #endif
 474 #ifndef arch_irq_stat
 475 #define arch_irq_stat() 0
 476 #endif
 477
 478 static int show_stat(struct seq_file *p, void *v)
 479 {
 480         int i, j;
 481         unsigned long jif;
 482         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 483         cputime64_t guest;
 484         u64 sum = 0;
 485         struct timespec boottime;
 486         unsigned int per_irq_sum;
 487
 488         user = nice = system = idle = iowait =
 489                 irq = softirq = steal = cputime64_zero;
 490         guest = cputime64_zero;
 491         getboottime(&boottime);
 492         jif = boottime.tv_sec;
 493
 494         for_each_possible_cpu(i) {
 495                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 496                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 497                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 498                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 499                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 500                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 501                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 502                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 503                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 504
 505                 for_each_irq_nr(j)
 506                         sum += kstat_irqs_cpu(j, i);
 507
 508                 sum += arch_irq_stat_cpu(i);
 509         }
 510         sum += arch_irq_stat();
 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         /* sum again ? it could be updated? */
 550         for_each_irq_nr(j) {
 551                 per_irq_sum = 0;
 552
 553                 for_each_possible_cpu(i)
 554                         per_irq_sum += kstat_irqs_cpu(j, i);
 555
 556                 seq_printf(p, " %u", per_irq_sum);
 557         }
 558
 559         seq_printf(p,
 560                 "\nctxt %llu\n"
 561                 "btime %lu\n"
 562                 "processes %lu\n"
 563                 "procs_running %lu\n"
 564                 "procs_blocked %lu\n",
 565                 nr_context_switches(),
 566                 (unsigned long)jif,
 567                 total_forks,
 568                 nr_running(),
 569                 nr_iowait());
 570
 571         return 0;
 572 }
 573
 574 static int stat_open(struct inode *inode, struct file *file)
 575 {
 576         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 577         char *buf;
 578         struct seq_file *m;
 579         int res;
 580
 581         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 582         if (size > 128 * 1024)
 583                 size = 128 * 1024;
 584         buf = kmalloc(size, GFP_KERNEL);
 585         if (!buf)
 586                 return -ENOMEM;
 587
 588         res = single_open(file, show_stat, NULL);
 589         if (!res) {
 590                 m = file->private_data;
 591                 m->buf = buf;
 592                 m->size = size;
 593         } else
 594                 kfree(buf);
 595         return res;
 596 }
 597 static const struct file_operations proc_stat_operations = {
 598         .open           = stat_open,
 599         .read           = seq_read,
 600         .llseek         = seq_lseek,
 601         .release        = single_release,
 602 };
 603
 604 /*
 605  * /proc/interrupts
 606  */
 607 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 608 {
 609         return (*pos <= nr_irqs) ? pos : NULL;
 610 }
 611
 612
 613 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 614 {
 615         (*pos)++;
 616         return (*pos <= nr_irqs) ? pos : NULL;
 617 }
 618
 619 static void int_seq_stop(struct seq_file *f, void *v)
 620 {
 621         /* Nothing to do */
 622 }
 623
 624 static const struct seq_operations int_seq_ops = {
 625         .start = int_seq_start,
 626         .next  = int_seq_next,
 627         .stop  = int_seq_stop,
 628         .show  = show_interrupts
 629 };
 630
 631 static int interrupts_open(struct inode *inode, struct file *filp)
 632 {
 633         return seq_open(filp, &int_seq_ops);
 634 }
 635
 636 static const struct file_operations proc_interrupts_operations = {
 637         .open           = interrupts_open,
 638         .read           = seq_read,
 639         .llseek         = seq_lseek,
 640         .release        = seq_release,
 641 };
 642
 643 static int filesystems_read_proc(char *page, char **start, off_t off,
 644                                  int count, int *eof, void *data)
 645 {
 646         int len = get_filesystem_list(page);
 647         return proc_calc_metrics(page, start, off, count, eof, len);
 648 }
 649
 650 static int cmdline_read_proc(char *page, char **start, off_t off,
 651                                  int count, int *eof, void *data)
 652 {
 653         int len;
 654
 655         len = sprintf(page, "%s\n", saved_command_line);
 656         return proc_calc_metrics(page, start, off, count, eof, len);
 657 }
 658
 659 #ifdef CONFIG_FILE_LOCKING
 660 static int locks_open(struct inode *inode, struct file *filp)
 661 {
 662         return seq_open(filp, &locks_seq_operations);
 663 }
 664
 665 static const struct file_operations proc_locks_operations = {
 666         .open           = locks_open,
 667         .read           = seq_read,
 668         .llseek         = seq_lseek,
 669         .release        = seq_release,
 670 };
 671 #endif /* CONFIG_FILE_LOCKING */
 672
 673 static int execdomains_read_proc(char *page, char **start, off_t off,
 674                                  int count, int *eof, void *data)
 675 {
 676         int len = get_exec_domain_list(page);
 677         return proc_calc_metrics(page, start, off, count, eof, len);
 678 }
 679
 680 #ifdef CONFIG_PROC_PAGE_MONITOR
 681 #define KPMSIZE sizeof(u64)
 682 #define KPMMASK (KPMSIZE - 1)
 683 /* /proc/kpagecount - an array exposing page counts
 684  *
 685  * Each entry is a u64 representing the corresponding
 686  * physical page count.
 687  */
 688 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 689                              size_t count, loff_t *ppos)
 690 {
 691         u64 __user *out = (u64 __user *)buf;
 692         struct page *ppage;
 693         unsigned long src = *ppos;
 694         unsigned long pfn;
 695         ssize_t ret = 0;
 696         u64 pcount;
 697
 698         pfn = src / KPMSIZE;
 699         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 700         if (src & KPMMASK || count & KPMMASK)
 701                 return -EINVAL;
 702
 703         while (count > 0) {
 704                 ppage = NULL;
 705                 if (pfn_valid(pfn))
 706                         ppage = pfn_to_page(pfn);
 707                 pfn++;
 708                 if (!ppage)
 709                         pcount = 0;
 710                 else
 711                         pcount = page_mapcount(ppage);
 712
 713                 if (put_user(pcount, out++)) {
 714                         ret = -EFAULT;
 715                         break;
 716                 }
 717
 718                 count -= KPMSIZE;
 719         }
 720
 721         *ppos += (char __user *)out - buf;
 722         if (!ret)
 723                 ret = (char __user *)out - buf;
 724         return ret;
 725 }
 726
 727 static struct file_operations proc_kpagecount_operations = {
 728         .llseek = mem_lseek,
 729         .read = kpagecount_read,
 730 };
 731
 732 /* /proc/kpageflags - an array exposing page flags
 733  *
 734  * Each entry is a u64 representing the corresponding
 735  * physical page flags.
 736  */
 737
 738 /* These macros are used to decouple internal flags from exported ones */
 739
 740 #define KPF_LOCKED     0
 741 #define KPF_ERROR      1
 742 #define KPF_REFERENCED 2
 743 #define KPF_UPTODATE   3
 744 #define KPF_DIRTY      4
 745 #define KPF_LRU        5
 746 #define KPF_ACTIVE     6
 747 #define KPF_SLAB       7
 748 #define KPF_WRITEBACK  8
 749 #define KPF_RECLAIM    9
 750 #define KPF_BUDDY     10
 751
 752 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 753
 754 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 755                              size_t count, loff_t *ppos)
 756 {
 757         u64 __user *out = (u64 __user *)buf;
 758         struct page *ppage;
 759         unsigned long src = *ppos;
 760         unsigned long pfn;
 761         ssize_t ret = 0;
 762         u64 kflags, uflags;
 763
 764         pfn = src / KPMSIZE;
 765         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 766         if (src & KPMMASK || count & KPMMASK)
 767                 return -EINVAL;
 768
 769         while (count > 0) {
 770                 ppage = NULL;
 771                 if (pfn_valid(pfn))
 772                         ppage = pfn_to_page(pfn);
 773                 pfn++;
 774                 if (!ppage)
 775                         kflags = 0;
 776                 else
 777                         kflags = ppage->flags;
 778
 779                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 780                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 781                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 782                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 783                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 784                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 785                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 786                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 787                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 788                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 789                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 790
 791                 if (put_user(uflags, out++)) {
 792                         ret = -EFAULT;
 793                         break;
 794                 }
 795
 796                 count -= KPMSIZE;
 797         }
 798
 799         *ppos += (char __user *)out - buf;
 800         if (!ret)
 801                 ret = (char __user *)out - buf;
 802         return ret;
 803 }
 804
 805 static struct file_operations proc_kpageflags_operations = {
 806         .llseek = mem_lseek,
 807         .read = kpageflags_read,
 808 };
 809 #endif /* CONFIG_PROC_PAGE_MONITOR */
 810
 811 struct proc_dir_entry *proc_root_kcore;
 812
 813 void __init proc_misc_init(void)
 814 {
 815         static struct {
 816                 char *name;
 817                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 818         } *p, simple_ones[] = {
 819                 {"meminfo",     meminfo_read_proc},
 820                 {"version",     version_read_proc},
 821 #ifdef CONFIG_PROC_HARDWARE
 822                 {"hardware",    hardware_read_proc},
 823 #endif
 824 #ifdef CONFIG_STRAM_PROC
 825                 {"stram",       stram_read_proc},
 826 #endif
 827                 {"filesystems", filesystems_read_proc},
 828                 {"cmdline",     cmdline_read_proc},
 829                 {"execdomains", execdomains_read_proc},
 830                 {NULL,}
 831         };
 832         for (p = simple_ones; p->name; p++)
 833                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 834
 835         proc_symlink("mounts", NULL, "self/mounts");
 836
 837         /* And now for trickier ones */
 838 #ifdef CONFIG_PRINTK
 839         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 840 #endif
 841 #ifdef CONFIG_FILE_LOCKING
 842         proc_create("locks", 0, NULL, &proc_locks_operations);
 843 #endif
 844         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 845         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 846 #ifdef CONFIG_BLOCK
 847         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 848 #endif
 849         proc_create("stat", 0, NULL, &proc_stat_operations);
 850         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 851 #ifdef CONFIG_SLABINFO
 852         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 853 #ifdef CONFIG_DEBUG_SLAB_LEAK
 854         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 855 #endif
 856 #endif
 857 #ifdef CONFIG_MMU
 858         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 859 #endif
 860         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 861         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 862         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 863         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 864 #ifdef CONFIG_BLOCK
 865         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 866 #endif
 867 #ifdef CONFIG_MODULES
 868         proc_create("modules", 0, NULL, &proc_modules_operations);
 869 #endif
 870 #ifdef CONFIG_SCHEDSTATS
 871         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 872 #endif
 873 #ifdef CONFIG_PROC_KCORE
 874         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 875         if (proc_root_kcore)
 876                 proc_root_kcore->size =
 877                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 878 #endif
 879 #ifdef CONFIG_PROC_PAGE_MONITOR
 880         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 881         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 882 #endif
 883 #ifdef CONFIG_PROC_VMCORE
 884         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 885 #endif
 886 }