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   1 /*
   2  *  linux/fs/proc/proc_misc.c
   3  *
   4  *  linux/fs/proc/array.c
   5  *  Copyright (C) 1992  by Linus Torvalds
   6  *  based on ideas by Darren Senn
   7  *
   8  *  This used to be the part of array.c. See the rest of history and credits
   9  *  there. I took this into a separate file and switched the thing to generic
  10  *  proc_file_inode_operations, leaving in array.c only per-process stuff.
  11  *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
  12  *
  13  * Changes:
  14  * Fulton Green      :  Encapsulated position metric calculations.
  15  *                      <kernel@FultonGreen.com>
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/time.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/fs.h>
  24 #include <linux/tty.h>
  25 #include <linux/string.h>
  26 #include <linux/mman.h>
  27 #include <linux/quicklist.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/ioport.h>
  30 #include <linux/mm.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/swap.h>
  35 #include <linux/slab.h>
  36 #include <linux/genhd.h>
  37 #include <linux/smp.h>
  38 #include <linux/signal.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/times.h>
  43 #include <linux/profile.h>
  44 #include <linux/utsname.h>
  45 #include <linux/blkdev.h>
  46 #include <linux/hugetlb.h>
  47 #include <linux/jiffies.h>
  48 #include <linux/vmalloc.h>
  49 #include <linux/crash_dump.h>
  50 #include <linux/pid_namespace.h>
  51 #include <linux/bootmem.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/pgtable.h>
  54 #include <asm/io.h>
  55 #include <asm/tlb.h>
  56 #include <asm/div64.h>
  57 #include "internal.h"
  58
  59 #define LOAD_INT(x) ((x) >> FSHIFT)
  60 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  61 /*
  62  * Warning: stuff below (imported functions) assumes that its output will fit
  63  * into one page. For some of those functions it may be wrong. Moreover, we
  64  * have a way to deal with that gracefully. Right now I used straightforward
  65  * wrappers, but this needs further analysis wrt potential overflows.
  66  */
  67 extern int get_hardware_list(char *);
  68 extern int get_stram_list(char *);
  69 extern int get_exec_domain_list(char *);
  70
  71 static int proc_calc_metrics(char *page, char **start, off_t off,
  72                                  int count, int *eof, int len)
  73 {
  74         if (len <= off+count) *eof = 1;
  75         *start = page + off;
  76         len -= off;
  77         if (len>count) len = count;
  78         if (len<0) len = 0;
  79         return len;
  80 }
  81
  82 static int loadavg_read_proc(char *page, char **start, off_t off,
  83                                  int count, int *eof, void *data)
  84 {
  85         int a, b, c;
  86         int len;
  87         unsigned long seq;
  88
  89         do {
  90                 seq = read_seqbegin(&xtime_lock);
  91                 a = avenrun[0] + (FIXED_1/200);
  92                 b = avenrun[1] + (FIXED_1/200);
  93                 c = avenrun[2] + (FIXED_1/200);
  94         } while (read_seqretry(&xtime_lock, seq));
  95
  96         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  97                 LOAD_INT(a), LOAD_FRAC(a),
  98                 LOAD_INT(b), LOAD_FRAC(b),
  99                 LOAD_INT(c), LOAD_FRAC(c),
 100                 nr_running(), nr_threads,
 101                 task_active_pid_ns(current)->last_pid);
 102         return proc_calc_metrics(page, start, off, count, eof, len);
 103 }
 104
 105 static int uptime_read_proc(char *page, char **start, off_t off,
 106                                  int count, int *eof, void *data)
 107 {
 108         struct timespec uptime;
 109         struct timespec idle;
 110         int len;
 111         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 112
 113         do_posix_clock_monotonic_gettime(&uptime);
 114         monotonic_to_bootbased(&uptime);
 115         cputime_to_timespec(idletime, &idle);
 116         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 117                         (unsigned long) uptime.tv_sec,
 118                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 119                         (unsigned long) idle.tv_sec,
 120                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 121
 122         return proc_calc_metrics(page, start, off, count, eof, len);
 123 }
 124
 125 int __attribute__((weak)) arch_report_meminfo(char *page)
 126 {
 127         return 0;
 128 }
 129
 130 static int meminfo_read_proc(char *page, char **start, off_t off,
 131                                  int count, int *eof, void *data)
 132 {
 133         struct sysinfo i;
 134         int len;
 135         unsigned long committed;
 136         unsigned long allowed;
 137         struct vmalloc_info vmi;
 138         long cached;
 139         unsigned long pages[NR_LRU_LISTS];
 140         int lru;
 141
 142 /*
 143  * display in kilobytes.
 144  */
 145 #define K(x) ((x) << (PAGE_SHIFT - 10))
 146         si_meminfo(&i);
 147         si_swapinfo(&i);
 148         committed = atomic_long_read(&vm_committed_space);
 149         allowed = ((totalram_pages - hugetlb_total_pages())
 150                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 151
 152         cached = global_page_state(NR_FILE_PAGES) -
 153                         total_swapcache_pages - i.bufferram;
 154         if (cached < 0)
 155                 cached = 0;
 156
 157         get_vmalloc_info(&vmi);
 158
 159         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
 160                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
 161
 162         /*
 163          * Tagged format, for easy grepping and expansion.
 164          */
 165         len = sprintf(page,
 166                 "MemTotal:       %8lu kB\n"
 167                 "MemFree:        %8lu kB\n"
 168                 "Buffers:        %8lu kB\n"
 169                 "Cached:         %8lu kB\n"
 170                 "SwapCached:     %8lu kB\n"
 171                 "Active:         %8lu kB\n"
 172                 "Inactive:       %8lu kB\n"
 173                 "Active(anon):   %8lu kB\n"
 174                 "Inactive(anon): %8lu kB\n"
 175                 "Active(file):   %8lu kB\n"
 176                 "Inactive(file): %8lu kB\n"
 177 #ifdef CONFIG_HIGHMEM
 178                 "HighTotal:      %8lu kB\n"
 179                 "HighFree:       %8lu kB\n"
 180                 "LowTotal:       %8lu kB\n"
 181                 "LowFree:        %8lu kB\n"
 182 #endif
 183                 "SwapTotal:      %8lu kB\n"
 184                 "SwapFree:       %8lu kB\n"
 185                 "Dirty:          %8lu kB\n"
 186                 "Writeback:      %8lu kB\n"
 187                 "AnonPages:      %8lu kB\n"
 188                 "Mapped:         %8lu kB\n"
 189                 "Slab:           %8lu kB\n"
 190                 "SReclaimable:   %8lu kB\n"
 191                 "SUnreclaim:     %8lu kB\n"
 192                 "PageTables:     %8lu kB\n"
 193 #ifdef CONFIG_QUICKLIST
 194                 "Quicklists:     %8lu kB\n"
 195 #endif
 196                 "NFS_Unstable:   %8lu kB\n"
 197                 "Bounce:         %8lu kB\n"
 198                 "WritebackTmp:   %8lu kB\n"
 199                 "CommitLimit:    %8lu kB\n"
 200                 "Committed_AS:   %8lu kB\n"
 201                 "VmallocTotal:   %8lu kB\n"
 202                 "VmallocUsed:    %8lu kB\n"
 203                 "VmallocChunk:   %8lu kB\n",
 204                 K(i.totalram),
 205                 K(i.freeram),
 206                 K(i.bufferram),
 207                 K(cached),
 208                 K(total_swapcache_pages),
 209                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 210                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 211                 K(pages[LRU_ACTIVE_ANON]),
 212                 K(pages[LRU_INACTIVE_ANON]),
 213                 K(pages[LRU_ACTIVE_FILE]),
 214                 K(pages[LRU_INACTIVE_FILE]),
 215 #ifdef CONFIG_HIGHMEM
 216                 K(i.totalhigh),
 217                 K(i.freehigh),
 218                 K(i.totalram-i.totalhigh),
 219                 K(i.freeram-i.freehigh),
 220 #endif
 221                 K(i.totalswap),
 222                 K(i.freeswap),
 223                 K(global_page_state(NR_FILE_DIRTY)),
 224                 K(global_page_state(NR_WRITEBACK)),
 225                 K(global_page_state(NR_ANON_PAGES)),
 226                 K(global_page_state(NR_FILE_MAPPED)),
 227                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 228                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 229                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 230                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 231                 K(global_page_state(NR_PAGETABLE)),
 232 #ifdef CONFIG_QUICKLIST
 233                 K(quicklist_total_size()),
 234 #endif
 235                 K(global_page_state(NR_UNSTABLE_NFS)),
 236                 K(global_page_state(NR_BOUNCE)),
 237                 K(global_page_state(NR_WRITEBACK_TEMP)),
 238                 K(allowed),
 239                 K(committed),
 240                 (unsigned long)VMALLOC_TOTAL >> 10,
 241                 vmi.used >> 10,
 242                 vmi.largest_chunk >> 10
 243                 );
 244
 245                 len += hugetlb_report_meminfo(page + len);
 246
 247         len += arch_report_meminfo(page + len);
 248
 249         return proc_calc_metrics(page, start, off, count, eof, len);
 250 #undef K
 251 }
 252
 253 static int fragmentation_open(struct inode *inode, struct file *file)
 254 {
 255         (void)inode;
 256         return seq_open(file, &fragmentation_op);
 257 }
 258
 259 static const struct file_operations fragmentation_file_operations = {
 260         .open           = fragmentation_open,
 261         .read           = seq_read,
 262         .llseek         = seq_lseek,
 263         .release        = seq_release,
 264 };
 265
 266 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 267 {
 268         return seq_open(file, &pagetypeinfo_op);
 269 }
 270
 271 static const struct file_operations pagetypeinfo_file_ops = {
 272         .open           = pagetypeinfo_open,
 273         .read           = seq_read,
 274         .llseek         = seq_lseek,
 275         .release        = seq_release,
 276 };
 277
 278 static int zoneinfo_open(struct inode *inode, struct file *file)
 279 {
 280         return seq_open(file, &zoneinfo_op);
 281 }
 282
 283 static const struct file_operations proc_zoneinfo_file_operations = {
 284         .open           = zoneinfo_open,
 285         .read           = seq_read,
 286         .llseek         = seq_lseek,
 287         .release        = seq_release,
 288 };
 289
 290 static int version_read_proc(char *page, char **start, off_t off,
 291                                  int count, int *eof, void *data)
 292 {
 293         int len;
 294
 295         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 296                 utsname()->sysname,
 297                 utsname()->release,
 298                 utsname()->version);
 299         return proc_calc_metrics(page, start, off, count, eof, len);
 300 }
 301
 302 extern const struct seq_operations cpuinfo_op;
 303 static int cpuinfo_open(struct inode *inode, struct file *file)
 304 {
 305         return seq_open(file, &cpuinfo_op);
 306 }
 307
 308 static const struct file_operations proc_cpuinfo_operations = {
 309         .open           = cpuinfo_open,
 310         .read           = seq_read,
 311         .llseek         = seq_lseek,
 312         .release        = seq_release,
 313 };
 314
 315 static int devinfo_show(struct seq_file *f, void *v)
 316 {
 317         int i = *(loff_t *) v;
 318
 319         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 320                 if (i == 0)
 321                         seq_printf(f, "Character devices:\n");
 322                 chrdev_show(f, i);
 323         }
 324 #ifdef CONFIG_BLOCK
 325         else {
 326                 i -= CHRDEV_MAJOR_HASH_SIZE;
 327                 if (i == 0)
 328                         seq_printf(f, "\nBlock devices:\n");
 329                 blkdev_show(f, i);
 330         }
 331 #endif
 332         return 0;
 333 }
 334
 335 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 336 {
 337         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 338                 return pos;
 339         return NULL;
 340 }
 341
 342 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 343 {
 344         (*pos)++;
 345         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 346                 return NULL;
 347         return pos;
 348 }
 349
 350 static void devinfo_stop(struct seq_file *f, void *v)
 351 {
 352         /* Nothing to do */
 353 }
 354
 355 static const struct seq_operations devinfo_ops = {
 356         .start = devinfo_start,
 357         .next  = devinfo_next,
 358         .stop  = devinfo_stop,
 359         .show  = devinfo_show
 360 };
 361
 362 static int devinfo_open(struct inode *inode, struct file *filp)
 363 {
 364         return seq_open(filp, &devinfo_ops);
 365 }
 366
 367 static const struct file_operations proc_devinfo_operations = {
 368         .open           = devinfo_open,
 369         .read           = seq_read,
 370         .llseek         = seq_lseek,
 371         .release        = seq_release,
 372 };
 373
 374 static int vmstat_open(struct inode *inode, struct file *file)
 375 {
 376         return seq_open(file, &vmstat_op);
 377 }
 378 static const struct file_operations proc_vmstat_file_operations = {
 379         .open           = vmstat_open,
 380         .read           = seq_read,
 381         .llseek         = seq_lseek,
 382         .release        = seq_release,
 383 };
 384
 385 #ifdef CONFIG_PROC_HARDWARE
 386 static int hardware_read_proc(char *page, char **start, off_t off,
 387                                  int count, int *eof, void *data)
 388 {
 389         int len = get_hardware_list(page);
 390         return proc_calc_metrics(page, start, off, count, eof, len);
 391 }
 392 #endif
 393
 394 #ifdef CONFIG_STRAM_PROC
 395 static int stram_read_proc(char *page, char **start, off_t off,
 396                                  int count, int *eof, void *data)
 397 {
 398         int len = get_stram_list(page);
 399         return proc_calc_metrics(page, start, off, count, eof, len);
 400 }
 401 #endif
 402
 403 #ifdef CONFIG_BLOCK
 404 static int partitions_open(struct inode *inode, struct file *file)
 405 {
 406         return seq_open(file, &partitions_op);
 407 }
 408 static const struct file_operations proc_partitions_operations = {
 409         .open           = partitions_open,
 410         .read           = seq_read,
 411         .llseek         = seq_lseek,
 412         .release        = seq_release,
 413 };
 414
 415 static int diskstats_open(struct inode *inode, struct file *file)
 416 {
 417         return seq_open(file, &diskstats_op);
 418 }
 419 static const struct file_operations proc_diskstats_operations = {
 420         .open           = diskstats_open,
 421         .read           = seq_read,
 422         .llseek         = seq_lseek,
 423         .release        = seq_release,
 424 };
 425 #endif
 426
 427 #ifdef CONFIG_MODULES
 428 extern const struct seq_operations modules_op;
 429 static int modules_open(struct inode *inode, struct file *file)
 430 {
 431         return seq_open(file, &modules_op);
 432 }
 433 static const struct file_operations proc_modules_operations = {
 434         .open           = modules_open,
 435         .read           = seq_read,
 436         .llseek         = seq_lseek,
 437         .release        = seq_release,
 438 };
 439 #endif
 440
 441 #ifdef CONFIG_SLABINFO
 442 static int slabinfo_open(struct inode *inode, struct file *file)
 443 {
 444         return seq_open(file, &slabinfo_op);
 445 }
 446 static const struct file_operations proc_slabinfo_operations = {
 447         .open           = slabinfo_open,
 448         .read           = seq_read,
 449         .write          = slabinfo_write,
 450         .llseek         = seq_lseek,
 451         .release        = seq_release,
 452 };
 453
 454 #ifdef CONFIG_DEBUG_SLAB_LEAK
 455 extern const struct seq_operations slabstats_op;
 456 static int slabstats_open(struct inode *inode, struct file *file)
 457 {
 458         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 459         int ret = -ENOMEM;
 460         if (n) {
 461                 ret = seq_open(file, &slabstats_op);
 462                 if (!ret) {
 463                         struct seq_file *m = file->private_data;
 464                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 465                         m->private = n;
 466                         n = NULL;
 467                 }
 468                 kfree(n);
 469         }
 470         return ret;
 471 }
 472
 473 static const struct file_operations proc_slabstats_operations = {
 474         .open           = slabstats_open,
 475         .read           = seq_read,
 476         .llseek         = seq_lseek,
 477         .release        = seq_release_private,
 478 };
 479 #endif
 480 #endif
 481
 482 #ifdef CONFIG_MMU
 483 static int vmalloc_open(struct inode *inode, struct file *file)
 484 {
 485         unsigned int *ptr = NULL;
 486         int ret;
 487
 488         if (NUMA_BUILD)
 489                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 490         ret = seq_open(file, &vmalloc_op);
 491         if (!ret) {
 492                 struct seq_file *m = file->private_data;
 493                 m->private = ptr;
 494         } else
 495                 kfree(ptr);
 496         return ret;
 497 }
 498
 499 static const struct file_operations proc_vmalloc_operations = {
 500         .open           = vmalloc_open,
 501         .read           = seq_read,
 502         .llseek         = seq_lseek,
 503         .release        = seq_release_private,
 504 };
 505 #endif
 506
 507 #ifndef arch_irq_stat_cpu
 508 #define arch_irq_stat_cpu(cpu) 0
 509 #endif
 510 #ifndef arch_irq_stat
 511 #define arch_irq_stat() 0
 512 #endif
 513
 514 static int show_stat(struct seq_file *p, void *v)
 515 {
 516         int i;
 517         unsigned long jif;
 518         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 519         cputime64_t guest;
 520         u64 sum = 0;
 521         struct timespec boottime;
 522         unsigned int *per_irq_sum;
 523
 524         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 525         if (!per_irq_sum)
 526                 return -ENOMEM;
 527
 528         user = nice = system = idle = iowait =
 529                 irq = softirq = steal = cputime64_zero;
 530         guest = cputime64_zero;
 531         getboottime(&boottime);
 532         jif = boottime.tv_sec;
 533
 534         for_each_possible_cpu(i) {
 535                 int j;
 536
 537                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 538                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 539                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 540                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 541                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 542                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 543                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 544                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 545                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 546                 for (j = 0; j < NR_IRQS; j++) {
 547                         unsigned int temp = kstat_cpu(i).irqs[j];
 548                         sum += temp;
 549                         per_irq_sum[j] += temp;
 550                 }
 551                 sum += arch_irq_stat_cpu(i);
 552         }
 553         sum += arch_irq_stat();
 554
 555         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 556                 (unsigned long long)cputime64_to_clock_t(user),
 557                 (unsigned long long)cputime64_to_clock_t(nice),
 558                 (unsigned long long)cputime64_to_clock_t(system),
 559                 (unsigned long long)cputime64_to_clock_t(idle),
 560                 (unsigned long long)cputime64_to_clock_t(iowait),
 561                 (unsigned long long)cputime64_to_clock_t(irq),
 562                 (unsigned long long)cputime64_to_clock_t(softirq),
 563                 (unsigned long long)cputime64_to_clock_t(steal),
 564                 (unsigned long long)cputime64_to_clock_t(guest));
 565         for_each_online_cpu(i) {
 566
 567                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 568                 user = kstat_cpu(i).cpustat.user;
 569                 nice = kstat_cpu(i).cpustat.nice;
 570                 system = kstat_cpu(i).cpustat.system;
 571                 idle = kstat_cpu(i).cpustat.idle;
 572                 iowait = kstat_cpu(i).cpustat.iowait;
 573                 irq = kstat_cpu(i).cpustat.irq;
 574                 softirq = kstat_cpu(i).cpustat.softirq;
 575                 steal = kstat_cpu(i).cpustat.steal;
 576                 guest = kstat_cpu(i).cpustat.guest;
 577                 seq_printf(p,
 578                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 579                         i,
 580                         (unsigned long long)cputime64_to_clock_t(user),
 581                         (unsigned long long)cputime64_to_clock_t(nice),
 582                         (unsigned long long)cputime64_to_clock_t(system),
 583                         (unsigned long long)cputime64_to_clock_t(idle),
 584                         (unsigned long long)cputime64_to_clock_t(iowait),
 585                         (unsigned long long)cputime64_to_clock_t(irq),
 586                         (unsigned long long)cputime64_to_clock_t(softirq),
 587                         (unsigned long long)cputime64_to_clock_t(steal),
 588                         (unsigned long long)cputime64_to_clock_t(guest));
 589         }
 590         seq_printf(p, "intr %llu", (unsigned long long)sum);
 591
 592         for (i = 0; i < NR_IRQS; i++)
 593                 seq_printf(p, " %u", per_irq_sum[i]);
 594
 595         seq_printf(p,
 596                 "\nctxt %llu\n"
 597                 "btime %lu\n"
 598                 "processes %lu\n"
 599                 "procs_running %lu\n"
 600                 "procs_blocked %lu\n",
 601                 nr_context_switches(),
 602                 (unsigned long)jif,
 603                 total_forks,
 604                 nr_running(),
 605                 nr_iowait());
 606
 607         kfree(per_irq_sum);
 608         return 0;
 609 }
 610
 611 static int stat_open(struct inode *inode, struct file *file)
 612 {
 613         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 614         char *buf;
 615         struct seq_file *m;
 616         int res;
 617
 618         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 619         if (size > 128 * 1024)
 620                 size = 128 * 1024;
 621         buf = kmalloc(size, GFP_KERNEL);
 622         if (!buf)
 623                 return -ENOMEM;
 624
 625         res = single_open(file, show_stat, NULL);
 626         if (!res) {
 627                 m = file->private_data;
 628                 m->buf = buf;
 629                 m->size = size;
 630         } else
 631                 kfree(buf);
 632         return res;
 633 }
 634 static const struct file_operations proc_stat_operations = {
 635         .open           = stat_open,
 636         .read           = seq_read,
 637         .llseek         = seq_lseek,
 638         .release        = single_release,
 639 };
 640
 641 /*
 642  * /proc/interrupts
 643  */
 644 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 645 {
 646         return (*pos <= NR_IRQS) ? pos : NULL;
 647 }
 648
 649 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 650 {
 651         (*pos)++;
 652         if (*pos > NR_IRQS)
 653                 return NULL;
 654         return pos;
 655 }
 656
 657 static void int_seq_stop(struct seq_file *f, void *v)
 658 {
 659         /* Nothing to do */
 660 }
 661
 662
 663 static const struct seq_operations int_seq_ops = {
 664         .start = int_seq_start,
 665         .next  = int_seq_next,
 666         .stop  = int_seq_stop,
 667         .show  = show_interrupts
 668 };
 669
 670 static int interrupts_open(struct inode *inode, struct file *filp)
 671 {
 672         return seq_open(filp, &int_seq_ops);
 673 }
 674
 675 static const struct file_operations proc_interrupts_operations = {
 676         .open           = interrupts_open,
 677         .read           = seq_read,
 678         .llseek         = seq_lseek,
 679         .release        = seq_release,
 680 };
 681
 682 static int filesystems_read_proc(char *page, char **start, off_t off,
 683                                  int count, int *eof, void *data)
 684 {
 685         int len = get_filesystem_list(page);
 686         return proc_calc_metrics(page, start, off, count, eof, len);
 687 }
 688
 689 static int cmdline_read_proc(char *page, char **start, off_t off,
 690                                  int count, int *eof, void *data)
 691 {
 692         int len;
 693
 694         len = sprintf(page, "%s\n", saved_command_line);
 695         return proc_calc_metrics(page, start, off, count, eof, len);
 696 }
 697
 698 #ifdef CONFIG_FILE_LOCKING
 699 static int locks_open(struct inode *inode, struct file *filp)
 700 {
 701         return seq_open(filp, &locks_seq_operations);
 702 }
 703
 704 static const struct file_operations proc_locks_operations = {
 705         .open           = locks_open,
 706         .read           = seq_read,
 707         .llseek         = seq_lseek,
 708         .release        = seq_release,
 709 };
 710 #endif /* CONFIG_FILE_LOCKING */
 711
 712 static int execdomains_read_proc(char *page, char **start, off_t off,
 713                                  int count, int *eof, void *data)
 714 {
 715         int len = get_exec_domain_list(page);
 716         return proc_calc_metrics(page, start, off, count, eof, len);
 717 }
 718
 719 #ifdef CONFIG_PROC_PAGE_MONITOR
 720 #define KPMSIZE sizeof(u64)
 721 #define KPMMASK (KPMSIZE - 1)
 722 /* /proc/kpagecount - an array exposing page counts
 723  *
 724  * Each entry is a u64 representing the corresponding
 725  * physical page count.
 726  */
 727 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 728                              size_t count, loff_t *ppos)
 729 {
 730         u64 __user *out = (u64 __user *)buf;
 731         struct page *ppage;
 732         unsigned long src = *ppos;
 733         unsigned long pfn;
 734         ssize_t ret = 0;
 735         u64 pcount;
 736
 737         pfn = src / KPMSIZE;
 738         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 739         if (src & KPMMASK || count & KPMMASK)
 740                 return -EINVAL;
 741
 742         while (count > 0) {
 743                 ppage = NULL;
 744                 if (pfn_valid(pfn))
 745                         ppage = pfn_to_page(pfn);
 746                 pfn++;
 747                 if (!ppage)
 748                         pcount = 0;
 749                 else
 750                         pcount = page_mapcount(ppage);
 751
 752                 if (put_user(pcount, out++)) {
 753                         ret = -EFAULT;
 754                         break;
 755                 }
 756
 757                 count -= KPMSIZE;
 758         }
 759
 760         *ppos += (char __user *)out - buf;
 761         if (!ret)
 762                 ret = (char __user *)out - buf;
 763         return ret;
 764 }
 765
 766 static struct file_operations proc_kpagecount_operations = {
 767         .llseek = mem_lseek,
 768         .read = kpagecount_read,
 769 };
 770
 771 /* /proc/kpageflags - an array exposing page flags
 772  *
 773  * Each entry is a u64 representing the corresponding
 774  * physical page flags.
 775  */
 776
 777 /* These macros are used to decouple internal flags from exported ones */
 778
 779 #define KPF_LOCKED     0
 780 #define KPF_ERROR      1
 781 #define KPF_REFERENCED 2
 782 #define KPF_UPTODATE   3
 783 #define KPF_DIRTY      4
 784 #define KPF_LRU        5
 785 #define KPF_ACTIVE     6
 786 #define KPF_SLAB       7
 787 #define KPF_WRITEBACK  8
 788 #define KPF_RECLAIM    9
 789 #define KPF_BUDDY     10
 790
 791 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 792
 793 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 794                              size_t count, loff_t *ppos)
 795 {
 796         u64 __user *out = (u64 __user *)buf;
 797         struct page *ppage;
 798         unsigned long src = *ppos;
 799         unsigned long pfn;
 800         ssize_t ret = 0;
 801         u64 kflags, uflags;
 802
 803         pfn = src / KPMSIZE;
 804         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 805         if (src & KPMMASK || count & KPMMASK)
 806                 return -EINVAL;
 807
 808         while (count > 0) {
 809                 ppage = NULL;
 810                 if (pfn_valid(pfn))
 811                         ppage = pfn_to_page(pfn);
 812                 pfn++;
 813                 if (!ppage)
 814                         kflags = 0;
 815                 else
 816                         kflags = ppage->flags;
 817
 818                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 819                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 820                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 821                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 822                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 823                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 824                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 825                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 826                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 827                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 828                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 829
 830                 if (put_user(uflags, out++)) {
 831                         ret = -EFAULT;
 832                         break;
 833                 }
 834
 835                 count -= KPMSIZE;
 836         }
 837
 838         *ppos += (char __user *)out - buf;
 839         if (!ret)
 840                 ret = (char __user *)out - buf;
 841         return ret;
 842 }
 843
 844 static struct file_operations proc_kpageflags_operations = {
 845         .llseek = mem_lseek,
 846         .read = kpageflags_read,
 847 };
 848 #endif /* CONFIG_PROC_PAGE_MONITOR */
 849
 850 struct proc_dir_entry *proc_root_kcore;
 851
 852 void __init proc_misc_init(void)
 853 {
 854         static struct {
 855                 char *name;
 856                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 857         } *p, simple_ones[] = {
 858                 {"loadavg",     loadavg_read_proc},
 859                 {"uptime",      uptime_read_proc},
 860                 {"meminfo",     meminfo_read_proc},
 861                 {"version",     version_read_proc},
 862 #ifdef CONFIG_PROC_HARDWARE
 863                 {"hardware",    hardware_read_proc},
 864 #endif
 865 #ifdef CONFIG_STRAM_PROC
 866                 {"stram",       stram_read_proc},
 867 #endif
 868                 {"filesystems", filesystems_read_proc},
 869                 {"cmdline",     cmdline_read_proc},
 870                 {"execdomains", execdomains_read_proc},
 871                 {NULL,}
 872         };
 873         for (p = simple_ones; p->name; p++)
 874                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 875
 876         proc_symlink("mounts", NULL, "self/mounts");
 877
 878         /* And now for trickier ones */
 879 #ifdef CONFIG_PRINTK
 880         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 881 #endif
 882 #ifdef CONFIG_FILE_LOCKING
 883         proc_create("locks", 0, NULL, &proc_locks_operations);
 884 #endif
 885         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 886         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 887 #ifdef CONFIG_BLOCK
 888         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 889 #endif
 890         proc_create("stat", 0, NULL, &proc_stat_operations);
 891         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 892 #ifdef CONFIG_SLABINFO
 893         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 894 #ifdef CONFIG_DEBUG_SLAB_LEAK
 895         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 896 #endif
 897 #endif
 898 #ifdef CONFIG_MMU
 899         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 900 #endif
 901         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 902         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 903         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 904         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 905 #ifdef CONFIG_BLOCK
 906         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 907 #endif
 908 #ifdef CONFIG_MODULES
 909         proc_create("modules", 0, NULL, &proc_modules_operations);
 910 #endif
 911 #ifdef CONFIG_SCHEDSTATS
 912         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 913 #endif
 914 #ifdef CONFIG_PROC_KCORE
 915         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 916         if (proc_root_kcore)
 917                 proc_root_kcore->size =
 918                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 919 #endif
 920 #ifdef CONFIG_PROC_PAGE_MONITOR
 921         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 922         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 923 #endif
 924 #ifdef CONFIG_PROC_VMCORE
 925         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 926 #endif
 927 }