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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/proc_fs.h>
  28 #include <linux/ioport.h>
  29 #include <linux/config.h>
  30 #include <linux/mm.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/swap.h>
  34 #include <linux/slab.h>
  35 #include <linux/smp.h>
  36 #include <linux/signal.h>
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/smp_lock.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/times.h>
  42 #include <linux/profile.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/hugetlb.h>
  45 #include <linux/jiffies.h>
  46 #include <linux/sysrq.h>
  47 #include <linux/vmalloc.h>
  48 #include <linux/crash_dump.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/io.h>
  52 #include <asm/tlb.h>
  53 #include <asm/div64.h>
  54 #include "internal.h"
  55
  56 #define LOAD_INT(x) ((x) >> FSHIFT)
  57 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  58 /*
  59  * Warning: stuff below (imported functions) assumes that its output will fit
  60  * into one page. For some of those functions it may be wrong. Moreover, we
  61  * have a way to deal with that gracefully. Right now I used straightforward
  62  * wrappers, but this needs further analysis wrt potential overflows.
  63  */
  64 extern int get_hardware_list(char *);
  65 extern int get_stram_list(char *);
  66 extern int get_filesystem_list(char *);
  67 extern int get_exec_domain_list(char *);
  68 extern int get_dma_list(char *);
  69 extern int get_locks_status (char *, char **, off_t, int);
  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
  88         a = avenrun[0] + (FIXED_1/200);
  89         b = avenrun[1] + (FIXED_1/200);
  90         c = avenrun[2] + (FIXED_1/200);
  91         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  92                 LOAD_INT(a), LOAD_FRAC(a),
  93                 LOAD_INT(b), LOAD_FRAC(b),
  94                 LOAD_INT(c), LOAD_FRAC(c),
  95                 nr_running(), nr_threads, last_pid);
  96         return proc_calc_metrics(page, start, off, count, eof, len);
  97 }
  98
  99 static int uptime_read_proc(char *page, char **start, off_t off,
 100                                  int count, int *eof, void *data)
 101 {
 102         struct timespec uptime;
 103         struct timespec idle;
 104         int len;
 105         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 106
 107         do_posix_clock_monotonic_gettime(&uptime);
 108         cputime_to_timespec(idletime, &idle);
 109         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 110                         (unsigned long) uptime.tv_sec,
 111                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 112                         (unsigned long) idle.tv_sec,
 113                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 114
 115         return proc_calc_metrics(page, start, off, count, eof, len);
 116 }
 117
 118 static int meminfo_read_proc(char *page, char **start, off_t off,
 119                                  int count, int *eof, void *data)
 120 {
 121         struct sysinfo i;
 122         int len;
 123         struct page_state ps;
 124         unsigned long inactive;
 125         unsigned long active;
 126         unsigned long free;
 127         unsigned long committed;
 128         unsigned long allowed;
 129         struct vmalloc_info vmi;
 130         long cached;
 131
 132         get_page_state(&ps);
 133         get_zone_counts(&active, &inactive, &free);
 134
 135 /*
 136  * display in kilobytes.
 137  */
 138 #define K(x) ((x) << (PAGE_SHIFT - 10))
 139         si_meminfo(&i);
 140         si_swapinfo(&i);
 141         committed = atomic_read(&vm_committed_space);
 142         allowed = ((totalram_pages - hugetlb_total_pages())
 143                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 144
 145         cached = get_page_cache_size() - total_swapcache_pages - i.bufferram;
 146         if (cached < 0)
 147                 cached = 0;
 148
 149         get_vmalloc_info(&vmi);
 150
 151         /*
 152          * Tagged format, for easy grepping and expansion.
 153          */
 154         len = sprintf(page,
 155                 "MemTotal:     %8lu kB\n"
 156                 "MemFree:      %8lu kB\n"
 157                 "Buffers:      %8lu kB\n"
 158                 "Cached:       %8lu kB\n"
 159                 "SwapCached:   %8lu kB\n"
 160                 "Active:       %8lu kB\n"
 161                 "Inactive:     %8lu kB\n"
 162                 "HighTotal:    %8lu kB\n"
 163                 "HighFree:     %8lu kB\n"
 164                 "LowTotal:     %8lu kB\n"
 165                 "LowFree:      %8lu kB\n"
 166                 "SwapTotal:    %8lu kB\n"
 167                 "SwapFree:     %8lu kB\n"
 168                 "Dirty:        %8lu kB\n"
 169                 "Writeback:    %8lu kB\n"
 170                 "Mapped:       %8lu kB\n"
 171                 "Slab:         %8lu kB\n"
 172                 "CommitLimit:  %8lu kB\n"
 173                 "Committed_AS: %8lu kB\n"
 174                 "PageTables:   %8lu kB\n"
 175                 "VmallocTotal: %8lu kB\n"
 176                 "VmallocUsed:  %8lu kB\n"
 177                 "VmallocChunk: %8lu kB\n",
 178                 K(i.totalram),
 179                 K(i.freeram),
 180                 K(i.bufferram),
 181                 K(cached),
 182                 K(total_swapcache_pages),
 183                 K(active),
 184                 K(inactive),
 185                 K(i.totalhigh),
 186                 K(i.freehigh),
 187                 K(i.totalram-i.totalhigh),
 188                 K(i.freeram-i.freehigh),
 189                 K(i.totalswap),
 190                 K(i.freeswap),
 191                 K(ps.nr_dirty),
 192                 K(ps.nr_writeback),
 193                 K(ps.nr_mapped),
 194                 K(ps.nr_slab),
 195                 K(allowed),
 196                 K(committed),
 197                 K(ps.nr_page_table_pages),
 198                 (unsigned long)VMALLOC_TOTAL >> 10,
 199                 vmi.used >> 10,
 200                 vmi.largest_chunk >> 10
 201                 );
 202
 203                 len += hugetlb_report_meminfo(page + len);
 204
 205         return proc_calc_metrics(page, start, off, count, eof, len);
 206 #undef K
 207 }
 208
 209 extern struct seq_operations fragmentation_op;
 210 static int fragmentation_open(struct inode *inode, struct file *file)
 211 {
 212         (void)inode;
 213         return seq_open(file, &fragmentation_op);
 214 }
 215
 216 static struct file_operations fragmentation_file_operations = {
 217         .open           = fragmentation_open,
 218         .read           = seq_read,
 219         .llseek         = seq_lseek,
 220         .release        = seq_release,
 221 };
 222
 223 extern struct seq_operations zoneinfo_op;
 224 static int zoneinfo_open(struct inode *inode, struct file *file)
 225 {
 226         return seq_open(file, &zoneinfo_op);
 227 }
 228
 229 static struct file_operations proc_zoneinfo_file_operations = {
 230         .open           = zoneinfo_open,
 231         .read           = seq_read,
 232         .llseek         = seq_lseek,
 233         .release        = seq_release,
 234 };
 235
 236 static int version_read_proc(char *page, char **start, off_t off,
 237                                  int count, int *eof, void *data)
 238 {
 239         int len;
 240
 241         strcpy(page, linux_banner);
 242         len = strlen(page);
 243         return proc_calc_metrics(page, start, off, count, eof, len);
 244 }
 245
 246 extern struct seq_operations cpuinfo_op;
 247 static int cpuinfo_open(struct inode *inode, struct file *file)
 248 {
 249         return seq_open(file, &cpuinfo_op);
 250 }
 251
 252 enum devinfo_states {
 253         CHR_HDR,
 254         CHR_LIST,
 255         BLK_HDR,
 256         BLK_LIST,
 257         DEVINFO_DONE
 258 };
 259
 260 struct devinfo_state {
 261         void *chrdev;
 262         void *blkdev;
 263         unsigned int num_records;
 264         unsigned int cur_record;
 265         enum devinfo_states state;
 266 };
 267
 268 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 269 {
 270         struct devinfo_state *info = f->private;
 271
 272         if (*pos) {
 273                 if ((info) && (*pos <= info->num_records))
 274                         return info;
 275                 return NULL;
 276         }
 277         info = kmalloc(sizeof(*info), GFP_KERNEL);
 278         f->private = info;
 279         info->chrdev = acquire_chrdev_list();
 280         info->blkdev = acquire_blkdev_list();
 281         info->state = CHR_HDR;
 282         info->num_records = count_chrdev_list();
 283         info->num_records += count_blkdev_list();
 284         info->num_records += 2; /* Character and Block headers */
 285         *pos = 1;
 286         info->cur_record = *pos;
 287         return info;
 288 }
 289
 290 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 291 {
 292         int idummy;
 293         char *ndummy;
 294         struct devinfo_state *info = f->private;
 295
 296         switch (info->state) {
 297                 case CHR_HDR:
 298                         info->state = CHR_LIST;
 299                         (*pos)++;
 300                         /*fallthrough*/
 301                 case CHR_LIST:
 302                         if (get_chrdev_info(info->chrdev,&idummy,&ndummy)) {
 303                                 /*
 304                                  * The character dev list is complete
 305                                  */
 306                                 info->state = BLK_HDR;
 307                         } else {
 308                                 info->chrdev = get_next_chrdev(info->chrdev);
 309                         }
 310                         (*pos)++;
 311                         break;
 312                 case BLK_HDR:
 313                         info->state = BLK_LIST;
 314                         (*pos)++;
 315                         /*fallthrough*/
 316                 case BLK_LIST:
 317                         if (get_blkdev_info(info->blkdev,&idummy,&ndummy)) {
 318                                 /*
 319                                  * The block dev list is complete
 320                                  */
 321                                 info->state = DEVINFO_DONE;
 322                         } else {
 323                                 info->blkdev = get_next_blkdev(info->blkdev);
 324                         }
 325                         (*pos)++;
 326                         break;
 327                 case DEVINFO_DONE:
 328                         (*pos)++;
 329                         info->cur_record = *pos;
 330                         info = NULL;
 331                         break;
 332                 default:
 333                         break;
 334         }
 335         if (info)
 336                 info->cur_record = *pos;
 337         return info;
 338 }
 339
 340 static void devinfo_stop(struct seq_file *f, void *v)
 341 {
 342         struct devinfo_state *info = f->private;
 343
 344         if (info) {
 345                 release_chrdev_list(info->chrdev);
 346                 release_blkdev_list(info->blkdev);
 347                 f->private = NULL;
 348                 kfree(info);
 349         }
 350 }
 351
 352 static int devinfo_show(struct seq_file *f, void *arg)
 353 {
 354         int major;
 355         char *name;
 356         struct devinfo_state *info = f->private;
 357
 358         switch(info->state) {
 359                 case CHR_HDR:
 360                         seq_printf(f,"Character devices:\n");
 361                         /* fallthrough */
 362                 case CHR_LIST:
 363                         if (!get_chrdev_info(info->chrdev,&major,&name))
 364                                 seq_printf(f,"%3d %s\n",major,name);
 365                         break;
 366                 case BLK_HDR:
 367                         seq_printf(f,"\nBlock devices:\n");
 368                         /* fallthrough */
 369                 case BLK_LIST:
 370                         if (!get_blkdev_info(info->blkdev,&major,&name))
 371                                 seq_printf(f,"%3d %s\n",major,name);
 372                         break;
 373                 default:
 374                         break;
 375         }
 376
 377         return 0;
 378 }
 379
 380 static  struct seq_operations devinfo_op = {
 381         .start  = devinfo_start,
 382         .next   = devinfo_next,
 383         .stop   = devinfo_stop,
 384         .show   = devinfo_show,
 385 };
 386
 387 static int devinfo_open(struct inode *inode, struct file *file)
 388 {
 389         return seq_open(file, &devinfo_op);
 390 }
 391
 392 static struct file_operations proc_devinfo_operations = {
 393         .open           = devinfo_open,
 394         .read           = seq_read,
 395         .llseek         = seq_lseek,
 396         .release        = seq_release,
 397 };
 398
 399 static struct file_operations proc_cpuinfo_operations = {
 400         .open           = cpuinfo_open,
 401         .read           = seq_read,
 402         .llseek         = seq_lseek,
 403         .release        = seq_release,
 404 };
 405
 406 extern struct seq_operations vmstat_op;
 407 static int vmstat_open(struct inode *inode, struct file *file)
 408 {
 409         return seq_open(file, &vmstat_op);
 410 }
 411 static struct file_operations proc_vmstat_file_operations = {
 412         .open           = vmstat_open,
 413         .read           = seq_read,
 414         .llseek         = seq_lseek,
 415         .release        = seq_release,
 416 };
 417
 418 #ifdef CONFIG_PROC_HARDWARE
 419 static int hardware_read_proc(char *page, char **start, off_t off,
 420                                  int count, int *eof, void *data)
 421 {
 422         int len = get_hardware_list(page);
 423         return proc_calc_metrics(page, start, off, count, eof, len);
 424 }
 425 #endif
 426
 427 #ifdef CONFIG_STRAM_PROC
 428 static int stram_read_proc(char *page, char **start, off_t off,
 429                                  int count, int *eof, void *data)
 430 {
 431         int len = get_stram_list(page);
 432         return proc_calc_metrics(page, start, off, count, eof, len);
 433 }
 434 #endif
 435
 436 extern struct seq_operations partitions_op;
 437 static int partitions_open(struct inode *inode, struct file *file)
 438 {
 439         return seq_open(file, &partitions_op);
 440 }
 441 static struct file_operations proc_partitions_operations = {
 442         .open           = partitions_open,
 443         .read           = seq_read,
 444         .llseek         = seq_lseek,
 445         .release        = seq_release,
 446 };
 447
 448 extern struct seq_operations diskstats_op;
 449 static int diskstats_open(struct inode *inode, struct file *file)
 450 {
 451         return seq_open(file, &diskstats_op);
 452 }
 453 static struct file_operations proc_diskstats_operations = {
 454         .open           = diskstats_open,
 455         .read           = seq_read,
 456         .llseek         = seq_lseek,
 457         .release        = seq_release,
 458 };
 459
 460 #ifdef CONFIG_MODULES
 461 extern struct seq_operations modules_op;
 462 static int modules_open(struct inode *inode, struct file *file)
 463 {
 464         return seq_open(file, &modules_op);
 465 }
 466 static struct file_operations proc_modules_operations = {
 467         .open           = modules_open,
 468         .read           = seq_read,
 469         .llseek         = seq_lseek,
 470         .release        = seq_release,
 471 };
 472 #endif
 473
 474 #ifdef CONFIG_SLAB
 475 extern struct seq_operations slabinfo_op;
 476 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 477 static int slabinfo_open(struct inode *inode, struct file *file)
 478 {
 479         return seq_open(file, &slabinfo_op);
 480 }
 481 static struct file_operations proc_slabinfo_operations = {
 482         .open           = slabinfo_open,
 483         .read           = seq_read,
 484         .write          = slabinfo_write,
 485         .llseek         = seq_lseek,
 486         .release        = seq_release,
 487 };
 488
 489 #ifdef CONFIG_DEBUG_SLAB_LEAK
 490 extern struct seq_operations slabstats_op;
 491 static int slabstats_open(struct inode *inode, struct file *file)
 492 {
 493         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 494         int ret = -ENOMEM;
 495         if (n) {
 496                 ret = seq_open(file, &slabstats_op);
 497                 if (!ret) {
 498                         struct seq_file *m = file->private_data;
 499                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 500                         m->private = n;
 501                         n = NULL;
 502                 }
 503                 kfree(n);
 504         }
 505         return ret;
 506 }
 507
 508 static int slabstats_release(struct inode *inode, struct file *file)
 509 {
 510         struct seq_file *m = file->private_data;
 511         kfree(m->private);
 512         return seq_release(inode, file);
 513 }
 514
 515 static struct file_operations proc_slabstats_operations = {
 516         .open           = slabstats_open,
 517         .read           = seq_read,
 518         .llseek         = seq_lseek,
 519         .release        = slabstats_release,
 520 };
 521 #endif
 522 #endif
 523
 524 static int show_stat(struct seq_file *p, void *v)
 525 {
 526         int i;
 527         unsigned long jif;
 528         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 529         u64 sum = 0;
 530
 531         user = nice = system = idle = iowait =
 532                 irq = softirq = steal = cputime64_zero;
 533         jif = - wall_to_monotonic.tv_sec;
 534         if (wall_to_monotonic.tv_nsec)
 535                 --jif;
 536
 537         for_each_possible_cpu(i) {
 538                 int j;
 539
 540                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 541                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 542                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 543                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 544                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 545                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 546                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 547                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 548                 for (j = 0 ; j < NR_IRQS ; j++)
 549                         sum += kstat_cpu(i).irqs[j];
 550         }
 551
 552         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 553                 (unsigned long long)cputime64_to_clock_t(user),
 554                 (unsigned long long)cputime64_to_clock_t(nice),
 555                 (unsigned long long)cputime64_to_clock_t(system),
 556                 (unsigned long long)cputime64_to_clock_t(idle),
 557                 (unsigned long long)cputime64_to_clock_t(iowait),
 558                 (unsigned long long)cputime64_to_clock_t(irq),
 559                 (unsigned long long)cputime64_to_clock_t(softirq),
 560                 (unsigned long long)cputime64_to_clock_t(steal));
 561         for_each_online_cpu(i) {
 562
 563                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 564                 user = kstat_cpu(i).cpustat.user;
 565                 nice = kstat_cpu(i).cpustat.nice;
 566                 system = kstat_cpu(i).cpustat.system;
 567                 idle = kstat_cpu(i).cpustat.idle;
 568                 iowait = kstat_cpu(i).cpustat.iowait;
 569                 irq = kstat_cpu(i).cpustat.irq;
 570                 softirq = kstat_cpu(i).cpustat.softirq;
 571                 steal = kstat_cpu(i).cpustat.steal;
 572                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 573                         i,
 574                         (unsigned long long)cputime64_to_clock_t(user),
 575                         (unsigned long long)cputime64_to_clock_t(nice),
 576                         (unsigned long long)cputime64_to_clock_t(system),
 577                         (unsigned long long)cputime64_to_clock_t(idle),
 578                         (unsigned long long)cputime64_to_clock_t(iowait),
 579                         (unsigned long long)cputime64_to_clock_t(irq),
 580                         (unsigned long long)cputime64_to_clock_t(softirq),
 581                         (unsigned long long)cputime64_to_clock_t(steal));
 582         }
 583         seq_printf(p, "intr %llu", (unsigned long long)sum);
 584
 585 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
 586         for (i = 0; i < NR_IRQS; i++)
 587                 seq_printf(p, " %u", kstat_irqs(i));
 588 #endif
 589
 590         seq_printf(p,
 591                 "\nctxt %llu\n"
 592                 "btime %lu\n"
 593                 "processes %lu\n"
 594                 "procs_running %lu\n"
 595                 "procs_blocked %lu\n",
 596                 nr_context_switches(),
 597                 (unsigned long)jif,
 598                 total_forks,
 599                 nr_running(),
 600                 nr_iowait());
 601
 602         return 0;
 603 }
 604
 605 static int stat_open(struct inode *inode, struct file *file)
 606 {
 607         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 608         char *buf;
 609         struct seq_file *m;
 610         int res;
 611
 612         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 613         if (size > 128 * 1024)
 614                 size = 128 * 1024;
 615         buf = kmalloc(size, GFP_KERNEL);
 616         if (!buf)
 617                 return -ENOMEM;
 618
 619         res = single_open(file, show_stat, NULL);
 620         if (!res) {
 621                 m = file->private_data;
 622                 m->buf = buf;
 623                 m->size = size;
 624         } else
 625                 kfree(buf);
 626         return res;
 627 }
 628 static struct file_operations proc_stat_operations = {
 629         .open           = stat_open,
 630         .read           = seq_read,
 631         .llseek         = seq_lseek,
 632         .release        = single_release,
 633 };
 634
 635 /*
 636  * /proc/interrupts
 637  */
 638 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 639 {
 640         return (*pos <= NR_IRQS) ? pos : NULL;
 641 }
 642
 643 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 644 {
 645         (*pos)++;
 646         if (*pos > NR_IRQS)
 647                 return NULL;
 648         return pos;
 649 }
 650
 651 static void int_seq_stop(struct seq_file *f, void *v)
 652 {
 653         /* Nothing to do */
 654 }
 655
 656
 657 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 658 static struct seq_operations int_seq_ops = {
 659         .start = int_seq_start,
 660         .next  = int_seq_next,
 661         .stop  = int_seq_stop,
 662         .show  = show_interrupts
 663 };
 664
 665 static int interrupts_open(struct inode *inode, struct file *filp)
 666 {
 667         return seq_open(filp, &int_seq_ops);
 668 }
 669
 670 static struct file_operations proc_interrupts_operations = {
 671         .open           = interrupts_open,
 672         .read           = seq_read,
 673         .llseek         = seq_lseek,
 674         .release        = seq_release,
 675 };
 676
 677 static int filesystems_read_proc(char *page, char **start, off_t off,
 678                                  int count, int *eof, void *data)
 679 {
 680         int len = get_filesystem_list(page);
 681         return proc_calc_metrics(page, start, off, count, eof, len);
 682 }
 683
 684 static int cmdline_read_proc(char *page, char **start, off_t off,
 685                                  int count, int *eof, void *data)
 686 {
 687         int len;
 688
 689         len = sprintf(page, "%s\n", saved_command_line);
 690         return proc_calc_metrics(page, start, off, count, eof, len);
 691 }
 692
 693 static int locks_read_proc(char *page, char **start, off_t off,
 694                                  int count, int *eof, void *data)
 695 {
 696         int len = get_locks_status(page, start, off, count);
 697
 698         if (len < count)
 699                 *eof = 1;
 700         return len;
 701 }
 702
 703 static int execdomains_read_proc(char *page, char **start, off_t off,
 704                                  int count, int *eof, void *data)
 705 {
 706         int len = get_exec_domain_list(page);
 707         return proc_calc_metrics(page, start, off, count, eof, len);
 708 }
 709
 710 #ifdef CONFIG_MAGIC_SYSRQ
 711 /*
 712  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 713  */
 714 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 715                                    size_t count, loff_t *ppos)
 716 {
 717         if (count) {
 718                 char c;
 719
 720                 if (get_user(c, buf))
 721                         return -EFAULT;
 722                 __handle_sysrq(c, NULL, NULL, 0);
 723         }
 724         return count;
 725 }
 726
 727 static struct file_operations proc_sysrq_trigger_operations = {
 728         .write          = write_sysrq_trigger,
 729 };
 730 #endif
 731
 732 struct proc_dir_entry *proc_root_kcore;
 733
 734 void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
 735 {
 736         struct proc_dir_entry *entry;
 737         entry = create_proc_entry(name, mode, NULL);
 738         if (entry)
 739                 entry->proc_fops = f;
 740 }
 741
 742 void __init proc_misc_init(void)
 743 {
 744         struct proc_dir_entry *entry;
 745         static struct {
 746                 char *name;
 747                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 748         } *p, simple_ones[] = {
 749                 {"loadavg",     loadavg_read_proc},
 750                 {"uptime",      uptime_read_proc},
 751                 {"meminfo",     meminfo_read_proc},
 752                 {"version",     version_read_proc},
 753 #ifdef CONFIG_PROC_HARDWARE
 754                 {"hardware",    hardware_read_proc},
 755 #endif
 756 #ifdef CONFIG_STRAM_PROC
 757                 {"stram",       stram_read_proc},
 758 #endif
 759                 {"filesystems", filesystems_read_proc},
 760                 {"cmdline",     cmdline_read_proc},
 761                 {"locks",       locks_read_proc},
 762                 {"execdomains", execdomains_read_proc},
 763                 {NULL,}
 764         };
 765         for (p = simple_ones; p->name; p++)
 766                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 767
 768         proc_symlink("mounts", NULL, "self/mounts");
 769
 770         /* And now for trickier ones */
 771         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 772         if (entry)
 773                 entry->proc_fops = &proc_kmsg_operations;
 774         create_seq_entry("devices", 0, &proc_devinfo_operations);
 775         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 776         create_seq_entry("partitions", 0, &proc_partitions_operations);
 777         create_seq_entry("stat", 0, &proc_stat_operations);
 778         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 779 #ifdef CONFIG_SLAB
 780         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 781 #ifdef CONFIG_DEBUG_SLAB_LEAK
 782         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 783 #endif
 784 #endif
 785         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 786         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 787         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
 788         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 789 #ifdef CONFIG_MODULES
 790         create_seq_entry("modules", 0, &proc_modules_operations);
 791 #endif
 792 #ifdef CONFIG_SCHEDSTATS
 793         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 794 #endif
 795 #ifdef CONFIG_PROC_KCORE
 796         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 797         if (proc_root_kcore) {
 798                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 799                 proc_root_kcore->size =
 800                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 801         }
 802 #endif
 803 #ifdef CONFIG_PROC_VMCORE
 804         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
 805         if (proc_vmcore)
 806                 proc_vmcore->proc_fops = &proc_vmcore_operations;
 807 #endif
 808 #ifdef CONFIG_MAGIC_SYSRQ
 809         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 810         if (entry)
 811                 entry->proc_fops = &proc_sysrq_trigger_operations;
 812 #endif
 813 }