git.oblomov.eu Git - linux-2.6/blob - fs/proc/proc_misc.c

   1 /*
   2  *  linux/fs/proc/proc_misc.c
   3  *
   4  *  linux/fs/proc/array.c
   5  *  Copyright (C) 1992  by Linus Torvalds
   6  *  based on ideas by Darren Senn
   7  *
   8  *  This used to be the part of array.c. See the rest of history and credits
   9  *  there. I took this into a separate file and switched the thing to generic
  10  *  proc_file_inode_operations, leaving in array.c only per-process stuff.
  11  *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
  12  *
  13  * Changes:
  14  * Fulton Green      :  Encapsulated position metric calculations.
  15  *                      <kernel@FultonGreen.com>
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/time.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/fs.h>
  24 #include <linux/tty.h>
  25 #include <linux/string.h>
  26 #include <linux/mman.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/ioport.h>
  29 #include <linux/mm.h>
  30 #include <linux/mmzone.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/swap.h>
  33 #include <linux/slab.h>
  34 #include <linux/smp.h>
  35 #include <linux/signal.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/times.h>
  40 #include <linux/profile.h>
  41 #include <linux/utsname.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/hugetlb.h>
  44 #include <linux/jiffies.h>
  45 #include <linux/sysrq.h>
  46 #include <linux/vmalloc.h>
  47 #include <linux/crash_dump.h>
  48 #include <linux/pid_namespace.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
  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 static int loadavg_read_proc(char *page, char **start, off_t off,
  82                                  int count, int *eof, void *data)
  83 {
  84         int a, b, c;
  85         int len;
  86
  87         a = avenrun[0] + (FIXED_1/200);
  88         b = avenrun[1] + (FIXED_1/200);
  89         c = avenrun[2] + (FIXED_1/200);
  90         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  91                 LOAD_INT(a), LOAD_FRAC(a),
  92                 LOAD_INT(b), LOAD_FRAC(b),
  93                 LOAD_INT(c), LOAD_FRAC(c),
  94                 nr_running(), nr_threads, current->nsproxy->pid_ns->last_pid);
  95         return proc_calc_metrics(page, start, off, count, eof, len);
  96 }
  97
  98 static int uptime_read_proc(char *page, char **start, off_t off,
  99                                  int count, int *eof, void *data)
 100 {
 101         struct timespec uptime;
 102         struct timespec idle;
 103         int len;
 104         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 105
 106         do_posix_clock_monotonic_gettime(&uptime);
 107         monotonic_to_bootbased(&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         unsigned long committed;
 124         unsigned long allowed;
 125         struct vmalloc_info vmi;
 126         long cached;
 127
 128 /*
 129  * display in kilobytes.
 130  */
 131 #define K(x) ((x) << (PAGE_SHIFT - 10))
 132         si_meminfo(&i);
 133         si_swapinfo(&i);
 134         committed = atomic_read(&vm_committed_space);
 135         allowed = ((totalram_pages - hugetlb_total_pages())
 136                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 137
 138         cached = global_page_state(NR_FILE_PAGES) -
 139                         total_swapcache_pages - i.bufferram;
 140         if (cached < 0)
 141                 cached = 0;
 142
 143         get_vmalloc_info(&vmi);
 144
 145         /*
 146          * Tagged format, for easy grepping and expansion.
 147          */
 148         len = sprintf(page,
 149                 "MemTotal:     %8lu kB\n"
 150                 "MemFree:      %8lu kB\n"
 151                 "Buffers:      %8lu kB\n"
 152                 "Cached:       %8lu kB\n"
 153                 "SwapCached:   %8lu kB\n"
 154                 "Active:       %8lu kB\n"
 155                 "Inactive:     %8lu kB\n"
 156 #ifdef CONFIG_HIGHMEM
 157                 "HighTotal:    %8lu kB\n"
 158                 "HighFree:     %8lu kB\n"
 159                 "LowTotal:     %8lu kB\n"
 160                 "LowFree:      %8lu kB\n"
 161 #endif
 162                 "SwapTotal:    %8lu kB\n"
 163                 "SwapFree:     %8lu kB\n"
 164                 "Dirty:        %8lu kB\n"
 165                 "Writeback:    %8lu kB\n"
 166                 "AnonPages:    %8lu kB\n"
 167                 "Mapped:       %8lu kB\n"
 168                 "Slab:         %8lu kB\n"
 169                 "SReclaimable: %8lu kB\n"
 170                 "SUnreclaim:   %8lu kB\n"
 171                 "PageTables:   %8lu kB\n"
 172                 "NFS_Unstable: %8lu kB\n"
 173                 "Bounce:       %8lu kB\n"
 174                 "CommitLimit:  %8lu kB\n"
 175                 "Committed_AS: %8lu kB\n"
 176                 "VmallocTotal: %8lu kB\n"
 177                 "VmallocUsed:  %8lu kB\n"
 178                 "VmallocChunk: %8lu kB\n",
 179                 K(i.totalram),
 180                 K(i.freeram),
 181                 K(i.bufferram),
 182                 K(cached),
 183                 K(total_swapcache_pages),
 184                 K(global_page_state(NR_ACTIVE)),
 185                 K(global_page_state(NR_INACTIVE)),
 186 #ifdef CONFIG_HIGHMEM
 187                 K(i.totalhigh),
 188                 K(i.freehigh),
 189                 K(i.totalram-i.totalhigh),
 190                 K(i.freeram-i.freehigh),
 191 #endif
 192                 K(i.totalswap),
 193                 K(i.freeswap),
 194                 K(global_page_state(NR_FILE_DIRTY)),
 195                 K(global_page_state(NR_WRITEBACK)),
 196                 K(global_page_state(NR_ANON_PAGES)),
 197                 K(global_page_state(NR_FILE_MAPPED)),
 198                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 199                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 200                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 201                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 202                 K(global_page_state(NR_PAGETABLE)),
 203                 K(global_page_state(NR_UNSTABLE_NFS)),
 204                 K(global_page_state(NR_BOUNCE)),
 205                 K(allowed),
 206                 K(committed),
 207                 (unsigned long)VMALLOC_TOTAL >> 10,
 208                 vmi.used >> 10,
 209                 vmi.largest_chunk >> 10
 210                 );
 211
 212                 len += hugetlb_report_meminfo(page + len);
 213
 214         return proc_calc_metrics(page, start, off, count, eof, len);
 215 #undef K
 216 }
 217
 218 extern struct seq_operations fragmentation_op;
 219 static int fragmentation_open(struct inode *inode, struct file *file)
 220 {
 221         (void)inode;
 222         return seq_open(file, &fragmentation_op);
 223 }
 224
 225 static const struct file_operations fragmentation_file_operations = {
 226         .open           = fragmentation_open,
 227         .read           = seq_read,
 228         .llseek         = seq_lseek,
 229         .release        = seq_release,
 230 };
 231
 232 extern struct seq_operations pagetypeinfo_op;
 233 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 234 {
 235         return seq_open(file, &pagetypeinfo_op);
 236 }
 237
 238 static const struct file_operations pagetypeinfo_file_ops = {
 239         .open           = pagetypeinfo_open,
 240         .read           = seq_read,
 241         .llseek         = seq_lseek,
 242         .release        = seq_release,
 243 };
 244
 245 extern struct seq_operations zoneinfo_op;
 246 static int zoneinfo_open(struct inode *inode, struct file *file)
 247 {
 248         return seq_open(file, &zoneinfo_op);
 249 }
 250
 251 static const struct file_operations proc_zoneinfo_file_operations = {
 252         .open           = zoneinfo_open,
 253         .read           = seq_read,
 254         .llseek         = seq_lseek,
 255         .release        = seq_release,
 256 };
 257
 258 static int version_read_proc(char *page, char **start, off_t off,
 259                                  int count, int *eof, void *data)
 260 {
 261         int len;
 262
 263         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 264                 utsname()->sysname,
 265                 utsname()->release,
 266                 utsname()->version);
 267         return proc_calc_metrics(page, start, off, count, eof, len);
 268 }
 269
 270 extern struct seq_operations cpuinfo_op;
 271 static int cpuinfo_open(struct inode *inode, struct file *file)
 272 {
 273         return seq_open(file, &cpuinfo_op);
 274 }
 275
 276 static const struct file_operations proc_cpuinfo_operations = {
 277         .open           = cpuinfo_open,
 278         .read           = seq_read,
 279         .llseek         = seq_lseek,
 280         .release        = seq_release,
 281 };
 282
 283 static int devinfo_show(struct seq_file *f, void *v)
 284 {
 285         int i = *(loff_t *) v;
 286
 287         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 288                 if (i == 0)
 289                         seq_printf(f, "Character devices:\n");
 290                 chrdev_show(f, i);
 291         }
 292 #ifdef CONFIG_BLOCK
 293         else {
 294                 i -= CHRDEV_MAJOR_HASH_SIZE;
 295                 if (i == 0)
 296                         seq_printf(f, "\nBlock devices:\n");
 297                 blkdev_show(f, i);
 298         }
 299 #endif
 300         return 0;
 301 }
 302
 303 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 304 {
 305         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 306                 return pos;
 307         return NULL;
 308 }
 309
 310 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 311 {
 312         (*pos)++;
 313         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 314                 return NULL;
 315         return pos;
 316 }
 317
 318 static void devinfo_stop(struct seq_file *f, void *v)
 319 {
 320         /* Nothing to do */
 321 }
 322
 323 static struct seq_operations devinfo_ops = {
 324         .start = devinfo_start,
 325         .next  = devinfo_next,
 326         .stop  = devinfo_stop,
 327         .show  = devinfo_show
 328 };
 329
 330 static int devinfo_open(struct inode *inode, struct file *filp)
 331 {
 332         return seq_open(filp, &devinfo_ops);
 333 }
 334
 335 static const struct file_operations proc_devinfo_operations = {
 336         .open           = devinfo_open,
 337         .read           = seq_read,
 338         .llseek         = seq_lseek,
 339         .release        = seq_release,
 340 };
 341
 342 extern struct seq_operations vmstat_op;
 343 static int vmstat_open(struct inode *inode, struct file *file)
 344 {
 345         return seq_open(file, &vmstat_op);
 346 }
 347 static const struct file_operations proc_vmstat_file_operations = {
 348         .open           = vmstat_open,
 349         .read           = seq_read,
 350         .llseek         = seq_lseek,
 351         .release        = seq_release,
 352 };
 353
 354 #ifdef CONFIG_PROC_HARDWARE
 355 static int hardware_read_proc(char *page, char **start, off_t off,
 356                                  int count, int *eof, void *data)
 357 {
 358         int len = get_hardware_list(page);
 359         return proc_calc_metrics(page, start, off, count, eof, len);
 360 }
 361 #endif
 362
 363 #ifdef CONFIG_STRAM_PROC
 364 static int stram_read_proc(char *page, char **start, off_t off,
 365                                  int count, int *eof, void *data)
 366 {
 367         int len = get_stram_list(page);
 368         return proc_calc_metrics(page, start, off, count, eof, len);
 369 }
 370 #endif
 371
 372 #ifdef CONFIG_BLOCK
 373 extern struct seq_operations partitions_op;
 374 static int partitions_open(struct inode *inode, struct file *file)
 375 {
 376         return seq_open(file, &partitions_op);
 377 }
 378 static const struct file_operations proc_partitions_operations = {
 379         .open           = partitions_open,
 380         .read           = seq_read,
 381         .llseek         = seq_lseek,
 382         .release        = seq_release,
 383 };
 384
 385 extern struct seq_operations diskstats_op;
 386 static int diskstats_open(struct inode *inode, struct file *file)
 387 {
 388         return seq_open(file, &diskstats_op);
 389 }
 390 static const struct file_operations proc_diskstats_operations = {
 391         .open           = diskstats_open,
 392         .read           = seq_read,
 393         .llseek         = seq_lseek,
 394         .release        = seq_release,
 395 };
 396 #endif
 397
 398 #ifdef CONFIG_MODULES
 399 extern struct seq_operations modules_op;
 400 static int modules_open(struct inode *inode, struct file *file)
 401 {
 402         return seq_open(file, &modules_op);
 403 }
 404 static const struct file_operations proc_modules_operations = {
 405         .open           = modules_open,
 406         .read           = seq_read,
 407         .llseek         = seq_lseek,
 408         .release        = seq_release,
 409 };
 410 #endif
 411
 412 #ifdef CONFIG_SLAB
 413 static int slabinfo_open(struct inode *inode, struct file *file)
 414 {
 415         return seq_open(file, &slabinfo_op);
 416 }
 417 static const struct file_operations proc_slabinfo_operations = {
 418         .open           = slabinfo_open,
 419         .read           = seq_read,
 420         .write          = slabinfo_write,
 421         .llseek         = seq_lseek,
 422         .release        = seq_release,
 423 };
 424
 425 #ifdef CONFIG_DEBUG_SLAB_LEAK
 426 extern struct seq_operations slabstats_op;
 427 static int slabstats_open(struct inode *inode, struct file *file)
 428 {
 429         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 430         int ret = -ENOMEM;
 431         if (n) {
 432                 ret = seq_open(file, &slabstats_op);
 433                 if (!ret) {
 434                         struct seq_file *m = file->private_data;
 435                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 436                         m->private = n;
 437                         n = NULL;
 438                 }
 439                 kfree(n);
 440         }
 441         return ret;
 442 }
 443
 444 static const struct file_operations proc_slabstats_operations = {
 445         .open           = slabstats_open,
 446         .read           = seq_read,
 447         .llseek         = seq_lseek,
 448         .release        = seq_release_private,
 449 };
 450 #endif
 451 #endif
 452
 453 static int show_stat(struct seq_file *p, void *v)
 454 {
 455         int i;
 456         unsigned long jif;
 457         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 458         cputime64_t guest;
 459         u64 sum = 0;
 460         struct timespec boottime;
 461         unsigned int *per_irq_sum;
 462
 463         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 464         if (!per_irq_sum)
 465                 return -ENOMEM;
 466
 467         user = nice = system = idle = iowait =
 468                 irq = softirq = steal = cputime64_zero;
 469         guest = cputime64_zero;
 470         getboottime(&boottime);
 471         jif = boottime.tv_sec;
 472
 473         for_each_possible_cpu(i) {
 474                 int j;
 475
 476                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 477                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 478                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 479                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 480                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 481                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 482                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 483                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 484                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 485                 for (j = 0; j < NR_IRQS; j++) {
 486                         unsigned int temp = kstat_cpu(i).irqs[j];
 487                         sum += temp;
 488                         per_irq_sum[j] += temp;
 489                 }
 490         }
 491
 492         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 493                 (unsigned long long)cputime64_to_clock_t(user),
 494                 (unsigned long long)cputime64_to_clock_t(nice),
 495                 (unsigned long long)cputime64_to_clock_t(system),
 496                 (unsigned long long)cputime64_to_clock_t(idle),
 497                 (unsigned long long)cputime64_to_clock_t(iowait),
 498                 (unsigned long long)cputime64_to_clock_t(irq),
 499                 (unsigned long long)cputime64_to_clock_t(softirq),
 500                 (unsigned long long)cputime64_to_clock_t(steal),
 501                 (unsigned long long)cputime64_to_clock_t(guest));
 502         for_each_online_cpu(i) {
 503
 504                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 505                 user = kstat_cpu(i).cpustat.user;
 506                 nice = kstat_cpu(i).cpustat.nice;
 507                 system = kstat_cpu(i).cpustat.system;
 508                 idle = kstat_cpu(i).cpustat.idle;
 509                 iowait = kstat_cpu(i).cpustat.iowait;
 510                 irq = kstat_cpu(i).cpustat.irq;
 511                 softirq = kstat_cpu(i).cpustat.softirq;
 512                 steal = kstat_cpu(i).cpustat.steal;
 513                 guest = kstat_cpu(i).cpustat.guest;
 514                 seq_printf(p,
 515                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 516                         i,
 517                         (unsigned long long)cputime64_to_clock_t(user),
 518                         (unsigned long long)cputime64_to_clock_t(nice),
 519                         (unsigned long long)cputime64_to_clock_t(system),
 520                         (unsigned long long)cputime64_to_clock_t(idle),
 521                         (unsigned long long)cputime64_to_clock_t(iowait),
 522                         (unsigned long long)cputime64_to_clock_t(irq),
 523                         (unsigned long long)cputime64_to_clock_t(softirq),
 524                         (unsigned long long)cputime64_to_clock_t(steal),
 525                         (unsigned long long)cputime64_to_clock_t(guest));
 526         }
 527         seq_printf(p, "intr %llu", (unsigned long long)sum);
 528
 529 #ifndef CONFIG_SMP
 530         /* Touches too many cache lines on SMP setups */
 531         for (i = 0; i < NR_IRQS; i++)
 532                 seq_printf(p, " %u", per_irq_sum[i]);
 533 #endif
 534
 535         seq_printf(p,
 536                 "\nctxt %llu\n"
 537                 "btime %lu\n"
 538                 "processes %lu\n"
 539                 "procs_running %lu\n"
 540                 "procs_blocked %lu\n",
 541                 nr_context_switches(),
 542                 (unsigned long)jif,
 543                 total_forks,
 544                 nr_running(),
 545                 nr_iowait());
 546
 547         kfree(per_irq_sum);
 548         return 0;
 549 }
 550
 551 static int stat_open(struct inode *inode, struct file *file)
 552 {
 553         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 554         char *buf;
 555         struct seq_file *m;
 556         int res;
 557
 558         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 559         if (size > 128 * 1024)
 560                 size = 128 * 1024;
 561         buf = kmalloc(size, GFP_KERNEL);
 562         if (!buf)
 563                 return -ENOMEM;
 564
 565         res = single_open(file, show_stat, NULL);
 566         if (!res) {
 567                 m = file->private_data;
 568                 m->buf = buf;
 569                 m->size = size;
 570         } else
 571                 kfree(buf);
 572         return res;
 573 }
 574 static const struct file_operations proc_stat_operations = {
 575         .open           = stat_open,
 576         .read           = seq_read,
 577         .llseek         = seq_lseek,
 578         .release        = single_release,
 579 };
 580
 581 /*
 582  * /proc/interrupts
 583  */
 584 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 585 {
 586         return (*pos <= NR_IRQS) ? pos : NULL;
 587 }
 588
 589 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 590 {
 591         (*pos)++;
 592         if (*pos > NR_IRQS)
 593                 return NULL;
 594         return pos;
 595 }
 596
 597 static void int_seq_stop(struct seq_file *f, void *v)
 598 {
 599         /* Nothing to do */
 600 }
 601
 602
 603 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 604 static struct seq_operations int_seq_ops = {
 605         .start = int_seq_start,
 606         .next  = int_seq_next,
 607         .stop  = int_seq_stop,
 608         .show  = show_interrupts
 609 };
 610
 611 static int interrupts_open(struct inode *inode, struct file *filp)
 612 {
 613         return seq_open(filp, &int_seq_ops);
 614 }
 615
 616 static const struct file_operations proc_interrupts_operations = {
 617         .open           = interrupts_open,
 618         .read           = seq_read,
 619         .llseek         = seq_lseek,
 620         .release        = seq_release,
 621 };
 622
 623 static int filesystems_read_proc(char *page, char **start, off_t off,
 624                                  int count, int *eof, void *data)
 625 {
 626         int len = get_filesystem_list(page);
 627         return proc_calc_metrics(page, start, off, count, eof, len);
 628 }
 629
 630 static int cmdline_read_proc(char *page, char **start, off_t off,
 631                                  int count, int *eof, void *data)
 632 {
 633         int len;
 634
 635         len = sprintf(page, "%s\n", saved_command_line);
 636         return proc_calc_metrics(page, start, off, count, eof, len);
 637 }
 638
 639 static int locks_open(struct inode *inode, struct file *filp)
 640 {
 641         return seq_open(filp, &locks_seq_operations);
 642 }
 643
 644 static const struct file_operations proc_locks_operations = {
 645         .open           = locks_open,
 646         .read           = seq_read,
 647         .llseek         = seq_lseek,
 648         .release        = seq_release,
 649 };
 650
 651 static int execdomains_read_proc(char *page, char **start, off_t off,
 652                                  int count, int *eof, void *data)
 653 {
 654         int len = get_exec_domain_list(page);
 655         return proc_calc_metrics(page, start, off, count, eof, len);
 656 }
 657
 658 #ifdef CONFIG_MAGIC_SYSRQ
 659 /*
 660  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 661  */
 662 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 663                                    size_t count, loff_t *ppos)
 664 {
 665         if (count) {
 666                 char c;
 667
 668                 if (get_user(c, buf))
 669                         return -EFAULT;
 670                 __handle_sysrq(c, NULL, 0);
 671         }
 672         return count;
 673 }
 674
 675 static const struct file_operations proc_sysrq_trigger_operations = {
 676         .write          = write_sysrq_trigger,
 677 };
 678 #endif
 679
 680 struct proc_dir_entry *proc_root_kcore;
 681
 682 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 683 {
 684         struct proc_dir_entry *entry;
 685         entry = create_proc_entry(name, mode, NULL);
 686         if (entry)
 687                 entry->proc_fops = f;
 688 }
 689
 690 void __init proc_misc_init(void)
 691 {
 692         static struct {
 693                 char *name;
 694                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 695         } *p, simple_ones[] = {
 696                 {"loadavg",     loadavg_read_proc},
 697                 {"uptime",      uptime_read_proc},
 698                 {"meminfo",     meminfo_read_proc},
 699                 {"version",     version_read_proc},
 700 #ifdef CONFIG_PROC_HARDWARE
 701                 {"hardware",    hardware_read_proc},
 702 #endif
 703 #ifdef CONFIG_STRAM_PROC
 704                 {"stram",       stram_read_proc},
 705 #endif
 706                 {"filesystems", filesystems_read_proc},
 707                 {"cmdline",     cmdline_read_proc},
 708                 {"execdomains", execdomains_read_proc},
 709                 {NULL,}
 710         };
 711         for (p = simple_ones; p->name; p++)
 712                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 713
 714         proc_symlink("mounts", NULL, "self/mounts");
 715
 716         /* And now for trickier ones */
 717 #ifdef CONFIG_PRINTK
 718         {
 719                 struct proc_dir_entry *entry;
 720                 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 721                 if (entry)
 722                         entry->proc_fops = &proc_kmsg_operations;
 723         }
 724 #endif
 725         create_seq_entry("locks", 0, &proc_locks_operations);
 726         create_seq_entry("devices", 0, &proc_devinfo_operations);
 727         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 728 #ifdef CONFIG_BLOCK
 729         create_seq_entry("partitions", 0, &proc_partitions_operations);
 730 #endif
 731         create_seq_entry("stat", 0, &proc_stat_operations);
 732         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 733 #ifdef CONFIG_SLAB
 734         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 735 #ifdef CONFIG_DEBUG_SLAB_LEAK
 736         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 737 #endif
 738 #endif
 739         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 740         create_seq_entry("pagetypeinfo", S_IRUGO, &pagetypeinfo_file_ops);
 741         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 742         create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
 743 #ifdef CONFIG_BLOCK
 744         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 745 #endif
 746 #ifdef CONFIG_MODULES
 747         create_seq_entry("modules", 0, &proc_modules_operations);
 748 #endif
 749 #ifdef CONFIG_SCHEDSTATS
 750         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 751 #endif
 752 #ifdef CONFIG_PROC_KCORE
 753         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 754         if (proc_root_kcore) {
 755                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 756                 proc_root_kcore->size =
 757                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 758         }
 759 #endif
 760 #ifdef CONFIG_PROC_VMCORE
 761         proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
 762         if (proc_vmcore)
 763                 proc_vmcore->proc_fops = &proc_vmcore_operations;
 764 #endif
 765 #ifdef CONFIG_MAGIC_SYSRQ
 766         {
 767                 struct proc_dir_entry *entry;
 768                 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 769                 if (entry)
 770                         entry->proc_fops = &proc_sysrq_trigger_operations;
 771         }
 772 #endif
 773 }