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/smp_lock.h>
  39 #include <linux/seq_file.h>
  40 #include <linux/times.h>
  41 #include <linux/profile.h>
  42 #include <linux/utsname.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 <linux/pid_namespace.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/pgtable.h>
  52 #include <asm/io.h>
  53 #include <asm/tlb.h>
  54 #include <asm/div64.h>
  55 #include "internal.h"
  56
  57 #include <linux/vs_cvirt.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_filesystem_list(char *);
  70 extern int get_exec_domain_list(char *);
  71 extern int get_dma_list(char *);
  72 extern int get_locks_status (char *, char **, off_t, int);
  73
  74 static int proc_calc_metrics(char *page, char **start, off_t off,
  75                                  int count, int *eof, int len)
  76 {
  77         if (len <= off+count) *eof = 1;
  78         *start = page + off;
  79         len -= off;
  80         if (len>count) len = count;
  81         if (len<0) len = 0;
  82         return len;
  83 }
  84
  85 static int loadavg_read_proc(char *page, char **start, off_t off,
  86                                  int count, int *eof, void *data)
  87 {
  88         unsigned int running, threads;
  89         int a, b, c;
  90         int len;
  91
  92         if (vx_flags(VXF_VIRT_LOAD, 0)) {
  93                 struct vx_info *vxi = current->vx_info;
  94
  95                 a = vxi->cvirt.load[0] + (FIXED_1/200);
  96                 b = vxi->cvirt.load[1] + (FIXED_1/200);
  97                 c = vxi->cvirt.load[2] + (FIXED_1/200);
  98
  99                 running = atomic_read(&vxi->cvirt.nr_running);
 100                 threads = atomic_read(&vxi->cvirt.nr_threads);
 101         } else {
 102                 a = avenrun[0] + (FIXED_1/200);
 103                 b = avenrun[1] + (FIXED_1/200);
 104                 c = avenrun[2] + (FIXED_1/200);
 105
 106                 running = nr_running();
 107                 threads = nr_threads;
 108         }
 109         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %d/%d %d\n",
 110                 LOAD_INT(a), LOAD_FRAC(a),
 111                 LOAD_INT(b), LOAD_FRAC(b),
 112                 LOAD_INT(c), LOAD_FRAC(c),
 113                 running, threads, current->nsproxy->pid_ns->last_pid);
 114         return proc_calc_metrics(page, start, off, count, eof, len);
 115 }
 116
 117 static int uptime_read_proc(char *page, char **start, off_t off,
 118                                  int count, int *eof, void *data)
 119 {
 120         struct timespec uptime;
 121         struct timespec idle;
 122         int len;
 123         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 124
 125         do_posix_clock_monotonic_gettime(&uptime);
 126         cputime_to_timespec(idletime, &idle);
 127         if (vx_flags(VXF_VIRT_UPTIME, 0))
 128                 vx_vsi_uptime(&uptime, &idle);
 129
 130         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 131                         (unsigned long) uptime.tv_sec,
 132                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 133                         (unsigned long) idle.tv_sec,
 134                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 135
 136         return proc_calc_metrics(page, start, off, count, eof, len);
 137 }
 138
 139 static int meminfo_read_proc(char *page, char **start, off_t off,
 140                                  int count, int *eof, void *data)
 141 {
 142         struct sysinfo i;
 143         int len;
 144         unsigned long inactive;
 145         unsigned long active;
 146         unsigned long free;
 147         unsigned long committed;
 148         unsigned long allowed;
 149         struct vmalloc_info vmi;
 150         long cached;
 151
 152         get_zone_counts(&active, &inactive, &free);
 153
 154 /*
 155  * display in kilobytes.
 156  */
 157 #define K(x) ((x) << (PAGE_SHIFT - 10))
 158         si_meminfo(&i);
 159         si_swapinfo(&i);
 160         committed = atomic_read(&vm_committed_space);
 161         allowed = ((totalram_pages - hugetlb_total_pages())
 162                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 163
 164         cached = global_page_state(NR_FILE_PAGES) -
 165                         total_swapcache_pages - i.bufferram;
 166         if (cached < 0 || vx_flags(VXF_VIRT_MEM, 0))
 167                 cached = 0;
 168
 169         get_vmalloc_info(&vmi);
 170
 171         /*
 172          * Tagged format, for easy grepping and expansion.
 173          */
 174         len = sprintf(page,
 175                 "MemTotal:     %8lu kB\n"
 176                 "MemFree:      %8lu kB\n"
 177                 "Buffers:      %8lu kB\n"
 178                 "Cached:       %8lu kB\n"
 179                 "SwapCached:   %8lu kB\n"
 180                 "Active:       %8lu kB\n"
 181                 "Inactive:     %8lu kB\n"
 182 #ifdef CONFIG_HIGHMEM
 183                 "HighTotal:    %8lu kB\n"
 184                 "HighFree:     %8lu kB\n"
 185                 "LowTotal:     %8lu kB\n"
 186                 "LowFree:      %8lu kB\n"
 187 #endif
 188                 "SwapTotal:    %8lu kB\n"
 189                 "SwapFree:     %8lu kB\n"
 190                 "Dirty:        %8lu kB\n"
 191                 "Writeback:    %8lu kB\n"
 192                 "AnonPages:    %8lu kB\n"
 193                 "Mapped:       %8lu kB\n"
 194                 "Slab:         %8lu kB\n"
 195                 "SReclaimable: %8lu kB\n"
 196                 "SUnreclaim:   %8lu kB\n"
 197                 "PageTables:   %8lu kB\n"
 198                 "NFS_Unstable: %8lu kB\n"
 199                 "Bounce:       %8lu kB\n"
 200                 "CommitLimit:  %8lu kB\n"
 201                 "Committed_AS: %8lu kB\n"
 202                 "VmallocTotal: %8lu kB\n"
 203                 "VmallocUsed:  %8lu kB\n"
 204                 "VmallocChunk: %8lu kB\n",
 205                 K(i.totalram),
 206                 K(i.freeram),
 207                 K(i.bufferram),
 208                 K(cached),
 209                 K(total_swapcache_pages),
 210                 K(active),
 211                 K(inactive),
 212 #ifdef CONFIG_HIGHMEM
 213                 K(i.totalhigh),
 214                 K(i.freehigh),
 215                 K(i.totalram-i.totalhigh),
 216                 K(i.freeram-i.freehigh),
 217 #endif
 218                 K(i.totalswap),
 219                 K(i.freeswap),
 220                 K(global_page_state(NR_FILE_DIRTY)),
 221                 K(global_page_state(NR_WRITEBACK)),
 222                 K(global_page_state(NR_ANON_PAGES)),
 223                 K(global_page_state(NR_FILE_MAPPED)),
 224                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 225                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 226                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 227                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 228                 K(global_page_state(NR_PAGETABLE)),
 229                 K(global_page_state(NR_UNSTABLE_NFS)),
 230                 K(global_page_state(NR_BOUNCE)),
 231                 K(allowed),
 232                 K(committed),
 233                 (unsigned long)VMALLOC_TOTAL >> 10,
 234                 vmi.used >> 10,
 235                 vmi.largest_chunk >> 10
 236                 );
 237
 238                 len += hugetlb_report_meminfo(page + len);
 239
 240         return proc_calc_metrics(page, start, off, count, eof, len);
 241 #undef K
 242 }
 243
 244 extern struct seq_operations fragmentation_op;
 245 static int fragmentation_open(struct inode *inode, struct file *file)
 246 {
 247         (void)inode;
 248         return seq_open(file, &fragmentation_op);
 249 }
 250
 251 static struct file_operations fragmentation_file_operations = {
 252         .open           = fragmentation_open,
 253         .read           = seq_read,
 254         .llseek         = seq_lseek,
 255         .release        = seq_release,
 256 };
 257
 258 extern struct seq_operations zoneinfo_op;
 259 static int zoneinfo_open(struct inode *inode, struct file *file)
 260 {
 261         return seq_open(file, &zoneinfo_op);
 262 }
 263
 264 static struct file_operations proc_zoneinfo_file_operations = {
 265         .open           = zoneinfo_open,
 266         .read           = seq_read,
 267         .llseek         = seq_lseek,
 268         .release        = seq_release,
 269 };
 270
 271 static int version_read_proc(char *page, char **start, off_t off,
 272                                  int count, int *eof, void *data)
 273 {
 274         int len;
 275
 276         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 277                 utsname()->sysname,
 278                 utsname()->release,
 279                 utsname()->version);
 280         return proc_calc_metrics(page, start, off, count, eof, len);
 281 }
 282
 283 extern struct seq_operations cpuinfo_op;
 284 static int cpuinfo_open(struct inode *inode, struct file *file)
 285 {
 286         return seq_open(file, &cpuinfo_op);
 287 }
 288
 289 static struct file_operations proc_cpuinfo_operations = {
 290         .open           = cpuinfo_open,
 291         .read           = seq_read,
 292         .llseek         = seq_lseek,
 293         .release        = seq_release,
 294 };
 295
 296 static int devinfo_show(struct seq_file *f, void *v)
 297 {
 298         int i = *(loff_t *) v;
 299
 300         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 301                 if (i == 0)
 302                         seq_printf(f, "Character devices:\n");
 303                 chrdev_show(f, i);
 304         }
 305 #ifdef CONFIG_BLOCK
 306         else {
 307                 i -= CHRDEV_MAJOR_HASH_SIZE;
 308                 if (i == 0)
 309                         seq_printf(f, "\nBlock devices:\n");
 310                 blkdev_show(f, i);
 311         }
 312 #endif
 313         return 0;
 314 }
 315
 316 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 317 {
 318         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 319                 return pos;
 320         return NULL;
 321 }
 322
 323 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 324 {
 325         (*pos)++;
 326         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 327                 return NULL;
 328         return pos;
 329 }
 330
 331 static void devinfo_stop(struct seq_file *f, void *v)
 332 {
 333         /* Nothing to do */
 334 }
 335
 336 static struct seq_operations devinfo_ops = {
 337         .start = devinfo_start,
 338         .next  = devinfo_next,
 339         .stop  = devinfo_stop,
 340         .show  = devinfo_show
 341 };
 342
 343 static int devinfo_open(struct inode *inode, struct file *filp)
 344 {
 345         return seq_open(filp, &devinfo_ops);
 346 }
 347
 348 static struct file_operations proc_devinfo_operations = {
 349         .open           = devinfo_open,
 350         .read           = seq_read,
 351         .llseek         = seq_lseek,
 352         .release        = seq_release,
 353 };
 354
 355 extern struct seq_operations vmstat_op;
 356 static int vmstat_open(struct inode *inode, struct file *file)
 357 {
 358         return seq_open(file, &vmstat_op);
 359 }
 360 static struct file_operations proc_vmstat_file_operations = {
 361         .open           = vmstat_open,
 362         .read           = seq_read,
 363         .llseek         = seq_lseek,
 364         .release        = seq_release,
 365 };
 366
 367 #ifdef CONFIG_PROC_HARDWARE
 368 static int hardware_read_proc(char *page, char **start, off_t off,
 369                                  int count, int *eof, void *data)
 370 {
 371         int len = get_hardware_list(page);
 372         return proc_calc_metrics(page, start, off, count, eof, len);
 373 }
 374 #endif
 375
 376 #ifdef CONFIG_STRAM_PROC
 377 static int stram_read_proc(char *page, char **start, off_t off,
 378                                  int count, int *eof, void *data)
 379 {
 380         int len = get_stram_list(page);
 381         return proc_calc_metrics(page, start, off, count, eof, len);
 382 }
 383 #endif
 384
 385 #ifdef CONFIG_BLOCK
 386 extern struct seq_operations partitions_op;
 387 static int partitions_open(struct inode *inode, struct file *file)
 388 {
 389         return seq_open(file, &partitions_op);
 390 }
 391 static struct file_operations proc_partitions_operations = {
 392         .open           = partitions_open,
 393         .read           = seq_read,
 394         .llseek         = seq_lseek,
 395         .release        = seq_release,
 396 };
 397
 398 extern struct seq_operations diskstats_op;
 399 static int diskstats_open(struct inode *inode, struct file *file)
 400 {
 401         return seq_open(file, &diskstats_op);
 402 }
 403 static struct file_operations proc_diskstats_operations = {
 404         .open           = diskstats_open,
 405         .read           = seq_read,
 406         .llseek         = seq_lseek,
 407         .release        = seq_release,
 408 };
 409 #endif
 410
 411 #ifdef CONFIG_MODULES
 412 extern struct seq_operations modules_op;
 413 static int modules_open(struct inode *inode, struct file *file)
 414 {
 415         return seq_open(file, &modules_op);
 416 }
 417 static struct file_operations proc_modules_operations = {
 418         .open           = modules_open,
 419         .read           = seq_read,
 420         .llseek         = seq_lseek,
 421         .release        = seq_release,
 422 };
 423 #endif
 424
 425 #ifdef CONFIG_SLAB
 426 extern struct seq_operations slabinfo_op;
 427 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 428 static int slabinfo_open(struct inode *inode, struct file *file)
 429 {
 430         return seq_open(file, &slabinfo_op);
 431 }
 432 static struct file_operations proc_slabinfo_operations = {
 433         .open           = slabinfo_open,
 434         .read           = seq_read,
 435         .write          = slabinfo_write,
 436         .llseek         = seq_lseek,
 437         .release        = seq_release,
 438 };
 439
 440 #ifdef CONFIG_DEBUG_SLAB_LEAK
 441 extern struct seq_operations slabstats_op;
 442 static int slabstats_open(struct inode *inode, struct file *file)
 443 {
 444         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 445         int ret = -ENOMEM;
 446         if (n) {
 447                 ret = seq_open(file, &slabstats_op);
 448                 if (!ret) {
 449                         struct seq_file *m = file->private_data;
 450                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 451                         m->private = n;
 452                         n = NULL;
 453                 }
 454                 kfree(n);
 455         }
 456         return ret;
 457 }
 458
 459 static int slabstats_release(struct inode *inode, struct file *file)
 460 {
 461         struct seq_file *m = file->private_data;
 462         kfree(m->private);
 463         return seq_release(inode, file);
 464 }
 465
 466 static struct file_operations proc_slabstats_operations = {
 467         .open           = slabstats_open,
 468         .read           = seq_read,
 469         .llseek         = seq_lseek,
 470         .release        = slabstats_release,
 471 };
 472 #endif
 473 #endif
 474
 475 static int show_stat(struct seq_file *p, void *v)
 476 {
 477         int i;
 478         unsigned long jif;
 479         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 480         u64 sum = 0;
 481
 482         user = nice = system = idle = iowait =
 483                 irq = softirq = steal = cputime64_zero;
 484         jif = - wall_to_monotonic.tv_sec;
 485         if (wall_to_monotonic.tv_nsec)
 486                 --jif;
 487
 488         for_each_possible_cpu(i) {
 489                 int j;
 490
 491                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 492                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 493                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 494                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 495                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 496                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 497                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 498                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 499                 for (j = 0 ; j < NR_IRQS ; j++)
 500                         sum += kstat_cpu(i).irqs[j];
 501         }
 502
 503         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 504                 (unsigned long long)cputime64_to_clock_t(user),
 505                 (unsigned long long)cputime64_to_clock_t(nice),
 506                 (unsigned long long)cputime64_to_clock_t(system),
 507                 (unsigned long long)cputime64_to_clock_t(idle),
 508                 (unsigned long long)cputime64_to_clock_t(iowait),
 509                 (unsigned long long)cputime64_to_clock_t(irq),
 510                 (unsigned long long)cputime64_to_clock_t(softirq),
 511                 (unsigned long long)cputime64_to_clock_t(steal));
 512         for_each_online_cpu(i) {
 513
 514                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 515                 user = kstat_cpu(i).cpustat.user;
 516                 nice = kstat_cpu(i).cpustat.nice;
 517                 system = kstat_cpu(i).cpustat.system;
 518                 idle = kstat_cpu(i).cpustat.idle;
 519                 iowait = kstat_cpu(i).cpustat.iowait;
 520                 irq = kstat_cpu(i).cpustat.irq;
 521                 softirq = kstat_cpu(i).cpustat.softirq;
 522                 steal = kstat_cpu(i).cpustat.steal;
 523                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 524                         i,
 525                         (unsigned long long)cputime64_to_clock_t(user),
 526                         (unsigned long long)cputime64_to_clock_t(nice),
 527                         (unsigned long long)cputime64_to_clock_t(system),
 528                         (unsigned long long)cputime64_to_clock_t(idle),
 529                         (unsigned long long)cputime64_to_clock_t(iowait),
 530                         (unsigned long long)cputime64_to_clock_t(irq),
 531                         (unsigned long long)cputime64_to_clock_t(softirq),
 532                         (unsigned long long)cputime64_to_clock_t(steal));
 533         }
 534         seq_printf(p, "intr %llu", (unsigned long long)sum);
 535
 536 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
 537         for (i = 0; i < NR_IRQS; i++)
 538                 seq_printf(p, " %u", kstat_irqs(i));
 539 #endif
 540
 541         seq_printf(p,
 542                 "\nctxt %llu\n"
 543                 "btime %lu\n"
 544                 "processes %lu\n"
 545                 "procs_running %lu\n"
 546                 "procs_blocked %lu\n",
 547                 nr_context_switches(),
 548                 (unsigned long)jif,
 549                 total_forks,
 550                 nr_running(),
 551                 nr_iowait());
 552
 553         return 0;
 554 }
 555
 556 static int stat_open(struct inode *inode, struct file *file)
 557 {
 558         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 559         char *buf;
 560         struct seq_file *m;
 561         int res;
 562
 563         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 564         if (size > 128 * 1024)
 565                 size = 128 * 1024;
 566         buf = kmalloc(size, GFP_KERNEL);
 567         if (!buf)
 568                 return -ENOMEM;
 569
 570         res = single_open(file, show_stat, NULL);
 571         if (!res) {
 572                 m = file->private_data;
 573                 m->buf = buf;
 574                 m->size = size;
 575         } else
 576                 kfree(buf);
 577         return res;
 578 }
 579 static struct file_operations proc_stat_operations = {
 580         .open           = stat_open,
 581         .read           = seq_read,
 582         .llseek         = seq_lseek,
 583         .release        = single_release,
 584 };
 585
 586 /*
 587  * /proc/interrupts
 588  */
 589 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 590 {
 591         return (*pos <= NR_IRQS) ? pos : NULL;
 592 }
 593
 594 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 595 {
 596         (*pos)++;
 597         if (*pos > NR_IRQS)
 598                 return NULL;
 599         return pos;
 600 }
 601
 602 static void int_seq_stop(struct seq_file *f, void *v)
 603 {
 604         /* Nothing to do */
 605 }
 606
 607
 608 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 609 static struct seq_operations int_seq_ops = {
 610         .start = int_seq_start,
 611         .next  = int_seq_next,
 612         .stop  = int_seq_stop,
 613         .show  = show_interrupts
 614 };
 615
 616 static int interrupts_open(struct inode *inode, struct file *filp)
 617 {
 618         return seq_open(filp, &int_seq_ops);
 619 }
 620
 621 static struct file_operations proc_interrupts_operations = {
 622         .open           = interrupts_open,
 623         .read           = seq_read,
 624         .llseek         = seq_lseek,
 625         .release        = seq_release,
 626 };
 627
 628 static int filesystems_read_proc(char *page, char **start, off_t off,
 629                                  int count, int *eof, void *data)
 630 {
 631         int len = get_filesystem_list(page);
 632         return proc_calc_metrics(page, start, off, count, eof, len);
 633 }
 634
 635 static int cmdline_read_proc(char *page, char **start, off_t off,
 636                                  int count, int *eof, void *data)
 637 {
 638         int len;
 639
 640         len = sprintf(page, "%s\n", saved_command_line);
 641         return proc_calc_metrics(page, start, off, count, eof, len);
 642 }
 643
 644 static int locks_read_proc(char *page, char **start, off_t off,
 645                                  int count, int *eof, void *data)
 646 {
 647         int len = get_locks_status(page, start, off, count);
 648
 649         if (len < count)
 650                 *eof = 1;
 651         return len;
 652 }
 653
 654 static int execdomains_read_proc(char *page, char **start, off_t off,
 655                                  int count, int *eof, void *data)
 656 {
 657         int len = get_exec_domain_list(page);
 658         return proc_calc_metrics(page, start, off, count, eof, len);
 659 }
 660
 661 #ifdef CONFIG_MAGIC_SYSRQ
 662 /*
 663  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 664  */
 665 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 666                                    size_t count, loff_t *ppos)
 667 {
 668         if (count) {
 669                 char c;
 670
 671                 if (get_user(c, buf))
 672                         return -EFAULT;
 673                 __handle_sysrq(c, NULL, 0);
 674         }
 675         return count;
 676 }
 677
 678 static struct file_operations proc_sysrq_trigger_operations = {
 679         .write          = write_sysrq_trigger,
 680 };
 681 #endif
 682
 683 struct proc_dir_entry *proc_root_kcore;
 684
 685 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 686 {
 687         struct proc_dir_entry *entry;
 688         entry = create_proc_entry(name, mode, NULL);
 689         if (entry)
 690                 entry->proc_fops = f;
 691 }
 692
 693 void __init proc_misc_init(void)
 694 {
 695         struct proc_dir_entry *entry;
 696         static struct {
 697                 char *name;
 698                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 699         } *p, simple_ones[] = {
 700                 {"loadavg",     loadavg_read_proc},
 701                 {"uptime",      uptime_read_proc},
 702                 {"meminfo",     meminfo_read_proc},
 703                 {"version",     version_read_proc},
 704 #ifdef CONFIG_PROC_HARDWARE
 705                 {"hardware",    hardware_read_proc},
 706 #endif
 707 #ifdef CONFIG_STRAM_PROC
 708                 {"stram",       stram_read_proc},
 709 #endif
 710                 {"filesystems", filesystems_read_proc},
 711                 {"cmdline",     cmdline_read_proc},
 712                 {"locks",       locks_read_proc},
 713                 {"execdomains", execdomains_read_proc},
 714                 {NULL,}
 715         };
 716         for (p = simple_ones; p->name; p++)
 717                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 718
 719         proc_symlink("mounts", NULL, "self/mounts");
 720
 721         /* And now for trickier ones */
 722 #ifdef CONFIG_PRINTK
 723         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 724         if (entry)
 725                 entry->proc_fops = &proc_kmsg_operations;
 726 #endif
 727         create_seq_entry("devices", 0, &proc_devinfo_operations);
 728         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 729 #ifdef CONFIG_BLOCK
 730         create_seq_entry("partitions", 0, &proc_partitions_operations);
 731 #endif
 732         create_seq_entry("stat", 0, &proc_stat_operations);
 733         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 734 #ifdef CONFIG_SLAB
 735         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 736 #ifdef CONFIG_DEBUG_SLAB_LEAK
 737         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 738 #endif
 739 #endif
 740         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 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         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 767         if (entry)
 768                 entry->proc_fops = &proc_sysrq_trigger_operations;
 769 #endif
 770 }