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