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