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/quicklist.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/ioport.h>
  30 #include <linux/mm.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/swap.h>
  35 #include <linux/slab.h>
  36 #include <linux/genhd.h>
  37 #include <linux/smp.h>
  38 #include <linux/signal.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/times.h>
  43 #include <linux/profile.h>
  44 #include <linux/utsname.h>
  45 #include <linux/blkdev.h>
  46 #include <linux/hugetlb.h>
  47 #include <linux/jiffies.h>
  48 #include <linux/vmalloc.h>
  49 #include <linux/crash_dump.h>
  50 #include <linux/pid_namespace.h>
  51 #include <linux/bootmem.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/pgtable.h>
  54 #include <asm/io.h>
  55 #include <asm/tlb.h>
  56 #include <asm/div64.h>
  57 #include "internal.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_exec_domain_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 int __attribute__((weak)) arch_report_meminfo(char *page)
 126 {
 127         return 0;
 128 }
 129
 130 static int meminfo_read_proc(char *page, char **start, off_t off,
 131                                  int count, int *eof, void *data)
 132 {
 133         struct sysinfo i;
 134         int len;
 135         unsigned long committed;
 136         unsigned long allowed;
 137         struct vmalloc_info vmi;
 138         long cached;
 139         unsigned long pages[NR_LRU_LISTS];
 140         int lru;
 141
 142 /*
 143  * display in kilobytes.
 144  */
 145 #define K(x) ((x) << (PAGE_SHIFT - 10))
 146         si_meminfo(&i);
 147         si_swapinfo(&i);
 148         committed = atomic_long_read(&vm_committed_space);
 149         allowed = ((totalram_pages - hugetlb_total_pages())
 150                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 151
 152         cached = global_page_state(NR_FILE_PAGES) -
 153                         total_swapcache_pages - i.bufferram;
 154         if (cached < 0)
 155                 cached = 0;
 156
 157         get_vmalloc_info(&vmi);
 158
 159         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
 160                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
 161
 162         /*
 163          * Tagged format, for easy grepping and expansion.
 164          */
 165         len = sprintf(page,
 166                 "MemTotal:       %8lu kB\n"
 167                 "MemFree:        %8lu kB\n"
 168                 "Buffers:        %8lu kB\n"
 169                 "Cached:         %8lu kB\n"
 170                 "SwapCached:     %8lu kB\n"
 171                 "Active:         %8lu kB\n"
 172                 "Inactive:       %8lu kB\n"
 173                 "Active(anon):   %8lu kB\n"
 174                 "Inactive(anon): %8lu kB\n"
 175                 "Active(file):   %8lu kB\n"
 176                 "Inactive(file): %8lu kB\n"
 177 #ifdef CONFIG_UNEVICTABLE_LRU
 178                 "Unevictable:    %8lu kB\n"
 179 #endif
 180 #ifdef CONFIG_HIGHMEM
 181                 "HighTotal:      %8lu kB\n"
 182                 "HighFree:       %8lu kB\n"
 183                 "LowTotal:       %8lu kB\n"
 184                 "LowFree:        %8lu kB\n"
 185 #endif
 186                 "SwapTotal:      %8lu kB\n"
 187                 "SwapFree:       %8lu kB\n"
 188                 "Dirty:          %8lu kB\n"
 189                 "Writeback:      %8lu kB\n"
 190                 "AnonPages:      %8lu kB\n"
 191                 "Mapped:         %8lu kB\n"
 192                 "Slab:           %8lu kB\n"
 193                 "SReclaimable:   %8lu kB\n"
 194                 "SUnreclaim:     %8lu kB\n"
 195                 "PageTables:     %8lu kB\n"
 196 #ifdef CONFIG_QUICKLIST
 197                 "Quicklists:     %8lu kB\n"
 198 #endif
 199                 "NFS_Unstable:   %8lu kB\n"
 200                 "Bounce:         %8lu kB\n"
 201                 "WritebackTmp:   %8lu kB\n"
 202                 "CommitLimit:    %8lu kB\n"
 203                 "Committed_AS:   %8lu kB\n"
 204                 "VmallocTotal:   %8lu kB\n"
 205                 "VmallocUsed:    %8lu kB\n"
 206                 "VmallocChunk:   %8lu kB\n",
 207                 K(i.totalram),
 208                 K(i.freeram),
 209                 K(i.bufferram),
 210                 K(cached),
 211                 K(total_swapcache_pages),
 212                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 213                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 214                 K(pages[LRU_ACTIVE_ANON]),
 215                 K(pages[LRU_INACTIVE_ANON]),
 216                 K(pages[LRU_ACTIVE_FILE]),
 217                 K(pages[LRU_INACTIVE_FILE]),
 218 #ifdef CONFIG_UNEVICTABLE_LRU
 219                 K(pages[LRU_UNEVICTABLE]),
 220 #endif
 221 #ifdef CONFIG_HIGHMEM
 222                 K(i.totalhigh),
 223                 K(i.freehigh),
 224                 K(i.totalram-i.totalhigh),
 225                 K(i.freeram-i.freehigh),
 226 #endif
 227                 K(i.totalswap),
 228                 K(i.freeswap),
 229                 K(global_page_state(NR_FILE_DIRTY)),
 230                 K(global_page_state(NR_WRITEBACK)),
 231                 K(global_page_state(NR_ANON_PAGES)),
 232                 K(global_page_state(NR_FILE_MAPPED)),
 233                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 234                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 235                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 236                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 237                 K(global_page_state(NR_PAGETABLE)),
 238 #ifdef CONFIG_QUICKLIST
 239                 K(quicklist_total_size()),
 240 #endif
 241                 K(global_page_state(NR_UNSTABLE_NFS)),
 242                 K(global_page_state(NR_BOUNCE)),
 243                 K(global_page_state(NR_WRITEBACK_TEMP)),
 244                 K(allowed),
 245                 K(committed),
 246                 (unsigned long)VMALLOC_TOTAL >> 10,
 247                 vmi.used >> 10,
 248                 vmi.largest_chunk >> 10
 249                 );
 250
 251                 len += hugetlb_report_meminfo(page + len);
 252
 253         len += arch_report_meminfo(page + len);
 254
 255         return proc_calc_metrics(page, start, off, count, eof, len);
 256 #undef K
 257 }
 258
 259 static int fragmentation_open(struct inode *inode, struct file *file)
 260 {
 261         (void)inode;
 262         return seq_open(file, &fragmentation_op);
 263 }
 264
 265 static const struct file_operations fragmentation_file_operations = {
 266         .open           = fragmentation_open,
 267         .read           = seq_read,
 268         .llseek         = seq_lseek,
 269         .release        = seq_release,
 270 };
 271
 272 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 273 {
 274         return seq_open(file, &pagetypeinfo_op);
 275 }
 276
 277 static const struct file_operations pagetypeinfo_file_ops = {
 278         .open           = pagetypeinfo_open,
 279         .read           = seq_read,
 280         .llseek         = seq_lseek,
 281         .release        = seq_release,
 282 };
 283
 284 static int zoneinfo_open(struct inode *inode, struct file *file)
 285 {
 286         return seq_open(file, &zoneinfo_op);
 287 }
 288
 289 static const struct file_operations proc_zoneinfo_file_operations = {
 290         .open           = zoneinfo_open,
 291         .read           = seq_read,
 292         .llseek         = seq_lseek,
 293         .release        = seq_release,
 294 };
 295
 296 static int version_read_proc(char *page, char **start, off_t off,
 297                                  int count, int *eof, void *data)
 298 {
 299         int len;
 300
 301         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 302                 utsname()->sysname,
 303                 utsname()->release,
 304                 utsname()->version);
 305         return proc_calc_metrics(page, start, off, count, eof, len);
 306 }
 307
 308 extern const struct seq_operations cpuinfo_op;
 309 static int cpuinfo_open(struct inode *inode, struct file *file)
 310 {
 311         return seq_open(file, &cpuinfo_op);
 312 }
 313
 314 static const struct file_operations proc_cpuinfo_operations = {
 315         .open           = cpuinfo_open,
 316         .read           = seq_read,
 317         .llseek         = seq_lseek,
 318         .release        = seq_release,
 319 };
 320
 321 static int devinfo_show(struct seq_file *f, void *v)
 322 {
 323         int i = *(loff_t *) v;
 324
 325         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 326                 if (i == 0)
 327                         seq_printf(f, "Character devices:\n");
 328                 chrdev_show(f, i);
 329         }
 330 #ifdef CONFIG_BLOCK
 331         else {
 332                 i -= CHRDEV_MAJOR_HASH_SIZE;
 333                 if (i == 0)
 334                         seq_printf(f, "\nBlock devices:\n");
 335                 blkdev_show(f, i);
 336         }
 337 #endif
 338         return 0;
 339 }
 340
 341 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 342 {
 343         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 344                 return pos;
 345         return NULL;
 346 }
 347
 348 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 349 {
 350         (*pos)++;
 351         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 352                 return NULL;
 353         return pos;
 354 }
 355
 356 static void devinfo_stop(struct seq_file *f, void *v)
 357 {
 358         /* Nothing to do */
 359 }
 360
 361 static const struct seq_operations devinfo_ops = {
 362         .start = devinfo_start,
 363         .next  = devinfo_next,
 364         .stop  = devinfo_stop,
 365         .show  = devinfo_show
 366 };
 367
 368 static int devinfo_open(struct inode *inode, struct file *filp)
 369 {
 370         return seq_open(filp, &devinfo_ops);
 371 }
 372
 373 static const struct file_operations proc_devinfo_operations = {
 374         .open           = devinfo_open,
 375         .read           = seq_read,
 376         .llseek         = seq_lseek,
 377         .release        = seq_release,
 378 };
 379
 380 static int vmstat_open(struct inode *inode, struct file *file)
 381 {
 382         return seq_open(file, &vmstat_op);
 383 }
 384 static const struct file_operations proc_vmstat_file_operations = {
 385         .open           = vmstat_open,
 386         .read           = seq_read,
 387         .llseek         = seq_lseek,
 388         .release        = seq_release,
 389 };
 390
 391 #ifdef CONFIG_PROC_HARDWARE
 392 static int hardware_read_proc(char *page, char **start, off_t off,
 393                                  int count, int *eof, void *data)
 394 {
 395         int len = get_hardware_list(page);
 396         return proc_calc_metrics(page, start, off, count, eof, len);
 397 }
 398 #endif
 399
 400 #ifdef CONFIG_STRAM_PROC
 401 static int stram_read_proc(char *page, char **start, off_t off,
 402                                  int count, int *eof, void *data)
 403 {
 404         int len = get_stram_list(page);
 405         return proc_calc_metrics(page, start, off, count, eof, len);
 406 }
 407 #endif
 408
 409 #ifdef CONFIG_BLOCK
 410 static int partitions_open(struct inode *inode, struct file *file)
 411 {
 412         return seq_open(file, &partitions_op);
 413 }
 414 static const struct file_operations proc_partitions_operations = {
 415         .open           = partitions_open,
 416         .read           = seq_read,
 417         .llseek         = seq_lseek,
 418         .release        = seq_release,
 419 };
 420
 421 static int diskstats_open(struct inode *inode, struct file *file)
 422 {
 423         return seq_open(file, &diskstats_op);
 424 }
 425 static const struct file_operations proc_diskstats_operations = {
 426         .open           = diskstats_open,
 427         .read           = seq_read,
 428         .llseek         = seq_lseek,
 429         .release        = seq_release,
 430 };
 431 #endif
 432
 433 #ifdef CONFIG_MODULES
 434 extern const struct seq_operations modules_op;
 435 static int modules_open(struct inode *inode, struct file *file)
 436 {
 437         return seq_open(file, &modules_op);
 438 }
 439 static const struct file_operations proc_modules_operations = {
 440         .open           = modules_open,
 441         .read           = seq_read,
 442         .llseek         = seq_lseek,
 443         .release        = seq_release,
 444 };
 445 #endif
 446
 447 #ifdef CONFIG_SLABINFO
 448 static int slabinfo_open(struct inode *inode, struct file *file)
 449 {
 450         return seq_open(file, &slabinfo_op);
 451 }
 452 static const struct file_operations proc_slabinfo_operations = {
 453         .open           = slabinfo_open,
 454         .read           = seq_read,
 455         .write          = slabinfo_write,
 456         .llseek         = seq_lseek,
 457         .release        = seq_release,
 458 };
 459
 460 #ifdef CONFIG_DEBUG_SLAB_LEAK
 461 extern const struct seq_operations slabstats_op;
 462 static int slabstats_open(struct inode *inode, struct file *file)
 463 {
 464         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 465         int ret = -ENOMEM;
 466         if (n) {
 467                 ret = seq_open(file, &slabstats_op);
 468                 if (!ret) {
 469                         struct seq_file *m = file->private_data;
 470                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 471                         m->private = n;
 472                         n = NULL;
 473                 }
 474                 kfree(n);
 475         }
 476         return ret;
 477 }
 478
 479 static const struct file_operations proc_slabstats_operations = {
 480         .open           = slabstats_open,
 481         .read           = seq_read,
 482         .llseek         = seq_lseek,
 483         .release        = seq_release_private,
 484 };
 485 #endif
 486 #endif
 487
 488 #ifdef CONFIG_MMU
 489 static int vmalloc_open(struct inode *inode, struct file *file)
 490 {
 491         unsigned int *ptr = NULL;
 492         int ret;
 493
 494         if (NUMA_BUILD)
 495                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 496         ret = seq_open(file, &vmalloc_op);
 497         if (!ret) {
 498                 struct seq_file *m = file->private_data;
 499                 m->private = ptr;
 500         } else
 501                 kfree(ptr);
 502         return ret;
 503 }
 504
 505 static const struct file_operations proc_vmalloc_operations = {
 506         .open           = vmalloc_open,
 507         .read           = seq_read,
 508         .llseek         = seq_lseek,
 509         .release        = seq_release_private,
 510 };
 511 #endif
 512
 513 #ifndef arch_irq_stat_cpu
 514 #define arch_irq_stat_cpu(cpu) 0
 515 #endif
 516 #ifndef arch_irq_stat
 517 #define arch_irq_stat() 0
 518 #endif
 519
 520 static int show_stat(struct seq_file *p, void *v)
 521 {
 522         int i;
 523         unsigned long jif;
 524         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 525         cputime64_t guest;
 526         u64 sum = 0;
 527         struct timespec boottime;
 528         unsigned int *per_irq_sum;
 529
 530         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
 531         if (!per_irq_sum)
 532                 return -ENOMEM;
 533
 534         user = nice = system = idle = iowait =
 535                 irq = softirq = steal = cputime64_zero;
 536         guest = cputime64_zero;
 537         getboottime(&boottime);
 538         jif = boottime.tv_sec;
 539
 540         for_each_possible_cpu(i) {
 541                 int j;
 542
 543                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 544                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 545                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 546                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 547                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 548                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 549                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 550                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 551                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 552                 for (j = 0; j < NR_IRQS; j++) {
 553                         unsigned int temp = kstat_cpu(i).irqs[j];
 554                         sum += temp;
 555                         per_irq_sum[j] += temp;
 556                 }
 557                 sum += arch_irq_stat_cpu(i);
 558         }
 559         sum += arch_irq_stat();
 560
 561         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 562                 (unsigned long long)cputime64_to_clock_t(user),
 563                 (unsigned long long)cputime64_to_clock_t(nice),
 564                 (unsigned long long)cputime64_to_clock_t(system),
 565                 (unsigned long long)cputime64_to_clock_t(idle),
 566                 (unsigned long long)cputime64_to_clock_t(iowait),
 567                 (unsigned long long)cputime64_to_clock_t(irq),
 568                 (unsigned long long)cputime64_to_clock_t(softirq),
 569                 (unsigned long long)cputime64_to_clock_t(steal),
 570                 (unsigned long long)cputime64_to_clock_t(guest));
 571         for_each_online_cpu(i) {
 572
 573                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 574                 user = kstat_cpu(i).cpustat.user;
 575                 nice = kstat_cpu(i).cpustat.nice;
 576                 system = kstat_cpu(i).cpustat.system;
 577                 idle = kstat_cpu(i).cpustat.idle;
 578                 iowait = kstat_cpu(i).cpustat.iowait;
 579                 irq = kstat_cpu(i).cpustat.irq;
 580                 softirq = kstat_cpu(i).cpustat.softirq;
 581                 steal = kstat_cpu(i).cpustat.steal;
 582                 guest = kstat_cpu(i).cpustat.guest;
 583                 seq_printf(p,
 584                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 585                         i,
 586                         (unsigned long long)cputime64_to_clock_t(user),
 587                         (unsigned long long)cputime64_to_clock_t(nice),
 588                         (unsigned long long)cputime64_to_clock_t(system),
 589                         (unsigned long long)cputime64_to_clock_t(idle),
 590                         (unsigned long long)cputime64_to_clock_t(iowait),
 591                         (unsigned long long)cputime64_to_clock_t(irq),
 592                         (unsigned long long)cputime64_to_clock_t(softirq),
 593                         (unsigned long long)cputime64_to_clock_t(steal),
 594                         (unsigned long long)cputime64_to_clock_t(guest));
 595         }
 596         seq_printf(p, "intr %llu", (unsigned long long)sum);
 597
 598         for (i = 0; i < NR_IRQS; i++)
 599                 seq_printf(p, " %u", per_irq_sum[i]);
 600
 601         seq_printf(p,
 602                 "\nctxt %llu\n"
 603                 "btime %lu\n"
 604                 "processes %lu\n"
 605                 "procs_running %lu\n"
 606                 "procs_blocked %lu\n",
 607                 nr_context_switches(),
 608                 (unsigned long)jif,
 609                 total_forks,
 610                 nr_running(),
 611                 nr_iowait());
 612
 613         kfree(per_irq_sum);
 614         return 0;
 615 }
 616
 617 static int stat_open(struct inode *inode, struct file *file)
 618 {
 619         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 620         char *buf;
 621         struct seq_file *m;
 622         int res;
 623
 624         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 625         if (size > 128 * 1024)
 626                 size = 128 * 1024;
 627         buf = kmalloc(size, GFP_KERNEL);
 628         if (!buf)
 629                 return -ENOMEM;
 630
 631         res = single_open(file, show_stat, NULL);
 632         if (!res) {
 633                 m = file->private_data;
 634                 m->buf = buf;
 635                 m->size = size;
 636         } else
 637                 kfree(buf);
 638         return res;
 639 }
 640 static const struct file_operations proc_stat_operations = {
 641         .open           = stat_open,
 642         .read           = seq_read,
 643         .llseek         = seq_lseek,
 644         .release        = single_release,
 645 };
 646
 647 /*
 648  * /proc/interrupts
 649  */
 650 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 651 {
 652         return (*pos <= NR_IRQS) ? pos : NULL;
 653 }
 654
 655 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 656 {
 657         (*pos)++;
 658         if (*pos > NR_IRQS)
 659                 return NULL;
 660         return pos;
 661 }
 662
 663 static void int_seq_stop(struct seq_file *f, void *v)
 664 {
 665         /* Nothing to do */
 666 }
 667
 668
 669 static const struct seq_operations int_seq_ops = {
 670         .start = int_seq_start,
 671         .next  = int_seq_next,
 672         .stop  = int_seq_stop,
 673         .show  = show_interrupts
 674 };
 675
 676 static int interrupts_open(struct inode *inode, struct file *filp)
 677 {
 678         return seq_open(filp, &int_seq_ops);
 679 }
 680
 681 static const struct file_operations proc_interrupts_operations = {
 682         .open           = interrupts_open,
 683         .read           = seq_read,
 684         .llseek         = seq_lseek,
 685         .release        = seq_release,
 686 };
 687
 688 static int filesystems_read_proc(char *page, char **start, off_t off,
 689                                  int count, int *eof, void *data)
 690 {
 691         int len = get_filesystem_list(page);
 692         return proc_calc_metrics(page, start, off, count, eof, len);
 693 }
 694
 695 static int cmdline_read_proc(char *page, char **start, off_t off,
 696                                  int count, int *eof, void *data)
 697 {
 698         int len;
 699
 700         len = sprintf(page, "%s\n", saved_command_line);
 701         return proc_calc_metrics(page, start, off, count, eof, len);
 702 }
 703
 704 #ifdef CONFIG_FILE_LOCKING
 705 static int locks_open(struct inode *inode, struct file *filp)
 706 {
 707         return seq_open(filp, &locks_seq_operations);
 708 }
 709
 710 static const struct file_operations proc_locks_operations = {
 711         .open           = locks_open,
 712         .read           = seq_read,
 713         .llseek         = seq_lseek,
 714         .release        = seq_release,
 715 };
 716 #endif /* CONFIG_FILE_LOCKING */
 717
 718 static int execdomains_read_proc(char *page, char **start, off_t off,
 719                                  int count, int *eof, void *data)
 720 {
 721         int len = get_exec_domain_list(page);
 722         return proc_calc_metrics(page, start, off, count, eof, len);
 723 }
 724
 725 #ifdef CONFIG_PROC_PAGE_MONITOR
 726 #define KPMSIZE sizeof(u64)
 727 #define KPMMASK (KPMSIZE - 1)
 728 /* /proc/kpagecount - an array exposing page counts
 729  *
 730  * Each entry is a u64 representing the corresponding
 731  * physical page count.
 732  */
 733 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 734                              size_t count, loff_t *ppos)
 735 {
 736         u64 __user *out = (u64 __user *)buf;
 737         struct page *ppage;
 738         unsigned long src = *ppos;
 739         unsigned long pfn;
 740         ssize_t ret = 0;
 741         u64 pcount;
 742
 743         pfn = src / KPMSIZE;
 744         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 745         if (src & KPMMASK || count & KPMMASK)
 746                 return -EINVAL;
 747
 748         while (count > 0) {
 749                 ppage = NULL;
 750                 if (pfn_valid(pfn))
 751                         ppage = pfn_to_page(pfn);
 752                 pfn++;
 753                 if (!ppage)
 754                         pcount = 0;
 755                 else
 756                         pcount = page_mapcount(ppage);
 757
 758                 if (put_user(pcount, out++)) {
 759                         ret = -EFAULT;
 760                         break;
 761                 }
 762
 763                 count -= KPMSIZE;
 764         }
 765
 766         *ppos += (char __user *)out - buf;
 767         if (!ret)
 768                 ret = (char __user *)out - buf;
 769         return ret;
 770 }
 771
 772 static struct file_operations proc_kpagecount_operations = {
 773         .llseek = mem_lseek,
 774         .read = kpagecount_read,
 775 };
 776
 777 /* /proc/kpageflags - an array exposing page flags
 778  *
 779  * Each entry is a u64 representing the corresponding
 780  * physical page flags.
 781  */
 782
 783 /* These macros are used to decouple internal flags from exported ones */
 784
 785 #define KPF_LOCKED     0
 786 #define KPF_ERROR      1
 787 #define KPF_REFERENCED 2
 788 #define KPF_UPTODATE   3
 789 #define KPF_DIRTY      4
 790 #define KPF_LRU        5
 791 #define KPF_ACTIVE     6
 792 #define KPF_SLAB       7
 793 #define KPF_WRITEBACK  8
 794 #define KPF_RECLAIM    9
 795 #define KPF_BUDDY     10
 796
 797 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 798
 799 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 800                              size_t count, loff_t *ppos)
 801 {
 802         u64 __user *out = (u64 __user *)buf;
 803         struct page *ppage;
 804         unsigned long src = *ppos;
 805         unsigned long pfn;
 806         ssize_t ret = 0;
 807         u64 kflags, uflags;
 808
 809         pfn = src / KPMSIZE;
 810         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 811         if (src & KPMMASK || count & KPMMASK)
 812                 return -EINVAL;
 813
 814         while (count > 0) {
 815                 ppage = NULL;
 816                 if (pfn_valid(pfn))
 817                         ppage = pfn_to_page(pfn);
 818                 pfn++;
 819                 if (!ppage)
 820                         kflags = 0;
 821                 else
 822                         kflags = ppage->flags;
 823
 824                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 825                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 826                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 827                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 828                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 829                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 830                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 831                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 832                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 833                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 834                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 835
 836                 if (put_user(uflags, out++)) {
 837                         ret = -EFAULT;
 838                         break;
 839                 }
 840
 841                 count -= KPMSIZE;
 842         }
 843
 844         *ppos += (char __user *)out - buf;
 845         if (!ret)
 846                 ret = (char __user *)out - buf;
 847         return ret;
 848 }
 849
 850 static struct file_operations proc_kpageflags_operations = {
 851         .llseek = mem_lseek,
 852         .read = kpageflags_read,
 853 };
 854 #endif /* CONFIG_PROC_PAGE_MONITOR */
 855
 856 struct proc_dir_entry *proc_root_kcore;
 857
 858 void __init proc_misc_init(void)
 859 {
 860         static struct {
 861                 char *name;
 862                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 863         } *p, simple_ones[] = {
 864                 {"loadavg",     loadavg_read_proc},
 865                 {"uptime",      uptime_read_proc},
 866                 {"meminfo",     meminfo_read_proc},
 867                 {"version",     version_read_proc},
 868 #ifdef CONFIG_PROC_HARDWARE
 869                 {"hardware",    hardware_read_proc},
 870 #endif
 871 #ifdef CONFIG_STRAM_PROC
 872                 {"stram",       stram_read_proc},
 873 #endif
 874                 {"filesystems", filesystems_read_proc},
 875                 {"cmdline",     cmdline_read_proc},
 876                 {"execdomains", execdomains_read_proc},
 877                 {NULL,}
 878         };
 879         for (p = simple_ones; p->name; p++)
 880                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 881
 882         proc_symlink("mounts", NULL, "self/mounts");
 883
 884         /* And now for trickier ones */
 885 #ifdef CONFIG_PRINTK
 886         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
 887 #endif
 888 #ifdef CONFIG_FILE_LOCKING
 889         proc_create("locks", 0, NULL, &proc_locks_operations);
 890 #endif
 891         proc_create("devices", 0, NULL, &proc_devinfo_operations);
 892         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 893 #ifdef CONFIG_BLOCK
 894         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 895 #endif
 896         proc_create("stat", 0, NULL, &proc_stat_operations);
 897         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 898 #ifdef CONFIG_SLABINFO
 899         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 900 #ifdef CONFIG_DEBUG_SLAB_LEAK
 901         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 902 #endif
 903 #endif
 904 #ifdef CONFIG_MMU
 905         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 906 #endif
 907         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 908         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 909         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 910         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 911 #ifdef CONFIG_BLOCK
 912         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 913 #endif
 914 #ifdef CONFIG_MODULES
 915         proc_create("modules", 0, NULL, &proc_modules_operations);
 916 #endif
 917 #ifdef CONFIG_SCHEDSTATS
 918         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 919 #endif
 920 #ifdef CONFIG_PROC_KCORE
 921         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 922         if (proc_root_kcore)
 923                 proc_root_kcore->size =
 924                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 925 #endif
 926 #ifdef CONFIG_PROC_PAGE_MONITOR
 927         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 928         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 929 #endif
 930 #ifdef CONFIG_PROC_VMCORE
 931         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 932 #endif
 933 }