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/irq.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/swap.h>
  36 #include <linux/slab.h>
  37 #include <linux/genhd.h>
  38 #include <linux/smp.h>
  39 #include <linux/signal.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/times.h>
  44 #include <linux/profile.h>
  45 #include <linux/utsname.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/hugetlb.h>
  48 #include <linux/jiffies.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/crash_dump.h>
  51 #include <linux/pid_namespace.h>
  52 #include <linux/bootmem.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/pgtable.h>
  55 #include <asm/io.h>
  56 #include <asm/tlb.h>
  57 #include <asm/div64.h>
  58 #include "internal.h"
  59
  60 #define LOAD_INT(x) ((x) >> FSHIFT)
  61 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  62 /*
  63  * Warning: stuff below (imported functions) assumes that its output will fit
  64  * into one page. For some of those functions it may be wrong. Moreover, we
  65  * have a way to deal with that gracefully. Right now I used straightforward
  66  * wrappers, but this needs further analysis wrt potential overflows.
  67  */
  68 extern int get_hardware_list(char *);
  69 extern int get_stram_list(char *);
  70 extern int get_exec_domain_list(char *);
  71
  72 static int proc_calc_metrics(char *page, char **start, off_t off,
  73                                  int count, int *eof, int len)
  74 {
  75         if (len <= off+count) *eof = 1;
  76         *start = page + off;
  77         len -= off;
  78         if (len>count) len = count;
  79         if (len<0) len = 0;
  80         return len;
  81 }
  82
  83 static int loadavg_read_proc(char *page, char **start, off_t off,
  84                                  int count, int *eof, void *data)
  85 {
  86         int a, b, c;
  87         int len;
  88         unsigned long seq;
  89
  90         do {
  91                 seq = read_seqbegin(&xtime_lock);
  92                 a = avenrun[0] + (FIXED_1/200);
  93                 b = avenrun[1] + (FIXED_1/200);
  94                 c = avenrun[2] + (FIXED_1/200);
  95         } while (read_seqretry(&xtime_lock, seq));
  96
  97         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  98                 LOAD_INT(a), LOAD_FRAC(a),
  99                 LOAD_INT(b), LOAD_FRAC(b),
 100                 LOAD_INT(c), LOAD_FRAC(c),
 101                 nr_running(), nr_threads,
 102                 task_active_pid_ns(current)->last_pid);
 103         return proc_calc_metrics(page, start, off, count, eof, len);
 104 }
 105
 106 static int uptime_read_proc(char *page, char **start, off_t off,
 107                                  int count, int *eof, void *data)
 108 {
 109         struct timespec uptime;
 110         struct timespec idle;
 111         int len;
 112         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 113
 114         do_posix_clock_monotonic_gettime(&uptime);
 115         monotonic_to_bootbased(&uptime);
 116         cputime_to_timespec(idletime, &idle);
 117         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 118                         (unsigned long) uptime.tv_sec,
 119                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 120                         (unsigned long) idle.tv_sec,
 121                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 122
 123         return proc_calc_metrics(page, start, off, count, eof, len);
 124 }
 125
 126 int __attribute__((weak)) arch_report_meminfo(char *page)
 127 {
 128         return 0;
 129 }
 130
 131 static int meminfo_read_proc(char *page, char **start, off_t off,
 132                                  int count, int *eof, void *data)
 133 {
 134         struct sysinfo i;
 135         int len;
 136         unsigned long committed;
 137         unsigned long allowed;
 138         struct vmalloc_info vmi;
 139         long cached;
 140         unsigned long pages[NR_LRU_LISTS];
 141         int lru;
 142
 143 /*
 144  * display in kilobytes.
 145  */
 146 #define K(x) ((x) << (PAGE_SHIFT - 10))
 147         si_meminfo(&i);
 148         si_swapinfo(&i);
 149         committed = atomic_long_read(&vm_committed_space);
 150         allowed = ((totalram_pages - hugetlb_total_pages())
 151                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 152
 153         cached = global_page_state(NR_FILE_PAGES) -
 154                         total_swapcache_pages - i.bufferram;
 155         if (cached < 0)
 156                 cached = 0;
 157
 158         get_vmalloc_info(&vmi);
 159
 160         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
 161                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
 162
 163         /*
 164          * Tagged format, for easy grepping and expansion.
 165          */
 166         len = sprintf(page,
 167                 "MemTotal:       %8lu kB\n"
 168                 "MemFree:        %8lu kB\n"
 169                 "Buffers:        %8lu kB\n"
 170                 "Cached:         %8lu kB\n"
 171                 "SwapCached:     %8lu kB\n"
 172                 "Active:         %8lu kB\n"
 173                 "Inactive:       %8lu kB\n"
 174                 "Active(anon):   %8lu kB\n"
 175                 "Inactive(anon): %8lu kB\n"
 176                 "Active(file):   %8lu kB\n"
 177                 "Inactive(file): %8lu kB\n"
 178 #ifdef CONFIG_UNEVICTABLE_LRU
 179                 "Unevictable:    %8lu kB\n"
 180                 "Mlocked:        %8lu kB\n"
 181 #endif
 182 #ifdef CONFIG_HIGHMEM
 183                 "HighTotal:      %8lu kB\n"
 184                 "HighFree:       %8lu kB\n"
 185                 "LowTotal:       %8lu kB\n"
 186                 "LowFree:        %8lu kB\n"
 187 #endif
 188                 "SwapTotal:      %8lu kB\n"
 189                 "SwapFree:       %8lu kB\n"
 190                 "Dirty:          %8lu kB\n"
 191                 "Writeback:      %8lu kB\n"
 192                 "AnonPages:      %8lu kB\n"
 193                 "Mapped:         %8lu kB\n"
 194                 "Slab:           %8lu kB\n"
 195                 "SReclaimable:   %8lu kB\n"
 196                 "SUnreclaim:     %8lu kB\n"
 197                 "PageTables:     %8lu kB\n"
 198 #ifdef CONFIG_QUICKLIST
 199                 "Quicklists:     %8lu kB\n"
 200 #endif
 201                 "NFS_Unstable:   %8lu kB\n"
 202                 "Bounce:         %8lu kB\n"
 203                 "WritebackTmp:   %8lu kB\n"
 204                 "CommitLimit:    %8lu kB\n"
 205                 "Committed_AS:   %8lu kB\n"
 206                 "VmallocTotal:   %8lu kB\n"
 207                 "VmallocUsed:    %8lu kB\n"
 208                 "VmallocChunk:   %8lu kB\n",
 209                 K(i.totalram),
 210                 K(i.freeram),
 211                 K(i.bufferram),
 212                 K(cached),
 213                 K(total_swapcache_pages),
 214                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 215                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 216                 K(pages[LRU_ACTIVE_ANON]),
 217                 K(pages[LRU_INACTIVE_ANON]),
 218                 K(pages[LRU_ACTIVE_FILE]),
 219                 K(pages[LRU_INACTIVE_FILE]),
 220 #ifdef CONFIG_UNEVICTABLE_LRU
 221                 K(pages[LRU_UNEVICTABLE]),
 222                 K(global_page_state(NR_MLOCK)),
 223 #endif
 224 #ifdef CONFIG_HIGHMEM
 225                 K(i.totalhigh),
 226                 K(i.freehigh),
 227                 K(i.totalram-i.totalhigh),
 228                 K(i.freeram-i.freehigh),
 229 #endif
 230                 K(i.totalswap),
 231                 K(i.freeswap),
 232                 K(global_page_state(NR_FILE_DIRTY)),
 233                 K(global_page_state(NR_WRITEBACK)),
 234                 K(global_page_state(NR_ANON_PAGES)),
 235                 K(global_page_state(NR_FILE_MAPPED)),
 236                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 237                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 238                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 239                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 240                 K(global_page_state(NR_PAGETABLE)),
 241 #ifdef CONFIG_QUICKLIST
 242                 K(quicklist_total_size()),
 243 #endif
 244                 K(global_page_state(NR_UNSTABLE_NFS)),
 245                 K(global_page_state(NR_BOUNCE)),
 246                 K(global_page_state(NR_WRITEBACK_TEMP)),
 247                 K(allowed),
 248                 K(committed),
 249                 (unsigned long)VMALLOC_TOTAL >> 10,
 250                 vmi.used >> 10,
 251                 vmi.largest_chunk >> 10
 252                 );
 253
 254                 len += hugetlb_report_meminfo(page + len);
 255
 256         len += arch_report_meminfo(page + len);
 257
 258         return proc_calc_metrics(page, start, off, count, eof, len);
 259 #undef K
 260 }
 261
 262 static int fragmentation_open(struct inode *inode, struct file *file)
 263 {
 264         (void)inode;
 265         return seq_open(file, &fragmentation_op);
 266 }
 267
 268 static const struct file_operations fragmentation_file_operations = {
 269         .open           = fragmentation_open,
 270         .read           = seq_read,
 271         .llseek         = seq_lseek,
 272         .release        = seq_release,
 273 };
 274
 275 static int pagetypeinfo_open(struct inode *inode, struct file *file)
 276 {
 277         return seq_open(file, &pagetypeinfo_op);
 278 }
 279
 280 static const struct file_operations pagetypeinfo_file_ops = {
 281         .open           = pagetypeinfo_open,
 282         .read           = seq_read,
 283         .llseek         = seq_lseek,
 284         .release        = seq_release,
 285 };
 286
 287 static int zoneinfo_open(struct inode *inode, struct file *file)
 288 {
 289         return seq_open(file, &zoneinfo_op);
 290 }
 291
 292 static const struct file_operations proc_zoneinfo_file_operations = {
 293         .open           = zoneinfo_open,
 294         .read           = seq_read,
 295         .llseek         = seq_lseek,
 296         .release        = seq_release,
 297 };
 298
 299 static int version_read_proc(char *page, char **start, off_t off,
 300                                  int count, int *eof, void *data)
 301 {
 302         int len;
 303
 304         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
 305                 utsname()->sysname,
 306                 utsname()->release,
 307                 utsname()->version);
 308         return proc_calc_metrics(page, start, off, count, eof, len);
 309 }
 310
 311 extern const struct seq_operations cpuinfo_op;
 312 static int cpuinfo_open(struct inode *inode, struct file *file)
 313 {
 314         return seq_open(file, &cpuinfo_op);
 315 }
 316
 317 static const struct file_operations proc_cpuinfo_operations = {
 318         .open           = cpuinfo_open,
 319         .read           = seq_read,
 320         .llseek         = seq_lseek,
 321         .release        = seq_release,
 322 };
 323
 324 static int devinfo_show(struct seq_file *f, void *v)
 325 {
 326         int i = *(loff_t *) v;
 327
 328         if (i < CHRDEV_MAJOR_HASH_SIZE) {
 329                 if (i == 0)
 330                         seq_printf(f, "Character devices:\n");
 331                 chrdev_show(f, i);
 332         }
 333 #ifdef CONFIG_BLOCK
 334         else {
 335                 i -= CHRDEV_MAJOR_HASH_SIZE;
 336                 if (i == 0)
 337                         seq_printf(f, "\nBlock devices:\n");
 338                 blkdev_show(f, i);
 339         }
 340 #endif
 341         return 0;
 342 }
 343
 344 static void *devinfo_start(struct seq_file *f, loff_t *pos)
 345 {
 346         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 347                 return pos;
 348         return NULL;
 349 }
 350
 351 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 352 {
 353         (*pos)++;
 354         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
 355                 return NULL;
 356         return pos;
 357 }
 358
 359 static void devinfo_stop(struct seq_file *f, void *v)
 360 {
 361         /* Nothing to do */
 362 }
 363
 364 static const struct seq_operations devinfo_ops = {
 365         .start = devinfo_start,
 366         .next  = devinfo_next,
 367         .stop  = devinfo_stop,
 368         .show  = devinfo_show
 369 };
 370
 371 static int devinfo_open(struct inode *inode, struct file *filp)
 372 {
 373         return seq_open(filp, &devinfo_ops);
 374 }
 375
 376 static const struct file_operations proc_devinfo_operations = {
 377         .open           = devinfo_open,
 378         .read           = seq_read,
 379         .llseek         = seq_lseek,
 380         .release        = seq_release,
 381 };
 382
 383 static int vmstat_open(struct inode *inode, struct file *file)
 384 {
 385         return seq_open(file, &vmstat_op);
 386 }
 387 static const struct file_operations proc_vmstat_file_operations = {
 388         .open           = vmstat_open,
 389         .read           = seq_read,
 390         .llseek         = seq_lseek,
 391         .release        = seq_release,
 392 };
 393
 394 #ifdef CONFIG_PROC_HARDWARE
 395 static int hardware_read_proc(char *page, char **start, off_t off,
 396                                  int count, int *eof, void *data)
 397 {
 398         int len = get_hardware_list(page);
 399         return proc_calc_metrics(page, start, off, count, eof, len);
 400 }
 401 #endif
 402
 403 #ifdef CONFIG_STRAM_PROC
 404 static int stram_read_proc(char *page, char **start, off_t off,
 405                                  int count, int *eof, void *data)
 406 {
 407         int len = get_stram_list(page);
 408         return proc_calc_metrics(page, start, off, count, eof, len);
 409 }
 410 #endif
 411
 412 #ifdef CONFIG_BLOCK
 413 static int partitions_open(struct inode *inode, struct file *file)
 414 {
 415         return seq_open(file, &partitions_op);
 416 }
 417 static const struct file_operations proc_partitions_operations = {
 418         .open           = partitions_open,
 419         .read           = seq_read,
 420         .llseek         = seq_lseek,
 421         .release        = seq_release,
 422 };
 423
 424 static int diskstats_open(struct inode *inode, struct file *file)
 425 {
 426         return seq_open(file, &diskstats_op);
 427 }
 428 static const struct file_operations proc_diskstats_operations = {
 429         .open           = diskstats_open,
 430         .read           = seq_read,
 431         .llseek         = seq_lseek,
 432         .release        = seq_release,
 433 };
 434 #endif
 435
 436 #ifdef CONFIG_MODULES
 437 extern const struct seq_operations modules_op;
 438 static int modules_open(struct inode *inode, struct file *file)
 439 {
 440         return seq_open(file, &modules_op);
 441 }
 442 static const struct file_operations proc_modules_operations = {
 443         .open           = modules_open,
 444         .read           = seq_read,
 445         .llseek         = seq_lseek,
 446         .release        = seq_release,
 447 };
 448 #endif
 449
 450 #ifdef CONFIG_SLABINFO
 451 static int slabinfo_open(struct inode *inode, struct file *file)
 452 {
 453         return seq_open(file, &slabinfo_op);
 454 }
 455 static const struct file_operations proc_slabinfo_operations = {
 456         .open           = slabinfo_open,
 457         .read           = seq_read,
 458         .write          = slabinfo_write,
 459         .llseek         = seq_lseek,
 460         .release        = seq_release,
 461 };
 462
 463 #ifdef CONFIG_DEBUG_SLAB_LEAK
 464 extern const struct seq_operations slabstats_op;
 465 static int slabstats_open(struct inode *inode, struct file *file)
 466 {
 467         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 468         int ret = -ENOMEM;
 469         if (n) {
 470                 ret = seq_open(file, &slabstats_op);
 471                 if (!ret) {
 472                         struct seq_file *m = file->private_data;
 473                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 474                         m->private = n;
 475                         n = NULL;
 476                 }
 477                 kfree(n);
 478         }
 479         return ret;
 480 }
 481
 482 static const struct file_operations proc_slabstats_operations = {
 483         .open           = slabstats_open,
 484         .read           = seq_read,
 485         .llseek         = seq_lseek,
 486         .release        = seq_release_private,
 487 };
 488 #endif
 489 #endif
 490
 491 #ifdef CONFIG_MMU
 492 static int vmalloc_open(struct inode *inode, struct file *file)
 493 {
 494         unsigned int *ptr = NULL;
 495         int ret;
 496
 497         if (NUMA_BUILD)
 498                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 499         ret = seq_open(file, &vmalloc_op);
 500         if (!ret) {
 501                 struct seq_file *m = file->private_data;
 502                 m->private = ptr;
 503         } else
 504                 kfree(ptr);
 505         return ret;
 506 }
 507
 508 static const struct file_operations proc_vmalloc_operations = {
 509         .open           = vmalloc_open,
 510         .read           = seq_read,
 511         .llseek         = seq_lseek,
 512         .release        = seq_release_private,
 513 };
 514 #endif
 515
 516 #ifndef arch_irq_stat_cpu
 517 #define arch_irq_stat_cpu(cpu) 0
 518 #endif
 519 #ifndef arch_irq_stat
 520 #define arch_irq_stat() 0
 521 #endif
 522
 523 static int show_stat(struct seq_file *p, void *v)
 524 {
 525         int i, j;
 526         unsigned long jif;
 527         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 528         cputime64_t guest;
 529         u64 sum = 0;
 530         struct timespec boottime;
 531         unsigned int per_irq_sum;
 532
 533         user = nice = system = idle = iowait =
 534                 irq = softirq = steal = cputime64_zero;
 535         guest = cputime64_zero;
 536         getboottime(&boottime);
 537         jif = boottime.tv_sec;
 538
 539         for_each_possible_cpu(i) {
 540                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 541                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 542                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 543                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 544                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 545                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 546                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 547                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 548                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 549
 550                 for_each_irq_nr(j)
 551                         sum += kstat_irqs_cpu(j, i);
 552
 553                 sum += arch_irq_stat_cpu(i);
 554         }
 555         sum += arch_irq_stat();
 556
 557         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 558                 (unsigned long long)cputime64_to_clock_t(user),
 559                 (unsigned long long)cputime64_to_clock_t(nice),
 560                 (unsigned long long)cputime64_to_clock_t(system),
 561                 (unsigned long long)cputime64_to_clock_t(idle),
 562                 (unsigned long long)cputime64_to_clock_t(iowait),
 563                 (unsigned long long)cputime64_to_clock_t(irq),
 564                 (unsigned long long)cputime64_to_clock_t(softirq),
 565                 (unsigned long long)cputime64_to_clock_t(steal),
 566                 (unsigned long long)cputime64_to_clock_t(guest));
 567         for_each_online_cpu(i) {
 568
 569                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 570                 user = kstat_cpu(i).cpustat.user;
 571                 nice = kstat_cpu(i).cpustat.nice;
 572                 system = kstat_cpu(i).cpustat.system;
 573                 idle = kstat_cpu(i).cpustat.idle;
 574                 iowait = kstat_cpu(i).cpustat.iowait;
 575                 irq = kstat_cpu(i).cpustat.irq;
 576                 softirq = kstat_cpu(i).cpustat.softirq;
 577                 steal = kstat_cpu(i).cpustat.steal;
 578                 guest = kstat_cpu(i).cpustat.guest;
 579                 seq_printf(p,
 580                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 581                         i,
 582                         (unsigned long long)cputime64_to_clock_t(user),
 583                         (unsigned long long)cputime64_to_clock_t(nice),
 584                         (unsigned long long)cputime64_to_clock_t(system),
 585                         (unsigned long long)cputime64_to_clock_t(idle),
 586                         (unsigned long long)cputime64_to_clock_t(iowait),
 587                         (unsigned long long)cputime64_to_clock_t(irq),
 588                         (unsigned long long)cputime64_to_clock_t(softirq),
 589                         (unsigned long long)cputime64_to_clock_t(steal),
 590                         (unsigned long long)cputime64_to_clock_t(guest));
 591         }
 592         seq_printf(p, "intr %llu", (unsigned long long)sum);
 593
 594         /* sum again ? it could be updated? */
 595         for_each_irq_nr(j) {
 596                 per_irq_sum = 0;
 597
 598                 for_each_possible_cpu(i)
 599                         per_irq_sum += kstat_irqs_cpu(j, i);
 600
 601                 seq_printf(p, " %u", per_irq_sum);
 602         }
 603
 604         seq_printf(p,
 605                 "\nctxt %llu\n"
 606                 "btime %lu\n"
 607                 "processes %lu\n"
 608                 "procs_running %lu\n"
 609                 "procs_blocked %lu\n",
 610                 nr_context_switches(),
 611                 (unsigned long)jif,
 612                 total_forks,
 613                 nr_running(),
 614                 nr_iowait());
 615
 616         return 0;
 617 }
 618
 619 static int stat_open(struct inode *inode, struct file *file)
 620 {
 621         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 622         char *buf;
 623         struct seq_file *m;
 624         int res;
 625
 626         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 627         if (size > 128 * 1024)
 628                 size = 128 * 1024;
 629         buf = kmalloc(size, GFP_KERNEL);
 630         if (!buf)
 631                 return -ENOMEM;
 632
 633         res = single_open(file, show_stat, NULL);
 634         if (!res) {
 635                 m = file->private_data;
 636                 m->buf = buf;
 637                 m->size = size;
 638         } else
 639                 kfree(buf);
 640         return res;
 641 }
 642 static const struct file_operations proc_stat_operations = {
 643         .open           = stat_open,
 644         .read           = seq_read,
 645         .llseek         = seq_lseek,
 646         .release        = single_release,
 647 };
 648
 649 /*
 650  * /proc/interrupts
 651  */
 652 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 653 {
 654         return (*pos <= nr_irqs) ? pos : NULL;
 655 }
 656
 657
 658 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 659 {
 660         (*pos)++;
 661         return (*pos <= nr_irqs) ? pos : NULL;
 662 }
 663
 664 static void int_seq_stop(struct seq_file *f, void *v)
 665 {
 666         /* Nothing to do */
 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 }