[libata] LBA28/LBA48 off-by-one bug in ata.h
[linux-3.10.git] / 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/sysrq.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 extern int get_dma_list(char *);
72
73 static int proc_calc_metrics(char *page, char **start, off_t off,
74                                  int count, int *eof, int len)
75 {
76         if (len <= off+count) *eof = 1;
77         *start = page + off;
78         len -= off;
79         if (len>count) len = count;
80         if (len<0) len = 0;
81         return len;
82 }
83
84 static int loadavg_read_proc(char *page, char **start, off_t off,
85                                  int count, int *eof, void *data)
86 {
87         int a, b, c;
88         int len;
89         unsigned long seq;
90
91         do {
92                 seq = read_seqbegin(&xtime_lock);
93                 a = avenrun[0] + (FIXED_1/200);
94                 b = avenrun[1] + (FIXED_1/200);
95                 c = avenrun[2] + (FIXED_1/200);
96         } while (read_seqretry(&xtime_lock, seq));
97
98         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
99                 LOAD_INT(a), LOAD_FRAC(a),
100                 LOAD_INT(b), LOAD_FRAC(b),
101                 LOAD_INT(c), LOAD_FRAC(c),
102                 nr_running(), nr_threads,
103                 task_active_pid_ns(current)->last_pid);
104         return proc_calc_metrics(page, start, off, count, eof, len);
105 }
106
107 static int uptime_read_proc(char *page, char **start, off_t off,
108                                  int count, int *eof, void *data)
109 {
110         struct timespec uptime;
111         struct timespec idle;
112         int len;
113         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
114
115         do_posix_clock_monotonic_gettime(&uptime);
116         monotonic_to_bootbased(&uptime);
117         cputime_to_timespec(idletime, &idle);
118         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
119                         (unsigned long) uptime.tv_sec,
120                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
121                         (unsigned long) idle.tv_sec,
122                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
123
124         return proc_calc_metrics(page, start, off, count, eof, len);
125 }
126
127 int __attribute__((weak)) arch_report_meminfo(char *page)
128 {
129         return 0;
130 }
131
132 static int meminfo_read_proc(char *page, char **start, off_t off,
133                                  int count, int *eof, void *data)
134 {
135         struct sysinfo i;
136         int len;
137         unsigned long committed;
138         unsigned long allowed;
139         struct vmalloc_info vmi;
140         long cached;
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         /*
160          * Tagged format, for easy grepping and expansion.
161          */
162         len = sprintf(page,
163                 "MemTotal:     %8lu kB\n"
164                 "MemFree:      %8lu kB\n"
165                 "Buffers:      %8lu kB\n"
166                 "Cached:       %8lu kB\n"
167                 "SwapCached:   %8lu kB\n"
168                 "Active:       %8lu kB\n"
169                 "Inactive:     %8lu kB\n"
170 #ifdef CONFIG_HIGHMEM
171                 "HighTotal:    %8lu kB\n"
172                 "HighFree:     %8lu kB\n"
173                 "LowTotal:     %8lu kB\n"
174                 "LowFree:      %8lu kB\n"
175 #endif
176                 "SwapTotal:    %8lu kB\n"
177                 "SwapFree:     %8lu kB\n"
178                 "Dirty:        %8lu kB\n"
179                 "Writeback:    %8lu kB\n"
180                 "AnonPages:    %8lu kB\n"
181                 "Mapped:       %8lu kB\n"
182                 "Slab:         %8lu kB\n"
183                 "SReclaimable: %8lu kB\n"
184                 "SUnreclaim:   %8lu kB\n"
185                 "PageTables:   %8lu kB\n"
186                 "NFS_Unstable: %8lu kB\n"
187                 "Bounce:       %8lu kB\n"
188                 "WritebackTmp: %8lu kB\n"
189                 "CommitLimit:  %8lu kB\n"
190                 "Committed_AS: %8lu kB\n"
191                 "VmallocTotal: %8lu kB\n"
192                 "VmallocUsed:  %8lu kB\n"
193                 "VmallocChunk: %8lu kB\n"
194                 "Quicklists:   %8lu kB\n",
195                 K(i.totalram),
196                 K(i.freeram),
197                 K(i.bufferram),
198                 K(cached),
199                 K(total_swapcache_pages),
200                 K(global_page_state(NR_ACTIVE)),
201                 K(global_page_state(NR_INACTIVE)),
202 #ifdef CONFIG_HIGHMEM
203                 K(i.totalhigh),
204                 K(i.freehigh),
205                 K(i.totalram-i.totalhigh),
206                 K(i.freeram-i.freehigh),
207 #endif
208                 K(i.totalswap),
209                 K(i.freeswap),
210                 K(global_page_state(NR_FILE_DIRTY)),
211                 K(global_page_state(NR_WRITEBACK)),
212                 K(global_page_state(NR_ANON_PAGES)),
213                 K(global_page_state(NR_FILE_MAPPED)),
214                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
215                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
216                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
217                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
218                 K(global_page_state(NR_PAGETABLE)),
219                 K(global_page_state(NR_UNSTABLE_NFS)),
220                 K(global_page_state(NR_BOUNCE)),
221                 K(global_page_state(NR_WRITEBACK_TEMP)),
222                 K(allowed),
223                 K(committed),
224                 (unsigned long)VMALLOC_TOTAL >> 10,
225                 vmi.used >> 10,
226                 vmi.largest_chunk >> 10,
227                 K(quicklist_total_size())
228                 );
229
230                 len += hugetlb_report_meminfo(page + len);
231
232         len += arch_report_meminfo(page + len);
233
234         return proc_calc_metrics(page, start, off, count, eof, len);
235 #undef K
236 }
237
238 static int fragmentation_open(struct inode *inode, struct file *file)
239 {
240         (void)inode;
241         return seq_open(file, &fragmentation_op);
242 }
243
244 static const struct file_operations fragmentation_file_operations = {
245         .open           = fragmentation_open,
246         .read           = seq_read,
247         .llseek         = seq_lseek,
248         .release        = seq_release,
249 };
250
251 static int pagetypeinfo_open(struct inode *inode, struct file *file)
252 {
253         return seq_open(file, &pagetypeinfo_op);
254 }
255
256 static const struct file_operations pagetypeinfo_file_ops = {
257         .open           = pagetypeinfo_open,
258         .read           = seq_read,
259         .llseek         = seq_lseek,
260         .release        = seq_release,
261 };
262
263 static int zoneinfo_open(struct inode *inode, struct file *file)
264 {
265         return seq_open(file, &zoneinfo_op);
266 }
267
268 static const struct file_operations proc_zoneinfo_file_operations = {
269         .open           = zoneinfo_open,
270         .read           = seq_read,
271         .llseek         = seq_lseek,
272         .release        = seq_release,
273 };
274
275 static int version_read_proc(char *page, char **start, off_t off,
276                                  int count, int *eof, void *data)
277 {
278         int len;
279
280         len = snprintf(page, PAGE_SIZE, linux_proc_banner,
281                 utsname()->sysname,
282                 utsname()->release,
283                 utsname()->version);
284         return proc_calc_metrics(page, start, off, count, eof, len);
285 }
286
287 extern const struct seq_operations cpuinfo_op;
288 static int cpuinfo_open(struct inode *inode, struct file *file)
289 {
290         return seq_open(file, &cpuinfo_op);
291 }
292
293 static const struct file_operations proc_cpuinfo_operations = {
294         .open           = cpuinfo_open,
295         .read           = seq_read,
296         .llseek         = seq_lseek,
297         .release        = seq_release,
298 };
299
300 static int devinfo_show(struct seq_file *f, void *v)
301 {
302         int i = *(loff_t *) v;
303
304         if (i < CHRDEV_MAJOR_HASH_SIZE) {
305                 if (i == 0)
306                         seq_printf(f, "Character devices:\n");
307                 chrdev_show(f, i);
308         }
309 #ifdef CONFIG_BLOCK
310         else {
311                 i -= CHRDEV_MAJOR_HASH_SIZE;
312                 if (i == 0)
313                         seq_printf(f, "\nBlock devices:\n");
314                 blkdev_show(f, i);
315         }
316 #endif
317         return 0;
318 }
319
320 static void *devinfo_start(struct seq_file *f, loff_t *pos)
321 {
322         if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
323                 return pos;
324         return NULL;
325 }
326
327 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
328 {
329         (*pos)++;
330         if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
331                 return NULL;
332         return pos;
333 }
334
335 static void devinfo_stop(struct seq_file *f, void *v)
336 {
337         /* Nothing to do */
338 }
339
340 static const struct seq_operations devinfo_ops = {
341         .start = devinfo_start,
342         .next  = devinfo_next,
343         .stop  = devinfo_stop,
344         .show  = devinfo_show
345 };
346
347 static int devinfo_open(struct inode *inode, struct file *filp)
348 {
349         return seq_open(filp, &devinfo_ops);
350 }
351
352 static const struct file_operations proc_devinfo_operations = {
353         .open           = devinfo_open,
354         .read           = seq_read,
355         .llseek         = seq_lseek,
356         .release        = seq_release,
357 };
358
359 static int vmstat_open(struct inode *inode, struct file *file)
360 {
361         return seq_open(file, &vmstat_op);
362 }
363 static const struct file_operations proc_vmstat_file_operations = {
364         .open           = vmstat_open,
365         .read           = seq_read,
366         .llseek         = seq_lseek,
367         .release        = seq_release,
368 };
369
370 #ifdef CONFIG_PROC_HARDWARE
371 static int hardware_read_proc(char *page, char **start, off_t off,
372                                  int count, int *eof, void *data)
373 {
374         int len = get_hardware_list(page);
375         return proc_calc_metrics(page, start, off, count, eof, len);
376 }
377 #endif
378
379 #ifdef CONFIG_STRAM_PROC
380 static int stram_read_proc(char *page, char **start, off_t off,
381                                  int count, int *eof, void *data)
382 {
383         int len = get_stram_list(page);
384         return proc_calc_metrics(page, start, off, count, eof, len);
385 }
386 #endif
387
388 #ifdef CONFIG_BLOCK
389 static int partitions_open(struct inode *inode, struct file *file)
390 {
391         return seq_open(file, &partitions_op);
392 }
393 static const struct file_operations proc_partitions_operations = {
394         .open           = partitions_open,
395         .read           = seq_read,
396         .llseek         = seq_lseek,
397         .release        = seq_release,
398 };
399
400 static int diskstats_open(struct inode *inode, struct file *file)
401 {
402         return seq_open(file, &diskstats_op);
403 }
404 static const struct file_operations proc_diskstats_operations = {
405         .open           = diskstats_open,
406         .read           = seq_read,
407         .llseek         = seq_lseek,
408         .release        = seq_release,
409 };
410 #endif
411
412 #ifdef CONFIG_MODULES
413 extern const struct seq_operations modules_op;
414 static int modules_open(struct inode *inode, struct file *file)
415 {
416         return seq_open(file, &modules_op);
417 }
418 static const struct file_operations proc_modules_operations = {
419         .open           = modules_open,
420         .read           = seq_read,
421         .llseek         = seq_lseek,
422         .release        = seq_release,
423 };
424 #endif
425
426 #ifdef CONFIG_SLABINFO
427 static int slabinfo_open(struct inode *inode, struct file *file)
428 {
429         return seq_open(file, &slabinfo_op);
430 }
431 static const struct file_operations proc_slabinfo_operations = {
432         .open           = slabinfo_open,
433         .read           = seq_read,
434         .write          = slabinfo_write,
435         .llseek         = seq_lseek,
436         .release        = seq_release,
437 };
438
439 #ifdef CONFIG_DEBUG_SLAB_LEAK
440 extern const struct seq_operations slabstats_op;
441 static int slabstats_open(struct inode *inode, struct file *file)
442 {
443         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
444         int ret = -ENOMEM;
445         if (n) {
446                 ret = seq_open(file, &slabstats_op);
447                 if (!ret) {
448                         struct seq_file *m = file->private_data;
449                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
450                         m->private = n;
451                         n = NULL;
452                 }
453                 kfree(n);
454         }
455         return ret;
456 }
457
458 static const struct file_operations proc_slabstats_operations = {
459         .open           = slabstats_open,
460         .read           = seq_read,
461         .llseek         = seq_lseek,
462         .release        = seq_release_private,
463 };
464 #endif
465 #endif
466
467 #ifdef CONFIG_MMU
468 static int vmalloc_open(struct inode *inode, struct file *file)
469 {
470         unsigned int *ptr = NULL;
471         int ret;
472
473         if (NUMA_BUILD)
474                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
475         ret = seq_open(file, &vmalloc_op);
476         if (!ret) {
477                 struct seq_file *m = file->private_data;
478                 m->private = ptr;
479         } else
480                 kfree(ptr);
481         return ret;
482 }
483
484 static const struct file_operations proc_vmalloc_operations = {
485         .open           = vmalloc_open,
486         .read           = seq_read,
487         .llseek         = seq_lseek,
488         .release        = seq_release_private,
489 };
490 #endif
491
492 #ifndef arch_irq_stat_cpu
493 #define arch_irq_stat_cpu(cpu) 0
494 #endif
495 #ifndef arch_irq_stat
496 #define arch_irq_stat() 0
497 #endif
498
499 static int show_stat(struct seq_file *p, void *v)
500 {
501         int i;
502         unsigned long jif;
503         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
504         cputime64_t guest;
505         u64 sum = 0;
506         struct timespec boottime;
507         unsigned int *per_irq_sum;
508
509         per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
510         if (!per_irq_sum)
511                 return -ENOMEM;
512
513         user = nice = system = idle = iowait =
514                 irq = softirq = steal = cputime64_zero;
515         guest = cputime64_zero;
516         getboottime(&boottime);
517         jif = boottime.tv_sec;
518
519         for_each_possible_cpu(i) {
520                 int j;
521
522                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
523                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
524                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
525                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
526                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
527                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
528                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
529                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
530                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
531                 for (j = 0; j < NR_IRQS; j++) {
532                         unsigned int temp = kstat_cpu(i).irqs[j];
533                         sum += temp;
534                         per_irq_sum[j] += temp;
535                 }
536                 sum += arch_irq_stat_cpu(i);
537         }
538         sum += arch_irq_stat();
539
540         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
541                 (unsigned long long)cputime64_to_clock_t(user),
542                 (unsigned long long)cputime64_to_clock_t(nice),
543                 (unsigned long long)cputime64_to_clock_t(system),
544                 (unsigned long long)cputime64_to_clock_t(idle),
545                 (unsigned long long)cputime64_to_clock_t(iowait),
546                 (unsigned long long)cputime64_to_clock_t(irq),
547                 (unsigned long long)cputime64_to_clock_t(softirq),
548                 (unsigned long long)cputime64_to_clock_t(steal),
549                 (unsigned long long)cputime64_to_clock_t(guest));
550         for_each_online_cpu(i) {
551
552                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
553                 user = kstat_cpu(i).cpustat.user;
554                 nice = kstat_cpu(i).cpustat.nice;
555                 system = kstat_cpu(i).cpustat.system;
556                 idle = kstat_cpu(i).cpustat.idle;
557                 iowait = kstat_cpu(i).cpustat.iowait;
558                 irq = kstat_cpu(i).cpustat.irq;
559                 softirq = kstat_cpu(i).cpustat.softirq;
560                 steal = kstat_cpu(i).cpustat.steal;
561                 guest = kstat_cpu(i).cpustat.guest;
562                 seq_printf(p,
563                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
564                         i,
565                         (unsigned long long)cputime64_to_clock_t(user),
566                         (unsigned long long)cputime64_to_clock_t(nice),
567                         (unsigned long long)cputime64_to_clock_t(system),
568                         (unsigned long long)cputime64_to_clock_t(idle),
569                         (unsigned long long)cputime64_to_clock_t(iowait),
570                         (unsigned long long)cputime64_to_clock_t(irq),
571                         (unsigned long long)cputime64_to_clock_t(softirq),
572                         (unsigned long long)cputime64_to_clock_t(steal),
573                         (unsigned long long)cputime64_to_clock_t(guest));
574         }
575         seq_printf(p, "intr %llu", (unsigned long long)sum);
576
577         for (i = 0; i < NR_IRQS; i++)
578                 seq_printf(p, " %u", per_irq_sum[i]);
579
580         seq_printf(p,
581                 "\nctxt %llu\n"
582                 "btime %lu\n"
583                 "processes %lu\n"
584                 "procs_running %lu\n"
585                 "procs_blocked %lu\n",
586                 nr_context_switches(),
587                 (unsigned long)jif,
588                 total_forks,
589                 nr_running(),
590                 nr_iowait());
591
592         kfree(per_irq_sum);
593         return 0;
594 }
595
596 static int stat_open(struct inode *inode, struct file *file)
597 {
598         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
599         char *buf;
600         struct seq_file *m;
601         int res;
602
603         /* don't ask for more than the kmalloc() max size, currently 128 KB */
604         if (size > 128 * 1024)
605                 size = 128 * 1024;
606         buf = kmalloc(size, GFP_KERNEL);
607         if (!buf)
608                 return -ENOMEM;
609
610         res = single_open(file, show_stat, NULL);
611         if (!res) {
612                 m = file->private_data;
613                 m->buf = buf;
614                 m->size = size;
615         } else
616                 kfree(buf);
617         return res;
618 }
619 static const struct file_operations proc_stat_operations = {
620         .open           = stat_open,
621         .read           = seq_read,
622         .llseek         = seq_lseek,
623         .release        = single_release,
624 };
625
626 /*
627  * /proc/interrupts
628  */
629 static void *int_seq_start(struct seq_file *f, loff_t *pos)
630 {
631         return (*pos <= NR_IRQS) ? pos : NULL;
632 }
633
634 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
635 {
636         (*pos)++;
637         if (*pos > NR_IRQS)
638                 return NULL;
639         return pos;
640 }
641
642 static void int_seq_stop(struct seq_file *f, void *v)
643 {
644         /* Nothing to do */
645 }
646
647
648 static const struct seq_operations int_seq_ops = {
649         .start = int_seq_start,
650         .next  = int_seq_next,
651         .stop  = int_seq_stop,
652         .show  = show_interrupts
653 };
654
655 static int interrupts_open(struct inode *inode, struct file *filp)
656 {
657         return seq_open(filp, &int_seq_ops);
658 }
659
660 static const struct file_operations proc_interrupts_operations = {
661         .open           = interrupts_open,
662         .read           = seq_read,
663         .llseek         = seq_lseek,
664         .release        = seq_release,
665 };
666
667 static int filesystems_read_proc(char *page, char **start, off_t off,
668                                  int count, int *eof, void *data)
669 {
670         int len = get_filesystem_list(page);
671         return proc_calc_metrics(page, start, off, count, eof, len);
672 }
673
674 static int cmdline_read_proc(char *page, char **start, off_t off,
675                                  int count, int *eof, void *data)
676 {
677         int len;
678
679         len = sprintf(page, "%s\n", saved_command_line);
680         return proc_calc_metrics(page, start, off, count, eof, len);
681 }
682
683 static int locks_open(struct inode *inode, struct file *filp)
684 {
685         return seq_open(filp, &locks_seq_operations);
686 }
687
688 static const struct file_operations proc_locks_operations = {
689         .open           = locks_open,
690         .read           = seq_read,
691         .llseek         = seq_lseek,
692         .release        = seq_release,
693 };
694
695 static int execdomains_read_proc(char *page, char **start, off_t off,
696                                  int count, int *eof, void *data)
697 {
698         int len = get_exec_domain_list(page);
699         return proc_calc_metrics(page, start, off, count, eof, len);
700 }
701
702 #ifdef CONFIG_MAGIC_SYSRQ
703 /*
704  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
705  */
706 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
707                                    size_t count, loff_t *ppos)
708 {
709         if (count) {
710                 char c;
711
712                 if (get_user(c, buf))
713                         return -EFAULT;
714                 __handle_sysrq(c, NULL, 0);
715         }
716         return count;
717 }
718
719 static const struct file_operations proc_sysrq_trigger_operations = {
720         .write          = write_sysrq_trigger,
721 };
722 #endif
723
724 #ifdef CONFIG_PROC_PAGE_MONITOR
725 #define KPMSIZE sizeof(u64)
726 #define KPMMASK (KPMSIZE - 1)
727 /* /proc/kpagecount - an array exposing page counts
728  *
729  * Each entry is a u64 representing the corresponding
730  * physical page count.
731  */
732 static ssize_t kpagecount_read(struct file *file, char __user *buf,
733                              size_t count, loff_t *ppos)
734 {
735         u64 __user *out = (u64 __user *)buf;
736         struct page *ppage;
737         unsigned long src = *ppos;
738         unsigned long pfn;
739         ssize_t ret = 0;
740         u64 pcount;
741
742         pfn = src / KPMSIZE;
743         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
744         if (src & KPMMASK || count & KPMMASK)
745                 return -EINVAL;
746
747         while (count > 0) {
748                 ppage = NULL;
749                 if (pfn_valid(pfn))
750                         ppage = pfn_to_page(pfn);
751                 pfn++;
752                 if (!ppage)
753                         pcount = 0;
754                 else
755                         pcount = page_mapcount(ppage);
756
757                 if (put_user(pcount, out++)) {
758                         ret = -EFAULT;
759                         break;
760                 }
761
762                 count -= KPMSIZE;
763         }
764
765         *ppos += (char __user *)out - buf;
766         if (!ret)
767                 ret = (char __user *)out - buf;
768         return ret;
769 }
770
771 static struct file_operations proc_kpagecount_operations = {
772         .llseek = mem_lseek,
773         .read = kpagecount_read,
774 };
775
776 /* /proc/kpageflags - an array exposing page flags
777  *
778  * Each entry is a u64 representing the corresponding
779  * physical page flags.
780  */
781
782 /* These macros are used to decouple internal flags from exported ones */
783
784 #define KPF_LOCKED     0
785 #define KPF_ERROR      1
786 #define KPF_REFERENCED 2
787 #define KPF_UPTODATE   3
788 #define KPF_DIRTY      4
789 #define KPF_LRU        5
790 #define KPF_ACTIVE     6
791 #define KPF_SLAB       7
792 #define KPF_WRITEBACK  8
793 #define KPF_RECLAIM    9
794 #define KPF_BUDDY     10
795
796 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
797
798 static ssize_t kpageflags_read(struct file *file, char __user *buf,
799                              size_t count, loff_t *ppos)
800 {
801         u64 __user *out = (u64 __user *)buf;
802         struct page *ppage;
803         unsigned long src = *ppos;
804         unsigned long pfn;
805         ssize_t ret = 0;
806         u64 kflags, uflags;
807
808         pfn = src / KPMSIZE;
809         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
810         if (src & KPMMASK || count & KPMMASK)
811                 return -EINVAL;
812
813         while (count > 0) {
814                 ppage = NULL;
815                 if (pfn_valid(pfn))
816                         ppage = pfn_to_page(pfn);
817                 pfn++;
818                 if (!ppage)
819                         kflags = 0;
820                 else
821                         kflags = ppage->flags;
822
823                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
824                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
825                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
826                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
827                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
828                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
829                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
830                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
831                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
832                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
833                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
834
835                 if (put_user(uflags, out++)) {
836                         ret = -EFAULT;
837                         break;
838                 }
839
840                 count -= KPMSIZE;
841         }
842
843         *ppos += (char __user *)out - buf;
844         if (!ret)
845                 ret = (char __user *)out - buf;
846         return ret;
847 }
848
849 static struct file_operations proc_kpageflags_operations = {
850         .llseek = mem_lseek,
851         .read = kpageflags_read,
852 };
853 #endif /* CONFIG_PROC_PAGE_MONITOR */
854
855 struct proc_dir_entry *proc_root_kcore;
856
857 void __init proc_misc_init(void)
858 {
859         static struct {
860                 char *name;
861                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
862         } *p, simple_ones[] = {
863                 {"loadavg",     loadavg_read_proc},
864                 {"uptime",      uptime_read_proc},
865                 {"meminfo",     meminfo_read_proc},
866                 {"version",     version_read_proc},
867 #ifdef CONFIG_PROC_HARDWARE
868                 {"hardware",    hardware_read_proc},
869 #endif
870 #ifdef CONFIG_STRAM_PROC
871                 {"stram",       stram_read_proc},
872 #endif
873                 {"filesystems", filesystems_read_proc},
874                 {"cmdline",     cmdline_read_proc},
875                 {"execdomains", execdomains_read_proc},
876                 {NULL,}
877         };
878         for (p = simple_ones; p->name; p++)
879                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
880
881         proc_symlink("mounts", NULL, "self/mounts");
882
883         /* And now for trickier ones */
884 #ifdef CONFIG_PRINTK
885         proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
886 #endif
887         proc_create("locks", 0, NULL, &proc_locks_operations);
888         proc_create("devices", 0, NULL, &proc_devinfo_operations);
889         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
890 #ifdef CONFIG_BLOCK
891         proc_create("partitions", 0, NULL, &proc_partitions_operations);
892 #endif
893         proc_create("stat", 0, NULL, &proc_stat_operations);
894         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
895 #ifdef CONFIG_SLABINFO
896         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
897 #ifdef CONFIG_DEBUG_SLAB_LEAK
898         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
899 #endif
900 #endif
901 #ifdef CONFIG_MMU
902         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
903 #endif
904         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
905         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
906         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
907         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
908 #ifdef CONFIG_BLOCK
909         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
910 #endif
911 #ifdef CONFIG_MODULES
912         proc_create("modules", 0, NULL, &proc_modules_operations);
913 #endif
914 #ifdef CONFIG_SCHEDSTATS
915         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
916 #endif
917 #ifdef CONFIG_PROC_KCORE
918         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
919         if (proc_root_kcore)
920                 proc_root_kcore->size =
921                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
922 #endif
923 #ifdef CONFIG_PROC_PAGE_MONITOR
924         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
925         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
926 #endif
927 #ifdef CONFIG_PROC_VMCORE
928         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
929 #endif
930 #ifdef CONFIG_MAGIC_SYSRQ
931         proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
932 #endif
933 }