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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / fs / proc / proc_misc.c
blob2d563979cb025412dce7847bd79979c34a8456eb
1 /*
2 * linux/fs/proc/proc_misc.c
3 *
4 * linux/fs/proc/array.c
5 * Copyright (C) 1992 by Linus Torvalds
6 * based on ideas by Darren Senn
7 *
8 * This used to be the part of array.c. See the rest of history and credits
9 * there. I took this into a separate file and switched the thing to generic
10 * proc_file_inode_operations, leaving in array.c only per-process stuff.
11 * Inumbers allocation made dynamic (via create_proc_entry()). AV, May 1999.
12 *
13 * Changes:
14 * Fulton Green : Encapsulated position metric calculations.
15 * <kernel@FultonGreen.com>
16 */
17
18 #include <linux/types.h>
19 #include <linux/errno.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/kernel_stat.h>
23 #include <linux/fs.h>
24 #include <linux/tty.h>
25 #include <linux/string.h>
26 #include <linux/mman.h>
27 #include <linux/proc_fs.h>
28 #include <linux/ioport.h>
29 #include <linux/mm.h>
30 #include <linux/mmzone.h>
31 #include <linux/pagemap.h>
32 #include <linux/interrupt.h>
33 #include <linux/swap.h>
34 #include <linux/slab.h>
35 #include <linux/genhd.h>
36 #include <linux/smp.h>
37 #include <linux/signal.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/seq_file.h>
41 #include <linux/times.h>
42 #include <linux/profile.h>
43 #include <linux/utsname.h>
44 #include <linux/blkdev.h>
45 #include <linux/hugetlb.h>
46 #include <linux/jiffies.h>
47 #include <linux/sysrq.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 extern int get_dma_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 static int meminfo_read_proc(char *page, char **start, off_t off,
127 int count, int *eof, void *data)
128 {
129 struct sysinfo i;
130 int len;
131 unsigned long committed;
132 unsigned long allowed;
133 struct vmalloc_info vmi;
134 long cached;
135
136 /*
137 * display in kilobytes.
138 */
139 #define K(x) ((x) << (PAGE_SHIFT - 10))
140 si_meminfo(&i);
141 si_swapinfo(&i);
142 committed = atomic_read(&vm_committed_space);
143 allowed = ((totalram_pages - hugetlb_total_pages())
144 * sysctl_overcommit_ratio / 100) + total_swap_pages;
145
146 cached = global_page_state(NR_FILE_PAGES) -
147 total_swapcache_pages - i.bufferram;
148 if (cached < 0)
149 cached = 0;
150
151 get_vmalloc_info(&vmi);
152
153 /*
154 * Tagged format, for easy grepping and expansion.
155 */
156 len = sprintf(page,
157 "MemTotal: %8lu kB\n"
158 "MemFree: %8lu kB\n"
159 "Buffers: %8lu kB\n"
160 "Cached: %8lu kB\n"
161 "SwapCached: %8lu kB\n"
162 "Active: %8lu kB\n"
163 "Inactive: %8lu kB\n"
164 #ifdef CONFIG_HIGHMEM
165 "HighTotal: %8lu kB\n"
166 "HighFree: %8lu kB\n"
167 "LowTotal: %8lu kB\n"
168 "LowFree: %8lu kB\n"
169 #endif
170 "SwapTotal: %8lu kB\n"
171 "SwapFree: %8lu kB\n"
172 "Dirty: %8lu kB\n"
173 "Writeback: %8lu kB\n"
174 "AnonPages: %8lu kB\n"
175 "Mapped: %8lu kB\n"
176 "Slab: %8lu kB\n"
177 "SReclaimable: %8lu kB\n"
178 "SUnreclaim: %8lu kB\n"
179 "PageTables: %8lu kB\n"
180 "NFS_Unstable: %8lu kB\n"
181 "Bounce: %8lu kB\n"
182 "CommitLimit: %8lu kB\n"
183 "Committed_AS: %8lu kB\n"
184 "VmallocTotal: %8lu kB\n"
185 "VmallocUsed: %8lu kB\n"
186 "VmallocChunk: %8lu kB\n",
187 K(i.totalram),
188 K(i.freeram),
189 K(i.bufferram),
190 K(cached),
191 K(total_swapcache_pages),
192 K(global_page_state(NR_ACTIVE)),
193 K(global_page_state(NR_INACTIVE)),
194 #ifdef CONFIG_HIGHMEM
195 K(i.totalhigh),
196 K(i.freehigh),
197 K(i.totalram-i.totalhigh),
198 K(i.freeram-i.freehigh),
199 #endif
200 K(i.totalswap),
201 K(i.freeswap),
202 K(global_page_state(NR_FILE_DIRTY)),
203 K(global_page_state(NR_WRITEBACK)),
204 K(global_page_state(NR_ANON_PAGES)),
205 K(global_page_state(NR_FILE_MAPPED)),
206 K(global_page_state(NR_SLAB_RECLAIMABLE) +
207 global_page_state(NR_SLAB_UNRECLAIMABLE)),
208 K(global_page_state(NR_SLAB_RECLAIMABLE)),
209 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
210 K(global_page_state(NR_PAGETABLE)),
211 K(global_page_state(NR_UNSTABLE_NFS)),
212 K(global_page_state(NR_BOUNCE)),
213 K(allowed),
214 K(committed),
215 (unsigned long)VMALLOC_TOTAL >> 10,
216 vmi.used >> 10,
217 vmi.largest_chunk >> 10
218 );
219
220 len += hugetlb_report_meminfo(page + len);
221
222 return proc_calc_metrics(page, start, off, count, eof, len);
223 #undef K
224 }
225
226 extern const struct seq_operations fragmentation_op;
227 static int fragmentation_open(struct inode *inode, struct file *file)
228 {
229 (void)inode;
230 return seq_open(file, &fragmentation_op);
231 }
232
233 static const struct file_operations fragmentation_file_operations = {
234 .open = fragmentation_open,
235 .read = seq_read,
236 .llseek = seq_lseek,
237 .release = seq_release,
238 };
239
240 extern const struct seq_operations pagetypeinfo_op;
241 static int pagetypeinfo_open(struct inode *inode, struct file *file)
242 {
243 return seq_open(file, &pagetypeinfo_op);
244 }
245
246 static const struct file_operations pagetypeinfo_file_ops = {
247 .open = pagetypeinfo_open,
248 .read = seq_read,
249 .llseek = seq_lseek,
250 .release = seq_release,
251 };
252
253 extern const struct seq_operations zoneinfo_op;
254 static int zoneinfo_open(struct inode *inode, struct file *file)
255 {
256 return seq_open(file, &zoneinfo_op);
257 }
258
259 static const struct file_operations proc_zoneinfo_file_operations = {
260 .open = zoneinfo_open,
261 .read = seq_read,
262 .llseek = seq_lseek,
263 .release = seq_release,
264 };
265
266 static int version_read_proc(char *page, char **start, off_t off,
267 int count, int *eof, void *data)
268 {
269 int len;
270
271 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
272 utsname()->sysname,
273 utsname()->release,
274 utsname()->version);
275 return proc_calc_metrics(page, start, off, count, eof, len);
276 }
277
278 extern const struct seq_operations cpuinfo_op;
279 static int cpuinfo_open(struct inode *inode, struct file *file)
280 {
281 return seq_open(file, &cpuinfo_op);
282 }
283
284 static const struct file_operations proc_cpuinfo_operations = {
285 .open = cpuinfo_open,
286 .read = seq_read,
287 .llseek = seq_lseek,
288 .release = seq_release,
289 };
290
291 static int devinfo_show(struct seq_file *f, void *v)
292 {
293 int i = *(loff_t *) v;
294
295 if (i < CHRDEV_MAJOR_HASH_SIZE) {
296 if (i == 0)
297 seq_printf(f, "Character devices:\n");
298 chrdev_show(f, i);
299 }
300 #ifdef CONFIG_BLOCK
301 else {
302 i -= CHRDEV_MAJOR_HASH_SIZE;
303 if (i == 0)
304 seq_printf(f, "\nBlock devices:\n");
305 blkdev_show(f, i);
306 }
307 #endif
308 return 0;
309 }
310
311 static void *devinfo_start(struct seq_file *f, loff_t *pos)
312 {
313 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
314 return pos;
315 return NULL;
316 }
317
318 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
319 {
320 (*pos)++;
321 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
322 return NULL;
323 return pos;
324 }
325
326 static void devinfo_stop(struct seq_file *f, void *v)
327 {
328 /* Nothing to do */
329 }
330
331 static const struct seq_operations devinfo_ops = {
332 .start = devinfo_start,
333 .next = devinfo_next,
334 .stop = devinfo_stop,
335 .show = devinfo_show
336 };
337
338 static int devinfo_open(struct inode *inode, struct file *filp)
339 {
340 return seq_open(filp, &devinfo_ops);
341 }
342
343 static const struct file_operations proc_devinfo_operations = {
344 .open = devinfo_open,
345 .read = seq_read,
346 .llseek = seq_lseek,
347 .release = seq_release,
348 };
349
350 extern const struct seq_operations vmstat_op;
351 static int vmstat_open(struct inode *inode, struct file *file)
352 {
353 return seq_open(file, &vmstat_op);
354 }
355 static const struct file_operations proc_vmstat_file_operations = {
356 .open = vmstat_open,
357 .read = seq_read,
358 .llseek = seq_lseek,
359 .release = seq_release,
360 };
361
362 #ifdef CONFIG_PROC_HARDWARE
363 static int hardware_read_proc(char *page, char **start, off_t off,
364 int count, int *eof, void *data)
365 {
366 int len = get_hardware_list(page);
367 return proc_calc_metrics(page, start, off, count, eof, len);
368 }
369 #endif
370
371 #ifdef CONFIG_STRAM_PROC
372 static int stram_read_proc(char *page, char **start, off_t off,
373 int count, int *eof, void *data)
374 {
375 int len = get_stram_list(page);
376 return proc_calc_metrics(page, start, off, count, eof, len);
377 }
378 #endif
379
380 #ifdef CONFIG_BLOCK
381 static int partitions_open(struct inode *inode, struct file *file)
382 {
383 return seq_open(file, &partitions_op);
384 }
385 static const struct file_operations proc_partitions_operations = {
386 .open = partitions_open,
387 .read = seq_read,
388 .llseek = seq_lseek,
389 .release = seq_release,
390 };
391
392 static int diskstats_open(struct inode *inode, struct file *file)
393 {
394 return seq_open(file, &diskstats_op);
395 }
396 static const struct file_operations proc_diskstats_operations = {
397 .open = diskstats_open,
398 .read = seq_read,
399 .llseek = seq_lseek,
400 .release = seq_release,
401 };
402 #endif
403
404 #ifdef CONFIG_MODULES
405 extern const struct seq_operations modules_op;
406 static int modules_open(struct inode *inode, struct file *file)
407 {
408 return seq_open(file, &modules_op);
409 }
410 static const struct file_operations proc_modules_operations = {
411 .open = modules_open,
412 .read = seq_read,
413 .llseek = seq_lseek,
414 .release = seq_release,
415 };
416 #endif
417
418 #ifdef CONFIG_SLABINFO
419 static int slabinfo_open(struct inode *inode, struct file *file)
420 {
421 return seq_open(file, &slabinfo_op);
422 }
423 static const struct file_operations proc_slabinfo_operations = {
424 .open = slabinfo_open,
425 .read = seq_read,
426 .write = slabinfo_write,
427 .llseek = seq_lseek,
428 .release = seq_release,
429 };
430
431 #ifdef CONFIG_DEBUG_SLAB_LEAK
432 extern const struct seq_operations slabstats_op;
433 static int slabstats_open(struct inode *inode, struct file *file)
434 {
435 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
436 int ret = -ENOMEM;
437 if (n) {
438 ret = seq_open(file, &slabstats_op);
439 if (!ret) {
440 struct seq_file *m = file->private_data;
441 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
442 m->private = n;
443 n = NULL;
444 }
445 kfree(n);
446 }
447 return ret;
448 }
449
450 static const struct file_operations proc_slabstats_operations = {
451 .open = slabstats_open,
452 .read = seq_read,
453 .llseek = seq_lseek,
454 .release = seq_release_private,
455 };
456 #endif
457 #endif
458
459 static int show_stat(struct seq_file *p, void *v)
460 {
461 int i;
462 unsigned long jif;
463 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
464 cputime64_t guest;
465 u64 sum = 0;
466 struct timespec boottime;
467 unsigned int *per_irq_sum;
468
469 per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
470 if (!per_irq_sum)
471 return -ENOMEM;
472
473 user = nice = system = idle = iowait =
474 irq = softirq = steal = cputime64_zero;
475 guest = cputime64_zero;
476 getboottime(&boottime);
477 jif = boottime.tv_sec;
478
479 for_each_possible_cpu(i) {
480 int j;
481
482 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
483 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
484 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
485 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
486 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
487 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
488 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
489 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
490 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
491 for (j = 0; j < NR_IRQS; j++) {
492 unsigned int temp = kstat_cpu(i).irqs[j];
493 sum += temp;
494 per_irq_sum[j] += temp;
495 }
496 }
497
498 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
499 (unsigned long long)cputime64_to_clock_t(user),
500 (unsigned long long)cputime64_to_clock_t(nice),
501 (unsigned long long)cputime64_to_clock_t(system),
502 (unsigned long long)cputime64_to_clock_t(idle),
503 (unsigned long long)cputime64_to_clock_t(iowait),
504 (unsigned long long)cputime64_to_clock_t(irq),
505 (unsigned long long)cputime64_to_clock_t(softirq),
506 (unsigned long long)cputime64_to_clock_t(steal),
507 (unsigned long long)cputime64_to_clock_t(guest));
508 for_each_online_cpu(i) {
509
510 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
511 user = kstat_cpu(i).cpustat.user;
512 nice = kstat_cpu(i).cpustat.nice;
513 system = kstat_cpu(i).cpustat.system;
514 idle = kstat_cpu(i).cpustat.idle;
515 iowait = kstat_cpu(i).cpustat.iowait;
516 irq = kstat_cpu(i).cpustat.irq;
517 softirq = kstat_cpu(i).cpustat.softirq;
518 steal = kstat_cpu(i).cpustat.steal;
519 guest = kstat_cpu(i).cpustat.guest;
520 seq_printf(p,
521 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
522 i,
523 (unsigned long long)cputime64_to_clock_t(user),
524 (unsigned long long)cputime64_to_clock_t(nice),
525 (unsigned long long)cputime64_to_clock_t(system),
526 (unsigned long long)cputime64_to_clock_t(idle),
527 (unsigned long long)cputime64_to_clock_t(iowait),
528 (unsigned long long)cputime64_to_clock_t(irq),
529 (unsigned long long)cputime64_to_clock_t(softirq),
530 (unsigned long long)cputime64_to_clock_t(steal),
531 (unsigned long long)cputime64_to_clock_t(guest));
532 }
533 seq_printf(p, "intr %llu", (unsigned long long)sum);
534
535 for (i = 0; i < NR_IRQS; i++)
536 seq_printf(p, " %u", per_irq_sum[i]);
537
538 seq_printf(p,
539 "\nctxt %llu\n"
540 "btime %lu\n"
541 "processes %lu\n"
542 "procs_running %lu\n"
543 "procs_blocked %lu\n",
544 nr_context_switches(),
545 (unsigned long)jif,
546 total_forks,
547 nr_running(),
548 nr_iowait());
549
550 kfree(per_irq_sum);
551 return 0;
552 }
553
554 static int stat_open(struct inode *inode, struct file *file)
555 {
556 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
557 char *buf;
558 struct seq_file *m;
559 int res;
560
561 /* don't ask for more than the kmalloc() max size, currently 128 KB */
562 if (size > 128 * 1024)
563 size = 128 * 1024;
564 buf = kmalloc(size, GFP_KERNEL);
565 if (!buf)
566 return -ENOMEM;
567
568 res = single_open(file, show_stat, NULL);
569 if (!res) {
570 m = file->private_data;
571 m->buf = buf;
572 m->size = size;
573 } else
574 kfree(buf);
575 return res;
576 }
577 static const struct file_operations proc_stat_operations = {
578 .open = stat_open,
579 .read = seq_read,
580 .llseek = seq_lseek,
581 .release = single_release,
582 };
583
584 /*
585 * /proc/interrupts
586 */
587 static void *int_seq_start(struct seq_file *f, loff_t *pos)
588 {
589 return (*pos <= NR_IRQS) ? pos : NULL;
590 }
591
592 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
593 {
594 (*pos)++;
595 if (*pos > NR_IRQS)
596 return NULL;
597 return pos;
598 }
599
600 static void int_seq_stop(struct seq_file *f, void *v)
601 {
602 /* Nothing to do */
603 }
604
605
606 static const struct seq_operations int_seq_ops = {
607 .start = int_seq_start,
608 .next = int_seq_next,
609 .stop = int_seq_stop,
610 .show = show_interrupts
611 };
612
613 static int interrupts_open(struct inode *inode, struct file *filp)
614 {
615 return seq_open(filp, &int_seq_ops);
616 }
617
618 static const struct file_operations proc_interrupts_operations = {
619 .open = interrupts_open,
620 .read = seq_read,
621 .llseek = seq_lseek,
622 .release = seq_release,
623 };
624
625 static int filesystems_read_proc(char *page, char **start, off_t off,
626 int count, int *eof, void *data)
627 {
628 int len = get_filesystem_list(page);
629 return proc_calc_metrics(page, start, off, count, eof, len);
630 }
631
632 static int cmdline_read_proc(char *page, char **start, off_t off,
633 int count, int *eof, void *data)
634 {
635 int len;
636
637 len = sprintf(page, "%s\n", saved_command_line);
638 return proc_calc_metrics(page, start, off, count, eof, len);
639 }
640
641 static int locks_open(struct inode *inode, struct file *filp)
642 {
643 return seq_open(filp, &locks_seq_operations);
644 }
645
646 static const struct file_operations proc_locks_operations = {
647 .open = locks_open,
648 .read = seq_read,
649 .llseek = seq_lseek,
650 .release = seq_release,
651 };
652
653 static int execdomains_read_proc(char *page, char **start, off_t off,
654 int count, int *eof, void *data)
655 {
656 int len = get_exec_domain_list(page);
657 return proc_calc_metrics(page, start, off, count, eof, len);
658 }
659
660 #ifdef CONFIG_MAGIC_SYSRQ
661 /*
662 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
663 */
664 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
665 size_t count, loff_t *ppos)
666 {
667 if (count) {
668 char c;
669
670 if (get_user(c, buf))
671 return -EFAULT;
672 __handle_sysrq(c, NULL, 0);
673 }
674 return count;
675 }
676
677 static const struct file_operations proc_sysrq_trigger_operations = {
678 .write = write_sysrq_trigger,
679 };
680 #endif
681
682 #ifdef CONFIG_PROC_PAGE_MONITOR
683 #define KPMSIZE sizeof(u64)
684 #define KPMMASK (KPMSIZE - 1)
685 /* /proc/kpagecount - an array exposing page counts
686 *
687 * Each entry is a u64 representing the corresponding
688 * physical page count.
689 */
690 static ssize_t kpagecount_read(struct file *file, char __user *buf,
691 size_t count, loff_t *ppos)
692 {
693 u64 __user *out = (u64 __user *)buf;
694 struct page *ppage;
695 unsigned long src = *ppos;
696 unsigned long pfn;
697 ssize_t ret = 0;
698 u64 pcount;
699
700 pfn = src / KPMSIZE;
701 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
702 if (src & KPMMASK || count & KPMMASK)
703 return -EIO;
704
705 while (count > 0) {
706 ppage = NULL;
707 if (pfn_valid(pfn))
708 ppage = pfn_to_page(pfn);
709 pfn++;
710 if (!ppage)
711 pcount = 0;
712 else
713 pcount = atomic_read(&ppage->_count);
714
715 if (put_user(pcount, out++)) {
716 ret = -EFAULT;
717 break;
718 }
719
720 count -= KPMSIZE;
721 }
722
723 *ppos += (char __user *)out - buf;
724 if (!ret)
725 ret = (char __user *)out - buf;
726 return ret;
727 }
728
729 static struct file_operations proc_kpagecount_operations = {
730 .llseek = mem_lseek,
731 .read = kpagecount_read,
732 };
733
734 /* /proc/kpageflags - an array exposing page flags
735 *
736 * Each entry is a u64 representing the corresponding
737 * physical page flags.
738 */
739
740 /* These macros are used to decouple internal flags from exported ones */
741
742 #define KPF_LOCKED 0
743 #define KPF_ERROR 1
744 #define KPF_REFERENCED 2
745 #define KPF_UPTODATE 3
746 #define KPF_DIRTY 4
747 #define KPF_LRU 5
748 #define KPF_ACTIVE 6
749 #define KPF_SLAB 7
750 #define KPF_WRITEBACK 8
751 #define KPF_RECLAIM 9
752 #define KPF_BUDDY 10
753
754 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
755
756 static ssize_t kpageflags_read(struct file *file, char __user *buf,
757 size_t count, loff_t *ppos)
758 {
759 u64 __user *out = (u64 __user *)buf;
760 struct page *ppage;
761 unsigned long src = *ppos;
762 unsigned long pfn;
763 ssize_t ret = 0;
764 u64 kflags, uflags;
765
766 pfn = src / KPMSIZE;
767 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
768 if (src & KPMMASK || count & KPMMASK)
769 return -EIO;
770
771 while (count > 0) {
772 ppage = NULL;
773 if (pfn_valid(pfn))
774 ppage = pfn_to_page(pfn);
775 pfn++;
776 if (!ppage)
777 kflags = 0;
778 else
779 kflags = ppage->flags;
780
781 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
782 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
783 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
784 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
785 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
786 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
787 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
788 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
789 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
790 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
791 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
792
793 if (put_user(uflags, out++)) {
794 ret = -EFAULT;
795 break;
796 }
797
798 count -= KPMSIZE;
799 }
800
801 *ppos += (char __user *)out - buf;
802 if (!ret)
803 ret = (char __user *)out - buf;
804 return ret;
805 }
806
807 static struct file_operations proc_kpageflags_operations = {
808 .llseek = mem_lseek,
809 .read = kpageflags_read,
810 };
811 #endif /* CONFIG_PROC_PAGE_MONITOR */
812
813 struct proc_dir_entry *proc_root_kcore;
814
815 void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
816 {
817 struct proc_dir_entry *entry;
818 entry = create_proc_entry(name, mode, NULL);
819 if (entry)
820 entry->proc_fops = f;
821 }
822
823 void __init proc_misc_init(void)
824 {
825 static struct {
826 char *name;
827 int (*read_proc)(char*,char**,off_t,int,int*,void*);
828 } *p, simple_ones[] = {
829 {"loadavg", loadavg_read_proc},
830 {"uptime", uptime_read_proc},
831 {"meminfo", meminfo_read_proc},
832 {"version", version_read_proc},
833 #ifdef CONFIG_PROC_HARDWARE
834 {"hardware", hardware_read_proc},
835 #endif
836 #ifdef CONFIG_STRAM_PROC
837 {"stram", stram_read_proc},
838 #endif
839 {"filesystems", filesystems_read_proc},
840 {"cmdline", cmdline_read_proc},
841 {"execdomains", execdomains_read_proc},
842 {NULL,}
843 };
844 for (p = simple_ones; p->name; p++)
845 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
846
847 proc_symlink("mounts", NULL, "self/mounts");
848
849 /* And now for trickier ones */
850 #ifdef CONFIG_PRINTK
851 {
852 struct proc_dir_entry *entry;
853 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
854 if (entry)
855 entry->proc_fops = &proc_kmsg_operations;
856 }
857 #endif
858 create_seq_entry("locks", 0, &proc_locks_operations);
859 create_seq_entry("devices", 0, &proc_devinfo_operations);
860 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
861 #ifdef CONFIG_BLOCK
862 create_seq_entry("partitions", 0, &proc_partitions_operations);
863 #endif
864 create_seq_entry("stat", 0, &proc_stat_operations);
865 create_seq_entry("interrupts", 0, &proc_interrupts_operations);
866 #ifdef CONFIG_SLABINFO
867 create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
868 #ifdef CONFIG_DEBUG_SLAB_LEAK
869 create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
870 #endif
871 #endif
872 create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
873 create_seq_entry("pagetypeinfo", S_IRUGO, &pagetypeinfo_file_ops);
874 create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
875 create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
876 #ifdef CONFIG_BLOCK
877 create_seq_entry("diskstats", 0, &proc_diskstats_operations);
878 #endif
879 #ifdef CONFIG_MODULES
880 create_seq_entry("modules", 0, &proc_modules_operations);
881 #endif
882 #ifdef CONFIG_SCHEDSTATS
883 create_seq_entry("schedstat", 0, &proc_schedstat_operations);
884 #endif
885 #ifdef CONFIG_PROC_KCORE
886 proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
887 if (proc_root_kcore) {
888 proc_root_kcore->proc_fops = &proc_kcore_operations;
889 proc_root_kcore->size =
890 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
891 }
892 #endif
893 #ifdef CONFIG_PROC_PAGE_MONITOR
894 create_seq_entry("kpagecount", S_IRUSR, &proc_kpagecount_operations);
895 create_seq_entry("kpageflags", S_IRUSR, &proc_kpageflags_operations);
896 #endif
897 #ifdef CONFIG_PROC_VMCORE
898 proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
899 if (proc_vmcore)
900 proc_vmcore->proc_fops = &proc_vmcore_operations;
901 #endif
902 #ifdef CONFIG_MAGIC_SYSRQ
903 {
904 struct proc_dir_entry *entry;
905 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
906 if (entry)
907 entry->proc_fops = &proc_sysrq_trigger_operations;
908 }
909 #endif
910 }
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