projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[deliverable/linux.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 #ifdef CONFIG_QUICKLIST
187 "Quicklists: %8lu kB\n"
188 #endif
189 "NFS_Unstable: %8lu kB\n"
190 "Bounce: %8lu kB\n"
191 "WritebackTmp: %8lu kB\n"
192 "CommitLimit: %8lu kB\n"
193 "Committed_AS: %8lu kB\n"
194 "VmallocTotal: %8lu kB\n"
195 "VmallocUsed: %8lu kB\n"
196 "VmallocChunk: %8lu kB\n",
197 K(i.totalram),
198 K(i.freeram),
199 K(i.bufferram),
200 K(cached),
201 K(total_swapcache_pages),
202 K(global_page_state(NR_ACTIVE)),
203 K(global_page_state(NR_INACTIVE)),
204 #ifdef CONFIG_HIGHMEM
205 K(i.totalhigh),
206 K(i.freehigh),
207 K(i.totalram-i.totalhigh),
208 K(i.freeram-i.freehigh),
209 #endif
210 K(i.totalswap),
211 K(i.freeswap),
212 K(global_page_state(NR_FILE_DIRTY)),
213 K(global_page_state(NR_WRITEBACK)),
214 K(global_page_state(NR_ANON_PAGES)),
215 K(global_page_state(NR_FILE_MAPPED)),
216 K(global_page_state(NR_SLAB_RECLAIMABLE) +
217 global_page_state(NR_SLAB_UNRECLAIMABLE)),
218 K(global_page_state(NR_SLAB_RECLAIMABLE)),
219 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
220 K(global_page_state(NR_PAGETABLE)),
221 #ifdef CONFIG_QUICKLIST
222 K(quicklist_total_size()),
223 #endif
224 K(global_page_state(NR_UNSTABLE_NFS)),
225 K(global_page_state(NR_BOUNCE)),
226 K(global_page_state(NR_WRITEBACK_TEMP)),
227 K(allowed),
228 K(committed),
229 (unsigned long)VMALLOC_TOTAL >> 10,
230 vmi.used >> 10,
231 vmi.largest_chunk >> 10
232 );
233
234 len += hugetlb_report_meminfo(page + len);
235
236 len += arch_report_meminfo(page + len);
237
238 return proc_calc_metrics(page, start, off, count, eof, len);
239 #undef K
240 }
241
242 static int fragmentation_open(struct inode *inode, struct file *file)
243 {
244 (void)inode;
245 return seq_open(file, &fragmentation_op);
246 }
247
248 static const struct file_operations fragmentation_file_operations = {
249 .open = fragmentation_open,
250 .read = seq_read,
251 .llseek = seq_lseek,
252 .release = seq_release,
253 };
254
255 static int pagetypeinfo_open(struct inode *inode, struct file *file)
256 {
257 return seq_open(file, &pagetypeinfo_op);
258 }
259
260 static const struct file_operations pagetypeinfo_file_ops = {
261 .open = pagetypeinfo_open,
262 .read = seq_read,
263 .llseek = seq_lseek,
264 .release = seq_release,
265 };
266
267 static int zoneinfo_open(struct inode *inode, struct file *file)
268 {
269 return seq_open(file, &zoneinfo_op);
270 }
271
272 static const struct file_operations proc_zoneinfo_file_operations = {
273 .open = zoneinfo_open,
274 .read = seq_read,
275 .llseek = seq_lseek,
276 .release = seq_release,
277 };
278
279 static int version_read_proc(char *page, char **start, off_t off,
280 int count, int *eof, void *data)
281 {
282 int len;
283
284 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
285 utsname()->sysname,
286 utsname()->release,
287 utsname()->version);
288 return proc_calc_metrics(page, start, off, count, eof, len);
289 }
290
291 extern const struct seq_operations cpuinfo_op;
292 static int cpuinfo_open(struct inode *inode, struct file *file)
293 {
294 return seq_open(file, &cpuinfo_op);
295 }
296
297 static const struct file_operations proc_cpuinfo_operations = {
298 .open = cpuinfo_open,
299 .read = seq_read,
300 .llseek = seq_lseek,
301 .release = seq_release,
302 };
303
304 static int devinfo_show(struct seq_file *f, void *v)
305 {
306 int i = *(loff_t *) v;
307
308 if (i < CHRDEV_MAJOR_HASH_SIZE) {
309 if (i == 0)
310 seq_printf(f, "Character devices:\n");
311 chrdev_show(f, i);
312 }
313 #ifdef CONFIG_BLOCK
314 else {
315 i -= CHRDEV_MAJOR_HASH_SIZE;
316 if (i == 0)
317 seq_printf(f, "\nBlock devices:\n");
318 blkdev_show(f, i);
319 }
320 #endif
321 return 0;
322 }
323
324 static void *devinfo_start(struct seq_file *f, loff_t *pos)
325 {
326 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
327 return pos;
328 return NULL;
329 }
330
331 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
332 {
333 (*pos)++;
334 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
335 return NULL;
336 return pos;
337 }
338
339 static void devinfo_stop(struct seq_file *f, void *v)
340 {
341 /* Nothing to do */
342 }
343
344 static const struct seq_operations devinfo_ops = {
345 .start = devinfo_start,
346 .next = devinfo_next,
347 .stop = devinfo_stop,
348 .show = devinfo_show
349 };
350
351 static int devinfo_open(struct inode *inode, struct file *filp)
352 {
353 return seq_open(filp, &devinfo_ops);
354 }
355
356 static const struct file_operations proc_devinfo_operations = {
357 .open = devinfo_open,
358 .read = seq_read,
359 .llseek = seq_lseek,
360 .release = seq_release,
361 };
362
363 static int vmstat_open(struct inode *inode, struct file *file)
364 {
365 return seq_open(file, &vmstat_op);
366 }
367 static const struct file_operations proc_vmstat_file_operations = {
368 .open = vmstat_open,
369 .read = seq_read,
370 .llseek = seq_lseek,
371 .release = seq_release,
372 };
373
374 #ifdef CONFIG_PROC_HARDWARE
375 static int hardware_read_proc(char *page, char **start, off_t off,
376 int count, int *eof, void *data)
377 {
378 int len = get_hardware_list(page);
379 return proc_calc_metrics(page, start, off, count, eof, len);
380 }
381 #endif
382
383 #ifdef CONFIG_STRAM_PROC
384 static int stram_read_proc(char *page, char **start, off_t off,
385 int count, int *eof, void *data)
386 {
387 int len = get_stram_list(page);
388 return proc_calc_metrics(page, start, off, count, eof, len);
389 }
390 #endif
391
392 #ifdef CONFIG_BLOCK
393 static int partitions_open(struct inode *inode, struct file *file)
394 {
395 return seq_open(file, &partitions_op);
396 }
397 static const struct file_operations proc_partitions_operations = {
398 .open = partitions_open,
399 .read = seq_read,
400 .llseek = seq_lseek,
401 .release = seq_release,
402 };
403
404 static int diskstats_open(struct inode *inode, struct file *file)
405 {
406 return seq_open(file, &diskstats_op);
407 }
408 static const struct file_operations proc_diskstats_operations = {
409 .open = diskstats_open,
410 .read = seq_read,
411 .llseek = seq_lseek,
412 .release = seq_release,
413 };
414 #endif
415
416 #ifdef CONFIG_MODULES
417 extern const struct seq_operations modules_op;
418 static int modules_open(struct inode *inode, struct file *file)
419 {
420 return seq_open(file, &modules_op);
421 }
422 static const struct file_operations proc_modules_operations = {
423 .open = modules_open,
424 .read = seq_read,
425 .llseek = seq_lseek,
426 .release = seq_release,
427 };
428 #endif
429
430 #ifdef CONFIG_SLABINFO
431 static int slabinfo_open(struct inode *inode, struct file *file)
432 {
433 return seq_open(file, &slabinfo_op);
434 }
435 static const struct file_operations proc_slabinfo_operations = {
436 .open = slabinfo_open,
437 .read = seq_read,
438 .write = slabinfo_write,
439 .llseek = seq_lseek,
440 .release = seq_release,
441 };
442
443 #ifdef CONFIG_DEBUG_SLAB_LEAK
444 extern const struct seq_operations slabstats_op;
445 static int slabstats_open(struct inode *inode, struct file *file)
446 {
447 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
448 int ret = -ENOMEM;
449 if (n) {
450 ret = seq_open(file, &slabstats_op);
451 if (!ret) {
452 struct seq_file *m = file->private_data;
453 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
454 m->private = n;
455 n = NULL;
456 }
457 kfree(n);
458 }
459 return ret;
460 }
461
462 static const struct file_operations proc_slabstats_operations = {
463 .open = slabstats_open,
464 .read = seq_read,
465 .llseek = seq_lseek,
466 .release = seq_release_private,
467 };
468 #endif
469 #endif
470
471 #ifdef CONFIG_MMU
472 static int vmalloc_open(struct inode *inode, struct file *file)
473 {
474 unsigned int *ptr = NULL;
475 int ret;
476
477 if (NUMA_BUILD)
478 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
479 ret = seq_open(file, &vmalloc_op);
480 if (!ret) {
481 struct seq_file *m = file->private_data;
482 m->private = ptr;
483 } else
484 kfree(ptr);
485 return ret;
486 }
487
488 static const struct file_operations proc_vmalloc_operations = {
489 .open = vmalloc_open,
490 .read = seq_read,
491 .llseek = seq_lseek,
492 .release = seq_release_private,
493 };
494 #endif
495
496 #ifndef arch_irq_stat_cpu
497 #define arch_irq_stat_cpu(cpu) 0
498 #endif
499 #ifndef arch_irq_stat
500 #define arch_irq_stat() 0
501 #endif
502
503 static int show_stat(struct seq_file *p, void *v)
504 {
505 int i;
506 unsigned long jif;
507 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
508 cputime64_t guest;
509 u64 sum = 0;
510 struct timespec boottime;
511 unsigned int *per_irq_sum;
512
513 per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
514 if (!per_irq_sum)
515 return -ENOMEM;
516
517 user = nice = system = idle = iowait =
518 irq = softirq = steal = cputime64_zero;
519 guest = cputime64_zero;
520 getboottime(&boottime);
521 jif = boottime.tv_sec;
522
523 for_each_possible_cpu(i) {
524 int j;
525
526 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
527 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
528 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
529 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
530 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
531 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
532 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
533 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
534 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
535 for (j = 0; j < NR_IRQS; j++) {
536 unsigned int temp = kstat_cpu(i).irqs[j];
537 sum += temp;
538 per_irq_sum[j] += temp;
539 }
540 sum += arch_irq_stat_cpu(i);
541 }
542 sum += arch_irq_stat();
543
544 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
545 (unsigned long long)cputime64_to_clock_t(user),
546 (unsigned long long)cputime64_to_clock_t(nice),
547 (unsigned long long)cputime64_to_clock_t(system),
548 (unsigned long long)cputime64_to_clock_t(idle),
549 (unsigned long long)cputime64_to_clock_t(iowait),
550 (unsigned long long)cputime64_to_clock_t(irq),
551 (unsigned long long)cputime64_to_clock_t(softirq),
552 (unsigned long long)cputime64_to_clock_t(steal),
553 (unsigned long long)cputime64_to_clock_t(guest));
554 for_each_online_cpu(i) {
555
556 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
557 user = kstat_cpu(i).cpustat.user;
558 nice = kstat_cpu(i).cpustat.nice;
559 system = kstat_cpu(i).cpustat.system;
560 idle = kstat_cpu(i).cpustat.idle;
561 iowait = kstat_cpu(i).cpustat.iowait;
562 irq = kstat_cpu(i).cpustat.irq;
563 softirq = kstat_cpu(i).cpustat.softirq;
564 steal = kstat_cpu(i).cpustat.steal;
565 guest = kstat_cpu(i).cpustat.guest;
566 seq_printf(p,
567 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
568 i,
569 (unsigned long long)cputime64_to_clock_t(user),
570 (unsigned long long)cputime64_to_clock_t(nice),
571 (unsigned long long)cputime64_to_clock_t(system),
572 (unsigned long long)cputime64_to_clock_t(idle),
573 (unsigned long long)cputime64_to_clock_t(iowait),
574 (unsigned long long)cputime64_to_clock_t(irq),
575 (unsigned long long)cputime64_to_clock_t(softirq),
576 (unsigned long long)cputime64_to_clock_t(steal),
577 (unsigned long long)cputime64_to_clock_t(guest));
578 }
579 seq_printf(p, "intr %llu", (unsigned long long)sum);
580
581 for (i = 0; i < NR_IRQS; i++)
582 seq_printf(p, " %u", per_irq_sum[i]);
583
584 seq_printf(p,
585 "\nctxt %llu\n"
586 "btime %lu\n"
587 "processes %lu\n"
588 "procs_running %lu\n"
589 "procs_blocked %lu\n",
590 nr_context_switches(),
591 (unsigned long)jif,
592 total_forks,
593 nr_running(),
594 nr_iowait());
595
596 kfree(per_irq_sum);
597 return 0;
598 }
599
600 static int stat_open(struct inode *inode, struct file *file)
601 {
602 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
603 char *buf;
604 struct seq_file *m;
605 int res;
606
607 /* don't ask for more than the kmalloc() max size, currently 128 KB */
608 if (size > 128 * 1024)
609 size = 128 * 1024;
610 buf = kmalloc(size, GFP_KERNEL);
611 if (!buf)
612 return -ENOMEM;
613
614 res = single_open(file, show_stat, NULL);
615 if (!res) {
616 m = file->private_data;
617 m->buf = buf;
618 m->size = size;
619 } else
620 kfree(buf);
621 return res;
622 }
623 static const struct file_operations proc_stat_operations = {
624 .open = stat_open,
625 .read = seq_read,
626 .llseek = seq_lseek,
627 .release = single_release,
628 };
629
630 /*
631 * /proc/interrupts
632 */
633 static void *int_seq_start(struct seq_file *f, loff_t *pos)
634 {
635 return (*pos <= NR_IRQS) ? pos : NULL;
636 }
637
638 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
639 {
640 (*pos)++;
641 if (*pos > NR_IRQS)
642 return NULL;
643 return pos;
644 }
645
646 static void int_seq_stop(struct seq_file *f, void *v)
647 {
648 /* Nothing to do */
649 }
650
651
652 static const struct seq_operations int_seq_ops = {
653 .start = int_seq_start,
654 .next = int_seq_next,
655 .stop = int_seq_stop,
656 .show = show_interrupts
657 };
658
659 static int interrupts_open(struct inode *inode, struct file *filp)
660 {
661 return seq_open(filp, &int_seq_ops);
662 }
663
664 static const struct file_operations proc_interrupts_operations = {
665 .open = interrupts_open,
666 .read = seq_read,
667 .llseek = seq_lseek,
668 .release = seq_release,
669 };
670
671 static int filesystems_read_proc(char *page, char **start, off_t off,
672 int count, int *eof, void *data)
673 {
674 int len = get_filesystem_list(page);
675 return proc_calc_metrics(page, start, off, count, eof, len);
676 }
677
678 static int cmdline_read_proc(char *page, char **start, off_t off,
679 int count, int *eof, void *data)
680 {
681 int len;
682
683 len = sprintf(page, "%s\n", saved_command_line);
684 return proc_calc_metrics(page, start, off, count, eof, len);
685 }
686
687 static int locks_open(struct inode *inode, struct file *filp)
688 {
689 return seq_open(filp, &locks_seq_operations);
690 }
691
692 static const struct file_operations proc_locks_operations = {
693 .open = locks_open,
694 .read = seq_read,
695 .llseek = seq_lseek,
696 .release = seq_release,
697 };
698
699 static int execdomains_read_proc(char *page, char **start, off_t off,
700 int count, int *eof, void *data)
701 {
702 int len = get_exec_domain_list(page);
703 return proc_calc_metrics(page, start, off, count, eof, len);
704 }
705
706 #ifdef CONFIG_MAGIC_SYSRQ
707 /*
708 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
709 */
710 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
711 size_t count, loff_t *ppos)
712 {
713 if (count) {
714 char c;
715
716 if (get_user(c, buf))
717 return -EFAULT;
718 __handle_sysrq(c, NULL, 0);
719 }
720 return count;
721 }
722
723 static const struct file_operations proc_sysrq_trigger_operations = {
724 .write = write_sysrq_trigger,
725 };
726 #endif
727
728 #ifdef CONFIG_PROC_PAGE_MONITOR
729 #define KPMSIZE sizeof(u64)
730 #define KPMMASK (KPMSIZE - 1)
731 /* /proc/kpagecount - an array exposing page counts
732 *
733 * Each entry is a u64 representing the corresponding
734 * physical page count.
735 */
736 static ssize_t kpagecount_read(struct file *file, char __user *buf,
737 size_t count, loff_t *ppos)
738 {
739 u64 __user *out = (u64 __user *)buf;
740 struct page *ppage;
741 unsigned long src = *ppos;
742 unsigned long pfn;
743 ssize_t ret = 0;
744 u64 pcount;
745
746 pfn = src / KPMSIZE;
747 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
748 if (src & KPMMASK || count & KPMMASK)
749 return -EINVAL;
750
751 while (count > 0) {
752 ppage = NULL;
753 if (pfn_valid(pfn))
754 ppage = pfn_to_page(pfn);
755 pfn++;
756 if (!ppage)
757 pcount = 0;
758 else
759 pcount = page_mapcount(ppage);
760
761 if (put_user(pcount, out++)) {
762 ret = -EFAULT;
763 break;
764 }
765
766 count -= KPMSIZE;
767 }
768
769 *ppos += (char __user *)out - buf;
770 if (!ret)
771 ret = (char __user *)out - buf;
772 return ret;
773 }
774
775 static struct file_operations proc_kpagecount_operations = {
776 .llseek = mem_lseek,
777 .read = kpagecount_read,
778 };
779
780 /* /proc/kpageflags - an array exposing page flags
781 *
782 * Each entry is a u64 representing the corresponding
783 * physical page flags.
784 */
785
786 /* These macros are used to decouple internal flags from exported ones */
787
788 #define KPF_LOCKED 0
789 #define KPF_ERROR 1
790 #define KPF_REFERENCED 2
791 #define KPF_UPTODATE 3
792 #define KPF_DIRTY 4
793 #define KPF_LRU 5
794 #define KPF_ACTIVE 6
795 #define KPF_SLAB 7
796 #define KPF_WRITEBACK 8
797 #define KPF_RECLAIM 9
798 #define KPF_BUDDY 10
799
800 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
801
802 static ssize_t kpageflags_read(struct file *file, char __user *buf,
803 size_t count, loff_t *ppos)
804 {
805 u64 __user *out = (u64 __user *)buf;
806 struct page *ppage;
807 unsigned long src = *ppos;
808 unsigned long pfn;
809 ssize_t ret = 0;
810 u64 kflags, uflags;
811
812 pfn = src / KPMSIZE;
813 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
814 if (src & KPMMASK || count & KPMMASK)
815 return -EINVAL;
816
817 while (count > 0) {
818 ppage = NULL;
819 if (pfn_valid(pfn))
820 ppage = pfn_to_page(pfn);
821 pfn++;
822 if (!ppage)
823 kflags = 0;
824 else
825 kflags = ppage->flags;
826
827 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
828 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
829 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
830 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
831 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
832 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
833 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
834 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
835 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
836 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
837 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
838
839 if (put_user(uflags, out++)) {
840 ret = -EFAULT;
841 break;
842 }
843
844 count -= KPMSIZE;
845 }
846
847 *ppos += (char __user *)out - buf;
848 if (!ret)
849 ret = (char __user *)out - buf;
850 return ret;
851 }
852
853 static struct file_operations proc_kpageflags_operations = {
854 .llseek = mem_lseek,
855 .read = kpageflags_read,
856 };
857 #endif /* CONFIG_PROC_PAGE_MONITOR */
858
859 struct proc_dir_entry *proc_root_kcore;
860
861 void __init proc_misc_init(void)
862 {
863 static struct {
864 char *name;
865 int (*read_proc)(char*,char**,off_t,int,int*,void*);
866 } *p, simple_ones[] = {
867 {"loadavg", loadavg_read_proc},
868 {"uptime", uptime_read_proc},
869 {"meminfo", meminfo_read_proc},
870 {"version", version_read_proc},
871 #ifdef CONFIG_PROC_HARDWARE
872 {"hardware", hardware_read_proc},
873 #endif
874 #ifdef CONFIG_STRAM_PROC
875 {"stram", stram_read_proc},
876 #endif
877 {"filesystems", filesystems_read_proc},
878 {"cmdline", cmdline_read_proc},
879 {"execdomains", execdomains_read_proc},
880 {NULL,}
881 };
882 for (p = simple_ones; p->name; p++)
883 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
884
885 proc_symlink("mounts", NULL, "self/mounts");
886
887 /* And now for trickier ones */
888 #ifdef CONFIG_PRINTK
889 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
890 #endif
891 proc_create("locks", 0, NULL, &proc_locks_operations);
892 proc_create("devices", 0, NULL, &proc_devinfo_operations);
893 proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
894 #ifdef CONFIG_BLOCK
895 proc_create("partitions", 0, NULL, &proc_partitions_operations);
896 #endif
897 proc_create("stat", 0, NULL, &proc_stat_operations);
898 proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
899 #ifdef CONFIG_SLABINFO
900 proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
901 #ifdef CONFIG_DEBUG_SLAB_LEAK
902 proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
903 #endif
904 #endif
905 #ifdef CONFIG_MMU
906 proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
907 #endif
908 proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
909 proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
910 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
911 proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
912 #ifdef CONFIG_BLOCK
913 proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
914 #endif
915 #ifdef CONFIG_MODULES
916 proc_create("modules", 0, NULL, &proc_modules_operations);
917 #endif
918 #ifdef CONFIG_SCHEDSTATS
919 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
920 #endif
921 #ifdef CONFIG_PROC_KCORE
922 proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
923 if (proc_root_kcore)
924 proc_root_kcore->size =
925 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
926 #endif
927 #ifdef CONFIG_PROC_PAGE_MONITOR
928 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
929 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
930 #endif
931 #ifdef CONFIG_PROC_VMCORE
932 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
933 #endif
934 #ifdef CONFIG_MAGIC_SYSRQ
935 proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
936 #endif
937 }
Linux kernel - Deliverables
This page took 0.071251 seconds and 6 git commands to generate.