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Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-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 "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 }
Linux kernel - Deliverables
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