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reiserfs: add missing unlock to an error path in reiserfs_quota_write()
[linux-2.6/mini2440.git] / fs / proc / proc_misc.c
blob7e277f2ad466da31d9233a06f17963c718c37397
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_long_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 "WritebackTmp: %8lu kB\n"
183 "CommitLimit: %8lu kB\n"
184 "Committed_AS: %8lu kB\n"
185 "VmallocTotal: %8lu kB\n"
186 "VmallocUsed: %8lu kB\n"
187 "VmallocChunk: %8lu kB\n",
188 K(i.totalram),
189 K(i.freeram),
190 K(i.bufferram),
191 K(cached),
192 K(total_swapcache_pages),
193 K(global_page_state(NR_ACTIVE)),
194 K(global_page_state(NR_INACTIVE)),
195 #ifdef CONFIG_HIGHMEM
196 K(i.totalhigh),
197 K(i.freehigh),
198 K(i.totalram-i.totalhigh),
199 K(i.freeram-i.freehigh),
200 #endif
201 K(i.totalswap),
202 K(i.freeswap),
203 K(global_page_state(NR_FILE_DIRTY)),
204 K(global_page_state(NR_WRITEBACK)),
205 K(global_page_state(NR_ANON_PAGES)),
206 K(global_page_state(NR_FILE_MAPPED)),
207 K(global_page_state(NR_SLAB_RECLAIMABLE) +
208 global_page_state(NR_SLAB_UNRECLAIMABLE)),
209 K(global_page_state(NR_SLAB_RECLAIMABLE)),
210 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
211 K(global_page_state(NR_PAGETABLE)),
212 K(global_page_state(NR_UNSTABLE_NFS)),
213 K(global_page_state(NR_BOUNCE)),
214 K(global_page_state(NR_WRITEBACK_TEMP)),
215 K(allowed),
216 K(committed),
217 (unsigned long)VMALLOC_TOTAL >> 10,
218 vmi.used >> 10,
219 vmi.largest_chunk >> 10
220 );
221
222 len += hugetlb_report_meminfo(page + len);
223
224 return proc_calc_metrics(page, start, off, count, eof, len);
225 #undef K
226 }
227
228 extern const struct seq_operations fragmentation_op;
229 static int fragmentation_open(struct inode *inode, struct file *file)
230 {
231 (void)inode;
232 return seq_open(file, &fragmentation_op);
233 }
234
235 static const struct file_operations fragmentation_file_operations = {
236 .open = fragmentation_open,
237 .read = seq_read,
238 .llseek = seq_lseek,
239 .release = seq_release,
240 };
241
242 extern const struct seq_operations pagetypeinfo_op;
243 static int pagetypeinfo_open(struct inode *inode, struct file *file)
244 {
245 return seq_open(file, &pagetypeinfo_op);
246 }
247
248 static const struct file_operations pagetypeinfo_file_ops = {
249 .open = pagetypeinfo_open,
250 .read = seq_read,
251 .llseek = seq_lseek,
252 .release = seq_release,
253 };
254
255 extern const struct seq_operations zoneinfo_op;
256 static int zoneinfo_open(struct inode *inode, struct file *file)
257 {
258 return seq_open(file, &zoneinfo_op);
259 }
260
261 static const struct file_operations proc_zoneinfo_file_operations = {
262 .open = zoneinfo_open,
263 .read = seq_read,
264 .llseek = seq_lseek,
265 .release = seq_release,
266 };
267
268 static int version_read_proc(char *page, char **start, off_t off,
269 int count, int *eof, void *data)
270 {
271 int len;
272
273 len = snprintf(page, PAGE_SIZE, linux_proc_banner,
274 utsname()->sysname,
275 utsname()->release,
276 utsname()->version);
277 return proc_calc_metrics(page, start, off, count, eof, len);
278 }
279
280 extern const struct seq_operations cpuinfo_op;
281 static int cpuinfo_open(struct inode *inode, struct file *file)
282 {
283 return seq_open(file, &cpuinfo_op);
284 }
285
286 static const struct file_operations proc_cpuinfo_operations = {
287 .open = cpuinfo_open,
288 .read = seq_read,
289 .llseek = seq_lseek,
290 .release = seq_release,
291 };
292
293 static int devinfo_show(struct seq_file *f, void *v)
294 {
295 int i = *(loff_t *) v;
296
297 if (i < CHRDEV_MAJOR_HASH_SIZE) {
298 if (i == 0)
299 seq_printf(f, "Character devices:\n");
300 chrdev_show(f, i);
301 }
302 #ifdef CONFIG_BLOCK
303 else {
304 i -= CHRDEV_MAJOR_HASH_SIZE;
305 if (i == 0)
306 seq_printf(f, "\nBlock devices:\n");
307 blkdev_show(f, i);
308 }
309 #endif
310 return 0;
311 }
312
313 static void *devinfo_start(struct seq_file *f, loff_t *pos)
314 {
315 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
316 return pos;
317 return NULL;
318 }
319
320 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
321 {
322 (*pos)++;
323 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
324 return NULL;
325 return pos;
326 }
327
328 static void devinfo_stop(struct seq_file *f, void *v)
329 {
330 /* Nothing to do */
331 }
332
333 static const struct seq_operations devinfo_ops = {
334 .start = devinfo_start,
335 .next = devinfo_next,
336 .stop = devinfo_stop,
337 .show = devinfo_show
338 };
339
340 static int devinfo_open(struct inode *inode, struct file *filp)
341 {
342 return seq_open(filp, &devinfo_ops);
343 }
344
345 static const struct file_operations proc_devinfo_operations = {
346 .open = devinfo_open,
347 .read = seq_read,
348 .llseek = seq_lseek,
349 .release = seq_release,
350 };
351
352 extern const struct seq_operations vmstat_op;
353 static int vmstat_open(struct inode *inode, struct file *file)
354 {
355 return seq_open(file, &vmstat_op);
356 }
357 static const struct file_operations proc_vmstat_file_operations = {
358 .open = vmstat_open,
359 .read = seq_read,
360 .llseek = seq_lseek,
361 .release = seq_release,
362 };
363
364 #ifdef CONFIG_PROC_HARDWARE
365 static int hardware_read_proc(char *page, char **start, off_t off,
366 int count, int *eof, void *data)
367 {
368 int len = get_hardware_list(page);
369 return proc_calc_metrics(page, start, off, count, eof, len);
370 }
371 #endif
372
373 #ifdef CONFIG_STRAM_PROC
374 static int stram_read_proc(char *page, char **start, off_t off,
375 int count, int *eof, void *data)
376 {
377 int len = get_stram_list(page);
378 return proc_calc_metrics(page, start, off, count, eof, len);
379 }
380 #endif
381
382 #ifdef CONFIG_BLOCK
383 static int partitions_open(struct inode *inode, struct file *file)
384 {
385 return seq_open(file, &partitions_op);
386 }
387 static const struct file_operations proc_partitions_operations = {
388 .open = partitions_open,
389 .read = seq_read,
390 .llseek = seq_lseek,
391 .release = seq_release,
392 };
393
394 static int diskstats_open(struct inode *inode, struct file *file)
395 {
396 return seq_open(file, &diskstats_op);
397 }
398 static const struct file_operations proc_diskstats_operations = {
399 .open = diskstats_open,
400 .read = seq_read,
401 .llseek = seq_lseek,
402 .release = seq_release,
403 };
404 #endif
405
406 #ifdef CONFIG_MODULES
407 extern const struct seq_operations modules_op;
408 static int modules_open(struct inode *inode, struct file *file)
409 {
410 return seq_open(file, &modules_op);
411 }
412 static const struct file_operations proc_modules_operations = {
413 .open = modules_open,
414 .read = seq_read,
415 .llseek = seq_lseek,
416 .release = seq_release,
417 };
418 #endif
419
420 #ifdef CONFIG_SLABINFO
421 static int slabinfo_open(struct inode *inode, struct file *file)
422 {
423 return seq_open(file, &slabinfo_op);
424 }
425 static const struct file_operations proc_slabinfo_operations = {
426 .open = slabinfo_open,
427 .read = seq_read,
428 .write = slabinfo_write,
429 .llseek = seq_lseek,
430 .release = seq_release,
431 };
432
433 #ifdef CONFIG_DEBUG_SLAB_LEAK
434 extern const struct seq_operations slabstats_op;
435 static int slabstats_open(struct inode *inode, struct file *file)
436 {
437 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
438 int ret = -ENOMEM;
439 if (n) {
440 ret = seq_open(file, &slabstats_op);
441 if (!ret) {
442 struct seq_file *m = file->private_data;
443 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
444 m->private = n;
445 n = NULL;
446 }
447 kfree(n);
448 }
449 return ret;
450 }
451
452 static const struct file_operations proc_slabstats_operations = {
453 .open = slabstats_open,
454 .read = seq_read,
455 .llseek = seq_lseek,
456 .release = seq_release_private,
457 };
458 #endif
459 #endif
460
461 #ifdef CONFIG_MMU
462 static int vmalloc_open(struct inode *inode, struct file *file)
463 {
464 return seq_open(file, &vmalloc_op);
465 }
466
467 static const struct file_operations proc_vmalloc_operations = {
468 .open = vmalloc_open,
469 .read = seq_read,
470 .llseek = seq_lseek,
471 .release = seq_release,
472 };
473 #endif
474
475 static int show_stat(struct seq_file *p, void *v)
476 {
477 int i;
478 unsigned long jif;
479 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
480 cputime64_t guest;
481 u64 sum = 0;
482 struct timespec boottime;
483 unsigned int *per_irq_sum;
484
485 per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
486 if (!per_irq_sum)
487 return -ENOMEM;
488
489 user = nice = system = idle = iowait =
490 irq = softirq = steal = cputime64_zero;
491 guest = cputime64_zero;
492 getboottime(&boottime);
493 jif = boottime.tv_sec;
494
495 for_each_possible_cpu(i) {
496 int j;
497
498 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
499 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
500 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
501 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
502 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
503 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
504 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
505 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
506 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
507 for (j = 0; j < NR_IRQS; j++) {
508 unsigned int temp = kstat_cpu(i).irqs[j];
509 sum += temp;
510 per_irq_sum[j] += temp;
511 }
512 }
513
514 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
515 (unsigned long long)cputime64_to_clock_t(user),
516 (unsigned long long)cputime64_to_clock_t(nice),
517 (unsigned long long)cputime64_to_clock_t(system),
518 (unsigned long long)cputime64_to_clock_t(idle),
519 (unsigned long long)cputime64_to_clock_t(iowait),
520 (unsigned long long)cputime64_to_clock_t(irq),
521 (unsigned long long)cputime64_to_clock_t(softirq),
522 (unsigned long long)cputime64_to_clock_t(steal),
523 (unsigned long long)cputime64_to_clock_t(guest));
524 for_each_online_cpu(i) {
525
526 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
527 user = kstat_cpu(i).cpustat.user;
528 nice = kstat_cpu(i).cpustat.nice;
529 system = kstat_cpu(i).cpustat.system;
530 idle = kstat_cpu(i).cpustat.idle;
531 iowait = kstat_cpu(i).cpustat.iowait;
532 irq = kstat_cpu(i).cpustat.irq;
533 softirq = kstat_cpu(i).cpustat.softirq;
534 steal = kstat_cpu(i).cpustat.steal;
535 guest = kstat_cpu(i).cpustat.guest;
536 seq_printf(p,
537 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
538 i,
539 (unsigned long long)cputime64_to_clock_t(user),
540 (unsigned long long)cputime64_to_clock_t(nice),
541 (unsigned long long)cputime64_to_clock_t(system),
542 (unsigned long long)cputime64_to_clock_t(idle),
543 (unsigned long long)cputime64_to_clock_t(iowait),
544 (unsigned long long)cputime64_to_clock_t(irq),
545 (unsigned long long)cputime64_to_clock_t(softirq),
546 (unsigned long long)cputime64_to_clock_t(steal),
547 (unsigned long long)cputime64_to_clock_t(guest));
548 }
549 seq_printf(p, "intr %llu", (unsigned long long)sum);
550
551 for (i = 0; i < NR_IRQS; i++)
552 seq_printf(p, " %u", per_irq_sum[i]);
553
554 seq_printf(p,
555 "\nctxt %llu\n"
556 "btime %lu\n"
557 "processes %lu\n"
558 "procs_running %lu\n"
559 "procs_blocked %lu\n",
560 nr_context_switches(),
561 (unsigned long)jif,
562 total_forks,
563 nr_running(),
564 nr_iowait());
565
566 kfree(per_irq_sum);
567 return 0;
568 }
569
570 static int stat_open(struct inode *inode, struct file *file)
571 {
572 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
573 char *buf;
574 struct seq_file *m;
575 int res;
576
577 /* don't ask for more than the kmalloc() max size, currently 128 KB */
578 if (size > 128 * 1024)
579 size = 128 * 1024;
580 buf = kmalloc(size, GFP_KERNEL);
581 if (!buf)
582 return -ENOMEM;
583
584 res = single_open(file, show_stat, NULL);
585 if (!res) {
586 m = file->private_data;
587 m->buf = buf;
588 m->size = size;
589 } else
590 kfree(buf);
591 return res;
592 }
593 static const struct file_operations proc_stat_operations = {
594 .open = stat_open,
595 .read = seq_read,
596 .llseek = seq_lseek,
597 .release = single_release,
598 };
599
600 /*
601 * /proc/interrupts
602 */
603 static void *int_seq_start(struct seq_file *f, loff_t *pos)
604 {
605 return (*pos <= NR_IRQS) ? pos : NULL;
606 }
607
608 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
609 {
610 (*pos)++;
611 if (*pos > NR_IRQS)
612 return NULL;
613 return pos;
614 }
615
616 static void int_seq_stop(struct seq_file *f, void *v)
617 {
618 /* Nothing to do */
619 }
620
621
622 static const struct seq_operations int_seq_ops = {
623 .start = int_seq_start,
624 .next = int_seq_next,
625 .stop = int_seq_stop,
626 .show = show_interrupts
627 };
628
629 static int interrupts_open(struct inode *inode, struct file *filp)
630 {
631 return seq_open(filp, &int_seq_ops);
632 }
633
634 static const struct file_operations proc_interrupts_operations = {
635 .open = interrupts_open,
636 .read = seq_read,
637 .llseek = seq_lseek,
638 .release = seq_release,
639 };
640
641 static int filesystems_read_proc(char *page, char **start, off_t off,
642 int count, int *eof, void *data)
643 {
644 int len = get_filesystem_list(page);
645 return proc_calc_metrics(page, start, off, count, eof, len);
646 }
647
648 static int cmdline_read_proc(char *page, char **start, off_t off,
649 int count, int *eof, void *data)
650 {
651 int len;
652
653 len = sprintf(page, "%s\n", saved_command_line);
654 return proc_calc_metrics(page, start, off, count, eof, len);
655 }
656
657 static int locks_open(struct inode *inode, struct file *filp)
658 {
659 return seq_open(filp, &locks_seq_operations);
660 }
661
662 static const struct file_operations proc_locks_operations = {
663 .open = locks_open,
664 .read = seq_read,
665 .llseek = seq_lseek,
666 .release = seq_release,
667 };
668
669 static int execdomains_read_proc(char *page, char **start, off_t off,
670 int count, int *eof, void *data)
671 {
672 int len = get_exec_domain_list(page);
673 return proc_calc_metrics(page, start, off, count, eof, len);
674 }
675
676 #ifdef CONFIG_MAGIC_SYSRQ
677 /*
678 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
679 */
680 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
681 size_t count, loff_t *ppos)
682 {
683 if (count) {
684 char c;
685
686 if (get_user(c, buf))
687 return -EFAULT;
688 __handle_sysrq(c, NULL, 0);
689 }
690 return count;
691 }
692
693 static const struct file_operations proc_sysrq_trigger_operations = {
694 .write = write_sysrq_trigger,
695 };
696 #endif
697
698 #ifdef CONFIG_PROC_PAGE_MONITOR
699 #define KPMSIZE sizeof(u64)
700 #define KPMMASK (KPMSIZE - 1)
701 /* /proc/kpagecount - an array exposing page counts
702 *
703 * Each entry is a u64 representing the corresponding
704 * physical page count.
705 */
706 static ssize_t kpagecount_read(struct file *file, char __user *buf,
707 size_t count, loff_t *ppos)
708 {
709 u64 __user *out = (u64 __user *)buf;
710 struct page *ppage;
711 unsigned long src = *ppos;
712 unsigned long pfn;
713 ssize_t ret = 0;
714 u64 pcount;
715
716 pfn = src / KPMSIZE;
717 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
718 if (src & KPMMASK || count & KPMMASK)
719 return -EINVAL;
720
721 while (count > 0) {
722 ppage = NULL;
723 if (pfn_valid(pfn))
724 ppage = pfn_to_page(pfn);
725 pfn++;
726 if (!ppage)
727 pcount = 0;
728 else
729 pcount = page_mapcount(ppage);
730
731 if (put_user(pcount, out++)) {
732 ret = -EFAULT;
733 break;
734 }
735
736 count -= KPMSIZE;
737 }
738
739 *ppos += (char __user *)out - buf;
740 if (!ret)
741 ret = (char __user *)out - buf;
742 return ret;
743 }
744
745 static struct file_operations proc_kpagecount_operations = {
746 .llseek = mem_lseek,
747 .read = kpagecount_read,
748 };
749
750 /* /proc/kpageflags - an array exposing page flags
751 *
752 * Each entry is a u64 representing the corresponding
753 * physical page flags.
754 */
755
756 /* These macros are used to decouple internal flags from exported ones */
757
758 #define KPF_LOCKED 0
759 #define KPF_ERROR 1
760 #define KPF_REFERENCED 2
761 #define KPF_UPTODATE 3
762 #define KPF_DIRTY 4
763 #define KPF_LRU 5
764 #define KPF_ACTIVE 6
765 #define KPF_SLAB 7
766 #define KPF_WRITEBACK 8
767 #define KPF_RECLAIM 9
768 #define KPF_BUDDY 10
769
770 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
771
772 static ssize_t kpageflags_read(struct file *file, char __user *buf,
773 size_t count, loff_t *ppos)
774 {
775 u64 __user *out = (u64 __user *)buf;
776 struct page *ppage;
777 unsigned long src = *ppos;
778 unsigned long pfn;
779 ssize_t ret = 0;
780 u64 kflags, uflags;
781
782 pfn = src / KPMSIZE;
783 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
784 if (src & KPMMASK || count & KPMMASK)
785 return -EINVAL;
786
787 while (count > 0) {
788 ppage = NULL;
789 if (pfn_valid(pfn))
790 ppage = pfn_to_page(pfn);
791 pfn++;
792 if (!ppage)
793 kflags = 0;
794 else
795 kflags = ppage->flags;
796
797 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
798 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
799 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
800 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
801 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
802 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
803 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
804 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
805 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
806 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
807 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
808
809 if (put_user(uflags, out++)) {
810 ret = -EFAULT;
811 break;
812 }
813
814 count -= KPMSIZE;
815 }
816
817 *ppos += (char __user *)out - buf;
818 if (!ret)
819 ret = (char __user *)out - buf;
820 return ret;
821 }
822
823 static struct file_operations proc_kpageflags_operations = {
824 .llseek = mem_lseek,
825 .read = kpageflags_read,
826 };
827 #endif /* CONFIG_PROC_PAGE_MONITOR */
828
829 struct proc_dir_entry *proc_root_kcore;
830
831 void __init proc_misc_init(void)
832 {
833 static struct {
834 char *name;
835 int (*read_proc)(char*,char**,off_t,int,int*,void*);
836 } *p, simple_ones[] = {
837 {"loadavg", loadavg_read_proc},
838 {"uptime", uptime_read_proc},
839 {"meminfo", meminfo_read_proc},
840 {"version", version_read_proc},
841 #ifdef CONFIG_PROC_HARDWARE
842 {"hardware", hardware_read_proc},
843 #endif
844 #ifdef CONFIG_STRAM_PROC
845 {"stram", stram_read_proc},
846 #endif
847 {"filesystems", filesystems_read_proc},
848 {"cmdline", cmdline_read_proc},
849 {"execdomains", execdomains_read_proc},
850 {NULL,}
851 };
852 for (p = simple_ones; p->name; p++)
853 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
854
855 proc_symlink("mounts", NULL, "self/mounts");
856
857 /* And now for trickier ones */
858 #ifdef CONFIG_PRINTK
859 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
860 #endif
861 proc_create("locks", 0, NULL, &proc_locks_operations);
862 proc_create("devices", 0, NULL, &proc_devinfo_operations);
863 proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
864 #ifdef CONFIG_BLOCK
865 proc_create("partitions", 0, NULL, &proc_partitions_operations);
866 #endif
867 proc_create("stat", 0, NULL, &proc_stat_operations);
868 proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
869 #ifdef CONFIG_SLABINFO
870 proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
871 #ifdef CONFIG_DEBUG_SLAB_LEAK
872 proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
873 #endif
874 #endif
875 #ifdef CONFIG_MMU
876 proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
877 #endif
878 proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
879 proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
880 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
881 proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
882 #ifdef CONFIG_BLOCK
883 proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
884 #endif
885 #ifdef CONFIG_MODULES
886 proc_create("modules", 0, NULL, &proc_modules_operations);
887 #endif
888 #ifdef CONFIG_SCHEDSTATS
889 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
890 #endif
891 #ifdef CONFIG_PROC_KCORE
892 proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
893 if (proc_root_kcore)
894 proc_root_kcore->size =
895 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
896 #endif
897 #ifdef CONFIG_PROC_PAGE_MONITOR
898 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
899 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
900 #endif
901 #ifdef CONFIG_PROC_VMCORE
902 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
903 #endif
904 #ifdef CONFIG_MAGIC_SYSRQ
905 proc_create("sysrq-trigger", S_IWUSR, NULL, &proc_sysrq_trigger_operations);
906 #endif
907 }
Support for the Chinese Samsung S3C2440 based development boards