proc: move rest of /proc/partitions code to block/genhd.c
[linux-2.6.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/irq.h>
34 #include <linux/interrupt.h>
35 #include <linux/swap.h>
36 #include <linux/slab.h>
37 #include <linux/genhd.h>
38 #include <linux/smp.h>
39 #include <linux/signal.h>
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/seq_file.h>
43 #include <linux/times.h>
44 #include <linux/profile.h>
45 #include <linux/utsname.h>
46 #include <linux/blkdev.h>
47 #include <linux/hugetlb.h>
48 #include <linux/jiffies.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 static int fragmentation_open(struct inode *inode, struct file *file)
61 {
62         (void)inode;
63         return seq_open(file, &fragmentation_op);
64 }
65
66 static const struct file_operations fragmentation_file_operations = {
67         .open           = fragmentation_open,
68         .read           = seq_read,
69         .llseek         = seq_lseek,
70         .release        = seq_release,
71 };
72
73 static int pagetypeinfo_open(struct inode *inode, struct file *file)
74 {
75         return seq_open(file, &pagetypeinfo_op);
76 }
77
78 static const struct file_operations pagetypeinfo_file_ops = {
79         .open           = pagetypeinfo_open,
80         .read           = seq_read,
81         .llseek         = seq_lseek,
82         .release        = seq_release,
83 };
84
85 static int zoneinfo_open(struct inode *inode, struct file *file)
86 {
87         return seq_open(file, &zoneinfo_op);
88 }
89
90 static const struct file_operations proc_zoneinfo_file_operations = {
91         .open           = zoneinfo_open,
92         .read           = seq_read,
93         .llseek         = seq_lseek,
94         .release        = seq_release,
95 };
96
97 static int vmstat_open(struct inode *inode, struct file *file)
98 {
99         return seq_open(file, &vmstat_op);
100 }
101 static const struct file_operations proc_vmstat_file_operations = {
102         .open           = vmstat_open,
103         .read           = seq_read,
104         .llseek         = seq_lseek,
105         .release        = seq_release,
106 };
107
108 #ifdef CONFIG_BLOCK
109 static int diskstats_open(struct inode *inode, struct file *file)
110 {
111         return seq_open(file, &diskstats_op);
112 }
113 static const struct file_operations proc_diskstats_operations = {
114         .open           = diskstats_open,
115         .read           = seq_read,
116         .llseek         = seq_lseek,
117         .release        = seq_release,
118 };
119 #endif
120
121 #ifdef CONFIG_MODULES
122 extern const struct seq_operations modules_op;
123 static int modules_open(struct inode *inode, struct file *file)
124 {
125         return seq_open(file, &modules_op);
126 }
127 static const struct file_operations proc_modules_operations = {
128         .open           = modules_open,
129         .read           = seq_read,
130         .llseek         = seq_lseek,
131         .release        = seq_release,
132 };
133 #endif
134
135 #ifdef CONFIG_SLABINFO
136 static int slabinfo_open(struct inode *inode, struct file *file)
137 {
138         return seq_open(file, &slabinfo_op);
139 }
140 static const struct file_operations proc_slabinfo_operations = {
141         .open           = slabinfo_open,
142         .read           = seq_read,
143         .write          = slabinfo_write,
144         .llseek         = seq_lseek,
145         .release        = seq_release,
146 };
147
148 #ifdef CONFIG_DEBUG_SLAB_LEAK
149 extern const struct seq_operations slabstats_op;
150 static int slabstats_open(struct inode *inode, struct file *file)
151 {
152         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
153         int ret = -ENOMEM;
154         if (n) {
155                 ret = seq_open(file, &slabstats_op);
156                 if (!ret) {
157                         struct seq_file *m = file->private_data;
158                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
159                         m->private = n;
160                         n = NULL;
161                 }
162                 kfree(n);
163         }
164         return ret;
165 }
166
167 static const struct file_operations proc_slabstats_operations = {
168         .open           = slabstats_open,
169         .read           = seq_read,
170         .llseek         = seq_lseek,
171         .release        = seq_release_private,
172 };
173 #endif
174 #endif
175
176 #ifdef CONFIG_MMU
177 static int vmalloc_open(struct inode *inode, struct file *file)
178 {
179         unsigned int *ptr = NULL;
180         int ret;
181
182         if (NUMA_BUILD)
183                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
184         ret = seq_open(file, &vmalloc_op);
185         if (!ret) {
186                 struct seq_file *m = file->private_data;
187                 m->private = ptr;
188         } else
189                 kfree(ptr);
190         return ret;
191 }
192
193 static const struct file_operations proc_vmalloc_operations = {
194         .open           = vmalloc_open,
195         .read           = seq_read,
196         .llseek         = seq_lseek,
197         .release        = seq_release_private,
198 };
199 #endif
200
201 #ifndef arch_irq_stat_cpu
202 #define arch_irq_stat_cpu(cpu) 0
203 #endif
204 #ifndef arch_irq_stat
205 #define arch_irq_stat() 0
206 #endif
207
208 static int show_stat(struct seq_file *p, void *v)
209 {
210         int i, j;
211         unsigned long jif;
212         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
213         cputime64_t guest;
214         u64 sum = 0;
215         struct timespec boottime;
216         unsigned int per_irq_sum;
217
218         user = nice = system = idle = iowait =
219                 irq = softirq = steal = cputime64_zero;
220         guest = cputime64_zero;
221         getboottime(&boottime);
222         jif = boottime.tv_sec;
223
224         for_each_possible_cpu(i) {
225                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
226                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
227                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
228                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
229                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
230                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
231                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
232                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
233                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
234
235                 for_each_irq_nr(j)
236                         sum += kstat_irqs_cpu(j, i);
237
238                 sum += arch_irq_stat_cpu(i);
239         }
240         sum += arch_irq_stat();
241
242         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
243                 (unsigned long long)cputime64_to_clock_t(user),
244                 (unsigned long long)cputime64_to_clock_t(nice),
245                 (unsigned long long)cputime64_to_clock_t(system),
246                 (unsigned long long)cputime64_to_clock_t(idle),
247                 (unsigned long long)cputime64_to_clock_t(iowait),
248                 (unsigned long long)cputime64_to_clock_t(irq),
249                 (unsigned long long)cputime64_to_clock_t(softirq),
250                 (unsigned long long)cputime64_to_clock_t(steal),
251                 (unsigned long long)cputime64_to_clock_t(guest));
252         for_each_online_cpu(i) {
253
254                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
255                 user = kstat_cpu(i).cpustat.user;
256                 nice = kstat_cpu(i).cpustat.nice;
257                 system = kstat_cpu(i).cpustat.system;
258                 idle = kstat_cpu(i).cpustat.idle;
259                 iowait = kstat_cpu(i).cpustat.iowait;
260                 irq = kstat_cpu(i).cpustat.irq;
261                 softirq = kstat_cpu(i).cpustat.softirq;
262                 steal = kstat_cpu(i).cpustat.steal;
263                 guest = kstat_cpu(i).cpustat.guest;
264                 seq_printf(p,
265                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
266                         i,
267                         (unsigned long long)cputime64_to_clock_t(user),
268                         (unsigned long long)cputime64_to_clock_t(nice),
269                         (unsigned long long)cputime64_to_clock_t(system),
270                         (unsigned long long)cputime64_to_clock_t(idle),
271                         (unsigned long long)cputime64_to_clock_t(iowait),
272                         (unsigned long long)cputime64_to_clock_t(irq),
273                         (unsigned long long)cputime64_to_clock_t(softirq),
274                         (unsigned long long)cputime64_to_clock_t(steal),
275                         (unsigned long long)cputime64_to_clock_t(guest));
276         }
277         seq_printf(p, "intr %llu", (unsigned long long)sum);
278
279         /* sum again ? it could be updated? */
280         for_each_irq_nr(j) {
281                 per_irq_sum = 0;
282
283                 for_each_possible_cpu(i)
284                         per_irq_sum += kstat_irqs_cpu(j, i);
285
286                 seq_printf(p, " %u", per_irq_sum);
287         }
288
289         seq_printf(p,
290                 "\nctxt %llu\n"
291                 "btime %lu\n"
292                 "processes %lu\n"
293                 "procs_running %lu\n"
294                 "procs_blocked %lu\n",
295                 nr_context_switches(),
296                 (unsigned long)jif,
297                 total_forks,
298                 nr_running(),
299                 nr_iowait());
300
301         return 0;
302 }
303
304 static int stat_open(struct inode *inode, struct file *file)
305 {
306         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
307         char *buf;
308         struct seq_file *m;
309         int res;
310
311         /* don't ask for more than the kmalloc() max size, currently 128 KB */
312         if (size > 128 * 1024)
313                 size = 128 * 1024;
314         buf = kmalloc(size, GFP_KERNEL);
315         if (!buf)
316                 return -ENOMEM;
317
318         res = single_open(file, show_stat, NULL);
319         if (!res) {
320                 m = file->private_data;
321                 m->buf = buf;
322                 m->size = size;
323         } else
324                 kfree(buf);
325         return res;
326 }
327 static const struct file_operations proc_stat_operations = {
328         .open           = stat_open,
329         .read           = seq_read,
330         .llseek         = seq_lseek,
331         .release        = single_release,
332 };
333
334 /*
335  * /proc/interrupts
336  */
337 static void *int_seq_start(struct seq_file *f, loff_t *pos)
338 {
339         return (*pos <= nr_irqs) ? pos : NULL;
340 }
341
342
343 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
344 {
345         (*pos)++;
346         return (*pos <= nr_irqs) ? pos : NULL;
347 }
348
349 static void int_seq_stop(struct seq_file *f, void *v)
350 {
351         /* Nothing to do */
352 }
353
354 static const struct seq_operations int_seq_ops = {
355         .start = int_seq_start,
356         .next  = int_seq_next,
357         .stop  = int_seq_stop,
358         .show  = show_interrupts
359 };
360
361 static int interrupts_open(struct inode *inode, struct file *filp)
362 {
363         return seq_open(filp, &int_seq_ops);
364 }
365
366 static const struct file_operations proc_interrupts_operations = {
367         .open           = interrupts_open,
368         .read           = seq_read,
369         .llseek         = seq_lseek,
370         .release        = seq_release,
371 };
372
373 #ifdef CONFIG_PROC_PAGE_MONITOR
374 #define KPMSIZE sizeof(u64)
375 #define KPMMASK (KPMSIZE - 1)
376 /* /proc/kpagecount - an array exposing page counts
377  *
378  * Each entry is a u64 representing the corresponding
379  * physical page count.
380  */
381 static ssize_t kpagecount_read(struct file *file, char __user *buf,
382                              size_t count, loff_t *ppos)
383 {
384         u64 __user *out = (u64 __user *)buf;
385         struct page *ppage;
386         unsigned long src = *ppos;
387         unsigned long pfn;
388         ssize_t ret = 0;
389         u64 pcount;
390
391         pfn = src / KPMSIZE;
392         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
393         if (src & KPMMASK || count & KPMMASK)
394                 return -EINVAL;
395
396         while (count > 0) {
397                 ppage = NULL;
398                 if (pfn_valid(pfn))
399                         ppage = pfn_to_page(pfn);
400                 pfn++;
401                 if (!ppage)
402                         pcount = 0;
403                 else
404                         pcount = page_mapcount(ppage);
405
406                 if (put_user(pcount, out++)) {
407                         ret = -EFAULT;
408                         break;
409                 }
410
411                 count -= KPMSIZE;
412         }
413
414         *ppos += (char __user *)out - buf;
415         if (!ret)
416                 ret = (char __user *)out - buf;
417         return ret;
418 }
419
420 static struct file_operations proc_kpagecount_operations = {
421         .llseek = mem_lseek,
422         .read = kpagecount_read,
423 };
424
425 /* /proc/kpageflags - an array exposing page flags
426  *
427  * Each entry is a u64 representing the corresponding
428  * physical page flags.
429  */
430
431 /* These macros are used to decouple internal flags from exported ones */
432
433 #define KPF_LOCKED     0
434 #define KPF_ERROR      1
435 #define KPF_REFERENCED 2
436 #define KPF_UPTODATE   3
437 #define KPF_DIRTY      4
438 #define KPF_LRU        5
439 #define KPF_ACTIVE     6
440 #define KPF_SLAB       7
441 #define KPF_WRITEBACK  8
442 #define KPF_RECLAIM    9
443 #define KPF_BUDDY     10
444
445 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
446
447 static ssize_t kpageflags_read(struct file *file, char __user *buf,
448                              size_t count, loff_t *ppos)
449 {
450         u64 __user *out = (u64 __user *)buf;
451         struct page *ppage;
452         unsigned long src = *ppos;
453         unsigned long pfn;
454         ssize_t ret = 0;
455         u64 kflags, uflags;
456
457         pfn = src / KPMSIZE;
458         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
459         if (src & KPMMASK || count & KPMMASK)
460                 return -EINVAL;
461
462         while (count > 0) {
463                 ppage = NULL;
464                 if (pfn_valid(pfn))
465                         ppage = pfn_to_page(pfn);
466                 pfn++;
467                 if (!ppage)
468                         kflags = 0;
469                 else
470                         kflags = ppage->flags;
471
472                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
473                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
474                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
475                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
476                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
477                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
478                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
479                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
480                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
481                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
482                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
483
484                 if (put_user(uflags, out++)) {
485                         ret = -EFAULT;
486                         break;
487                 }
488
489                 count -= KPMSIZE;
490         }
491
492         *ppos += (char __user *)out - buf;
493         if (!ret)
494                 ret = (char __user *)out - buf;
495         return ret;
496 }
497
498 static struct file_operations proc_kpageflags_operations = {
499         .llseek = mem_lseek,
500         .read = kpageflags_read,
501 };
502 #endif /* CONFIG_PROC_PAGE_MONITOR */
503
504 struct proc_dir_entry *proc_root_kcore;
505
506 void __init proc_misc_init(void)
507 {
508         proc_symlink("mounts", NULL, "self/mounts");
509
510         /* And now for trickier ones */
511         proc_create("stat", 0, NULL, &proc_stat_operations);
512         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
513 #ifdef CONFIG_SLABINFO
514         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
515 #ifdef CONFIG_DEBUG_SLAB_LEAK
516         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
517 #endif
518 #endif
519 #ifdef CONFIG_MMU
520         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
521 #endif
522         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
523         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
524         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
525         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
526 #ifdef CONFIG_BLOCK
527         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
528 #endif
529 #ifdef CONFIG_MODULES
530         proc_create("modules", 0, NULL, &proc_modules_operations);
531 #endif
532 #ifdef CONFIG_SCHEDSTATS
533         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
534 #endif
535 #ifdef CONFIG_PROC_KCORE
536         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
537         if (proc_root_kcore)
538                 proc_root_kcore->size =
539                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
540 #endif
541 #ifdef CONFIG_PROC_PAGE_MONITOR
542         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
543         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
544 #endif
545 #ifdef CONFIG_PROC_VMCORE
546         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
547 #endif
548 }