summaryrefslogtreecommitdiffstats
path: root/fs/proc/proc_misc.c
blob: 900331a634ef570c0c159e5043dae9a99e8be970 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
/*
 *  linux/fs/proc/proc_misc.c
 *
 *  linux/fs/proc/array.c
 *  Copyright (C) 1992  by Linus Torvalds
 *  based on ideas by Darren Senn
 *
 *  This used to be the part of array.c. See the rest of history and credits
 *  there. I took this into a separate file and switched the thing to generic
 *  proc_file_inode_operations, leaving in array.c only per-process stuff.
 *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
 *
 * Changes:
 * Fulton Green      :  Encapsulated position metric calculations.
 *			<kernel@FultonGreen.com>
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/fs.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/mman.h>
#include <linux/quicklist.h>
#include <linux/proc_fs.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/pagemap.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/genhd.h>
#include <linux/smp.h>
#include <linux/signal.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/times.h>
#include <linux/profile.h>
#include <linux/utsname.h>
#include <linux/blkdev.h>
#include <linux/hugetlb.h>
#include <linux/jiffies.h>
#include <linux/vmalloc.h>
#include <linux/crash_dump.h>
#include <linux/pid_namespace.h>
#include <linux/bootmem.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/div64.h>
#include "internal.h"

static int zoneinfo_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &zoneinfo_op);
}

static const struct file_operations proc_zoneinfo_file_operations = {
	.open		= zoneinfo_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int vmstat_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &vmstat_op);
}
static const struct file_operations proc_vmstat_file_operations = {
	.open		= vmstat_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

#ifdef CONFIG_BLOCK
static int diskstats_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &diskstats_op);
}
static const struct file_operations proc_diskstats_operations = {
	.open		= diskstats_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};
#endif

#ifdef CONFIG_MODULES
extern const struct seq_operations modules_op;
static int modules_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &modules_op);
}
static const struct file_operations proc_modules_operations = {
	.open		= modules_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};
#endif

#ifdef CONFIG_PROC_PAGE_MONITOR
#define KPMSIZE sizeof(u64)
#define KPMMASK (KPMSIZE - 1)
/* /proc/kpagecount - an array exposing page counts
 *
 * Each entry is a u64 representing the corresponding
 * physical page count.
 */
static ssize_t kpagecount_read(struct file *file, char __user *buf,
			     size_t count, loff_t *ppos)
{
	u64 __user *out = (u64 __user *)buf;
	struct page *ppage;
	unsigned long src = *ppos;
	unsigned long pfn;
	ssize_t ret = 0;
	u64 pcount;

	pfn = src / KPMSIZE;
	count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
	if (src & KPMMASK || count & KPMMASK)
		return -EINVAL;

	while (count > 0) {
		ppage = NULL;
		if (pfn_valid(pfn))
			ppage = pfn_to_page(pfn);
		pfn++;
		if (!ppage)
			pcount = 0;
		else
			pcount = page_mapcount(ppage);

		if (put_user(pcount, out++)) {
			ret = -EFAULT;
			break;
		}

		count -= KPMSIZE;
	}

	*ppos += (char __user *)out - buf;
	if (!ret)
		ret = (char __user *)out - buf;
	return ret;
}

static struct file_operations proc_kpagecount_operations = {
	.llseek = mem_lseek,
	.read = kpagecount_read,
};

/* /proc/kpageflags - an array exposing page flags
 *
 * Each entry is a u64 representing the corresponding
 * physical page flags.
 */

/* These macros are used to decouple internal flags from exported ones */

#define KPF_LOCKED     0
#define KPF_ERROR      1
#define KPF_REFERENCED 2
#define KPF_UPTODATE   3
#define KPF_DIRTY      4
#define KPF_LRU        5
#define KPF_ACTIVE     6
#define KPF_SLAB       7
#define KPF_WRITEBACK  8
#define KPF_RECLAIM    9
#define KPF_BUDDY     10

#define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)

static ssize_t kpageflags_read(struct file *file, char __user *buf,
			     size_t count, loff_t *ppos)
{
	u64 __user *out = (u64 __user *)buf;
	struct page *ppage;
	unsigned long src = *ppos;
	unsigned long pfn;
	ssize_t ret = 0;
	u64 kflags, uflags;

	pfn = src / KPMSIZE;
	count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
	if (src & KPMMASK || count & KPMMASK)
		return -EINVAL;

	while (count > 0) {
		ppage = NULL;
		if (pfn_valid(pfn))
			ppage = pfn_to_page(pfn);
		pfn++;
		if (!ppage)
			kflags = 0;
		else
			kflags = ppage->flags;

		uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
			kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
			kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
			kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
			kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
			kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
			kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
			kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
			kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
			kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
			kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);

		if (put_user(uflags, out++)) {
			ret = -EFAULT;
			break;
		}

		count -= KPMSIZE;
	}

	*ppos += (char __user *)out - buf;
	if (!ret)
		ret = (char __user *)out - buf;
	return ret;
}

static struct file_operations proc_kpageflags_operations = {
	.llseek = mem_lseek,
	.read = kpageflags_read,
};
#endif /* CONFIG_PROC_PAGE_MONITOR */

struct proc_dir_entry *proc_root_kcore;

void __init proc_misc_init(void)
{
	proc_symlink("mounts", NULL, "self/mounts");

	/* And now for trickier ones */
	proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
	proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
#ifdef CONFIG_BLOCK
	proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
#endif
#ifdef CONFIG_MODULES
	proc_create("modules", 0, NULL, &proc_modules_operations);
#endif
#ifdef CONFIG_SCHEDSTATS
	proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
#endif
#ifdef CONFIG_PROC_KCORE
	proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
	if (proc_root_kcore)
		proc_root_kcore->size =
				(size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
#endif
#ifdef CONFIG_PROC_PAGE_MONITOR
	proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
	proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
#endif
#ifdef CONFIG_PROC_VMCORE
	proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
#endif
}