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-rw-r--r--fs/proc/Makefile1
-rw-r--r--fs/proc/page.c147
-rw-r--r--fs/proc/proc_misc.c135
3 files changed, 148 insertions, 135 deletions
diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index b921f4475c9d..fef524410e86 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -24,3 +24,4 @@ proc-$(CONFIG_PROC_KCORE) += kcore.o
24proc-$(CONFIG_PROC_VMCORE) += vmcore.o 24proc-$(CONFIG_PROC_VMCORE) += vmcore.o
25proc-$(CONFIG_PROC_DEVICETREE) += proc_devtree.o 25proc-$(CONFIG_PROC_DEVICETREE) += proc_devtree.o
26proc-$(CONFIG_PRINTK) += kmsg.o 26proc-$(CONFIG_PRINTK) += kmsg.o
27proc-$(CONFIG_PROC_PAGE_MONITOR) += page.o
diff --git a/fs/proc/page.c b/fs/proc/page.c
new file mode 100644
index 000000000000..767d95a6d1b1
--- /dev/null
+++ b/fs/proc/page.c
@@ -0,0 +1,147 @@
1#include <linux/bootmem.h>
2#include <linux/compiler.h>
3#include <linux/fs.h>
4#include <linux/init.h>
5#include <linux/mm.h>
6#include <linux/mmzone.h>
7#include <linux/proc_fs.h>
8#include <linux/seq_file.h>
9#include <asm/uaccess.h>
10#include "internal.h"
11
12#define KPMSIZE sizeof(u64)
13#define KPMMASK (KPMSIZE - 1)
14/* /proc/kpagecount - an array exposing page counts
15 *
16 * Each entry is a u64 representing the corresponding
17 * physical page count.
18 */
19static ssize_t kpagecount_read(struct file *file, char __user *buf,
20 size_t count, loff_t *ppos)
21{
22 u64 __user *out = (u64 __user *)buf;
23 struct page *ppage;
24 unsigned long src = *ppos;
25 unsigned long pfn;
26 ssize_t ret = 0;
27 u64 pcount;
28
29 pfn = src / KPMSIZE;
30 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
31 if (src & KPMMASK || count & KPMMASK)
32 return -EINVAL;
33
34 while (count > 0) {
35 ppage = NULL;
36 if (pfn_valid(pfn))
37 ppage = pfn_to_page(pfn);
38 pfn++;
39 if (!ppage)
40 pcount = 0;
41 else
42 pcount = page_mapcount(ppage);
43
44 if (put_user(pcount, out++)) {
45 ret = -EFAULT;
46 break;
47 }
48
49 count -= KPMSIZE;
50 }
51
52 *ppos += (char __user *)out - buf;
53 if (!ret)
54 ret = (char __user *)out - buf;
55 return ret;
56}
57
58static const struct file_operations proc_kpagecount_operations = {
59 .llseek = mem_lseek,
60 .read = kpagecount_read,
61};
62
63/* /proc/kpageflags - an array exposing page flags
64 *
65 * Each entry is a u64 representing the corresponding
66 * physical page flags.
67 */
68
69/* These macros are used to decouple internal flags from exported ones */
70
71#define KPF_LOCKED 0
72#define KPF_ERROR 1
73#define KPF_REFERENCED 2
74#define KPF_UPTODATE 3
75#define KPF_DIRTY 4
76#define KPF_LRU 5
77#define KPF_ACTIVE 6
78#define KPF_SLAB 7
79#define KPF_WRITEBACK 8
80#define KPF_RECLAIM 9
81#define KPF_BUDDY 10
82
83#define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
84
85static ssize_t kpageflags_read(struct file *file, char __user *buf,
86 size_t count, loff_t *ppos)
87{
88 u64 __user *out = (u64 __user *)buf;
89 struct page *ppage;
90 unsigned long src = *ppos;
91 unsigned long pfn;
92 ssize_t ret = 0;
93 u64 kflags, uflags;
94
95 pfn = src / KPMSIZE;
96 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
97 if (src & KPMMASK || count & KPMMASK)
98 return -EINVAL;
99
100 while (count > 0) {
101 ppage = NULL;
102 if (pfn_valid(pfn))
103 ppage = pfn_to_page(pfn);
104 pfn++;
105 if (!ppage)
106 kflags = 0;
107 else
108 kflags = ppage->flags;
109
110 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
111 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
112 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
113 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
114 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
115 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
116 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
117 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
118 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
119 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
120 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
121
122 if (put_user(uflags, out++)) {
123 ret = -EFAULT;
124 break;
125 }
126
127 count -= KPMSIZE;
128 }
129
130 *ppos += (char __user *)out - buf;
131 if (!ret)
132 ret = (char __user *)out - buf;
133 return ret;
134}
135
136static const struct file_operations proc_kpageflags_operations = {
137 .llseek = mem_lseek,
138 .read = kpageflags_read,
139};
140
141static int __init proc_page_init(void)
142{
143 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
144 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
145 return 0;
146}
147module_init(proc_page_init);
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 5ed15ff8fd1d..2ef9ef9bc8c1 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -57,146 +57,11 @@
57#include <asm/div64.h> 57#include <asm/div64.h>
58#include "internal.h" 58#include "internal.h"
59 59
60#ifdef CONFIG_PROC_PAGE_MONITOR
61#define KPMSIZE sizeof(u64)
62#define KPMMASK (KPMSIZE - 1)
63/* /proc/kpagecount - an array exposing page counts
64 *
65 * Each entry is a u64 representing the corresponding
66 * physical page count.
67 */
68static ssize_t kpagecount_read(struct file *file, char __user *buf,
69 size_t count, loff_t *ppos)
70{
71 u64 __user *out = (u64 __user *)buf;
72 struct page *ppage;
73 unsigned long src = *ppos;
74 unsigned long pfn;
75 ssize_t ret = 0;
76 u64 pcount;
77
78 pfn = src / KPMSIZE;
79 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
80 if (src & KPMMASK || count & KPMMASK)
81 return -EINVAL;
82
83 while (count > 0) {
84 ppage = NULL;
85 if (pfn_valid(pfn))
86 ppage = pfn_to_page(pfn);
87 pfn++;
88 if (!ppage)
89 pcount = 0;
90 else
91 pcount = page_mapcount(ppage);
92
93 if (put_user(pcount, out++)) {
94 ret = -EFAULT;
95 break;
96 }
97
98 count -= KPMSIZE;
99 }
100
101 *ppos += (char __user *)out - buf;
102 if (!ret)
103 ret = (char __user *)out - buf;
104 return ret;
105}
106
107static struct file_operations proc_kpagecount_operations = {
108 .llseek = mem_lseek,
109 .read = kpagecount_read,
110};
111
112/* /proc/kpageflags - an array exposing page flags
113 *
114 * Each entry is a u64 representing the corresponding
115 * physical page flags.
116 */
117
118/* These macros are used to decouple internal flags from exported ones */
119
120#define KPF_LOCKED 0
121#define KPF_ERROR 1
122#define KPF_REFERENCED 2
123#define KPF_UPTODATE 3
124#define KPF_DIRTY 4
125#define KPF_LRU 5
126#define KPF_ACTIVE 6
127#define KPF_SLAB 7
128#define KPF_WRITEBACK 8
129#define KPF_RECLAIM 9
130#define KPF_BUDDY 10
131
132#define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
133
134static ssize_t kpageflags_read(struct file *file, char __user *buf,
135 size_t count, loff_t *ppos)
136{
137 u64 __user *out = (u64 __user *)buf;
138 struct page *ppage;
139 unsigned long src = *ppos;
140 unsigned long pfn;
141 ssize_t ret = 0;
142 u64 kflags, uflags;
143
144 pfn = src / KPMSIZE;
145 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
146 if (src & KPMMASK || count & KPMMASK)
147 return -EINVAL;
148
149 while (count > 0) {
150 ppage = NULL;
151 if (pfn_valid(pfn))
152 ppage = pfn_to_page(pfn);
153 pfn++;
154 if (!ppage)
155 kflags = 0;
156 else
157 kflags = ppage->flags;
158
159 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
160 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
161 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
162 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
163 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
164 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
165 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
166 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
167 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
168 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
169 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
170
171 if (put_user(uflags, out++)) {
172 ret = -EFAULT;
173 break;
174 }
175
176 count -= KPMSIZE;
177 }
178
179 *ppos += (char __user *)out - buf;
180 if (!ret)
181 ret = (char __user *)out - buf;
182 return ret;
183}
184
185static struct file_operations proc_kpageflags_operations = {
186 .llseek = mem_lseek,
187 .read = kpageflags_read,
188};
189#endif /* CONFIG_PROC_PAGE_MONITOR */
190
191void __init proc_misc_init(void) 60void __init proc_misc_init(void)
192{ 61{
193 proc_symlink("mounts", NULL, "self/mounts"); 62 proc_symlink("mounts", NULL, "self/mounts");
194 63
195 /* And now for trickier ones */ 64 /* And now for trickier ones */
196#ifdef CONFIG_PROC_PAGE_MONITOR
197 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
198 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
199#endif
200#ifdef CONFIG_PROC_VMCORE 65#ifdef CONFIG_PROC_VMCORE
201 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations); 66 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
202#endif 67#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-29 16:11:31 -0500