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-rw-r--r--fs/proc/devices.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/fs/proc/devices.c b/fs/proc/devices.c
new file mode 100644
index 000000000000..59ee7da959c9
--- /dev/null
+++ b/fs/proc/devices.c
@@ -0,0 +1,70 @@
1#include <linux/fs.h>
2#include <linux/init.h>
3#include <linux/proc_fs.h>
4#include <linux/seq_file.h>
5
6static int devinfo_show(struct seq_file *f, void *v)
7{
8 int i = *(loff_t *) v;
9
10 if (i < CHRDEV_MAJOR_HASH_SIZE) {
11 if (i == 0)
12 seq_printf(f, "Character devices:\n");
13 chrdev_show(f, i);
14 }
15#ifdef CONFIG_BLOCK
16 else {
17 i -= CHRDEV_MAJOR_HASH_SIZE;
18 if (i == 0)
19 seq_printf(f, "\nBlock devices:\n");
20 blkdev_show(f, i);
21 }
22#endif
23 return 0;
24}
25
26static void *devinfo_start(struct seq_file *f, loff_t *pos)
27{
28 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
29 return pos;
30 return NULL;
31}
32
33static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
34{
35 (*pos)++;
36 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
37 return NULL;
38 return pos;
39}
40
41static void devinfo_stop(struct seq_file *f, void *v)
42{
43 /* Nothing to do */
44}
45
46static const struct seq_operations devinfo_ops = {
47 .start = devinfo_start,
48 .next = devinfo_next,
49 .stop = devinfo_stop,
50 .show = devinfo_show
51};
52
53static int devinfo_open(struct inode *inode, struct file *filp)
54{
55 return seq_open(filp, &devinfo_ops);
56}
57
58static const struct file_operations proc_devinfo_operations = {
59 .open = devinfo_open,
60 .read = seq_read,
61 .llseek = seq_lseek,
62 .release = seq_release,
63};
64
65static int __init proc_devices_init(void)
66{
67 proc_create("devices", 0, NULL, &proc_devinfo_operations);
68 return 0;
69}
70module_init(proc_devices_init);