Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
fe251042 AD |
2 | #include <linux/fs.h> |
3 | #include <linux/init.h> | |
4 | #include <linux/proc_fs.h> | |
5 | #include <linux/seq_file.h> | |
3f1266f1 | 6 | #include <linux/blkdev.h> |
ef1d6178 | 7 | #include "internal.h" |
fe251042 AD |
8 | |
9 | static int devinfo_show(struct seq_file *f, void *v) | |
10 | { | |
11 | int i = *(loff_t *) v; | |
12 | ||
8a932f73 | 13 | if (i < CHRDEV_MAJOR_MAX) { |
fe251042 | 14 | if (i == 0) |
9d6de12f | 15 | seq_puts(f, "Character devices:\n"); |
fe251042 AD |
16 | chrdev_show(f, i); |
17 | } | |
18 | #ifdef CONFIG_BLOCK | |
19 | else { | |
8a932f73 | 20 | i -= CHRDEV_MAJOR_MAX; |
fe251042 | 21 | if (i == 0) |
9d6de12f | 22 | seq_puts(f, "\nBlock devices:\n"); |
fe251042 AD |
23 | blkdev_show(f, i); |
24 | } | |
25 | #endif | |
26 | return 0; | |
27 | } | |
28 | ||
29 | static void *devinfo_start(struct seq_file *f, loff_t *pos) | |
30 | { | |
133d55cd | 31 | if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX)) |
fe251042 AD |
32 | return pos; |
33 | return NULL; | |
34 | } | |
35 | ||
36 | static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos) | |
37 | { | |
38 | (*pos)++; | |
133d55cd | 39 | if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX)) |
fe251042 AD |
40 | return NULL; |
41 | return pos; | |
42 | } | |
43 | ||
44 | static void devinfo_stop(struct seq_file *f, void *v) | |
45 | { | |
46 | /* Nothing to do */ | |
47 | } | |
48 | ||
49 | static const struct seq_operations devinfo_ops = { | |
50 | .start = devinfo_start, | |
51 | .next = devinfo_next, | |
52 | .stop = devinfo_stop, | |
53 | .show = devinfo_show | |
54 | }; | |
55 | ||
fe251042 AD |
56 | static int __init proc_devices_init(void) |
57 | { | |
ef1d6178 AD |
58 | struct proc_dir_entry *pde; |
59 | ||
60 | pde = proc_create_seq("devices", 0, NULL, &devinfo_ops); | |
61 | pde_make_permanent(pde); | |
fe251042 AD |
62 | return 0; |
63 | } | |
abaf3787 | 64 | fs_initcall(proc_devices_init); |