projects / linux.git / blame
| 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> | |
| 6 | ||
| 7 | static int devinfo_show(struct seq_file *f, void *v) | |
| 8 | { | |
| 9 | int i = *(loff_t *) v; | |
| 10 | ||
| 8a932f73 | 11 | if (i < CHRDEV_MAJOR_MAX) { |
| fe251042 | 12 | if (i == 0) |
| 9d6de12f | 13 | seq_puts(f, "Character devices:\n"); |
| fe251042 AD |
14 | chrdev_show(f, i); |
| 15 | } | |
| 16 | #ifdef CONFIG_BLOCK | |
| 17 | else { | |
| 8a932f73 | 18 | i -= CHRDEV_MAJOR_MAX; |
| fe251042 | 19 | if (i == 0) |
| 9d6de12f | 20 | seq_puts(f, "\nBlock devices:\n"); |
| fe251042 AD |
21 | blkdev_show(f, i); |
| 22 | } | |
| 23 | #endif | |
| 24 | return 0; | |
| 25 | } | |
| 26 | ||
| 27 | static void *devinfo_start(struct seq_file *f, loff_t *pos) | |
| 28 | { | |
| 133d55cd | 29 | if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX)) |
| fe251042 AD |
30 | return pos; |
| 31 | return NULL; | |
| 32 | } | |
| 33 | ||
| 34 | static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos) | |
| 35 | { | |
| 36 | (*pos)++; | |
| 133d55cd | 37 | if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX)) |
| fe251042 AD |
38 | return NULL; |
| 39 | return pos; | |
| 40 | } | |
| 41 | ||
| 42 | static void devinfo_stop(struct seq_file *f, void *v) | |
| 43 | { | |
| 44 | /* Nothing to do */ | |
| 45 | } | |
| 46 | ||
| 47 | static const struct seq_operations devinfo_ops = { | |
| 48 | .start = devinfo_start, | |
| 49 | .next = devinfo_next, | |
| 50 | .stop = devinfo_stop, | |
| 51 | .show = devinfo_show | |
| 52 | }; | |
| 53 | ||
| fe251042 AD |
54 | static int __init proc_devices_init(void) |
| 55 | { | |
| fddda2b7 | 56 | proc_create_seq("devices", 0, NULL, &devinfo_ops); |
| fe251042 AD |
57 | return 0; |
| 58 | } | |
| abaf3787 | 59 | fs_initcall(proc_devices_init); |