| 1 | |
| 2 | #include <linux/fs.h>
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| 3 | #include <linux/init.h>
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| 4 | #include <linux/proc_fs.h>
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| 5 | #include <linux/seq_file.h>
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| 6 | #include <linux/blkdev.h>
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| 7 | #include "internal.h"
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| 8 |
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| 9 | static int devinfo_show(struct seq_file *f, void *v)
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| 10 | {
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| 11 | int i = *(loff_t *) v;
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| 12 |
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| 13 | if (i < CHRDEV_MAJOR_MAX) {
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| 14 | if (i == 0)
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| 15 | seq_puts(f, "Character devices:\n");
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| 16 | chrdev_show(f, i);
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| 17 | }
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| 18 | #ifdef CONFIG_BLOCK
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| 19 | else {
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| 20 | i -= CHRDEV_MAJOR_MAX;
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| 21 | if (i == 0)
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| 22 | seq_puts(f, "\nBlock devices:\n");
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| 23 | blkdev_show(f, i);
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| 24 | }
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| 25 | #endif
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| 26 | return 0;
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| 27 | }
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| 28 |
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| 29 | static void *devinfo_start(struct seq_file *f, loff_t *pos)
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| 30 | {
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| 31 | if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))
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| 32 | return pos;
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| 33 | return NULL;
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| 34 | }
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| 35 |
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| 36 | static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
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| 37 | {
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| 38 | (*pos)++;
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| 39 | if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))
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| 40 | return NULL;
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| 41 | return pos;
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| 42 | }
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| 43 |
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| 44 | static void devinfo_stop(struct seq_file *f, void *v)
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| 45 | {
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| 46 |
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| 47 | }
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| 48 |
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| 49 | static const struct seq_operations devinfo_ops = {
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| 50 | .start = devinfo_start,
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| 51 | .next = devinfo_next,
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| 52 | .stop = devinfo_stop,
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| 53 | .show = devinfo_show
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| 54 | };
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| 55 |
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| 56 | static int __init proc_devices_init(void)
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| 57 | {
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| 58 | struct proc_dir_entry *pde;
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| 59 |
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| 60 | pde = proc_create_seq("devices", 0, NULL, &devinfo_ops);
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| 61 | pde_make_permanent(pde);
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| 62 | return 0;
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| 63 | }
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| 64 | fs_initcall(proc_devices_init);
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