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64 lines
1.2 KiB
64 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/fs.h> |
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#include <linux/init.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/blkdev.h> |
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#include "internal.h" |
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static int devinfo_show(struct seq_file *f, void *v) |
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{ |
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int i = *(loff_t *) v; |
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if (i < CHRDEV_MAJOR_MAX) { |
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if (i == 0) |
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seq_puts(f, "Character devices:\n"); |
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chrdev_show(f, i); |
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} |
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#ifdef CONFIG_BLOCK |
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else { |
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i -= CHRDEV_MAJOR_MAX; |
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if (i == 0) |
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seq_puts(f, "\nBlock devices:\n"); |
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blkdev_show(f, i); |
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} |
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#endif |
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return 0; |
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} |
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static void *devinfo_start(struct seq_file *f, loff_t *pos) |
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{ |
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if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX)) |
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return pos; |
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return NULL; |
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} |
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static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos) |
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{ |
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(*pos)++; |
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if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX)) |
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return NULL; |
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return pos; |
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} |
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static void devinfo_stop(struct seq_file *f, void *v) |
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{ |
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/* Nothing to do */ |
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} |
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static const struct seq_operations devinfo_ops = { |
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.start = devinfo_start, |
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.next = devinfo_next, |
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.stop = devinfo_stop, |
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.show = devinfo_show |
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}; |
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static int __init proc_devices_init(void) |
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{ |
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struct proc_dir_entry *pde; |
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pde = proc_create_seq("devices", 0, NULL, &devinfo_ops); |
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pde_make_permanent(pde); |
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return 0; |
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} |
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fs_initcall(proc_devices_init);
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