LXR busybox/miscutils/partprobe.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
   4 *
   5 * Licensed under GPLv2, see file LICENSE in this source tree.
   6 */
   7//config:config PARTPROBE
   8//config:       bool "partprobe (3.5 kb)"
   9//config:       default y
  10//config:       help
  11//config:       Ask kernel to rescan partition table.
  12
  13//applet:IF_PARTPROBE(APPLET_NOEXEC(partprobe, partprobe, BB_DIR_USR_SBIN, BB_SUID_DROP, partprobe))
  14
  15//kbuild:lib-$(CONFIG_PARTPROBE) += partprobe.o
  16
  17#include <linux/fs.h>
  18#include "libbb.h"
  19#ifndef BLKRRPART
  20# define BLKRRPART _IO(0x12,95)
  21#endif
  22
  23//usage:#define partprobe_trivial_usage
  24//usage:        "DEVICE..."
  25//usage:#define partprobe_full_usage "\n\n"
  26//usage:        "Ask kernel to rescan partition table"
  27//
  28// partprobe (GNU parted) 3.2:
  29// -d, --dry-run        Don't update the kernel
  30// -s, --summary        Show a summary of devices and their partitions
  31
  32int partprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  33int partprobe_main(int argc UNUSED_PARAM, char **argv)
  34{
  35        getopt32(argv, "");
  36        argv += optind;
  37
  38        /* "partprobe" with no arguments just does nothing */
  39
  40        while (*argv) {
  41                int fd = xopen(*argv, O_RDONLY);
  42                /*
  43                 * Newer versions of parted scan partition tables themselves and
  44                 * use BLKPG ioctl (BLKPG_DEL_PARTITION / BLKPG_ADD_PARTITION)
  45                 * since this way kernel does not need to know
  46                 * partition table formats.
  47                 * We use good old BLKRRPART:
  48                 */
  49                ioctl_or_perror_and_die(fd, BLKRRPART, NULL, "%s", *argv);
  50                close(fd);
  51                argv++;
  52        }
  53
  54        return EXIT_SUCCESS;
  55}
  56