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:       select PLATFORM_LINUX
  11//config:       help
  12//config:       Ask kernel to rescan partition table.
  13
  14//applet:IF_PARTPROBE(APPLET_NOEXEC(partprobe, partprobe, BB_DIR_USR_SBIN, BB_SUID_DROP, partprobe))
  15
  16//kbuild:lib-$(CONFIG_PARTPROBE) += partprobe.o
  17
  18#include <linux/fs.h>
  19#include "libbb.h"
  20#ifndef BLKRRPART
  21# define BLKRRPART _IO(0x12,95)
  22#endif
  23
  24//usage:#define partprobe_trivial_usage
  25//usage:        "DEVICE..."
  26//usage:#define partprobe_full_usage "\n\n"
  27//usage:        "Ask kernel to rescan partition table"
  28//
  29// partprobe (GNU parted) 3.2:
  30// -d, --dry-run        Don't update the kernel
  31// -s, --summary        Show a summary of devices and their partitions
  32
  33int partprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  34int partprobe_main(int argc UNUSED_PARAM, char **argv)
  35{
  36        getopt32(argv, "");
  37        argv += optind;
  38
  39        /* "partprobe" with no arguments just does nothing */
  40
  41        while (*argv) {
  42                int fd = xopen(*argv, O_RDONLY);
  43                /*
  44                 * Newer versions of parted scan partition tables themselves and
  45                 * use BLKPG ioctl (BLKPG_DEL_PARTITION / BLKPG_ADD_PARTITION)
  46                 * since this way kernel does not need to know
  47                 * partition table formats.
  48                 * We use good old BLKRRPART:
  49                 */
  50                ioctl_or_perror_and_die(fd, BLKRRPART, NULL, "%s", *argv);
  51                close(fd);
  52                argv++;
  53        }
  54
  55        return EXIT_SUCCESS;
  56}
  57