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partprobe: new applet

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function                                             old     new   delta
partprobe_main                                         -      79     +79
packed_usage                                       31485   31511     +26
applet_names                                        2608    2618     +10
applet_main                                         1512    1516      +4
applet_install_loc                                   189     190      +1
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(add/remove: 2/0 grow/shrink: 4/0 up/down: 120/0)             Total: 120 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-04-11 19:17:59 +02:00
parent 1bc0bd13b5
commit ac47a00e2e
1 changed files with 56 additions and 0 deletions
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56
miscutils/partprobe.c Normal file
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/* vi: set sw=4 ts=4: */
/*
* Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config PARTPROBE
//config: bool "partprobe"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: Ask kernel to rescan partition table.
//applet:IF_PARTPROBE(APPLET(partprobe, BB_DIR_USR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_PARTPROBE) += partprobe.o
#include <linux/fs.h>
#include "libbb.h"
#ifndef BLKRRPART
# define BLKRRPART _IO(0x12,95)
#endif
//usage:#define partprobe_trivial_usage
//usage: "DEVICE..."
//usage:#define partprobe_full_usage "\n\n"
//usage: "Ask kernel to rescan partition table"
//
// partprobe (GNU parted) 3.2:
// -d, --dry-run Don't update the kernel
// -s, --summary Show a summary of devices and their partitions
int partprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int partprobe_main(int argc UNUSED_PARAM, char **argv)
{
getopt32(argv, "");
argv += optind;
/* "partprobe" with no arguments just does nothing */
while (*argv) {
int fd = xopen(*argv, O_RDONLY);
/*
* Newer versions of parted scan partition tables themselves and
* use BLKPG ioctl (BLKPG_DEL_PARTITION / BLKPG_ADD_PARTITION)
* since this way kernel does not need to know
* partition table formats.
* We use good old BLKRRPART:
*/
ioctl_or_perror_and_die(fd, BLKRRPART, NULL, "%s", *argv);
close(fd);
argv++;
}
return EXIT_SUCCESS;
}