mirror of
https://git.busybox.net/busybox.git
synced 2024-11-30 17:13:32 +08:00
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/* 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 FSFREEZE
|
|
//config: bool "fsfreeze (3.7 kb)"
|
|
//config: default y
|
|
//config: select LONG_OPTS
|
|
//config: help
|
|
//config: Halt new accesses and flush writes on a mounted filesystem.
|
|
|
|
//applet:IF_FSFREEZE(APPLET_NOEXEC(fsfreeze, fsfreeze, BB_DIR_USR_SBIN, BB_SUID_DROP, fsfreeze))
|
|
|
|
//kbuild:lib-$(CONFIG_FSFREEZE) += fsfreeze.o
|
|
|
|
//usage:#define fsfreeze_trivial_usage
|
|
//usage: "--[un]freeze MOUNTPOINT"
|
|
//usage:#define fsfreeze_full_usage "\n\n"
|
|
//usage: "Flush and halt writes to MOUNTPOINT"
|
|
|
|
#include "libbb.h"
|
|
#include <linux/fs.h>
|
|
|
|
#ifndef FIFREEZE
|
|
# define FIFREEZE _IOWR('X', 119, int)
|
|
# define FITHAW _IOWR('X', 120, int)
|
|
#endif
|
|
|
|
int fsfreeze_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int fsfreeze_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
unsigned opts;
|
|
int fd;
|
|
|
|
/* exactly one non-option arg: the mountpoint */
|
|
/* one of opts is required */
|
|
/* opts are mutually exclusive */
|
|
opts = getopt32long(argv, "^"
|
|
"" /* no opts */
|
|
"\0" "=1:""\xff:\xfe:""\xff--\xfe:\xfe--\xff",
|
|
"freeze\0" No_argument "\xff"
|
|
"unfreeze\0" No_argument "\xfe"
|
|
);
|
|
|
|
fd = xopen(argv[optind], O_RDONLY);
|
|
/* Works with NULL arg on linux-4.8.0 */
|
|
xioctl(fd, (opts & 1) ? FIFREEZE : FITHAW, NULL);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|