| /* 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 (3.6 kb)" |
| //config: default y |
| //config: select PLATFORM_LINUX |
| //config: select LONG_OPTS |
| //config: help |
| //config: Halt new accesses and flush writes on a mounted filesystem. |
| |
| //applet:IF_FSFREEZE(APPLET(fsfreeze, BB_DIR_USR_SBIN, BB_SUID_DROP)) |
| |
| //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; |
| |
| applet_long_options = |
| "freeze\0" No_argument "\xff" |
| "unfreeze\0" No_argument "\xfe" |
| ; |
| /* exactly one non-option arg: the mountpoint */ |
| /* one of opts is required */ |
| /* opts are mutually exclusive */ |
| opt_complementary = "=1:""\xff:\xfe:""\xff--\xfe:\xfe--\xff"; |
| opts = getopt32(argv, ""); |
| |
| 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; |
| } |