b9512fa6b
Denys Vlasenko
2017-04-11
Subject
fsfreeze: new applet
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util-linux/fsfreeze.c+54 -0
| @@ -0,0 +1,54 @@ | |
| + | /* vi: set sw=4 ts=4: */ |
| + | /* |
| + | * Copyright (C) 2017 Denys Vlasenko <[email protected]> |
| + | * |
| + | * Licensed under GPLv2, see file LICENSE in this source tree. |
| + | */ |
| + | |
| + | //config:config FSFREEZE |
| + | //config: bool "fsfreeze" |
| + | //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_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; |
| + | } |