f2fs_io: support freeze/thaw Support to freeze and thaw filesystem. Signed-off-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/man/f2fs_io.8 b/man/f2fs_io.8
index 708a583..5c3d204 100644
--- a/man/f2fs_io.8
+++ b/man/f2fs_io.8

@@ -215,6 +215,12 @@
 .B -v
 Verbose mode.
 .RE
+.TP
+\fBfreeze\fR \fI[directory]\fR
+Freeze filesystem that directory belongs to.
+.TP
+\fBthaw\fR \fI[directory]\fR
+Thaw filesystem that directory belongs to.
 .SH AUTHOR
 This version of
 .B f2fs_io

diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
index 9baea2b..1f26c7c 100644
--- a/tools/f2fs_io/f2fs_io.c
+++ b/tools/f2fs_io/f2fs_io.c

@@ -2454,6 +2454,52 @@
 	exit(0);
 }
 
+#define freeze_desc "freeze filesystem"
+#define freeze_help "f2fs_io freeze [directory_path]\n\n"
+
+static void do_freeze(int argc, char **argv, const struct cmd_desc *cmd)
+{
+	int ret, fd;
+
+	if (argc != 2) {
+		fputs("Excess arguments\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	fd = xopen(argv[1], O_DIRECTORY, 0);
+
+	ret = ioctl(fd, FIFREEZE);
+	if (ret < 0)
+		die_errno("FIFREEZE failed");
+
+	printf("freeze filesystem ret=%d\n", ret);
+	exit(0);
+}
+
+#define thaw_desc "thaw filesystem"
+#define thaw_help "f2fs_io thaw [directory_path]\n\n"
+
+static void do_thaw(int argc, char **argv, const struct cmd_desc *cmd)
+{
+	int ret, fd;
+
+	if (argc != 2) {
+		fputs("Excess arguments\n\n", stderr);
+		fputs(cmd->cmd_help, stderr);
+		exit(1);
+	}
+
+	fd = xopen(argv[1], O_DIRECTORY, 0);
+
+	ret = ioctl(fd, FITHAW);
+	if (ret < 0)
+		die_errno("FITHAW failed");
+
+	printf("thaw filesystem ret=%d\n", ret);
+	exit(0);
+}
+
 #define CMD_HIDDEN 	0x0001
 #define CMD(name) { #name, do_##name, name##_desc, name##_help, 0 }
 #define _CMD(name) { #name, do_##name, NULL, NULL, CMD_HIDDEN }
@@ -2504,6 +2550,8 @@
 	CMD(ftruncate),
 	CMD(test_create_perf),
 	CMD(test_lookup_perf),
+	CMD(freeze),
+	CMD(thaw),
 	{ NULL, NULL, NULL, NULL, 0 }
 };