fsfreeze: new command

[kzak@redhat.com: - cleanup
                  - add long options
                  - add note about DM to the man page
                  - use err.h and nls.h]

Signed-off-by: Hajime Taira <htaira@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 132 insertions, 0 deletions

diff --git a/sys-utils/fsfreeze.c b/sys-utils/fsfreeze.c
new file mode 100644
index 000000000..4ca6e5e2a
--- /dev/null
+++ b/sys-utils/fsfreeze.c
@@ -0,0 +1,132 @@
+/*
+ * fsfreeze.c -- Filesystem freeze/unfreeze IO for Linux
+ *
+ * Copyright (C) 2010 Hajime Taira <htaira@redhat.com>
+ *                    Masatake Yamato <yamato@redhat.com>
+ *
+ * This program is free software.  You can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation: either version 1 or
+ * (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <getopt.h>
+#include <err.h>
+
+#include "blkdev.h"
+#include "nls.h"
+#include "c.h"
+
+static int freeze_f(int fd)
+{
+	return ioctl(fd, FIFREEZE, 0);
+}
+
+static int unfreeze_f(int fd)
+{
+	return ioctl(fd, FITHAW, 0);
+}
+
+static void __attribute__((__noreturn__)) usage(FILE *out)
+{
+	fprintf(out, _("Usage: %s [options] <mount point>\n\nOptions:\n"),
+			program_invocation_short_name);
+
+	fprintf(out, _(
+		" -h, --help          this help\n"
+		" -f, --freeze        freeze the filesystem\n"
+		" -u, --unfreeze      unfreeze the filesystem\n"));
+
+	fprintf(out, _("\nFor more information see fsfreeze(8).\n"));
+
+	exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+	int fd = -1, c;
+	int freeze = -1, rc = EXIT_FAILURE;
+	char *path;
+	struct stat sb;
+
+	struct option longopts[] = {
+	    { "help",      0, 0, 'h' },
+	    { "freeze",    0, 0, 'f' },
+	    { "unfreeze",  0, 0, 'u' },
+	    { NULL,        0, 0, 0 }
+	};
+
+	setlocale(LC_ALL, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+
+	while ((c = getopt_long(argc, argv, "hfu", longopts, NULL)) != -1) {
+		switch(c) {
+		case 'h':
+			usage(stdout);
+			break;
+		case 'f':
+			freeze = TRUE;
+			break;
+		case 'u':
+			freeze = FALSE;
+			break;
+		default:
+			usage(stderr);
+			break;
+		}
+	}
+
+	if (freeze == -1)
+		errx(EXIT_FAILURE, _("no action specified"));
+	if (optind == argc)
+		errx(EXIT_FAILURE, _("no filename specified"));
+	path = argv[optind++];
+
+	if (optind != argc) {
+		warnx(_("unexpected number of arguments"));
+		usage(stderr);
+	}
+
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		err(EXIT_FAILURE, _("%s: open failed"), path);
+
+	if (fstat(fd, &sb) == -1) {
+		warn(_("%s: fstat failed"), path);
+		goto done;
+	}
+
+	if (!S_ISDIR(sb.st_mode)) {
+		warnx(_("%s: is not a directory"), path);
+		goto done;
+	}
+
+	if (freeze) {
+		if (freeze_f(fd)) {
+			warn(_("%s: freeze failed"), path);
+			goto done;
+		}
+	} else {
+		if (unfreeze_f(fd)) {
+			warn(_("%s: unfreeze failed"), path);
+			goto done;
+		}
+	}
+
+	rc = EXIT_SUCCESS;
+done:
+	if (fd >= 0)
+		close(fd);
+	return rc;
+}
+