1 files changed, 119 insertions, 0 deletions
diff --git a/disk-utils/resizepart.c b/disk-utils/resizepart.c
new file mode 100644
index 0000000..527517f
--- /dev/null
+++ b/disk-utils/resizepart.c
@@ -0,0 +1,119 @@
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "c.h"
+#include "nls.h"
+#include "partx.h"
+#include "sysfs.h"
+#include "strutils.h"
+#include "closestream.h"
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+	FILE *out = stdout;
+	fputs(USAGE_HEADER, out);
+	fprintf(out, _(" %s <disk device> <partition number> <length>\n"),
+		program_invocation_short_name);
+
+	fputs(USAGE_SEPARATOR, out);
+	fputs(_("Tell the kernel about the new size of a partition.\n"), out);
+
+	fputs(USAGE_OPTIONS, out);
+	printf(USAGE_HELP_OPTIONS(16));
+	printf(USAGE_MAN_TAIL("resizepart(8)"));
+	exit(EXIT_SUCCESS);
+}
+
+static int get_partition_start(int fd, int partno, uint64_t *start)
+{
+	struct stat st;
+	struct path_cxt *disk = NULL, *part = NULL;
+	dev_t devno = 0;
+	int rc = -1;
+
+	/*
+	 * wholedisk
+	 */
+	if (fstat(fd, &st) || !S_ISBLK(st.st_mode))
+		goto done;
+	devno = st.st_rdev;
+	disk = ul_new_sysfs_path(devno, NULL, NULL);
+	if (!disk)
+		goto done;
+	/*
+	 * partition
+	 */
+	devno = sysfs_blkdev_partno_to_devno(disk, partno);
+	if (!devno)
+		goto done;
+
+	part = ul_new_sysfs_path(devno, disk, NULL);
+	if (!part)
+		goto done;
+	if (ul_path_read_u64(part, start, "start"))
+		goto done;
+
+	rc = 0;
+done:
+	ul_unref_path(part);
+	ul_unref_path(disk);
+	return rc;
+}
+
+int main(int argc, char **argv)
+{
+	int c, fd, partno;
+	const char *wholedisk;
+	uint64_t start;
+
+	static const struct option longopts[] = {
+		{"help", no_argument, NULL, 'h'},
+		{"version", no_argument, NULL, 'V'},
+		{NULL, 0, NULL, '0'},
+	};
+
+	setlocale(LC_ALL, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+	atexit(close_stdout);
+
+	while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
+		switch (c) {
+		case 'V':
+			printf(UTIL_LINUX_VERSION);
+			return EXIT_SUCCESS;
+		case 'h':
+			usage();
+		default:
+			errtryhelp(EXIT_FAILURE);
+		}
+
+	if (argc != 4) {
+		warnx(_("not enough arguments"));
+		errtryhelp(EXIT_FAILURE);
+	}
+
+	wholedisk = argv[1];
+	partno = strtou32_or_err(argv[2], _("invalid partition number argument"));
+
+	if ((fd = open(wholedisk, O_RDONLY)) < 0)
+		err(EXIT_FAILURE, _("cannot open %s"), wholedisk);
+
+	if (get_partition_start(fd, partno, &start))
+		err(EXIT_FAILURE, _("%s: failed to get start of the partition number %s"),
+				wholedisk, argv[2]);
+
+	if (partx_resize_partition(fd, partno, start,
+			strtou64_or_err(argv[3], _("invalid length argument"))))
+		err(EXIT_FAILURE, _("failed to resize partition"));
+
+	if (close_fd(fd) != 0)
+		err(EXIT_FAILURE, _("write failed"));
+
+	return 0;
+}