mkfs_minix: use get_volume_size_in_bytes instead of local version

Hopefully this also closes 4730

function                                             old     new   delta
valid_offset                                          55       -     -55
mkfs_minix_main                                     2925    2674    -251
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-306)           Total: -306 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 14 insertions, 63 deletions

diff --git a/util-linux/mkfs_minix.c b/util-linux/mkfs_minix.c
index 59d7d23..49afd11 100644
--- a/util-linux/mkfs_minix.c
+++ b/util-linux/mkfs_minix.c
@@ -196,54 +196,6 @@ static void minix_clrbit(char *a, unsigned i)
 # define BLKGETSIZE     _IO(0x12,96)    /* return device size */
 #endif
 
-
-static long valid_offset(int fd, int offset)
-{
-	char ch;
-
-	if (lseek(fd, offset, SEEK_SET) < 0)
-		return 0;
-	if (read(fd, &ch, 1) < 1)
-		return 0;
-	return 1;
-}
-
-static int count_blocks(int fd)
-{
-	int high, low;
-
-	low = 0;
-	for (high = 1; valid_offset(fd, high); high *= 2)
-		low = high;
-
-	while (low < high - 1) {
-		const int mid = (low + high) / 2;
-
-		if (valid_offset(fd, mid))
-			low = mid;
-		else
-			high = mid;
-	}
-	valid_offset(fd, 0);
-	return (low + 1);
-}
-
-static int get_size(const char *file)
-{
-	int fd;
-	long size;
-
-	fd = xopen(file, O_RDWR);
-	if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
-		close(fd);
-		return (size * 512);
-	}
-
-	size = count_blocks(fd);
-	close(fd);
-	return size;
-}
-
 static void write_tables(void)
 {
 	/* Mark the superblock valid. */
@@ -636,7 +588,6 @@ int mkfs_minix_main(int argc UNUSED_PARAM, char **argv)
 {
 	unsigned opt;
 	char *tmp;
-	struct stat statbuf;
 	char *str_i;
 	char *listfile = NULL;
 
@@ -673,13 +624,17 @@ int mkfs_minix_main(int argc UNUSED_PARAM, char **argv)
 #endif
 	}
 
-	G.device_name = *argv++;
+	G.device_name = argv[0];
 	if (!G.device_name)
 		bb_show_usage();
-	if (*argv)
-		G.total_blocks = xatou32(*argv);
-	else
-		G.total_blocks = get_size(G.device_name) / 1024;
+
+	/* Check if it is mounted */
+	if (find_mount_point(G.device_name, 0))
+		bb_error_msg_and_die("can't format mounted filesystem");
+
+	xmove_fd(xopen(G.device_name, O_RDWR), dev_fd);
+
+	G.total_blocks = get_volume_size_in_bytes(dev_fd, argv[1], 1024, /*extend:*/ 1) / 1024;
 
 	if (G.total_blocks < 10)
 		bb_error_msg_and_die("must have at least 10 blocks");
@@ -690,25 +645,21 @@ int mkfs_minix_main(int argc UNUSED_PARAM, char **argv)
 			G.magic = MINIX2_SUPER_MAGIC;
 	} else if (G.total_blocks > 65535)
 		G.total_blocks = 65535;
-
-	/* Check if it is mounted */
-	if (find_mount_point(G.device_name, 0))
-		bb_error_msg_and_die("can't format mounted filesystem");
-
-	xmove_fd(xopen(G.device_name, O_RDWR), dev_fd);
+#if 0
+	struct stat statbuf;
 	xfstat(dev_fd, &statbuf, G.device_name);
+/* why? */
 	if (!S_ISBLK(statbuf.st_mode))
 		opt &= ~1; // clear -c (check)
-
+#if 0
 /* I don't know why someone has special code to prevent mkfs.minix
  * on IDE devices. Why IDE but not SCSI, etc?... */
-#if 0
 	else if (statbuf.st_rdev == 0x0300 || statbuf.st_rdev == 0x0340)
 		/* what is this? */
 		bb_error_msg_and_die("will not try "
 			"to make filesystem on '%s'", G.device_name);
 #endif
-
+#endif
 	tmp = G.root_block;
 	*(short *) tmp = 1;
 	strcpy(tmp + 2, ".");