add wipefs to 'mkfs.ntfs --fast'

[wangyugui]

Hi,

'mkfs.ntfs --fast' failed to overwrite the existing filesystem. so, we need add wipefs to 'mkfs.ntfs --fast'

version: v2022.5.17

# mkfs.btrfs -f /dev/vdb1
# wipefs /dev/vdb1
DEVICE OFFSET  TYPE  UUID                                 LABEL
vdb1   0x10040 btrfs 8bcc3d4f-a878-4caa-a992-5bebd8cfea55
# mkfs.ntfs  --fast /dev/vdb1
Cluster size has been automatically set to 4096 bytes.
Creating NTFS volume structures.
mkntfs completed successfully. Have a nice day.
# mount /dev/vdb1 /mnt/test/
mount: /dev/vdb1: more filesystems detected. This should not happen,
       use -t <type> to explicitly specify the filesystem type or
       use wipefs(8) to clean up the device.
# wipefs /dev/vdb1
DEVICE OFFSET  TYPE  UUID                                 LABEL
vdb1   0x3     ntfs  6DEE42C2228DCC8C
vdb1   0x10040 btrfs 8bcc3d4f-a878-4caa-a992-5bebd8cfea55
vdb1   0x1fe   dos
#

[wangyugui]

we need to detect the exist filesystem and ' -F, --force' to overwrite it?

[wangyugui]

a dirty fix to wipefs when 'mkfs.ntfs --fast'

@@ -3539,6 +3539,12 @@ static BOOL mkntfs_open_partition(ntfs_volume *vol)
 		}
 		ntfs_log_warning("mkntfs forced anyway. Hope /etc/mtab is incorrect.\n");
 	}
+	{
+		static u8 zero_to_wipefs[256*1024];
+		vol->dev->d_ops->seek(vol->dev, 0, SEEK_SET);
+		mkntfs_write(vol->dev, &zero_to_wipefs, sizeof(zero_to_wipefs));
+		vol->dev->d_ops->seek(vol->dev, 0, SEEK_SET);
+	}
 	result = TRUE;
 done:
 	return result;