For what it's worth I found btrfs-map-logical can produce mapping for raid5 (didn't test raid6) by specifying the extent block length. If that's omitted it only shows the device+mapping for the first strip. This example is a 3 disk raid5, with a 128KiB file all in a single extent. [root@f24s ~]# btrfs-map-logical -l 14157742080 /dev/VG/a mirror 1 logical 14157742080 physical 1109327872 device /dev/mapper/VG-a mirror 2 logical 14157742080 physical 2183069696 device /dev/mapper/VG-c [root@f24s ~]# btrfs-map-logical -l 14157742080 -b 131072 /dev/VG/a mirror 1 logical 14157742080 physical 1109327872 device /dev/mapper/VG-a mirror 1 logical 14157807616 physical 1075773440 device /dev/mapper/VG-b mirror 2 logical 14157742080 physical 2183069696 device /dev/mapper/VG-c mirror 2 logical 14157807616 physical 2183069696 device /dev/mapper/VG-c It's also possible to use -c and -o to copy the extent to a file and more easily diff it with a control file, rather than using dd. Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
