[bug #43653] grub-probe fails to find ZFS VDEVs in /dev/mapper

[Jonathan Vaughn]

Follow-up Comment #8, bug #43653 (project grub):

Another example (to show what a raidz looks like, mirror is probably similar,
my previous example is a single drive pool)


address@hidden ~]# zdb -C storage

MOS Configuration:
        version: 5000
        name: 'storage'
        state: 0
        txg: 140131
        pool_guid: 17167584455341853717
        errata: 0
        hostname: 'localhost'
        vdev_children: 2
        vdev_tree:
            type: 'root'
            id: 0
            guid: 17167584455341853717
            create_txg: 4
            children[0]:
                type: 'raidz'
                id: 0
                guid: 16890424298360256069
                nparity: 2
                metaslab_array: 34
                metaslab_shift: 37
                ashift: 12
                asize: 20003866804224
                is_log: 0
                create_txg: 4
                children[0]:
                    type: 'disk'
                    id: 0
                    guid: 17777217965918563459
                    path: '/dev/sdb1'
                    whole_disk: 1
                    create_txg: 4
                children[1]:
                    type: 'disk'
                    id: 1
                    guid: 7290186694997986110
                    path: '/dev/sdg1'
                    whole_disk: 1
                    create_txg: 4
                children[2]:
                    type: 'disk'
                    id: 2
                    guid: 5903874119169633124
                    path: '/dev/sdc1'
                    whole_disk: 1
                    create_txg: 4
                children[3]:
                    type: 'disk'
                    id: 3
                    guid: 9042132936038593189
                    path: '/dev/sdf1'
                    whole_disk: 1
                    create_txg: 4
            children[1]:
                type: 'disk'
                id: 1
                guid: 10552128460515355461
                path:
'/dev/disk/by-id/ata-SanDisk_SDSSDA120G_999999999999-part1'
                whole_disk: 0
                metaslab_array: 107
                metaslab_shift: 24
                ashift: 9
                asize: 1018691584
                is_log: 1
                create_txg: 60548
        features_for_read:
            com.delphix:hole_birth
            com.delphix:embedded_data


This is not best example since this one is using /dev/sdX for it's members, so
would probably work as-is, but if it was using /dev/disk/by-id it wouldn't, so
just use your imagination. :)

Sadly, my C-fu is too weak to attempt writing any patches myself at the
moment. I haven't done any "real" C programming in probably a decade. I
glanced at the code and the output parsing would need to be rewritten since
the output is in a different format, but if that's done it should be fine.

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