[Libguestfs] Fwd: is there a way to set discard=unmap when using guestmount? (#52)

[Richard W.M. Jones]

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Subject: [libguestfs/libguestfs] is there a way to set discard=unmap when using
	guestmount? (#52)

I cannot find anything in the document. This option is very important for dynamic qcow2 disks. Without out this the IO is super slow even on tmpfs only 3MB/s.


Subject: Re: [libguestfs/libguestfs] is there a way to set discard=unmap when
	using guestmount? (#52)

Not using guestmount, but it's possible to do it using the API directly and therefore from guestfish, something like this:
```
guestfish <<EOF
add disk.img discard:unmap
run
mount /dev/sda /
mount-local /tmp/mp
mount-local-run
EOF
```
See also: https://rwmj.wordpress.com/2012/03/29/libguestfs-mount-local/

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