[Libguestfs] [PATCH v2] lib: add support for disks with 4096 bytes sector size

[Richard W.M. Jones]

I pushed this with some trailing whitespace fixes, and I dropped the
change to tmp/.gitignore since the test does clean up after itself.  I
also fixed test-qemu-drive-with-blocksize-libvirt.sh so it doesn't
actually open /dev/sda etc on the host (don't run tests as root!)

However ...

We already use blocksize as an optional parameter to mkfs.  While they
don't directly conflict, it is confusing.  Is there a reason we
shouldn't call this new parameter "sectorsize"?

We can change the parameter name any time up til we make the next
stable release.

Rich.

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