Description of problem:

Windows 8 guest disks cannot be mounted for write.  ntfs-3g gives the
following error:

mount -o  /dev/sda2 /sysroot/
The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
Failed to mount '/dev/sda2': Operation not permitted
The NTFS partition is in an unsafe state. Please resume and shutdown
Windows fully (no hibernation or fast restarting), or mount the volume
read-only with the 'ro' mount option.

For example in guestfish:

$ guestfish --rw -a /dev/vg_pin/Win8x32 -i
libguestfs: error: mount: /dev/sda2 on / (options: ''): The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
Failed to mount '/dev/sda2': Operation not permitted
The NTFS partition is in an unsafe state. Please resume and shutdown
Windows fully (no hibernation or fast restarting), or mount the volume
read-only with the 'ro' mount option.

(The same command works if you change --rw to --ro)

This page has a reasonable summary of the issue:
http://www.eightforums.com/tutorials/6320-fast-startup-turn-off-windows-8-a.html

We should document this problem, since there's probably no
easy way to work around it.

Version-Release number of selected component (if applicable):

libguestfs 1.19.64