[Libguestfs] Remaining btrfs patches

[PATCH 1/7] mount: Add mount_vfs_nochroot This is significantly reworked from before. umount is gone as discussed, and variable motion is minimised. [PATCH 2/7] btrfs: Update btrfs_subvolume_list to take Already provisionally ACKed. Previous comment was that cleanup could be tidier. I looked into creating a new cleanup function for fs_buf, but it isn't possible (or simple, anyway) in this case for 2 reasons: 1. You'd need 2 arguments passed to the cleanup function, not one. Without fs->type you don't know whether fs_buf has been mounted or not. 2. You can't catch and report an error. [PATCH 3/7] mountable: Make list-filesystems return btrfsvols Already provisionally ACKed. [PATCH 4/7] New internal API: internal_parse_mountable [PATCH 5/7] inspect: Update inspect_os to use mountables [PATCH 6/7] btrfs: Make a stub Fedora btrfs guest for inspection [PATCH 7/7] mountable: Test inspection of fedora image Not previously reviewed.