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Description of problem:
Currently if we want to find the devices which is added to a btrfs filesystem, the only way is use blkid and compare the UUID. It is helpful if there is a API used to show the relationship between btrfs filesystem and devices.


Version-Release number of selected component (if applicable):
libguestfs-1.28.1-1.10.el7


How reproducible:
100%


Steps to Reproduce:
1.
2.


Actual results:


Expected results:


Additional info:

Added with
https://github.com/libguestfs/libguestfs/commit/e3d429d37d882d06f25991ea0076d0c3bef44e80
which is in libguestfs >= 1.33.29.

Fixed upstream, thanks Pino.  However new APIs for speculative
non-customer features are not RHEL 7.3 material, so I have
kicked this to RHEL 7.4 when undoubtedly we'll want to do yet
another rebase, and that will pick up this fix.

Verified with package:
libguestfs-1.36.3-1.el7.x86_64

Steps:
1. $ guestfish
><fs> scratch 1G
><fs> run
><fs> part-init /dev/sda gpt
><fs> part-add /dev/sda p 34 600000
><fs> part-add /dev/sda p 600001 1200000
><fs> part-add /dev/sda p 1200001 2097118
><fs> mkfs ext4 /dev/sda2
><fs> mkfs-btrfs "/dev/sda1 /dev/sda3"
><fs> list-filesystems
/dev/sda1: btrfs
/dev/sda2: ext4
/dev/sda3: btrfs
><fs> btrfs-filesystem-show /dev/sda1
/dev/sda1
/dev/sda3

Actual results:
The API lists all the associated devices of a btrfs filesystem. So Verified.

Additional info:
Pino provided the test steps. Thanks.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2023