[Qemu-devel] [PATCH v2 0/5]: QMP: Proper thin provisioning support

[Luiz Capitulino <lcapitulino@redhat.com>]

Roughly speaking, thin provisioning is a feature where the VM is started with
a small disk and space is allocated on demand.

It's already possible for QMP clients to implement this feature by using
the BLOCK_IO_ERROR event. However, the event can be missed. When this
happens QMP clients need a way to query if any block device has hit a
no space condition.

This is what this series is about: it extends the query-block command to
contain the disk's I/O status.

Please, note that this series depends on the following two other series:

 1. [PATCH 00/55] Block layer cleanup & fixes (by Markus)
 2. [PATCH 0/7]: Introduce the QemuState type (by me)

changelog
---------

v2

- Split the series in two (first part already sent)
- Rebased on top of Markus's block layer cleanup series and using BlockDevOps
- Only make the 'io-status' key available if the VM is stopped


 block.c           |   38 ++++++++++++++++++++++++++++++++++++++
 block.h           |   11 +++++++++++
 hw/ide/core.c     |   16 ++++++++++++++++
 hw/ide/internal.h |    2 ++
 hw/scsi-disk.c    |   18 ++++++++++++++++++
 hw/virtio-blk.c   |   14 ++++++++++++++
 qemu-tool.c       |    6 ++++++
 qmp-commands.hx   |    3 +++
 8 files changed, 108 insertions(+), 0 deletions(-)