2:43 p.m.
The purpose of these patches is to introduce quorum for libvirt
I've try to follow this proposal:
http://www.redhat.com/archives/libvir-list/2014-May/msg00533.html
This feature ask for 6 task:
1) Allow a _virStorageSource to contain more than one backing store.
Because all the actual libvirt code use the backingStore field
as a pointer and we needs want to change that, I've decide to encapsulate
the backingStore field to simplifie the array manipulation.
2) Add the missing field a quorum need in _virStorageSource and
the VIR_STORAGE_TYPE_QUORUM and VIR_STORAGE_FILE_QUORUM in
their respectives enums.
3) Parse and format the xml
Because a quorum allows to have more than one backing store at the same level
we need to change virDomainDiskDefFormat and virDomainDiskDefParseXML
to call virDomainDiskBackingStoreFormat and virDomainDiskBackingStoreParse
in a loop.
virDomainDiskBackingStoreFormat and virDomainDiskBackingStoreParse can
call themself recursively in a loop because a quorum can contain another
quorum
4) Build qemu string
As for the xml, we have to call the function which create quorum recursively.
But this task have the problem explained here:
http://www.redhat.com/archives/libvir-list/2014-October/msg00529.html
The _virStorageSource missing some informations that can be passed to
a child, and therefore this version of quorum is incomplet.
5) Allow to hotplug/change a disk in a quorum
This part is not present in these patches because for this task
we have to use blockdev-add, and currently libvirt use
device_add for hotpluging that doesn't allow to hotplug quorum childs.
There is 3 way to handle this problem:
1) create a virDomainBlockDevAdd function in libvirt witch call
blockdev-add.
2) use blockdev-add instead of device_add in qemuMonitorJSONAddDevice
3) write a hack which uses blockdev-add only when attaching a quorum child
V2:
-Rebase on master
-Add Documentation
V3:
-Transforme the backingStore field in virStorageSource into
an array of pointer instead of a pointer
-Modify virStorageSourceSetBackingStore to allow it to expand
the backingStore size.
V4:
-Rebase on master
V5:
-Rebase on master
-patch 1-4/9: use patchs from John Ferlan
-patch 4/9: check return of virStorageSourceSetBackingStore
-patch 5/9: report type of error on virStorageSourceSetBackingStore
v6 note:
First at all, I'm sorry for the time between v5 and v6,
I had other projects to work on and was unable to work at full time
on libvirt, moreover I've try at first to support all snapshot and
block jobs operations for quorum, but encounter a lot a problems.
At the end I had a versions which was only handling some few operations,
so I've block all unsupported operations for quorum,
I plan to continue working on the quorum unsupported operations,
and send it when it will be ready, but in the meantime I hope to upstream
this serie of patch which should provide a very basic(but stable)
quorum suport.
v6 modifications:
-Rebase on master
-Remove node-name patch
-patch 06/13: Add virStorageSourceIsRAID
-patch 10/13: Add virDomainDefHasRAID
-patch 11-13/13: Block all unsupported operations
Matthias Gatto (13):
virstoragefile: Add virStorageSourceGetBackingStore
virstoragefile: Always use virStorageSourceGetBackingStore to get
backing store
virstoragefile: Add virStorageSourceSetBackingStore
virstoragefile: Always use virStorageSourceSetBackingStore to set
backing store
virstoragefile: change backingStore to backingStores.
virstoragefile: Add virStorageSourceIsRAID
virstoragefile: Add quorum in virstoragefile
domain_conf: Read and Write quorum config
qemu: Add quorum support in qemuBuildDriveDevStr
domain: add virDomainDefHasRAID
qemu: Block snapshot operation with RAID
qemu: qemuDomainGetBlockInfo quorum support
qemu: qemuDiskPathToAlias quorum support
docs/formatdomain.html.in | 23 +++-
docs/schemas/domaincommon.rng | 21 +++-
docs/schemas/storagecommon.rng | 1 +
docs/schemas/storagevol.rng | 1 +
src/conf/domain_conf.c | 196 +++++++++++++++++++++++++---------
src/conf/domain_conf.h | 1 +
src/conf/storage_conf.c | 23 ++--
src/libvirt_private.syms | 4 +
src/qemu/qemu_cgroup.c | 4 +-
src/qemu/qemu_command.c | 94 ++++++++++++++++
src/qemu/qemu_domain.c | 2 +-
src/qemu/qemu_driver.c | 50 ++++++---
src/qemu/qemu_migration.c | 1 +
src/qemu/qemu_monitor_json.c | 4 +-
src/security/security_dac.c | 2 +-
src/security/security_selinux.c | 4 +-
src/security/virt-aa-helper.c | 2 +-
src/storage/storage_backend.c | 22 ++--
src/storage/storage_backend_fs.c | 38 ++++---
src/storage/storage_backend_gluster.c | 11 +-
src/storage/storage_backend_logical.c | 15 ++-
src/storage/storage_driver.c | 3 +-
src/util/virstoragefile.c | 118 +++++++++++++++++---
src/util/virstoragefile.h | 15 ++-
tests/virstoragetest.c | 18 ++--
25 files changed, 523 insertions(+), 150 deletions(-)
--
2.6.1