[libvirt] [PATCH v6 0/8] Incremental backups: virDomainSnapshot class

This is a respin of patch 4/20 in my larger series: https://www.redhat.com/archives/libvir-list/2019-March/msg00386.html As John pointed out, my v4/v5 posting had a LOT of duplicate code, including lots of poorly commented code managing a potential tree of checkpoints (even if the more immediate use tends to be a linear chain than a full-blown tree), all because I had copied-and-pasted from snapshot code. Copy-and-paste is technical debt; better is to get rid of the debt by refactoring the code for easy reuse. Here's as far as I got today, but hopefully reviewers agree that this glimpse of where things are headed is worthwhile, and I can start pushing these patches while continuing my cleanup work on the rest of the incremental backup stuff. Pre-series, virDomainSnapshotList() code in snapshot_conf.h can only compute a list of virDomainSnapshotPtrs; once this series is applied, that function will instead be changed to compute a list of virDomainMomentPtrs (which is then trivially cast to virDomainSnapshotPtr or virDomainCheckpointPtr as needed), so that all the code related to maintaining relationships between points in time can be shared rather than duplicated between snapshots and checkpoints. Eric Blake (8): snapshot: Split domain forward typedefs into new file snapshot: Sort virconftypes.h snapshot: Break out virDomainSnapshotObj into its own file snapshot: Export two functions prior to file split snapshot: Break out virDomainSnapshotObjList into its own file snapshot: Use accessors for virDomainSnapshot members snapshot: Create virDomainMoment base class backup: Introduce virDomainCheckpointPtr include/libvirt/virterror.h | 6 +- src/util/virerror.c | 12 +- include/libvirt/libvirt.h | 6 +- src/conf/domain_conf.h | 220 +--------- src/conf/snapshot_conf.h | 74 +--- src/conf/virconftypes.h | 281 +++++++++++++ src/conf/virdomainsnapshotobj.h | 50 +++ src/conf/virdomainsnapshotobjlist.h | 74 ++++ src/datatypes.h | 79 +++- src/conf/Makefile.inc.am | 5 + src/conf/domain_conf.c | 1 + src/conf/snapshot_conf.c | 608 +--------------------------- src/conf/virdomainobjlist.c | 1 + src/conf/virdomainsnapshotobj.c | 123 ++++++ src/conf/virdomainsnapshotobjlist.c | 553 +++++++++++++++++++++++++ src/datatypes.c | 132 ++++-- src/esx/esx_driver.c | 66 +-- src/libvirt-domain-snapshot.c | 26 +- src/libvirt_private.syms | 38 +- src/qemu/qemu_command.c | 1 + src/qemu/qemu_domain.c | 1 + src/qemu/qemu_driver.c | 41 +- src/qemu/qemu_migration.c | 1 + src/remote/remote_daemon_dispatch.c | 4 +- src/remote/remote_driver.c | 4 +- src/rpc/gendispatch.pl | 2 +- src/test/test_driver.c | 21 +- src/vbox/vbox_common.c | 56 +-- src/vz/vz_driver.c | 52 +-- 29 files changed, 1450 insertions(+), 1088 deletions(-) create mode 100644 src/conf/virconftypes.h create mode 100644 src/conf/virdomainsnapshotobj.h create mode 100644 src/conf/virdomainsnapshotobjlist.h create mode 100644 src/conf/virdomainsnapshotobj.c create mode 100644 src/conf/virdomainsnapshotobjlist.c -- 2.20.1