[Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu

[Dietmar Maurer]

This series provides a way to efficiently backup VMs.

* Backup to a single archive file
* Backup contain all data to restore VM (full backup)
* Do not depend on storage type or image format
* Avoid use of temporary storage
* store sparse images efficiently

The file docs/backup.txt contains more details.

Changes since v1:

* fix spelling errors
* move BackupInfo from BDS to BackupBlockJob
* introduce BackupDriver to allow more than one backup format
* vma: add suport to store vmstate (size is not known in advance)
* add ability to store VM state

Changes since v2:

* BackupDriver: remove cancel_cb
* use enum for BackupFormat
* vma: use bdrv_open instead of bdrv_file_open
* vma: fix aio, use O_DIRECT
* backup one drive after another (try to avoid high load)

Changes since v3:

* move reviewer info from commit messages to cover-letter
* remove 'RFC' from log headers and file names
* removed comment about slow qcow2 snapshot bug
* fix spelling errors
* fixed copyright
* change 'backupfile' parameter name to 'backup-file'
* change 'config-filename' parameter name to 'config-file'
* add documentation for 'devlist' parameter.
* rename backup_cancel to backup-cancel


Dietmar Maurer (6):
  add documenation for new backup framework
  add basic backup support to block driver
  add backup related monitor commands
  introduce new vma archive format
  add regression tests for backup
  add vm state to backups

 Makefile                 |    3 +-
 Makefile.objs            |    1 +
 backup.c                 |  338 +++++++++++++++++
 backup.h                 |   45 +++
 block.c                  |   71 ++++-
 blockdev.c               |  617 ++++++++++++++++++++++++++++++
 docs/backup.txt          |  116 ++++++
 docs/specs/vma_spec.txt  |   24 ++
 hmp-commands.hx          |   31 ++
 hmp.c                    |   64 ++++
 hmp.h                    |    3 +
 include/block/block.h    |    2 +
 include/block/blockjob.h |   10 +
 monitor.c                |    7 +
 qapi-schema.json         |   98 +++++
 qmp-commands.hx          |   27 ++
 tests/Makefile           |   11 +-
 tests/backup-test.c      |  517 +++++++++++++++++++++++++
 vma-reader.c             |  799 +++++++++++++++++++++++++++++++++++++++
 vma-writer.c             |  932 ++++++++++++++++++++++++++++++++++++++++++++++
 vma.c                    |  559 +++++++++++++++++++++++++++
 vma.h                    |  145 +++++++
 22 files changed, 4411 insertions(+), 9 deletions(-)
 create mode 100644 backup.c
 create mode 100644 backup.h
 create mode 100644 docs/backup.txt
 create mode 100644 docs/specs/vma_spec.txt
 create mode 100644 tests/backup-test.c
 create mode 100644 vma-reader.c
 create mode 100644 vma-writer.c
 create mode 100644 vma.c
 create mode 100644 vma.h

-- 
1.7.2.5