[Qemu-devel] [PATCH 00/16] Block replication for continuous checkpoints

[Wen Congyang]

Block replication is a very important feature which is used for
continuous checkpoints(for example: COLO).

You can the detailed information about block replication from here:
http://wiki.qemu.org/Features/BlockReplication

Usage:
Please refer to docs/block-replication.txt

You can get the patch here:
https://github.com/coloft/qemu/tree/wency/block-replication-v9

You can get the patch with framework here:
https://github.com/coloft/qemu/commits/colo-v2.0-periodic-mode

TODO:
1. Continuous block replication. It will be started after basic functions
   are accepted.

Changs Log:
V9:
1. Update the error messages
2. Rebase to the newest qemu
3. Split child add/delete support. These patches are sent in another patchset.
V8:
1. Address Alberto Garcia's comments
V7:
1. Implement adding/removing quorum child. Remove the option non-connect.
2. Simplify the backing refrence option according to Stefan Hajnoczi's 
suggestion
V6:
1. Rebase to the newest qemu.
V5:
1. Address the comments from Gong Lei
2. Speed the failover up. The secondary vm can take over very quickly even
   if there are too many I/O requests.
V4:
1. Introduce a new driver replication to avoid touch nbd and qcow2.
V3:
1: use error_setg() instead of error_set()
2. Add a new block job API
3. Active disk, hidden disk and nbd target uses the same AioContext
4. Add a testcase to test new hbitmap API
V2:
1. Redesign the secondary qemu(use image-fleecing)
2. Use Error objects to return error message
3. Address the comments from Max Reitz and Eric Blake

Wen Congyang (16):
  introduce a new API to enable/disable attach device model
  introduce a new API to check if blk is attached
  allow writing to the backing file
  block: Allow references for backing files
  introduce a new API qemu_opts_absorb_qdict_by_index()
  quorum: allow ignoring child errors
  Backup: clear all bitmap when doing block checkpoint
  block: make bdrv_put_ref_bh_schedule() as a public API
  Allow creating backup jobs when opening BDS
  docs: block replication's description
  Add new block driver interfaces to control block replication
  skip nbd_target when starting block replication
  quorum: implement block driver interfaces for block replication
  Implement new driver for block replication
  support replication driver in blockdev-add
  Add a new API to start/stop replication, do checkpoint to all BDSes

 block.c                        | 230 +++++++++++++++++++-
 block/Makefile.objs            |   3 +-
 block/backup.c                 |  14 ++
 block/block-backend.c          |  33 +++
 block/quorum.c                 | 171 ++++++++++++++-
 block/replication.c            | 471 +++++++++++++++++++++++++++++++++++++++++
 blockdev.c                     |  37 +---
 blockjob.c                     |  11 +
 docs/block-replication.txt     | 183 ++++++++++++++++
 include/block/block.h          |  11 +
 include/block/block_int.h      |  14 ++
 include/block/blockjob.h       |  12 ++
 include/qemu/option.h          |   2 +
 include/sysemu/block-backend.h |   3 +
 qapi/block-core.json           |  43 +++-
 util/qemu-option.c             |  44 ++++
 16 files changed, 1234 insertions(+), 48 deletions(-)
 create mode 100644 block/replication.c
 create mode 100644 docs/block-replication.txt

-- 
2.4.3