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[Qemu-devel] [PATCH v16 0/8] Block replication for continuous checkpoint

From: Changlong Xie
Subject: [Qemu-devel] [PATCH v16 0/8] Block replication for continuous checkpoints
Date: Fri, 11 Mar 2016 18:34:07 +0800

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

You can get the detailed information about block replication from here:

Please refer to docs/block-replication.txt

This patch series is based on the following patch series:
1. http://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg02319.html 

Patch status:
1. Acked patches: none 
2. Reviewed patches: patch 4
3. Updated patches: patch 7, 8

You can get the patch here:

You can get the patch with framework here:

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

Changs Log:
1. Rebase to the newest codes
2. Address comments from Stefan & hailiang
p3: we don't need this patch now
p4: add "top-id" parameters for secondary
p6: fix NULL pointer in replication callbacks, remove unnecessary typedefs, 
add doc comments that explain the semantics of Replication
p7: Refactor AioContext for thread-safe, remove unnecessary get_top_bs()
*Note*: I'm working on replication testcase now, will send out in V17
1. Rebase to the newest codes
2. Fix typos and coding style addresed Eric's comments
3. Address Stefan's comments
   1) Make backup_do_checkpoint public, drop the changes on BlockJobDriver
   2) Update the message and description for [PATCH 4/9]
   3) Make replication_(start/stop/do_checkpoint)_all as global interfaces
   4) Introduce AioContext lock to protect start/stop/do_checkpoint callbacks
   5) Use BdrvChild instead of holding on to BlockDriverState * pointers
4. Clear BDRV_O_INACTIVE for hidden disk's open_flags since commit 09e0c771  
5. Introduce replication_get_error_all to check replication status
6. Remove useless discard interface
1. Implement auto complete active commit
2. Implement active commit block job for replication.c
3. Address the comments from Stefan, add replication-specific API and data
   structure, also remove old block layer APIs
1. Rebase to the newest codes
2. Remove redundant marcos and semicolon in replication.c 
3. Fix typos in block-replication.txt
1. Rebase to the newest codes
2. Use backing reference to replcace 'allow-write-backing-file'
1. Reopen the backing file when starting blcok replication if it is not
   opened in R/W mode
   when opening backing file
3. Block the top BDS so there is only one block job for the top BDS and
   its backing chain.
1. Use blockdev-remove-medium and blockdev-insert-medium to replace backing
2. Address the comments from Eric Blake
1. Update the error messages
2. Rebase to the newest qemu
3. Split child add/delete support. These patches are sent in another patchset.
1. Address Alberto Garcia's comments
1. Implement adding/removing quorum child. Remove the option non-connect.
2. Simplify the backing refrence option according to Stefan Hajnoczi's 
1. Rebase to the newest qemu.
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.
1. Introduce a new driver replication to avoid touch nbd and qcow2.
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
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

Changlong Xie (1):
  Introduce new APIs to do replication operation

Wen Congyang (7):
  unblock backup operations in backing file
  Backup: clear all bitmap when doing block checkpoint
  Link backup into block core
  docs: block replication's description
  auto complete active commit
  Implement new driver for block replication
  support replication driver in blockdev-add

 Makefile.objs              |   1 +
 block.c                    |  18 ++
 block/Makefile.objs        |   3 +-
 block/backup.c             |  15 ++
 block/mirror.c             |  13 +-
 block/replication.c        | 619 +++++++++++++++++++++++++++++++++++++++++++++
 blockdev.c                 |   2 +-
 docs/block-replication.txt | 238 +++++++++++++++++
 include/block/block_int.h  |   5 +-
 qapi/block-core.json       |  33 ++-
 qemu-img.c                 |   2 +-
 replication.c              |  94 +++++++
 replication.h              | 175 +++++++++++++
 13 files changed, 1208 insertions(+), 10 deletions(-)
 create mode 100644 block/replication.c
 create mode 100644 docs/block-replication.txt
 create mode 100644 replication.c
 create mode 100644 replication.h


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