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[Qemu-devel] [PATCH v2 00/11] Point-in-time snapshot exporting over NBD
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH v2 00/11] Point-in-time snapshot exporting over NBD |
Date: |
Wed, 17 Jul 2013 17:42:05 +0800 |
This series adds for point-in-time snapshot NBD exporting based on
blockdev-backup (variant of drive-backup with existing device as target). This
patch is built on top of imain's sync mode patches for drive-backup.
We get a thin point-in-time snapshot by COW mechanism of drive-backup, and
export it through built in NBD server. The steps are as below:
1. (SHELL) qemu-img create -f qcow2 BACKUP.qcow2 <source size here>
(Alternatively we can use -o backing_file=RUNNING-VM.img to omit explicitly
providing the size by ourselves, but it's risky because RUNNING-VM.qcow2 is
used r/w by guest. Whether or not setting backing file in the image file
doesn't matter, as we are going to override the backing hd in the next
step)
2. (HMP) drive_add backing=ide0-hd0,file=BACKUP.qcow2,id=target0,if=none
(where ide0-hd0 is the running BlockDriverState name for
RUNNING-VM.img. This patch implements "backing=" option to override
backing_hd for added drive)
3. (QMP) blockdev-backup device=ide0-hd0 sync=none target=target0
(this is the QMP command introduced by this series, which use a named
device as target of drive-backup)
4. (QMP) nbd-server-add device=target0
When image fleecing done:
1. (QMP) block-job-complete device=ide0-hd0
2. (HMP) drive_del target0
3. (SHELL) rm BACKUP.qcow2
v2:
* Introduce soft and hard reference count, compared to a single type of ref
count in v1.
* Add "backing=" option to drive_add.
* Introduce QMP command "blockdev-backup"
Fam Zheng (11):
block: replace in_use with refcnt_soft and refcnt_hard
block: use refcnt for bs->backing_hd and bs->file
block: use refcnt for drive_init/drive_uninit
block: use refcnt for device attach/detach
migration: omit drive ref as we have bdrv_ref now
xen_disk: simplify blk_disconnect with refcnt
block: hold hard reference for backup/mirror target
block: simplify bdrv_drop_intermediate
block: add assertion to check refcount before deleting
block: add option 'backing' to -drive options
qmp: add command 'blockdev-backup'
block-migration.c | 6 +-
block.c | 155 +++++++++++++++++++++-------------------
block/backup.c | 3 +-
block/blkdebug.c | 1 +
block/blkverify.c | 1 +
block/mirror.c | 4 +-
block/snapshot.c | 2 +-
block/stream.c | 2 +-
block/vvfat.c | 1 +
blockdev.c | 77 +++++++++++++++++++-
blockjob.c | 6 +-
hw/block/dataplane/virtio-blk.c | 4 +-
hw/block/xen_disk.c | 7 +-
include/block/block.h | 5 +-
include/block/block_int.h | 3 +-
qapi-schema.json | 49 +++++++++++++
qmp-commands.hx | 22 ++++++
17 files changed, 248 insertions(+), 100 deletions(-)
--
1.8.3.2
- [Qemu-devel] [PATCH v2 00/11] Point-in-time snapshot exporting over NBD,
Fam Zheng <=
- [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Fam Zheng, 2013/07/17
- Re: [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Paolo Bonzini, 2013/07/17
- Re: [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Stefan Hajnoczi, 2013/07/23
- Re: [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Fam Zheng, 2013/07/23
- Re: [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Stefan Hajnoczi, 2013/07/23
- Re: [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Fam Zheng, 2013/07/23
- Re: [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Stefan Hajnoczi, 2013/07/24
- Re: [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Fam Zheng, 2013/07/24
- Re: [Qemu-devel] [PATCH v2 01/11] block: replace in_use with refcnt_soft and refcnt_hard, Stefan Hajnoczi, 2013/07/25