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Re: [Qemu-devel] [PATCH v7 0/8] block: Mirror discarded sectors
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [PATCH v7 0/8] block: Mirror discarded sectors |
Date: |
Thu, 11 Jun 2015 16:29:11 +0800 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Mon, 06/08 14:02, Stefan Hajnoczi wrote:
> On Mon, Jun 08, 2015 at 01:56:06PM +0800, Fam Zheng wrote:
> > v7: Fix the lost assignment of s->unmap.
> >
> > v6: Fix pnum in bdrv_get_block_status_above. [Paolo]
> >
> > v5: Rewrite patch 1.
> > Address Eric's comments on patch 3.
> > Add Eric's rev-by to patches 2 & 4.
> > Check BDRV_BLOCK_DATA in patch 3. [Paolo]
> >
> > This fixes the mirror assert failure reported by wangxiaolong:
> >
> > https://lists.gnu.org/archive/html/qemu-devel/2015-04/msg04458.html
> >
> > The direct cause is that hbitmap code couldn't handle unset of bits *after*
> > iterator's current position. We could fix that, but the bdrv_reset_dirty()
> > call
> > is more questionable:
> >
> > Before, if guest discarded some sectors during migration, it could see
> > different data after moving to dest side, depending on block backends of the
> > src and the dest. This is IMO worse than mirroring the actual reading as
> > done
> > in this series, because we don't know what the guest is doing.
> >
> > For example if a guest first issues WRITE SAME to wipe out the area then
> > issues
> > UNMAP to discard it, just to get rid of some sensitive data completely, we
> > may
> > miss both operations and leave stale data on dest image.
> >
> >
> > Fam Zheng (8):
> > block: Add bdrv_get_block_status_above
> > qmp: Add optional bool "unmap" to drive-mirror
> > mirror: Do zero write on target if sectors not allocated
> > block: Fix dirty bitmap in bdrv_co_discard
> > block: Remove bdrv_reset_dirty
> > qemu-iotests: Make block job methods common
> > qemu-iotests: Add test case for mirror with unmap
> > iotests: Use event_wait in wait_ready
> >
> > block.c | 12 --------
> > block/io.c | 60 ++++++++++++++++++++++++++++++---------
> > block/mirror.c | 28 +++++++++++++++---
> > blockdev.c | 5 ++++
> > hmp.c | 2 +-
> > include/block/block.h | 4 +++
> > include/block/block_int.h | 4 +--
> > qapi/block-core.json | 8 +++++-
> > qmp-commands.hx | 3 ++
> > tests/qemu-iotests/041 | 66
> > ++++++++++---------------------------------
> > tests/qemu-iotests/132 | 59 ++++++++++++++++++++++++++++++++++++++
> > tests/qemu-iotests/132.out | 5 ++++
> > tests/qemu-iotests/group | 1 +
> > tests/qemu-iotests/iotests.py | 23 +++++++++++++++
> > 14 files changed, 196 insertions(+), 84 deletions(-)
> > create mode 100644 tests/qemu-iotests/132
> > create mode 100644 tests/qemu-iotests/132.out
> >
> > --
> > 2.4.2
> >
>
> Thanks, applied to my block tree:
> https://github.com/stefanha/qemu/commits/block
Stefan,
The only controversial patches are the qmp/drive-mirror ones (1-3), while
patches 4-8 are still useful on their own: they fix the mentioned crash and
improve iotests.
Shall we merge the second half (of course none of them depend on 1-3) now that
softfreeze is approaching?
Fam
- [Qemu-devel] [PATCH v7 2/8] qmp: Add optional bool "unmap" to drive-mirror, (continued)
- [Qemu-devel] [PATCH v7 2/8] qmp: Add optional bool "unmap" to drive-mirror, Fam Zheng, 2015/06/08
- [Qemu-devel] [PATCH v7 3/8] mirror: Do zero write on target if sectors not allocated, Fam Zheng, 2015/06/08
- [Qemu-devel] [PATCH v7 4/8] block: Fix dirty bitmap in bdrv_co_discard, Fam Zheng, 2015/06/08
- [Qemu-devel] [PATCH v7 5/8] block: Remove bdrv_reset_dirty, Fam Zheng, 2015/06/08
- [Qemu-devel] [PATCH v7 6/8] qemu-iotests: Make block job methods common, Fam Zheng, 2015/06/08
- [Qemu-devel] [PATCH v7 7/8] qemu-iotests: Add test case for mirror with unmap, Fam Zheng, 2015/06/08
- [Qemu-devel] [PATCH v7 8/8] iotests: Use event_wait in wait_ready, Fam Zheng, 2015/06/08
- Re: [Qemu-devel] [PATCH v7 0/8] block: Mirror discarded sectors, Stefan Hajnoczi, 2015/06/08
- Re: [Qemu-devel] [PATCH v7 0/8] block: Mirror discarded sectors,
Fam Zheng <=
- Re: [Qemu-devel] [Qemu-stable] [PATCH v7 0/8] block: Mirror discarded sectors, Fam Zheng, 2015/06/24
- Re: [Qemu-devel] [Qemu-stable] [PATCH v7 0/8] block: Mirror discarded sectors, Paolo Bonzini, 2015/06/24
- Re: [Qemu-devel] [Qemu-stable] [PATCH v7 0/8] block: Mirror discarded sectors, Fam Zheng, 2015/06/24
- Re: [Qemu-devel] [Qemu-stable] [PATCH v7 0/8] block: Mirror discarded sectors, Fam Zheng, 2015/06/25
- Re: [Qemu-devel] [Qemu-stable] [PATCH v7 0/8] block: Mirror discarded sectors, Alexandre DERUMIER, 2015/06/26
- Re: [Qemu-devel] [Qemu-stable] [PATCH v7 0/8] block: Mirror discarded sectors, Alexandre DERUMIER, 2015/06/26
- Re: [Qemu-devel] [Qemu-stable] [PATCH v7 0/8] block: Mirror discarded sectors, Fam Zheng, 2015/06/28
Re: [Qemu-devel] [PATCH v7 0/8] block: Mirror discarded sectors, Stefan Hajnoczi, 2015/06/26