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Re: [Qemu-devel] [PATCH V4 0/3] Block migration if any of the block devi
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH V4 0/3] Block migration if any of the block device is busy |
Date: |
Mon, 23 Jul 2012 15:58:20 +0100 |
On Mon, Jul 23, 2012 at 3:22 PM, <address@hidden> wrote:
> From: Benoît Canet <address@hidden>
>
> This patchset is designed to avoid starting a live migration while any of
> the block device is busy.
>
> Tested with the following sequence:
>
> QEMU 1.1.50 monitor - type 'help' for more information
> (qemu) block_stream virtio0 1k
> (qemu) migrate tcp:localhost:4444
> migrate: Migration is blocked by streaming
> (qemu) block_job_cancel virtio0
> (qemu) migrate tcp:localhost:4444
> migrate: Connection can not be completed immediately
> (qemu)
> => migration then succeed
>
> in v2:
> stefanha: Rename bdrv_have_block_jobs() to bdrv_are_busy() and make it return
> -EBUSY.
> paolo: remove spurious bdrv_close()
>
> in v3
> pm215: rewrite confusing error message
>
> in v4:
> stefanha: make the error message more general
>
> Benoît Canet (3):
> block: Add bdrv_are_busy()
> qerror: Add error telling that block dev usage prevents migration
> migration: block migration when streaming block jobs are running.
>
> block.c | 13 +++++++++++++
> block.h | 2 ++
> migration.c | 5 +++++
> qerror.c | 4 ++++
> qerror.h | 3 +++
> 5 files changed, 27 insertions(+)
>
> --
> 1.7.9.5
Reviewed-by: Stefan Hajnoczi <address@hidden>