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Re: [Qemu-devel] [PATCH v3 12/18] block/backup: add 'always' bitmap sync

From: Max Reitz
Subject: Re: [Qemu-devel] [PATCH v3 12/18] block/backup: add 'always' bitmap sync policy
Date: Tue, 9 Jul 2019 20:46:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0

On 05.07.19 22:16, John Snow wrote:
> This adds an "always" policy for bitmap synchronization. Regardless of if
> the job succeeds or fails, the bitmap is *always* synchronized. This means
> that for backups that fail part-way through, the bitmap retains a record of
> which sectors need to be copied out to accomplish a new backup using the
> old, partial result.
> In effect, this allows us to "resume" a failed backup; however the new backup
> will be from the new point in time, so it isn't a "resume" as much as it is
> an "incremental retry." This can be useful in the case of extremely large
> backups that fail considerably through the operation and we'd like to not 
> waste
> the work that was already performed.
> Signed-off-by: John Snow <address@hidden>
> ---
>  block/backup.c       | 27 +++++++++++++++++++--------
>  qapi/block-core.json |  5 ++++-
>  2 files changed, 23 insertions(+), 9 deletions(-)

Reviewed-by: Max Reitz <address@hidden>

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