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Re: [Qemu-block] [PATCH for-4.0] qemu-img: Gracefully shutdown when map

From: Kevin Wolf
Subject: Re: [Qemu-block] [PATCH for-4.0] qemu-img: Gracefully shutdown when map can't finish
Date: Thu, 28 Mar 2019 13:14:32 +0100
User-agent: Mutt/1.11.3 (2019-02-01)

Am 26.03.2019 um 19:40 hat Eric Blake geschrieben:
> Trying 'qemu-img map -f raw nbd://localhost:10809' causes the
> NBD server to output a scary message:
> qemu-nbd: Disconnect client, due to: Failed to read request: Unexpected 
> end-of-file before all bytes were read
> This is because the NBD client, being remote, has no way to expose a
> human-readable map (the --output=json data is fine, however). But
> because we exit(1) right after the message, causing the client to
> bypass all block cleanup, the server sees the abrupt exit and warns,
> whereas it would be silent had the client had a chance to send
> NBD_CMD_DISC. Other protocols may have similar cleanup issues, where
> failure to blk_unref() could cause unintended effects.
> Signed-off-by: Eric Blake <address@hidden>

Reviewed-by: Kevin Wolf <address@hidden>

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