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From: Kevin Wolf <kwolf@redhat.com>
To: Max Reitz <mreitz@redhat.com>
Cc: Eric Blake <eblake@redhat.com>,
	qemu-devel@nongnu.org, qemu-block@nongnu.org
Subject: Re: [PATCH] block: BDRV_O_NO_IO for backing file on creation
Date: Wed, 23 Jun 2021 13:26:03 +0200	[thread overview]
Message-ID: <YNMaS6ER8bpF1o6f@redhat.com> (raw)
In-Reply-To: <20210622140030.212487-1-mreitz@redhat.com>

Am 22.06.2021 um 16:00 hat Max Reitz geschrieben:
> When creating an image file with a backing file, we generally try to
> open the backing file (unless -u was specified), mostly to verify that
> it is there, but also to get the file size if none was specified for the
> new image.
> 
> For neither of these things do we need data I/O, and so we can pass
> BDRV_O_NO_IO when opening the backing file.  This allows us to open even
> encrypted backing images without requiring the user to provide a secret.
> 
> This makes the -u switch in iotests 189 and 198 unnecessary (and the
> $size parameter), so drop it, because this way we get regression tests
> for this patch here.
> 
> Fixes: https://gitlab.com/qemu-project/qemu/-/issues/441
> Signed-off-by: Max Reitz <mreitz@redhat.com>

Thanks, applied to the block branch.

Kevin



      reply	other threads:[~2021-06-23 11:27 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-22 14:00 [PATCH] block: BDRV_O_NO_IO for backing file on creation Max Reitz
2021-06-23 11:26 ` Kevin Wolf [this message]

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