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Re: [Qemu-block] [PATCH for-3.1 v10 19/31] block: Use bdrv_dirname() for

From: Alberto Garcia
Subject: Re: [Qemu-block] [PATCH for-3.1 v10 19/31] block: Use bdrv_dirname() for relative filenames
Date: Tue, 28 Aug 2018 15:45:09 +0200
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Thu 09 Aug 2018 11:35:16 PM CEST, Max Reitz wrote:
> bdrv_get_full_backing_filename_from_filename() breaks down when it comes
> to JSON filenames. Using bdrv_dirname() as the basis is better because
> since we have BDS, we can descend through the BDS tree to the protocol
> layer, which gives us a greater probability of finding a non-JSON name;
> also, bdrv_dirname() is more correct as it allows block drivers to
> override the generation of that directory name in a protocol-specific
> way.
> We still need to keep bdrv_get_full_backing_filename_from_filename(),
> though, because it has valid callers which need it during image creation
> when no BDS is available yet.
> This makes a test case in qemu-iotest 110, which was supposed to fail,
> work. That is actually good, but we need to change the reference output
> (and the comment in 110) accordingly.
> Signed-off-by: Max Reitz <address@hidden>

Reviewed-by: Alberto Garcia <address@hidden>


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