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Re: [Qemu-devel] [PATCH v3 07/19] block: expect errors from bdrv_co_is_a

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v3 07/19] block: expect errors from bdrv_co_is_allocated
Date: Mon, 29 Jul 2013 16:03:47 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7

Il 29/07/2013 15:43, Kevin Wolf ha scritto:
> Am 25.07.2013 um 16:23 hat Paolo Bonzini geschrieben:
>> Some bdrv_is_allocated callers do not expect errors, but the fallback
>> in qcow2.c might make other callers trip on assertion failures or
>> infinite loops.
>> Fix the callers to always look for errors.
>> Cc: address@hidden
>> Reviewed-by: Eric Blake <address@hidden>
>> Signed-off-by: Paolo Bonzini <address@hidden>
> Good idea, but there seem to be a few more callers that don't handle
> errors yet. Not sure what your criterion for fixing callers or not was.
> Did you simply miss the rest?

In general, I didn't bother about callers that didn't handle *pnum = 0
correctly (for example block-migration.c and commit).  But I see now
that the ones in qemu-io-cmds.c are due to a bad rebase.

(BTW, I just noticed now that both block-migration.c and commit also run
outside a coroutine, and thus rely on bdrv_is_allocated creating one).


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