[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH V4 5/5] block: make all steps in qmp_transaction
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH V4 5/5] block: make all steps in qmp_transaction() as callback |
Date: |
Fri, 03 May 2013 08:46:38 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130402 Thunderbird/17.0.5 |
On 05/01/2013 08:26 PM, Wenchao Xia wrote:
> Make it easier to add other operations to qmp_transaction() by using
> callbacks, with external snapshots serving as an example implementation
> of the callbacks.
>
> Signed-off-by: Wenchao Xia <address@hidden>
> ---
> blockdev.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++-------------
> 1 files changed, 71 insertions(+), 21 deletions(-)
>
> +/*
> + * This structure must be arranged as first member in parent type, assuming
To me, "parent type" seems like the wrong relationship - in C++, the
parent type is the smaller type, and the child type is the larger type
that includes the parent type as its first member. That is,
BlkTransationStates IS the parent type, and the comment would read
better as "first member in child type".
> + * that compiler will also arrange it to the same address with parent
> instance.
> + * Later it will be used in free().
> + */
> +struct BlkTransactionStates {
> + BlockdevAction *action;
> + const BdrvActionOps *ops;
> + QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
> +};
>
>
> /* Now we are going to do the actual pivot. Everything up to this point
> * is reversible, but we are committed at this point */
Is this comment still correct, now that things are extensible, or should
you s/pivot/commit/?
If you do respin, I agree that s/rollback/abort/ might be a nicer name
for that particular callback. But I'm also quite okay with using the
patch as-is without a respin (while I pointed out two possible comment
wording changes, they don't make or break the patch for me).
Reviewed-by: Eric Blake <address@hidden>
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
signature.asc
Description: OpenPGP digital signature
- [Qemu-devel] [PATCH V4 0/5] block: make qmp_transaction extendable, Wenchao Xia, 2013/05/01
- [Qemu-devel] [PATCH V4 1/5] block: package preparation code in qmp_transaction(), Wenchao Xia, 2013/05/01
- [Qemu-devel] [PATCH V4 3/5] block: package committing code in qmp_transaction(), Wenchao Xia, 2013/05/01
- [Qemu-devel] [PATCH V4 4/5] block: package rollback code in qmp_transaction(), Wenchao Xia, 2013/05/01
- [Qemu-devel] [PATCH V4 5/5] block: make all steps in qmp_transaction() as callback, Wenchao Xia, 2013/05/01
- Re: [Qemu-devel] [PATCH V4 5/5] block: make all steps in qmp_transaction() as callback,
Eric Blake <=
- [Qemu-devel] [PATCH V4 2/5] block: move input parsing code in qmp_transaction(), Wenchao Xia, 2013/05/01
- Re: [Qemu-devel] [PATCH V4 0/5] block: make qmp_transaction extendable, Kevin Wolf, 2013/05/03
- Re: [Qemu-devel] [PATCH V4 0/5] block: make qmp_transaction extendable, Stefan Hajnoczi, 2013/05/03