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Re: [Qemu-devel] [PATCH 1/4] qcow2: Clean-up update_cluster_refcount().
From: |
Laurent Vivier |
Subject: |
Re: [Qemu-devel] [PATCH 1/4] qcow2: Clean-up update_cluster_refcount(). |
Date: |
Fri, 07 Nov 2008 09:48:35 +0100 |
Le jeudi 06 novembre 2008 à 18:32 +0100, Kevin Wolf a écrit :
> Laurent Vivier schrieb:
> > pièce jointe document texte brut
> > (0001-Clean-up-update_cluster_refcount.patch)
> > Move some parts to alloc_refcount_block() and block cache
> > checking to load_refcount_block().
> >
> > Signed-off-by: Laurent Vivier <address@hidden>
> > ---
> > block-qcow2.c | 71
> > +++++++++++++++++++++++++++++++++++-----------------------
> > 1 file changed, 43 insertions(+), 28 deletions(-)
> >
> > Index: qemu/block-qcow2.c
> > ===================================================================
> > --- qemu.orig/block-qcow2.c 2008-11-06 16:34:46.000000000 +0100
> > +++ qemu/block-qcow2.c 2008-11-06 16:40:27.000000000 +0100
> > @@ -2169,6 +2169,10 @@ static int load_refcount_block(BlockDriv
> > {
> > BDRVQcowState *s = bs->opaque;
> > int ret;
> > +
> > + if (refcount_block_offset == s->refcount_block_cache_offset)
> > + return 0;
> > +
> > ret = bdrv_pread(s->hd, refcount_block_offset, s->refcount_block_cache,
> > s->cluster_size);
> > if (ret != s->cluster_size)
> > @@ -2189,11 +2193,8 @@ static int get_refcount(BlockDriverState
> > refcount_block_offset = s->refcount_table[refcount_table_index];
> > if (!refcount_block_offset)
> > return 0;
> > - if (refcount_block_offset != s->refcount_block_cache_offset) {
> > - /* better than nothing: return allocated if read error */
> > - if (load_refcount_block(bs, refcount_block_offset) < 0)
> > - return 1;
> > - }
> > + if (load_refcount_block(bs, refcount_block_offset) < 0)
> > + return 1;
>
> Please retain the comment saying that 1 is not the correct value but we
> default to allocated for safety if the block could not be read. I don't
> think this is obvious.
I totally agree with you, but it's just a code move, I don't want to
change anything except the line numbers.
I think this kind of change must have its own patch.
Regards,
Laurent
--
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