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Re: [Qemu-devel] [RFC V6 07/11] quorum: Add quorum mechanism.
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [RFC V6 07/11] quorum: Add quorum mechanism. |
Date: |
Thu, 17 Jan 2013 15:23:29 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 |
On 01/17/2013 08:51 AM, Benoît Canet wrote:
> Signed-off-by: Benoit Canet <address@hidden>
> ---
> block/quorum.c | 278
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 277 insertions(+), 1 deletion(-)
>
> diff --git a/block/quorum.c b/block/quorum.c
> index 98052eb..2bffff4 100644
> --- a/block/quorum.c
> +++ b/block/quorum.c
> @@ -14,6 +14,20 @@
> */
>
> #include "block/block_int.h"
> +#include "zlib.h"
Since zlib.h isn't part of qemu.git, this should be <zlib.h>.
> +
> +static unsigned long quorum_compute_checksum(QuorumAIOCB *acb, int i)
> +{
> + int j;
> + unsigned long adler = adler32(0L, Z_NULL, 0);
Hmm, adler32() is basically a weak hashing mechanism; are you sure you
won't have any false collisions? Furthermore, how does this compare
with the series for adding deduplication, which uses much
stronger/longer hashes, but where those take more time to compute? Is
there any way you can share efforts between the two series?
> + /* get the index of the first successfull read */
s/successfull/successful/ (several times in this patch)
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] [RFC V6 00/11] Quorum block filter., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 03/11] quorum: Add quorum_open() and quorum_close()., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 04/11] quorum: Add quorum_aio_writev and its dependencies., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 06/11] quorum: Add quorum_aio_readv., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 05/11] blkverify: Extract qemu_iovec_clone() and qemu_iovec_compare() from blkverify., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 09/11] quorum: Add quorum_invalidate_cache()., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 10/11] quorum: Add quorum_co_is_allocated., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 08/11] quorum: Add quorum_getlength()., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 07/11] quorum: Add quorum mechanism., Benoît Canet, 2013/01/17
- Re: [Qemu-devel] [RFC V6 07/11] quorum: Add quorum mechanism.,
Eric Blake <=
- [Qemu-devel] [RFC V6 11/11] quorum: Add quorum_co_flush()., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 02/11] quorum: Create BDRVQuorumState and BlkDriver and do init., Benoît Canet, 2013/01/17
- [Qemu-devel] [RFC V6 01/11] quorum: Create quorum .c, add QuorumSingleAIOCB and QuorumAIOCB., Benoît Canet, 2013/01/17