[sheepdog] [PATCH] sheep: disable journal by default

[Liu Yuan]

sent from my galaxy 2
在 2012-9-7 PM5:17，"MORITA Kazutaka" <morita.kazutaka at lab.ntt.co.jp>写道：
>
> It seems that most modern disk drives implement atomic sector writes
> (e.g. section 7.4 in http://www.sqlite.org/atomiccommit.html).  If it
> is true, we don't need to use journal for vdi object updates because
> we don't update them across a sector boundary.
>
> This patch uses atomic_put() for vdi creation, and doesn't use journal
> for vdi updates by default.

for partial update, we can use check command to repair consistency. So can
we completely remove journal？

>
> Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
> ---
>  sheep/ops.c        |    5 ++++-
>  sheep/sheep.c      |    7 ++++++-
>  sheep/sheep_priv.h |    2 ++
>  3 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/sheep/ops.c b/sheep/ops.c
> index 6aff0d5..4c0426f 100644
> --- a/sheep/ops.c
> +++ b/sheep/ops.c
> @@ -886,7 +886,10 @@ static int do_write_obj(struct siocb *iocb, struct
sd_req *hdr, uint32_t epoch,
>         iocb->buf = data;
>         iocb->length = hdr->data_length;
>         iocb->offset = hdr->obj.offset;
> -       if (is_vdi_obj(oid)) {
> +
> +       if (is_vdi_obj(oid) && create)
> +               ret = sd_store->atomic_put(oid, iocb);
> +       else if (is_vdi_obj(oid) && sys->use_journal) {
>                 struct strbuf buf = STRBUF_INIT;
>
>                 strbuf_addf(&buf, "%s%016" PRIx64, obj_path, oid);
> diff --git a/sheep/sheep.c b/sheep/sheep.c
> index b09443f..cdf447d 100644
> --- a/sheep/sheep.c
> +++ b/sheep/sheep.c
> @@ -43,6 +43,7 @@ static struct option const long_options[] = {
>         {"foreground", no_argument, NULL, 'f'},
>         {"gateway", no_argument, NULL, 'g'},
>         {"help", no_argument, NULL, 'h'},
> +       {"journal", no_argument, NULL, 'j'},
>         {"loglevel", required_argument, NULL, 'l'},
>         {"myaddr", required_argument, NULL, 'y'},
>         {"stdout", no_argument, NULL, 'o'},
> @@ -54,7 +55,7 @@ static struct option const long_options[] = {
>         {NULL, 0, NULL, 0},
>  };
>
> -static const char *short_options = "c:dDfghl:op:P:s:w:y:z:";
> +static const char *short_options = "c:dDfghjl:op:P:s:w:y:z:";
>
>  static void usage(int status)
>  {
> @@ -71,6 +72,7 @@ Options:\n\
>    -f, --foreground        make the program run in the foreground\n\
>    -g, --gateway           make the progam run as a gateway mode\n\
>    -h, --help              display this help and exit\n\
> +  -j, --journal           use jouranl to update vdi objects\n\
>    -l, --loglevel          specify the level of logging detail\n\
>    -o, --stdout            log to stdout instead of shared logger\n\
>    -p, --port              specify the TCP port on which to listen\n\
> @@ -409,6 +411,9 @@ int main(int argc, char **argv)
>                 case 'w':
>                         init_cache_type(optarg);
>                         break;
> +               case 'j':
> +                       sys->use_journal = true;
> +                       break;
>                 case 'h':
>                         usage(0);
>                         break;
> diff --git a/sheep/sheep_priv.h b/sheep/sheep_priv.h
> index b31328a..5cd9d3f 100644
> --- a/sheep/sheep_priv.h
> +++ b/sheep/sheep_priv.h
> @@ -122,6 +122,8 @@ struct cluster_info {
>
>         uint64_t object_cache_size;
>         bool object_cache_directio;
> +
> +       bool use_journal;
>  };
>
>  struct siocb {
> --
> 1.7.2.5
>
> --
> sheepdog mailing list
> sheepdog at lists.wpkg.org
> http://lists.wpkg.org/mailman/listinfo/sheepdog
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