On 05/07/2012 03:36 AM, MORITA Kazutaka wrote: > The gateway nodes only forwards requests to the sheepdog cluster, and > doesn't store objects in local at all. Running a gateway daemon on > localhost and connecting to it would be an alternative to implementing > sheepdog fail-over support in qemu because the gateway node > automatically choose the correct target nodes. > > Currently, this options is just an alias for '--vnodes 0'. Note that > a small storage to store epoch information is still required for > gateway nodes. > > Signed-off-by: MORITA Kazutaka <morita.kazutaka at gmail.com> > --- > sheep/sheep.c | 8 +++++++- > 1 files changed, 7 insertions(+), 1 deletions(-) > > diff --git a/sheep/sheep.c b/sheep/sheep.c > index 6645e8d..4e6e266 100644 > --- a/sheep/sheep.c > +++ b/sheep/sheep.c > @@ -40,6 +40,7 @@ static struct option const long_options[] = { > {"directio", no_argument, NULL, 'D'}, > {"foreground", no_argument, NULL, 'f'}, > {"nr_gateway_worker", required_argument, NULL, 'g'}, > + {"gateway", no_argument, NULL, 'G'}, > {"help", no_argument, NULL, 'h'}, > {"nr_io_worker", required_argument, NULL, 'i'}, > {"loglevel", required_argument, NULL, 'l'}, > @@ -50,7 +51,7 @@ static struct option const long_options[] = { > {NULL, 0, NULL, 0}, > }; > > -static const char *short_options = "ac:dDfg:hi:l:op:v:z:"; > +static const char *short_options = "ac:dDfg:Ghi:l:op:v:z:"; > > static void usage(int status) > { > @@ -68,6 +69,7 @@ Options:\n\ > -D, --directio use direct IO when accessing the object from object cache\n\ > -f, --foreground make the program run in the foreground\n\ > -g, --nr_gateway_worker set the number of workers for Guests' requests (default 4)\n\ > + -G, --gateway make the progam run as a gateway mode (same as '-v 0')\n\ > -h, --help display this help and exit\n\ > -i, --nr_io_worker set the number of workers for sheep internal requests (default 4)\n\ > -l, --loglevel specify the level of logging detail\n\ > @@ -156,6 +158,10 @@ int main(int argc, char **argv) > exit(1); > } > break; > + case 'G': > + /* same as '-v 0' */ > + nr_vnodes = 0; > + break; > case 'i': > nr_io_worker = strtol(optarg, &p, 10); > if (optarg == p || nr_io_worker < 4 || nr_io_worker > UINT32_MAX) { What if a user both set -G and -v? Do we need to handle this corner erroneous case? Thanks, Yuan |