On Wed, Apr 27, 2016 at 01:10:54PM +0200, Hannes Reinecke wrote:
> Similar to the existing 'show map $map topology', but allowing
> formatted content.
This touches on a patch I've thought about writing, but never got around
to. The issue is that with show_maps_topology() we call
update_multipath() to make sure we sync our state with the kernel before
returning it, but with show_maps(), we don't. Before we could change the
format, there was no point in updating the state in show_maps (and now,
in show_map). But now that we can get all that information, it might be
worth it.
On the other hand, update_multipath() might be more than we need.
update_multipath_strings() might be enought. And unlike when we first
wrote show_maps_topology(), we call update_multipath_strings() when we
check a path now.
I'm not sure what the best answer is, but I've considered adding (or
replacing update_multipath with) update_multipath_strings in all the map
showing functions, for consistency's sake.
but besides that thought, the patch looks fine.
-Ben
>
> Signed-off-by: Hannes Reinecke <h...@suse.de>
> ---
> multipathd/cli.c | 2 ++
> multipathd/cli_handlers.c | 67
> +++++++++++++++++++++++++++++++++++++++++++++++
> multipathd/cli_handlers.h | 2 ++
> multipathd/main.c | 2 ++
> 4 files changed, 73 insertions(+)
>
> diff --git a/multipathd/cli.c b/multipathd/cli.c
> index ab1365b..3c9cdbf 100644
> --- a/multipathd/cli.c
> +++ b/multipathd/cli.c
> @@ -497,6 +497,8 @@ cli_init (void) {
> add_handler(LIST+MAPS+TOPOLOGY, NULL);
> add_handler(LIST+TOPOLOGY, NULL);
> add_handler(LIST+MAP+TOPOLOGY, NULL);
> + add_handler(LIST+MAP+FMT, NULL);
> + add_handler(LIST+MAP+RAW+FMT, NULL);
> add_handler(LIST+CONFIG, NULL);
> add_handler(LIST+BLACKLIST, NULL);
> add_handler(LIST+DEVICES, NULL);
> diff --git a/multipathd/cli_handlers.c b/multipathd/cli_handlers.c
> index 886a5fd..dbdcbc2 100644
> --- a/multipathd/cli_handlers.c
> +++ b/multipathd/cli_handlers.c
> @@ -349,6 +349,33 @@ show_daemon (char ** r, int *len)
> }
>
> int
> +show_map (char ** r, int *len, struct multipath * mpp, char * style,
> + int pretty)
> +{
> + char * c;
> + char * reply;
> + unsigned int maxlen = INITIAL_REPLY_LEN;
> + int again = 1;
> +
> + reply = MALLOC(maxlen);
> + while (again) {
> + if (!reply)
> + return 1;
> +
> + c = reply;
> + c += snprint_multipath(c, reply + maxlen - c, style,
> + mpp, pretty);
> +
> + again = ((c - reply) == (maxlen - 1));
> +
> + REALLOC_REPLY(reply, again, maxlen);
> + }
> + *r = reply;
> + *len = (int)(c - reply + 1);
> + return 0;
> +}
> +
> +int
> show_maps (char ** r, int *len, struct vectors * vecs, char * style,
> int pretty)
> {
> @@ -407,6 +434,46 @@ cli_list_maps_raw (void * v, char ** reply, int * len,
> void * data)
> }
>
> int
> +cli_list_map_fmt (void * v, char ** reply, int * len, void * data)
> +{
> + struct multipath * mpp;
> + struct vectors * vecs = (struct vectors *)data;
> + char * param = get_keyparam(v, MAP);
> + char * fmt = get_keyparam(v, FMT);
> +
> + param = convert_dev(param, 0);
> + get_path_layout(vecs->pathvec, 0);
> + get_multipath_layout(vecs->mpvec, 1);
> + mpp = find_mp_by_str(vecs->mpvec, param);
> + if (!mpp)
> + return 1;
> +
> + condlog(3, "list map %s fmt %s (operator)", param, fmt);
> +
> + return show_map(reply, len, mpp, fmt, 1);
> +}
> +
> +int
> +cli_list_map_raw (void * v, char ** reply, int * len, void * data)
> +{
> + struct multipath * mpp;
> + struct vectors * vecs = (struct vectors *)data;
> + char * param = get_keyparam(v, MAP);
> + char * fmt = get_keyparam(v, FMT);
> +
> + param = convert_dev(param, 0);
> + get_path_layout(vecs->pathvec, 0);
> + get_multipath_layout(vecs->mpvec, 1);
> + mpp = find_mp_by_str(vecs->mpvec, param);
> + if (!mpp)
> + return 1;
> +
> + condlog(3, "list map %s fmt %s (operator)", param, fmt);
> +
> + return show_map(reply, len, mpp, fmt, 0);
> +}
> +
> +int
> cli_list_maps (void * v, char ** reply, int * len, void * data)
> {
> struct vectors * vecs = (struct vectors *)data;
> diff --git a/multipathd/cli_handlers.h b/multipathd/cli_handlers.h
> index 799f8da..5d51018 100644
> --- a/multipathd/cli_handlers.h
> +++ b/multipathd/cli_handlers.h
> @@ -7,6 +7,8 @@ int cli_list_daemon (void * v, char ** reply, int * len, void
> * data);
> int cli_list_maps (void * v, char ** reply, int * len, void * data);
> int cli_list_maps_fmt (void * v, char ** reply, int * len, void * data);
> int cli_list_maps_raw (void * v, char ** reply, int * len, void * data);
> +int cli_list_map_fmt (void * v, char ** reply, int * len, void * data);
> +int cli_list_map_raw (void * v, char ** reply, int * len, void * data);
> int cli_list_maps_status (void * v, char ** reply, int * len, void * data);
> int cli_list_maps_stats (void * v, char ** reply, int * len, void * data);
> int cli_list_map_topology (void * v, char ** reply, int * len, void * data);
> diff --git a/multipathd/main.c b/multipathd/main.c
> index d8fa88f..a58dae5 100644
> --- a/multipathd/main.c
> +++ b/multipathd/main.c
> @@ -990,6 +990,8 @@ uxlsnrloop (void * ap)
> set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
> set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
> set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
> + set_handler_callback(LIST+MAP+FMT, cli_list_map_fmt);
> + set_handler_callback(LIST+MAP+RAW+FMT, cli_list_map_fmt);
> set_handler_callback(LIST+CONFIG, cli_list_config);
> set_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
> set_handler_callback(LIST+DEVICES, cli_list_devices);
> --
> 2.6.6
--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel
