On Fri, Feb 26, 2016 at 02:25:08AM +0000, Shiva Krishna wrote:
> ---
> libmultipath/propsel.c | 2 +-
> libmultipath/structs.h | 1 +
> multipathd/main.c | 19 ++++++++++++++++---
> 3 files changed, 18 insertions(+), 4 deletions(-)
>
> diff --git a/libmultipath/propsel.c b/libmultipath/propsel.c
> index f64d5e4..b9e389f 100644
> --- a/libmultipath/propsel.c
> +++ b/libmultipath/propsel.c
> @@ -374,7 +374,7 @@ detect_prio(struct path * pp)
> int ret;
> struct prio *p = &pp->prio;
>
> - if (get_target_port_group_support(pp->fd) <= 0)
> + if ((pp->tpgs = get_target_port_group_support(pp->fd)) <= 0)
> return;
> ret = get_target_port_group(pp->fd);
> if (ret < 0)
Again, setting this in detect_prio will make this useless for all
devices that don't use detect_prio. After the "out:" label in
select_prio, you can check if the alua prioritizer is being used,
and set this there.
-Ben
> diff --git a/libmultipath/structs.h b/libmultipath/structs.h
> index 5f68a8e..ef5fb7e 100644
> --- a/libmultipath/structs.h
> +++ b/libmultipath/structs.h
> @@ -193,6 +193,7 @@ struct path {
> int detect_prio;
> int watch_checks;
> int wait_checks;
> + int tpgs;
> char * uid_attribute;
> char * getuid;
> struct prio prio;
> diff --git a/multipathd/main.c b/multipathd/main.c
> index 04f6d02..b6b0053 100644
> --- a/multipathd/main.c
> +++ b/multipathd/main.c
> @@ -62,6 +62,7 @@ static int use_watchdog;
> #include <pgpolicies.h>
> #include <uevent.h>
> #include <log.h>
> +#include "prioritizers/alua_rtpg.h"
>
> #include "main.h"
> #include "pidfile.h"
> @@ -1161,6 +1162,7 @@ check_path (struct vectors * vecs, struct path * pp)
> int new_path_up = 0;
> int chkr_new_path_up = 0;
> int add_active;
> + int ignore_reinstate = 0;
> int oldchkrstate = pp->chkrstate;
>
> if (pp->initialized && !pp->mpp)
> @@ -1235,6 +1237,16 @@ check_path (struct vectors * vecs, struct path * pp)
> pp->wait_checks = 0;
> }
>
> + /*
> + * don't reinstate failed path, if its in stand-by
> + * and if target supports only implicit tpgs mode.
> + * this will prevent unnecessary i/o by dm on stand-by
> + * paths if there are no other active paths in map.
> + */
> + ignore_reinstate = (newstate == PATH_GHOST &&
> + pp->mpp->nr_active == 0 &&
> + pp->tpgs == TPGS_IMPLICIT) ? 1 : 0;
> +
> pp->chkrstate = newstate;
> if (newstate != pp->state) {
> int oldstate = pp->state;
> @@ -1297,7 +1309,7 @@ check_path (struct vectors * vecs, struct path * pp)
> pp->watch_checks--;
> add_active = 0;
> }
> - if (reinstate_path(pp, add_active)) {
> + if (!ignore_reinstate && reinstate_path(pp, add_active)) {
> condlog(3, "%s: reload map", pp->dev);
> ev_add_path(pp, vecs);
> pp->tick = 1;
> @@ -1316,8 +1328,9 @@ check_path (struct vectors * vecs, struct path * pp)
> enable_group(pp);
> }
> else if (newstate == PATH_UP || newstate == PATH_GHOST) {
> - if (pp->dmstate == PSTATE_FAILED ||
> - pp->dmstate == PSTATE_UNDEF) {
> + if ((pp->dmstate == PSTATE_FAILED ||
> + pp->dmstate == PSTATE_UNDEF) &&
> + !ignore_reinstate) {
> /* Clear IO errors */
> if (reinstate_path(pp, 0)) {
> condlog(3, "%s: reload map", pp->dev);
> --
>
--
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