This flag can used to avoid any IO on the device itself. Useful for getting the path state without the risk of hanging or running into IO errors.
Signed-off-by: Martin Wilck <[email protected]> --- libmultipath/discovery.c | 8 ++++++++ libmultipath/discovery.h | 2 ++ 2 files changed, 10 insertions(+) diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c index 3a912d76..0ff2faa7 100644 --- a/libmultipath/discovery.c +++ b/libmultipath/discovery.c @@ -1926,6 +1926,14 @@ int pathinfo(struct path *pp, struct config *conf, int mask) path_state = path_offline(pp); if (path_state == PATH_REMOVED) goto blank; + else if (mask & DI_NOIO) { + /* + * Avoid any IO on the device itself. + * Behave like DI_CHECKER in the "path unavailable" case. + */ + pp->chkrstate = pp->state = path_state; + return PATHINFO_OK; + } /* * fetch info not available through sysfs diff --git a/libmultipath/discovery.h b/libmultipath/discovery.h index 51c23d6f..65352881 100644 --- a/libmultipath/discovery.h +++ b/libmultipath/discovery.h @@ -62,6 +62,7 @@ enum discovery_mode { __DI_PRIO, __DI_WWID, __DI_BLACKLIST, + __DI_NOIO, }; #define DI_SYSFS (1 << __DI_SYSFS) @@ -70,6 +71,7 @@ enum discovery_mode { #define DI_PRIO (1 << __DI_PRIO) #define DI_WWID (1 << __DI_WWID) #define DI_BLACKLIST (1 << __DI_BLACKLIST) +#define DI_NOIO (1 << __DI_NOIO) /* Avoid IO on the device */ #define DI_ALL (DI_SYSFS | DI_SERIAL | DI_CHECKER | DI_PRIO | \ DI_WWID) -- 2.14.0 -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
