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 <mwilck@xxxxxxxx>
---
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
--
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