Add illumos FMD ZFS logic to ZED -- phase 2

The phase 2 work primarily entails the Diagnosis Engine and
the Retire Agent modules. It also includes infrastructure
to support a crude FMD environment to host these modules.

The Diagnosis Engine consumes I/O and checksum ereports and
feeds them into a SERD engine which will generate a corres-
ponding fault diagnosis when the SERD engine fires. All the
diagnosis state data is collected into cases, one case per
vdev being tracked.

The Retire Agent responds to diagnosed faults by isolating
the faulty VDEV. It will notify the ZFS kernel module of
the new VDEV state (degraded or faulted). This agent is
also responsible for managing hot spares across pools.
When it encounters a device fault or a device removal it
replaces the device with an appropriate spare if available.

Reviewed-by: Tony Hutter <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Don Brady <[email protected]>
Closes #5343 

1 files changed, 10 insertions, 5 deletions

diff --git a/cmd/zed/zed_disk_event.c b/cmd/zed/zed_disk_event.c
index b5f57508e..10f24c996 100644
--- a/cmd/zed/zed_disk_event.c
+++ b/cmd/zed/zed_disk_event.c
@@ -80,7 +80,7 @@ zed_udev_event(const char *class, const char *subclass, nvlist_t *nvl)
 	if (nvlist_lookup_uint64(nvl, ZFS_EV_VDEV_GUID, &numval) == 0)
 		zed_log_msg(LOG_INFO, "\t%s: %llu", ZFS_EV_VDEV_GUID, numval);
 
-	(void) zfs_slm_event(class, subclass, nvl);
+	(void) zfs_agent_post_event(class, subclass, nvl);
 }
 
 /*
@@ -213,8 +213,6 @@ zed_udev_monitor(void *arg)
 		    strcmp(type, "disk") == 0 &&
 		    part != NULL && part[0] != '\0') {
 			/* skip and wait for partition event */
-			zed_log_msg(LOG_INFO, "zed_udev_monitor: %s waiting "
-			    "for slice", udev_device_get_devnode(dev));
 			udev_device_unref(dev);
 			continue;
 		}
@@ -297,12 +295,19 @@ zed_udev_monitor(void *arg)
 				 * dev are the same name (i.e. /dev/dm-5), then
 				 * there is no real underlying disk for this
 				 * multipath device, and so this "change" event
-				 * really a multipath removal.
+				 * really is a multipath removal.
 				 */
 				class = EC_DEV_ADD;
 				subclass = ESC_DISK;
 			} else {
-				/* multipath remove, ignore it. */
+				tmp = (char *)
+				    udev_device_get_property_value(dev,
+				    "DM_NR_VALID_PATHS");
+				/* treat as a multipath remove */
+				if (tmp != NULL && strcmp(tmp, "0") == 0) {
+					class = EC_DEV_REMOVE;
+					subclass = ESC_DISK;
+				}
 			}
 			free(tmp2);
 		}