Upstream: Add snapshot events

For kernel to send snapshot mount/unmount events to zed.

Signed-off-by: Jorgen Lundman <lundman@lundman.net>

include/sys/fm/fs/zfs.h

@@ -55,6 +55,8 @@ extern "C" {
 #define	FM_EREPORT_ZFS_PROBE_FAILURE		"probe_failure"
 #define	FM_EREPORT_ZFS_LOG_REPLAY		"log_replay"
 #define	FM_EREPORT_ZFS_CONFIG_CACHE_WRITE	"config_cache_write"
+#define	FM_EREPORT_ZFS_SNAPSHOT_MOUNT	"snapshot_mount"
+#define	FM_EREPORT_ZFS_SNAPSHOT_UNMOUNT	"snapshot_unmount"
 
 #define	FM_EREPORT_PAYLOAD_ZFS_POOL		"pool"
 #define	FM_EREPORT_PAYLOAD_ZFS_POOL_FAILMODE	"pool_failmode"

module/zfs/zfs_fm.c

@@ -1443,7 +1443,29 @@ zfs_ereport_fini(void)
 	list_destroy(&recent_events_list);
 	mutex_destroy(&recent_events_lock);
 }
+#endif
+
+void
+zfs_ereport_snapshot_post(const char *subclass, spa_t *spa, const char *name)
+{
+#ifdef _KERNEL
+	nvlist_t *ereport = NULL;
+	nvlist_t *detector = NULL;
+
+	zfs_ereport_start(&ereport, &detector,
+	    subclass,
+	    spa, NULL, NULL, NULL, 0, 0);
+
+	if (ereport == NULL) return;
+
+	VERIFY0(nvlist_add_string(ereport, "snapshot_name", name));
+
+	/* Cleanup is handled by the callback function */
+	zfs_zevent_post(ereport, detector, zfs_zevent_post_cb);
+#endif
+}
 
+#if defined(_KERNEL)
 EXPORT_SYMBOL(zfs_ereport_post);
 EXPORT_SYMBOL(zfs_ereport_is_valid);
 EXPORT_SYMBOL(zfs_ereport_post_checksum);