Enable compiler to typecheck logging

Annotate spa logging declarations with printflike
Workaround gcc bug (non disable-able warning) by
replacing "" with " "

Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #9316

include/os/linux/spl/sys/debug.h

@@ -50,6 +50,8 @@
 /*
  * Common DEBUG functionality.
  */
+#define	__printflike(a, b)	__printf(a, b)
+
 int spl_panic(const char *file, const char *func, int line,
     const char *fmt, ...);
 void spl_dumpstack(void);

include/sys/spa.h

@@ -1153,11 +1153,11 @@ extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl);
 extern void spa_history_log_version(spa_t *spa, const char *operation,
     dmu_tx_t *tx);
 extern void spa_history_log_internal(spa_t *spa, const char *operation,
-    dmu_tx_t *tx, const char *fmt, ...);
+    dmu_tx_t *tx, const char *fmt, ...) __printflike(4, 5);
 extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
-    dmu_tx_t *tx, const char *fmt, ...);
+    dmu_tx_t *tx, const char *fmt, ...)  __printflike(4, 5);
 extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
-    dmu_tx_t *tx, const char *fmt, ...);
+    dmu_tx_t *tx, const char *fmt, ...) __printflike(4, 5);
 
 extern const char *spa_state_to_name(spa_t *spa);
 

lib/libspl/include/sys/debug.h

@@ -29,4 +29,8 @@
 
 #include <assert.h>
 
+#ifndef	__printflike
+#define	__printflike(x, y) __attribute__((__format__(__printf__, x, y)))
+#endif
+
 #endif

module/zfs/dmu_objset.c

@@ -1375,7 +1375,7 @@ dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
 	VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
 	dsl_dataset_name(origin, namebuf);
 	spa_history_log_internal_ds(ds, "clone", tx,
-	    "origin=%s (%llu)", namebuf, origin->ds_object);
+	    "origin=%s (%llu)", namebuf, (u_longlong_t)origin->ds_object);
 	zvol_create_minors(dp->dp_spa, doca->doca_clone, B_TRUE);
 	dsl_dataset_rele(ds, FTAG);
 	dsl_dataset_rele(origin, FTAG);

module/zfs/dsl_scan.c

@@ -759,7 +759,8 @@ dsl_scan_setup_sync(void *arg, dmu_tx_t *tx)
 
 	spa_history_log_internal(spa, "scan setup", tx,
 	    "func=%u mintxg=%llu maxtxg=%llu",
-	    *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg);
+	    *funcp, (u_longlong_t)scn->scn_phys.scn_min_txg,
+	    (u_longlong_t)scn->scn_phys.scn_max_txg);
 }
 
 /*
@@ -900,13 +901,13 @@ dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx)
 
 	if (dsl_scan_restarting(scn, tx))
 		spa_history_log_internal(spa, "scan aborted, restarting", tx,
-		    "errors=%llu", spa_get_errlog_size(spa));
+		    "errors=%llu", (u_longlong_t)spa_get_errlog_size(spa));
 	else if (!complete)
 		spa_history_log_internal(spa, "scan cancelled", tx,
-		    "errors=%llu", spa_get_errlog_size(spa));
+		    "errors=%llu", (u_longlong_t)spa_get_errlog_size(spa));
 	else
 		spa_history_log_internal(spa, "scan done", tx,
-		    "errors=%llu", spa_get_errlog_size(spa));
+		    "errors=%llu", (u_longlong_t)spa_get_errlog_size(spa));
 
 	if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
 		spa->spa_scrub_started = B_FALSE;
@@ -957,7 +958,8 @@ dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx)
 		if (resilver_needed) {
 			spa_history_log_internal(spa,
 			    "starting deferred resilver", tx,
-			    "errors=%llu", spa_get_errlog_size(spa));
+			    "errors=%llu",
+			    (u_longlong_t)spa_get_errlog_size(spa));
 			spa_async_request(spa, SPA_ASYNC_RESILVER);
 		}
 	}

module/zfs/dsl_userhold.c

@@ -197,7 +197,7 @@ dsl_dataset_user_hold_sync_one_impl(nvlist_t *tmpholds, dsl_dataset_t *ds,
 
 	spa_history_log_internal_ds(ds, "hold", tx,
 	    "tag=%s temp=%d refs=%llu",
-	    htag, minor != 0, ds->ds_userrefs);
+	    htag, minor != 0, (u_longlong_t)ds->ds_userrefs);
 }
 
 typedef struct zfs_hold_cleanup_arg {

module/zfs/spa.c

@@ -887,7 +887,7 @@ spa_change_guid_sync(void *arg, dmu_tx_t *tx)
 	spa_config_exit(spa, SCL_STATE, FTAG);
 
 	spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu",
-	    oldguid, *newguid);
+	    (u_longlong_t)oldguid, (u_longlong_t)*newguid);
 }
 
 /*
@@ -7898,7 +7898,8 @@ spa_async_thread(void *arg)
 		if (new_space != old_space) {
 			spa_history_log_internal(spa, "vdev online", NULL,
 			    "pool '%s' size: %llu(+%llu)",
-			    spa_name(spa), new_space, new_space - old_space);
+			    spa_name(spa), (u_longlong_t)new_space,
+			    (u_longlong_t)(new_space - old_space));
 		}
 	}
 
@@ -8388,7 +8389,8 @@ spa_sync_version(void *arg, dmu_tx_t *tx)
 
 	spa->spa_uberblock.ub_version = version;
 	vdev_config_dirty(spa->spa_root_vdev);
-	spa_history_log_internal(spa, "set", tx, "version=%lld", version);
+	spa_history_log_internal(spa, "set", tx, "version=%lld",
+	    (longlong_t)version);
 }
 
 /*
@@ -8502,7 +8504,8 @@ spa_sync_props(void *arg, dmu_tx_t *tx)
 				    spa->spa_pool_props_object, propname,
 				    8, 1, &intval, tx));
 				spa_history_log_internal(spa, "set", tx,
-				    "%s=%lld", nvpair_name(elem), intval);
+				    "%s=%lld", nvpair_name(elem),
+				    (longlong_t)intval);
 			} else {
 				ASSERT(0); /* not allowed */
 			}

module/zfs/spa_checkpoint.c

@@ -524,7 +524,7 @@ spa_checkpoint_sync(void *arg, dmu_tx_t *tx)
 	spa_feature_incr(spa, SPA_FEATURE_POOL_CHECKPOINT, tx);
 
 	spa_history_log_internal(spa, "spa checkpoint", tx,
-	    "checkpointed uberblock txg=%llu", checkpoint.ub_txg);
+	    "checkpointed uberblock txg=%llu", (u_longlong_t)checkpoint.ub_txg);
 }
 
 /*

module/zfs/vdev_removal.c

@@ -347,7 +347,7 @@ vdev_remove_initiate_sync(void *arg, dmu_tx_t *tx)
 	    vic->vic_mapping_object);
 
 	spa_history_log_internal(spa, "vdev remove started", tx,
-	    "%s vdev %llu %s", spa_name(spa), vd->vdev_id,
+	    "%s vdev %llu %s", spa_name(spa), (u_longlong_t)vd->vdev_id,
 	    (vd->vdev_path != NULL) ? vd->vdev_path : "-");
 	/*
 	 * Setting spa_vdev_removal causes subsequent frees to call
@@ -1111,7 +1111,7 @@ vdev_remove_complete_sync(void *arg, dmu_tx_t *tx)
 	spa_finish_removal(dmu_tx_pool(tx)->dp_spa, DSS_FINISHED, tx);
 	/* vd->vdev_path is not available here */
 	spa_history_log_internal(spa, "vdev remove completed",  tx,
-	    "%s vdev %llu", spa_name(spa), vd->vdev_id);
+	    "%s vdev %llu", spa_name(spa), (u_longlong_t)vd->vdev_id);
 }
 
 static void
@@ -1757,7 +1757,8 @@ spa_vdev_remove_cancel_sync(void *arg, dmu_tx_t *tx)
 	    vd->vdev_id, dmu_tx_get_txg(tx));
 	spa_history_log_internal(spa, "vdev remove canceled", tx,
 	    "%s vdev %llu %s", spa_name(spa),
-	    vd->vdev_id, (vd->vdev_path != NULL) ? vd->vdev_path : "-");
+	    (u_longlong_t)vd->vdev_id,
+	    (vd->vdev_path != NULL) ? vd->vdev_path : "-");
 }
 
 static int