Add functionality to ztest to change dnodesize

This change adds a new test to the ztest test suite, for changing a
dataset's dnodesize to a randomly chosen valid value.

Signed-off-by: Prakash Surya <surya1@llnl.gov>

cmd/ztest/ztest.c

@@ -322,6 +322,7 @@ ztest_func_t ztest_dmu_prealloc;
 ztest_func_t ztest_fzap;
 ztest_func_t ztest_dmu_snapshot_create_destroy;
 ztest_func_t ztest_dsl_prop_get_set;
+ztest_func_t ztest_dsl_dnodesize_get_set;
 ztest_func_t ztest_spa_prop_get_set;
 ztest_func_t ztest_spa_create_destroy;
 ztest_func_t ztest_fault_inject;
@@ -363,6 +364,7 @@ ztest_info_t ztest_info[] = {
 	ZTI_INIT(ztest_dmu_read_write_zcopy, 1, &zopt_often),
 	ZTI_INIT(ztest_dmu_objset_create_destroy, 1, &zopt_often),
 	ZTI_INIT(ztest_dsl_prop_get_set, 1, &zopt_often),
+	ZTI_INIT(ztest_dsl_dnodesize_get_set, 1, &zopt_always),
 	ZTI_INIT(ztest_spa_prop_get_set, 1, &zopt_sometimes),
 #if 0
 	ZTI_INIT(ztest_dmu_prealloc, 1, &zopt_sometimes),
@@ -1368,7 +1370,7 @@ ztest_bt_bonus(dmu_buf_t *db)
 #define	lrz_blocksize	lr_uid
 #define	lrz_ibshift	lr_gid
 #define	lrz_bonustype	lr_rdev
-#define	lrz_bonuslen	lr_crtime[1]
+#define	lrz_count	lr_crtime[1]
 
 static void
 ztest_log_create(ztest_ds_t *zd, dmu_tx_t *tx, lr_create_t *lr)
@@ -1510,21 +1512,21 @@ ztest_replay_create(ztest_ds_t *zd, lr_create_t *lr, boolean_t byteswap)
 		if (lr->lr_foid == 0) {
 			lr->lr_foid = zap_create(os,
 			    lr->lrz_type, lr->lrz_bonustype,
-			    lr->lrz_bonuslen, tx);
+			    DN_BONUS_SIZE(lr->lrz_count), tx);
 		} else {
 			error = zap_create_claim(os, lr->lr_foid,
 			    lr->lrz_type, lr->lrz_bonustype,
-			    lr->lrz_bonuslen, tx);
+			    DN_BONUS_SIZE(lr->lrz_count), tx);
 		}
 	} else {
 		if (lr->lr_foid == 0) {
 			lr->lr_foid = dmu_object_alloc(os,
 			    lr->lrz_type, 0, lr->lrz_bonustype,
-			    lr->lrz_bonuslen, tx);
+			    DN_BONUS_SIZE(lr->lrz_count), tx);
 		} else {
 			error = dmu_object_claim(os, lr->lr_foid,
 			    lr->lrz_type, 0, lr->lrz_bonustype,
-			    lr->lrz_bonuslen, tx);
+			    DN_BONUS_SIZE(lr->lrz_count), tx);
 		}
 	}
 
@@ -2065,7 +2067,7 @@ ztest_create(ztest_ds_t *zd, ztest_od_t *od, int count)
 		lr->lrz_blocksize = od->od_crblocksize;
 		lr->lrz_ibshift = ztest_random_ibshift();
 		lr->lrz_bonustype = DMU_OT_UINT64_OTHER;
-		lr->lrz_bonuslen = dmu_bonus_max();
+		lr->lrz_count = zd->zd_os->os_dn_count;
 		lr->lr_gen = od->od_crgen;
 		lr->lr_crtime[0] = time(NULL);
 
@@ -3629,6 +3631,8 @@ ztest_dmu_object_alloc_free(ztest_ds_t *zd, uint64_t id)
 	int size;
 	int b;
 
+	ztest_dsl_dnodesize_get_set(zd, id);
+
 	size = sizeof (ztest_od_t) * OD_ARRAY_SIZE;
 	od = umem_alloc(size, UMEM_NOFAIL);
 	batchsize = OD_ARRAY_SIZE;
@@ -4764,6 +4768,42 @@ ztest_dmu_commit_callbacks(ztest_ds_t *zd, uint64_t id)
 	umem_free(od, sizeof (ztest_od_t));
 }
 
+/* ARGSUSED */
+void
+ztest_dsl_dnodesize_get_set(ztest_ds_t *zd, uint64_t id)
+{
+	const char *propname = zfs_prop_to_name(ZFS_PROP_DNODESIZE);
+	char *setpoint;
+	uint64_t rand, size, curval;
+	int error;
+
+	rand = ztest_random(DNODE_MAX_SIZE - DNODE_MIN_SIZE);
+	size = (DNODE_MIN_SIZE + rand) - (rand % DNODE_MIN_SIZE);
+
+	ASSERT3S(size, >=, DNODE_MIN_SIZE);
+	ASSERT3S(size, <=, DNODE_MAX_SIZE);
+	ASSERT0(size % DNODE_MIN_SIZE);
+
+	error = dsl_prop_set_int(zd->zd_name, propname,
+	    (ztest_random(2) ? ZPROP_SRC_NONE : ZPROP_SRC_LOCAL), size);
+
+	if (error == ENOSPC) {
+		ztest_record_enospc(FTAG);
+		return;
+	} else {
+		ASSERT0(error);
+	}
+
+	setpoint = umem_alloc(MAXPATHLEN, UMEM_NOFAIL);
+	VERIFY0(dsl_prop_get_integer(zd->zd_name, propname, &curval, setpoint));
+
+	if (ztest_opts.zo_verbose >= 6)
+		(void) printf("%s %s = %lu at '%s'\n",
+		    zd->zd_name, propname, curval, setpoint);
+
+	umem_free(setpoint, MAXPATHLEN);
+}
+
 /* ARGSUSED */
 void
 ztest_dsl_prop_get_set(ztest_ds_t *zd, uint64_t id)