1 files changed, 78 insertions, 56 deletions

diff --git a/sys/contrib/openzfs/cmd/zhack.c b/sys/contrib/openzfs/cmd/zhack.c
index edf9dfa2cece..8ffbf91ffb30 100644
--- a/sys/contrib/openzfs/cmd/zhack.c
+++ b/sys/contrib/openzfs/cmd/zhack.c
@@ -714,6 +714,23 @@ zhack_repair_read_label(const int fd, vdev_label_t *vl,
 	return (0);
 }
 
+static int
+zhack_repair_get_byteswap(const zio_eck_t *vdev_eck, const int l, int *byteswap)
+{
+	if (vdev_eck->zec_magic == ZEC_MAGIC) {
+		*byteswap = B_FALSE;
+	} else if (vdev_eck->zec_magic == BSWAP_64((uint64_t)ZEC_MAGIC)) {
+		*byteswap = B_TRUE;
+	} else {
+		(void) fprintf(stderr, "error: label %d: "
+		    "Expected the nvlist checksum magic number but instead got "
+		    "0x%" PRIx64 "\n",
+		    l, vdev_eck->zec_magic);
+		return (1);
+	}
+	return (0);
+}
+
 static void
 zhack_repair_calc_cksum(const int byteswap, void *data, const uint64_t offset,
     const uint64_t abdsize, zio_eck_t *eck, zio_cksum_t *cksum)
@@ -740,33 +757,10 @@ zhack_repair_calc_cksum(const int byteswap, void *data, const uint64_t offset,
 }
 
 static int
-zhack_repair_check_label(uberblock_t *ub, const int l, const char **cfg_keys,
-    const size_t cfg_keys_len, nvlist_t *cfg, nvlist_t *vdev_tree_cfg,
-    uint64_t *ashift)
+zhack_repair_get_ashift(nvlist_t *cfg, const int l, uint64_t *ashift)
 {
 	int err;
-
-	if (ub->ub_txg != 0) {
-		(void) fprintf(stderr,
-		    "error: label %d: UB TXG of 0 expected, but got %"
-		    PRIu64 "\n",
-		    l, ub->ub_txg);
-		(void) fprintf(stderr, "It would appear the device was not "
-		    "properly removed.\n");
-		return (1);
-	}
-
-	for (int i = 0; i < cfg_keys_len; i++) {
-		uint64_t val;
-		err = nvlist_lookup_uint64(cfg, cfg_keys[i], &val);
-		if (err) {
-			(void) fprintf(stderr,
-			    "error: label %d, %d: "
-			    "cannot find nvlist key %s\n",
-			    l, i, cfg_keys[i]);
-			return (err);
-		}
-	}
+	nvlist_t *vdev_tree_cfg;
 
 	err = nvlist_lookup_nvlist(cfg,
 	    ZPOOL_CONFIG_VDEV_TREE, &vdev_tree_cfg);
@@ -790,7 +784,7 @@ zhack_repair_check_label(uberblock_t *ub, const int l, const char **cfg_keys,
 		(void) fprintf(stderr,
 		    "error: label %d: nvlist key %s is zero\n",
 		    l, ZPOOL_CONFIG_ASHIFT);
-		return (err);
+		return (1);
 	}
 
 	return (0);
@@ -805,30 +799,35 @@ zhack_repair_undetach(uberblock_t *ub, nvlist_t *cfg, const int l)
 	 */
 	if (BP_GET_LOGICAL_BIRTH(&ub->ub_rootbp) != 0) {
 		const uint64_t txg = BP_GET_LOGICAL_BIRTH(&ub->ub_rootbp);
+		int err;
+
 		ub->ub_txg = txg;
 
-		if (nvlist_remove_all(cfg, ZPOOL_CONFIG_CREATE_TXG) != 0) {
+		err = nvlist_remove_all(cfg, ZPOOL_CONFIG_CREATE_TXG);
+		if (err) {
 			(void) fprintf(stderr,
 			    "error: label %d: "
 			    "Failed to remove pool creation TXG\n",
 			    l);
-			return (1);
+			return (err);
 		}
 
-		if (nvlist_remove_all(cfg, ZPOOL_CONFIG_POOL_TXG) != 0) {
+		err = nvlist_remove_all(cfg, ZPOOL_CONFIG_POOL_TXG);
+		if (err) {
 			(void) fprintf(stderr,
 			    "error: label %d: Failed to remove pool TXG to "
 			    "be replaced.\n",
 			    l);
-			return (1);
+			return (err);
 		}
 
-		if (nvlist_add_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, txg) != 0) {
+		err = nvlist_add_uint64(cfg, ZPOOL_CONFIG_POOL_TXG, txg);
+		if (err) {
 			(void) fprintf(stderr,
 			    "error: label %d: "
 			    "Failed to add pool TXG of %" PRIu64 "\n",
 			    l, txg);
-			return (1);
+			return (err);
 		}
 	}
 
@@ -922,6 +921,7 @@ zhack_repair_test_cksum(const int byteswap, void *vdev_data,
 	    BSWAP_64(ZEC_MAGIC) : ZEC_MAGIC;
 	const uint64_t actual_magic = vdev_eck->zec_magic;
 	int err = 0;
+
 	if (actual_magic != expected_magic) {
 		(void) fprintf(stderr, "error: label %d: "
 		    "Expected "
@@ -943,6 +943,36 @@ zhack_repair_test_cksum(const int byteswap, void *vdev_data,
 	return (err);
 }
 
+static int
+zhack_repair_unpack_cfg(vdev_label_t *vl, const int l, nvlist_t **cfg)
+{
+	const char *cfg_keys[] = { ZPOOL_CONFIG_VERSION,
+	    ZPOOL_CONFIG_POOL_STATE, ZPOOL_CONFIG_GUID };
+	int err;
+
+	err = nvlist_unpack(vl->vl_vdev_phys.vp_nvlist,
+	    VDEV_PHYS_SIZE - sizeof (zio_eck_t), cfg, 0);
+	if (err) {
+		(void) fprintf(stderr,
+		    "error: cannot unpack nvlist label %d\n", l);
+		return (err);
+	}
+
+	for (int i = 0; i < ARRAY_SIZE(cfg_keys); i++) {
+		uint64_t val;
+		err = nvlist_lookup_uint64(*cfg, cfg_keys[i], &val);
+		if (err) {
+			(void) fprintf(stderr,
+			    "error: label %d, %d: "
+			    "cannot find nvlist key %s\n",
+			    l, i, cfg_keys[i]);
+			return (err);
+		}
+	}
+
+	return (0);
+}
+
 static void
 zhack_repair_one_label(const zhack_repair_op_t op, const int fd,
     vdev_label_t *vl, const uint64_t label_offset, const int l,
@@ -956,10 +986,7 @@ zhack_repair_one_label(const zhack_repair_op_t op, const int fd,
 	    (zio_eck_t *)((char *)(vdev_data) + VDEV_PHYS_SIZE) - 1;
 	const uint64_t vdev_phys_offset =
 	    label_offset + offsetof(vdev_label_t, vl_vdev_phys);
-	const char *cfg_keys[] = { ZPOOL_CONFIG_VERSION,
-	    ZPOOL_CONFIG_POOL_STATE, ZPOOL_CONFIG_GUID };
 	nvlist_t *cfg;
-	nvlist_t *vdev_tree_cfg = NULL;
 	uint64_t ashift;
 	int byteswap;
 
@@ -967,18 +994,9 @@ zhack_repair_one_label(const zhack_repair_op_t op, const int fd,
 	if (err)
 		return;
 
-	if (vdev_eck->zec_magic == 0) {
-		(void) fprintf(stderr, "error: label %d: "
-		    "Expected the nvlist checksum magic number to not be zero"
-		    "\n",
-		    l);
-		(void) fprintf(stderr, "There should already be a checksum "
-		    "for the label.\n");
+	err = zhack_repair_get_byteswap(vdev_eck, l, &byteswap);
+	if (err)
 		return;
-	}
-
-	byteswap =
-	    (vdev_eck->zec_magic == BSWAP_64((uint64_t)ZEC_MAGIC));
 
 	if (byteswap) {
 		byteswap_uint64_array(&vdev_eck->zec_cksum,
@@ -994,16 +1012,7 @@ zhack_repair_one_label(const zhack_repair_op_t op, const int fd,
 		return;
 	}
 
-	err = nvlist_unpack(vl->vl_vdev_phys.vp_nvlist,
-	    VDEV_PHYS_SIZE - sizeof (zio_eck_t), &cfg, 0);
-	if (err) {
-		(void) fprintf(stderr,
-		    "error: cannot unpack nvlist label %d\n", l);
-		return;
-	}
-
-	err = zhack_repair_check_label(ub,
-	    l, cfg_keys, ARRAY_SIZE(cfg_keys), cfg, vdev_tree_cfg, &ashift);
+	err = zhack_repair_unpack_cfg(vl, l, &cfg);
 	if (err)
 		return;
 
@@ -1011,6 +1020,19 @@ zhack_repair_one_label(const zhack_repair_op_t op, const int fd,
 		char *buf;
 		size_t buflen;
 
+		if (ub->ub_txg != 0) {
+			(void) fprintf(stderr,
+			    "error: label %d: UB TXG of 0 expected, but got %"
+			    PRIu64 "\n", l, ub->ub_txg);
+			(void) fprintf(stderr, "It would appear the device was "
+			    "not properly detached.\n");
+			return;
+		}
+
+		err = zhack_repair_get_ashift(cfg, l, &ashift);
+		if (err)
+			return;
+
 		err = zhack_repair_undetach(ub, cfg, l);
 		if (err)
 			return;