Make zdb display the compression algorithm and level

Signed-off-by: Allan Jude <allan@klarasystems.com>

Author: allanjude

cmd/zdb/zdb.c

@@ -2795,9 +2795,26 @@ dump_object(objset_t *os, uint64_t object, int verbosity,
 		    " (K=%s)", ZDB_CHECKSUM_NAME(doi.doi_checksum));
 	}
 
-	if (doi.doi_compress != ZIO_COMPRESS_INHERIT || verbosity >= 6) {
+	if (doi.doi_compress != ZIO_COMPRESS_INHERIT) {
 		(void) snprintf(aux + strlen(aux), sizeof (aux) - strlen(aux),
 		    " (Z=%s)", ZDB_COMPRESS_NAME(doi.doi_compress));
+	} else if (ZIO_COMPRESS_HASLEVEL(os->os_compress)) {
+		const char *compname = NULL;
+		if (zfs_prop_index_to_string(ZFS_PROP_COMPRESSION,
+		    ZIO_COMPRESS_RAW(os->os_compress, os->os_complevel),
+		    &compname) == 0) {
+			(void) snprintf(aux + strlen(aux),
+			    sizeof (aux) - strlen(aux), " (Z=inherit=%s)",
+			    compname);
+		} else {
+			(void) snprintf(aux + strlen(aux),
+			    sizeof (aux) - strlen(aux),
+			    " (Z=inherit=%s-unknown)",
+			    ZDB_COMPRESS_NAME(os->os_compress));
+		}
+	} else {
+		(void) snprintf(aux + strlen(aux), sizeof (aux) - strlen(aux),
+		    " (Z=inherit=%s)", ZDB_COMPRESS_NAME(os->os_compress));
 	}
 
 	(void) printf("%10lld  %3u  %5s  %5s  %5s  %6s  %5s  %6s  %s%s\n",