Implement cbd tune plus some cleanup and rearranging

Still need to implement cbd tune --repack.

cbd/cbd.c

@@ -539,7 +539,7 @@ do_tune(int argc, char** argv)
     uint64_t optval;
     uint level = 0;
     bool repack = false;
-    bool zero_detect = false;
+    tristate_t zero_detect = t_none;
 
     char dev[PATH_MAX];
 
@@ -564,7 +564,7 @@ do_tune(int argc, char** argv)
                     error("Failed to parse \"%s\"\n", optarg);
                 }
             }
-            zero_detect = (optval != 0);
+            zero_detect = (optval ? t_true : t_false);
             break;
         default:
             usage();

include/libcbd.h

@@ -85,6 +85,6 @@ int    cbd_check(const char* dev,
 int    cbd_resize(const char* dev,
         uint64_t lsize);
 int    cbd_tune(const char* dev,
-        bool zero_detect, uint level, bool repack);
+        tristate_t zero_detect, uint level, bool repack);
 
 #endif

libcbd/tune.c

@@ -6,7 +6,7 @@
 
 int
 cbd_tune(const char* dev,
-         bool zero_detect, uint level, bool repack)
+         tristate_t zero_detect, uint level, bool repack)
 {
     int fd;
     uint8_t header_buf[SECTOR_SIZE];
@@ -20,11 +20,13 @@ cbd_tune(const char* dev,
     cbd_header_get(header_buf, &header);
     cbd_check_header(&header);
 
-    if (zero_detect) {
-        header.params.flags |= CBD_FLAG_DETECT_ZEROS;
-    }
-    else {
-        header.params.flags &= ~CBD_FLAG_DETECT_ZEROS;
+    if (zero_detect != t_none) {
+        if (zero_detect == t_true) {
+            header.params.flags |= CBD_FLAG_DETECT_ZEROS;
+        }
+        else {
+            header.params.flags &= ~CBD_FLAG_DETECT_ZEROS;
+        }
     }
     if (level) {
         cbd_compression_level_put(&header.params, level);