migration: Move migrate_use_block() to options.c

Once that we are there, we rename the function to migrate_block()
to be consistent with all other capabilities.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>

migration/block.c

@@ -1001,7 +1001,7 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
 
 static bool block_is_active(void *opaque)
 {
-    return migrate_use_block();
+    return migrate_block();
 }
 
 static SaveVMHandlers savevm_block_handlers = {

migration/migration.c

@@ -2415,7 +2415,7 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc,
             error_setg(errp, "No disk migration is required in COLO mode");
             return false;
         }
-        if (migrate_use_block() || migrate_use_block_incremental()) {
+        if (migrate_block() || migrate_use_block_incremental()) {
             error_setg(errp, "Command options are incompatible with "
                        "current migration capabilities");
             return false;
@@ -2622,15 +2622,6 @@ static int64_t migrate_max_postcopy_bandwidth(void)
     return s->parameters.max_postcopy_bandwidth;
 }
 
-bool migrate_use_block(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->capabilities[MIGRATION_CAPABILITY_BLOCK];
-}
-
 bool migrate_use_return_path(void)
 {
     MigrationState *s;

migration/migration.h

@@ -457,7 +457,6 @@ int migrate_multifd_zstd_level(void);
 int migrate_use_tls(void);
 uint64_t migrate_xbzrle_cache_size(void);
 
-bool migrate_use_block(void);
 bool migrate_use_block_incremental(void);
 int migrate_max_cpu_throttle(void);
 bool migrate_use_return_path(void);

migration/options.c

@@ -33,6 +33,15 @@ bool migrate_background_snapshot(void)
     return s->capabilities[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT];
 }
 
+bool migrate_block(void)
+{
+    MigrationState *s;
+
+    s = migrate_get_current();
+
+    return s->capabilities[MIGRATION_CAPABILITY_BLOCK];
+}
+
 bool migrate_colo(void)
 {
     MigrationState *s = migrate_get_current();

migration/options.h

@@ -18,6 +18,7 @@
 
 bool migrate_auto_converge(void);
 bool migrate_background_snapshot(void);
+bool migrate_block(void);
 bool migrate_colo(void);
 bool migrate_compress(void);
 bool migrate_dirty_bitmaps(void);

migration/savevm.c

@@ -1612,7 +1612,7 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
         return -EINVAL;
     }
 
-    if (migrate_use_block()) {
+    if (migrate_block()) {
         error_setg(errp, "Block migration and snapshots are incompatible");
         return -EINVAL;
     }