block: detect DKIOCGETBLOCKCOUNT/SIZE before use

iOS hosts do not have these defined so we fallback to the
default behaviour.

Co-authored-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Joelle van Dyne <j@getutm.app>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/block/file-posix.c b/block/file-posix.c
index f16d987c070a28e8d6cffc49dc9c5e2fad3fe3ec..74b8216077e0ee0303cfabab60ceb52f80f71e62 100644 (file)
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -2341,7 +2341,7 @@ again:
             }
         }
 #endif
-#if defined(__APPLE__) && defined(__MACH__)
+#if defined(DKIOCGETBLOCKCOUNT) && defined(DKIOCGETBLOCKSIZE)
         if (size == 0) {
             uint64_t sectors = 0;
             uint32_t sector_size = 0;