This commit adds protection against a platform-specific feature in

polar_vfs.

In particular:

- Gate .vfs_posix_fallocate behind HAVE_POSIX_FALLOCATE across VFS managers.
Wrap .vfs_posix_fallocate assignments with HAVE_POSIX_FALLOCATE and set to
NULL when the platform does not provide posix_fallocate.

Author: Giperboloid

src/backend/storage/file/polar_fd.c

@@ -104,7 +104,11 @@ vfs_mgr		polar_vfs[] =
 		.vfs_fsync = pg_fsync,
 		.vfs_unlink = unlink,
 		.vfs_rename = rename,
+#ifdef HAVE_POSIX_FALLOCATE
 		.vfs_posix_fallocate = posix_fallocate,
+#else
+		.vfs_posix_fallocate = NULL,
+#endif
 #ifdef __linux__
 		.vfs_fallocate = fallocate,
 #else

src/polar_vfs/polar_bufferio.c

@@ -57,7 +57,11 @@ const vfs_mgr polar_vfs_bio =
 #endif
 	.vfs_unlink = unlink,
 	.vfs_rename = rename,
+#ifdef HAVE_POSIX_FALLOCATE
 	.vfs_posix_fallocate = posix_fallocate,
+#else
+	.vfs_posix_fallocate = NULL,
+#endif
 #ifdef __linux__
 	.vfs_fallocate = fallocate,
 #else

src/polar_vfs/polar_directio.c

@@ -79,7 +79,11 @@ const vfs_mgr polar_vfs_dio =
 	.vfs_fsync = polar_directio_fsync,
 	.vfs_unlink = unlink,
 	.vfs_rename = rename,
+#ifdef HAVE_POSIX_FALLOCATE
 	.vfs_posix_fallocate = posix_fallocate,
+#else
+	.vfs_posix_fallocate = NULL,
+#endif
 #ifdef __linux__
 	.vfs_fallocate = fallocate,
 #else

src/polar_vfs/polar_vfs_fe.c

@@ -105,7 +105,11 @@ vfs_mgr		polar_vfs[] =
 		.vfs_fsync = fsync,
 		.vfs_unlink = unlink,
 		.vfs_rename = rename,
+#ifdef HAVE_POSIX_FALLOCATE
 		.vfs_posix_fallocate = posix_fallocate,
+#else
+		.vfs_posix_fallocate = NULL,
+#endif
 #ifdef __linux__
 		.vfs_fallocate = fallocate,
 #else