Implement TFile::Fallocate for Windows.

66f69cf2778ef870c0ddb050d260160ce8be1c3f

1 files changed, 6 insertions, 0 deletions

diff --git a/util/system/file.cpp b/util/system/file.cpp
index d9acde845d6..30bba71a038 100644
--- a/util/system/file.cpp
+++ b/util/system/file.cpp
@@ -446,6 +446,12 @@ bool TFileHandle::FallocateNoResize(i64 length) noexcept {
     }
 #if defined(_linux_) && (!defined(_android_) || __ANDROID_API__ >= 21)
     return !fallocate(Fd_, FALLOC_FL_KEEP_SIZE, 0, length);
+#elif defined(_win_)
+    FILE_ALLOCATION_INFO allocInfo = {};
+    allocInfo.AllocationSize.QuadPart = length;
+
+    return SetFileInformationByHandle(Fd_, FileAllocationInfo, &allocInfo,
+                                      sizeof(FILE_ALLOCATION_INFO));
 #else
     Y_UNUSED(length);
     return true;