From 40c0d808313724e1aa7b28c1fb5375f40f7ba920 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@ionos.com>
Date: Fri, 18 Oct 2024 18:15:29 +0200
Subject: [PATCH] io/CopyRegularFile: skip fallocate() for small files

Not worth the system call overhead.
---
 src/io/CopyRegularFile.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/io/CopyRegularFile.cxx b/src/io/CopyRegularFile.cxx
index 0c850519d..84f3d9002 100644
--- a/src/io/CopyRegularFile.cxx
+++ b/src/io/CopyRegularFile.cxx
@@ -58,7 +58,8 @@ CopyRegularFile(FileDescriptor src, FileDescriptor dst, off_t size)
 
 	posix_fadvise(src.Get(), 0, size, POSIX_FADV_SEQUENTIAL);
 
-	fallocate(dst.Get(), FALLOC_FL_KEEP_SIZE, 0, size);
+	if (size > 32768)
+		fallocate(dst.Get(), FALLOC_FL_KEEP_SIZE, 0, size);
 
 	while (size > 0) {
 		std::array<std::byte, 65536> buffer;