Subject: Re: [PATCH] Fix checkout of large files to network shares under Windows XP

From: Johannes Sixt <[email-masked]>
Date: Fri, 30 Apr 2010 10:46:52 +0200

Am 4/29/2010 22:01, schrieb René Scharfe:
> +#undef write
> +ssize_t mingw_write(int fd, const void *buf, size_t count)
> +{
> +	/*
> +	 * While write() calls to a file on a local disk are translated
> +	 * into WriteFile() calls with a maximum size of 64KB on Windows
> +	 * XP and 256KB on Vista, no such cap is placed on writes to
> +	 * files over the network on Windows XP.  Unfortunately, there
> +	 * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
> +	 * bigger writes fail on Windows XP.
> +	 * So we cap to a nice 31MB here to avoid write failures over
> +	 * the net without changing the number of WriteFile() calls in
> +	 * the local case.
> +	 */
> +	return write(fd, buf, min(count, 31 * 1024 * 1024));
> +}
> +

Thanks, I have verified that this fixes the problem in my setup as well.
I'll queue the patch with the below test case squashed in.

-- Hannes

diff --git a/t/t5705-clone-2gb.sh b/t/t5705-clone-2gb.sh
index adfaae8..8afbdd4 100755
--- a/t/t5705-clone-2gb.sh
+++ b/t/t5705-clone-2gb.sh
@@ -12,7 +12,7 @@ test_expect_success 'setup' '

 	git config pack.compression 0 &&
 	git config pack.depth 0 &&
-	blobsize=$((20*1024*1024)) &&
+	blobsize=$((100*1024*1024)) &&
 	blobcount=$((2*1024*1024*1024/$blobsize+1)) &&
 	i=1 &&
 	(while test $i -le $blobcount
@@ -36,9 +36,15 @@ test_expect_success 'setup' '

 '

-test_expect_success 'clone' '
+test_expect_success 'clone - bare' '

-	git clone --bare --no-hardlinks . clone
+	git clone --bare --no-hardlinks . clone-bare
+
+'
+
+test_expect_success 'clone - with worktree, file:// protocol' '
+
+	git clone file://. clone-wt

 '