Subject: [PATCH v3 07/11] core.fsync: use batch mode and sync loose objects by default on Windows

From: "Neeraj Singh via GitGitGadget" <[email-masked]>
Date: Thu, 24 Mar 2022 04:58:22 +0000

From: Neeraj Singh <[email-masked]>

Git for Windows has defaulted to core.fsyncObjectFiles=true since
September 2017. We turn on syncing of loose object files with batch mode
in upstream Git so that we can get broad coverage of the new code
upstream.

We don't actually do fsyncs in the most of the test suite, since
GIT_TEST_FSYNC is set to 0. However, we do exercise all of the
surrounding batch mode code since GIT_TEST_FSYNC merely makes the
maybe_fsync wrapper always appear to succeed.

Signed-off-by: Neeraj Singh <[email-masked]>
---
 cache.h           | 4 ++++
 compat/mingw.h    | 3 +++
 config.c          | 2 +-
 git-compat-util.h | 2 ++
 4 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/cache.h b/cache.h
index a5bf15a5131..7f6cbb254b4 100644
--- a/cache.h
+++ b/cache.h
@@ -1031,6 +1031,10 @@ enum fsync_component {
 			      FSYNC_COMPONENT_INDEX | \
 			      FSYNC_COMPONENT_REFERENCE)
 
+#ifndef FSYNC_COMPONENTS_PLATFORM_DEFAULT
+#define FSYNC_COMPONENTS_PLATFORM_DEFAULT FSYNC_COMPONENTS_DEFAULT
+#endif
+
 /*
  * A bitmask indicating which components of the repo should be fsynced.
  */
diff --git a/compat/mingw.h b/compat/mingw.h
index 6074a3d3ced..afe30868c04 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -332,6 +332,9 @@ int mingw_getpagesize(void);
 int win32_fsync_no_flush(int fd);
 #define fsync_no_flush win32_fsync_no_flush
 
+#define FSYNC_COMPONENTS_PLATFORM_DEFAULT (FSYNC_COMPONENTS_DEFAULT | FSYNC_COMPONENT_LOOSE_OBJECT)
+#define FSYNC_METHOD_DEFAULT (FSYNC_METHOD_BATCH)
+
 struct rlimit {
 	unsigned int rlim_cur;
 };
diff --git a/config.c b/config.c
index 511f4584eeb..e9cac5f4707 100644
--- a/config.c
+++ b/config.c
@@ -1342,7 +1342,7 @@ static const struct fsync_component_name {
 
 static enum fsync_component parse_fsync_components(const char *var, const char *string)
 {
-	enum fsync_component current = FSYNC_COMPONENTS_DEFAULT;
+	enum fsync_component current = FSYNC_COMPONENTS_PLATFORM_DEFAULT;
 	enum fsync_component positive = 0, negative = 0;
 
 	while (string) {
diff --git a/git-compat-util.h b/git-compat-util.h
index 0892e209a2f..fffe42ce7c1 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1257,11 +1257,13 @@ __attribute__((format (printf, 3, 4))) NORETURN
 void BUG_fl(const char *file, int line, const char *fmt, ...);
 #define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
 
+#ifndef FSYNC_METHOD_DEFAULT
 #ifdef __APPLE__
 #define FSYNC_METHOD_DEFAULT FSYNC_METHOD_WRITEOUT_ONLY
 #else
 #define FSYNC_METHOD_DEFAULT FSYNC_METHOD_FSYNC
 #endif
+#endif
 
 enum fsync_action {
 	FSYNC_WRITEOUT_ONLY,
-- 
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