From 7db87a3f978a3b84ad5ff4baea9e313f559ebb08 Mon Sep 17 00:00:00 2001
From: Bernd Schubert <bernd.schubert@fastmail.fm>
Date: Sun, 20 Feb 2011 21:51:52 +0100
Subject: fuse_big_writes: Allow big writes (and reads) if available

Speed up IO by doing >4kiB transfers, if supported by libfuse
---
 src/unionfs.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/unionfs.c b/src/unionfs.c
index 7e0674f..726062b 100644
--- a/src/unionfs.c
+++ b/src/unionfs.c
@@ -16,6 +16,7 @@
 #endif
 
 #include <fuse.h>
+#include <fuse/fuse_common.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -843,6 +844,15 @@ int main(int argc, char *argv[]) {
 	}
 	unionfs_post_opts();
 
+#ifdef FUSE_CAP_BIG_WRITES
+	/* libfuse > 0.8 supports large IO, also for reads, to increase performance 
+	 * We support any IO sizes, so lets enable that option */
+	if (fuse_opt_add_arg(&args, "-obig_writes")) {
+		fprintf(stderr, "Failed to enable big writes!\n");
+		exit(1);
+	}
+#endif
+
 	umask(0);
 	int res = fuse_main(args.argc, args.argv, &unionfs_oper, NULL);
 	RETURN(uopt.doexit ? uopt.retval : res);
-- 
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