fuse_big_writes: Allow big writes (and reads) if available

Speed up IO by doing >4kiB transfers, if supported by libfuse

1 files changed, 10 insertions, 0 deletions

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);