[sheepdog] [PATCH 2/3] add check for version of fuse before using 'big_writes'

[Robin Dong]

From: Robin Dong <sanbai at taobao.com>

The feature 'big_writes' in fuse only be supported from fuse-2.8, so if the fuse-library
in the system is lower than 2.8, we would not use option "-obig_writes".

Signed-off-by: Robin Dong <sanbai at taobao.com>
---
 sheepfs/core.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/sheepfs/core.c b/sheepfs/core.c
index 71253aa..2d9cd6a 100644
--- a/sheepfs/core.c
+++ b/sheepfs/core.c
@@ -258,7 +258,9 @@ static int sheepfs_main_loop(char *mountpoint)
 
 	fuse_opt_add_arg(&args, "sheepfs"); /* placeholder for argv[0] */
 	fuse_opt_add_arg(&args, "-oallow_root");
-	fuse_opt_add_arg(&args, "-obig_writes");
+	/* 'big_writes' support only from fuse-2.8 */
+	if (FUSE_USE_VERSION >= 28)
+		fuse_opt_add_arg(&args, "-obig_writes");
 	fuse_opt_add_arg(&args, "-okernel_cache");
 	fuse_opt_add_arg(&args, "-ofsname=sheepfs");
 	fuse_opt_add_arg(&args, mountpoint);
-- 
1.7.3.2