common: Don't call ioctl(BTRFS_IOC_SYNC) in sync_filesystem.

From the manual of syncfs, it first appeared in Linux 2.6.39. At this
point, btrfs didn't as a stable production. So remove this.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>

diff --git a/src/common/sync_filesystem.h b/src/common/sync_filesystem.h
index 49283b3e0aefa131df87bcdb1841e91d7ee5556c..b7eaea71e0ed5e8b9a5a4bfe2c415391eff3d6fa 100644 (file)
--- a/src/common/sync_filesystem.h
+++ b/src/common/sync_filesystem.h
@@ -48,11 +48,6 @@ inline int sync_filesystem(int fd)
     return -errno;
 #endif
 
-#ifdef BTRFS_IOC_SYNC
-  if (::ioctl(fd, BTRFS_IOC_SYNC) == 0)
-    return 0;
-#endif
-
   sync();
   return 0;
 }