Add support for FOPEN_NOFLUSH flag

Allow requesting from kernel to avoid flush on close at file open
time.  If kernel does not support FOPEN_NOFLUSH flag, the request
will be ignored.

For passthrough_hp example, request to avoid flush on close when
writeback cache is disabled and file is opened O_RDONLY.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/example/passthrough_hp.cc b/example/passthrough_hp.cc
index 872fc73..e15f893 100644
--- a/example/passthrough_hp.cc
+++ b/example/passthrough_hp.cc
@@ -856,6 +856,7 @@ static void sfs_open(fuse_req_t req, fuse_ino_t ino, fuse_file_info *fi) {
     lock_guard<mutex> g {inode.m};
     inode.nopen++;
     fi->keep_cache = (fs.timeout != 0);
+    fi->noflush = (fs.timeout == 0 && (fi->flags & O_ACCMODE) == O_RDONLY);
     fi->fh = fd;
     fuse_reply_open(req, fi);
 }