virtiofsd: Make fsync work even if only inode is passed in

If caller has not sent file handle in request, then using inode, retrieve
the fd opened using O_PATH and use that to open file again and issue
fsync. This will be needed when dax_flush() calls fsync. At that time
we only have inode information (and not file).

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
index 514d79cb24..8552cfb8af 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -1075,7 +1075,11 @@ static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)
     fi.fh = arg->fh;
 
     if (req->se->op.fsync) {
-        req->se->op.fsync(req, nodeid, datasync, &fi);
+        if (fi.fh == (uint64_t)-1) {
+            req->se->op.fsync(req, nodeid, datasync, NULL);
+        } else {
+            req->se->op.fsync(req, nodeid, datasync, &fi);
+        }
     } else {
         fuse_reply_err(req, ENOSYS);
     }