1 files changed, 5 insertions, 0 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 052327bd6c9d..6c83ed052026 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1108,6 +1108,11 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
                 inarg.valid |= FATTR_FH;
                 inarg.fh = ff->fh;
         }
+        if (attr->ia_valid & ATTR_SIZE) {
+                /* For mandatory locking in truncate */
+                inarg.valid |= FATTR_LOCKOWNER;
+                inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
+        }
         req->in.h.opcode = FUSE_SETATTR;
         req->in.h.nodeid = get_node_id(inode);
         req->in.numargs = 1;