nfsd: fix nfsd_vfs_read() splice actor setup

When nfsd was transitioned to use splice instead of sendfile() for data
transfers, a line setting the page index was lost. Restore it, so that
nfsd is functional when that path is used.

Signed-off-by: Jens Axboe <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/nfsd/vfs.c

···
 			.u.data		= rqstp,
 		};
 
+		rqstp->rq_resused = 1;
 		host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
 	} else {
 		oldfs = get_fs();