diff --git a/sys/fs/nfsclient/nfs_clvnops.c.alloc b/sys/fs/nfsclient/nfs_clvnops.c
--- a/sys/fs/nfsclient/nfs_clvnops.c.alloc
+++ b/sys/fs/nfsclient/nfs_clvnops.c
@@ -3731,7 +3731,7 @@
 			if ((uint64_t)alen > nfs_maxalloclen)
 				alen = nfs_maxalloclen;
 			error = nfsrpc_allocate(vp, *ap->a_offset, alen,
-			    &nfsva, &attrflag, td->td_ucred, td, NULL);
+			    &nfsva, &attrflag, ap->a_cred, td, NULL);
 		}
 		if (error == 0) {
 			*ap->a_offset += alen;
diff --git a/sys/fs/nfsserver/nfs_nfsdport.c.alloc b/sys/fs/nfsserver/nfs_nfsdport.c
--- a/sys/fs/nfsserver/nfs_nfsdport.c.alloc
+++ b/sys/fs/nfsserver/nfs_nfsdport.c
@@ -6608,7 +6608,7 @@
 		olen = len;
 		NFSD_DEBUG(4, "nfsvno_allocate: at VOP_ALLOCATE %jd %jd\n",
 		    (intmax_t)off, (intmax_t)len);
-		error = VOP_ALLOCATE(vp, &off, &len);
+		error = VOP_ALLOCATE(vp, &off, &len, IO_SYNC, cred);
 		NFSD_DEBUG(4, "nfsvno_allocate: aft VOP_ALLOCATE %jd %jd %d\n",
 		    (intmax_t)off, (intmax_t)len, error);
 		if (error == 0 && len > 0 && olen > len)
diff --git a/sys/kern/vfs_default.c.alloc b/sys/kern/vfs_default.c
--- a/sys/kern/vfs_default.c.alloc
+++ b/sys/kern/vfs_default.c
@@ -963,7 +963,7 @@
 	len = *ap->a_len;
 	offset = *ap->a_offset;
 
-	error = VOP_GETATTR(vp, vap, td->td_ucred);
+	error = VOP_GETATTR(vp, vap, ap->a_cred);
 	if (error != 0)
 		goto out;
 	fsize = vap->va_size;
@@ -1000,12 +1000,12 @@
 		 */
 		VATTR_NULL(vap);
 		vap->va_size = offset + len;
-		error = VOP_SETATTR(vp, vap, td->td_ucred);
+		error = VOP_SETATTR(vp, vap, ap->a_cred);
 		if (error != 0)
 			goto out;
 		VATTR_NULL(vap);
 		vap->va_size = fsize;
-		error = VOP_SETATTR(vp, vap, td->td_ucred);
+		error = VOP_SETATTR(vp, vap, ap->a_cred);
 		if (error != 0)
 			goto out;
 	}
@@ -1031,7 +1031,7 @@
 			auio.uio_segflg = UIO_SYSSPACE;
 			auio.uio_rw = UIO_READ;
 			auio.uio_td = td;
-			error = VOP_READ(vp, &auio, 0, td->td_ucred);
+			error = VOP_READ(vp, &auio, ap->a_ioflag, ap->a_cred);
 			if (error != 0)
 				break;
 			if (auio.uio_resid > 0) {
@@ -1052,7 +1052,7 @@
 		auio.uio_rw = UIO_WRITE;
 		auio.uio_td = td;
 
-		error = VOP_WRITE(vp, &auio, 0, td->td_ucred);
+		error = VOP_WRITE(vp, &auio, ap->a_ioflag, ap->a_cred);
 		if (error != 0)
 			break;
 
diff --git a/sys/kern/vfs_vnops.c.alloc b/sys/kern/vfs_vnops.c
--- a/sys/kern/vfs_vnops.c.alloc
+++ b/sys/kern/vfs_vnops.c
@@ -3471,7 +3471,8 @@
 		error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
 		if (error == 0)
 #endif
-			error = VOP_ALLOCATE(vp, &offset, &len);
+			error = VOP_ALLOCATE(vp, &offset, &len, 0,
+			    td->td_ucred);
 		VOP_UNLOCK(vp);
 		vn_finished_write(mp);
 
diff --git a/sys/kern/vnode_if.src.alloc b/sys/kern/vnode_if.src
--- a/sys/kern/vnode_if.src.alloc
+++ b/sys/kern/vnode_if.src
@@ -703,6 +703,8 @@
 	IN struct vnode *vp;
 	INOUT off_t *offset;
 	INOUT off_t *len;
+	IN int ioflag;
+	IN struct ucred *cred;
 };