diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
index 5a43fbe..752bf7a 100644
--- a/fs/nfs/objlayout/objio_osd.c
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -46,6 +46,69 @@
 
 #define _LLU(x) ((unsigned long long)x)
 
+/* A per mountpoint struct currently for device cache */
+struct objio_mount_type {
+	struct list_head dev_list;
+	spinlock_t dev_list_lock;
+};
+
+struct _dev_ent {
+	struct list_head list;
+	struct nfs4_deviceid d_id;
+	struct osd_dev *od;
+};
+
+static struct osd_dev *___dev_list_find(struct objio_mount_type *omt,
+	struct nfs4_deviceid *d_id)
+{
+	struct list_head *le;
+
+	list_for_each(le, &omt->dev_list) {
+		struct _dev_ent *de = list_entry(le, struct _dev_ent, list);
+
+		if (0 == memcmp(&de->d_id, d_id, sizeof(*d_id)))
+			return de->od;
+	}
+
+	return NULL;
+}
+
+static struct osd_dev *_dev_list_find(struct objio_mount_type *omt,
+	struct nfs4_deviceid *d_id)
+{
+	struct osd_dev *od;
+
+	spin_lock(&omt->dev_list_lock);
+	od = ___dev_list_find(omt, d_id);
+	spin_unlock(&omt->dev_list_lock);
+	return od;
+}
+
+static int _dev_list_add(struct objio_mount_type *omt,
+	struct nfs4_deviceid *d_id, struct osd_dev *od,
+	gfp_t gfp_flags)
+{
+	struct _dev_ent *de = kzalloc(sizeof(*de), gfp_flags);
+
+	if (!de)
+		return -ENOMEM;
+
+	spin_lock(&omt->dev_list_lock);
+
+	if (___dev_list_find(omt, d_id)) {
+		kfree(de);
+		goto out;
+	}
+
+	de->d_id = *d_id;
+	de->od = od;
+	list_add(&de->list, &omt->dev_list);
+
+out:
+	spin_unlock(&omt->dev_list_lock);
+	return 0;
+}
+
 struct caps_buffers {
 	u8 caps_key[OSD_CRYPTO_KEYID_SIZE];
 	u8 creds[OSD_CAP_LEN];
@@ -74,6 +137,90 @@ OBJIO_LSEG(struct pnfs_layout_segment *lseg)
 	return container_of(lseg, struct objio_segment, lseg);
 }
 
+/* Send and wait for a get_device_info of devices in the layout,
+   then look them up with the osd_initiator library */
+static struct osd_dev *_device_lookup(struct pnfs_layout_hdr *pnfslay,
+				struct objio_segment *objio_seg, unsigned comp,
+				gfp_t gfp_flags)
+{
+	struct pnfs_osd_deviceaddr *deviceaddr;
+	struct nfs4_deviceid *d_id;
+	struct osd_dev *od;
+	struct osd_dev_info odi;
+	struct objio_mount_type *omt =
+				   NFS_SERVER(pnfslay->plh_inode)->pnfs_ld_data;
+	int err;
+
+	d_id = &objio_seg->comps[comp].oc_object_id.oid_device_id;
+
+	od = _dev_list_find(omt, d_id);
+	if (od)
+		return od;
+
+	err = objlayout_get_deviceinfo(pnfslay, d_id, &deviceaddr, gfp_flags);
+	if (unlikely(err)) {
+		dprintk("%s: objlayout_get_deviceinfo dev(%llx:%llx) =>%d\n",
+			__func__, _DEVID_LO(d_id), _DEVID_HI(d_id), err);
+		return ERR_PTR(err);
+	}
+
+	odi.systemid_len = deviceaddr->oda_systemid.len;
+	if (odi.systemid_len > sizeof(odi.systemid)) {
+		err = -EINVAL;
+		goto out;
+	} else if (odi.systemid_len)
+		memcpy(odi.systemid, deviceaddr->oda_systemid.data,
+		       odi.systemid_len);
+	odi.osdname_len	 = deviceaddr->oda_osdname.len;
+	odi.osdname	 = (u8 *)deviceaddr->oda_osdname.data;
+
+	if (!odi.osdname_len && !odi.systemid_len) {
+		dprintk("%s: !odi.osdname_len && !odi.systemid_len\n",
+			__func__);
+		err = -ENODEV;
+		goto out;
+	}
+
+	od = osduld_info_lookup(&odi);
+	if (unlikely(IS_ERR(od))) {
+		err = PTR_ERR(od);
+		dprintk("%s: osduld_info_lookup => %d\n", __func__, err);
+		goto out;
+	}
+
+	_dev_list_add(omt, d_id, od, gfp_flags);
+
+out:
+	dprintk("%s: return=%d\n", __func__, err);
+	objlayout_put_deviceinfo(deviceaddr);
+	return err ? ERR_PTR(err) : od;
+}
+
+static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay,
+	struct objio_segment *objio_seg,
+	gfp_t gfp_flags)
+{
+	unsigned i;
+	int err;
+
+	/* lookup all devices */
+	for (i = 0; i < objio_seg->num_comps; i++) {
+		struct osd_dev *od;
+
+		od = _device_lookup(pnfslay, objio_seg, i, gfp_flags);
+		if (unlikely(IS_ERR(od))) {
+			err = PTR_ERR(od);
+			goto out;
+		}
+		objio_seg->ods[i] = od;
+	}
+	err = 0;
+
+out:
+	dprintk("%s: return=%d\n", __func__, err);
+	return err;
+}
+
 static int _verify_data_map(struct pnfs_osd_layout *layout)
 {
 	struct pnfs_osd_data_map *data_map = &layout->olo_map;
@@ -170,6 +317,9 @@ extern int objio_alloc_lseg(struct pnfs_layout_segment **outp,
 
 	objio_seg->num_comps = layout.olo_num_comps;
 	objio_seg->comps_index = layout.olo_comps_index;
+	err = objio_devices_lookup(pnfslay, objio_seg, gfp_flags);
+	if (err)
+		goto err;
 
 	objio_seg->mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
 	objio_seg->stripe_unit = layout.olo_map.odm_stripe_unit;
diff --git a/fs/nfs/objlayout/objlayout.c b/fs/nfs/objlayout/objlayout.c
index 9465267..10e5fca 100644
--- a/fs/nfs/objlayout/objlayout.c
+++ b/fs/nfs/objlayout/objlayout.c
@@ -102,3 +102,71 @@ objlayout_free_lseg(struct pnfs_layout_segment *lseg)
 	objio_free_lseg(lseg);
 }
 
+/*
+ * Get Device Info API for io engines
+ */
+struct objlayout_deviceinfo {
+	struct page *page;
+	struct pnfs_osd_deviceaddr da; /* This must be last */
+};
+
+/* Initialize and call nfs_getdeviceinfo, then decode and return a
+ * "struct pnfs_osd_deviceaddr *" Eventually objlayout_put_deviceinfo()
+ * should be called.
+ */
+int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
+	struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr,
+	gfp_t gfp_flags)
+{
+	struct objlayout_deviceinfo *odi;
+	struct pnfs_device pd;
+	struct super_block *sb;
+	struct page *page, **pages;
+	u32 *p;
+	int err;
+
+	page = alloc_page(gfp_flags);
+	if (!page)
+		return -ENOMEM;
+
+	pages = &page;
+	pd.pages = pages;
+
+	memcpy(&pd.dev_id, d_id, sizeof(*d_id));
+	pd.layout_type = LAYOUT_OSD2_OBJECTS;
+	pd.pages = &page;
+	pd.pgbase = 0;
+	pd.pglen = PAGE_SIZE;
+	pd.mincount = 0;
+
+	sb = pnfslay->plh_inode->i_sb;
+	err = nfs4_proc_getdeviceinfo(NFS_SERVER(pnfslay->plh_inode), &pd);
+	dprintk("%s nfs_getdeviceinfo returned %d\n", __func__, err);
+	if (err)
+		goto err_out;
+
+	p = page_address(page);
+	odi = kzalloc(sizeof(*odi), gfp_flags);
+	if (!odi) {
+		err = -ENOMEM;
+		goto err_out;
+	}
+	pnfs_osd_xdr_decode_deviceaddr(&odi->da, p);
+	odi->page = page;
+	*deviceaddr = &odi->da;
+	return 0;
+
+err_out:
+	__free_page(page);
+	return err;
+}
+
+void objlayout_put_deviceinfo(struct pnfs_osd_deviceaddr *deviceaddr)
+{
+	struct objlayout_deviceinfo *odi = container_of(deviceaddr,
+						struct objlayout_deviceinfo,
+						da);
+
+	__free_page(odi->page);
+	kfree(odi);
+}
diff --git a/fs/nfs/objlayout/objlayout.h b/fs/nfs/objlayout/objlayout.h
index 066280a..0814271 100644
--- a/fs/nfs/objlayout/objlayout.h
+++ b/fs/nfs/objlayout/objlayout.h
@@ -56,6 +56,14 @@ extern int objio_alloc_lseg(struct pnfs_layout_segment **outp,
 extern void objio_free_lseg(struct pnfs_layout_segment *lseg);
 
 /*
+ * callback API
+ */
+extern int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
+	struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr,
+	gfp_t gfp_flags);
+extern void objlayout_put_deviceinfo(struct pnfs_osd_deviceaddr *deviceaddr);
+
+/*
  * exported generic objects function vectors
  */
 extern struct pnfs_layout_segment *objlayout_alloc_lseg(
