libceph: rename r_unsafe_item to r_private_item

This list item remained from when we had safe and unsafe replies
(commit vs ack).  It has since become a private list item for use by
clients.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/file.c

@@ -1026,7 +1026,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
 			req->r_callback = ceph_aio_complete_req;
 			req->r_inode = inode;
 			req->r_priv = aio_req;
-			list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
+			list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
 
 			pos += len;
 			continue;
@@ -1086,8 +1086,8 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
 		while (!list_empty(&osd_reqs)) {
 			req = list_first_entry(&osd_reqs,
 					       struct ceph_osd_request,
-					       r_unsafe_item);
-			list_del_init(&req->r_unsafe_item);
+					       r_private_item);
+			list_del_init(&req->r_private_item);
 			if (ret >= 0)
 				ret = ceph_osdc_start_request(req->r_osdc,
 							      req, false);

include/linux/ceph/osd_client.h

@@ -198,9 +198,9 @@ struct ceph_osd_request {
 	bool              r_mempool;
 	struct completion r_completion;       /* private to osd_client.c */
 	ceph_osdc_callback_t r_callback;
-	struct list_head  r_unsafe_item;
 
 	struct inode *r_inode;         	      /* for use by callbacks */
+	struct list_head r_private_item;      /* ditto */
 	void *r_priv;			      /* ditto */
 
 	/* set by submitter */

net/ceph/osd_client.c

@@ -478,7 +478,7 @@ static void request_release_checks(struct ceph_osd_request *req)
 {
 	WARN_ON(!RB_EMPTY_NODE(&req->r_node));
 	WARN_ON(!RB_EMPTY_NODE(&req->r_mc_node));
-	WARN_ON(!list_empty(&req->r_unsafe_item));
+	WARN_ON(!list_empty(&req->r_private_item));
 	WARN_ON(req->r_osd);
 }
 
@@ -538,7 +538,7 @@ static void request_init(struct ceph_osd_request *req)
 	init_completion(&req->r_completion);
 	RB_CLEAR_NODE(&req->r_node);
 	RB_CLEAR_NODE(&req->r_mc_node);
-	INIT_LIST_HEAD(&req->r_unsafe_item);
+	INIT_LIST_HEAD(&req->r_private_item);
 
 	target_init(&req->r_t);
 }