nfs: nfs_redirty_request

Both flush functions have the same error handling routine.  Pull
it out as a function.
Signed-off-by: NFred Isaman <iisaman@citi.umich.edu>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/write.c

@@ -282,8 +282,6 @@ static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
 	spin_unlock(&inode->i_lock);
 	if (!nfs_pageio_add_request(pgio, req)) {
 		nfs_redirty_request(req);
-		nfs_end_page_writeback(page);
-		nfs_clear_page_tag_locked(req);
 		return pgio->pg_error;
 	}
 	return 0;
@@ -402,7 +400,7 @@ static void nfs_inode_remove_request(struct nfs_page *req)
 }
 
 static void
-nfs_redirty_request(struct nfs_page *req)
+nfs_mark_request_dirty(struct nfs_page *req)
 {
 	__set_page_dirty_nobuffers(req->wb_page);
 }
@@ -456,7 +454,7 @@ int nfs_reschedule_unstable_write(struct nfs_page *req)
 		return 1;
 	}
 	if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) {
-		nfs_redirty_request(req);
+		nfs_mark_request_dirty(req);
 		return 1;
 	}
 	return 0;
@@ -847,6 +845,17 @@ static void nfs_write_rpcsetup(struct nfs_page *req,
 		rpc_put_task(task);
 }
 
+/* If a nfs_flush_* function fails, it should remove reqs from @head and
+ * call this on each, which will prepare them to be retried on next
+ * writeback using standard nfs.
+ */
+static void nfs_redirty_request(struct nfs_page *req)
+{
+	nfs_mark_request_dirty(req);
+	nfs_end_page_writeback(req->wb_page);
+	nfs_clear_page_tag_locked(req);
+}
+
 /*
  * Generate multiple small requests to write out a single
  * contiguous dirty area on one page.
@@ -902,8 +911,6 @@ static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned
 		nfs_writedata_release(data);
 	}
 	nfs_redirty_request(req);
-	nfs_end_page_writeback(req->wb_page);
-	nfs_clear_page_tag_locked(req);
 	return -ENOMEM;
 }
 
@@ -944,8 +951,6 @@ static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned i
 		req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
 		nfs_redirty_request(req);
-		nfs_end_page_writeback(req->wb_page);
-		nfs_clear_page_tag_locked(req);
 	}
 	return -ENOMEM;
 }
@@ -1298,7 +1303,7 @@ static void nfs_commit_done(struct rpc_task *task, void *calldata)
 		}
 		/* We have a mismatch. Write the page again */
 		dprintk(" mismatch\n");
-		nfs_redirty_request(req);
+		nfs_mark_request_dirty(req);
 	next:
 		nfs_clear_page_tag_locked(req);
 	}