1 files changed, 54 insertions, 0 deletions
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 1bc26466eb72..34595f482718 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -195,6 +195,60 @@ void afs_create_write_requests(struct netfs_io_request *wreq, loff_t start, size
 }
 
 /*
+ * Writeback calls this when it finds a folio that needs uploading.  This isn't
+ * called if writeback only has copy-to-cache to deal with.
+ */
+void afs_begin_writeback(struct netfs_io_request *wreq)
+{
+	wreq->io_streams[0].avail = true;
+}
+
+/*
+ * Prepare a subrequest to write to the server.  This sets the max_len
+ * parameter.
+ */
+void afs_prepare_write(struct netfs_io_subrequest *subreq)
+{
+	//if (test_bit(NETFS_SREQ_RETRYING, &subreq->flags))
+	//	subreq->max_len = 512 * 1024;
+	//else
+	subreq->max_len = 256 * 1024 * 1024;
+}
+
+/*
+ * Issue a subrequest to write to the server.
+ */
+static void afs_issue_write_worker(struct work_struct *work)
+{
+	struct netfs_io_subrequest *subreq = container_of(work, struct netfs_io_subrequest, work);
+	struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode);
+	ssize_t ret;
+
+	_enter("%x[%x],%zx",
+	       subreq->rreq->debug_id, subreq->debug_index, subreq->io_iter.count);
+
+#if 0 // Error injection
+	if (subreq->debug_index == 3)
+		return netfs_write_subrequest_terminated(subreq, -ENOANO, false);
+
+	if (!test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) {
+		set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
+		return netfs_write_subrequest_terminated(subreq, -EAGAIN, false);
+	}
+#endif
+
+	ret = afs_store_data(vnode, &subreq->io_iter, subreq->start);
+	netfs_write_subrequest_terminated(subreq, ret < 0 ? ret : subreq->len, false);
+}
+
+void afs_issue_write(struct netfs_io_subrequest *subreq)
+{
+	subreq->work.func = afs_issue_write_worker;
+	if (!queue_work(system_unbound_wq, &subreq->work))
+		WARN_ON_ONCE(1);
+}
+
+/*
  * write some of the pending data back to the server
  */
 int afs_writepages(struct address_space *mapping, struct writeback_control *wbc)