NFSv4.1: pnfs filelayout driver write

[linux-2.6-block.git] / fs / nfs / nfs4filelayout.c

diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 9d21bfeec88f200ebfe2c20d87f04609cb07c05a..7e1d4571b7b225cf09d88689797a2dbb5b08cafb 100644 (file)
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -189,12 +189,69 @@ static void filelayout_read_release(void *data)
        rdata->mds_ops->rpc_release(data);
 }
 
+static int filelayout_write_done_cb(struct rpc_task *task,
+                               struct nfs_write_data *data)
+{
+       int reset = 0;
+
+       if (filelayout_async_handle_error(task, data->args.context->state,
+                                         data->ds_clp, &reset) == -EAGAIN) {
+               struct nfs_client *clp;
+
+               dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
+                       __func__, data->ds_clp, data->ds_clp->cl_session);
+               if (reset) {
+                       filelayout_set_lo_fail(data->lseg);
+                       nfs4_reset_write(task, data);
+                       clp = NFS_SERVER(data->inode)->nfs_client;
+               } else
+                       clp = data->ds_clp;
+               nfs_restart_rpc(task, clp);
+               return -EAGAIN;
+       }
+
+       return 0;
+}
+
+static void filelayout_write_prepare(struct rpc_task *task, void *data)
+{
+       struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+       if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
+                               &wdata->args.seq_args, &wdata->res.seq_res,
+                               0, task))
+               return;
+
+       rpc_call_start(task);
+}
+
+static void filelayout_write_call_done(struct rpc_task *task, void *data)
+{
+       struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+       /* Note this may cause RPC to be resent */
+       wdata->mds_ops->rpc_call_done(task, data);
+}
+
+static void filelayout_write_release(void *data)
+{
+       struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+       wdata->mds_ops->rpc_release(data);
+}
+
 struct rpc_call_ops filelayout_read_call_ops = {
        .rpc_call_prepare = filelayout_read_prepare,
        .rpc_call_done = filelayout_read_call_done,
        .rpc_release = filelayout_read_release,
 };
 
+struct rpc_call_ops filelayout_write_call_ops = {
+       .rpc_call_prepare = filelayout_write_prepare,
+       .rpc_call_done = filelayout_write_call_done,
+       .rpc_release = filelayout_write_release,
+};
+
 static enum pnfs_try_status
 filelayout_read_pagelist(struct nfs_read_data *data)
 {
@@ -238,10 +295,52 @@ filelayout_read_pagelist(struct nfs_read_data *data)
        return PNFS_ATTEMPTED;
 }
 
+/* Perform async writes. */
 static enum pnfs_try_status
 filelayout_write_pagelist(struct nfs_write_data *data, int sync)
 {
-       return PNFS_NOT_ATTEMPTED;
+       struct pnfs_layout_segment *lseg = data->lseg;
+       struct nfs4_pnfs_ds *ds;
+       loff_t offset = data->args.offset;
+       u32 j, idx;
+       struct nfs_fh *fh;
+       int status;
+
+       /* Retrieve the correct rpc_client for the byte range */
+       j = nfs4_fl_calc_j_index(lseg, offset);
+       idx = nfs4_fl_calc_ds_index(lseg, j);
+       ds = nfs4_fl_prepare_ds(lseg, idx);
+       if (!ds) {
+               printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
+               set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
+               set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
+               return PNFS_NOT_ATTEMPTED;
+       }
+       dprintk("%s ino %lu sync %d req %Zu@%llu DS:%x:%hu\n", __func__,
+               data->inode->i_ino, sync, (size_t) data->args.count, offset,
+               ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
+
+       /* We can't handle commit to ds yet */
+       if (!FILELAYOUT_LSEG(lseg)->commit_through_mds)
+               data->args.stable = NFS_FILE_SYNC;
+
+       data->write_done_cb = filelayout_write_done_cb;
+       data->ds_clp = ds->ds_clp;
+       fh = nfs4_fl_select_ds_fh(lseg, j);
+       if (fh)
+               data->args.fh = fh;
+       /*
+        * Get the file offset on the dserver. Set the write offset to
+        * this offset and save the original offset.
+        */
+       data->args.offset = filelayout_get_dserver_offset(lseg, offset);
+       data->mds_offset = offset;
+
+       /* Perform an asynchronous write */
+       status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
+                                   &filelayout_write_call_ops, sync);
+       BUG_ON(status != 0);
+       return PNFS_ATTEMPTED;
 }
 
 /*