From: The pNFS Team <linux-nfs@xxxxxxxxxxxxxxx>
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
---
fs/nfs/nfs4filelayout.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index c9251ca..8c5702b 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -151,12 +151,41 @@ static void filelayout_read_release(void *data)
rdata->pdata.call_ops->rpc_release(data);
}
+static void filelayout_write_call_done(struct rpc_task *task, void *data)
+{
+ struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+ if (wdata->fldata.orig_offset) {
+ dprintk("%s new off %llu orig offset %llu\n", __func__,
+ wdata->args.offset, wdata->fldata.orig_offset);
+ wdata->args.offset = wdata->fldata.orig_offset;
+ }
+
+ /* Note this may cause RPC to be resent */
+ wdata->pdata.call_ops->rpc_call_done(task, data);
+}
+
+static void filelayout_write_release(void *data)
+{
+ struct nfs_write_data *wdata = (struct nfs_write_data *)data;
+
+ put_lseg(wdata->pdata.lseg);
+ wdata->pdata.lseg = NULL;
+ wdata->pdata.call_ops->rpc_release(data);
+}
+
struct rpc_call_ops filelayout_read_call_ops = {
.rpc_call_prepare = nfs_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 = nfs_write_prepare,
+ .rpc_call_done = filelayout_write_call_done,
+ .rpc_release = filelayout_write_release,
+};
+
/* Perform sync or async reads.
*
* An optimization for the NFS file layout driver
@@ -210,6 +239,47 @@ filelayout_read_pagelist(struct nfs_read_data *data, unsigned nr_pages)
return PNFS_ATTEMPTED;
}
+/* Perform async writes. */
+static enum pnfs_try_status
+filelayout_write_pagelist(struct nfs_write_data *data, unsigned nr_pages, int sync)
+{
+ struct pnfs_layout_segment *lseg = data->pdata.lseg;
+ struct nfs4_pnfs_ds *ds;
+ loff_t offset = data->args.offset;
+ u32 idx;
+ struct nfs_fh *fh;
+
+ /* Retrieve the correct rpc_client for the byte range */
+ idx = nfs4_fl_calc_ds_index(lseg, offset);
+ ds = nfs4_fl_prepare_ds(lseg, idx);
+ if (!ds) {
+ printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
+ return PNFS_NOT_ATTEMPTED;
+ }
+ dprintk("%s ino %lu sync %d req %Zu@%llu DS:%x:%hu %s\n", __func__,
+ data->inode->i_ino, sync, (size_t) data->args.count, offset,
+ htonl(ds->ds_ip_addr), ntohs(ds->ds_port), ds->r_addr);
+
+ data->fldata.ds_nfs_client = ds->ds_clp;
+ fh = nfs4_fl_select_ds_fh(lseg, offset);
+ 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->fldata.orig_offset = offset;
+
+ /*
+ * Perform an asynchronous write The offset will be reset in the
+ * call_ops->rpc_call_done() routine
+ */
+ nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
+ &filelayout_write_call_ops, sync);
+ return PNFS_ATTEMPTED;
+}
+
/*
* Create a filelayout layout structure and return it. The pNFS client
* will use the pnfs_layout_type type to refer to the layout for this
@@ -465,6 +535,7 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct layoutdriver_io_operations filelayout_io_operations = {
.read_pagelist = filelayout_read_pagelist,
+ .write_pagelist = filelayout_write_pagelist,
.alloc_layout = filelayout_alloc_layout,
.free_layout = filelayout_free_layout,
.alloc_lseg = filelayout_alloc_lseg,
--
1.6.2.5
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