NFSv4.1: implement generic pnfs layer write switch

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Mike Sager <sager@netapp.com>
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 5f205d31d96c..f38813a0a295 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -895,6 +895,30 @@ pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode)
         pgio->pg_test = (ld && ld->pg_test) ? pnfs_write_pg_test : NULL;
 }
 
+enum pnfs_try_status
+pnfs_try_to_write_data(struct nfs_write_data *wdata,
+                        const struct rpc_call_ops *call_ops, int how)
+{
+        struct inode *inode = wdata->inode;
+        enum pnfs_try_status trypnfs;
+        struct nfs_server *nfss = NFS_SERVER(inode);
+
+        wdata->mds_ops = call_ops;
+
+        dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
+                inode->i_ino, wdata->args.count, wdata->args.offset, how);
+
+        trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
+        if (trypnfs == PNFS_NOT_ATTEMPTED) {
+                put_lseg(wdata->lseg);
+                wdata->lseg = NULL;
+        } else
+                nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
+
+        dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
+        return trypnfs;
+}
+
 /*
  * Call the appropriate parallel I/O subsystem read function.
  */