NFSv4.1: pnfs filelayout driver write

Allows the pnfs filelayout driver to write to the data servers.

Note that COMMIT to data servers will be implemented in a future
patch.  To avoid improper behavior, for the moment any WRITE to a data
server that would also require a COMMIT to the data server is sent
NFS_FILE_SYNC.

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Mingyang Guo <guomingyang@nrchpc.ac.cn>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
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, 4 insertions, 1 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index df99c5b0ee65..ee62ddf60e7a 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -783,7 +783,7 @@ static int flush_task_priority(int how)
         return RPC_PRIORITY_NORMAL;
 }
 
-static int nfs_initiate_write(struct nfs_write_data *data,
+int nfs_initiate_write(struct nfs_write_data *data,
                        struct rpc_clnt *clnt,
                        const struct rpc_call_ops *call_ops,
                        int how)
@@ -833,6 +833,7 @@ static int nfs_initiate_write(struct nfs_write_data *data,
 out:
         return ret;
 }
+EXPORT_SYMBOL_GPL(nfs_initiate_write);
 
 /*
  * Set up the argument/result storage required for the RPC call.
@@ -1194,6 +1195,7 @@ void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
                  */
                 static unsigned long    complain;
 
+                /* Note this will print the MDS for a DS write */
                 if (time_before(complain, jiffies)) {
                         dprintk("NFS:       faulty NFS server %s:"
                                 " (committed = %d) != (stable = %d)\n",
@@ -1214,6 +1216,7 @@ void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
                         /* Was this an NFSv2 write or an NFSv3 stable write? */
                         if (resp->verf->committed != NFS_UNSTABLE) {
                                 /* Resend from where the server left off */
+                                data->mds_offset += resp->count;
                                 argp->offset += resp->count;
                                 argp->pgbase += resp->count;
                                 argp->count -= resp->count;