nfs41: add a helper function to set layoutcommit after commit

Track lwb in nfs_commit_data so that we can use it to setup
layoutcommit in commit_done callback.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 175d5d073ccf..3c5638f381cd 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1538,6 +1538,18 @@ int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
 }
 EXPORT_SYMBOL_GPL(nfs_initiate_commit);
 
+static loff_t nfs_get_lwb(struct list_head *head)
+{
+        loff_t lwb = 0;
+        struct nfs_page *req;
+
+        list_for_each_entry(req, head, wb_list)
+                if (lwb < (req_offset(req) + req->wb_bytes))
+                        lwb = req_offset(req) + req->wb_bytes;
+
+        return lwb;
+}
+
 /*
  * Set up the argument/result storage required for the RPC call.
  */
@@ -1557,6 +1569,9 @@ void nfs_init_commit(struct nfs_commit_data *data,
         data->inode       = inode;
         data->cred        = first->wb_context->cred;
         data->lseg        = lseg; /* reference transferred */
+        /* only set lwb for pnfs commit */
+        if (lseg)
+                data->lwb = nfs_get_lwb(&data->pages);
         data->mds_ops     = &nfs_commit_ops;
         data->completion_ops = cinfo->completion_ops;
         data->dreq        = cinfo->dreq;