[PATCH pnfs-submit-wave3 update 3/5] wave3: document that we are relying on nfs_initiate_read not failing

[andros@netapp.com]

From: Fred Isaman <iisaman@netapp.com>

With the curent code, rpc_run_task(), and thus nfs_initiate_read(),
can not fail if the task is pre-initialized.  Trond asked that
we document this in case of future code changes with a BUG_ON.

Signed-off-by: Fred Isaman <iisaman@netapp.com>
---
 fs/nfs/nfs4filelayout.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 45b650a..e76c582 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -203,6 +203,7 @@ filelayout_read_pagelist(struct nfs_read_data *data)
 	loff_t offset = data->args.offset;
 	u32 j, idx;
 	struct nfs_fh *fh;
+	int status;
 
 	dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
 		__func__, data->inode->i_ino,
@@ -231,8 +232,9 @@ filelayout_read_pagelist(struct nfs_read_data *data)
 	data->mds_offset = offset;
 
 	/* Perform an asynchronous read to ds */
-	nfs_initiate_read(data, ds->ds_clp->cl_rpcclient,
-			  &filelayout_read_call_ops);
+	status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient,
+				   &filelayout_read_call_ops);
+	BUG_ON(status != 0);
 	return PNFS_ATTEMPTED;
 }
 
-- 
1.6.2.5