From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Sat, 19 Nov 2016 13:48:47 +0000 (-0500)
Subject: pNFS: Prevent unnecessary layoutreturns after delegreturn
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=53e6fc86abbbd7338f16267846a58de7ee24e839;p=linux-beck.git

pNFS: Prevent unnecessary layoutreturns after delegreturn

If we cannot grab the inode or superblock, then we cannot pin the
layout header, and so we cannot send a layoutreturn as part of an
async delegreturn call. In this case, we currently end up sending
an extra layoutreturn after the delegreturn. Since the layout was
implicitly returned by the delegreturn, that just gets a BAD_STATEID.

The fix is to simply complete the return-on-close immediately.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 221d97de0e2c..5593b088c561 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5744,14 +5744,16 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
 	nfs_fattr_init(data->res.fattr);
 	data->timestamp = jiffies;
 	data->rpc_status = 0;
+	data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
 	data->inode = nfs_igrab_and_active(inode);
 	if (data->inode) {
-		data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
-				cred);
 		if (data->lr.roc) {
 			data->args.lr_args = &data->lr.arg;
 			data->res.lr_res = &data->lr.res;
 		}
+	} else if (data->lr.roc) {
+		pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
+		data->lr.roc = false;
 	}
 
 	task_setup_data.callback_data = data;