From 7380020e77b61361207420e78a9da925bc79ab4b Mon Sep 17 00:00:00 2001
From: Trond Myklebust
Date: Mon, 6 Nov 2017 15:28:07 -0500
Subject: pNFS: Retry NFS4ERR_OLD_STATEID errors in layoutreturn-on-close

If our layoutreturn on close operation returns an NFS4ERR_OLD_STATEID,
then try to update the stateid and retry. We know that there should
be no further LAYOUTGET requests being launched.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
 fs/nfs/nfs4proc.c | 18 ++++++++++++++++--
 fs/nfs/pnfs.c     | 18 ++++++++++++++++++
 fs/nfs/pnfs.h     |  6 ++++++
 3 files changed, 40 insertions(+), 2 deletions(-)

(limited to 'fs')

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ef313d602a85..7ff9c43f79eb 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3166,11 +3166,18 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
 			calldata->arg.lr_args = NULL;
 			calldata->res.lr_res = NULL;
 			break;
+		case -NFS4ERR_OLD_STATEID:
+			if (nfs4_refresh_layout_stateid(&calldata->arg.lr_args->stateid,
+						calldata->inode)) {
+				calldata->res.lr_ret = 0;
+				rpc_restart_call_prepare(task);
+				return;
+			}
+			/* Fallthrough */
 		case -NFS4ERR_ADMIN_REVOKED:
 		case -NFS4ERR_DELEG_REVOKED:
 		case -NFS4ERR_EXPIRED:
 		case -NFS4ERR_BAD_STATEID:
-		case -NFS4ERR_OLD_STATEID:
 		case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
 		case -NFS4ERR_WRONG_CRED:
 			calldata->arg.lr_args = NULL;
@@ -5771,11 +5778,18 @@ static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
 			data->args.lr_args = NULL;
 			data->res.lr_res = NULL;
 			break;
+		case -NFS4ERR_OLD_STATEID:
+			if (nfs4_refresh_layout_stateid(&data->args.lr_args->stateid,
+						data->inode)) {
+				data->res.lr_ret = 0;
+				rpc_restart_call_prepare(task);
+				return;
+			}
+			/* Fallthrough */
 		case -NFS4ERR_ADMIN_REVOKED:
 		case -NFS4ERR_DELEG_REVOKED:
 		case -NFS4ERR_EXPIRED:
 		case -NFS4ERR_BAD_STATEID:
-		case -NFS4ERR_OLD_STATEID:
 		case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
 		case -NFS4ERR_WRONG_CRED:
 			data->args.lr_args = NULL;
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index ec30dacf1a24..d602fe9e1ac8 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -354,6 +354,24 @@ pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
 		pnfs_lseg_dec_and_remove_zero(lseg, free_me);
 }
 
+/*
+ * Update the seqid of a layout stateid
+ */
+bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, struct inode *inode)
+{
+	struct pnfs_layout_hdr *lo;
+	bool ret = false;
+
+	spin_lock(&inode->i_lock);
+	lo = NFS_I(inode)->layout;
+	if (lo && nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
+		dst->seqid = lo->plh_stateid.seqid;
+		ret = true;
+	}
+	spin_unlock(&inode->i_lock);
+	return ret;
+}
+
 /*
  * Mark a pnfs_layout_hdr and all associated layout segments as invalid
  *
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 78de7a2052f7..8d507c361d98 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -252,6 +252,7 @@ int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 		bool is_recall);
 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 		bool is_recall);
+bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, struct inode *inode);
 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 			     const nfs4_stateid *new,
@@ -765,6 +766,11 @@ static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 {
 }
 
+static inline bool nfs4_refresh_layout_stateid(nfs4_stateid *dst,
+		struct inode *inode)
+{
+	return false;
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 #if IS_ENABLED(CONFIG_NFS_V4_2)
-- 
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