commit 6e01260ceeca299b82d466660935534c5c909d54
author Fred Isaman <fred.isaman@gmail.com> Tue Oct 04 15:26:41 2016 -0400
committer Trond Myklebust <trond.myklebust@hammerspace.com> Thu May 31 15:03:11 2018 -0400
tree 16852b84a1595fbb2bd4b64cbdc085d3b91cd16c
parent 78746a384c88c6405594cd07cae11b3b3caffb9b

pnfs: Stop attempting LAYOUTGET on OPEN on failure

Signed-off-by: Fred Isaman <fred.isaman@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs4proc.c

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 0e6db19..05454cb 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -9465,7 +9465,8 @@ static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
 		| NFS_CAP_ATOMIC_OPEN
 		| NFS_CAP_POSIX_LOCK
 		| NFS_CAP_STATEID_NFSV41
-		| NFS_CAP_ATOMIC_OPEN_V1,
+		| NFS_CAP_ATOMIC_OPEN_V1
+		| NFS_CAP_LGOPEN,
 	.init_client = nfs41_init_client,
 	.shutdown_client = nfs41_shutdown_client,
 	.match_stateid = nfs41_match_stateid,
@@ -9490,6 +9491,7 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
 		| NFS_CAP_POSIX_LOCK
 		| NFS_CAP_STATEID_NFSV41
 		| NFS_CAP_ATOMIC_OPEN_V1
+		| NFS_CAP_LGOPEN
 		| NFS_CAP_ALLOCATE
 		| NFS_CAP_COPY
 		| NFS_CAP_DEALLOCATE

fs/nfs/pnfs.c

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index a6fe813..3dfe9fa 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2088,6 +2088,8 @@ void pnfs_lgopen_prepare(struct nfs4_opendata *data,
 	      server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
 		return;
 	/* Could check on max_ops, but currently hardcoded high enough */
+	if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
+		return;
 	if (data->state)
 		_lgopen_prepare_attached(data, ctx);
 	else
@@ -2101,8 +2103,23 @@ void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
 	struct pnfs_layout_segment *lseg;
 	u32 iomode;
 
-	if (!lgp || lgp->res.layoutp->len == 0)
+	if (!lgp)
 		return;
+	dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
+	if (lgp->res.status) {
+		switch (lgp->res.status) {
+		case -NFS4ERR_DELAY:
+		case -NFS4ERR_GRACE:
+		case -NFS4ERR_LAYOUTTRYLATER:
+			break;
+		default:
+			/* FIXME - Any error not listed above permanently
+			 * halts lgopen attempts.
+			 */
+			NFS_SERVER(ino)->caps &= ~NFS_CAP_LGOPEN;
+		}
+		return;
+	}
 	if (!lgp->args.inode) {
 		lo = _pnfs_grab_empty_layout(ino, ctx);
 		if (!lo)