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From:   Steve Dickson <steved@redhat.com>
To:     Linux NFS Mailing list <linux-nfs@vger.kernel.org>
Subject: [PATCH 1/1] nfsd4_copy: Adds the ability to do inter server to server on an export
Date:   Thu, 28 Oct 2021 10:48:51 -0400
Message-Id: <20211028144851.644018-2-steved@redhat.com>
In-Reply-To: <20211028144851.644018-1-steved@redhat.com>
References: <20211028144851.644018-1-steved@redhat.com>
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This adds the 's2sc' export option allowing inter server
to server copies on the destination server.

Signed-off-by: Steve Dickson <steved@redhat.com>
---
 fs/nfsd/nfs4proc.c               | 3 ++-
 include/uapi/linux/nfsd/export.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 486c5dba4b65..df3ca5f7f86f 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1654,9 +1654,10 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	struct nfsd4_copy *copy = &u->copy;
 	__be32 status;
 	struct nfsd4_copy *async_copy = NULL;
+	int s2sc = (cstate->current_fh.fh_export->ex_flags & NFSEXP_S2SC);
 
 	if (!copy->cp_intra) { /* Inter server SSC */
-		if (!inter_copy_offload_enable || copy->cp_synchronous) {
+		if (s2sc == 0 && (!inter_copy_offload_enable || copy->cp_synchronous)) {
 			status = nfserr_notsupp;
 			goto out;
 		}
diff --git a/include/uapi/linux/nfsd/export.h b/include/uapi/linux/nfsd/export.h
index 2124ba904779..53ba8d989689 100644
--- a/include/uapi/linux/nfsd/export.h
+++ b/include/uapi/linux/nfsd/export.h
@@ -53,6 +53,7 @@
  */
 #define	NFSEXP_V4ROOT		0x10000
 #define NFSEXP_PNFS		0x20000
+#define NFSEXP_S2SC		0x40000
 
 /* All flags that we claim to support.  (Note we don't support NOACL.) */
 #define NFSEXP_ALLFLAGS		0x3FEFF
-- 
2.31.1