[PATCH 1/1] exportfs: Add the 's2sc' option allowing inter server to server copies

[Steve Dickson <steved@redhat.com>]

The new export will enable inter server to server
copies on that particular export on the destination
server

Signed-off-by: Steve Dickson <steved@redhat.com>
---
 support/include/nfs/export.h |  1 +
 support/nfs/exports.c        |  5 +++++
 utils/exportfs/exportfs.c    |  2 ++
 utils/exportfs/exports.man   | 14 ++++++++++++++
 4 files changed, 22 insertions(+)

diff --git a/support/include/nfs/export.h b/support/include/nfs/export.h
index 0eca828e..e563e7aa 100644
--- a/support/include/nfs/export.h
+++ b/support/include/nfs/export.h
@@ -28,6 +28,7 @@
 #define NFSEXP_NOACL		0x8000 /* reserved for possible ACL related use */
 #define NFSEXP_V4ROOT		0x10000
 #define NFSEXP_PNFS            0x20000
+#define NFSEXP_S2SC            0x40000
 /*
  * All flags supported by the kernel before addition of the
  * export_features interface:
diff --git a/support/nfs/exports.c b/support/nfs/exports.c
index 2c8f0752..7abc3e09 100644
--- a/support/nfs/exports.c
+++ b/support/nfs/exports.c
@@ -297,6 +297,7 @@ putexportent(struct exportent *ep)
 	if (ep->e_flags & NFSEXP_SECURITY_LABEL)
 		fprintf(fp, "security_label,");
 	fprintf(fp, "%spnfs,", (ep->e_flags & NFSEXP_PNFS)? "" : "no_");
+	fprintf(fp, "%ss2sc,", (ep->e_flags & NFSEXP_S2SC)? "" : "no_");
 	if (ep->e_flags & NFSEXP_FSID) {
 		fprintf(fp, "fsid=%d,", ep->e_fsid);
 	}
@@ -616,6 +617,10 @@ parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
 			setflags(NFSEXP_PNFS, active, ep);
 		else if (!strcmp(opt, "no_pnfs"))
 			clearflags(NFSEXP_PNFS, active, ep);
+		else if (!strcmp(opt, "s2sc"))
+			setflags(NFSEXP_S2SC, active, ep);
+		else if (!strcmp(opt, "no_s2sc"))
+			clearflags(NFSEXP_S2SC, active, ep);
 		else if (strncmp(opt, "anonuid=", 8) == 0) {
 			char *oe;
 			ep->e_anonuid = strtol(opt+8, &oe, 10);
diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
index 6ba615d1..1180d2e7 100644
--- a/utils/exportfs/exportfs.c
+++ b/utils/exportfs/exportfs.c
@@ -715,6 +715,8 @@ dump(int verbose, int export_format)
 				c = dumpopt(c, "no_acl");
 			if (ep->e_flags & NFSEXP_PNFS)
 				c = dumpopt(c, "pnfs");
+			if (ep->e_flags & NFSEXP_S2SC)
+				c = dumpopt(c, "s2sc");
 			if (ep->e_flags & NFSEXP_FSID)
 				c = dumpopt(c, "fsid=%d", ep->e_fsid);
 			if (ep->e_uuid)
diff --git a/utils/exportfs/exports.man b/utils/exportfs/exports.man
index 54b3f877..6c54d8a7 100644
--- a/utils/exportfs/exports.man
+++ b/utils/exportfs/exports.man
@@ -420,6 +420,20 @@ will only work if all clients use a consistent security policy.  Note
 that early kernels did not support this export option, and instead
 enabled security labels by default.
 
+.TP
+.IR s2sc
+This option enables inter server to server 
+copy on the export. The client will initiate
+the file copy with source server. The client
+will initiate the copy with destination server.
+This option will allow that initiation to be
+successful, allowing the copy to occur between
+the servers.
+
+This type of copy can be enable system-wide
+by enabling the inter_copy_offload_enable
+parameter.
+
 .SS User ID Mapping
 .PP
 .B nfsd
-- 
2.31.1