nfsd: trivial GET_DIR_DELEGATION support

This adds basic infrastructure for handing GET_DIR_DELEGATION calls from
clients, including the decoders and encoders. For now, it always just
returns NFS4_OK + GDD4_UNAVAIL.

Eventually clients may start sending this operation, and it's better if
we can return GDD4_UNAVAIL instead of having to abort the whole compound.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 415516c1b27e..446e72b0385e 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -518,6 +518,24 @@ struct nfsd4_free_stateid {
 	stateid_t	fr_stateid;         /* request */
 };
 
+struct nfsd4_get_dir_delegation {
+	/* request */
+	u32			gdda_signal_deleg_avail;
+	u32			gdda_notification_types[1];
+	struct timespec64	gdda_child_attr_delay;
+	struct timespec64	gdda_dir_attr_delay;
+	u32			gdda_child_attributes[3];
+	u32			gdda_dir_attributes[3];
+	/* response */
+	u32			gddrnf_status;
+	nfs4_verifier		gddr_cookieverf;
+	stateid_t		gddr_stateid;
+	u32			gddr_notification[1];
+	u32			gddr_child_attributes[3];
+	u32			gddr_dir_attributes[3];
+	bool			gddrnf_will_signal_deleg_avail;
+};
+
 /* also used for NVERIFY */
 struct nfsd4_verify {
 	u32		ve_bmval[3];        /* request */
@@ -797,6 +815,7 @@ struct nfsd4_op {
 		struct nfsd4_reclaim_complete	reclaim_complete;
 		struct nfsd4_test_stateid	test_stateid;
 		struct nfsd4_free_stateid	free_stateid;
+		struct nfsd4_get_dir_delegation	get_dir_delegation;
 		struct nfsd4_getdeviceinfo	getdeviceinfo;
 		struct nfsd4_layoutget		layoutget;
 		struct nfsd4_layoutcommit	layoutcommit;