[PATCH 15/24] nfsd: apply the notify mask to the delegation when requested

[Jeff Layton <jlayton@kernel.org>]

If the client requests a directory delegation with notifications
enabled, set the appropriate return mask in gddr_notification[0]. This
will ensure the lease acquisition sets the appropriate ignore mask.

If the client doesn't set NOTIFY4_GFLAG_EXTEND, then don't offer any
notifications, as nfsd won't provide directory offset information, and
"classic" notifications require them.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfsd/nfs4proc.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 2797da8cc950..01e3bf9e1839 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2506,12 +2506,18 @@ nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	return status == nfserr_same ? nfs_ok : status;
 }
 
+#define SUPPORTED_NOTIFY_MASK	(BIT(NOTIFY4_REMOVE_ENTRY) |	\
+				 BIT(NOTIFY4_ADD_ENTRY) |	\
+				 BIT(NOTIFY4_RENAME_ENTRY) |	\
+				 BIT(NOTIFY4_GFLAG_EXTEND))
+
 static __be32
 nfsd4_get_dir_delegation(struct svc_rqst *rqstp,
 			 struct nfsd4_compound_state *cstate,
 			 union nfsd4_op_u *u)
 {
 	struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
+	u32 requested = gdd->gdda_notification_types[0];
 	struct nfs4_delegation *dd;
 	struct nfsd_file *nf;
 	__be32 status;
@@ -2520,6 +2526,12 @@ nfsd4_get_dir_delegation(struct svc_rqst *rqstp,
 	if (status != nfs_ok)
 		return status;
 
+	/* No notifications if you don't set NOTIFY4_GFLAG_EXTEND! */
+	if (!(requested & BIT(NOTIFY4_GFLAG_EXTEND)))
+		requested = 0;
+
+	gdd->gddr_notification[0] = requested & SUPPORTED_NOTIFY_MASK;
+
 	/*
 	 * RFC 8881, section 18.39.3 says:
 	 *

-- 
2.53.0