NFSv4: Add new attribute delegation definitions

Add the attribute delegation XDR definitions from the spec.
Signed-off-by: Tom Haynes <loghyr@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Lance Shelton <lance.shelton@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/nfs4proc.c

@@ -3852,7 +3852,7 @@ static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
 
 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
-#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
+#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_TIME_DELEG_MODIFY - 1UL)
 
 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
 {

include/linux/nfs4.h

@@ -367,6 +367,8 @@ enum open_delegation_type4 {
 	NFS4_OPEN_DELEGATE_READ = 1,
 	NFS4_OPEN_DELEGATE_WRITE = 2,
 	NFS4_OPEN_DELEGATE_NONE_EXT = 3, /* 4.1 */
+	NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG = 4,
+	NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG = 5,
 };
 
 enum why_no_delegation4 { /* new to v4.1 */
@@ -507,6 +509,11 @@ enum {
 	FATTR4_XATTR_SUPPORT		= 82,
 };
 
+enum {
+	FATTR4_TIME_DELEG_ACCESS	= 84,
+	FATTR4_TIME_DELEG_MODIFY	= 85,
+};
+
 /*
  * The following internal definitions enable processing the above
  * attribute bits within 32-bit word boundaries.
@@ -586,6 +593,8 @@ enum {
 #define FATTR4_WORD2_SECURITY_LABEL     BIT(FATTR4_SEC_LABEL - 64)
 #define FATTR4_WORD2_MODE_UMASK		BIT(FATTR4_MODE_UMASK - 64)
 #define FATTR4_WORD2_XATTR_SUPPORT	BIT(FATTR4_XATTR_SUPPORT - 64)
+#define FATTR4_WORD2_TIME_DELEG_ACCESS	BIT(FATTR4_TIME_DELEG_ACCESS - 64)
+#define FATTR4_WORD2_TIME_DELEG_MODIFY	BIT(FATTR4_TIME_DELEG_MODIFY - 64)
 
 /* MDS threshold bitmap bits */
 #define THRESHOLD_RD                    (1UL << 0)

include/uapi/linux/nfs4.h

@@ -69,6 +69,8 @@
 #define NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL	0x10000
 #define NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED		0x20000
 
+#define NFS4_SHARE_WANT_DELEG_TIMESTAMPS		0x100000
+
 #define NFS4_CDFC4_FORE	0x1
 #define NFS4_CDFC4_BACK 0x2
 #define NFS4_CDFC4_BOTH 0x3