nfs: machine credential support for additional operations

Allow LAYOUTRETURN and DELEGRETURN to use machine credentials if the
server supports it. Add request for OPEN_DOWNGRADE as the close path
also uses that.
Signed-off-by: Andrew Elble <aweits@rit.edu>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/nfs4proc.c

@@ -5383,6 +5383,11 @@ static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, co
 	if (data == NULL)
 		return -ENOMEM;
 	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
+
+	nfs4_state_protect(server->nfs_client,
+			NFS_SP4_MACH_CRED_CLEANUP,
+			&task_setup_data.rpc_client, &msg);
+
 	data->args.fhandle = &data->fh;
 	data->args.stateid = &data->stateid;
 	data->args.bitmask = server->cache_consistency_bitmask;
@@ -6859,10 +6864,13 @@ static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
 	},
 	.allow.u.words = {
 		[0] = 1 << (OP_CLOSE) |
+		      1 << (OP_OPEN_DOWNGRADE) |
 		      1 << (OP_LOCKU) |
+		      1 << (OP_DELEGRETURN) |
 		      1 << (OP_COMMIT),
 		[1] = 1 << (OP_SECINFO - 32) |
 		      1 << (OP_SECINFO_NO_NAME - 32) |
+		      1 << (OP_LAYOUTRETURN - 32) |
 		      1 << (OP_TEST_STATEID - 32) |
 		      1 << (OP_FREE_STATEID - 32) |
 		      1 << (OP_WRITE - 32)
@@ -6927,11 +6935,19 @@ static int nfs4_sp4_select_mode(struct nfs_client *clp,
 		}
 
 		if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
+		    test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
+		    test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
 		    test_bit(OP_LOCKU, sp->allow.u.longs)) {
 			dfprintk(MOUNT, "  cleanup mode enabled\n");
 			set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
 		}
 
+		if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
+			dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
+			set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
+				&clp->cl_sp4_flags);
+		}
+
 		if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
 		    test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
 			dfprintk(MOUNT, "  secinfo mode enabled\n");
@@ -8084,6 +8100,10 @@ int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
 	};
 	int status = 0;
 
+	nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
+			NFS_SP4_MACH_CRED_PNFS_CLEANUP,
+			&task_setup_data.rpc_client, &msg);
+
 	dprintk("--> %s\n", __func__);
 	if (!sync) {
 		lrp->inode = nfs_igrab_and_active(lrp->args.inode);

include/linux/nfs_fs_sb.h

@@ -102,6 +102,7 @@ struct nfs_client {
 #define NFS_SP4_MACH_CRED_STATEID  4	/* TEST_STATEID and FREE_STATEID */
 #define NFS_SP4_MACH_CRED_WRITE    5	/* WRITE */
 #define NFS_SP4_MACH_CRED_COMMIT   6	/* COMMIT */
+#define NFS_SP4_MACH_CRED_PNFS_CLEANUP  7 /* LAYOUTRETURN */
 #endif /* CONFIG_NFS_V4 */
 
 	/* Our own IP address, as a null-terminated string.