NFS: Added TEST_STATEID call

This patch adds in the xdr for doing a TEST_STATEID call with a single
stateid. RFC 5661 allows multiple stateids to be tested in a single
call, but only testing one keeps things simpler for now.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index c8c069a6319b..7d914d9e7584 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -345,6 +345,9 @@ static int nfs4_stat_to_errno(int);
                                 1 + decode_stateid_maxsz)
 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
+#define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
+                                         XDR_QUADLEN(NFS4_STATEID_SIZE))
+#define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
 #else /* CONFIG_NFS_V4_1 */
 #define encode_sequence_maxsz   0
 #define decode_sequence_maxsz   0
@@ -782,6 +785,12 @@ static int nfs4_stat_to_errno(int);
                                         decode_sequence_maxsz + \
                                         decode_putrootfh_maxsz + \
                                         decode_secinfo_no_name_maxsz)
+#define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
+                                         encode_sequence_maxsz + \
+                                         encode_test_stateid_maxsz)
+#define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
+                                         decode_sequence_maxsz + \
+                                         decode_test_stateid_maxsz)
 
 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
                                       compound_encode_hdr_maxsz +
@@ -1962,6 +1971,20 @@ encode_secinfo_no_name(struct xdr_stream *xdr,
         hdr->replen += decode_secinfo_no_name_maxsz;
         return 0;
 }
+
+static void encode_test_stateid(struct xdr_stream *xdr,
+                                struct nfs41_test_stateid_args *args,
+                                struct compound_hdr *hdr)
+{
+        __be32 *p;
+
+        p = reserve_space(xdr, 8 + NFS4_STATEID_SIZE);
+        *p++ = cpu_to_be32(OP_TEST_STATEID);
+        *p++ = cpu_to_be32(1);
+        xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
+        hdr->nops++;
+        hdr->replen += decode_test_stateid_maxsz;
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 /*
@@ -2833,6 +2856,23 @@ static int nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
         encode_nops(&hdr);
         return 0;
 }
+
+/*
+ *  Encode TEST_STATEID request
+ */
+static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
+                                      struct xdr_stream *xdr,
+                                      struct nfs41_test_stateid_args *args)
+{
+        struct compound_hdr hdr = {
+                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
+        };
+
+        encode_compound_hdr(xdr, req, &hdr);
+        encode_sequence(xdr, &args->seq_args, &hdr);
+        encode_test_stateid(xdr, args, &hdr);
+        encode_nops(&hdr);
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
@@ -5371,6 +5411,35 @@ out_overflow:
         print_overflow_msg(__func__, xdr);
         return -EIO;
 }
+
+static int decode_test_stateid(struct xdr_stream *xdr,
+                               struct nfs41_test_stateid_res *res)
+{
+        __be32 *p;
+        int status;
+        int num_res;
+
+        status = decode_op_hdr(xdr, OP_TEST_STATEID);
+        if (status)
+                return status;
+
+        p = xdr_inline_decode(xdr, 4);
+        if (unlikely(!p))
+                goto out_overflow;
+        num_res = be32_to_cpup(p++);
+        if (num_res != 1)
+                goto out;
+
+        p = xdr_inline_decode(xdr, 4);
+        if (unlikely(!p))
+                goto out_overflow;
+        res->status = be32_to_cpup(p++);
+        return res->status;
+out_overflow:
+        print_overflow_msg(__func__, xdr);
+out:
+        return -EIO;
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 /*
@@ -6534,6 +6603,27 @@ static int nfs4_xdr_dec_secinfo_no_name(struct rpc_rqst *rqstp,
 out:
         return status;
 }
+
+/*
+ * Decode TEST_STATEID response
+ */
+static int nfs4_xdr_dec_test_stateid(struct rpc_rqst *rqstp,
+                                     struct xdr_stream *xdr,
+                                     struct nfs41_test_stateid_res *res)
+{
+        struct compound_hdr hdr;
+        int status;
+
+        status = decode_compound_hdr(xdr, &hdr);
+        if (status)
+                goto out;
+        status = decode_sequence(xdr, &res->seq_res, rqstp);
+        if (status)
+                goto out;
+        status = decode_test_stateid(xdr, res);
+out:
+        return status;
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 /**
@@ -6737,6 +6827,7 @@ struct rpc_procinfo	nfs4_procedures[] = {
         PROC(LAYOUTCOMMIT,      enc_layoutcommit,       dec_layoutcommit),
         PROC(LAYOUTRETURN,      enc_layoutreturn,       dec_layoutreturn),
         PROC(SECINFO_NO_NAME,   enc_secinfo_no_name,    dec_secinfo_no_name),
+        PROC(TEST_STATEID,      enc_test_stateid,       dec_test_stateid),
 #endif /* CONFIG_NFS_V4_1 */
 };