nfs4: add NFSv4 LOOKUPP handlers

This will be needed in order to implement the get_parent export op
for nfsd.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 495d493d3a35..fa3eb361d4f8 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -159,6 +159,8 @@ static int nfs4_stat_to_errno(int);
                                 (op_decode_hdr_maxsz)
 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
+#define encode_lookupp_maxsz    (op_encode_hdr_maxsz)
+#define decode_lookupp_maxsz    (op_decode_hdr_maxsz)
 #define encode_share_access_maxsz \
                                 (2)
 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
@@ -618,6 +620,18 @@ static int nfs4_stat_to_errno(int);
                                 decode_lookup_maxsz + \
                                 decode_getattr_maxsz + \
                                 decode_getfh_maxsz)
+#define NFS4_enc_lookupp_sz     (compound_encode_hdr_maxsz + \
+                                encode_sequence_maxsz + \
+                                encode_putfh_maxsz + \
+                                encode_lookupp_maxsz + \
+                                encode_getattr_maxsz + \
+                                encode_getfh_maxsz)
+#define NFS4_dec_lookupp_sz     (compound_decode_hdr_maxsz + \
+                                decode_sequence_maxsz + \
+                                decode_putfh_maxsz + \
+                                decode_lookupp_maxsz + \
+                                decode_getattr_maxsz + \
+                                decode_getfh_maxsz)
 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putrootfh_maxsz + \
@@ -1368,6 +1382,11 @@ static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struc
         encode_string(xdr, name->len, name->name);
 }
 
+static void encode_lookupp(struct xdr_stream *xdr, struct compound_hdr *hdr)
+{
+        encode_op_hdr(xdr, OP_LOOKUPP, decode_lookupp_maxsz, hdr);
+}
+
 static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
 {
         __be32 *p;
@@ -2123,6 +2142,26 @@ static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
 }
 
 /*
+ * Encode LOOKUPP request
+ */
+static void nfs4_xdr_enc_lookupp(struct rpc_rqst *req, struct xdr_stream *xdr,
+                const void *data)
+{
+        const struct nfs4_lookupp_arg *args = data;
+        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_putfh(xdr, args->fh, &hdr);
+        encode_lookupp(xdr, &hdr);
+        encode_getfh(xdr, &hdr);
+        encode_getfattr(xdr, args->bitmask, &hdr);
+        encode_nops(&hdr);
+}
+
+/*
  * Encode LOOKUP_ROOT request
  */
 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
@@ -5058,6 +5097,11 @@ static int decode_lookup(struct xdr_stream *xdr)
         return decode_op_hdr(xdr, OP_LOOKUP);
 }
 
+static int decode_lookupp(struct xdr_stream *xdr)
+{
+        return decode_op_hdr(xdr, OP_LOOKUPP);
+}
+
 /* This is too sick! */
 static int decode_space_limit(struct xdr_stream *xdr,
                 unsigned long *pagemod_limit)
@@ -6238,6 +6282,36 @@ out:
 }
 
 /*
+ * Decode LOOKUPP response
+ */
+static int nfs4_xdr_dec_lookupp(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
+                void *data)
+{
+        struct nfs4_lookupp_res *res = data;
+        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_putfh(xdr);
+        if (status)
+                goto out;
+        status = decode_lookupp(xdr);
+        if (status)
+                goto out;
+        status = decode_getfh(xdr, res->fh);
+        if (status)
+                goto out;
+        status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
+out:
+        return status;
+}
+
+/*
  * Decode LOOKUP_ROOT response
  */
 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
@@ -7614,6 +7688,7 @@ const struct rpc_procinfo nfs4_procedures[] = {
         PROC(ACCESS,            enc_access,             dec_access),
         PROC(GETATTR,           enc_getattr,            dec_getattr),
         PROC(LOOKUP,            enc_lookup,             dec_lookup),
+        PROC(LOOKUPP,           enc_lookupp,            dec_lookupp),
         PROC(LOOKUP_ROOT,       enc_lookup_root,        dec_lookup_root),
         PROC(REMOVE,            enc_remove,             dec_remove),
         PROC(RENAME,            enc_rename,             dec_rename),