@@ -50,11 +50,6 @@ enum {
NFSPROC4_CLNT_CB_SEQUENCE,
};
-enum nfs_cb_opnum4 {
- OP_CB_RECALL = 4,
- OP_CB_SEQUENCE = 11,
-};
-
#define NFS4_MAXTAGLEN 20
#define NFS4_enc_cb_null_sz 0
@@ -80,30 +75,6 @@ enum nfs_cb_opnum4 {
op_dec_sz)
/*
-* Generic encode routines from fs/nfs/nfs4xdr.c
-*/
-static inline __be32 *
-xdr_writemem(__be32 *p, const void *ptr, int nbytes)
-{
- int tmp = XDR_QUADLEN(nbytes);
- if (!tmp)
- return p;
- p[tmp-1] = 0;
- memcpy(p, ptr, nbytes);
- return p + tmp;
-}
-
-#define WRITE32(n) *p++ = htonl(n)
-#define WRITEMEM(ptr,nbytes) do { \
- p = xdr_writemem(p, ptr, nbytes); \
-} while (0)
-#define RESERVE_SPACE(nbytes) do { \
- p = xdr_reserve_space(xdr, nbytes); \
- if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \
- BUG_ON(!p); \
-} while (0)
-
-/*
* Generic decode routines from fs/nfs/nfs4xdr.c
*/
#define DECODE_TAIL \
@@ -197,102 +168,232 @@ nfs_cb_stat_to_errno(int stat)
return stat;
}
+static __be32 *xdr_encode_empty_array(__be32 *p)
+{
+ *p++ = xdr_zero;
+ return p;
+}
+
+/*
+ * Encode/decode NFSv4 CB basic data types
+ *
+ * Basic NFSv4 callback data types are defined in section 15 of RFC
+ * 3530: "Network File System (NFS) version 4 Protocol" and section
+ * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
+ * 1 Protocol"
+ */
+
+/*
+ * nfs_cb_opnum4
+ *
+ * enum nfs_cb_opnum4 {
+ * OP_CB_GETATTR = 3,
+ * ...
+ * };
+ */
+enum nfs_cb_opnum4 {
+ OP_CB_GETATTR = 3,
+ OP_CB_RECALL = 4,
+ OP_CB_LAYOUTRECALL = 5,
+ OP_CB_NOTIFY = 6,
+ OP_CB_PUSH_DELEG = 7,
+ OP_CB_RECALL_ANY = 8,
+ OP_CB_RECALLABLE_OBJ_AVAIL = 9,
+ OP_CB_RECALL_SLOT = 10,
+ OP_CB_SEQUENCE = 11,
+ OP_CB_WANTS_CANCELLED = 12,
+ OP_CB_NOTIFY_LOCK = 13,
+ OP_CB_NOTIFY_DEVICEID = 14,
+ OP_CB_ILLEGAL = 10044
+};
+
+static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, 4);
+ *p = cpu_to_be32(op);
+}
+
+/*
+ * nfs_fh4
+ *
+ * typedef opaque nfs_fh4<NFS4_FHSIZE>;
+ */
+static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
+{
+ u32 length = fh->fh_size;
+ __be32 *p;
+
+ BUG_ON(length > NFS4_FHSIZE);
+ p = xdr_reserve_space(xdr, 4 + length);
+ xdr_encode_opaque(p, &fh->fh_base, length);
+}
+
/*
- * XDR encode
+ * stateid4
+ *
+ * struct stateid4 {
+ * uint32_t seqid;
+ * opaque other[12];
+ * };
*/
+static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
+{
+ __be32 *p;
+
+ p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
+ *p++ = cpu_to_be32(sid->si_generation);
+ xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
+}
-static void
-encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
+/*
+ * sessionid4
+ *
+ * typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
+ */
+static void encode_sessionid4(struct xdr_stream *xdr,
+ const struct nfsd4_session *session)
{
__be32 *p;
- RESERVE_SPACE(sizeof(stateid_t));
- WRITE32(sid->si_generation);
- WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
+ p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
+ xdr_encode_opaque_fixed(p, session->se_sessionid.data,
+ NFS4_MAX_SESSIONID_LEN);
}
-static void
-encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
+/*
+ * CB_COMPOUND4args
+ *
+ * struct CB_COMPOUND4args {
+ * utf8str_cs tag;
+ * uint32_t minorversion;
+ * uint32_t callback_ident;
+ * nfs_cb_argop4 argarray<>;
+ * };
+*/
+static void encode_cb_compound4args(struct xdr_stream *xdr,
+ struct nfs4_cb_compound_hdr *hdr)
{
__be32 * p;
- RESERVE_SPACE(16);
- WRITE32(0); /* tag length is always 0 */
- WRITE32(hdr->minorversion);
- WRITE32(hdr->ident);
+ p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
+ p = xdr_encode_empty_array(p); /* empty tag */
+ *p++ = cpu_to_be32(hdr->minorversion);
+ *p++ = cpu_to_be32(hdr->ident);
+
hdr->nops_p = p;
- WRITE32(hdr->nops);
+ *p = cpu_to_be32(hdr->nops); /* argarray element count */
}
+/*
+ * Update argarray element count
+ */
static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
{
- *hdr->nops_p = htonl(hdr->nops);
+ BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
+ *hdr->nops_p = cpu_to_be32(hdr->nops);
}
-static void
-encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp,
- struct nfs4_cb_compound_hdr *hdr)
+/*
+ * CB_RECALL4args
+ *
+ * struct CB_RECALL4args {
+ * stateid4 stateid;
+ * bool truncate;
+ * nfs_fh4 fh;
+ * };
+ */
+static void encode_cb_recall4args(struct xdr_stream *xdr,
+ const struct nfs4_delegation *dp,
+ struct nfs4_cb_compound_hdr *hdr)
{
__be32 *p;
- int len = dp->dl_fh.fh_size;
-
- RESERVE_SPACE(4);
- WRITE32(OP_CB_RECALL);
- encode_stateid(xdr, &dp->dl_stateid);
- RESERVE_SPACE(8 + (XDR_QUADLEN(len) << 2));
- WRITE32(0); /* truncate optimization not implemented */
- WRITE32(len);
- WRITEMEM(&dp->dl_fh.fh_base, len);
+
+ encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
+ encode_stateid4(xdr, &dp->dl_stateid);
+
+ p = xdr_reserve_space(xdr, 4);
+ *p++ = xdr_zero; /* truncate */
+
+ encode_nfs_fh4(xdr, &dp->dl_fh);
+
hdr->nops++;
}
-static void
-encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
- struct nfs4_cb_compound_hdr *hdr)
+/*
+ * CB_SEQUENCE4args
+ *
+ * struct CB_SEQUENCE4args {
+ * sessionid4 csa_sessionid;
+ * sequenceid4 csa_sequenceid;
+ * slotid4 csa_slotid;
+ * slotid4 csa_highest_slotid;
+ * bool csa_cachethis;
+ * referring_call_list4 csa_referring_call_lists<>;
+ * };
+ */
+static void encode_cb_sequence4args(struct xdr_stream *xdr,
+ const struct nfsd4_callback *cb,
+ struct nfs4_cb_compound_hdr *hdr)
{
+ struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
__be32 *p;
- struct nfsd4_session *ses = cb->cb_clp->cl_cb_session;
if (hdr->minorversion == 0)
return;
- RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20);
+ encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
+ encode_sessionid4(xdr, session);
+
+ p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
+ *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */
+ *p++ = xdr_zero; /* csa_slotid */
+ *p++ = xdr_zero; /* csa_highest_slotid */
+ *p++ = xdr_zero; /* csa_cachethis */
+ xdr_encode_empty_array(p); /* csa_referring_call_lists */
- WRITE32(OP_CB_SEQUENCE);
- WRITEMEM(ses->se_sessionid.data, NFS4_MAX_SESSIONID_LEN);
- WRITE32(ses->se_cb_seq_nr);
- WRITE32(0); /* slotid, always 0 */
- WRITE32(0); /* highest slotid always 0 */
- WRITE32(0); /* cachethis always 0 */
- WRITE32(0); /* FIXME: support referring_call_lists */
hdr->nops++;
}
-static int
-nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
+/*
+ * NFSv4.0 and NFSv4.1 XDR encode functions
+ *
+ * NFSv4.0 callback argument types are defined in section 15 of RFC
+ * 3530: "Network File System (NFS) version 4 Protocol" and section 20
+ * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
+ * Protocol".
+ */
+
+/*
+ * NB: Without this zero space reservation, callbacks over krb5p fail
+ */
+static int nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p, void *__unused)
{
struct xdr_stream xdrs, *xdr = &xdrs;
xdr_init_encode(&xdrs, &req->rq_snd_buf, p);
- RESERVE_SPACE(0);
+ xdr_reserve_space(xdr, 0);
return 0;
}
-static int
-nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p,
- struct nfsd4_callback *cb)
+/*
+ * 20.2. Operation 4: CB_RECALL - Recall a Delegation
+ */
+static int nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p,
+ const struct nfsd4_callback *cb)
{
struct xdr_stream xdr;
- struct nfs4_delegation *args = cb->cb_op;
+ const struct nfs4_delegation *args = cb->cb_op;
struct nfs4_cb_compound_hdr hdr = {
.ident = cb->cb_clp->cl_cb_ident,
.minorversion = cb->cb_minorversion,
};
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
- encode_cb_compound_hdr(&xdr, &hdr);
- encode_cb_sequence(&xdr, cb, &hdr);
- encode_cb_recall(&xdr, args, &hdr);
+ encode_cb_compound4args(&xdr, &hdr);
+ encode_cb_sequence4args(&xdr, cb, &hdr);
+ encode_cb_recall4args(&xdr, args, &hdr);
encode_cb_nops(&hdr);
return 0;
}