NFSD: Revert 738401a

There's nothing wrong with this commit, but this is dead code now
that nothing triggers a CB_GETATTR callback. It can be re-introduced
once the issues with handling conflicting GETATTRs are resolved.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Author: chucklever

fs/nfsd/nfs4callback.c

@@ -84,21 +84,7 @@ static void encode_uint32(struct xdr_stream *xdr, u32 n)
 static void encode_bitmap4(struct xdr_stream *xdr, const __u32 *bitmap,
 			   size_t len)
 {
-	xdr_stream_encode_uint32_array(xdr, bitmap, len);
-}
-
-static int decode_cb_fattr4(struct xdr_stream *xdr, uint32_t *bitmap,
-				struct nfs4_cb_fattr *fattr)
-{
-	fattr->ncf_cb_change = 0;
-	fattr->ncf_cb_fsize = 0;
-	if (bitmap[0] & FATTR4_WORD0_CHANGE)
-		if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_change) < 0)
-			return -NFSERR_BAD_XDR;
-	if (bitmap[0] & FATTR4_WORD0_SIZE)
-		if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_fsize) < 0)
-			return -NFSERR_BAD_XDR;
-	return 0;
+	WARN_ON_ONCE(xdr_stream_encode_uint32_array(xdr, bitmap, len) < 0);
 }
 
 /*
@@ -371,30 +357,6 @@ encode_cb_recallany4args(struct xdr_stream *xdr,
 	hdr->nops++;
 }
 
-/*
- * CB_GETATTR4args
- *	struct CB_GETATTR4args {
- *	   nfs_fh4 fh;
- *	   bitmap4 attr_request;
- *	};
- *
- * The size and change attributes are the only one
- * guaranteed to be serviced by the client.
- */
-static void
-encode_cb_getattr4args(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr,
-			struct nfs4_cb_fattr *fattr)
-{
-	struct nfs4_delegation *dp =
-		container_of(fattr, struct nfs4_delegation, dl_cb_fattr);
-	struct knfsd_fh *fh = &dp->dl_stid.sc_file->fi_fhandle;
-
-	encode_nfs_cb_opnum4(xdr, OP_CB_GETATTR);
-	encode_nfs_fh4(xdr, fh);
-	encode_bitmap4(xdr, fattr->ncf_cb_bmap, ARRAY_SIZE(fattr->ncf_cb_bmap));
-	hdr->nops++;
-}
-
 /*
  * CB_SEQUENCE4args
  *
@@ -530,26 +492,6 @@ static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
 	xdr_reserve_space(xdr, 0);
 }
 
-/*
- * 20.1.  Operation 3: CB_GETATTR - Get Attributes
- */
-static void nfs4_xdr_enc_cb_getattr(struct rpc_rqst *req,
-		struct xdr_stream *xdr, const void *data)
-{
-	const struct nfsd4_callback *cb = data;
-	struct nfs4_cb_fattr *ncf =
-		container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
-	struct nfs4_cb_compound_hdr hdr = {
-		.ident = cb->cb_clp->cl_cb_ident,
-		.minorversion = cb->cb_clp->cl_minorversion,
-	};
-
-	encode_cb_compound4args(xdr, &hdr);
-	encode_cb_sequence4args(xdr, cb, &hdr);
-	encode_cb_getattr4args(xdr, &hdr, ncf);
-	encode_cb_nops(&hdr);
-}
-
 /*
  * 20.2. Operation 4: CB_RECALL - Recall a Delegation
  */
@@ -605,42 +547,6 @@ static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
 	return 0;
 }
 
-/*
- * 20.1.  Operation 3: CB_GETATTR - Get Attributes
- */
-static int nfs4_xdr_dec_cb_getattr(struct rpc_rqst *rqstp,
-				  struct xdr_stream *xdr,
-				  void *data)
-{
-	struct nfsd4_callback *cb = data;
-	struct nfs4_cb_compound_hdr hdr;
-	int status;
-	u32 bitmap[3] = {0};
-	u32 attrlen;
-	struct nfs4_cb_fattr *ncf =
-		container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
-
-	status = decode_cb_compound4res(xdr, &hdr);
-	if (unlikely(status))
-		return status;
-
-	status = decode_cb_sequence4res(xdr, cb);
-	if (unlikely(status || cb->cb_seq_status))
-		return status;
-
-	status = decode_cb_op_status(xdr, OP_CB_GETATTR, &cb->cb_status);
-	if (status)
-		return status;
-	if (xdr_stream_decode_uint32_array(xdr, bitmap, 3) < 0)
-		return -NFSERR_BAD_XDR;
-	if (xdr_stream_decode_u32(xdr, &attrlen) < 0)
-		return -NFSERR_BAD_XDR;
-	if (attrlen > (sizeof(ncf->ncf_cb_change) + sizeof(ncf->ncf_cb_fsize)))
-		return -NFSERR_BAD_XDR;
-	status = decode_cb_fattr4(xdr, bitmap, ncf);
-	return status;
-}
-
 /*
  * 20.2. Operation 4: CB_RECALL - Recall a Delegation
  */
@@ -949,7 +855,6 @@ static const struct rpc_procinfo nfs4_cb_procedures[] = {
 	PROC(CB_NOTIFY_LOCK,	COMPOUND,	cb_notify_lock,	cb_notify_lock),
 	PROC(CB_OFFLOAD,	COMPOUND,	cb_offload,	cb_offload),
 	PROC(CB_RECALL_ANY,	COMPOUND,	cb_recall_any,	cb_recall_any),
-	PROC(CB_GETATTR,	COMPOUND,	cb_getattr,	cb_getattr),
 };
 
 static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];

fs/nfsd/state.h

@@ -117,16 +117,6 @@ struct nfs4_cpntf_state {
 	time64_t		cpntf_time;	/* last time stateid used */
 };
 
-struct nfs4_cb_fattr {
-	struct nfsd4_callback ncf_getattr;
-	u32 ncf_cb_status;
-	u32 ncf_cb_bmap[1];
-
-	/* from CB_GETATTR reply */
-	u64 ncf_cb_change;
-	u64 ncf_cb_fsize;
-};
-
 /*
  * Represents a delegation stateid. The nfs4_client holds references to these
  * and they are put when it is being destroyed or when the delegation is
@@ -160,9 +150,6 @@ struct nfs4_delegation {
 	int			dl_retries;
 	struct nfsd4_callback	dl_recall;
 	bool			dl_recalled;
-
-	/* for CB_GETATTR */
-	struct nfs4_cb_fattr    dl_cb_fattr;
 };
 
 #define cb_to_delegation(cb) \
@@ -653,7 +640,6 @@ enum nfsd4_cb_op {
 	NFSPROC4_CLNT_CB_SEQUENCE,
 	NFSPROC4_CLNT_CB_NOTIFY_LOCK,
 	NFSPROC4_CLNT_CB_RECALL_ANY,
-	NFSPROC4_CLNT_CB_GETATTR,
 };
 
 /* Returns true iff a is later than b: */

fs/nfsd/xdr4cb.h

@@ -54,21 +54,3 @@
 #define NFS4_dec_cb_recall_any_sz	(cb_compound_dec_hdr_sz  +      \
 					cb_sequence_dec_sz +            \
 					op_dec_sz)
-
-/*
- * 1: CB_GETATTR opcode (32-bit)
- * N: file_handle
- * 1: number of entry in attribute array (32-bit)
- * 1: entry 0 in attribute array (32-bit)
- */
-#define NFS4_enc_cb_getattr_sz		(cb_compound_enc_hdr_sz +       \
-					cb_sequence_enc_sz +            \
-					1 + enc_nfs4_fh_sz + 1 + 1)
-/*
- * 4: fattr_bitmap_maxsz
- * 1: attribute array len
- * 2: change attr (64-bit)
- * 2: size (64-bit)
- */
-#define NFS4_dec_cb_getattr_sz		(cb_compound_dec_hdr_sz  +      \
-			cb_sequence_dec_sz + 4 + 1 + 2 + 2 + op_dec_sz)