[RFC v3 32/42] NFSD OFFLOAD_STATUS xdr

[Olga Kornievskaia <kolga@xxxxxxxxxx>]

Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
 fs/nfsd/nfs4proc.c | 20 ++++++++++++++++++++
 fs/nfsd/nfs4xdr.c  | 30 ++++++++++++++++++++++++++++--
 fs/nfsd/xdr4.h     | 10 ++++++++++
 3 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 3d8ed3f..6d20ee1 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1468,6 +1468,13 @@ extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
 	fput(file);
 	return status;
 }
+static __be32
+nfsd4_offload_status(struct svc_rqst *rqstp,
+		     struct nfsd4_compound_state *cstate,
+		     struct nfsd4_offload_status *os)
+{
+	return nfserr_notsupp;
+}
 
 static __be32
 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
@@ -2436,6 +2443,14 @@ static inline u32 nfsd4_copy_notify_rsize(struct svc_rqst *rqstp,
 		* sizeof(__be32);
 }
 
+static inline u32 nfsd4_offload_status_rsize(struct svc_rqst *rqstp,
+					     struct nfsd4_op *op)
+{
+	return (op_encode_hdr_size +
+		2 /* osr_count */ +
+		1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
+}
+
 #ifdef CONFIG_NFSD_PNFS
 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
 {
@@ -2846,6 +2861,11 @@ static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
 		.op_name = "OP_COPY_NOTIFY",
 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_copy_notify_rsize,
 	},
+	[OP_OFFLOAD_STATUS] = {
+		.op_func = (nfsd4op_func)nfsd4_offload_status,
+		.op_name = "OP_OFFLOAD_STATUS",
+		.op_rsize_bop = (nfsd4op_rsize)nfsd4_offload_status_rsize,
+	},
 };
 
 /**
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index c4438ac..f032178 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1836,6 +1836,13 @@ static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
 }
 
 static __be32
+nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
+			    struct nfsd4_offload_status *os)
+{
+	return nfsd4_decode_stateid(argp, &os->stateid);
+}
+
+static __be32
 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
 {
 	DECODE_HEAD;
@@ -1942,7 +1949,7 @@ static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
 	[OP_LAYOUTERROR]	= (nfsd4_dec)nfsd4_decode_notsupp,
 	[OP_LAYOUTSTATS]	= (nfsd4_dec)nfsd4_decode_notsupp,
 	[OP_OFFLOAD_CANCEL]	= (nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_OFFLOAD_STATUS]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_OFFLOAD_STATUS]	= (nfsd4_dec)nfsd4_decode_offload_status,
 	[OP_READ_PLUS]		= (nfsd4_dec)nfsd4_decode_notsupp,
 	[OP_SEEK]		= (nfsd4_dec)nfsd4_decode_seek,
 	[OP_WRITE_SAME]		= (nfsd4_dec)nfsd4_decode_notsupp,
@@ -4483,6 +4490,25 @@ static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
 }
 
 static __be32
+nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
+			    struct nfsd4_offload_status *os)
+{
+	struct xdr_stream *xdr = &resp->xdr;
+	__be32 *p;
+
+	if (nfserr)
+		return nfserr;
+
+	p = xdr_reserve_space(xdr, 8 + 4);
+	if (!p)
+		return nfserr_resource;
+	p = xdr_encode_hyper(p, os->count);
+	*p++ = cpu_to_be32(0);
+
+	return nfserr;
+}
+
+static __be32
 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
 		  struct nfsd4_seek *seek)
 {
@@ -4588,7 +4614,7 @@ static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
 	[OP_LAYOUTERROR]	= (nfsd4_enc)nfsd4_encode_noop,
 	[OP_LAYOUTSTATS]	= (nfsd4_enc)nfsd4_encode_noop,
 	[OP_OFFLOAD_CANCEL]	= (nfsd4_enc)nfsd4_encode_noop,
-	[OP_OFFLOAD_STATUS]	= (nfsd4_enc)nfsd4_encode_noop,
+	[OP_OFFLOAD_STATUS]	= (nfsd4_enc)nfsd4_encode_offload_status,
 	[OP_READ_PLUS]		= (nfsd4_enc)nfsd4_encode_noop,
 	[OP_SEEK]		= (nfsd4_enc)nfsd4_encode_seek,
 	[OP_WRITE_SAME]		= (nfsd4_enc)nfsd4_encode_noop,
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index e6fa914..c3e6907 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -561,6 +561,15 @@ struct nfsd4_copy_notify {
 	struct nl4_servers	cpn_src;
 };
 
+struct nfsd4_offload_status {
+	/* request */
+	stateid_t	stateid;
+
+	/* response */
+	u64		count;
+	u32		status;
+};
+
 struct nfsd4_op {
 	int					opnum;
 	__be32					status;
@@ -617,6 +626,7 @@ struct nfsd4_op {
 		struct nfsd4_clone		clone;
 		struct nfsd4_copy		copy;
 		struct nfsd4_copy_notify	copy_notify;
+		struct nfsd4_offload_status	offload_status;
 		struct nfsd4_seek		seek;
 	} u;
 	struct nfs4_replay *			replay;
-- 
1.8.3.1

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