NFSv4.1: layoutcommit

The filelayout driver sends LAYOUTCOMMIT only when COMMIT goes to
the data server (as opposed to the MDS) and the data server WRITE
is not NFS_FILE_SYNC.

Only whole file layout support means that there is only one IOMODE_RW layout
segment.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Mingyang Guo <guomingyang@nrchpc.ac.cn>
Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn>
Signed-off-by: Zhang Jingwang <zhangjingwang@nrchpc.ac.cn>
Tested-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 07cdf925c52..207d399c8de 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -324,6 +324,18 @@ static int nfs4_stat_to_errno(int);
 #define decode_layoutget_maxsz	(op_decode_hdr_maxsz + 8 + \
 				decode_stateid_maxsz + \
 				XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
+#define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
+				2 /* offset */ + \
+				2 /* length */ + \
+				1 /* reclaim */ + \
+				encode_stateid_maxsz + \
+				1 /* new offset (true) */ + \
+				2 /* last byte written */ + \
+				1 /* nt_timechanged (false) */ + \
+				1 /* layoutupdate4 layout type */ + \
+				1 /* NULL filelayout layoutupdate4 payload */)
+#define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
+
 #else /* CONFIG_NFS_V4_1 */
 #define encode_sequence_maxsz	0
 #define decode_sequence_maxsz	0
@@ -727,6 +739,17 @@ static int nfs4_stat_to_errno(int);
 				decode_sequence_maxsz + \
 				decode_putfh_maxsz +        \
 				decode_layoutget_maxsz)
+#define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
+				encode_sequence_maxsz +\
+				encode_putfh_maxsz + \
+				encode_layoutcommit_maxsz + \
+				encode_getattr_maxsz)
+#define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
+				decode_sequence_maxsz + \
+				decode_putfh_maxsz + \
+				decode_layoutcommit_maxsz + \
+				decode_getattr_maxsz)
+
 
 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 				      compound_encode_hdr_maxsz +
@@ -1816,6 +1839,34 @@ encode_layoutget(struct xdr_stream *xdr,
 	hdr->nops++;
 	hdr->replen += decode_layoutget_maxsz;
 }
+
+static int
+encode_layoutcommit(struct xdr_stream *xdr,
+		    const struct nfs4_layoutcommit_args *args,
+		    struct compound_hdr *hdr)
+{
+	__be32 *p;
+
+	dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
+		NFS_SERVER(args->inode)->pnfs_curr_ld->id);
+
+	p = reserve_space(xdr, 48 + NFS4_STATEID_SIZE);
+	*p++ = cpu_to_be32(OP_LAYOUTCOMMIT);
+	/* Only whole file layouts */
+	p = xdr_encode_hyper(p, 0); /* offset */
+	p = xdr_encode_hyper(p, NFS4_MAX_UINT64); /* length */
+	*p++ = cpu_to_be32(0); /* reclaim */
+	p = xdr_encode_opaque_fixed(p, args->stateid.data, NFS4_STATEID_SIZE);
+	*p++ = cpu_to_be32(1); /* newoffset = TRUE */
+	p = xdr_encode_hyper(p, args->lastbytewritten);
+	*p++ = cpu_to_be32(0); /* Never send time_modify_changed */
+	*p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
+	*p++ = cpu_to_be32(0); /* no file layout payload */
+
+	hdr->nops++;
+	hdr->replen += decode_layoutcommit_maxsz;
+	return 0;
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 /*
@@ -2607,6 +2658,26 @@ static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
 	encode_layoutget(xdr, args, &hdr);
 	encode_nops(&hdr);
 }
+
+/*
+ *  Encode LAYOUTCOMMIT request
+ */
+static int nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
+				     struct xdr_stream *xdr,
+				     struct nfs4_layoutcommit_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_putfh(xdr, NFS_FH(args->inode), &hdr);
+	encode_layoutcommit(xdr, args, &hdr);
+	encode_getfattr(xdr, args->bitmask, &hdr);
+	encode_nops(&hdr);
+	return 0;
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
@@ -5007,6 +5078,35 @@ out_overflow:
 	print_overflow_msg(__func__, xdr);
 	return -EIO;
 }
+
+static int decode_layoutcommit(struct xdr_stream *xdr,
+			       struct rpc_rqst *req,
+			       struct nfs4_layoutcommit_res *res)
+{
+	__be32 *p;
+	__u32 sizechanged;
+	int status;
+
+	status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
+	if (status)
+		return status;
+
+	p = xdr_inline_decode(xdr, 4);
+	if (unlikely(!p))
+		goto out_overflow;
+	sizechanged = be32_to_cpup(p);
+
+	if (sizechanged) {
+		/* throw away new size */
+		p = xdr_inline_decode(xdr, 8);
+		if (unlikely(!p))
+			goto out_overflow;
+	}
+	return 0;
+out_overflow:
+	print_overflow_msg(__func__, xdr);
+	return -EIO;
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 /*
@@ -6068,6 +6168,34 @@ static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
 out:
 	return status;
 }
+
+/*
+ * Decode LAYOUTCOMMIT response
+ */
+static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
+				     struct xdr_stream *xdr,
+				     struct nfs4_layoutcommit_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_putfh(xdr);
+	if (status)
+		goto out;
+	status = decode_layoutcommit(xdr, rqstp, res);
+	if (status)
+		goto out;
+	decode_getfattr(xdr, res->fattr, res->server,
+			!RPC_IS_ASYNC(rqstp->rq_task));
+out:
+	return status;
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 /**
@@ -6269,6 +6397,7 @@ struct rpc_procinfo	nfs4_procedures[] = {
 	PROC(RECLAIM_COMPLETE,	enc_reclaim_complete,	dec_reclaim_complete),
 	PROC(GETDEVICEINFO,	enc_getdeviceinfo,	dec_getdeviceinfo),
 	PROC(LAYOUTGET,		enc_layoutget,		dec_layoutget),
+	PROC(LAYOUTCOMMIT,	enc_layoutcommit,	dec_layoutcommit),
 #endif /* CONFIG_NFS_V4_1 */
 };