NFSD: Replace READ* macros in nfsd4_decode_layoutcommit()

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

fs/nfsd/nfs4xdr.c

@@ -274,20 +274,6 @@ nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
 	return nfs_ok;
 }
 
-static __be32
-nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
-{
-	DECODE_HEAD;
-
-	READ_BUF(12);
-	p = xdr_decode_hyper(p, &tv->tv_sec);
-	tv->tv_nsec = be32_to_cpup(p++);
-	if (tv->tv_nsec >= (u32)1000000000)
-		return nfserr_inval;
-
-	DECODE_TAIL;
-}
-
 static __be32
 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
 {
@@ -651,6 +637,29 @@ nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
 	memcpy(devid, p, sizeof(*devid));
 	return nfs_ok;
 }
+
+static __be32
+nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
+			   struct nfsd4_layoutcommit *lcp)
+{
+	if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
+		return nfserr_bad_xdr;
+	if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
+		return nfserr_bad_xdr;
+	if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
+		return nfserr_bad_xdr;
+
+	if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
+		return nfserr_bad_xdr;
+	if (lcp->lc_up_len > 0) {
+		lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
+		if (!lcp->lc_up_layout)
+			return nfserr_bad_xdr;
+	}
+
+	return nfs_ok;
+}
+
 #endif /* CONFIG_NFSD_PNFS */
 
 static __be32
@@ -1796,6 +1805,41 @@ nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
 	return nfs_ok;
 }
 
+static __be32
+nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
+			  struct nfsd4_layoutcommit *lcp)
+{
+	__be32 *p, status;
+
+	if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
+		return nfserr_bad_xdr;
+	if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
+		return nfserr_bad_xdr;
+	if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
+		return nfserr_bad_xdr;
+	status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
+	if (status)
+		return status;
+	if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
+		return nfserr_bad_xdr;
+	if (lcp->lc_newoffset) {
+		if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
+			return nfserr_bad_xdr;
+	} else
+		lcp->lc_last_wr = 0;
+	p = xdr_inline_decode(argp->xdr, XDR_UNIT);
+	if (!p)
+		return nfserr_bad_xdr;
+	if (xdr_item_is_present(p)) {
+		status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
+		if (status)
+			return status;
+	} else {
+		lcp->lc_mtime.tv_nsec = UTIME_NOW;
+	}
+	return nfsd4_decode_layoutupdate4(argp, lcp);
+}
+
 static __be32
 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
 		struct nfsd4_layoutget *lgp)
@@ -1820,54 +1864,6 @@ nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
 	DECODE_TAIL;
 }
 
-static __be32
-nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
-		struct nfsd4_layoutcommit *lcp)
-{
-	DECODE_HEAD;
-	u32 timechange;
-
-	READ_BUF(20);
-	p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
-	p = xdr_decode_hyper(p, &lcp->lc_seg.length);
-	lcp->lc_reclaim = be32_to_cpup(p++);
-
-	status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
-	if (status)
-		return status;
-
-	READ_BUF(4);
-	lcp->lc_newoffset = be32_to_cpup(p++);
-	if (lcp->lc_newoffset) {
-		READ_BUF(8);
-		p = xdr_decode_hyper(p, &lcp->lc_last_wr);
-	} else
-		lcp->lc_last_wr = 0;
-	READ_BUF(4);
-	timechange = be32_to_cpup(p++);
-	if (timechange) {
-		status = nfsd4_decode_time(argp, &lcp->lc_mtime);
-		if (status)
-			return status;
-	} else {
-		lcp->lc_mtime.tv_nsec = UTIME_NOW;
-	}
-	READ_BUF(8);
-	lcp->lc_layout_type = be32_to_cpup(p++);
-
-	/*
-	 * Save the layout update in XDR format and let the layout driver deal
-	 * with it later.
-	 */
-	lcp->lc_up_len = be32_to_cpup(p++);
-	if (lcp->lc_up_len > 0) {
-		READ_BUF(lcp->lc_up_len);
-		READMEM(lcp->lc_up_layout, lcp->lc_up_len);
-	}
-
-	DECODE_TAIL;
-}
-
 static __be32
 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
 		struct nfsd4_layoutreturn *lrp)