SUNRPC: Parametrize how much of argsize should be zeroed

Currently, SUNRPC clears the whole of .pc_argsize before processing
each incoming RPC transaction. Add an extra parameter to struct
svc_procedure to enable upper layers to reduce the amount of each
operation's argument structure that is zeroed by SUNRPC.

The size of struct nfsd4_compoundargs, in particular, is a lot to
clear on each incoming RPC Call. A subsequent patch will cut this
down to something closer to what NFSv2 and NFSv3 uses.

This patch should cause no behavior changes.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/lockd/svc4proc.c

@@ -521,6 +521,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_void,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_void),
+		.pc_argzero = sizeof(struct nlm_void),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "NULL",
@@ -530,6 +531,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_testargs,
 		.pc_encode = nlm4svc_encode_testres,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St+2+No+Rg,
 		.pc_name = "TEST",
@@ -539,6 +541,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_lockargs,
 		.pc_encode = nlm4svc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "LOCK",
@@ -548,6 +551,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_cancargs,
 		.pc_encode = nlm4svc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "CANCEL",
@@ -557,6 +561,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_unlockargs,
 		.pc_encode = nlm4svc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "UNLOCK",
@@ -566,6 +571,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_testargs,
 		.pc_encode = nlm4svc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "GRANTED",
@@ -575,6 +581,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_testargs,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "TEST_MSG",
@@ -584,6 +591,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_lockargs,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "LOCK_MSG",
@@ -593,6 +601,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_cancargs,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "CANCEL_MSG",
@@ -602,6 +611,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_unlockargs,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "UNLOCK_MSG",
@@ -611,6 +621,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_testargs,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "GRANTED_MSG",
@@ -620,6 +631,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_void,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "TEST_RES",
@@ -629,6 +641,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_void,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "LOCK_RES",
@@ -638,6 +651,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_void,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "CANCEL_RES",
@@ -647,6 +661,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_void,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "UNLOCK_RES",
@@ -656,6 +671,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_res,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "GRANTED_RES",
@@ -665,6 +681,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_reboot,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_reboot),
+		.pc_argzero = sizeof(struct nlm_reboot),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "SM_NOTIFY",
@@ -674,6 +691,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_void,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_void),
+		.pc_argzero = sizeof(struct nlm_void),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = 0,
 		.pc_name = "UNUSED",
@@ -683,6 +701,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_void,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_void),
+		.pc_argzero = sizeof(struct nlm_void),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = 0,
 		.pc_name = "UNUSED",
@@ -692,6 +711,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_void,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_void),
+		.pc_argzero = sizeof(struct nlm_void),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = 0,
 		.pc_name = "UNUSED",
@@ -701,6 +721,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_shareargs,
 		.pc_encode = nlm4svc_encode_shareres,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St+1,
 		.pc_name = "SHARE",
@@ -710,6 +731,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_shareargs,
 		.pc_encode = nlm4svc_encode_shareres,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St+1,
 		.pc_name = "UNSHARE",
@@ -719,6 +741,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_lockargs,
 		.pc_encode = nlm4svc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "NM_LOCK",
@@ -728,6 +751,7 @@ const struct svc_procedure nlmsvc_procedures4[24] = {
 		.pc_decode = nlm4svc_decode_notify,
 		.pc_encode = nlm4svc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "FREE_ALL",

fs/lockd/svcproc.c

@@ -555,6 +555,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_void,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_void),
+		.pc_argzero = sizeof(struct nlm_void),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "NULL",
@@ -564,6 +565,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_testargs,
 		.pc_encode = nlmsvc_encode_testres,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St+2+No+Rg,
 		.pc_name = "TEST",
@@ -573,6 +575,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_lockargs,
 		.pc_encode = nlmsvc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "LOCK",
@@ -582,6 +585,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_cancargs,
 		.pc_encode = nlmsvc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "CANCEL",
@@ -591,6 +595,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_unlockargs,
 		.pc_encode = nlmsvc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "UNLOCK",
@@ -600,6 +605,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_testargs,
 		.pc_encode = nlmsvc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "GRANTED",
@@ -609,6 +615,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_testargs,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "TEST_MSG",
@@ -618,6 +625,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_lockargs,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "LOCK_MSG",
@@ -627,6 +635,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_cancargs,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "CANCEL_MSG",
@@ -636,6 +645,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_unlockargs,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "UNLOCK_MSG",
@@ -645,6 +655,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_testargs,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "GRANTED_MSG",
@@ -654,6 +665,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_void,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "TEST_RES",
@@ -663,6 +675,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_void,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "LOCK_RES",
@@ -672,6 +685,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_void,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "CANCEL_RES",
@@ -681,6 +695,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_void,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "UNLOCK_RES",
@@ -690,6 +705,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_res,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_res),
+		.pc_argzero = sizeof(struct nlm_res),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "GRANTED_RES",
@@ -699,6 +715,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_reboot,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_reboot),
+		.pc_argzero = sizeof(struct nlm_reboot),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "SM_NOTIFY",
@@ -708,6 +725,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_void,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_void),
+		.pc_argzero = sizeof(struct nlm_void),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "UNUSED",
@@ -717,6 +735,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_void,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_void),
+		.pc_argzero = sizeof(struct nlm_void),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "UNUSED",
@@ -726,6 +745,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_void,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_void),
+		.pc_argzero = sizeof(struct nlm_void),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = St,
 		.pc_name = "UNUSED",
@@ -735,6 +755,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_shareargs,
 		.pc_encode = nlmsvc_encode_shareres,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St+1,
 		.pc_name = "SHARE",
@@ -744,6 +765,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_shareargs,
 		.pc_encode = nlmsvc_encode_shareres,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St+1,
 		.pc_name = "UNSHARE",
@@ -753,6 +775,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_lockargs,
 		.pc_encode = nlmsvc_encode_res,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_res),
 		.pc_xdrressize = Ck+St,
 		.pc_name = "NM_LOCK",
@@ -762,6 +785,7 @@ const struct svc_procedure nlmsvc_procedures[24] = {
 		.pc_decode = nlmsvc_decode_notify,
 		.pc_encode = nlmsvc_encode_void,
 		.pc_argsize = sizeof(struct nlm_args),
+		.pc_argzero = sizeof(struct nlm_args),
 		.pc_ressize = sizeof(struct nlm_void),
 		.pc_xdrressize = 0,
 		.pc_name = "FREE_ALL",

fs/nfs/callback_xdr.c

@@ -1065,6 +1065,7 @@ static const struct svc_procedure nfs4_callback_procedures1[] = {
 		.pc_func = nfs4_callback_compound,
 		.pc_encode = nfs4_encode_void,
 		.pc_argsize = 256,
+		.pc_argzero = 256,
 		.pc_ressize = 256,
 		.pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
 		.pc_name = "COMPOUND",

fs/nfsd/nfs2acl.c

@@ -331,6 +331,7 @@ static const struct svc_procedure nfsd_acl_procedures2[5] = {
 		.pc_decode = nfssvc_decode_voidarg,
 		.pc_encode = nfssvc_encode_voidres,
 		.pc_argsize = sizeof(struct nfsd_voidargs),
+		.pc_argzero = sizeof(struct nfsd_voidargs),
 		.pc_ressize = sizeof(struct nfsd_voidres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST,
@@ -342,6 +343,7 @@ static const struct svc_procedure nfsd_acl_procedures2[5] = {
 		.pc_encode = nfsaclsvc_encode_getaclres,
 		.pc_release = nfsaclsvc_release_getacl,
 		.pc_argsize = sizeof(struct nfsd3_getaclargs),
+		.pc_argzero = sizeof(struct nfsd3_getaclargs),
 		.pc_ressize = sizeof(struct nfsd3_getaclres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+1+2*(1+ACL),
@@ -353,6 +355,7 @@ static const struct svc_procedure nfsd_acl_procedures2[5] = {
 		.pc_encode = nfssvc_encode_attrstatres,
 		.pc_release = nfssvc_release_attrstat,
 		.pc_argsize = sizeof(struct nfsd3_setaclargs),
+		.pc_argzero = sizeof(struct nfsd3_setaclargs),
 		.pc_ressize = sizeof(struct nfsd_attrstat),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+AT,
@@ -364,6 +367,7 @@ static const struct svc_procedure nfsd_acl_procedures2[5] = {
 		.pc_encode = nfssvc_encode_attrstatres,
 		.pc_release = nfssvc_release_attrstat,
 		.pc_argsize = sizeof(struct nfsd_fhandle),
+		.pc_argzero = sizeof(struct nfsd_fhandle),
 		.pc_ressize = sizeof(struct nfsd_attrstat),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+AT,
@@ -375,6 +379,7 @@ static const struct svc_procedure nfsd_acl_procedures2[5] = {
 		.pc_encode = nfsaclsvc_encode_accessres,
 		.pc_release = nfsaclsvc_release_access,
 		.pc_argsize = sizeof(struct nfsd3_accessargs),
+		.pc_argzero = sizeof(struct nfsd3_accessargs),
 		.pc_ressize = sizeof(struct nfsd3_accessres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+AT+1,

fs/nfsd/nfs3acl.c

@@ -252,6 +252,7 @@ static const struct svc_procedure nfsd_acl_procedures3[3] = {
 		.pc_decode = nfssvc_decode_voidarg,
 		.pc_encode = nfssvc_encode_voidres,
 		.pc_argsize = sizeof(struct nfsd_voidargs),
+		.pc_argzero = sizeof(struct nfsd_voidargs),
 		.pc_ressize = sizeof(struct nfsd_voidres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST,
@@ -263,6 +264,7 @@ static const struct svc_procedure nfsd_acl_procedures3[3] = {
 		.pc_encode = nfs3svc_encode_getaclres,
 		.pc_release = nfs3svc_release_getacl,
 		.pc_argsize = sizeof(struct nfsd3_getaclargs),
+		.pc_argzero = sizeof(struct nfsd3_getaclargs),
 		.pc_ressize = sizeof(struct nfsd3_getaclres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+1+2*(1+ACL),
@@ -274,6 +276,7 @@ static const struct svc_procedure nfsd_acl_procedures3[3] = {
 		.pc_encode = nfs3svc_encode_setaclres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_setaclargs),
+		.pc_argzero = sizeof(struct nfsd3_setaclargs),
 		.pc_ressize = sizeof(struct nfsd3_attrstat),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+pAT,

fs/nfsd/nfs3proc.c

@@ -809,6 +809,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_decode = nfssvc_decode_voidarg,
 		.pc_encode = nfssvc_encode_voidres,
 		.pc_argsize = sizeof(struct nfsd_voidargs),
+		.pc_argzero = sizeof(struct nfsd_voidargs),
 		.pc_ressize = sizeof(struct nfsd_voidres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST,
@@ -820,6 +821,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_getattrres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd_fhandle),
+		.pc_argzero = sizeof(struct nfsd_fhandle),
 		.pc_ressize = sizeof(struct nfsd3_attrstatres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+AT,
@@ -831,6 +833,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_wccstatres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_sattrargs),
+		.pc_argzero = sizeof(struct nfsd3_sattrargs),
 		.pc_ressize = sizeof(struct nfsd3_wccstatres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+WC,
@@ -842,6 +845,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_lookupres,
 		.pc_release = nfs3svc_release_fhandle2,
 		.pc_argsize = sizeof(struct nfsd3_diropargs),
+		.pc_argzero = sizeof(struct nfsd3_diropargs),
 		.pc_ressize = sizeof(struct nfsd3_diropres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+FH+pAT+pAT,
@@ -853,6 +857,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_accessres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_accessargs),
+		.pc_argzero = sizeof(struct nfsd3_accessargs),
 		.pc_ressize = sizeof(struct nfsd3_accessres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+pAT+1,
@@ -864,6 +869,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_readlinkres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd_fhandle),
+		.pc_argzero = sizeof(struct nfsd_fhandle),
 		.pc_ressize = sizeof(struct nfsd3_readlinkres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
@@ -875,6 +881,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_readres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_readargs),
+		.pc_argzero = sizeof(struct nfsd3_readargs),
 		.pc_ressize = sizeof(struct nfsd3_readres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
@@ -886,6 +893,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_writeres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_writeargs),
+		.pc_argzero = sizeof(struct nfsd3_writeargs),
 		.pc_ressize = sizeof(struct nfsd3_writeres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+WC+4,
@@ -897,6 +905,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_createres,
 		.pc_release = nfs3svc_release_fhandle2,
 		.pc_argsize = sizeof(struct nfsd3_createargs),
+		.pc_argzero = sizeof(struct nfsd3_createargs),
 		.pc_ressize = sizeof(struct nfsd3_createres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+(1+FH+pAT)+WC,
@@ -908,6 +917,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_createres,
 		.pc_release = nfs3svc_release_fhandle2,
 		.pc_argsize = sizeof(struct nfsd3_mkdirargs),
+		.pc_argzero = sizeof(struct nfsd3_mkdirargs),
 		.pc_ressize = sizeof(struct nfsd3_createres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+(1+FH+pAT)+WC,
@@ -919,6 +929,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_createres,
 		.pc_release = nfs3svc_release_fhandle2,
 		.pc_argsize = sizeof(struct nfsd3_symlinkargs),
+		.pc_argzero = sizeof(struct nfsd3_symlinkargs),
 		.pc_ressize = sizeof(struct nfsd3_createres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+(1+FH+pAT)+WC,
@@ -930,6 +941,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_createres,
 		.pc_release = nfs3svc_release_fhandle2,
 		.pc_argsize = sizeof(struct nfsd3_mknodargs),
+		.pc_argzero = sizeof(struct nfsd3_mknodargs),
 		.pc_ressize = sizeof(struct nfsd3_createres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+(1+FH+pAT)+WC,
@@ -941,6 +953,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_wccstatres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_diropargs),
+		.pc_argzero = sizeof(struct nfsd3_diropargs),
 		.pc_ressize = sizeof(struct nfsd3_wccstatres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+WC,
@@ -952,6 +965,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_wccstatres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_diropargs),
+		.pc_argzero = sizeof(struct nfsd3_diropargs),
 		.pc_ressize = sizeof(struct nfsd3_wccstatres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+WC,
@@ -963,6 +977,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_renameres,
 		.pc_release = nfs3svc_release_fhandle2,
 		.pc_argsize = sizeof(struct nfsd3_renameargs),
+		.pc_argzero = sizeof(struct nfsd3_renameargs),
 		.pc_ressize = sizeof(struct nfsd3_renameres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+WC+WC,
@@ -974,6 +989,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_linkres,
 		.pc_release = nfs3svc_release_fhandle2,
 		.pc_argsize = sizeof(struct nfsd3_linkargs),
+		.pc_argzero = sizeof(struct nfsd3_linkargs),
 		.pc_ressize = sizeof(struct nfsd3_linkres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+pAT+WC,
@@ -985,6 +1001,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_readdirres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_readdirargs),
+		.pc_argzero = sizeof(struct nfsd3_readdirargs),
 		.pc_ressize = sizeof(struct nfsd3_readdirres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_name = "READDIR",
@@ -995,6 +1012,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_readdirres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_readdirplusargs),
+		.pc_argzero = sizeof(struct nfsd3_readdirplusargs),
 		.pc_ressize = sizeof(struct nfsd3_readdirres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_name = "READDIRPLUS",
@@ -1004,6 +1022,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_decode = nfs3svc_decode_fhandleargs,
 		.pc_encode = nfs3svc_encode_fsstatres,
 		.pc_argsize = sizeof(struct nfsd3_fhandleargs),
+		.pc_argzero = sizeof(struct nfsd3_fhandleargs),
 		.pc_ressize = sizeof(struct nfsd3_fsstatres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+pAT+2*6+1,
@@ -1014,6 +1033,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_decode = nfs3svc_decode_fhandleargs,
 		.pc_encode = nfs3svc_encode_fsinfores,
 		.pc_argsize = sizeof(struct nfsd3_fhandleargs),
+		.pc_argzero = sizeof(struct nfsd3_fhandleargs),
 		.pc_ressize = sizeof(struct nfsd3_fsinfores),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+pAT+12,
@@ -1024,6 +1044,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_decode = nfs3svc_decode_fhandleargs,
 		.pc_encode = nfs3svc_encode_pathconfres,
 		.pc_argsize = sizeof(struct nfsd3_fhandleargs),
+		.pc_argzero = sizeof(struct nfsd3_fhandleargs),
 		.pc_ressize = sizeof(struct nfsd3_pathconfres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+pAT+6,
@@ -1035,6 +1056,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_encode = nfs3svc_encode_commitres,
 		.pc_release = nfs3svc_release_fhandle,
 		.pc_argsize = sizeof(struct nfsd3_commitargs),
+		.pc_argzero = sizeof(struct nfsd3_commitargs),
 		.pc_ressize = sizeof(struct nfsd3_commitres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+WC+2,

fs/nfsd/nfs4proc.c

@@ -3585,6 +3585,7 @@ static const struct svc_procedure nfsd_procedures4[2] = {
 		.pc_decode = nfssvc_decode_voidarg,
 		.pc_encode = nfssvc_encode_voidres,
 		.pc_argsize = sizeof(struct nfsd_voidargs),
+		.pc_argzero = sizeof(struct nfsd_voidargs),
 		.pc_ressize = sizeof(struct nfsd_voidres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = 1,
@@ -3595,6 +3596,7 @@ static const struct svc_procedure nfsd_procedures4[2] = {
 		.pc_decode = nfs4svc_decode_compoundargs,
 		.pc_encode = nfs4svc_encode_compoundres,
 		.pc_argsize = sizeof(struct nfsd4_compoundargs),
+		.pc_argzero = sizeof(struct nfsd4_compoundargs),
 		.pc_ressize = sizeof(struct nfsd4_compoundres),
 		.pc_release = nfsd4_release_compoundargs,
 		.pc_cachetype = RC_NOCACHE,

fs/nfsd/nfsproc.c

@@ -645,6 +645,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_voidarg,
 		.pc_encode = nfssvc_encode_voidres,
 		.pc_argsize = sizeof(struct nfsd_voidargs),
+		.pc_argzero = sizeof(struct nfsd_voidargs),
 		.pc_ressize = sizeof(struct nfsd_voidres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = 0,
@@ -656,6 +657,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_encode = nfssvc_encode_attrstatres,
 		.pc_release = nfssvc_release_attrstat,
 		.pc_argsize = sizeof(struct nfsd_fhandle),
+		.pc_argzero = sizeof(struct nfsd_fhandle),
 		.pc_ressize = sizeof(struct nfsd_attrstat),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+AT,
@@ -667,6 +669,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_encode = nfssvc_encode_attrstatres,
 		.pc_release = nfssvc_release_attrstat,
 		.pc_argsize = sizeof(struct nfsd_sattrargs),
+		.pc_argzero = sizeof(struct nfsd_sattrargs),
 		.pc_ressize = sizeof(struct nfsd_attrstat),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+AT,
@@ -677,6 +680,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_voidarg,
 		.pc_encode = nfssvc_encode_voidres,
 		.pc_argsize = sizeof(struct nfsd_voidargs),
+		.pc_argzero = sizeof(struct nfsd_voidargs),
 		.pc_ressize = sizeof(struct nfsd_voidres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = 0,
@@ -688,6 +692,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_encode = nfssvc_encode_diropres,
 		.pc_release = nfssvc_release_diropres,
 		.pc_argsize = sizeof(struct nfsd_diropargs),
+		.pc_argzero = sizeof(struct nfsd_diropargs),
 		.pc_ressize = sizeof(struct nfsd_diropres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+FH+AT,
@@ -698,6 +703,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_fhandleargs,
 		.pc_encode = nfssvc_encode_readlinkres,
 		.pc_argsize = sizeof(struct nfsd_fhandle),
+		.pc_argzero = sizeof(struct nfsd_fhandle),
 		.pc_ressize = sizeof(struct nfsd_readlinkres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
@@ -709,6 +715,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_encode = nfssvc_encode_readres,
 		.pc_release = nfssvc_release_readres,
 		.pc_argsize = sizeof(struct nfsd_readargs),
+		.pc_argzero = sizeof(struct nfsd_readargs),
 		.pc_ressize = sizeof(struct nfsd_readres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
@@ -719,6 +726,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_voidarg,
 		.pc_encode = nfssvc_encode_voidres,
 		.pc_argsize = sizeof(struct nfsd_voidargs),
+		.pc_argzero = sizeof(struct nfsd_voidargs),
 		.pc_ressize = sizeof(struct nfsd_voidres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = 0,
@@ -730,6 +738,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_encode = nfssvc_encode_attrstatres,
 		.pc_release = nfssvc_release_attrstat,
 		.pc_argsize = sizeof(struct nfsd_writeargs),
+		.pc_argzero = sizeof(struct nfsd_writeargs),
 		.pc_ressize = sizeof(struct nfsd_attrstat),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+AT,
@@ -741,6 +750,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_encode = nfssvc_encode_diropres,
 		.pc_release = nfssvc_release_diropres,
 		.pc_argsize = sizeof(struct nfsd_createargs),
+		.pc_argzero = sizeof(struct nfsd_createargs),
 		.pc_ressize = sizeof(struct nfsd_diropres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+FH+AT,
@@ -751,6 +761,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_diropargs,
 		.pc_encode = nfssvc_encode_statres,
 		.pc_argsize = sizeof(struct nfsd_diropargs),
+		.pc_argzero = sizeof(struct nfsd_diropargs),
 		.pc_ressize = sizeof(struct nfsd_stat),
 		.pc_cachetype = RC_REPLSTAT,
 		.pc_xdrressize = ST,
@@ -761,6 +772,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_renameargs,
 		.pc_encode = nfssvc_encode_statres,
 		.pc_argsize = sizeof(struct nfsd_renameargs),
+		.pc_argzero = sizeof(struct nfsd_renameargs),
 		.pc_ressize = sizeof(struct nfsd_stat),
 		.pc_cachetype = RC_REPLSTAT,
 		.pc_xdrressize = ST,
@@ -771,6 +783,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_linkargs,
 		.pc_encode = nfssvc_encode_statres,
 		.pc_argsize = sizeof(struct nfsd_linkargs),
+		.pc_argzero = sizeof(struct nfsd_linkargs),
 		.pc_ressize = sizeof(struct nfsd_stat),
 		.pc_cachetype = RC_REPLSTAT,
 		.pc_xdrressize = ST,
@@ -781,6 +794,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_symlinkargs,
 		.pc_encode = nfssvc_encode_statres,
 		.pc_argsize = sizeof(struct nfsd_symlinkargs),
+		.pc_argzero = sizeof(struct nfsd_symlinkargs),
 		.pc_ressize = sizeof(struct nfsd_stat),
 		.pc_cachetype = RC_REPLSTAT,
 		.pc_xdrressize = ST,
@@ -792,6 +806,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_encode = nfssvc_encode_diropres,
 		.pc_release = nfssvc_release_diropres,
 		.pc_argsize = sizeof(struct nfsd_createargs),
+		.pc_argzero = sizeof(struct nfsd_createargs),
 		.pc_ressize = sizeof(struct nfsd_diropres),
 		.pc_cachetype = RC_REPLBUFF,
 		.pc_xdrressize = ST+FH+AT,
@@ -802,6 +817,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_diropargs,
 		.pc_encode = nfssvc_encode_statres,
 		.pc_argsize = sizeof(struct nfsd_diropargs),
+		.pc_argzero = sizeof(struct nfsd_diropargs),
 		.pc_ressize = sizeof(struct nfsd_stat),
 		.pc_cachetype = RC_REPLSTAT,
 		.pc_xdrressize = ST,
@@ -812,6 +828,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_readdirargs,
 		.pc_encode = nfssvc_encode_readdirres,
 		.pc_argsize = sizeof(struct nfsd_readdirargs),
+		.pc_argzero = sizeof(struct nfsd_readdirargs),
 		.pc_ressize = sizeof(struct nfsd_readdirres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_name = "READDIR",
@@ -821,6 +838,7 @@ static const struct svc_procedure nfsd_procedures2[18] = {
 		.pc_decode = nfssvc_decode_fhandleargs,
 		.pc_encode = nfssvc_encode_statfsres,
 		.pc_argsize = sizeof(struct nfsd_fhandle),
+		.pc_argzero = sizeof(struct nfsd_fhandle),
 		.pc_ressize = sizeof(struct nfsd_statfsres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+5,

include/linux/sunrpc/svc.h

@@ -472,6 +472,7 @@ struct svc_procedure {
 	/* XDR free result: */
 	void			(*pc_release)(struct svc_rqst *);
 	unsigned int		pc_argsize;	/* argument struct size */
+	unsigned int		pc_argzero;	/* how much of argument to clear */
 	unsigned int		pc_ressize;	/* result struct size */
 	unsigned int		pc_cachetype;	/* cache info (NFS) */
 	unsigned int		pc_xdrressize;	/* maximum size of XDR reply */

net/sunrpc/svc.c

@@ -1205,7 +1205,7 @@ svc_generic_init_request(struct svc_rqst *rqstp,
 		goto err_bad_proc;
 
 	/* Initialize storage for argp and resp */
-	memset(rqstp->rq_argp, 0, procp->pc_argsize);
+	memset(rqstp->rq_argp, 0, procp->pc_argzero);
 	memset(rqstp->rq_resp, 0, procp->pc_ressize);
 
 	/* Bump per-procedure stats counter */