NFSD: Combine decode operations for v4 and v4.1

We were using a different array of function pointers to represent each
minor version.  This makes adding a new minor version tedious, since it
needs a step to copy, paste and modify a new version of the same
functions.

This patch combines the v4 and v4.1 arrays into a single instance and
will check minor version support inside each decoder function.

Signed-off-by: Anna Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 40 insertions, 58 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index d9454fe5653f..99bebea20668 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -945,13 +945,16 @@ static __be32
 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 {
         DECODE_HEAD;
-                    
+
+        if (argp->minorversion >= 1)
+                return nfserr_notsupp;
+
         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
         if (status)
                 return status;
         READ_BUF(4);
         READ32(open_conf->oc_seqid);
-                                                        
+
         DECODE_TAIL;
 }
 
@@ -991,6 +994,14 @@ nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 }
 
 static __be32
+nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
+{
+        if (argp->minorversion == 0)
+                return nfs_ok;
+        return nfserr_notsupp;
+}
+
+static __be32
 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 {
         DECODE_HEAD;
@@ -1061,6 +1072,9 @@ nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 {
         DECODE_HEAD;
 
+        if (argp->minorversion >= 1)
+                return nfserr_notsupp;
+
         READ_BUF(sizeof(clientid_t));
         COPYMEM(clientid, sizeof(clientid_t));
 
@@ -1111,6 +1125,9 @@ nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclient
 {
         DECODE_HEAD;
 
+        if (argp->minorversion >= 1)
+                return nfserr_notsupp;
+
         READ_BUF(NFS4_VERIFIER_SIZE);
         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
 
@@ -1137,6 +1154,9 @@ nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_s
 {
         DECODE_HEAD;
 
+        if (argp->minorversion >= 1)
+                return nfserr_notsupp;
+
         READ_BUF(8 + NFS4_VERIFIER_SIZE);
         COPYMEM(&scd_c->sc_clientid, 8);
         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
@@ -1220,6 +1240,9 @@ nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_rel
 {
         DECODE_HEAD;
 
+        if (argp->minorversion >= 1)
+                return nfserr_notsupp;
+
         READ_BUF(12);
         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
         READ32(rlockowner->rl_owner.len);
@@ -1519,7 +1542,7 @@ static nfsd4_dec nfsd4_dec_ops[] = {
         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
-        [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
+        [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_putpubfh,
         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
@@ -1536,46 +1559,6 @@ static nfsd4_dec nfsd4_dec_ops[] = {
         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
-};
-
-static nfsd4_dec nfsd41_dec_ops[] = {
-        [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
-        [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
-        [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
-        [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
-        [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
-        [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
-        [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
-        [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
-        [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
-        [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
-        [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
-        [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
-        [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
-        [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
-        [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
-        [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
-        [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
-        [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
-        [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
-        [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
-        [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
-        [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
-        [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
-        [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
-        [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
-        [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
-        [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
-        [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
-        [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
-        [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
-        [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
 
         /* new operations for NFSv4.1 */
         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
@@ -1599,23 +1582,23 @@ static nfsd4_dec nfsd41_dec_ops[] = {
         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
 };
 
-struct nfsd4_minorversion_ops {
-        nfsd4_dec *decoders;
-        int nops;
-};
-
-static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
-        [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
-        [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
-        [2] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
-};
+static inline bool
+nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
+{
+        if (op->opnum < FIRST_NFS4_OP || op->opnum > LAST_NFS4_OP)
+                return false;
+        else if (argp->minorversion == 0 && op->opnum > OP_RELEASE_LOCKOWNER)
+                return false;
+        else if (argp->minorversion == 1 && op->opnum > OP_RECLAIM_COMPLETE)
+                return false;
+        return true;
+}
 
 static __be32
 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 {
         DECODE_HEAD;
         struct nfsd4_op *op;
-        struct nfsd4_minorversion_ops *ops;
         bool cachethis = false;
         int i;
 
@@ -1640,10 +1623,9 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
                 }
         }
 
-        if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
+        if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
                 argp->opcnt = 0;
 
-        ops = &nfsd4_minorversion[argp->minorversion];
         for (i = 0; i < argp->opcnt; i++) {
                 op = &argp->ops[i];
                 op->replay = NULL;
@@ -1651,8 +1633,8 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
                 READ_BUF(4);
                 READ32(op->opnum);
 
-                if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
-                        op->status = ops->decoders[op->opnum](argp, &op->u);
+                if (nfsd4_opnum_in_range(argp, op))
+                        op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
                 else {
                         op->opnum = OP_ILLEGAL;
                         op->status = nfserr_op_illegal;