NFS: use dynamically computed compound_hdr.replen for xdr_inline_pages offset

As Trond suggested, rather than passing a constant to xdr_inline_pages,
keep a running count of the expected reply bytes.  In preparation for
nfs41, where additional op sequence are expteced when talking to nfs41
servers.

[NFS: cb_compoundhdr.replen is in words not bytes]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: get fs_locations replen before encoding the GETATTR]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: get getacl replen before encoding the GETATTR]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 10 insertions, 38 deletions

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 746c6a52794c..68889469d114 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1721,20 +1721,13 @@ static int nfs4_xdr_enc_readlink(struct rpc_rqst *req, __be32 *p, const struct n
         struct compound_hdr hdr = {
                 .nops = 0,
         };
-        struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
-        unsigned int replen;
 
         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
         encode_compound_hdr(&xdr, req, &hdr);
         encode_putfh(&xdr, args->fh, &hdr);
         encode_readlink(&xdr, args, req, &hdr);
 
-        /* set up reply kvec
-         *    toplevel_status + taglen + rescount + OP_PUTFH + status
-         *      + OP_READLINK + status + string length = 8
-         */
-        replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS4_dec_readlink_sz) << 2;
-        xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages,
+        xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
                         args->pgbase, args->pglen);
         encode_nops(&hdr);
         return 0;
@@ -1749,23 +1742,16 @@ static int nfs4_xdr_enc_readdir(struct rpc_rqst *req, __be32 *p, const struct nf
         struct compound_hdr hdr = {
                 .nops = 0,
         };
-        struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
-        int replen;
 
         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
         encode_compound_hdr(&xdr, req, &hdr);
         encode_putfh(&xdr, args->fh, &hdr);
         encode_readdir(&xdr, args, req, &hdr);
 
-        /* set up reply kvec
-         *    toplevel_status + taglen + rescount + OP_PUTFH + status
-         *      + OP_READDIR + status + verifer(2)  = 9
-         */
-        replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS4_dec_readdir_sz) << 2;
-        xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages,
+        xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
                          args->pgbase, args->count);
         dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
-                        __func__, replen, args->pages,
+                        __func__, hdr.replen << 2, args->pages,
                         args->pgbase, args->count);
         encode_nops(&hdr);
         return 0;
@@ -1776,24 +1762,17 @@ static int nfs4_xdr_enc_readdir(struct rpc_rqst *req, __be32 *p, const struct nf
  */
 static int nfs4_xdr_enc_read(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
 {
-        struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
         struct xdr_stream xdr;
         struct compound_hdr hdr = {
                 .nops = 0,
         };
-        int replen;
 
         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
         encode_compound_hdr(&xdr, req, &hdr);
         encode_putfh(&xdr, args->fh, &hdr);
         encode_read(&xdr, args, &hdr);
 
-        /* set up reply kvec
-         *    toplevel status + taglen=0 + rescount + OP_PUTFH + status
-         *       + OP_READ + status + eof + datalen = 9
-         */
-        replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS4_dec_read_sz) << 2;
-        xdr_inline_pages(&req->rq_rcv_buf, replen,
+        xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
                          args->pages, args->pgbase, args->count);
         req->rq_rcv_buf.flags |= XDRBUF_READ;
         encode_nops(&hdr);
@@ -1827,20 +1806,18 @@ nfs4_xdr_enc_getacl(struct rpc_rqst *req, __be32 *p,
                 struct nfs_getaclargs *args)
 {
         struct xdr_stream xdr;
-        struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
         struct compound_hdr hdr = {
                 .nops   = 0,
         };
-        int replen;
+        uint32_t replen;
 
         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
         encode_compound_hdr(&xdr, req, &hdr);
         encode_putfh(&xdr, args->fh, &hdr);
+        replen = hdr.replen + nfs4_fattr_bitmap_maxsz + 1;
         encode_getattr_two(&xdr, FATTR4_WORD0_ACL, 0, &hdr);
 
-        /* set up reply buffer: */
-        replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS4_dec_getacl_sz) << 2;
-        xdr_inline_pages(&req->rq_rcv_buf, replen,
+        xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
                 args->acl_pages, args->acl_pgbase, args->acl_len);
         encode_nops(&hdr);
         return 0;
@@ -2045,21 +2022,16 @@ static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, __be32 *p, struct nfs
         struct compound_hdr hdr = {
                 .nops = 0,
         };
-        struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
-        int replen;
+        uint32_t replen;
 
         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
         encode_compound_hdr(&xdr, req, &hdr);
         encode_putfh(&xdr, args->dir_fh, &hdr);
         encode_lookup(&xdr, args->name, &hdr);
+        replen = hdr.replen;    /* get the attribute into args->page */
         encode_fs_locations(&xdr, args->bitmask, &hdr);
 
-        /* set up reply
-         *   toplevel_status + OP_PUTFH + status
-         *   + OP_LOOKUP + status + OP_GETATTR + status = 7
-         */
-        replen = (RPC_REPHDRSIZE + auth->au_rslack + 7) << 2;
-        xdr_inline_pages(&req->rq_rcv_buf, replen, &args->page,
+        xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
                         0, PAGE_SIZE);
         encode_nops(&hdr);
         return 0;