nfsd4: use xdr_stream throughout compound encoding
Note this makes ADJUST_ARGS useless; we'll remove it in the following
patch.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 41c7c0a..109b5a8 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1284,7 +1284,7 @@
svcxdr_init_encode(rqstp, resp);
resp->tagp = resp->xdr.p;
/* reserve space for: taglen, tag, and opcnt */
- resp->xdr.p += 2 + XDR_QUADLEN(args->taglen);
+ xdr_reserve_space(&resp->xdr, 8 + args->taglen);
resp->taglen = args->taglen;
resp->tag = args->tag;
resp->opcnt = 0;
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 27d1e94..5064cb5 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1747,10 +1747,10 @@
}
#define RESERVE_SPACE(nbytes) do { \
- p = resp->xdr.p; \
- BUG_ON(p + XDR_QUADLEN(nbytes) > resp->xdr.end); \
+ p = xdr_reserve_space(&resp->xdr, nbytes); \
+ BUG_ON(!p); \
} while (0)
-#define ADJUST_ARGS() resp->xdr.p = p
+#define ADJUST_ARGS() WARN_ON_ONCE(p != resp->xdr.p) \
/* Encode as an array of strings the string given with components
* separated @sep, escaped with esc_enter and esc_exit.
@@ -3056,8 +3056,11 @@
read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
&maxcount);
- if (nfserr)
+ if (nfserr) {
+ xdr->p -= 2;
+ xdr->iov->iov_len -= 8;
return nfserr;
+ }
eof = (read->rd_offset + maxcount >=
read->rd_fhp->fh_dentry->d_inode->i_size);
@@ -3110,9 +3113,12 @@
*/
nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
if (nfserr == nfserr_isdir)
- return nfserr_inval;
- if (nfserr)
+ nfserr = nfserr_inval;
+ if (nfserr) {
+ xdr->p--;
+ xdr->iov->iov_len -= 4;
return nfserr;
+ }
WRITE32(maxcount);
ADJUST_ARGS();
@@ -3213,8 +3219,9 @@
return 0;
err_no_verf:
- p = savep;
- ADJUST_ARGS();
+ xdr->p = savep;
+ xdr->iov->iov_len = ((char *)resp->xdr.p)
+ - (char *)resp->xdr.buf->head[0].iov_base;
return nfserr;
}