NFSD: Update the NFSv2 READDIR entry encoder to use struct xdr_stream

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

1 files changed, 19 insertions, 7 deletions

diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index 1acff9f4aaf1..86d438fbd576 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -559,14 +559,27 @@ static void nfsd_init_dirlist_pages(struct svc_rqst *rqstp,
 				    struct nfsd_readdirres *resp,
 				    int count)
 {
+	struct xdr_buf *buf = &resp->dirlist;
+	struct xdr_stream *xdr = &resp->xdr;
+
 	count = min_t(u32, count, PAGE_SIZE);
 
-	/* Convert byte count to number of words (i.e. >> 2),
-	 * and reserve room for the NULL ptr & eof flag (-2 words) */
-	resp->buflen = (count >> 2) - 2;
+	memset(buf, 0, sizeof(*buf));
 
-	resp->buffer = page_address(*rqstp->rq_next_page);
+	/* Reserve room for the NULL ptr & eof flag (-2 words) */
+	buf->buflen = count - sizeof(__be32) * 2;
+	buf->pages = rqstp->rq_next_page;
 	rqstp->rq_next_page++;
+
+	/* This is xdr_init_encode(), but it assumes that
+	 * the head kvec has already been consumed. */
+	xdr_set_scratch_buffer(xdr, NULL, 0);
+	xdr->buf = buf;
+	xdr->page_ptr = buf->pages;
+	xdr->iov = NULL;
+	xdr->p = page_address(*buf->pages);
+	xdr->end = xdr->p + (PAGE_SIZE >> 2);
+	xdr->rqst = NULL;
 }
 
 /*
@@ -585,12 +598,11 @@ nfsd_proc_readdir(struct svc_rqst *rqstp)
 
 	nfsd_init_dirlist_pages(rqstp, resp, argp->count);
 
-	resp->offset = NULL;
 	resp->common.err = nfs_ok;
-	/* Read directory and encode entries on the fly */
+	resp->cookie_offset = 0;
 	offset = argp->cookie;
 	resp->status = nfsd_readdir(rqstp, &argp->fh, &offset,
-				    &resp->common, nfssvc_encode_entry);
+				    &resp->common, nfs2svc_encode_entry);
 	nfssvc_encode_nfscookie(resp, offset);
 
 	fh_put(&argp->fh);