NFSD: Update the NFSv2 READ argument decoder to use struct xdr_stream

The code that sets up rq_vec is refactored so that it is now
adjacent to the nfsd_read() call site where it is used.

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

1 files changed, 18 insertions, 14 deletions

diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index b9bc162a5c77..814762793f9c 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -171,32 +171,36 @@ nfsd_proc_read(struct svc_rqst *rqstp)
 {
 	struct nfsd_readargs *argp = rqstp->rq_argp;
 	struct nfsd_readres *resp = rqstp->rq_resp;
+	unsigned int len;
 	u32 eof;
+	int v;
 
 	dprintk("nfsd: READ    %s %d bytes at %d\n",
 		SVCFH_fmt(&argp->fh),
 		argp->count, argp->offset);
 
+	argp->count = min_t(u32, argp->count, NFSSVC_MAXBLKSIZE_V2);
+
+	v = 0;
+	len = argp->count;
+	while (len > 0) {
+		struct page *page = *(rqstp->rq_next_page++);
+
+		rqstp->rq_vec[v].iov_base = page_address(page);
+		rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
+		len -= rqstp->rq_vec[v].iov_len;
+		v++;
+	}
+
 	/* Obtain buffer pointer for payload. 19 is 1 word for
 	 * status, 17 words for fattr, and 1 word for the byte count.
 	 */
-
-	if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
-		char buf[RPC_MAX_ADDRBUFLEN];
-		printk(KERN_NOTICE
-			"oversized read request from %s (%d bytes)\n",
-				svc_print_addr(rqstp, buf, sizeof(buf)),
-				argp->count);
-		argp->count = NFSSVC_MAXBLKSIZE_V2;
-	}
 	svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 
 	resp->count = argp->count;
-	resp->status = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
-				 argp->offset,
-				 rqstp->rq_vec, argp->vlen,
-				 &resp->count,
-				 &eof);
+	fh_copy(&resp->fh, &argp->fh);
+	resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
+				 rqstp->rq_vec, v, &resp->count, &eof);
 	if (resp->status == nfs_ok)
 		resp->status = fh_getattr(&resp->fh, &resp->stat);
 	else if (resp->status == nfserr_jukebox)