NFSD: Fix bad checking of space for padding in splice read

Note that the caller has already reserved space for count and eof, so
xdr->p has already moved past them, only the padding remains.

Signed-off-by: Kinglong Mee <[email protected]>
Fixes dc97618 (nfsd4: separate splice and readv cases)
Signed-off-by: J. Bruce Fields <[email protected]>

Author: kinglongmee

fs/nfsd/nfs4xdr.c

@@ -3072,11 +3072,8 @@ static __be32 nfsd4_encode_splice_read(
 	__be32 nfserr;
 	__be32 *p = xdr->p - 2;
 
-	/*
-	 * Don't inline pages unless we know there's room for eof,
-	 * count, and possible padding:
-	 */
-	if (xdr->end - xdr->p < 3)
+	/* Make sure there will be room for padding if needed */
+	if (xdr->end - xdr->p < 1)
 		return nfserr_resource;
 
 	nfserr = nfsd_splice_read(read->rd_rqstp, file,