Commit fdec6114 authored Nov 15, 2018 by J. Bruce Fields

nfsd4: zero-length WRITE should succeed



Zero-length writes are legal; from 5661 section 18.32.3: "If the count
is zero, the WRITE will succeed and return a count of zero subject to
permissions checking".

This check is unnecessary and is causing zero-length reads to return
EINVAL.

Cc: stable@vger.kernel.org
Fixes: 3fd9557a "NFSD: Refactor the generic write vector fill helper"
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

parent 2e6e902d

fs/nfsd/nfs4proc.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -1016,8 +1016,6 @@ nfsd4_write(struct svc_rqst rqstp, struct nfsd4_compound_state cstate,

		nvecs = svc_fill_write_vector(rqstp, write->wr_pagelist,
		&write->wr_head, write->wr_buflen);
		if (!nvecs)
		return nfserr_io;
		WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));

		status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,