Commit eb2c50da authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFS: Ensure O_DIRECT reports an error if the bytes read/written is 0 



If the attempt to resend the I/O results in no bytes being read/written,
we must ensure that we report the error.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
Fixes: 0a00b77b ("nfs: mirroring support for direct io")
Cc: stable@vger.kernel.org # v3.20+
parent f4340e93

fs/nfs/direct.c

+18 −9
Original line number Diff line number Diff line
@@ -401,15 +401,21 @@ static void nfs_direct_read_completion(struct nfs_pgio_header *hdr) 
	unsigned long bytes = 0;

	struct nfs_direct_req *dreq = hdr->dreq;



	if (test_bit(NFS_IOHDR_REDO, &hdr->flags))

		goto out_put;



	spin_lock(&dreq->lock);

	if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && (hdr->good_bytes == 0))

	if (test_bit(NFS_IOHDR_ERROR, &hdr->flags))

		dreq->error = hdr->error;

	else



	if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) {

		spin_unlock(&dreq->lock);

		goto out_put;

	}



	if (hdr->good_bytes != 0)

		nfs_direct_good_bytes(dreq, hdr);



	if (test_bit(NFS_IOHDR_EOF, &hdr->flags))

		dreq->error = 0;



	spin_unlock(&dreq->lock);



	while (!list_empty(&hdr->pages)) {
@@ -782,16 +788,19 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr) 
	bool request_commit = false;

	struct nfs_page *req = nfs_list_entry(hdr->pages.next);



	if (test_bit(NFS_IOHDR_REDO, &hdr->flags))

		goto out_put;



	nfs_init_cinfo_from_dreq(&cinfo, dreq);



	spin_lock(&dreq->lock);



	if (test_bit(NFS_IOHDR_ERROR, &hdr->flags))

		dreq->error = hdr->error;

	if (dreq->error == 0) {



	if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) {

		spin_unlock(&dreq->lock);

		goto out_put;

	}



	if (hdr->good_bytes != 0) {

		nfs_direct_good_bytes(dreq, hdr);

		if (nfs_write_need_commit(hdr)) {

			if (dreq->flags == NFS_ODIRECT_RESCHED_WRITES)

fs/nfs/pagelist.c

+1 −0
Original line number Diff line number Diff line
@@ -1266,6 +1266,7 @@ int nfs_pageio_resend(struct nfs_pageio_descriptor *desc, 
	if (!list_empty(&pages)) {

		int err = desc->pg_error < 0 ? desc->pg_error : -EIO;

		hdr->completion_ops->error_cleanup(&pages, err);

		nfs_set_pgio_error(hdr, err, hdr->io_start);

		return err;

	}

	return 0;