Commit 1b8d97b0 authored Jan 16, 2018 by J. Bruce Fields Committed by Trond Myklebust Jan 16, 2018

NFS: commit direct writes even if they fail partially



If some of the WRITE calls making up an O_DIRECT write syscall fail,
we neglect to commit, even if some of the WRITEs succeed.

We also depend on the commit code to free the reference count on the
nfs_page taken in the "if (request_commit)" case at the end of
nfs_direct_write_completion().  The problem was originally noticed
because ENOSPC's encountered partway through a write would result in a
closed file being sillyrenamed when it should have been unlinked.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

parent f96adf1e

fs/nfs/direct.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -775,10 +775,8 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr)

		spin_lock(&dreq->lock);

		if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) {
		dreq->flags = 0;
		if (test_bit(NFS_IOHDR_ERROR, &hdr->flags))
		dreq->error = hdr->error;
		}
		if (dreq->error == 0) {
		nfs_direct_good_bytes(dreq, hdr);
		if (nfs_write_need_commit(hdr)) {