Commit ae55e59d authored May 22, 2018 by Trond Myklebust

pnfs: Don't release the sequence slot until we've processed layoutget on open

If the server recalls the layout that was just handed out, we risk hitting
a race as described in RFC5661 Section 2.10.6.3 unless we ensure that we
release the sequence slot after processing the LAYOUTGET operation that
was sent as part of the OPEN compound.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

parent 32f1c28f

fs/nfs/nfs4proc.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2789,7 +2789,7 @@ static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
		if (ret != 0)
		goto out;

		state = nfs4_opendata_to_nfs4_state(opendata);
		state = _nfs4_opendata_to_nfs4_state(opendata);
		ret = PTR_ERR(state);
		if (IS_ERR(state))
		goto out;
		@@ -2828,6 +2828,7 @@ static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
		}

		out:
		nfs4_sequence_free_slot(&opendata->o_res.seq_res);
		return ret;
		}