linux-kernel - [PATCH] [42/223] NFSv4: Fix open recovery

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Message-Id: <20101212234539.188ABB27BF@basil.firstfloor.org>
Date:	Mon, 13 Dec 2010 00:45:39 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	Trond.Myklebust@...app.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [42/223] NFSv4: Fix open recovery

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Trond Myklebust <Trond.Myklebust@...app.com>

commit b0ed9dbc24f1fd912b2dd08b995153cafc1d5b1c upstream.

NFSv4 open recovery is currently broken: since we do not clear the
state->flags states before attempting recovery, we end up with the
'can_open_cached()' function triggering. This again leads to no OPEN call
being put on the wire.

Reported-by: Sachin Prabhu <sprabhu@...hat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/nfs/nfs4proc.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux/fs/nfs/nfs4proc.c
===================================================================
--- linux.orig/fs/nfs/nfs4proc.c
+++ linux/fs/nfs/nfs4proc.c
@@ -1099,6 +1099,7 @@ static int nfs4_open_recover(struct nfs4
 	clear_bit(NFS_DELEGATED_STATE, &state->flags);
 	smp_rmb();
 	if (state->n_rdwr != 0) {
+		clear_bit(NFS_O_RDWR_STATE, &state->flags);
 		ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 		if (ret != 0)
 			return ret;
@@ -1106,6 +1107,7 @@ static int nfs4_open_recover(struct nfs4
 			return -ESTALE;
 	}
 	if (state->n_wronly != 0) {
+		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
 		ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 		if (ret != 0)
 			return ret;
@@ -1113,6 +1115,7 @@ static int nfs4_open_recover(struct nfs4
 			return -ESTALE;
 	}
 	if (state->n_rdonly != 0) {
+		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
 		ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 		if (ret != 0)
 			return ret;
--
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