linux-kernel - [PATCH 3.12 064/116] NFSv4: Fix state reference counting in _nfs4_opendata_reclaim_to_nfs4

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Message-Id: <20131127005741.371402624@linuxfoundation.org>
Date:	Tue, 26 Nov 2013 16:57:17 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: [PATCH 3.12 064/116] NFSv4: Fix state reference counting in _nfs4_opendata_reclaim_to_nfs4_state

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit d49f042aeec99c5f87160bb52dd52088b1051311 upstream.

Currently, if the call to nfs_refresh_inode fails, then we end up leaking
a reference count, due to the call to nfs4_get_open_state.
While we're at it, replace nfs4_get_open_state with a simple call to
atomic_inc(); there is no need to do a full lookup of the struct nfs_state
since it is passed as an argument in the struct nfs4_opendata, and
is already assigned to the variable 'state'.

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/nfs4proc.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1326,11 +1326,6 @@ _nfs4_opendata_reclaim_to_nfs4_state(str
 		goto update;
 	}
 
-	ret = -ENOMEM;
-	state = nfs4_get_open_state(inode, data->owner);
-	if (state == NULL)
-		goto err;
-
 	ret = nfs_refresh_inode(inode, &data->f_attr);
 	if (ret)
 		goto err;
@@ -1342,6 +1337,7 @@ _nfs4_opendata_reclaim_to_nfs4_state(str
 update:
 	update_open_stateid(state, &data->o_res.stateid, NULL,
 			    data->o_arg.fmode);
+	atomic_inc(&state->count);
 
 	return state;
 err:


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