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Subject[PATCH 3.11 229/272] NFSv4: Fix state reference counting in _nfs4_opendata_reclaim_to_nfs4_state
Date
3.11.10.1 -stable review patch.  If anyone has any objections, please let me know.

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

From: Trond Myklebust <Trond.Myklebust@netapp.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@netapp.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
fs/nfs/nfs4proc.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 84c6225..9960a5b 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1236,11 +1236,6 @@ _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
goto err;
}

- 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;
@@ -1251,6 +1246,7 @@ _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
nfs4_opendata_check_deleg(data, state);
update_open_stateid(state, &data->o_res.stateid, NULL,
data->o_arg.fmode);
+ atomic_inc(&state->count);

return state;
err:
--
1.8.3.2


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