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knfsd: don't shutdown callbacks until nfsv4 client is freed

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If a callback still holds a reference on the client, then it may be
about to perform an rpc call, so it isn't safe to call rpc_shutdown().
(Though rpc_shutdown() does wait for any outstanding rpc's, it can't
know if a new rpc is about to be issued with that client.)

So, wait to shutdown the rpc_client until the reference count on the
client has gone to zero.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2007-09-12 08:43:59 -04:00
parent 0272e1fd9f
commit 1b1a9b3163
1 changed files with 13 additions and 14 deletions
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27
fs/nfsd/nfs4state.c
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@ -358,9 +358,22 @@ alloc_client(struct xdr_netobj name)
return clp;
}
static void
shutdown_callback_client(struct nfs4_client *clp)
{
struct rpc_clnt *clnt = clp->cl_callback.cb_client;
/* shutdown rpc client, ending any outstanding recall rpcs */
if (clnt) {
clp->cl_callback.cb_client = NULL;
rpc_shutdown_client(clnt);
}
}
static inline void
free_client(struct nfs4_client *clp)
{
shutdown_callback_client(clp);
if (clp->cl_cred.cr_group_info)
put_group_info(clp->cl_cred.cr_group_info);
kfree(clp->cl_name.data);
@ -374,18 +387,6 @@ put_nfs4_client(struct nfs4_client *clp)
free_client(clp);
}
static void
shutdown_callback_client(struct nfs4_client *clp)
{
struct rpc_clnt *clnt = clp->cl_callback.cb_client;
/* shutdown rpc client, ending any outstanding recall rpcs */
if (clnt) {
clp->cl_callback.cb_client = NULL;
rpc_shutdown_client(clnt);
}
}
static void
expire_client(struct nfs4_client *clp)
{
@ -396,8 +397,6 @@ expire_client(struct nfs4_client *clp)
dprintk("NFSD: expire_client cl_count %d\n",
atomic_read(&clp->cl_count));
shutdown_callback_client(clp);
INIT_LIST_HEAD(&reaplist);
spin_lock(&recall_lock);
while (!list_empty(&clp->cl_delegations)) {