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nfsd: Add lockdep assertions to document the nfs4_client/session locking 

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2014-07-30 08:27:10 -04:00 committed by J. Bruce Fields
parent 3e339f964b
commit 0a880a28f8
1 changed files with 30 additions and 0 deletions
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30
fs/nfsd/nfs4state.c
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@ -139,6 +139,10 @@ static __be32 mark_client_expired_locked(struct nfs4_client *clp)
static __be32 get_client_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (is_client_expired(clp))
return nfserr_expired;
atomic_inc(&clp->cl_refcount);
@ -179,6 +183,10 @@ renew_client(struct nfs4_client *clp)
static void put_client_renew_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (!atomic_dec_and_test(&clp->cl_refcount))
return;
if (!is_client_expired(clp))
@ -212,6 +220,9 @@ static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
static void nfsd4_put_session_locked(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
free_session(ses);
@ -1453,6 +1464,8 @@ __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
int idx;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
dump_sessionid(__func__, sessionid);
idx = hash_sessionid(sessionid);
/* Search in the appropriate list */
@ -1489,6 +1502,11 @@ out:
static void
unhash_session(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
list_del(&ses->se_hash);
spin_lock(&ses->se_client->cl_lock);
list_del(&ses->se_perclnt);
@ -1575,6 +1593,8 @@ unhash_client_locked(struct nfs4_client *clp)
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct nfsd4_session *ses;
lockdep_assert_held(&nn->client_lock);
/* Mark the client as expired! */
clp->cl_time = 0;
/* Make it invisible */
@ -1906,6 +1926,8 @@ add_to_unconfirmed(struct nfs4_client *clp)
unsigned int idhashval;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
add_clp_to_name_tree(clp, &nn->unconf_name_tree);
idhashval = clientid_hashval(clp->cl_clientid.cl_id);
@ -1919,6 +1941,8 @@ move_to_confirmed(struct nfs4_client *clp)
unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
@ -1949,6 +1973,7 @@ find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
{
struct list_head *tbl = nn->conf_id_hashtbl;
lockdep_assert_held(&nn->client_lock);
return find_client_in_id_table(tbl, clid, sessions);
}
@ -1957,6 +1982,7 @@ find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
{
struct list_head *tbl = nn->unconf_id_hashtbl;
lockdep_assert_held(&nn->client_lock);
return find_client_in_id_table(tbl, clid, sessions);
}
@ -1968,12 +1994,14 @@ static bool clp_used_exchangeid(struct nfs4_client *clp)
static struct nfs4_client *
find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
{
lockdep_assert_held(&nn->client_lock);
return find_clp_in_name_tree(name, &nn->conf_name_tree);
}
static struct nfs4_client *
find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
{
lockdep_assert_held(&nn->client_lock);
return find_clp_in_name_tree(name, &nn->unconf_name_tree);
}
@ -4907,6 +4935,8 @@ find_lockowner_str_locked(clientid_t *clid, struct xdr_netobj *owner,
unsigned int strhashval = ownerstr_hashval(owner);
struct nfs4_stateowner *so;
lockdep_assert_held(&clp->cl_lock);
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
so_strhash) {
if (so->so_is_open_owner)