From 0a880a28f8add9b134a26f6e058c40199a2ffbc8 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 30 Jul 2014 08:27:10 -0400 Subject: [PATCH] nfsd: Add lockdep assertions to document the nfs4_client/session locking Signed-off-by: Trond Myklebust Signed-off-by: Jeff Layton Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs4state.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index f9d077d..e7dfd4e 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -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) -- 2.7.4