static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
+static struct workqueue_struct *laundry_wq;
+
static bool is_session_dead(struct nfsd4_session *ses)
{
return ses->se_flags & NFS4_SESSION_DEAD;
if (is_client_expired(clp))
return nfserr_expired;
atomic_inc(&clp->cl_rpc_users);
+ clp->cl_state = NFSD4_ACTIVE;
return nfs_ok;
}
list_move_tail(&clp->cl_lru, &nn->client_lru);
clp->cl_time = ktime_get_boottime_seconds();
+ clp->cl_state = NFSD4_ACTIVE;
}
static void put_client_renew_locked(struct nfs4_client *clp)
get_clnt_odstate(odstate);
dp->dl_type = NFS4_OPEN_DELEGATE_READ;
dp->dl_retries = 1;
+ dp->dl_recalled = false;
nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
&nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
get_nfs4_file(fp);
idr_init(&clp->cl_stateids);
atomic_set(&clp->cl_rpc_users, 0);
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
+ clp->cl_state = NFSD4_ACTIVE;
+ atomic_set(&clp->cl_delegs_in_recall, 0);
INIT_LIST_HEAD(&clp->cl_idhash);
INIT_LIST_HEAD(&clp->cl_openowners);
INIT_LIST_HEAD(&clp->cl_delegations);
bool ret = false;
struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
struct nfs4_file *fp = dp->dl_stid.sc_file;
+ struct nfs4_client *clp = dp->dl_stid.sc_client;
+ struct nfsd_net *nn;
trace_nfsd_cb_recall(&dp->dl_stid);
+ dp->dl_recalled = true;
+ atomic_inc(&clp->cl_delegs_in_recall);
+ if (try_to_expire_client(clp)) {
+ nn = net_generic(clp->net, nfsd_net_id);
+ mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
+ }
+
/*
* We don't want the locks code to timeout the lease for us;
* we'll remove it ourself if a delegation isn't returned
nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
struct list_head *dispose)
{
- if (arg & F_UNLCK)
+ struct nfs4_delegation *dp = (struct nfs4_delegation *)onlist->fl_owner;
+ struct nfs4_client *clp = dp->dl_stid.sc_client;
+
+ if (arg & F_UNLCK) {
+ if (dp->dl_recalled)
+ atomic_dec(&clp->cl_delegs_in_recall);
return lease_modify(onlist, arg, dispose);
- else
+ } else
return -EAGAIN;
}
}
#endif
+/*
+ * place holder for now, no check for lock blockers yet
+ */
+static bool
+nfs4_anylock_blockers(struct nfs4_client *clp)
+{
+ if (atomic_read(&clp->cl_delegs_in_recall) ||
+ client_has_openowners(clp) ||
+ !list_empty(&clp->async_copies))
+ return true;
+ return false;
+}
+
+static void
+nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
+ struct laundry_time *lt)
+{
+ struct list_head *pos, *next;
+ struct nfs4_client *clp;
+
+ INIT_LIST_HEAD(reaplist);
+ spin_lock(&nn->client_lock);
+ list_for_each_safe(pos, next, &nn->client_lru) {
+ clp = list_entry(pos, struct nfs4_client, cl_lru);
+ if (clp->cl_state == NFSD4_EXPIRABLE)
+ goto exp_client;
+ if (!state_expired(lt, clp->cl_time))
+ break;
+ if (!atomic_read(&clp->cl_rpc_users))
+ clp->cl_state = NFSD4_COURTESY;
+ if (!client_has_state(clp) ||
+ ktime_get_boottime_seconds() >=
+ (clp->cl_time + NFSD_COURTESY_CLIENT_TIMEOUT))
+ goto exp_client;
+ if (nfs4_anylock_blockers(clp)) {
+exp_client:
+ if (!mark_client_expired_locked(clp))
+ list_add(&clp->cl_lru, reaplist);
+ }
+ }
+ spin_unlock(&nn->client_lock);
+}
+
static time64_t
nfs4_laundromat(struct nfsd_net *nn)
{
goto out;
}
nfsd4_end_grace(nn);
- INIT_LIST_HEAD(&reaplist);
spin_lock(&nn->s2s_cp_lock);
idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
_free_cpntf_state_locked(nn, cps);
}
spin_unlock(&nn->s2s_cp_lock);
-
- spin_lock(&nn->client_lock);
- list_for_each_safe(pos, next, &nn->client_lru) {
- clp = list_entry(pos, struct nfs4_client, cl_lru);
- if (!state_expired(<, clp->cl_time))
- break;
- if (mark_client_expired_locked(clp))
- continue;
- list_add(&clp->cl_lru, &reaplist);
- }
- spin_unlock(&nn->client_lock);
+ nfs4_get_client_reaplist(nn, &reaplist, <);
list_for_each_safe(pos, next, &reaplist) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
trace_nfsd_clid_purged(&clp->cl_clientid);
return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
}
-static struct workqueue_struct *laundry_wq;
static void laundromat_main(struct work_struct *);
static void
/* For recall: */
int dl_retries;
struct nfsd4_callback dl_recall;
+ bool dl_recalled;
};
#define cb_to_delegation(cb) \
#define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
/*
+ * State Meaning Where set
+ * --------------------------------------------------------------------------
+ * | NFSD4_ACTIVE | Confirmed, active | Default |
+ * |------------------- ----------------------------------------------------|
+ * | NFSD4_COURTESY | Courtesy state. | nfs4_get_client_reaplist |
+ * | | Lease/lock/share | |
+ * | | reservation conflict | |
+ * | | can cause Courtesy | |
+ * | | client to be expired | |
+ * |------------------------------------------------------------------------|
+ * | NFSD4_EXPIRABLE | Courtesy client to be| nfs4_laundromat |
+ * | | expired by Laundromat| try_to_expire_client |
+ * | | due to conflict | |
+ * |------------------------------------------------------------------------|
+ */
+enum {
+ NFSD4_ACTIVE = 0,
+ NFSD4_COURTESY,
+ NFSD4_EXPIRABLE,
+};
+
+/*
* struct nfs4_client - one per client. Clientids live here.
*
* The initial object created by an NFS client using SETCLIENTID (for NFSv4.0)
struct list_head async_copies; /* list of async copies */
spinlock_t async_lock; /* lock for async copies */
atomic_t cl_cb_inflight; /* Outstanding callbacks */
+
+ unsigned int cl_state;
+ atomic_t cl_delegs_in_recall;
};
/* struct nfs4_client_reset
extern int nfsd4_client_record_check(struct nfs4_client *clp);
extern void nfsd4_record_grace_done(struct nfsd_net *nn);
+static inline bool try_to_expire_client(struct nfs4_client *clp)
+{
+ cmpxchg(&clp->cl_state, NFSD4_COURTESY, NFSD4_EXPIRABLE);
+ return clp->cl_state == NFSD4_EXPIRABLE;
+}
#endif /* NFSD4_STATE_H */