The delegation shrinker is scheduled to run on every shrinker's
'count' callback. It scans the client list and sends the
courtesy CB_RECALL_ANY to the clients that hold delegations.
To avoid flooding the clients with CB_RECALL_ANY requests, the
delegation shrinker is scheduled to run after a 5 seconds delay.
Signed-off-by: Dai Ngo <dai.ngo@xxxxxxxxxx>
---
fs/nfsd/netns.h | 3 ++
fs/nfsd/nfs4state.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++-
fs/nfsd/state.h | 8 ++++
3 files changed, 125 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 8c854ba3285b..394a05fb46d8 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -196,6 +196,9 @@ struct nfsd_net {
atomic_t nfsd_courtesy_clients;
struct shrinker nfsd_client_shrinker;
struct delayed_work nfsd_shrinker_work;
+
+ struct shrinker nfsd_deleg_shrinker;
+ struct delayed_work nfsd_deleg_shrinker_work;
};
/* Simple check to find out if a given net was properly initialized */
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 4e718500a00c..813cdb67b370 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2131,6 +2131,7 @@ static void __free_client(struct kref *k)
kfree(clp->cl_nii_domain.data);
kfree(clp->cl_nii_name.data);
idr_destroy(&clp->cl_stateids);
+ kfree(clp->cl_ra);
kmem_cache_free(client_slab, clp);
}
@@ -2854,6 +2855,36 @@ static const struct tree_descr client_files[] = {
[3] = {""},
};
+static int
+nfsd4_cb_recall_any_done(struct nfsd4_callback *cb,
+ struct rpc_task *task)
+{
+ switch (task->tk_status) {
+ case -NFS4ERR_DELAY:
+ rpc_delay(task, 2 * HZ);
+ return 0;
+ default:
+ return 1;
+ }
+}
+
+static void
+nfsd4_cb_recall_any_release(struct nfsd4_callback *cb)
+{
+ struct nfs4_client *clp = cb->cb_clp;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ spin_lock(&nn->client_lock);
+ clear_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
+ put_client_renew_locked(clp);
+ spin_unlock(&nn->client_lock);
+}
+
+static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = {
+ .done = nfsd4_cb_recall_any_done,
+ .release = nfsd4_cb_recall_any_release,
+};
+
static struct nfs4_client *create_client(struct xdr_netobj name,
struct svc_rqst *rqstp, nfs4_verifier *verf)
{
@@ -2891,6 +2922,14 @@ static struct nfs4_client *create_client(struct xdr_netobj name,
free_client(clp);
return NULL;
}
+ clp->cl_ra = kzalloc(sizeof(*clp->cl_ra), GFP_KERNEL);
+ if (!clp->cl_ra) {
+ free_client(clp);
+ return NULL;
+ }
+ clp->cl_ra_time = 0;
+ nfsd4_init_cb(&clp->cl_ra->ra_cb, clp, &nfsd4_cb_recall_any_ops,
+ NFSPROC4_CLNT_CB_RECALL_ANY);
return clp;
}
@@ -4365,11 +4404,32 @@ nfsd_courtesy_client_scan(struct shrinker *shrink, struct shrink_control *sc)
return SHRINK_STOP;
}
+static unsigned long
+nfsd_deleg_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
+{
+ unsigned long cnt;
+ struct nfsd_net *nn = container_of(shrink,
+ struct nfsd_net, nfsd_deleg_shrinker);
+
+ cnt = atomic_long_read(&num_delegations);
+ if (cnt)
+ mod_delayed_work(laundry_wq,
+ &nn->nfsd_deleg_shrinker_work, 0);
+ return cnt;
+}
+
+static unsigned long
+nfsd_deleg_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
+{
+ return SHRINK_STOP;
+}
+
int
nfsd4_init_leases_net(struct nfsd_net *nn)
{
struct sysinfo si;
u64 max_clients;
+ int retval;
nn->nfsd4_lease = 90; /* default lease time */
nn->nfsd4_grace = 90;
@@ -4390,13 +4450,24 @@ nfsd4_init_leases_net(struct nfsd_net *nn)
nn->nfsd_client_shrinker.scan_objects = nfsd_courtesy_client_scan;
nn->nfsd_client_shrinker.count_objects = nfsd_courtesy_client_count;
nn->nfsd_client_shrinker.seeks = DEFAULT_SEEKS;
- return register_shrinker(&nn->nfsd_client_shrinker, "nfsd-client");
+ retval = register_shrinker(&nn->nfsd_client_shrinker, "nfsd-client");
+ if (retval)
+ return retval;
+ nn->nfsd_deleg_shrinker.scan_objects = nfsd_deleg_shrinker_scan;
+ nn->nfsd_deleg_shrinker.count_objects = nfsd_deleg_shrinker_count;
+ nn->nfsd_deleg_shrinker.seeks = DEFAULT_SEEKS;
+ retval = register_shrinker(&nn->nfsd_deleg_shrinker, "nfsd-delegation");
+ if (retval)
+ unregister_shrinker(&nn->nfsd_client_shrinker);
+ return retval;
+
}
void
nfsd4_leases_net_shutdown(struct nfsd_net *nn)
{
unregister_shrinker(&nn->nfsd_client_shrinker);
+ unregister_shrinker(&nn->nfsd_deleg_shrinker);
}
static void init_nfs4_replay(struct nfs4_replay *rp)
@@ -6135,6 +6206,47 @@ courtesy_client_reaper(struct work_struct *reaper)
nfs4_process_client_reaplist(&reaplist);
}
+static void
+deleg_reaper(struct work_struct *deleg_work)
+{
+ struct list_head *pos, *next;
+ struct nfs4_client *clp;
+ struct list_head cblist;
+ struct delayed_work *dwork = to_delayed_work(deleg_work);
+ struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
+ nfsd_deleg_shrinker_work);
+
+ INIT_LIST_HEAD(&cblist);
+ 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_ACTIVE ||
+ list_empty(&clp->cl_delegations) ||
+ atomic_read(&clp->cl_delegs_in_recall) ||
+ test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags) ||
+ (ktime_get_boottime_seconds() -
+ clp->cl_ra_time < 5)) {
+ continue;
+ }
+ list_add(&clp->cl_ra_cblist, &cblist);
+
+ /* release in nfsd4_cb_recall_any_release */
+ atomic_inc(&clp->cl_rpc_users);
+ set_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
+ clp->cl_ra_time = ktime_get_boottime_seconds();
+ }
+ spin_unlock(&nn->client_lock);
+ list_for_each_safe(pos, next, &cblist) {
+ clp = list_entry(pos, struct nfs4_client, cl_ra_cblist);
+ list_del_init(&clp->cl_ra_cblist);
+ clp->cl_ra->ra_keep = 0;
+ clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG) |
+ BIT(RCA4_TYPE_MASK_WDATA_DLG);
+ nfsd4_run_cb(&clp->cl_ra->ra_cb);
+ }
+
+}
+
static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
{
if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
@@ -7958,6 +8070,7 @@ static int nfs4_state_create_net(struct net *net)
INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
INIT_DELAYED_WORK(&nn->nfsd_shrinker_work, courtesy_client_reaper);
+ INIT_DELAYED_WORK(&nn->nfsd_deleg_shrinker_work, deleg_reaper);
get_net(net);
return 0;
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 6b33cbbe76d3..12ce9792c5b6 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -368,6 +368,7 @@ struct nfs4_client {
#define NFSD4_CLIENT_UPCALL_LOCK (5) /* upcall serialization */
#define NFSD4_CLIENT_CB_FLAG_MASK (1 << NFSD4_CLIENT_CB_UPDATE | \
1 << NFSD4_CLIENT_CB_KILL)
+#define NFSD4_CLIENT_CB_RECALL_ANY (6)
unsigned long cl_flags;
const struct cred *cl_cb_cred;
struct rpc_clnt *cl_cb_client;
@@ -411,6 +412,10 @@ struct nfs4_client {
unsigned int cl_state;
atomic_t cl_delegs_in_recall;
+
+ struct nfsd4_cb_recall_any *cl_ra;
+ time64_t cl_ra_time;
+ struct list_head cl_ra_cblist;
};
/* struct nfs4_client_reset
@@ -642,6 +647,9 @@ enum nfsd4_cb_op {
NFSPROC4_CLNT_CB_RECALL_ANY,
};
+#define RCA4_TYPE_MASK_RDATA_DLG 0
+#define RCA4_TYPE_MASK_WDATA_DLG 1
+
/* Returns true iff a is later than b: */
static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b)
{
--
2.9.5
