Reduce the cl_lock trashing in destroy_lockowner. Unhash all of the
lockstateids on the lockowner's list. Put the reference under the lock
and see if it was the last one. If so, then add it to a private list
to be destroyed after we drop the lock.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 51 ++++++++++++++++++++++++++++++++++-----------------
1 file changed, 34 insertions(+), 17 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 9b342e164407..9358cbe2283d 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -983,14 +983,23 @@ static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
nfs4_free_ol_stateid(stid);
}
-static void release_lock_stateid(struct nfs4_ol_stateid *stp)
+static void unhash_lock_stateid(struct nfs4_ol_stateid *stp)
{
struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
- spin_lock(&oo->oo_owner.so_client->cl_lock);
- list_del(&stp->st_locks);
+ lockdep_assert_held(&oo->oo_owner.so_client->cl_lock);
+
+ list_del_init(&stp->st_locks);
unhash_generic_stateid(stp);
unhash_stid(&stp->st_stid);
+}
+
+static void release_lock_stateid(struct nfs4_ol_stateid *stp)
+{
+ struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
+
+ spin_lock(&oo->oo_owner.so_client->cl_lock);
+ unhash_lock_stateid(stp);
spin_unlock(&oo->oo_owner.so_client->cl_lock);
nfs4_put_stid(&stp->st_stid);
}
@@ -1004,30 +1013,38 @@ static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
list_del_init(&lo->lo_owner.so_strhash);
}
-static void release_lockowner_stateids(struct nfs4_lockowner *lo)
+static void release_lockowner(struct nfs4_lockowner *lo)
{
struct nfs4_client *clp = lo->lo_owner.so_client;
struct nfs4_ol_stateid *stp;
+ struct list_head reaplist;
- lockdep_assert_held(&clp->cl_lock);
+ INIT_LIST_HEAD(&reaplist);
+ spin_lock(&clp->cl_lock);
+ unhash_lockowner_locked(lo);
while (!list_empty(&lo->lo_owner.so_stateids)) {
stp = list_first_entry(&lo->lo_owner.so_stateids,
struct nfs4_ol_stateid, st_perstateowner);
- spin_unlock(&clp->cl_lock);
- release_lock_stateid(stp);
- spin_lock(&clp->cl_lock);
+ unhash_lock_stateid(stp);
+ /*
+ * We now know that no new references can be added to the
+ * stateid. If ours is the last one, finish the unhashing
+ * and put it on the list to be reaped.
+ */
+ if (atomic_dec_and_test(&stp->st_stid.sc_count)) {
+ idr_remove(&clp->cl_stateids,
+ stp->st_stid.sc_stateid.si_opaque.so_id);
+ list_add(&stp->st_locks, &reaplist);
+ }
}
-}
-
-static void release_lockowner(struct nfs4_lockowner *lo)
-{
- struct nfs4_client *clp = lo->lo_owner.so_client;
-
- spin_lock(&clp->cl_lock);
- unhash_lockowner_locked(lo);
- release_lockowner_stateids(lo);
spin_unlock(&clp->cl_lock);
+ while (!list_empty(&reaplist)) {
+ stp = list_first_entry(&reaplist, struct nfs4_ol_stateid,
+ st_locks);
+ list_del(&stp->st_locks);
+ stp->st_stid.sc_free(&stp->st_stid);
+ }
nfs4_put_stateowner(&lo->lo_owner);
}
--
1.9.3
--
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