static inline void hlist_del(struct hlist_node *n)
{
__hlist_del(n);
//Qus. why not NULL
n->next = LIST_POISON1;
n->pprev = LIST_POISON2;
}
static inline void hlist_del_init(struct hlist_node *n)
{
if (!hlist_unhashed(n)) {
__hlist_del(n);
INIT_HLIST_NODE(n);
}
}
/*
* Caller must hold hashbucket lock for this tb with local BH disabled
*/
void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
{
if (hlist_empty(&tb->owners)) {
__hlist_del(&tb->node);
kmem_cache_free(cachep, tb);
}
}
/*
* caller must hold spinlock
*/
static
void ctx_unhash_pf(struct ptlrpc_cli_ctx *ctx, struct hlist_head *freelist)
{
assert_spin_locked(&ctx->cc_sec->ps_lock);
LASSERT(atomic_read(&ctx->cc_refcount) > 0);
LASSERT(test_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags));
LASSERT(!hlist_unhashed(&ctx->cc_cache));
clear_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags);
if (atomic_dec_and_test(&ctx->cc_refcount)) {
__hlist_del(&ctx->cc_cache);
hlist_add_head(&ctx->cc_cache, freelist);
} else {
hlist_del_init(&ctx->cc_cache);
}
}