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/*
* Copyright (C) 2005-2015 Junjiro R. Okajima
*
* This program, aufs is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* simple list protected by a spinlock
*/
#ifndef __AUFS_SPL_H__
#define __AUFS_SPL_H__
#ifdef __KERNEL__
struct au_splhead {
spinlock_t spin;
struct list_head head;
};
static inline void au_spl_init(struct au_splhead *spl)
{
spin_lock_init(&spl->spin);
INIT_LIST_HEAD(&spl->head);
}
static inline void au_spl_add(struct list_head *list, struct au_splhead *spl)
{
spin_lock(&spl->spin);
list_add(list, &spl->head);
spin_unlock(&spl->spin);
}
static inline void au_spl_del(struct list_head *list, struct au_splhead *spl)
{
spin_lock(&spl->spin);
list_del(list);
spin_unlock(&spl->spin);
}
static inline void au_spl_del_rcu(struct list_head *list,
struct au_splhead *spl)
{
spin_lock(&spl->spin);
list_del_rcu(list);
spin_unlock(&spl->spin);
}
/* ---------------------------------------------------------------------- */
struct au_sphlhead {
spinlock_t spin;
struct hlist_head head;
};
static inline void au_sphl_init(struct au_sphlhead *sphl)
{
spin_lock_init(&sphl->spin);
INIT_HLIST_HEAD(&sphl->head);
}
static inline void au_sphl_add(struct hlist_node *hlist,
struct au_sphlhead *sphl)
{
spin_lock(&sphl->spin);
hlist_add_head(hlist, &sphl->head);
spin_unlock(&sphl->spin);
}
static inline void au_sphl_del(struct hlist_node *hlist,
struct au_sphlhead *sphl)
{
spin_lock(&sphl->spin);
hlist_del(hlist);
spin_unlock(&sphl->spin);
}
static inline void au_sphl_del_rcu(struct hlist_node *hlist,
struct au_sphlhead *sphl)
{
spin_lock(&sphl->spin);
hlist_del_rcu(hlist);
spin_unlock(&sphl->spin);
}
static inline unsigned long au_sphl_count(struct au_sphlhead *sphl)
{
unsigned long cnt;
struct hlist_node *pos;
cnt = 0;
spin_lock(&sphl->spin);
hlist_for_each(pos, &sphl->head)
cnt++;
spin_unlock(&sphl->spin);
return cnt;
}
#endif /* __KERNEL__ */
#endif /* __AUFS_SPL_H__ */
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