8fa1f1c2bd
These externs belong in fs/internal.h. Rename (they are not acct-specific anymore) and move them over there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
#include <linux/fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs_pin.h>
|
|
#include "internal.h"
|
|
#include "mount.h"
|
|
|
|
static void pin_free_rcu(struct rcu_head *head)
|
|
{
|
|
kfree(container_of(head, struct fs_pin, rcu));
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(pin_lock);
|
|
|
|
void pin_put(struct fs_pin *p)
|
|
{
|
|
if (atomic_long_dec_and_test(&p->count))
|
|
call_rcu(&p->rcu, pin_free_rcu);
|
|
}
|
|
|
|
void pin_remove(struct fs_pin *pin)
|
|
{
|
|
spin_lock(&pin_lock);
|
|
hlist_del(&pin->m_list);
|
|
hlist_del(&pin->s_list);
|
|
spin_unlock(&pin_lock);
|
|
}
|
|
|
|
void pin_insert(struct fs_pin *pin, struct vfsmount *m)
|
|
{
|
|
spin_lock(&pin_lock);
|
|
hlist_add_head(&pin->s_list, &m->mnt_sb->s_pins);
|
|
hlist_add_head(&pin->m_list, &real_mount(m)->mnt_pins);
|
|
spin_unlock(&pin_lock);
|
|
}
|
|
|
|
void mnt_pin_kill(struct mount *m)
|
|
{
|
|
while (1) {
|
|
struct hlist_node *p;
|
|
struct fs_pin *pin;
|
|
rcu_read_lock();
|
|
p = ACCESS_ONCE(m->mnt_pins.first);
|
|
if (!p) {
|
|
rcu_read_unlock();
|
|
break;
|
|
}
|
|
pin = hlist_entry(p, struct fs_pin, m_list);
|
|
if (!atomic_long_inc_not_zero(&pin->count)) {
|
|
rcu_read_unlock();
|
|
cpu_relax();
|
|
continue;
|
|
}
|
|
rcu_read_unlock();
|
|
pin->kill(pin);
|
|
}
|
|
}
|
|
|
|
void sb_pin_kill(struct super_block *sb)
|
|
{
|
|
while (1) {
|
|
struct hlist_node *p;
|
|
struct fs_pin *pin;
|
|
rcu_read_lock();
|
|
p = ACCESS_ONCE(sb->s_pins.first);
|
|
if (!p) {
|
|
rcu_read_unlock();
|
|
break;
|
|
}
|
|
pin = hlist_entry(p, struct fs_pin, s_list);
|
|
if (!atomic_long_inc_not_zero(&pin->count)) {
|
|
rcu_read_unlock();
|
|
cpu_relax();
|
|
continue;
|
|
}
|
|
rcu_read_unlock();
|
|
pin->kill(pin);
|
|
}
|
|
}
|