}
/*
- * dentry_lru_(add|add_tail|del|del_init) must be called with dcache_lock held.
+ * dentry_lru_(add|del|move_tail) must be called with dcache_lock held.
*/
static void dentry_lru_add(struct dentry *dentry)
{
- list_add(&dentry->d_lru, &dentry->d_sb->s_dentry_lru);
- dentry->d_sb->s_nr_dentry_unused++;
- percpu_counter_inc(&nr_dentry_unused);
-}
-
-static void dentry_lru_add_tail(struct dentry *dentry)
-{
- list_add_tail(&dentry->d_lru, &dentry->d_sb->s_dentry_lru);
- dentry->d_sb->s_nr_dentry_unused++;
- percpu_counter_inc(&nr_dentry_unused);
+ if (list_empty(&dentry->d_lru)) {
+ list_add(&dentry->d_lru, &dentry->d_sb->s_dentry_lru);
+ dentry->d_sb->s_nr_dentry_unused++;
+ percpu_counter_inc(&nr_dentry_unused);
+ }
}
static void dentry_lru_del(struct dentry *dentry)
{
if (!list_empty(&dentry->d_lru)) {
- list_del(&dentry->d_lru);
+ list_del_init(&dentry->d_lru);
dentry->d_sb->s_nr_dentry_unused--;
percpu_counter_dec(&nr_dentry_unused);
}
}
-static void dentry_lru_del_init(struct dentry *dentry)
+static void dentry_lru_move_tail(struct dentry *dentry)
{
- if (likely(!list_empty(&dentry->d_lru))) {
- list_del_init(&dentry->d_lru);
- dentry->d_sb->s_nr_dentry_unused--;
- percpu_counter_dec(&nr_dentry_unused);
+ if (list_empty(&dentry->d_lru)) {
+ list_add_tail(&dentry->d_lru, &dentry->d_sb->s_dentry_lru);
+ dentry->d_sb->s_nr_dentry_unused++;
+ percpu_counter_inc(&nr_dentry_unused);
+ } else {
+ list_move_tail(&dentry->d_lru, &dentry->d_sb->s_dentry_lru);
}
}
/* Otherwise leave it cached and ensure it's on the LRU */
dentry->d_flags |= DCACHE_REFERENCED;
- if (list_empty(&dentry->d_lru))
- dentry_lru_add(dentry);
+ dentry_lru_add(dentry);
spin_unlock(&dentry->d_lock);
spin_unlock(&dcache_lock);
static inline struct dentry * __dget_locked(struct dentry *dentry)
{
atomic_inc(&dentry->d_count);
- dentry_lru_del_init(dentry);
+ dentry_lru_del(dentry);
return dentry;
}
if (dentry->d_op && dentry->d_op->d_delete)
dentry->d_op->d_delete(dentry);
- dentry_lru_del_init(dentry);
+ dentry_lru_del(dentry);
__d_drop(dentry);
dentry = d_kill(dentry);
spin_lock(&dcache_lock);
while (!list_empty(list)) {
dentry = list_entry(list->prev, struct dentry, d_lru);
- dentry_lru_del_init(dentry);
+ dentry_lru_del(dentry);
/*
* We found an inuse dentry which was not removed from
/* detach this root from the system */
spin_lock(&dcache_lock);
- dentry_lru_del_init(dentry);
+ dentry_lru_del(dentry);
__d_drop(dentry);
spin_unlock(&dcache_lock);
spin_lock(&dcache_lock);
list_for_each_entry(loop, &dentry->d_subdirs,
d_u.d_child) {
- dentry_lru_del_init(loop);
+ dentry_lru_del(loop);
__d_drop(loop);
cond_resched_lock(&dcache_lock);
}
struct dentry *dentry = list_entry(tmp, struct dentry, d_u.d_child);
next = tmp->next;
- dentry_lru_del_init(dentry);
/*
* move only zero ref count dentries to the end
* of the unused list for prune_dcache
*/
if (!atomic_read(&dentry->d_count)) {
- dentry_lru_add_tail(dentry);
+ dentry_lru_move_tail(dentry);
found++;
+ } else {
+ dentry_lru_del(dentry);
}
/*
* This is used by ncpfs in its readdir implementation.
* Zero is returned in the dentry is invalid.
*/
-
-int d_validate(struct dentry *dentry, struct dentry *dparent)
+int d_validate(struct dentry *dentry, struct dentry *parent)
{
- struct hlist_head *base;
- struct hlist_node *lhp;
+ struct hlist_head *head = d_hash(parent, dentry->d_name.hash);
+ struct hlist_node *node;
+ struct dentry *d;
/* Check whether the ptr might be valid at all.. */
if (!kmem_ptr_validate(dentry_cache, dentry))
- goto out;
-
- if (dentry->d_parent != dparent)
- goto out;
+ return 0;
+ if (dentry->d_parent != parent)
+ return 0;
- spin_lock(&dcache_lock);
- base = d_hash(dparent, dentry->d_name.hash);
- hlist_for_each(lhp,base) {
- /* hlist_for_each_entry_rcu() not required for d_hash list
- * as it is parsed under dcache_lock
- */
- if (dentry == hlist_entry(lhp, struct dentry, d_hash)) {
- __dget_locked(dentry);
- spin_unlock(&dcache_lock);
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(d, node, head, d_hash) {
+ if (d == dentry) {
+ dget(dentry);
return 1;
}
}
- spin_unlock(&dcache_lock);
-out:
+ rcu_read_unlock();
return 0;
}
EXPORT_SYMBOL(d_validate);