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[rlc-10] dcache: export shrink_dentry_list() and add new helper d_dispose_if_u… #897

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[rlc-10] dcache: export shrink_dentry_list() and add new helper d_dispose_if_u… #897

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18 changes: 12 additions & 6 deletions fs/dcache.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1032,6 +1032,15 @@ struct dentry *d_find_alias_rcu(struct inode *inode)
return de;
}

void d_dispose_if_unused(struct dentry *dentry, struct list_head *dispose)
{
spin_lock(&dentry->d_lock);
if (!dentry->d_lockref.count)
to_shrink_list(dentry, dispose);
spin_unlock(&dentry->d_lock);
}
EXPORT_SYMBOL(d_dispose_if_unused);

/*
* Try to kill dentries associated with this inode.
* WARNING: you must own a reference to inode.
Expand All @@ -1042,12 +1051,8 @@ void d_prune_aliases(struct inode *inode)
struct dentry *dentry;

spin_lock(&inode->i_lock);
hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
spin_lock(&dentry->d_lock);
if (!dentry->d_lockref.count)
to_shrink_list(dentry, &dispose);
spin_unlock(&dentry->d_lock);
}
hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias)
d_dispose_if_unused(dentry, &dispose);
spin_unlock(&inode->i_lock);
shrink_dentry_list(&dispose);
}
Expand Down Expand Up @@ -1087,6 +1092,7 @@ void shrink_dentry_list(struct list_head *list)
shrink_kill(dentry);
}
}
EXPORT_SYMBOL(shrink_dentry_list);

static enum lru_status dentry_lru_isolate(struct list_head *item,
struct list_lru_one *lru, void *arg)
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2 changes: 2 additions & 0 deletions include/linux/dcache.h
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Original file line number Diff line number Diff line change
Expand Up @@ -256,6 +256,8 @@ extern void d_tmpfile(struct file *, struct inode *);

extern struct dentry *d_find_alias(struct inode *);
extern void d_prune_aliases(struct inode *);
extern void d_dispose_if_unused(struct dentry *, struct list_head *);
extern void shrink_dentry_list(struct list_head *);

extern struct dentry *d_find_alias_rcu(struct inode *);

Expand Down