Commit 395b9553 authored by Luis Henriques's avatar Luis Henriques Committed by Miklos Szeredi
Browse files

dcache: export shrink_dentry_list() and add new helper d_dispose_if_unused() 



Add and export a new helper d_dispose_if_unused() which is simply a wrapper
around to_shrink_list(), to add an entry to a dispose list if it's not used
anymore.

Also export shrink_dentry_list() to kill all dentries in a dispose list.

Suggested-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
Signed-off-by: default avatarLuis Henriques <luis@igalia.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 66c6a77e

fs/dcache.c

+12 −6
Original line number Diff line number Diff line
@@ -1086,6 +1086,15 @@ 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.
@@ -1096,12 +1105,8 @@ 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);

}
@@ -1141,6 +1146,7 @@ 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)

include/linux/dcache.h

+2 −0
Original line number Diff line number Diff line
@@ -268,6 +268,8 @@ 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 *);