On Mon, Oct 29, 2012 at 12:30:45PM +0800, zwu.kernel@xxxxxxxxx wrote:
> --- a/fs/hot_tracking.c
> +++ b/fs/hot_tracking.c
> +struct hot_inode_item
> +*hot_inode_item_find(struct hot_info *root, u64 ino)
> +{
> + struct hot_inode_item *he;
> + int ret;
> +
> +again:
> + spin_lock(&root->lock);
> + he = radix_tree_lookup(&root->hot_inode_tree, ino);
> + if (he) {
> + kref_get(&he->hot_inode.refs);
> + spin_unlock(&root->lock);
> + return he;
> + }
> + spin_unlock(&root->lock);
> +
> + he = kmem_cache_zalloc(hot_inode_item_cachep,
> + GFP_KERNEL | GFP_NOFS);
> + if (!he)
> + return ERR_PTR(-ENOMEM);
> +
> + hot_inode_item_init(he, ino, &root->hot_inode_tree);
> +
> + ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
> + if (ret) {
> + kmem_cache_free(hot_inode_item_cachep, he);
radix_tree_preload_end()
> + return ERR_PTR(ret);
> + }
> +
> + spin_lock(&root->lock);
> + ret = radix_tree_insert(&root->hot_inode_tree, ino, he);
> + if (ret == -EEXIST) {
> + kmem_cache_free(hot_inode_item_cachep, he);
> + spin_unlock(&root->lock);
> + radix_tree_preload_end();
> + goto again;
> + }
> + spin_unlock(&root->lock);
> + radix_tree_preload_end();
> +
> + kref_get(&he->hot_inode.refs);
> + return he;
> +}
> +EXPORT_SYMBOL_GPL(hot_inode_item_find);
> +
> +static struct hot_range_item
> +*hot_range_item_find(struct hot_inode_item *he,
> + u32 start)
> +{
> + struct hot_range_item *hr;
> + int ret;
> +
> +again:
> + spin_lock(&he->lock);
> + hr = radix_tree_lookup(&he->hot_range_tree, start);
> + if (hr) {
> + kref_get(&hr->hot_range.refs);
> + spin_unlock(&he->lock);
> + return hr;
> + }
> + spin_unlock(&he->lock);
> +
> + hr = kmem_cache_zalloc(hot_range_item_cachep,
> + GFP_KERNEL | GFP_NOFS);
> + if (!hr)
> + return ERR_PTR(-ENOMEM);
> +
> + hot_range_item_init(hr, start, he);
> +
> + ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
> + if (ret) {
> + kmem_cache_free(hot_range_item_cachep, hr);
radix_tree_preload_end()
> + return ERR_PTR(ret);
> + }
> +
> + spin_lock(&he->lock);
> + ret = radix_tree_insert(&he->hot_range_tree, start, hr);
> + if (ret == -EEXIST) {
> + kmem_cache_free(hot_range_item_cachep, hr);
> + spin_unlock(&he->lock);
> + radix_tree_preload_end();
> + goto again;
> + }
> + spin_unlock(&he->lock);
> + radix_tree_preload_end();
> +
> + kref_get(&hr->hot_range.refs);
> + return hr;
> +}
david
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