On Wed, 24 Mar 2010 21:32:39 +0800, jing zhang <zj.barak@xxxxxxxxx> wrote:
> From: Jing Zhang <zj.barak@xxxxxxxxx>
>
> Date: Wed Mar 24 21:30:22 2010
>
> There may exist fast path for merge if merge-able.
>
> Cc: Theodore Ts'o <tytso@xxxxxxx>
> Cc: Andreas Dilger <adilger@xxxxxxx>
> Cc: Dave Kleikamp <shaggy@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Jing Zhang <zj.barak@xxxxxxxxx>
>
> ---
>
> --- linux-2.6.32/fs/ext4/mballoc.c 2009-12-03 11:51:22.000000000 +0800
> +++ ext4_mm_leak/mballoc7.c 2010-03-24 21:27:24.000000000 +0800
> @@ -4385,6 +4385,24 @@ ext4_mb_free_metadata(handle_t *handle,
> }
> }
>
> + if (parent) {
> + /* let's try fast path */
> + entry = rb_entry(parent, struct ext4_free_data, node);
> + if (n == &parent->rb_left) {
> + if (can_merge(new_entry, entry)) {
> + entry->start_blk = new_entry->start_blk;
> + entry->count += new_entry->count;
> + /* and info the caller that new_entry is
> + * not used yet.
> + */
> + return 0;
return 0 on success so you may want -1 here
> + }
> + }
> + else if (can_merge(entry, new_entry)) {
> + entry->count += new_entry->count;
> + return 0;
> + }
> + }
> rb_link_node(new_node, parent, n);
> rb_insert_color(new_node, &db->bb_free_root);
> --
-aneesh
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