btrfs-progs: Add last_cache_extent() for extent-cache.

Allow direct search for the last cache extent.
Provide the basis for finding the last ino in inode_cache.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/extent-cache.h b/extent-cache.h
index cba83d15..a9d07e18 100644
--- a/extent-cache.h
+++ b/extent-cache.h
@@ -41,6 +41,7 @@ struct cache_extent {
 void cache_tree_init(struct cache_tree *tree);
 
 struct cache_extent *first_cache_extent(struct cache_tree *tree);
+struct cache_extent *last_cache_extent(struct cache_tree *tree);
 struct cache_extent *prev_cache_extent(struct cache_extent *pe);
 struct cache_extent *next_cache_extent(struct cache_extent *pe);