ocfs2: Add support of decrementing refcount for delete.

    Given a physical cpos and length, decrement the refcount
in the tree. If the refcount for any portion of the extent goes
to zero, that portion is queued for freeing.

Signed-off-by: Tao Ma <tao.ma@oracle.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/ocfs2/refcounttree.h b/fs/ocfs2/refcounttree.h
index 2ea7fc52c23c..ad4b483ec5c7 100644
--- a/fs/ocfs2/refcounttree.h
+++ b/fs/ocfs2/refcounttree.h
@@ -40,4 +40,9 @@ int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
                                 struct ocfs2_refcount_tree *tree,
                                 int rw);
+
+int ocfs2_decrease_refcount(struct inode *inode,
+                            handle_t *handle, u32 cpos, u32 len,
+                            struct ocfs2_alloc_context *meta_ac,
+                            struct ocfs2_cached_dealloc_ctxt *dealloc);
 #endif /* OCFS2_REFCOUNTTREE_H */