X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Focfs2%2Falloc.h;h=fbcb5934a0817e72ecc7bca583a3ae00b1ef1dae;hb=345a1e150ed722bded478e23d3d75b6b73c63d5c;hp=bff2a162b0306e9012af25ea14217fb1e6ad8433;hpb=363041a5f74b953ab6b705ac9c88e5eda218a24b;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index bff2a16..fbcb593 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -71,6 +71,8 @@ struct ocfs2_truncate_context {
 	struct buffer_head *tc_last_eb_bh;
 };
 
+int ocfs2_zero_tail_for_truncate(struct inode *inode, handle_t *handle,
+				 u64 new_i_size);
 int ocfs2_prepare_truncate(struct ocfs2_super *osb,
 			   struct inode *inode,
 			   struct buffer_head *fe_bh,
@@ -83,4 +85,23 @@ int ocfs2_commit_truncate(struct ocfs2_super *osb,
 int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
 		    u32 cpos, struct buffer_head **leaf_bh);
 
+/*
+ * Helper function to look at the # of clusters in an extent record.
+ */
+static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el,
+					      struct ocfs2_extent_rec *rec)
+{
+	/*
+	 * Cluster count in extent records is slightly different
+	 * between interior nodes and leaf nodes. This is to support
+	 * unwritten extents which need a flags field in leaf node
+	 * records, thus shrinking the available space for a clusters
+	 * field.
+	 */
+	if (el->l_tree_depth)
+		return le32_to_cpu(rec->e_int_clusters);
+	else
+		return le16_to_cpu(rec->e_leaf_clusters);
+}
+
 #endif /* OCFS2_ALLOC_H */