ocfs2: make room for unwritten extents flag

Due to the size of our group bitmaps, we'll never have a leaf node extent
record with more than 16 bits worth of clusters. Split e_clusters up so that
leaf nodes can get a flags field where we can mark unwritten extents.
Interior nodes whose length references all the child nodes beneath it can't
split their e_clusters field, so we use a union to preserve sizing there.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c
index 937c2722b753..ea0ce41d4193 100644
--- a/fs/ocfs2/extent_map.c
+++ b/fs/ocfs2/extent_map.c
@@ -50,13 +50,15 @@ static int ocfs2_search_extent_list(struct ocfs2_extent_list *el,
         int ret = -1;
         int i;
         struct ocfs2_extent_rec *rec;
-        u32 rec_end, rec_start;
+        u32 rec_end, rec_start, clusters;
 
         for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
                 rec = &el->l_recs[i];
 
                 rec_start = le32_to_cpu(rec->e_cpos);
-                rec_end = rec_start + le32_to_cpu(rec->e_clusters);
+                clusters = ocfs2_rec_clusters(el, rec);
+
+                rec_end = rec_start + clusters;
 
                 if (v_cluster >= rec_start && v_cluster < rec_end) {
                         ret = i;
@@ -98,6 +100,15 @@ int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
 
                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
                 el = &eb->h_list;
+
+                if (el->l_tree_depth) {
+                        ocfs2_error(inode->i_sb,
+                                    "Inode %lu has non zero tree depth in "
+                                    "leaf block %llu\n", inode->i_ino,
+                                    (unsigned long long)eb_bh->b_blocknr);
+                        ret = -EROFS;
+                        goto out;
+                }
         }
 
         i = ocfs2_search_extent_list(el, v_cluster);
@@ -118,7 +129,7 @@ int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
                         ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
                                     "record (%u, %u, 0)", inode->i_ino,
                                     le32_to_cpu(rec->e_cpos),
-                                    le32_to_cpu(rec->e_clusters));
+                                    ocfs2_rec_clusters(el, rec));
                         ret = -EROFS;
                         goto out;
                 }
@@ -130,7 +141,7 @@ int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
                 *p_cluster = *p_cluster + coff;
 
                 if (num_clusters)
-                        *num_clusters = le32_to_cpu(rec->e_clusters) - coff;
+                        *num_clusters = ocfs2_rec_clusters(el, rec) - coff;
         }
 
 out: