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>
diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c
index 937c272..ea0ce41 100644
--- a/fs/ocfs2/extent_map.c
+++ b/fs/ocfs2/extent_map.c
@@ -50,13 +50,15 @@
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 @@
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 @@
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 @@
*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:
