1 files changed, 60 insertions, 0 deletions

diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c
index aed268e80b49..a7b1cfa735bf 100644
--- a/fs/ocfs2/extent_map.c
+++ b/fs/ocfs2/extent_map.c
@@ -551,6 +551,66 @@ static void ocfs2_relative_extent_offsets(struct super_block *sb,
                 *num_clusters = le16_to_cpu(rec->e_leaf_clusters) - coff;
 }
 
+int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
+                             u32 *p_cluster, u32 *num_clusters,
+                             struct ocfs2_extent_list *el)
+{
+        int ret = 0, i;
+        struct buffer_head *eb_bh = NULL;
+        struct ocfs2_extent_block *eb;
+        struct ocfs2_extent_rec *rec;
+        u32 coff;
+
+        if (el->l_tree_depth) {
+                ret = ocfs2_find_leaf(inode, el, v_cluster, &eb_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                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 "
+                                    "xattr 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);
+        if (i == -1) {
+                ret = -EROFS;
+                mlog_errno(ret);
+                goto out;
+        } else {
+                rec = &el->l_recs[i];
+                BUG_ON(v_cluster < le32_to_cpu(rec->e_cpos));
+
+                if (!rec->e_blkno) {
+                        ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
+                                    "record (%u, %u, 0) in xattr", inode->i_ino,
+                                    le32_to_cpu(rec->e_cpos),
+                                    ocfs2_rec_clusters(el, rec));
+                        ret = -EROFS;
+                        goto out;
+                }
+                coff = v_cluster - le32_to_cpu(rec->e_cpos);
+                *p_cluster = ocfs2_blocks_to_clusters(inode->i_sb,
+                                                    le64_to_cpu(rec->e_blkno));
+                *p_cluster = *p_cluster + coff;
+                if (num_clusters)
+                        *num_clusters = ocfs2_rec_clusters(el, rec) - coff;
+        }
+out:
+        if (eb_bh)
+                brelse(eb_bh);
+        return ret;
+}
+
 int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
                        u32 *p_cluster, u32 *num_clusters,
                        unsigned int *extent_flags)