ocfs2: Add the 'inode64' mount option.

[karo-tx-linux.git] / fs / ocfs2 / extent_map.c

diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c
index aed268e80b49173a5a3af264bcd5ca5c7e55ca8a..a7b1cfa735bfd3ff76bfc39cdf4e8a189e3dac5e 100644 (file)
--- 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)