diff options
Diffstat (limited to 'fs/ocfs2/alloc.h')
| -rw-r--r-- | fs/ocfs2/alloc.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h index 3cb39cd5e478..fbcb5934a081 100644 --- a/fs/ocfs2/alloc.h +++ b/fs/ocfs2/alloc.h @@ -85,4 +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 */ |