1 files changed, 11 insertions, 7 deletions

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 74db2be75dd6..fb6aa7acf54b 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -626,7 +626,7 @@ static int ocfs2_create_refcount_tree(struct inode *inode,
         rb = (struct ocfs2_refcount_block *)new_bh->b_data;
         memset(rb, 0, inode->i_sb->s_blocksize);
         strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
-        rb->rf_suballoc_slot = cpu_to_le16(osb->slot_num);
+        rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
         rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
         rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
         rb->rf_blkno = cpu_to_le64(first_blkno);
@@ -1330,7 +1330,7 @@ static int ocfs2_expand_inline_ref_root(handle_t *handle,
         memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
 
         new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
-        new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num);
+        new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
         new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
         new_rb->rf_blkno = cpu_to_le64(blkno);
         new_rb->rf_cpos = cpu_to_le32(0);
@@ -1576,7 +1576,7 @@ static int ocfs2_new_leaf_refcount_block(handle_t *handle,
         new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
         memset(new_rb, 0, sb->s_blocksize);
         strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
-        new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num);
+        new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
         new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
         new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
         new_rb->rf_blkno = cpu_to_le64(blkno);
@@ -2945,7 +2945,7 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
 
         while (offset < end) {
                 page_index = offset >> PAGE_CACHE_SHIFT;
-                map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
+                map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
                 if (map_end > end)
                         map_end = end;
 
@@ -2957,8 +2957,12 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
 
                 page = grab_cache_page(mapping, page_index);
 
-                /* This page can't be dirtied before we CoW it out. */
-                BUG_ON(PageDirty(page));
+                /*
+                 * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page
+                 * can't be dirtied before we CoW it out.
+                 */
+                if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
+                        BUG_ON(PageDirty(page));
 
                 if (!PageUptodate(page)) {
                         ret = block_read_full_page(page, ocfs2_get_block);
@@ -3170,7 +3174,7 @@ static int ocfs2_cow_sync_writeback(struct super_block *sb,
 
         while (offset < end) {
                 page_index = offset >> PAGE_CACHE_SHIFT;
-                map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
+                map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
                 if (map_end > end)
                         map_end = end;