make_ext4fs: fix dentry padding when dentry size is 4088 or 4092
When the total dentry size is N * 4096 - 4 or N * 4096 - 8, there is
not enough room in the block to insert an extra padding dentry.
Instead, switch to always padding the previous dentry out to the end
of the block, which matches what the kernel does when creating new
directory entries.
Also fix dentry_size to return the size of all the dentries
without the padding, the len + 8 padding is incorrect, and the
DIV_ROUND_UP will round up to the correct number of blocks.
Change-Id: If11f90e4ee172c135a0eae2a50b8be213e2dd0dc
diff --git a/ext4_utils/contents.c b/ext4_utils/contents.c
index 345ab1e..aeed31e 100644
--- a/ext4_utils/contents.c
+++ b/ext4_utils/contents.c
@@ -44,11 +44,6 @@
len += dentry_len;
}
- /* include size of the dentry used to pad until the end of the block */
- if (len % info.block_size + 8 > info.block_size)
- len += info.block_size - (len % info.block_size);
- len += 8;
-
return len;
}
@@ -160,11 +155,8 @@
}
}
- dentry = (struct ext4_dir_entry_2 *)(data + offset);
- dentry->inode = 0;
- dentry->rec_len = len - offset;
- dentry->name_len = 0;
- dentry->file_type = EXT4_FT_UNKNOWN;
+ /* pad the last dentry out to the end of the block */
+ dentry->rec_len += len - offset;
return inode_num;
}
