On Friday 04 February 2011 08:49:31 HuangAlex wrote:
> Hi all,
>
> As mentioned in the note, yaffs treat everything as object. So i wonder how
> the directory structured in yaffs? Every directory have one chunk or many
> chunks? What is the chunkid and objectid for a directory?
>
> Thank you all.
>
> Alex

Alex

Please read  http://www.yaffs.net/files/yaffs.net/HowYaffsWorks.pdf

Directories are not stored in the flash. These are built up from the object 
headers on the fly and formed into lists of objects in the same directory.

Each object knows which object is its parent. This is stored in the object 
header

For example consider:

object id 500  file "a", parent is object id 503
object id 501  file "b", parent is object id 503
object id 502 directory "d", parent is 1 (1 is the root)
object id 503  directory "dir" parent is 502

that gives us the following paths
object id    1"/"
object id 500 "/d/dir/a"
object id 501 "/d/dir/b"
object id 502 "/d"
object id 503 "/d/dir"