General dcache question

[usvyatsky, ilya]

Hi folks,
Sorry if this question does not really belong to this list, but it seems to
me that someone here can simply know the answer.
I am looking at Linux dcache mechanism trying to retreive a name (actually,
full path) of an active inode.
It seems that each active inode has a linked list of dentry's (i_dentry)
that holds a (partial) list of its names (links in fact),
and each dentry has d_name and d_parent.
Moshe Bar in his "Linux File Systems" book states that for every active
inode i_dentry would always contain at least one active
dentry. Moreover, such d_entry would have a valid d_parent field pointing at
active dcache entry containing a name of the parent directory. He also says
that only leaves with d_count equal to 0 are on the dcache LRU list.
Now, I wonder if the following assumption is true:
	For each active inode, there always be enough dcache entries (linked
through d_parent pointer) to restore the full path of the 	inode from
the root.
I also would appreciate it very much if someone familiar with 2.6 kernel
would confirm that this assumption still holds there.
Thanks a lot,
Ilya Usvyatsky.

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