> On Jan 14, 2025, at 4:24 AM, tzsz <writing.segfau...@gmail.com> wrote:
>
> Hello everyone,
>
> I am currently wiring some code for university. In class we are working with
> Linux and are modifying the struct dentry. It is used for caching the
> relation between paths and inodes - after an resolution attempt that is. I
> was wondering how/if this is also implemented in NetBSD but I was not able to
> spot it in the source code.
>
> Could someone perhaps point me where to look?
It works a bit differently in NetBSD (and in BSD systems in general). In the
NetBSD kernel, you can find the code that manages the cache of parent+name ->
vnode mappings here:
https://github.com/NetBSD/src/blob/trunk/sys/kern/vfs_cache.c
In addition to being used to speed up path lookups, it can also be used to
reconstruct the (a) path for a vnode. Some examples of how that’s used:
https://github.com/NetBSD/src/blob/trunk/sys/kern/vfs_getcwd.c
In particular, vnode_to_path(), which is used in the exec code, but also the
__getcwd() system call.
-- thorpej
