Subject: 32 bit dev_t: I need a namei guru.
To: None <tech-kern@NetBSD.ORG>
From: Todd Vierling <tv@NetBSD.ORG>
Date: 01/12/1998 19:56:18
I have a stumbling block I can't figure out in the transition from 16 to 32
but dev_t. I can't 'mount -u /' running the new kernel.
I tracked it down. sys_mount() doesn't care about the dev_t's, and it ends
up calling ffs_mount(), who in turn calls namei() and checks the
*vnode*pointer* of the boot-time root device to the *vnode*pointer* of the
special device as returned by namei. Somehow, these pointers match when
using the old style 16 bit dev_t's.
Okay, if dev_t's match, checkalias() woukd catch that and replace the vnode
pointer with the "same" pointer so they would be equal. But namei() doesn't
call checkalias(), or cares at all about the dev_t... or does it? I'm
getting lost in a maze of twisty code.... (Point of fact: I did fix the
SPECHASH() macro so that it returns the same has value regardless of 16 or
32 bit dev_t.)
===== Todd Vierling (Personal email@example.com) =====
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