In message <[EMAIL PROTECTED]>, Luoqi Chen write
>> Background:

>> Ideally struct buf should have had a real OO like operations vector
>> like vnodes have it, and struct bioops is the first step towards that.
>struct buf will eventually become merely an iocmd structure, so why do
>we want to complicate things here?

No, struct buf will remain the cache-handle. the iocmd is called
struct bio.

>We already have an OO method for bwrite: VOP_BWRITE(), the problem
>is most of the code are still calling bwrite() directly. Will it
>solve your problem if we change every bwrite() into a VOP_BWRITE()?

Well, I'm not sure it is correct to go the detour around Vnodes,
if we do, we need to add VOP_BAWRITE, VOP_BDWRITE and all those
other operations as well.

But what vnode would you use for a buffer associated with a freeblock
bitmap ?

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
[EMAIL PROTECTED]         | TCP/IP since RFC 956
FreeBSD coreteam member | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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