Re: [Jfs4bsd-devel] Removal of Metapages.. Completely!

[Sergey L. <de...@as...>]

On Mon, Jul 15, 2002 at 04:57:08PM -0400, Hiten Pandya wrote:
> Hello everyone.
> 
> I have finally come to think, that we are just wasting ample time trying
> to port Metapages; also, Sergey has disappeared, so I was wondering,
> that we should just remove Metapages completely.

Did you mean, remove the layer completely ?

I beleive vfs_bio.c does all the caching needed,
so I have planned to make a stubs in jfs_bufmgr.[ch] so that to preserve
the metapage interface (to ease the things), but make the use of
struct buf inside them.

the only difficulty i see in using bio interface directly is that
struct jbuf (struct metapage) holds some additional info (log stuff
etc), instead just on-disk data, and the code accesses it.
that is why I have considered keeping struct jbuf and metapage interface.
but probably that info may be moved to struct inode, freeing us from
buffering stuff at all.

dropping metapage interface sounds as a good idea, on the other side,
keeping it looks as a good choice as well (by the means of keeping
just the interface, redirecting all work to the vfs bio code).
I don't know, at this point, what is the best way :-)

-- 
Sergey Lyubka
Asita Technologies Int, Galway, Ireland