Re: [RFC] [PATCH 3/3] ufs: change b_blocknr

[Evgeniy Dushistov <dushistov@mail.ru>]

On Sun, May 14, 2006 at 03:58:01AM -0700, Andrew Morton wrote:
> Evgeniy Dushistov <dushistov@mail.ru> wrote:
> >
> > Because of ufs's layout, code which works with UFS should
> > time to time change such map "online":
> > physical location<-->logical inode block
> 
> It does?  You mean that certain parts of a file will get moved from one set
> of disk blocks to another?
> 
In short file: consist of several blocks and fragments.
sizeof(block)=8*sizeof(fragment),
fragments used to prevent unwanted waste of space.

When file is growing and we occupy 8 fragments in tail of it,
we should allocate whole block and move all 8 fragments to it.

In 2.2 I suppose such code works fine:
bh = sb_bread
bh->b_blocknr=newvalue
mark_buffer_dirty

I doubt that it is normal for 2.4,
and this was completely wrong for 2.6.

-- 
/Evgeniy

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