Re: [patch] pagecache-2.3.9-H3, bmap & ext2fs cleanup patch

Rogier Wolff (R.E.Wolff@BitWizard.nl)
Mon, 28 Jun 1999 08:57:05 +0200 (MEST)

Linus Torvalds wrote:
>
>
> On Sat, 26 Jun 1999, Ingo Molnar wrote:
> >
> > oh, i see. (i was used to setting this in the fs, this is why i missed it)
> > I think encoding holes in this way is bad, it will prevent legitimate uses
> > of the very same bit-combination: (!Mapped && Uptodate) will be useful if
> > we'll ever do 'delayed allocation' of filesystem blocks, it will represent
> > pretty ordinary blocks which are not yet mapped to the filesystem.
>
> Give me one valid reason to ever do that, please..

XFS?

A high-performance FS might want to postpone allocating file blocks
until it knows the filesize. Sure, it will have to start allocating
anyway if the file grows above a certain size, but by that time you
at least know it's not going to stay a small file.

Roger.

-- 
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
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