Re: Patch (repost): cramfs memory corruption fix

[Christoph Hellwig <hch@caldera.de>]

In article <qwwwvc6tbau.fsf@sap.com> you wrote:
> Hi Linus,
>
> On Sun, 7 Jan 2001, Linus Torvalds wrote:
>> I wonder what to do about this - the limits are obviously useful, as
>> would the "use swap-space as a backing store" thing be. At the same
>> time I'd really hate to lose the lean-mean-clean ramfs.
>
> Let me repeat on this issue: shmem.c has everything needed for this
> despite read and write and they should be really easy to add. 
>
> I did not plan to write them in the near future because I did not
> think that this is a really wanted feature. But I can look into it.
>

I had a prototype tmpfs in -test10 (ro so) times.  It based on ramfs
for all the metadata stuff and used the (old) shmfs code for swap-backed
data.  The only real problem the code had, was that it needed a ->allocpage
address_space method in place of page_cache_alloc() to directly swap-in
pages in ->read.  IF anyone is interested I could forward port it to 2.4.0
and the new shmfs.

	Christoph

-- 
Whip me.  Beat me.  Make me maintain AIX.
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