Re: crazy swapping
Brian Gerst (bgerst@quark.vpplus.com)
Sun, 29 Nov 1998 12:38:26 -0500
Mark Gray wrote:
>
> Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> writes:
>
> >
> > When you create a file that have holes (using
> > creat();lseek(10000000);write("xxx");close()), and make it swap file,
> > system crashes and you get "rw_swap_page: bad swap file" message. Tested
> > on 2.0.33 and 2.1.129.
> >
> > Mikulas Patocka
>
> >From man mkswap:
> [snip]
> To setup a swap file, it is necessary to create that file
> before running mkswap . A sequence of commands similar to
> the following is reasonable for this purpose:
>
> # dd if=/dev/zero of=swapfile bs=1024 count=8192
> # mkswap swapfile 8192
> # sync
> # swapon swapfile
>
> Note that a swap file must not contain any holes (so,
> using cp(1) to create the file is not acceptable).
Would it be possible to make swapon refuse to enable swap on files with
holes in them?
--
Brian Gerst
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