Re: 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.)

[Steven Cole]

On Monday 17 May 2004 01:46 am, Andrew Morton wrote:
> Andrew Morton <akpm@xxxxxxxx> wrote:
> >
> >  If an application does mmap(MAP_SHARED) of, say, a 2048 byte file and then
> >  extends it:
> > 
> >  	p = mmap(..., fd, ...);
> >  	ftructate(fd, 4096);
> >  	p[3000] = 1;
> > 
> >  A racing block_write_full_page() could fail to notice the extended i_size
> >  and would decide to zap those 2048 bytes anyway.
> 
> This should plug it.

I'll test this tonight when I get back to this home machine.

Thanks, and thanks to Bitmover for providing the resources to help chase this bug.

Steven
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