Re: [PATCH][RFC] truncate vs add_to_page_cache race

[Nick Piggin]

Andrew Morton wrote:
> Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:

> > OK, I made a debug patch to printk and schedule_timeout in this
> > race window so I can easily truncate the file. When this happens,
> > it turns out that the readpage thinks it is reading a hole and
> > fills the page with zeros -> invalid result?
>
>
> A zero-filled pagecache page outside i_size is OK.

Yes. But in this case the zero filled page actually gets
read by read(2).

In any case, I think my patch won't close the race completely.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/