On 11/5/22 12:38 AM, David Howells wrote:
> Fix the dodgy maths in netfs_rreq_unlock_folios(). start_page could be
> inside the folio, in which case the calculation of pgpos will be come up
> with a negative number (though for the moment rreq->start is rounded down
> earlier and folios would have to get merged whilst locked)
>
> Alter how this works to just frame the tracking in terms of absolute file
> positions, rather than offsets from the start of the I/O request. This
> simplifies the maths and makes it easier to follow.
>
> Fix the issue by using folio_pos() and folio_size() to calculate the end
> position of the page.
>
> Fixes: 3d3c95046742 ("netfs: Provide readahead and readpage netfs helpers")
> Reported-by: Matthew Wilcox <wi...@infradead.org>
> Signed-off-by: David Howells <dhowe...@redhat.com>
> cc: Jeff Layton <jlay...@kernel.org>
> cc: linux-cachefs@redhat.com
> cc: linux-fsde...@vger.kernel.org
> Link: https://lore.kernel.org/r/y2sjw7w1isiik...@casper.infradead.org/
Reviewed-by: Jingbo Xu <jeffl...@linux.alibaba.com>
--
Thanks,
Jingbo
--
Linux-cachefs mailing list
Linux-cachefs@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-cachefs
