Re: [PATCH v5 07/11] iomap: fix iomap_dio_zero() for fs bs > system page size

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On Wed, May 08, 2024 at 05:24:53AM +0100, Matthew Wilcox wrote:
> On Tue, May 07, 2024 at 09:13:17AM -0700, Christoph Hellwig wrote:
> > On Tue, May 07, 2024 at 05:11:58PM +0100, Matthew Wilcox wrote:
> > > > 	__bio_add_page(bio, page, len, 0);
> > > 
> > > no?  len can be > PAGE_SIZE.
> > 
> > Yes. So what?
> 
> the zero_page is only PAGE_SIZE bytes long.  so you'd be writing
> from the page that's after the zero page, whatever contents that has.

This is the exact reason this patch was added. We were writing the
garbage value past the PAGE_SIZE for LBS that led to FS corruption. Not
an issue where FS block size <= page size.

-- 
Pankaj Raghav




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