linux-ext4 - Re: [PATCH] iomap: Add inline data support to iomap_readpage

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Message-ID: <20180702125230.GB3366@lst.de>
Date:   Mon, 2 Jul 2018 14:52:30 +0200
From:   Christoph Hellwig <hch@....de>
To:     Andreas Gruenbacher <agruenba@...hat.com>
Cc:     Christoph Hellwig <hch@....de>,
        cluster-devel <cluster-devel@...hat.com>,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] iomap: Add inline data support to iomap_readpage_actor

On Sun, Jul 01, 2018 at 11:43:43PM +0200, Andreas Gruenbacher wrote:
> > +               WARN_ON_ONCE(plen != PAGE_SIZE);
> 
> Inline mappings only extend to the end of the file (iomap->offset == 0
> && iomap->length == inode->i_size), so length and plen will be
> inode->i_size here. This assertion should just be removed.

But we should generally still return PAGE_SIZE from iomap_begin
because we cover the whole page and zero the rest, don't we?

Either way, I can remove the assert from now.