linux-ext4 - Re: [PATCH 0/1] iomap: Direct I/O for inline data

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Date:   Fri, 29 Jun 2018 10:43:13 +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 0/1] iomap: Direct I/O for inline data

> A possible fix is to change the alignment check in iomap_dio_actor as follows:
> 
> -       if ((pos | length | align) & ((1 << blkbits) - 1))
> +       if ((pos | align) & ((1 << blkbits) - 1))
> +               return -EINVAL;
> +       if (length & ((1 << blkbits) - 1) &&
> +           pos + length != iomap->offset + iomap->length)
>                 return -EINVAL;
> 
> Moving the alignment check from iomap_dio_actor to iomap_dio_rw isn't
> that easy because iomap->bdev isn't known there.

Just make the check conditional on iomap->type != IOMAP_INLINE
as alignment checks on inline data don't make much sense.