linux-ext4 - Re: [PATCH 16/29] fsdax: simplify the offset check in dax_iomap

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Message-ID: <20211123224003.GK266024@magnolia>
Date:   Tue, 23 Nov 2021 14:40:03 -0800
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>, dm-devel@...hat.com,
        linux-xfs@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 16/29] fsdax: simplify the offset check in dax_iomap_zero

On Tue, Nov 09, 2021 at 09:32:56AM +0100, Christoph Hellwig wrote:
> The file relative offset must have the same alignment as the storage
> offset, so use that and get rid of the call to iomap_sector.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/dax.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/fs/dax.c b/fs/dax.c
> index 5364549d67a48..d7a923d152240 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -1123,7 +1123,6 @@ static vm_fault_t dax_pmd_load_hole(struct xa_state *xas, struct vm_fault *vmf,
>  
>  s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
>  {
> -	sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
>  	pgoff_t pgoff = dax_iomap_pgoff(iomap, pos);
>  	long rc, id;
>  	void *kaddr;
> @@ -1131,8 +1130,7 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
>  	unsigned offset = offset_in_page(pos);
>  	unsigned size = min_t(u64, PAGE_SIZE - offset, length);
>  
> -	if (IS_ALIGNED(sector << SECTOR_SHIFT, PAGE_SIZE) &&
> -	    (size == PAGE_SIZE))
> +	if (IS_ALIGNED(pos, PAGE_SIZE) && size == PAGE_SIZE)
>  		page_aligned = true;
>  
>  	id = dax_read_lock();
> -- 
> 2.30.2
>