linux-ext4 - Re: [RFC PATCH 8/8] f2fs: use memcpy_to_page() in pagecache

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Date:   Wed, 10 Feb 2021 10:01:35 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Chaitanya Kulkarni <chaitanya.kulkarni@....com>
Cc:     linux-block@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, axboe@...nel.dk, tytso@....edu,
        adilger.kernel@...ger.ca, jaegeuk@...nel.org, chao@...nel.org,
        johannes.thumshirn@....com, damien.lemoal@....com,
        bvanassche@....org, dongli.zhang@...cle.com, clm@...com,
        ira.weiny@...el.com, dsterba@...e.com, hch@...radead.org,
        dave.hansen@...el.com
Subject: Re: [RFC PATCH 8/8] f2fs: use memcpy_to_page() in pagecache_write()

On Sun, Feb 07, 2021 at 11:04:25AM -0800, Chaitanya Kulkarni wrote:
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>

No explanation in commit message?  There isn't much explanation needed for this,
but there should be at least one sentence.

Likewise for the other patches.

>  fs/f2fs/verity.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
> index 44e057bdc416..ca019685a944 100644
> --- a/fs/f2fs/verity.c
> +++ b/fs/f2fs/verity.c
> @@ -79,7 +79,6 @@ static int pagecache_write(struct inode *inode, const void *buf, size_t count,
>  				 PAGE_SIZE - offset_in_page(pos));
>  		struct page *page;
>  		void *fsdata;
> -		void *addr;
>  		int res;
>  
>  		res = pagecache_write_begin(NULL, inode->i_mapping, pos, n, 0,
> @@ -87,9 +86,7 @@ static int pagecache_write(struct inode *inode, const void *buf, size_t count,
>  		if (res)
>  			return res;
>  
> -		addr = kmap_atomic(page);
> -		memcpy(addr + offset_in_page(pos), buf, n);
> -		kunmap_atomic(addr);
> +		memcpy_to_page(page, offset_in_page(pos) buf, n);

This is missing a comma between 'offset_in_page(pos)' and 'buf'.

Otherwise the patches to fs/{ext4,f2fs}/verity.c look fine; thanks for doing
this!

- Eric