linux-ext4 - Re: [PATCH v3 5/6] ocfs2: convert to use i

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Date:   Fri, 10 Mar 2023 03:26:11 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Yangtao Li <frank.li@...o.com>
Cc:     xiang@...nel.org, chao@...nel.org, huyue2@...lpad.com,
        jefflexu@...ux.alibaba.com, tytso@....edu,
        adilger.kernel@...ger.ca, rpeterso@...hat.com, agruenba@...hat.com,
        mark@...heh.com, jlbec@...lplan.org, joseph.qi@...ux.alibaba.com,
        brauner@...nel.org, linux-erofs@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
        cluster-devel@...hat.com, ocfs2-devel@....oracle.com,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 5/6] ocfs2: convert to use i_blockmask()

On Thu, Mar 09, 2023 at 11:21:26PM +0800, Yangtao Li wrote:
> Use i_blockmask() to simplify code. BTW convert ocfs2_is_io_unaligned
> to return bool type.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
> v3:
> -none
>  fs/ocfs2/file.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
> index efb09de4343d..baefab3b12c9 100644
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -2159,14 +2159,14 @@ int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
>  	return ret;
>  }
>  
> -static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
> +static bool ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
>  {
> -	int blockmask = inode->i_sb->s_blocksize - 1;
> +	int blockmask = i_blockmask(inode);
>  	loff_t final_size = pos + count;
>  
>  	if ((pos & blockmask) || (final_size & blockmask))
> -		return 1;
> -	return 0;
> +		return true;
> +	return false;
>  }

Ugh...
	return (pos | count) & blockmask;
surely?  Conversion to bool will take care of the rest.  Or you could make
that
	return ((pos | count) & blockmask) != 0;

And the fact that the value will be the same (i.e. that ->i_blkbits is never
changed by ocfs2) is worth mentioning in commit message...