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Date:   Tue, 12 Sep 2017 08:46:12 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.cz>,
        linux-kernel@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>, linux-ext4@...r.kernel.org,
        linux-nvdimm@...ts.01.org
Subject: Re: [PATCH v2 4/5] ext4: add ext4_should_use_dax()

On Mon 11-09-17 23:05:25, Ross Zwisler wrote:
> This helper, in the spirit of ext4_should_dioread_nolock() et al., replaces
> the complex conditional in ext4_set_inode_flags().
> 
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>

Yeah, makes sense to me. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/inode.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 3207333..525dd63 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -4577,6 +4577,21 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
>  		!ext4_test_inode_state(inode, EXT4_STATE_XATTR));
>  }
>  
> +static bool ext4_should_use_dax(struct inode *inode)
> +{
> +	if (!test_opt(inode->i_sb, DAX))
> +		return false;
> +	if (!S_ISREG(inode->i_mode))
> +		return false;
> +	if (ext4_should_journal_data(inode))
> +		return false;
> +	if (ext4_has_inline_data(inode))
> +		return false;
> +	if (ext4_encrypted_inode(inode))
> +		return false;
> +	return true;
> +}
> +
>  void ext4_set_inode_flags(struct inode *inode)
>  {
>  	unsigned int flags = EXT4_I(inode)->i_flags;
> @@ -4592,9 +4607,7 @@ void ext4_set_inode_flags(struct inode *inode)
>  		new_fl |= S_NOATIME;
>  	if (flags & EXT4_DIRSYNC_FL)
>  		new_fl |= S_DIRSYNC;
> -	if (test_opt(inode->i_sb, DAX) && S_ISREG(inode->i_mode) &&
> -	    !ext4_should_journal_data(inode) && !ext4_has_inline_data(inode) &&
> -	    !ext4_encrypted_inode(inode))
> +	if (ext4_should_use_dax(inode))
>  		new_fl |= S_DAX;
>  	inode_set_flags(inode, new_fl,
>  			S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX);
> -- 
> 2.9.5
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR

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