linux-kernel - Re: [PATCH RFC 1/8] fs/ext4: Narrow scope of DAX check in setflags

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Date:   Wed, 15 Apr 2020 13:45:18 +0200
From:   Jan Kara <jack@...e.cz>
To:     ira.weiny@...el.com
Cc:     linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jeff Moyer <jmoyer@...hat.com>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH RFC 1/8] fs/ext4: Narrow scope of DAX check in setflags

On Mon 13-04-20 21:00:23, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> When preventing DAX and journaling on an inode.  Use the effective DAX
> check rather than the mount option.
> 
> This will be required to support per inode DAX flags.
> 
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>

Looks good to me. You can add:

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

								Honza

> ---
>  fs/ext4/ioctl.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index a0ec750018dd..ee3401a32e79 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -405,9 +405,9 @@ static int ext4_ioctl_setflags(struct inode *inode,
>  	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
>  		/*
>  		 * Changes to the journaling mode can cause unsafe changes to
> -		 * S_DAX if we are using the DAX mount option.
> +		 * S_DAX if the inode is DAX
>  		 */
> -		if (test_opt(inode->i_sb, DAX)) {
> +		if (IS_DAX(inode)) {
>  			err = -EBUSY;
>  			goto flags_out;
>  		}
> -- 
> 2.25.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR