Re: [RFC 4/8] ext4: Add statx and other atomic write helper routines

[John Garry <john.g.garry@oracle.com>]

On 02/03/2024 07:42, Ritesh Harjani (IBM) wrote:
>   	}
>   
> +	if (request_mask & STATX_WRITE_ATOMIC) {
> +		unsigned int fsawu_min = 0, fsawu_max = 0;
> +
> +		/*
> +		 * Get fsawu_[min|max] value which we can advertise to userspace
> +		 * in statx call, if we support atomic writes using
> +		 * EXT4_MF_ATOMIC_WRITE_FSAWU.
> +		 */
> +		if (ext4_can_atomic_write_fsawu(inode->i_sb)) {

To me, it does not make sense to fill this in unless 
EXT4_INODE_ATOMIC_WRITE is also set for the inode.

> +			ext4_atomic_write_fsawu(inode->i_sb, &fsawu_min,
> +						&fsawu_max);
> +		}
> +
> +		generic_fill_statx_atomic_writes(stat, fsawu_min, fsawu_max);
> +	}
> +
>   	flags = ei->i_flags & EXT4_FL_USER_VISIBLE;