Re: [PATCH 1/5] btrfs: unify the ro checking for mount options

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2020/9/24 下午11:32, Josef Bacik wrote:
> We're going to be adding more options that require RDONLY, so add a
> helper to do the check and error out if we don't have RDONLY set.
> 
> Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>

Thanks,
Qu
> ---
>  fs/btrfs/super.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> index 8840a4fa81eb..f99e89ec46b2 100644
> --- a/fs/btrfs/super.c
> +++ b/fs/btrfs/super.c
> @@ -458,6 +458,17 @@ static const match_table_t rescue_tokens = {
>  	{Opt_err, NULL},
>  };
>  
> +static bool check_ro_option(struct btrfs_fs_info *fs_info, unsigned long opt,
> +			    const char *opt_name)
> +{
> +	if (fs_info->mount_opt & opt) {
> +		btrfs_err(fs_info, "%s must be used with ro mount option",
> +			  opt_name);
> +		return true;
> +	}
> +	return false;
> +}
> +
>  static int parse_rescue_options(struct btrfs_fs_info *info, const char *options)
>  {
>  	char *opts;
> @@ -968,14 +979,12 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
>  		}
>  	}
>  check:
> -	/*
> -	 * Extra check for current option against current flag
> -	 */
> -	if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & SB_RDONLY)) {
> -		btrfs_err(info,
> -			  "nologreplay must be used with ro mount option");
> +	/* We're read-only, don't have to check. */
> +	if (new_flags & SB_RDONLY)
> +		goto out;
> +
> +	if (check_ro_option(info, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay"))
>  		ret = -EINVAL;
> -	}
>  out:
>  	if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) &&
>  	    !btrfs_test_opt(info, FREE_SPACE_TREE) &&
> 


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