RE: [PATCH v2 02/10] fs/ntfs3: Add initialization of super block

[Konstantin Komarov <almaz.alexandrovich@paragon-software.com>]

From: Pali Rohár <pali@kernel.org>
Sent: Sunday, August 23, 2020 12:55 PM
> 
> On Friday 21 August 2020 16:25:03 Konstantin Komarov wrote:
> > +		case Opt_nls:
> > +			match_strlcpy(nls_name, &args[0], sizeof(nls_name));
> > +			break;
> > +
> > +		/* unknown option */
> > +		default:
> > +			if (!silent)
> > +				ntfs_error(
> > +					sb,
> > +					"Unrecognized mount option \"%s\" or missing value",
> > +					p);
> > +			//return -EINVAL;
> > +		}
> > +	}
> > +
> > +out:
> > +	if (nls_name[0]) {
> > +		sbi->nls = load_nls(nls_name);
> > +		if (!sbi->nls) {
> > +			/* critical ?*/
> > +			ntfs_error(sb, "failed to load \"%s\"\n", nls_name);
> > +			//return -EINVAL;
> 
> Well, I think it is a fatal error if user supplied NLS encoding cannot
> be loaded. If user via mount parameter specify that wants encoding XYZ
> and kernel loads different (e.g. default one) then userspace would be
> confused as it would expect encoding XYZ.
> 

Agreed. Will be fixed in V3.

> > +		}
> > +	}
> > +
> > +	if (!sbi->nls) {
> > +		sbi->nls = load_nls_default();
> > +		if (!sbi->nls) {
> > +			/* critical */
> > +			ntfs_error(sb, "failed to load default nls");
> > +			return -EINVAL;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}