> +/** > + * fscrypt_dio_unsupported() - check whether a DIO (direct I/O) request is > + * unsupported due to encryption constraints > + * @iocb: the file and position the I/O is targeting > + * @iter: the I/O data segment(s) > + * > + * Return: true if DIO is unsupported > + */ > +bool fscrypt_dio_unsupported(struct kiocb *iocb, struct iov_iter *iter) I always find non-negated functions easier to follow, i.e. turn this into fscrypt_dio_supported(). > + /* > + * Since the granularity of encryption is filesystem blocks, the file > + * position and total I/O length must be aligned to the filesystem block > + * size -- not just to the block device's logical block size as is > + * traditionally the case for DIO on many filesystems (not including > + * f2fs, which only allows filesystem block aligned DIO anyway). I would not really mention a specific file system here.
