[PATCH 13/25] mtd: Convert to dynamically allocated bdi infrastructure

[Christoph Hellwig]

> +	sb->s_bdi = bdi_get(mtd_bdi);
> +	sb->s_iflags |= SB_I_DYNBDI;

FTI, while I think this is a faithful conversion of the existing code,
the single bdi for all MTD devices looks rather bogus to me..

Otherwise this looks good:

Reviewed-by: Christoph Hellwig <hch at lst.de>