linux-kernel - Re: [PATCH 01/26] fscrypto: Add buffer operations

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Message-ID: <20161021130558.GA2411@infradead.org>
Date:   Fri, 21 Oct 2016 06:05:58 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Richard Weinberger <richard@....at>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, dedekind1@...il.com,
        adrian.hunter@...el.com, tytso@....edu, jaegeuk@...nel.org,
        david@...ma-star.at, wd@...x.de, sbabic@...x.de,
        dengler@...utronix.de
Subject: Re: [PATCH 01/26] fscrypto: Add buffer operations

On Fri, Oct 21, 2016 at 02:48:16PM +0200, Richard Weinberger wrote:
> Not all filesystems operate on pages, therefore offer
> operations to en/decrypt buffers.
> Of course these buffers have to be allocated in a way such that
> the kernel crypto framework can work with them.

Which means they need to be backed by the page allocator eventually.
I think we'd better off providing the pages from ubifs from the API
point of view.  What are the issues with doing that?