linux-ext4 - Re: [PATCH 1/2] fscrypto: don't use on-stack buffer for filename encryption

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Message-ID: <20161107154444.GA13796@infradead.org>
Date:   Mon, 7 Nov 2016 07:44:44 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Kent Overstreet <kent.overstreet@...il.com>
Cc:     Eric Biggers <ebiggers@...gle.com>, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-crypto@...r.kernel.org, tytso@....edu, jaegeuk@...nel.org,
        richard@....at, luto@...nel.org
Subject: Re: [PATCH 1/2] fscrypto: don't use on-stack buffer for filename
 encryption

On Sat, Nov 05, 2016 at 07:13:49AM -0800, Kent Overstreet wrote:
> Vmalloc memory does have struct pages - you just need to use vmalloc_to_page()
> instead of virt_to_page. Look at drivers/md/bcache/util.c bch_bio_map() if you
> want an example.

That example seems to be clearly broken on virtually index caches
due to the lack of flush_kernel_vmap_range and
invalidate_kernel_vmap_range calls.
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