linux-ext4 - Re: [PATCH 1/3] ext4: require key for truncate(2) of encrypted file

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Message-ID: <20170614070614.GA1786@infradead.org>
Date:   Wed, 14 Jun 2017 00:06:14 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        linux-fscrypt@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org, Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH 1/3] ext4: require key for truncate(2) of encrypted file

On Wed, Jun 14, 2017 at 12:03:57AM -0700, Eric Biggers wrote:
> None of those are allowed because fallocate() requires a file descriptor, and
> open() fails with ENOKEY if the encryption key is not available.  truncate() is
> different because it takes a path, not a file descriptor.

Ok, that makes sense.