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From: Eric Biggers <ebiggers@kernel.org>
To: Satya Tangirala <satyat@google.com>
Cc: "Theodore Y . Ts'o" <tytso@mit.edu>,
	Jaegeuk Kim <jaegeuk@kernel.org>, Chao Yu <chao@kernel.org>,
	Jens Axboe <axboe@kernel.dk>,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	linux-kernel@vger.kernel.org, linux-fscrypt@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-xfs@vger.kernel.org, linux-block@vger.kernel.org,
	linux-ext4@vger.kernel.org
Subject: Re: [PATCH v9 3/9] fscrypt: add functions for direct I/O support
Date: Fri, 23 Jul 2021 13:42:54 -0700	[thread overview]
Message-ID: <YPspzik6k71BD/EJ@gmail.com> (raw)
In-Reply-To: <20210604210908.2105870-4-satyat@google.com>

On Fri, Jun 04, 2021 at 09:09:02PM +0000, Satya Tangirala wrote:
> +bool fscrypt_dio_supported(struct kiocb *iocb, struct iov_iter *iter)
> +{
> +	const struct inode *inode = file_inode(iocb->ki_filp);
> +	const unsigned int blocksize = i_blocksize(inode);
> +
> +	/* If the file is unencrypted, no veto from us. */
> +	if (!fscrypt_needs_contents_encryption(inode))
> +		return true;
> +
> +	/* We only support direct I/O with inline crypto, not fs-layer crypto */
> +	if (!fscrypt_inode_uses_inline_crypto(inode))
> +		return false;
> +
> +	/*
> +	 * Since the granularity of encryption is filesystem blocks, the I/O
> +	 * must be block aligned -- not just disk sector aligned.
> +	 */
> +	if (!IS_ALIGNED(iocb->ki_pos | iov_iter_count(iter), blocksize))
> +		return false;

The above comment should make it clear that "block aligned" here intentionally
applies to just the position and total length, not to the individual data
buffers, for which only disk sector alignment is required.

- Eric

  reply	other threads:[~2021-07-23 20:43 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04 21:08 [PATCH v9 0/9] add support for direct I/O with fscrypt using blk-crypto Satya Tangirala
2021-06-04 21:09 ` [PATCH v9 1/9] block: blk-crypto-fallback: handle data unit split across multiple bvecs Satya Tangirala
2021-06-04 21:09 ` [PATCH v9 2/9] block: blk-crypto: relax alignment requirements for bvecs in bios Satya Tangirala
2021-06-04 21:09 ` [PATCH v9 3/9] fscrypt: add functions for direct I/O support Satya Tangirala
2021-07-23 20:42   ` Eric Biggers [this message]
2021-06-04 21:09 ` [PATCH v9 4/9] direct-io: add support for fscrypt using blk-crypto Satya Tangirala
2021-06-04 21:09 ` [PATCH v9 5/9] block: Make bio_iov_iter_get_pages() respect bio_required_sector_alignment() Satya Tangirala
2021-06-04 22:51   ` kernel test robot
2021-06-05  2:55   ` kernel test robot
2021-07-23 21:33   ` Eric Biggers
2021-07-24  7:19     ` Christoph Hellwig
2021-06-04 21:09 ` [PATCH v9 6/9] iomap: support direct I/O with fscrypt using blk-crypto Satya Tangirala
2021-07-22 19:04   ` Darrick J. Wong
2021-06-04 21:09 ` [PATCH v9 7/9] ext4: " Satya Tangirala
2021-06-04 21:09 ` [PATCH v9 8/9] f2fs: " Satya Tangirala
2021-06-04 21:09 ` [PATCH v9 9/9] fscrypt: update documentation for direct I/O support Satya Tangirala
     [not found] ` <CAF2Aj3h-Gt3bOxH4wXB7aeQ3jVzR3TEqd3uLsh4T9Q=e6W6iqQ@mail.gmail.com>
2021-07-22 14:48   ` [PATCH v9 0/9] add support for direct I/O with fscrypt using blk-crypto Eric Biggers
2021-08-04  8:26     ` Lee Jones

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