From patchwork Thu Jan 20 07:12:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 12718331 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8307BC43217 for ; Thu, 20 Jan 2022 07:16:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358974AbiATHQV (ORCPT ); Thu, 20 Jan 2022 02:16:21 -0500 Received: from sin.source.kernel.org ([145.40.73.55]:41220 "EHLO sin.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358940AbiATHQS (ORCPT ); Thu, 20 Jan 2022 02:16:18 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id C6C53CE1BF4; Thu, 20 Jan 2022 07:16:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9082C340EA; Thu, 20 Jan 2022 07:16:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642662975; bh=XFRJyq9JwA9XPF4vR5ySTRSqsenmdAT9W838NjzwtMg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FgNVR2Z3+6Ee+qaX0ZbXbjAKDC07UhzIqb3SGXNLadLSv5hhejusWthRe4qnTC3k5 Z/W7M97ZR/sdHMLYagSBimRYJ21iEwxtLQsjhE7h3SgTZb8vvoOLraHWyf9fu9c7CK NeuXH/yUGskmKxdRSxjXF2IH4MlfWQbv51/fh8HodUP0Q0Dy7kHc6FFgAA0oXWWej6 mKhBol/dHRJzXePgQEAAI7MTAr3l2WzGuBykz4FjODp/dssy8J4psT0Asl7w9iIy8k tfORdcwRHeGQTQNN9cFhqAg9+NEACVxUYFfk7rqAJ1dKMV8XiGbHXrXjdu5EYeliLo JR613w5Npkc/A== From: Eric Biggers To: linux-fscrypt@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, Christoph Hellwig , Dave Chinner , "Darrick J . Wong" , Theodore Ts'o , Jaegeuk Kim , Chao Yu , Satya Tangirala Subject: [PATCH v10 2/5] iomap: support direct I/O with fscrypt using blk-crypto Date: Wed, 19 Jan 2022 23:12:12 -0800 Message-Id: <20220120071215.123274-3-ebiggers@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220120071215.123274-1-ebiggers@kernel.org> References: <20220120071215.123274-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org From: Eric Biggers Encrypted files traditionally haven't supported DIO, due to the need to encrypt/decrypt the data. However, when the encryption is implemented using inline encryption (blk-crypto) instead of the traditional filesystem-layer encryption, it is straightforward to support DIO. Add support for this to the iomap DIO implementation by calling fscrypt_set_bio_crypt_ctx() to set encryption contexts on the bios. Don't check for the rare case where a DUN (crypto data unit number) discontiguity creates a boundary that bios must not cross. Instead, filesystems are expected to handle this in ->iomap_begin() by limiting the length of the mapping so that iomap doesn't have to worry about it. Co-developed-by: Satya Tangirala Signed-off-by: Satya Tangirala Acked-by: Darrick J. Wong Signed-off-by: Eric Biggers Reviewed-by: Christoph Hellwig --- fs/iomap/direct-io.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 03ea367df19a4..20325b3926fa3 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -179,11 +180,14 @@ static void iomap_dio_bio_end_io(struct bio *bio) static void iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio, loff_t pos, unsigned len) { + struct inode *inode = file_inode(dio->iocb->ki_filp); struct page *page = ZERO_PAGE(0); int flags = REQ_SYNC | REQ_IDLE; struct bio *bio; bio = bio_alloc(GFP_KERNEL, 1); + fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits, + GFP_KERNEL); bio_set_dev(bio, iter->iomap.bdev); bio->bi_iter.bi_sector = iomap_sector(&iter->iomap, pos); bio->bi_private = dio; @@ -310,6 +314,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, } bio = bio_alloc(GFP_KERNEL, nr_pages); + fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits, + GFP_KERNEL); bio_set_dev(bio, iomap->bdev); bio->bi_iter.bi_sector = iomap_sector(iomap, pos); bio->bi_write_hint = dio->iocb->ki_hint;