From mboxrd@z Thu Jan 1 00:00:00 1970 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 37632C4332F for ; Sat, 29 Jan 2022 00:27:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344738AbiA2A1r (ORCPT ); Fri, 28 Jan 2022 19:27:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344642AbiA2A1q (ORCPT ); Fri, 28 Jan 2022 19:27:46 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 56447C061714; Fri, 28 Jan 2022 16:27:46 -0800 (PST) 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 dfw.source.kernel.org (Postfix) with ESMTPS id F189061F6B; Sat, 29 Jan 2022 00:27:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 16B71C340E7; Sat, 29 Jan 2022 00:27:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643416065; bh=pMYiYWwTXCaMUttKGxLCbba/TS8VTa1Kq/qthmLQc8A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hTAM+kCV/tcMtH1taJy3HbXKHFdeNrapKvJ55E6k6BNArYcDR9hvzVgpghKlX+fo8 HSMYhybQBTB3flb/RRUQcCjU/wcnYCL3Jt1CTeg+J9diUVbSi1+k/E6nd9NK8ZSRHU QPAuxWZPSPNSrt2i47uKzMi7EydVnxmMd06oSEIaEqbxc5XzW539kHtLE5NeNWKwyg GF1Y/+nW/SESPfVZxVHkIqFDwtt1JIUzHbBjA7oeQIhiTtmv6Gt8OqmagKkT/tsq0r staxJFN6kFqa9jRH5RC5sjz723a4e4C3jEV0y6EyJ2XFxaPkcfzlFoVx9/KThoREV1 ybqbbx6by3l4A== Date: Fri, 28 Jan 2022 16:27:43 -0800 From: Jaegeuk Kim To: Eric Biggers Cc: linux-fscrypt@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, Theodore Ts'o , Christoph Hellwig , "Darrick J . Wong" , Dave Chinner , Satya Tangirala Subject: Re: [PATCH v11 4/5] f2fs: support direct I/O with fscrypt using blk-crypto Message-ID: References: <20220128233940.79464-1-ebiggers@kernel.org> <20220128233940.79464-5-ebiggers@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220128233940.79464-5-ebiggers@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On 01/28, Eric Biggers wrote: > 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. > > Therefore, make f2fs support DIO on files that are using inline > encryption. Since f2fs uses iomap for DIO, and fscrypt support was > already added to iomap DIO, this just requires two small changes: > > - Let DIO proceed when supported, by checking fscrypt_dio_supported() > instead of assuming that encrypted files never support DIO. > > - In f2fs_iomap_begin(), use fscrypt_limit_io_blocks() to limit the > length of the mapping in the rare case where a DUN discontiguity > occurs in the middle of an extent. The iomap DIO implementation > requires this, since it assumes that it can submit a bio covering (up > to) the whole mapping, without checking fscrypt constraints itself. > > Co-developed-by: Satya Tangirala > Signed-off-by: Satya Tangirala > Signed-off-by: Eric Biggers Acked-by: Jaegeuk Kim > --- > fs/f2fs/data.c | 7 +++++++ > fs/f2fs/f2fs.h | 6 +++++- > 2 files changed, 12 insertions(+), 1 deletion(-) > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > index 8c417864c66ae..020d47f97969c 100644 > --- a/fs/f2fs/data.c > +++ b/fs/f2fs/data.c > @@ -4044,6 +4044,13 @@ static int f2fs_iomap_begin(struct inode *inode, loff_t offset, loff_t length, > > iomap->offset = blks_to_bytes(inode, map.m_lblk); > > + /* > + * When inline encryption is enabled, sometimes I/O to an encrypted file > + * has to be broken up to guarantee DUN contiguity. Handle this by > + * limiting the length of the mapping returned. > + */ > + map.m_len = fscrypt_limit_io_blocks(inode, map.m_lblk, map.m_len); > + > if (map.m_flags & (F2FS_MAP_MAPPED | F2FS_MAP_UNWRITTEN)) { > iomap->length = blks_to_bytes(inode, map.m_len); > if (map.m_flags & F2FS_MAP_MAPPED) { > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index eb22fa91c2b26..db46f3cf0885d 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -4371,7 +4371,11 @@ static inline bool f2fs_force_buffered_io(struct inode *inode, > struct f2fs_sb_info *sbi = F2FS_I_SB(inode); > int rw = iov_iter_rw(iter); > > - if (f2fs_post_read_required(inode)) > + if (!fscrypt_dio_supported(iocb, iter)) > + return true; > + if (fsverity_active(inode)) > + return true; > + if (f2fs_compressed_file(inode)) > return true; > > /* disallow direct IO if any of devices has unaligned blksize */ > -- > 2.35.0