From patchwork Mon Nov 7 14:42:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13034508 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 A8E27C43219 for ; Mon, 7 Nov 2022 14:42:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232073AbiKGOmp (ORCPT ); Mon, 7 Nov 2022 09:42:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56154 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231573AbiKGOmo (ORCPT ); Mon, 7 Nov 2022 09:42:44 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3235DBC37; Mon, 7 Nov 2022 06:42:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=n4pPHyOwaRdxHxGG9btccTsZ/aylnz4d4U/iIiA+4qU=; b=RhV5vkDxRo62MJF/b5xNUptTyM POeLn3P4J3PimNw+PwcS4Tuk82vMxrH4/0+gwLXbYBWYMNughMVunEh/ZLmpHZcI+6YjhRcWTYuFf dHboJTSai2ZpqTfSlG1p59U0HgIMXuQxpp7u4PqfQ+msgCKar2xQ7IG8psbziDq4kxf2ew3fjNoTD fKMABpy0Qqrc0R4oP8dcS8X45JzGAJUTENq3KVI9xSVDH1LQPGVG087W4k5IP3dN8izb+2OusV9vk exWXr2JIxZ/+/IdYE+wdjpqKHtnfjTtD6F0CXDS1+hzi2JcNITGD6p1B6osTdfMoznq0Ce+6jGTh9 fCmCMWXg==; Received: from [2001:4bb8:191:2450:bd6a:c86c:b287:8b99] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1os3Kc-00FJYi-K7; Mon, 07 Nov 2022 14:42:35 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Mike Snitzer , "Theodore Y. Ts'o" , Jaegeuk Kim , Eric Biggers , dm-devel@redhat.com, linux-block@vger.kernel.org, linux-fscrypt@vger.kernel.org Subject: [PATCH 1/3] blk-crypto: don't use struct request_queue for public interfaces Date: Mon, 7 Nov 2022 15:42:27 +0100 Message-Id: <20221107144229.1547370-2-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221107144229.1547370-1-hch@lst.de> References: <20221107144229.1547370-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org Switch all public blk-crypto interfaces to use struct block_device arguments to specify the device they operate on instead of th request_queue, which is a block layer implementation detail. Signed-off-by: Christoph Hellwig --- Documentation/block/inline-encryption.rst | 12 ++++++------ block/blk-crypto.c | 20 ++++++++++++-------- drivers/md/dm-table.c | 2 +- fs/crypto/inline_crypt.c | 8 +++----- include/linux/blk-crypto.h | 8 ++++---- 5 files changed, 26 insertions(+), 24 deletions(-) diff --git a/Documentation/block/inline-encryption.rst b/Documentation/block/inline-encryption.rst index 4d151fbe20583..f9bf18ea65093 100644 --- a/Documentation/block/inline-encryption.rst +++ b/Documentation/block/inline-encryption.rst @@ -142,7 +142,7 @@ Therefore, we also introduce *blk-crypto-fallback*, which is an implementation of inline encryption using the kernel crypto API. blk-crypto-fallback is built into the block layer, so it works on any block device without any special setup. Essentially, when a bio with an encryption context is submitted to a -request_queue that doesn't support that encryption context, the block layer will +block_device that doesn't support that encryption context, the block layer will handle en/decryption of the bio using blk-crypto-fallback. For encryption, the data cannot be encrypted in-place, as callers usually rely @@ -187,7 +187,7 @@ API presented to users of the block layer ``blk_crypto_config_supported()`` allows users to check ahead of time whether inline encryption with particular crypto settings will work on a particular -request_queue -- either via hardware or via blk-crypto-fallback. This function +block_device -- either via hardware or via blk-crypto-fallback. This function takes in a ``struct blk_crypto_config`` which is like blk_crypto_key, but omits the actual bytes of the key and instead just contains the algorithm, data unit size, etc. This function can be useful if blk-crypto-fallback is disabled. @@ -195,7 +195,7 @@ size, etc. This function can be useful if blk-crypto-fallback is disabled. ``blk_crypto_init_key()`` allows users to initialize a blk_crypto_key. Users must call ``blk_crypto_start_using_key()`` before actually starting to use -a blk_crypto_key on a request_queue (even if ``blk_crypto_config_supported()`` +a blk_crypto_key on a block_device (even if ``blk_crypto_config_supported()`` was called earlier). This is needed to initialize blk-crypto-fallback if it will be needed. This must not be called from the data path, as this may have to allocate resources, which may deadlock in that case. @@ -207,7 +207,7 @@ for en/decryption. Users don't need to worry about freeing the bio_crypt_ctx later, as that happens automatically when the bio is freed or reset. Finally, when done using inline encryption with a blk_crypto_key on a -request_queue, users must call ``blk_crypto_evict_key()``. This ensures that +block_device, users must call ``blk_crypto_evict_key()``. This ensures that the key is evicted from all keyslots it may be programmed into and unlinked from any kernel data structures it may be linked into. @@ -221,9 +221,9 @@ as follows: 5. ``blk_crypto_evict_key()`` (after all I/O has completed) 6. Zeroize the blk_crypto_key (this has no dedicated function) -If a blk_crypto_key is being used on multiple request_queues, then +If a blk_crypto_key is being used on multiple block_devices, then ``blk_crypto_config_supported()`` (if used), ``blk_crypto_start_using_key()``, -and ``blk_crypto_evict_key()`` must be called on each request_queue. +and ``blk_crypto_evict_key()`` must be called on each block_device. API presented to device drivers =============================== diff --git a/block/blk-crypto.c b/block/blk-crypto.c index a496aaef85ba4..0e0c2fc56c428 100644 --- a/block/blk-crypto.c +++ b/block/blk-crypto.c @@ -357,17 +357,18 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key, * request queue it's submitted to supports inline crypto, or the * blk-crypto-fallback is enabled and supports the cfg). */ -bool blk_crypto_config_supported(struct request_queue *q, +bool blk_crypto_config_supported(struct block_device *bdev, const struct blk_crypto_config *cfg) { return IS_ENABLED(CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK) || - __blk_crypto_cfg_supported(q->crypto_profile, cfg); + __blk_crypto_cfg_supported(bdev_get_queue(bdev)->crypto_profile, + cfg); } /** * blk_crypto_start_using_key() - Start using a blk_crypto_key on a device + * @bdev: block device to operate on * @key: A key to use on the device - * @q: the request queue for the device * * Upper layers must call this function to ensure that either the hardware * supports the key's crypto settings, or the crypto API fallback has transforms @@ -379,10 +380,11 @@ bool blk_crypto_config_supported(struct request_queue *q, * blk-crypto-fallback is either disabled or the needed algorithm * is disabled in the crypto API; or another -errno code. */ -int blk_crypto_start_using_key(const struct blk_crypto_key *key, - struct request_queue *q) +int blk_crypto_start_using_key(struct block_device *bdev, + const struct blk_crypto_key *key) { - if (__blk_crypto_cfg_supported(q->crypto_profile, &key->crypto_cfg)) + if (__blk_crypto_cfg_supported(bdev_get_queue(bdev)->crypto_profile, + &key->crypto_cfg)) return 0; return blk_crypto_fallback_start_using_mode(key->crypto_cfg.crypto_mode); } @@ -390,7 +392,7 @@ int blk_crypto_start_using_key(const struct blk_crypto_key *key, /** * blk_crypto_evict_key() - Evict a key from any inline encryption hardware * it may have been programmed into - * @q: The request queue who's associated inline encryption hardware this key + * @bdev: The block_device who's associated inline encryption hardware this key * might have been programmed into * @key: The key to evict * @@ -400,9 +402,11 @@ int blk_crypto_start_using_key(const struct blk_crypto_key *key, * * Return: 0 on success or if the key wasn't in any keyslot; -errno on error. */ -int blk_crypto_evict_key(struct request_queue *q, +int blk_crypto_evict_key(struct block_device *bdev, const struct blk_crypto_key *key) { + struct request_queue *q = bdev_get_queue(bdev); + if (__blk_crypto_cfg_supported(q->crypto_profile, &key->crypto_cfg)) return __blk_crypto_evict_key(q->crypto_profile, key); diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 078da18bb86d8..8541d5688f3a6 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1215,7 +1215,7 @@ static int dm_keyslot_evict_callback(struct dm_target *ti, struct dm_dev *dev, struct dm_keyslot_evict_args *args = data; int err; - err = blk_crypto_evict_key(bdev_get_queue(dev->bdev), args->key); + err = blk_crypto_evict_key(dev->bdev, args->key); if (!args->err) args->err = err; /* Always try to evict the key from all devices. */ diff --git a/fs/crypto/inline_crypt.c b/fs/crypto/inline_crypt.c index cea8b14007e6a..55c4d8c23d30d 100644 --- a/fs/crypto/inline_crypt.c +++ b/fs/crypto/inline_crypt.c @@ -139,8 +139,7 @@ int fscrypt_select_encryption_impl(struct fscrypt_info *ci) return PTR_ERR(devs); for (i = 0; i < num_devs; i++) { - if (!blk_crypto_config_supported(bdev_get_queue(devs[i]), - &crypto_cfg)) + if (!blk_crypto_config_supported(devs[i], &crypto_cfg)) goto out_free_devs; } @@ -184,8 +183,7 @@ int fscrypt_prepare_inline_crypt_key(struct fscrypt_prepared_key *prep_key, goto fail; } for (i = 0; i < num_devs; i++) { - err = blk_crypto_start_using_key(blk_key, - bdev_get_queue(devs[i])); + err = blk_crypto_start_using_key(devs[i], blk_key); if (err) break; } @@ -224,7 +222,7 @@ void fscrypt_destroy_inline_crypt_key(struct super_block *sb, devs = fscrypt_get_devices(sb, &num_devs); if (!IS_ERR(devs)) { for (i = 0; i < num_devs; i++) - blk_crypto_evict_key(bdev_get_queue(devs[i]), blk_key); + blk_crypto_evict_key(devs[i], blk_key); kfree(devs); } kfree_sensitive(blk_key); diff --git a/include/linux/blk-crypto.h b/include/linux/blk-crypto.h index 69b24fe92cbf1..b314e2febcaf5 100644 --- a/include/linux/blk-crypto.h +++ b/include/linux/blk-crypto.h @@ -94,13 +94,13 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key, unsigned int dun_bytes, unsigned int data_unit_size); -int blk_crypto_start_using_key(const struct blk_crypto_key *key, - struct request_queue *q); +int blk_crypto_start_using_key(struct block_device *bdev, + const struct blk_crypto_key *key); -int blk_crypto_evict_key(struct request_queue *q, +int blk_crypto_evict_key(struct block_device *bdev, const struct blk_crypto_key *key); -bool blk_crypto_config_supported(struct request_queue *q, +bool blk_crypto_config_supported(struct block_device *bdev, const struct blk_crypto_config *cfg); #else /* CONFIG_BLK_INLINE_ENCRYPTION */