From patchwork Tue Nov 30 04:03:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 12646323 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 4FD3EC433EF for ; Tue, 30 Nov 2021 04:05:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238082AbhK3EIn (ORCPT ); Mon, 29 Nov 2021 23:08:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230427AbhK3EIm (ORCPT ); Mon, 29 Nov 2021 23:08:42 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61076C061574; Mon, 29 Nov 2021 20:05:24 -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 ams.source.kernel.org (Postfix) with ESMTPS id 2516DB811FF; Tue, 30 Nov 2021 04:05:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A9180C53FC1; Tue, 30 Nov 2021 04:05:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1638245121; bh=a1liu2Lo3sMfRhCcP9f3gWfgoXAydt5G60CI7Sx/zkI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EUR9YgE8gOCFkseE2T9VubdkQlpzKqiCFRjZhcDlQ0ajPbaD2bYnY9Lmk63AZCJcw KqpoGKRUwVGuU+eFvEhp44poaIzAR/wl0xODYqy1BmRaLZlXAzDLFGMYqQ2WU9A/mu pIkSNRvWYGAPGNSZ0y5spllEimYnzwa08wYwtfC+pNi2cBiIuLqMHbRPesTNAQ8cEh OhJZqXlGYIm0Iu/kaWdQRUE0bmk3qESF4pTijllTvnPXNxxhotag/kYP0pFkw58TMv 20ONYzB2fXvOHl/cY+L8YivHKBCynSc87nEpvvJFLKYwTg9dr0ESMyuZys+VjVmU3z IdV7YhScBC9BA== From: Eric Biggers To: linux-block@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-scsi@vger.kernel.org, linux-mmc@vger.kernel.org, Greg Kroah-Hartman , Bart Van Assche Subject: [PATCH v2 1/3] block: simplify calling convention of elv_unregister_queue() Date: Mon, 29 Nov 2021 20:03:04 -0800 Message-Id: <20211130040306.148925-2-ebiggers@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211130040306.148925-1-ebiggers@kernel.org> References: <20211130040306.148925-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Eric Biggers Make elv_unregister_queue() a no-op if q->elevator is NULL or is not registered. This simplifies the existing callers, as well as the future caller in the error path of blk_register_queue(). Also don't bother checking whether q is NULL, since it never is. Signed-off-by: Eric Biggers Reviewed-by: Hannes Reinecke --- block/blk-sysfs.c | 3 +-- block/elevator.c | 8 ++++---- 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 4622da4bb9927..91d3805a6ec6b 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -957,8 +957,7 @@ void blk_unregister_queue(struct gendisk *disk) blk_trace_remove_sysfs(disk_to_dev(disk)); mutex_lock(&q->sysfs_lock); - if (q->elevator) - elv_unregister_queue(q); + elv_unregister_queue(q); disk_unregister_independent_access_ranges(disk); mutex_unlock(&q->sysfs_lock); mutex_unlock(&q->sysfs_dir_lock); diff --git a/block/elevator.c b/block/elevator.c index ec98aed39c4f5..b062c5bc10b9a 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -516,9 +516,11 @@ int elv_register_queue(struct request_queue *q, bool uevent) void elv_unregister_queue(struct request_queue *q) { + struct elevator_queue *e = q->elevator; + lockdep_assert_held(&q->sysfs_lock); - if (q) { + if (e && e->registered) { struct elevator_queue *e = q->elevator; kobject_uevent(&e->kobj, KOBJ_REMOVE); @@ -593,9 +595,7 @@ int elevator_switch_mq(struct request_queue *q, lockdep_assert_held(&q->sysfs_lock); if (q->elevator) { - if (q->elevator->registered) - elv_unregister_queue(q); - + elv_unregister_queue(q); ioc_clear_queue(q); blk_mq_sched_free_rqs(q); elevator_exit(q); From patchwork Tue Nov 30 04:03:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 12646325 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 36105C433F5 for ; Tue, 30 Nov 2021 04:05:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238092AbhK3EIo (ORCPT ); Mon, 29 Nov 2021 23:08:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238084AbhK3EIn (ORCPT ); Mon, 29 Nov 2021 23:08:43 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E81B0C061714; Mon, 29 Nov 2021 20:05:24 -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 ams.source.kernel.org (Postfix) with ESMTPS id 9A7EFB816D6; Tue, 30 Nov 2021 04:05:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FBA5C53FCB; Tue, 30 Nov 2021 04:05:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1638245122; bh=M0sQRTxbyS0q3abkpmgvNfkIhDxP38RRMZpip4Rf994=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e9gV/YgK6uofnNU7EwGYWKR0A7JaSfTqv062khzJ44S5rbCDQXzm5ZAwoXIDlDLSD RzDuNN4UKB2cWFwsNtlYUVsMDAe3cjwMRszHLS1+mkJt/kA+E7EimokcfItSGTopxF ACsMkA1BWWj3QnUR0vJM1aKNnvVXGm2cyCbD9v5Gpn2MGz1QgbLCCfd+QcOBp+Mfc1 kxoz/VX0wCc3Af/IOM59nycq197z0sWKUUjOgN6jPM7oO7/EpuN9ALuEW2bK8gsmG9 n2BKhoPOvjMitx532ps3aY6BQqvzrEtjzYP7HNOWmQEDRbIkkX/WPNpAwKjlL+JBqc ZQjRhRFe/TJpw== From: Eric Biggers To: linux-block@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-scsi@vger.kernel.org, linux-mmc@vger.kernel.org, Greg Kroah-Hartman , Bart Van Assche Subject: [PATCH v2 2/3] block: don't delete queue kobject before its children Date: Mon, 29 Nov 2021 20:03:05 -0800 Message-Id: <20211130040306.148925-3-ebiggers@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211130040306.148925-1-ebiggers@kernel.org> References: <20211130040306.148925-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Eric Biggers kobjects aren't supposed to be deleted before their child kobjects are deleted. Apparently this is usually benign; however, a WARN will be triggered if one of the child kobjects has a named attribute group: sysfs group 'modes' not found for kobject 'crypto' WARNING: CPU: 0 PID: 1 at fs/sysfs/group.c:278 sysfs_remove_group+0x72/0x80 ... Call Trace: sysfs_remove_groups+0x29/0x40 fs/sysfs/group.c:312 __kobject_del+0x20/0x80 lib/kobject.c:611 kobject_cleanup+0xa4/0x140 lib/kobject.c:696 kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x53/0x70 lib/kobject.c:753 blk_crypto_sysfs_unregister+0x10/0x20 block/blk-crypto-sysfs.c:159 blk_unregister_queue+0xb0/0x110 block/blk-sysfs.c:962 del_gendisk+0x117/0x250 block/genhd.c:610 Fix this by moving the kobject_del() and the corresponding kobject_uevent() to the correct place. Fixes: 2c2086afc2b8 ("block: Protect less code with sysfs_lock in blk_{un,}register_queue()") Signed-off-by: Eric Biggers Reviewed-by: Hannes Reinecke Reviewed-by: Greg Kroah-Hartman --- block/blk-sysfs.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 91d3805a6ec6b..1368dfe3ee500 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -951,15 +951,17 @@ void blk_unregister_queue(struct gendisk *disk) */ if (queue_is_mq(q)) blk_mq_unregister_dev(disk_to_dev(disk), q); - - kobject_uevent(&q->kobj, KOBJ_REMOVE); - kobject_del(&q->kobj); blk_trace_remove_sysfs(disk_to_dev(disk)); mutex_lock(&q->sysfs_lock); elv_unregister_queue(q); disk_unregister_independent_access_ranges(disk); mutex_unlock(&q->sysfs_lock); + + /* Now that all child objects were deleted, the queue can be deleted. */ + kobject_uevent(&q->kobj, KOBJ_REMOVE); + kobject_del(&q->kobj); + mutex_unlock(&q->sysfs_dir_lock); kobject_put(&disk_to_dev(disk)->kobj); From patchwork Tue Nov 30 04:03:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 12646327 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 22F2DC4167B for ; Tue, 30 Nov 2021 04:05:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238107AbhK3EIp (ORCPT ); Mon, 29 Nov 2021 23:08:45 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:56112 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238076AbhK3EIo (ORCPT ); Mon, 29 Nov 2021 23:08:44 -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 ams.source.kernel.org (Postfix) with ESMTPS id EE303B816D4; Tue, 30 Nov 2021 04:05:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B69BC53FCC; Tue, 30 Nov 2021 04:05:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1638245122; bh=lKaa1qlBv99NCEVi9uAABuRUXGnQZKFfDc5zPf4SRb8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Jk8cc4kkKLkAlZsn+pekaxu0dlpjK7nl1wNKYKImTB9GYgVKpq2CvyKnyAUMbOK9t GjPelojkNv9lfwxNKYtPu3d/q0PCit9OXS0A5+79VO6zASYfwZXRX84gQYi/c8jiYx fhIWrSWb53WnSjJRHiL7++T9LO1XrifhdM93n+sQ+yDbyfofP/7UWjBsI1eqDNwx/s GW8jzw+zKvO3JFGOx1qKldp08HZOmN3UxX6xxz4Xp8NUuJIligy9CWZVpof2OG81F6 8QEd3Tb11TF3IY2iUekdQWpsyk11w39+C+93Lpr1DtvkMlPd7pt9+IuxnHzLqyxp1Q d4N39WuD78MqQ== From: Eric Biggers To: linux-block@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-scsi@vger.kernel.org, linux-mmc@vger.kernel.org, Greg Kroah-Hartman , Bart Van Assche Subject: [PATCH v2 3/3] blk-crypto: show crypto capabilities in sysfs Date: Mon, 29 Nov 2021 20:03:06 -0800 Message-Id: <20211130040306.148925-4-ebiggers@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211130040306.148925-1-ebiggers@kernel.org> References: <20211130040306.148925-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Eric Biggers Add sysfs files that expose the inline encryption capabilities of request queues: /sys/class/block/$disk/queue/crypto/max_dun_bits /sys/class/block/$disk/queue/crypto/modes/$mode /sys/class/block/$disk/queue/crypto/num_keyslots Userspace can use these new files to decide what encryption settings to use, or whether to use inline encryption at all. This also brings the crypto capabilities in line with the other queue properties, which are already discoverable via the queue directory in sysfs. Design notes: - Place the new files in a new subdirectory "crypto" to group them together and to avoid complicating the main "queue" directory. This also makes it possible to replace "crypto" with a symlink later if we ever make the blk_crypto_profiles into real kobjects (see below). - It was necessary to define a new kobject that corresponds to the crypto subdirectory. For now, this kobject just contains a pointer to the blk_crypto_profile. Note that multiple queues (and hence multiple such kobjects) may refer to the same blk_crypto_profile. An alternative design would more closely match the current kernel data structures: the blk_crypto_profile could be a kobject itself, located directly under the host controller device's kobject, while /sys/class/block/$disk/queue/crypto would be a symlink to it. I decided not to do that for now because it would require a lot more changes, such as no longer embedding blk_crypto_profile in other structures, and also because I'm not sure we can rule out moving the crypto capabilities into 'struct queue_limits' in the future. (Even if multiple queues share the same crypto engine, maybe the supported data unit sizes could differ due to other queue properties.) It would also still be possible to switch to that design later without breaking userspace, by replacing the directory with a symlink. - Use "max_dun_bits" instead of "max_dun_bytes". Currently, the kernel internally stores this value in bytes, but that's an implementation detail. It probably makes more sense to talk about this value in bits, and choosing bits is more future-proof. - "modes" is a sub-subdirectory, since there may be multiple supported crypto modes, and sysfs is supposed to have one value per file. - Each mode had to be named. The crypto API names like "xts(aes)" are not appropriate because they don't specify the key size. Therefore, I assigned new names. The exact names chosen are arbitrary, but they happen to match the names used in log messages in fs/crypto/. - The "num_keyslots" file is a bit different from the others in that it is only useful to know for performance reasons. However, it's included as it can still be useful. For example, a user might not want to use inline encryption if there aren't very many keyslots. Signed-off-by: Eric Biggers Reviewed-by: Hannes Reinecke --- Documentation/block/queue-sysfs.rst | 30 +++++ block/Makefile | 3 +- block/blk-crypto-internal.h | 12 ++ block/blk-crypto-sysfs.c | 172 ++++++++++++++++++++++++++++ block/blk-crypto.c | 3 + block/blk-sysfs.c | 6 + include/linux/blkdev.h | 1 + 7 files changed, 226 insertions(+), 1 deletion(-) create mode 100644 block/blk-crypto-sysfs.c diff --git a/Documentation/block/queue-sysfs.rst b/Documentation/block/queue-sysfs.rst index 3f569d5324857..252939f340459 100644 --- a/Documentation/block/queue-sysfs.rst +++ b/Documentation/block/queue-sysfs.rst @@ -24,6 +24,36 @@ or host-managed, chunk_sectors indicates the size in 512B sectors of the zones of the device, with the eventual exception of the last zone of the device which may be smaller. +crypto +------ +This subdirectory is present if the device supports inline encryption. +(See :ref:`Documentation/block/inline-encryption.rst `.) +This subdirectory contains the following files and subdirectories which describe +the inline encryption capabilities of the device: + +max_dun_bits (RO) +~~~~~~~~~~~~~~~~~ +The maximum length, in bits, of data unit numbers (DUNs) accepted by the device. + +modes +~~~~~ +This subdirectory contains one file (RO) per crypto mode the device supports. +Each such file contains a hexadecimal number that is a bitmask of the supported +data unit sizes, in bytes, for the crypto mode. + +The crypto modes that may be supported are: + +* AES-256-XTS +* AES-128-CBC-ESSIV +* Adiantum + +For example, if a device supports AES-256-XTS with data unit sizes of 512 and +4096 bytes, the file "AES-256-XTS" will be present and will contain "0x1200". + +num_keyslots (RO) +~~~~~~~~~~~~~~~~~ +The number of crypto keyslots the device has. + dax (RO) -------- This file indicates whether the device supports Direct Access (DAX), diff --git a/block/Makefile b/block/Makefile index f38eaa6129296..3950ecbc5c263 100644 --- a/block/Makefile +++ b/block/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_BLK_DEBUG_FS) += blk-mq-debugfs.o obj-$(CONFIG_BLK_DEBUG_FS_ZONED)+= blk-mq-debugfs-zoned.o obj-$(CONFIG_BLK_SED_OPAL) += sed-opal.o obj-$(CONFIG_BLK_PM) += blk-pm.o -obj-$(CONFIG_BLK_INLINE_ENCRYPTION) += blk-crypto.o blk-crypto-profile.o +obj-$(CONFIG_BLK_INLINE_ENCRYPTION) += blk-crypto.o blk-crypto-profile.o \ + blk-crypto-sysfs.o obj-$(CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK) += blk-crypto-fallback.o obj-$(CONFIG_BLOCK_HOLDER_DEPRECATED) += holder.o diff --git a/block/blk-crypto-internal.h b/block/blk-crypto-internal.h index 2fb0d65a464ca..e6818ffaddbf8 100644 --- a/block/blk-crypto-internal.h +++ b/block/blk-crypto-internal.h @@ -11,6 +11,7 @@ /* Represents a crypto mode supported by blk-crypto */ struct blk_crypto_mode { + const char *name; /* name of this mode, shown in sysfs */ const char *cipher_str; /* crypto API name (for fallback case) */ unsigned int keysize; /* key size in bytes */ unsigned int ivsize; /* iv size in bytes */ @@ -20,6 +21,10 @@ extern const struct blk_crypto_mode blk_crypto_modes[]; #ifdef CONFIG_BLK_INLINE_ENCRYPTION +int blk_crypto_sysfs_register(struct request_queue *q); + +void blk_crypto_sysfs_unregister(struct request_queue *q); + void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE], unsigned int inc); @@ -62,6 +67,13 @@ static inline bool blk_crypto_rq_is_encrypted(struct request *rq) #else /* CONFIG_BLK_INLINE_ENCRYPTION */ +static inline int blk_crypto_sysfs_register(struct request_queue *q) +{ + return 0; +} + +static inline void blk_crypto_sysfs_unregister(struct request_queue *q) { } + static inline bool bio_crypt_rq_ctx_compatible(struct request *rq, struct bio *bio) { diff --git a/block/blk-crypto-sysfs.c b/block/blk-crypto-sysfs.c new file mode 100644 index 0000000000000..5997d3c288ec0 --- /dev/null +++ b/block/blk-crypto-sysfs.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2021 Google LLC + * + * sysfs support for blk-crypto. This file contains the code which exports the + * crypto capabilities of devices via /sys/class/block/$disk/queue/crypto/. + */ + +#include + +#include "blk-crypto-internal.h" + +struct blk_crypto_kobj { + struct kobject kobj; + struct blk_crypto_profile *profile; +}; + +struct blk_crypto_attr { + struct attribute attr; + ssize_t (*show)(struct blk_crypto_profile *profile, + struct blk_crypto_attr *attr, char *page); +}; + +static struct blk_crypto_profile *kobj_to_crypto_profile(struct kobject *kobj) +{ + return container_of(kobj, struct blk_crypto_kobj, kobj)->profile; +} + +static struct blk_crypto_attr *attr_to_crypto_attr(struct attribute *attr) +{ + return container_of(attr, struct blk_crypto_attr, attr); +} + +static ssize_t max_dun_bits_show(struct blk_crypto_profile *profile, + struct blk_crypto_attr *attr, char *page) +{ + return sysfs_emit(page, "%u\n", 8 * profile->max_dun_bytes_supported); +} + +static ssize_t num_keyslots_show(struct blk_crypto_profile *profile, + struct blk_crypto_attr *attr, char *page) +{ + return sysfs_emit(page, "%u\n", profile->num_slots); +} + +#define BLK_CRYPTO_RO_ATTR(_name) \ + static struct blk_crypto_attr _name##_attr = __ATTR_RO(_name) + +BLK_CRYPTO_RO_ATTR(max_dun_bits); +BLK_CRYPTO_RO_ATTR(num_keyslots); + +static struct attribute *blk_crypto_attrs[] = { + &max_dun_bits_attr.attr, + &num_keyslots_attr.attr, + NULL, +}; + +static const struct attribute_group blk_crypto_attr_group = { + .attrs = blk_crypto_attrs, +}; + +/* + * The encryption mode attributes. To avoid hard-coding the list of encryption + * modes, these are initialized at boot time by blk_crypto_sysfs_init(). + */ +static struct blk_crypto_attr __blk_crypto_mode_attrs[BLK_ENCRYPTION_MODE_MAX]; +static struct attribute *blk_crypto_mode_attrs[BLK_ENCRYPTION_MODE_MAX + 1]; + +static umode_t blk_crypto_mode_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct blk_crypto_profile *profile = kobj_to_crypto_profile(kobj); + struct blk_crypto_attr *a = attr_to_crypto_attr(attr); + int mode_num = a - __blk_crypto_mode_attrs; + + if (profile->modes_supported[mode_num]) + return 0444; + return 0; +} + +static ssize_t blk_crypto_mode_show(struct blk_crypto_profile *profile, + struct blk_crypto_attr *attr, char *page) +{ + int mode_num = attr - __blk_crypto_mode_attrs; + + return sysfs_emit(page, "0x%x\n", profile->modes_supported[mode_num]); +} + +static const struct attribute_group blk_crypto_modes_attr_group = { + .name = "modes", + .attrs = blk_crypto_mode_attrs, + .is_visible = blk_crypto_mode_is_visible, +}; + +static const struct attribute_group *blk_crypto_attr_groups[] = { + &blk_crypto_attr_group, + &blk_crypto_modes_attr_group, + NULL, +}; + +static ssize_t blk_crypto_attr_show(struct kobject *kobj, + struct attribute *attr, char *page) +{ + struct blk_crypto_profile *profile = kobj_to_crypto_profile(kobj); + struct blk_crypto_attr *a = attr_to_crypto_attr(attr); + + return a->show(profile, a, page); +} + +static const struct sysfs_ops blk_crypto_attr_ops = { + .show = blk_crypto_attr_show, +}; + +static void blk_crypto_release(struct kobject *kobj) +{ + kfree(container_of(kobj, struct blk_crypto_kobj, kobj)); +} + +static struct kobj_type blk_crypto_ktype = { + .default_groups = blk_crypto_attr_groups, + .sysfs_ops = &blk_crypto_attr_ops, + .release = blk_crypto_release, +}; + +/* + * If the request_queue has a blk_crypto_profile, create the "crypto" + * subdirectory in sysfs (/sys/class/block/$disk/queue/crypto/). + */ +int blk_crypto_sysfs_register(struct request_queue *q) +{ + struct blk_crypto_kobj *obj; + int err; + + if (!q->crypto_profile) + return 0; + + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (!obj) + return -ENOMEM; + obj->profile = q->crypto_profile; + + err = kobject_init_and_add(&obj->kobj, &blk_crypto_ktype, &q->kobj, + "crypto"); + if (err) { + kobject_put(&obj->kobj); + return err; + } + q->crypto_kobject = &obj->kobj; + return 0; +} + +void blk_crypto_sysfs_unregister(struct request_queue *q) +{ + kobject_put(q->crypto_kobject); +} + +static int __init blk_crypto_sysfs_init(void) +{ + int i; + + BUILD_BUG_ON(BLK_ENCRYPTION_MODE_INVALID != 0); + for (i = 1; i < BLK_ENCRYPTION_MODE_MAX; i++) { + struct blk_crypto_attr *attr = &__blk_crypto_mode_attrs[i]; + + attr->attr.name = blk_crypto_modes[i].name; + attr->attr.mode = 0444; + attr->show = blk_crypto_mode_show; + blk_crypto_mode_attrs[i - 1] = &attr->attr; + } + return 0; +} +subsys_initcall(blk_crypto_sysfs_init); diff --git a/block/blk-crypto.c b/block/blk-crypto.c index ec9efeeeca918..f8a36c723a987 100644 --- a/block/blk-crypto.c +++ b/block/blk-crypto.c @@ -19,16 +19,19 @@ const struct blk_crypto_mode blk_crypto_modes[] = { [BLK_ENCRYPTION_MODE_AES_256_XTS] = { + .name = "AES-256-XTS", .cipher_str = "xts(aes)", .keysize = 64, .ivsize = 16, }, [BLK_ENCRYPTION_MODE_AES_128_CBC_ESSIV] = { + .name = "AES-128-CBC-ESSIV", .cipher_str = "essiv(cbc(aes),sha256)", .keysize = 16, .ivsize = 16, }, [BLK_ENCRYPTION_MODE_ADIANTUM] = { + .name = "Adiantum", .cipher_str = "adiantum(xchacha12,aes)", .keysize = 32, .ivsize = 32, diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 1368dfe3ee500..e551498a0a850 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -876,6 +876,10 @@ int blk_register_queue(struct gendisk *disk) goto put_dev; } + ret = blk_crypto_sysfs_register(q); + if (ret) + goto put_dev; + blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q); wbt_enable_default(q); blk_throtl_register_queue(q); @@ -907,6 +911,7 @@ int blk_register_queue(struct gendisk *disk) return ret; put_dev: + elv_unregister_queue(q); disk_unregister_independent_access_ranges(disk); mutex_unlock(&q->sysfs_lock); mutex_unlock(&q->sysfs_dir_lock); @@ -951,6 +956,7 @@ void blk_unregister_queue(struct gendisk *disk) */ if (queue_is_mq(q)) blk_mq_unregister_dev(disk_to_dev(disk), q); + blk_crypto_sysfs_unregister(q); blk_trace_remove_sysfs(disk_to_dev(disk)); mutex_lock(&q->sysfs_lock); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 0a4416ef4fbf8..1fed574e56133 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -261,6 +261,7 @@ struct request_queue { #ifdef CONFIG_BLK_INLINE_ENCRYPTION struct blk_crypto_profile *crypto_profile; + struct kobject *crypto_kobject; #endif unsigned int rq_timeout;