From patchwork Wed Oct 16 23:27:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13839058 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 780BB1D5156; Wed, 16 Oct 2024 23:28:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729121310; cv=none; b=T1I9DGFJThGTQD3Ad+0GpxMh36ltwhQDV/ZBtTFeAjNnHxjSnVybjQNKG8M5rFdqjNQAcL6EXiwGM9Ee8iIQYBanTZLhtf3IikCD/gfcH4GSsmtkrI0yyIG0Uom6buDcdsK2PO5HXZbrPKwA9gJkIw6bj3hhFVVPTyKm2Rxqzb0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729121310; c=relaxed/simple; bh=nI7UrqLsLdKByKriwY6w1+7j3MiucjYgOBqPVYBKIWg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Y0kNkuNoYfv1l6UklgDxU+1m48ZJQGnnJygZQ1Xrbamoo48FhCabPEKKdPTcqNaUAZlfBskdLvWejW1POU2RrYf8bPrtuKXF7D1tuPBZm4x8lDHG6gLWget4cMqCNVPU4XRjRw2K/Mlgf74C4NfFgHVpsIyDT9YxWNpRC9Jne+s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mdBFIHum; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mdBFIHum" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5A81C4CEC7; Wed, 16 Oct 2024 23:28:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729121310; bh=nI7UrqLsLdKByKriwY6w1+7j3MiucjYgOBqPVYBKIWg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mdBFIHumrDC1qXlga//Rb95nQRIC2Ax5pmEUNpeVJ0MpoTpb4Ma9La6p+TLEQj7C3 BFB2Z1e57iyiBoCqpKhjoF5WN3sF+8AUGkZC2GCrMrFYNxnd73Kmw4Dkf72gNDkzpt vmzhIP105zi7/1tsfdRhZ7luDAqfrvVqTHIz5NATxzqbJ92N7ZAMhiccQqgk6P7CsA qQtwaPt2eHgEpiqwRTXhQI6NZA43ZcF7cG4NTOj+U8vbi8FAQVYDkKKQBZdeXCgzHM zAwdKCLEHZuRHtMVKKa69QMaxIZUk/zPqIIa1mDHFABxDtbCvZhNpgqWkwqoiKWphP VTD57w/whGwEQ== From: Eric Biggers To: dm-devel@lists.linux.dev Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Md Sadre Alam , Israel Rukshin , Milan Broz , Mikulas Patocka Subject: [RFC PATCH v2 1/2] block: export blk-crypto symbols required by dm-inlinecrypt Date: Wed, 16 Oct 2024 16:27:47 -0700 Message-ID: <20241016232748.134211-2-ebiggers@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241016232748.134211-1-ebiggers@kernel.org> References: <20241016232748.134211-1-ebiggers@kernel.org> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Eric Biggers bio_crypt_set_ctx(), blk_crypto_init_key(), and blk_crypto_start_using_key() are needed to use inline encryption; see Documentation/block/inline-encryption.rst. Export them so that dm-inlinecrypt can use them. The only reason these weren't exported before was that inline encryption was previously used only by fs/crypto/ which is built-in code. Signed-off-by: Eric Biggers --- block/blk-crypto.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-crypto.c b/block/blk-crypto.c index 4d760b092deb9..5a121b1292f9a 100644 --- a/block/blk-crypto.c +++ b/block/blk-crypto.c @@ -104,10 +104,11 @@ void bio_crypt_set_ctx(struct bio *bio, const struct blk_crypto_key *key, bc->bc_key = key; memcpy(bc->bc_dun, dun, sizeof(bc->bc_dun)); bio->bi_crypt_context = bc; } +EXPORT_SYMBOL_GPL(bio_crypt_set_ctx); void __bio_crypt_free_ctx(struct bio *bio) { mempool_free(bio->bi_crypt_context, bio_crypt_ctx_pool); bio->bi_crypt_context = NULL; @@ -354,10 +355,11 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key, blk_key->size = mode->keysize; memcpy(blk_key->raw, raw_key, mode->keysize); return 0; } +EXPORT_SYMBOL_GPL(blk_crypto_init_key); bool blk_crypto_config_supported_natively(struct block_device *bdev, const struct blk_crypto_config *cfg) { return __blk_crypto_cfg_supported(bdev_get_queue(bdev)->crypto_profile, @@ -396,10 +398,11 @@ int blk_crypto_start_using_key(struct block_device *bdev, { if (blk_crypto_config_supported_natively(bdev, &key->crypto_cfg)) return 0; return blk_crypto_fallback_start_using_mode(key->crypto_cfg.crypto_mode); } +EXPORT_SYMBOL_GPL(blk_crypto_start_using_key); /** * blk_crypto_evict_key() - Evict a blk_crypto_key from a block_device * @bdev: a block_device on which I/O using the key may have been done * @key: the key to evict From patchwork Wed Oct 16 23:27:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13839059 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D7511D5164; Wed, 16 Oct 2024 23:28:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729121310; cv=none; b=ZKGPLn8uebicxr4YnbfC12/4hpFmX+1Ulmr5SzC1zzZxEswvuqaLVVniErXyS3IdTqo2EGIVEJBVtK6+t0OrLTpISwbAxJm3PR57c0h9QmIBpzlsErjed2xg1IPCW2XyFe7VanGGY7SJyqBn28vEJ/zt6VM7mRGokIp7xIrT2nY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729121310; c=relaxed/simple; bh=cOF4Fs1XsTHMvu6pL1SvvJiFeitKQbVtvbigWyYmDT0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Z7RdRgQsYQT73d8np5G0w59fruR9gPaIbjOwpP8x2Sgs8b9V9ItqgB5KR1mkYSDIioOVU34/88agOsEwyEAbIvVI4+1jJwcIfi/NOF/eOd2EY7uc8E1EA0DNc+55nLdMjByygf8IKm9W+vImtplfd27QyOlNB2dF5zfxVOPzh0g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ex5EmWlb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ex5EmWlb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2BDD9C4CECF; Wed, 16 Oct 2024 23:28:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729121310; bh=cOF4Fs1XsTHMvu6pL1SvvJiFeitKQbVtvbigWyYmDT0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ex5EmWlbWK+l7CZ10+wL7BZHe39QF/lm9cGpLvyY4VluyPPF4gv22KnmjYDzTeUh5 aWvqD8geXBfm4H+5P7WMmUjrnCkYVqHwmUecIND/qvmEuk2vF3h9+bYvYm4gDBS3Xe nruDYrw/aJL806CMH3HddThKrQb9Dx6mq4qBFD7gFzRI7Nuo7LipYQJv/uN1kvnc6u PLYmoO3qMoVvYksyi09jOWNtiDee4BwrvKRNERpGV97kd94q9wDlGbY+9w0M7L+nbK 4iH+MNDll1dYc/VJXUDPMrv/UqRCgi5/j0ThSAmSpVC93xu6rOKC3EKBc6aXFeTewM 4d87RKY5ejvzg== From: Eric Biggers To: dm-devel@lists.linux.dev Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Md Sadre Alam , Israel Rukshin , Milan Broz , Mikulas Patocka Subject: [RFC PATCH v2 2/2] dm-inlinecrypt: add target for inline block device encryption Date: Wed, 16 Oct 2024 16:27:48 -0700 Message-ID: <20241016232748.134211-3-ebiggers@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241016232748.134211-1-ebiggers@kernel.org> References: <20241016232748.134211-1-ebiggers@kernel.org> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Eric Biggers Add a new device-mapper target "dm-inlinecrypt" that is similar to dm-crypt but uses the blk-crypto API instead of the regular crypto API. This allows it to take advantage of inline encryption hardware such as that commonly built into UFS host controllers. The table syntax matches dm-crypt's, but for now only a stripped-down set of parameters is supported. For example, for now AES-256-XTS is the only supported cipher. dm-inlinecrypt is based on Android's dm-default-key with the controversial passthrough support removed. Note that due to the removal of passthrough support, use of dm-inlinecrypt in combination with fscrypt causes double encryption of file contents (similar to dm-crypt + fscrypt), with the fscrypt layer not being able to use the inline encryption hardware. This makes dm-inlinecrypt unusable on systems such as Android that use fscrypt and where a more optimized approach is needed. It is however suitable as a replacement for dm-crypt. Signed-off-by: Eric Biggers --- drivers/md/Kconfig | 10 + drivers/md/Makefile | 1 + drivers/md/dm-inlinecrypt.c | 417 ++++++++++++++++++++++++++++++++++++ 3 files changed, 428 insertions(+) create mode 100644 drivers/md/dm-inlinecrypt.c diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 1e9db8e4acdf6..caed60097a216 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -268,10 +268,20 @@ config DM_CRYPT To compile this code as a module, choose M here: the module will be called dm-crypt. If unsure, say N. +config DM_INLINECRYPT + tristate "Inline encryption target support" + depends on BLK_DEV_DM + depends on BLK_INLINE_ENCRYPTION + help + This device-mapper target is similar to dm-crypt, but it uses the + blk-crypto API instead of the regular crypto API. This allows it to + take advantage of inline encryption hardware such as that commonly + built into UFS host controllers. + config DM_SNAPSHOT tristate "Snapshot target" depends on BLK_DEV_DM select DM_BUFIO help diff --git a/drivers/md/Makefile b/drivers/md/Makefile index 476a214e4bdc2..6e44ff32b8af8 100644 --- a/drivers/md/Makefile +++ b/drivers/md/Makefile @@ -49,10 +49,11 @@ obj-$(CONFIG_BLK_DEV_DM) += dm-mod.o obj-$(CONFIG_BLK_DEV_DM_BUILTIN) += dm-builtin.o obj-$(CONFIG_DM_UNSTRIPED) += dm-unstripe.o obj-$(CONFIG_DM_BUFIO) += dm-bufio.o obj-$(CONFIG_DM_BIO_PRISON) += dm-bio-prison.o obj-$(CONFIG_DM_CRYPT) += dm-crypt.o +obj-$(CONFIG_DM_INLINECRYPT) += dm-inlinecrypt.o obj-$(CONFIG_DM_DELAY) += dm-delay.o obj-$(CONFIG_DM_DUST) += dm-dust.o obj-$(CONFIG_DM_FLAKEY) += dm-flakey.o obj-$(CONFIG_DM_MULTIPATH) += dm-multipath.o dm-round-robin.o obj-$(CONFIG_DM_MULTIPATH_QL) += dm-queue-length.o diff --git a/drivers/md/dm-inlinecrypt.c b/drivers/md/dm-inlinecrypt.c new file mode 100644 index 0000000000000..d6c2e6e1fdbbb --- /dev/null +++ b/drivers/md/dm-inlinecrypt.c @@ -0,0 +1,417 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2024 Google LLC + */ + +#include +#include +#include + +#define DM_MSG_PREFIX "inlinecrypt" + +static const struct dm_inlinecrypt_cipher { + const char *name; + enum blk_crypto_mode_num mode_num; + int key_size; +} dm_inlinecrypt_ciphers[] = { + { + .name = "aes-xts-plain64", + .mode_num = BLK_ENCRYPTION_MODE_AES_256_XTS, + .key_size = 64, + }, +}; + +/** + * struct inlinecrypt_ctx - private data of an inlinecrypt target + * @dev: the underlying device + * @start: starting sector of the range of @dev which this target actually maps. + * For this purpose a "sector" is 512 bytes. + * @cipher_string: the name of the encryption algorithm being used + * @iv_offset: starting offset for IVs. IVs are generated as if the target were + * preceded by @iv_offset 512-byte sectors. + * @sector_size: crypto sector size in bytes (usually 4096) + * @sector_bits: log2(sector_size) + * @key: the encryption key to use + * @max_dun: the maximum DUN that may be used (computed from other params) + */ +struct inlinecrypt_ctx { + struct dm_dev *dev; + sector_t start; + const char *cipher_string; + u64 iv_offset; + unsigned int sector_size; + unsigned int sector_bits; + struct blk_crypto_key key; + u64 max_dun; +}; + +static const struct dm_inlinecrypt_cipher * +lookup_cipher(const char *cipher_string) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(dm_inlinecrypt_ciphers); i++) { + if (strcmp(cipher_string, dm_inlinecrypt_ciphers[i].name) == 0) + return &dm_inlinecrypt_ciphers[i]; + } + return NULL; +} + +static void inlinecrypt_dtr(struct dm_target *ti) +{ + struct inlinecrypt_ctx *ctx = ti->private; + + if (ctx->dev) { + if (ctx->key.size) + blk_crypto_evict_key(ctx->dev->bdev, &ctx->key); + dm_put_device(ti, ctx->dev); + } + kfree_sensitive(ctx->cipher_string); + kfree_sensitive(ctx); +} + +static int inlinecrypt_ctr_optional(struct dm_target *ti, + unsigned int argc, char **argv) +{ + struct inlinecrypt_ctx *ctx = ti->private; + struct dm_arg_set as; + static const struct dm_arg _args[] = { + {0, 3, "Invalid number of feature args"}, + }; + unsigned int opt_params; + const char *opt_string; + bool iv_large_sectors = false; + char dummy; + int err; + + as.argc = argc; + as.argv = argv; + + err = dm_read_arg_group(_args, &as, &opt_params, &ti->error); + if (err) + return err; + + while (opt_params--) { + opt_string = dm_shift_arg(&as); + if (!opt_string) { + ti->error = "Not enough feature arguments"; + return -EINVAL; + } + if (!strcmp(opt_string, "allow_discards")) { + ti->num_discard_bios = 1; + } else if (sscanf(opt_string, "sector_size:%u%c", + &ctx->sector_size, &dummy) == 1) { + if (ctx->sector_size < SECTOR_SIZE || + ctx->sector_size > 4096 || + !is_power_of_2(ctx->sector_size)) { + ti->error = "Invalid sector_size"; + return -EINVAL; + } + } else if (!strcmp(opt_string, "iv_large_sectors")) { + iv_large_sectors = true; + } else { + ti->error = "Invalid feature arguments"; + return -EINVAL; + } + } + + /* dm-inlinecrypt doesn't implement iv_large_sectors=false. */ + if (ctx->sector_size != SECTOR_SIZE && !iv_large_sectors) { + ti->error = "iv_large_sectors must be specified"; + return -EINVAL; + } + + return 0; +} + +/* + * Construct an inlinecrypt mapping: + * + * + * This syntax matches dm-crypt's, but the set of supported functionality has + * been stripped down. + */ +static int inlinecrypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) +{ + struct inlinecrypt_ctx *ctx; + const struct dm_inlinecrypt_cipher *cipher; + u8 raw_key[BLK_CRYPTO_MAX_KEY_SIZE]; + unsigned int dun_bytes; + unsigned long long tmpll; + char dummy; + int err; + + if (argc < 5) { + ti->error = "Not enough arguments"; + return -EINVAL; + } + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) { + ti->error = "Out of memory"; + return -ENOMEM; + } + ti->private = ctx; + + /* */ + ctx->cipher_string = kstrdup(argv[0], GFP_KERNEL); + if (!ctx->cipher_string) { + ti->error = "Out of memory"; + err = -ENOMEM; + goto bad; + } + cipher = lookup_cipher(ctx->cipher_string); + if (!cipher) { + ti->error = "Unsupported cipher"; + err = -EINVAL; + goto bad; + } + + /* */ + if (strlen(argv[1]) != 2 * cipher->key_size) { + ti->error = "Incorrect key size for cipher"; + err = -EINVAL; + goto bad; + } + if (hex2bin(raw_key, argv[1], cipher->key_size) != 0) { + ti->error = "Malformed key string"; + err = -EINVAL; + goto bad; + } + + /* */ + if (sscanf(argv[2], "%llu%c", &ctx->iv_offset, &dummy) != 1) { + ti->error = "Invalid iv_offset sector"; + err = -EINVAL; + goto bad; + } + + /* */ + err = dm_get_device(ti, argv[3], dm_table_get_mode(ti->table), + &ctx->dev); + if (err) { + ti->error = "Device lookup failed"; + goto bad; + } + + /* */ + if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || + tmpll != (sector_t)tmpll) { + ti->error = "Invalid start sector"; + err = -EINVAL; + goto bad; + } + ctx->start = tmpll; + + /* optional arguments */ + ctx->sector_size = SECTOR_SIZE; + if (argc > 5) { + err = inlinecrypt_ctr_optional(ti, argc - 5, &argv[5]); + if (err) + goto bad; + } + ctx->sector_bits = ilog2(ctx->sector_size); + if (ti->len & ((ctx->sector_size >> SECTOR_SHIFT) - 1)) { + ti->error = "Device size is not a multiple of sector_size"; + err = -EINVAL; + goto bad; + } + + ctx->max_dun = (ctx->iv_offset + ti->len - 1) >> + (ctx->sector_bits - SECTOR_SHIFT); + dun_bytes = DIV_ROUND_UP(fls64(ctx->max_dun), 8); + + err = blk_crypto_init_key(&ctx->key, raw_key, cipher->mode_num, + dun_bytes, ctx->sector_size); + if (err) { + ti->error = "Error initializing blk-crypto key"; + goto bad; + } + + err = blk_crypto_start_using_key(ctx->dev->bdev, &ctx->key); + if (err) { + ti->error = "Error starting to use blk-crypto"; + goto bad; + } + + ti->num_flush_bios = 1; + + err = 0; + goto out; + +bad: + inlinecrypt_dtr(ti); +out: + memzero_explicit(raw_key, sizeof(raw_key)); + return err; +} + +static int inlinecrypt_map(struct dm_target *ti, struct bio *bio) +{ + const struct inlinecrypt_ctx *ctx = ti->private; + sector_t sector_in_target; + u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE] = {}; + + bio_set_dev(bio, ctx->dev->bdev); + + /* + * If the bio is a device-level request which doesn't target a specific + * sector, there's nothing more to do. + */ + if (bio_sectors(bio) == 0) + return DM_MAPIO_REMAPPED; + + /* + * The bio should never have an encryption context already, since + * dm-inlinecrypt doesn't pass through any inline encryption + * capabilities to the layer above it. + */ + if (WARN_ON_ONCE(bio_has_crypt_ctx(bio))) + return DM_MAPIO_KILL; + + /* Map the bio's sector to the underlying device. (512-byte sectors) */ + sector_in_target = dm_target_offset(ti, bio->bi_iter.bi_sector); + bio->bi_iter.bi_sector = ctx->start + sector_in_target; + + /* Calculate the DUN and enforce data-unit (crypto sector) alignment. */ + dun[0] = ctx->iv_offset + sector_in_target; /* 512-byte sectors */ + if (dun[0] & ((ctx->sector_size >> SECTOR_SHIFT) - 1)) + return DM_MAPIO_KILL; + dun[0] >>= ctx->sector_bits - SECTOR_SHIFT; /* crypto sectors */ + + /* + * This check isn't necessary as we should have calculated max_dun + * correctly, but be safe. + */ + if (WARN_ON_ONCE(dun[0] > ctx->max_dun)) + return DM_MAPIO_KILL; + + bio_crypt_set_ctx(bio, &ctx->key, dun, GFP_NOIO); + + return DM_MAPIO_REMAPPED; +} + +static void inlinecrypt_status(struct dm_target *ti, status_type_t type, + unsigned int status_flags, char *result, + unsigned int maxlen) +{ + const struct inlinecrypt_ctx *ctx = ti->private; + unsigned int sz = 0; + int num_feature_args = 0; + + switch (type) { + case STATUSTYPE_INFO: + case STATUSTYPE_IMA: + result[0] = '\0'; + break; + + case STATUSTYPE_TABLE: + /* + * Warning: like dm-crypt, dm-inlinecrypt includes the key in + * the returned table. Userspace is responsible for redacting + * the key when needed. + */ + DMEMIT("%s %*phN %llu %s %llu", ctx->cipher_string, + ctx->key.size, ctx->key.raw, ctx->iv_offset, + ctx->dev->name, ctx->start); + num_feature_args += !!ti->num_discard_bios; + if (ctx->sector_size != SECTOR_SIZE) + num_feature_args += 2; + if (num_feature_args != 0) { + DMEMIT(" %d", num_feature_args); + if (ti->num_discard_bios) + DMEMIT(" allow_discards"); + if (ctx->sector_size != SECTOR_SIZE) { + DMEMIT(" sector_size:%u", ctx->sector_size); + DMEMIT(" iv_large_sectors"); + } + } + break; + } +} + +static int inlinecrypt_prepare_ioctl(struct dm_target *ti, + struct block_device **bdev) +{ + const struct inlinecrypt_ctx *ctx = ti->private; + const struct dm_dev *dev = ctx->dev; + + *bdev = dev->bdev; + + /* Only pass ioctls through if the device sizes match exactly. */ + return ctx->start != 0 || ti->len != bdev_nr_sectors(dev->bdev); +} + +static int inlinecrypt_iterate_devices(struct dm_target *ti, + iterate_devices_callout_fn fn, + void *data) +{ + const struct inlinecrypt_ctx *ctx = ti->private; + + return fn(ti, ctx->dev, ctx->start, ti->len, data); +} + +#ifdef CONFIG_BLK_DEV_ZONED +static int inlinecrypt_report_zones(struct dm_target *ti, + struct dm_report_zones_args *args, + unsigned int nr_zones) +{ + const struct inlinecrypt_ctx *ctx = ti->private; + + return dm_report_zones(ctx->dev->bdev, ctx->start, + ctx->start + dm_target_offset(ti, args->next_sector), + args, nr_zones); +} +#else +#define inlinecrypt_report_zones NULL +#endif + +static void inlinecrypt_io_hints(struct dm_target *ti, + struct queue_limits *limits) +{ + const struct inlinecrypt_ctx *ctx = ti->private; + const unsigned int sector_size = ctx->sector_size; + + limits->logical_block_size = + max_t(unsigned int, limits->logical_block_size, sector_size); + limits->physical_block_size = + max_t(unsigned int, limits->physical_block_size, sector_size); + limits->io_min = max_t(unsigned int, limits->io_min, sector_size); + limits->dma_alignment = limits->logical_block_size - 1; +} + +static struct target_type inlinecrypt_target = { + .name = "inlinecrypt", + .version = {1, 0, 0}, + /* + * Do not set DM_TARGET_PASSES_CRYPTO, since dm-inlinecrypt consumes the + * crypto capability itself. + */ + .features = DM_TARGET_ZONED_HM, + .module = THIS_MODULE, + .ctr = inlinecrypt_ctr, + .dtr = inlinecrypt_dtr, + .map = inlinecrypt_map, + .status = inlinecrypt_status, + .prepare_ioctl = inlinecrypt_prepare_ioctl, + .iterate_devices = inlinecrypt_iterate_devices, + .report_zones = inlinecrypt_report_zones, + .io_hints = inlinecrypt_io_hints, +}; + +static int __init dm_inlinecrypt_init(void) +{ + return dm_register_target(&inlinecrypt_target); +} + +static void __exit dm_inlinecrypt_exit(void) +{ + dm_unregister_target(&inlinecrypt_target); +} + +module_init(dm_inlinecrypt_init); +module_exit(dm_inlinecrypt_exit); + +MODULE_AUTHOR("Eric Biggers "); +MODULE_DESCRIPTION(DM_NAME " target for inline encryption"); +MODULE_LICENSE("GPL");