From patchwork Thu Aug 22 03:35:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 13772593 Received: from mail-wr1-f44.google.com (mail-wr1-f44.google.com [209.85.221.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 97134364A4; Thu, 22 Aug 2024 03:35:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.44 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724297744; cv=none; b=SkOCK08jF6XesaFbzn8kMiEcVSSSJWlaesYdIdLQ9SmuegsUxcpxgidZFXsJNYl5C5xz3CuzoIxln1Cl5ZCyiG9KF9bAf+yhT8hHH7+xU2c1nmCuHExEE3nNvFw+U/URKAW2sO6rm2dWPigq+mAPfcljGt5AW3K5f50yNK1yCh4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724297744; c=relaxed/simple; bh=eor95KyuHkxSooEEY/l0Xm4XcRE0Im5ZycLWR04WdVo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KTp5irfDlezLeOvvHCE772ptHV2o7/7Zvb/dPwbVc+h0XT56GSy8GXa33Er0hu3qYpqh4SukqBgg489dMk/m5sI7S0V1BEn5Bgp5qp+7eWJC/HCNx6wTLHUIRllNUtKp7zaChSodL6FTWuMCmVvq+44R9jOqH6Ak+dpL6gO+rTw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=XyPh/weC; arc=none smtp.client-ip=209.85.221.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XyPh/weC" Received: by mail-wr1-f44.google.com with SMTP id ffacd0b85a97d-37182eee02dso163163f8f.1; Wed, 21 Aug 2024 20:35:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1724297740; x=1724902540; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=G7yUgVOy5MpRKfji6spWllEFui/I+HP/hnabDQ6U+Y0=; b=XyPh/weC9qV9n9T8M+iLxbtd+ztGWBiqkNFa643i4LsCQ0IfZIDFvcqqc3z58/5sH9 YpQ+LrnLjo2P3JLwv0hNO0+VuhsC8ZaylbBEuVXQQ71kV1ZRtOOjXjFsXFyKh95YmZG5 MKGHughWbjMfoMxP1blpH7+PqptE4dWI7UH5NRrmd4Q9l+lcPgf4JYWT2/0jlmKLfvB/ lBnNB6I3wWTefzm5i7kdSSv55PPvQa1JmhiJcAPZgNM9PJ3GunP1oDwF7/yZLpou3fPN mOCgGpkDVl7af6Xx28BGTJeszrF2VfCWUEbSPOYQwu4bg3LfXXZyu9QLP7clODz7/QJ/ 904w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724297740; x=1724902540; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=G7yUgVOy5MpRKfji6spWllEFui/I+HP/hnabDQ6U+Y0=; b=VK0wmcnEox/t6bmoX/JBfKWQHOoGpG6oxwBsxru7YcGjWj/nGHBFO+oz8FJK0rWNhg MMzqO06dgsjSWZ1DrLwO2nDIEKaRaF4PnHfW2ru6r3rwvgWXXv/n+Fu/dQ3rB8Y8BKVM GTn5IKSE/CEGVX2351R9eEM1DBlUOICMgb5CLYAG5mIyJiAYFlKzGkStJgr76+UL3lEf ji/mTJYx6ILXDFXCLMkkXqVgsH8XCTH9fcRTQNTCZvz/f+xYV3q9M1jc3KqucIKjqmxY MS4OUQwWJXvl7Egvh1JEj3HJZBT8YXBzVkFePl7hUk6w7dI42WlytVjXtkiLxsCB2XzE 5Otw== X-Forwarded-Encrypted: i=1; AJvYcCV+WGoVOTNLs5yMqtus5bF/PUl7HHQUf7rAwbNrWrHaOwNn9CBiuC3xgM/dEc1RUIkhEL5h+N8wPJv8yQ==@vger.kernel.org X-Gm-Message-State: AOJu0YxPnPf00X1puP7fOsZ999E/ctP5+IToeSucXxTQlv1MGN7K8Mdf CfnWNujdmHVC1hjyMb6GbUX48KT3niiD6VB80+kuNdgh48suZZVLQe6JJw== X-Google-Smtp-Source: AGHT+IFHlvWFFCxl8YjFlJaGHJvsG1W8kc3fcAPScv4ZmRwi4I8WRIgqdUzhutwlfp/55qdQx9eetw== X-Received: by 2002:a5d:4487:0:b0:365:aec0:e191 with SMTP id ffacd0b85a97d-373052b4b25mr815314f8f.21.1724297740108; Wed, 21 Aug 2024 20:35:40 -0700 (PDT) Received: from 127.0.0.1localhost ([148.252.128.6]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42abefc626fsm45491995e9.31.2024.08.21.20.35.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Aug 2024 20:35:39 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com, Conrad Meyer , linux-block@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2 4/7] block: introduce blk_validate_write() Date: Thu, 22 Aug 2024 04:35:54 +0100 Message-ID: <2ef85c782997ad40e923e7640039e0c7795e19da.1724297388.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In preparation to further changes extract a helper function out of blk_ioctl_discard() that validates if it's allowed to do a write-like operation for the given range. Signed-off-by: Pavel Begunkov --- block/ioctl.c | 47 +++++++++++++++++++++++++++++------------------ 1 file changed, 29 insertions(+), 18 deletions(-) diff --git a/block/ioctl.c b/block/ioctl.c index e8e4a4190f18..8df0bc8002f5 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -92,38 +92,49 @@ static int compat_blkpg_ioctl(struct block_device *bdev, } #endif +static int blk_validate_write(struct block_device *bdev, blk_mode_t mode, + uint64_t start, uint64_t len) +{ + unsigned int bs_mask; + uint64_t end; + + if (!(mode & BLK_OPEN_WRITE)) + return -EBADF; + if (bdev_read_only(bdev)) + return -EPERM; + + bs_mask = bdev_logical_block_size(bdev) - 1; + if ((start | len) & bs_mask) + return -EINVAL; + if (!len) + return -EINVAL; + + if (check_add_overflow(start, len, &end) || end > bdev_nr_bytes(bdev)) + return -EINVAL; + + return 0; +} + static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, unsigned long arg) { - unsigned int bs_mask = bdev_logical_block_size(bdev) - 1; - uint64_t range[2], start, len, end; + uint64_t range[2], start, len; struct bio *prev = NULL, *bio; sector_t sector, nr_sects; struct blk_plug plug; int err; - if (!(mode & BLK_OPEN_WRITE)) - return -EBADF; - - if (!bdev_max_discard_sectors(bdev)) - return -EOPNOTSUPP; - if (bdev_read_only(bdev)) - return -EPERM; - if (copy_from_user(range, (void __user *)arg, sizeof(range))) return -EFAULT; - start = range[0]; len = range[1]; - if (!len) - return -EINVAL; - if ((start | len) & bs_mask) - return -EINVAL; + if (!bdev_max_discard_sectors(bdev)) + return -EOPNOTSUPP; - if (check_add_overflow(start, len, &end) || - end > bdev_nr_bytes(bdev)) - return -EINVAL; + err = blk_validate_write(bdev, mode, start, len); + if (err) + return err; filemap_invalidate_lock(bdev->bd_mapping); err = truncate_bdev_range(bdev, mode, start, start + len - 1);