From nobody Sat Feb 7 06:18:12 2026 Received: from mail-io1-f43.google.com (mail-io1-f43.google.com [209.85.166.43]) (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 808A214012 for ; Thu, 11 Apr 2024 15:31:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.43 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712849497; cv=none; b=DEHQWORCzoWjPFY1BRbYgFM8PD1xHCa18iG1Qr6VfUsVlOVHRlGH17e6hQz2dRC+KXftiOrursLtDqTiXnEyKiVby7l4Q8cd39cH+uOYx1ypSW9ifIDdHnNgVJAdbeeIvM6dYEjqVczHHzc6lFS52z5/GElpWNIgRzDxwLLiBo8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712849497; c=relaxed/simple; bh=cxewkZyxRElYmBVpDBfnzLzE9Qi5Af8AY4SLKQB4suA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GOH4HaqEG7+OXohWipOJFkxWzxRjU5bDOsawEASjE25REGCGWasL0q6VIuntDe9EcjeIvE/VWCfpWvNvJElPnNNVe6sGD+kuJ4h1sIWy5DZ/wFXpOvC48DFpe2jwNQnPvDgGgNELrMPPA1WBqYuwaxIApt4Et7dczT2RzgXS720= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk; spf=pass smtp.mailfrom=kernel.dk; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b=MLiTucjT; arc=none smtp.client-ip=209.85.166.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kernel.dk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b="MLiTucjT" Received: by mail-io1-f43.google.com with SMTP id ca18e2360f4ac-7cb9dd46babso81829539f.1 for ; Thu, 11 Apr 2024 08:31:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20230601.gappssmtp.com; s=20230601; t=1712849493; x=1713454293; 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=vF7rljSyWSXVyabtJWrttCeWBftBj9OG2VAhwMADVj4=; b=MLiTucjTPhCwJzW9rX0LyKeyiRyQUbPdoxj9gdxUu77bbcfASnAxVUJpRMvGtk/0gQ hT8qihVirZS91vexQSXDN+Mm5a+mA65PKuhOQBVJNyhjOCE6qfNr07qqJmAnU8p1nKBY /TYquLI4dnbJqpS8x4t9jKEztfTjLKhUVK/gI7LlfqPGaPaZFHLvLFLuwlH/K9thYW24 qBe2oZlnB3y4wj3TlCoJojSJ7qVtPxKULDNFsuniORoon4l9ax+0mc/m5xVKSfg+Q1Sl oe/T9jvtrQYAxswFtHcxR7LAgoyFNNcvdbkJDt5TpfIS0ygphWFP+pUjhBjN+AQ8SfQL D4uw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712849493; x=1713454293; 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=vF7rljSyWSXVyabtJWrttCeWBftBj9OG2VAhwMADVj4=; b=XPxr9HjCEL+BRndQKIJ98f6Djwo881UIRJfAUvl24c1g2odS5BnlWvEk8glOhB/Mq8 WPXH7V85P+I4x7KyTrkqe8dYkHqVOA9fXpZt9KPooXECGxJdGPO5M3DSCyJi1nBl5uyF N9F1jf/gUpe0CuyX2EDknKRu7dxqlIbh7X/EiJsGMyJC0XmMjsVEF94X81eZ95hZCuPA yWKuXYUslTLuiu1UPCZpXGMKtwtonrGnGnAxuja1AwQb2Fq0VuIcZQ0jZTuojL2EskgN 1YXJ7UD4Mv5TFHpArM96OyAtJfWU8Ew5ihyEzkW+/4li9nudf6YATsV/bV+W2c0JiNG0 Djqw== X-Gm-Message-State: AOJu0Yz/wQdPoptGEBYdPtzg49yNbYSn0MCtPiQhTl4oSVpGPLWUyVCy x+v+4zpp899r6oBgXdieh1QfHjLWPA5vPTcfJYd8ayhSxyF8Q9dc/6ip0qXFCMolQYpKObKF6Tn 6 X-Google-Smtp-Source: AGHT+IHL07y7tk9NAT2xCfJWz8ws6u5vrK5l9/JHjQwJXCuH/jjbMnQXq3p3+2diesUY/1sdOfA4yQ== X-Received: by 2002:a6b:4e14:0:b0:7d6:631d:7b0 with SMTP id c20-20020a6b4e14000000b007d6631d07b0mr170561iob.1.1712849493038; Thu, 11 Apr 2024 08:31:33 -0700 (PDT) Received: from localhost.localdomain ([96.43.243.2]) by smtp.gmail.com with ESMTPSA id jc25-20020a056638891900b0047f14b7f6c0sm457056jab.5.2024.04.11.08.31.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Apr 2024 08:31:30 -0700 (PDT) From: Jens Axboe To: linux-kernel@vger.kernel.org Cc: Jens Axboe Subject: [PATCH 003/437] fs: add helpers for defining read/write iterator helpers Date: Thu, 11 Apr 2024 09:12:23 -0600 Message-ID: <20240411153126.16201-4-axboe@kernel.dk> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240411153126.16201-1-axboe@kernel.dk> References: <20240411153126.16201-1-axboe@kernel.dk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" To ease conversion for drivers, add helpers that allow a driver to simply wrap their existing read/write file_operations hook and turn it into one that is appropriate for ->read_iter() or ->write_iter(). Signed-off-by: Jens Axboe --- include/linux/fs.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/fs.h b/include/linux/fs.h index fd862985a309..72de0b1d5647 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2141,6 +2141,22 @@ extern loff_t vfs_dedupe_file_range_one(struct file = *src_file, loff_t src_pos, struct file *dst_file, loff_t dst_pos, loff_t len, unsigned int remap_flags); =20 +/* + * Drivers can use these to ease transition to using ->read_iter() instead + * of ->read(), and ->write_iter() instead of ->write(). Ideally these will + * go away one day. + */ +#define FOPS_READ_ITER_HELPER(name) \ +static ssize_t name## _iter(struct kiocb *iocb, struct iov_iter *to) \ +{ \ + return vfs_read_iter(iocb, to, name); \ +} +#define FOPS_WRITE_ITER_HELPER(name) \ +static ssize_t name## _iter(struct kiocb *iocb, struct iov_iter *from) \ +{ \ + return vfs_write_iter(iocb, from, name); \ +} + /** * enum freeze_holder - holder of the freeze * @FREEZE_HOLDER_KERNEL: kernel wants to freeze or thaw filesystem --=20 2.43.0