From nobody Wed Dec 17 12:17:02 2025 Received: from mail-pl1-f169.google.com (mail-pl1-f169.google.com [209.85.214.169]) (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 3C00515DBBA for ; Sun, 10 Nov 2024 15:29:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.169 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731252574; cv=none; b=DRXH3ZVmYnWGgvU7kFGaEckf0yH59hSLWySraKVTHRNfxwK21ceUWtkex5Z7fg8y20x+aRAF5gxRG1ILNNyLeFCFJAdbVU5ansuz3nf4vqif77jMdK3cG1g6BXkGVUvmZJPnzQn7nRVOcsE8sbq5sBNEAOlmDdAJm082axty7PY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731252574; c=relaxed/simple; bh=3H9STUASulXCHklYsN+md87lfFFsAKUuDScGACrWthk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sCFnR60y2WEKAUUdrPqqHhb3jo0biFDZfZgQe70AqdFjs6KM4u29fcAIlavGCbN27gR1B4i6KsSIBvFg250mWGLgaMDCYYRPxQi12bbp+CRxkUZYRFJTT/6+da+hqrvVvJXZMTAmFl3pcFjio7N2UcGw6uL1OfNRx6WDnhiVqz0= 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=OI/Ky1or; arc=none smtp.client-ip=209.85.214.169 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="OI/Ky1or" Received: by mail-pl1-f169.google.com with SMTP id d9443c01a7336-20c77459558so34302035ad.0 for ; Sun, 10 Nov 2024 07:29:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20230601.gappssmtp.com; s=20230601; t=1731252572; x=1731857372; 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=QHHnA1NsQjr1van9cnJ+PQRWRXhY+a6ETIPA3kXFfjk=; b=OI/Ky1orJg/GBr9s+FgVuIuEalVhEHGaXMQuHn25NW3gIZ/Ttc5S3RVPzHrSyU1a45 8/H0FAdjTx8OKHd5zHDluKqXO/cxBAALgmb3ngFG1S8q0graYRHyAmyWEt3Lx54pNApI L+XinvPTxzVdMyVeTKk6LIjENaoxTWyyzkf8hIPn/zIM+UH83uvkWvkgZ0AXzGwy6DYf XTGRA1vNNwlqd9zamy/7e5Fmyl39evdcvNE817XPskBp+vQPfxQo7uI71i5KOhOWuTkp a8y6r8F3Y2HpuICeeC2zA9uWMN9Pr4vEMBvhy4KV/8mVrR5mvaPWkvQUcNKb2OvPwg8E QmNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731252572; x=1731857372; 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=QHHnA1NsQjr1van9cnJ+PQRWRXhY+a6ETIPA3kXFfjk=; b=KD+K3+WXybowbdboXCddSwr3OK3CySFAkceGWGnYW9GcVZcSEEoee5UFlLl/U4d7M+ KvCcFaDmcaxuyW7KO9zLMGXE0W16nSHR2ppn540HD65CkXug8iswor5CoRFhplmNJkRD caxFy+2x1It+a31+jXoAutDXlngBJxIXbLHJwlS8ECylBsECMwOmv2UXj+uRu2xYSLNf uBRIwY/XLEDALyVW/lcneUmgQd99ixXCpmJZL0p572IjVYuh/Qah/tEiz0fii3SHZ84C DlgAIKHR1pYiHfWTML4td/1cBq6PW9f6EbtmTKcam+eXQ0UXtUupAz54cvh6zNqM9Muk QKrw== X-Forwarded-Encrypted: i=1; AJvYcCUBjrCJjx/z+TnUqy/zlI5LqwkKJxKqz0TDix88gRsVDy1L6pDhaIxa57SGX8WdJ8EJYRrU+gm1g0PcSr8=@vger.kernel.org X-Gm-Message-State: AOJu0YyIsZ4zFN4RyPWtfWkWftcOw7KKaH375ALK5iUkzgw2uT3G0g8f ghZE8QUdrKpbwLm+8lljrfHMjE3J0e5YXABFoAsJzNNcq5YOwbnKR5SrtEPyhBLV0CVQUCE1yQ/ wt8I= X-Google-Smtp-Source: AGHT+IHV0wAiD3bQchKcabbTvXh2pU9AbMQUOshna304t+XB0bKs6GgV7ufQgRJwzKJwVoPNWeBA0A== X-Received: by 2002:a17:90a:e7c1:b0:2da:9115:15ce with SMTP id 98e67ed59e1d1-2e9b1682714mr12810753a91.15.1731252572603; Sun, 10 Nov 2024 07:29:32 -0800 (PST) Received: from localhost.localdomain ([198.8.77.157]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e99a5f935dsm9940973a91.35.2024.11.10.07.29.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 Nov 2024 07:29:31 -0800 (PST) From: Jens Axboe To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Cc: hannes@cmpxchg.org, clm@meta.com, linux-kernel@vger.kernel.org, willy@infradead.org, Jens Axboe Subject: [PATCH 13/15] iomap: make buffered writes work with RWF_UNCACHED Date: Sun, 10 Nov 2024 08:28:05 -0700 Message-ID: <20241110152906.1747545-14-axboe@kernel.dk> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241110152906.1747545-1-axboe@kernel.dk> References: <20241110152906.1747545-1-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" Add iomap buffered write support for RWF_UNCACHED. If RWF_UNCACHED is set for a write, mark the folios being written with drop_writeback. Then writeback completion will drop the pages. The write_iter handler simply kicks off writeback for the pages, and writeback completion will take care of the rest. This still needs the user of the iomap buffered write helpers to call iocb_uncached_write() upon successful issue of the writes. Signed-off-by: Jens Axboe --- fs/iomap/buffered-io.c | 15 +++++++++++++-- include/linux/iomap.h | 4 +++- 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index ef0b68bccbb6..2f2a5db04a68 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -603,6 +603,8 @@ struct folio *iomap_get_folio(struct iomap_iter *iter, = loff_t pos, size_t len) =20 if (iter->flags & IOMAP_NOWAIT) fgp |=3D FGP_NOWAIT; + if (iter->flags & IOMAP_UNCACHED) + fgp |=3D FGP_UNCACHED; fgp |=3D fgf_set_order(len); =20 return __filemap_get_folio(iter->inode->i_mapping, pos >> PAGE_SHIFT, @@ -1023,8 +1025,9 @@ ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i, const struct iomap_ops *ops, void *private) { + struct address_space *mapping =3D iocb->ki_filp->f_mapping; struct iomap_iter iter =3D { - .inode =3D iocb->ki_filp->f_mapping->host, + .inode =3D mapping->host, .pos =3D iocb->ki_pos, .len =3D iov_iter_count(i), .flags =3D IOMAP_WRITE, @@ -1034,9 +1037,14 @@ iomap_file_buffered_write(struct kiocb *iocb, struct= iov_iter *i, =20 if (iocb->ki_flags & IOCB_NOWAIT) iter.flags |=3D IOMAP_NOWAIT; + if (iocb->ki_flags & IOCB_UNCACHED) + iter.flags |=3D IOMAP_UNCACHED; =20 - while ((ret =3D iomap_iter(&iter, ops)) > 0) + while ((ret =3D iomap_iter(&iter, ops)) > 0) { + if (iocb->ki_flags & IOCB_UNCACHED) + iter.iomap.flags |=3D IOMAP_F_UNCACHED; iter.processed =3D iomap_write_iter(&iter, i); + } =20 if (unlikely(iter.pos =3D=3D iocb->ki_pos)) return ret; @@ -1770,6 +1778,9 @@ static int iomap_add_to_ioend(struct iomap_writepage_= ctx *wpc, size_t poff =3D offset_in_folio(folio, pos); int error; =20 + if (folio_test_uncached(folio)) + wpc->iomap.flags |=3D IOMAP_F_UNCACHED; + if (!wpc->ioend || !iomap_can_add_to_ioend(wpc, pos)) { new_ioend: error =3D iomap_submit_ioend(wpc, 0); diff --git a/include/linux/iomap.h b/include/linux/iomap.h index f61407e3b121..2efc72df19a2 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -64,6 +64,7 @@ struct vm_fault; #define IOMAP_F_BUFFER_HEAD 0 #endif /* CONFIG_BUFFER_HEAD */ #define IOMAP_F_XATTR (1U << 5) +#define IOMAP_F_UNCACHED (1U << 6) =20 /* * Flags set by the core iomap code during operations: @@ -173,8 +174,9 @@ struct iomap_folio_ops { #define IOMAP_NOWAIT (1 << 5) /* do not block */ #define IOMAP_OVERWRITE_ONLY (1 << 6) /* only pure overwrites allowed */ #define IOMAP_UNSHARE (1 << 7) /* unshare_file_range */ +#define IOMAP_UNCACHED (1 << 8) /* uncached IO */ #ifdef CONFIG_FS_DAX -#define IOMAP_DAX (1 << 8) /* DAX mapping */ +#define IOMAP_DAX (1 << 9) /* DAX mapping */ #else #define IOMAP_DAX 0 #endif /* CONFIG_FS_DAX */ --=20 2.45.2