From patchwork Thu Nov 14 15:25:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Axboe X-Patchwork-Id: 13875240 Received: from mail-oa1-f42.google.com (mail-oa1-f42.google.com [209.85.160.42]) (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 7C78C1AF0C6 for ; Thu, 14 Nov 2024 15:28:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731598105; cv=none; b=M6zz0jPMN28cHKh9o+Bj5VBQfESVqPvlHhfd51tkxR8DSxLZmiwYC49AzMGjJQfl4cwnQjyABkihBoIuCg10Kb55ZyYad2rRUL7wvWWrUFGhfQmc6e9o14G7lHpQIyDmAc2hSWHMMNQY5CxB0XijEWzY9SzbzXM9weY3cINUsig= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731598105; c=relaxed/simple; bh=4XXew23gq3OoMMOZOjmCtGgMeRxntUp+Fg61kUdG93Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LeGrU9SH6mj9kEJmSnLP8JYaq3vhYsepzpppC3jNSWqNow8izTx+bZ19qmmUclUDnMgj3neRpgr14Wdso6bKE3iGDtk89P1CHPZmHn9BYBXfS/hi3uaoANa3NwHWVzxg9nESZN6i2HOg1V1euCZ+7JiQRJNoYu4HbZqCqnXDS9o= 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=rR9DGWuk; arc=none smtp.client-ip=209.85.160.42 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="rR9DGWuk" Received: by mail-oa1-f42.google.com with SMTP id 586e51a60fabf-295eb32566dso458107fac.1 for ; Thu, 14 Nov 2024 07:28:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20230601.gappssmtp.com; s=20230601; t=1731598101; x=1732202901; 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=JnydZ5ahnoTDPrjopxRhuD9AlpgfRxt1ZJ34FZKhxI0=; b=rR9DGWuknEzGNqxGZH8Mcf0el13yrZ8xjZUBdN2I07qYtdGuKwk4Swbs+uU4K5pFuD GDj+muRTfHfnOkFG+a5VLKPByoEelfPv4ch4QaA1TOviM3IXSVId0fAd4+foDltKO9HR v/izHstC3jCHfbc0gbMDAeOBCBaMaXBZ+CD987zHFcNm2f9qJxhXsNYUIizvt+oWGjxC OKiJGwLBqrOfmwAPv9tDY82rPiK1HjH/PPkL45+Wl6MOPvAdxuI/rnnTGVDgtbGT2iov F0fSvTrNi3gfhu44gZrTR4SRFx/a7uwtINZpmAvRau03e8esVC7cXBSPuuAahtXvS0+u DCkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731598101; x=1732202901; 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=JnydZ5ahnoTDPrjopxRhuD9AlpgfRxt1ZJ34FZKhxI0=; b=cbKMKFBL2aysyB0f+rlziPiJjtAZ+KDxxIv6eZ1cqLV3QSWGZPwEGLHdpioiFGXTJl ZuHJVtsfNTp01w5hZm9bFvrBez8scw8AYvHD0Vc7crFyWjQBlDDj9jWlyBIaMMqJeJqA R2gmCsamhmuWgcb8wAYot5mx5TcKBCNHXt+Hc/ssNVL83zN5+NWkRD8z2YGuQfH2ShKL nvh39DKmetNWOhZvDuk42Pz91mKE0/PvL19Eaq/Hd5PxhYIaR9TCd/blzANhq4Bf3hLb /j6zh21InDWXgaf5AQP76yMIWub068Sqm3p6uTFkJtAU72aSmsJ/JYSbyBbHjc4Sk8ZM Shuw== X-Forwarded-Encrypted: i=1; AJvYcCVx6czKANjhGVm8UZIOZD7/N5hVB2K9abM+EwhNV2b2p2KbnbhZUyzd0ShAqB2GBQ0j7m3s03O3fwI=@vger.kernel.org X-Gm-Message-State: AOJu0YyUc/IDm1DBOMab0TLwxXnT6ppWPIDF0+AaN1dYAGYf/cvuKWKk UicW3VnrTYhcyy6eefJLHLgkrUS/LBWqONSQpX9sOwHhbG0T0LtJxb1Xkpe7Wig= X-Google-Smtp-Source: AGHT+IGNabSsCKonQoe8b+3leqigUS1MxYLou4wkGKabmMMQ9sy0zqR8b1138Alaw/M4bLorq8cnFg== X-Received: by 2002:a05:6870:e2d5:b0:288:2fb6:a385 with SMTP id 586e51a60fabf-295600dc985mr21855599fac.20.1731598101550; Thu, 14 Nov 2024 07:28:21 -0800 (PST) Received: from localhost.localdomain ([96.43.243.2]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-5eea026eb41sm368250eaf.39.2024.11.14.07.28.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Nov 2024 07:28:20 -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, kirill@shutemov.name, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, bfoster@redhat.com, Jens Axboe Subject: [PATCH 14/17] iomap: make buffered writes work with RWF_UNCACHED Date: Thu, 14 Nov 2024 08:25:18 -0700 Message-ID: <20241114152743.2381672-16-axboe@kernel.dk> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241114152743.2381672-2-axboe@kernel.dk> References: <20241114152743.2381672-2-axboe@kernel.dk> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add iomap buffered write support for RWF_UNCACHED. If RWF_UNCACHED is set for a write, mark the folios being written as uncached. 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 | 8 +++++++- 2 files changed, 20 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) if (iter->flags & IOMAP_NOWAIT) fgp |= FGP_NOWAIT; + if (iter->flags & IOMAP_UNCACHED) + fgp |= FGP_UNCACHED; fgp |= fgf_set_order(len); 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 = iocb->ki_filp->f_mapping; struct iomap_iter iter = { - .inode = iocb->ki_filp->f_mapping->host, + .inode = mapping->host, .pos = iocb->ki_pos, .len = iov_iter_count(i), .flags = IOMAP_WRITE, @@ -1034,9 +1037,14 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i, if (iocb->ki_flags & IOCB_NOWAIT) iter.flags |= IOMAP_NOWAIT; + if (iocb->ki_flags & IOCB_UNCACHED) + iter.flags |= IOMAP_UNCACHED; - while ((ret = iomap_iter(&iter, ops)) > 0) + while ((ret = iomap_iter(&iter, ops)) > 0) { + if (iocb->ki_flags & IOCB_UNCACHED) + iter.iomap.flags |= IOMAP_F_UNCACHED; iter.processed = iomap_write_iter(&iter, i); + } if (unlikely(iter.pos == iocb->ki_pos)) return ret; @@ -1770,6 +1778,9 @@ static int iomap_add_to_ioend(struct iomap_writepage_ctx *wpc, size_t poff = offset_in_folio(folio, pos); int error; + if (folio_test_uncached(folio)) + wpc->iomap.flags |= IOMAP_F_UNCACHED; + if (!wpc->ioend || !iomap_can_add_to_ioend(wpc, pos)) { new_ioend: error = iomap_submit_ioend(wpc, 0); diff --git a/include/linux/iomap.h b/include/linux/iomap.h index f61407e3b121..0a88043676f2 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -74,9 +74,14 @@ struct vm_fault; * IOMAP_F_STALE indicates that the iomap is not valid any longer and the file * range it covers needs to be remapped by the high level before the operation * can proceed. + * + * IOMAP_F_UNCACHED is set to indicate that writes to the page cache (and + * hence writeback) will result in folios being evicted as soon as the + * updated bytes are written back to the storage. */ #define IOMAP_F_SIZE_CHANGED (1U << 8) #define IOMAP_F_STALE (1U << 9) +#define IOMAP_F_UNCACHED (1U << 10) /* * Flags from 0x1000 up are for file system specific usage: @@ -173,8 +178,9 @@ 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 */