From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 00DA33AB5C0 for ; Tue, 12 May 2026 12:36:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778589378; cv=none; b=eMhaIDQfUvbQgdGnfBfx/TaI3yYqjGn1OY1Wd+SKbrxCDVQKM/jMSi6NVx+gsRXLuzShAYp9H4rWnvtMexrqbfSPI5eqgjUAFw1FccjKVxsqX+jCjD3OJhMWEKa+/1uEPx1WdjLTBEti7NUuqPgg9qvknA8T83fModKJeBWG6Yw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778589378; c=relaxed/simple; bh=1kNUWeWN+ykCg/OJUqROcQrPNt64HsFYpSs6E1pXHp8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ptN0h1+bdkOSO6C7LHykiyN9DMPwx+Q3RBTGg52CsRWyQgT3ZLwRnfgzqPqKGp17FwsYeoBkGbly4IeBymqxtQ1oe2JBTctBv4ghQrJTzarjI75y3IbLYHKfXqGVbvZDfTUZaEEetcStd27MTMmRhBaNolu75+ZKwyy4kt2fEIM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=JTclZaNo; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="JTclZaNo" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1778589363; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UKJIJgGRVCiWeJXzVXVwYgNOYUcH+tddDbLra7bwmdo=; b=JTclZaNoIr05A+bbhzsMGh0M+7KH7GX0dt2tBwYeW4YKHZCwYGXq9E+L3TLZ50iIC1o11s z4NKvEOCL4EyEuJD9hGyfe15CwdZKvGwhEDBZQa1kTzj5C4GMfZ5z1yG8+DmaU676AAEhs wV+3bh9+kAz+7EPjqjU+bxVaan3HP7Y= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-669-QZDO5lcAOWa_72c4pTMMRg-1; Tue, 12 May 2026 08:35:58 -0400 X-MC-Unique: QZDO5lcAOWa_72c4pTMMRg-1 X-Mimecast-MFC-AGG-ID: QZDO5lcAOWa_72c4pTMMRg_1778589356 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A200519560A2; Tue, 12 May 2026 12:35:56 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.48.83]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 8F2AE1803A94; Tue, 12 May 2026 12:35:53 +0000 (UTC) From: David Howells To: Christian Brauner Cc: David Howells , Paulo Alcantara , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Matthew Wilcox Subject: [PATCH v6 22/24] netfs: Fix netfs_read_folio() to wait on writeback Date: Tue, 12 May 2026 13:33:59 +0100 Message-ID: <20260512123404.719402-23-dhowells@redhat.com> In-Reply-To: <20260512123404.719402-1-dhowells@redhat.com> References: <20260512123404.719402-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Fix netfs_read_folio() to wait for an ongoing writeback to complete so that it can trust the dirty flag and whatever is attached to folio->private (folio->private may get cleaned up by the collector before it clears the writeback flag). Fixes: ee4cdf7ba857 ("netfs: Speed up buffered reading") Closes: https://sashiko.dev/#/patchset/20260414082004.3756080-1-dhowells%40redhat.com Signed-off-by: David Howells cc: Paulo Alcantara cc: Matthew Wilcox cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/netfs/buffered_read.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c index 83d0b8153e96..76d0f6a29aba 100644 --- a/fs/netfs/buffered_read.c +++ b/fs/netfs/buffered_read.c @@ -503,6 +503,8 @@ int netfs_read_folio(struct file *file, struct folio *folio) struct netfs_inode *ctx = netfs_inode(mapping->host); int ret; + folio_wait_writeback(folio); + if (folio_test_dirty(folio)) return netfs_read_gaps(file, folio);